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  • 2005-2009  (53)
  • 2006  (53)
  • 1
    Electronic Resource
    Electronic Resource
    Study on Block Electrode Discharge Grinding of Micro Rods (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 304-305 (Feb. 2006), p. 201-205 
    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: Block electrode discharge grinding is an effective approach to produce micro rods.However, it is difficult to fabricate the rods into desired miniature and precision. To solve this problem, the tangential feeding method is proposed to control the finish size of micro rods. With this method, the micro rod is first fed in its radial direction, and then in the tangential direction for an enough distance. The wear of the block electrode decreases gradually from the start to the end, and the wear in the end can be neglected. Experiments indicate that the large capacitance or voltage canobtain high machining speed, while the small ones can gain thin micro rods. Based on this result, the policy of delaminating grinding is adopted to gain enough thin micro rods at a high machining speed. The Φ5µm micro rods can be ground with this method. SEM results show that the relative error of the size control is less than 10%
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.304-305.201.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Damage of Concrete Dams and Its Simulation Calculation (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 302-303 (Jan. 2006), p. 624-629 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.302-303.624.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    The Perfect Elastic-Viscoplastic Field at Mode I Quasi-Static Propagating Crack-Tip in Rate-Sensitive Material (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 17-20 
    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: Under the assumption that the artificial viscosity coefficient at the propagating crack tipis in inverse proportion to power law of the plastic strain rate, a rate-sensitive constitutiverelationship is derived for perfect elastic-plastic material. With the adoption of the rate-sensitiveconstitutive relationship, it is asymptotically investigated the propagating tip fields of plane strainmode I. And the quasi-static equations are obtained separately governing the stress and strain fieldsat the crack-tip by means of Airy stress function. Numerical calculations of governing equations arecarried out by double parameters shooting, with selections of appropriate values of eachcharacteristic parameter by combinations of boundary, and the fully continuous stress-strain fieldsare obtained at the crack-tip. The analytical and computational results indicate that viscosity effectis an important factor in crack-tip fields
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.17.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental Study of Micro Holes Machining by USM (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 21-24 
    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: It is necessary to drill micro holes in some hard brittle materials. Comparing with electrodischarge machining, electrochemical machining and laser machining, the ultrasonic machining(USM) has unique advantages in hard brittle materials machining. The aim of this paper is topresent experimental work that has been done in micro holes machining by micro USM. The mainmachining mechanisms of USM are discussed. It is pointed out that the contributions of eachmechanism to material removal rate are different in different cases. By using micro USM withworkpiece vibration and tool feeding in constant rate, the experiments of micro holes machining arecarried out and the process laws of tool wear are studied. Some phenomena are found and thecausation of causing these phenomena is analyzed. A Ø13μm micro hole is obtained
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.21.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Expert System of the Parameter Optimization in the Heavy-Duty Cutting Processing (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 1140-1143 
    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: This paper is focused on using the method of computer technology combined with theknowledge of experts to determine heavy-duty cutting processing parameters according to therelevant theories of metal cutting. This “Expert System of the Parameter Optimization in theHeavy-duty Cutting Processing” is based on the VC++6.0 programming language and SQL Sever2000. It is divided into two subsystems, turning and milling machining. Taking the turning machiningsubsystem for example, by using methods of generating expression combined with framerepresentation, this paper classifies and generalizes related knowledge, and combines the knowledgebase with the data base to set up the knowledge base of the subsystem. Also this paper introduces theprocess of inferential mechanism of the optimizing modules of cutters and machining engagements
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.1140.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Experimental Research on Machining Performance of Electrode Materials in Dry EDM (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 173-176 
    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: Electrode materials are important factors affecting machining performances (MP) ofelectrical discharge machining (EDM). Experiments using different electrode materials were carriedout in compressed air aim to realize MP of electrical discharge machining in gas (dry EDM).Experimental results show that a minimum pulse interval exists for given parameters and toolmaterial. Calorific performances of tool materials are main influencing factors of MP on thecondition of thorough deionization. Copper achieves the best MP in the experimental tool materials.Experimental results of different workpiece materials depict that material remove rate (MRR) andsurface roughness (SR) value increase with increases of discharge energy. SKD61 steel achieves thehighest MRR and SR value in the experimental materials. Material holding better performance ofheat resistant, such as titanium alloy (TC4), achieves the lowest MRR
