One: Casting blanks. When casting the copper sleeve, each process must be carefully prepared. For example, in sand casting, when closing the box, the core should be straightened, so as to avoid the cast product caused by the incorrect core. If it is eccentric and cannot be processed according to the size, if centrifugal casting is used, the steel film is preheated in advance.

Two: Sand cleaning, this process is mainly for sand casting products. Before processing, first clean the castings, then get on the car, calibrate first, and then get off and cool when the semi-finished product is processed, because copper has shrinkage, in order to process the size to meet the standard, Wait for the workpiece to be placed at room temperature and reload it for processing.
Three: After the finished product, in order to prevent deformation, the sleeves cannot be placed flat and should be placed vertically. After the finished copper sleeve is placed for 24 hours, measure again whether the size is in error (for better installation).
Four: Clean the packaging. The copper sleeve should be fully cleaned in the later stage. When packing, the copper sleeve and the packaging box should be separated by 10mm thick foam to avoid accidental collision during the transportation of non-ferrous metals in Dashan, Henan. The copper sleeve is deformed.