The roundness of the reducer should not exceed 1% of the outer diameter of the corresponding end, and the allowable deviation is ±3mm. The material of reducer is implemented in SY/T5037, GB/T9711, GB/T8163, American Standard ASTM A106/A53 GRB, API 5L, APT5CT, ASTM A105, ASTM A234, ASTM A106, DIN German Standard and Customer Requirements
Reducer (size head) is a type of pipe used for pipe reduction. The commonly used forming process is shrinkage-reducing, expanding-diameter pressing or shrinkage-diameter-reducing-diameter pressing. For some sizes of different-diameter tubes, stamping can also be used.
Reducing the diameter of the different diameter tube forming process is to change the diameter of the tube with the diameter of the tube blank into the forming mold, by pressing along the axial direction of the tube blank, so that the metal moves along the mold cavity and shrink shape. According to the size of the reducer, it can be divided into one press forming or multiple press forming.
Diameter expansion is the use of smaller than the diameter of the diameter of the diameter of the pipe blank, with the inner die diameter expansion along the shape of the tube. The expanding process is mainly used to solve the problem of reducing the diameter of the different diameter tube is not easy to reduce the formation of the shape, sometimes depending on the material and product forming needs, the expansion and reduction of the combined use of the method.
During the process of reducing or expanding deformation, according to different materials and changing conditions, it is determined to use cold pressure or hot pressure. Normally, cold pressing is used as much as possible. However, the case of severe work hardening caused by multiple reductions, thicker wall thickness, or alloy steel materials should be hot pressed.