DEVICE AND METHOD FOR DETECTING FINAL DEPTH OF PUNCH IN MACHINE TOOL

摘要

A machine tool for bending a workpiece by clamping the workpiece with a die and a punch is configured to: distinguish a material characteristic of the workpiece as an actual value and a nominal value; determine an actual material characteristic during an machining operation and re-calculate an operation target value suitable for the workpiece; and bend the workpiece by operating the punch in accordance with the suitable operation target value thus re-calculated.

主权项

1. A machine tool configured to bend a workpiece by clamping the workpiece with first and second bending tools, wherein
as preparation, the machine tool
(1) obtains a relationship between stress and strain of each of a plurality of kinds of workpieces by performing a material test thereon,(2) obtains a relationship between strain and machining load at a particular portion of each of the workpieces by calculating a machining model which is based on the workpiece with use of the relationship between the stress and the strain, and(3) further calculates a relational equation of the machining load and stress of the workpiece which are not dependent on a material thereof, and thereafter, the machine tool obtains, as a material constant, a relationship between stress and strain of the workpiece to be bent based on the relational equation of the machining load and the stress and values of the strain and machining load of the workpiece to be bent.