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People often ignore small details when using a cutting machine, and these small details are the key elements in the cutting of items. Here are three basic elements that explain the flame cutting quality of the steel plate.
1. gas:
Oxygen Oxygen is necessary for the combustion of flammable gases in order to provide the required energy for the ignition temperature of the steel; in addition, oxygen is necessary for the steel to be burned after it is preheated to reach the ignition point. The oxygen used for cutting steel must have a high purity, and the general requirements are above 99.5%. The industrial standards of some advanced countries require the purity of oxygen to be above 99.7%. Each 0.5% reduction in oxygen purity reduces the cutting speed of the steel plate by about 10%. If the oxygen purity is reduced by 0.8%-1%, not only the cutting speed is reduced by 15%-20%, but also the kerf is widened. The slag at the lower end of the incision is more difficult to clean and the quality of the cut section is also significantly deteriorated. Gas consumption Also with the increase. Obviously, this reduces production efficiency and cutting quality, and production costs also increase significantly. The use of liquid oxygen cutting, although one-time investment, but in the long run, its comprehensive economic indicators is much better than imagined. The stability of the gas pressure is also crucial for the quality of the workpiece. The fluctuating oxygen pressure will significantly deteriorate the quality of the cut section. The air pressure is adjusted according to the nozzle type used and the thickness of the steel plate being cut. If oxygen pressure exceeding the specified value is used during cutting, the cutting speed cannot be increased, but the quality of the cutting section is reduced, and the dross is hard to be cleaned, which increases the processing time and cost after cutting.
2. Cutting speed The cutting speed of a steel plate corresponds to the burning speed of steel in oxygen. In actual production, the cutting speed should be adjusted according to the performance parameters of the cutting tip used, the type and purity of the gas, the material and the thickness of the steel plate. The cutting speed directly affects the stability of the cutting process and the quality of the cutting section. If one wants to artificially increase the cutting speed to increase the production efficiency and use the slower cutting speed to optimally improve the quality of the cutting section, this cannot be done and only the quality of the cutting section will be deteriorated. Too fast cutting speed will cause defects such as sag and slag on the cutting section, which may cause severe interruption of cutting. If the cutting speed is too slow, the upper edge of the cutting edge will melt and collapse, the lower edge will be rounded, and the lower section will be cut. Some of the deep-water pit pits and the like appear.
3. Cutting nozzle and the height of the cut surface of the workpiece In the flame cutting process of the steel plate, the height from the cutting nozzle to the cut working surface is one of the main factors that determine the quality of the cut and the cutting speed. For steel plates of different thicknesses, cutting nozzles with different parameters should be adjusted accordingly. In order to ensure a high-quality cut, the height of the cutting tip to the surface of the cut piece must remain essentially the same throughout the cut.
Editing: kunshanwl
