Solving the effect of oxygen pressure on cutting quality of CNC flame cutting machine

In gas flame cutting, oxygen flow rate plays a crucial role in determining both the cutting speed and quality. For instance, when cutting a steel plate that is 12 mm thick, increasing the oxygen flow rate leads to a gradual rise in cutting speed and improved cutting quality. However, beyond a certain threshold, the performance starts to decline. This indicates that for each thickness of steel, there exists an optimal oxygen flow rate that maximizes efficiency and quality. The gas flow rate in a CNC flame cutting machine is primarily determined by the thickness of the material being cut. A fixed gas supply can significantly affect the overall cutting speed depending on the material’s thickness. Conversely, if the flow rate is kept constant, different cutting speeds can be achieved, resulting in varying penetration depths. It's important to note that for a single material thickness, increasing the oxygen flow rate within reasonable limits can enhance the final cutting result. However, exceeding this limit will lead to a decrease in quality. Therefore, finding the ideal oxygen flow rate for each specific material thickness is essential for achieving the best possible outcome. Numerous factors influence the gas flame cutting process, with the cutting oxygen flow being one of the most critical elements. The oxygen stream must not only support the combustion of the metal but also effectively blow away the molten oxides from the cut. As a result, various parameters related to the oxygen flow have a significant impact on both the cutting speed and the overall quality of the cut. In this context, the cutting effect of oxygen pressure on the final result has been briefly analyzed. As the cutting oxygen pressure increases, so does the oxygen flow rate, allowing for the cutting of thicker materials. However, after reaching a certain pressure level, the maximum thickness that can be cut remains constant, and further increases in pressure may actually reduce the thickness that can be cut. The impact of oxygen pressure on cutting speed follows a similar pattern to that of oxygen flow rate. When using a diffusion nozzle, if the oxygen pressure matches the design specifications of the nozzle, the cutting speed increases as the flow and momentum of the oxygen increase with higher pressure. Under normal conditions, when a CNC cutting machine uses a standard nozzle, the cutting speed increases with pressure at lower levels. However, once the pressure exceeds 0.3 MPa, the cutting speed begins to drop instead. Further increases in pressure not only reduce the cutting speed but also cause the cut to widen and the surface to become rougher. During the gas flame cutting process on a CNC flame cutting machine, many factors influence the final cutting quality. These include the power of the preheating flame, the composition of the metal being cut, its physical properties, surface condition, and initial temperature. To achieve the best possible cutting results, it is essential to consider all these factors together. Only through a comprehensive understanding of these variables can the cutting process be optimized for maximum efficiency and precision.

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