| 摘要 |
PROBLEM TO BE SOLVED: To provide a measuring apparatus of impact strength, which quantitatively estimates the impact strength of a distance block and also reduces working in a dangerous press working line. SOLUTION: A drawing press die 1 has an upper die 2 and an lower die 3, for carrying out a drawing press working to a material to be pressed, and a plurality of distance blocks 5 which are arranged at the part outer than the peripheral part of the material to be pressed of a cushion ring 33 and are made to contact with the upper die so that a necessary clearance is kept constant between the cushion ring and the upper die when the peripheral part of the material to be pressed is pressed to be restrained with the cushion ring 33 arranged at the lower die 3 and the upper die 2, wherein the drawing press die 1 has a piezoelectric sensor unit 6 for measuring the impact strength of the distance block, which is arranged at the upper die in the state faced to the distance block and detects the face pressure of the upper die and the distance block. COPYRIGHT: (C)2009,JPO&INPIT
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