About performance of Pogo pin compression spring

Cnomax ENGINEERS WILL TELL YOU THAT TORSIONAL PERFORMANCE IS AN IMPORTANT CRITERION FOR cold DRAWN CARBON SPRING STEEL WIRE. The essence of compression spring torsion test is: rotate the steel wire along the center, so that the steel wire section from inside to outside produce uneven deformation, the more far away from the center under the greater torque, when the compression spring deformation stress accumulates to more than the bearing capacity, the steel wire fracture. If the steel wire section is uniform in structure and composition, without defects, the torsion fracture is flat, perpendicular or nearly perpendicular to the axis; If the cross section organization, composition is not uniform, there are obvious defects, torsional fracture is irregular layer or tear. According to the characteristics of torsion deformation, it can be seen that the number of torsion is closely related to the diameter of steel wire. The section torque of large size steel wire is different, the uneven deformation is more intense, and the number of torsion can be borne is low. Small size steel wire can bear higher torsion times obviously.

The analysis also shows that the torsion test mainly evaluates the surface quality and internal stress distribution of steel wire. Surface cracks, edge pricks, scars and folds of steel wire will lead to a significant decrease in the number of twists. Uneven distribution of internal stress or improper cooling, poor lubrication, bad die during wire drawing will lead to high temperature rise of wire and aging strain will significantly reduce the torsional performance. From the perspective of process operation, increasing the drawing pass and reducing the surface rate (10%) can change the stress distribution and increase the torsion times of the steel wire. From the Angle of structure analysis, increasing the grain size or increasing the thickness of soxtenSItic sheet can increase the torsion value, the actual operation of compression spring is to reduce the winding speed of lead bath treatment, increase the furnace temperature and lead temperature.

Related reading: the elastic coefficient of compression spring calculation formula