EP0015218A1 - Tiefziehvorrichtung mit zentripetaler Blechverformung - Google Patents

Tiefziehvorrichtung mit zentripetaler Blechverformung Download PDF

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Publication number
EP0015218A1
EP0015218A1 EP19800420016 EP80420016A EP0015218A1 EP 0015218 A1 EP0015218 A1 EP 0015218A1 EP 19800420016 EP19800420016 EP 19800420016 EP 80420016 A EP80420016 A EP 80420016A EP 0015218 A1 EP0015218 A1 EP 0015218A1
Authority
EP
European Patent Office
Prior art keywords
blank
cams
punch
plate
press
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.)
Ceased
Application number
EP19800420016
Other languages
English (en)
French (fr)
Inventor
Pierre Cuq
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0015218A1 publication Critical patent/EP0015218A1/de
Ceased legal-status Critical Current

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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
    • B21D22/22—Deep-drawing with devices for holding the edge of the blanks
    • B21D22/225—Deep-drawing with devices for holding the edge of the blanks with members for radially pushing the blanks

Definitions

  • the invention relates to a rational and balanced stamping process, as well as to an apparatus for its implementation.
  • Stamping is the transformation of a piece of flat sheet metal called a blank, into a hollow volumetric body.
  • This transformation is obtained by the forcing of this blank in the opening of a part called the matrix, by the thrust of a solid element of the same geometry, but leaving between the matrix and itself the passage of the thickness of the metal which constitutes the blank; this element is called punch.
  • the metal of the blank thus stressed must be compressed circumferentially to be able to penetrate into the opening of the matrix and has a tendency to crease.
  • the blank is pressed against the face of the matrix, while allowing to slide, but this pressure must be well defined, and the part performing this function, called blank press, must be perfectly polished.
  • the hollow body obtained is generally called a bucket and has, in principle, the same surface as the blank, so the same thickness.
  • the object of the present invention is to provide a drawing process which remedies the above-listed defects by eliminating the imbalance which is the cause thereof.
  • This process consists in exercising on the edge of the blank, the start of work, and between the blank press and the die, radial forces towards the center, generating in this blank a priority circumferential compression stress and synchronized with the tensile stress generated by the force of the punch on the central part of the blank .
  • the invention also relates to an apparatus for implementing this method, either in the form of an assembly studied for stamping a single type of part, or in the form of an additional press assembly capable of 'be common to various types of parts s the latter form to simplify the device in its own part to the type of part to be produced.
  • This device comprises, in addition to the active elements of a conventional stamping tool, namely: die, punch and blank press on the one hand, cams judiciously distributed around the longitudinal axis of the punch, the profile of these cams being determined mathematically according to the law of the flow of metal in the transformation concerned, without having to determine the value of the effort required, on the other hand, of the thrust members in a number equal to that of the cams and capable of sliding radially, according to a law defined by the cams, between die and blank press, from a rest position in which their ends ensure the centering of the blank, and in the direction of an advanced position in which they stop their pushing on the edge of the blank, being contained on both sides to be able to transmit the compressive force without flaming. , return means bring each thrust member to its rest position.
  • Each pushing member is composed of a cylindrical drawer mounted to slide in a radial housing of the tray carrying the blank press, this housing opening out of the tray so that a flat part of the drawer is in the plane of this tray, and of a high-strength steel blade which, placed and positioned on the aforementioned flat, has a thickness less than that of the blank to be worked and is associated with means preventing it from bending from the start of work.
  • the means preventing the blades from bending, from the start of work consist of an attached cover with centering on the blank press holder plate and comprising radial grooves for guiding the blades opposing buckling which would arise from the effort of compression to which these blades are subjected.
  • the cams in permanent contact with the pushing members are arranged around the punch, and are held and positioned by vertical grooves formed in a ring attached to the sole of the device and thus ensuring the positioning of the blank holder tray.
  • the die holder meets, at the same time as the die touches the blank, the cover of the blank press holder plate, and forces this plate to move downwards, driving the thrust members. simultaneously moved radially, by the cams, and push the blank at the same time as the die forces this blank to cover the punch.
  • This punch is adjustable in height by a thread that carries its base, which is necessary to position it exactly, in order to ensure the cooperation of traction and compression actions.
