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  • 1
    Electronic Resource
    Electronic Resource
    Detection of Grinding Surface’s Quality Based on Image Technique (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 359-360 (Nov. 2007), p. 499-503 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Aiming at different grinding surfaces of hardened bearing steel GCr15, this paper madeexperimental research on detection method of surface roughness based on image technique.Adopting cold light source and five kinds of LED light sources, such as low-angle light, collimatedlight and coaxial light, we analyzed image characteristics of grinding surface under differentprocessing conditions and found that there was a good correlation between standard deviation ofgray variance and roughness of grinding surface. In comparison with the results from traditionalsurface roughness measuring instrument, we gained the corresponding relation between differentgrinding surface roughness and standard deviation of image gray variance. It was proved bycalculating that they have a good correlativity
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.359-360.499.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Experimental Investigation on Air Cooling of GCr15 (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 375-376 (Mar. 2008), p. 197-200 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Air cooling is a near dry machining method, which cools cutting area and evacuates chipsusing low temperature cold wind instead of cutting liquid. It can decrease tool wear, increase toollife, reduce machining cost and bring no chemical pollution. In this paper, air cooling test wascarried on, in which vortex tube was used for cooling and high hardness bear steel GCr15 wasmachined by PCBN tool. Experiment results indicated that cold air from vortex tube has asignificant effect on cutting force, cutting temperature and chip formation process. This paper’sconclusions will have a great reference value for the practical application of air cooling technology
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.375-376.197.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Chamfered PCBN Tool Edge Geometries on Hard Turning Process (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 375-376 (Mar. 2008), p. 187-191 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: By cutting experiments, this paper investigates the effect of various chamfer widths andchamfer angles on cutting force, cutting temperature, and chip morphology when hardened steelGCr15(HRC60+2) is machined with PCBN tools. The research results indicate that with theenlargement of chamfer angle both cutting temperature and main cutting force increase gradually, andespecially, radial force increases more significantly. In addition, it is shown that as chamfer widthincreases both cutting force and cutting temperature rise. The analytical results of chips derived fromcutting experiments reveal that chamfer angle being 20º, chips are the thickest and less serrated.Furthermore, chip thickness diminishes gradually with the increment of chamfer width
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.375-376.187.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Technology Improvement and Parameter Optimization on the Electroplating Superhard Grinding Material (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 359-360 (Nov. 2007), p. 559-563 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The superhard abrasive tools are usually made by the electroplating abrasive method. Theelectroplating quality has the directly effect on the life and the performance of the superhardabrasive tools. The electroplating technology is the major factor which influences the electroplatingqualityy. The plating pretreatment and plating nickel processes in the basic electroplatingtechnology were improved in this paper. The deburring, the oil removing by electrochemistry, theanode dispose procedures and a set of new electroplating technology about incoming slot withelectronics and impact current in the plating nickel process were brought forward in this paper andthe experiment research was taken as well. The result of the experiment which used the newtechnology showed that the binding power on the plating tier was enhanced, the electroplatingquality was advanced; secondly, the effects of the parameters such as the directions for theelectroplating solution, the current density, the temperature of the electroplating solution and PHvalues on the electroplating quality were studied in the experiment. Finally the optimization resultwas gained
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.359-360.559.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Experimental Research on Orthogonal Cutting and Oblique Cutting of Hardened Steel GCr15 (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 375-376 (Mar. 2008), p. 192-196 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Experiment of hard cutting GCr15 with PCBN cutting tools, the influence of tool’sinclination angle and cutting parameters (cutting speed and feed speed) on cutting forces and cuttingtemperature are studied. A three-dimensional finite elements model using the commercial softwareDeform 3D 5.03 is developed. The friction between the tool and the chip is assumed to follow amodified Coulomb friction law and the adaptive remeshing technique is using for the formation ofchip. The workpiece material property is a function of temperature, strain, and strain rate in theprimary and secondary shear zones. Finite element method is used to simulate three-dimensionalprecision cutting, including orthogonal cutting and oblique cutting. The cutting forces and backforces are slightly changed by tool’s inclination angle. However, in high cutting speed, the cuttingforce decrease as the tool’s inclination angle increase, while the cutting temperature increase as thetool’s inclination angle increase. The simulation results are compared with experimentally measureddata and found to be in good agreement to some extent
