WO2012045701A1 - Procédé de fabrication de composants coniques dans un procédé d'emboutissage profond et composants ainsi fabriqués - Google Patents

Procédé de fabrication de composants coniques dans un procédé d'emboutissage profond et composants ainsi fabriqués Download PDF

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Publication number
WO2012045701A1
WO2012045701A1 PCT/EP2011/067226 EP2011067226W WO2012045701A1 WO 2012045701 A1 WO2012045701 A1 WO 2012045701A1 EP 2011067226 W EP2011067226 W EP 2011067226W WO 2012045701 A1 WO2012045701 A1 WO 2012045701A1
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WO
WIPO (PCT)
Prior art keywords
tool
die
machining tool
roller
circumference
Prior art date
Application number
PCT/EP2011/067226
Other languages
German (de)
English (en)
Inventor
Tom Walde
Philipp Alexander Strehler
Bruno Bigler
Original Assignee
Adval Tech Holding Ag
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Adval Tech Holding Ag filed Critical Adval Tech Holding Ag
Priority to EP11764182.9A priority Critical patent/EP2624979A1/fr
Publication of WO2012045701A1 publication Critical patent/WO2012045701A1/fr

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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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/30—Deep-drawing to finish articles formed by deep-drawing
    • 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
    • B21D51/00—Making hollow objects
    • B21D51/02—Making hollow objects characterised by the structure of the objects
    • B21D51/10—Making hollow objects characterised by the structure of the objects conically or cylindrically shaped objects

