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Influence of water jet nozzle on waterjet cutting effect

Post time:2019-07-11    By:EAAK    Clicks:
Normally, the cutting speed and depth of the water jet increase as the nozzle outlet diameter decreases, but the nozzle diameter is reduced with a constant pressure, and the jet will be atomized close to the nozzle due to air entrapment. So that it loses its cutting ability. The depth of the cut and the width of the slit are substantially linearly decreasing as the diameter of the nozzle decreases. At the same pressure, reducing the nozzle diameter reduces the jet energy consumption ratio of the jet. The straightness of the workpiece in the direction of movement of the high pressure jet is independent of the nozzle diameter. By observing the fracture surface quality of each workpiece with different materials and different process parameters, it is found that the cross-section of the workpiece has common features: the upper part of the section is smooth and the lower part has concave and convex diagonal stripes, and the jet penetration ability is low. There is a clear pit area at the bottom of the section. The shape of the section of the workpiece is V-shaped, and the upper and lower sides are small. When the depth of the cut reaches a certain level, the width of the downstream section does not change. In addition, the measured angles of the four materials of copper, aluminum, marble and granite are between 514 ° and 616 °. The notching angles of the different materials are slightly different. The size of the notch angle is independent of the nozzle diameter. The cut width of the machined part is larger than the diameter of the jet, and the smaller the diameter, the more significant the trend.
However, as the diameter of the nozzle increases (0.1 mm to 0.4 mm), the depth of cut decreases. The diameter of the nozzle for cutting is recommended to be selected within 0.1l~0.3mm. In addition, factors affecting the waterjet cutter, although the cutting speed and the cutting depth are reduced as the diameter of the nozzle increases, the slit width is increased, that is, the amount of damage per unit time is increased. Under the same pressure conditions, it was found that the quality of the slits of the material processed with the diameters of o.1mm and 0.4mm nozzles increased, as the nozzle diameter increased, the slits became wider, the chip size became larger, and the slit quality (roughness) Also significantly worse. The effect of nozzle diameter on the quality of the cut. The straightness of the test piece in the direction of jet movement is independent of the nozzle diameter, and the size of the cut angle is independent of the nozzle diameter. At the same pressure, the reduction in nozzle diameter reduces the jet penetration capability, resulting in reduced cut quality. Considering the energy consumption, saving materials, cutting efficiency and equipment investment, the diameter of the nozzle for common material cutting is preferably 016 ~ 110 mm, and it is not suitable for abrasive water jet cutting below 012mm. It can be considered that the total energy relationship of the amount of material fracture increases as the jet power increases does not change. Although the water jet pressure and the increase in the diameter of the nozzle increase the jet power, the effect is quite different. The former significantly increases the cutting speed and cutting depth, the latter only increases the amount of material breakage, while the waterjet cutting speed and cutting depth decrease. However, due to the increase in the diameter of the nozzle, the contact area of ​​the jet acting on the material to be processed is increased, thereby increasing the fracture resistance of the material, resulting in a decrease in the cutting speed and the cutting depth.
Therefore, when the jet is used for water jet cutting operations, increasing the jet pressure is an effective way to improve work efficiency. However, in the case of jet cleaning and rust stripping, since the cutting depth factor is hardly considered, and the waterjet action area factor is more important, when the jet pressure reaches the cleaning requirement, the nozzle diameter is increased to increase the working speed. More effective.

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