Extrusion device and method for double-nozzle thick-walled pipe extrusion billet

Abstract

The invention provides an extruding device and a method for double-mouth and thick-wall pipe blank extrusion manufacturing, and belongs to the technical field of thick-wall pipe extrusion manufacturing. The device comprises an upper ejector rod, a lower ejector rod, an extrusion cylinder and a floating extrusion cylinder cover; the device is mounted on an extruder; the outer surface of the extrusion cylinder is tightened and fixed by the floating extrusion cylinder cover; the floating extrusion cylinder cover is connected with an extrusion cylinder oil cylinder; the upper end of the upper ejector rod is connected with an extrusion shaft of the extruder through a fixed plate; and the lower end of the lower ejector rod is connected with an extruder lower platform through a fixed plate. In the use process of the device, the upper ejector rod downwards moves for extrusion at a certain speed; meanwhile, the oil cylinder drives the floating extrusion cylinder cover to downwards move at a certain speed to realize synchronous formation of upper and lower pipe mouths. Compared with a traditional forging process, the method has such characteristics as short manufacturing flow, high efficiency, excellent performance and low cost, and can be applied to high-performance forming production of high-performance thick-wall pipes and pipe fittings with pipe mouths for nuclear power and thermal power.

Description

technical field [0001] The invention relates to the technical field of extrusion manufacturing of thick-walled pipes, in particular to an extrusion device and method for extrusion blanking of double-nozzle thick-walled pipes. Background technique [0002] Thick-walled pipes with multiple nozzles are important infrastructure components in nuclear power, thermal power, petrochemical and other industrial fields. At present, there are three methods for manufacturing multi-nozzle thick-walled pipes: the first method is based on the free forging process, that is, firstly, the solid blank is subjected to free forging to obtain a solid blank with a part of the outline of the solid nozzle, and then the solid blank is The inner hole of the pipe and the inner hole of the nozzle are obtained by machining. This method requires repeated heating and forging to shape the nozzle profile, but the cumulative time of multiple heatings is very long, which will lead to coarse grains of the mater...

AI Technical Summary

Problems solved by technology

However, there are problems such as residual stress and welding tissue sensitization in the weld heat-affected zone at the nozzle, which cause stress corrosion damage, resulting in unstable performance and low service life

[0003] Although the above three methods can obtain multi-nozzle thick-walled pipes, they all have certain shortcomings and are not ideal technologies for manufacturing multi-nozzle thick-walled pipes.

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