The Correlation Characteristics Of Titanium Alloy Vibration And Cutter Wear

The large titanium alloy structural parts are the main components that make up the skeleton and aerodynamic configuration of the aircraft,tool wear affects the machining efficiency and quality of milling.Adopting high speed milling of titanium alloy structure,The interaction between the vibration of the workpiece and the wear of the milling cutter leads to the wear difference problem which severely restricted the service life of the tool and become a key problem to be solved in structure milling titanium alloy.According to the above issues,the finite element modal analysis of titanium alloy structure and the cutter are carried out.The natural frequency and mode vibration of titanium alloy structure and cutter are obtained.The cutter centrifugal force model and the transient milling force model were established in the process of high speed milling titanium alloy structural parts,the tool contact relation of dynamic milling in milling process is studied.It provides basis for studying the vibration and wear characteristics of workpiece in high speed milling titanium alloy.Milling titanium alloy structural vibration test scheme is put forward,the vibration test experiment of milling cutter for structural parts of high speed milling titanium alloy was carried out.Extracting vibrational feature parameters and analyzing the evolution of vibration acceleration effective value,steep degree and main frequency parameters with cutting stroke.It can recognize the vibration characteristics of titanium alloy structural parts milling system and provide the basis for the correlation analysis of vibration and wear characteristics.The wear morphology of the front and back cutting surfaces and the bottom angle of the milling cutter was observed by means of the wear state diagram obtained by experiments.The mechanism of diffusion wear,oxidation wear,adhesive wear and abrasive wear of milling cutter is analyzed and expounded respectively.The wear characteristics of the main cutting edge and the rear edge of the milling cutter are extracted and analyzed by means of the equal spacing wear width measurement To study the difference of tool wear.Using dual higher order polynomial build wear width distribution function of major flank wear width with the change of milling process and position,reveal the maximum wear width and their changing situation with milling,and the wear difference of each blade’major cutting edge and minor cutting edge to provide a basis for studying the correlation between vibration of workpiece and tool wear.Based on the above research,adopt the method of grey correlation analysis,with structure milling titanium alloy tool major cutting edge and minor cutting edge wear width of blade wear characteristic parameters to build the reference sequence,with titanium alloy milling vibration time domain and frequency domain signal characteristic parameters to establish comparative sequence,studying the reference sequence and compare sequence similarity.It is revealed that the vibration energy of titanium alloy structural parts and the relationship between the impact of the main cutting edge and the wear width of the cutting edge at the bottom edge of the milling cutter in the process of high-speed milling titanium alloy structural parts.