Writing a Spring Fatigue Test Plan: Stroke, Frequency, Environment and Failure
“Test one million cycles” is incomplete without mounting, motion and acceptance criteria.
GONGNENG ENGINEERING
Practical guides covering spring design, materials, processes, fatigue, industry applications and sourcing
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Spring First Article Inspection: Dimensions Are Only the First Layer
First article approval should cover revision, material, process, functional load, appearance and production control.
Cp and Cpk in Spring Production: Stability Comes First
Capability is not a decorative number from one sample. It requires a reliable measurement system and a controlled process.
When Good Springs Arrive Distorted: Packaging Is Part of Quality Design
Long torsion legs, fine extension hooks and wire forms can tangle or crush, so packaging should follow geometry risk.
Why Compression Springs Bow: Slenderness, Ends and Guidance
A slender compression spring can deflect laterally under axial load, adding friction, noise and local stress.
Permanent Set vs Stress Relaxation: Similar Symptoms, Different Causes
Overload-driven permanent deformation and time-dependent load loss under fixed deflection need different controls.
Spring Corrosion Fatigue: A Small Pit Can Start a Crack
When cyclic stress and corrosion act together, material, finish, drainage and maintenance must form one solution.
What to Do After a Spring Breaks: Evidence and Sampling Checklist
Fracture surfaces, installed position, load history and same-lot samples are core evidence and should not be cleaned or discarded.
Automotive Spring Development: Quality Planning and Traceability
Automotive springs require special characteristics, life, environment, process change and traceability to be planned early.