Gotowe bibliografie tematyczne / Specific grinding energy

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Gotowa bibliografia na temat „Specific grinding energy”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Specific grinding energy"

Apimakh Yauheni Vladimirovich. "PROMISINGDIRECTIONSOFREDUCING SPECIFIC ENERGY COSTSIN GRINDING". SERIES CHEMISTRY AND TECHNOLOGY 431, nr 5 (15.10.2018): 32–40. http://dx.doi.org/10.32014/2018.2518-1491.5.

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Azizi, Abdolhamid, Hamed Adibi, Seyed Mehdi Rezaei i Hamid Baseri. "Modeling of Specific Grinding Energy Based on Wheel Topography". Advanced Materials Research 325 (sierpień 2011): 72–78. http://dx.doi.org/10.4028/www.scientific.net/amr.325.72.

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Grinding performance is evaluated mainly in terms of specific grinding energy. The number of active grits per unit area and their slope is considered as the two grinding wheel topographical key parameters for studying grinding performance. To provide a view on how various parameters influence specific energy and the importance of wheel topography and grit workpiece interaction, a specific grinding energy model is developed. Inputs to this model are workpiece parameters, grinding process parameters, and, in particular, the grinding wheel topographical parameters. This model has been validated by experimental results. The theoretical values considering the complexity of the grinding process reasonably compare with the experimental results. The effect of number of active grits per unit area and their slope on specific grinding energy and then metal removal mechanism is investigated. The results revealed that the number of active grits per unit area has less effect on specific grinding energy than grits slope.

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Singh, Vijayender, P. Venkateswara Rao i S. Ghosh. "Development of specific grinding energy model". International Journal of Machine Tools and Manufacture 60 (wrzesień 2012): 1–13. http://dx.doi.org/10.1016/j.ijmachtools.2011.11.003.

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Spina, Roberto, Bruno Cavalcante, Marco Massari i Roberto Rutigliano. "Forces and Specific Energy of Polyamide Grinding". Materials 14, nr 17 (3.09.2021): 5041. http://dx.doi.org/10.3390/ma14175041.

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This work investigated the grinding process of reinforced and nonreinforced polyamide materials using an Al2O3 grinding wheel. Samples were ground using a custom-made setup of sensors to evaluate in-line temperature, forces, and power. The surface roughness and images were acquired to assess the quality of the final products. The novelty of the work is to correlate the energy evaluation with the process efficiency during processing. Grinding at high cutting depths achieves good surface quality indicators, such as Ra < 5 μm and Rz < 5 μm. Results also reveal that special attention should be given to the infeed speed when cutting unfilled materials to produce good results. With high values of energy partition, the specific grinding energy stabilizes around 60 J/mm³. Strains must be applied quickly because, to ensure the unfilled materials respond better at this cutting depth, the reinforced materials suffer a slight degradation of quality.

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Feng, Bao Fu, Hua Li Su, Quan Zhong Zhang, Lei Zheng, Quan Fang Gai i Guang Qi Cai. "Grinding Forces and Grinding Energy in High Speed Grinding for Quenched Steel". Key Engineering Materials 416 (wrzesień 2009): 504–8. http://dx.doi.org/10.4028/www.scientific.net/kem.416.504.

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Grinding experiments for quenched high-speed tool steel by resin bonded CBN (cubic boron nitride) wheel were conducted with a surface grinder. The grinding forces were measured under different grinding parameters. The effects of grinding parameters on grinding forces and grinding force ratio are discussed. Specific grinding energy and heat flux over the grinding zone are computed according to grinding parameters and grinding forces. The effects of grinding parameters on specific grinding energy and heat flux are investigated.

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Brach, K., D. M. Pai, E. Ratterman i M. C. Shaw. "Grinding Forces and Energy". Journal of Engineering for Industry 110, nr 1 (1.02.1988): 25–31. http://dx.doi.org/10.1115/1.3187838.

