Helicoid spiral form of entity (S method) and the spiral belt (D method) two.
螺旋面的形式有实体螺旋（S制法）和带式螺旋（D制法）两种。
According the laevorotatory helicoid structure characteristic of the stainless steel spiral plate, analyzed the forming process, and introduced forming die structure.
针对不锈钢螺旋板的左旋螺旋面结构特点，分析了成形工艺，并介绍了成形模具结构。
According the laevorotatory helicoid structure characteristic of the stainless steel spiral plate, analyzed the forming process, and introduced forming die structure.
针对不锈钢螺旋板的左旋螺旋面结构特点，分析了成形工艺，并介绍了成形模具结构。
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