EP3088097B1 - Devices and method for the pressure forming of connector bridges between parts of a board-shaped workpiece - Google Patents
Devices and method for the pressure forming of connector bridges between parts of a board-shaped workpiece Download PDFInfo
- Publication number
- EP3088097B1 EP3088097B1 EP15165676.6A EP15165676A EP3088097B1 EP 3088097 B1 EP3088097 B1 EP 3088097B1 EP 15165676 A EP15165676 A EP 15165676A EP 3088097 B1 EP3088097 B1 EP 3088097B1
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- forming
- tool
- workpiece
- stroke
- tool part
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- 238000000034 method Methods 0.000 title claims description 31
- 239000002184 metal Substances 0.000 claims description 76
- 238000012545 processing Methods 0.000 claims description 58
- 239000000463 material Substances 0.000 claims description 16
- 238000000926 separation method Methods 0.000 claims description 9
- 238000011156 evaluation Methods 0.000 claims description 8
- 210000000056 organ Anatomy 0.000 claims description 7
- 238000003754 machining Methods 0.000 description 50
- 238000007493 shaping process Methods 0.000 description 44
- 238000003698 laser cutting Methods 0.000 description 9
- 230000001419 dependent effect Effects 0.000 description 8
- 238000005520 cutting process Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000004080 punching Methods 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- 238000013459 approach Methods 0.000 description 3
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/10—Incompletely punching in such a manner that the parts are still coherent with the work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/16—Shoulder or burr prevention, e.g. fine-blanking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/24—Perforating, i.e. punching holes
- B21D28/34—Perforating tools; Die holders
Definitions
- the invention also relates to a method for pressure forming a connecting web of the type mentioned carried out by means of the above forming tool and / or by means of the above machine tool.
- the previously known forming tool comprises a forming die with a bevelled punch tip and a forming die with a bearing surface and a die recess embedded in the bearing surface.
- the forming die is one, the forming die assigned to the other side of a connecting bridge to be processed.
- the forming punch is moved in the direction of the forming die with a machining stroke carried out along a stroke axis.
- the shaping stamp acts on the connecting web arranged between the shaping stamp and the shaping die with the bevelled stamp tip.
- the connecting web is squeezed while reducing the thickness of the connecting web between the shaping punch and the shaping die, and is also bent over an edge which is formed on the shaping die by the contact surface and a lateral boundary surface of the die recess running parallel to the stroke axis.
- a fracture zone of reduced cross-section is produced on the connecting web compared to the rest of the connecting web.
- a punching tool comprises a punch and a workpiece support, which are arranged on both sides of a workpiece to be machined.
- the punch has a raised peripheral edge with a triangular cross section.
- the workpiece support is provided with a flat support surface for a workpiece to be machined.
- the raised peripheral edge of the punch faces the flat support surface of the workpiece support.
- a first step the punch is moved along the stroke axis so far in the direction of the support surface of the workpiece support that the raised peripheral edge of the punch penetrates the workpiece in question and creates a V-shaped workpiece groove on the associated workpiece side, but between the raised peripheral edge of the punch on the one hand and the support surface of the workpiece support on the other hand, a residual thickness of the workpiece remains.
- a cutout is created on the workpiece in a subsequent step.
- JP H10 152136 A discloses an apparatus and a method for creating a predetermined breaking point for a ring-pull closure on a tin can.
- a wall area of the tin can supported on a flat support surface of the device, is acted upon on the side remote from the support surface by a cutting edge of a stamp such that a residual thickness of the machined wall of the tin can remains between the cutting edge of the stamp on the one hand and the support surface on the other hand.
- the object of the present invention is to enable a force-dependent control of the pressure conversion of connecting webs of the type described above.
- the forming tool according to the invention enables force-dependent control of the machining stroke of the tool parts of the forming tool.
- Mutual support of the tool parts effective along the stroke axis, bypassing the pressure-formed connecting web, is realized in that the first tool part has a portal-like shape and overlaps the connecting web to be formed during its processing.
- the portal supports of the first tool part are in the stroke end position of the two tool parts on the second tool part on the side next to the connecting web.
- the shaping element is arranged on the first tool part, which is designed like a portal, between the portal supports.
- a forming tool which, in addition to a first tool part provided with a forming element, comprises a second tool part which is provided with a continuously flat bearing surface and is consequently of simple design.
- the second tool part there is the possibility of to execute the second tool part as a disk-shaped component with a low overall height along the stroke axis of the forming tool.
- forming elements that are rigidly connected to the rest of the tool part are suitable, but also forming elements that are rotatably mounted on a base body of the first tool part and can consequently roll on the connecting web for pressure forming.
- the connecting web After the pressure forming of a connecting web, the connecting web only has a relatively small cross section, which is dimensioned such that the connection of the connecting web to the adjacent workpiece part can be released with little effort, for example by moving the machined workpiece back and forth. Regardless of this, the connecting web can be dimensioned before the pressure forming in such a way that it creates a load-bearing connection between the relevant workpiece parts.
- good parts can also be connected to one another or one or more good parts with a waste part, for example with a scrap skeleton, by connecting webs.
- the connecting webs can start, for example, at straight or curved edges, but also at corners of the workpiece parts connected to one another.
- the connecting webs should be aligned with the forming member of the first tool part in such a way that the connecting webs face the forming member along the stroke axis with surfaces and not with edges.
- material particles which are produced, for example, as chips when pressure-forming a connecting web can be removed from the processing point.
- the invention is in a preferred embodiment Provide at least one of the tool parts of the forming tool according to the invention with a corresponding suction. The removal of material particles from the processing point also prevents the material particles from leaving traces on the workpiece parts connected to one another via connecting webs and thereby reducing the quality of the workpiece processing.
- the machining stroke to be carried out for pressure forming a connecting web is controlled as a function of force.
- the tool parts of the forming tool according to the invention are arranged in tool holders, which are provided on opposite sides of the connecting web to be formed or the workpiece parts connected to one another by the connecting web to be formed, and which can be moved numerically controlled relative to one another along the stroke axis of the tool parts. There may also be the option of rotating the tool holders together with the tool parts attached to them about the stroke axis. Because of the geometry of the second tool part of the shaping tool according to the invention, however, it is generally not necessary to turn the tool holder in which the tool part provided with the continuously flat contact surface is accommodated.
- the previously machined workpiece usually rests on a conventional workpiece support of the machine tool.
- the connecting webs are positioned for processing relative to the tool parts of the forming tool held in the tool holders.
- a connecting web to be formed is pressurized on the one hand by the forming member of the first tool part and on the other hand is supported on the contact surface of the second tool part serving as an abutment for the first tool part.
- the line, along which the forming element of the first tool part dips into the connecting web can, for example, extend an extension of a separating surface that was created on the adjacent workpiece part when the connecting web was created, but it can also be placed upstream of this separating surface or opposite the separating surface into the interior of the Part of the workpiece must be set back.
- the forming element of the first tool part may overlap with a workpiece part, preferably in the order of tenths of a millimeter.
- the tool parts of the forming tool according to the invention perform a single machining stroke or several successive machining strokes relative to one another for shaping a connecting web.
- the forming method according to the invention is part of the cutting method according to the invention and also part of the machining method according to the invention, in the course of which the cutting method according to the invention and additionally a further workpiece machining are carried out.
- the forming tool according to the invention can be used to reshape the connecting bridge or bridges in a manner which is matched to the workpiece machining provided in addition to the separating machining.
- the connecting web (s) are formed on a workpiece part, to produce geometries such as those produced in the course of the additional workpiece machining on the remaining parting surface of the workpiece part in question.
- a parting surface is created on the workpiece side by the forming member. This circumstance is particularly important when the shaping element of the first tool part attaches to one end of the connecting web in question and consequently in the immediate vicinity of a workpiece part.
- the condition of the separating surface created by the forming member can be influenced. If the forming element has a sharp edge at the transition between its workpiece side and the free end of the first tool part, it creates a smooth and thus high-quality separating surface.
- the forming member of the first tool part on a workpiece side runs along the lifting axis parallel to the parting surface or at an angle with respect to the parting surface on the part of the workpiece which the workpiece side of the forming member faces during pressure forming of the connecting web. If the workpiece side of the forming member is parallel to the separating surface on the relevant workpiece part, then the separating surface created by means of the forming member on the relevant workpiece part also runs parallel to the separating surface of the workpiece part created prior to the pressure forming of the connecting web.
- a parting surface running parallel to the parting surface on the workpiece part in question is produced according to the invention in particular when the parting surface created by means of the forming part extends the existing parting surface on the part of the workpiece.
- the creation of a parting surface inclined at an angle to the already existing parting surface of the workpiece part by means of the shaping element is provided according to the invention, for example, in cases where before or after the shaping of the connecting web the parting surface already present on the workpiece part is reshaped by additional edge processing of the part and thereby beveled becomes.
- the inclined surface created on the workpiece by means of the forming member is aligned with the inclined surface which is created as part of the additional edge processing of the workpiece part.
- the first tool part in a preferred embodiment of the invention is designed as a tapering tool part, the shaping member of the first tool part tapering along the stroke axis towards the free end of the first tool part.
- This type of forming tool according to the invention is advantageous in particular with regard to the forming force to be applied for the pressure forming of a connecting web.
- a forming surface is provided on a web side of the forming member of the tapering tool part facing away from the workpiece side, which, starting from the free end of the tapering tool part, runs along the stroke axis away from the workpiece side of the forming member and accordingly is inclined to the stroke axis.
- material of the connecting bar is plasticized on the side of the connecting web assigned to the tapering tool part by means of the forming member of the tapering tool part and plasticized material of the connecting bar on the web side of the forming member displaced away from the workpiece side by the forming surface of the forming member.
- the shaping element of the tapering tool part creates a fracture zone at the relevant end of the connecting web due to its special geometry, which is such that after the connecting web has broken, no or only slight traces of the Remaining connecting web on the workpiece part. Because plasticized material of Connecting web, which is generated by the forming member, is displaced away from the workpiece side of the forming member and thus also from the workpiece part adjacent to the connecting web, the plasticized material of the connecting web can leave no or at most slight traces on the workpiece part in question. Burrs formed on the connecting web are removed together with the connecting web in the course of the separating method according to the invention and consequently does not impair the quality of the separating surface on the workpiece part.
- the forming member on the first tool part of the forming tool according to the invention can be different geometries.
- a forming element with a rectangular cross section is conceivable.
- the forming member of a tapered first tool part in a section plane running parallel to the stroke axis has a triangular cross section or a trapezoidal cross section.
- a forming element with a triangular cross section is linear on its end face.
- such a shaping element in a preferred embodiment of the invention can be provided with a slight flattening or rounding at the triangular tip forming the end face of the shaping element.
- a shaping element with a trapezoidal cross section has a flat design on its end face and is consequently less subject to wear during operation than a triangular shaped shaping element in cross section.
- Cross sections deviating from the trapezoidal shape, which form an end face on the shaping element of the tapering tool part are also conceivable according to the invention.
- a forming element with a triangular or with a trapezoidal cross section is provided in a further development of the invention in that the forming element of the tapering tool part is formed by a free end of the tapering tool part provided with an inner cavity, preferably an inner cone (claim 6).
- an inner cavity preferably an inner cone (claim 6).
- a connecting web is formed by pressure, material of the connecting web can flow into the interior of the inner cavity. This reduces the resistance, which one the connecting web opposes the processing by the forming tool according to the invention.
- a radius or a bevel can be provided at the transition between the free end of the tapered tool part and the inner cone.
- the radius and the bevel if necessary, ensure that the reshaped connecting web does not break at this point when the workpiece parts are finally separated, but rather where the reshaping element of the tapering tool part starts with the edge that is at the transition between the workpiece side of the reshaping element and the free end of the tapered tool part is formed.
- Claim 7 relates to a design of the forming tool according to the invention which is provided for this purpose and which permits a connecting web to be formed simultaneously at a plurality of locations spaced apart along the connecting web and thereby weakened for the complete separation of the workpiece parts connected to one another via the connecting web.
- Each of the forming points on the connecting web is processed by an organ section of the forming element provided on the first tool part.
- the forming member of the first tool part in a preferred embodiment of the invention extends in a circumferential direction and in particular in an arc shape, preferably along an arc, around the stroke axis.
- the extent of the shaping element in the circumferential direction can be dimensioned such that the shaping element acts simultaneously on several points of the connecting bar when a connecting bar is being shaped.
- An arcuate, in particular a circular course of the forming member offers the possibility of arranging the fracture zone, at which the connecting web is to break after the forming, on the workpiece part adjoining the connecting web in an area which is set back into the interior of the workpiece part compared to the parting surface already created on this workpiece part before the forming of the connecting web.
- a circular course of the forming member is also advantageous in that, by simply rotating the first tool part about a positioning axis concentric with the forming member, different organ sections of the forming member can be assigned to one and the same processing point and / or one and the same organ section to different processing points.