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Grinding forces and energy play an important role in all abrasive machining operations. While specific grinding energy may be obtained from workpiece dynamometer values or by measuring spindle power, care must be exercised in converting dynamometer reading into power consumed. This is particularly true for operations involving a large ratio of wheel depth of cut to wheel diameter or when the radial force on the wheel is large relative to the tangential component. Interpretation of workpiece dynamometer results are discussed and several specific examples are considered including the diamond sawing of granite and the creep feed grinding of metal.

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Niu, Qiu Lin, Guo Giang Guo, Xiao Jiang Cai, Zhi Qiang Liu i Ming Chen. "Analysis of Specific Energy of TC18 and TA19 Titanium Alloys in Surface Grinding". Advanced Materials Research 325 (sierpień 2011): 147–52. http://dx.doi.org/10.4028/www.scientific.net/amr.325.147.

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As two kinds of advanced titanium alloys, TC18 and TA19 were introduced in this paper. The machinabilities of TC18 and TA19 alloys were described in the grinding process. Grinding experiments were completed using green silicon carbide grinding wheel with the coarser 100 grit. Grinding forces and specific energy in surface grinding were investigated. And then, for studying the grinding characteristic, SEM images of the workpiece material were obtained. The results indicated that specific chip formation had the great effect on the mechanism of grinding TC18 and TA19 alloys, and the scratch was the main characteristic of surface grinding. TC18 alloy had the poor grinding performance compared to TA19 alloy.

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Pak, Abbas, i Amir Abdullah. "Creep-Feed Grinding of Tungsten Carbide by Using Resin-Bonded Nickel-Coated Diamond Wheel". Advanced Materials Research 325 (sierpień 2011): 165–70. http://dx.doi.org/10.4028/www.scientific.net/amr.325.165.

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Force and specific energy are important factors in all abrasive machining operations especially in creep-feed grinding of hard materials. They have a high influence on the wheel wear, grinding accuracy, grinding temperature and surface integrity. This paper investigates the effect of grinding technological parameters on grinding force and specific energy in up-cut creep-feed grinding of cemented tungsten carbide with 20% cobalt using a resin-bonded nickel-coated diamond wheel. It was observed that increase of feed rate resulted in grinding force increase and specific energy decrease. Increased wheel-peripheral speed resulted in minor decrease of grinding force and specific energy increase.

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Yu, Yi Qing, Yuan Li i Xi Peng Xu. "An Experimental Study of Specific Energy in Grinding Granite". Materials Science Forum 471-472 (grudzień 2004): 625–29. http://dx.doi.org/10.4028/www.scientific.net/msf.471-472.625.

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An investigation is reported of the characteristics of specific energy in grinding of granite using diamond abrasives. The effects of many parameters, such as the types of diamond tools, the types of abrasives, the properties of granite, the conditions of lubrication, and the working conditions of diamond tools, were studied. The power consumed in grinding was measured in order to obtain the specific energy, which is defined as the energy expended per unit volume of material removal. It is found that the specific energy for grinding of granite was closely related to the removal mechanisms of granite, the failure modes of diamonds and the interactions of the swarf with the applied fluid and bond matrix.

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Tso, Pei Lum, i Weng Hong Lin. "A Study on Grinding Brittle Material with Pattern-Dressed Wheel". Materials Science Forum 861 (lipiec 2016): 14–19. http://dx.doi.org/10.4028/www.scientific.net/msf.861.14.

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The high hardness of brittle materials always make it hard to machine with traditional grinding wheels. Conventionally a diamond grinding wheels was used to improve the poor processing capability. Usually the specific grinding energy had been used as an indicator of machinability. According to its definition, the specific grinding energy increases with the active contact area of the grinding wheel decreases. In other words, reducing the surface contact area of the grinding wheel can enhance the specific grinding energy effectively. Conditioning grooves on grinding wheels not only enhance the specific grinding energy, but also achieve the effect of reducing the heat dissipated during the grinding processes. With the proper selection parameters, the high cost of diamond grinding wheel may be replaced by less expensive conventional green carbon and aluminum oxide wheel. In this studies, the relationship between the surface topography of grinding wheels and the grinding capability of brittle materials was investigated. The results show that, the traditional grinding wheel dressing properly while the depth of cut less than 20μm with the rhombic pattern and the depth of cut more than 20μm with the groove-like pattern can grind the brittle materials as good as using diamond wheel.

