Discussion on the application of mid-line cutting technology in mold processing Wang Quanmin (Dongguan Yucai Vocational Technical School, Dongguan 523420, Guangdong) The specific process flow and problems that should be paid attention to when using the concave mold, and also introduces the common method of correcting the position of the electrode wire. It summarizes the problems that wire cutting technology should pay attention to in mold processing, in order to provide technical theory for the relevant personnel engaged in the mold processing industry. Due to the rapid development of China's machinery manufacturing and processing industry, the mold industry has also developed faster and faster. In particular, in recent years, there have been more and more types of mold parts, more and more complex shapes, and more and more curved parts. Traditional processing techniques and processing equipment have become increasingly difficult to meet the processing requirements of mold parts. The emergence of wire cutting technology has solved this problem well, not only can process complex mold parts, but also ensure the processing precision requirements of mold parts, and greatly shorten the time required for the processing of mold parts. The degree of automation during processing is also relatively high. It is these advantages of wire cutting technology that make wire cutting technology more and more widely used in mold processing. Next, the paper will start from the basic principle of wire cutting technology, and then discuss in detail the specific application of wire cutting technology in mold processing. The basic principle of the 1 line cutting processing technology The line cutting processing is based on the electrochemical knowledge theory. The cutting tools are generally thin metal wires, and the copper wire and molybdenum wire are more commonly used. The principle of achieving the cutting action is that the positive and negative poles of the high-frequency pulse power source are respectively connected to the workpiece and the thin metal wire, and then the thin metal wire uses the pulse voltage supplied by the high-frequency pulse power source to enter the spark discharge, thereby realizing the cutting function. As shown in the figure, there will be a gap between the workpiece and the thin wire, and some specific working fluid will be injected into the gap. Under the energy provided by the high-frequency pulse power supply, the fine wire will continuously reciprocate and enter the spark. The discharge cuts the workpiece, and some products such as chips generated during the cutting process are carried away by the flow of the working fluid. The feed motion of the workpiece during cutting is achieved by the movement of the table in the X-axis and Y-axis directions. The movement of the workbench is controlled by pre-programmed procedures. The above is the basic principle of wire cutting technology. Line cutting processing principle 2 line cutting technology processing technology analysis In the actual processing application of online cutting technology, the main control technical indicators have the following two points, that is, the concave angle and sharp angle of the machined part are in line with the processing conditions of the wire cutting technology. Whether the machining accuracy that the wire cutting technology can achieve when machining parts is matched with the accuracy of the machine tool. 2.1 Concave angle and sharp angle processing technology analysis Wire cutting technology In the actual mold processing process, the movement trajectory of fine metal wire is generally calculated according to the center movement of the wire. However, this calculation method will bring a certain error. The reason why the error occurs is because the wire has a certain diameter of +, and due to the existence of the discharge gap, the machining surface of the workpiece is inevitably present between the wire and the thin wire. A certain gap In order to minimize d, such an error, the above-mentioned gap must be considered in calculating the central motion trajectory of the wire. At the same time, in the actual machining of the online cutting, the concave angle can only be processed into rounded corners, and the error when processing the rounded corner is proportional to the radius of the wire and the large d of the discharge gap. Therefore, when processing convex and concave parts, it is necessary to treat the specific situation. When machining convex parts, the center movement trajectory of the wire should be increased by one/, and the concave part should be correspondingly reduced by + 2 In the actual machining process of determining the radius of the transition circle, how to determine the radius d of the transition circle is a relatively important problem, and the main factors affecting the radius of the transition circle are the following two points, namely the shape of the workpiece and the required processing. Precision. In general, the radius of the transition circle is proportional to the thickness of the workpiece being machined. The clearance when the mold is mated should also increase the transition circle accordingly. At the same time, when reasonably determining the large radius of the transition circle, it should also ensure that the machining accuracy of the part is in accordance with the accuracy of the machine tool. 3 wire position correction method Because the position of the wire is sometimes deviated during the actual machining process of online cutting, the more commonly used wire position correction method will be introduced. 3.1 Visual measurement method When the position of the electrode wire is deviated, the position of the reference line and the electrode wire at the perforation can be directly observed by a visual inspection or a magnifying glass. According to the observation result, the worktable is adjusted accordingly until the reference line and the electrode wire The positions appear coincident, thus completing the alignment of the wire position. 2 Spark method The principle of aligning the position of the wire is to move the table to generate spark discharge from the reference surface of the part and the wire, and quickly record the coordinate value of the table to calculate the center position of the wire. coordinate of. However, this method usually has a certain influence on the reference surface of the part, so it is not commonly used in actual machining. 3.3 Automatic alignment method The principle of this method is to make the wire electrode contact the workpiece through the lateral and longitudinal moving bed saddle, and record the horizontal and vertical coordinate values ​​of the center of the wire. The example of 4-wire cutting processing is now taking the machining of convex and concave mold parts as an example. The machining process of wire cutting technology is briefly introduced. The processed parts are as shown. First determine the diameter of the wire and the large d of the discharge gap. The wire hole is then threaded and the point of entry of the wire is determined. And calculate the intersection coordinates of the silicon valley, determine the central motion trajectory of the wire, and finally write the corresponding program. Precautions for 5-wire cutting processing In order to ensure the machining accuracy and surface roughness of the machined parts, the parts should be quenched before processing. Parts should be treated with a de-oxidized layer on the surface of the part before being processed, and the mold is ground to eliminate residual stress and other defects on the surface of the workpiece, and to extend the use time of the mold. Control the gap between the fine wire and the surface of the workpiece before machining and give an appropriate amount of clearance compensation. 6 Conclusion In summary, with the wire cutting technology in China's mold processing is more and more widely used, and plays an increasingly important role. In order to make better use of wire cutting technology and continuous optimization of wire cutting technology, we must not only master the basic principles of wire cutting technology, but more importantly, we must continuously improve the process, find problems from the process and solve them in time. The problems that occur in the actual processing of online cutting should be carefully analyzed to find out the problem and summarize the experience of the predecessors. At the same time, we must constantly learn the advanced technology experience of the international industry, continuously improve and improve our wire cutting technology and practical operation experience, and win the promotion of mold parts in the increasingly complex mold parts processing market with advanced wire cutting technology and experience. The rapid and stable development of the processing industry. Technical information Electric Heater,Electric Winter Air Heater,Electric Water Heater,Electric Infrared Panel Heater Shandong Dexiang Electrical Technology Co.,Ltd , https://www.heater-kerosene.com
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