Modular multi-strand coil spring CNC machining machine

Abstract

A modularization NC machining tool for stranded-wire helical springs comprises a strand twisting device, stranded-wire helical spring continuous spring coiling devices and a control system. The strand twisting device comprises at least one stranded-wire helical spring rotary strand twisting device which are connected in series, central passive unreeling machines which are farthest from the spring coiling device and arranged corresponds to the stranded-wire helical spring rotary strand twisting devices and doubling die holders which are arranged corresponds to each stranded-wire helical spring rotary strand twisting device. Each stranded-wire helical spring continuous spring coiling device comprises a spring coiling device and a traction pushing device. The modularization NC machining tool for the stranded-wire helical springs can realize accurate rotating speed matching among each device, accurately control the distances of steel ropes and the screw pitch of the springs, strictly ensure that the tension of each strand of steel wires is even and the size is the same, and eliminate the twist internal stress or provide the twist prestress at any back-twist rates of the steel ropes. Therefore, the quality of the finished stranded-wire helical springs can be ensured and the service life can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of multi-strand coil spring processing equipment, and in particular relates to a modular multi-strand coil spring numerical control processing machine tool. Background technique [0002] Multi-strand coil spring (referred to as multi-strand coil spring) is a coil spring made of several strands of steel wire wound into a steel cable. High strength, at the same time, when the multi-strand coil spring is deformed, the mutual friction caused by the contact pressure between the strands of steel wire can absorb energy, and also has a buffering effect, and the stiffness of each strand of the multi-strand coil spring is higher than that of a single strand with the same function The coil spring is small, and its life is greatly improved under the action of dynamic load. Its service life is 3-5 times that of the traditional single-strand coil spring of the same specification. Therefore, multi-strand coil springs are...

AI Technical Summary

Problems solved by technology

[0004] 1. The tension collection point of the multi-strand coil spring CNC machine tool is far away from the end of the winding cable, that is, the tension collection point is placed near the wire outlet end, so the actual controlled tension is the tension near the wire outlet, and the steel wire exists in the winding process. Bending, as well as friction with the guide and traction mechanism, cause the tension of each strand of steel wire in the wire tension controller of the multi-strand spring CNC machining machine tool to be uneven at the cable winding, and the input end of the magnetic powder brake is fixedly installed. Once the steel wire In the event of wire jumping, the tension of the steel wire will quickly drop to zero; that is, in the prior art, the tension control method in the production process is not perfect, which cannot meet the actual application requirements, and seriously affects the production pass rate and the quality of the multi-strand coil spring;

[0005] 2. During the processing of multi-strand coil springs, different steel cable distances require different back-twist rates to eliminate torsional internal stress to ensure the mechanical properties of multi-strand coil springs; the multi-strand coil spring CNC processing machine adopts natural back-twist Or 100% back-twisting method to eliminate the torsional internal stress of the steel wire, but it will still cause unstable residual torsional internal stress in the steel wire;

[0006] 3. The core coil spring mechanism adopted by the multi-strand coil spring CNC machine tool leads to the fact that the processing process cannot be truly automated, and has the defects of low production efficiency, low degree of automation and large production labor. The geometric accuracy of the coiled spring is Not high, only suitable for small batch production

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