US3808872A - Device in particular for drawing sheet-metal - Google Patents

Device in particular for drawing sheet-metal Download PDF

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Publication number
US3808872A
US3808872A US00307999A US30799972A US3808872A US 3808872 A US3808872 A US 3808872A US 00307999 A US00307999 A US 00307999A US 30799972 A US30799972 A US 30799972A US 3808872 A US3808872 A US 3808872A
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US
United States
Prior art keywords
piston
rod
pressure
bore
sleeve
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
US00307999A
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English (en)
Inventor
J Martin
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Individual
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Individual
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Filing date
Publication date
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Publication of US3808872A publication Critical patent/US3808872A/en
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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

Definitions

  • a device in particular for drawing sheet metal, having a drawing die which is movable in a cylinder by means of a piston and which can be moved towards the workpiece by the action of a pressure medium on a face of the piston, in which the face of the piston which is influenced by the pressure medium in the supply direction comprises a pressure rod which is connected to the piston and on which a further piston having a shell which encloses the pressure rod in a sealing manner is axially movable, in which the shell guides the pressure rod at a distance above the piston in a sleeve which has a smaller diameter than the cylinder and is closed at its end, the space in said sleeve being filled with a hydraulic liquid, the endof the shell having a smaller diameter exerting a hydraulically intensified pressure on the upper end of the pressure rod.
  • the known devices suffer from the drawback of having to be constructed so as to be comparatively wide because the piston has a larger diameter so as to obtain the larger force. As a result of this, the dies in the known devices cannot be placed so as to be sufficiently close together.
  • the face of the pressure piston influenced in the supply direction by the pressure medium comprises a pressure rod which is connected to the piston and on which a further piston is axially movable which has a shell which encloses the pressure rodin a sealing manner, the shell guiding the pressure rod at a distance above the piston in a sleeve which is closed at its end and has a smaller inside diameter than the cylinder, the space in the sleeve being filled with a hydraulic liquid.
  • the largest diameter of the device is determined by the cylinder for the lower die pressure.
  • the sleeve for the higher die pressure has a smaller outer diameter. This is achieved in that a pressure intensification is obtained in the space in the sleeve which is filled with hydraulic liquid by means of the shell which is movable on the pressure rod.
  • the pressure intensification is larger as the annular face of the end of the shell is smaller relative to the end of the pressure rod.
  • the annular face of the end of the shell is smaller by a multiple than the end face of the pressure rod which is present opposite to the closed end of the sleeve.
  • the pressure medium which may be, for example, compressed air
  • a partition plate which is connected to the sleeve is provided between the pressure piston and the further piston and through which the pressure rod is guided. In this manner there exists a certain separation between the pressure spaces for the pressure piston and the further piston, in which the pressure spaces have a fixed counter surface.
  • a cylinder 1 of the device according to the invention is secured in a frame.
  • the connection may be carried out, for example, to a plate 3, by means of the screws 5.
  • -A piston 7 is axially movable in the cylinder 1.
  • a drawing die 9 is secured to the piston 7 and projects through the plate 3.
  • pressure medium for example compressed air, is introduced into a pressure space 13 of the cylinder I. Said compressed air influences the piston face 15 and ensures that the piston 15 moves the drawing die up to a workpiece.
  • a pressure rod 17 is secured to the piston 7 and lies in the elongation of the drawing die 9.
  • a partition plate 19 is provided in-the cylinder 1 and provides an upper abutment for the piston 7 and through which the pressure rod 17 projects.
  • the pressure rod 17 continues in a sleeve 21 having a smaller diameter.
  • the sleeve 21 is closed at its upper end 23.
  • the pressure rod 17 terminates near the upper end of the cylinder 21 and is freely movable relative to said end.
  • a shell 25 is axially movable on the pressure rod 17. At its lower end, the shell is connected to a further piston 29 via a flange 27.
  • the pressure rod 17 is guided in the sleeve 21 by the upper end 31 of the shell 25. So the shell 25 is present between the inner wall 33 of the sleeve 21 and the surface 35 of the pressure rod which it encloses in a sealing manner.
  • the cavity 37 between the pressure rod 17, the inner wall 33 of the sleeve 21 and the annular surface 39 of the end 31 of the shell is filled with a hydraulic liquid.
  • a workpiece to be machined is placed below the presure die 9 which is brought upwards in the starting position in which a spacing disc 41 engages the partition plate 19.
  • Compressed air is then admitted to the pressure spaces 13 and 43 via the duct 11.
  • the compressed air acts in the pressure spaces 13 and 43 on the faces 15 and 48 of the pistons 7 and 29.
  • the pistons 7 and 29 move downwards and upwards, respectively, and the drawing die 9 is placed on the workpiece.
  • An intensified pressure is then built up in the pressure spaces 13 and 43 and the annular surface 39 of the shell 25 acts on the pressure liquid. Said pressure liquid influences the upper end face 45 of the pressure rod.
  • the annular surface 39 is smaller by a multiple than the face 45 of the pressure rod, a hydraulic intensification is obtained which corresponds to the ratio of the size of the annular surfaces 39 and 45.
  • the force acting on the upper end face 47 of the sleeve 21 is equal to 4.p.A39 and the pressure on the upper end face of the pressure rod A45 is equal to 3.p.A39.
  • p is the pressure with which the shell is forced upwards by the air pressure in the pressure space 43.
  • the overall force F on the drawing die 9 is 3.p.A39 the pressure on the piston face 15.
  • the device according to the invention cannot only be used in drawing workpieces, such as sheet metal. It may advantageously be used also when a hydraulic supporting device (buffer, shock-absorber) having a small diameter is necessary.
  • a hydraulic liquid for operating the device according to the invention may also be used without further measures.
  • Apparatus operable with a source of compressed fluid, for drawing sheet metal comprising a housing defining therein a tubular bore having an upper part with a closed end and a lower part axially spaced therefrom, a first piston reciprocally movable in said lower part of the bore downward for said drawing operation and also upward, said piston having an exposed upper axial surface, means for communicating said compressed fluid to said exposed top surface for urging said piston downward, a rod extending axially upward from said piston into said upper part of the bore with an annular space defined between said rod and upper part, said rod having a top end and a pressure space is thereby defined between said closed end of the upper part of the bore and said top end of said rod, a second piston recipro- 'cally movable in said bore and comprising a base part with an exposed lower surface, and a sleeve part extending upward from said base and into said annular space, a hydraulic fluid in said annular space, means for communicating said compressed fluid to said exposed lower surface for urging said second
  • Apparatus operable with a source of compressed gas comprising a housing defining therein a tubular bore having a lower part of first diameter and axially spaced therefrom an upper part of smaller diameter with a closed end, first and second pistons in said lower I part with an intermediate space between them, means for communicating said compressed gas to said intermediate space for urging the first piston downward and the second piston upward, a rod thatextends from said first piston upward into said upper part of the housing with an annular space definedtherebetween, the rod having an end adjacent said closed end of said upper part of the bore with a compression space defined befluid in the annular space which acts in said compression space upon the end of said rod and urges same downward as a-supplemental force to said gas pressure which urges said first piston downward.
  • the Assignee should be --U.S. PHILIPS CORPORATION-- Signed and sealed this 4th day of February 1975.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Metal Extraction Processes (AREA)
US00307999A 1971-12-29 1972-11-20 Device in particular for drawing sheet-metal Expired - Lifetime US3808872A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2165252A DE2165252A1 (de) 1971-12-29 1971-12-29 Vorrichtung insbesondere zum ziehen von blechwaren

