GB1487979A - Press-forming apparatus - Google Patents

Press-forming apparatus

Info

Publication number
GB1487979A
GB1487979A GB3749875A GB3749875A GB1487979A GB 1487979 A GB1487979 A GB 1487979A GB 3749875 A GB3749875 A GB 3749875A GB 3749875 A GB3749875 A GB 3749875A GB 1487979 A GB1487979 A GB 1487979A
Authority
GB
United Kingdom
Prior art keywords
cylinders
pistons
frames
main
die
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
Application number
GB3749875A
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.)
Individual
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
Priority to GB3749875A priority Critical patent/GB1487979A/en
Publication of GB1487979A publication Critical patent/GB1487979A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0272—Deflection compensating means

Abstract

1487979 Presses S SHIOKAWA 11 Sept 1975 37498/75 Heading B3E A press comprises a pair of spaced parallel C-shaped support frames 6, a member 9 fixed to the lower parts of the frames 6 and mounting on its upper surface a female die 9, a pair of main hydraulic cylinders 4 mounted on the upper parts of the frames 6, a movable member 2 supported above the fixed member 3 by the pistons 7 of the cylinders and mounting on its lower surface a male die 8, an aperture 10 in member 2 adjacent and extending along its lower surface, a row of further hydraulic cylinders 11 in the aperture, and means to connect hydraulic circuits of the main and further cylinders whereby distortion of the workpiece due to uneven load distribution is reduced. Each further cylinder is connected by its own stop valve 19 and a flexible pipe 17 to the main pressure supply line 13. In the inoperative position shown, the rams 12 of the cylinders are fully retracted. The fully extended position of each ram is adjustable. The total areas of the ram pistons equals that of the two pistons 7. When a workpiece shorter than the dies is to be pressed, or particular precision is required, a calculated pressure may be exerted on the movable frame, and all valves 19 closed, to maintain the corrected shape of die 8. Electromagnetic or mechanical valves which can be operated simultaneously may be used.
GB3749875A 1975-09-11 1975-09-11 Press-forming apparatus Expired GB1487979A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3749875A GB1487979A (en) 1975-09-11 1975-09-11 Press-forming apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3749875A GB1487979A (en) 1975-09-11 1975-09-11 Press-forming apparatus

Publications (1)

Publication Number Publication Date
GB1487979A true GB1487979A (en) 1977-10-05

Family

ID=10396924

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3749875A Expired GB1487979A (en) 1975-09-11 1975-09-11 Press-forming apparatus

Country Status (1)

Country Link
GB (1) GB1487979A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2226515B (en) * 1988-12-29 1993-06-02 Amada Co Ltd Sheet workpiece bending machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2226515B (en) * 1988-12-29 1993-06-02 Amada Co Ltd Sheet workpiece bending machine

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee