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Spring quality appraisal

Spring quality appraisal-Machinery & Equipment-CAS Testing Technical Services (Hong Kong) Company Limited

Spring massAppraisal Background

Spring is a kind of elastic element widely used in the mechanical and electronic industries. The spring can produce large elastic deformation when loaded, and convert mechanical work or kinetic energy into deformation energy. After unloading, the deformation of the spring disappears and returns to its original state, and at the same time, the deformation energy is converted into mechanical work or kinetic energy.
spring has the function of buffering and damping: such as the damping spring under cars and trains, the buffer spring of various buffers, etc.
Zhongke Testing and Appraisal Institute can provide spring quality appraisal services and make accurate appraisals in terms of product design analysis, load analysis and product quality analysis.

Spring massAppraisal Scope

can be divided into: compression spring, tension spring, torsion spring, bending spring according to the force properties;
can be divided into: spiral spring, scroll spring, leaf spring, disc spring, ring spring, special-shaped spring according to the shape;
can be divided into cold coil spring and hot coil spring according to the production process; according to the production material, it can be divided into metal spring, plastic spring, rubber spring and other material springs.

Spring massAccreditation criteria

GB/T 23934-2015 Hot rolled cylindrical spiral compression spring Technical conditions
GB/T 1239-2009 Cold rolled cylindrical spiral spring Technical conditions
GB/T 20914-2019 Die Nitrogen spring
GB/T 7245-1987 Saddle spring washer
GB/T 7246-1987 Wave spring washer
GB/T 7244-1987 Heavy duty spring washer
GB/T 859-1987 Light spring washer

Spring massAuthentication case

The plaintiff and the defendant signed an "Industrial Products Sales Contract" on X, month, X, and the defendant supplied springs to the plaintiff. According to the contract, the goods arrived at the plaintiff's site and were inspected. They did not meet the technical standards and had quality problems. The plaintiff raised quality objections during the acceptance period and requested the defendant to return the goods, but so far the defendant has not received any response. Therefore, the plaintiff went to court as mentioned above.
Our company was entrusted by the court to undertake the quality analysis of the "spring" involved in this case.
identification and analysis results: The
quality analysis expert group discussed and comprehensively technical analyzed the relevant information, on-site investigation and inspection, and inspection and testing data of the "spring" involved in the case, and made the following quality analysis opinions: The hardness of the "spring" involved in the case of
has been tested and complies with the requirements of the GB/T23934-2015 standard. However, compliance with the standard requirements does not mean that the spring characteristics also meet the specified requirements. Judging from the existing damaged springs, they were damaged shortly after installation and worked normally after being replaced with new springs. No matter what the reason was, the springs involved in the case could not meet the actual working needs. In summary, the processing quality of this batch of springs did not meet the quality requirements of both parties in the industrial product sales contract.

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