Compression spring grinding and polishing processing cost reduction

By eliminating the grinding process on both ends, cost reduction can be expected.

When the wire diameter of a compression spring is thick, the ends of the spring are ground flat. Grinding is also referred to as polishing. The purpose of grinding is to improve the seating of the spring. Now, regarding the wire diameter at which grinding is performed, it is not actually specified in the JIS standards. Many spring-related publications suggest that grinding is done for wire diameters of 0.5mm or more. If grinding is not performed, the price of the spring will be lower. Therefore, if there are no issues with usage, I recommend considering "no grinding" even for wire diameters of 0.5mm or more. As a guideline, if the wire diameter is 2.0mm or less and the spring index (the value obtained by dividing the average coil diameter by the wire diameter) is 13 or more, it is considered that the spring can be used without grinding and still have good seating. For this spring, the wire diameter is 2.0mm, the average coil diameter is 28mm, and the spring index is 14. How does that look? The spring on the left in the photo has good seating visually, and the perpendicularity meets JIS Class 2 (approximately 2.9 degrees) and is kept below 2 degrees. If you have any questions about "grinding" for compression springs, please feel free to consult us. We can also accommodate prototype assessments with a short lead time.

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