Forces acting on abrasive in the process of speeding up have been analyzed. Motion differential equation of abrasive in a pipeline and nozzle has been given, respectively. Mechanisms of abrasive particles accelerated ...Forces acting on abrasive in the process of speeding up have been analyzed. Motion differential equation of abrasive in a pipeline and nozzle has been given, respectively. Mechanisms of abrasive particles accelerated in a premixed abrasive jet has been analyzed. The study shows that driven by high-pressure water, velocity of an abrasive is near to velocity of water in pipeline through the acceleration distance. In the taper section of a nozzle, water and abrasive particles are greatly accelerated at the same time. But velocity of an abrasive always lags behind velocity of water. A premixed abrasive jet cutting system has been introduced. The structure and working principles of the system have been given. The system is an assembly of abrasive screening and filling. By use of the premixed abrasive jet cutting system established, cutting experiments have been made to test the main parameters which influence the cutting performances such as working pressure, standoff and traverse velocity, and the nozzle diameter affecting cutting chink width.展开更多
This paper describes the application of orthogonal test design coupled with non-linear regression analysis to optimize abrasive suspension jet （AS J） cutting process and construct its cutting model. Orthogonal test ...This paper describes the application of orthogonal test design coupled with non-linear regression analysis to optimize abrasive suspension jet （AS J） cutting process and construct its cutting model. Orthogonal test design is applied to cutting stainless steel. Through range analysis on experiment results, the optimal process conditions for the cutting depth and the kerr ratio of the bottom width to the top width can be determined. In addition, the analysis of ranges and variances are all employed to identify various factors： traverse rate, working pressure, nozzle diameter, standoff distance which denote the importance order of the cutting parameters affecting cutting depth and the kerf ratio of the bottom width to the top width. ~rthermore, non-linear regression analysis is used to establish the mathematical models of the cutting parameters based on the cutting depth and the kerr ratio. Finally, the verification experiments of cutting parameters＇ effect on cutting performance, which show that optimized cutting parameters and cutting model can significantly improve the prediction of the cutting ability and quality of ASJ.展开更多
对非淹没磨料射流中磨料颗粒的运动规律进行了仿真与切割实验研究。结果表明,磨料粒子与连续相的相互耦合会改变连续相的流场分布,使流场速度下降。磨料粒子90%以上的动能在喷嘴内获得,但在喷嘴内没有得到完全加速;切割物料的较佳磨料...对非淹没磨料射流中磨料颗粒的运动规律进行了仿真与切割实验研究。结果表明,磨料粒子与连续相的相互耦合会改变连续相的流场分布,使流场速度下降。磨料粒子90%以上的动能在喷嘴内获得,但在喷嘴内没有得到完全加速;切割物料的较佳磨料浓度值为4.5%～8.5%;对于喷嘴直径大于1 mm 的射流,磨料基本尺寸为φ0.15～0.3 mm 切割效果较好,对于喷嘴直径小于1 mm 的射流,磨料直径为喷嘴出口直径的1/3～1/4比较合适;磨料入口速度对出口速度的影响小,为了减小管路系统的堵塞,磨料罐至喷嘴段管路应尽量短并且最好竖直安装。展开更多
基金supported by the Natural Science Foundation of Anhui Province under Grant No.KJ2009A092
文摘Forces acting on abrasive in the process of speeding up have been analyzed. Motion differential equation of abrasive in a pipeline and nozzle has been given, respectively. Mechanisms of abrasive particles accelerated in a premixed abrasive jet has been analyzed. The study shows that driven by high-pressure water, velocity of an abrasive is near to velocity of water in pipeline through the acceleration distance. In the taper section of a nozzle, water and abrasive particles are greatly accelerated at the same time. But velocity of an abrasive always lags behind velocity of water. A premixed abrasive jet cutting system has been introduced. The structure and working principles of the system have been given. The system is an assembly of abrasive screening and filling. By use of the premixed abrasive jet cutting system established, cutting experiments have been made to test the main parameters which influence the cutting performances such as working pressure, standoff and traverse velocity, and the nozzle diameter affecting cutting chink width.
基金supported by the Science and Technology Development Foundation of Shanghai Municipal Science and Technology Commission (Grant No.037252022)
文摘This paper describes the application of orthogonal test design coupled with non-linear regression analysis to optimize abrasive suspension jet （AS J） cutting process and construct its cutting model. Orthogonal test design is applied to cutting stainless steel. Through range analysis on experiment results, the optimal process conditions for the cutting depth and the kerr ratio of the bottom width to the top width can be determined. In addition, the analysis of ranges and variances are all employed to identify various factors： traverse rate, working pressure, nozzle diameter, standoff distance which denote the importance order of the cutting parameters affecting cutting depth and the kerf ratio of the bottom width to the top width. ~rthermore, non-linear regression analysis is used to establish the mathematical models of the cutting parameters based on the cutting depth and the kerr ratio. Finally, the verification experiments of cutting parameters＇ effect on cutting performance, which show that optimized cutting parameters and cutting model can significantly improve the prediction of the cutting ability and quality of ASJ.
文摘对非淹没磨料射流中磨料颗粒的运动规律进行了仿真与切割实验研究。结果表明,磨料粒子与连续相的相互耦合会改变连续相的流场分布,使流场速度下降。磨料粒子90%以上的动能在喷嘴内获得,但在喷嘴内没有得到完全加速;切割物料的较佳磨料浓度值为4.5%～8.5%;对于喷嘴直径大于1 mm 的射流,磨料基本尺寸为φ0.15～0.3 mm 切割效果较好,对于喷嘴直径小于1 mm 的射流,磨料直径为喷嘴出口直径的1/3～1/4比较合适;磨料入口速度对出口速度的影响小,为了减小管路系统的堵塞,磨料罐至喷嘴段管路应尽量短并且最好竖直安装。
