EP1043090A1 - Matrize zum Ziehen von Blech - Google Patents

Matrize zum Ziehen von Blech Download PDF

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Publication number
EP1043090A1
EP1043090A1 EP99830200A EP99830200A EP1043090A1 EP 1043090 A1 EP1043090 A1 EP 1043090A1 EP 99830200 A EP99830200 A EP 99830200A EP 99830200 A EP99830200 A EP 99830200A EP 1043090 A1 EP1043090 A1 EP 1043090A1
Authority
EP
European Patent Office
Prior art keywords
die
main body
drawing tools
lifting
tools
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.)
Withdrawn
Application number
EP99830200A
Other languages
English (en)
French (fr)
Inventor
Eugenio Perazzolo
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.)
Rainer SRL
Original Assignee
Rainer SRL
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 Rainer SRL filed Critical Rainer SRL
Priority to EP99830200A priority Critical patent/EP1043090A1/de
Publication of EP1043090A1 publication Critical patent/EP1043090A1/de
Withdrawn legal-status Critical Current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
    • B21D22/02—Stamping using rigid devices or tools
    • 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
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/06—Stamping using rigid devices or tools having relatively-movable die parts

Definitions

  • the present invention relates to a die for drawing sheet metal and similar.
  • dies I for drawing sheet metal and similar comprise a normally cylindrical main body II, which is insertable inside any die holder seat III on a punching machine, with a top surface IIa coplanar with the work plane P of the sheet IV to be worked; and an appropriately shaped appendix V projecting beyond work plane P from top surface IIa of main body II.
  • Dies of the above type are normally associated with a drawing punch VI, which is located over the work plane P, is aligned with die I, and is movable between a parking position in which the bottom end VIa of the punch is located a given distance d (normally 20 mm) from work plane P ( Figure 1a), and a work position in which bottom end VIa of the punch contacts the top surface IIa of main body II ( Figure 1b).
  • the bottom end VIa of drawing punch VI is obviously shaped to mate with the top end of die I, with sheet IV in between, so as to draw sheet IV.
  • the total height h of appendix V of currently used dies must be no more than half the distance d between top surface IIa of main body II, i.e. work plane P, and the bottom end VIa of drawing punch VI in the parking position.
  • a die for drawing sheet metal and similar comprising a main body which may be housed inside any die holder seat on a machine tool, with a top surface substantially coplanar with the work plane of the sheet metal to be worked; and at least a pair of drawing tools housed inside the main body and movable between a withdrawn position, in which the drawing tools are confined within said main body, and an extracted position, in which the drawing tools project outwards of said main body by a respective end portion of given length h; the die being characterized by comprising actuating means for selectively moving either of the two drawing tools between the extracted position and the withdrawn position.
  • Number 1 in Figure 2 indicates as a whole a die for drawing sheet metal 2 and similar, and which may be housed inside any die holder seat 3 of currently used punching machines, facing a corresponding known drawing punch 100.
  • Die 1 comprises a preferably, but not necessarily, cylindrical main body 4, which is housed inside die holder seat 3 with a top surface 4a coplanar with the work plane P of sheet 2 to be worked; and a pair of drawing tools 5 housed inside main body 4 and movable between a withdrawn position confined within main body 4, and an extracted position in which a respective end portion of given length h of drawing tools 5 project outwards of main body 4. More specifically, each drawing tool 5 is housed in axially-sliding manner inside a respective seat 6 extending from top surface 4a of main body 4 and inwards of main body 4 along an axis B preferably, but not necessarily, parallel to the longitudinal axis A of main body 4.
  • Die 1 also comprises a lifting device 7 for selectively moving either of the two drawing tools 5 from the withdrawn to the extracted position and vice versa.
  • lifting device 7 comprises a pair of hydraulic actuators 8 controlled to move drawing tools 5 from the withdrawn to the extracted position; and a pair of reaction springs 9 for holding drawing tools 5 in the withdrawn position.
  • Each hydraulic actuator 8 is located at the bottom of a respective seat 6 and, when commanded, provides for lifting drawing tool 5, which is movable insider seat 6, from the withdrawn to the extracted position; and each reaction spring 9 is housed inside a respective seat 6 and located over a respective hydraulic actuator 8, with a first end resting on main body 4, and a second end resting on drawing tool 5 to push drawing tool 5 towards the bottom of seat 6 into the withdrawn position.
  • each hydraulic actuator 8 comprises a piston 10 housed in axially-sliding manner inside a cylindrical cavity 11 extending inwards of main body 4 from the bottom of seat 6; a first end of piston 10 projects inside seat 6 and supports drawing tool 5; and a second end of piston 10 defines, together with the walls of cylindrical cavity 11, a variable volume chamber lla filled with pressurized, obviously incompressible, oil.
  • reaction spring 9 is trapped inside a cylindrical cavity 12 formed inside seat 6, partly in the wall of main body 4 defining seat 6, and partly in the body of drawing tool 5.
  • the two parts of cylindrical cavity 12 slide with respect to each other, and face each- other when drawing tool 5 is in the withdrawn position.
  • reaction spring 9 is of maximum length when the two parts of cylindrical cavity 12 are positioned facing each other, and opposes any mutual sliding movement of the two parts of cylindrical cavity 12, and hence any movement of drawing tool 5 from the withdrawn position.
