Sliding characteristics in hot working tool steel at high pressure

Hot work tool steels are widely used as the metal mold material, such as die casting or hot pressing. In the multi axis press molding and the die casting, the slide mechanism is made to drive a middle child type and a movable type. Sliding of the metal molds under the high temperature and high pressure exists in such a processing method. When thinking about high accuracy and high life of the metal mold, it is important to examine this sliding characteristic. However, there are few examples which investigated the sliding characteristic between the working tools of the same quality of the material. In this study, the frictional property of SKD61 was evaluated with friction machines of the type which slides push. The coating processing was given to SKD61, and frictional properties between SKD61 and SKD61 were able to be evaluated. Smooth MX, coating of Ti and Mo based with highly adhesive, is appropriate in the conditions under high temperature and high pressure. Moreover, the influence that heat exerted was able to be shown at each coating. (C) 2014 Published by Elsevier Ltd.