A temperature control method for differential rolling of thick-walled rings

Abstract

The invention discloses a differential temperature rolling temperature control method for a thick-wall ring part. The differential temperature rolling temperature control method primarily comprises the following steps of (a) dividing meshes of the ring part; (b) giving an initial temperature field of the ring part at a moment n; (c) giving the smallest critical temperature difference value, separately calculating the average temperature of an inner wall layer of the ring part, the average temperature of an outer wall layer of the ring part and the average temperature of a center layer of the ring part, and judging whether the difference between the minimum values of the average temperature of the inner wall layer of the ring part, the average temperature of the outer wall layer of the ringpart and the average temperature of the center layer of the ring part exceeds the minimum critical temperature difference value or not; (d) calculating the cooling heat flux needed by the ring part at the moment n; (e) giving the rolling total time t and judging whether the ring part is cooled or not; and (f) obtaining a cooling heat flux change value in the whole rolling process. According to the invention, a certain temperature difference is kept between a surface layer and the center of the thick-wall ring part all the way, so that the defect at the center is eliminated favorably, the forming uniformity of the ring part is improved, and the comprehensive performance of the ring part is improved.

Description

technical field [0001] The patent relates to the technical field of ring rolling, in particular to a temperature control method for differential rolling of thick-walled rings. Background technique [0002] Ring rolling, also known as ring rolling or hole reaming, is a special plasticity that uses rolls to drive the ring to rotate, and through continuous rolling deformation of the rolling pass, the diameter of the ring is continuously increased, the wall thickness is reduced, and the section is gradually formed. processing. Compared with the traditional die forging, free forging, flame cutting process, due to its technical and economic advantages such as high ring precision, good quality, high production efficiency, energy saving and material saving, and low production cost, it has become the current production of various seamless rings. The common method of forging is widely used in aerospace, shipbuilding, atomic energy industry, construction machinery, mining machinery an...

AI Technical Summary

Problems solved by technology

In this way, due to the low temperature, the deformation resistance of the upper and lower surface layers becomes larger, resulting in difficulty in deformation. At the same time, the temperature of the core is high and it is easy to deform.

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