Builtin liquid plastic small diameter magnetic rolling tool

LIANG Xing1,2, YAO Xin-gai1,2, LI Ang 1,2

(1.College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2.Precision Machining Key Laboratory of Shanxi Province, Taiyuan 030024, China)

Abstract: Aiming at the problem of variable load and uneven contact stress during the magnetic rolling process, the theoretical analysis of the magnetic rolling mechanism was carried out. According to the incompressibility of liquid plastics, a new set of cutter was developed with the characteristics of uniform pressure transfer. Based on the finite element simulation of the system magnetic circuit, the distribution of magnetic force line and the average radial magnetic force of single magnetic pole of the magnetic rolling tool were determined based on Ansoft, and the rationality of the tool structure was verified by combining with the static field simulation of ANSYS Workbench. Fluent was used to conduct numerical simulation of liquid plastics under the conditions of prestress and load variation, and the analysis showed that the introduction of liquid plastics could make the rolling pressure of each ball evenly distributed in the rolling process. When working conditions changed, the uniform pressure transfer was completed within 0.008 seconds. The processing performance of the new cutter was tested and verified. The results show that the built-in hydraulic plastic magnetic rolling tool reduces Ra in stainless steel pipe from 0.828 to 0.187, and the roughness value and circumferential residual stress distribution tend to be uniform, which is of positive significance to improve the surface quality of long stainless steel tubes.

Key words: liquid plastic; uniform pressure transfer; small diameter; magnetic rolling tool