Accuracy of CNC cutting technology

The introduction of CNC cutting technology precision 1. Multiple cutting technology multi 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 technology, precision transmission and control technology. Generally, through one-time cutting forming, secondary cutting to improve the accuracy, more than three times to improve the surface quality. In order to achieve high-quality surface, the number of times of cutting is as high as 7-9 times, but now it only needs 3-4 times. 2. The corner processing technology is constantly optimized and improved. Because of the lag of the electrode wire when cutting the corner, the corner will collapse. In order to improve the accuracy of corner cutting, researchers have adopted more dynamic corner processing strategies. Such as: change the wire path; change the processing speed (sheet); automatic adjustment of water pressure; control of processing energy. By using the integrated corner control strategy, the corner shape error can be reduced by 70% and the matching accuracy of 5 μ M can be achieved at one time. 3. High speed CNC adopts the technology of improving flatness. High precision finishing circuit is the technology of improving flatness, which is considered to be of great significance to thick workpiece processing. 4. The structure of the machine tool is more precise. In order to ensure high-precision machining, many technical measures are adopted to improve the accuracy of the host machine: ① control the temperature. Using water temperature cooling device, the temperature inside the machine tool is the same as the water temperature, and the thermal deformation of the machine tool is reduced. ② Linear motor is adopted. High response, precision positioning can achieve 0.1 μ m equivalent control, feed no vibration, no noise, improve discharge frequency, maintain stable discharge, twice cut ry5 μ M. ③ The thermal inertia of ceramic and polymer artificial granite is 25 times larger than that of cast iron, which reduces the influence of temperature change on cutting accuracy. ④ Fixed worktable and column moving structure are adopted to improve the bearing capacity of worktable, which is not affected by immersion processing and workpiece weight change. ⑤ Immersion machining is used to reduce the thermal deformation of the workpiece. ⑥ Motor servo, closed loop wire tension control. ⑦ High precision tool setting: using voltage modulation tool setting power supply. The tool setting accuracy can reach ± 0.005mm without damaging the workpiece, whether dry or wet. 5. In order to carry out the micro precision machining of small fillet, narrow slot, narrow slot and micro parts, high-speed CNC wire cutting technology is researched by many manufacturers. At present, the main manufacturing enterprises of EDM in the world can use 0.02-0.03mm electrode wire for cutting. Precision surface grinder is a common machine tool for machining. There are high requirements for the motion stability, commutation accuracy and commutation frequency. At present, the surface grinding machine is developing towards large-scale and high-speed, and the reciprocating speed of some surface grinding machines has reached 40% n []. Large high-speed surface grinder has a large inertia. When it changes direction, it will lead to a sharp rise in back pressure, resulting in reversing impact, which will have a disastrous impact on the machine tool. Therefore, the stability of reversing has become an important factor restricting the improvement of the working speed and machining accuracy of the grinder. The reversing mode and reversing control parameters in the system play a decisive role in reversing impact. The surface grinder adopts hydraulic transmission. It is urgent to design a new hydraulic reversing system. In this paper, the reversing impact of grinder is discussed from the perspective of commutation method and control strategy. 1. The mechanism of reversing impact is that in its hydraulic system, when the hydraulic transmission surface grinder changes direction. The valve port of the directional valve is closed instantaneously, and the oil circuit is suddenly disconnected, which makes the oil in the oil return chamber unable to drain. The larger m and V, we can see. The greater the kinetic energy, the greater the reversing impact. For the surface grinder with large inertia and high speed, its reversing impact is huge, which not only affects the machining accuracy of the machine tool, but also hinders the normal operation and service life. 1. Product analysis through product analysis should obtain certain composition information and some specific processing requirements. 2. Graphic design graphic design the graphic design should be based on the detailed analysis of the product, determine the type of graphics by analyzing the processing requirements, and draw through the graphics software. 3. Process planning is based on the analysis of the appearance and processing requirements of the workpiece products in the early stage, so as to reasonably establish each processing step from the overall processing situation. 4. In fact, the process of path generation is to realize the process planning through software, and optimize the tool path by setting parameters. 5. After the path simulation path is generated, we generally have no intuitive sense of its final performance on the machine tool. Here we can check the possible problems through path simulation, thus reducing the actual processing scrap rate. The general inspection focuses on the effect of workpiece appearance, whether it is overcut or undercut, and whether the process planning of the path is reasonable. 6. Path output path output is a necessary step for software design and programming to realize on the machine tool. Through the path output, the relationship between the two can be established by the intermediate reference. If you have a professional background in CNC, it can also be understood as the post-processing of tool path.