| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique where, in a die for press working for forming a plurality of products (parts) from workpieces by single press working (blanking), deflection produced at a punch backup plate is effectively reduced at a low cost, thus the quality of the products (parts) and the improvement of the service life of the die for press working are achieved. SOLUTION: The punch backup plate 5 is provided with notch parts 5a, 5a other than the regions of "stress overlapped regions Q1, Q2, ...", also, which are arranged at the point symmetry positions of the centers of the figures G1, G1 of the above "stress overlapped regions Q1, Q2 (Q2, Q3)" with the centers of the figures G1, G1 of pressure receiving faces 7a, 7a from punches 7, 7 in the mutually overlapped "stress distribution regions Q1, Q2 (Q2, Q3) as the centers, and further formed into a length equal to the longitudinal direction of the "stress overlapped regions Q1, Q2 (Q2, Q3)". COPYRIGHT: (C)2011,JPO&INPIT
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