  • the cams are integral with a removable block, disposed under the punch, movable with the latter, and cooperating with fixed control members which, acting on the thrust members, are connected to these the latter by means transmitting their movement.
  • the device shown in Figures 1 to 4, consists of a die 1 secured to a die holder 6, itself fixed to the slide 24 of a press and an ejector 7.
  • a punch 2, screwed in a sole 8, is blocked by a rod 9, to be adjustable in height. It passes through the blank press 4 mounted in the plate 5, which rests on rods 11. These transmit to the blank press 4 l 'ef-. very necessary communicated by the plate 10.
  • the plate 2 moves vertically by sliding in a ring 12 fixed concentrically to the punch 2 on the sole 8. This latter supports and maintains cams at their base 13. These cams, held at their upper part by a plate 14, are distributed with constant angular spacing, by vertical grooves formed in the ring 12.
  • the plate 5 carries on its periphery, near its upper face and in number equal to that of the cams 13, bores whose upper part opens out from the upper face of the plate.
  • Each drawer receives on its face 27, and resting on the flange 27a, a blade 23 made of high-strength steel which is positioned by a radial pin 25 protruding from said face 27. This blade has a thickness slightly smaller than that of the blank 3 to be worked, so as to be able to slide between die and punch.
  • each drawer is provided, on the cam side, with a vertical yoke for a roller 22 mounted free in rotation on a transverse axis 21 and, on the blank side, of a blind hole for a return spring 20 against the cam which faces it.
  • This spring bears, by its other end, on the blank holder 4.
  • the plate 5 receives, on its upper face, a cover 17 which, as shown in FIG. 7, has grooves 26 guiding and holding the blades 23 and is provided, like the plate 5, with vertical grooves straddling the cams 13 ensuring the orientation of the thrust members each composed of a drawer 19 and a blade 23.
  • the thrust members recalled behind by the springs 20, are in abutment against the centering 5a provided on the plate 5 for the cover 17, by the heel of the blades 23.
  • the descent of the slide 24 brings the die 1 into contact with the blank 3, and the die holder 6 against the cover 17, forcing the plate 5 to descend. Due to this movement, the rollers 22 rolling on the cams force the drawers 19 and the blades 23 to exert on the edge of the blank a compressive stress forcing the fibers of the metal of the blank to move towards the orifice of the matrix.
  • the die 1 covers the blank 3 on the punch 2 which conforms it until the end of the stroke shown in FIG. 2.
  • the slide 24 goes up the upper part of the device, which releases the plate 5, which pushed by the rods 11 returns to its starting position, as well as the pushing members returned by the springs 20.
  • the apparatus shown in FIG. 8, also consists of a matrix l, integral with a matrix holder 6, itself fixed to the slide 24 of a press and an ejector 7.
  • the sole 8 is integral with the punch 2.
  • the rods 11 support the plate 5 and its cover 17 trapping the thrust members.
  • each thrust member is controlled by a piston 37 movable in a cylinder 36 supplied by a flexible hose 35.
  • the latter is connected to a cylinder 21, the piston 32 of which is provided, in its front part forming a vertical yoke, with a transverse axis 34 on which a roller 33 is mounted to rotate freely.
  • the cylinders 31 are mounted on a ring 30 fixed under the table 40 of the press, by screws 41.
  • This ring 30 is provided with grooves 42 slotted vertically in its bore, opposite each cylinder location, to orient and guide the cams 43 of the cam block 38 supported by a spring 39.
  • the cam block is turned to the profile defined for the cams, and milled parallel to its axis to release the number of cams corresponding to the number of cylinders 31.
  • this device remains the same as that of the device shown in FIG. 1, but the movement created by the cams is transmitted to the thrust members, by the hydraulic relay constituted by the jacks 31 and 36 connected by the flexible pipes 35. Therefore, all types of parts, characterized by the same drawing ratio, can be executed with the same cam block, and the upper part of the device is simplified.
  • connection by threading of the punch 2 on the sole 8 makes it possible to adjust the height of the first in order to ensure the coordination of the actions of circumferential compression on the blank and of traction on its center, without obligation to dismantle the tool. This adjustment is blocked by screwing the rod 9 into the sole 8.
  • the blades 23 which, in the embodiments described above only come into contact with each other in their most advanced position, are, in an alternative embodiment, wider and each comprise, at least near their end coming into contact with the blank, two strange edges in opposite directions suitable, respectively, for overlapping and being overlapped by the corresponding edges of the juxtaposed blades.
  • These quirks are determined so that the end faces of the blades delimit a continuous surface in all their radial positions, in order to avoid pinching, even imperceptible, of the edge of the flano

