Molding method and molding apparatus for pipe structure having nozzle boss

Abstract

The present invention discloses a molding method and a molding apparatus for a pipe structure having a nozzle boss. The molding method comprises the following steps: S1, constructing a plastic rheology area on a pipe billet, and arranging an outer mold outside the plastic rheology area of the pipe billet, wherein a volume of the material within the plastic rheology area length range is more than or equal to a volume of a nozzle boss requiring molding; and S2, applying axial upsetting-extruding force on the plastic rheology area of the pipe billet from both ends of the pipe billet, such that the material within the plastic rheology area of the pipe billet laterally moves to form the nozzle boss. With the molding method of the embodiments of the present invention, mechanical properties of the nozzle boss structure of the pipe are improved, and characteristics of simple and easily-controllable operation, high material utilization rate, high qualification rate and short manufacturing period are provided during the nozzle boss molding process.

Description

technical field [0001] The invention relates to the field of material forming, in particular to a forming method and a forming device for a pipe structure with a nozzle boss. Background technique [0002] The pipe with the nozzle boss structure is an important facility component in nuclear power, thermal power, petrochemical and other industrial fields. [0003] Currently, there are two methods for manufacturing a pipe with a nozzle boss structure. One method is based on the free forging process and the means of machining to remove material, that is, firstly use a solid blank for free forging to obtain a solid blank with a pipe profile with a solid boss, and then machine the blank to obtain the inner hole of the pipe And the inner hole of the nozzle boss. The method has very low material utilization rate, low production efficiency, high reject rate, and many processing times and complex processes. Someone also proposed a method, based on the drawing and extrusion process,...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that too many times of extrusion on the same nozzle will cause too many times of heating of the nozzle, resulting in over-burning and the structural performance is not easy to guarantee; Tooling costs are high

[0004] At present, various tee forming processes based on plastic forming have certain deficiencies when forming a type of pipe fittings with large pipe length, wall thickness, and nozzle bosses, and cannot be directly applied to pipes with nozzle bosses. In the pipe forming of platform structure

And forming methods based on free forging and machining are not ideal technologies for manufacturing pipes with nozzle boss structures

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