Winding technique for waist drum type spring

Abstract

The invention relates to a rolling process of a drum-type spring, which is a hot-roll molding technology, including a first process: blank is turned into a plurality of bars which are changed from both ends into the diameters of the bars; a second process: After turning, the bars are heated; a third process: the bars heated after the three steps are heated and rolled into a drum-type hot spring: by a first spring coiling machine, the bars are rolled from the beginning of one end into the drum-type spring; by a second spring coiling machine, the bars are rolled from the other end into another drum-type spring which is symmetrical to the former one, with a straight line left in the middle part which is punched into a preset outer diameter; a fourth process: the drum-type spring made by heat rolling is carried out quenching and tempering, so as to make the drum-type spring. The rolling process is simple, the rolling quality is high and the speed is high; both transitional rings of the drum-type spring can be greater than 2.5, besides, all the line diameter, the outside diameter, the stiffness and the pitch can be changed.

Description

technical field [0001] The invention belongs to a process method of rolling a spring, in particular to a process of rolling a drum-shaped spring capable of improving the quality of the spring. Background technique [0002] Generally, the springs used in the rear axle of automobiles are rolled into cylindrical springs. Due to the same wire diameter, the products of this cylindrical spring are heavier and larger in size. They are used in rear axles of automobiles, and Passenger comfort also suffers. Therefore, at present in the industry there is a waist drum type spring that can change the wire diameter (section), outer diameter, stiffness, and pitch and can reduce the weight of the spring product itself. [0003] The roll forming process of waist drum spring includes hot rolling process and cold rolling process. [0004] Generally, there are two types of hot rolling processes, one is a spring with a small ring at one end, which is directly rolled into a half-waist drum-shap...

AI Technical Summary

Problems solved by technology

[0004] Generally, there are two types of hot rolling processes, one is a spring with a small ring at one end, which is directly rolled into a half-waisted drum-shaped spring; The pigtail forming machine rolls twice, but this rolling method is limited by the pigtail forming machine, and can only rotate 2.5 turns at most, which is not suitable for springs whose transition circles at both ends are greater than 2.5 turns

Images