- the successive use of different organ sections of the forming element is particularly recommended due to the associated leveling of tool wear.
- the forming member of the first tool part is endless in the circumferential direction.
- a shaping element segmented in the circumferential direction is also conceivable.
- claim 15 provides that when machining a plate-like workpiece made of an elastically deformable material, the at least one connecting web is created as a solid-state joint and is resilient in the transverse direction of the separating surfaces of the workpiece parts connected to one another by the connecting web. If such a connecting web is formed by means of the shaping tool according to the invention, the connecting web can be compressed using its elasticity. Consequently, only a relatively small force is to be used to reshape the connecting web. This applies in particular in cases in which a connecting web is pressure-formed at both ends at the same time.
- FIG. 1 is a machine tool 1 designed as a punch laser combination machine.
- a machine frame 2 of the machine tool 1 has a C-shape and has an upper frame leg 3 and a lower frame leg 4.
- a laser cutting station 5 and a forming station 6 are provided at the free ends of the upper frame leg 3 and the lower frame leg 4.
- the laser cutting station 5 comprises a laser cutting head 7 on the upper frame arm 3 and a laser beam holder 8 on the lower frame arm 4.
- the forming station 6 has an upper tool holder 9 on the upper frame arm 3 and a lower tool holder 10 on the lower frame arm 4.
- An upper tool designed as a forming die 11 is inserted into the upper tool holder 9 as a first tool part, and a lower tool of a forming tool 13 designed as a forming die 12 is inserted into the lower tool holder 10 as a second tool part.
- the forming die 11 can be moved along a lifting axis 14 relative to the forming die 12 be raised and lowered.
- the upper tool holder 9 and the lower tool holder 10 can be rotated together with the forming die 11 and the forming die 12 about the lifting axis 14 (double arrow in FIG Figure 1 ). All functions of the machine tool 1 are controlled by a programmable numerical control.
- a sheet 15 are processed.
- the sheet 15 is moved by means of a conventional coordinate guide 16 with a two-axis horizontal movement over a workpiece support 17 of the machine tool 1 and thereby relative to the laser cutting head 7 and the laser beam holder 8 and also relative to the forming tool 13.
- Figure 1 the sheet 15 is shown broken off.
- the laser beam receptacle 8 and the lower tool receptacle 10 with the forming die 12 of the forming tool 13 can be seen in FIG. 1.
- the sheet 15 is first machined separately at the laser cutting station 5.
- a possible result of the separating processing of the sheet 15 is shown in Figure 2 shown.
- a laser beam directed by the laser cutting head 7 onto the sheet 15 cuts the sheet metal parts 19, 20, 21, 22 free while leaving connecting webs 23 free.
- the residual grid 18 and the sheet metal parts 19, 20, 21, 22 are only incompletely separated from one another.
- a different type of cutting tool in particular a punching tool that is inserted at the forming station 6, could also be used to incompletely separate the residual grid 18 and the sheet metal parts 19, 20, 21, 22.
- the sheet 15 is moved by means of the coordinate guide 16 to the forming station 6 of the machine tool 1.
- the connecting webs 23 are pressure-formed by means of the forming tool 13, which is inserted into the upper tool holder 9 and the lower tool holder 10.
- the forming tool 13 with the forming punch 11 provided as the upper tool and the forming die 12 provided as the lower tool and essentially cylindrical in the example shown is in Figure 3 shown.
- the forming die 11 has an axial end section which is designed as a forming member 24.
- the forming member 24 forms the free end of the forming die 11. How Figure 5 shows, the forming member 24 tapers along the stroke axis 14 to the free end of the forming die 11.
- the forming die 11 is consequently a tapered tool part of the forming tool 13.
- the axially parallel outer lateral surface of the forming die 11 and the end face 26 of the stamp-side forming member 24 form a sharp edge, which creates a smooth parting surface when the forming punch 11 is immersed in a connecting web 23 to be formed.
- the shaping member 24 has a trapezoidal cross section.
- the upper limit of the trapezoidal cross section of the forming member 24 is in Figure 5 indicated by an imaginary dashed line.
- the forming member 24 runs endlessly and concentrically with the stroke axis 14.
- a continuously flat bearing surface 27 is provided on the forming die 12. If the forming tool 13 with the forming die 11 is inserted into the upper tool holder 9 and with the forming die 12 into the lower tool holder 10 of the machine tool 1, the bearing surface 27 of the forming die 12 lies opposite the end face 26 of the die-side forming member 24 along the stroke axis 14. Both the support surface 27 of the forming die 12 and the end face 26 of the stamp-side forming member 24 extend perpendicular to the stroke axis 14.
- the processed sheet metal 15 is positioned by means of the coordinate guide 16 of the machine tool 1 relative to the forming tool 13 that is inserted at the forming station 6 such that the forming tool 13 is in a standby position for machining relative to the connecting web 23 to be formed.
- the forming punch 11 of the forming tool 13 is spaced along the stroke axis 14 from the top of the connecting web 23 and the workpiece parts adjacent to it.
- the support surface 27 of the forming die 12 has a minimal distance along the stroke axis 14 from the underside of the connecting web 23 and the workpiece parts connected by it.
- the forming die 11 is moved with a machining stroke along the stroke axis 14 in the direction of the forming die 12 to an end stroke position.
- the machining stroke is controlled depending on the path
- the machining stroke is controlled depending on the force.
- the amount of the machining stroke carried out by the forming die 11 relative to the forming die 12 is variably adjustable and depends in particular on the desired remaining thickness of the connecting web 23 after the forming.
- the path covered by the forming die 11 along the stroke axis 14 is recorded by means of a conventional path measuring system and forms the basis for controlling the stroke drive of the machine tool 1.
- the forming die 11 is immersed in the course of the machining stroke with diametrically opposed organ sections of the forming member 24 at both ends of the connecting web 23 in this and in the adjacent regions of the remaining grid 18 and the sheet metal part 20.
- a workpiece side 29 of the forming member 24 faces the residual grid 18, a workpiece side 30 of the forming member 24 faces the sheet metal part 20.
- Web sides 31, 32 of the shaping element 24 point to the connecting web 23 and are accordingly facing away from the residual mesh 18 and the sheet metal part 20.
- the workpiece sides 29, 30 of the forming member 24 on the forming die 11 run parallel to the lifting axis 14 and also parallel to a separating surface 33 created in the previous separating processing of the sheet on the residual grid 18 and a corresponding, in Figure 4 hidden separating surface on the sheet metal part 20.
- the shaping element 24 On the web sides 31, 32, the shaping element 24 has shaping surfaces 34, 35.
- the forming surfaces 34, 35 of the forming member 24, starting from the free end of the forming die 11, run along the stroke axis 14 away from the workpiece sides 29, 30 of the forming member 24.
- the cross-section of the connecting web 23 along the stroke axis 14 is reduced by pressure forming by means of the forming tool 13. Due to the excess of the diameter of the end face 26 of the stamp-side shaping element 24 relative to the connecting web 23, the reduced cross-sectional approaches of the connecting web 23 on the residual grille 18 and on the sheet metal part 20 are set back into the interior of the residual grid 18 and the sheet metal part 20 relative to the separating surfaces 33.
- a corresponding offset of the approaches of the cross-section-reduced connecting web 23 on the scrap skeleton 18 and on the sheet metal part 20 occurs when the separating surfaces 33 on the scrap skeleton 18 and the sheet metal part 20 are already in one piece during the separating processing of the sheet metal 15 prior to the pressure forming of the connecting webs 23 appropriate return are provided ( Figure 6 ).
- Figure 6 In this case, in the case of pressure forming following the separating processing of the sheet 15, only the connecting web 23 and not also an area directly adjoining the connecting web 23 is provided to process the remaining grid 18 and the sheet metal part 20. Accordingly, in the case of the processing situation Figure 6 to apply a lower force to the pressure forming of the connecting web 23 than in the conditions according to Figure 4 .
- FIG. 7 illustrates, for example, the processing of X-shaped intersecting processing webs 23, as are shown in FIG Figure 2 are provided between the sheet metal parts 19, 20, 21, 22.
- Figure 7 relates to the case where not only the connecting webs 23 themselves but also immediately adjacent workpiece areas are to be reshaped, while according to Figure 8 Workpiece areas directly adjacent to the connecting webs 23 have already been removed during the previous separating processing of the sheet 15 and consequently only the connecting webs 23 have to be reshaped.
- Figure 9 shows a connecting web 23 provided between two incompletely separated workpiece parts, which, like the rest of the separatively machined workpiece, consists of a resilient material and which was created with a meandering shape in the incomplete separation of the adjacent workpiece parts. Due to the material and because of its special shape, the connecting web 23 is resilient and accordingly forms a solid body joint between the two adjacent workpiece parts. If the connecting web 23 according to Figure 9 in the in Figure 5 illustrated way pressurized by the forming die 11 and the forming die 12 of the forming tool 13, the connecting web 23, due to its spring elasticity, only offers a relatively small resistance to the pressure forming. The spring elasticity of the connecting web 23 facilitates the displacement of plasticized material of the connecting web 23 away from the workpiece sides 29, 30 of the stamping member 24.
- FIGS. 10a, 10b and 10c show structurally different forming tools 13/1, 13/2, 13/3 from the forming tool 13 each in the scope of a forming die 11/1, 11/2, 11/3.
- a forming member 24/1 of the forming die 11/1 unlike the forming member 24 of the forming die 11, has an elliptical shape.
- the forming die 11/2 is divided in a plane parallel to the stroke axis 14 and consequently has a two-part forming member 24/2, each segment of the forming member 24/2 being semicircular.
- the forming die 11/3 has resulted from the forming die 11/1 by division along a plane running parallel to the stroke axis 14.
- a forming member 24/3 of the forming die 11/3 is consequently segmented and comprises two structurally identical halves.
- the forming members 24/1, 24/2, 24/3 of the forming die 11/1, 11/2, 11/3 have the same cross-sectional shape as the forming member 24 of the forming die 11. With the forming die 11/1, 11/2, 11 / 3 is consequently tapered tool parts of the forming tools 13/1, 13/2, 13/3.
- the forming dies 11/1, 11/2, 11/3 are each assigned a forming die 12, as shown in FIG Figure 3 is shown.
- a plurality of processing strokes of the forming tool 13/1 are carried out in succession at the ends of connecting webs 23.
- the forming die 11/1 is rotated by rotating the upper tool holder 9 about the lifting axis 14.
- a rotary setting of the forming die 12 cooperating with the forming die 11/1 is not necessary due to the geometry of the forming die 12.
- the processed sheet metal 15 positioned relative to the forming tool 13/1 by means of the coordinate guide 16 of the machine tool 1.
- a simple connecting web 23 is processed by means of the forming tool 13/2.
- the forming tool 13/3 is used for pressure forming two connecting webs 23 which intersect in an X-shape.
- the forming tools 13/2, 13/3 carry out pressure forming at both ends of a connecting web 23 with a single machining stroke, two successive machining strokes of the shaping tool 13/3 being required for machining the two X-shaped connecting webs and the shaping tool 13 / 3 is rotated about the stroke axis 14 after the first machining stroke.
- Figure 13 shows a first tool part of a forming tool 13/4 designed as a forming die 11/4.
- the forming die 11/4 is also a tapered tool part.
- the forming die 11/4 has a forming member 24/4 which forms a free end of the forming die 11/4 and which tapers along the stroke axis 14 towards the free end of the forming die 11/4.
- the stamping element 24/4 has a triangular cross section.
- An upper horizontal boundary line of the triangular cross section of the forming member 24/4 is in Figure 13 indicated by dashed lines.
- the forming die 11/4 processes a connecting web 23 only at one point in a machining stroke carried out for pressure forming the connecting web 23.
- the forming die 11/4 also acts for the pressure forming of a connecting web 23 with a forming die 12 in FIG Figure 3 shown together.
- FIG 14 the forming die 11/4 with the forming member 24/4 is immersed in the connecting web 23 at the right end of the connecting web 23 in the illustration.
- a workpiece side 36 of the forming member 24/4 running parallel to the lifting axis 14 faces the sheet metal part 20, a web side 37 of the forming member 24/4 faces away from the sheet metal part 20.
- the shaping member 24/4 is provided with a shaping surface 38 on the web side 37. Due to the dimensioning of the machining stroke carried out by the forming die 11/4 along the stroke axis 14, a residual thickness of the connecting web 23 remains when the connecting web 23 is pressure-formed.
