The cutting accuracy of low-speed wire cutting mac

2022-06-24
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The cutting accuracy of low-speed WEDM machine tools is improving day by day

low-speed WEDM 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 complex and precise fine workpieces. According to the different running speeds of electrode wires, WEDM machines are usually divided into two categories: one is the slow wire walking (also known as the low-speed wire walking WEDM machine). The electrode wires make low-speed unidirectional movement. Generally, the wire walking speed is less than 0.2m/s, the accuracy reaches 0.001mm, 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 the past, in order to achieve high-quality surface, the number of times of multiple cutting needs to be as high as 7 ~ 9, but now it only needs 3 ~ 4 times

(2) the corner machining technology is constantly optimized and improved. Because the electrode wire lags behind 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); Automatic adjustment of 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 achieved at one time

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

(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 forming. The water temperature cooling device is adopted to make the internal temperature of the machine tool the same as the water temperature and reduce the thermal deformation of the machine tool. ② Linear motor is adopted. High response, precision positioning can achieve 0.1 μ M equivalent control, feeding without vibration and noise, increasing discharge frequency, maintaining stable discharge, cutting ry5 twice μ m。 ③ The thermal inertia of ceramic and polymer artificial granite parts is 25 times greater than that of cast iron to reduce the impact 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 the immersion processing and the change of workpiece weight. ⑤ Immersion machining is adopted to reduce the thermal deformation of the workpiece. ⑥ Motor servo and closed-loop electrode wire tension control 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 tool setting accuracy 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 electric machining machine manufacturers can use 0.02 ~ 0.03mm electrode wire for cutting

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