The mold used for stretching is called a stretch mold, which is a tool for mass processing materials (metal or non-metal) into the required stampings. Stretch molds can be categorized into single-stroke deep drawing molds, compound molds, and progressive deep drawing molds based on their assembly. They can also be divided into single-action press stretch molds, double-action press stretch molds, and triple-action press stretch molds according to the stamping equipment used, with the main distinction being the different types of flanging devices (elastic flanging and rigid flanging). Stretch molds can also be classified into initial deep drawing molds and subsequent process deep drawing molds, with the primary difference lying in the structure and positioning methods of the flanging rings.