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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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    Effect of MQL Liquids on Surface Integrity when High Speed Drilling Titanium Alloy

    Erween Abd. RahimHiroyuki Sasahara
    P.359-364页
    查看更多>>摘要：This paper describes the results of application of different MQL liquids (synthetic ester and palm oil) to high speed drilling of Ti-6Al-4V. The investigation was focused on the surface integrity of the machined surface. It was found that palm oil could be a viable alternative to the synthetic ester for MQL liquid application.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Surface Integrity when Drilling Nickel-Based Superalloy under MQL Supply

    Erween Abd. RahimHiroyuki Sasahara
    P.365-370页
    查看更多>>摘要：The components being manufactured in aerospace industry must be capable of being utilized for long periods without failure. Thus, the functional behavior of these machined components is greatly dependent upon their surface integrity. The present work compares the performance of palm oil and synthetic ester on surface integrity when drilling of Inconel 718. The results indicate the substantial benefit of MQL by palm oil on microhardness, surface roughness, surface defects and sub-surface deformation.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Tool Wear Performance of CVD-Insert during Machining of Ti-6%Al-4%V ELI at High Cutting Speed

    Gusri Akhyar IbrahimChe Hassan Che HaronJaharah Abd. Ghani
    P.371-375页
    查看更多>>摘要：Machining of titanium alloys as aerospace material that has extremely strength to weight ratio and resistant to corrosion at high-elevated temperature, become more interested topic. However, titanium alloys have low thermal conductivity, relative low modulus elasticity and high chemical reactivity with many cutting tool materials. The turning parameters evaluated are cutting speed (55, 75, 95 m/min), feed rate (0.15, 0.25, 0.35 mm/rev), depth of cut (0.10, 0.15, 0.20 mm) and tool grade of CVD carbide tool. The results that pattern of tool life progression is rapidly increase at the initial stage. It was due to small contact area between the cutting tool and the workpiece. At the first step of machining, the chip welded at the cutting edge but some chip removed away from the cutting edge. Wear mechanism produced are abrasive wear, adhesive, flaking, chipping at the cutting edge and coating delamination.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Intelligent Monitoring and Estimation of Surface Roughness on CNC Turning

    Somkiat Tangjitsitcharoen
    P.376-381页
    查看更多>>摘要：In order to realize an intelligent machine tool, an in-process monitoring system is developed to estimate the in-process surface roughness. The objective of this research is to propose a method to estimate the surface roughness during the in-process cutting by utilizing the in-process monitoring of cutting forces. The proposed in-process surface roughness model is developed based on the experimentally obtained results by employing the exponential function with five factors of the cutting speed, the feed rate, the tool nose radius, the depth of cut, and the cutting force ratio. The multiple regression analysis is utilized to calculate the regression coefficients with the use of the least square method. The prediction interval of the in-process surface roughness model has been also presented to monitor and control the in-process estimated surface roughness at 95% confident level. It is proved by the cutting tests that the proposed and developed in-process surface roughness model can be effectively used to monitor and estimate the in-process surface roughness by utilizing the cutting force ratio with the highly acceptable prediction accuracy achieved.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Monitoring of Cutting Conditions with Dry Cutting on CNC Turning Machine

    Somkiat TangjitsitcharoenSuthas Ratanakuakangwan
    P.382-387页
    查看更多>>摘要：This paper presents the additional work of the previous research in order to verify the previously obtained cutting condition by using the different cutting tool geometries. The effects of the cutting conditions with the dry cutting are monitored to obtain the proper cutting condition for the plain carbon steel with the coated carbide tool based on the consideration of the surface roughness and the tool life. The dynamometer is employed and installed on the turret of CNC turning machine to measure the in-process cutting forces. The in-process cutting forces are used to analyze the cutting temperature, the tool wear and the surface roughness. The experimentally obtained results show that the surface roughness and the tool wear can be well explained by the in-process cutting forces. Referring to the criteria, the experimentally obtained proper cutting condition is the same with the previous research except the rake angle and the tool nose radius.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Understanding the Temperature Field in Plunge Cylindrical Grinding for Grinding-Hardening

