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Low-speed wire cutting is the use of a continuously moving fine wire (called a wire) as an electrode, and the workpiece is subjected to pulse spark discharge to remove metal and cut. It is mainly used to process a variety of complex and precise workpieces. According to the running speed of the wire, the WEDM machine is usually divided into two categories: one is slow wire (also called low speed wire EDM) The machine tool) is used for low-speed one-way movement. The general wire speed is less than 0.2m/s, the precision is 0.001mm, and the surface quality is close to the grinding level. Cutting precision of low-speed wire cutting machine is increasing. (1) Multiple cutting technology Multiple cutting technology is the fundamental means to improve the precision and surface quality of low-speed wire EDM. It is the scientific integration of design and manufacturing technology, numerical control technology, intelligent technology, pulse power technology, precision transmission and control technology. Generally, the cutting is performed by one cutting, the secondary cutting is used to improve the precision, and the cutting is performed three times or more to improve the surface quality. Originally, in order to achieve a high-quality surface, the number of times of multiple cuts was as high as 7 to 9 times, and now only 3 to 4 times. (2) The corner processing technology is continuously optimized and perfected due to the lag of the wire when cutting the corner, which will cause the corner to collapse. In order to improve the accuracy of corner cutting, the researchers have adopted more dynamic corner processing strategies. Such as: change the wire path; change the processing speed (thin plate); automatically adjust the water pressure; control the processing energy. By adopting a comprehensive corner control strategy, the corner shape error during roughing is reduced by 70%, and the matching accuracy of up to 5 一次 can be cut at a time. (3) The technique of improving the flatness is a technique for improving the straightness of the high-precision finishing circuit, which is considered to be of great significance for the processing of thick parts. (4) More precise machine structure In order to ensure high-precision machining, many technical measures are taken to improve the accuracy of the host: 1 control temperature. The water temperature cooling device is used to make the internal temperature of the machine tool the same as the water temperature, which reduces the thermal deformation of the machine tool. 2 uses a linear motor. High responsiveness, precise positioning can achieve 0.1μm equivalent control, no vibration, no noise, increase the discharge frequency, maintain stable discharge, cut Ry5μm twice. 3 It adopts ceramic and polymer artificial granite parts, and its thermal inertia is 25 times larger than that of cast iron, which reduces the influence of temperature change on cutting precision. 4 The fixed workbench and column moving structure are adopted to increase the weight of the worktable, which is not affected by water immersion processing and workpiece weight change. 5 Immersion processing is used to reduce the thermal deformation of the workpiece. 6 motor servo, closed loop wire tension control. 7 high-precision tool setting: voltage modulation tool power supply. The accuracy of the tool setting can reach ±0.005mm without damaging the workpiece, regardless of wet or dry. (5) Filament cutting In order to carry out micro-finishing of small rounded corners, narrow slits, narrow grooves and fine parts, various manufacturers have made great efforts to carry out research on filament cutting technology. At present, the world's major electric processing machine manufacturers can use 0.02 ~ 0.03mm electrode wire for cutting.