Effects of design factors on the driving-out force of the steel shaft in a shrink-fitted ceramic roller

Shrink-fitted ceramic sleeve rollers are recently developed to be used efficiently in steel manufacturing industries. However, at times, the shaft moves out of the ceramic sleeve during cyclic loading because only small a shrink-fitting ratio can be applied. Given that the driving-out forces F d can be calculated as the contact force occuring at the stoppers, this study considers the simplified two-dimensional model with stoppers. Then, the effects of several design factors on the driving-out force are discussed by varying the friction coefficient, shrink-fitting ratio δ/d, shrink-fitted length, and Young’s modulus of the inner shaft. Results show that the driving-out force takes a maximum value of approximately δ/d = 0.3×10 −3 and then sharply decreases to F d = 0 at approximately δ/d = 0.45×10 −3 . The shaft moving out can be prevented by designing a suitable stopper with sufficient strength for maximum value.