Definitions

  • the present invention relates to a chipless process for the production of at least partially tapered components made of sheet metal. Furthermore, it relates to components produced using this method and tools for carrying out the method.
  • a conically tapering section of the rotationally symmetrical component is to be understood as meaning a section in the axial direction in which the circular peripheral wall forming the component in this area tapers, i. along the axial direction with increasingly smaller radius is formed.
  • the conically tapering section can form a straight line in an axial section through the component (linearly increasing circle radius as a function of the axial coordinate, ie in the sense of the lateral surface of a straight circular truncated cone), but it can also form a curved shape (non-linear increasing circle radius as a function of the axial coordinate, curved, for example, trumpet-shaped).
  • the component rotation may be symmetrical, but need not.
  • the component axially even outside of the tapered axial portion even very specifically over example projecting tabs, have holes or the like, so that the component for machining in the second step, as defined below, is rotatably held in the die.
  • the invention generally relates to a non-cutting calibration method for conical and approximately conical shapes in deep-drawn parts.
  • conical tapering range allows a shape tolerance of 0.05 mm or less, preferably 0.03 mm or less.
  • the present invention relates to a method for producing a tapered at least in an axial section, rotationally symmetrical component of a flat sheet metal section, which is characterized according to the invention in that in a first step, a flat sheet metal section in a deep drawing process between a first die and a Stamp is formed such that in at least one axial portion, a tapered portion is formed, and in a second step, this at least one tapered portion of a non-machining rework between a second die and a rotating about the axis of symmetry machining tool, which tapered Area is only at one or more, distributed around the circumference, charged in substantially line-shaped areas, edited.
  • the line-shaped region extends over the entire axial extent of the tapered region.
  • the line-shaped area is arranged such that the line of loading by the tool and the axis of symmetry lie in one plane. But it is also possible that the line of loading is arranged by the tool at an angle to the axis of symmetry.
  • the total contact pressure in the second step can be kept within a range of 10-100 kN, ie much lower than in an embossing tool.
  • other components with different material properties also arise in the machined tapered region.
  • the above-described process step of embossing is to be replaced by a rolling process.
  • the area to be calibrated no longer has to be made to flow at the same time over the entire area, but only linear areas are loaded, as a result of which the requisite forming forces are significantly reduced.
  • conical elements are in a stamp, or on the outside opposite surface of the die (kinematic reversal).
  • a stamp with such elements is immersed in the cone to be rolled, which is located in a corresponding die (die).
  • the conventional die is immersed in the cone to be rolled, which is located in the corresponding die with elements.
  • this (or the die) begins to rotate and the material begins to contact the contact surface flow, whereby the desired shape change is achieved.
  • the rotation of the roller burnishing tool can already begin, if this is not completely submerged.
  • this is characterized in that the second die surrounds the conically tapering region circumferentially adjacent to the outside in the second step (that is, to some extent forms a pot-shaped cavity, with or without bottom), and that the machining tool is in engages the tapered interior and rotated in the second step by a rotation angle.
  • the tool preferably rotates by at least 360 °. If a plurality of such load areas are distributed around the circumference, this means that the tool rotates at least by the corresponding fraction of the circumference. Preferably, at least one and a half times as much is rotated around the circumference to ensure that the entire area is swept over.
  • a stamp element forming the rotating machining tool
  • the conventional manner as a die designated the stamp completing element Under a die according to claim 1 is thus generally not only a shaping element, which surrounds the component on the outside, to understand, but also a die, which works on the component fitting on the inside.
  • the second die then surrounds the conically tapering region circumferentially on the inside in the second step, and the machining tool engages around the tapered outer region and in the second step rotates through a rotation angle such that the entire circumference of the tapered region is at least once linear was charged.
  • This offers in particular the possibility to store the frustoconical rollers consuming, because you usually has more installation space available for this purpose.
  • a further preferred embodiment is characterized in that, in a step preceding the first step, the sheet metal section is punched from a sheet metal (for example plate or sheet), preferably this upstream step and the first and the second step are carried out on the same press.
  • the sheet can be supplied as a band or in the form of discrete elements.
  • the tapered rollers are mounted in the die respectively in the die so that they can rotate about their own axis during the rolling process.
  • the angle of the cone of the rollers is ideally chosen such that they can roll substantially without slippage over the surface of the cone to be produced.
