It is worth noting that with the popularization of the past few years, almost all the domestic production of high speed WEDM machine manufacturers are wire in production and sales, but in the end that wire walking not all reciprocating cutting machine can cut many times, or that not all fro wire EDM machine adopts multiple cutting technology can obtain good effect of technology. Multiple cutting is a comprehensive technology, it relates to the CNC machine tool precision, pulse power, process database, wire system, working fluid and a large number of technical problems, and not simply in the high speed wire machine and a wire frequency control system can be realized, only those with high manufacturing precision in the aspects of creating, and repeatedly cutting conditions of WEDM machine to multiple cutting and non cutting process and get stripe, significant effect. Therefore, our production enterprises must pay enough attention to this problem. We must do it according to system engineering, and really use this technology to make this product well. As for some enterprises to further improve the accuracy of the machine tool body, X, Y coordinate table adopts DC or AC servo motor as driving unit directly drives the ball screw, the whole closed-loop control with pitch compensation function, can compensate and correct the NC system of the machine tool positioning accuracy error. On the premise of guaranteeing the precision, the machining precision is reduced and the service life of the machine is prolonged. A special (most diamond) wire holder is used to maintain the relative stability of electrode wire and reduce the tension of electrode wire during processing. In the aspect of cooling system, the commonly used extensive cooling methods are changed. Multi-stage filtration is adopted and key parameters such as dielectric constant are controlled to ensure the smooth operation of finishing. The control software provides an open processing parameter database, which can select the corresponding processing parameters according to the material texture, thickness, roughness and other conditions. I believe that after our efforts, multiple cutting technology will be more perfect. The technology of reciprocating wire and WEDM will also be better applied and developed.

30 degrees in wire cutting it is mainly used to process a variety of complex and fine fine pieces of work, such as die punch, concave die. It is developed on the basis of the perforation and forming of electric spark. It not only makes the application of EDM development, but also has replaced the electric spark perforation and forming process in some aspects. Wire cutting machine tools have accounted for more than half of the electric spark machine.

 

The working principle of the middle silk thread cutting is that the electrode wire on the wire feeding cylinder moves at a certain speed along the slewing direction of the wire conveying cylinder, and the workpiece mounted on the machine tool worktable is made by the worktable according to the predetermined control trajectory, and relative to the electrode wire to form the movement. One pole connection of the pulse power supply and the other electrode wire. There is always a certain discharge gap between the workpiece and the electrode wire, and the working fluid is sprayed. The spark discharge between the electrodes will cause certain gaps, and the continuous pulse discharge will cut out the workpiece with the required shape and size. Go out wire technique here, "wire" than the WEDM WEDM machining quality is increased significantly, but it still belongs to high speed WEDM machine category, cutting precision and smoothness and low speed wire machine there is a big gap, and the precision and smoothness of the retention is also need to be further improved. "Walking wire machine" has the characteristics of simple structure, low cost and less consumption. Therefore, it has its own survival space. The standard of execution is still the relevant standard of high-speed wire feeder. Therefore, producers should pay attention to users' propaganda and be practical and realistic.

 

In the 5 processing conditions, the wire cutting process can operate normally, and the following conditions must be provided in the technology of middle wire.

 

1. the gap between the machined surface of the molybdenum wire and the workpiece must be maintained, and the width of the gap depends on the working conditions such as the working voltage and the processing quantity.

 

2. it is required to teach high insulation to produce impulse spark discharge. Liquid medium also eliminates the effect of corrosion products and cooling electrodes in the gap. There is a certain gap between molybdenum wire and workpiece surface. If the gap is too large, the voltage between the poles can not penetrate the polar dielectric, then no spark discharge can be generated. If the gap is too small, it will easily form short circuit connection or spark discharge.

 

3. the pulse power must be used, that is, the spark discharge must be impulsive and intermittent. In Figure 1, Ti is pulse width, to is pulse interval, and TP is pulse period. In the pulse interval, the gap medium eliminates ionization, so that the next pulse can break through between the two poles.

 

6 some related matters in working environment of wire cutting machine tool in working environment

 

1. choose a place without dust, to avoid a large number of channels on the side of the cutting online;

 

(1) the characteristics of the wire cutting discharge machine, the presence of dust in the air, will cause the machine's wire rod to be seriously worn, thus affecting the service life.

 

(2) the wire cutting discharge machine is a computer control. The disk used by the computer is very strict for the dust in the air. When the dust enters the disk, the disk will be damaged, and the hard disk will also be damaged.

 

(3) the wire cutting motor itself emits a lot of heat, so it is necessary to exchange air frequently in the electrical cabinet. If there is too much dust in the air, it will be attached to each electrical component during the process of gas exchange, resulting in poor heat dissipation of the electrical components, resulting in the burn out of the circuit board. As a result, the dustproof net of the machine should be regularly cleaned.

 

2. choose the place that can bear the weight of the machine tool.

 

3. no vibration and impact of incoming places, WEDM machine is a high precision processing equipment, if placed where there is vibration and shock, will cause serious damage to the machine, which seriously affects the machining accuracy, shorten its service life, and even lead to scrap machine.

 

4. to meet the space size required by the wire cutting machine.

 

5. select the place where the temperature is small, and avoid the direct sunlight through the window and the window glass and the place near the heat flow.

 

(1) high precision parts are processed at a constant temperature, usually at room temperature 20C;

 

(2) there is a considerable amount of heat generated by the wire cutting machine itself when it works. If the temperature changes too much, it will have a serious impact on the service life of the machine.

 

6., choose shielded house: because the wire cutting electrical discharge machining process belongs to the arc discharge process, during the arc discharge, there will be strong electromagnetic waves, which will cause harm to human health, and will also affect the surrounding environment.

 

7. choose a well ventilated, spacious plant so that the operator and machine tools can work in the best environment.

 

Other notices for wire cutting:

 

1. the gap between the machined surface of the molybdenum wire and the workpiece must be maintained, and the width of the gap depends on the working conditions such as the working voltage and the processing quantity.

 

2. the high insulation is required to facilitate the spark discharge generated by the impulse, and the voltage between the poles can not break through the interpolar medium.

 

3. the pulse power must be used, that is, the spark discharge must be impulsive and intermittent. The Ti is pulse width, to is pulse interval, and TP is the pulse period. In the pulse interval, the gap medium eliminates ionization, so that the next pulse can break through between the two poles.