A Study on the Strengthening of Cold Punch Mold Using Metal Powder (Mold Steel and High Speed Tool Steel) and DED AM Technology

Abstract

In this paper, the aim of it is to create additive manufacturing fabrication for high-strength punches. In order to deal with the high-strength parts of the vehicle, it was confirmed that a full-additive manufacturing punch could be fabricated by cold punch mold metal powder materials (mold steel or high speed tool steel) using the 3D printing technology. For the manufacturing method, the analysis of the DED (Directed energy deposition) will be performed compare with other method of additive manufacturing method. Based on the previous studies, it can be seen that HWS powder metal material exhibits better mechanical properties in many powder materials such as M4, M300 and so on. Therefore, in this article, we focused on the performance of HWS powder metal material. The comparative specimens were produced by bulk materials of bulk D2 and bulk HWS. In order to obtain the better mechanical properties of the powder material, there is a post process for the additive manufacturing specimens which used the heat treatment after fabrication by additive manufacturing. In the experimental section, it was designed according to experimental principles and test standards. The problems in the experimental process and the evaluation indicators of the experimental results will be presented in this study. From the results of the experiment, the specimens produced by the additive manufacturing fully demonstrate the mechanical properties of the material. A material of HWS has an excellent mechanical property with the comparison of the test results. The results show that HWS has better mechanical properties and the possibility of replacing bulk materials to fabricate punch. In addition to this, various semi-additive manufacturing punch shapes are simulated and analyzed in order to select the partial shape for reinforcement of the piercing punch. After analyzing the simulation results, it was found that the shape of the flat type is the most stable, and it has been found that the shape of the edge having a triangular sectional shape is stable. The semi-additive shape selected by this simulation will be used to intensify punches which fabricated by using metal powder and AM technology. In the future, the more simulation software was used for mechanical analysis of the punch during the stamping process. Laminated combination of multiple materials will be tested in order to achieve more excellent mechanical properties. Moreover, additive manufacturing punch should test the durability and wear resistance. The quality of punching should also be considered as an analysis indicator for the punch.