The cutting accuracy of the hottest low-speed wire

The cutting accuracy of low-speed wire cutting machine tools is improving day by day

low-speed walking, so many businesses turn to domestic sales in order to obtain supply and demand. Wire cutting uses continuously moving fine metal wires (called electrode wires) as electrodes to etch metal and cut the workpiece by pulse spark discharge. It is mainly used to process various workpieces with complex and precise shapes. According to the running speed of electrode wires, wire EDM machine tools are usually divided into two categories: one is slow wire walking (also known as low-speed wire EDM machine tools). Electrode wires make low-speed unidirectional movement. Generally, the wire walking speed is less than 0.2m/s, the accuracy reaches 0.001mm level, and the surface quality is close to the grinding level

the cutting accuracy of low-speed WEDM machine tools is improving day by day

(1) multiple cutting technology multiple cutting technology is the fundamental means to improve the machining accuracy and surface quality of low-speed WEDM. It is a scientific integration of design and manufacturing technology, numerical control technology, intelligent technology, pulse power supply technology, precision transmission and control technology. Generally, it is formed by one-time cutting, the accuracy is improved by two-time cutting, and the surface quality is improved by more than three times cutting. In order to achieve a high-quality surface, the number of times of multiple cutting needs to be as high as 7 ~ 9 times, but now it only needs 3 ~ 4 times

(2) the corner processing technology is constantly optimized and improved. Due to the lag of electrode wire when cutting corners, the corners will collapse. In order to improve the accuracy of corner cutting, researchers have adopted more dynamic corner processing strategies. For example, change the wire path; Change the processing speed (sheet); Automatically adjust the water pressure; Control processing energy, etc. By adopting a comprehensive corner control strategy, the corner shape error is reduced by 70% during rough machining, and the fitting accuracy of 5 μ M can be cut at one time

(3) adopt the technology of improving flatness. High precision finishing circuits are all technologies of improving flatness, which are considered to be of great significance for thick workpiece processing

(4) the structure of the machine tool is more precise. In order to ensure high-precision processing, many technical measures are adopted to improve the accuracy of the host machine: ① the 3D printing technology of SLA controls the temperature of printing and molding. Using the water temperature cooling device, the internal temperature of the machine tool is the same as the water temperature, and the thermal deformation of the machine tool is reduced. ② Adopt linear motor. High responsiveness, precision positioning can achieve 0.1 μ M equivalent control, feed without vibration and noise, improve discharge frequency, maintain stable discharge, and cut ry5 twice μ m。 ③ The thermal inertia of ceramic and polymer artificial granite parts is 25 times larger than that of cast iron, which reduces the influence of temperature change on cutting accuracy. ④ The fixed worktable and column moving structure are adopted to improve the bearing capacity of the worktable, which is not affected by soaking processing and workpiece weight changes. ⑤ Immersion machining is adopted to reduce the thermal deformation of the workpiece. ⑥ Motor servo and closed-loop electrode wire tension control are used to promote the research, development and utilization of new technologies, processes and products of non-ferrous alloy materials in China. ⑦ High precision tool setting: voltage modulation tool setting power supply is adopted. The accuracy of tool setting can reach ± 0.005mm, without damaging the workpiece, whether dry or wet

(5) filament cutting in order to carry out the micro finishing of small fillets, narrow slots, narrow grooves and micro parts, all manufacturing enterprises have made great efforts to study the filament cutting technology. At present, the world's major manufacturing enterprises of electric machining machines can use 0.02 ~ 0.03mm electrode wire for cutting