Papers by Keyword: Milling Force

Abstract: Plunge milling force experiment was designed based on the method of orthogonal experiment, selecting Cr12 mold steel as the experimental material for obtaining the measurement data. Combined with the experimental data, the empirical formula of the milling force model and BP neural network model were established respectively. The two types model are analyzed and compared. The results show that the BP neural network model has a better prediction effect than traditional empirical formula.

Abstract: Metal milling processing principle and the elastic-plastic deformation theory were combined in this paper. The mathematical model of milling force and residual stress in the NC milling process was deduced by the theory. By the obtained mathematical model, could further analyze the effect of milling force on the residual stress and then obtain the law of milling force to milling deformation. This proved the strong a theoretic guarantee for controlling the machining deformation.

Abstract: On the condition of some milling depth and feed rate, By means of high-speed milling force measurement of SiCp/Al matrix composite, the rule for impact of milling speed on milling force is revealed successfully. In some range of milling speed, when SiCp/Al is high-speed milled, the milling force is lowered with increase of milling speed. Furthermore, the experiment also show that the optimal milling speed should be adjusted between 200 and 260 m/min for the SiCp/Al matrix composite with 56% volume fraction and particle size of 60μm.

Abstract: This paper Studied the milling thickness and milling force on two directions ultrasonic vibration assisted milling. X direction ultrasonic vibration assisted milling periodic can generate periodic separation between the tool tip and the workpiece during the cutting process, so the milling force can be reduced, and the effect of the pulse cutting can be produced. Y direction ultrasonic vibration assisted milling can reduce the average cutting force, and milling width can be increased in Y direction ultrasonic vibration assisted milling, so the surface quality can be improved.

Abstract: Nowadays, composite material is more and more popular mainly because of its low density and high strength. This paper focuses on experimental research of coarse milling process of carbon fiber reinforced carbon matrix composite (C/C composite) in low spindle speed and large milling depth. The milling force prediction model for milling of composite using the end milling cutter is built by orthogonal experiment. Experiment test shows that the results predicted by the proposed model are in well agreement with measured ones and the milling force increases with the increment of feed per tooth, milling depth and milling width, and the effect of milling speed on milling force is not very obvious. In addition, machining accuracy and quality of machined surface is difficult to satisfactory, because of the existence of the substrate lacunas and carbon fibers in C/C composite, by using the existing ordinary material surface integrity evaluation method.

Abstract: The paper takes the cold working die steel Cr12 for specimen material,carries out the plunge milling test on Cr12 and the plunge milling force has been measured by YDX - Ⅲ 9702 piezoelectric milling dynamometer. The tool deformations are analyzed both in plunge milling and side milling on the same size milling force. Test and analysis show that the axial milling force significantly greater than the other two directions and the tool deformation in plunge milling less than the tool deformation in the side milling.

Abstract: Along with the development of high speed machining technology, the ball end milling cutter’s application is more and more widely. An influence of four control parameters, namely feed, cutting depth, spindle speed and cutting width, on cutting forces is investigated. This paper focuses on experimental research of milling process of carbon fiber reinforced carbon matrix composite (C/C composite). The milling force prediction model for milling of composite using the carbide ball-end tools is built by orthogonal experiment. The experiment results show that : the reliability of the this prediction model is quite high, and the effect of milling speed on milling force is not very obvious, but the milling force increases with the increment of feed per tooth, milling depth and milling width. Using this information, a new prediction model for the milling forces is proposed that can be used for C/C composite milling.

Abstract: The machinability of Nickel-based superalloy GH4169 is poor, the traditional methods to machining is application of cutting fluids with the active additives which cause environmental pollution and health problems. In this paper, the water vapor was applied on milling instead of cutting fluids for the aim of green milling GH4169. The effects of water vapor, oil emulsion and dry cutting on milling force and the surface roughness have been examined with carbide tools YG6A. The results of experiments indicated that application of water vapor produced lower milling force, the values were reduced about 7 percent compared to dry cutting, and it is advantage in surface roughness. The research results show that clean production was achieved in metal cutting associated with water vapor cooling and lubricating.

Abstract: Based on the characteristics of austenitic stainless steel 1Cr18Ni9Ti, aiming to decrease surface roughness and milling force orthogonal face milling experiment with four factors and four levels was designed to optimize machining parameters with consideration of material removal rate. Three relatively excellent machining parameters were taken to further figure out the influences of cutting speed on tool life, and the tool wear mechanism was also analyzed. The results indicated that both surface roughness and milling force were greatly influenced by cutting speed and feed. The best machining parameters obtained in the experiments were v: 200m/min, f_z: 0.1mm/z, a_p: 0.9mm, a_e: 35mm. The main tool failure mode under this circumstance was tool chipping at the flank between main cutting edge and surface to be processed, besides, the wear of rake face was relatively slight.

Abstract: The tool geometric angle and cutting parameters have a significant influence on the titanium alloy milling process by the usage of solid carbide end mills.The physical simulation method was applied to predict the cutting force and temperature by using two comparative sets of simulation data such as the different tool gemetric angle as tool rake angle, helix angle and different cutting parameters such as spindle speed, axial depth of cut, radial depth of cut. Thus are the commonly used methods to simulate and predict the cutting process before the actual production, which can reduce product cost and time.