Method and apparatus for measuring forces on a workpiece during

Details Method and apparatus for measuring forces on a workpiece during Method and apparatus for measuring forces on a workpiece during

1987-05-12

1988-10-25

Bray, W. Donald

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72 20, 72273, B21D 2221

Patent

active

047794429

ABSTRACT:
A method and apparatus for measuring the sidewall tension in a workpiece being drawn through a draw die and/or ironing die. A punch is provided which is adapted to measure and continuously monitor the axial load on the punch nose and the total axial load on the punch, the distribution of such loads around the periphery of the punch, and bending of the punch near the base and nose due to lateral and nonuniform forces acting on the punch as the workpiece is forced through a die or dies. Determination of the forces, their distribution, and punch bending enables accurately determining the tensile stress at any portion of the sidewall.

REFERENCES:
patent: 4589270 (1986-05-01), Lee, Jr. et al.
Mechanical Testing, Section 8, "Miscellaneous Mechanical Tests", pp. 923 and 924.

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