Consumption of sand pipe during waterjet operation
Waterjet cutting is very powerful. The mold of the waterjet is an "L"-shaped "tubular" object. The water will impact the wall of the L-shaped bend in the process of turning through the L-shaped bend and cause the loss of the mold. The non-wear of the water jet can be explained by the phenomenon of viscous. Due to the existence of viscous force, the flow rate of water increases with the increase of the distance from the pipe wall. Therefore, although the flow speed of the water jet is quite large, the inner wall of the water jet is worn out. Nothing serious. Secondly, the friction force when the waterjet is working mainly comes from the sand particles inside, and the viscosity coefficient between the sand particles and the water is so large that the sand particles are more easily driven by the water, so as to achieve a greater speed, and the water with a greater speed In the center of the pipe, the sand particles generally will not touch the pipe wall, so that the wear is minimized.
There is another question: Did the exit give him any force when the water jet came out to increase its speed, and then the force also increased? The pressure at the outlet of the water jet is above 50 MPa, which is equivalent to the pressure generated by placing a 5 kg object on an area of 1 square millimeter. Under the action of such a large pressure, when this supersonic water flow rushes to the processed material, its speed will drop rapidly due to the sudden obstruction, and the pressure will increase suddenly as a result, and a huge amount will be generated in an instant The impact force caused brittle fracture on a very small area of the processed part, so as to achieve the purpose of cutting the workpiece. If grinding materials such as silica are mixed in the water, the cutting ability of the water jet will increase exponentially, and its processing effect is significantly better than cutting the workpiece with a metal knife. It can process complex profiles that cannot be processed with metal tools and parts cut along any curve. In the process of processing, not only the cuts of the workpiece processed by the "water jet" are neat and smooth, and there are no problems such as rough edges, delamination, tearing, deformation, etc., and almost all the heat generated during the working process can be taken away by the water. At the same time, in the cutting process, the vibration and noise caused by the "water jet" are very small, and the small amount of chips produced will also flow away with the water, and there will be no flying chips.