Study Of Mechanism And Key Technology Of Abrasive Waterjet Cutting Of Engineering Ceramics

Engineering ceramics have good properties such as resistant to corrosion, high temperature resistance, wear resistance and impact resistance.With the development of processing technology, It has the possibility of substitution of other materials. However, using the traditional processing methods, there are the following issues: the high processing costs, processing efficiency is low, processing quality is not satisfactory, and there are special shapes required processing of the product is difficult to complete. These issues limit the scope of application of engineering ceramics.For engineering ceramics, the abrasive water jet machining is cost-effective non-traditional processing technology. It does not heat, electricity and chemical reaction process, the workpiece does not produce the metallurgical, chemical or physical properties change, AWJ can processe high quality and special properties of new engineering ceramic products. Engineering ceramic products are widely used in machinery, electronics, aerospace, defense industry, bio-engineering and other fields. At present, China in the abrasive water jet cutting mechanism of Engineering Ceramics and key technical aspects of the research is still far from fully. Domestic abrasive water jet equipment mainly imported. In addition, due to the lack of the abrasive water jet cutting mechanism of the in-depth study, The introduction of equipment performance has not been fully utilized. Abrasive Water Jet Machining product quality, efficiency and cost with a considerable gap between the developed countries. Therefore, this research to further promote the implementation and will facilitate the engineering ceramics processing and applications development, improve the domestic status of abrasive water jet machining has important practical significance.In this paper, based on the experiment, combined with computer simulation technology, abrasive water jet cutting of engineering ceramics mechanism and key technologies are studied.1. Engineering Ceramics special processing techniques and abrasive water jet cutting technology and its latest developments in the field of theoretical research are outlined. Analysis of the abrasive water jet cutting engineering ceramics key technologies, and clarify the purpose and significance of this study.2. Application of two-phase flow theory,abrasive water jet mixing mechanism and flow characteristics are analyzed, Impact force model is established, further study of abrasive water jet cutting engineering ceramics, obtain its cutting mechanism, the abrasive water jet spray to engineering ceramics, resulting in a strong Impact force, destruction of ceramic surface to form micro-cracks, water into the cracks to form water wedge in the crack, Tensile stress is concentration at the crack tip; Abrasive with sharp edges and corners, it is micro-cutting ceramics; liquid-solid two-phase high-energy beam on the ceramic produced a strong erosion effect. The role in these areas, the crack expanded, forming notch.3. Using different combinations of the parameters, abrasive water-jet cuts several commonly used engineering ceramics. Influence of the jet pressure, abrasive water nozzle traverse speed, target distance, abrasive flow rate of process parameters on cutting efficiency and cutting quality are researched and analysed.4. Based on theory and application of experimental data obtained fuzzy inference rules, the fuzzy control model is established. This particular fuzzy control model can predict cutting depth for any given set of processing parameters. At a given depth of cut conditions, the genetic algorithm combined with fuzzy models can automatically determine the best parameter combination of abrasive water jet cutting.5. Nozzle is worn when the abrasive water jet in the nozzle flow. Wear factors are classified and defined. Respectively, in the experiment and simulation both cases, the nozzle wear law being studied to optimize nozzle structure. On the basis of the experimental study of the nozzle materials and processing technology, proposed nozzle localization approach.Through the study of the theory of abrasive water jet, for equipment design and development provide a theoretical reference. The experimental data to provide design parameters for the production of key components Through the process parameters of the study, The cutting parameters are the effective use.Cutting efficiency and cutting to achieve the best combination of quality Optimization of process parameters with the hybrid method, save a lot of experimental work, get the best cutting results. In this paper, Fluent software to simulate the internal structure of the nozzle, optimizing the nozzle structure, and selection of WC-Co powder as the nozzle material, cold isostatic pressing to suppress the nozzle blank, using a vacuum sintering. Use of CNC EDM Machine, the internal structure of the nozzle is processed. Nozzle hole is honed with "Extrude Hone." Developed the nozzle compared with imports, the cost savings of 50%.