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Key engineering materials
Trans Tech Publications Ltd.
Key engineering materials

Trans Tech Publications Ltd.

半月刊

1013-9826

Key engineering materials/Journal Key engineering materials
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    Cutting Performance and Wear Mechanisms of an Al_2O_3-Based Micro-Nano-Composite Ceramic Tool

    Yonghui ZhouJun ZhaoXing Ai
    P.244-249页
    查看更多>>摘要：An Al_2O_3-based composite ceramic cutting tool material reinforced with (W, Ti)C micro-particles and Al_2O_3 micro-nano-particles was fabricated by using hot-pressing technique, the composite was denoted as AWT. The cutting performance, failure modes and mechanisms of the AWT micro-nano-composite ceramic tool were investigated via continuous turning of hardened AISI 1045 steel in comparison with those of an Al_2O_3/(W, Ti)C micro-composite ceramic tool SG-4 and a cemented carbide tool YS8. Worn and fractured surfaces of the cutting tools were characterized by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The results of continuous turning revealed that tool lifetime of the AWT ceramic tool was higher than that of the SG-4 and YS8 tools at all the tested cutting speeds. The longer tool life of the AWT composite ceramic tool was attributed to its synergistic strengthening/toughening mechanisms induced by the (W, Ti)C micro-particles and Al_2O_3 nano-particles.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Dry Turning of Rotor Steel 26NiCrMoV145 Using Multilayer Coated Cemented Carbide Tools

    Guoqiang GuoJunli LiQinglong AnMing Chen...
    P.250-255页
    查看更多>>摘要：Rotor steel 26NiCrMoV145 has been widely employed in aerospace and power industry because of its unique properties. As to this new material that used widely in important places, it is worth studying its machinability. An experiment was carried out to study the cutting forces and tool wear mechanism during high speed dry turning using multilayer Al_2O_3 coated carbide insert. The orthogonal test was chosen, cutting forces were measured. SEM analysis has been carried out on worn tools to determine the tool wear mechanisms. Crater wear and coating peeling could be found in every cutting speed. Flank face wear appears smooth when cutting speed increases. At last, an optimization of the cutting condition was suggested when considering of material remove rate, cutting forces and tool wear.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Experimental Study on the Performance of WC-Co Inserts in Turning 4Cr13 Die Steel

    Qiulin NiuQinglong AnMing ChenGang Liu...
    P.256-261页
    查看更多>>摘要：These years, the mold has become a very important forming tool in modern industry. And the die steel is the most important technical and material base in mold industry. To obtain the optimized cutting parameters, this paper introduced the cutting performance of WC-Co carbide cutting tools (P10) from cutting force, the surface roughness, chip deformation and the chip-breaking performance in turning 4Cr13 die steel. And the cutting parameters were optimized by homogeneous design method and multiple linear regression analysis method in this paper. The regression models on cutting forces and surface roughness with the cutting parameters were studied and taken the tests of significance. The result showed that it was more suitable for finish turning 4Cr13 die steel using WC-Co carbide tools at v_c =183.3m/min, f=0.2mm/r, a_p=0.75mm or v_c =200m/min, f=0.1mm/r, a_p=1mm.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Experimental Study on Cutting Characteristics for Buttress Thread Turning of 13%Cr Stainless Steel

    Q.L. AnG.Q. GuoX.H. ZhengM. Chen...
    P.262-267页
    查看更多>>摘要：13%Cr stainless steel has good comprehensive performance, which makes it suitable to work under the condition of high temperature, high pressure and corrosive environment, such as petroleum industry. It can be used as materials of petroleum pipes with buttress thread. Buttress thread turning is a heavy-load machining, which places high requirement on the cutting tool. Based on the cutting characteristics of buttress thread, the machinability of 13%Cr stainless steel is studied by turning experiments. Two kinds of inserts with different geometries were employed in buttress thread turning experiments. Experimental results show that less cutting force, longer tool life, better chip curling effect and surface quality was acquired for the insert with rake angle of 12° , clearance angle of 3° and chip-curling groove during 13%Cr stainless steel buttress thread turning process.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Investigation of Cutting Forces and Vibration in High Speed Milling of Pocket Corner

