In fact, for the spiral compression spring, after the end face is ground, if the free height, perpendicularity, pitch and outer diameter of the spring do not reach the prescribed deviation value, correction processing is often required.

Calibration operations are now generally basically in manual or semi-manual operation. Commonly used tools are: when the spring wire is greater than 4mm, tools such as a hand press, slitter, punch, etc. are generally used. If the wire in the spring is less than 4mm, we usually use special tools, pliers, hammers and other tools with wedge-shaped cutting edges. Calibration processing is to use these tools to locally deform the spring to achieve the required size of the pattern.