EP0251024B1 - Ziehwerkzeug - Google Patents

Ziehwerkzeug Download PDF

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Publication number
EP0251024B1
EP0251024B1 EP87108650A EP87108650A EP0251024B1 EP 0251024 B1 EP0251024 B1 EP 0251024B1 EP 87108650 A EP87108650 A EP 87108650A EP 87108650 A EP87108650 A EP 87108650A EP 0251024 B1 EP0251024 B1 EP 0251024B1
Authority
EP
European Patent Office
Prior art keywords
working
piston
cylinder
annular
working piston
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.)
Expired - Lifetime
Application number
EP87108650A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0251024A3 (en
EP0251024A2 (de
Inventor
Erhard Reitter
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
Priority to AT87108650T priority Critical patent/ATE56166T1/de
Publication of EP0251024A2 publication Critical patent/EP0251024A2/de
Publication of EP0251024A3 publication Critical patent/EP0251024A3/de
Application granted granted Critical
Publication of EP0251024B1 publication Critical patent/EP0251024B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/10—Devices controlling or operating blank holders independently, or in conjunction with dies
    • B21D24/14—Devices controlling or operating blank holders independently, or in conjunction with dies pneumatically or hydraulically

Definitions

  • the invention relates to a drawing tool for reshaping a blank in one drawing process, for example to a pot-shaped drawing part, with a sheet metal holder enclosing the working piston of at least one working cylinder with at least one drawing die movable in opposite directions to the sheet metal holder, and with a drivable one on the hydraulic fluid filling of a pressurizing chamber indirectly Supportable drawing ring, by means of the drawing movement of which hydraulic fluid is displaced from a loading space which acts on the working piston for an opposite working direction, the working piston having a central central recess into which an extension with a head extends coaxially to the working cylinder and a front surface of the working piston is formed by a ring part concentrically enclosing the extension, the front surface of which can be acted upon from a loading space delimited by the ring part and the head and wherein a rear surface of the working piston can be acted upon from an application space which is delimited on the one hand by the head and on the other hand by the
  • DE-A 3 424 262 (exemplary embodiment of FIGS. 3, 4) describes a drawing tool of this type which comprises a drawing cushion for supporting a sheet metal holder and a further one, consisting of a plurality of pressure cylinders acted on by pressure medium and pistons axially movable therein Has drawing die which is movably guided in the drawing direction and which has at least one pressure cylinder connected to the pressure cylinders of the drawing cushion which serves to support the sheet metal holder via flow paths and which can be acted upon by pressure medium displaced from these pressure cylinders during the drawing process, with a piston accommodated in the latter.
  • the previously known drawing tool is therefore associated with the fact that a plurality of further printing cylinders are assigned to a printing cylinder supporting the movable drawing punch, on which the sheet metal holder surrounding the drawing punch is supported. It is characteristic that when a drawing ring actuated, for example, by a press ram, pressure medium flowing out of the pressure cylinders of the drawing cushion serving to support the sheet metal holder flows over suitable flow paths into the pressure cylinder of the further drawing cushion, on which the vertically movable drawing die is accommodated, and flows over one guided in this pressure cylinder Piston acts, which in turn drives the drawing die against the direction of movement of the drawing ring and accordingly the sheet holder in the drawing direction during the drawing process.
  • This device thus enables the execution of complicated counter-pulls to the pull mediated by the descending pull ring, but also the resolution of the desired drawing depth in one of the descending pull ring and one pull-up caused by the pulling die (see also US Pat. No. 2,609,775) .
  • the object on which the invention is based is to create a drawing tool which enables drawing technology which can be realized with the generic drawing tool, but is distinguished by a much simpler and more cost-effective construction and an extraordinarily compact design.
  • the external force vector acting on the drawing ring can be converted into an opposing, substantially larger force vector serving as the drawing force.
  • the external force vector can be converted into an opposing force vector of the same size, but this can act on a smaller drawing piston.
  • the possibilities mentioned result from the fact that the hydraulic medium displaced by the annular piston can act on the working piston via an action surface which is larger than the cross section of the working piston. This fact arises from the fact that the head of the extension radially engages over the rear piston surface which can be acted upon from the rear loading space of the working piston. As a result, the entire pressure surface of the working piston is composed of its rear pressure surface and the front surface of the head.
