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. In this paper, the machining principle of variable hyperboliccircular-arc-tooth-trace (VH-CATT) cylindrical gears is analysed, and amodular configuration design of this special machine tool is carried out.Based on the importance of parameter and knowledge dependence of rough settheory, the degree of influence of the index hidden in the data on thedecision-making results is mined, and an algorithm for calculating theobjective weight of the index is given. The comprehensive weight of theindex is then obtained, combining the analytic hierarchy process. Afterobtaining the results of the index's comprehensive weight and moduleattribute classification, a module retrieval strategy is formulated usingthe fuzzy similarity priority ratio algorithm. Based on the modular divisionof this special gear-making machine tool, the modular configuration sequenceof the machine tool using the depth-first search algorithm is determined.According to the module retrieval strategy and configuration sequence, atraversal of module instances is carried out, and a variety of modularconfiguration schemes of the machine tool is obtained, which provides apractical and efficient method for the rapid design of a special machine toolfor VH-CATT cylindrical gears.

Modular configuration design of a special machine tool for variable hyperbolic circular-arc-tooth-trace cylindrical gears