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Rozprawy doktorskie na temat "Specific grinding energy"

Makgoale, Dineo Mokganyetji. "Effects of mill rotational speed on the batch grinding kinetics of a UG2 platinum ore". Diss., 2019. http://hdl.handle.net/10500/26498.

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In this study, the effect of speed was investigated on the breakage rate of UG2 platinum ore in a batch mill of 5 dm3 and 175 mm internal diameter. One size fraction method was carried out to perform the experiment. Five mono-sized fractions in the range of 1.180 mm to 0.212 mm separated by √2 series interval were prepared. The fractions were milled at different grinding times (0.5, 2, 4, 15 and 30 min) and three fractions of mill critical speed were considered (20%, 30%, and 40%). The target of critical speed below 50% was due to the need of lower energy consumption in milling processes. The selection and breakage function parameters were determined and compared for fractions of critical speed. First the grinding kinetics of the ore was determined and it was found that the material breaks in non-first order manner. Thereafter, effective mean rate of breakage was determined. It was found that the rate of breakage increased with increase of mill speed and optimum speed was not reached in the range of chosen mill speed fractions. Again the rate of breakage was plotted as a function of particle size, the optimum size was 0.8 mm when milling at 30% critical speed. As for 20% and 30% optimum size was not reached. The selection function parameters estimated at 30% critical speed were 𝑎0 = 0.04 min−1 , 𝛼 = 1.36, 𝜇 = 0.9 mm, and Λ = 3. Breakage function parameters were determined and was noticed that the material UG2 platinum ore is non-normalised, i.e. Φ value was changing from 0.25 to 0.90 depending on feed size and mill speed. The parameters 𝛽 and 𝛾 were constant at 7.3 and 1.17 respectively.
College of Science, Engineering and Technology
M. Tech. (Chemical Engineering)

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Części książek na temat "Specific grinding energy"

Phi-Trong, Hung, Trung Nguyen-Kien, Chung Luong-Hai i Son Truong-Hoanh. "The Effect of Microstructure and Nano Additive Lubrication on the Specific Grinding Energy and Surface Roughness in Ti-6Al-4V Grinding". W The AUN/SEED-Net Joint Regional Conference in Transportation, Energy, and Mechanical Manufacturing Engineering, 1023–32. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1968-8_87.

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Rowe, W. Brian. "Specific Energy". W Principles of Modern Grinding Technology, 329–39. Elsevier, 2009. http://dx.doi.org/10.1016/b978-0-8155-2018-4.50022-7.

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Xu, K., Z. Tan i S. Hu. "Study on specific grinding energy of fine ELID cross grinding". W Frontiers of Energy and Environmental Engineering, 559–61. CRC Press, 2012. http://dx.doi.org/10.1201/b13718-130.

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"Experimental Evaluation of the Lubrication Properties of the Wheel/Workpiece Interface in MQL Grinding Using Vegetable Oils". W Enhanced Heat Transfer Mechanism of Nanofluid MQL Cooling Grinding, 249–74. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1546-4.ch011.

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Given the increasing attention to environmental and health problems caused by machining, the development of an environmentally friendly grinding fluid has become an urgent task. In this study, seven typical vegetable oils (i.e., soybean, peanut, maize, rapeseed, palm, castor, and sunflower oil) were used as the minimum quantity lubrication (MQL) base oil to conduct an experimental evaluation of the friction properties of the grinding wheel/workpiece interface. With nickel-based alloy GH4169 as workpiece material, the flood grinding and MQL grinding were selected. Experimental results indicated that castor oil MQL grinding had a friction coefficient and specific grinding energy of 0.30 and 73.47 J/mm3, which decreased by 50.1% and 49.4%, respectively, compared with flood grinding. Moreover, maize oil had the highest G-ratio of 29.15. Peanut, sunflower, and soybean oil with more saturated fatty acids, castor oil with more castor acids, and palm oil with numerous palmitic acids were suitable as lubricating fluids.