  • Lifting device 7 also comprises two pressurized-oil supply conduits 13 and 14, each of which extends inside main body 4 to connect a respective hydraulic actuator 8, i.e. the variable-volume chamber 11a of the actuator, to an external hydraulic control circuit 15 (shown only partly in Figure 2) for appropriately distributing pressurized oil to the two variable-volume chambers lla to move, when commanded, either one of drawing tools 5 into the extracted position.
  • a respective hydraulic actuator 8 i.e. the variable-volume chamber 11a of the actuator
  • an external hydraulic control circuit 15 shown only partly in Figure 2 for appropriately distributing pressurized oil to the two variable-volume chambers lla to move, when commanded, either one of drawing tools 5 into the extracted position.
  • the two pressurized-oil supply conduits 13 and 14 of lifting device 7 are replaced by a single conduit 20 for connecting the two hydraulic actuators 8, i.e. the two variable-volume chambers lla, directly to each other.
  • lifting device 7 provides for moving the two drawing tools 5 oppositely with respect to each other between the extracted- and withdrawn positions, so that both drawing tools 5 can never be simultaneously in the extracted or withdrawn position. In this case, lifting device 7 also provides for setting both drawing tools 5 simultaneously to an intermediate parking position in which respective end portions of length h/2 of both drawing'tools 5 project outwards of main body 4.
  • the two drawing tools 5 are moved by means of drawing punch 100 at the start of the drawing operation. That is, given the form of the punch, one of the two drawing tools 5 must necessarily move into the withdrawn position, and the other into the extracted position.
  • Lifting device 7 in the Figure 2 embodiment may obviously operate in the same way as in the Figure 3 variation, by hydraulic control circuit 15 simply distributing pressurized oil to the two variable-volume chambers lla in such a way as to normally maintain both drawing tools 5 in the intermediate parking position, and, when commanded, to move one of drawing tools 5 into the extracted position and the other into the withdrawn position.
  • the Figure 4 variation differs from that in Figure 3 by both drawing tools 5 being housed in axially-sliding manner inside one seat 21, as opposed to respective seats 6.
  • the Figure 5 variation differs from that in Figure 4 by lifting device 7 comprising, as opposed to two hydraulic actuators 8, a lifting wedge 22, which is movable at the bottom of seat 21 between a rest position - in which lifting wedge 22 is stationary at the center of the bottom of seat 21, so that both drawing tools 5 are set to the intermediate parking position - and two work positions on either side of the rest position - in which lifting wedge 22 is inserted beneath and lifts one drawing tool 5 into the extracted position, while simultaneously allowing the other tool to move into the withdrawn position.
  • lifting device 7 comprising, as opposed to two hydraulic actuators 8, a lifting wedge 22, which is movable at the bottom of seat 21 between a rest position - in which lifting wedge 22 is stationary at the center of the bottom of seat 21, so that both drawing tools 5 are set to the intermediate parking position - and two work positions on either side of the rest position - in which lifting wedge 22 is inserted beneath and lifts one drawing tool 5 into the extracted position, while simultaneously allowing the other tool to move into the withdrawn position.
  • lifting device 7 also comprises a three-position linear actuator 23 for moving lifting wedge 22 horizontally along the bottom of seat 21 between the central rest position and the two lateral work positions.
  • lifting wedge 22 is defined by a substantially triangular-section prismatic body, and is positioned with one of the three faces resting on the bottom of seat 21; and the bottom end 5a of each drawing tool 5 is defined by a flat surface inclined with respect to the longitudinal axis B of drawing tool 5 and parallel to and facing a free face of lifting wedge 22, and rests in sliding manner on a respective free face of lifting wedge 22.
  • the Figure 6 variation differs from that in Figure 5 by lifting wedge 22 being defined by a cylindrical body, and by the bottom end 5a of each drawing tool 5 resting in sliding manner on the cylindrical lateral surface of lifting wedge 22.
  • lifting device 7 comprising, as opposed to two hydraulic actuators 8, a substantially V-shaped rocker arm 25 positioned with the central portion resting on the bottom of seat 21, and with each of the two ends resting against the bottom end 5a of a respective drawing tool 5.
  • sheet 2 is drawn by positioning a portion of sheet 2 between die 1 and drawing punch 100, and moving drawing punch 100 from the parking to the work position.
  • one of the two drawing tools 5 must be set to the extracted position, and the other to the withdrawn position.
  • the shape of drawing tools 5 depends on the type of deformation required of sheet 2.
  • drawing tools 5 in the withdrawn or intermediate parking position must project from top surface 4a of main body 4 by a given length (zero or h/2 in the example shown) which, added to the drawing depth of sheet 2 (h in the example shown) must be less than or equal to distance d between the top surface 4a of main body 4 and the bottom end of drawing punch 100 in the parking position.
  • height h must be less than or equal to distance d according to the equation : 0 + h ⁇ d.
  • height h must be less than or equal to two thirds of distance d according to the equation : h/2 + h ⁇ d.
  • drawing tools 5 project from top surface 4a of main body 4 by a length less than or equal to d/3.
  • drawing tool 5 projects above work plane P by an end portion of length h greater than the distance d/2 constituting the current construction limit. Moreover, in the intermediate parking position, drawing tools 5 project above work plane P by respective end portions of length d/3, thus enabling easier handling of sheets 2 in work plane P. Yet another advantage of die 1 is that of now housing two drawing tools 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
EP99830200A 1999-04-07 1999-04-07 Matrize zum Ziehen von Blech Withdrawn EP1043090A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99830200A EP1043090A1 (de) 1999-04-07 1999-04-07 Matrize zum Ziehen von Blech

