A kind of manufacturing method and mold of special double torsion spring

Abstract

The invention discloses a manufacturing method and die for a special duplex torsional spring. The manufacturing method includes the following steps that S1, a winding core bar is mounted on a lathe, and the spiral end on one side of the duplex torsional spring is obtained through winding; S2, the winding core bar is mounted on a bending die, and copying winding is conducted on a middle support lug of the duplex torsional spring; and S3, the spiral end on the other side of the duplex torsional spring is obtained through winding. The duplex torsional spring is molded at a time, a welding procedure is omitted, the cost is reduced, and the service life of the duplex torsional spring is prolonged; and moreover, copying design is introduced to the design of the die, so that not only is production efficiency of the duplex torsional spring improved, but also machining precision of the duplex torsional spring is improved.

Description

technical field [0001] The invention relates to the technical field of torsion spring processing, in particular to a manufacturing method and a mold of a special double torsion spring. Background technique [0002] At present, the processing method of producing double torsion springs with ordinary lathes is to process left-hand torsion springs and right-hand torsion springs respectively with wound mandrels, and then connect the left and right torsion springs into a double torsion spring by welding. [0003] The present processing method has the following problems: (1) raw materials are wasted a lot, and welding is difficult. Since the left-handed and right-handed coils are wound separately, a lot of surplus material will be left in the production process. At the same time, spring steel with a large content of alloying elements is prone to defects such as inclusions and cracks during the welding process. (2) The performance of the spring is reduced. The tensile strength of ...

AI Technical Summary

Problems solved by technology

[0003] There are following problems in this current processing method: (1) There is a lot of waste of raw materials, and the welding difficulty is large

Since the left-handed and right-handed windings are separately wound, a lot of surplus material will be left in the production process. At the same time, as a spring steel with a large content of alloying elements, it is easy to form defects such as inclusions and cracks during the welding process.

(2) The performance of the spring is reduced

The tensile strength of the part material after welding is lower than that of the base metal, which reduces the mechanical properties of the spring

(3) Low processing efficiency

There are many processing steps for springs, and the processing cycle is long

(4) Low machining accuracy

Since left-handed springs and right-handed springs are wound separately, there are differences in their outer diameters and stresses, resulting in large coaxiality errors between left-handed and left-handed springs of the same spring.

At the same time, the ability to guarantee the size of the welding pair is poor, which often leads to the fact that the spacing tolerance between the two corners cannot meet the drawing requirements

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