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Li, Changhe, i Hafiz Muhammad Ali. "Experimental Research on Minimum Quantity Lubrication Surface Grinding With Different Cooling and Lubrication Conditions". W Research Anthology on Synthesis, Characterization, and Applications of Nanomaterials, 1052–79. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-8591-7.ch043.

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Given the increasing attention to environmental and health problems caused by machining, the development of an environmentally friendly grinding fluid has become an urgent task. The cooling and lubricating properties of different cooling and lubricating conditions were analyzed. The influence mechanism of nanofluids minimum quantity lubrication (NMQL) on cooling and lubricating effect was revealed with different nanoparticles (MoS2, CNT, ZrO2) and different volume concentrations of MoS2 nanofluids (1%, 2%, 3%). The experimental results showed that the temperature rise (258 °C) and grinding force (Fn=70 N, Ft=27 N) obtained under NMQL grinding were the closest to the flood grinding. The specific grinding energy of MoS2 nanofluids was the lowest, which was 47 J/mm3. When the volume concentration was 2%, the best cooling and lubricating effect was obtained. The surface roughness of the workpiece was the lowest (Ra = 0.283 μm; Rz = 0.424 μm).

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"Experimental Research on Minimum Quantity Lubrication Surface Grinding With Different Cooling and Lubrication Conditions". W Enhanced Heat Transfer Mechanism of Nanofluid MQL Cooling Grinding, 132–59. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1546-4.ch006.

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Given the increasing attention to environmental and health problems caused by machining, the development of an environmentally friendly grinding fluid has become an urgent task. The cooling and lubricating properties of different cooling and lubricating conditions were analyzed. The influence mechanism of nanofluids minimum quantity lubrication (NMQL) on cooling and lubricating effect was revealed with different nanoparticles (MoS2, CNT, ZrO2) and different volume concentrations of MoS2 nanofluids (1%, 2%, 3%). The experimental results showed that the temperature rise (258 °C) and grinding force (Fn=70 N, Ft=27 N) obtained under NMQL grinding were the closest to the flood grinding. The specific grinding energy of MoS2 nanofluids was the lowest, which was 47 J/mm3. When the volume concentration was 2%, the best cooling and lubricating effect was obtained. The surface roughness of the workpiece was the lowest (Ra = 0.283 μm; Rz = 0.424 μm).

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Solona, Olena, i Ihor Kupchuk. "DEVELOPMENT OF A FUNCTIONAL MODEL OF A VIBRATING MILL WITH ADAPTIVE CONTROL SYSTEM OF MODE PARAMETERS". W Modernization of research area: national prospects and European practices. Publishing House “Baltija Publishing”, 2022. http://dx.doi.org/10.30525/978-9934-26-221-0-12.

