Straight gear precise forging technology based on flow control forming principle and die

Abstract

Disclosed are straight gear precise forging technology based on a flow control forming principle and a die. The straight gear precise forging technology includes the following steps: step1, the adopted annular blank with a core shaft is precisely forged and formed in a closed mode in a close type precise forging die, the blank is urged to flow to a tooth-shaped concave die cavity, and filling of an upper corner tooth shape is boosted by upward friction force on the blanket of a motionless tooth-shaped concave die at the same time; step2, the core shaft is pressed down by an upper pressing block, precise forging and forming for the second time are carried out after a central diverging area is formed, and the tooth-shaped concave die is pressed down by the upper pressing block at the same time. Filling of a lower corner tooth shape is boosted by downward friction force on the blanket of the tooth-shaped concave die. Through controlling the flow of the blanket in the die cavity, the blanket is enabled to have the space for free flowing in the whole forming process, and a forged piece with tooth shapes completely filled can be precisely forged under the condition that loading is low. The straight gear precise forging technology based on the flow control forming principle and the die have the advantages of being high in material utilization rate, high in product precision and few in follow-up machining.

Description

technical field [0001] The invention relates to the technical field of small modulus spur gear precision forging, in particular to a spur gear precision forging process and die based on the principle of flow control forming. Background technique [0002] Precision forging of spur gears with small modulus has significant advantages such as material saving, energy saving, low processing cost, and high efficiency, and can greatly improve the internal and surface quality of the product. Difficult, requires a large forming force, causing excessive pressure on the cavity wall of the concave mold, resulting in easy cracking of the concave mold, based on this, Japan's K.Osakada et al. proposed to use the shunt principle to reduce the forming load; Dean T.A. proposed the principle of floating dies for precision forging spur gears with hollow forging billets; Forming methods such as bar upsetting, face-adjusting upsetting and composite upsetting with hub parts; Liu Hua from Zhengzhou...

AI Technical Summary

Problems solved by technology

[0002] Precision forging of spur gears with small modulus has significant advantages such as material saving, energy saving, low processing cost, and high efficiency, and can greatly improve the internal and surface quality of the product. Difficult, requires a large forming force, causing excessive pressure on the cavity wall of the concave mold, resulting in easy cracking of the concave mold, based on this, Japan's K.Osakada et al. proposed to use the shunt principle to reduce the forming load; Dean T.A. proposed the principle of floating dies for precision forging spur gears with hollow forging billets; Forming methods such as bar upsetting, face-adjusting upsetting and composite upsetting with hub parts; Liu Hua of Zhengzhou Institute of Machinery and others used hydraulic devices to realize bidirectional pier extrusion of blanks with floating dies to obtain the required workpieces

These gear precision forging forming processes and devices using the shunt principle and floating die, or after forming, need to be machined to remove excess material, which cannot achieve the purpose of precision forging, or the mold device is complicated, difficult to control, and loses the high efficiency of precision forging. , energy-saving features, difficult to achieve industrial applications

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