EP2978546A1 - Bending tools for pre-bending and hemming - Google Patents
Bending tools for pre-bending and hemmingInfo
- Publication number
- EP2978546A1 EP2978546A1 EP14723672.3A EP14723672A EP2978546A1 EP 2978546 A1 EP2978546 A1 EP 2978546A1 EP 14723672 A EP14723672 A EP 14723672A EP 2978546 A1 EP2978546 A1 EP 2978546A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bending
- punch
- die
- section
- zudrückfläche
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005452 bending Methods 0.000 title claims abstract description 186
- 238000009957 hemming Methods 0.000 title abstract description 12
- 239000000463 material Substances 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 description 4
- 230000001154 acute effect Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003716 rejuvenation Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
-
- 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
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
- B21D5/0209—Tools therefor
-
- 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
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/16—Folding; Pleating
Definitions
- the invention relates to a bending die and a bending punch for v-shaped prebending and subsequent pressing a flat workpiece section according to the dependent claims of claims 1 and 8.
- Such reshaping is also referred to as folding or hemming and can also be made on a conventional press brake with suitable bending tools, also called folding tools or compression tools.
- the workpiece is pre-bent with sharp edges at one edge and then the resulting bending leg is pressed and formed against the remaining workpiece between two pressing surfaces.
- the bending tools used for this purpose have structural features which, in a first forming step, allow prebending of the workpiece, preferably by means of a free-bending operation, and in a second forming step, allow the pre-bent workpiece to be compressed. Since different effective surfaces are used on the bending tools, there are embodiments of Zudrücktechnikmaschinemaschineen in which the bending dies have relatively adjustable components or in which by changing the position of the bending die between the forming steps successively different active surfaces come into engagement.
- An embodiment of folding tools which has fixed bending tools with no movable or adjustable components relative to the respective tool holders on the press brake, comprises a bending die having on its upper side a bearing surface for a workpiece and in the bearing surface a die section into which the workpiece piece is pressed by means of the tip of a punch and thereby the workpiece can be pre-bent acute angle.
- the pre-bent workpiece is compressed between a punching surface formed on the punch and the bearing surface of the bending die.
- the Zudschreib printing on the punch is relative to the top of the punch relatively far back and in order to approach the Zudschreib construction up to the support surface of the bending die, the bending die in the die section has a leading into the interior of the bending die slot in which the punch during Zudschreibvorgang can be added.
- the punch is so far approximated to the bending die that between the Zudschreib vom a suitable for receiving the pre-bent workpiece slot remains and the workpiece is inserted into this so far until it abuts the punch.
- a disadvantage of this embodiment is that at larger Gesenkweiten through this creates a gap between the support surface at the top of the bending die and the introduced punch into which the workpiece can dodge while pressing and thus the proposed forming process can be disturbed sensitive, since the Zud Wegvorgang is performed insufficiently.
- bending dies with different die widths generally also require a separate stamping punch, each with a matching punch thickness, in order to avoid or minimize the above-mentioned intermediate space.
- a bending tool set for folding of different sheet thicknesses therefore comprises not only a plurality of bending dies with different die widths, but also a plurality of punch dies with different punch thicknesses, which accordingly causes high initial costs for such a tool set, and a change between workpieces with different sheet thicknesses is also associated with a large set-up effort.
- the object of the invention is to avoid the disadvantages of the known from the prior art bending tool combinations.
- the object of the invention is achieved by a generic bending die with the characterizing features of claim 1 and a punch with the characterizing features of claim 8. Characterized in that at the bending die the Zudschreib construction over a support surface of the Gesenkabitess recessed and thus formed from the support surface to the Zudschreib Construction stop surface is formed, one of the execution of the die width and the thickness of the punch uninfluenced, optimal Zudschreib construction on the bending die, whereby a high quality rebate forming during Zupressruckvorgang is ensured. Furthermore, a plurality of such bending dies, which have different die widths, can be used with one and the same punch, without affecting the result of the pressing operation.
- a possible embodiment of the bending die is that the slot for receiving the bending punch adjacent to the outer die portion has a support portion with a clear span corresponding to the thickness of the punch plus a slight clearance.
- the relatively slender part of the punch is thereby mechanically supported during Zudrückvorgang and ensures the mutual alignment of the bending die and punch transverse to the direction.
- the clear span in the support section is constant over a range, i. level support surfaces are provided in the support section.
- a receiving contour adjoining the support section can widen in the direction of an inner end section of the slot, that is to say have an increased inside width relative to the support section, whereby wear of the bending punch in the region of the tip is reduced.
