Finite element analysis and structural design of axially uniform-loaded nut

Author:

Chun-jiang Zhao1,Yong-feng Liu2,Fei-tao Zhang1,Zheng-yi Wang1,Hai-lian Gui1

Affiliation:

1. Engineering Research Center for Department of Heavy Machinery Education, Taiyuan University of Science and Technology, Taiyuan, China

2. State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, China

Abstract

Axially heavy-loaded screw pairs are widely used in rolling mill press systems and other heavy equipment. During the working process, the nut is pressed at both ends, which causes equivalent stress at the thread roots in a U-shaped distribution along the height. Thread roots at the ends tend to suffer fracture failure when the equivalent stress is too great. In this article, the finite element software ANSYS is used to establish a 3D model of screw pairs and analyse bearing characteristics. A new structure based on the results of finite element analysis, which improves U-shaped stress distribution, is proposed for the axially uniform-loaded nut, with a different strain–displacement relationship between the nut matrix and the thread teeth. Such a relationship can greatly reduce peak stress at the thread roots of the nut on both ends. Experiments are conducted on the nut using the electrometric method. Results are compared with the finite element results to directly verify the reliability of the finite element model of ordinary screw pairs and indirectly verify the reliability of the structural model of new screw pairs.

Funder

Natural Science Foundation of Shanxi Province

National Natural Science Foundation of China and Shanxi coal based low carbon joint fund

National Natural Science Foundation of China

Publisher

SAGE Publications

Subject

Applied Mathematics,Mechanical Engineering,Mechanics of Materials,Modeling and Simulation

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