Finite element simulation method for roll bending-milling process of large-scale stepped thin-walled workpiece

Abstract

The invention discloses a finite element simulation method for a roll bending-milling process of a large-scale stepped thin-walled workpiece. The method comprises the following steps of: establishing a roll bending model of a plate material which is an elastic plastic body, and carrying out grid generation by adoption of shell units so as to simulate a roll bending process of the plate material; simulating a side scraping process through a sub-model technology, segmenting a to-be-milled area of the plate material according to a part structure of the large-scale stepped thin-walled workpiece, and modifying thickness values of shell units in different areas of the plate material so as to simulate a milling process of the large-scale stepped thin-walled workpiece; and simulating a spring-back process. According to the finite element simulation method for the roll bending-milling process of the large-scale stepped thin-walled workpiece, the roll bending-milling process of the large-scale stepped thin-walled workpiece can be accurately controlled, and the spring-back in the machining process can be controlled and even eliminated, so that the defect that the material performance is reduced due to the usually adopted means such as later shape correction, repeated roll bending and the like is avoided.

Description

technical field [0001] The invention relates to the field of mechanical processing and forming simulation, in particular to a finite element simulation method for the rolling-milling process of a large-scale thin-walled part with steps. Background technique [0002] In order to meet the comprehensive requirements of safety, economy, comfort, and environmental protection, in the selection of airframe materials and structures of new commercial aircraft, on the one hand, aluminum alloys, aluminum-lithium alloys and other lightweight materials with low density and high specific strength are selected. On the other hand, a large number of The multi-step thin-walled structure is adopted, such as the skin of the nose, middle and rear fuselage, etc., and the skin panel is partially thinned to form a multi-step thin-walled structure, which can reduce the weight of the skin panel by more than 40%. Among them, the single-curvature stepped thin-walled structure is a typical light-weight ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the springback in the rolling-milling process of large-scale thin-walled parts with steps by means of post-shape correction or multiple roll-bending in the prior art, which will lead to thin-walled parts. In view of the defect that the material properties of the parts are reduced, a finite element simulation method for the rolling-milling process of large-scale thin-walled parts with steps is proposed

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