US3184939A - Hydraulic straightening press - Google Patents

Hydraulic straightening press Download PDF

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Publication number
US3184939A
US3184939A US151982A US15198261A US3184939A US 3184939 A US3184939 A US 3184939A US 151982 A US151982 A US 151982A US 15198261 A US15198261 A US 15198261A US 3184939 A US3184939 A US 3184939A
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US
United States
Prior art keywords
ram
straightening
press
pivot
movable
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
US151982A
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English (en)
Inventor
Eitel Hans-Georg
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.)
EITEL PRESSES Inc (EPI)
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US3184939A publication Critical patent/US3184939A/en
Assigned to EITEL PRESSES INC. (E.P.I.) reassignment EITEL PRESSES INC. (E.P.I.) ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: EITEL, HANS G.
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
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/18—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram
    • 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
    • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • B21D3/10—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts between rams and anvils or abutments

Definitions

  • This invention relates to a hydraulic straightening press having a stationary control device for the hydraulic drive for the upward and downward movement of the straightening ram, the control member of the said control device being adjustable by means of a manually operated adjusting device to a position determining the depth of the stroke of the straightening ram and being returned by a member connected to the straightening ram to its starting position in which it stops the drive of the ram when the latter has reached the adjusted depth of stroke.
  • Hydraulic straightening presses are used in particular for workpieces, for example shafts or other rod-like parts which have a curvature in the longitudinal direction, caused for example by distortion, for the purpose of reshaping the said workpieces, after they have been clamped in fixed securing devices in the straightening press, by an amount which as accurately as possible eliminates the distortion by means of pressure applied by the straightening ram in the press in the opposite direction to the existing distortion. Since the workpiece is first elastically bent by the pressure of the straightening ram before the reshaping occurs, the depth of bending of the workpiece during the straightening operation must be carefully watched. 1
  • this known straightening press has a special pump which is inserted in the pipes connecting the two working chambers of the hydraulic cylinder of the press and the direction of delivery and the output of which can be regulated "ice by adjusting a control member of the control valve of the pump.
  • the manually operated adjusting device and the actuating member connected to the straightening ram act jointly on an input part of a multi-member control linkage, the output of which is connected to the control member of the control valve.
  • the manually operated adjusting device comprises a handwheel and a toothed drive; the large number of intermediate members in this control with their unavoidable play do not permit accurate adjustment of the control valve.
  • the readjustment consequently also requires the handwheel to be turned through large angles and then a very accurate correcting adjustment.
  • This straightening press control the time required for the necessary correcting adjustments is consequently relatively great, and the accuracy of the adjustment is frequently insufiicient.
  • the present invention aims at so constructing the control of a straightening press that the above mentioned disadvantages of known straightening presses are eliminated.
  • the single figure of the drawing shows more or less diagrammatically a straightening press and control means therefor constructed in accordance with this invention.
  • the straightening press or" this invention may include a ram 16 having a piston 11 thereon slidably received in a cylinder 12.
  • a more or less conventional piston valve 13 is utilized to control operation of the ram 10, and the piston valve 13 may well comprise a cylinder 14 having a piston 15 slidably received therein, and the piston 15 is provided with spaced piston heads 16 and 17.
  • the cylinder 14 is provided with an internal annular recess 18 communicating through a conduit 19 with one end of the cylinder 12, and the cylinder 14 is also provided with a second annular recess 20 spaced from the recess 18 and communicating through a conduit 21 with the opposite end of the cylinder 12.
  • a hydraulic pump 22 driven in any suitable manner.
  • the piston valve 15 is provided with a piston rod 24 projecting out of the cylinder 14-, and pivotally mounted on the. outer end of the piston rod 24 at 25 is a valve actuating control lever 26.
