Technology parameter optimization method of bar rolling of three-roll planetary mill

Abstract

The invention relates to a technology parameter optimization method of bar rolling of a three-roll planetary mill. The technical solution thereof includes: determining a finite-element simulation orthogonal-test scheme, establishing respective finite-element geometric-models, and obtaining corresponding three-directional main stress and equivalent plastic strain data corresponding to all grid elements on any section of a rolling deformation area of a bar part in a simulated rolling process; obtaining maximum DEMAGE values of the rolling deformation area according to a material ductility fracture criterion; and establishing a BP neural network model between the maximum DEMAGE values and deflection angle level values, inclination angle level values, pressing quantity level values and rollingtemperature level values, wherein a deflection angle level value, an inclination angle level value, a pressing quantity level value and a rolling temperature level value at the time when an obtainedmaximum DEMAGE value is minimum are a deflection angle value, an inclination angle value, a pressing quantity value and a rolling temperature value corresponding to bar rolling of the three-roll planetary mill. According to the method, production potential of a unit can be fully exerted, and core part cracking in bar forming can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of a three-roller planetary rolling process parameter optimization method. In particular, it relates to a process parameter optimization method for rolling bars in a three-roll planetary rolling mill. Background technique [0002] Bars play an important role in the development of the national economy and are widely used in machinery, construction, metallurgy, chemical and other industries. The main rolling methods are two-roll continuous rolling, three-roll transverse rolling, step rolling and three-roll planetary rolling. Compared with other rolling methods, the three-roller planetary rolling of bar is characterized in that the bar is subjected to three-dimensional stress during the rolling process, the stress state is good, and the deformation is formed by the continuous accumulation of small deformation. The large reduction is beneficial to improve the rolling quality. However, for some metal materials...

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Problems solved by technology

[0003] At present, there are few studies on the phenomenon of cracks in the bar core during the three-roll planetary rolling process, and the judgment of the three-roll planetary rolling level is mainly based on the strength theory, and the equivalent stress and equivalent strain are used as the judgment of rolling. The level of basis, inherited the ideas in the structural design, in fact, can not meet the needs of processing technology research

Xu Zhiqiang, Huang Yongjian and others introduced the concept of relative density (Xu Zhiqiang, Huang Yongjian, Liu Cai, etc. Research on the influence of large bar rolling on the compression of porosity defects based on relative density [J]. Journal of Beijing Institute of Technology, 2009, 29( 12): 1058-1062.), the porosity defects that appear in the rolling process of large bars are studied in detail, but the concept of relative density is mainly aimed at the appearance of porosity defects in the core of the bar during rolling when the reduction is small. The loose defects in the three-roll planetary rolling mill are different from the crack defects in the core of the bar due to the large reduction in the three-roll planetary rolling process. Therefore, it is difficult to apply to the determination of the process parameters of the three-roller planetary rolling mill.

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