  • the machining tool is thus preferably a tool in which at least one cylindrical or truncated-cone-shaped roller is arranged on the side facing the conically tapered area (in the case of a cavity designed as a cavity), preferably at least or exactly 3, more preferably at least or exactly 5 or at least or exactly 7 such rollers are arranged around the circumference, preferably uniformly distributed.
  • the machining tool is accordingly a die tool in which at least one cylindrical or truncated cone-shaped roller is arranged on the inside facing the conically tapered region, preferably at least three, particularly preferably at least 5 or at least 7 such rolls around the circumference Preferably evenly distributed, are arranged
  • rollers are furthermore preferably rotatably supported in the machining tool about their axes of symmetry in such a way that, in the second step of the method, they roll at least partially on the surface of the conically tapered region, preferably substantially without slippage.
  • the conically tapered region is formed as a lateral surface of a straight truncated cone, this can be ensured substantially or approximately slip-free rollers by an appropriate dimensioning of the rollers.
  • the at least one roller is formed as a truncated cone with a second ⁇ ffhungswinkel aj and a second small radius r 1 ⁇ and for an approximately or substantially slip-free processing of the second opening angle according to the formula
  • the rollers can be rotatably supported in the machining tool as explained above.
  • the rollers can also be firmly fixed in the machining tool (for example, welded or soldered in), and moreover, they can not be configured as full rollers, but rather as corresponding convex contact sections only in the contact areas.
  • the "rollers" can also be firmly mounted in the punch or on the die - for example by soldering
  • the "rollers” can also be firmly mounted in the punch or on the die - for example by soldering
  • the machining tool can therefore generally also be a tool in which at least one ironing element is disposed on the outside or inner side facing the conically tapering region during the kinematic exchange, which has an ironing edge, which is preferably in Rotational direction of the machining tool to the front has a Entreckwinkel in the range of 5-40 °, particularly preferably in the range of 10-20 °. Again, preferably at least three or exactly three, more preferably at least 5 or exactly 5 or at least 7 or exactly 7 such Abhallemente, preferably evenly distributed around the circumference of the tool arranged.
  • the method is possible, according to the said kinematic permutation, if the necessary relative movement between part and forming elements is not realized by a rotation of the punch, but by another type, such as by a rotation of the part or the die.
  • the sheet metal section is a sheet metal section or based on tantalum, tungsten, copper, iron, aluminum, or their alloys, preferably steel, in particular based on or from deep-drawn steel, in particular from a high-strength thermoforming steel, particularly preferably of the type 1.4301 , 1.4303, 1.4016, HC 420, HC 340, DC04.
  • the second process step can generally be followed by further processing steps, in particular further non-cutting or machining operations, surface treatment steps, in particular surface coatings.
  • further processing steps in particular further non-cutting or machining operations, surface treatment steps, in particular surface coatings.
  • surface treatment steps in particular surface coatings.
  • the present invention relates to a manufactured using such a method component, that is, at least partially conically tapered, rotationally symmetric component manufactured by such a method.
  • the present invention also relates to a machining tool for carrying out such a method, which is characterized in that the machining tool has a rotatably mountable in a press tool holder over which the machining tool is rotated in the second step of the method in the die, wherein the holder at least one, preferably a plurality of distributed around the circumference receiving recesses for Preferably rotatable mounting of each having a cylindrical or truncated cone-shaped roller, and wherein the roller is preferably mounted on the side facing away from the die via a rotary member, preferably at least one ball, which ball on the side facing away from the roller via a support member, preferably in Shape of a ring, and in this preferably in a recess or a circumferential groove, is held.
  • the tapered portion of the component to be machined is formed as a lateral surface of a straight truncated cone with the definitions given above, is preferably in such a machining tool, the at least one roller, in a plurality of rolls all, designed as a truncated cone with a second ⁇ ffhungswinkel as defined above , and also then the second opening angle of the roller (s) according to the formula
  • At least one ironing element is provided which has an ironing edge which preferably has a draft angle in the direction of rotation of the machining tool in the range of 5-40 °, particularly preferably in the range of 10 °. 20 °.
  • at least two, in particular preferably at least three or at least four, such ironing elements, preferably uniformly distributed around the circumference, are arranged.
  • the tool is accordingly a tool in which at least one ironing element is arranged on the inner side facing the conically tapering region, which has an ironing edge which preferably has a draft angle ( ⁇ ) in the direction of rotation of the processing tool towards the front side Range of 5-40 °, particularly preferably in the range of 10-20 °, wherein preferably at least three, more preferably at least 5 or at least 7 such Abrowlemente, preferably uniformly distributed around the circumference, are arranged.
