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某工件结构如图所示，工件材料的剪切强度=300MPa，卸料力因数K=0.03，采用冲压工艺，试计算落料力、冲孔力及卸料力。(6分)

 

答案

参考答案：

1.落料力：F落=1.3LTI=1.3лdlt=1.3×3.14×25×1×300=30615N 

2.冲孔力：F冲=1.3L’TI=1.3лd’lt=1.3×3.14×10×1×300=12246N 

3.卸料力：F卸=K卸×F落=0.03×30615=918N

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21（）

A.artifacts

B.use-cases

C.actors

D.workers
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A.胸部CT检查

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C.抗结核治疗

D.抗感染治疗

E.定期随访
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