一、问题的提出 超塑挤压成形模具型腔已经成为超塑性技术的一个重要应用方面。它不但可以一次成形出尺寸稳定、形状复杂、轮廓清晰的模具型腔,而且具有工艺简单、制造周期短、成本低的优点。因此,国外已广泛采用这种技术制造塑料模、橡胶模、铸造用石蜡模,甚至锻模和冷挤压 First, the problem put forward Super-plastic extrusion die cavity has become an important application of superplastic technology. The utility model not only can form the mold cavity with stable size, complex shape and clear outline at one time, but also has the advantages of simple process, short manufacturing cycle and low cost. Therefore, foreign countries have widely adopted this technology to manufacture plastic molds, rubber molds, cast paraffin molds, and even forging dies and cold extrusion