METALLIC PRESS-FORMED PIECE CRACK DETERMINING METHOD, APPARATUS, PROGRAM AND RECORDING MEDIUM

摘要

In the process of target stamping for fracture judgment, an acquisition unit 101 acquires, as target data for fracture judgment, strain of a target die to be measured over the duration from the start time of stamping measured by strain measuring units 8 to the finishing time of stamping, and also acquires production conditions typically by measurement. An extraction unit 102 extracts the reference data, which gives the minimum total of differences between the production conditions of the reference data extracted from the storage unit 104 and the production conditions of the target data for fracture judgment, as the comparative data. A judging unit 103 compares strain in the comparative data extracted by the extraction unit 102 and strain in the target data for fracture judgment, and judges occurrence of a crack in a stamped product, if the maximum value of the difference is not smaller than a predetermined value. By virtue of this configuration, cracks possibly produced in the process of stamping of various metal materials such as those of iron-base, non-iron-base and stacked products may precisely be judged.