Regular Article

Contact analysis for dual peg-in-hole assembly of automobile alternator frame

¹ School of Mechanical Engineering, Zhejiang University, Hangzhou 310012, PR China
² Ningbo Institude of Technology, Zhejiang University, Ningbo 315100, PR China
³ Ningbo Donghao Casting Co., Ltd., Ningbo 315113, PR China

^* e-mail: liulijunemail@163.com

Received: 17 April 2019
Accepted: 30 January 2020

Abstract

The modeling and analysis of the assembly contact problems in the picking and placement of the automobile alternator frame are carried out in the multi-station processing. According to the three-dimensional assembly characteristics of the actual alternator frame and the fixture, the assembly model in the drilling and milling station is simplified. The alternator frame and fixture assembly problem as a whole is simplified to a dual peg-in-hole assembly problem. All possible one-point contact states and two-point contact states during the assembly process are proposed(L-1)∼(R-10). The contact force analysis is carried out on the typical one-contact state L-1 and the typical two-point contact state L-5, and the relationship between the corresponding assembly forces F_x, F_y, F_z and the assembly moments M_x, M_y, M_z is obtained. According to the relationship between these assembly forces and assembly moments, the corresponding jamming diagrams are obtained. Finally, according to the three-dimensional size of the actual alternator frame, the experimental verification was carried out by using a 6-DOF force/moment sensor. The experimental results confirmed the validity of the analysis. Technical support is provided for the assembly of automobile alternator frames based on force sensing control for the follow-up work.