On the snagging operation: Part I: Modeling and simulation of wheel wear characteristics

A complete mathematical model for snag-grinding operation is introduced for both machine dynamics and the wheel wears. Machine dynamics is identified as machining with impact and is treated as a quasi-bilinear problem. The grit breaking phenomena is treated as a stochastic process of breaking brittle materials. The cutting stiffness (K2) is estimated by the method described by Yokouchi [J. Jpn. Soc. Prec. Eng. 47 (7) (1983) 90] and machine parameters were found by experimental methods. The equations of motion are solved by numerical computations, and wheel wear patterns are simulated and compared with the experimental results. Similar results are obtained in the case of auto balancer, but the qualitative results of the fixed balancer were deviated to some extent. Possible explanations for the deviation are discussed. The wheel engaging positions with the work are identified and hence the cause of uniformly distributed wear behavior around the wheel is discovered.