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在螺纹的3个直径(大、中、小径)参数中,中径的实际尺寸对螺纹结合时的互换性、旋合性和足够的连接强度影响是主要的,它决定了螺纹结合时的配合性质,是检验精密螺纹是否合格的一个重要指标。用三针法测量较精密螺纹单一中径是最常用的方法,但是用三针测量螺纹中径尺寸时,三针不容易固定,易造成测量数据不准确。为能方便、快捷、准确地用三针测量螺纹中径尺寸,经过多次研究,笔者设计出了一个可代替人手支撑三针来完成对螺纹中径尺寸测量的夹具。
In the three diameters (large, medium and small diameter) parameters of the thread, the actual size of the middle diameter is important for the interchangeability, the screwing property and the sufficient connection strength when the thread is being joined, and it determines the influence With the nature of the test is to determine whether the precision thread is an important indicator of eligibility. The three-pin method to measure the single screw diameter of the more precise thread is the most commonly used method, but when measuring the middle diameter of the screw thread with three pins, the three pins can not be easily fixed and can easily lead to inaccurate measurement data. In order to conveniently, quickly and accurately measure the diameter of the thread with three needles, after many studies, the author designed a fixture that can replace the manual support of three needles to finish the measurement of the diameter of the thread.