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Size head heat treatment technology

TIME:2018-09-18
In the process of reducing or expanding the diameter of pipe fittings with large and small heads...

Size head heat treatment technology

In the process of reducing or expanding the diameter of pipe fittings with large and small heads, cold or hot pressing is adopted according to different materials and changing the diameter of pipe fittings. Usually, cold pressing is adopted as far as possible, but hot pressing is suitable for the case of severe hardening caused by multiple diameter changes, the case of thick wall or the material of alloy steel. The tube blank with a diameter smaller than the big end of the big head is used for the expanding forming, and the tube blank is formed along the inner diameter of the tube blank by the internal punching die. The expanding process mainly solves the problem that the large size head is difficult to be formed by shrinkage. Sometimes the expanding and shrinkage methods are combined according to the forming needs of materials and products.

Because the size of the head is heated to suppress the three passes, the tonnage of the equipment needed to form the material is reduced. Hot-pressed tees have a wide range of adaptability to materials and are suitable for low carbon steel, alloy steel, stainless steel materials; especially for tees with large diameter and thick pipe wall, this forming process is usually used. In addition to using steel pipe as raw material to produce large and small head, the size of department specifications can also be produced by stamping forming process of steel plate. The exterior of the drawing die is designed according to the inner surface dimension of the big and small head, and the blanked steel plate is stamped and drawn by the stamping die.

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