The manufacture of equi-rigidity conical springs is complicated by the winding trajectory. The outer diameter, pitch, helix angle and cone angle of the spring are all variables. It is difficult to form when winding with ordinary equipment. When the core automatic coil spring machine is rolled, the spring radius change function and the height change function can be programmed and input into the automatic coil spring machine to be wound and formed. If it is limited by the equipment, only the core coil can be used. The manufacturing precision of the mandrel is the key to determining the accuracy of the spring forming. Design of the coil spring mandrel The following mandrel design parameters are based on the first end of the winding. The same applies to the support ring mandrel design. Finally, the height of the apex of the mandrel spiral groove relative to the big end starting point is determined.
It is found through experiments that the height before and after the roll and the height before and after heat treatment do not change much. Therefore, the calculation of the height of the mandrel spiral groove only needs to consider the change of the number of turns. The height of the mandrel support ring should be theoretically certain, but due to the impact of the rebound, the support ring must be increased before rebounding, so the support ring mandrel spiral groove can only be designed in the form of a tight circle, the corresponding pitch Equal to the material diameter d. The manufacture of the coil spring mandrel is because the spiral track of the spring mandrel is a three-dimensional ternary function curve, so only the three-dimensional machining center is used to machine the spiral groove of the mandrel. The design and production of the equi-rigid conical spring is more complicated, but it has the characteristics of achieving the ultimate deformation, constant stiffness, and full deformation resistance. Can be widely used in mechanical design. This paper provides a theoretical basis for the design and manufacture of equal-rigidity conical helical compression springs.
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