The design basis of the steel bar connection sleeve has a high dimensional tolerance level, IT4 level, and the surface roughness is 0.8. These technical conditions are to ensure the matching accuracy of the straight thread connection sleeve and the bearing and the smooth movement.

The steel bar straight thread sleeve is a key part, and its quality directly affects the work efficiency of other workpieces, so the precision of the steel bar straight thread sleeve is high, especially in terms of dimensional accuracy, shape, and position accuracy, and surface roughness.

The structural features of the reinforced straight thread sleeve are as follows:

Install bearings in the φ68mm and φ62mm holes at both ends of the steel sleeve. The inner hole of the bearing and the spindle journal are used to support the spindle and ensure the rotation accuracy of the spindle; it is required that the spindle does not shake when it rotates to ensure the rotation accuracy of the spindle. Therefore, the φ68mm and φ62mm holes and the outer circle of φ85mm are the main processing surfaces of the reinforced straight thread sleeve.

In addition, the total length of the steel bar sleeve is 275mm, the shape and position tolerance of the inner holes at both ends are not easy to grasp, and the thin part of the steel bar straight thread sleeve is only 7mm, the unreasonable process arrangement will cause deformation, which will directly affect the steel bar connecting sleeve The machining accuracy of the barrel, the roughness of the main surface of the steel straight thread sleeve are 0.8 and 1.6, all the machined surfaces need to be ground, and a reasonable heat treatment must be arranged before grinding.

The above is the importance and requirements of the steel bar connection sleeve introduced to you. In short, the main processing surface of the steel bar straight thread sleeve must be processed in multiple ways in order to gradually improve the accuracy to meet the requirements.