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HB247-72锥螺纹零件的外螺纹牙根高必须进行检查。检查的方法有两种:一种是直接测量法,一般是将零件置于工具显微镜下进行测量;另一种是利用部标准锥度螺纹环规(HB1921～1931-75)中的牙根高螺纹环规进行检查。前一种方法大都用于简单的小型小批零件的测量,而对于大批量的尤其是某些复杂的大型零件,测量其上的外锥螺纹就不适宜用工具显微镜而必须借助于环规进行检查了。但是,由于牙根高螺纹环规的制造工艺十分困难(尤
The external root height of the HB247-72 taper parts must be checked. There are two ways to check: one is the direct measurement method, usually the parts are placed under the microscope under the microscope; the other is the use of the Ministry of the standard taper thread ring gauge (HB1921 ~ 1931-75) root high thread ring Regulations for inspection. The former method is mostly used for the measurement of small, small parts and small parts, and for large quantities, especially for some complex large parts, the external taper thread is not suitable for use with a tool microscope and must be performed by means of a ring gauge Checked However, the manufacturing process of the root high thread gauge is very difficult (especially