US3435653A - Forming method and apparatus - Google Patents

Forming method and apparatus Download PDF

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Publication number
US3435653A
US3435653A US522284A US3435653DA US3435653A US 3435653 A US3435653 A US 3435653A US 522284 A US522284 A US 522284A US 3435653D A US3435653D A US 3435653DA US 3435653 A US3435653 A US 3435653A
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United States
Prior art keywords
blank
pressure
press
forming
punch
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Expired - Lifetime
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US522284A
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English (en)
Inventor
Joseph A Scaletta
Roland E Miller
John Valek
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Kraft Inc
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Kraft Inc
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    • 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
    • B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
    • 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
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B21D51/2646—Of particular non cylindrical shape, e.g. conical, rectangular, polygonal, bulged

Definitions

  • This invention relates generally to a forming method and apparatus, and more particularly it relates to a method and app-artus for drawing containers having a formed rim in a single stroke of the forming apparatus.
  • the container is preferably constructed with a formed rim which may take the shape of a curled or rolled bead or a generally flat flange.
  • a particularly desirable container is one having a curled rim thereon for appearance and also for sealing of the lid onto the container.
  • it has not been convenient to draw lightweight containers having a formed rim in a single stroke of the forming apparatus. It has been particularly difficult to draw such containers having a large depth as compared to the diameter, generally referred to as deep drawn containers.
  • Deep drawn containers having a curled rim formed in this manner are time consuming to produce, require a number of dies, and the plural drawing operations result in the formation of rough spots and uneveness in the sidewall of the container, and it would be advantageous to provide a method and apparatus for forming a deep drawn container having a curled rim from lightweight aluminum or aluminum alloy stock material in a single drawing operation.
  • Patented Apr. 1, 1969 It is the principal object of the present invention to provide a method and apparatus for forming drawn containers.
  • a further object is to provide a method and apparatus for forming deep drawn containers having a curled rim thereon in a single drawing operation.
  • An additional object is to provide an improved clamping mechanism which provides improved control over the container drawing operation, and eliminates tearing of the stock and the formation of slivers during the drawing operation.
  • FIGURE 1 is a partial schematic view of a form- 7 ing press and its associated hydraulic actuating system, portions of the forming press being illustrated in vertical cross-section;
  • FIGURE 2 is a graph showing the hydraulic pressure on the draw ring of a forming press as a function of the rotation of the press crankshaft;
  • FIGURE 3 is a partial cross-sectional rview of the forming press of FIGURE 1, the press being shown in the position where the blank has been cut from the stock material;
  • FIGURE 4 is similar to FIGURE 3 and shows the press in a partially closed position
  • FIGURE 5 is similar to FIGURES 3 and 4 and shows the press in a fully closed position
  • FIGURE 6 is similar to FIGURE 5 and shows the press after formation of a curled rim on the container.
  • the present invention is directed to a method and apparatus for forming drawn containers having a formed rim in a single stroke of a forming press without attendant problems of slivering and tearing of the edges of the stock material during the forming operation. More specifically, the present invention is directed to a forming press which includes means for forming a blank of stock mateiral to be drawn, means for clamping the edges of the blank during the drawing operation, means for controlling the clamping pressure on the edges of the blank, and means to release the clamping pressure at a particular point during the drawing operation, and to a method of forming deep drawn containers utilizing such a forming press. The invention also contemplates a hydraulic actuated clamping mechanism for clamping and releasing the edges of the blank during the drawing operation.
  • FIGURE 1 there is shown a partial schematic elevational cross-sectional view of a die set 11 of a forming press for forming deep drawn cylindrical containers, and a hydraulic actuating mechanism 12 for controlling the clamping pressure on the edges of the blank during the drawing operation.
  • the parts of the forming press not illustrated such as the ram, crankshaft, and auxiliary support members, may be of any desired configuration, and do not form a portion of the present invention.
  • the press die set 11 includes an upper punch holder 13 and a lower die holder 15.
  • An annular blanking punch 17 is carried by the punch holder, and a cylindrical forming punch 19 is slideably carried within the annular blanking punch 17.
  • One or more hydraulic cylinders 21 having a liner 23 are provided in the punch holder 13.
  • a piston 25 is disposed within the cylinder 21, the piston having a shaft 27 extending from. the cylinder 21 and abutting the upper surface of the forming punch 19 for controlling the movement of the forming punch 19 relative to the blanking punch 17 as explained hereinafter.
  • the hydraulic cylinders 21 is connected to a source of fluid pressure which may be a sump 55 and pressure booster 57 of the hydraulic actuating system 12, or may be a separate hydraulic system, by means of a bore 29 and conduit 30.
  • a solenoid or other suitably operated valve 32 is provided in the conduit 30 for controlling the pressure in the conduit 30.
  • the die holder 15 supports a backing plate 33 upon which is supported an annular yoke 35.
  • An annular draw ring 37 is concentrically mounted within the cavity in the yoke 35 and is adapted for sliding movement relative to the yoke.
  • An annular groove 38 is provided in the draw ring 37 for forming a curled rim on the container as described hereinafter.
  • a cylindrical forming die 39 is mounted on the backing plate 33 centrally of the annular draw ring 37 in a mating position with the forming punch 19 carried by the punch holder 13.
  • the draw ring 37 and the blanking punch 17 cooperate in a manner as hereinafter described to form a gripping means for aligning and gripping the edge of the blank during the drawing operation.
  • One or more hydraulic cylinders 41 are provided in the die holder 15 beneath the draw ring 37 and each is provided with a cylindrical liner 43.
  • a piston 45 is mounted for reciprocating movement within each of the hydraulic cylinders 41, and a shaft 47 is connected to the upper end thereof extending through the backing plate 33.
  • the upper end of the shaft 47 abuts the lower surface of the draw ring 37 and the shaft is of a length so that when the piston 45 is in its uppermost position, as shown in FIGURE 1, the upper surface of the draw ring 37 is even with the upper surface of the yoke 35.
  • a bore 49 is provided in the die holder 15 in fluid communication with the hydraulic cylinders 41, the bore being connected in fluid communication to a conduit 51 of the hydraulic actuating system 12.
  • the hydraulic actuating system 12 includes a sump or reservoir 55 for hydraulic fluid connected to the bore '49 by means of the conduit 51.
  • a pressure booster 57 is positioned in the conduit 51 between the sump 55 and the bore 49.
  • the pressure booster 57 may be connected to a suitable source of air under pressure, not shown, and operates to insure that the hydraulic system 12 and the cylinders 41 are constantly filled with hydraulic fluid.
  • the pressure booster 57 may be controlled by means of a suitable switch 59, which in the embodiment of the invention illustrated in FIGURE 1 is actuated by a cam 61 in response to the stroke of the press as described hereinafter.
  • a check valve 63 is positioned in the conduit 51 between the booster 57 and the cylinders 41 to prevent backflow of hydraulic fluid from the cylinders into the booster during the drawing operation.
  • a pressure relief valve 65 is connected in fluid communication with the conduit 51 between the check valve 63 and the cylinders 41.
  • the pressure relief valve 65 is normally closed and is set to open and relieve the pressure in the cylinders 41 and conduit 51 at a fixed pressure determined by the operating conditions of the press, and it is desirable that the pressure at which the pressure relief valve 65 opens be adjustable for different forming operations and for different materials.
  • the pressure relief valve is connected by a conduit 67 to the sump 55 so that the hydraulic fluid exhausted from the cylinders 41 is returned to the sump 55.
  • Means are also provided in the hydraulic actuating system to rapidly relieve the pressure in the cylinder 41, and to consequently relieve the gripping pressure between the blanking punch 17 and the draw ring 37 during a particular portion of the drawing operation.
  • such means includes a dump valve 69 positioned in a conduit 71 connected to the conduit 51.
  • the dump valve is utilized to rapidly relieve or exhaust substantially all of the pressure within the hydraulic cylinders during a particular portion of the forming operation as described hereinafter.
  • the hydraulic fluid exhausted from the cylinders 41 by the dump valve 69 is returned to the sump 55 by the conduit 71.
  • the dump valve 69 is preferably a fast acting valve, such as a solenoid valve, and may be controlled by a switch 73 responsive to the stroke of the press.
  • the switch 73 may be actuated by a suitable cam 75 which is carried by a crank shaft on the press.
  • the cam 75 is adjusted to actuate the switch during a desired portion of the stroke of the press, thereby instantly relieving the pressure within the hydraulic cylinders 41 and the gripping pressure between the blanking punch 17 and the draw ring 37.
  • the dump valve 69 is opened for only a short period of time during each stroke of the press and the cam 75 is contoured accordingly.
  • FIG- URE 1 shows the position of the press at the beginning of a stroke or cycle of the press at the point where the punch holder 13 and die holder 15 are separated and a sheet of stock material 77 from which the container is to be formed is fed therebetween.
  • FIGURE 2 is a graph of the pressure in the hydraulic cylinders 41 versus the degrees of rotation of the press crankshaft, in the manufacture of the described container. At the beginning of the stroke of the press, the position of FIGURE 1, the crankshaft is at zero degrees rotation.
  • FIGURES 3 to 6 are partial sectional elevational yiews, similar to FIGURE 1, of the forming press, and illustrate the movement of the press during one stroke thereof for forming the described deep drawn container having a curled rim.
  • FIGURE 1 At the beginning of the stroke of the press (FIGURE 1) the punch holder 13 and the die holder 15 are separated and the stock material is fed therebetween by the press feed mechanism.
  • the press crankshaft then commences rotation, causing the punch holder 13 and the die holder 15 to move toward each other to begin the drawmg operation.
  • FIGURES 3 to 6 show the die holder as being stationary and the punch holder as reciprocating down and up during each stroke of the press.
  • the draw ring 37 At the beginning of the stroke of the press, the draw ring 37 is in its uppermost position, FIGURE 1, and the hydraulic cylinders 41 are filled with hydraulic fluid due to the action of the booster 57 during the previous stroke of the press.
  • the pressure in the cylinders 41 is relatively low, about 50 p.s.i.g.
  • the pressure relief valve 65 which may be set to open at a pressure of about 1200 p.s.i.g., is closed and the cam actuated dump valve 69 is also closed.
  • the check valve 63 prevents back flow of hydraulic fluid from the cylinders 41 and it can be seen that a closed and filled hydraulic system is established which acts to retain the draw ring 37 in its extended position.
  • An increasing gripping pressure is desired as the drawing operation continues due to increased tensile forces exerted during drawing and stretching of the blank into the desired shape.
  • the desired gripping pressure may be adjusted for a particular drawing operation by proper selection of the size of the pistons 45 and the pressure established in the cylinders 41 at the beginning of the drawing operation.
  • the gripping pressure applied to the edge 81 of the blank 79 by the blanking punch 17 and the draw ring 37 is selected so that as the drawing operation proceeds the tensile forces applied to the edge 81 of the blank 79 by the stretching of the blank during the drawing are suflicient to cause the edge 81 to be slowly pulled from between the blanking punch 17 and the draw ring 37.
  • the edge 81 of the blank 79 has partially withdrawn from between the blanking punch 17 and the draw ring 37.
  • the drawing operation proceeds and the pressure in the hydraulic cylinders 41 continues to build up until the preselected maximum pressure is reached, at which time the pressure relief valve 65 opens and the hydraulic fluid is exhausted to the sump 55.
  • the pressure relief valve is set to open at a pressure of about 1200 p.s.i.g., the maximum pressure established in the cylinders 41 is 1200 p.s.i.g. At a pressure of 1200 p.s.i.g.
  • the tensile forces created in the blank during the forming operation continue to withdraw the edge 81 of the blank from between the blanking punch 17 and the draw ring 37
  • the forming punch 19 engages the blank and the container is shaped between the forming punch 19 and the forming die 39.
  • the annular edge 81 of the blank 79 continues to be further withdrawn from between the blanking punch 17 and the draw ring 37.
  • the gripping pressure applied to the edge 81 of the blank 79 is released just prior to the time at which the edge of the blank would be pulled from between the gripping means by the tensile forces created in the blank during the drawing operation.
  • the gripping pressure is released by actuation of the dump valve 69 at the point when about to it, of an inch of the edge 81 of the blank 79 is held between the draw ring 37 and the blanking punch 17.
