US3563167A - Frames for presses - Google Patents

Frames for presses Download PDF

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Publication number
US3563167A
US3563167A US747857A US3563167DA US3563167A US 3563167 A US3563167 A US 3563167A US 747857 A US747857 A US 747857A US 3563167D A US3563167D A US 3563167DA US 3563167 A US3563167 A US 3563167A
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United States
Prior art keywords
subframe
subframes
press frame
platens
frame
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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
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US747857A
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English (en)
Inventor
John Antony Pennell
Alan Saunders
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Vickers Ltd
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Vickers Ltd
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Publication date
Application filed by Vickers Ltd filed Critical Vickers Ltd
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Publication of US3563167A publication Critical patent/US3563167A/en
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    • 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
    • B30B15/048—Laminated frame structures

Definitions

  • ABSTRACT A press frame made up from a number of [541 51131122212233.2:32:15 zsi'szszz'xzss'zsiiifl 9Claims,6Drawing Figs.
  • the whole press frame of the invention has very low-stress concentration factors, and very efficient utilization of the constructional material. This allows high nominal stresses without any danger of fatigue failure, and enables the construction of very light high-capacity presses. For a given size and weight, the press frame of the invention is more rigid than most other types due to the absence of clamped joints and regions of highstress concentration. 1
  • press frame of the invention A number of other advantages result in the press frame of the invention.
  • an intensifier cylinder can be attached to the platen so that the cylinder is free from indeterminate axial stresses, and, if single acting, is entirely free of atkind. It is thus possible to raise the working stresses in the cylinder as well, with further reductions in weight and cost. Very high hydraulic pressures are also more easily accommodated allowing the design of extremely compact high-capacity presses.
  • FIG. 1 shows a press frame of the invention in front elevation
  • FIG. 2 is a section taken along line A-A of FIG. 1;
  • FIG. 3 is an isometric view to an enlarged scale of a detail of FIGS. 1 and 2 showing the attachment of a slide surface to subframe member edges, the slide surface having reduced thickness and width near its end;
  • FIG. 4 is a view similar to that of FIG. 3 but showing use of stress-relieving slots in the slide surface together with reduced width;
  • FIG. 5 is a section through part of a press frame showing the attachment of an intensifier cylinder to a platen
  • FIG. 6 is a section through part of a press frame showing alternative constructions of subframes for very large presses.
  • FIGS. 1 and 2 a press frame of the invention suitable for a vertical hydraulic press is shown in FIGS. 1 and 2.
  • the press frame of the invention is made up of a plurality of platelike subframes 3, in this case four in number, each defining a frame opening and being arranged in substantially parallel relationship with the frame openings in register, and two platens 1 and 2 which extend through the registering frame openings in facing spaced parallel relationship.
  • the backs of the platens 1 and 2 are secured, as at 15, respectively along facing inner edges of opposing members 4 and S of each subframe 3.
  • each subframe 3' consists of upper and lower transverse members 4 and 5 together with vertical side members 6.
  • Parallel facing slide surfaces 7 to guide the moving parts of the press are provided by plates or plate means, as shown, disposed substantially perpendicular to the platens I and 2 and are secured within the registering frame openings by welding to inner edges, as at 14, of the subframe vertical side members 6 which edges and members 6 extend at right angles to the edges of the members 4 and 5 carrying the platens l and 2
  • Edges of the subframe members 6 to which the plates having the slide surfaces 7 are attached are each profiled to provide a rebate at point 13 at each end of the associated surfaces 7 so that the plates having these surfaces 7 are attached to inward projecting extensions 8 of the side members 6.
  • FIG. 2 shows a section through the press frame on a vertical plane perpendicular to the subframes 3. Due to the distributed load over the upper and lower platens-1 and 2, these will tend to bend in the plane of FIG. 2, as beams supported at the points of attachment to the transverse members 4 and 5 of the subframes. These deflections will, in turn, tend to cause bending of the side members 6 in this plane, with consequent deflections of the slide surfaces 7 in the same plane.
