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Introduction to the working principle of the molded size head The size head is a kind of pipe used for the pipe diameter reduction. The forming process usually used is a reduction press, a diameter expansion press, or a reduction and diameter expansion press. For some sizes of heads, press forming can also be used. The size of the head is characterized by a carbon steel having a strength significantly higher than that of the same carbon, which has good toughness and plasticity as well as good weldability and corrosion resistance. The reduction forming process of the large and small heads is to put a tube blank having the same diameter as the large end of the large and small heads into a forming mold, and to move the metal along the cavity and shrink and form by pressing in the axial direction of the tube blank. According to the size of the size reduction head, it is divided into one press forming or multiple press forming. The expanded diameter forming adopts a tube blank smaller than the diameter of the large end of the different diameter tube, and is formed by expanding the diameter along the inner diameter of the tube blank by the inner die. The expansion process mainly solves the problem that the large and small heads are not easily deformed by the diameter reduction, and sometimes the method of expanding and reducing the diameter is combined according to the material and product forming requirements. In the process of reducing or expanding the deformation and deformation, it is determined that cold pressing or hot pressing is adopted according to different materials and the diameter reduction conditions. Cold pressing is used as much as possible, but in the case of severe work hardening caused by multiple reductions, thick wall thickness or alloy steel material, hot pressing is recommended. In addition to the use of steel pipes as raw materials for the production of reducers, the partial diameter of the different diameter pipes can also be produced by the stamping process.
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