Research On Abrasive Suspension Jet Technology And Its Mechanism

With the rapid development of industcial process, more and more high performance meterials are developed, and many of them have special structures. If they are cut via some conventional methods, it's difficult to get high quality. When the meterials are cut with sketch shaped specially, it's very difficult to obtain the design requirement. Since the abrasive jet cutting has the features of cold conditions, point-cut, commonality, high-quatily and pollution-free, it occupies more and more important position in the cutting field.But there are some shortages in the existing abrasive jet technology or there are some imperfect influencing the wide using of it in our country. Such as high-pressure(≥200Mpa )is used in abrasive jet cutting sytem and this make a application bottleneck in our country because of the nozzle abradability or the hermetic problem with high-pressure which influence the stability and the reliability of the system. Since the nozzle size is bigger in the dia-injected abrasive water jet cutting system, the cutting width is bigger, the cutting face is rougher, the abrasive grain is easyer to deposit or plug in the pipe, and the continous feeder process can't be realized.This paper is presented and studied with above technology background, the research mainly reduces the system pressure in the process technology, realizes the recycled use of the abrasive suspension and the high-pressure transfer medium separately, new process and method are presented which improve the proces structure, reduce the machining cost. The rheological characters, the flow field characters are explored and grasped, the numerical simulation of the flow field in nozzle is made, the abrasive suspension jet cutting performance is studied. In this paper, the structure of the high-pressure tank which is the key device of the system is designed, in which the abrasive suspension and the the high-pressure transfer medium is complete isolated. The transfer mechanism of the high-pressure tank oversea is changed. Based on this foundational study, the total structure and the process flow are designed, the recycled use of the abrasive suspension and the high-pressure transfer medium independment is realized, and the work process of system is designed to be work continuously.The additive structure features in the suspension are studied. It is analysed about main technical features of the abrasive suspension that it has good dispersibility, suspension property, good thixotropy and lubricity. Using the rheologic principle and the method, basing on the least squares techniques, the author selected the rheological model is the power-law model, established the constitutive equation form of the abrasive...