- the workpiece side 36 of the forming member 24/4 is in the processing of the in Figure 14 Left end of the connecting web 23 facing the sheet metal part 21, the web side 37 of the forming member 24/4 faces away from the sheet metal part 21. Both during pressure forming of the connecting web 23 at its right end and during the forming of the connecting web 23 at its left end, plasticized material of the connecting web 23 is formed by the forming surface 38 on the web side 37 of the stamp-side forming member 24/4 from the workpiece side 36 of the forming member 24/4 ousted away
- the conditions according to Figure 15 differ from the processing situation accordingly Figure 14 in that the in Figure 14 As the web side 37 provided side of the forming member 24/4 forms a workpiece side 39. Accordingly, in Figure 15 the forming member 24/4 on the workpiece side 39 against the stroke axis 14 and consequently also against one in Figure 15 Separation surface 33 of the sheet metal part 21, not shown, parallel to the stroke axis, is inclined.
- the workpiece side 36 according to Figure 14 forms in Figure 15 a web side 40 parallel to the stroke axis of the forming member 24/4.
- the processing situation differs accordingly Figure 15 from the in Figure 14 conditions shown also by the amount of the machining stroke carried out by the forming die 11/4 along the stroke axis 14.
- the machining stroke of the forming die 11/4 is dimensioned such that only the forming member 24/4, which is triangular in cross section, and not also an adjoining axial section of the forming die 11/4 is immersed in the machined sheet 15.
- Figure 15 the machined sheet 15 is positioned opposite the forming tool 13/4 in such a way that the forming member 24/4 of the forming die 11/4 is arranged on the sheet metal part 21 on both sides of the shoulder of the connecting web 23 in the stroke end position of the forming tool 13 and consequently both Connecting web 23 and the sheet metal part 21 acted upon.
- the forming member 24/4 creates a chamfer on the edge of the sheet metal part 21 on the workpiece side 39 inclined against the stroke axis 14.
- the cross section of the connecting web 23 at the end of the connecting web 23 lying towards the sheet metal part 21 is reduced.
- a forming die 11/4 is shown as the first tool part of a forming tool 13/5.
- a forming member 24/5 of the forming die 11/5 has a rectangular cross section in a section plane running parallel to the stroke axis 14 and accordingly does not taper towards the free end of the forming die 11/5.
- the forming die 11/5 is consequently not a tapering tool part of the forming tool 13/5.
- the forming die 11/5 also acts for the pressure forming of connecting webs 23 with a forming die 12 provided as the second tool part of the forming tool 13/5 Figure 3 together.
- a first tool part of a forming tool 13/6 is designed as a forming die 11/6.
- the forming die 11/6 is a second tool part Figure 17 Forming die 12, not shown, according to Figure 3 assigned.
- a forming unit 41 of the forming die 11/6 coincides with the forming die 11 in accordance with Figure 3 match. Accordingly, the forming die 11/6 is a tapered tool part.
- the forming die 11/6 ends in a forming member 24/6 with a trapezoidal cross section.
- the forming die 11/6 has cheeks 42, 43 which protrude from the forming member 24/6 of the forming die 11/6 along the lifting axis 14 towards the forming die 12, not shown, and thereby protrusions 44, 45 of the forming die 11 / 6 train.
- the previously machined sheet 15 and the forming tool 13/6 are positioned relative to one another in such a way that during a machining stroke carried out from the forming punch 11/6 towards the forming die 12, the connecting web 23 to be formed between the projections 44, 45 of the Forming stamp 11/6 comes to rest.
- the projections 44, 45 of the stamping die 11/6 with their end faces leading along the stroke axis 14 on the contact surface 27 of the forming die 12.
- the protrusion of the projections 44, 45 relative to the shaping element 24/6 of the shaping stamp 11/6 is dimensioned such that when the shaping stamp 11/6 is in the end-of-stroke position, the free end of the shaping element 24/6 on the shaping stamp 11/6 from the support surface 27 the forming die 12 has a distance along the stroke axis 14 which corresponds to the desired residual thickness of the pressure-formed connecting web 23. In the stroke end position, the forming die 11/6 engages over the deformed connecting web 23 in a portal-like manner.
- the projections 44, 45 of the forming die 11/6 are laterally adjacent to the connecting web 23 in the manner of portal supports.
- the machining stroke carried out by the forming die 11/6 relative to the forming die 12 is force-controlled.
- integrated stroke control device 50 for the stroke drive of the forming tool 13/6 is provided.
- the stroke control device 50 comprises a force measuring device 51, an evaluation device 52 and an actuating device 53.
- the force measuring device 51 is used to measure the amount of supporting force with which the forming die 11/6 of the forming tool 13/6 is supported on the forming die 12 along the stroke axis 14.
- the evaluation device 52 the measured actual amount of the support force is compared with a limit amount of the support force stored in the stroke control device 50. If the measured actual amount of the support force reaches the predetermined limit, this indicates that the forming die 11/6 has reached its end-of-stroke position along the stroke axis 14. The evaluation device 52 then generates a switching signal for the actuating device 53.
- the actuating device 53 actuates the lifting drive of the forming tool 13/6 in such a way that the processing stroke of the forming die 11/6 directed towards the forming die 12 ends and starts Return stroke of the forming die 11/6 is initiated in the opposite direction of the machining stroke.
- a forming tool 13/7 is shown with a first tool part in the form of a forming stamp 11/7 and with a forming die 12 as a second tool part.
- Protrusions 46, 47 of the forming die 11/7 protrude along the lifting axis 14 with respect to a forming member 24/7 of the forming die 11/7 toward the forming die 12.
- the forming member 24/7 of the forming die 11/7 is correct in its structural design and in its functioning with the forming member 24/4 of the forming die 11/4 ( Figures 14 , 15 ) match.
- the forming die 11/7 is accordingly designed as a tapered tool part.
- Figure 19 shows a forming tool 13/8 with a first tool part designed as a forming stamp 11/8 and a second tool part designed as a forming die 12.
- a shaping element 24/8 corresponds in structure and operation to the shaping element 24/5 on the shaping punch 11/5 in accordance with Figure 16 . Accordingly, the forming die 11/8 is not a tapered tool part. Adjacent to the forming member 24/8 are projections 48, 49 on the forming die 11/8 along the stroke axis 14 towards the forming die 12.
- the machining stroke of the forming tool 13/7 according to Figure 18 and the machining stroke of the forming tool 13/8 according to Figure 19 are controlled depending on the force.
- the processes in the force-dependent control of the machining stroke of the forming tools 13/7, 13/8 correspond to those described above for the forming tool 11/6 Figure 17 described processes.
- Figure 20 illustrates a method step that is carried out during the processing of the sheet 15 in the illustrated example prior to the pressure forming of the connecting webs 23.
- sheet metal parts are edged on the upper side, which have previously been incompletely separated from one another by separating workpiece machining while leaving resilient connecting webs 23 in place.
- a forming roller 54 is used to carry out the edge processing and is inserted into the upper tool holder 9 at the forming station 6 of the machine tool 1.
- the forming roller 54 acts during the processing of the sheet metal parts of a sheet that has been previously cut with a in Figure 20 Counter-pressure roller, not shown, together, which is inserted into the lower tool holder 10 of the machine tool 1 and which bears against the underside of the machined sheet with a cylindrical outer surface.
- the forming roller 54 is provided with a double-conical bead 55 which has two conical forming surfaces 56, 57.
- the sheet metal parts in the exemplary case according to FIG Figure 2 the sheet metal parts 19, 20, 21, 22 of the processed sheet 15, from the associated residual grid (residual grid 18 in Figure 2 ) solved. Due to the reduction in cross-section of the connecting webs 23, shaking the processed sheet 15 is sufficient for this. As a result of the load acting thereby, the connecting webs 23 break in the fracture zones produced by pressure forming.
- the reduced-diameter projections of the connecting webs 23 are set back into the interior of the sheet metal parts, so that the remains of the connecting webs 23 on the sheet metal parts do not protrude the parting surfaces of the sheet metal parts created before the pressure forming of the connecting webs 23.
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Description
Die Erfindung betrifft ein Umformwerkzeug sowie eine mit einem derartigen Umformwerkzeug versehene Werkzeugmaschine zum Druckumformen eines Verbindungsstegs, der an seinen Enden an Werkstückteilen ansetzt und der die Werkstückteile miteinander verbindet, die als Bearbeitungsprodukte einer trennenden Bearbeitung eines plattenartigen Werkstücks, insbesondere eines Blechs, vorliegen und die jeweils eine Trennfläche aufweisen, in deren Querrichtung der Verbindungssteg verläuft,
- mit zwei Werkzeugteilen, welche beim Druckumformen des Verbindungsstegs einander gegenüberliegenden Seiten des Verbindungsstegs zugeordnet sind und welche relativ zueinander längs einer Hubachse bewegbar sind, die beim Druckumformen des Verbindungsstegs in Querrichtung des Verbindungsstegs verläuft,
- wobei ein erster der Werkzeugteile ein Umformorgan aufweist, welches ein freies Ende des ersten Werkzeugteils wenigstens teilweise ausbildet,
- wobei der zweite Werkzeugteil eine in Querrichtung der Hubachse verlaufende und dem freien Ende des ersten Werkzeugteils zugewandte Auflagefläche für den Verbindungssteg aufweist und
- wobei die beiden Werkzeugteile längs der Hubachse mit einem Bearbeitungshub aufeinander zu in eine Hub-Endposition bewegbar sind, in welcher das Umformorgan des ersten Werkzeugteils und die Auflagefläche des zweiten Werkzeugteils längs der Hubachse einen Abstand voneinander aufweisen, der beim Druckumformen des Verbindungsstegs kleiner ist als die Erstreckung des umzuformenden Verbindungsstegs längs der Hubachse und in welcher der Verbindungssteg beim Druckumformen an der Auflagefläche des zweiten Werkstückteils abgestützt ist.
- with two tool parts which are assigned to opposite sides of the connecting web when the connecting web is pressure-formed and which are movable relative to one another along a lifting axis which runs in the transverse direction of the connecting web when the connecting web is pressure-formed,
- wherein a first of the tool parts has a shaping element which at least partially forms a free end of the first tool part,
- wherein the second tool part has a contact surface for the connecting web that runs in the transverse direction of the stroke axis and faces the free end of the first tool part, and
- wherein the two tool parts along the stroke axis are movable towards each other with a machining stroke in a stroke end position in which the forming member of the first tool part and the bearing surface of the second tool part have a distance from one another along the stroke axis which is smaller than that during the pressure forming of the connecting web Extension of the connecting web to be formed along the lifting axis and in which the connecting web is supported on the contact surface of the second workpiece part during pressure forming.
Die Erfindung betrifft außerdem ein mittels des vorstehenden Umformwerkzeugs und/oder mittels der vorstehenden Werkzeugmaschine durchgeführtes Verfahren zum Druckumformen eines Verbindungsstegs der genannten Art.The invention also relates to a method for pressure forming a connecting web of the type mentioned carried out by means of the above forming tool and / or by means of the above machine tool.
Schließlich betrifft die Erfindung Verfahren zum Bearbeitung von plattenartigen Werkstücken, insbesondere zum Bearbeiten von Blechen, im Rahmen derer zwei Werkstückteile voneinander getrennt werden,
- indem die beiden Werkstückteile zunächst unter Erstellen einer Trennfläche an jedem der beiden Werkstückteile und unter Stehenlassen wenigstens eines Verbindungsstegs unvollständig voneinander getrennt werden, der an seinen Enden an den Werkstückteilen ansetzt, der die Werkstückteile miteinander verbindet und der in Querrichtung der Trennflächen verläuft,
- indem nach dem unvollständigen Trennen der Werkstückteile der Verbindungssteg druckumgeformt wird und
- indem die beiden Werkstückteile anschließend durch Lösen der durch den umgeformten Verbindungssteg hergestellten Verbindung vollständig voneinander getrennt werden.
- in that the two workpiece parts are first incompletely separated from one another by creating a separating surface on each of the two workpiece parts and leaving at least one connecting web which attaches to the workpiece parts at its ends, which connects the workpiece parts to one another and which runs in the transverse direction of the separating surfaces,
- by pressure-forming the connecting web after the incomplete separation of the workpiece parts, and
- in that the two workpiece parts are then completely separated from one another by loosening the connection made by the deformed connecting web.
Vorrichtungen und Verfahren mit den vorgenannten Merkmalen sind bekannt aus
Die Aufgabe der vorliegenden Erfindung besteht darin, eine kraftabhängige Steuerung der Druckumformung von Verbindungsstegen der vorstehend beschriebenen Art zu ermöglichen.The object of the present invention is to enable a force-dependent control of the pressure conversion of connecting webs of the type described above.
