关键词: 磨料水射流, 约束变形, 表面粗糙度, 可视化实验

Abstract:  When using sodium chloride grain jet to cut biological bone materials， the deformations of the jet beam might cause unexpected damage to the cutting sections of the bone materials， which was not conducive to the later recovery of biological tissue. In order to explore the deformations under the constraints of the side wall during jet cutting and the quality characteristics of the corresponding machined surfaces， a visualization experiment of abrasive water jet cutting was designed. A high-speed camera was used to photograph the abrasive water jet machining processes， the deformations of the jet beam were observed by visual means， and the surface roughness Ra was used to characterize the quality of the machined surfaces. It is found that the jet beam has a diameter-increasing deformation along the cutting feed direction under the joint constraints of the front-end sidewall and the two-side sidewalls， this deformation increases the range and frequency of the reduction in surface roughness along the depth of cut. Finally， through the secondary processing of the change data of surface roughness Ra along the depth of cut， a new idea of establishing the surface roughness prediction model of abrasive water jet cutting material was proposed. 

Key words: abrasive water jet, constrained deformation, surface roughness, visualization experiment