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The research was supported and funded by the Ministry of Education and Science of Ukraine under grant No. 0121U108589 «Development of a complex of energy-efficient and resource-saving equipment and promising technologies for feeding farm animals of the AIC of Ukraine». The introduction of energy-efficient machines and technologies in the system of feed preparation and animal feeding is an important prerequisite for the development of agriculture. One of the advanced types of grinding technology are vibrating mills, which provide high specific productivity at relatively low energy consumption, adjustable tone of grinding products. Vibration impact on the product significantly increases the shock-absorbing effect with the possibility of wide and separate variation of shock and abrasion factors. Significant speed of mechanical and heat and mass transfer processes, a high degree of homogeneity of the product, the ability to effectively implement fine grinding and dispersion of the product at relatively low energy consumption lead to the widespread use of vibratory grinding.The constructive scheme of the mill is developed, in which the flat vertical vibrating field provides lifting of a part of loading and by means of the transport-reloading device carries out its continuously regulated movement from one grinding chamber to another, thereby circulating-spatial movement of the environment in which grinding shock interaction of grinding bodies and material that is crushed. One of the most important rules for the construction of vibrating mills is the need to maximize the degree of their automation in order to increase productivity, improve the quality of grinding and reduce the cost of the technological process.A constructive model of a controlled vibration mill with spatial-circulating motion was also developed, which constantly changes to the resonant mode of operation at the set technologically optimal parameters (productivity) and minimum energy consumption for vibration when changing the mass of the working body in the process of separation and unloading of crushed material from the grinding chamber.The aim of the study is to establish the dependence of the parameters of the crushed mass along the grinding chambers and in places of overload on the parameters of vibration of the vibration mill of continuous motion.Development of a structural model of adaptive vibration mill with spatial-circulating loading movement which when changing the mass of the working body in the process of separation and unloading of crushed material from the grinding chamber could constantly adapt to resonant mode at given technologically optimal parameters (productivity) and minimum energy consumptionResearch methods. Theoretical and experimental research methods were used in the work. Experiment planning and regression analysis methods were used in conducting experiments and processing experimental data. Verification of the adequacy of the obtained dependences with experimental data was carried out by methods of mathematical statistics.Scientific novelty: the theory and practice of vibration mechanics were further developed, in particular, the conditions of vertical lifting of the loading part in vibrating mills with a U-shaped chamber were determined and the influence of the main factors on the lifting height was studied; for the first time the scheme of the vibrating mill with spatial-circulating loading movement is developed, in which the effect of lifting of loading is used and by means of the transport-technological device reloading in the interconnected chambers is carried out.Practical significance. The conditions and parameters of the vibration field that regulate the intensity and duration of grinding are determined. The dependence of the productivity Q of a vibrating mill on the velocity of transporting the loaded mass along the grinding chamber has been established. The structure and two-circuit principle of control of work of adaptive vibration mill with spatial-circulating movement of loading are offered.

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Carmichael Milton, Jemimah, i Prince Arulraj Gnanaraj. "Compressive Strength of Concrete with Nano Cement". W Cement Industry - Optimization, Characterization and Sustainable Application. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.93881.

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Nano technology plays a very vital role in all the areas of research. The incorporation of nano materials in concrete offers many advantages and improves the workability, the strength and durability properties of concrete. In this study an attempt has been made to carry out an experimental investigation on concrete in which cement was replaced with nano sized cement. Ordinary Portland cement of 53 grade was ground in a ball grinding mill to produce nano cement. The characterization of nano cement was studied using Scanning Electron Microscope (SEM), Brunauer Emmett–Teller (BET), Energy Dispersive X ray microanalysis (EDAX) and Fourier Transform Infrared Spectroscopy (FTIR). From the characterization studies, it was confirmed that particles were converted to nano size, the specific surface area increased and the chemical composition remained almost the same. The properties of cement paste with and without nano cement were found. For the experimental study, cement was replaced with 10%, 20%, 30%, 40% and 50% of nano cement. Cement mortar of ratio 1:3 and concrete of grades M20, M30, M40 and M50 were used. Compressive strength of cement mortar and concrete with different percentages of nano cement was found. The cement mortar was also subjected to micro structural study. It was found that the strength increased even up to the replacement level of 50%. Further increase in the replacement is not possible since the addition of nano cement reduces the initial and final setting time of cement paste. At 50% replacement level, the initial setting time got reduced to 30 minutes which the least permitted value as per IS 12269: 2013. The increase in strength was due to the fact that nano cement acts not only as a filler material but also the reactivity increased due to the higher specific surface area. The SEM image shows the formation of additional C-S-H gel. The percentage increase in compressive strength was found to increase up to 32%. The workability of concrete with nano cement was found to be significantly more than that of the normal cement concrete.