  • This effeet can also be eliminated if the transverse spacing between adjoining subframes 3 in the section shown in FIG. 2 is selected in conjunction with the relative thickness of the pairs of frame members 5', 5", etc., to eliminate bending moments in the subframes 3 other than those in the plane of FIG. I.
  • FIG. 5 A way of detachably securing a press cylinder such as a hydraulic intensifier cylinder'l8 to the press frame is shown in FIG. 5.
  • the cylinder 18 is of plaincylindrical construction made of high-grade steel if necessary and having a very high working stress level to minimize its weight and overall diameter.
  • Pressure fluid to actuate a moving part of the press (not shown in the FIG.) is supplied to the cylinder via a bore 19 in the press end platen 1.
  • An upper open end of the cylinder 18 is closed by a disc or annulus 20 which is provided with a hydraulic seal 21 around the lower end of its outer edge which engages the bore of the cylinder 18.
  • the disc 20 also provides reinforcement for the platen 1 to which it is secured relatively lightly, such as by bolts 22, or by any other convenient means, and it may also incorporate a supply nozzle to engage the pressure fluid supply bore 19, or a guide bush for the rear of the moving press part.
  • a taper 24 or a recess 24a is formed on either the inside or outside diameter of the cylinder 18 to engage a suitable projecting rim on either the disc 20 or an annular clamp ring 24b surrounding the cylinder and also bolted to the upper platen 1.
  • the method of manufacturing a press frame of the invention as hereinbefore described and as shown in FIGS. 1 to 5 of the drawings comprises the steps of aligning a plurality of subframes 3 substantially parallel to one another with their frame openings in register, fixedly securing the platens l and 2 and the plates having the slide surfaces 7 to the inner edges of respective subframe members 4, 5 and 6 within the frame openings to interconnect the subframes 3 and then prestressing the interconnected subframes 3.
  • This prestressing of the press frame is accomplished after completing the fabrication, heat treatment, and rough machining of the interconnected subframes, the latter including the boring of all essential holes in the structure.
  • This prestressing is achieved by applying a proof load between the platens of about I50 percent of the normal press frame working load. This load causes localized yielding to take place in the regions of the press frame of highest stress concentration and sets up beneficial residual compressive stresses at these regions.
  • the press cylinder itself can be used to supply the required prestressing load, in conjunction with a suitable hydraulic supply, at a pressure greater than the normal working pressure, and a rigid loading frame. In this way the press cylinder itself may also be slightly autofrettaged, together with its attachment to the frame.
  • This press frame comprises a number of subframes 3 each having transverse and vertical members as before, but each incorporating only a platen support 25 at each end.
  • These platen supports are fillet welded to the transverse members 4, as shown at 26, using a simple plate for the platen support, or alternatively a number of T-sectioned elements 27 are buttwelded to the transverse members as shown at 28 to constitute the part platen supports.
  • This latter form of construction allows more control over the profile of the fillet, and is tobe preferred.
  • the part platen supports 25 or 27 at each end of the press frame only extend to about the midpoint of the space between each pair of subframes 3.
  • the subframes can thus be stacked side by side with the part platen supports in contact, or slightly separated as shown in FIG.
  • This press frame is held together by clamping the subframes transversely, or by attaching the outer or all of the part platen supports 25 or 27 to a single platen member 30, either by bolts 31, spigots. (not shown) or by some other suitable means.
  • the bolts etc. are located in the region of relatively low-stress level to avoid weakening the frame,
  • the platen member 30 is conveniently a replaceable hardwearing plate.
  • a similar technique of construction can also be used at the joint 14 (FIG. 1) between the side members 6 and the plates carrying the machine slide surfaces 7.
  • Narrow slide supports, similar to the part platen supports 25 or 27 are welded to the side members of each subframe 3, with the whole assembly of subframes being held together as required by a relatively thin hard-wearing slide surface plate similar to the platen member 30, which is bolted to the various narrow slide supports.
