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在机床维修和非标准设备制造中,经常要单件配制各种各样的零件,但在配制这些零件时,往往发现:虽按原厂提供的图纸上国家标准公差(以下简称国标公差)生产的零件,但组装后,有时却达不到原设计所要求的配合性能。这是什么原因呢?是图纸设计得不准确吗?是配合类别、精度等级选择得不适当吗?都不是的。那么,为什么设计合理,加工合格,却出现装配
In machine maintenance and non-standard equipment manufacturing, often a single preparation of a variety of parts, but in the preparation of these parts, often found: Although the drawings provided by the original national standard tolerances (hereinafter referred to as GB tolerances) production Of the parts, but after assembly, but sometimes can not meet the requirements of the original design with the performance. What is the reason? Is the design of the drawing inaccurate? Is it inappropriate to select the type and level of accuracy? So, why design is reasonable, processing qualified, but there is assembly