Research status of gear hobbing abroad

According to the research results, the existing problem is to simplify the gear hobbing process in three-dimensional space to two-dimensional plane, so that there is a certain error between the obtained model and the actual situation; The three-dimensional simulation model is not accurate enough. To sum up, a digital simulation method of cylindrical gear hobbing process is proposed, which provides a new way to improve gear machining accuracy. ​

Vedmar Lars takes the cutting edge of the tool as the boundary, obtains the geometry of the gear through the analytical method, and determines the roughness of the tooth profile by comparing the obtained gear surface with the ideal gear surface. Friderikos o et al. Used finite element analysis to simulate the complex flow mechanism of chips between the cutting edge of hob and the tooth surface of working gear, and explained the reason of tooth edge collapse of hob. Ruei hung Hsu et al. Studied the gear tooth surface topology, meshing ellipse and transmission error of transmission gear pair produced by traditional hob and improved variable tooth thickness hob. Sun s et al. Modeled the relationship between gear hobbing process and gear geometric error, proposed a model to predict the geometric deviation of gear hobbing teeth, and optimized the gear hobbing process parameters. Karpuschewski B et al summarized the geometric effects of tool profile on wear mechanism, tested various tool profiles and gear geometry, simulated these effects through finite element, and finally matched the wear phenomenon with load parameters.

Klocke f et al. Studied the simulation of non ideal gear hobbing process, and calculated the geometry and morphology of the workpiece. Sabkhi n et al. Proposed a gear hobbing model considering cutting force. The model simulates the undeformed cutting produced by gear hobbing with CAD, and analyzes the influence of cutting force parameters on machining. In order to solve the problems of high cutting temperature and short tool life of dry gear hobbing, Karube s puts forward a new gear hobbing method “vibration hobbing”. In gear machining, the vibration hob generates axial micro vibration to the hob through the external vibration generator, which can effectively reduce the cutting heat in dry environment. The system model of vibration hob is established, the structure of vibration gear hobbing machine is expounded, and the cutting conditions suitable for vibration hob are determined. Pidhaietskyi m et al. Established a hobbing model based on the interaction between the cutting edge of the tool and the tooth profile of the machining surface. By changing the interaction between the cutting edge of the tool and the machining surface, the stability of the cutting process with specific interaction changes is determined.

Sato y et al. Simulated Gear Hobbing with flying cutter cutting on milling machine, studied the influence of water-soluble cutting fluid on tool life, and obtained the lubrication effect and cooling effect of synthetic lubricating additives, mineral oil and additives containing sulfuric acid in water-soluble cutting fluid. D. R. Sant’Anna et al. Analyzed the vibration characteristics of gears during gear hobbing and concluded that resonance should be avoided during gear hobbing. Dimitriou V et al. Proposed a gear hobbing method based on three-dimensional computer-aided design. Through the combination of the relative rotation and displacement of the hob and the workpiece, the force volume is analyzed and the chips are generated at the same time, so as to obtain the three-dimensional geometric entity of the gear.

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