Cogging forging method

Abstract

The invention provides a cogging forging method. The cogging forging method includes the following steps of 1, forging heating, wherein a proper heating technology is formulated according to the heat conductivity of a material and changes of the specific heat capacity, and it is guaranteed that the center of a forging is completely forged so that the plasticity of the forging can be improved and the deformation resistance of the forging can be reduced; 2, blank cogging forging, wherein the upsetting process and the drawing-out process are specifically carried out so that the overall uniformity of the forging can be improved, and regions which are difficult to deform can be eliminated; 3, forging melting-down heating, wherein when the temperature of the forging is lower than 800 DEG C, forging is stopped, and the melting-down heating process is carried out; 4, molding, wherein a steel ingot is forged to be in a target forging shape; 5, post-forging heat treatment of the forging. According to the cogging forging method, the regions which are difficult to deform in the cogging process are eliminated, and the strain uniformity of the center of the forging is improved; due to a combined cogging tool, the upsetting process and the drawing-out process are rapidly switched, the heating number required during cogging forging is decreased, the forging cost is reduced, and the production efficiency is improved.

Description

[0001] Field [0002] The invention relates to a forging technology, which belongs to the technical field of forging blanking of large forgings. Background technique [0003] The large cake forgings used in nuclear power and thermal power heavy equipment are generally large in size, difficult to form and high in production cost. For example, it is used for main parts such as nuclear reactor central tube supporting end plate, evaporator tube plate and large head. They have been in the harsh environment of high temperature, high pressure and high radiation for a long time, and bear the impact of alternating loads brought by high-flow medium, causing fatigue damage and affecting the safety factor of the overall generator set. Therefore, the harsh working environment puts forward extremely high requirements on the comprehensive mechanical properties of large cake forgings. In the iron and steel smelting process, defects such as shrinkage porosity, shrinkage cavity, and inclusion...

AI Technical Summary

Problems solved by technology

In the process of billet opening, it is necessary to repeatedly pier and pull, and in this process, it is necessary to replace the flat anvil repeatedly, and the process is relatively cumbersome.

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