Technical Analysis: Does Overgrinding Disc Spring Increase or Decrease Its Force Value?

In the precision manufacturing and quality control of disc springs, even minor thickness deviations can significantly impact final performance. Over-grinding is a process issue requiring strict control. Jiangsu Sunzo Spring will analyze the specific effects of over-grinding on disc spring force values, based on the technical principles of disc springs and two common testing conditions.

1、Key conclusion

The overall trend of the test force value is increased when the disc spring is overgrinding (i.e. the thickness t is reduced) in both the "position displacement" and "height" measurements.

2、In-depth analysis of the principles

1. When the load is moved: the force value increases significantly

The spring was compressed by a fixed deformation (f) to measure the force.

The fundamental mechanism: When the thickness (t) is reduced through grinding, the relative deformation (f/h₀) of the disc spring increases, consequently enhancing its stiffness. More crucially, the mechanical model reveals that thinner thickness shortens the lever arm, requiring greater force to achieve the same deformation. These combined effects result in a significant increase in the measured load under fixed displacement.

2. When the load is measured at a fixed height, the force value still increases.

The measuring condition was that the disc spring was compressed to a fixed working height (H) for force measurement.

Comprehensive analysis: Under these conditions, the situation becomes slightly more complex. Excessive grinding not only reduces the thickness (t) but also decreases the free height (h₀). While the reduction in height tends to decrease the force value, the stiffness increase effect caused by the reduced thickness usually dominates. Therefore, the overall result shows that the force value still shows an increasing trend.

3、Significance of the Design and Quality Control of Disc Spring

This analysis reveals the importance of strictly controlling thickness tolerances in disc spring design and manufacturing. Jiangsu Sunzo Spring adheres to the "National Standard for Disc Springs" and even more stringent internal control standards during production and quality inspection, ensuring precise thickness control for every disc spring.

Consistent performance: Prevents batch product force deviations caused by thickness variations, ensuring optimal assembly and user experience.

Improving product reliability: accurate dimensions are the basis for achieving the expected fatigue life and load performance.

Through precise process control and in-depth technical expertise, we deliver disc spring products with stable performance and reliable quality, along with professional design support to our clients.