- a receiving contour adjoining the support section is rounded in the inner end section of the slit with rounding radii or a radius of curvature of at least 2 mm. If the closing surface is carried out between 30% and 75% of the die width in relation to the contact surface, the size of the stop surface will be sufficient for the sharp-edged workpiece.
- a load-appropriate, material and weight-saving embodiment of a bending die is achieved if, on the side opposite the pressing section, with respect to the working plane, it has a material cross-section tapering towards the die section.
- the die section and the pressing surface are surface-hardened, in particular laser-hardened.
- the Zud Wegabites is disposed completely between the working plane of the punch portion and an emanating from the top of the punch portion, inclined by an angle less than 20 ° to the working plane contour plane. Since the bending punch can also be used for free-bending transformations without subsequent pressing-in operation, in this Guiding form of Zud Wegabites no disturbing contour that limits the bending space.
- the tip of the stamp section and the pressing surface are surface-hardened, in particular laser-hardened.
- the invention further relates to a combination of a bending die according to the invention and a bending punch bending tool combination according to claim 12 for v-shaped pre-bending and subsequent pressing a flat workpiece section, whereby the above-described advantageous effects of a bending die and a bending punch according to the invention can be optimally utilized.
- the invention also relates to a bending tool set according to claim 13, for v-shaped pre-bending and subsequent pressing of a flat workpiece section, comprising one or more punch with a constant punch thickness transversely to the working direction and at least two bending dies with leading into the interior of the bending dies slots for receiving the Bending punch during compression and Gesenkab- sections which have different Gesenkweiten in the region of their support surface for a flat workpiece section.
- Fig. 1 is a known from the prior art, generic bending tool combination
- Fig. 2 shows a bending tool combination according to the invention comprising bending die and
- FIG. 3 shows a bending tool set according to the invention, comprising a bending punch and a plurality of bending dies with different die widths;
- Fig. 4 shows a detail of a bending die according to the invention with several alternatively or additionally possible embodiments and
- Fig. 5 shows a detail of a bending punch according to the invention with several alternative or additionally possible execution features.
- Fig. 1 shows a known from the prior art bending tool combination for pre-bending and pressing a flat workpiece section.
- the bending tool combination comprises a bending die having on its upper side a support surface for the workpiece and in the support surface a die portion into which the workpiece is pressed by means of the tip of a punch and thereby the workpiece can be pre-bent acute angle.
- the pre-bent workpiece is compressed between a punching surface formed on the punch and the bearing surface of the bending die.
- the phase of compression is shown.
- the Zudschreib the bending punch is relative to the top of the punch relatively far back added connects directly at right angles to the stamp section.
- the bending die in the die section has a slot leading into the interior of the bending die, in which the bending punch can be received during the pressing operation.
- the punch is so far approximated to the bending die that the punch portion protrudes into the slot and thereby forms the shaft of the punch portion a stop surface for the pre-bent workpiece and thereby positioning the pre-bent workpiece between the printing surfaces.
- a larger die width may be required to facilitate or even allow pre-bending.
- undesirable deformations of the workpiece can occur, in particular the Zudrückvorgang can bring an inadequate result.
- FIG. 2 shows a bending tool combination 1 comprising a bending die 2 according to the invention and a bending punch 3 according to the invention.
- bending die 2 and punch 3 are mounted in a bending press, not shown, in particular a press brake and thereby arranged relative to each other in the direction of a working plane 4 adjustable.
- the upper side of the bending die 2 forms a bearing surface 5 on which a flat, planar workpiece section 6 can be placed in order to pre-bend it in sharp-edged form by means of the bending punch 3.
- the bending die 2 has, in the region of the bearing surface 5, a recessed die section 7, into which the workpiece section 6 can be pressed during the deformation by the bending punch 3.
- the die section 7 is arranged centrically with respect to the working plane 4 and merges into a slot 8 in the interior of the bending die 2, in which the bending punch 3 is received when the pre-bent workpiece section 6 is pressed in.
- a Zudschreibabites 9 is arranged with a transverse to the working plane 4 Zudschreib construction 10 on which a pre-bent workpiece for carrying out the Zudschreibvorgangs can be positioned.
- the bending punch 3 cooperating with the bending die 2 has a punch portion 12, which extends from a punch base 11 and is centrally arranged with respect to the working plane 4, which in its end portion tapers in a wedge shape onto a punch tip 13.
- a Zudschreibabêt 14 of the punch 13 is laterally arranged next to the punch portion 12 on the punch base 11, which has a transverse to the working plane 4 Zudschreib Chemistry 15.
