Anti-deforming arrangement of reinforcing wire case tension bourette

Abstract

The deformation preventing device for drawing steel wire from a box is applied in stranded wire helical spring producing machine, especially in numerically controlled stranded wire helical spring producing machine. The deformation preventing device includes one compressed air conveying system, one resistant wire drawing system, one steel wire winding system, one steel wire drawing guide system, etc. It has the features of accurate real-time control in the tension on the steel wire, convenient regulation, small stress on the drawn steel wire, capacity of ensuring high quality of the produced string, etc.

Description

technical field [0001] The invention belongs to the technical field of multi-strand helical spring machine tool processing, and in particular relates to a wire box drawing device of a numerically controlled multi-strand helical spring processing machine tool. Background technique [0002] Multi-strand coil springs are widely used in high-frequency reciprocating mechanical equipment, and their service life is 3 to 5 times that of traditional single-strand coil springs of the same specification. At present, the manufacturing technology of multi-strand coil spring is a technology that is forbidden to be transferred abroad, and it is an important subject of domestic research. [0003] In the production of multi-strand coil springs, due to the deformation of the steel wire during the winding process, the produced springs are often scrapped in large quantities, which cannot meet the actual application requirements, causing huge reputation and economic losses to the producers and u...

AI Technical Summary

Problems solved by technology

[0004] In the existing multi-strand coil spring processing machine tools, two methods of manual and numerical control are used for the control of steel wire tension. In the manual method, the tension degree of each strand of steel wire is completely controlled by the operator's hand feeling, and only screws are used to compress the wire box. , so that the resistance torque is generated when the steel wire box rotates, and as the steel wire in the steel wire box gradually decreases, the maximum outer diameter of the steel wire wound in the steel wire box also decreases, and the resistance to pulling the steel wire increases gradually, and the same length of steel wire During the continuous wire drawing stage, the wire drawing force and pressure gradually increase, and the steel wire is prone to deformation (squashed or elongated); during the CNC production process, the resistance wire drawing system uses a cylinder to directly control the distance between the two resistance discs. The pressure between them and their respective rotational resistances can be used to increase or decrease the resistance of the steel wire, so that the steel wire can be tensioned smoothly and its tension can be controlled. However, the main disadvantage of this method is that the gap between the two resistance discs is very small. Smaller than the diameter of the steel wire passing through it, a point contact is formed when the steel wire passes through it, and all the tension (that is, frictional resistance) of the tension control system is all pressed on this point contact section, and the positive pressure generated (like cold rolling of the steel wire ) is very likely to cause the force of the steel wire to be greater than its allowable pressure, and the steel wire will undergo significant elongation or flattening plastic deformation after being drawn from it.

In addition, the cylinder transmits the pressure to the resistance plate through a multi-stage transmission mechanism. Due to the accumulated friction of each rotating pair of the multi-stage transmission mechanism, the response relationship between the tension and the cylinder air pressure is seriously lagging behind, and it is difficult to accurately control the steel wire in real time. tension

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