Vertical self-rotating #wire EDM (horizontal self-rotating wire EDM). The characteristics of the vertical rotary WEDM machine are different from the traditional high-speed WEDM and low-speed WEDM. First, the movement of the electrode wire is one more electrode than the traditional two kinds of WEDM. The rotary motion of the wire; secondly, the wire speed of the electrode wire is between the high-speed wire and the low-speed wire, and the speed is 1-2mm/s. Due to the increased rotation of the electrode wire during processing, the biggest difference between the vertical rotary wire-cutting machine and other types of wire-cutting machines lies in the wire-feeding system. The wire-feeding system of the vertical rotary wire-cutting machine consists of two sets of wire-feeding end and wire-feeding end with the same structure as the wire-feeding structure, which realizes the compound motion of high-speed rotating motion of electrode wire and low-speed wire-feeding. The area between the two sets of spindle heads is the effective processing area. Except for the wire-feeding system, other components of the machine tool are the same as the high-speed #wire-cutting machine.
Compared with unidirectional low-speed WEDM machine tools, there is still a large gap in key technical indicators such as average productivity, cutting accuracy and surface roughness of reciprocating high-speed WEDM machines. In response to these gaps, at the beginning of this century, several high-speed reciprocating wire EDM manufacturers in China realized multiple cutting processes on high-speed wire cutting machines (this type of machine tool is commonly known as “medium speed wire cut”). Electrical Discharge Machining). The so-called “medium wire feeding” does not mean that the wire feeding speed is between high speed and low speed, but a compound wire cutting machine tool. The wire feeding principle is to use 8-12mm/s high speed wire feeding during rough machining and use 1-3mm/s low-speed wire feeding, so that the work is relatively stable and the jitter is small, and the error caused by material deformation and molybdenum wire loss is reduced through multiple cutting, so that the processing quality is relatively improved, and the processing quality can be compared with high-speed wire feeding machines Between the low-speed wire walking machine. Therefore, it can be said that what users call “medium wire cutting” actually means that the reciprocating wire EDM machine borrows the processing technology of some low-speed wire cutting machines, and realizes streak-free cutting and multiple cutting. After several years of development, almost all manufacturers of high-speed wire EDM machine tools in China are producing and selling wire EDM machines, but it is finally shown that not all reciprocating wire EDM machines can perform multiple cuts. In other words, not all reciprocating wire EDM machines can obtain good process effects after using multiple cutting techniques. Multi-cutting is a comprehensive technology, which involves the CNC precision of the machine tool, pulse power supply, process database, wire-feeding system, working fluid and a large number of process issues, not simply adding a set of high-speed wire-feeding machines Only those reciprocating wire EDM wire cutting machines with high manufacturing precision and created multiple cutting conditions in various aspects can perform multiple cutting and streak-free cutting, and obtain remarkable results. craft effect. Therefore, our production enterprises must pay full attention to this problem, must do it according to the system engineering, really make good use of this technology, and make this product well. For example, in order to further improve the accuracy of the machine tool body, some enterprises have used DC or AC servo motors as the drive unit to directly drive the ball screw for the X and Y coordinate worktables, and at the same time adopted a full-closed-loop control with pitch compensation function, which can be used by the CNC system. Compensate and correct the positioning accuracy error of the machine tool. On the premise of ensuring the accuracy, the reduction of #machining accuracy caused by long-term use is reduced, and the service life of the machine tool is extended. The wire feeding system adopts a special (mostly diamond) electrode wire holder to keep the electrode wire relatively stable and reduce the tension change of the electrode wire during processing. In the cooling system, the commonly used extensive cooling method is changed, multi-stage filtration is adopted and key parameters such as dielectric constant are controlled to ensure the smooth progress of finishing. The control software provides an open processing parameter database, and the corresponding processing parameters can be selected according to the texture, thickness, roughness and other conditions of the material. We believe that through our efforts, the multiple cutting technology will be more perfect, and the reciprocating WEDM technology will also be better applied and developed.
After the reciprocating wire EDM adopts multiple cutting technology, although the processing quality has been significantly improved, it still belongs to the category of high-speed wire EDM, and the cutting accuracy and smoothness still have a large gap with the low-speed wire EDM. The gap, and the maintenance of precision and smoothness also need to be further improved. “Medium wire-feeding machine” has the characteristics of simple structure, low cost and less consumption, so it also has room for survival. The implementation standard is still the relevant standard of high-speed wire-feeding machine, so manufacturers should pay attention to the publicity to users , we must seek truth from facts.