Vitrenko O. Increase of teeth knurling strengthening precision due to development of principally new knurling instrument geometry

Object of investigation: Processes of knurling instrument surface formation according to a new shape formation scheme. The aim of the work is increase of strengthening knurling precision of cylindrical gear-wheels teeth due to development of principally new design of knurling instrument. Methods of investigation. Performed investigations are based on methods of the theory of cutting-instruments design, theory of material cutting, theory of shape formation and mathematical simulation, finding of required instrumental surface. Experimental checking of theoretical investigations has been performed according to standard methods of developed surfaces workability estimation . Validity of scientific statements, conclusions and recommendations is grounded by comparative laboratory testing and metrological measurements produced using modern control-and-measuring technique. Scientific novelty of obtained results is as follows: 1. Principally new scheme of instrument formation for knurling teeth of cylindrical gear-wheels has been developed for the first time. 2. Theoretically grounded and experimentally supported the developed multi-pass hyperbola instrument is able to machine gear-wheels of different geometry. Practical importance of obtained results are as follows: 1. Knurling instrument which can machine gear-wheels of different geometry has been produced. 2. Workability limits of knurling instrument are defined even at the stage of it design. Results of the investigation have been introduced at "Transmach" Ltd, Lugansk and Holding Company "Luganskteplovoz" Ltd. The area - machine-building enterprises of Ukraine.