Ultra high pressure water jet can cut all kinds of hard materials: stainless steel, aluminum, copper, steel, marble, glass, plastic, ceramics, tile and all kinds of visible materials. The precision of water jet cutting: the precision of cutting workpiece is between 0.1mm and 0.25mm. The accuracy of the workpiece depends on the accuracy of the machine, the size and thickness of the workpiece to be cut. How wide is the cutting gap of the water jet cutter: it depends on the size and thickness of the cutting material and the nozzle used. Generally speaking, the incision of sand cutting is about 1.0mm to 1.2mm. With the expanding of the diameter of the sand knife tube, the larger the incision is. What kind of beveled edge will be produced when cutting with a water jet cutter? The quality of beveled edge depends on the cutting speed. Most of the good cutting qualities seen are about 0.1mm bevel on one side.
         What kind of material should be cut with a water jet cutter: Generally speaking, materials with complex patterns, thick, difficult to cut, fragile and heat resistant are the most suitable for cutting with a water jet cutter as the processing equipment. Comparison between water jet and laser: laser cutting is a manufacturing method to improve production capacity, and of course, it also has its use. In some ways, the water jet cutter is better than laser: 1. There is no restriction on cutting thickness; 2. Reflective materials such as brass and aluminum can be cut; 3. No heat energy is needed, so it will not burn or produce heat effect; 4. When you change the cutting material, the only thing you need to change is cutting speed; and you do not need to change gas, focus or other objects, 5. It is easy to install more cutting heads to increase production capacity. 6. Laser equipment maintenance is more professional and difficult. 6. You can have a complete set of water jet equipment at the price of 1 / 2 to 1 / 3 of laser equipment.
         Normally, the cutting speed and depth of the water jet cutter increase with the decrease of the diameter of the nozzle outlet, but when the pressure is fixed, the diameter of the nozzle will be reduced, and the jet will generate atomization near the nozzle due to the air entrainment, so that it will lose the cutting ability. The cutting depth and width of the machined part decrease linearly with the decrease of nozzle diameter. Under the same pressure, reducing the nozzle diameter will reduce the cutting energy ratio of the jet. The straightness of the workpiece in the moving direction of the high pressure jet is independent of the nozzle diameter. Through the observation of the fracture surface quality of different materials and different process parameters, it is found that there are common features in the cross-section morphology of the workpieces: the upper part of the cross-section is smooth, while the lower part has concave and convex diagonal stripes; when the jet penetration capacity is low, there are obvious pit areas at the bottom of the cross-section; the shape of the cutting section of the workpieces is V-shaped, large in the upper part and small in the lower part, When the depth of the incision reaches a certain degree, the width of the downstream section does not change. In addition, the cutting angle of copper plate, aluminum plate, marble and granite is between 514 ° and 616 °. The cutting angle of different materials is slightly different, and the size of the cutting angle is independent of the nozzle diameter. The cutting width is larger than the jet diameter, and the smaller the diameter is, the more obvious the trend is.
         However, with the increase of nozzle diameter (0.1mm to 0.4mm), the cutting depth decreased. The diameter of the nozzle outlet for cutting is recommended to be selected within 0.1L ~ 0.3mm. In addition, although the cutting speed and depth decrease with the increase of nozzle diameter, the width of cutting seam increases, that is, the amount of material damage per unit time increases. Under the same pressure condition, comparing the slit quality of materials processed by 0.1mm and 0.4mm nozzles, it is also found that with the increase of nozzle diameter, the slit becomes wider, the particle size of chips becomes larger, and the slit quality (roughness) is significantly worse. The influence of nozzle diameter on cutting quality. The straightness of the test piece in the direction of jet movement is independent of the nozzle diameter, and the size of the incision angle is independent of the nozzle diameter. Under the same pressure, the reduction of nozzle diameter will reduce the jet penetration ability and the cutting quality. Considering the factors of energy consumption, material saving, cutting efficiency and equipment investment, it is better to choose 016-110mm nozzle diameter for common material cutting, and it is not suitable for abrasive jet cutting below 012mm.
         It can be considered that the total energy relationship of the increase of material crushing amount with the increase of jet power has not changed. Although the increase of jet pressure and nozzle diameter can increase jet power, the effect is quite different. The former makes the cutting speed and depth increase obviously, while the latter only increases the amount of material broken, while the cutting speed and depth decrease. However, with the increase of nozzle diameter, the contact area of the jet acting on the processed material increases, which increases the crushing resistance of the material, resulting in the decrease of cutting speed and cutting depth.
         Therefore, when the jet is used in cutting operation, increasing the jet pressure is an effective way to improve the operation efficiency. However, for jet cleaning, rust removal and peeling operations, since the cutting depth factor is almost not considered, and the jet area factor is more important, it is more effective to increase the nozzle diameter to improve the operation speed when the jet pressure reaches the cleaning requirements.