US3599473A - Stamping press - Google Patents

Stamping press Download PDF

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Publication number
US3599473A
US3599473A US820497A US3599473DA US3599473A US 3599473 A US3599473 A US 3599473A US 820497 A US820497 A US 820497A US 3599473D A US3599473D A US 3599473DA US 3599473 A US3599473 A US 3599473A
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US
United States
Prior art keywords
press
piston
guide
cylinder
cone
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
US820497A
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English (en)
Inventor
Walter Wanner
Heinz Lampert
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.)
Schaeffler Schweiz GmbH
Original Assignee
Hydrel AG
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 Hydrel AG filed Critical Hydrel AG
Application granted granted Critical
Publication of US3599473A publication Critical patent/US3599473A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/04—Frames; Guides

Definitions

  • the press for example, can be a precision stamping press having a vertically movable lower tool-holding table operated by a piston in a cylinder and an upper tool-holding table rigidly mounted in the frame.
  • the purpose of the invention is to facilitate the assembly and disassembly of presses, an advantage of some importance with mechanical presses, but of particular significance with hydraulic presses, which have gaskets, positioned between the cylinder and piston, that must be replaced periodically.
  • FIG. I is a diagrammatic view in partial vertical section of an embodiment of the invention.
  • FIG. 2 is a top view ofthe embodiment shown in FIG. 1;
  • FIG. 3 is a sectional view on expanded scale of a detail of the embodiment shown in FIG. 1;
  • FIG. 4 is a bottom view on enlarged scale ofa guide cone.
  • the illustrated precision stamping press has two oppositely disposed uprights 1, between which two easily dismountable parts, an upper subunit 2 and a lower subunit 3, are held.
  • the two uprights are connected together at the top and bottom by respective pairs of horizontal tension bolts 4 and nuts 5.
  • the upper part 2 comprises a hydraulic cylinder 6 having an auxiliary piston 7 composed of a crown 7a and a cylindrical body 7b held together by a ring of bolts 8.
  • a connection hole 9 for an oil line (not shown) leads to the interior 10 of the cylinder.
  • the piston 7 is precisely guided in its stroke by two guide arrangements 11 and 12, the latter being shown on en-Inventged scale in FIG. 3. The two guide arrangements will be explained in detail.
  • the cylinder 6 consists of an upper part 6a and a lower part, or flange, 6b held together by a ring of bolts 13.
  • the upper part 6a is constructed as a round body, but the flange 612 has only a round internal bore, whereas its outer part constitutes a rectangular flange projecting beyond the outer face of the upper part 6a.
  • Two oppositely disposed sides 14 of the flange 6b engage in guideways 15 provided in the uprights I and rest on two gently sloping wedges 16, also held in the guideways.
  • the front ends 16a see FIG.
  • the latter first of all must be hung from a travelling crane or supported on a fork lift, in a manner not shown. After removing the cotters 19, the wedges 16 are knocked out of the guideways l5 and withdrawn. Next, the upper bolts 4 are removed, enabling the subunit 2 to be moved backwards or forwards horizontally until the flange 6 is free of the guide ways 15, completely freeing the subunit 2 from the uprights 1. When assembling the subunit 2 on the upright, the sequence of steps, of course, is reversed.
  • the subunit 2 also comprises an upper tool holding table 20, which a ring of bolts 21 and spacers 22 hold fixed at a certain distance from the flange 6b.
  • the piston 7 is shown in FIG. 1 in its lowest position, resting on a plate 23, which lies loosely on the table and is connected in a known manner by bolts (not shown) passing through openings in the table 20 with a toothed ring not shown) that serves to hold the metal to be stamped, as is customary with precision stamping presses.
  • the subunit 3 has a hydraulic cylinder 25 comprising an axially symmetrical bottom part 25a and a square flange 25b held together by a ring of bolts 26. Two opposite sides 27 of the flange 25b are held in two guideways 28 of the uprights 1. In these guideways and above the flange .2512, two wedges 16 are arranged in the same manner as explained in connection with the subunit 2.
  • the cylinder bottom part 25a extends into a wall 29 that is provided in the press foundation between the uprights 1 and which extends forwards and/or backwards from the press.
  • the subunit 3 To remove the subunit 3, it is supported on a low truck (not shown) in the well 29, and the lower wedges 16 then removed.
  • the subunit 3 can now be moved forwards or backwards until the flange 25b is free of the guideways 28, and then, if necessary, raised out ofthe well by a crane or similar machine.
  • the main piston 30 of the press operates in the cylinder 25.
  • the main piston is a trunk piston and forms the hydraulic cylinder for an ejector piston 31.
  • the main piston 30 consists of a crown 30a a body 30b and an upper part 30c all held together by two rings of bolts 32 and 33.
  • the cylinder chambers 34 is connected to a line (not shown) for hydraulic oil by a connection opening 35.
  • a series of bosses 36 projecting from the piston crown 300 support the piston 30 in its lowest position on the bottom of the cylinder 25.
  • Two guide arrangements 37 and 38 having the same construction as the guide arrangements 11 and 12, precisely guide the piston 30 in its stroke.
  • the lower tool holding table 24 is rigidly connected to a cylindrical sleeve 39 that surrounds the piston upper part 30c and forms with the latter an annular chamber 40, which, in a manner not illustrated, is connected to a compressed air line for tool protecting, as is well known.
  • the table 24 is shown in FIG. 1 in its bottom position, resting on the piston upper part 30C.
  • a loose plate 41 which bolts 42 passing through holes in the table 24 connect in a known manner with an ejector 84 for removing the finished stamped metal part.
  • the ejector piston 31 also acts during the pressing operation as a back pressure piston.
  • the guide arrangement 12 shown on enlarged scale in FIG. 3, comprises an annular, elastically yielding guide cone 45 surrounded by an annular clamping cone 46, ofwhich the conical inner face 47 defines the same apical angle as the conical outer face 48 of the guide cone 45.
  • Both cones 45 and 46 are held in a cylindrical ring chamber 49 of the flange 6b. This chamber is open at the top.