Publications (1)

Publication Number Publication Date
US3808872A true US3808872A (en) 1974-05-07

Family

ID=5829553

Family Applications (1)

Application Number Title Priority Date Filing Date
US00307999A Expired - Lifetime US3808872A (en) 1971-12-29 1972-11-20 Device in particular for drawing sheet-metal

Country Status (6)

Country Link
US (1) US3808872A (fr)
JP (1) JPS4873307A (fr)
BE (1) BE793367A (fr)
DE (1) DE2165252A1 (fr)
FR (1) FR2167122A5 (fr)
NL (1) NL7217638A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113251026A (zh) * 2021-06-03 2021-08-13 一重集团大连工程技术有限公司 一种用于拉伸机的组合式活塞杆及具有该活塞杆的活塞缸

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1940304A (en) * 1932-02-23 1933-12-19 Bergue S Patents Ltd De Machine for riveting, punching, pressing, stamping, and like operations
GB845150A (en) * 1958-04-30 1960-08-17 Charles Edward Tallis Fluid-actuated mechanism
GB877105A (en) * 1956-09-08 1961-09-13 Victor Louis Achille Coppola B Improved hydraulic head for cutting-out presses

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1940304A (en) * 1932-02-23 1933-12-19 Bergue S Patents Ltd De Machine for riveting, punching, pressing, stamping, and like operations
GB877105A (en) * 1956-09-08 1961-09-13 Victor Louis Achille Coppola B Improved hydraulic head for cutting-out presses
GB845150A (en) * 1958-04-30 1960-08-17 Charles Edward Tallis Fluid-actuated mechanism

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113251026A (zh) * 2021-06-03 2021-08-13 一重集团大连工程技术有限公司 一种用于拉伸机的组合式活塞杆及具有该活塞杆的活塞缸
CN113251026B (zh) * 2021-06-03 2024-02-06 一重集团大连工程技术有限公司 一种用于拉伸机的组合式活塞杆及具有该活塞杆的活塞缸

Also Published As

Publication number Publication date
FR2167122A5 (fr) 1973-08-17
JPS4873307A (fr) 1973-10-03
NL7217638A (fr) 1973-07-03
DE2165252A1 (de) 1973-07-12
BE793367A (fr) 1973-06-27

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