Method and device for manufacturing initial tension spring

Abstract

The invention provides a method and device for manufacturing an initial tension spring. The method comprises the steps of enabling an unwound steel wire to be wound on a core rod (2), obtaining an initially wound steel wire, and enabling a first end of the initially wound steel wire to be fixed on the core rod (2); sleeving a device (3) for manufacturing the initial tension spring outside the corerod (2), and rotating the device (3) for manufacturing the initial tension spring in the direction opposite to the rotating direction of the initially wound steel wire from a second end of the initially wound steel wire, so that the initially wound steel wire is released circle by circle; obtaining a spiral steel wire which is sleeved outside the device (3) for manufacturing the initial tension spring and has initial tension; and manufacturing hook rings at the two ends of the spiral steel wire with the initial tension, and obtaining the spring. The reserved torsional shear stress can reach the yield limit of the material, the steel wire is not prone to cracking, the machining method is simpler, and control is easier.

Description

technical field [0001] The invention belongs to the technical field of springs, and in particular relates to a method and a device for manufacturing an initial tension spring. Background technique [0002] The existing initial tension spring processing techniques include methods such as tightening the steel wires, applying torque to the steel wires, and secondary winding and forming, which have the following deficiencies and defects: [0003] 1. The processing process is accompanied by plastic deformation, and the torsional shear stress that can be retained in the spring steel wire is limited. Generally, the retained torsional shear stress is in the range of 0MPa-200MPa; [0004] 2. In the secondary winding method, the steel wire undergoes two plastic deformations, and the steel wire is easy to form cracks. Contents of the invention [0005] The invention provides a method and device for manufacturing an initial tension spring, which solves the problems of limited torsion...

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Problems solved by technology

[0005] The present invention provides a method and device for manufacturing an initial tension spring, which solves the problems of limited torsional shear stress and easy cracks in the existing initial tension spring processing technology

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