  • One end 27 of the valve actuating lever 26 is disposed in the path of movement of an abutment 28 carried by a rod 29 which is fixed to the ram '10, and is movable therewith.
  • the abutment 28 may be fixed on the rod 29 or may be provided with means for permitting adjustment thereof to various positions on the rod 29.
  • a plunger 36 is pivotally connected at 31 to the valve actuating lever 26 between the pivot point 25 and the end 27, and the plunger 36 is provided with a head 32. thereon slidably received in a cylinder 33, and the cylinder 33 is provided with a cap 34- which engages the head 32 and limits movement thereof in an upward direction as viewed in the drawing, the plunger 39 and head 32 being urged upwardly by a compression spring 35.
  • the end of the valve actuating lever 26 opposite from i the end 27 is pivotally connected at 36 to a rod 37 which is pivotally connected at 38 to a sleeve 39, which is pivotally mounted at 40 on the frame of the press.
  • a shaft 41 on the outer end of which is provided a handle 42, and on the opposite end of the shaft 41 there is fixed an eccentric 43 disposed opposite an abutment 44 mounted on the frame of the press.
  • Work supporting means in the form of centers 45 and 46 may be mounted on the frame of the press below the press ram 19, and the centers 45 and 46 serve to support a shaft or rod 47 to be straightened.
  • a suitable 1neasuring device such as a dial indicator ii may also be provided to indicate the degree of bending of the shaft 47, and also to provide an indication as to when the straightening operation has been completed.
  • the abutment 28 the valve actuating lever 26 when the ram 10 reaches the lowermost point of travel, and the point at which the return movement of the ram it; actually begins will be determined by the location of the pivot point 36 which in effect provides a fulcrum for the actuating lever 26 during movement thereof to move the piston valve 15 to a posi-. tion causing retraction of the ram iii.
  • the position of the pivot point 36 is, of course, determined by the position of the eccentric d? in engagement with the abutment 44.
  • a differential action of the valve actuating lever 26 which is determined by the position of the abutment 28 on the rod 29, and by the position of the eccentric 43 inengagcment with the abutment 4%
  • the abutment 28 will move upwardly out of engagement with the end 27 of the valve actuating lever 25, and at this time the compression spring 35 will move the plunger 39 upwardly, and as a result thereof move the actuating lever 26 in a counterclockwise direction about the pivot 36 to move the piston valve 15 upwardly to neutral1 position, and at this'time the handle 42 and sleeve 39 may be manually moved clockwise about the pivot 4t to disengage the eccentric 43 from the abutment 4-4
  • the measuring device .43 may then be utilized to determine whether the shaft 47 is straight, or whether a further c'raightening operation is required, andin the event such operation is required, the amount of travel of the ram 19 necessary to complete the straightening
  • first means moving with said ram second means movable in a first-direction and a second opposite direction for engagement at a first part thereof by said first means during at least a part of the stroke of the ram to move said second means in said second direction; movable first pivot means located ata second part of said second means for permitting pivotalmove ment in said first and second directions thereto; third means pivotally connected to said second means intermediate of said first and second parts and movable in said first and second directions when said second means pivots about said first pivot; fourth meansincluding stop means for limiting-the movement of said third means in said first direction and means biasing said third means against said stop means; fifth means, the position of which controls said ram,1pivotally connected to said second means intermediate of said second part and said third means, whereby the pivoting of said second meanscontrols the position of said fifthmeans; and sixth means for determining any one of
  • said sixth means includes a first member movable about a first axis for determining said fixed positions of said first pivot means and an adjustable stop means.
  • said adjustable stop means includes an eccentric cooperating with a stationary abutment; and means for mounting said first memher to rotate about a second axis, whereby to rotate said eccentric.
  • said sixth means includes a second member pivotally connected to said first pivot means and to a thirdpivot means associated with saidfirst member.
  • means is a spring.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Forging (AREA)
US151982A 1960-11-16 1961-11-13 Hydraulic straightening press Expired - Lifetime US3184939A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEE20189A DE1169256B (de) 1960-11-16 1960-11-16 Hydraulische Richtpresse

