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以Ｔｒ２０＊４－７ｈ为例，分析了小直径梯形螺纹环规制造中螺纹型面精加工余量的选取。扼要地论述了影响螺纹型面精加工质量的因素，叙述了余量丝锥、间隙槽丝锥与螺纹型面的关系。
Taking Tr20 * 4-7h as an example, the selection of the finishing allowance of the thread profile in the manufacture of the small-diameter trapezoidal thread ring gauge was analyzed. The factors affecting the finishing quality of the thread profiles are briefly discussed, and the relationship between the remaining tap and the slot taps and the thread profiles is described.