[Patent Abstract] Laser-flame composite cutting method, which relates to a cutting method that integrates laser heat source and flame heat source, and belongs to metal thermal cutting [Technical field]]. The invention is to solve the technical problems of flame cutting, low efficiency of thick steel, large deformation, easy melting and collapse on the upper side of the cut seam, and easy formation of hanging slag on the lower side. This method is as follows: the steel plate is fixed on the worktable, the use of laser and flame coaxial or non-coaxial composite high-speed cutting steel plate, that is, the completion of laser-flame composite cutting. The slitting obtained by the method of the present invention has good verticality, high cutting surface quality, large cutting thickness, and no need to regularly replace expensive hafnium electrodes; the method of the present invention has fast cutting speed, high cutting efficiency, small heat-affected zone, and deformation Small, because the laser has the function of punching, there is no need to rotate holes on the steel plate in advance, and the cutting process is directly started without preheating. The present invention is in the field of cutting steel. [patent description] laser-flame composite cutting method [technical field] [0001] the present invention relates to a cutting method integrating laser heat source and flame heat source, which belongs to the [technical field] of metal thermal cutting]. [Background] [0002] At present, the most widely used metal thermal cutting methods in the industrial field are flame cutting, plasma cutting and laser cutting. [0003] The flame cutting method has better cutting ability to cut large thickness carbon steel, and its cutting cost is also relatively low. It can be widely used in the cutting of carbon steel and large thickness plates, but it does not have advantages in cutting thin plates. The disadvantages of flame cutting method are low cutting efficiency, wide heat affected zone, large cutting deformation, which affects the cutting accuracy. When flame cutting thick plates, only low carbon steel and low alloy steel can be cut. The upper edge of the cutting seam is easy to melt and collapse, and the lower edge is easy to form hanging slag. Moreover, the preheating process is required to start cutting. The thicker the steel plate, the longer the preheating time, and the lower the cutting speed. These problems cause the overall cutting efficiency to be low. [0004] The plasma cutting method has the advantages of high energy density, small cutting deformation, no need for preheating before cutting, and a wide range of metal cutting. At the same time, the plasma cutting method also has some inherent shortcomings, such as the slope of the cutting edge, the surface quality of the plate is reduced, the plasma cutting process will produce huge noise, a large amount of smoke and dust, which not only produces large noise pollution to the surrounding environment, but also damages the health of the operator and the surrounding personnel. The biggest problem of this cutting method is the consumption of electrodes and nozzles, especially the life of the electrodes is only a few hours, which significantly increases the production cost and reduces the cutting efficiency. [0005] The laser cutting method has many advantages, such as narrow kerf, which can improve the dimensional accuracy of parts and material utilization rate, and can realize high-precision cutting. The cutting quality is good, there is no slag, the edge is vertical and the surface is smooth, which can reduce the subsequent workload after cutting. Fast cutting speed, short perforation time, no need to preheat to start the cutting process, high production efficiency; High energy density, small cutting heat affected zone, it does not destroy the material properties of the cutting plate and can meet the high requirements for the performance of the plate; a wide range of cutting materials, can cut metals, non-metals, etc., can process materials of any hardness, and even can cut transparent glass, etc. At the same time, the laser cutting method also has some shortcomings, such as the high investment cost of disposable equipment, the use and maintenance cost and energy consumption is 1.5 times that of the same plasma cutting equipment, etc. The most critical point is limited by the laser power. The laser cutting method is currently only applicable to the cutting field of thin plates below 30mm, and cannot be popularized and applied in the field of thick plates.

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