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Obodovych, Oleksandr, i Olesya Stepanova. "NUMERICAL SIMULATION OF THE PROCESSES OF HYDRODTNAMICS AND HEAT TRANSFER PROCESSES IN ROTOR-PULSATION APPARATUS". W Traditional and innovative approaches to scientific research: theory, methodology, practice. Publishing House “Baltija Publishing”, 2022. http://dx.doi.org/10.30525/978-9934-26-241-8-5.

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The development of energy-saving technologies that meet the modern requirements of product production is based on the development of new concepts, conducting comprehensive scientific research, and a detailed study of the essence of physical phenomena, which determines the possibility of purposeful management of the technological process and ensuring optimal conditions for its implementation. In the existing devices for the preparation of mixtures, grinding methods are used in hammer crushers and mills, which requires significant expenditure of mechanical (electrical) energy. Therefore, it is necessary to develop devices with a high degree of influence on the processed environment, which increases productivity and reduces energy consumption in technological processes. Such devices include rotary-pulsation devices, the principle of operation of which is based on the method of discrete-pulse energy input. The basis of this method is the multifactorial influence on the processed liquid homogeneous or heterogeneous environment, consisting of pressure pulsations, changes in the liquid flow rate, intense cavitation, developed turbulence, rigid cumulative impact, as well as high shear forces. The current task in this work is the study of the impact of discrete-pulse energy input mechanisms that take place in rotary-pulsation devices during the processing of heterogeneous media, as well as the development of new designs of devices of the specified type to obtain high-quality products. Therefore, the work is devoted to the development of a new design of the rotor-pulsation apparatus for the preparation of liquid mixtures, the principle of which is the use of a working chamber with a rotor and a stator, which have holes of different configurations. The purpose of the study is to conduct a comprehensive analysis of kinematic and dynamic characteristics and establish the features of discrete-pulse energy input during the dispersion of mixtures in a rotary-pulsation apparatus and to develop, on this basis, energy-saving technology and equipment for their preparation. Numerical modeling and experimental research of the processes of hydrodynamics and heat transfer in the mixture during its preparation were carried out. The working chamber of the device consists of a cylindrical rotor and stator containing round and rectangular perforated holes. The mathematical model includes the two- or three-dimensional Navier-Stokes equations, the κ-ε transport equation of the turbulence model, and the energy equation. Factors that affect the processes of deformation and destruction of dispersed particles in heterogeneous media processed in rotary-pulsation devices are pressure pulsations, as well as normal and tangential stress pulsations that occur in the flow when it passes through the working zone of the device. As a result of numerical studies, the fields of velocities, pressures and temperatures of the studied media were found, and the most optimal geometric characteristics of the working chamber of the rotary-pulsation apparatus were determined. Based on the obtained results of numerical simulation, the designs of the rotor-pulsation apparatus will be selected, which will be used for the production of industrial research samples of this device.

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Streszczenia konferencji na temat "Specific grinding energy"

Mayer, John E., Angie H. Price, Ganesh K. Purushothaman i Sanjay V. Gopalakrishnan. "Specific Grinding Energy Causing Thermal Damage in Precision Gear Steels". W ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0703.

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Abstract Thermal damage (burn) in carburized and hardened precision gear steels caused by grinding was investigated. Excessive grinding temperatures cause grinding bum and result in excessive scrappage. AISI 9310 and X53 gear steels, used in helicopters and tilt-rotor aircraft, respectively, were prepared and heat-treated by a production partner. Grinding tests were conducted on these steels. Nital etching was used to detect grinding burn. Models were established to predict onset of thermal damage for AISI 9310 and X53 steels based on specific grinding energy determined from grinding force measurements. The models were compared to results published for other steels.

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Badger, Jeffrey. "Cylindrical Grinding of Nitrided Steels: Grindability, Specific Energy, Temperatures, Residual Stresses and Fatigue Failure". W ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/msec2014-4001.