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.173.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Experimental Investigation on Friction Performance of Mechanical Seals with a Laser-Textured Seal Face (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 81-84 
    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: Regular micro-surface structure in the form of micro-pores produced on the face ofmechanical seals by laser technology can be used to improve the friction performance of the sealmating rings. A test rig with variable axial load was used to test laser-textured seal rings withmicro-pores of various pore depth and pore ratio to study the effect of the laser-textured seal facestructure parameters on the friction performance of mechanical seals. It is found that there areoptimum texturing face parameters at which the friction torque and the face temperature rise of sealrings are minimum. Results of these tests show that the micro-pores on one of the seal mating facescan generate substantial hydrodynamic effect.Heat generation due to frictional contact on seal-ring surfaces is a major factor that causesdeterioration of face seals and shortens their service life[1,2]. Excessive temperature rise can beavoided by improving structure of a seal surface. By means of laser technology return-flow structure,oblique line groove and spherical micro-pores are engraved on the seal face[3-5]. The researchshows that substantial hydrodynamic effect can be generated between the seal faces withmicro-pores[6-8]. In this study experiments are performed on laser-textured micro-pores seal facesat various axial loads to investigate the effect of the face structure and operating parameters onfriction torque and face temperature rise
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.81.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Fabrication of Microelectrode by Current Density Control in Electrochemical Micromachining (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 221-224 
    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: The fabrication technology of microelectrode in electrochemical micromachining (EMM)was presented. The high frequency short pulses current and current density control between thecathode and anode were synthetically utilized. The mechanism of pulses EMM was expatiated firstly.The shaping principle of microelectrode was analyzed. The current density control strategy wasproposed based on the fundamental experimental behavior of electrochemical machining current withthe gap variance. Then an experimental setup for EMM is constructed, which has machining processdetection and current density control functions, also a pulses power supply and a control computer areinvolved in. After the technologic experiment analyzed, some microelectrodes with nice surface arefabricated successfully. This method could provide the simple electrode for further electro-machiningor micro probe for scanning probe microscopy. Preliminary experimental results show the feasibilityof EMM and its potential capability for better machining accuracy and smaller machining size
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.221.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Study on Technology of Micro-EDM with Lower Working Voltage (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 225-228 
    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: This paper presents new machining technology of micro-EDM with lower workingvoltage in RC pulse power source. How to control the discharging energy of one pulse supplied byRC power is crucial to the technology of micro-EDM. The process of discharging has been studied,then the feasibility of machining with lower working voltage has been put forward, in order toreduce the discharge energy of one pulse effectively. On the basis of a great deal of experiments,the effect of working voltage on surface quality is studied, also the effect of working voltage onmachining efficiency has been found out and been analyzed theoretically. The result shows thatlower working voltage can reduce the working energy observably, and then improve the machiningsurface quality attended by reducing of machining efficiency. However, there is a good machiningeffect when the working voltage is about 15~20V. Considering working efficiency, a newtechnology of block electro-discharge grinding (BEDG) with lower working voltage has beenapplied. As shown by the experimental result with the technology, the minimum diameter ofmicro-shaft reaches 32m. Moreover, the micro-shaft has very high surface quality of Ra 0.1252mand its coaxial diameter error is controlled within 0.152m
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.225.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Research on EDC Special Pulse Generator and Its Experiments (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 253-256 
    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: A modified coating layer had been deposited on the surface of the workpiece with theelectrode made of special materials by normal Electrical Discharge Machining (EDM) method inthe recent years, and the surface performance had been improved. But, it also has been found thatthe deposited materials from the electrode can’t be melted fully on the workpiece and the compactcoating can’t be formed because of the quencher and quickly heated effect with normal EDM pulsegenerator in the experiments. And there are other problems existing such as residual stress, crackand so on. In order to solve the above problems, a kind of special Electrical Discharge Coating(EDC) pulse generator is designed in this paper. The hard coating with less crack and higher coatingefficiency can be expected with this special generator
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.253.pdf
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