Method for Determining Stable Forming Criterion of Two-way Rolling for Super-Large Ring Parts with Four Rollers

Abstract

A method for determining a criterion of bi-directional rolling stable forming of a four-guide roller super-large ring piece includes the following steps: determining bending moment on either cross section of ring blank by establishing a bi-directional rolling primary simplified mechanical full model of the four-guide roller super-large ring piece; determining maximum stress on the ring blank; andestablishing the criterion for the bi-directional rolling stable forming of the four-guide roller super-large ring piece. According to the method, an important theoretical basis is provided for optimization design of a bi-directional rolling process of super-large ring pieces and development of super-large ring rolling equipment. In actual production, whether a bi-directional rolling process of the four-guide roller super-large ring piece is in a stable state can be known by monitoring equipment parameters and an instantaneous size of the ring blank in real time, a problem of instability of the ring rolling process can be avoided, and the rolling success rate of the super-large ring piece can be improved, a production cycle is shortened, and the method has the advantages of convenience, accuracy and high efficiency.

Description

technical field [0001] The invention relates to the field of rolling and forming processing of rings, and relates to a method for determining a criterion for stable forming of two-way rolling of super-large rings with four rollers. Background technique [0002] High-performance super-large rings are widely used in aerospace, nuclear power, wind power and other fields, especially aluminum alloy super-large rings are used as the basic components of aerospace heavy-duty launch vehicle fuel storage tanks, and are widely used in my country's space station construction, moon landing projects and Mars exploration projects. There are major strategic needs. However, during the two-way rolling forming process of super-large ring parts, it is often difficult to coordinate the radial deformation and axial deformation of the ring blank, and the ring blank is oversized and overweight, and its inertia is huge, which makes the forming process prone to instability. Moreover, as the rolling p...

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Problems solved by technology

[0003] In order to overcome the two-way rolling process of the four-roller super-large ring in the prior art, the ring blank is coupled by more rolls than the traditional two-roller ring rolling, and the movement of multiple rolls is more difficult to coordinate and control. In view of the fact that the stability judgment of the forming process is extremely difficult, the present invention proposes a method for determining the stable forming criterion of the two-way rolling of super-large rings with four rollers

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