0572205705705722..8...015＝Wφ3.0008−08During the selection of punch material, certain purpose is emphasized, such as production precision, cost of mold and cost of maintenance. In most cases, the materials in Table 1 are applied, and they have already been standardized in this catalog for various shapes of punches. In recent years, with the progress of product precision and diversification, cost reduction is stressed, and the selection of punch material is specified. This has greatly increased the demand of【coating punches】, which can maintain high price performance ratio and wearability. And for this trend, Punch Industry has standardized TiCN coating for the materials in Table 1. However, for customers who never or rarely tried coating punches, it is very difficult to select the ones with high price performance ratio. So, past experience and quantitative measurement is necessary. In order to solve this problem, Punch Industry developed an experiment for coating punches, and figured out the technical data for punch selection according to the comparison of wearability. In the punching experiment, special mold is manufactured, and cold-rolled steel plate（SPCC）is applied as working piece. On the other hand, 3 kinds of general punch materials are selected, combined with・without TiCN coating. So, there are 6 different testing units in total.The punches are assembled to the mold at the same time, and tested in the same condition.For details, refer to the followings.8 punches are applied（drawing 1・picture 1）Key groove punches （Drawing 2）Cold-rolled steel plate SPCC of 0.5 thickness4mmRefer to drawing 37%（single-side 0.035mm）300SPMPunching oil is appliedMAKOTO FucHs lubrication oil MZA65Idemitsu machinery oil 10Mixture ratio 1：2 P.1110FP＝4.000①SKD11②SKH51③SKH40④SKD11-TiCN⑤SKH51-TiCN⑥SKH40-TiCN⑦Standby 1 （no comment）⑧Standby 2 （no comment）Guide for the experimentInstruction of moldShape of punchesMaterials of punches①SKD11②SKH51③SKH40④SKD11＋TiCN coating⑤SKH51＋TiCN coating⑥SKH40＋TiCN coating⑦Spare 1 （unregarded）⑧Spare 2 （unregarded） Guide for TiCN coating Material of button diesSKH40（64〜67HRC）Working pieceShape of punching holesRound φ3mmStrokeDrawing of blanksClearancePunching machineDOBBY30tnf SP30CSFrequencyLubrication1112Experimental shots2 million shotsTable 1 General punch materialsSymbol or specificationGeneral hardnessNameAlloy tool steelsHigh-speed tool steelPowder high-speed tool steelCarbideSuper corpuscle※1：Powder high-speed tool steel （JIS G4403.2000）※2：Carbide Tool Association standard such as V30.SKD11SKH51SKH40※1General※260〜63HRC61〜64HRC64〜67HRC88〜89HRA90〜92HRADrawing 3 Drawing of blanksThe Wearability of TiCN Coating
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