Effect of Change in Parameters like Material, Wire Diameter, Pitch on Fatigue Life of Helical Spring used in Stamping Machine

Compression Springs plays vital role in industrial field. Compression spring or coil spring is used to resist axial compressive force. The available different shapes are cylindrical, conical, tapered, concave, convex. By changing spring parameters such as spring constant, spring ends, material & material finish, wire diameter, pitch, free length, outer diameter allows meeting industrial requirement. The Sheet metal industry needs 'die' for manufacturing stamped components. The stripper for the die uses a set of coiled springs sandwiched between the top plate and the stripper. It operates under high frequency of cyclic operation, typically 30 to 60 cycles per min (with a maximum of about 300 strokes per minute). High spring rate is the characteristic feature of this application. This poses a challenge for designing an appropriate spring for the given application & its predefined period. For designing proper compression spring, it needs to be considering all load, movement and available space for spring. Though this is an option of selecting the nearest available specification for the standard variety of spring. The spring is designed and modeled using CAD software. This further evaluated using FEA software for static, fatigue analysis for cyclic loading and produces the best suitable compression spring.