LOOTREPPULOWERTOOL 2020005031.60±053115＝Wφ10＋0.005 0 φ3R10φ1.0φ3±0.0026.1.G.58.00.3i9.821.1 lacnhceTataDs・tcudorP00 −02The wearability of punch is evaluated according to the height of burr after 30 thousand shots of punching. In order to prevent burr deformation, micrometer with sensor is applied in the test.The burr of products is caused by the wear of punches and button dies. In this experiment, because the wear of button dies is not obvious, it is ignored. In fact, as shown in the pictures （Pictures 3.5.7） of tested tips, punches are worn, but button dies are hardly worn. On the other hand, the height of burr is an evaluation method for product precision. Because less dimension alteration is caused when punching round holes, it is ignored.The comparisons of identical punch materials with・without TiCN coating are listed as follows.（1）Trend for the height of burr（Diagrams1,2,3）（2）Trend for the state of burr（Pictures 2,4,6）（3）The state of tested tips（Pictures 3.5.7）The diagrams and pictures of each material（SKD11, SKH51 and SKH40） P.1114FRONTSIDEC0.31.51.61.61.6The evaluation method of wearabilitySupplementary of the evaluation methodTest resultsDrawing 1 Mold assembly drawingDrawing 2 Special experimental punchesPicture 1 Special experimental moldDrawing 4 Height of burrHeightof burr1113
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