镁合金板热拉深模具设计及应用

Design and application of a hot deep drawing die for Mg alloy sheets

为测定镁合金的极限拉深比,根据圆筒拉深件成形的特点,设计了可实现差温变形的拉深模具。凹模与压边圈采用加热棒进行加热,最高温度可达300℃,以提高板坯的成形性能;凸模中通入冷却水,使完成弯曲变形进入到筒壁传力区的板料快速降温以提高其强度。利用该模具,分别对5083铝合金和AZ31镁合金进行了圆筒极限拉深比的测定试验,验证了该模具系统的可靠性。

In order to determine the forming limit of magnesium alloy, a set of deep draw- ing tools was designed according to the characteristic of deformation of a cylindrical part. The die and the blank holder can be heated up to 300℃ by a heating rod, so as to improve the formability of the sheet. Circulating water can be led into the punch, as a way to cool down the sheet and improve its strength, when the bending deformation is finished and the sheet enters the force transmitting zone of the cylinder wall. Experiments of cylinder forming limit were conducted with 5083 aluminum alloy and AZ31 magnesium alloy. The results show that the die set is reliable.