Papers by Keyword: Milling Force

Abstract: Machining the aircraft skin, using CNC milling to replace the traditional chemical milling, is a trend owning to the great pollution of the chemical milling to the environment. Based on the instantaneous rigidity force hypothesis, a milling force model for mirror milling of aircraft skin was proposed, which was validated by the milling force measurement during mirror milling experiments. A FEM model was established to calculate the deformation of the aluminum plate in mirror milling. The effects of the supporting position on the deformation was analyzed.

Abstract: Iron-based alloy GH2132 is a kind of difficult-to-machine material. In this study, the experiments were processed to research the effect of feed per tooth, axial cutting depth and radial cutting depth on milling force. Variance analysis was made on the three factors. The results reveal that axial cutting depth affects milling force significantly, followed by feed per tooth and radial cutting depth has little influence on it. Two types of empirical model of milling force were established by the result of orthogonal experiment and multiple linear regression analysis. It was verified that both (h_m, a_p) model and (h_m, a_p, a_e) model had good prediction accuracy compared with the experimental data. By calculating specific cutting force using the (h_m, a_p) model, a modified coefficient of the specific cutting force for 1mm² chip cross section was proposed. The study would provide guidance to improve the machining precision and machining efficiency of high temperature alloy materials.

Abstract: The machinability of Titanium alloy Ti6Al4V is poor, so the new green cutting technology with water vapor and ionized air as coolants and lubricants was proposed to achieve the aim of efficient and green cutting for Ti6Al4V. In this paper, the milling formation and milling force were studied in machining Ti6Al4V with application of ionized air and water vapor for cooling lubricants. A set of milling tests using carbide tool YG6 were performed under dry cutting, oil emulsion, water vapor and ionized air, respectively. The results of tests indicated that the milling formation was decreased with increasing feed per tooth and the milling force increased with increasing feed per tooth, the milling formation and milling force were reduced during water vapor and ionized air condition.

Abstract: Industrial robots are used for many tasks, mainly for material handling, welding and cutting. Robots can be also equipped with other tools for example drill or mill cutter and used for machining. Compared to conventional machines, robots have some advantages, which are: large range, flexibility and speed. On the other hand the greater disadvantage is small stiffness of robotic arms. Also the precision of robot positioning is smaller than modern CNC machines. Nowadays small number of robots are used mainly for machining of soft materials, such as plastic, wood, foam and aluminium. We have also executed some experiments with robot machining including styrodur milling. This technique is similar to rapid prototyping technics. Obtained parts can be used as prototypes. Robots can be used also for machining of hard materials and steel, but that is related with greater cutting force. Thanks they flexibility robots can be used for tasks that are performed by hand by locksmiths. An example of deburring and chamfering of sharp edges were analysed. The burrs and sharp edges that remains after some machining operations must be removed. In most cases that is done by chamfering the edges with hand tools. That tasks requires skilled workers and is physically exhausting and therefore industrial robots can be used to perform that work. But the first problem is prediction of cutting force and selection of proper robot with adequate payload. A mechanistic model of cutting force during milling a chamfer on the edge is presented in the article. Obtained results are similar with other experimental results that are described in the analysed bibliography. Afterwards a methodology for robot selection is explained. Because robot manufacturers give only data for static payload of robot arm, there must be a way to take into account the dynamic cutting force. Some problems that are possible during robot machining are discussed, and some solution are proposed. Because milling force is not constant and still subsequently changes value and direction, it can be the source of vibration. Small stiffness of robot arm combined with vibrations can caused losing of robot position and improper surface after machining. Other problem can be robot programming for machining of curved surfaces in 3 dimensional space. There are same CAM system that can be used for that purpose. Results obtained with developed model can be used for design of robotic cell for chamfering and milling.   Normal 0 21 false false false PL X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:Standardowy; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman","serif";}

Abstract: NC milling plays an important role in machining. With the continuous development of modern manufacturing technology, carrying out a series of in-depth study of NC milling physical simulation is necessary. On the one hand, we performed a GUI of physical simulation with MATLAB to obtain the forecasting values of milling force and surface roughness when specified parameter is input, on the other hand, according to the forecasting values, the chosen parameter value can be adjusted appropriately. Thus, bi-direction optimized selection is achieved.

Abstract: TC21 is a first high strength and damage-tolerant titanium alloy self-developed in China, which has independent intellectual property. As it is known to all, titanium alloy TC21 is widely used in aviation and aerospace fields. The experimental study of cutting force is a important content of machining mechanism about TC21. In this paper, the orthogonal experiment were carried out to study. The predictive model of milling force in milling TC21 was built by analysis of multivariable linear regression on the basis of experiment. Statistical test results indicated the established predictive model were in highly notable test status and had high reliability.

Abstract: Improving the machining precision mechanical manufacturing field is an indispensable chapter topic. In this analysis focuses on the rail straightness, process system stiffness, milling way, cutting layer parameters, tool wear, thermal deformation of the workpiece spindle axis traverse peace pliers jaws of irregularities in the machining precision flatness influence. Milling cutting process parameters of different layers, different milling heat, different deformation of the workpiece, resulting flatness error is different. Different milling methods and different milling force also affect flatness errors. Therefore, the workpiece machining pass these factors need to be considered. And proposed a solution for uneven of flat-nose pliers jaws and surface of workpiece.

Abstract: Based on actual working condition, this paper takes the mold materials Cr12MoVwhich is widely used in car cover as research object, and uses the finite element software Deform 3D to establish three-dimensional finite element simulation model of milling hardened steel Cr12MoV process. Reliable material model, chip separation criterion and appropriate boundary conditions are applied. The finite element simulation of milling hardened steel is built with different tilt angles. Milling force of simulation results are verified through experiments.Changes in the milling force with tilt angle are discussed, which can provide certain reference for cutting parameters optimization of milling process and 3D finite element modelling in milling.

Abstract: Most large covering parts mold use panel board type joining together of hardened steel. The vibration and the milling force is more bigger when milling process the spell near joint. They affect spell near joint processing quality. Analyze of the dynamic milling force, vibration surface morphology change of the sensitivity of the joining together with the cross-correlation function for analyzing the sensitivity of the dynamic milling force of mold spell near joint surface morphology. Experimental study shows that the dynamic milling force and the surface morphology characteristic curve cross-correlation function absolute value can reach 0.952 when the tool path and splice joints into 90°.And the cross-correlation function absolute value of milling force and the surface morphology characteristic is larger than vibration signal one. When the tool path and the joint Angle is small, the milling force influence on the surface morphology is lesser, so process should try to choose the smaller Angle seam.

Abstract: Consider to the properties of Super Alloy GH4169, planning the milling experiment with ceramic cutting tool, which is aimed at studying the milling force of different parameters in each direction based on the software of Labview and KISTLER three-component dynamometer. Then the milling force experience formula was established by MatLab, which offered the theoretic reference to the studies of high speed milling super alloy GH4169 through the analysis and studies of the milling parameters based on the experimental data.