| With the development of industrial technology,the application of titanium alloy materials has become more and more extensive,and new requirements for high-quality,high-efficiency hole processing of titanium alloy materials have also been put forward.Due to its special material properties,titanium alloy materials have low processing efficiency and low yield,which increases the manufacturing cost and prolongs the cycle of equipment manufacturing.Ultrasonic-assisted drilling technology is a modern processing technology that can effectively improve the processing efficiency and quality of difficult-to-machine materials.Compared with traditional ordinary drilling,it has the advantages of high processing efficiency and good processing quality.Based on the application status of ultrasonic assisted processing technology at home and abroad,this paper takes the titanium alloy materials widely used in the aviation industry as the research object,and analyzes the influencing factors and laws of ultrasonic assisted drilling technology through finite element simulation technology,which is highly efficient for titanium alloy materials.Hole processing provides guidance,and the main research contents of this paper include:First,the influence of ultrasonic vibration on drilling processing is theoretically analyzed.The motion model of the tool in the ultrasonic assisted drilling process is established.The influence of the ultrasonic vibration on the tool’s motion characteristics,cutting characteristics and impact characteristics is analyzed.The cutting force model of the tool unit blade is used to obtain the drilling force of the ultrasonic assisted drilling.The reason why the chip is more prone to chip breaking effect in ultrasonic assisted drilling is analyzed.At the same time,the influence law of ultrasonic vibration parameters on the average friction force in drilling process is obtained,which provides a basis for rational selection of ultrasonic vibration parameters.Secondly,according to the principle of metal cutting and finite element theory,the finite element model of titanium alloy with thermal-coupled three-dimensional ultrasonic assisted drilling was established by using ABAQUS software.The analysis shows that the drilling force and torque of drilling after loading ultrasonic vibration are reduced by about 26% and 22%,respectively,and the larger the amplitude,the more obvious the drilling force and torque reduction;due to ultrasonic friction reduction and interrupted cutting The cutting temperature at the cutting edge in the ultrasonic assisted drilling process is significantly smaller than that in the ordinary drilling.The lower cutting temperature can improve the life of the tool in the drilling process and reduce the probability of material burn;the chip of the ultrasonic assisted drilling is fragmented.It is easier to eliminate;at the same time,the burr height of the orifice is small,and the residual compressive stress on the machined surface after cutting is large,which can improve the life of the workpiece to some extent.Finally,an ultrasonic assisted drilling system was designed to drill the titanium alloy experiment.The experimental results show that the average wear band width of the tool flank face is smaller and the life of the tool is prolonged in the ultrasonic assisted drilling process.The macroscopic surface quality of the hole wall after machining is known to be obvious.The chip has scratches,and the surface roughness of the hole wall after ultrasonic assisted drilling is measured by the white light interferometer,and the processing quality is higher.It is proved that ultrasonic assisted drilling improves the machining quality of the drilling process and prolongs the service life of the tool. |
