Complete Disc Spring Inspection Guide: Adhering to National Standards for Precision Engineering Excellence

The performance and reliability of disc springs directly determine the safety and stability of the entire mechanical system. A scientific and rigorous quality inspection system forms the foundation of exceptional products. Jiangsu Sunzo Elastic Depth complies with the "National Standard for Disc Springs" GB/T 1972, establishing comprehensive quality control specifications that exceed industry standards. This article systematically explains the complete testing process of disc springs, from geometric dimensions to fatigue tests, demonstrating how professional disc spring technology ensures superior performance in every product.

1、Geometric detection: Precision is the prerequisite for performance

All tests are carried out after the permanent deformation test is qualified to ensure the basic reliability of the data.

Thick (t): Use a micrometer to measure at least three points along the circumference of the disc spring's central area, with the maximum value as the standard. This is the core parameter for calculating load and stiffness.

Diameter (D/d): Use a vernier caliper with a graduation less than 0.02mm to measure at least three points around the circumference, taking the maximum for the outer diameter and the minimum for the inner diameter. This is crucial for the installation and assembly fit of the disc spring.

Free height (H₀): On a secondary precision platform, use a depth gauge with a graduation value less than 0.02mm. Measure at least three points around the circumference, and take the maximum value as the reference for deformation calculation.

2、Feature detection: Key to verifying core performance

load （P）：

Test criteria: Both single and composite disc springs shall be tested on precision testing machines with accuracy of no less than ±1%, measuring the load when loaded to the specified height (H₀ -0.75h₀·i). This point selection is the culmination of theoretical and practical optimization within the national standard for disc springs.

Rigorous process: Lubricant is required for the test. The hardness of the two end pressure plates is ≥52 HRC, and the surface roughness Ra is <1.6μm, so as to minimize friction and wear and ensure the authenticity of data.

Permanent deformation: The disc spring is compressed three times continuously under twice the f≈0.75h₀ load. The difference in free height between the second and third compressions represents the permanent deformation. Qualified products must maintain their post-deformation height within the tolerance limits specified by the national standard.

Hardness and decarburization:

Hardness testing shall be performed at the center of the upper surface of the disc spring in accordance with GB/T 230.1 or GB/T 4340.1 to ensure that the material properties meet the requirements.

The depth of the decarbonization layer is inspected according to GB/T 224 to prevent fatigue strength reduction caused by surface decarbonization.

3、Surface and durability testing: the pursuit of perfection in detail

Surface quality: Use a 10x magnifying glass for visual inspection to ensure no cracks, folds or other fatal defects.

Surface roughness: Use a roughness comparison sample to ensure smoothness and reduce stress concentration.

Fatigue testing is conducted using sinusoidal wave loads on a fatigue testing machine. A pre-compression test is required before the actual test to simulate real-world conditions. For composite disc springs, the testing criteria can be mutually agreed upon by both suppliers and customers, demonstrating the flexibility and specificity of the testing protocol.

Professional quality check to ensure your design

At Jiangsu Sunzo, we firmly believe that reliable testing data is the cornerstone of successful disc spring design and selection. We not only provide products compliant with the "National Standard for Disc Springs", but also ensure through our rigorous quality control system that every disc spring delivered to you maintains highly predictable and consistent geometric dimensions, load characteristics, and durability. This guarantees the elimination of uncertainties for your equipment design and reliable operation.

If you need a disc spring inspection report or technical standard for your specific application, our engineering team can provide you with detailed technical support.