- the Zudschreib simulation 10 staggered back on the bending die 2 relative to the support surface 5 of the die portion 7, whereby an extending from the support surface 5 to Zudschreib Construction 10 stop surface is formed.
- the stamping section 14 projects beyond the stamp base in the direction of the stamp tip 13 on the bending punch 3 according to the invention, whereby the stamping surface 15 is raised stepwise relative to the stamp base and a groove-like recess is formed between the stamp section 12 and the stamping surface 15.
- the bending die 2 has in Gesenkabrough 7 a die width 16 which is adapted to the sheet thickness to be processed, with larger sheet thickness 16 are used with increasing sheet thickness.
- the stamp portion 12 of the punch 3 has a punch thickness 17 and the slot 8 in the bending die 2 is designed so that the punch portion 12 can be received with a small clearance, for example, a few tenths of a millimeter during Zudrückvorgang.
- FIG. 3 shows a bending tool set 18 comprising a bending punch 3 according to the invention and three different bending dies 2, 19, 20. Deviating from the illustrated embodiment, the bending tool set 18 may also comprise only two bending dies or else more than three bending dies.
- the bending dies 2, 19 and 20 have different die widths 16, 21 and 22 and are therefore suitable for bending workpiece sections 6 with different sheet thicknesses.
- the bending die 2 with the smallest die width 16 is used, while for larger sheet thicknesses the bending die 19 with the larger die width 21 or even the bending die 20 with the largest die width 22 is used.
- all three bending dies 2, 19, 20 have slots 8 adjoining the die portion 7, which have a support portion 23 adjoining the die portion 7, which in all different bending dies 2, 19 and 20 has an identical clear span 24.
- This clear span 24 corresponds to the punch thickness 17 plus a low working cycle. With a punch thickness of 6 mm, the clear span is for example 6.2 or 6.4 mm.
- This support portion 23 in the slot 8 causes the punch portion 12 is supported transversely to the working plane 4 in a Zud Wegvorgang, in which very large forming forces may be required and thereby deformation or breakage of the stamp portion 12 is reduced or prevented.
- a depth offset 26 of the Zudschreib simulation 10 relative to the support surface 5 is preferably between 30% and 75% of the Gesenkweite 16 and Fig. 4 shows an embodiment with a depth offset of about 50% of the Gesenkweite 16th
- the stop surface 25 preferably runs parallel to the working plane 4 and, as indicated in Fig. 4, between the stop surface 25 and the Zudschreib construction 10 a groove 27 may be provided which can absorb slight contamination in Zudschreibabêt 9 and therefore striking a workpiece to be bent portion. 6 against the stop surface 25 or resting on the Zudschreib construction 10 is not hindered by contamination.
- FIG. 4 further shows that the slot 8 leading from the die section 7 into the interior of the bending die 2, following the die section 7, has the support section 23, in which the support width 24 is at least approximately constant.
- To the support portion 23 includes a receiving contour 28, which widens in the direction of the inner end portion 29 of the slot 8, whereby in the interior of the slot 8 is compared to the span 24 enlarged inner width 30 is given.
- the inner contour 28 is rounded in the end section 29 of the slot 8 and, for example, has a radius of curvature of at least 2 mm. Thereby, a strength-reducing notch effect can be reduced by the slot 8.
- FIG. 5 shows in a detail detail the stamping section 12 and the pressing section 14 of a bending punch 3 according to the invention, in which the pressing section 14 protrudes in the direction of the stamp tip 13 with respect to a stamp base surface 32.
- a groove-like recess 33 is thereby formed between the stamp portion 12 and the Zudschreib Chemistry 15 and projects the Zudschreib Chemistry 15 stepwise relative to the stamp base surface 32.
- the projection 34 of the Zudschreibabiteses 14 relative to the stamp base surface 32 is made larger than the depth offset 26 on the bending die 2, so that the Zudschreib vom 10 and 15 can be brought to the mutual concern.
- Another condition for being able to bring the pressing surfaces 10 and 15 into contact is that a punch length 35 measured at the bending punch 3 from the pressing surface 15 to the punch tip 13 is made smaller than a slot depth measured at the bending die 2 from the pressing surface 10 Since the Umform torque required for a Zudgurvorgang can be very large, in particular greater than the Umform manager required for pre-bending, it is advantageous if the Zudschreib construction 15 measured at the punch 3 transversely to the working plane 4 has a larger dimension 37 as the punch thickness 17.
