共查询到20条相似文献,搜索用时 0 毫秒
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Ik Soo Kang Jeong Suk Kim Yong Wie Seo Jeon Ha Kim 《Journal of Mechanical Science and Technology》2006,20(2):227-233
Engineering ceramics have many unique characteristics both in mechanical and physical properties such as high temperature
hardness, high thermal, chemical and electrical resistance. However, its machinability is very poor in conventional machining
due to its high hardness and severe tool wear. In the current experimental study, alumina (Al2O3) was ultrasonically machined using SiC abrasives under various machining conditions to investigate the material removal rate
and surface quality of the machined samples. Under the applied amplitude of 0.02 mm, 27 kHz frequency, three slurry ratios
of 1:1, 1:3 and 1:5 with different tool shapes and applied static pressure levels, the machining was conducted. Using the
mesh number of 240 abrasive, slurry ratio of 1:1 and static pressure of 2.5 kg/cm2, maximum material removal rate of 18.97 mm3/min was achieved. With mesh number of 600 SiC abrasives and static pressure of 3.0 kg/cm2, best surface roughness of 0.76 pm Ra was obtained. 相似文献
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The applicability of a cyclized polybutadiene rubber as a resist material for photoetching of alumina ceramic in phosphoric acid was studied. Stencil breakdown, change in the stencil thickness during etching, and etch factor were measured. It was found that this material post-baked at temperatures as high as 300°C for 30 min provided good resistance to severe attack by the acid at temperatures of up to 300°C. The effects of post-bake temperature, of etching temperature, of etching time, and of original slot width on etch factor are discussed. 相似文献
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Guo-Dong Li Shiro Masuda Daisuke Yamaguchi Masatake Nagai Chen-Hong Wang 《The International Journal of Advanced Manufacturing Technology》2009,43(5-6):529-537
The machining accuracy prediction has been widely studied in many manufacturing processes to achieve efficient control for production process. In this paper, a dynamic analysis model is proposed to develop the prediction model of machining accuracy. The dynamic analysis model has the advantage of high predictable power of the GM(1,1) model while at the same time utilizing the prediction power of the Markov chain model from stochastic process theory. Furthermore, Taylor approximation method is employed to enhance the prediction accuracy. The effectiveness of the proposed model is validated with a real case. 相似文献
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Palamandadige Kasun Shashika Chathuranga Fernando Zhijian Pei 《Machining Science and Technology》2019,23(4):595-611
Rotary ultrasonic machining (RUM) is a hybrid machining process that combines the material removal mechanisms of grinding and ultrasonic machining. RUM has been applied to hole-making for a wide range of materials. It is known that ultrasonic vibration amplitude has significant effects on cutting force, torque, and surface finish in RUM. One experimental observation that has been reported in the literature multiple times states that different tools show different vibration amplitudes on the same ultrasonic power level. However, no analyses can be found in the literature to explain this observation. The existence of this knowledge gap makes it difficult to explain some experimentally obtained trends or to conduct more realistic physics-based modeling work. The objectives of this research are to understand the effects of tool natural frequency on ultrasonic vibration amplitude in RUM, to provide an explanation to the observation and verification of measurement methods, and also to guide tool design and selection in RUM. Ultrasonic vibration amplitudes of tools are measured by three methods and compared. It is found that tool natural frequency significantly affects ultrasonic vibration amplitude. The tool with its natural frequency closest to that of the ultrasonic power supply (20?kHz) generates the highest ultrasonic vibration amplitude on every ultrasonic power level tested. 相似文献
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In our investigation, the effects of the tribochemically-induced dissolution of alumina ceramics and modulation of near-surface forces (surface charge) within the tribocontact were studied. The wear and friction behaviors of alumina were investigated using a reciprocating sliding test in different chemical environments. The samples for the tests were hemispherical pins and plates of polished alumina, both prepared by a near-net-shaping method.
The sliding tests were conducted in water-based liquids with different pH values or with the addition of a polyelectrolyte to control the surface charge at solid surfaces. The coefficient of friction was continuously recorded during the tests and the wear-loss was subsequently determined for all samples. The results show a significant effect of the chemical agents on the coefficient of friction as well as on the material-removal rate in different aqueous media. The results are discussed in terms of the chemical and electrochemical properties of the materials in the tribocontact. 相似文献
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An ultrasonic self-calibrating technique for the characterization of a ceramic which was fabricated by change pressing time
during the HIP process has been applied by using the ratio of the reflection and transmission coefficients of normal incidence
longitudinal waves. The ratio is self-compensated, in that it is independent of the characteristics for transmission and reception
of ultrasound by the transducer and the condition of the couplant. The insensitive direction in parameter space is defined
as the direction in which the variation of the ratio to changes of two parameters vanishes. For inverse problem the distribution
of minima in an error surface is investigated. 相似文献
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Free abrasive wire saw machining of ceramics 总被引:1,自引:1,他引:0
C. Y. Hsu C. S. Chen C. C. Tsao 《The International Journal of Advanced Manufacturing Technology》2009,40(5-6):503-511