  • a thin thrust ring 51 is positioned between the bottom 50 of the chamber 49 and the clamping cone 46.
  • a gasket 52 for sealing thepiston 7 from the cylinder 6 is held in a smaller cylindrical ring chamber provided below the chamber 49 in the flange 6b.
  • the cylindrical inner face of the guide cone 45 has a low-friction synthetic plastic lining 53, which presses against, and guides the movement of, the piston cylindrical body 7b.
  • a corresponding synthetic plastic lining 53a is provided on the cylindrical outer face of a guide cone 45a comprised by the guide arrangement 11. The parts rigid with the cylinder and the piston contact each other only on the exposed surfaces of the linings 53 and 53a and of the relatively soft and yielding gasket 52.
  • the guide cone 45 is somewhat shorter than the clamping cone 46 and is pressed downwards by a set of stiff cup springs 54.
  • the wedge action of the clamping cone 46 consequently presses inwards on the elasticity yielding guide cone 45, which is caused to press radially against the piston body 7b, as indicated by the arrow.
  • FIG. 4 shows that the elastic yieldingness of the guide cone is chiefly obtained by a series of radial slits 55, which terminates at their outer ends in enlarged recesses 56 and divide the cone 45 into sectors 57 that are connected together only by a thin web at the inner ends of the slits S5.
  • each sector 57 embodies a recess 59 for freely accommodating the head 60 of a screw 61.
  • the screw 61 is turned into the threaded hole 62 of a ring 63 held in an annular opening 64 of the cylinder upper part 6a.
  • the cup springs 54 are arranged on the screws 61 and are located for the most part in a coaxial enlargement 65 of the hole 62. The cup springs are tightly compressed between the screw head 60 and a stop plate 66, when the guide arrangement is assembled.
  • the guide arrangement 11 is constructed in substantially the same way as the guide arrangement 12 the corresponding parts being denoted by the same reference numerals with an added sulfix a.
  • the guide cone 451 is not pressed radially inwards against the piston 7, but instead radially out wards against the cylinder 6.
  • a further difference is that there is no annular clamping cone, since the piston crown 7a itself embodies a conical clamping surface 47a.
  • the clamping cone 46 can be made as a unitary piece with the flange 6b in the guide arrangement 12. But in this case the gasket 52 is no longer easily accessible.
  • the parts of the guide arrangements 37 and 38 are denoted by the same reference numerals as the corresponding parts of the respective arrangements 11 and 12, from which they differ only in being turned upside down.
  • Two gaskets 68 and 69 are provided between the cylinder and the main piston 30.
  • the gasket 68 corresponds substantially to the gasket 52
  • the gasket 69 is composed, in a manner conventional but not illustrated, of a pressure-resistant annular mount and of a soft, yielding sealing part, because after each working stroke of the main piston hydraulic oil is let into the annular slot 70 between the piston 30 and the cylinder 25 to press on the armored gasket 69 and the guide arrangement 37 and quickly push the piston 30 down.
  • a connection opening 71 is provided in the cylinder bottom part 25a for connection to the necessary oil line.
  • the gaskets 68 and 69, as well as the gaskets (not shown) for the ejector piston 31, must be renewed oftener than the gasket 52 in the subunit 2, since the gaskets located in the subunit 3 wear faster because of the high oil pressure and longer piston stroke. Consequently, it is particularly advantageous that the subunit 3 can be taken apart without first having to remove the subunit 2 from the uprights 1.
  • the described guide arrangements 11,12 and 37, 38 are free of play and in regard of manufacturing cost and satisfactory performance far'more advantageous than the hitherto customary very long and rigid guides having rolling elements. With these previous guide arrangements it would have been scarcely possible so to construct the units 2 and 3 that they can-as described-be removed from the uprights 1 like pulling out a drawer. But it is also apparent that the guide arrangements of the invention are also advantageously used in presses that do not permit the individual parts to be removed like a drawer.
  • the working stroke of the press can be either vertical or horizontal.
  • the subunits 2 and 3 can also be connected to the uprights 1 by bolts that replace the tension bolts 4.
  • a press including a frame, two tool holders (20, 24) relatively movable with respect to each other, and wherein the improvement comprises a frame comprising two members, two pairs of oppositely disposed guideways (15, 28) in said two members, two flanges (6b, 2512) having two parallel sides that are held in respective pairs of said guideways, two respective press subunits (2, 3) comprising each a pair ofsaid flanges and a respective said tool holder, and removable fastening elements (4) for clamping the said sides of a respective said flange in the corresponding said guideways, whereby each said subunit can be moved along the corresponding pair of guideways to be removed from, or replaced in, said frame independently of the other by removal ofsaid fastening means.
  • reciprocatory member (7, 30) comprised by at least one of said press subunits and movable in the longitudinal direction of said press frame, at least one guide arrangement (11, 12, 37, 38) for guiding said reciprocatory member without play along its path of movement, an annular, elastically yielding guide cone (45, 45a) comprised by said guide arrangement, said guide cone embodying a conical face (48, 48a) and an opposite cylindrical guide face, a conical surface (47, 47a) having the same conieity as said conical face and against which said conical face presses, and means (54, 54a") for exerting an axial force on said guide cone for causing said cylindrical guide face thereof to exert pressure elastically and radially.
  • at least one gasket (52, 68, 69) arranged between said cylinder and piston, and wherein one of said flanges partly forms said cylinder, at least two separate parts (6a, 6b, 25a; 7a, 7b; 30a, 30b, 300) for forming each of said piston and said cylinder, and bolts (8, 13, 26, 32, 33) for holding together the said piston and cylinder parts for permitting said gasket to be easily replaced after removal ofsaid subunit from said press frame.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Automatic Assembly (AREA)
  • Presses And Accessory Devices Thereof (AREA)
US820497A 1968-05-02 1969-04-30 Stamping press Expired - Lifetime US3599473A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH653068A CH490962A (de) 1968-05-02 1968-05-02 Presse

