Motors are becoming an environment-friendly alternative around the world. Environment-friendly automobile parts in particular require high quality and productivity. To improve these requirements, we studied a manufacturing technology called mold technology. However, a disadvantage of mold mass-production is a fatigue failure due to wear out, damage, material welding, plasticity deformation, failure, and fatigue after a relatively large amount of friction and pressure on the processed products. Eventually, this leads to problems of repair costs, production stoppages, and quality defects.
To address these problems, a surface-treatment technique is often used to improve mechanical properties by coating the mold surfaces. In this study, we measured the abrasion on Tungsten Carbide punch and TiAlCrN coated punch during the mold mass-production of the cold-rolled steel plate motor core made with SCP-1 (thickness of 1.0 mm).
The result of 4.5 million strokes in the productivity of the important shaft process in the mold mass-production is as follows There was abrasion of 0.049 mm (wear out from Ø8.169mm to Ø8.120mm) for the Tungsten Carbide punch. There was an abrasion of 0.004 mm (wear out from Ø8.169mm to Ø8.165mm) for the TiAlCrN coated punch. As a result, it is shown that abrasion was improved about 91% in the TiAlCrN coated punch in comparison to Tungsten Carbide punch.
Additionally, the result of comparing and measuring the inner diameter of the punched sheets is as follows There was 0.064mm inner diameter reduction (reduction from Ø8.165mm to Ø8.101mm) in No.2 Cavity (Tungsten Carbide). There was 0.064mm inner diameter reduction (reduction from Ø8.165mm to Ø8.101mm) in No.1 Cavity (TiAlCrN Coating). As a result, it is shown that inner diameter reduction was improved about 71% in No.1 Cavity (TiAlCrN Coating) in comparison to No.2 Cavity (Tungsten Carbide).