Manufacturing process for valve spring

Abstract

The invention discloses a manufacturing process for a valve spring. The process includes the steps that spring coiling is carried out, specifically, cold coiling is conducted on a spring steel wire in an annealed state, so that a primary finished valve spring is obtained; quenching is conducted on the coiled primary finished valve spring; tempering is carried out on the quenched primary finished valve spring; spring grinding is carried out, specifically, the two end faces of the tempered primary finished valve spring are ground; the first time of shot blasting is carried out on the ground primary finished valve spring; the second time of shot blasting is carried out on the primary finished valve spring subjected to the first time of shot blasting; and the primary finished valve spring subjected to the second time of shot blasting is highly compressed to a regulated height, so that the finished valve spring is obtained. Compared with a process of manufacturing the valve spring through a steel wire subjected to oil quenching, the manufacturing cost in the manufacturing process is lower, and tension and pressure generated when the spring is coiled can be effectively eliminated.

Description

technical field [0001] The invention relates to a manufacturing process of a valve spring. Background technique [0002] The valve spring is an important part in the gas distribution system of the automobile engine. It mainly plays the role of maintaining the normal contact of the components of the gas distribution system and promoting the sealing of the valve. With today's increasingly tight energy sources, automobiles are developing in the direction of lightweight and low energy consumption, and the high speed of engine speed requires valve springs to have better fatigue performance and anti-relaxation performance under higher working stress. Therefore, this has higher requirements on the strength of the material itself and the technical level of the valve spring. [0003] At present, most of the materials used for valve springs are oil-hardened steel wires. Oil-quenched steel wire has good performance uniformity, and the range of hardness and strength is relatively cons...

AI Technical Summary

Problems solved by technology

[0004] The material cost of oil quenched steel wire is high, and the stress relief cannot be completely relieved during stress relief tempering

Although the residual tensile stress during rolling and forming is eliminated through shot peening, and the compressive stress is applied to improve the strength of the spring itself, the finished spring still has a large rolling residual stress.

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