Publications (1)

Publication Number Publication Date
US3599473A true US3599473A (en) 1971-08-17

Family

ID=4311042

Family Applications (1)

Application Number Title Priority Date Filing Date
US820497A Expired - Lifetime US3599473A (en) 1968-05-02 1969-04-30 Stamping press

Country Status (5)

Country Link
US (1) US3599473A (enrdf_load_stackoverflow)
JP (1) JPS506061B1 (enrdf_load_stackoverflow)
CH (1) CH490962A (enrdf_load_stackoverflow)
DE (1) DE1921584A1 (enrdf_load_stackoverflow)
GB (1) GB1274303A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0340943U (enrdf_load_stackoverflow) * 1989-08-31 1991-04-19

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US545758A (en) * 1895-09-03 Frame for forging
GB937635A (en) * 1961-07-14 1963-09-25 Lugwig Gack Machine frame for forging hammer
US3321952A (en) * 1964-09-22 1967-05-30 Bliss E W Co Press ram guiding arrangement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US545758A (en) * 1895-09-03 Frame for forging
GB937635A (en) * 1961-07-14 1963-09-25 Lugwig Gack Machine frame for forging hammer
US3321952A (en) * 1964-09-22 1967-05-30 Bliss E W Co Press ram guiding arrangement

Also Published As

Publication number Publication date
GB1274303A (en) 1972-05-17
JPS506061B1 (enrdf_load_stackoverflow) 1975-03-10
DE1921584A1 (de) 1969-10-16
CH490962A (de) 1970-05-31

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