Device and method for simultaneous forming of double nozzles by uniaxial extrusion

Abstract

The invention provides a single axis extruding device and method for forming double nozzles simultaneously, and belongs to the field of manufacturing of thick-walled pipelines with nozzles. The device comprises an extruder with a lifting oil cylinder and an extruding machine. The extruding machine comprises an upper ejector rod, a lower ejector rod, an extruding barrel and an extruding barrel jacket. The extruding device is mounted on the extruder. The lifting oil cylinder drives the extruding barrel jacket to move in the vertical direction. The extruding barrel is tightly hooped through the extruding barrel jacket and moves along with the extruding barrel jacket. According to the single axis extruding device, metal in blanks flow through extrusion of the upper ejector rod and the lower ejector rod. When extrusion is started, a cavity is filled with the metal, and the blanks and the extruding barrel move together through friction force; and after bulging is completed, the metal on the upper nozzle flows to the upper nozzle, the metal under the lower nozzle flows to the lower nozzle, and the speed of the metal between the upper nozzle and the lower nozzle is zero relative to that of the blanks. The extruding device can direct form pipeline inner holes and nozzle inner holes, the structure strength at the nozzles is improved, the metal mechanical and structural properties are improved, and the material utilization rate is increased.

Description

technical field [0001] The invention relates to the field of manufacturing thick-walled pipes with nozzles, in particular to a device and method for simultaneous forming of uniaxial extrusion and double nozzles. Background technique [0002] Large-scale double-nozzle thick-walled pipelines are widely used in nuclear power, thermal power and other fields. However, due to their large volume and complex shape characteristics, the performance requirements for the connection between the nozzle and the pipeline are high. How to obtain the ideal large-scale double-nozzle pipeline A major problem in the field of pipe manufacturing. So far, there are roughly three methods for manufacturing large-scale double-nozzle pipes: one is through forging, free forging a solid blank to obtain a solid blank with a solid boss pipe profile, and then machining the inner hole of the pipe and Nozzle inner hole. This method has many heating times and cumbersome procedures, which lead to low producti...

AI Technical Summary

Problems solved by technology

This method has low stress corrosion resistance and low strength at the nozzle and pipe connection, resulting in a greatly shortened service life

Although the above three methods can obtain pipes with nozzles, they all have certain shortcomings and are not ideal technologies for manufacturing large double-nozzle pipes.

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