一次大修一台大型车床时,需要制造一件直径为90毫米,长度为7760毫来的大丝杠(图1)。由于原材料和加工的原因,我们分为三节制造,最后,采用併接的方法,保证了精度,使用情况良好。我们采用一种最常用的接头结构型式(图2),为了保证併接的精度,对定心直径采用选配的方法,保证间隙为0.01～0.015;螺纹和定心轴颈一次车出,螺纹 For a major overhaul of a large lathe, a large screw with a diameter of 90 mm and a length of 7760 millimeters is required (Figure 1). Due to the raw materials and processing reasons, we are divided into three sections of manufacture, and finally, the use of parallel methods to ensure accuracy and good use. We use one of the most commonly used connector structure (Figure 2), in order to ensure the accuracy of parallel and centering diameter using an optional method to ensure that the gap is 0.01 ~ 0.015; thread and centering a car out, thread