  • ⁇ draft angle
  • the present invention also relates to a press tool, which is characterized in that on a common press with synchronous stroke and automatic conveying of the components between the processing stations a punching tool with die and punch, followed by at least one thermoforming tool (forming tool) with die and punch, and downstream of a RoUierwerkmaschine for performing a method mentioned above, preferably with a machining tool as indicated above and defined arranged ,
  • Figure 2 shows the rolling head in a perspective view inserted into the die.
  • Fig. 3 different possible components with conical sections, wherein in a) a cup-shaped member is shown with closed bottom, in b) a cup-shaped member with a stepped bottom and cylindrical portion is shown in c) a component analog b) but shown with bottom opening is, in d) a component with through-hole and curved conical
  • FIG. 4 shows a further embodiment with Abumblendem curling, wherein in a) the tool in a side view, in b) the tool in plan according to BB of Figure 4a, in c) the tool in an axial section along AA in b), in d 4), the tool in a perspective view inserted into the die, in f) a detail view from the view according to d) and in g) a further enlarged view from the view according to f ) is shown; and
  • Fig. 5 shows another embodiment with rolling, wherein in a) the rolling head in a perspective view inserted into the die, in b), the tool in an axial section along AA in c) the tool is shown in plan view.
  • FIG. 1 shows the individual processing steps in the individual processing stations of a press tool.
  • a plan view of the tool is shown at the top and an axial section at the bottom as defined above with A-A.
  • On the far left is the process of punching the board, in the middle of the step of deep drawing, and on the far right (c) the rolling.
  • a blank 1 becomes a blank, i. a circular sheet metal section 4, prepared by the sheet is guided on a die 3 and then from above a punch 2 is guided on this die 3 concentric with a recess in the punch 2 so that in consequence of the shear forces between the peripheral edge of the punch. 2 and the peripheral upper edge of the recess in the die 3, the blank 4 is punched out and, for example, down from the tool is removed or (for example sucked on the stamp 2) in an upward movement of the punch is discharged upward to the next processing station is transferred.
  • this board is now placed concentrically to a cup-shaped depression in a further die 5 on this and then a thermoforming punch 7 from above concentrically down to this recess in the die 5, resulting from the board 4, the actual Forming part with a conical region 15 forms.
  • roller burnishing tool 24th comprises a roller head holder 10, around the circumference distributed around three roller burnishing rollers 11 are stored.
  • roller burnishing rollers 11 are designed as truncated cones, with a lower radius than at the top. They are inserted in corresponding recesses in the rolling head 10 from above.
  • These Au receiving recesses 26 for the roller burnishing rollers 11 in the Rollierkopfhalterung are designed so that they surround the roller burnishing rollers by more than 180 degrees in the circumferential direction, ie due to the tapered formation of the Aufhahmeausnaturalept 26, the roller burnishing rollers 11 inserted from above into these recesses 26 are and are then secured in this down. They are rotatably mounted correspondingly slidably in these receiving recesses 26.
  • This Rollierwalzen 11 must be able to be pressed down in a rotatably mounted manner, accordingly, a ring 13 is disposed above the Rollierkopfhalterung 10.
  • this ring 13 depressions or a circumferential groove are arranged on the underside in the over the rollers 11 cross-section.
  • a support ball 12 is placed in each case, as can be seen in particular in the lower part of FIG.
  • each roll 11 is rotatably mounted around its own axis of symmetry in the burnishing head 24, whereby it is mounted on the one hand sliding in the receiving recess 26 and on the other hand in the sense of a ball bearing up over the ball 12. It is also possible in the receiving recess 26 to provide an additional needle bearing or the like, but usually sufficient lubrication is sufficient to ensure that the rollers 11 are sufficiently freely rotatably mounted in the Rollierkopfhalterung 10.
  • the entire rolling head 24 is mounted rotatably about a rotation axis 21 in the tool. As soon as the roller burnishing head 24 is inserted sufficiently deep into the cavity in the forming part 9 (or even before), the rolling head 24 begins to rotate about the rotation axis 21.
  • FIG. 2 shows such a processing head 24 inserted in the die 8 Position in a perspective view. It can be very well recognized here that evenly distributed around the circumference three such processing rollers 11 are distributed. In order to ensure that the entire circumference of the conical region 15 is reliably covered in this machining step and therefore made precise, the machining head 24 should be rotated about the axis 21 by at least 120 degrees. Typically, at least once is rotated completely around this axis, so that the surface is processed three times by one of the rollers 11. But it is also possible to rotate with imported tool to a larger orbital angle.
  • FIG. 3 shows different possible component geometries that can be made using such a method.
  • FIG. 3 a shows a simple cup-shaped geometry with a closed base 16, which has a circular, upwardly projecting conical region 15 that tapers upwards.
