时,修边余量△ H 为: △ H= ( 0.03-0.0 5 ) H =0.04 × 22=0.88mm (2-2) 取 H= 22 mm ( 3 )毛坯计算由《实用冲压技术手册》 p129 公式 4-15 可知 51 . 34 5 57 . 0 66 . 0 31 57 . 0 1 = × + + = + = p r H l mm (2-3) r1= rh 2 = 22 5 2 × × =14.83mm (2-4) 36 . 37 10 57 . 0 66 . 0 31 57 . 0 2 = × + + = + = p r H l mm (2-5) 58 . 25 ) 10 16 . 0 20 ( 10 86 . 0 22 10 2 20 ) ( 86 . 0 2 2 2 2 = × + × ?× × + = + ?+ = p p r r r rH r r (2-6) 65 . 17 5 57 . 0 66 . 0 14 . 14 57 . 0 3 = × + + = + = p r H l mm (2-7) 35 . 20 ) 10 16 . 0 20 ( 10 86 . 0 10 10 2 20 ) ( 86 . 0 2 3 2 2 = × + × ?× × + = + ?+ = p p r r r rH r r (2-8) 所以毛坯长度为 94 . 124 6 . 75 83 . 14 51 . 34 6 . 75 1 1 1 = + + = + + = r l L (2-9) 94 . 139 6 . 90 83 . 14 51 . 34 6 . 90 1 1 2 = + + = + + = r l L (2-10) 54 . 173 6 . 110 58 . 25 37 . 37 6 . 110 2 2 3 = + + = + + = r l L (2-11)
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