Large-sized multi-nozzle pipe hot extrusion forming process formulation and mold design method

Abstract

The invention discloses a large-sized multi-nozzle pipe hot extrusion forming process formulation and mold design method. Taking a double-nozzle pipe for example, the method comprises the following steps: determining the size of each part of an unmachined double-nozzle pipe after hot extrusion forming; determining the size of an initial pipe blank; determining the position of the center of a prefabricated hole and the size of the aperture; determining amount of compression in the axial direction of the pipe blank with the prefabricated hole, of which oxide skin is removed, required for finishing hot extrusion forming of a second nozzle; determining amount of compression in the axial direction of the pipe blank required for continuing to finish hot extrusion forming of a first nozzle; determining the dimensional parameter of a key part of the hot extrusion mold; selecting the structural form of the hot extrusion mold; determining the extrusion capacity parameter and selecting forming equipment; determining a technological flow of the double-nozzle pipe hot extrusion forming process. According to the method, a pipe inner hole and a nozzle inner hole can be directly formed, the structural strength at the nozzle is improved, the metal mechanic property and the structure property are improved, the manufacturing period is shortened, and the material utilization rate is improved.

Description

technical field [0001] The invention belongs to the field of multi-nozzle pipeline manufacturing, and relates to a large-scale multi-nozzle pipeline hot extrusion forming process formulation and mold design method. Background technique [0002] Large multi-nozzle pipelines are important facility components in nuclear power, thermal power, petrochemical and other industrial fields. [0003] Currently, there are two methods for manufacturing large multi-nozzle pipes. One method is to use the combination of free forging and machining to remove material, that is, firstly, the solid blank is free forged to form a solid blank with a pipe profile with a solid boss, and then the solid blank is machined to obtain the inner hole of the pipe. and nozzle bores. This method has low production efficiency, low material utilization rate, complicated heating process, poor pipeline structure and high energy consumption. Another method is to heat the tube blank multiple times to draw the no...

AI Technical Summary

Problems solved by technology

This method not only increases energy consumption and production cost, but also the performance of the product after forming is unstable and the quality is difficult to guarantee

All of the above methods have certain deficiencies and are not an ideal technology for manufacturing large multi-nozzle pipelines

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