Free positive ions and electromechanical "target=_blank> machine wire with copper wire as the tool electrode, generally unidirectional movement at a speed of less than 0.2m / s, in copper wire and copper, steel or super hard alloy and other processed objects A pulse voltage of 60~300V is applied between the materials, and a gap of 5~50um is maintained. The gap is filled with insulating medium such as deionized water (close to distilled water), causing spark discharge between the electrode and the workpiece, and being consumed and corroded by each other. Electrolytic etching of numerous small pits on the surface of the workpiece, through the NC control monitoring and control, the servo mechanism performs, so that the discharge phenomenon is uniform, so that the processed object is processed to meet the required size and shape. Accuracy of the product. The current precision can reach 0.001mm level, the surface quality is also close to the grinding level. The electrode wire is no longer used after discharge, and the non-resistance anti-electrolysis power supply is used, generally with automatic threading and constant tension device. Uniform, small jitter, high processing precision, good surface quality, but it is not suitable for processing large thickness workpieces. Due to the precise structure of the machine tool, high technical content and high machine price, the cost of use Also high.
In the early days, the one-way wire EDM machine was only an organic species of foreign companies. Although Taiwan's low-speed wire-cut EDM wire cutting machine started late, it has developed rapidly in recent years. One of the key measures is to jointly fund a number of home appliance processing machine tool manufacturers. With the limited support of relevant departments, the Taiwan Industrial Technology Research Institute has invested a large amount of manpower and material resources to develop key technologies. After more than 10 years of research, it has made breakthroughs in key technologies such as control systems and power supplies. The low-speed wire-cut EDM wire-cutting machine manufactured by various enterprises in Taiwan should be in the range of mid-range machines. It has reached a growth rate of 20% to 30% every year for the past three years. It is estimated that in the next five years, Taiwan’s low-speed wire-cut EDM wire cutting machine The annual output can reach 2,000 units, which can account for more than 25% of the world market. The low-speed wire-cut EDM wire cutter has high technical content and good market prospects, and can obtain a high return. It is a “strategic place†and a “strategic highland†for various manufacturers in the electric processing industry. It can also be said that whoever masters the technology of the low-speed wire-cut EDM wire-cutting machine will have the opportunity to develop and grow in the next step. In order to seize the Chinese market, electric processing machine tool manufacturers in Japan, Switzerland and Taiwan set up factories in mainland China to produce such machine tools. With the support of the special fund of the Ministry of Science and Technology, China's science and technology workers have invested a large amount of research and development, and have completed the research and development of a new generation of low-speed wire-cut EDM wire-cutting machines, and have made major breakthroughs. The product, and occupied a certain market share, its performance indicators can reach the mid-range machine level. At present, some domestic companies hope to develop low-speed wire EDM wire cutting processing technology through cooperation with related companies in Taiwan.
Vertical self-rotating electric discharge wire cutting machine
Vertical self-rotating electric discharge wire cutting machine (horizontal self-rotating electric discharge wire cutting machine). The characteristics of the vertical rotary electric discharge wire cutting machine are different from the traditional high-speed wire-cutting and low-speed wire-cut wire EDM. First, the wire movement mode is one electrode more than the traditional two-wire wire-cutting process. The rotary motion of the wire; secondly, the wire speed of the wire is directly between the high speed wire and the low speed wire, and the speed is 1 to 2 m/s. Due to the increased rotational movement of the wire during processing, the biggest difference between a vertical rotary wire EDM machine and other types of wire cutters is the wire-traveling system. The wire-traveling system of the vertical rotary electric discharge wire cutting machine has two sets of the same two ends of the wire-cutting end and the wire-discharging end as the wire-trailing structure, realizing the high-speed rotary motion of the wire and the composite movement of the low-speed wire. The area between the two sets of spindle heads is the effective machining area. Except for the wire-traveling system, the other components of the machine are the same as the high-speed wire-cutting machine.