Erfindungsgemäß gelöst wird diese Aufgabe durch das Umformwerkzeug und die Werkzeugmaschine gemäß den Patentansprüchen 1 und 10 sowie durch die Verfahren gemäß den Patentansprüchen 12, 14 und 16.According to the invention, this object is achieved by the forming tool and the machine tool according to
Das erfindungsgemäße Umformwerkzeug ermöglicht eine kraftabhängige Steuerung des Bearbeitungshubs der Werkzeugteile des Umformwerkzeugs. Eine längs der Hubachse wirksame gegenseitige Abstützung der Werkzeugteile unter Umgehung des druckumgeformten Verbindungsstegs realisiert, indem der erste Werkzeugteil eine portalartige Gestalt aufweist und den umzuformenden Verbindungssteg während dessen Bearbeitung übergreift. Die Portalstützen des ersten Werkzeugteils setzen bei Hub-Endposition der beiden Werkzeugteile auf dem zweiten Werkzeugteil seitlich neben dem Verbindungssteg auf. Das Umformorgan ist an dem portalartig ausgebildeten ersten Werkzeugteil zwischen den Portalstützen angeordnet.The forming tool according to the invention enables force-dependent control of the machining stroke of the tool parts of the forming tool. Mutual support of the tool parts effective along the stroke axis, bypassing the pressure-formed connecting web, is realized in that the first tool part has a portal-like shape and overlaps the connecting web to be formed during its processing. The portal supports of the first tool part are in the stroke end position of the two tool parts on the second tool part on the side next to the connecting web. The shaping element is arranged on the first tool part, which is designed like a portal, between the portal supports.
Es wird von einem Umformwerkzeug Gebrauch gemacht, das zusätzlich zu einem mit einem Umformorgan versehenen ersten Werkzeugteil einen mit einer durchgehend ebenen Auflagefläche versehenen und folglich konstruktiv einfach gestalteten zweiten Werkzeugteil umfasst. Insbesondere besteht die Möglichkeit, den zweiten Werkzeugteil als ein scheibenförmiges Bauteil mit längs der Hubachse des Umformwerkzeugs geringer Bauhöhe auszuführen.Use is made of a forming tool which, in addition to a first tool part provided with a forming element, comprises a second tool part which is provided with a continuously flat bearing surface and is consequently of simple design. In particular, there is the possibility of to execute the second tool part as a disk-shaped component with a low overall height along the stroke axis of the forming tool.
Auch für das Umformorgan des ersten Werkzeugteils sind erfindungsgemäß unterschiedliche Ausführungen denkbar. In Frage kommen beispielsweise Umformorgane, die mit dem restlichen Werkzeugteil starr verbunden sind, aber auch Umformorgane, die an einem Grundkörper des ersten Werkzeugteils drehbar gelagert sind und folglich zur Druckumformung des Verbindungsstegs auf diesem abrollen können.According to the invention, different designs are also conceivable for the shaping element of the first tool part. For example, forming elements that are rigidly connected to the rest of the tool part are suitable, but also forming elements that are rotatably mounted on a base body of the first tool part and can consequently roll on the connecting web for pressure forming.
Nach dem Druckumformen eines Verbindungsstegs besitzt der Verbindungssteg nur noch einen verhältnismäßig kleinen Querschnitt, der derart bemessen ist, dass die Anbindung des Verbindungsstegs an den benachbarten Werkstückteil mit geringem Kraftaufwand, beispielsweise durch Hin- und Herbewegen des bearbeiteten Werkstücks gelöst werden kann. Dessen ungeachtet kann der Verbindungssteg vor dem Druckumformen derart dimensioniert sein, dass er eine belastbare Verbindung zwischen den betreffenden Werkstückteilen herstellt.After the pressure forming of a connecting web, the connecting web only has a relatively small cross section, which is dimensioned such that the connection of the connecting web to the adjacent workpiece part can be released with little effort, for example by moving the machined workpiece back and forth. Regardless of this, the connecting web can be dimensioned before the pressure forming in such a way that it creates a load-bearing connection between the relevant workpiece parts.
Als Werkstückteile können Gutteile untereinander aber auch ein oder mehrere Gutteile mit einem Abfallteil, beispielsweise mit einem Restgitter, durch Verbindungsstege verbunden sein. Die Verbindungsstege können beispielsweise an geradlinig oder bogenförmig verlaufenden Kanten aber auch an Ecken der miteinander verbundenen Werkstückteile ansetzen. Im Interesse einer möglichst langen Standzeit des Umformwerkzeugs sollten die Verbindungsstege gegenüber dem Umformorgan des ersten Werkzeugteils derart ausgerichtet sein, dass die Verbindungsstege dem Umformorgan längs der Hubachse mit Flächen und nicht mit Kanten gegenüberliegen. Beim Erstellen der Verbindungsstege ist deshalb eine Torsion der Verbindungsstege um ihre Längsachse zu vermeiden.As workpiece parts, good parts can also be connected to one another or one or more good parts with a waste part, for example with a scrap skeleton, by connecting webs. The connecting webs can start, for example, at straight or curved edges, but also at corners of the workpiece parts connected to one another. In the interest of the longest possible service life of the forming tool, the connecting webs should be aligned with the forming member of the first tool part in such a way that the connecting webs face the forming member along the stroke axis with surfaces and not with edges. When creating the connecting webs, torsion of the connecting webs around their longitudinal axis must therefore be avoided.
Ebenfalls im Interesse einer Optimierung der Standzeit des erfindungsgemäßen Umformwerkzeugs können Werkstoffteilchen, die beim Druckumformen eines Verbindungsstegs beispielsweise als Späne anfallen, von der Bearbeitungsstelle abgeführt werden. Zu diesem Zweck ist in bevorzugter Ausgestaltung der Erfindung wenigstens einer der Werkzeugteile des erfindungsgemäßen Umformwerkzeugs mit einer entsprechenden Absaugung versehen. Durch das Abführen von Werkstoffteilchen von der Bearbeitungsstelle wird im Übrigen auch verhindert, dass die Werkstoffteilchen an den über Verbindungsstege miteinander verbundenen Werkstückteilen Spuren hinterlassen und dadurch die Qualität der Werkstückbearbeitung mindern.Also in the interest of optimizing the service life of the forming tool according to the invention, material particles which are produced, for example, as chips when pressure-forming a connecting web, can be removed from the processing point. For this purpose, the invention is in a preferred embodiment Provide at least one of the tool parts of the forming tool according to the invention with a corresponding suction. The removal of material particles from the processing point also prevents the material particles from leaving traces on the workpiece parts connected to one another via connecting webs and thereby reducing the quality of the workpiece processing.
An der erfindungsgemäßen Werkzeugmaschine ist der zum Druckumformen eines Verbindungsstegs auszuführende Bearbeitungshub kraftabhängig gesteuert. Die Werkzeugteile des erfindungsgemäßen Umformwerkzeugs sind in Werkzeugaufnahmen angeordnet, die an einander gegenüberliegenden Seiten des umzuformenden Verbindungsstegs bzw. der durch den umzuformenden Verbindungssteg miteinander verbundenen Werkstückteile vorgesehen sind und die numerisch gesteuert längs der Hubachse der Werkzeugteile relativ zueinander bewegt werden können. Außerdem kann die Möglichkeit bestehen, die Werkzeugaufnahmen gemeinsam mit den daran fixierten Werkzeugteilen um die Hubachse dreheinzustellen. Aufgrund der Geometrie des zweiten Werkzeugteils des erfindungsgemäßen Umformwerkzeugs bedarf es in aller Regel aber keiner Dreheinstellung derjenigen Werkzeugaufnahme, in welcher der mit der durchgehend ebenen Auflagefläche versehene Werkzeugteil aufgenommen ist.On the machine tool according to the invention, the machining stroke to be carried out for pressure forming a connecting web is controlled as a function of force. The tool parts of the forming tool according to the invention are arranged in tool holders, which are provided on opposite sides of the connecting web to be formed or the workpiece parts connected to one another by the connecting web to be formed, and which can be moved numerically controlled relative to one another along the stroke axis of the tool parts. There may also be the option of rotating the tool holders together with the tool parts attached to them about the stroke axis. Because of the geometry of the second tool part of the shaping tool according to the invention, however, it is generally not necessary to turn the tool holder in which the tool part provided with the continuously flat contact surface is accommodated.
Das zuvor trennend bearbeitete Werkstück ruht üblicherweise auf einer herkömmlichen Werkstückauflage der Werkzeugmaschine. Durch eine parallel zu der Plattenebene des bearbeiteten Werkstücks ausgeführte Relativbewegung der Werkstückteile und der Verbindungsstege einerseits und der Werkzeugaufnahmen der Werkzeugmaschine andererseits werden die Verbindungsstege gegenüber den in den Werkzeugaufnahmen gehaltenen Werkzeugteilen des Umformwerkzeugs zur Bearbeitung positioniert.The previously machined workpiece usually rests on a conventional workpiece support of the machine tool. Through a relative movement of the workpiece parts and the connecting webs on the one hand and the tool holders of the machine tool on the other hand, the connecting webs are positioned for processing relative to the tool parts of the forming tool held in the tool holders.
Im Rahmen des erfindungsgemäßen Umformverfahrens wird ein umzuformender Verbindungssteg einerseits durch das Umformorgan des ersten Werkzeugteils druckbeaufschlagt und andererseits an der Auflagefläche des als Widerlager für den ersten Werkzeugteil dienenden zweiten Werkzeugteils abgestützt. Die Linie, entlang derer dabei das Umformorgan des ersten Werkzeugteils in den Verbindungssteg eintaucht, kann beispielsweise in Verlängerung einer Trennfläche verlaufen, die an dem benachbarten Werkstückteil bei der Erzeugung des Verbindungsstegs erstellt worden ist, sie kann aber auch dieser Trennfläche vorgelagert oder gegenüber der Trennfläche in das Innere des Werkstückteils zurückversetzt sein. In dem letztgenannten Fall ist gewährleistet, dass Reste des Verbindungsstegs, die beim Trennen des Verbindungsstegs von dem Werkstückteil an dem Werkstückteil verbleiben, nicht über die beim Erzeugen des Verbindungsstegs an dem Werkstückteil erstellte Trennfläche vorstehen. Gegebenenfalls überlappt das Umformorgan des ersten Werkzeugteils mit einem Werkstückteil vorzugsweise in der Größenordnung von Zehntelmillimetern.In the context of the forming method according to the invention, a connecting web to be formed is pressurized on the one hand by the forming member of the first tool part and on the other hand is supported on the contact surface of the second tool part serving as an abutment for the first tool part. The line, along which the forming element of the first tool part dips into the connecting web can, for example, extend an extension of a separating surface that was created on the adjacent workpiece part when the connecting web was created, but it can also be placed upstream of this separating surface or opposite the separating surface into the interior of the Part of the workpiece must be set back. In the latter case, it is ensured that remnants of the connecting web, which remain on the workpiece part when the connecting web is separated from the workpiece part, do not protrude beyond the separating surface created on the workpiece part when the connecting web is produced. The forming element of the first tool part may overlap with a workpiece part, preferably in the order of tenths of a millimeter.
Je nach Anwendungsfall, beispielsweise je nach Bemessung der Breite des Verbindungsstegs einerseits und des Umformorgans des ersten Werkzeugteils andererseits, führen die Werkzeugteile des erfindungsgemäßen Umformwerkzeugs zum Umformen eines Verbindungsstegs relativ zueinander einen einzelnen Bearbeitungshub oder mehrere aufeinanderfolgende Bearbeitungshübe aus.Depending on the application, for example depending on the dimensioning of the width of the connecting web on the one hand and the forming member of the first tool part on the other hand, the tool parts of the forming tool according to the invention perform a single machining stroke or several successive machining strokes relative to one another for shaping a connecting web.
Das erfindungsgemäße Umformverfahren ist Teil des erfindungsgemäßen Trennverfahrens und auch Teil des erfindungsgemäßen Bearbeitungsverfahrens, im Laufe dessen das erfindungsgemäße Trennverfahren und zusätzlich eine weitere Werkstückbearbeitung durchgeführt werden. Im Rahmen des erfindungsgemäßen Bearbeitungsverfahrens kann das erfindungsgemäße Umformwerkzeug dazu dienen, den oder die Verbindungsstege auf eine Art und Weise umzuformen, die auf die zusätzlich zu der trennenden Bearbeitung vorgesehene Werkstückbearbeitung abgestimmt ist. Insbesondere besteht die Möglichkeit, beim Umformen des oder der Verbindungsstege an einem Werkstückteil Geometrien zu erzeugen, wie sie im Rahmen der zusätzlichen Werkstückbearbeitung an der restlichen Trennfläche des betreffenden Werkstückteils hergestellt werden.The forming method according to the invention is part of the cutting method according to the invention and also part of the machining method according to the invention, in the course of which the cutting method according to the invention and additionally a further workpiece machining are carried out. Within the scope of the machining method according to the invention, the forming tool according to the invention can be used to reshape the connecting bridge or bridges in a manner which is matched to the workpiece machining provided in addition to the separating machining. In particular, there is the possibility, when the connecting web (s) are formed on a workpiece part, to produce geometries such as those produced in the course of the additional workpiece machining on the remaining parting surface of the workpiece part in question.
