A manufacturing process for hollow stabilizer bars in automobiles

By using continuous online induction heating and subsequent processing, the problem of uneven heating in the machining of hollow stabilizer bars for automobiles has been solved, achieving consistency in the mechanical properties of various parts of the stabilizer bar and control of residual stress, thereby improving the overall performance and reliability of the product.

CN122299334APending Publication Date: 2026-06-30JIANGSU HUASHENGZHI NEW MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU HUASHENGZHI NEW MATERIALS CO LTD
Filing Date
2026-05-26
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

The existing manufacturing process for hollow automotive stabilizer bars suffers from uneven heating in the clamping and bending areas, resulting in inconsistent hardness, strength, and fatigue performance, which affects the product's performance consistency and reliability.

Method used

A continuous online induction heating heat treatment process is adopted to uniformly heat the hollow tubes and then quench and temper them. Combined with eddy current testing, cold bending, shot peening and other steps, the mechanical properties of each part of the stabilizer bar are consistent and residual stress is controlled.

Benefits of technology

Significant improvements were achieved in heating uniformity and microstructure properties, which enhanced the overall performance consistency and fatigue life of the stabilizer bar, reduced the risk of residual stress concentration, and improved the product's pass rate and reliability.

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Abstract

This invention proposes a processing technology for hollow stabilizer bars in automobiles. The core of this technology lies in first achieving the final mechanical properties of the tubing through heat treatment, followed by forming and subsequent processing. The process involves online induction heat treatment of the hollow straight tube: sequential induction heating austenitization, quenching (martensitic transformation), and medium-frequency induction tempering (troostitic or sorbitic transformation), followed by water cooling to room temperature and eddy current testing. Then, the hollow straight tube, having achieved its final properties, undergoes end processing (flattening, drilling, welding), followed by cold bending into a three-dimensional shape using a CNC tube bending machine, and immediately undergoes stress-relief annealing to eliminate residual processing stress. Next, cold straightening is used to calibrate the position of key mounting points, followed by shot peening to improve fatigue life. Finally, coating (cleaning, phosphating, electrostatic spraying, baking) forms a protective layer. This process, by prior heat treatment followed by forming, effectively improves the product's heating uniformity, microstructure, and controls residual stress.
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