Detailed Disc Spring Inspection Guidelines: Building a Quality Assurance Line for Reliability

In the manufacturing and procurement of disc springs, a clear and rigorous inspection protocol serves as the cornerstone for ensuring consistent product quality in mass production. Jiangsu Sunzo Elastic thoroughly implements the "National Standard for Disc Springs" GB/T 1972 and the "Counting Sampling Inspection Procedure" GB/T 2828.1, establishing a scientific quality evaluation system. This article provides a comprehensive analysis of the critical quality control processes in disc spring technology, covering defect classification to type testing.

1、Defect hierarchical management: Focus on key quality characteristics

The national standard has scientifically classified the defects of disc springs, aiming at grasping the key points and effectively allocating inspection resources.

A Class defects (core performance defects): including fatigue, decarburization, hardness. These items are directly related to the service life, strength and safety reliability of disc springs, and are the red line of quality control.

B Class defects (critical dimensions and characteristic defects): include load, inner diameter, outer diameter and permanent deformation at `H₀ -0.75h₀`. These items directly affect the installation, performance and dimensional stability of the disc spring.

C Class defects (general size and appearance defects): include thickness, free height, surface quality and surface roughness. These are the basic requirements to ensure product consistency and appearance.

This hierarchical management reflects the scientific quality management idea of "grasp the big and let go of the small, guarantee the core" in the design and manufacturing of disc springs.

2、Sampling inspection and inspection level

The batch inspection of disc springs complies with GB/T 2828.1 standards, utilizing the S-4 special inspection level. This level is designed for scenarios with high inspection costs or significant destructive testing requirements, ensuring effective quality control while maintaining statistical validity. The specific sample size, sampling plan, and acceptable quality level (AQL) are clearly defined in GB/T 1972-2005, providing both suppliers and buyers with a fair and unified acceptance standard.

3、Type inspection: the key link to ensure the consistency of the process

In addition to the routine factory inspection, type inspection is an important means to verify the comprehensive performance of the product and the consistency of the production process. In the following three cases, type inspection must be carried out:

1. The new product is ready for production and appraisal after trial production;

2. After formal production, if the source of materials or core process is significantly changed, which may affect the performance of the product;

3. When production is resumed after more than two years of suspension.

The type test covers all items, including decarburization and hardness in class A defects, as well as all class B and C defects. This is a "full check-up" of product performance and quality.

Professional quality inspection system provides you with deterministic guarantee

At Jiangsu Sunzo Elastic, we believe that reliable disc spring technology is not only reflected in outstanding design and manufacturing, but also in a rigorous and traceable quality assurance system. Through scientific defect classification, strict sampling inspections, and type testing at critical stages, we ensure every process from raw materials to finished products remains under control. This guarantees you consistent performance and long-lasting durability in our disc spring products.

If you need detailed disc spring inspection standards or discuss quality requirements for specific applications, our quality and technical team is happy to provide you with professional support.