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Forging (AREA)
EP19800420016 1979-02-14 1980-02-13 Tiefziehvorrichtung mit zentripetaler Blechverformung Ceased EP0015218A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7904466A FR2448946A1 (fr) 1979-02-14 1979-02-14 Procede d'emboutissage, avec conformage centripete du flan
FR7904466 1979-02-14

Publications (1)

Publication Number Publication Date
EP0015218A1 true EP0015218A1 (de) 1980-09-03

Family

ID=9222280

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800420016 Ceased EP0015218A1 (de) 1979-02-14 1980-02-13 Tiefziehvorrichtung mit zentripetaler Blechverformung

Country Status (2)

Country Link
EP (1) EP0015218A1 (de)
FR (1) FR2448946A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5406823A (en) * 1991-01-18 1995-04-18 Nam Lee Industries (Pte) Ltd. Method of producing a main frame for a shipping container
WO2001087511A1 (de) * 2000-05-13 2001-11-22 Blanco Gmbh + Co Kg Tiefziehverfahren und tiefziehwerkzeug
CN101869944A (zh) * 2010-04-15 2010-10-27 重庆理工大学 通过固体颗粒介质加径向推力的可变形状凸模成形模具
JP2016175130A (ja) * 2016-07-05 2016-10-06 アイダエンジニアリング株式会社 絞り成形方法及び装置
CN113732153A (zh) * 2021-08-11 2021-12-03 岚图汽车科技有限公司 拉延模具和拉延设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4331017A (en) * 1980-12-11 1982-05-25 Joseph Bulso, Jr. High reduction process and apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH471608A (de) * 1966-11-04 1969-04-30 Western Electric Co Ziehverfahren zur Formgebung eines Rohlings aus einem plastifizierbaren Feststoff und Einrichtung zur Durchführung des Verfahrens
FR2124624A1 (de) * 1971-02-10 1972-09-22 Western Electric Co

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH471608A (de) * 1966-11-04 1969-04-30 Western Electric Co Ziehverfahren zur Formgebung eines Rohlings aus einem plastifizierbaren Feststoff und Einrichtung zur Durchführung des Verfahrens
FR2124624A1 (de) * 1971-02-10 1972-09-22 Western Electric Co

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WERKSTATT UND BETRIEB, Vol. 11, Nov. 1966 Munich DE G. OEHLER: "Stanzereitechnik. Verbesserung des Ziehverhaltnisses durch Radialdruck gegen den Zuschnitt", pages 803-804. * Figures 1, 2 * *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5406823A (en) * 1991-01-18 1995-04-18 Nam Lee Industries (Pte) Ltd. Method of producing a main frame for a shipping container
WO2001087511A1 (de) * 2000-05-13 2001-11-22 Blanco Gmbh + Co Kg Tiefziehverfahren und tiefziehwerkzeug
US6622539B2 (en) 2000-05-13 2003-09-23 Blanco Gmbh + Co Kg Deep-drawing method and deep-drawing die
CN101869944A (zh) * 2010-04-15 2010-10-27 重庆理工大学 通过固体颗粒介质加径向推力的可变形状凸模成形模具
JP2016175130A (ja) * 2016-07-05 2016-10-06 アイダエンジニアリング株式会社 絞り成形方法及び装置
CN113732153A (zh) * 2021-08-11 2021-12-03 岚图汽车科技有限公司 拉延模具和拉延设备

Also Published As

Publication number Publication date
FR2448946A1 (fr) 1980-09-12

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