- An advantageous embodiment of a bending punch 3 according to the invention can, as in
- Fig. 5 also consist in that the Zudschreibabites 14 is disposed completely between the working plane 4 of the punch portion 12 and an outgoing from the punch tip 13 contour plane 38, wherein the contour plane to the working plane as small as possible angle 39, for example, less than 20 ° assumes, whereby the Zudschreibabites 14 also for sharp-edged Vorbiegungen a workpiece section 6 is no interference contour.
- FIGS. 4 and 5 form the subject of independent solutions according to the invention.
- the relevant objects and solutions according to the invention can be found in the detailed descriptions of these figures.
- Stamp section 32 stamp base surface
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA50217/2013A AT513741B1 (en) | 2013-03-28 | 2013-03-28 | Bending tools for pre-bending and pressing |
PCT/AT2014/050076 WO2014153586A1 (en) | 2013-03-28 | 2014-03-27 | Bending tools for pre-bending and hemming |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2978546A1 true EP2978546A1 (en) | 2016-02-03 |
EP2978546B1 EP2978546B1 (en) | 2017-04-19 |
Family
ID=50721508
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14723672.3A Active EP2978546B1 (en) | 2013-03-28 | 2014-03-27 | Bending tools for pre-bending and hemming |
Country Status (4)
Country | Link |
---|---|
US (1) | US9868144B2 (en) |
EP (1) | EP2978546B1 (en) |
AT (1) | AT513741B1 (en) |
WO (1) | WO2014153586A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015199122A (en) * | 2014-04-01 | 2015-11-12 | 株式会社アマダホールディングス | Press brake mold and hemming processing method |
CN110076251B (en) * | 2019-05-10 | 2024-05-10 | 瑞鹄汽车模具股份有限公司 | Automobile panel inner and outer plate pre-bending and press-fit edge-wrapping combined die and application method thereof |
CN112828140A (en) * | 2021-01-06 | 2021-05-25 | 安徽省科昌机械制造股份有限公司 | Refrigerator inner bag tip pressure platform mechanism of bending |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1132633A (en) | 1955-09-05 | 1957-03-13 | Promecam Soc | Improvements to press brakes |
FR1163931A (en) | 1956-11-05 | 1958-10-02 | Carrier Soc | Tools for press brake |
DE2652886A1 (en) * | 1976-11-20 | 1978-05-24 | Weinbrenner Paul Maschbau | Sheet material folding tool - has lower part of auxiliary punch movable relative to main punch and guided by pin engaging in slots |
CH655874A5 (en) * | 1982-06-07 | 1986-05-30 | Haemmerle Ag Maschf | TOOL DEVICE ON A BENDING PRESS. |
DE3638083C2 (en) * | 1986-11-07 | 1994-04-07 | Siemens Ag | Bending punch |
US4805438A (en) * | 1987-03-05 | 1989-02-21 | Metal Building Components Incorporated | Hemming die fixture for metal presses |
JPH01271011A (en) * | 1988-04-22 | 1989-10-30 | Osamu Makino | Tool for press bending work |
US4852379A (en) * | 1988-07-15 | 1989-08-01 | Nat Levenberg | Metal forming methods and products formed thereby |
US5750603A (en) | 1997-05-23 | 1998-05-12 | Solutia Inc. | Polymer-bound non-halogen fire resistant compositions |
AT505656B1 (en) * | 2008-02-19 | 2009-03-15 | Trumpf Maschinen Austria Gmbh | FOLDING DEVICE FOR A BENDING PEG, IN PARTICULAR BUTTING PRESSURE |
AT507911B1 (en) * | 2009-03-04 | 2010-11-15 | Trumpf Maschinen Austria Gmbh | METHOD FOR LYING |
CN101665515B (en) | 2009-10-20 | 2013-05-08 | 苏州科技学院 | P-N collaborative type flame-retardant compound and preparation method thereof |
-
2013
- 2013-03-28 AT ATA50217/2013A patent/AT513741B1/en active
-
2014
- 2014-03-27 WO PCT/AT2014/050076 patent/WO2014153586A1/en active Application Filing
- 2014-03-27 US US14/780,117 patent/US9868144B2/en not_active Expired - Fee Related
- 2014-03-27 EP EP14723672.3A patent/EP2978546B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
WO2014153586A1 (en) | 2014-10-02 |
AT513741A4 (en) | 2014-07-15 |
EP2978546B1 (en) | 2017-04-19 |
US9868144B2 (en) | 2018-01-16 |
AT513741B1 (en) | 2014-07-15 |
US20160096213A1 (en) | 2016-04-07 |
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