Papers by Keyword: Cutting Force

Abstract: This study introduces rotary ultrasonic face milling (RUFM) process into flat surface machining of K9 glass. The effective cutting velocity, and cutting length of single diamond particle were presented in RUFM. The model of material removal for RUFM was developed through examining indentation fracture mechanics theory and material removal characteristics of brittle materials, and analyzing kinematics properties of diamond grits in RUFM. With a view of comparative researches, the cutting force of RUFM and diamond milling of K9 glass are compared. The experimental results tell that the relationship between the cutting depth (dc) and the ultrasonic amplitude (A) of the cutter has remarkable effects on cutting force, which was also discussed in the kinematic characteristics analysis section. The results also show that RUFM process can significantly reduce cutting force and the effects of process variable changes on cutting force in RUFM are weaker as dc is smaller than A. However, the reduction trends of the cutting forces in RUFM are very small and even increased in some process conditions, as dc is larger than A. It suggests that the cutting depth should be smaller than the ultrasonic amplitude of the cutter with RUFM process to obtain better processing performance.

Abstract: The main task is to study the CNC lathe cutting force signal on-line monitoring system design, it mainly includes the cutting force signal acquisition, real-time monitoring and subsequent processing and analysis. Cutting force signal acquisition is the use of Kistler piezoelectric sensor signal, converted into voltage signal, and through the data acquisition board, to convert analog signals into digital signals, input to the computer, the computer real-time monitoring of machining process. Signal processing is to the acquisition of signal processing and analysis, to obtain the correct dynamic cutting force signal, to verify the stability and reliability of the whole monitoring system.

Abstract: Use the piezoelectronic sensor to test the signal then use the charge amplifier to amplify it,after several amplification ,the weak charge signal is amplified into voltage signal,after that convert the analog signal into dagital signal by the data acquisition board,then input the data into a computer,signal real-time collection and dynamic display can be achieved on the computer.Signal processing process disposes and analyzes the collected signal further,at last obtains the right cutting force signal dynamically,thus it can be used to test the monitoring system's stability and reliability

Abstract: In this study, orthogonal turning experiments are performed to analyze the machinability of Ti-5Al-2Sn-2Zr-4Mo-4Cr (Ti-17), a β-rich, α+β type alloy. PVD TiAlN coated carbide tool inserts are applied, because they are used widely for machining this material. The cutting forces and cutting temperatures are examined under different cutting conditions, which the cutting speeds are varied from 44m/min to 123m/min, the feed rates are 0.06mm/r, 0.08mm/r, 0.10mm/r and 0.12mm/r,respectively.There are some different varying trends of both the cutting force and the thrust force with the change of cutting speed. The cutting temperatures are found to increase with cutting speeds as well as feed rates.

Abstract: Bone drilling is widely used in orthopedics and dental surgery; it is a technically surgical procedure. Recent technological improvements in this area are focused on efforts to reduce forces in bone drilling. The aim of this study was to compare changes in cutting force during dental bone drilling at various drilling conditions and drill tool geometry. In the present in vitro study, dog jaw bone with uniform thickness of cortical bone was used. Cutting force changes were measured during drilling process. Drill jig was designed and manufactured to fix jaw workpiece and mounted on the tool dynamometer to measure cutting force in drilling process. The dental implant drilling tests were conducted at various cutting speeds and feed rates. In this study drilling thrust force was observed 1.5~3.6[N] for MS type implant drilling and 3.1~4.9[N] for conventional high speed steel drilling, respectively. This further research will provide a basic quantitative approach for the timely issue of wide application of implant drilling in dental and orthopedic surgery fields.

Abstract: In the cylinder of a sleeveless engine, molten iron-based alloy is directly sprayed onto the aluminum engine block instead of the previously used cast iron cylinder liner. However, a thermal spraying cylinder liner exhibits poor machining performance during the finish boring process because of severe tool wear. This research investigates the finish boring performance of a thermal spraying cylinder liner to clarify the root cause of tool wear. The results show that mechanical wear is a dominant effect.

Abstract: Nowadays composite materials are used in many industrial areas. The main application of these is the aircraft industry. Problematic points with machining of composite materials are tool wear, tool life, delamination and temperature during machining of polymer composite materials. Paper focuses on investigation of delamination at drilling of glass fibre reinforced composites. Experiments were planned on the base so called design of experiment - DOE. We observed the evolution of delamination at investigations, when we combined 4 different variables (vc, fz, tool, cooling system). We investigated the evolution of force relations, torques, dimensional and shape accuracy, considering on delamination. We processed results statistically, for processing we used software MINITAB and MATLAB. We summarized results in tables and graphs.

Abstract: SiC ceramics is very promising to be widely applied due to the excellent physical and chemical properties.However, the very difficult process of SiC ceramics hinders its application. In this paper, the nano-cutting of SiC ceramics is simulated based on molecular dynamics. The influences of the tool rake and cutting depth on the cutting force, the kinetic energy and potential are analyzed. The results show that the cutting force, system kinetic energy and potential energy increase firstly,reach the maximum, and then decrease in the process; with the increase of the tool rake, the cutting force and the kinetic energy decrease; with the increase of the cutting depth, the cutting force increases, and the kinetic energy and the potential energy decreases. These results are very helpful to understanding the process mechanism of SiC ceramics and increasing its process efficiency

Abstract: The influence of negative chamfers of PCBN milling cutters on cutting process of high speed cutting is studied based on finite element analysis. The milling speed, axial cutting depth and feed speed are all set fixed, while the negative chamfer angle varies. Cutting tool stress, deformation force, and cutting temperature are obtained for cutting process under different negative chamfering Angle,thus providing basis for the selection of tool parameters in practical production.

Abstract: The paper presents a predictive cutting force model in drilling of anisotropic materials. Three dimensional chip flow in drilling is interpreted as a piling up of the orthogonal cuttings in the planes containing the cutting velocities and the chip flow velocities. The cutting models in the chip flow are determined to calculate the cutting energy using the orthogonal cutting data. Then, the chip flow direction is determined to minimize the cutting energy. The cutting force can be predicted in the determined chip flow model. The cutting force with anisotropy in the material is modeled as the change in the shear stress on the shear plane. The shear stress changes with the rotation angle of the cutter. The cutting force prediction is verified in drilling of a titanium alloy. The anisotropic parameters are identified to minimize the model error between the measured and the predicted cutting forces. The periodical oscillation of the cutting force is also predicted by anisotropy in the shear stress.