Coiling and bending create plastic deformation and residual stress. Appropriate stress relief stabilizes the condition, while temperature, time, material and fixturing influence final dimensions.
Why formed parts move
Strain is not uniform through the wire and the part springs back after unloading. Releasing residual stress can change diameter, free length, torsion-leg angle or wire-form bends.
Do not copy parameters across alloys
Carbon steel, stainless and copper alloys have different process windows. Incorrect settings can cause oxide, property change, discoloration or dimensional drift.
Compensation is normal engineering
Manufacturing settings can offset a stable post-heat-treatment shift so the final part reaches target. Establish sample data rather than relying on repeated manual correction.
Inspect in the correct condition
Final dimensions and loads are normally confirmed after specified heat treatment, finishing and any preset operation, with the inspection condition recorded.
References
This article is informed by public standards catalogues and industry engineering resources. Project values should be confirmed by drawings, material certificates and sample validation.