Experimental study of the effect of design parameters of a rolling tool on the quality of the tooth surface

Roughness determines the quality of the surface layer of the working surfaces of the teeth and is an important parameter affecting such operational characteristics of gears as wear resistance, load-bearing capacity, rigidity, heat resistance, etc. In this regard, it is necessary to have the ability to assess the magnitude of roughness at the stage of selecting a forming tool for making teeth. The paper presents the results of an experimental study of the effect of the design parameters of a rolling tool with a hyperboloid generating surface on the roughness of the working surfaces of involute teeth. The experiment was planned using a second-order compositional uniform-rotatable plan. The roughness of the working surface of the teeth produced by knurling was taken as the studied parameter, and the independent parameters were the number, angle of inclination, and pitch diameter of the turns in the smallest section of the hyperboloid knurling tool. An empirical model has been obtained for estimating the obtained roughness value of involute tooth profiles depending on the design parameters of hyperboloid knurling tools. It has been established that, depending on the choice and combination of design parameters of hyperbolic knurling tools, the resulting roughness of tooth profiles is complex and nonlinear. The use of hyperboloid knurling tools allows for the roughness of their involute teeth profile to be achieved in accordance with accuracy class 5..7.
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