CNC flame cutting machine section trace processing method - Database & Sql Blog Articles

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The CNC flame cutting machine is the most commonly used equipment for cutting steel plates. It saves materials and can cut thick steel plates up to 200mm. However, the flame cutting machine also has certain deficiencies when cutting the plate. When the user uses the numerical control flame cutting machine for the numerical control flame cutting control, the metal after the actual cutting is affected by the use of the flame cutting metal type and the thermal deformation of the metal material. There is often a deep mark on the head of the material billet. This trace is the trace of the section we usually say.
According to experience, in order to improve the cutting quality of CNC flame cutting machine, there are the following suggestions and suggestions:
1. For steel plates with a thickness of 30mm or more, the cutting speed is only 20% to 60% of the standard. When the liquid oxygen is cut with a purity of more than 99.5%, the quality of the cut surface is obviously improved due to the pressure stability, and the slag is rarely slag, and the cutting speed is greatly improved.
1.1 When the bottled acetylene is used for centralized gas supply, because of its high purity and stable pressure, discontinuous cutting phenomenon no longer occurs.
Improving the quality of oxygen and acetylene is the fundamental guarantee for obtaining high quality cut surfaces. When using the bottled oxygen with 99% content and the acetylene produced in the acetylene generator for CNC flame cutting, the quality of the cut surface is low, which is characterized by rough surface, which often causes melting of the upper edge of the slit and severe slag and discontinuous cutting. .
1.2 In addition, the rust on the surface of the steel plate and the smooth flow of the cutting nozzle also have a great influence on the continuous cutting. For this reason, the steel plates entering the factory should not be stacked in the open air, and shot blasting should be carried out before cutting. Use the cutting tip correctly and clean it regularly.
1.3 For steel plates from 6mm to 30mm thick, the cutting speed can only reach 60%~90% of the standard. In the process of cutting the thick plate, the method of increasing the oxygen pressure is adopted (the increasing pressure is 0.1 MPa to 0.3 MPa, which ensures the smooth cutting of the thick plate and the perpendicularity of the cut surface, and improves the quality of the cut surface to some extent.
2. In general, under the same plate thickness conditions, parts with large outer dimensions are less deformed than parts with smaller outer dimensions. A part with a small aspect ratio has a smaller deformation than a part with a large aspect ratio; a part placed near the middle of the steel plate has a smaller deformation deformation than a part at the edge.
2.1 Measures to reduce the deformation of the cutting severe cutting deformation will make the size of the parts too poor, affecting the subsequent order to the welding, and even cause scrapping. Therefore, in order to reduce the cutting deformation and improve the dimensional accuracy of the cut parts, the following measures are taken. Choose a reasonable cutting sequence, cutting direction and cutting starting point during programming. When carrying out multi-part sleeve cutting and cutting, the principle of “cut small parts first, then cut large parts; cut holes first, then cut shape” should be followed. When cutting, the cutting deformation trend of the part should be analyzed according to the shape of the part and the position discharged on the steel plate to determine a reasonable starting point and cutting direction.
2.2 Therefore, during the cutting process, the last cut edge of the part should be connected to the steel plate which is not easily displaced. For some narrow strip-shaped parts with large length and width, the deformation can not be effectively controlled only when considering the cutting order, and the intermittent cutting method needs to be considered. That is, two or more temporary cutting points are set on the same side of the cutting part of the part. These points are connected to the steel plate as a whole during the cutting process, and after cutting the other parts, the points are cut. This can reduce the shrinkage deformation of the part in the length direction.