Study on the Compound Extrusion Process of Automobile Steering Knuckle Shaft Sleeve

ZHANG Liangying; ZHAN Yanran; LU Jintao

doi:10.3969/j.issn.1674-6457.2025.07.024

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (7) : 228-235. DOI: 10.3969/j.issn.1674-6457.2025.07.024

Advanced Manufacturing Technology and Equipment

Study on the Compound Extrusion Process of Automobile Steering Knuckle Shaft Sleeve

ZHANG Liangying¹, ZHAN Yanran², LU Jintao³

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Abstract

The work aims to study the compound extrusion process of automobile steering knuckle shaft sleeve, in order to improve the material utilization rate in the processing of automobile steering knuckle shaft sleeves and achieve ideal dimensional accuracy as well as better fatigue strength. Based on the cup-rod structural characteristics of automobile steering knuckle shaft sleeve, a method combining theoretical process analysis and forming simulation analysis was adopted. After comparison between the one-pass compound extrusion forming process scheme and the pre-processed compound extrusion process scheme, the final process scheme was determined. The metal flow law and equivalent strain distribution during compound extrusion were analyzed, and an extrusion die was designed for experimental verification. The compound extrusion process scheme for automobile steering knuckle shaft sleeve was as follows: machining, annealing and oxalate treatment, compound extrusion, and drilling. Under this scheme, the load borne by the punch exhibited a trend of “increasing-stabilizing-increasing again-slightly decreasing-significantly increasing”, with a lower maximum load and better die filling effect. During compound extrusion, the proportion of forward extrusion was much larger than that of backward extrusion. The diversion plane was mainly distributed from the lower section of the cup wall to the 35° cone angle, and the interface exhibited a trend of “blurry-clear-blurry” as the punch descended. The maximum equivalent strain was mainly distributed in the area where the dimensions of the part changed. The laws of metal flow and equivalent strain distribution during compound extrusion can provide a certain theoretical basis for the promotion and application of compound extrusion technology for similar parts. The pre-processed compound extrusion process for forming automobile steering knuckle shaft sleeves is reasonable and can fulfill the requirements of actual mass production.

Key words

automobile steering knuckle shaft sleeve / compound extrusion / process design / numerical simulation / experimental research

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ZHANG Liangying, ZHAN Yanran, LU Jintao. Study on the Compound Extrusion Process of Automobile Steering Knuckle Shaft Sleeve[J]. Journal of Netshape Forming Engineering. 2025, 17(7): 228-235 https://doi.org/10.3969/j.issn.1674-6457.2025.07.024

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