Research of the surface roughness of teeth during forming with hyperboloid knurling tools

The use of knurling tools in the formation of involute teeth is a high-performance technology for the production of gears, which makes it possible to ensure strengthening of the working surface of the tooth in combination with their final finishing. The use of hyperboloid knurling tools as a forming tool makes it possible to reduce the main disadvantages of traditional tooth knurling technologies. The paper presents experimental results of a research of the effect of design and technological parameters of the process of knurling gears with a hyperboloid knurl on the nature of the change and the value of the roughness of the working surfaces of the teeth. The process of rolling the samples under research was carried out on a gear hobbing machine model 5D32. To measure the roughness, a Talysurf 5 System profilometer was used. The roughness of the working surface of the teeth produced by knurling was taken as the parameter under research; the independent parameters were the pitch diameter of the knurls, the knurling force, and the initial roughness. It has been established that, depending on the operational purpose of the gears, by varying the knurling force it is possible to ensure a change in the roughness of the working surface of the teeth in a wide range from 0.025 to 0.8 microns. The use of knurling knurls of various diameters for forming teeth makes it possible to change the roughness value by 1.19...6.0 times. Processing of experimental results made it possible to obtain an empirical relationship describing the relationship between the roughness value and the design and technological parameters of the process of forming teeth with a hyperboloid knurl.
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