Compared with the one-way low-speed wire-cut EDM machine, the reciprocating high-speed wire EDM machine has a large gap in the key technical indicators such as average productivity, cutting accuracy and surface roughness. In response to these gaps, at the beginning of this century, several high-speed reciprocating wire EDM machines in China achieved multiple cutting operations on high-speed wire-cutting machines (this type of machine tool is commonly known as “medium wire†Medium Speed ​​Wire cut Electrical Discharge Machining). The so-called "medium wire" does not mean that the wire speed is between high speed and low speed, but a composite wire cutting machine. The wire routing principle is to use 8-12m/s high speed wire for roughing and fine machining. 1-3m/s low-speed wire, so the work is relatively stable, the jitter is small, and the error caused by material deformation and molybdenum wire loss is reduced by multiple cutting, so that the processing quality is relatively improved, and the processing quality can be between the high-speed wire-cutting machine. Between the low speed wire machine. Therefore, it can be said that the user said "medium wire", in fact, the reciprocating wire EDM wire cutting machine borrowed from the processing technology of some low-speed wire-cutting machines, and realized the stripless cutting and multiple cutting.
After several years of development, almost all domestic manufacturers of high-speed wire-cut EDM wire-cutting machines are in the process of production and sales, but it turns out that not all reciprocating wire EDM machines can cut many times. Or not all reciprocating wire EDM machines can achieve good process results after multiple cutting techniques. Multiple cutting is a comprehensive technology, which involves the numerical control precision of the machine tool, pulse power supply, process database, wire routing system, working fluid and a large number of process problems. It is not simply adding a set of high speed wire machine. The wire frequency conversion speed control system can be realized, only those reciprocating wire EDM machines with high manufacturing precision and multiple cutting conditions in various aspects can perform multiple cutting and stripeless cutting, and obtain remarkable Process effect. Therefore, our production enterprises must pay full attention to this problem, we must do it according to system engineering, and really use this technology well to make this product a good one. For example, in order to further improve the accuracy of the machine body, the X and Y coordinate worktables use a DC or AC servo motor as the drive unit to directly drive the ball screw. At the same time, the full-closed control with pitch compensation function is used, and the CNC can be used. The system compensates and corrects the positioning accuracy error of the machine tool. Under the premise of ensuring accuracy, the machining accuracy caused by long-term use is reduced, and the service life of the machine tool is prolonged. The wire system uses a special (mostly diamond) wire retainer to keep the wire filament relatively stable and reduce the tension change of the wire during processing. In the cooling system, the commonly used extensive cooling method is changed, and multi-stage filtration is adopted to control key parameters such as dielectric constant to ensure smooth finishing. The control software provides an open database of processing parameters, which can be selected according to the material's texture, thickness, roughness and other conditions. It is believed that through our efforts, the cutting technology will be more perfect, and the reciprocating wire EDM technology will also be better applied and developed.
After the reciprocating wire EDM wire cutting machine adopts multiple cutting technology, although the processing quality is obviously improved, it still belongs to the category of high-speed wire EDM wire cutting machine. The cutting precision and smoothness still exist with the low speed wire cutting machine. The gap, and the retention of precision and finish, also needs to be further improved. The “medium wire machine†has the characteristics of simple structure, low cost and low consumption. Therefore, it also has room for survival. The current implementation standard is still the relevant standard of high-speed wire-cutting machine. Therefore, the production enterprise should Be careful, be sure to seek truth from facts.
Wire EDM
Distinguish between fast-cut wire cutting, medium-cut wire cutting, and slow wire cutting.
1: The wire cutting speed of the fast wire EDM wire cutting is 6~12 m/s, and the electrode wire is used for high-speed reciprocating motion, and the cutting precision is poor.
2: Medium wire EDM wire cutting is a new process of frequency conversion and multiple cutting on the basis of fast wire cutting.
3: The wire speed of the slow wire EDM wire cutting is 0.2m/s, and the wire wire is made in a low speed one-way motion with high cutting precision.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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