    Dewen TangChengyong WangYingning HuYuexian Song...
    P.268-273页
    查看更多>>摘要：High speed milling hardened mould steel (above HRC50) at pocket corner generates the cutting forces increase and vibration gets fiercely because of the sudden change of cutting direction. It will cause serious wear and possible breakage of cutting tool, and poor quality of parts. Hence, the need to select reasonable cutting parameters and adopt appropriate cutting strategies will help them to achieve their goal. In this paper, the effects cutting parameters including cutting speed, pocket corner angle, feed rate per tooth and radial depth of cut on cutting force and vibration are studied. The results show that sharper pocket corner results in the increase of cutting force and makes vibration strong. Cutting force increase with the increase of cutting speeding, feed per tooth and radial depth of cut. The optimum of cutting speed leads to the decrease of vibration. It is proposed that cutting parameters should be optimized to improve tool life and processing efficiency.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Finite Element Simulation of Chip Formation during High-Speed Peripheral Milling of Hardened Mold Steel

    Dewen TangChengyong WangYingning HuYuexian Song...
    P.274-278页
    查看更多>>摘要：The modeling and simulation of chip formation during high speed milling of hardened mold steel are systematically studied by the Finite Element Analysis (FEA). The modified Johnson-Cook's constitutive equation for hardened mold steel is introduced. Comparing to the experimental results, the simulated results of cutting force, chip morphology, effective stress and cutting temperature in deformation zones of high speed peripheral milling indicate good consistence and the models established can be used to accurately predict the behavior of hardened mold steel.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Fast Tool Servo Machining of Complex Surfaces and Microstructures

    Guilin WangZiwen ZhengHaikuan YangYifan Dai...
    P.279-284页
    查看更多>>摘要：Optical components with complex surfaces or microstructures are more and more widely used, but it is very difficult to manufacture these components by using traditional mechanical fabrication methods. Fast Tool Servo (FTS) system driven by piezoelectric ceramic (PZT) can manufacture these complex surfaces or microstructures efficiently and accurately, owing to its high response frequency, good dynamic performances and high stiffness. In this paper, the cutting characteristics are studied in the FTS machining process, and the identifying algorithm of tool interference is given. A set of high-powered FTS system is developed, which consists of PZT, fast feeding device, DSP28335 control panel and ultraprecision machine tool. The testing results indicate that the FTS system's motion resolution is lnm, the stroke is 90μm, and the response frequency is 220Hz while moving distance is 36μm. On the basis of above work, three kinds of typical workpieces with complex surfaces are manufactured by using FTS system. The measuring results indicate that surface accuracy can reach PV 0.14μm, the roughness is less than Ra 12nm, and the means are presented to improve the machining accuracy.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Simulation and Optimal Selection of Pitch Angles Distribution for Variable Pitch Angles Helix End Mills

    Panling HuangJianfeng LiJie Sun
    P.285-290页
    查看更多>>摘要：In the paper, a static milling force model for variable pitch mills was built, and the milling forces were simulated. The resultant force and its frequency spectra of variable pitch mills were analyzed compared with that of uniform pitch mills. It is shown that the standard deviation (SD) of frequency spectra amplitudes for variable pitch mills is extremely lower than that of uniform pitch mills. Through simulation for SD of frequency spectra amplitudes affected by the different cutting parameters, a pitch angles distribution of variable pitch helix end mills with lower SD of frequency spectra amplitudes was selected.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Structure Optimization of Variable Pitch Helix End Mills Based on FEM Simulation

    Panling HuangJianfeng LiJie Sun
    P.291-296页
    查看更多>>摘要：Chatter is one of the main factors that affects the manufacturing quality and limits the productivity during milling. If properly selecting mills with variable pitch distribution, the chatter may be reduced. If mills have sufficient rigidity, its vibration resistance will be improved extremely. The paper summarizes the effects of helix angles, pitch angles distribution on the maximum stress, the maximum strain based on FEM simulation, the result of simulation can offer theoretical instructions to optimize and select the optimal mills based on intensity and rigidity.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Identification of Stability Lobes in High-Speed Milling Flexible Parts with Bull-Nose End Mills

    Yi WanQinghua SongZhanqiang Liu
    P.297-301页
    查看更多>>摘要：Flexible parts such as turbine blade, blisk and monolithic components are widely used in the aeronautical industry, and high Speed Machining (HSM) technology is used to increase productivity and reduce production costs. Chatter is an undesirable phenomenon in high speed machining processes because of deteriorative surface finish, early cutting tool failure and unexpected machine tool damage. It can be avoided in higher speed milling processes if stability lobes is determined. In this paper, a non-linear regenerative force model is applied to a bull-nose tool geometry in order to obtain the machine operation stability lobes. An analytical-experimental method is proposed to obtain the stability lobes during high speed milling flexible parts with bull-nose end mills. The method is calculated and validated.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd