Study On The Influence Of Abrasive Particle Size On Abrasive Flow Machining

Abrasive Flow Machining is a new technology in finishing technology,which uses modified polymer materials in stable viscoelastic state to mix with abrasive particles and becomes semi-solid fluid abrasive,which is extruded through workpiece surfaces to achieve the purpose of polishing,deburring and chamfering.This process has great advantages for polishing narrow slit,micro hole and irregular hole cavity.Due to the advantages of Abrasive Flow Machining technology,the research on abrasive flow technology is increasing,but,there are many factors that affect the effect of abrasive flow machining,such as abrasive particle size,abrasive viscosity,processing temperature,workpiece material hardness,so that the research on its processing mechanism is very difficult and the progress is limited.In the process of application research and test,it is found that the abrasive particle size has a great influence on the Abrasive Flow Machining effect.In the process of processing,the surface quality of the abrasive workpiece with different particle size will show different processing limit,and the processing efficiency will also change with the abrasive particle size.However,other scholars in the previous research on the processing mechanism of abrasive flow clamp technology only established a processing model,ignoring the impact of abrasive particle size,by comparing the size relationship between different particle size and the initial surface topography of the workpiece,it was found that different particle size of the abrasive particles to establish different processing models.The workpiece surface needs to be regarded as a plan when establishing the machining model and analyzing the machining mechanism of large-size abrasive particles,and the surface of the workpiece should be regarded as a plane with a certain inclination Angle when establishing the machining model and analyzing the machining mechanism of small particle size,on the basis of this analysis,the influence law of abrasive particle size on processing limit and processing efficiency in Abrasive Flow Machining process is studied,and design a experiment scheme of different particle size abrasive alternating use to break through the limitation of the traditional experiment scheme,to achieve better processing effect,to provide a new idea for the theoretical analysis of Abrasive Flow Machining processing technology and the choice of abrasive particle size in the actual production.The main work and conclusions are summarized as follows:(1)The factors influencing the machining effect of abrasive flow technology are studied,and the flow characteristics of fluid abrasive are analyzed.The influence rules of abrasive indentation depth and abrasive particle size on the workpiece surface material removal methods were summarized,and the conditions of abrasive material removal on the workpiece were analyzed.The inner surface of stainless steel capillary with a surface roughness of Ra=1.97?m was measured,and the measured microtopography was obtained,and the machining models were divided into large particle size machining model at mesoscopic scale and small particle size machining model at microscopic scale by comparing the contact relationship with the abrasive particles of different sizes,and analyze the force on them respectively,the workpiece surface is regarded as a plane when analyzing the processing mechanism of large-size abrasive particles,and the workpiece surface is regarded as a inclined plane with certain Angle when analyzing the processing mechanism of small-size abrasive particles.(2)On the basis of theoretical analysis of processing mechanism of abrasive particles with different particle sizes,processing experiments of abrasive materials with different particle sizes were arranged.The experiment of different grain-size abrasives to reach the processing limit is summarized and the causes of processing limit for different grain-size abrasives in the processing process are analyzed,while the processing efficiency of different particle size abrasives in the processing process is compared and analyzed.It is concluded that the material removal amount of large-size abrasive in each processing process is large and the processing efficiency is high,but the effective processing times are less,and it is easy to reach the processing limit,and the phenomenon of excessive processing appears.The material removal amount of small-size abrasive in each processing process is small,and the processing efficiency is low,but the effective processing times before reaching the processing limit are more,which can obtain better processing quality.(3)In order to obtain better processing effect,based on the analysis of the change rule of processing limit and processing efficiency of different grain-size abrasives in the process of Abrasive Flow Machining technology,an experimental scheme of using large grain-size abrasives and small grain-size abrasives alternatively was proposed and arranged.Through the comparison of the experimental results,it is found that the new experimental scheme can obtain better processing quality and improve the processing efficiency,which also provides a new idea for improving the processing effect of Abrasive Flow Machining technology in the actual production.