  • Aperture angle ⁇ 2 is generally defined as the angle between the
  • the proposed method can also be used in connection with more complex forms.
  • stepped components which are also rotationally symmetrical, at least in the conically tapered region 15.
  • a further example of this is shown in Figure 3b. Adjacent to such a tapered region 15 cylindrical portions 18 can here in the sense an upper edge may be arranged, and the bottom portion 16 may have additional recesses 17. Typically, the formation of the structures takes place 17 resp. 18 in a pre-rolling process.
  • the bottom of such a component need not be closed, but a passage opening 19 may also be present.
  • the rolling step measures it may be advantageous to provide for the rolling step measures that the workpiece to be machined in the die 8 can not rotate. For example, this can be done by drilling in the work piece, or by the rotational symmetry in other way interrupting elements such as ribs, extensions or recesses.
  • these structures which enable the holder should not be arranged in the conically tapered region 15.
  • Figure 3d shows another possible component.
  • the tapered portion is curved, i. the radius does not decrease linearly from top to bottom as a function of the axial position.
  • Such conically tapering regions can also be reworked to a high precision by a proposed rolling step, the outer surface of the corresponding roll 11 simply has to be correspondingly adapted, as is the corresponding contact surface on the die 8.
  • FIG. Figure 4a shows a corresponding machining tool in a lateral view
  • Figure 4b in a plan view
  • Figure 4c in an axial section A-A as defined in Figure 4b
  • Figure 4d in a section perpendicular to the axis of rotation 21, i. along the line B-B in Figure 4a in Figure 4d.
  • Figure 4e A perspective view is shown in Figure 4e.
  • the machining tool 24 has a roller head holder 10, which faces over its peripheral surface at its the workpiece to be machined Circumferential surface, which is conical down, distributes three ironing elements 20. These do not rotate about their own axis, but rather scraping on the surface of the conically tapered region of the workpiece 9, if the rolling head 24 about the rotation axis 21 in the direction of rotation according to arrow 22 is rotated.
  • the ironing elements 20 firmly embedded in the head 10 in this case have an ironing edge 23 which comes into contact with the inner surface of the conical region 15, in a manner that to some extent before this ironing edge 23 (in the direction of rotation 22) a part of the material of Workpiece is pushed in front of him.
  • the distance between the ironing edge 23 and the wall of the die is less than the material thickness according to the usual Abstreck compiler. This leads to a particularly high precision of the final conical region 15.
  • the Entreckwinkel ß i. the angle formed by the leading edge of the edge 23 and the tangent at the point of contact is within a range as stated above.
  • FIG. 5 shows a further exemplary embodiment with rolling, wherein now the above-mentioned kinematic exchange is shown.
  • the stamp on the roller burnishing, but it is a conventional stamp, denoted by reference numeral 35 having a circumferentially tapered processing surface 33.
  • a die here is a processing train with roller burnishing rollers 11 is arranged.
  • This machining tool is designed as a die 30, wherein this die 30 rotates in this embodiment and the punch 35 does not rotate. But it is also possible to operate such a shape that the die 30 does not rotate and only the punch 35 rotates, it must simply be ensured that the machined conical member 14 is machined circumferentially, i. When the die 30 rotates, it must be ensured that the component 14 remains stationary with the punch 35 and not co-rotated, and likewise, if the die 30 remains stationary, it must be ensured that the workpiece 14 rotates with the punch 35.
  • the rotating die 30 has in this case three tapered and uniformly distributed around the circumference receiving recesses 26 for the frusto-conical rollers 11.
  • the rollers are on the one hand on the bottom over a first lower Lagerangskugel 12 a stored, this is mounted in a corresponding recess in the bottom of the blind hole portion of the receiving recess 26.
  • the upper ball 12b is supported upwardly by a circumferential ring 31 which has a receiving recess for the ball 12b on the underside.
  • the ring 31 has a central passage opening 32, which is designed so that the punch 35 can penetrate through this fürgangsöffhung in the die.
  • the method improved the roundness of the deep-drawn part in the conical region from 0.05 mm to 0.02 mm.
  • an improvement in the straightness could be achieved, namely of about 0.02 mm on average to values of less than 0.005 mm. This with a lower diameter of about 37mm and a cone angle of 15 ° (half cone) or 30 ° (full cone).
  • Table 2 Comparison of different surface features of a non-rolled reference part and two parts with different process parameters following the deep drawing of rolled parts for the material 1.4301.
  • the process offers the possibility of structuring surfaces in a targeted manner. This can be achieved both by structuring the rolls and by structuring the die or the stamp.
  • the wall thickness of the part in the conical region is usually not uniform, but it is at the open end of the conical region slightly larger than the closed end. It has proved to be advantageous to take into account the thickness distribution in the rolling process by the roller and the roller die not run absolutely parallel, but have a corresponding angle to each other.
  • Rolling roller 32 recess in 31 for 35