  • the dump valve 69 is actuated by the cam 75 which is carried by the press crankshaft to rapidly relieve the pressure within the hydraulic cylinders 41 which releases the edge 81 of the blank 79 from between the blanki g punch 17 and the draw ring 37. This release of the pressure within the cylinder is timed so as to coincide with the bottoming or mating of the forming punch 19 and the forming die 39.
  • the actuation of the dump valve 69 is carried out at a point between about and of rotation of the cam 75, as shown in FIGURE 2.
  • the punch holder 13 and the die holder 15 separate and the container is ejected by means of a knockout pin 83.
  • the pressure in the hydraulic cylinders 41 causes the draw ring 37 to move upwardly until it returns to the position of FIGURE 1.
  • the valve 32 is also opened to relieve the pressure in the cylinders 21.
  • Such a valve should include a pressure relief mechanism for relieving the pressure within the hydraulic cylinders when the pressure exceeds the desired amount, and also includes a solenoid or other means of actuation for overriding the pressure relief and dumping the hydraulic fluid from the hydraulic cylinders to relieve the gripping pressure during that portion of the stroke of the press where it is desired to release the edge of the blank from between the blanking punch and the draw ring.
  • a solenoid operated dump valve 69 as illustrated in FIGURE 1, and to also include an overriding mechanism in the pressure responsive valve 65 so that both the dump valve and the pressure responsive valve may be utilized to rapidly relieve the pressure from the hydraulic cylinders at the point that it is desired to release the edge of the blank from between the blanking punch and the draw ring. It has been found to be particularly desirable to relieve the pressure within the hydraulic cylinders as rapidly as possible and it has been found that the use of two lines and two valves to dump the fluid pressure has provided generally better results than a single line, particularly where the fluid lines and the valves have a small capacity.
  • a method for forming drawn containers comprising disposing essentially the entire edge portion of a blank from which the container is to be formed between a pair of opposed clamping members and applying a clamping force thereto by means of said clamping members, effecting contact between the blank and a drawing die to commence a drawing operation while maintaining the clamping force on the blank, limiting the magnitude of the clamping force on the blank to a predetermined maximum so as to permit a gradual but not complete withdrawal of the blank from between the clamping members as the drawing operation progresses, relieving essentially all of the clamping force so as to release the edge portion of the blank before the stress in the edge portion of the blank is sufficient to fracture the blank in such edge portion and before any portion of said edge portion has become fully withdrawn from between the clamping members, drawing the edge portion so released around the die, and forming the released edge portion of the blank into a bead while maintaining the blank stationary relative to the drawing die.
  • a press for forming drawn containers comprising a pair of opposed clamping members adapted to engage therebetween essentially the entire edge portion of a blank to be formed, means for applying a clamping force to said edge portion of said blank by means of said clamping members, a drawing die, means for effecting contact between the blank and said drawing die to commence a drawing operation while maintaining the clamping force on the blank, means for limiting the magnitude of the clamping force on the blank to a predetermined maximum so as to permit a gradual withdrawal of the blank from between the clamping members as the drawing operation progresses, means for relieving essentially all of the clamping force so as to release the edge portion of the blank before the stress in the edge portion of the blank is suflicient to fracture the blank in such edge portion and before any portion of said edge portion has become fully withdrawn from between the clamping members, means for drawing the edge portion so released around the die, and means for forming the released edge portion of the blank into a head while maintaining the blank stationary relative to the drawing die.
  • a press in accordance with claim 6, wherein said pressure-increasing means is a pressure booster in said conduit, wherein means are provided responsive to the stroke of the press for actuating said pressure booster to rapidly increase the pressure applied to said blankengaging portion of said clamping means subsequent to the opening and closing of said dump valve.
  • said clamping means comprises a blanking punch for forming a blank from a sheet and a draw ring positioned opposite said blanking punch, and wherein said draw ring is provided with a groove adapted to engage the edge of the blank and form said edge into a curled rim.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US522284A 1966-01-21 1966-01-21 Forming method and apparatus Expired - Lifetime US3435653A (en)

