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我们在加工内螺纹时,通常用螺纹塞规来检查螺纹的尺寸和精度。由于使用频繁,特别在批量生产中,塞规很容易磨损,精度降低,很难再保证质量要求。而且用螺纹塞规检查内螺纹又是一种综合检查法,它不能得到螺纹大小的具体数值。这样在加工内螺纹时,对于塞规通不过的不合格零件,究竟还有多少加工余量,就很难知道(尤其是小于 M18毫米的内螺纹)。为此,我们在内径量表的结构基础上,改制成了一种
When we are machining internal threads, we usually check the thread size and accuracy with a screw-on gauge. Due to frequent use, especially in mass production, plug gauge is easy to wear, reduce the accuracy, it is difficult to ensure the quality requirements. And the use of thread plug gauge to check the internal thread is a comprehensive inspection method, it can not get the specific value of the thread size. So in the processing of internal thread, the plug gauge pass unqualified parts, how much machining allowance, it is difficult to know (especially less than M18 mm internal thread). For this reason, on the basis of the structure of the internal diameter scale, we have restructured into a kind