In the process of long-term use of the wire drawing die, the die wall is subject to strong friction and scouring of the metal wire, which will inevitably produce abrasion. The most common one is the annular groove (dent) at the wire entrance in the working area. The appearance of the ring groove of the drawing die has aggravated the wear of the die hole, because the small particles of the core material that peeled off due to the loosening of the ring groove are brought into the working area and the sizing area of the die hole by the metal wire, acting as an abrasive, and entering The wire of the die hole increases the wear of the die hole like a grinding pin. If it is not replaced in time for repair, the ring groove will continue to accelerate and expand, making repair more difficult, and there may even be cracks in the deeper part of the ring groove, causing the mold to be completely broken and scrapped.

It is learned from experience that it is very economical to formulate a set of norms and standards, strengthen daily maintenance, and frequently overhaul molds. Once the mold has any slight abrasion, polishing in time will take a short time to restore the mold to the original polished state, and the hole size of the mold will not change significantly.