US3587288A - Presses - Google Patents

Presses Download PDF

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Publication number
US3587288A
US3587288A US824033A US3587288DA US3587288A US 3587288 A US3587288 A US 3587288A US 824033 A US824033 A US 824033A US 3587288D A US3587288D A US 3587288DA US 3587288 A US3587288 A US 3587288A
Authority
US
United States
Prior art keywords
ram
press
link
frame
pivotally connected
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
US824033A
Other languages
English (en)
Inventor
John C Sharman
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.)
G K ENGINEERING Ltd
Gk Engineering Ltd
Original Assignee
G K ENGINEERING Ltd
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 G K ENGINEERING Ltd filed Critical G K ENGINEERING Ltd
Priority claimed from DE19691926249 external-priority patent/DE1926249C/de
Application granted granted Critical
Publication of US3587288A publication Critical patent/US3587288A/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
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/26—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks

Definitions

  • PATENTED JUNQS l9'il SHEET 1 [IF 2 ATENTED JUN28
  • the invention relates to presses in which the ram of the press operates either in a vertical or substantially vertical plane or, as in the case of an upsetting press, in a horizontal or substantially horizontal plane.
  • the ram is pivotally connected to its driving member such as a connecting rod from a crank shaft and is guided by guide surfaces formed on or carried by the ram which engage cooperating guide surfaces or pillars on or carried by the frame of the press.
  • its driving member such as a connecting rod from a crank shaft
  • guide surfaces formed on or carried by the ram engage cooperating guide surfaces or pillars on or carried by the frame of the press.
  • the ram can cock or tilt during its working stroke with the result that inaccuracies can occur in the operation performed on a workpiece.
  • inaccuracies since they arise from known limitations in press operation, do not necessarily result in workpieces which are rejects but necessitate workpieces being designed so that inaccuracies or tolerances can be removed by a subsequent machining operation with a consequent wastage of material. Whilst the amount of materialwhich has to be removed to correct the inaccuracies of a press is of course small in any one workpiece, the total amount which has to be removed can be substantial when, as is generally the case, large quantities of workpieces are being produced.
  • the ram is normally supported by guide pillars which are themselves supported on the bed of the press and the provision of these guide pillars limits the size of the tools that can be accommodated in the press.
  • the ram In the case of an upsetting press where the ram is operating in a horizontal plane, the ram is firmly supported by pillars or like surfaces disposed below the ram but the problem of misalignment can still arise particularly when the upsetting ram is operating under high loads such that the ram may lift off its lower supporting surfaces.
  • the present invention provides a press having a bed, a pair of frame members, a ram mounted for movement between said frame members towards and away from said bed and the means mounting the ram including first and second primary members coupled to the ram for pivotal movement relative thereto about axes of rotation spaced apart along the axis of movement of the ram and a pair of secondary links pivotally connected to each of said primary members, one link of each pair of secondary links being pivotally connected to one of said frame members and the other link of each pair of secondary links being pivotally connected to the other of said frame members.
  • FIG. 1 is a front elevation of a press and FIG. 2 is a side elevation thereof.
  • the ram body 11 has pivotally secured thereto adjacent the upper and lower ends thereof and along the center axis thereof-a pair of primary links 18 which are of substantially elliptical form in elevation and which, when the ram is in its at rest" or top-dead center position, are disposed so that the major axis is coincident with the center axis of the ram.
  • Pivotally connected to the upper end of the primary link 18 adjacent the upper end of the ram is'one 19 of a pair of secondary links, the other 20 of which is pivotally connected to the lower end of the primary link.
  • the one secondary link 19, being the upper, is pivotally connected at its other end to the one upstanding arm 12 of the frame of the press whilst the other secondary link 20 of the pair is pivotally connected at its other end to the other upstanding arm 13 of the frame.
  • the lower primary link 18 is pivotally connected to its associated secondary links 24 and 25 in a similar way. Additionally the links 24 and 25 are provided with extensions 26 and 27 which are pivotally connected to the pistons 28 of pneumatic counter balance cylinders 29 which are themselves pivotally mounted as at 30 to their respective arms of the frame of the press.
  • linkage system is duplicated on both sides of the press so that the press is thus constrained against rocking movement in a fore and aft direction.
  • the secondary link 25 associated with the lower primary link 18 is connected by a suitable link assembly 32 to a top knockout pin 33 which may conveniently be provided with a removable tip.
  • the ram is constrained to follow a virtually true straight line during reciprocal movement thereof so that errors arising as a result of misalignment between the ram tool and the workpiece are substantially, if not wholly, eliminated.
  • the ratio of the distance between the centers of the two pivotal connections of each of the secondary links to the distance between the center of the pivotal connection between a primary link and the ram body and the center of a pivotal connection between said primary link and a secondary link must be determined geometrically so that, at the "at rest” or dead center positions and at a position equidistant between the "at rest” positions, axis 23 will lie on the central axis of movement of the ram body 11.
  • the pivotal connections between the links and their associated members are supported by a coned thrust bearing which is capable of automatic continuous adjustment to compensate for radial wear.
  • the frame construction for the press can be extremely simple and because there are no mating guide surfaces between the ram body and the frame no expensive machined surfaces have to be provided. Furthermore, since no guide pillars or the like are required the full area of the ram body and the die face can be used for carrying tools so that the tool area for a given size of press is greater than has heretofore been available. For example, with a 600 ton capacity press capable of operating at 35 strokes per minute and having an 8-inch stroke the overall height of the press would be approximately 21 feet and one could provide a tool-carrying slide for the ram, some 23 inches wide and a 34 inch wide bolster for the die.
  • the ram is driven through a connecting rod 34 from a crank shaft 35 which is itself driven through conventional gear train 36 from an electric motor 37.
  • the motor 37 and the other drive elements for the ram 10 are carried on a subframe 38 pivotally connected as at 39 to the main frame 14 of the press, this subframe 38 being biased into its normal operative position by a hydraulic or like ram which is associated with an adjustment screw whereby the biasing load can be adjusted to a preselected figure.
  • a pressure switch which is adjustable to the overload pressure and which, upon the overload release mechanism becoming operative, trips out the main motor contacts and the normal pushbutton controls for the press.
  • the press may be provided with an indexable die unit.
  • a press which includes a bed, a pair of frame members, a ram mounted for movement between said frame members towards and away from said bed,
  • the improvement wherein the means mounting the ram includes:
  • first and second primary members coupled to the ram for pivotal movement relative thereto about axes of rotation spaced apart along the axis of movement of the ram
  • a press according to claim 2 in which, when the ram is in its top-dead center position said axes of pivotal connection lie in a plane passing through the central axis of movement of the ram.
  • each primary member is a link pivotally mounted about its center on the ram.
  • each of the primary members is of elliptical form.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
US824033A 1965-08-21 1969-05-13 Presses Expired - Lifetime US3587288A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB35967/65A GB1162812A (en) 1965-08-21 1965-08-21 Improvements in or relating to Presses
US82403369A 1969-05-13 1969-05-13
DE19691926249 DE1926249C (de) 1969-05-22 Presse
FR6916854A FR2044937A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1965-08-21 1969-05-23

Publications (1)

Publication Number Publication Date
US3587288A true US3587288A (en) 1971-06-28

Family

ID=27430902

Family Applications (1)

Application Number Title Priority Date Filing Date
US824033A Expired - Lifetime US3587288A (en) 1965-08-21 1969-05-13 Presses

Country Status (4)

Country Link
US (1) US3587288A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BE (1) BE741408A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2044937A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1162812A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4590784A (en) * 1984-07-27 1986-05-27 Nippon Kokan Kabushiki Kaisha Press brake
US4614104A (en) * 1984-08-27 1986-09-30 Ball Corporation Apparatus for supporting a body for reciprocal movement
RU2345892C2 (ru) * 2007-03-07 2009-02-10 ГОУ ВПО "Южно-Российский государственный университет экономики и сервиса" (ЮРГУЭС) Штамповочный пресс

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2188578B (en) * 1983-11-09 1988-06-29 Amada Co Ltd Machine tool
GB2188577B (en) * 1983-11-09 1988-06-29 Amada Co Ltd Shearing machine
GB2188579B (en) * 1983-11-09 1988-06-29 Amada Co Ltd Machine tool
KR920008588B1 (ko) * 1983-11-09 1992-10-02 가부시끼가이샤 아마다 전단기(剪斷機)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4590784A (en) * 1984-07-27 1986-05-27 Nippon Kokan Kabushiki Kaisha Press brake
US4614104A (en) * 1984-08-27 1986-09-30 Ball Corporation Apparatus for supporting a body for reciprocal movement
RU2345892C2 (ru) * 2007-03-07 2009-02-10 ГОУ ВПО "Южно-Российский государственный университет экономики и сервиса" (ЮРГУЭС) Штамповочный пресс

Also Published As

Publication number Publication date
DE1926249A1 (de) 1970-12-03
DE1926249B2 (de) 1973-01-18
FR2044937A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1971-02-26
BE741408A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1970-04-16
GB1162812A (en) 1969-08-27

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