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An investigation was made into plunge and traverse cylindrical grinding of nitrided steels in an industrial case involving premature fatigue failure due to residual stresses. The effect of nitriding on grindability was analyzed via specific-energy measurements. Residual stresses were analyzed, including: (1) compressive, from nitriding, with discussion on how this alters stress measurements in practice; (2) compressive, from plastic deformation from grinding; and (3) tensile, from thermal effects in grinding, including the alteration of the nitriding compressive effect. A thermal model was developed to predict surface temperatures in grinding — which were correlated to residual tensile stress measurements — allowing the reduction of stresses and the elimination of fatigue failure.

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Belmajdoub, Fahd, i Souad Abderafi. "Specific Electricity Consumption optimization of Raw Grinding Workshop in a Moroccan Cement Plant". W 2018 6th International Renewable and Sustainable Energy Conference (IRSEC). IEEE, 2018. http://dx.doi.org/10.1109/irsec.2018.8702965.

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Tawakoli, Taghi, i Bahman Azarhoushang. "Effects of Ultrasonic Assisted Grinding on CBN Grinding Wheels Performance". W ASME 2009 International Manufacturing Science and Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/msec2009-84186.

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The effects of ultrasonic assisted grinding on vitrified CBN grinding wheels performance have been investigated. The ultrasonic vibration has been superimposed to the workpiece in feed and cross feed directions and the kinematics of the process in both directions have been discussed. The obtained results show that applying ultrasonic vibration to the grinding process can improve the quality of the workpiece surface, the efficiency of the process and decrease the grinding forces and specific energy considerably.

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Batako, Andre D. L., Valery V. Kuzin i Brian Rowe. "New Development in High Efficiency Deep Grinding". W ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82530.

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High Efficiency Deep Grinding (HEDG) has been known to secure high removal rates in grinding processes at high wheel speed, relatively large depth of cut and moderately high work speed. High removal rates in HEDG are associated with very efficient grinding and secure very low specific energy comparable to conventional cutting processes. Though there exist HEDG-enabled machine tools, the wide spread of HEDG has been very limited due to the requirement for the machine tool and process design to ensure workpiece surface integrity. HEDG is an aggressive machining process that requires an adequate selection of grinding parameters in order to be successful within a given machine tool and workpiece configuration. This paper presents progress made in the development of a specialised HEDG machine. Results of HEDG processes obtained from the designed machine tool are presented to illustrate achievable high specific removal rates. Specific grinding energies are shown alongside with measured contact arc temperatures. An enhanced single-pole thermocouple technique was used to measure the actual contact temperatures in deep cutting. The performance of conventional wheels is depicted together with the performance of a CBN wheel obtained from actual industrial tests.

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Tawakoli, Taghi, i Bahman Azarhoushang. "Development of a Novel Method for Dry Grinding of Soft Steel". W ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66038.

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Compared to other machining processes, grinding involves high specific energy. This energy mainly transforms to heat which makes detrimental effects on surface integrity as well as tool wear. In dry grinding, as there is no cutting fluid to transmit generated heat in the contact zone, reducing grinding energy and grinding forces are crucial. Presented in this paper are some of the promising results of the systematic research work carried out by the authors in order to come closer to the goal of pure dry grinding. A new method to reduce the heat by superimposing ultrasonic vibrations on workpiece movement is presented. The obtained results show that the application of ultrasonic vibration can eliminate the thermal damage on the workpiece and decrease the grinding forces considerably. A decrease of up to 60% of normal grinding forces and up to 40% of tangential grinding forces has been achieved.

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Drazumeric, Radovan, Jeffrey Badger, Janez Kopac i Peter Krajnik. "Thermal Aspects and Grinding Aggressiveness in View of Optimizing High-Performance Grinding Operations in the Automotive Industry". W ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/msec2014-3993.

