English Views: 68 Author: Site Editor Publish Time: 2025-12-22 Origin: Site
Standard Evolution and Manufacturing Practice:Specification Interpretation of Four Corner Flattening Dimension of Disc Spring
The updated national standard GB/T 19722023 "Disc Spring" has refined technical specifications for disc spring products. A notable detail is the explicit requirement for chamfering (rounding) at the four corners of the spring. As a professional disc spring manufacturer and standard participant, Jiangsu Sunzo Spring will analyze the changes in chamfer dimensions and engineering considerations in the new national standard, combining its manufacturing expertise with practical experience.
Firstly, it is necessary to clarify that due to the characteristics of manufacturing processes such as stamping and forging, there always exists a certain process fillet at the edges of the actual produced disc springs. The ideal sharp corner is difficult to achieve in engineering and is not conducive to stress distribution. Therefore, it is of practical significance to standardize the fillet size.
In traditional manufacturing practices, while standards didn't specify exact values, responsible manufacturers established internal specifications to control quality and ensure consistent performance. For instance, Jiangsu Sunzo Spring adopted an internal control criterion: the fillet radius R = min{D/320, t/8} (where D is the outer diameter and t is the thickness). This criterion considered the disc spring's dimensions to ensure proper proportionality between the fillet and the overall structure.
The new standard officially recognizes and clarifies this manufacturing feature, permitting chamfering of the four corners of disc springs. More importantly, it does not mandate a uniform chamfer value but offers greater flexibility. The chamfer dimensions can be agreed upon by both parties in the contract or determined by the manufacturer based on product application and manufacturing capabilities. This demonstrates the standard's adaptability to diverse engineering requirements.
When setting your own rounded corner dimensions, you may refer to the design practices of established industry products. For example:
The recommended value of the round corner size of high reliability disc spring for heavy duty brake is about 1/5 of the thickness (t/5) in JB/T 3812.
The reference value is derived from the strict requirements of fatigue life and stress concentration in this application field, and has good engineering representativeness.
At Jiangsu Sunzo Spring, we actively implement the latest national standards for disc springs. For the control of fillet dimensions, we adhere to the following principles:
Standard Compliance: We support and implement the flexibility provided by the new standard, enabling us to manufacture disc springs with specific corner radii according to explicit requirements in customer drawings or technical agreements.
Performance-Oriented Approach: Unless otherwise specified, we will leverage our extensive disc spring technology expertise to implement a proven chamfering process that optimizes stress distribution and enhances fatigue life. While maintaining our internal best practices (e.g., R = min{D/320, t/8}) validated through extensive product testing, we also incorporate industry benchmarks such as t/5.
Process stability: Regardless of the final value, we ensure batch consistency and shape regularity of fillet dimensions through precision mold manufacturing and process control.
We understand that details determine quality. A tiny fillet on the edge of a disc spring affects stress concentration coefficients, fatigue crack initiation risks, and ultimately product reliability. We are committed to combining standard evolution with manufacturing craftsmanship, delivering disc springs with superior performance and higher consistency while meeting specifications.