  • the plates slide surfaces 7 are thus easily replaceable.
  • the method of manufacturing a press frame as shown in and described with reference to FIG. 6 comprises first prestressing each subframe 3 individually by applying between the part platen supports 25 or 27 thereof, a load sufficient to cause localized yielding in regions in the subframe 3 of highest stress concentration.
  • a plurality of prestressed subframes 3 are then aligned substantially parallel to one another with their frame openings, part platen supports 25 or 27 and supports (not shown) in registry with one another and the aligned subframes are then secured together by means of platen members 30 and slide surface plates as hereinbefore described.
  • each subframe in the press is designed to carry a definite proportion of the total press force, independently of the others, the various connecting parts such as the platen member 30, do not transmit appreciable forces between the subframes 3, and can therefore be made relatively light. They can thus be attached (to the outer subframes 3 only, if required) to any point where the stress concentration due to bolting is acceptable that is particularly in regions of low stress.
  • the spacing between adjacent platelike subframes 3 of the frame is determined primarily by the bending characteristics of the platens in the plane perpendicular to the press frame, and by the requirement for uniform loading of the subframes 3. Some latitude is possible, however, especially if the subframes 3 are not all of the same thickness, and the space between them can then be utilized to accommodate pipe or cable runs, limit switches, or auxiliary worksaving rams.
  • the latter are conveniently mounted on extensions of themain press platens 1, 2, or on auxiliary platens attached to the press frame in regions of relatively low-stress level.
  • a press frame comprising:
  • plate means providing slide surfaces along inner edges of each said second pair of subframe members, said slide surface plate means being located substantially at right angles to said platens and each said plate means being secured across corresponding subframe member edges of at least two adjoining subframes so as to span said corresponding subframe member edges.
  • a press frame comprising:
  • plate means providing a slide surface along an inner edge of each said second pair of subframe members, said slide surfaces being located substantially at right angles to said platens;
  • each subframe member provided with a slide surface plate means has a rebated inner edge at each end of said slide surface, thereby to offset inwardly of said frame openings neutral axes of said! rebated members in the vicinity of said slide surfaces to minimize transverse deflection of said slide surfaces and the press frame under load.
  • each said plate means is secured across corresponding subframe member edges of at least two adjoining subframes, and in which end portions of each said plate means have reduced dimensions to minimize the effect on stress concentrations in the press frame due to the attachment of said plate means to the respective subframes.
  • a press frame according to claim 2 in which the thickness of individual subframes and spacing between adjoining subframes is selected to minimize bending moments in the press frame at right angles to said subframes, when the press frame is loaded.
  • a press frame according to claim 4 in which said rebated edges on said members of a subframe provided with slide surface plate means merge at the four corners of the frame opening into the edges of the subframe to which the platens are secured, through smooth notches formed with relatively large radii and designed to minimize maximum operative stresses in the press frame.
  • a press frame according to claim 2 further comprising a press cylinder with at least one ogen end detachably secured at said one open end to one of san platens, and a disc sealably fitted inside said one open end of said cylinder and secured to said one platen.
  • each subframe is prestressed to cause localized yielding in regions of the sub-frame of highest stress concentration.
  • a press frame according to claim 2 wherein the interconnected subframes are prestressed between the platens to an extent which is in excess of normal press frame working load, thereby providing a press frame subject to localized yielding in regions of the highest stress concentration.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Press Drives And Press Lines (AREA)
US747857A 1967-07-26 1968-07-26 Frames for presses Expired - Lifetime US3563167A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB34475/67A GB1240823A (en) 1967-07-26 1967-07-26 Improvements in frames for presses

