Title:
【発明の名称】順送りプレス加工のピッチ補正方法
Document Type and Number:
Japanese Patent JP2503428
Kind Code:
B2
Abstract:
PURPOSE:To correct the shrinkage pitch in succeeding press stages to maintain the progressive feed pitch conforming to the set pitch by imparting elongation of a prescribed length along the feed direction to feed bridges prior to press working after blanking of hourglasses. CONSTITUTION:A stock 1 of a steel sheet is bored with the glassy hourglasses 6, 6... of a prescribed size at the prescribed pitch and is formed with the feed bridges 4 of the prescribed width at both edges. The stock 1 is progressively fed in series. The stock 1 is fixed to a lower die 7 by a pad 8 from an upper die 7 in a preliminary bending stage of the stage before the press working 5 for drawing. The substantial elongation by bending is imparted to the feed bridges 4 without changing the apparent feed pitch at all by a punch 9 worked from the upper die to the bridges 4 so that the margin for shrinkage in the ensuing drawing is preliminarily corrected. The fixing of the lower die 7 and the pad 8 to the stock 1 is released. The progressively fed stock 1 is given deep drawing successively and the products are taken out.
Inventors:
TAGUCHI TOSHUKI
Application Number:
JP18536086A
Publication Date:
June 05, 1996
Filing Date:
August 08, 1986
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD
International Classes:
B30B13/00; B21D22/20; (IPC1-7): B30B13/00; B21D22/20
Domestic Patent References:
| JPS5364138A | ||||
| JPS5082443A |
Attorney, Agent or Firm:
Tomita Koharu