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在机械制造中,检验制件时,首先碰到的问题就是如何正确地选用量具或量仪(以下总称量具)。目前,这个问题并不是所有工厂都是很重视的,特别是一些中小型地方机械厂,量具的选用十分混乱,给生产带来很大损失。例如,公差为0.01毫米的制件,却用卡尺来检查。我们知道,卡尺最高的测量准确度为0.04毫米,这远远地超过了制件公差。这样,当然不能得到准确的测量结果,甚至会把废品当作合格品,或相反。因而,这个问题就成了提高
In the machinery manufacturing, inspection of parts, the first problem encountered is how to properly use measuring tools or measuring instrument (hereinafter referred to as measuring tools). At present, not all factories attach great importance to this issue. In particular, some small and medium scale local machinery factories have quite a lot of confusion in the selection of measuring tools, which has brought huge losses to their production. For example, a part with a tolerance of 0.01 mm is checked with a caliper. We know that the highest caliper measurement accuracy of 0.04 mm, which far exceeds the workpiece tolerances. In this way, of course, accurate measurement results can not be obtained and even waste products can be regarded as qualified products or vice versa. Therefore, the problem has been raised