Papers by Keyword: Milling Force

Abstract: Cutting force equation was established for milling with flat end cutter as feeding in straight-line path by means of discretization method. The model of milling force was conducted based on the manufacturing character of cylindrical surface. The milling force is continual change in manufacturing process, it’s not only influenced by milling parameter, but also related with the shape of cam’s contour. Milling force can result in vibration as machining. Milling force prediction is very useful for manufacturing accuracy control.

Abstract: 300M ultra high strength steel, a new type of steel with broad prospects for development, has good mechanical properties, and is widely used for manufacture of aircraft landing gear. In order to reveal influence law of cutting parameters on milling force of 300M ultra high strength steel, the influence law of feed rate, milling width, and depth of cut and spindle speed on milling force is firstly studied through the single factor experiments in this paper. Secondly, the influence level of experimental factors is compared by orthogonal experiment. Finally, combined with orthogonal test data and the least square method, the multiple linear regression model of milling force in 300M ultra high strength steel milling is built. The accuracy of the model has been verified well by experimental verification, which has the guiding significance to reveal the milling mechanism and actual production.

Abstract: When machining the complex parts of aircraft engines, the milling force for the circular contour must be accurately predicted to reduce machining vibration. In this paper, the prediction model of the mean milling force per tooth during machining circular contour is developed. Firstly, the formulas of the entry angle, the exit angle and the equivalent feed per tooth are established through the analysis of circular contour milling process. Then, the equation of the mean milling force per tooth is deduced based on mechanistic force model during the circular contour machining process. Finally, the prediction model of mean milling force per tooth during machining circular contour is developed using MATLAB programming. The relationship between the milling force per tooth and surface curvature radius of the machined workpiece is also analyzed in this paper.

Abstract: In order to solve the problem of size guarantee related to thin-walled structure in traditional milling parameter selection, specific aluminum alloy frame part contains curved surface and thin-walled structure is studied. Numerical analysis is used in milling parameter selection method. Machining errors are calculated and checked based on milling force analysis. The milling process is simulated using finite element software. And aluminum alloy frame part processing is optimized from the angle of milling parameters according to the simulation results. Optimized milling parameters scheme is acquired, the results show that both machining precision and efficiency of the frame part are improved.

Abstract: Titanium alloy Ti-1023 is difficult to machine because of its high strength, chemical reactivity and low thermal conductivity. And it have tool wear and chipping due to its poor machinability. The relationship between milling force, tool life and milling parameters by adopting single-factor experimentation method is studied, The optimized milling parameters are selected, and processing efficiency is improved. The result shows: The appropriate cutting parameters of Titanium alloy Ti1023 are cutting speed Vc=15~20m/min, feed per tooth fz=0.12~0.18mm, depth of cut (DOC) ap=4~7mm; Besides, when the unit positive pressure of the cutting edge surpasses 320N, chipping is likely to happen on the blade.

Abstract: By three-dimensional milling simulations of Aviation Aluminum 7050-T7451 with metal cutting finite element analysis software AdvantEdge FEM, milling force data was obtained and amplitude-frequency characteristics was achieved through Fourier transformation of milling forces. According to mathematical statistical analysis of milling force data, we illustrates that the high-speed milling is a multi-blade interrupted cutting process and the tool vibration is a random vibration. Correlation functions and power spectral density functions of milling force and displacement were calculated in terms of signal processing discipline.

Abstract: High volume fraction SiCp/Al composites were milled in ultrasonic longitudinal and torsional vibration high speed milling and high speed milling in this experiment, study on effects of different milling parameters (milling depth ap, feed engagement fz, the milling speed vz) on milling force. The results shows that in the same cutting parameters ,the three milling force of ultrasonic longitudinal and torsional vibration high speed milling are smaller than that of high speed milling, and milling forces of two milling method increase with the add of the milling depth and feed engagement ,but they aren't fold increase. Milling forces of two milling method decrease with the add of the the minlling speed,and the changes become gently when the the minlling speed run up to 170m/min, with the further increase of the milling speed,ultrasonic vibration high speed milling will translate to high speed milling, this is because the torsional vibration is submerged.

Abstract: This article takes common material Cr12MoV for automobile panel die as research object, aiming at difficulties when tool cutting in workpiece which are caused by high material hardness in maching, based on simulation software DEFORM-3D, a high precision simulation model of cut-in process in hard milling die steel is established, and the accuracy of the model is verified by tests, the milling force cut-in process in hard milling die steel is studied, the influence law of different cutting parameters and cut-in angles on milling force in milling cutter cutting in workpiece is analyzed, and the optimized cut-in angles are obtained, this study provides a reference for further optimization of cut-in conditions, reducing tool early damage and improving processing efficiency.

Abstract: Nickel-based high-temperature alloy GH3039 is a kind of alloy with the poor thermal conductivity, work hardening and hard particle. It has poor machinability. The orthogonal experiment is adopted for the study on the effect of the cutting parameters on the high-temperature alloy GH3039 milling force by using the carbide tool. The milling force of the size is obtained by orthogonal cutting experiments under different cutting parameters, and analyzed the size of the cutting parameters on cutting force of law. The milling force experience formula is established by means of regression analysis. The rationality of the model is examined by using the absolute error calculation.

Abstract: High-speed milling of titanium alloys is widely used in aviation and aerospace industries for its high efficiency and good quality. In order to optimize machining parameters in high-speed milling TB6 titanium alloy, temperature distribution on the workpiece and the tool are analyzed, and the effect of milling parameters on milling force and milling temperature are investigated. The results show that the highest temperature appears on rake face, and near to the tool tip. With increasing of cutting time, heat affected zone on tool is bigger than that on workpiece. Milling temperature is most sensitive to the variation of milling speed, next sensitive to the variation of feed per tooth, and it is least sensitive to milling depth. Milling force is most sensitive to the variation of milling depth, next sensitive to the variation of feed per tooth, and it is least sensitive to milling speed.