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un composant (14) symétrique en rotation, conique au moins dans un segment axial (25), à partir d'un segment de tôle plat (1, 4). Le procédé est caractérisé en ce que, dans une première étape, un premier segment de tôle plat (4) est façonné dans un processus d'emboutissage profond, entre une première matrice (5) et un poinçon (7), de manière à former une zone conique (15) dans au moins un segment axial, et dans une deuxième étape, la ou les zones coniques (15) sont traitées par un traitement sans enlèvement de copeaux entre une première matrice (8, 35) et un outil de traitement (24, 30) tournant autour de l'axe de symétrie, ne sollicitant la zone conique (15) que sur une ou plusieurs zones linéaires (25) réparties sur la périphérie.
PCT/EP2011/067226 2010-10-07 2011-10-03 Procédé de fabrication de composants coniques dans un procédé d'emboutissage profond et composants ainsi fabriqués WO2012045701A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11764182.9A EP2624979A1 (fr) 2010-10-07 2011-10-03 Procédé de fabrication de composants coniques dans un procédé d'emboutissage profond et composants ainsi fabriqués

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH16462010 2010-10-07
CH01646/10 2010-10-07

Publications (1)

Publication Number Publication Date
WO2012045701A1 true WO2012045701A1 (fr) 2012-04-12

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WO (1) WO2012045701A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH706605A1 (de) * 2012-06-08 2013-12-13 Braecker Ag Spinn- oder Zwirnring.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR678070A (fr) * 1928-07-09 1930-03-18 Procédé et dispositif pour augmenter la résistance d'éléments de construction métalliques aux efforts engendrés par les vibrations
GB327933A (en) * 1929-08-12 1930-04-17 Krupp Ag Improved process of manufacturing cylindrical stepped open shells
US2114596A (en) * 1934-06-26 1938-04-19 British Hygienic Containers Lt Mechanism for fashioning hollow bodies
US3911707A (en) * 1974-10-08 1975-10-14 Anatoly Petrovich Minakov Finishing tool
US4193285A (en) * 1977-06-15 1980-03-18 Alcan Research And Development Limited Method of deep-drawing of a container or the like from an aluminium material
DE3733990A1 (de) * 1987-10-08 1989-04-20 Fricke Gmbh & Co Kg Aufweitwerkzeug fuer enden von duennwandigen blechrohren

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR678070A (fr) * 1928-07-09 1930-03-18 Procédé et dispositif pour augmenter la résistance d'éléments de construction métalliques aux efforts engendrés par les vibrations
GB327933A (en) * 1929-08-12 1930-04-17 Krupp Ag Improved process of manufacturing cylindrical stepped open shells
US2114596A (en) * 1934-06-26 1938-04-19 British Hygienic Containers Lt Mechanism for fashioning hollow bodies
US3911707A (en) * 1974-10-08 1975-10-14 Anatoly Petrovich Minakov Finishing tool
US4193285A (en) * 1977-06-15 1980-03-18 Alcan Research And Development Limited Method of deep-drawing of a container or the like from an aluminium material
DE3733990A1 (de) * 1987-10-08 1989-04-20 Fricke Gmbh & Co Kg Aufweitwerkzeug fuer enden von duennwandigen blechrohren

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH706605A1 (de) * 2012-06-08 2013-12-13 Braecker Ag Spinn- oder Zwirnring.

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