It is well known that both the upper and lower wire guide nozzles of the slow wire cutting machine are equipped with gem guides, and play a key role in improving the accuracy. Because the wire speed of the slow wire walking machine is very slow, and the material of the wire is copper, the hardness is low, so the electrode wire wears less on the guide. In addition, because the internal stress of the copper material is small, it is easy to straighten, so the electrode wire is It is easy to pass through the guide manually (or automatically).
However, the situation of the medium wire cutting machine is different. Because the electrode wire is molybdenum wire, its hardness and stress are much greater than copper wire. When observing the molybdenum wire under a microscope, there are a lot of "cumulus" on the surface of the molybdenum wire. When the molybdenum wire runs at high speed, it is no different from the "wire saw" for the guide. Therefore, compared with the slow wire, the wear of the guide is very large, and it is difficult to coincide the molybdenum wire between the small hole of the guide and the upper and lower main wheels during the installation of the guide. This not only accelerates the wear of the guide, but also directly affects the spatial position of the molybdenum wire during cutting.
The impact on the accuracy of the position of the mold processing and the consistency accuracy of the same parts are very fatal. In addition, because the internal stress of the molybdenum wire is very large, the small hole of the guide can only be 0.01mm larger than the diameter of the molybdenum wire (otherwise there is no guiding effect), and the guide and the molybdenum wire are stuck with the working fluid, so the operator should put the molybdenum wire It is very difficult to pass through this small hole, which is a huge test for the operator's patience. Judging from the actual application situation, most customers have finally abandoned the application of the guide. It can be seen that for the medium wire cutting machine, the application of the guide is not the key to improving the accuracy and finish of the medium wire.