Publications (1)

Publication Number Publication Date
US3184939A true US3184939A (en) 1965-05-25

Family

ID=7070212

Family Applications (1)

Application Number Title Priority Date Filing Date
US151982A Expired - Lifetime US3184939A (en) 1960-11-16 1961-11-13 Hydraulic straightening press

Country Status (4)

Country Link
US (1) US3184939A (de)
CH (1) CH390032A (de)
DE (1) DE1169256B (de)
GB (1) GB932867A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3456466A (en) * 1967-07-20 1969-07-22 Henry Ind Inc Control for machine tools
US4036109A (en) * 1972-05-23 1977-07-19 Compagnie Industrielle Des Telecommunications Cit-Alcatel Device for moving and positioning an element of a machine
US4700439A (en) * 1984-07-17 1987-10-20 Hines Industries, Inc. Driveshaft fabricating apparatus

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2425565A1 (fr) * 1978-05-09 1979-12-07 Renault Dispositif d'arret du piston d'un verin hydraulique
HU194089B (en) * 1985-05-21 1988-01-28 Szolnoki Mezoegazdasagi Gepgya Stroke controlling device for hydraulically operated presses particularly ones carrying out the straightening of workpieces
US4912957A (en) * 1989-04-28 1990-04-03 Dayton Rogers Manufacturing Company Smart straightening press

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1087795A (en) * 1911-10-09 1914-02-17 John F Lewis Press.
US1966378A (en) * 1932-08-13 1934-07-10 Baldwin Southwark Corp Mechanism for operating baling presses
US2325146A (en) * 1942-04-29 1943-07-27 Hydraulic Dev Corp Inc Drawing press
US2398438A (en) * 1943-05-27 1946-04-16 Wheeling Steel Corp Spinning mechanism
US2426411A (en) * 1941-09-08 1947-08-26 Hannifin Corp Pressure control for hydraulic presses
US2479336A (en) * 1947-03-27 1949-08-16 Hpm Dev Corp Blankholder press for forming workpieces
US2484879A (en) * 1944-06-05 1949-10-18 Hpm Dev Corp Hydraulic press equipped with a synchronized stripping plunger

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2053184A (en) * 1931-05-20 1936-09-01 Hydraulie Press Corp Inc Press control mechanism
US2580868A (en) * 1947-06-10 1952-01-01 Colonial Broach Co Directional and pressure control valve for hydraulic straightening presses
DE1796045U (de) * 1958-12-15 1959-09-17 Eumuco Ag Fuer Maschb Schmiedepresse.

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1087795A (en) * 1911-10-09 1914-02-17 John F Lewis Press.
US1966378A (en) * 1932-08-13 1934-07-10 Baldwin Southwark Corp Mechanism for operating baling presses
US2426411A (en) * 1941-09-08 1947-08-26 Hannifin Corp Pressure control for hydraulic presses
US2325146A (en) * 1942-04-29 1943-07-27 Hydraulic Dev Corp Inc Drawing press
US2398438A (en) * 1943-05-27 1946-04-16 Wheeling Steel Corp Spinning mechanism
US2484879A (en) * 1944-06-05 1949-10-18 Hpm Dev Corp Hydraulic press equipped with a synchronized stripping plunger
US2479336A (en) * 1947-03-27 1949-08-16 Hpm Dev Corp Blankholder press for forming workpieces

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3456466A (en) * 1967-07-20 1969-07-22 Henry Ind Inc Control for machine tools
US4036109A (en) * 1972-05-23 1977-07-19 Compagnie Industrielle Des Telecommunications Cit-Alcatel Device for moving and positioning an element of a machine
US4700439A (en) * 1984-07-17 1987-10-20 Hines Industries, Inc. Driveshaft fabricating apparatus

Also Published As

Publication number Publication date
DE1169256B (de) 1964-04-30
GB932867A (en) 1963-07-31
CH390032A (de) 1965-03-31

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