  • the solution according to the invention realizes an extensive structural separation between the hydraulic unit of the drawing tool on the one hand and the drawing ring, the sheet metal holder and the drawing punch on the other hand, without impairing the space-saving construction of the drawing tool, by the latter components being relatively easy to replace.
  • differently designed or profiled drawing rings, sheet metal holders and / or drawing punches can be used on different drawn parts, which is not possible with the known arrangements. This makes a more rational, cost-saving series production possible on the basis of the modular principle.
  • the working cylinder 11 shown in FIG. 1 by itself comprises a base plate 12 and a cylinder sleeve 13 accommodated thereon, in which a central working piston 14 and an annular piston 15 surrounding the latter are accommodated in opposite directions so as to be axially movable in opposite directions.
  • the ring piston 15 is sealed by means of O-ring seals 16 arranged in ring grooves of the cylinder sleeve 13 and the central working piston 14 is sealed off from the ring piston by O-ring seals 17 received in ring grooves of the ring piston.
  • a cylindrical central recess 18 extends into the central working piston 14 from the side pointing toward the base plate 12 and is closed off by a piston crown 19 on the side remote from the base plate.
  • a piston-shaped head 20 of a cylindrical extension 21 engages in the cylindrical central recess of the working piston, which extends coaxially to the working piston from the base plate of the working cylinder and has a smaller diameter than the head 20 engaging in the central recess 18 of the working piston.
  • the head 20 of this cylindrical extension 21 is sealed off from the walls delimiting the cylindrical central recess by O-ring seals 22 accommodated in annular grooves in the head.
  • annular pressurizing chamber 28 is formed which can be acted upon with flow pressure medium via a channel 29, 30 extending through the base plate and the cylindrical extension.
  • the application space 32 between the rear of the working piston 14 and the base plate 12 is connected to the space 34 between the piston crown 19 of the working piston and the side of the head 20 of the extension remote from the base plate via a flow channel 35 which extends through the working piston.
  • the central working piston 14 and the annular piston 15 concentrically surrounding it in the working cylinder 11 are axially movable in opposite directions. Accordingly, the working cylinder 11 has a hydraulic medium filling, which acts on the rear side of the annular piston 15 and acts on both the rear side of the central working piston 14 facing the base plate 12 and the side of the piston head 19 opposite the head 20 of the cylindrical extension 21.
  • the rear-facing surfaces of the working piston 14 in the illustrated hydraulic element 10 have the same area as the rear of the annular piston 15. If the flow channel 35 e.g. is closed by a stopper, the force (forming force) that acts on the working piston 14 corresponds to the sheet metal holding force with which the annular piston is moved axially.
  • the forming force may be made greater or smaller than the sheet holding force. Much larger is e.g. the forming force when the piston crown 19 is additionally acted upon from the space 34 when the flow channel 35 is open.
  • the arrangement is such that the working piston 14 is in its end position limited by the ring part 15 screwed into the cylindrical central recess 18 on a stop 36 of the cylindrical extension when the ring piston 15 is in its fully retracted position and with its rear side on the base plate 12 which closes off the working cylinder. This is shown in the right half of FIG. 1.
  • the working piston 14 stands on its back on the base plate 12 when the annular piston 15 is in its maximum extension position, in which an annular stop 37 of the annular piston rests on an annular shoulder acting as a stop 38 the cylinder sleeve 13 has accrued.
  • Axial displacement of the annular piston 15 from its full extension position in the direction of the base plate 12 of the working cylinder consequently results in a corresponding action on the rear side of the working piston 14 and the piston crown 19, and consequently in a displacement of the working piston into one, due to the displacement of the hydraulic medium acting on the rear side of the annular piston Location distant from the base plate.
  • the working piston 14 can be reset from the position distant from the base plate 12 of the working cylinder by acting on the front surface 39 of the ring part 25 pointing towards the head 20 of the cylindrical extension 21 with flow pressure medium via the flow channels 29 extending through the base plate and the cylindrical extension.
  • FIG. 2 shows the drawing tool 40 with the working cylinder according to FIG. 1 for producing pot-like drawing parts 41.
  • a drawing punch 42 is fixedly received on the central working piston 14, which is supported by a sheet metal holder 43 which is supported on the annular piston 15 concentrically surrounding the working piston is enclosed.