Besondere Ausführungsarten der Erfindung nach den unabhängigen Patentansprüchen ergeben sich aus den abhängigen Patentansprüchen 2 bis 9, 11, 13 und 15.Particular embodiments of the invention according to the independent patent claims result from the dependent patent claims 2 to 9, 11, 13 and 15.
Beim Druckumformen des Verbindungsstegs und dem damit verbundenen Eintauchen des Umformorgans des ersten Werkzeugteils in den Verbindungssteg wird durch das Umformorgan werkstückseitig eine Trennfläche erstellt. Dieser Umstand ist insbesondere dann von Bedeutung, wenn das Umformorgan des ersten Werkzeugteils an einem Ende des betreffenden Verbindungsstegs und folglich in unmittelbarer Nachbarschaft eines Werkstückteils ansetzt. Durch entsprechende Gestaltung des Umformorgans kann auf die Beschaffenheit der durch das Umformorgan erzeugten Trennfläche Einfluss genommen werden. Weist das Umformorgan an dem Übergang zwischen seiner Werkstückseite und dem freien Ende des ersten Werkzeugteils eine scharfe Kante auf, so erzeugt es eine glatte und somit qualitativ hochwertige Trennfläche.During the pressure forming of the connecting web and the associated immersion of the forming member of the first tool part in the connecting web, a parting surface is created on the workpiece side by the forming member. This circumstance is particularly important when the shaping element of the first tool part attaches to one end of the connecting web in question and consequently in the immediate vicinity of a workpiece part. By appropriately designing the forming member, the condition of the separating surface created by the forming member can be influenced. If the forming element has a sharp edge at the transition between its workpiece side and the free end of the first tool part, it creates a smooth and thus high-quality separating surface.
Im Falle der Erfindungsbauart gemäß Patentanspruch 2 ist vorgesehen, dass das Umformorgan des ersten Werkzeugteils an einer Werkstückseite längs der Hubachse parallel zu der Trennfläche oder unter einem Winkel gegenüber der Trennfläche an demjenigen Werkstückteil verläuft, welchem die Werkstückseite des Umformorgans beim Druckumformen des Verbindungsstegs zugewandt ist. Ist die Werkstückseite des Umformorgans parallel zu der Trennfläche an dem betreffenden Werkstückteil, so verläuft auch die mittels des Umformorgans an dem betreffenden Werkstückteil erstellte Trennfläche parallel zu der vor dem Druckumformen des Verbindungsstegs erstellten Trennfläche des Werkstückteils. Verläuft die Werkstückseite des Umformorgans unter einem Winkel gegenüber der bereits vor dem Umformen des Verbindungsstegs erstellten Trennfläche an dem betreffenden Werkstückteil, so gilt Entsprechendes für die mittels des Umformorgans an dem Werkstückteil erzeugte Trennfläche. Eine parallel zu der Trennfläche an dem betreffenden Werkstückteil verlaufende Trennfläche wird mittels des Umformorgans erfindungsgemäß insbesondere dann erzeugt, wenn die mittels des Umformorgans erzeugte Trennfläche in Verlängerung der bereits vorhandenen Trennfläche an dem Werkstückteil verläuft. Die Erstellung einer unter einem Winkel gegen die bereits vorhandene Trennfläche des Werkstückteils geneigten Trennfläche mittels des Umformorgans ist erfindungsgemäß beispielsweise in Fällen vorgesehen, in denen vor oder nach dem Umformen des Verbindungsstegs die bereits vorhandene Trennfläche an dem Werkstückteil durch zusätzliche Kantenbearbeitung des Werkstückteils umgeformt und dabei abgeschrägt wird. Bei entsprechender Wahl des Winkels zwischen der Werkstückseite des Umformorgans und der bereits vorhandenen Trennfläche des Werkstückteils fluchtet die mittels des Umformorgans an dem Werkstück erzeugte Schrägfläche mit der Schrägfläche, die im Rahmen der zusätzlichen Kantenbearbeitung des Werkstückteils erstellt wird.In the case of the type of invention according to
Ausweislich Patentanspruch 3 ist der erste Werkzeugteil in bevorzugter Ausgestaltung der Erfindung als sich verjüngender Werkzeugteil ausgebildet, wobei sich das Umformorgan des ersten Werkzeugteils längs der Hubachse zu dem freien Ende des ersten Werkzeugteils hin verjüngt. Insbesondere im Hinblick auf die zum Druckumformen eines Verbindungsstegs aufzubringende Umformkraft ist diese Bauart des erfindungsgemäßen Umformwerkzeugs vorteilhaft.According to
Gemäß Patentanspruch 4 ist in weiterer bevorzugter Ausgestaltung des erfindungsgemäßen Umformwerkzeugs an einer von der Werkstückseite abgewandten Stegseite des Umformorgans des sich verjüngenden Werkzeugteils eine Umformfläche vorgesehen, die ausgehend von dem freien Ende des sich verjüngenden Werkzeugteils längs der Hubachse von der Werkstückseite des Umformorgans weg verläuft und dementsprechend gegenüber der Hubachse geneigt ist. Im Rahmen der mittels dieser Bauart des erfindungsgemäßen Umformwerkzeugs durchgeführten Variante des erfindungsgemäßen Umformverfahrens (Patentanspruch 13) wird an der dem sich verjüngenden Werkzeugteil zugeordneten Seite des Verbindungsstegs Werkstoff des Verbindungsstegs mittels des Umformorgans des sich verjüngenden Werkzeugteils plastifiziert und plastifizierter Werkstoff des Verbindungsstegs an der Stegseite des Umformorgans durch die Umformfläche des Umformorgans von dessen Werkstückseite weg verdrängt.According to
Wird das Umformwerkzeug an einem Ende eines umzuformenden Verbindungsstegs angesetzt, so erzeugt das Umformorgan des sich verjüngenden Werkzeugteils aufgrund seiner besonderen Geometrie an dem betreffenden Ende des Verbindungsstegs eine Bruchzone, die derart beschaffen ist, dass nach dem Brechen des Verbindungsstegs keine oder nur allenfalls geringfügige Spuren des Verbindungsstegs an dem Werkstückteil zurückbleiben. Da plastifizierter Werkstoff des Verbindungsstegs, der durch das Umformorgan erzeugt wird, von der Werkstückseite des Umformorgans und somit auch von dem an den Verbindungssteg angrenzenden Werkstückteil weg verdrängt wird, kann der plastifizierte Werkstoff des Verbindungsstegs an dem betreffenden Werkstückteil keine oder allenfalls geringfügige Spuren hinterlassen. An dem Verbindungssteg gebildeter Grat wird im Rahmen des erfindungsgemäßen Trennverfahrens gemeinsam mit dem Verbindungssteg entfernt und beeinträchtigt folglich die Qualität der Trennfläche an dem Werkstückteil nicht.If the shaping tool is attached to one end of a connecting web to be shaped, the shaping element of the tapering tool part creates a fracture zone at the relevant end of the connecting web due to its special geometry, which is such that after the connecting web has broken, no or only slight traces of the Remaining connecting web on the workpiece part. Because plasticized material of Connecting web, which is generated by the forming member, is displaced away from the workpiece side of the forming member and thus also from the workpiece part adjacent to the connecting web, the plasticized material of the connecting web can leave no or at most slight traces on the workpiece part in question. Burrs formed on the connecting web are removed together with the connecting web in the course of the separating method according to the invention and consequently does not impair the quality of the separating surface on the workpiece part.
Für das Umformorgan an dem ersten Werkzeugteil des erfindungsgemäßen Umformwerkzeugs kommen unterschiedliche Geometrien in Frage. Denkbar ist beispielsweise ein Umformorgan mit einem rechteckigen Querschnitt.Different geometries are possible for the forming member on the first tool part of the forming tool according to the invention. For example, a forming element with a rectangular cross section is conceivable.
Gemäß Patentanspruch 5 weist das Umformorgan eines sich verjüngenden ersten Werkzeugteils in einer parallel zu der Hubachse verlaufenden Schnittebene einen dreiecksförmigen Querschnitt oder einen trapezförmigen Querschnitt auf. Ein Umformorgan mit Dreiecksquerschnitt ist an seiner Stirnseite an sich linienförmig. Zur Erhöhung der Standzeit kann ein derartiges Umformorgan in bevorzugter Ausgestaltung der Erfindung mit einer geringfügigen Abflachung oder Abrundung an der die Stirnseite des Umformorgans ausbildenden Dreiecksspitze versehen sein. Abweichend von einem Umformorgan mit Dreiecksquerschnitt ist ein Umformorgan mit trapezförmigem Querschnitt an seiner Stirnseite flächig ausgebildet und folglich im Betrieb weniger Verschleiß unterworfen als ein im Querschnitt dreiecksförmiges Umformorgan. Auch von der Trapezform abweichende Querschnitte, die an dem Umformorgan des sich verjüngenden Werkzeugteils eine Stirnfläche ausbilden, sind erfindungsgemäß denkbar.According to
Ein Umformorgan mit einem dreiecksförmigen oder mit einem trapezförmigen Querschnitt wird in Weiterbildung der Erfindung dadurch bereitgestellt, dass das Umformorgan des sich verjüngenden Werkzeugteils von einem mit einem Innenhohlraum, vorzugsweise einem Innenkonus, versehenen freien Ende des sich verjüngenden Werkzeugteils gebildet ist (Patentanspruch 6). Beim Druckumformen eines Verbindungsstegs kann Werkstoff des Verbindungsstegs in das Innere des Innenhohlraums abfließen. Dadurch reduziert sich der Widerstand, welchen der Verbindungssteg der Bearbeitung durch das erfindungsgemäße Umformwerkzeug entgegensetzt. In Weiterbildung der Erfindung kann an dem Übergang zwischen dem freien Ende des sich verjüngenden Werkzeugteils und dem Innenkonus ein Radius oder eine Abschrägung vorgesehen sein. Der Radius und die Abschrägung sorgen gegebenenfalls dafür, dass der umgeformte Verbindungssteg bei der endgültigen Trennung der Werkstückteile nicht an dieser Stelle sondern vielmehr dort bricht, wo das Umformorgan des sich verjüngenden Werkzeugteils mit der Kante ansetzt, die an dem Übergang zwischen der Werkstückseite des Umformorgans und dem freien Ende des sich verjüngenden Werkzeugteils gebildet ist.A forming element with a triangular or with a trapezoidal cross section is provided in a further development of the invention in that the forming element of the tapering tool part is formed by a free end of the tapering tool part provided with an inner cavity, preferably an inner cone (claim 6). When a connecting web is formed by pressure, material of the connecting web can flow into the interior of the inner cavity. This reduces the resistance, which one the connecting web opposes the processing by the forming tool according to the invention. In a development of the invention, a radius or a bevel can be provided at the transition between the free end of the tapered tool part and the inner cone. The radius and the bevel, if necessary, ensure that the reshaped connecting web does not break at this point when the workpiece parts are finally separated, but rather where the reshaping element of the tapering tool part starts with the edge that is at the transition between the workpiece side of the reshaping element and the free end of the tapered tool part is formed.
Insbesondere in Fällen, in denen ein Verbindungssteg eine Verbindung zwischen zwei als Gutteile vorgesehenen Werkstückteilen herstellt, ist der Verbindungssteg von beiden Werkstückteilen zu trennen. Patentanspruch 7 betrifft eine zu diesem Zweck vorgesehene Bauart des erfindungsgemäßen Umformwerkzeugs, die es erlaubt, einen Verbindungssteg zeitgleich an mehreren längs des Verbindungsstegs voneinander beabstandeten Stellen umzuformen und dadurch für die vollständige Trennung der über den Verbindungssteg miteinander verbundenen Werkstückteile zu schwächen. Jede der Umformstellen an dem Verbindungssteg wird dabei durch einen Organabschnitt des an dem ersten Werkzeugteil vorgesehenen Umformorgans bearbeitet.In particular in cases in which a connecting web establishes a connection between two workpiece parts provided as good parts, the connecting web must be separated from both workpiece parts.
Zur Ausbildung von Organabschnitten, die verschiedenen Bearbeitungsstellen an einem Verbindungssteg zugeordnet sind, werden im Falle der Erfindung unterschiedliche Möglichkeiten zur konstruktiven Gestaltung des Umformorgans an dem sich verjüngenden Werkzeugteil genutzt.In the case of the invention, different options for constructive design of the forming member on the tapered tool part are used to form organ sections which are assigned to different processing points on a connecting web.
