查表选取法综上所述，间隙的选取主要与材料的种类、厚度有关，由于多种冲压件对其断面质量和尺寸精度的要求不同，以及生产条件的差异，在实际生产中很难有一种统一的间隙数值．而应区别情况、分别对待，在保证冲裁件断面质量和尺寸精度的前提下，使模具寿命最高。国内工厂常用的间隙值见表2—2、表2—3、表2—4。表2—2～表2—4给出了汽车、拖拉机、电器仪表和机电行业推荐的几种间隙值。表2-2?冲裁模初始双面间隙材料厚度小于0.5z(z?2???(单位：mm)c)极08、10、09Mn、Q235A、B3zmaxzminzmin小间隙16Mnzmax40,50zminzmax65Mnzmin0.0400.0480.0640.0640.0900.090zmax0.0600.0720.0920.0920.1260.1260.50.60.70.80.91.01.21.51.752.02.12.52.753.03.54.04.55.56.06.58.00.0400.0480.0640.0720.0900.1000.1260.1320.2200.2460.2600.3600.4000.4600.5400.6400.7200.9401.0800.0600.0720.0920.1040.1260.1400.1800.2400.3200.3600.3800.5000.5600.6400.7400.8801.0001.2801.4400.0400.0480.0640.0720.0900.1000.1320.1700.2200.2600.2800.3800.4200.4800.5800.6800.6800.7800.8400.9401.2000.0600.0720.0920.1040.1260.1400.1800.2400.3200.3800.4000.5400.600.6600.7800.9200.9601.1001.2001.3001.6800.0400.0480.0640.0720.0900.1000.1320.1700.2200.2600.2800.3800.4200.4800.5800.6800.7800.9801.1400.0600.0720.0920.1040.1260.1400.1800.2300.3200.3800.4000.5400.6000.6600.7800.9201.0401.3201.500注：1.冲裁皮革、石棉和纸板时，间隙取08钢的25％??2.“c”为单面间隙?????????????表2-3?冲裁模初始双面间隙z(z?2c)紫铜、黄铜、软杜拉铝、中等硬钢（硬钢材料厚度软铝wc0.08～0.2％）wc0.3～0.4％）（wc0.5～0.6％）0.20.30.40.50.60.70.91.01.21.51.82.02.22.52.83.03.54.04.55.06.07.08.09.010.0zmin0.0080.0120.0160.0200.0240.0280.0320.0360.0400.0600.0750.0900.1000.1320.1500.1680.1800.2450.2800.3150.3500.4800.5600.7200.8100.900zmax0.0120.0180.0240.0300.0360.0420.0480.0540.0600.0840.1050.1260.1400.1760.2000.2240.2400.3150.3600.4050.4500.6000.7000.8800.9901.000zmin0.0100.0150.0200.0250.0300.0350.0400.0450.0500.0720.0900.1080.1200.1540.1750.1960.2100.2800.3200.3600.4000.5400.6300.8000.9901.100zmax0.0140.0210.0280.0350.0420.0490.0560.0630.0700.0960.1200.1440.1600.1980.2250.2520.2700.3500.4000.4500.5000.6600.7700.9601.0801.200zmin0.0120.0180.0240.0300.0360.0420.0480.0540.0600.0840.1050.1260.1400.1760.2000.2240.2400.3150.3600.4050.4500.6000.7000.8800.9901.100zmax0.0160.0240.0320.0400.0480.0560.0640.07