Currently, many kinds of ceramics are used in advanced industrial fields due to their superior mechanical properties, such as thermal, wear, corrosion resistance, and lightweight features. Wire saw machining ceramic (Al2O3) was investigated by ultrasonic vibration in this study. Taguchi approach is a powerful design tool for high-quality systems. Material removal rate, wafer surface roughness, steel wire wear, kerf width, and flatness during machining ceramic were selected as quality character factors to optimize the machining parameters (swinging angle, concentration, mixed grain and direction of ultrasonic vibration) to get the larger-the-better (material removal rate) and the smaller-the-better (wafer surface roughness, steel wire wear, kerf width and flatness) machining characteristics by Taguchi method. The results indicated that wire swinging produces a higher material removal rate and good wafer surface roughness. Ultrasonic vibration improved material removal rate, without affecting the flatness under different machining conditions. Experimental results show that the optimal wire saw machining parameters based on grey relational analysis can be determined effectively and material removal rate increases from 2.972 to 3.324 mm2/min, wafer surface roughness decreases from 0.37 to 0.34 μm, steel wire wear decreases from 0.78 to 0.77 μm, kerf width decreases from 0.352 to 0.350 mm, and flatness decreases from 7.51 to 7.22 μm are observed. 相似文献
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S. M. Petrov G. K. Davletshina B. F. Zairov L. F. Zairov 《Russian Engineering Research》2017,37(8):728-729
A method is proposed for determining the cutter profile of a mill. 相似文献
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The advanced ceramic cutting tools have very good wear resistance, high refractoriness, good mechanical strength and hot hardness. Alumina based ceramic cutting tools have very high abrasion resistance and hot hardness. Chemically they are more stable than high-speed steels and carbides, thus having less tendency to adhere to metals during machining and less tendency to form built-up edge. This results in good surface finish and dimensional accuracy in machining steels. In this paper wear behaviour of alumina based ceramic cutting tools is investigated. The machining tests were conducted using SiC whisker reinforced alumina ceramic cutting tool and Ti[C,N] mixed alumina ceramic cutting tool on martensitic stainless steel-grade 410 and EN 24 steel work pieces. Flank wear in Ti[C,N] mixed alumina ceramic cutting tool is lower than that of the SiC whisker reinforced alumina cutting tool. SiC whisker reinforced alumina cutting tool exhibits poor crater wear resistance while machining. Notch wear in SiC whisker reinforced alumina cutting tool is lower than that of the Ti[C,N] mixed alumina ceramic cutting tool. The flank wear, crater wear and notch wear are higher on machining martensitic stainless steel than on machining hardened steel. In summary Ti[C,N] mixed alumina cutting tool performs better than SiC whisker reinforced alumina cutting tool on machining martensitic stainless steel. 相似文献
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B.R. Sarkar B. Doloi B. Bhattacharyya 《The International Journal of Advanced Manufacturing Technology》2006,28(9):873-881
The electrochemical discharge machining (ECDM) process has a potential in the machining of silicon nitride ceramics. This
paper describes the development of a second order, non-linear mathematical model for establishing the relationship among machining
parameters, such as applied voltage, electrolyte concentration and inter-electrode gap, with the dominant machining process
criteria, namely material removal rate (MRR), radial overcut (ROC) and thickness of heat affected zone (HAZ), during an ECDM
operation on silicon nitride. The model is developed based on response surface methodology (RSM) using the relevant experimental
data, which are obtained during an ECDM micro-drilling operation on silicon nitride ceramics. We also offer an analysis of
variance (ANOVA) and a confirmation test to verify the fit and adequacy of the developed mathematical models. From the parametric
analyses based on mathematical modelling, it can be recommended that applied voltage has more significant effects on MRR,
ROC and HAZ thickness during ECDM micro-drilling operation as compared to other machining parameters such as electrolyte concentration
and inter-electrode gap. 相似文献
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B. R. Sarkar B. Doloi B. Bhattacharyya 《The International Journal of Advanced Manufacturing Technology》2006,28(9-10):873-881
The electrochemical discharge machining (ECDM) process has a potential in the machining of silicon nitride ceramics. This paper describes the development of a second order, non-linear mathematical model for establishing the relationship among machining parameters, such as applied voltage, electrolyte concentration and inter-electrode gap, with the dominant machining process criteria, namely material removal rate (MRR), radial overcut (ROC) and thickness of heat affected zone (HAZ), during an ECDM operation on silicon nitride. The model is developed based on response surface methodology (RSM) using the relevant experimental data, which are obtained during an ECDM micro-drilling operation on silicon nitride ceramics. We also offer an analysis of variance (ANOVA) and a confirmation test to verify the fit and adequacy of the developed mathematical models. From the parametric analyses based on mathematical modelling, it can be recommended that applied voltage has more significant effects on MRR, ROC and HAZ thickness during ECDM micro-drilling operation as compared to other machining parameters such as electrolyte concentration and inter-electrode gap. 相似文献
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为研究旋转超声电解复合加工小孔的成型过程,进行了旋转超声电解复合加工小孔试验,得到了不同加工时间孔的截面,并根据试验参数,进行了基于ANSYS的二维仿真加工和三维仿真加工。对小孔的入口直径、底面直径和加工深度进行了对比分析,结果表明由于三维仿真加工中采用了管电极,并考虑了电解加工中阴极超声高频振动对电解液电导率的影响,故其仿真结果更加接近试验值,间接证明了旋转超声电解复合加工小孔三维仿真加工的可靠性,展示了不同时刻的三维加工型腔,为旋转超声电解复合加工的成型过程和成型规律的研究提供了参考。 相似文献
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影响数控超声加工效率的相关因素分析 总被引:2,自引:1,他引:1
数控超声加工是利用类似数控铣削的方式实现三维加工的超声加工方法。探讨二维数控超声加工中工具移动速度、磨料粒度、静压力对超声加工效率的影响,运用灰色系统理论对这三个因素进行了灰关联分析,找出影响加工效率的主要影响因素和次要影响因素,为超声加工中参数的设置提供了依据。 相似文献