Combined spinning treatment method for stress relief and strengthening of conical die forgings

By employing a cold spinning composite treatment method, the problem of residual stress elimination and strengthening in tapered forgings was solved, achieving efficient stress relief and strengthening of the material, and significantly improving the mechanical properties and production efficiency of the forgings.

CN122279164APending Publication Date: 2026-06-26HANGQIAO NEW MATERIAL TECH (BINZHOU) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HANGQIAO NEW MATERIAL TECH (BINZHOU) CO LTD
Filing Date
2026-04-16
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively eliminate residual tensile stress introduced by quenching in tapered forgings while simultaneously improving material strength. Furthermore, traditional methods suffer from high mold costs, poor versatility, stress concentration risks, and limited strengthening effects.

Method used

A combined cold spinning process, including quenching, cold spinning, and aging, is employed. By precisely controlling the amount of spinning deformation, the number of passes, and the cooling method, uniform deformation and stress relief are achieved in the tapered forgings, and material strengthening is carried out on this basis.

Benefits of technology

It achieves efficient elimination of residual stress in tapered forgings, refines grains, significantly improves material strength and plasticity, shortens production cycle, adapts to different product specifications, and meets precision machining requirements.

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Abstract

This invention relates to a spinning composite treatment method for stress relief and strengthening of conical forgings, belonging to the field of hot working and surface strengthening treatment of metallic materials. The method includes the following steps: S1 quenching treatment; S2 cold spinning treatment, which sequentially includes selecting forward or reverse spinning, installing arc-shaped or conical spinning wheels, setting the spindle speed and feed ratio, performing spinning with the first pass deformation ≀2%, and subsequent passes increasing to 3%–5% of the wall thickness, while simultaneously controlling the temperature rise to ≀50℃ through forced cooling, controlling the roundness error to ≀0.3 mm, and the wall thickness uniformity error to ≀±0.2 mm; S3 aging treatment. The advantages of this invention are: through uniform overall deformation by cold spinning, residual tensile stress is eliminated, work hardening is triggered, brittle phases are broken, and grains are refined, achieving synergistic stress relief and strengthening. The stress relief rate is ≄85%, the yield strength is increased by 8%–12%, and the elongation is maintained well. No special molds are required, and it is suitable for conical forgings made of aluminum alloys, titanium alloys, and ultra-high strength steel.
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