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cbatdecbatcbat③The Perpendicularity of shearing surface①general6〜 9％t6〜 9％t8〜12％t7〜11％t7〜11％t6〜10％t6〜10％t6〜10％t6〜10％t6〜10％t6〜10％t6〜10％t5〜 8％t6〜 8％t6〜10％t6〜 9％t5〜 8％t1）If there is no special requirement for the shearing surface, values in ① is recommended.2）For mold for mass production, select the clearance between ②1/2 and ③1/3.3）When the shearing surface has to plumb with the work piece, values of ③1/3 is necessary.4）For precision punching and finish machining, restricting the clearance as less as possible.5）Small clearance for plastic （resin） cutting is necessary. a…Sagging　b…Shearing surface（smooth part） c…Ruptured surface　d…Secondary shearing surface　e…Burr　t…Work piece thicknessClearance is too largePunchButton die1120For pressing and punching processing, selecting the proper clearance of punches and dies is necessary.The thickness of shearing surface is between 1/2 and 1/3 of the thickness of work piece. The proper clearance is 5%〜10% of the work piece thickness and has to be set larger for the material with higher hardness. For punching with punch and button die, if the material become to final product, the dimension of button die is the required dimension. For blanking, the dimension of punch is the required dimension.ClearanceThe clearance selection standard for different material （Work piece thickness t≦3mm）MaterialThe relationship between the different clearances and shearing surfacePiecing and blankingIronSoft steelHard steelSilicon steel Stainless steel Copper （Hard）Copper （Soft） Brass （Hard） Brass （Soft） Phosphor bronzeNickel SilverAluminum （Hard） Aluminum （Soft） Aluminum alloy （Hard） Aluminum alloy （Soft） Lead PermalloyClearance is too smallClearance（Single-side）②For mass production3 〜4.5％t3 〜4.5％t3 〜6 ％t3.5〜6 ％t3.5〜6 ％t3 〜5 ％t3 〜5 ％t3 〜5 ％t3 〜5 ％t3 〜5 ％t3 〜5 ％t3 〜5 ％t2.5〜4 ％t3 〜5 ％t3 〜5 ％t3 〜4.5％t2.5〜4 ％tClearance is appropriatePunchButton die2 〜3 ％t2 〜3 ％t2.6〜4 ％t2.3〜3.6％t2.3〜3.6％t2 〜3.3％t2 〜3.3％t2 〜3.3％t2 〜3.3％t2 〜3.3％t2 〜3.3％t2 〜3.3％t1.6〜2.6％t2 〜3.3％t2 〜3.3％t2 〜3 ％t1.6〜2.6％tPunchHow to Select the Clearance for Pressing・Punching