Gemäß Patentanspruch 8 verläuft das Umformorgan des ersten Werkzeugteils in bevorzugter Ausgestaltung der Erfindung in einer Umfangsrichtung und dabei insbesondere bogenförmig, vorzugsweise längs eines Kreisbogens, um die Hubachse. Die Erstreckung des Umformorgans in Umfangsrichtung kann dabei derart bemessen sein, dass das Umformorgan beim Umformen eines Verbindungsstegs gleichzeitig an mehreren Stellen des Verbindungsstegs angreift. Ein bogenförmiger, insbesondere ein kreisförmiger Verlauf des Umformorgans bietet die Möglichkeit, die Bruchzone, an welcher der Verbindungssteg nach dem Umformen brechen soll, an dem an den Verbindungssteg anschließenden Werkstückteil in einem Bereich anzuordnen, der gegenüber der an diesem Werkstückteil bereits vor dem Umformen des Verbindungsstegs erstellten Trennfläche in das Innere des Werkstückteils zurückversetzt ist. Ein kreisförmiger Verlauf des Umformorgans ist darüber hinaus insofern vorteilhaft, als durch eine einfache Dreheinstellung des ersten Werkzeugteils um eine mit dem Umformorgan konzentrische Positionierachse unterschiedliche Organabschnitte des Umformorgans ein und derselben Bearbeitungsstelle und/oder ein und dieselben Organabschnitte unterschiedlichen Bearbeitungsstellen zugeordnet werden können. Der sukzessive Einsatz unterschiedlicher Organabschnitte des Umformorgans empfiehlt sich insbesondere aufgrund der damit verbundenen Vergleichmäßigung des Werkzeugverschleißes.According to
Gemäß Patentanspruch 9 ist in Weiterbildung des erfindungsgemäßen Umformwerkzeugs das Umformorgan des ersten Werkzeugteils in Umfangsrichtung endlos ausgebildet. Alternativ ist im Falle der Erfindung aber auch ein in Umfangsrichtung segmentiertes Umformorgan denkbar.According to claim 9, in a further development of the forming tool according to the invention, the forming member of the first tool part is endless in the circumferential direction. Alternatively, in the case of the invention, a shaping element segmented in the circumferential direction is also conceivable.
In bevorzugter Ausgestaltung des erfindungsgemäßen Trennverfahrens ist ausweislich Patentanspruch 15 vorgesehen, dass bei der Bearbeitung eines plattenartigen Werkstücks aus einem elastisch verformbaren Werkstoff der wenigstens eine Verbindungssteg als Festkörpergelenk erstellt wird und in Querrichtung der Trennflächen der durch den Verbindungssteg miteinander verbundenen Werkstückteile federelastisch ist. Wird ein derartiger Verbindungssteg mittels des erfindungsgemäßen Umformwerkzeugs umgeformt, so kann der Verbindungssteg unter Ausnutzung seiner Elastizität gestaucht werden. Zur Umformung des Verbindungsstegs ist folglich nur eine verhältnismäßig geringe Kraft aufzuwenden. Dies gilt insbesondere in Fällen, in denen ein Verbindungssteg gleichzeitig an beiden Enden druckumgeformt wird.According to a preferred embodiment of the separation method according to the invention, claim 15 provides that when machining a plate-like workpiece made of an elastically deformable material, the at least one connecting web is created as a solid-state joint and is resilient in the transverse direction of the separating surfaces of the workpiece parts connected to one another by the connecting web. If such a connecting web is formed by means of the shaping tool according to the invention, the connecting web can be compressed using its elasticity. Consequently, only a relatively small force is to be used to reshape the connecting web. This applies in particular in cases in which a connecting web is pressure-formed at both ends at the same time.
Nachfolgend wird die Erfindung anhand beispielhafter schematischer Darstellungen näher erläutert.The invention is explained in more detail below on the basis of exemplary schematic representations.
Es zeigen:
Figur 1- eine Werkzeugmaschine für die Blechbearbeitung mit einer Schneidstation und einer Umformstation,
Figur 2- über Verbindungsstege miteinander verbundene Blechteile, erzeugt durch die Bearbeitung einer Blechtafel an der Werkzeugmaschine gemäß
Figur 1 , Figur 3- ein Umformwerkzeug erster Bauart zum Einsatz an der Umformstation der Werkzeugmaschine gemäß
Figur 1 (nicht erfindungsgemäß), Figuren 4 bis 9- Darstellungen zur Veranschaulichung der Funktionsweise des Umformwerkzeugs gemäß
Figur 3 beim Umformen von zwischen zwei Blechteilen vorgesehenen Verbindungsstegen, - Figuren 10a, 10b, 10c
- die Oberwerkzeuge weiterer Bauarten eines Umformwerkzeugs (nicht erfindungsgemäß) zum Einsatz an der Umformstation der Werkzeugmaschine gemäß
Figur 1 , Figur 11- eine Darstellung zur Veranschaulichung der Funktionsweise des Umformwerkzeugs gemäß
Figur 10a , Figur 12- eine Darstellung zur Veranschaulichung der Funktionsweise des Umformwerkzeugs gemäß
Figur 10b und des Umformwerkzeugs gemäßFigur 10c , Figur 13- das Oberwerkzeug einer weiteren Bauart eines Umformwerkzeugs (nicht erfindungsgemäß) zum Einsatz an der Umformstation der Werkzeugmaschine gemäß
Figur 1 , Figur 14- das Umformwerkzeug mit dem
Oberwerkzeug gemäß Figur 13 bei der Bearbeitung eines Verbindungsstegs in einem ersten Anwendungsfall, Figur 15- das Umformwerkzeug mit dem
Oberwerkzeug gemäß Figur 13 bei der Bearbeitung eines Verbindungsstegs in einem zweiten Anwendungsfall, Figur 16- das Oberwerkzeug einer weiteren Bauart eines Umformwerkzeugs (nicht erfindungsgemäß) zum Einsatz an der Umformstation der Werkzeugmaschine gemäß
Figur 1 , Figur 17- eine Variante des Umformwerkzeugs gemäß
Figur 3 zur Verwendung bei kraftabhängiger Steuerung eines von dem Umformwerkzeug ausgeführten Bearbeitungshubs, Figur 18- eine Variante des Umformwerkzeugs gemäß
den Figuren 13 zur Verwendung bei kraftabhängiger Steuerung eines von dem Umformwerkzeug ausgeführten Bearbeitungshubs,bis 15 Figur 19- eine Variante des Umformwerkzeugs gemäß
Figur 16 zur Verwendung bei kraftabhängiger Steuerung eines von dem Umformwerkzeug ausgeführten Bearbeitungshubs und Figur 20- zwei über einen Verbindungssteg miteinander verbundene Blechteile während einer Kantenbearbeitung der Blechteile.
- Figure 1
- a machine tool for sheet metal processing with a cutting station and a forming station,
- Figure 2
- Sheet metal parts connected to one another via connecting webs, produced by machining a sheet metal sheet on the machine tool in accordance with
Figure 1 , - Figure 3
- a forming tool of the first type for use at the forming station of the machine tool according to
Figure 1 (not according to the invention), - Figures 4 to 9
- Representations to illustrate the functioning of the forming tool according to
Figure 3 when forming connecting webs provided between two sheet metal parts, - Figures 10a, 10b, 10c
- the upper tools of further types of a forming tool (not according to the invention) for use at the forming station of the machine tool according to
Figure 1 , - Figure 11
- a representation to illustrate the operation of the forming tool according to
Figure 10a , - Figure 12
- a representation to illustrate the operation of the forming tool according to
Figure 10b and according to the forming toolFigure 10c , - Figure 13
- the upper tool of a further type of forming tool (not according to the invention) for use at the forming station of the machine tool
Figure 1 , - Figure 14
- the forming tool according to the upper tool
Figure 13 when processing a connecting bridge in a first application, - Figure 15
- the forming tool according to the upper tool
Figure 13 when processing a connecting bridge in a second application, - Figure 16
- the upper tool according to a further type of forming tool (not according to the invention) for use at the forming station of the machine tool
Figure 1 , - Figure 17
- a variant of the forming tool according to
Figure 3 for use in force-dependent control of a machining stroke carried out by the forming tool, - Figure 18
- a variant of the forming tool according to the
Figures 13 to 15 for use in force-dependent control of a machining stroke carried out by the forming tool, - Figure 19
- a variant of the forming tool according to
Figure 16 for use in force-dependent control of a machining stroke carried out by the forming tool and - Figure 20
- two sheet metal parts connected to one another via a connecting web during edge processing of the sheet metal parts.
Gemäß
Die Laser-Schneidstation 5 umfasst einen Laserschneidkopf 7 an dem oberen Gestellschenkel 3 und eine Laserstrahlaufnahme 8 an dem unteren Gestellschenkel 4. Die Umformstation 6 weist eine obere Werkzeugaufnahme 9 an dem oberen Gestellschenkel 3 und eine untere Werkzeugaufnahme 10 an dem unteren Gestellschenkel 4 auf. In die obere Werkzeugaufnahme 9 ist als erster Werkzeugteil ein als Umformstempel 11 ausgebildetes Oberwerkzeug, in die untere Werkzeugaufnahme 10 als zweiter Werkzeugteil ein als Umformmatrize 12 ausgebildetes Unterwerkzeug eines Umformwerkzeugs 13 eingewechselt.The
Mittels eines herkömmlichen Hubantriebs für das Umformwerkzeug 13 kann der Umformstempel 11 längs einer Hubachse 14 relativ zu der Umformmatrize 12 angehoben und abgesenkt werden. Die obere Werkzeugaufnahme 9 und die untere Werkzeugaufnahme 10 sind gemeinsam mit dem Umformstempel 11 und der Umformmatrize 12 um die Hubachse 14 dreheinstellbar (Doppelpfeil in
An der Laser-Schneidstation 5 und an der Umformstation 6 werden plattenartige Werkstücke, in dem dargestellten Beispielsfall ein Blech 15, bearbeitet. Zu Bearbeitungszwecken wird das Blech 15 mittels einer herkömmlichen Koordinatenführung 16 mit einer zweiachsigen horizontalen Bewegung über eine Werkstückauflage 17 der Werkzeugmaschine 1 und dabei relativ zu dem Laserschneidkopf 7 und der Laserstrahlaufnahme 8 und auch relativ zu dem Umformwerkzeug 13 bewegt. In
Im Rahmen des an der Werkzeugmaschine 1 durchgeführten Bearbeitungsverfahrens wird das Blech 15 zunächst an der Laser-Schneidstation 5 trennend bearbeitet. Ein mögliches Ergebnis der trennenden Bearbeitung des Blechs 15 ist in
In dem Bearbeitungszustand gemäß
Im Einzelnen ist das Umformwerkzeug 13 mit dem als Oberwerkzeug vorgesehenen Umformstempel 11 und der als Unterwerkzeug vorgesehenen und in dem dargestellten Beispielsfall im Wesentlichen zylindrischen Umformmatrize 12 in
Der Umformstempel 11 weist einen axialen Endabschnitt auf, der als Umformorgan 24 ausgebildet ist. Das Umformorgan 24 bildet das freie Ende des Umformstempels 11 aus. Wie
Ein an dem axialen Endabschnitt des Umformstempels 11 vorgesehener und zu dem freien Ende des Umformstempels 11 hin offener Innenkonus 25 begrenzt gemeinsam mit der achsparallelen äußeren Mantelfläche des Umformstempels 11 eine Stirnfläche 26 des Umformorgans 24. Die achsparallele äußere Mantelfläche des Umformstempels 11 und die Stirnfläche 26 des stempelseitigen Umformorgans 24 bilden eine scharfe Kante aus, die beim Eintauchen des Umformstempels 11 in einen umzuformenden Verbindungssteg 23 eine glatte Trennfläche erzeugt. Ausweislich
Die Abläufe beim Druckumformen der Verbindungsstege 23 des bearbeiteten Blechs 15 werden zunächst am Beispiel eines der Verbindungsstege 23 zwischen dem Restgitter 18 und dem Blechteil 20 beschrieben.The processes involved in the pressure forming of the connecting
Vor Beginn des eigentlichen Umformprozesses wird das bearbeitete Blech 15 mittels der Koordinatenführung 16 der Werkzeugmaschine 1 relativ zu dem an der Umformstation 6 eingewechselten Umformwerkzeug 13 derart positioniert, dass das Umformwerkzeug 13 gegenüber dem umzuformenden Verbindungssteg 23 eine Bearbeitungs-Bereitschaftsposition einnimmt. Bei Bearbeitungs-Bereitschaftsposition des Umformwerkzeugs 13 ist der Umformstempel 11 des Umformwerkzeugs 13 längs der Hubachse 14 von der Oberseite des Verbindungsstegs 23 und der an diesen angrenzenden Werkstückteile beabstandet. Die Auflagefläche 27 der Umformmatrize 12 weist längs der Hubachse 14 einen minimalen Abstand von der Unterseite des Verbindungsstegs 23 und der durch diesen verbundenen Werkstückteile auf.Before the actual forming process begins, the processed
Aufgrund einer entsprechenden Dimensionierung des Durchmessers des Umformstempels 11 reicht die senkrechte Projektion der Stirnfläche 26 des Umformorgans 24 des in der Bearbeitungs-Bereitschaftsposition angeordneten Umformstempels 11 auf die Oberseite des bearbeiteten Blechs 15 an beiden Enden des Verbindungsstegs 23 über einen Ansatz 28 des Verbindungsstegs 23 an dem jeweiligen Werkstückteil hinaus. Dargestellt ist dies in
