In this paper, a series of experiments were performed by high speed milling of Ti-6.5Al-2Zr-1Mo-1V (TA15) by use of polycrystalline diamond (PCD) tools. The characteristics of high speed machining (HSM) dynamic millin...In this paper, a series of experiments were performed by high speed milling of Ti-6.5Al-2Zr-1Mo-1V (TA15) by use of polycrystalline diamond (PCD) tools. The characteristics of high speed machining (HSM) dynamic milling forces were investi- gated. The effects of the parameters of the process, i.e., cutting speed, feed per tooth, and depth of axial cut, on cutting forces were studied. The cutting force signals under different cutting speed conditions and different cutting tool wear stages were analyzed by frequency spectrum analysis. The trend and frequency domain aspects of the dynamic forces were evaluated and discussed. The results indicate that a characteristic frequency in cutting force power spectrum does in fact exist. The amplitudes increase with the increase of cutting speed and tool wear level, which could be applied to the monitoring of the cutting process.展开更多
Press-finishing, a plastic deformation process, can be applied to raise surface precision of a workpiece. This paper introduces a new press-finishing technique for PCD (polycrystal diamond)tool that can press finishin...Press-finishing, a plastic deformation process, can be applied to raise surface precision of a workpiece. This paper introduces a new press-finishing technique for PCD (polycrystal diamond)tool that can press finishing the residual feed trails produced by the diamond tool on the machined surface. The experiments of press-finishing of Al-alloy have been performed on an instrument lathe with the press-finishing set-up with a PCD tool. Having investigated the correlation between the surface roughness (Rα)and parameters, such as press-finishing speed (v), feed (f),depth of press (αpp), PCD sphere diameter (Dsph), rigidity coefficient of spring (Ki) etc, the optimum parameters of technology.and their laws for the press-finishing of Al-alloy have been acquired. Some mechanisms for the press-finishing of Al-alloy with a PCD tool have been discussed. With appropriate parameters chosen, the sample of Al-alloy could be press-finished to a value of Ra =0.026μm from an initial roughness of Ra =0.5μm.展开更多
Based on the study of existing typical micro-milling tools and the actual demand for micro-milling tools, the P3 design principle and design flow for ultra-hard micro-milling tool were introduced to give basic guidanc...Based on the study of existing typical micro-milling tools and the actual demand for micro-milling tools, the P3 design principle and design flow for ultra-hard micro-milling tool were introduced to give basic guidance for the optimization of micro-milling tools. Then, according to the P3 design flow, the manufacturing process of polycrystalline diamond(PCD) micro-milling tool was proposed, and the PCD micro-milling tool with diameter of 0.5 mm was developed. Finally, the micro-milling test on the slot was carried out to study the milling performance of PCD micromilling tool.展开更多
基金Project (No.IRT0837) supported by the Program for Changjiang Scholars and Innovative Research Team in University of China
文摘In this paper, a series of experiments were performed by high speed milling of Ti-6.5Al-2Zr-1Mo-1V (TA15) by use of polycrystalline diamond (PCD) tools. The characteristics of high speed machining (HSM) dynamic milling forces were investi- gated. The effects of the parameters of the process, i.e., cutting speed, feed per tooth, and depth of axial cut, on cutting forces were studied. The cutting force signals under different cutting speed conditions and different cutting tool wear stages were analyzed by frequency spectrum analysis. The trend and frequency domain aspects of the dynamic forces were evaluated and discussed. The results indicate that a characteristic frequency in cutting force power spectrum does in fact exist. The amplitudes increase with the increase of cutting speed and tool wear level, which could be applied to the monitoring of the cutting process.
文摘Press-finishing, a plastic deformation process, can be applied to raise surface precision of a workpiece. This paper introduces a new press-finishing technique for PCD (polycrystal diamond)tool that can press finishing the residual feed trails produced by the diamond tool on the machined surface. The experiments of press-finishing of Al-alloy have been performed on an instrument lathe with the press-finishing set-up with a PCD tool. Having investigated the correlation between the surface roughness (Rα)and parameters, such as press-finishing speed (v), feed (f),depth of press (αpp), PCD sphere diameter (Dsph), rigidity coefficient of spring (Ki) etc, the optimum parameters of technology.and their laws for the press-finishing of Al-alloy have been acquired. Some mechanisms for the press-finishing of Al-alloy with a PCD tool have been discussed. With appropriate parameters chosen, the sample of Al-alloy could be press-finished to a value of Ra =0.026μm from an initial roughness of Ra =0.5μm.
基金Supported by the National Natural Science Foundation of China(No.50935003)Science and Technology Support Project of Jiangsu Province,China(No.BE2012172)
文摘Based on the study of existing typical micro-milling tools and the actual demand for micro-milling tools, the P3 design principle and design flow for ultra-hard micro-milling tool were introduced to give basic guidance for the optimization of micro-milling tools. Then, according to the P3 design flow, the manufacturing process of polycrystalline diamond(PCD) micro-milling tool was proposed, and the PCD micro-milling tool with diameter of 0.5 mm was developed. Finally, the micro-milling test on the slot was carried out to study the milling performance of PCD micromilling tool.
