In the world of mechanical manufacturing, although copper sleeves are small, they play an important role. However, sometimes their surface may appear uneven, and there are many reasons behind this.

Firstly, the influence of processing technology cannot be ignored. When turning, if the tool is not sharp enough, it is easy to tear and leave fine marks on the surface of the copper sleeve during the cutting process, resulting in unevenness. Or if the cutting parameters are not set properly, such as speed and feed rate, it can greatly reduce the surface smoothness. Furthermore, quality issues with the raw materials themselves may also be the "culprit". If there are too many impurities in the copper material during smelting, the uneven distribution of these impurities after subsequent forming into copper sleeves will cause uneven surfaces, as if "small bumps" hidden inside have emerged. Furthermore, during the transportation and storage of copper sleeves, if they are subjected to external impact or compression, the originally flat surface will also deform, appearing concave or convex, which will damage their original flatness.

In short, if you want the surface of the copper sleeve to be smooth and even, you need to strictly control every aspect to ensure that it plays a good role in machinery.