An installation model and design method for interference-free cylindrical power skiving tools
摘要
Power skiving is a significant gear manufacturing method that offers excellent performance in terms of efficiency and precision. Particularly, cylindrical power skiving tools attract lots of attention and gain powerful competitive since its cylindrical tool shape maintains the cutting edge geometry after rake flank sharpening against traditional conical tools. However, the small clearance between the tooth flank and the slot surface makes them prone to interference. To overcome this drawback, this work developed a concise interference-free design method for cylindrical power skiving tools. Firstly, an eccentricity installation model of power skiving that taking swivel angle of skiving tool as direct variable to control the clearance angle is introduced. The basic forward cutting edge curve design and inverse cutting profile simulation with respect multi-radial infeed are briefly studied by discrete enveloping to satisfy its generality for common gear profile. Further, the interference between cutting teeth flank and the machined slot surface is equivalent to the overcutting of teeth up edge and the negative instantaneous relief angle around cutting edge with respect entire infeed process. At last, a complete design procedure that adopting both enlarging the swivel angle is proposed, where cutting teeth helix angle revising is involved, and its effectiveness is validated by the design results of an internal gear power skiving.