Technology for forging forge pieces through conical plate upsetting method with additional forced cooling

Abstract

Large steel ingots have their inherent defects, such as segregation, inclusions, loose, coarse columnar crystals, etc. In order to reduce these casting defects, the present invention proposes a conical plate upsetting method with additional forced cooling, which is used to close the gap of forgings. The main technical route is: casting steel ingot → chamfering → blanking → forced cooling + conical plate upsetting Coarse → rolling → smooth. This manufacturing process can increase the internal hydrostatic stress, effectively forge internal defects, and prevent internal cracks.

Description

technical field [0001] The invention belongs to the field of metal plastic processing, and relates to a conical plate upsetting method with additional forced cooling, which can increase internal hydrostatic stress, effectively forge internal defects, and prevent internal cracks. Background technique [0002] Large-scale forgings are one of the typical forgings that are forged on hydraulic presses, and are one of the core components of heavy equipment, including tube sheets and impellers for steam turbine boilers, flat top covers for nuclear reactor pressure vessels, heat exchanger tube sheets, bottom heads for chemical containers, etc. , some of which also have blind holes. The raw materials used are steel ingots. Steel ingots have their inherent defects, such as segregation, inclusions, loose, coarse columnar crystals, etc. In order to reduce these casting defects, on the one hand, the level of smelting must be improved, and on the other hand, the level of forging must be...

AI Technical Summary

Problems solved by technology

The results show that the core of the billet with the central boss compaction process always has three-dimensional compressive stress during the upsetting process, and the core is deformed, but there are still hard-to-deform areas on the upper and lower end surfaces; There is always two-way tensile stress in the center of the billet during the upsetting process. Although the billet in the contact part with the cone and plate is forced to deform and the difficult-to-deform area is eliminated, the core does not produce effective deformation.

Images