Ausgehend von der Bearbeitungs-Bereitschaftsposition wird der Umformstempel 11 mit einem Bearbeitungshub längs der Hubachse 14 in Richtung auf die Umformmatrize 12 bis in eine Hub-Endposition bewegt. In den Beispielsfällen gemäß den
Im Rahmen der wegabhängigen Steuerung des Bearbeitungshubs des Umformstempels 11 ist der Betrag des von dem Umformstempel 11 relativ zu der Umformmatrize 12 ausgeführten Bearbeitungshubs variabel einstellbar und hängt insbesondere von der gewünschten Restdicke des Verbindungsstegs 23 nach dem Umformen ab. Der von dem Umformstempel 11 längs der Hubachse 14 zurückgelegte Weg wird mittels eines herkömmlichen Wegmesssystems erfasst und bildet die Grundlage für die Steuerung des Hubantriebs der Werkzeugmaschine 1.As part of the path-dependent control of the machining stroke of the forming
Die Verhältnisse bei Hub-Endposition des Umformstempels 11 sind in
Der Umformstempel 11 ist im Laufe des Bearbeitungshubs mit diametral einander gegenüberliegenden Organabschnitten des Umformorgans 24 an beiden Enden des Verbindungsstegs 23 in diesen und in die angrenzenden Bereiche des Restgitters 18 und des Blechteils 20 eingetaucht. Eine Werkstückseite 29 des Umformorgans 24 ist dem Restgitter 18, eine Werkstückseite 30 des Umformorgans 24 dem Blechteil 20 zugewandt. Stegseiten 31, 32 des Umformorgans 24 weisen zu dem Verbindungssteg 23 hin und sind dementsprechend von dem Restgitter 18 und dem Blechteil 20 abgewandt.The forming
Die Werkstückseiten 29, 30 des Umformorgans 24 an dem Umformstempel 11 verlaufen parallel zu der Hubachse 14 und auch parallel zu einer bei der vorausgegangenen trennenden Bearbeitung des Blechs an dem Restgitter 18 erstellten Trennfläche 33 und einer entsprechenden, in
Aufgrund der sich damit ergebenden Geometrie des stempelseitigen Umformorgans 24 wird unter der Wirkung der Beaufschlagung des Verbindungsstegs 23 durch das Umformwerkzeug 13 plastifizierter Werkstoff des Verbindungsstegs 23 an den Stegseiten 31, 32 des stempelseitigen Umformorgans 24 zu dem Verbindungssteg 23 hin und damit von den Werkstückseiten 29, 30 des stempelseitigen Umformorgans 24 weg verdrängt.Due to the resulting geometry of the stamp-
An den Enden des Verbindungsstegs 23 wird durch das Druckumformen mittels des Umformwerkzeugs 13 der Querschnitt des Verbindungsstegs 23 längs der Hubachse 14 reduziert. Aufgrund des Übermaßes des Durchmessers der Stirnfläche 26 des stempelseitigen Umformorgans 24 gegenüber dem Verbindungssteg 23 sind die querschnittsreduzierten Ansätze des Verbindungsstegs 23 an dem Restgitter 18 und an dem Blechteil 20 gegenüber den Trennflächen 33 in das Innere des Restgitters 18 und des Blechteils 20 zurückversetzt.At the ends of the connecting
Ein entsprechender Versatz der Ansätze des querschnittsreduzierten Verbindungsstegs 23 an dem Restgitter 18 und an dem Blechteil 20 stellt sich ein, wenn die Trennflächen 33 an dem Restgitter 18 und dem Blechteil 20 bereits bei der dem Druckumformen der Verbindungsstege 23 vorgeschalteten trennenden Bearbeitung des Blechs 15 mit einem entsprechenden Rücksprung versehen werden (
In der anhand des Verbindungsstegs 23 zwischen dem Restgitter 18 und dem Blechteil 20 im Einzelnen beschriebenen Weise werden nacheinander sämtliche Verbindungsstege 23 an dem gemäß
Die
Die Umformorgane 24/1, 24/2, 24/3 der Umformstempel 11/1, 11/2, 11/3 besitzen dieselbe Querschnittsform wie das Umformorgan 24 des Umformstempels 11. Bei den Umformstempeln 11/1, 11/2, 11/3 handelt es sich folglich um sich verjüngende Werkzeugteile der Umformwerkzeuge 13/1, 13/2, 13/3. Den Umformstempeln 11/1, 11/2, 11/3 ist jeweils eine Umformmatrize 12 zugeordnet, wie sie in
In den
Ausweislich
Gemäß
Der Umformstempel 11/4 weist ein Umformorgan 24/4 auf, das ein freies Ende des Umformstempels 11/4 bildet und das sich längs der Hubachse 14 zu dem freien Ende des Umformstempels 11/4 hin verjüngt. Abweichend von den stempelseitigen Umformorganen 24, 24/1, 24/2, 24/3 besitzt das Umformorgan 24/4 einen dreiecksförmigen Querschnitt. Eine obere horizontale Begrenzungslinie des Dreiecksquerschnittes des Umformorgans 24/4 ist in
Anders als die Umformstempel 11, 11/1, 11/2, 11/3 bearbeitet der Umformstempel 11/4 einen Verbindungssteg 23 bei einem zum Druckumformen des Verbindungsstegs 23 ausgeführten Bearbeitungshub lediglich an einer Stelle. Auch der Umformstempel 11/4 wirkt zum Druckumformen eines Verbindungsstegs 23 mit einer Umformmatrize 12 der in
Bearbeitungen, wie sie mittels des Umformwerkzeugs 13/4 durchgeführt werden können, sind in den
In
An die Bearbeitung des in
Die Werkstückseite 36 des Umformorgans 24/4 ist bei der Bearbeitung des in
Die Verhältnisse gemäß
Darüber hinaus unterscheidet sich die Bearbeitungssituation gemäß
Ebenfalls abweichend von
An die Druckumformung an dem in
In
Gemäß
Zusätzlich zu der Umformeinheit 41 weist der Umformstempel 11/6 Wangen 42, 43 auf, welche gegenüber dem Umformorgan 24/6 des Umformstempels 11/6 längs der Hubachse 14 zu der nicht gezeigten Umformmatrize 12 hin vorstehen und dadurch Vorsprünge 44, 45 des Umformstempels 11/6 ausbilden.In addition to the forming
Zum Druckumformen eines Verbindungsstegs 23 werden das zuvor trennend bearbeitete Blech 15 und das Umformwerkzeug 13/6 relativ zueinander derart positioniert, dass bei einem von dem Umformstempel 11/6 zu der Umformmatrize 12 hin ausgeführten Bearbeitungshub der umzuformende Verbindungssteg 23 zwischen den Vorsprüngen 44, 45 des Umformstempels 11/6 zu liegen kommt. Am Ende des Bearbeitungshubs setzen die Vorsprünge 44, 45 des Umformstempels 11/6 mit ihren längs der Hubachse 14 voreilenden Stirnflächen auf der Auflagefläche 27 der Umformmatrize 12 auf. Der Überstand der Vorsprünge 44, 45 gegenüber dem Umformorgan 24/6 des Umformstempels 11/6 ist derart bemessen, dass bei Hub-Endposition des Umformstempels 11/6 das freie Ende des Umformorgans 24/6 an dem Umformstempel 11/6 von der Auflagefläche 27 der Umformmatrize 12 längs der Hubachse 14 einen Abstand aufweist, welcher der gewünschten Restdicke des druckumgeformten Verbindungsstegs 23 entspricht. In der Hub-Endposition übergreift der Umformstempel 11/6 den umgeformten Verbindungssteg 23 portalartig. Die Vorsprünge 44, 45 des Umformstempels 11/6 sind dem Verbindungssteg 23 nach Art von Portalstützen seitlich benachbart.For the pressure forming of a connecting
Der von dem Umformstempel 11/6 relativ zu der Umformmatrize 12 ausgeführte Bearbeitungshub ist kraftgesteuert. In die programmierbare numerische Steuerung der Werkzeugmaschine 1 ist zu diesem Zweck eine in den
Die Hubsteuerungsvorrichtung 50 umfasst eine Kraftmessvorrichtung 51, eine Auswertevorrichtung 52 sowie eine Betätigungsvorrichtung 53. Mittels der Kraftmessvorrichtung 51 wird der Betrag der Abstützkraft gemessen, mit welcher der Umformstempel 11/6 des Umformwerkzeugs 13/6 längs der Hubachse 14 an der Umformmatrize 12 abgestützt ist. In der Auswertevorrichtung 52 wird der gemessene Ist-Betrag der Abstützkraft mit einem in der Hubsteuerungsvorrichtung 50 hinterlegten Grenzbetrag der Abstützkraft verglichen. Erreicht der gemessene Ist-Betrag der Abstützkraft den vorgegebenen Grenzbetrag, so indiziert dies, dass der Umformstempel 11/6 längs der Hubachse 14 seine Hub-Endposition erreicht hat. Die Auswertevorrichtung 52 erzeugt daraufhin ein Schaltsignal für die Betätigungsvorrichtung 53. Aufgrund des von der Auswertevorrichtung 52 generierten Schaltsignals betätigt die Betätigungsvorrichtung 53 den Hubantrieb des Umformwerkzeugs 13/6 dahingehend, dass der zu der Umformmatrize 12 hin gerichtete Bearbeitungshub des Umformstempels 11/6 beendet und ein Rückhub des Umformstempels 11/6 in Gegenrichtung des Bearbeitungshubs eingeleitet wird.The
In
Auch der Bearbeitungshub des Umformwerkzeugs 13/7 gemäß
Zur Durchführung der Kantenbearbeitung dient eine Umformrolle 54, die in die obere Werkzeugaufnahme 9 an der Umformstation 6 der Werkzeugmaschine 1 eingewechselt wird. Die Umformrolle 54 wirkt bei der Bearbeitung der Blechteile eines zuvor trennend bearbeiteten Blechs mit einer in
Zur Durchführung der Kantenbearbeitung der unvollständig voneinander getrennten Blechteile des trennend bearbeiteten Blechs wird dieses mittels der Koordinatenführung 16 derart über die Werkstückauflage 17 der Werkzeugmaschine 1 bewegt, dass die gegen die Blechteile gepresste Umformrolle 54 längs der Kanten der Blechteile abrollt und dabei an den Kanten der Blechteile mittels der Umformflächen 56, 57 Schrägflächen (Fasen) erzeugt. Dabei werden die Ansätze der Verbindungsstege 23 an den Blechteilen ausgespart. In diesen Bereichen wird im Anschluss an die Kantenbearbeitung der unvollständig voneinander getrennten Blechteile beim Druckumformen der Verbindungsstege 23 mittels des Umformwerkzeugs 13/4 in der zu
Nach dem Druckumformen sämtlicher Verbindungsstege 23 eines bearbeiteten Blechs werden die Blechteile, in dem Beispielsfall gemäß
Bei Einsatz der Umformwerkzeuge 13, 13/1, 13/2, 13/3, 13/4, 13/6, 13/7 bleiben aufgrund der Geometrie der stempelseitigen Umformorgane 24, 24/1, 24/2, 24/3, 24/4, 24/6,24/7 an den Blechteilen keine oder allenfalls minimale Spuren der Verbindungsstege 23 zurück. Dies gilt für das Umformwerkzeug 13/4 jedenfalls dann, wenn das stempelseitige Umformorgan 24/4 gegenüber dem zu bearbeitenden Verbindungssteg 23 gemäß
Claims (16)
- A forming tool for pressure forming of a connector bridge (23), which is attached at the ends thereof to workpiece parts (18, 19, 20, 21, 22) and which connects the workpiece parts (18, 19, 20, 21, 22) to each other, which workpiece parts (18, 19, 20, 21, 22) are processing products of a separating processing of a plate-like workpiece, in particular a metal sheet (15), and each have a separating surface (33), in the transverse direction of which the connector bridge (23) extends,• having two tool parts which are assigned to opposite sides of the connector bridge (23) during pressure forming of the connector bridge (23) and which are movable relative to one another along a stroke axis (14) which extends in the transverse direction of the connector bridge (23) during pressure forming of the connector bridge (23),• wherein a first of the tool parts has a forming means (24/6, 24/7, 24/8) which at least partially forms a free end of the first tool part,• wherein the second tool part (12) has a bearing surface (27) for the connector bridge (23) which bearing surface (27) extends in the transverse direction of the stroke axis (14) and faces the free end of the first tool part, and• wherein the two tool parts are movable towards each other along the stroke axis (14) with a processing stroke into a stroke end position in which the forming means (24/6, 24/7, 24/8) of the first tool part and the bearing surface (27) of the second tool part (12) are spaced apart from each other along the stroke axis (14) by a distance, which during pressure forming of the connector bridge (23) is smaller than the extension of the connector bridge (23) to be formed along the stroke axis (14) and in which stroke end position the connector bridge (23) during pressure forming is supported on the bearing surface (27) of the second tool part (12),• wherein the bearing surface (27) of the second tool part (12) is formed as a continuous plane surface and, during pressure forming of the connector bridge (23), is located opposite the forming means (24/6, 24/7, 24/8) of the first tool part along the stroke axis (14) with a surface region which is aligned with the remaining bearing surface (27) of the second tool part (12) in the transverse direction of the stroke axis (14), and• wherein the first tool part has a projection (44, 45, 46, 47, 48, 49) which extends along the stroke axis (14) towards the second tool part and by means of which the two tool parts moved into the stroke end position are supported on one another, bypassing the connector bridge (23) along the stroke axis (14), in that the first tool part is of a portal-like shape comprising portal columns forming the projection (44, 45, 46, 47, 48, 49) and further comprising the forming means (24/6, 24/7, 24/8) arranged between the portal columns, wherein the first tool part engages over the connector bridge (23) in a portal-like manner during the pressure forming of the connector bridge (23) and, when the two tool parts are in their stroke end position, rests with the portal supports on the second tool part laterally beside the connector bridge (23).
