Ram position setting method and ram control unit for press brake

Details Ram position setting method and ram control unit for press brake Ram position setting method and ram control unit for press brake

1997-08-27

1998-09-29

Jones, David

Metal deforming

With use of control means energized in response to activator...

Sensing tool or tool-linked part

72 213, 723894, B21D 501

Patent

active

058132635

ABSTRACT:
During the process of bending a workpiece, actual load exerted on the workpiece and displacement are sampled and the bending stress to displacement relationship is obtained from the sampling data and data on the actual thickness of the workpiece. From the bending stress to displacement relationship, a material characteristic value (e.g., yield stress) which indicates the condition of the material of the workpiece is obtained. Then, a bending angle correction amount is obtained from the material characteristic value, using a data table concerning the material characteristic value to bending angle relationship. From the bending angle correction amount thus obtained, a correction depth amount is obtained. The correction depth amount is added to a preset reference depth amount to obtain a final depth amount according to which bending is performed.

REFERENCES:
patent: 4408471 (1983-10-01), Grossard et al.
patent: 4797831 (1989-01-01), Dressing et al.
Japanese Patent Abstract Publication No. 02030327 A, dated Jan. 31, 1990, JUNJI et al.
Japanese Patent Abstract Publication No. 03090218 A, dated Apr. 16, 1991, Haruo.
Japanese patent Abstract Publication No. 03071922 A, dated Mar. 27, 1991, Kinshiro.
Japanese Patent Abstract Publication No. 03071923 A, dated Mar. 27, 1991, Kinshiro.
Japanese Patent Abstract Publication No. 04361831 A, dated Dec. 15, 1992, Naoto.

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