Contact behaviour of elastic abrasive spheres during self-centring type magneto-mechanical deployment for internal bore finishing

摘要

Elastic abrasive finishing, in its various forms, has been demonstrated for micro-finishing of engineering surfaces in the recent past. Conceiving the advantages of elastically controlled abrasion, a deployable type-internal bore finishing tool with self centring magnetic pads to hold elastic abrasive spheres has been introduced in this paper. Contact of such magnetically held elastic abrasives on target surfaces has been simulated, analysed with various contact hypotheses, and supplemented by experimental results. Spring-Dashpot analogy of elastic abrasive contact and characteristics of magnetically controlled abrasive deployment for surface finishing are discussed in detail. Reduced penetration depth of embedded grains due to significant reduction in elastic modulus at contact interface, through the action of elastomeric medium, is illustrated through simulations. With a significantly lower depth of cut under the action of controlled cutting velocity, elastic abrasive spheres are capable of generating fine finish without altering the surface form.