Analysis of Disc Spring Manufacturing Process: Material Selection and Process Flow by Thickness Grouping

The performance and reliability of disc springs fundamentally depend on their manufacturing processes and material selection. The "National Standard for Disc Springs" GB/T 1972 categorizes disc springs into three groups based on thickness (t), specifying corresponding materials and production processes for each group. Jiangsu Sunzo Spring strictly adheres to this standard, ensuring every step from raw materials to finished products meets high-quality specifications through advanced disc spring technology.

1、Group I Disc Spring (t ≤ 1.25 mm): A streamlined process for excellence

For thin-walled Group I disc springs, high-carbon steel (e.g., 65Mn) is typically used. The manufacturing process is straightforward and efficient, achieving design objectives through precision stamping, followed by heat treatment and high-pressure treatment. This process eliminates the need for additional machining, demonstrating a balance between cost-effectiveness and reliability when using standardized materials.

2、Group II Disc Springs (1.25 <t ≤ 6 mm): A perfect balance between material selection and precision engineering

When the thickness increases to the range of group II, higher requirements are put forward for the strength of the material and the process.

Material upgrade: The standard recommends alloy spring steel with superior performance, such as 60Si2MnA or 50CrVA.

Key process: The inner and outer surfaces of this group of disc springs must be machined to completely eliminate micro-cracks (tears) that may occur after stamping, which is critical to improving the fatigue life of the disc springs.

Material processing: Considering national conditions, for materials with thickness greater than 3 mm, if hot-rolled plates are used, the surface oxide and decarburization layer should be removed by stripping, turning or grinding to provide clean and high-quality base material for subsequent processing.

3、Group III disc springs (6 <t ≤ 16 mm): Core forging process ensuring quality

For thicker Group III disc springs, forging conical blanks is the preferred method to ensure complete material flow lines and dense internal structure. This proven process delivers high-thickness, high-load-bearing disc springs. The forging process refines grain structure and optimizes mechanical properties, enabling reliable performance under heavy-duty conditions.

4、Powder blasting strengthening: a general key technology to improve fatigue life

Regardless of the application group, shot peening becomes an essential process when high fatigue life requirements are imposed on disc springs. This treatment not only cleans surfaces and seals microcracks, but also introduces beneficial compressive stress into the spring's surface layer. By effectively counteracting tensile stresses during operation, it significantly delays the initiation and propagation of fatigue cracks.

At Jiangsu Sunzo Spring, we deeply understand the core technology of disc springs in various specifications. We strictly follow national standard classifications, scientifically select materials, and meticulously control every process from material cutting to strengthening treatment. We are committed to providing customers with disc spring products featuring stable performance and long service life, along with professional design support.