容差和工艺余量分别是控制零件制造误差和补偿产品装配累积误差的重要参数。
Tolerance restricts manufacturing error of part, and allowance redeems the error that comes into being in the process of product assembly.
航空产品研制过程中通常用工艺余量来补偿装配累积误差，不合理的余量将导致装配效益低下。
Usually, process allowance is used to compensate assembly error's stack-up in the process of aero-product's development. But improper allowance may affect assembly-benefit.
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