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This paper first reviews early contributions to modeling and analysis of thermal aspects in grinding. The role of specific energy in the determination of grinding temperatures is then discussed with respect to both chip thickness and grinding aggressiveness. The underlying modeling of cylindrical grinding is given in general terms, enabling calculation of the instantaneous geometry, kinematics and temperature for any workpiece form. The focus is on the recently developed concept of constant-temperature grinding, which entails choosing process parameters based on a thermal model for achieving a constant temperature and then optimizing the grinding process for either shorter cycle times or higher quality while applying constant temperature. Machine limitations — in terms of maximum speed, acceleration, and jerk in the headstock and wheelhead movement — are considered in the optimization. Case studies and experimental work are presented for high-performance industrial cam-lobe grinding used in the automotive industry.

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Campbell, James D. "A Comparison of Fluids Used to Superabrasively Machine a Titanium Alloy". W ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/91-gt-321.

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The objective of this paper was to compare the creep feed superabrasive machining of an alpha-beta structural titanium alloy, using a water-soluble and a straight oil grinding fluid, in terms of residual stress, specific energy, power flux and microstructure. The statistical effect of process variables on these criteria was investigated using a Taguchi screening design of experiment. Grinding wheel peripheral velocity, abrasive size and fluid type were the most important factors contributing to compressive residual stress. After the depth of cut, fluid type contributed the most variation to specific energy and power flux. Both fluids produced testpieces that were microstructurally sound, and were essentially stress free or had favorable compressive residual stress.

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Liu, Yao, Beizhi Li i Yihao Zheng. "Investigation of High-Speed Nanogrinding Mechanism Based on Molecular Dynamics". W ASME 2018 13th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/msec2018-6416.

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The SiC ceramic ductile grinding, which can obtain crack-free ground surface, is a challenge in brittle material machining. To understand the brittle material ductile grinding mechanism in the nanoscale, a molecular dynamics (MD) model is built to study the single diamond grit grinding silicon carbide ceramic. Through analyzing the MD simulation process, the grit forces the SiC to deform and form the chip through the plastic deformation and flow. The ground surface has no crack on the surface and damage layer thickness is less than one atom layer under the nanoscale depth of cut, which indicates the nanogrinding can achieve the pure ductile grinding for the SiC ceramic and obtain a crack-free and high-quality ground surface. Grinding force, stress, temperature, and specific energy increase with the wheel speed and depth of cut due to the higher grinding speed and a smaller depth of cut can generate a higher density of defects (vacancies, interstitial atoms, and dislocations) on the workpiece, which can make the silicon carbide ceramic more ductile. The high wheel speed is favorable for the ductile grinding.

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Li, Ping, Tan Jin, Zongfu Guo, Jun Yi i Meina Qu. "Analysis on the Effects of Grinding Wheel Speed on Removal Behavior of Brittle Optical Materials". W ASME 2016 11th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/msec2016-8765.

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It is often desired to increase the machining rate while maintaining the desired surface and subsurface integrity during fabricating high-quality optical glass components. This paper proposed a high-speed high-efficiency low-damage grinding technology for machining brittle optical materials, which consists of three grinding processes: rough grinding, semi-finishing grinding and finishing grinding. Grinding characteristics is investigated with respect to grinding forces, specific cutting energy, surface roughness, ground surface quality, subsurface damage, and material removal mechanisms in grinding of fused silica optical glasses with this technology at the grinding speeds of up to 150 m/s. These indications are thoroughly discussed by contacting the undeformed chip thickness. The results indicate that the level of these indications are significantly improved with an increase in the wheel speed due to the decrease of the undeformed chip thickness. It is also found that the improvement of ground surface quality is limited when the wheel speed from 120 m/s increases to 150 m/s may be due to the influence of vibration caused by the higher wheel speed. For different grinding processes, these results are also substantially improved with the change of grinding conditions. It is found that the material removal mechanism is dominated by brittle fracture at rough and semi-finishing grinding processes, while ductile flow mode can be observed at the finishing grinding process. There are some differences between the experimental results and the previous predicted model of subsurface damage depth.

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