| Hypoid gear is a particular spiral bevel gear. It is used to convey transmission ofspace crossed axes. The axis of the driving gear has an offset distance with the axis ofthe driven gear. It has the distinctive advantages of high contact ratio, good meshingperformance, high bearing capacity, high transmission efficiency, smooth transmission,small noise and tight structure.Nowadays at home and abroad the tooth form of hypoid gear is mainly machinedby the method of cutting. It is low production efficiency, high manufacturing cost, lowmaterial utilization rate, especially destroys the continuity of the metal fiber thatcauses low dedendum bend fatigue strength and gear surface contact fatigue strength,thus reduces the service life of gear. Compared with the conventional machiningmethod of cutting, precision forging has the outstanding advantages of continuousmetal fiber streamlines, compact structure, few microstructure defects, which canincrease impact strength, bend fatigue strength, abrasion resistance ability, corrosionresistance ability, thus lengthen gear service life. It not only increases productionefficiency and material utilization rate, but also decreases manufacturing cost.By analyzing the precision forging technology characteristics of hypoid drivinggear, the article choosed gear material, forging temperature, die material and preheattemperature, lubricant, forging method and equipment, and designed forging drawingof hypoid driving gear. Through analyzing forging drawing and principle, the variousblank shape and corresponding forming schemes were designed.Finite element models of all the designed forming schemes were created andsimulated by Deform-3D software. Based on comparative analysis of differentschemes simulation results which include finally forming effect, filling situation oftooth cavity corner, distribution of stress and strain, forming load, the optimizedscheme was confirmed. Especially the two main technology parameters affectingforming process were simulated many times to explore the influence law of main technology parameters. At last the forging effect of gear was controlled by controllingtechnology parameters rationally. The numerical simulation results of the optimizedscheme were analyzed in detail. The forging characteristics and law of hypoid drivinggear was got. |
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