The purpose of precision gear forging is to directly produce gears without subsequent cutting. If it can be forged at room temperature, the shape and size of the gear can be easily controlled, and the error caused by high temperature can also be avoided. At present, many bevel gears and small cylindrical gears are manufactured by this method. When the overall size is appropriate, cylindrical spur gears and helical gears can also be manufactured by cold extrusion. However, high temperature will lead to material oxidation and die deformation, which will affect the accuracy and surface quality of forgings. It is difficult to correct these errors by additional cutting, which will also increase the cost.

In recent decades, great progress has been made in precision gear forging. More and more manufacturers and users pay attention to gear forging. It is generally believed that forging method can improve material utilization, improve productivity, improve mechanical properties of gears, reduce costs and enhance market competitiveness. Especially for the large-scale production of automobile industry, precision gear forging has greater benefits and potential. Precision gear forging has many advantages and has been used in the mass production of bevel gears, but there is still a long way to go from the mass production of cylindrical spur gears and helical gears. In particular, before being accepted by the manufacturer, a set of reliable production process must be established.

Especially when the error on the tooth profile is corrected by the subsequent grinding process, in addition to increasing the cost and prolonging the working hours, there is also the problem of gear positioning in the grinding process. At present, the generally accepted process method is the combination of hot forging, warm forging and cold forging.

Hot forging and warm forging can achieve high efficiency and high material utilization, while cold forging can correct the errors of hot forging and warm forging and improve surface quality. At the same time, the cold treatment process can also obtain residual compressive stress on the tooth surface and improve the service life of the gear.

The above is an introduction to the advantages of precision gear forging. Those who need precision gears are welcome to consult IHF Hefa gear manufacturers