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螺纹一般采用切削加工的方法进行生产,它的精度主要由牙型误差、牙距误差及中径公差所决定,其中中径公差通常是采用三针及单针测量法进行测量。稍不小心就容易超差,我在教学中根据螺纹牙型都是规则的三角形、梯形,通过解这些三角形、梯形,利用三角形正切关系,计算出各种牙型角的螺纹螺旋槽宽度与中径变化的比例关系。这样,在螺纹车削中,就可以只进行一次测量,根据测量出来的实际尺寸与图纸所给定的尺寸之差,准确地计算出轴向进刀量。
The thread is generally produced by cutting method. The accuracy of the thread is mainly determined by the tooth profile error, the tooth pitch error and the diameter tolerance. The medium diameter tolerance is usually measured by three-pin and single-pin measurement. A little careless easily over tolerance, I teach in the thread are based on the rules of the triangle, trapezoid, by solving these triangles, trapezoids, using the tangent of the triangle to calculate the angle of the helical groove width and angle Diameter changes in the proportion of relations. In this way, in the thread turning, you can only make a measurement, according to the measured actual size and drawing the size of the given difference, accurately calculate the amount of axial feed.