A symmetric spiral arc with variable diameter path generation method for achieving uniform surface roughening processing

Abstract

Uniform surface roughening processing can increase the surface area and thus improve the mechanical interlocking strength. This paper presents a method for generating a symmetric spiral arc with variable diameter path to achieve uniform surface roughening. By constructing a material removal model for the surface roughening process, the contact area radius and maximum removal depth are determined under specific process parameters. A path generation algorithm is designed on a plane to generate paths while ensuring that the maximum removal depth does not breakthrough and damage the surface layer and guaranteeing uniform coverage of the contact area. The planar paths are scaled before projection to achieve equidistant projections of adjacent paths on the spherical surface. The modified paths are then projected onto the surface of the spherical workpiece using inverse spherical pole projection. Moreover, a comparative experiment is conducted between the traditional path and the proposed path to validate the effectiveness and the uniform coverage achieved. The changes in surface roughness before and after processing are evaluated by comparing the treated surfaces with the untreated surfaces. The experimental results indicate that using the symmetric spiral arc with variable diameter path for surface roughening yields better uniform coverage. The increase in surface roughness before and after processing confirms the ability of the proposed path to achieve surface roughening.