Forming of magnesium alloy cup using friction heated punch

Abstract. In deep drawing of aluminum and magnesium alloys, it is known that many alloys are difficult to form at room temperature. In particular, many commonly used magnesium alloys are very difficult to form at room temperature. To improve formability, warm processing is used. However, the problem is that the mold requires heating and cooling equipment and its control equipment. In the present study, we attempted warm deep drawing using frictional heat generation. To heat the punch itself, a frictional heat generation structure was incorporated inside the punch. The materials of the friction heater jig were several kinds of stainless steel and alloy steel tools. The relationship between the heat generation temperature of the frictionally heated punch and the working time was investigated. In addition, the amount of wear due to friction of each jig was investigated. It was found that sufficient working temperatures were obtained in the friction-heated combination of austenitic stainless steel and alloy tool steel. It was also found that good formability of the deep-drawn cup was obtained in warm deep drawing using the prototype friction heated punch.