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在宣讲和学习《公差与配合》新国家标准时,基本偏差换算规则是个难点。什么是基本偏差换算规则呢?我们知道,基本尺寸小于或等于500毫米时,轴的基本偏差数值是由公式计算得出的,孔的基本偏差,是由轴的基本偏差换算而来的,其换算的规律就叫做基本偏差换算规则。要讲清楚换算规则,首先必须明确新的国家标准对于推荐的各种配合要求遵守两条原则,即:1.尺寸至500毫米段内较高精度配合时,采用孔、轴不同等级配合,使孔低一级,以便孔、轴工艺等价,例如H7/g6、H6/p5等。较低精度配合时,由于孔、轴加工难易相
When preaching and learning new national standards of “tolerances and cooperation,” the basic rules of deviation conversion are a difficult task. What is the basic deviation conversion rule? We know that the basic size is less than or equal to 500 mm, the axis of the basic deviation value is calculated by the formula, the basic deviation of the hole, is derived from the basic deviation of the shaft, which The law of conversion is called the basic deviation conversion rule. To make it clear that the conversion rules, we must first clear the new national standards for the various requirements of the recommendation to comply with the two principles, namely: 1. Size to 500 mm high precision with the paragraph, the hole, the shaft with different levels, so that The hole is lower by one level so that the hole and shaft processes are equivalent, for example H7 / g6, H6 / p5 and so on. Lower accuracy, due to the hole, shaft machining phase