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US52228466A 1966-01-21 1966-01-21

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BE (1) BE692967A (en])
DE (1) DE1602515A1 (en])
FR (1) FR1508614A (en])
GB (1) GB1153664A (en])

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3704618A (en) * 1970-10-28 1972-12-05 Reynolds Metals Co Method and apparatus for making a drawn article
US3759079A (en) * 1970-06-13 1973-09-18 Zaklad Doswiadczalny Pras Auto Punching and forming tool with straightening facility for metal strip
US4125009A (en) * 1977-04-28 1978-11-14 The Stolle Corporation Blank and draw apparatus with gap control
US4309888A (en) * 1976-07-22 1982-01-12 Kraftco Corporation Apparatus for forming a container pan
US4413500A (en) * 1979-12-26 1983-11-08 Hughes Aircraft Company Tool for forming precisely curved surfaces
US4599885A (en) * 1981-03-06 1986-07-15 Stone Harris E Cold drawing a disk into a cap for a paper core
US4627256A (en) * 1979-12-26 1986-12-09 Hughes Aircraft Company Method of forming precisely curved surfaces
US4669298A (en) * 1982-08-30 1987-06-02 Amada Company, Limited Press
US5572896A (en) * 1994-02-25 1996-11-12 Aluminum Company Of America Strain path control in forming processes
US7237423B1 (en) * 2004-11-12 2007-07-03 Miller Tool And Die Company Inc. Apparatus for stretch forming blanks
US20080295563A1 (en) * 2006-01-18 2008-12-04 Mehmet Terziakin Method for Delaying of Cooling and Hardening of Desired Zones of a Sheet During a Hot Metal Stamping Process
CN102049446A (zh) * 2010-11-18 2011-05-11 江苏大学 一种用于正反拉伸制件的变工序冲压模具
US20120137747A1 (en) * 2009-08-12 2012-06-07 Wayne Bruce Cornish Forging die apparatus for steering racks
CN104760323A (zh) * 2015-03-30 2015-07-08 王宏斌 一种能及时散热的成型模具装置及其使用方法
EP3175936A1 (en) * 2015-12-01 2017-06-07 Aida Engineering, Ltd. Slide cushion device of press machine
CN112743891A (zh) * 2020-12-23 2021-05-04 无锡市欧凯电子有限公司 一种下模随动结点正置曲柄压力机系统
CN120134702A (zh) * 2025-05-13 2025-06-13 金丰（中国）机械工业有限公司 一种冲床滑块下死点位置的动态补偿方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1166653B (it) * 1979-02-22 1987-05-06 Galdabini Renzo Pressa idraulica per imbutitura con recupero di energia
DE3022844A1 (de) * 1980-06-19 1982-01-07 Uniplanung Metall- und Kunststoffengineering GmbH & Co KG, 7552 Durmersheim Einrichtung an werkzeugen oder pressen zum ziehen von blechformteilen
DE102007005011B4 (de) 2007-02-01 2012-09-06 Saeta Gmbh & Co. Kg Verfahren und Ziehwerkzeug zum Tiefziehen von Rohlingen aus Blechmaterial zu flanschlosen Formlingen
DE102012208137B4 (de) * 2012-05-15 2017-01-12 Marbach Werkzeugbau Gmbh Thermoformwerkzeug zur Herstellung von becherförmigen Gegenständen aus einer erwärmten Kunststofffolie

Citations (6)

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US1482732A (en) * 1922-08-15 1924-02-05 Calleson Amos Apparatus for forming sheet-metal caps
US2192778A (en) * 1940-03-05 Drawing press
US3085530A (en) * 1958-10-22 1963-04-16 Floyd M Williamson Hydraulic press ram cushion
US3147722A (en) * 1961-05-19 1964-09-08 Dro Engineering Company Di Die pads for ram type presses
US3292415A (en) * 1964-01-27 1966-12-20 Krause Ass F A Pressurized fluid supply system
US3296850A (en) * 1964-08-25 1967-01-10 Rauland Corp Mask forming

