US3805584A - Press with a pre-stressed press stand - Google Patents

Press with a pre-stressed press stand Download PDF

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Publication number
US3805584A
US3805584A US00315873A US31587372A US3805584A US 3805584 A US3805584 A US 3805584A US 00315873 A US00315873 A US 00315873A US 31587372 A US31587372 A US 31587372A US 3805584 A US3805584 A US 3805584A
Authority
US
United States
Prior art keywords
press
yokes
operating space
spacers
compression plate
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
US00315873A
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English (en)
Inventor
S Nilsson
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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
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 ASEA AB filed Critical ASEA AB
Application granted granted Critical
Publication of US3805584A publication Critical patent/US3805584A/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
    • B30B15/042—Prestressed frames

Definitions

  • ABSTRACT A press for containing forming blocks and pressure cells betweenwhich a sheet metal member is subjected to forming pressure includes upper and lower yokemembers and spacers held together by a prestressed sheath with compression plates arranged next to the yokes to form the operating space between them.
  • the ends of the faces of the compression plates facing the yokes are bevelled so that the pressure exerted on the portions of the yokes adjacent the ends of the compression plates is reduced or completely eliminated.
  • the yokes and the spacers are formed as a rule with substantially radially directed abutment surfaces. In addition to this, they are provided with generally vertical guide surfaces nearest the corners of the operating space, said guide surfaces positioning the yokes and spacers exactly in relation in each other.
  • the part of the yokes and, to a certain extent, of the spacers situated nearest the corners of the operating space is most critical from the strength point of view. The stresses are unfavourable expecially atthe transition between the radial contact surfaces of the yokes and the vertical guide surfaces. At each working cycle the pressure force causes a stress variation with great stress amplitude which gradually gives rise to fatigue failure.
  • FIG. 1 shows a section through a press.
  • FIG. 2 shows the corner part of the operating space of FIG. 1 on a larger scale.
  • 1 and 2 designate an upper and a lower yoke and 3 are spacers which keep the yokes at a fixed distance from each other and which together with these spaces form a substantially rectangular operating space 4.
  • the yokes and the spacers are made with substantially radially directed abutment surfaces 5 and 6 and with vertical guide surfaces 7 and 8 to position the yokes and the spacers exactly in relation to each other.
  • the yokes 1 and 2 and the spacers 3 are kept together by a sheath l0 of prestressed strip material. This sheath 10 also absorbs the pressure forces.
  • the whole press stand rests on a base 11.
  • an upper compression plate 12 and a lower compression plate 13 which transmit pressure forces from units, not shown.
  • forming blocks are used which rest on the lower com pression plate 13.
  • This plate with tools and workpieces may be capable of being pushed into the operating space, or tools and workpieces may be supported by a unit which can be pushed into the operating space and which-rests on the plate 13 during the pressing.
  • a pressure cell attached in the compression plate 12 may be used, said pressure cell having a diaphragm or a bag-shaped container and a thick disc of elastic material transmitting the pressure force to the workpiece and pressing it against the forming block in such a way that it adopts the shape of the block.
  • The.pressure force will be substantially evenly distributed against the compression plates 12 and 13.
  • the specific pressure force P will be evenly distributed, as shown in FIG. 3.
  • the compression plates 12 and 13 are formed with a bevel 14 at their sides facing the spacers 3, and in the example shown said bevel successively diminishes evenly from the side.
  • Press comprising a tubular press stand with a substantially circular cross-section, said press stand containing upper and lower yoke members and two spacers which together form the sides of an operating space space, whereby the surfaces of the yoke members are at least less loaded nearest the sides of the operating space then elsewhere, the size of the bevel decreasing successively away from the side of the compression plate.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
US00315873A 1972-01-03 1972-12-18 Press with a pre-stressed press stand Expired - Lifetime US3805584A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE00004/72A SE359257B (enrdf_load_stackoverflow) 1972-01-03 1972-01-03

Publications (1)

Publication Number Publication Date
US3805584A true US3805584A (en) 1974-04-23

Family

ID=20255923

Family Applications (1)

Application Number Title Priority Date Filing Date
US00315873A Expired - Lifetime US3805584A (en) 1972-01-03 1972-12-18 Press with a pre-stressed press stand

Country Status (5)

Country Link
US (1) US3805584A (enrdf_load_stackoverflow)
DE (1) DE2262551A1 (enrdf_load_stackoverflow)
GB (1) GB1405853A (enrdf_load_stackoverflow)
SE (1) SE359257B (enrdf_load_stackoverflow)
SU (1) SU465774A3 (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992837A (en) * 1974-07-29 1976-11-23 Allmanna Svenska Elektriska Aktiebolaget Press stand
US4250735A (en) * 1978-05-30 1981-02-17 Hawkhead Bray & Son Limited Press action machines
US5593711A (en) * 1995-06-07 1997-01-14 Husky Injection Molding Systems Ltd. Uniformly compressible platen
US20040208950A1 (en) * 2003-04-17 2004-10-21 Husky Injection Molding Systems Ltd Platen
US20160332326A1 (en) * 2015-05-15 2016-11-17 Usnr, Llc Modular press

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3814826A1 (de) * 1988-05-02 1989-11-16 Fleissner Maschf Ag Presskasten zum verpressen von guetern jeglicher art

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2905032A (en) * 1956-05-18 1959-09-22 Samuel J Fuchs Die forging presses
US3064558A (en) * 1955-03-18 1962-11-20 Asea Ab Press stand
GB949813A (en) * 1961-06-14 1964-02-19 Asea Ab Improvements in pre-stressed press frames
US3527076A (en) * 1967-04-14 1970-09-08 Asea Ab Press stand
US3687066A (en) * 1969-09-16 1972-08-29 Radiator Ets Stands for presses
US3717024A (en) * 1969-05-30 1973-02-20 Fluid Power Ltd Link-shaped structure for a press frame

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3064558A (en) * 1955-03-18 1962-11-20 Asea Ab Press stand
US2905032A (en) * 1956-05-18 1959-09-22 Samuel J Fuchs Die forging presses
GB949813A (en) * 1961-06-14 1964-02-19 Asea Ab Improvements in pre-stressed press frames
US3527076A (en) * 1967-04-14 1970-09-08 Asea Ab Press stand
US3717024A (en) * 1969-05-30 1973-02-20 Fluid Power Ltd Link-shaped structure for a press frame
US3687066A (en) * 1969-09-16 1972-08-29 Radiator Ets Stands for presses

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992837A (en) * 1974-07-29 1976-11-23 Allmanna Svenska Elektriska Aktiebolaget Press stand
US4250735A (en) * 1978-05-30 1981-02-17 Hawkhead Bray & Son Limited Press action machines
US5593711A (en) * 1995-06-07 1997-01-14 Husky Injection Molding Systems Ltd. Uniformly compressible platen
US20040208950A1 (en) * 2003-04-17 2004-10-21 Husky Injection Molding Systems Ltd Platen
US7080978B2 (en) 2003-04-17 2006-07-25 Husky Injection Molding Systems Ltd. Platen
US20160332326A1 (en) * 2015-05-15 2016-11-17 Usnr, Llc Modular press
US10011041B2 (en) * 2015-05-15 2018-07-03 Usnr, Llc Modular press

Also Published As

Publication number Publication date
GB1405853A (en) 1975-09-10
SE359257B (enrdf_load_stackoverflow) 1973-08-27
DE2262551A1 (de) 1973-07-19
SU465774A3 (ru) 1975-03-30

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