Abstract
When considered in two-dimensional space, a cylindrical peg being withdrawn from a clearance-fit hole can exhibit one of four contact states: no contact, one-point contact, two-point contact and line contact. Jamming and wedging can occur during the two-point contact. Effective control of the two-point contact region can significantly reduce resistance in peg–hole disassembly. In this paper, we explore generic peg–hole disassembly processes with compliance and identify the effects of key parameters including the degree of compliance, the location of the compliance centre and initial position errors. A quasi-static analysis of peg–hole disassembly has been performed to obtain the boundary conditions of the two-point contact region. The effects of key variables on the two-point contact region have been simulated. Finally, peg–hole disassemblies with different locations of compliance centre achieved using active compliance have been experimentally investigated. The proposed theoretical model can be implemented to predict the range and position of the two-point contact region from the perspective of peg–hole disassembly.
Highlights
Remanufacturing is the process of returning a used product to at least the original equipment manufacturer’s performance specification from the customer’s perspective and giving the resultant product a warranty that is at least equal to that of a newly manufactured equivalent [1]
Taking into account geometrical constraints, the principal peg–hole disassembly processes are summarized
It can be seen that the contact states were significantly different when the compliance centre was located at different positions, both in theory and in practice
Summary
Remanufacturing is the process of returning a used product to at least the original equipment manufacturer’s performance specification from the customer’s perspective and giving the resultant product a warranty that is at least equal to that of a newly manufactured equivalent [1]. A critical step in remanufacturing is the disassembly of the returned product, which is normally manually executed and can be labour intensive due to its complexity [4]. The removal of a cylindrical peg from a clearance-fit cylindrical hole is common in disassembly [7]. 2 The operation can represent many industrial tasks [8], such as pulling a shaft out of a journal bearing. There have been many studies related to peg–hole assembly [9], little fundamental investigation has been conducted for disassembly. Position errors can increase the contact forces between peg and hole, and even cause them to be damaged. Two basic position errors are defined in peg–hole assembly: axial misalignment and angular misalignment [10]
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