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2192778A (en) * 1940-03-05 Drawing press
US1482732A (en) * 1922-08-15 1924-02-05 Calleson Amos Apparatus for forming sheet-metal caps
US3085530A (en) * 1958-10-22 1963-04-16 Floyd M Williamson Hydraulic press ram cushion
US3147722A (en) * 1961-05-19 1964-09-08 Dro Engineering Company Di Die pads for ram type presses
US3292415A (en) * 1964-01-27 1966-12-20 Krause Ass F A Pressurized fluid supply system
US3296850A (en) * 1964-08-25 1967-01-10 Rauland Corp Mask forming

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3759079A (en) * 1970-06-13 1973-09-18 Zaklad Doswiadczalny Pras Auto Punching and forming tool with straightening facility for metal strip
US3704618A (en) * 1970-10-28 1972-12-05 Reynolds Metals Co Method and apparatus for making a drawn article
US4309888A (en) * 1976-07-22 1982-01-12 Kraftco Corporation Apparatus for forming a container pan
US4125009A (en) * 1977-04-28 1978-11-14 The Stolle Corporation Blank and draw apparatus with gap control
DK156034B (da) * 1977-04-28 1989-06-19 Stolle Corp Fremgangsmaade og indretning til ved dybtraekning i en presse at forme en skaal udfra et metalemne
US4413500A (en) * 1979-12-26 1983-11-08 Hughes Aircraft Company Tool for forming precisely curved surfaces
US4627256A (en) * 1979-12-26 1986-12-09 Hughes Aircraft Company Method of forming precisely curved surfaces
US4599885A (en) * 1981-03-06 1986-07-15 Stone Harris E Cold drawing a disk into a cap for a paper core
US4669298A (en) * 1982-08-30 1987-06-02 Amada Company, Limited Press
US5572896A (en) * 1994-02-25 1996-11-12 Aluminum Company Of America Strain path control in forming processes
US7237423B1 (en) * 2004-11-12 2007-07-03 Miller Tool And Die Company Inc. Apparatus for stretch forming blanks
US20080295563A1 (en) * 2006-01-18 2008-12-04 Mehmet Terziakin Method for Delaying of Cooling and Hardening of Desired Zones of a Sheet During a Hot Metal Stamping Process
US20120137747A1 (en) * 2009-08-12 2012-06-07 Wayne Bruce Cornish Forging die apparatus for steering racks
CN102049446A (zh) * 2010-11-18 2011-05-11 江苏大学 一种用于正反拉伸制件的变工序冲压模具
CN102049446B (zh) * 2010-11-18 2013-01-23 江苏大学 一种用于正反拉伸制件的变工序冲压模具
CN104760323A (zh) * 2015-03-30 2015-07-08 王宏斌 一种能及时散热的成型模具装置及其使用方法
CN104760323B (zh) * 2015-03-30 2016-10-26 广东龙泽精密组件有限公司 一种能及时散热的成型的模具装置及其使用方法
EP3175936A1 (en) * 2015-12-01 2017-06-07 Aida Engineering, Ltd. Slide cushion device of press machine
CN106807842A (zh) * 2015-12-01 2017-06-09 会田工程技术有限公司 压力机的滑动缓冲装置
US9808849B2 (en) 2015-12-01 2017-11-07 Aida Engineering, Ltd. Slide cushion device of press machine
CN112743891A (zh) * 2020-12-23 2021-05-04 无锡市欧凯电子有限公司 一种下模随动结点正置曲柄压力机系统
CN112743891B (zh) * 2020-12-23 2022-11-25 湖南大力科技咨询有限公司 一种下模随动结点正置曲柄压力机系统
CN120134702A (zh) * 2025-05-13 2025-06-13 金丰（中国）机械工业有限公司 一种冲床滑块下死点位置的动态补偿方法

Also Published As

Publication number Publication date
GB1153664A (en) 1969-05-29
FR1508614A (fr) 1968-01-05
DE1602515A1 (de) 1970-04-23
BE692967A (en]) 1967-07-03

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