- The forming tool according to claim 1, characterized in that the forming means (24/6, 24/7, 24/8) of the first tool part has a workpiece side (29, 30, 36, 39), which, during pressure forming of the connector bridge (23), faces one of the workpiece parts (18, 19, 20, 21, 22), and in that the forming means (24/6, 24/7, 24/8) of the first tool part extends on the workpiece side (29, 30, 36) along the stroke axis (14) parallel to the separating surface (33) on that workpiece part (18, 19, 20, 21, 22), to which the workpiece side (29, 30, 36) of the forming organ (24/6, 24/7, 24/8) faces during pressure forming of the connector bridge (23) or in that the forming means (24/7) of the first tool part on the workpiece side (39) extends along the stroke axis (14) at an angle relative to the separating surface (33) on that workpiece part (18, 19, 20, 21, 22), to which the workpiece side (39) of the forming means (24/7) faces during pressure forming of the connector bridge (23).
- The forming tool according to any of the preceding claims, characterized in that the first tool part is formed as a tapering tool part (11/6, 11/7), in that the first tool part has a forming means (24/6, 24/7) which tapers along the stroke axis (14) towards the free end of the first tool part.
- The forming tool according to claim 3, characterized in that the forming means (24/6, 24/7) of the tapering tool part (11/6, 11/7) has a workpiece side (29, 30, 36, 39) and a bridge side (31, 32, 37, 40), wherein, during pressure forming of the connector bridge (23), the workpiece side (29, 30, 36, 39) of the forming means (24/6, 24/7) faces one of the workpiece parts (18, 19, 20, 21, 22) and the bridge side (31, 32, 37, 40) of the forming means (24/6, 24/7) is remote from this workpiece part (18, 19, 20, 21, 22) and in that a forming surface (34, 35, 38) is provided on the bridge side (31, 32, 37) of the forming means (24/6, 24/7) which forming surface (34, 35, 38), starting from the free end of the tapering tool part (11/6, 11/7), extends along the stroke axis (14) away from the workpiece side (29, 30, 36) of the forming means (24/6, 24/7).
- The forming tool according to claim 3 or claim 4, characterized in that the forming means (24/6, 24/7) of the tapering tool part (11/6, 11/7) has a triangular cross-section or a trapezoidal cross-section in a sectional plane extending parallel to the stroke axis (14).
- The forming tool according to any of claims 3 to 5, characterized in that the forming means (24/6) of the tapering tool part (11/6) is formed by an end portion of the tapering tool part (11/6) provided with an inner cavity, preferably an inner cone (25).
- The forming tool according to any of the preceding claims, characterized in that the forming means (24/6) of the first tool part has portions which are offset relative to one another and by means of which the connector bridge (23) can be pressure-formed during pressure forming at a plurality of locations offset relative to one another along the connector bridge (23),• wherein the forming means (24/6) has a workpiece side (29, 30) and a bridge side (31, 32) at each of the portions thereof and• wherein the workpiece sides (29, 30) of the portions of the forming means (24/6) face different workpiece parts (18, 19, 20, 21, 22) and the bridge sides (31, 32) of the portions of the forming means (24/6) face away from different workpiece parts (18, 19, 20, 21, 22).
- The forming tool according to any of the preceding claims, characterized in that the forming means (24/6) of the first tool part extends in a circumferential direction, in particular arc-shaped, preferably along an arc of a circle, around the stroke axis (14).
- The forming tool according to claim 8, characterized in that the forming means (24/6) of the first tool part is endless in the circumferential direction.
- A machine tool having a forming tool (13/6, 13/7, 13/8) for pressure forming of a connector bridge (23), which is attached to workpiece parts (18, 19, 20, 21, 22) and which connects the workpiece parts (18, 19, 20, 21, 22) to one another, which workpiece parts (18, 19, 20, 21, 22) are processing products of a separating processing of a plate-like workpiece, in particular of a metal sheet (15), and each have a separating surface (33), in the transverse direction of which the connector bridge (23) extends, characterized in that the forming tool (13/6, 13/7, 13/8) provided is the forming tool according to any of claims 1 to 9.
- The machine tool according to claim 10, characterized in that the forming tool (13/6, 13/7, 13/8) for the two tool parts has a stroke drive having a stroke control device (50), which in turn comprises a force measuring device (51), an evaluation device (52) connected to the force measuring device (51) and an actuating device (53) connected to the evaluation device (52) of the stroke control device (50) and the stroke drive,• wherein by means of the force measuring device (51) of the stroke control device (50) during the processing stroke of the two tool parts of the forming tool (13/6, 13/7, 13/8) the amount of the supporting force can be measured with which the two tool parts are supported on one another via the projection (44, 45, 46, 47, 48, 49) extending along the stroke axis (14),• wherein by means of the evaluation device (52) of the stroke control device (50) the amount of the supporting force measured by means of the force measuring device (51) is comparable with a limit amount of the supporting force associated with the stroke end position of the two tool parts, and• wherein by means of the evaluation device (52) of the stroke control device (50), when the limit amount of the supporting force is reached or exceeded, a switching signal can be generated for the actuating device (53) of the stroke control device (50), based on which switching signal the actuating device (53) actuates the stroke drive of the forming tool (13/6, 13/7, 13/8) in order to terminate the processing stroke.
- A method for pressure forming of a connector bridge (23), which is attached at the ends thereof to workpiece parts (18, 19, 20, 21, 22) and which connects the workpiece parts (18, 19, 20, 21, 22) to each other, which workpiece parts (18, 19, 20, 21, 22) are processing products of a separating processing of a plate-like workpiece, in particular a metal sheet (15), and each have a separating surface (33), in the transverse direction of which the connector bridge (23) extends,• wherein two tool parts of a forming tool (13/6, 13/7, 13/8) are associated with opposite sides of the connector bridge (23) and are moved relative to one another along a stroke axis (14) which extends in the transverse direction of the connector bridge (23), wherein a first of the tool parts has a forming means (24/6, 24/7, 24/8), which at least partially forms a free end of the first tool part and wherein the second tool part (12) has a bearing surface (27) for the connector bridge (23) which bearing surface (27) extends in the transverse direction of the stroke axis (14) and faces the free end of the first tool part,• the connector bridge (23) being acted upon on one side by the forming means (24/6, 24/7, 24/8) of the first tool part and being supported on an opposite side along the stroke axis (14) by the bearing surface (27) of the second tool part (12), and• wherein the tool parts are moved towards one another along the stroke axis (14) with a processing stroke into a stroke end position in which the forming means (24/6, 24/7, 24/8) of the first tool part and the bearing surface (27) of the second tool part (12) are spaced apart from one another along the stroke axis (14) by a distance which, during pressure forming of the connector bridge (23), is smaller than the extension of the connector bridge (23) to be formed along the stroke axis (14), characterized in that the method is performed by means of the forming tool (13/6, 13/7, 13/8) according to any of claims 1 to 9 and/or by means of the machine tool (1) according to claim 10 or claim 11, wherein the connector bridge (23) is supported on the side remote from the forming means (24/6, 24/7, 24/8) of the first tool part by a bearing surface (27) of the second tool part (12) formed as a continuous plane surface, which bearing surface (27) is located opposite the forming means (24/6, 24/7, 24/8) of the first tool part along the stroke axis (14) having a surface region which is aligned with the remaining bearing surface (27) of the second tool part (12) in the transverse direction of the stroke axis (14).
- The method according to claim 12, characterized in that the method is performed by means of the forming tool (13/6, 13/7) according to claim 4, wherein, on the side of the connector bridge (23) associated with the tapering tool part (11/6, 11/7), material of the connector bridge (23) is plasticized by the forming means (24/6, 24/7) of the tapering tool part (11/6, 11/7) and plasticized material of the connector bridge (23) on the bridge side (31, 32, 37) of the forming means (24/6, 24/7) is displaced by the forming surface (34, 35, 38) of the forming means (24/6, 24/7) away from the workpiece side (29, 30, 36) of the forming means (24/6, 24/7).
- A method for the separating processing of plate-like workpieces, in particular for the separating processing of metal sheets (15), wherein two workpiece parts (18, 19, 20, 21, 22) are separated from each other,• in that the two workpiece parts (18, 19, 20, 21, 22) are firstly separated incompletely from one another, with a separating surface (33) being produced on each of the two workpiece parts (18, 19, 20, 21, 22) and with at least one connector bridge (23) being left in place, which connector bridge (23) is attached at the ends thereof to the workpiece parts (18, 19, 20, 21, 22), connects the workpiece parts (18, 19, 20, 21, 22) to one another, and extends in the transverse direction of the separating surfaces (33),• in that after the incomplete separation of the workpiece parts (18, 19, 20, 21, 22) the connector bridge (23) is pressure-formed and• in that the two workpiece parts (18, 19, 20, 21, 22) are subsequently completely separated from one another by releasing the connection made by the formed connector bridge (23), characterized in that, after the incomplete separation of the workpiece parts (18, 19, 20, 21, 22), the connector bridge (23) is pressure-formed according to the method according to claim 12 or claim 13.
- The method according to claim 14, characterized in that a plate-like workpiece, in particular a metal sheet (15), made of an elastically deformable material is processed in a separating manner, and in that the at least one connector bridge (23) is produced as a flexure hinge and is resiliently elastic in the transverse direction of the separating surfaces (33) of the workpiece parts (18, 19, 20, 21, 22) connected to one another by the connector bridge (23).
- A method for processing plate-like workpieces, in particular for processing metal sheets (15), wherein the workpiece is processed in a separating manner, characterized in that the workpiece is processed in a separating manner according to the method according to claim 14 or claim 15 and that after the incomplete separation of the workpiece parts (18, 19, 20, 21, 22) and before or after the pressure forming of the at least one connector bridge (23) connecting the workpiece parts (18, 19, 20, 21, 22) to one another and before the complete separation of the workpiece parts (18, 19, 20, 21, 22) at least one of the incompletely separated workpiece parts (18, 19, 20, 21, 22) is additionally processed, preferably additionally edge processed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP15165676.6A EP3088097B1 (en) | 2015-04-29 | 2015-04-29 | Devices and method for the pressure forming of connector bridges between parts of a board-shaped workpiece |
Applications Claiming Priority (1)
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EP15165676.6A EP3088097B1 (en) | 2015-04-29 | 2015-04-29 | Devices and method for the pressure forming of connector bridges between parts of a board-shaped workpiece |
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EP3088097A1 EP3088097A1 (en) | 2016-11-02 |
EP3088097B1 true EP3088097B1 (en) | 2020-07-29 |
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DE102022127687A1 (en) | 2022-10-20 | 2024-04-25 | TRUMPF Werkzeugmaschinen SE + Co. KG | Method for producing a reduced-thickness connecting web when cutting a workpiece part from a plate-like workpiece and associated control program product |
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JPS56134026A (en) * | 1980-03-25 | 1981-10-20 | Tsubakimoto Chain Co | Blanking method |
US5655401A (en) | 1995-11-13 | 1997-08-12 | Interbold | Tabbing tool and method |
JP3426453B2 (en) * | 1996-11-19 | 2003-07-14 | 新日本製鐵株式会社 | Easy openable lid with excellent can openability that does not require repair painting and method for producing the same |
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