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.375-376.192.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of Cutting Parameters on Integrality of Machined Surface in Hard Cutting (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 471-472 (Dec. 2004), p. 307-311 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: There is a bright future for hard cutting technique because of good machining flexibility, high efficiency, no pollution. This paper presents effect rules of cutting parameters (cutting speed, feed, depth of cutting) on integrality of machined surface (surface roughness, surface hardness, surface hardened depth, residual stresses, surface texture) based on orthogonalization test. Optimal cutting parameters are selected according to these rules. Surface roughness (Ra) is up to 0.6µm in terms of selected optimal cutting parameters
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.471-472.307.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    The Key Technology Research for Vision Inspecting Instrument of Steel Ball Surface Defect (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 392-394 (Oct. 2008), p. 816-820 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: It has been necessary to adopting automatic detection of steel ball based on machine visionin industrial processing. The detecting instrument for surface quality of steel ball based on machinevision and embedded control technique and is applied to detecting external bug region of steel ball inbearing. Its image detection and control system require excellent real-time character and high controlaccuracy. This paper put forward a new design for image processing and control system of detectinginstrument. Firstly, we adopted OTSU segmentation arithmetic based on image enhancement andmedian filtering. As a result, steel ball was detected by area character parameter. Secondly, weadopted TMS320LF2407A as main processor and integrated CPLD to develop an embeddedcontroller. It presents a novel optimal design method for PID controller based on the ant colonyoptimization (ACO) algorithm to optimize traditional PID control algorithm. At last, a performancestudy of experimental system is conducted and it shows that the proposed method can be used inonline steel ball detection applications
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.392-394.816.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Research of Detector for Surface Defects of Steel Ball Based on Improved PID Control (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 392-394 (Oct. 2008), p. 941-945 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper used digital image technology to detect surface defects of steel ball, anddesigned mechanism body and the corresponding control system. In order to improve the poorcontrol effect of basic PID, we put forward modified PID control strategy, combiningspeed-variable integral, differential, and anti-saturation integral, then realized optimum design forPID parameters. The experimental results indicated that PID control strategy in the paper based onoptimizing parameters had a maximum output at the initial time interval, so that the response speedof system would be much higher, and the adjusting time would also be shorter
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.392-394.941.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of Air Cooling on the Process of High Speed Hard Cutting GCr15 (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 369-372 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Air cooling is a near dry machining method, which cools cutting area and evacuates chipusing low temperature wind instead of cutting liquid. It can decrease tool wear, improve tool life,reduce cost and produce no chemical pollution. In this paper, air cooling system is established, inwhich vortex tube is used for cooling. Air cooling test was carried on, in which high hardness bearsteel GCr15 is machined by PCBN tool. Experiment results indicated that cold air from vortex tubehas a significant effect on cutting force, cutting temperature and chip formation process. Cuttingforce and cutting temperature were simulated using Marc. Change rules that analysis resultsindicated are in accordance with experiment results. This paper’s conclusions have a great referencevalue for the practical application of air cooling technology
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.369.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of Different Edge Preparation on High Speed Turning Hardened Steel Process (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 412-415 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Through combining turning experiments and FE simulations, this paper studied theeffects of force, temperature and residual stress of machined surface on high speed hard turningGCr15 bearing steel hardened to HRC60-62 with three kinds of ordinary edge preparation(sharp-edge, hone and chamfer). The experiment and simulation results indicated that thediathermanous proportion of chamfered edge preparation to tool and machined surface is less, andthis distribution of cutting temperatures is useful for tool life and machined surface quality. Thesimulation results showed that cutting force had a descending tendency with increasing of cuttingspeed, which is in accordance with the change rules of machining general rigidity material, and itproved that FE simulations have good precision. The simulation results of residual stress ofmachined surface showed that residual tensile stress existed in machined surface using both honedand chamfered tools, and a highest compressive stress (about -200MPa) existed among 150-200μmof the depth into the workpiece surface. The difference was that the depth of superficial hardenlayer with honed tools is larger than that with chamfered tools
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.412.pdf
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