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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 359-360 (Nov. 2007), p. 94-97 
    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: Grinding wheel passivation is an inevitable phenomenon during grinding process. It hasimportant guiding significance for the formulation of grinding technique to unveil the passivation ruleand generation mechanism. Taking grinding efficiency as evaluation indicator, the passivation curveof grinding wheel during full passivation period under the constant-force grinding condition isestablished through experiments in this dissertation, which is divided into three stages according topassivation speeds and passivation patters, i.e. early passivation stage, stable passivation stage andsharp passivation stage. Of which, the passivation speed is the slowest but with the highest grindingefficiency in early passivation stage. The change of passivation curve with the time is a process fromconcave to convex, which is totally different from the wearing process of grinding wheel in this stage.With combination of experiment conditions and wearing characteristics of grinding wheel, thepassivation rule and its generation reasons are discussed deeply. Furthermore the exponentialfunction y = abx is adopted to make fitting for passivation curve based on the scatter plot of stablepassivation stage and regression equation is derived through the fitting result of origin thus to testifythe correctness of the inference
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1787-1790 
    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: Based on retrieval for domestic and international literatures about the grinding fluidsspecial for ceramic machining use, this paper put forward a method to enhance the engineering ceramic grinding machining efficiency using the organic grinding fluid added with the long chain alcohol The experiment, performed on the constant force cutter, greatly increased the ceramic grinding efficiency by 2.4 times through the comparative experiment for several normal grinding fluids as well as by adding additives. In addition, this paper conducted the matter structural analysis for the liquid-solid interface using the Raman Spectrum technology and preliminarily discussed the mechanism of this grinding fluid
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1451-1454 
    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 compressing piston and cylinder of refrigerating compressor frequently come into failuresas anti-wearability for metal material is weak. Engineering ceramics is appreciated by designers thanks toits excellent performances. However, it is difficult to machining material because of high hardness. TheFEA modules for displacement and stress distributions of compressing piston and cylinder under declaredrunning conditions are established based on the theories of elasto-plasticity and aerodynamics, whichreveal the optimal precision conjugation clearance dependence of pressure distributions regularitybetween friction couple. Based on the FEA analytical results, the feasibility of replacing metal materialwith Si3N4 ceramics in the friction couple manufacture is researched. Special clamps have been designedto guarantee the superficial quality as mirror surface and tolerances of form and position, technologicalprocedures are programmed, and with satisfactory machining effect
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 404-407 
    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 carries out grinding efficiency experiments on various formulas composed oflong carbon chain alcohol and halogenated hydrocarbons with the first principle of grinding fluid asmain evaluating index and finds via infrared spectrum testing that the conjugating ways oflubricating films between alcohol-type grinding fluid and ceramics is based on chemical adsorptionor hydrogen bonding adsorption and generates alkoxy silane or polyalkoxy silane with perfectanti-friction action under the condition of grinding high temperature. With adding of halogenatedhydrocarbons, it can further make grinding fluid with perfect extreme pressure property andimproves grinding efficiency. Furthermore, this dissertation firstly introduces heat capacity asanalysis means and discusses the influential factors on the removal rate of ceramics materials whenusing abovementioned grinding fluid. It is shown from the result that the material removal ratewhen silicon nitride ceramics grinding will increase with the augmentation of heat capacity
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