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尺寸公差标准所规定的尺寸和公差,都是以标准温度即20℃(或68℉)为规范的。一旦实际温度偏离20℃时,尺寸就会产生微量变化。这种变化,常常给加工、装配带来一定的影响,导致尺寸合格率和产品质量的下降,特别是大尺寸的温差变化,常常因掌握加工和测量方法不当而使零件报废。本文将讨论如下题问:①在温差状态下由读数尺寸修正得实际尺寸;②在温差状态下尺寸公差带的移位,即尺寸验收界限的变动;③温差对结合间隙的影响。1、设20℃时某尺寸为(?),t℃时变为1_t,根据物理学公式
Dimensional Tolerance The dimensions and tolerances specified by the standards are based on a standard temperature of 20 ° C (or 68 ° F). Once the actual temperature deviation from 20 ℃, the size will have a slight change. This change, often to the processing and assembly have some impact, leading to the size of the pass rate and product quality decline, especially large-size temperature changes, often due to master the processing and measurement methods inappropriate parts scrapped. This article will discuss the following questions: ① in the temperature difference by the reading size to be corrected to the actual size; ② temperature tolerance in the size of the tolerance band displacement, that is, the size of the acceptance limit changes; ③ temperature difference on the binding gap. 1, set a size of 20 ℃ (?), T ℃ becomes 1_t, according to the physical formula