Development And Experimental Study On Polishing System Of Abrasive Water Jet For Jade

“The jade culture” is an important component of Chinese traditional culture. The Chinese also has special emotion for jade crafts. With the development of economy, the demand of Chinese people for jade crafts are also increasing, The traditional manual production can apparently not meet the requirements of jade crafts. At present, the mechanized jade crafts processing mainly adopts the way of shock canister to polish jade crafts. But, the shock canister polishing method exist many significant disadvantages, such as bad polishing effect of external structure and texture, low polishing efficiency, etc. Abrasive water jet polishing technology has developed rapidly in recent years, It has been successfully applied to a variety of polishing materials with its unique advantages and characteristics, and It covers a wide application field. Abrasive water jet polishing technology can overcome effectively disadvantages and deficiencies of the shock canister polishing method, and can efficiently achieve the polishing effect of high quality for jade crafts.This dissertation firstly studies basic theories of abrasive water jet polishing. It starts from the basic theories in order to determine the type of jets, and analyzes internal structure and the flow field of jets theoretically. Besides, it discusses mechanisms of single abrasive erosion materials, and analyzes material removal mechanisms of single abrasive impact materials. Moreover, it analyzes polishing mechanisms of abrasive water jet flow theoretically. Furthermore, according to the energy conservation theory, it establishes a mathematical model of material removal rate. Ultimately, based on the theory researched above, it determines main process parameters that effect abrasive water jet polishing as guideline for follow-up studies.Secondly, it designs an abrasive water jet jade-polishing system according to the functional requirements of the abrasive water jet polishing principles and jade polishing system. This system mainly includes hydraulic pressure system, injection system, motion system and auxiliary system. With specific selection and structure design to each subsystem, and optimization to the structure of nozzle of injection system through the simulation analysis, this dissertation develops abrasive water jet jade-polishing system. The working pressure is 0~20MPa, which can adjust main process parameters that influences polishing effect easily, can spray fan-shaped jet in a uniformly distributed speed, and can satisfy the functional requirements for polishing jade. The final part of this dissertation studies abrasive water jet jade-polishing process experimentally by using developed abrasive water jet jade-polishing system. The jade polishing is divided into two processes, rough polishing and polishing. It studies the influences respectively that parameters of main process effect on the surface roughness in different processes by single factor experiments. According to the results, it analyzes the degree and regularities that each parameter effects on polishing in different processes, and summarizes the optimal combination of process parameters of two abrasive water jet jade-polishing process.