A Closed Near Net Shaping Technology and Die for Final Forging of Drum Steering Knuckle

Abstract

The invention provides a drum type steering knuckle finish forge and preforge piece closed type near net forming process and die for a drum-type steering knuckle forge piece with a certain offset angle between a fork lug and the axis of a rod part. A drum-type steering knuckle pre-forge piece is obtained through closed-type extrusion near net forming and is placed in a vertically-separable closedtype finish forge near net forming die, forming force and mold closing force are applied through an upper die to form a drum type steering knuckle forge piece. The invention further provides a die forrealizing the process. The working part of the die comprises a male die, a separable combined female die and a combined female die closing and opening mechanism, a horizontal oil cylinder and a T-shaped guide rail are used for enabling the separable female die to be folded to form a female die cavity, the male die is used for applying the forming force, and meanwhile a conical cylinder structureis used to convert the vertical pressure applied by die forging equipment into pressure in the horizontal direction so as to provide a die closing force. Through the closed type near net forming process and the vertically-separable female die structure, the near-net forming of the drum-type steering knuckle finish forge piece can be realized, and the forge piece can be smoothly taken out.

Description

technical field [0001] The invention belongs to a processing method for a steering knuckle forging, and in particular relates to a closed near-net forming process and a mold for a drum-type steering knuckle final forging. Background technique [0002] For drum steering knuckle forgings with a certain deflection angle between the fork lug and the shaft axis ( figure 1 ), the current common forging process includes three steps: billet making, horizontal pre-forging and horizontal final forging. Lu Yan (Forging Die Design Manual (2nd Edition), Machinery Industry Press, 2006.) introduced the horizontal open final forging process based on the three-step billet making and horizontal open pre-forging on the hot forging press , The prominent problem of this traditional die forging process is that the flash metal loss is as high as 27% to 28%. Zhang Yunjun et al. (Development and application of precision forging technology for small flash of automobile steering knuckle. Forging Tec...

AI Technical Summary

Problems solved by technology

Lu Yan (Forging Die Design Manual (2nd Edition), Machinery Industry Press, 2006.) introduced the horizontal open final forging process based on the three-step billet making and horizontal open pre-forging on the hot forging press , the prominent problem of this traditional die forging process is that the flash metal loss is as high as 27% to 28%.

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