Publications (1)

Publication Number Publication Date
US3563167A true US3563167A (en) 1971-02-16

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ID=10366105

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US747857A Expired - Lifetime US3563167A (en) 1967-07-26 1968-07-26 Frames for presses

Country Status (6)

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US (1) US3563167A (enrdf_load_stackoverflow)
DE (1) DE1752851A1 (enrdf_load_stackoverflow)
FR (1) FR1573749A (enrdf_load_stackoverflow)
GB (1) GB1240823A (enrdf_load_stackoverflow)
NL (1) NL6810605A (enrdf_load_stackoverflow)
SE (1) SE353031B (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3687066A (en) * 1969-09-16 1972-08-29 Radiator Ets Stands for presses
US3783775A (en) * 1970-09-15 1974-01-08 Radiator Ets Stands for presses
US4389183A (en) * 1979-10-09 1983-06-21 Pont-A-Mousson S.A. External frame injection molding apparatus
US6415640B1 (en) * 1998-10-02 2002-07-09 Daimlerchrysler Ag Tool and method for making a tool
WO2003039846A1 (en) * 2001-11-06 2003-05-15 System S.P.A. A structure for presses, in particular for forming ceramic products
US20110219963A1 (en) * 2008-09-22 2011-09-15 Klaus Schuermann Frame press with guide columns
ITMO20100301A1 (it) * 2010-10-28 2012-04-29 System Spa Struttura per presse in particolare per la formatura di prodotti ceramici.
US20160332326A1 (en) * 2015-05-15 2016-11-17 Usnr, Llc Modular press
CN114799012A (zh) * 2022-04-29 2022-07-29 中国重型机械研究院股份公司 一种预应力管端镦锻机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1196506B (it) * 1986-07-16 1988-11-16 Nassetti Ettore Spa Incastellatura perfezionata per presa,in particolare per lo stampaggio di materiali ceramici

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3687066A (en) * 1969-09-16 1972-08-29 Radiator Ets Stands for presses
US3783775A (en) * 1970-09-15 1974-01-08 Radiator Ets Stands for presses
US4389183A (en) * 1979-10-09 1983-06-21 Pont-A-Mousson S.A. External frame injection molding apparatus
US6415640B1 (en) * 1998-10-02 2002-07-09 Daimlerchrysler Ag Tool and method for making a tool
WO2003039846A1 (en) * 2001-11-06 2003-05-15 System S.P.A. A structure for presses, in particular for forming ceramic products
US20040261489A1 (en) * 2001-11-06 2004-12-30 Franco Stefani Structure for presses, inparticular for forming ceramic products
US7160092B2 (en) 2001-11-06 2007-01-09 System S.P.A. Structure for presses, inparticular for forming ceramic products
US20110219963A1 (en) * 2008-09-22 2011-09-15 Klaus Schuermann Frame press with guide columns
ITMO20100301A1 (it) * 2010-10-28 2012-04-29 System Spa Struttura per presse in particolare per la formatura di prodotti ceramici.
WO2012056347A1 (en) 2010-10-28 2012-05-03 System S.P.A. A structure for presses, in particular for forming ceramic products
CN103124621A (zh) * 2010-10-28 2013-05-29 系统股份公司 用于压机特别是用于形成陶瓷产品的压机的结构
US8857327B2 (en) 2010-10-28 2014-10-14 System S.P.A. Structure for presses, in particular for forming ceramic products
CN103124621B (zh) * 2010-10-28 2015-08-19 系统股份公司 用于压机特别是用于形成陶瓷产品的压机的结构
RU2580864C2 (ru) * 2010-10-28 2016-04-10 Систем С.п.А. Конструкция для прессов, в частности, для формования керамических изделий
US20160332326A1 (en) * 2015-05-15 2016-11-17 Usnr, Llc Modular press
US10011041B2 (en) * 2015-05-15 2018-07-03 Usnr, Llc Modular press
CN114799012A (zh) * 2022-04-29 2022-07-29 中国重型机械研究院股份公司 一种预应力管端镦锻机

Also Published As

Publication number Publication date
DE1752851A1 (de) 1971-04-08
FR1573749A (enrdf_load_stackoverflow) 1969-07-04
SE353031B (enrdf_load_stackoverflow) 1973-01-22
GB1240823A (en) 1971-07-28
NL6810605A (enrdf_load_stackoverflow) 1969-01-28

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