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99830200A EP1043090A1 (de) 1999-04-07 1999-04-07 Matrize zum Ziehen von Blech

Publications (1)

Publication Number Publication Date
EP1043090A1 true EP1043090A1 (de) 2000-10-11

Family

ID=8243345

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99830200A Withdrawn EP1043090A1 (de) 1999-04-07 1999-04-07 Matrize zum Ziehen von Blech

Country Status (1)

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EP (1) EP1043090A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1552893A1 (de) * 2004-01-09 2005-07-13 Ford Global Technologies, LLC Vorrichtung zum Umformen von Metallblechen an kritischen Flächen von Verkleidungsteilen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB525075A (en) * 1939-02-14 1940-08-21 Rudolph William Glasner Improvements in die gauging and fitting machines
DE1134956B (de) * 1957-04-12 1962-08-23 Andre Huet Presse zum Verformen von Blech
US3650142A (en) * 1969-07-18 1972-03-21 Western Electric Co Method of and apparatus for decreasing the spacing between articles
JPS5764498A (en) * 1980-10-07 1982-04-19 Toyota Motor Corp Triple forming method and triple forming device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB525075A (en) * 1939-02-14 1940-08-21 Rudolph William Glasner Improvements in die gauging and fitting machines
DE1134956B (de) * 1957-04-12 1962-08-23 Andre Huet Presse zum Verformen von Blech
US3650142A (en) * 1969-07-18 1972-03-21 Western Electric Co Method of and apparatus for decreasing the spacing between articles
JPS5764498A (en) * 1980-10-07 1982-04-19 Toyota Motor Corp Triple forming method and triple forming device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 006, no. 142 (M - 146) 31 July 1982 (1982-07-31) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1552893A1 (de) * 2004-01-09 2005-07-13 Ford Global Technologies, LLC Vorrichtung zum Umformen von Metallblechen an kritischen Flächen von Verkleidungsteilen

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