Control of cutting quality of CNC plasma cutting machine
Metal Cutting Lu CNC Plasma Cutting Machine Cutting Quality Control Nie Suhua, Ma Shengrong, Li Heng, Wang Yufeng (Nanhua University Network and Modern Education Technology Center, Hengyang, Hunan 421001) and the quality of cutting. According to the characteristics of the CNC cutting machine, combined with the test data for analysis and summary, the optimal cutting parameters of different thickness cutting steel plates with different powers are obtained. To improve the cutting quality of CNC plasma cutting machine. CNC plasma cutting machine is an electromechanical integration advanced equipment for metal sheet cutting. It has been widely used in shipbuilding, machinery manufacturing and other industries. There are many factors affecting the cutting quality of CNC plasma cutting machine. In addition to the design parameters of the cutting machine, it is also related to the operation control and cutting process. In order to improve the cutting quality, we carried out a comprehensive cutting test, and analyzed and sorted according to the test data, and obtained some optimal working parameters of the CNC plasma cutting machine. Now described as follows: 1 CNC plasma cutting characteristics and quality evaluation CNC plasma cutting machine can cut a variety of complex shapes of the workpiece, and has a high cutting speed, high efficiency, good cutting surface quality, accurate cutting dimensions, small thermal deformation of the workpiece, etc. advantage. The cut parts can be directly welded and applied without machining. However, the CNC plasma cutting machine cuts with a plasma arc. Compared with oxygen cutting, it still has certain defects, mainly reflected in the large inclination of the cutting surface, and the smoothness is not good for oxygen cutting. The main criteria for evaluating the quality of CNC plasma cutting are: the inclination of the cutting surface, the depth of the slitting of the slit, and the amount of slag. A high-quality cutting surface should have a slope of 3 or less, a kerf depth of 0.15 mm or less, and less slag and easy removal. Under the condition of stable voltage and current, the factors affecting the cutting quality, in addition to the quality of the electrode and the nozzle itself, mainly have two reasons: one is the height and stability of the cutting nozzle; the other is the matching of the cutting speed and the working pressure. When the cutting nozzle is controlled by the arc pressure height adjuster, the dynamic positioning accuracy can reach 0.013mm, so the height of the cutting nozzle and the steel plate can be kept unchanged, so the inclination of the cutting surface is small and uniform. And the finish is good. When manually adjusting the height of the cutting nozzle from the steel plate, the steel plate to be cut should be leveled as much as possible to reduce the number of adjustments of the torch and ensure the stability during the cutting process of the torch. In this paper, the height of the cutting nozzle from the steel plate is controlled at 68mm by manual adjustment. Through a series of cutting tests, the relationship between cutting speed (v), working pressure (P) and cutting quality is explained. 2 Test method The test equipment is one of four different air plasma cutting machines of Nanhua University Blu-ray Electromechanical Equipment Co., Ltd., each with 6 sets of electrodes and nozzles. The torches of the four air plasma cutting machines are mounted on the cutting cart of the CNC cutting machine in order. Each type of air plasma cutting machine has to complete the entire process of all tests separately, that is, using different cutting speeds and using different air pressures to cut A3 steel plates of different thicknesses (cooled with tap water). Cutting is performed from low pressure to high pressure, and from low speed to high speed. The air pressure is regulated by a filter control valve and the cutting speed is controlled by a CNC cutter. The cutting parts are square parts of 100mm>400mm. 3 Test results and analysis The test results of cutting two different thickness steel plates of 6 mm and 10 mm by LG-100K air plasma cutting machine are shown in Table 1. Due to the large amount of test data, the test data for cutting other thickness steel plates with this machine, as well as the test data for cutting with LG-120KLG-160K and LG-200K machines, are not listed one by one, and will be expressed graphically below. come out. Table 1 LG-100K air plasma cutting machine cutting test results steel plate thickness / mm working pressure / MPa project name cutting speed / mmin-1 inclination / (° finish Rz inclination / (° finish Rz inclination / (° finish Rz Tiltness / (° Finish Rz Tilt / (° Finish Rz Tilt / (° Finish Rz Tilt / (° Finish Rz Tilt / (° Finish Rz Tilt / (° Finish Rz Tilt / (° Finish Rz from The results in Table 1 show that when the cutting speed is too high and the air pressure is too low, the inclination of the cutting surface is large. This is because the speed is too fast, the arc column is seriously inclined backward, and the melting speed of the lower half of the slit cannot keep up. The size of the cut part is small, and the size of the lower plane is large. Especially when cutting a right-angled part, the bottom at the corner is slit into a circular arc instead of a right angle. If the cutting speed is too low and the air pressure is too high, the slag is slag. Severe, difficult to remove, poor finish. If the cutting speed is right, the working pressure is too high, the stiffness and smoothness of the arc column are damaged, the cutting ability is reduced, and the cutting smoothness is poor. Therefore, it is necessary to cut the steel plates of different thicknesses reasonably. Choose different cutting power, cutting speed and working pressure, in order to get the best cutting results. It can also be seen from the data in Table 1 that different steel plate thicknesses have different optimum cutting speeds and working pressures. Based on the test data of four different models, we analyzed the best cutting speed and working pressure parameters of different thickness steel plates with different power plasma cutters, as shown. According to the test results of four different power models, the optimal cutting parameters of different power cutting machines for cutting different thickness steel plates are shown in Table 2. According to these data, we have actually applied cutting in some manufacturers, the effect is very good, and the cutting quality is greatly improved. Cutting steel plate thickness / mm model 4 Conclusion We know that there are many factors affecting the cutting quality of CNC plasma cutting machine, in addition to the above mentioned parameters, there are many factors such as cutting process, cutting method, electrode nozzle good and so on. . However, in the actual cutting process, as long as the cutting according to the best cutting parameters provided above, cutting speed, working pressure and the height of the cutting torch can meet the cutting quality requirements. In the case of stable cutting voltage and cutting current, the service life of the electrode and nozzle can be doubled. Steel Flange,Stainless Steel Flange,Carbon Steel Flanges, Pipe Fitting Flange Cangzhou Youlong Pipe Fitting Manufacturing Co., LTD , https://www.ypco88.com