There are many kinds of molding techniques for spiral blades. One is continuous cold rolling forming technology, which is characterized by high spiral forming efficiency, high material utilization rate in mass production, convenient and quick welding assembly when used by users, and good overall strength. However, due to the limitation of rolling equipment rolling capacity and raw material strip thickness preparation capacity, there are some limitations on the outer diameter, thickness and specifications of the spiral blade. At present, the forming thickness can only be no more than 6MM, and the plate width, that is, the radius difference does not exceed 165MM. Spiral blades of ordinary low carbon steel materials.
Not only that, this molding process has a large consumption of one-time consumption during initial commissioning of production, low material utilization, low production efficiency and high cost in small batch production. The thickness of the outer edge is about 1/2 of the thickness of the edge of the inner hole. However, after hardening by rolling and cooling, the hardness of the outer edge is more than doubled, which compensates for the wear resistance of the outer edge.
Another forming technology of the spiral blade is the segmental equal-thickness forming technology, which is to solve the problem that the continuous rolling forming technology is difficult to control in large diameter, large thickness, special specification size, wear-resistant material, stainless steel material, etc. And the development of proprietary technology. After forming, the outer diameter, inner diameter and pitch can reach the customer's required size.
Various forms of "carbon steel, wear-resistant steel and stainless steel, equal diameter, equal pitch, variable diameter, variable pitch, inner and outer diameters with bosses or gaps can be specified in the specification sheet. Segmental thick spiral blade". Compared with continuous rolling technology, the molding precision is good, the qualified rate of finished products is high, and it can meet the requirements of small batch and individual supply. It is especially suitable for the production of spiral blades with large specifications, large thickness and wear-resistant steel and stainless steel materials, but large quantities. In production, material utilization and production efficiency are lower than continuous cold rolling forming techniques.
There is also a continuous equal thickness forming technology, which is mainly developed to meet the limitations of continuous rolling technology in the formation of some specifications, low molding accuracy and low yield. The spiral blade produced by continuous equal thickness technology is a continuous multi-pitch shape like the spiral blade produced by the continuous rolling technology. It is characterized by high forming precision and the thickness of the outer edge is consistent with the thickness of the inner hole.
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