| Glass fiber composite is an inorganic non-metallic material with excellent physical and chemical properties.Glass fiber is widely used in aerospace,electronics,chemical,transportation and defense.At the same time,the glass fiber composite material is also a difficult-to-machine material,which contains a very high content of silica,and causes serious problems such as severe tool wear,workpiece delamination,slag and dust.These problems seriously affect the quality of their processing and cannot meet the actual needs.Ultrasonic vibration assisted cutting technology originated in the 1960s.Compared with traditional cutting technology,it has the advantages of reducing cutting force,improving surface quality and tool life.Therefore,it is necessary to apply ultrasonic assisted cutting technology to the processing of glass fiber composites.In this paper,ultrasonic-assisted cutting of glass fiber composites is studied,and its processing mechanism,experiment and simulation are studied.The main research contents are as follows:(1)The motion characteristics of the tool in the ultrasonic assisted turning process and the mathematical model of the tool turning glass fiber are established.The cutting force under each machining parameter is analyzed based on the mathematical model.At the same time,the fiber damage and material removal mechanism of glass fiber composites were analyzed.(2)The ABAQUS finite element analysis software was used to simulate the ultrasonic assisted turning glass fiber composites.Under the condition of intermittent cutting,the effects of various processing parameters on cutting force,base damage,base crushing and cracking under ultrasonic vibration conditions and ordinary machining conditions were analyzed.(3)The ultrasonic assisted cutting glass fiber composite experiment platform was built to investigate the effects of turning speed,cutting depth,feed rate and amplitude on cutting force.The single factor experiment of cutting force was carried out by changing the processing parameters,and research on the influence of each processing variable on the cutting force.Compared with the simulated cutting force,the relationship between the two groups of data is analyzed.(4)The effect of ultrasonic assisted machining glass fiber composites on its surface quality was investigated.The surface quality single factor experiment was carried out with the cutting depth,feed rate and amplitude as parameters.In this test,the relationship between each processing parameter and surface quality was analyzed.At the same time,orthogonal experiment which has 3 levels and 4 factors were carried out to investigate the influence of processing parameters on the surface quality of the workpiece.(5)The tool wear experiment which using ultrasonic assisted and conventional way to machine the glass fiber composites was carried out.The wear conditions of cutting tool was observed. |
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