What are the selection requirements for the guide wheel of the middle wire cutting machine?

The guide wheel of the middle wire cutting machine is a very important part. It is also indispensable for the cutting quality, so the requirements for the guide wheel are relatively high. Below we talk about the requirements of the guide wheel movement assembly.

1. The v-groove surface of the guide wheel should have higher precision. The radius of the arc of the V-shaped groove bottom must be smaller than the radius of the selected electrode wire to ensure that the wire does not move axially when moving in the guide groove.

2. Under the requirement of certain strength, the quality of the guide wheel should be reduced as much as possible to reduce the sliding friction between the wire and the guide wheel when the wire is reversing. The working face of the guide groove should have sufficient hardness to improve its wear resistance.

3. After the guide wheel is assembled, the rotation should be light and flexible, and the axial turbulence and radial circular runout should be minimized.

4. Perform effective sealing to ensure the normal working conditions of the bearing.

There are three main structures of the middle wire cutting guide wheel movement assembly: a suspended powder support structure, a double support structure and a double shaft tip support structure. The following is a brief introduction to the characteristics of each of these three structures.

1. Cantilever support structure, simple structure and convenient wire feeding. However, due to the cantilever support, the stability of the tensioned electrode wire is poor, it is difficult to maintain high motion accuracy, and also affects the service life of the guide wheel and the bearing.

2. The double support structure is centered on the guide wheel, and the two ends are supported by bearings. The structure is more complicated and the wire is more troublesome. However, the structure has good motion stability, high rigidity, and is less prone to deformation and jitter.

3. Double shaft tip support structure. Both ends of the guide wheel are machined into a 30° tapered shaft tip with a hardness of 60HRC or more. The bearing is made of ruby ​​or tin phosphor bronze. Choosing a quality machine tool attachment to identify Titanium machinery, this structure is easy to ensure the coaxiality of the guide wheel motion assembly, the axial rotation of the guide wheel and the radial ring runout can be controlled within a small range. The disadvantage is that the shaft tip has a large frictional force and is prone to heat and wear. In order to compensate for the wear of the shaft tip pair, the force of the spring is used to make the motion pair in good contact. Wire cutting In addition, the guide wheel supports a sliding support structure.

Choosing the right guide wheel is necessary for the wire cutting process, so the buyer needs to pay attention to the quality of the guide wheel when purchasing.

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