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Patent Searching and Data


Title:
SHEARING DEVICE
Document Type and Number:
Japanese Patent JPH1128530
Kind Code:
A
Abstract:

To obtain an excellent sheared surface without being influenced by SPM and rigidity of a press at the time of shearing by providing a movable die with an energizing elastic body when shearing, energizing the movable die with the elastic body to positively increase the speed of the movable die when shearing.

The stock 1 is sheared with the die composed of an upper die set 2, a lower die set 3 or the like accompanying the sliding movement and a blank is obtained. A punch 4 is the movable die and the die 9 is equivalent to the fixed die. The punch 4 is bitten into the stock 1 and the elastic body 6 is compressed. Next, the punch 4 is descended, the elastic body 6 is elongated and the shearing of the stock 1 is finished. For example, the stock 1 is 6 mm in thickness, SPHC in material, 50 mm in diameter of the punch 4 and 50 tf in maximum load. The elastic body 6 is 18 mm in diameter, 30 mm in length, two of which are used, and SKH 51 in material. The elastic body 6 is 0.56 mm compressed and deformed at the time of the maximum load, whose longitudinal vibration number f = 42690, and the average speed until the elongation of the elastic body 6 becomes zero is 95626 mm/s.


Inventors:
MATSUNAGA SHUICHI
KONO HAJIME
Application Number:
JP19644197A
Publication Date:
February 02, 1999
Filing Date:
July 07, 1997
Export Citation:
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Assignee:
AIDA ENG LTD
ARITAKA PRESS KOGYO KK
International Classes:
B26F1/40; B21D28/16; B21D28/34; (IPC1-7): B21D28/34; B21D28/16; B26F1/40
Domestic Patent References:
JPS6058653A1985-04-04
JPS60173867A1985-09-07
JPS60107838A1985-06-13