  • This sheet metal holder has a guide section 44 which extends in the direction of the base plate 12 of the working cylinder and surrounds the cylinder sleeve 13.
  • the sheet metal holder 43 and the drawing punch 42 are in a starting position which characterizes the beginning of a drawing process, in which a circuit board 45 is received on the sheet metal holder.
  • the annular piston 15 supporting the sheet metal holder 43 is in its maximum extension position, while the working piston 14 receiving the punch 42 is in its retracted position. If the drawing ring 46 of a tool upper part 47 illustrated in the right half-sectional view of FIG.
  • the drawing process begins in such a way that the sheet metal holder and thus the sheet metal holder and thus the sheet metal holder 43 is clamped between the drawing ring 46 and the sheet metal holder 43 the latter supporting annular piston 15 are moved in the direction of the base plate 12 of the working cylinder, which leads to the fact that the working piston 14 receiving the punch 42 is acted upon by the flow pressure medium displaced by the descending annular piston 15 and is therefore driven against the movement of the annular piston. Accordingly, the drawing die 42 experiences a drive movement counter to the direction of movement of the sheet metal holder 43, so that the drawing process is resolved into a partial stroke carried out by the sheet metal holder and an opposing partial stroke of the drawing die.
  • FIG. 2 illustrates the operating position at the end of the drawing process, in which the pot-like deep-drawn part 41 is formed and a peripheral edge flange of the drawn part is still received between the drawing ring 46 and the sheet metal holder 43.
  • the annular piston 15 supporting the sheet metal holder 43 stands on the base plate 12 of the working cylinder, while the working piston 14 receiving the punch 42 is in the maximum extension position limited by the stop 36 of the cylindrical extension 21.
  • the drive movement of the working piston 14 is brought about by simultaneously acting on the rear side of the working piston facing the base plate and the piston head 19 via the overflow channel 35 extending through the working piston.
  • a resetting of the drawing tool into its initial position takes place while the upper tool part 47 is being raised at the same time as the side of the ring part 25 screwed into the central central recess 18 from the base plate 12 of the working cylinder via the flow channels 29, 30 extending through the base plate and the cylindrical extension Flow pressure medium is applied.
  • This can be achieved in that the outflow of the hydraulic medium required in the drawing process from the pressurizing chamber 28 is more or less braked by means of a throttle valve.
  • the tool 50 illustrated in FIGS. 3 and 4 is a drawing tool for producing double-bowl sinks. Accordingly, two working cylinders 51, 52 are arranged axially parallel to one another at a distance from one another and are combined in a cylinder block 54 accommodated on a base plate 53. In each of these working cylinders, an inner working piston 55, 56 and an annular piston 57, 58 movable in opposite directions are accommodated in the manner explained above in connection with FIG. 1.
  • the annular pistons of the two working cylinders support a pressure distribution plate 60 which has a guide section 61 which surrounds the cylinder block 54 and on which the sheet metal holder 62 is received on the upper side.
  • the central working pistons 55, 56 of the working cylinders extend through recesses in the pressure distribution plate 60, on which the drawing punches 63, 64 corresponding to the basin shapes are received.
  • the tool In the left half-sectional view of Fig. 3, the tool is shown in its starting position, in which the punch and sheet metal holder are in one plane. In this operating position, the annular pistons 57, 58 supporting the sheet metal holder 62 via the pressure distribution plate 60 are in their maximum extension position, while the working pistons 55, 56 on which the drawing punches 63, 64 are accommodated are in their lower end positions. If the sheet metal holder 62 is then lowered by the lowering of a drawing ring 65, as illustrated in the right half-sectional view of FIG.
  • the annular pistons 57, 58 supporting the sheet metal holder displace flow pressure medium in the working cylinders, which then causes the central working pistons 55 to be acted upon from the rear , 56 and thus leads to the drive of the drawing punches 63, 64 received on the working cylinders against the direction of movement of the sheet metal holder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Lubricants (AREA)
  • Gripping On Spindles (AREA)
  • Actuator (AREA)
  • Pens And Brushes (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
EP87108650A 1986-06-21 1987-06-16 Ziehwerkzeug Expired - Lifetime EP0251024B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87108650T ATE56166T1 (de) 1986-06-21 1987-06-16 Ziehwerkzeug.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3620876 1986-06-21
DE19863620876 DE3620876A1 (de) 1986-06-21 1986-06-21 Hydraulikelement und damit aufgebautes ziehwerkzeug

Publications (3)

Publication Number Publication Date
EP0251024A2 EP0251024A2 (de) 1988-01-07
EP0251024A3 EP0251024A3 (en) 1988-08-17
EP0251024B1 true EP0251024B1 (de) 1990-09-05

Family

ID=6303447

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87108650A Expired - Lifetime EP0251024B1 (de) 1986-06-21 1987-06-16 Ziehwerkzeug

Country Status (5)

Country Link
US (1) US4796453A (enrdf_load_stackoverflow)
EP (1) EP0251024B1 (enrdf_load_stackoverflow)
JP (1) JPS632522A (enrdf_load_stackoverflow)
AT (1) ATE56166T1 (enrdf_load_stackoverflow)
DE (2) DE3620876A1 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE91653T1 (de) * 1988-03-12 1993-08-15 Karl Hehl Ziehwerkzeug zum umformen von blechen.
DE3907702A1 (de) * 1988-03-12 1989-09-21 Karl Hehl Ziehwerkzeug zum umformen von blechen
JP7403794B2 (ja) * 2019-11-07 2023-12-25 太陽工業株式会社 複動プレス金型
JP7230866B2 (ja) * 2020-03-02 2023-03-01 トヨタ車体株式会社 プレス型

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2609775A (en) * 1949-06-14 1952-09-09 Production Tool & Die Co Inc Hydraulic die
US3751962A (en) * 1970-11-06 1973-08-14 Reynolds Metals Co Method and apparatus for making a drawn article
SE414527B (sv) * 1978-11-07 1980-08-04 Volvo Ab Cylinder med tvastegsrorelse, speciellt en svetscylinder
DE2948396A1 (de) * 1979-12-01 1981-07-02 Uniplanung Metall- Und Kunststoffengineering Gmbh & Co Kg, 7555 Bietigheim Werkzeug zur blechbearbeitung, insbesondere ziehwerkzeug mit feststehendem ziehstempel im werkzeugunterteil
US4530224A (en) * 1980-07-12 1985-07-23 Sms Schloemann-Siemag Ag Strip-guide assembly for a metal strip coiler
DE8105898U1 (de) * 1981-03-02 1982-04-08 Leibfried Maschinenbau Gmbh, 7033 Herrenberg Kolben-Zylinder-Aggregat
DE3333687A1 (de) * 1983-09-17 1985-03-28 Uniplanung Metall- und Kunststoffengineering GmbH & Co KG, 7552 Durmersheim Einrichtung an werkzeugen oder pressen zum ziehen von blechformteilen
CH665007A5 (de) * 1984-05-11 1988-04-15 Enfo Grundlagen Forschungs Ag Hydraulischer zylinder mit kraftmultiplikation.
DE3424262A1 (de) * 1984-06-30 1986-01-09 Uniplanung Metall- und Kunststoffengineering GmbH & Co KG, 7552 Durmersheim Verfahren zum ziehen von blechformteilen und einrichtung an ziehwerkzeugen oder ziehpressen zum durchfuehren des verfahrens
JPS61139828A (ja) * 1984-12-12 1986-06-27 Toshiba Corp 言語入力装置
DE8600823U1 (de) * 1986-01-15 1986-03-06 Brauer GmbH & Co, 4150 Krefeld Gleichgeschwindigkeits-Teleskopzylinder

Also Published As

Publication number Publication date
DE3620876C2 (enrdf_load_stackoverflow) 1992-04-23
DE3620876A1 (de) 1987-12-23
ATE56166T1 (de) 1990-09-15
DE3764728D1 (de) 1990-10-11
US4796453A (en) 1989-01-10
EP0251024A3 (en) 1988-08-17
JPS632522A (ja) 1988-01-07
EP0251024A2 (de) 1988-01-07

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