    T. NguyenL.C. Zhang
    P.388-393页
    查看更多>>摘要：This paper investigates the temperature field in plunge cylindrical grinding with the aid of the finite element analysis. The analysis included the effect of the variation of the depth of cut and that of the repeated heating and cooling caused by workpiece rotation. It was found that the predictions agree well with the experimentally measured results. The analysis showed that the heating in the consequent rotations further raises the temperature in the workpiece. The reheating in the hardened layer can lead to material's tempering.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Study on Grind-Hardening Temperature Field Based on Infrared Temperature Measurement and Numerical Simulation

    Zhenguo ZhangPeiqi GeLei ZhangMaocheng Tian...
    P.394-399页
    查看更多>>摘要：Based on the method of the statistical probability, the theory forecasting model of grinding force is modified analytically. The calculated force is used as an input factor to calculate the heat flux. Then the transient grinding temperature field is simulated using the finite element analysis (FEA). An infrared imaging system for a full area temperature measurement is used to validate the numerical model. Additionally, the experimental results are synthesized with the simulation results to analyze the temperature field and the hardness penetration depth (HPD). The distribution of the temperature field and the stability of the grind-hardening process are discussed, which could provide a reliable forecasting method for optimizing the grind process and controlling the hardening effects forwardly.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Phase Transformation and Stress Distribution in Polished PCD Composites

    Yiqing ChenL.C. Zhang
    P.400-405页
    查看更多>>摘要：With the aid of the Raman spectroscopy, this paper investigates the phase transformation and residual stress distribution in surfaces of polycrystalline diamond composites polished by dynamic friction technique. To clarify the contribution of phase transformations to residual stresses, the study focused on the surface which was incompletely polished such that the transformed phases remained. It was found that amorphous non-diamond carbon and amorphous graphite phase appeared in grain boundaries, but pristine diamond phase was predominant within gain areas. The residual stresses vary across the polished surfaces and the maximum stress locates at the grain boundaries.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Influence of Magnetic Field Strength on Polishing Effect of the Tiny-Grinding Wheel Cluster Based on the Magnetorheological Effect

    Jiewen YanQiusheng YanJiabin LuWeiqiang Gao...
    P.406-410页
    查看更多>>摘要：A new tiny-grinding wheel cluster polishing method based on the Magnetorheological (MR) effect is presented to polish optical glass in this paper and some process experiments were conducted to reveal the influence of magnetic field strength, the content of carbonyl iron in the MR fluid and the speed of polishing disc on the material removal rate and the surface roughness of the glass workpiece. The results indicate that when the external magnetic field is applied, the material removal rate of the workpiece improves rapidly but the surface roughness increases slightly. When the Magnetic field strength is 100 Gs and the content of carbonyl iron is 3.5%, the material removal rate improves by a factor of 16.8% compared with that of the conventional polishing methods with dissociative abrasive particles, while the surface roughness of the workpiece increases unobviously.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Study on NC Compliant Bonnet Tool Abrasive Polishing Based on Magnetorheological Torque Servo

    Yongjie ShiDi ZhengJianming ZhanLongshan Wang...
    P.411-416页
    查看更多>>摘要：In this paper, a NC compliant abrasive polishing system was developed based on a magnetorheological torque servo (MRT), using a bonnet as the polishing tool. The MRT was uesd to provide a load acting on bonnet tool to produce the polishing force. In order to find the factors affecting the polishing quality, the models of the applied load, polishing force and contact pressure between the bonnet and the part were established based on Hertz theory, and the factors affecting the contact pressure were analyzed. Theoretical analysis indicated that there was a significant effect of the applied load, the initial pressure of the bonnet and the radius of curvature of the part on contact pressure. Experiments were carried out to verify the validity of the models, and experiment results showed that the roughness of the part was improved greatly and the polishing efficiency could be controlled by changing the initial pressure of the bonnet and applied load.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd