The Influence of the Performance Parameters of Bimetal Composite Pipe on the Forming Efficiency

Abstract

In order to solve the problem of low efficiency in the mechanical drawing process of bimetal composite pipe, a dynamic model of the forming process of bimetal composite pipe is established based on the principle of virtual work and the elastic-plastic deformation criterion. The influence of the material properties of the inner pipe and the outer pipe on the forming success rate is studied. The residual stress of the inner pipe and the outer pipe after forming is taken as the main evaluation object, and the elastic modulus and yield of the material are systematically analyzed The influence of strength on residual stress. The results show that the ratio of the elastic modulus of the inner tube to that of the outer tube is more than 0.6 times of the yield strength when the bimetal composite tube is formed, and the materials with large elastic modulus and small yield strength of the inner tube and small elastic modulus and large yield strength of the outer tube should be selected as far as possible. At last, the theory of material parameter proportion for the successful forming of inner tube and outer tube is put forward. The research conclusion is reasonable and universal, which provides a scientific basis for the selection of composite tube materials, and has engineering practical significance for improving the forming efficiency of bimetal composite tube.

Keywords:

• Bimetal composite pipe
• plastic forming
• modulus of elasticity
• yield strength

Additional information

Funding

This work reported in this paper was supported by the Sichuan Science and Technology Program, Sichuan Youth Scientific and Technological Innovation Research Team of Agricultural Machinery Equipment(2017TD0023); Project of Sichuan Provincial Department of Education, Robot and Intelligent Equipment Research and Innovation Team of Sichuan Universities (15TD0016).