外文翻譯--磨削過程中應(yīng)力殘留-在線瀏覽
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【正文】 ual stress in surface grinding was proved. 2001 Elsevier Science . Allrights reserved.Keywords: Residual stress。 Wheel/workpiece 1. IntroductionGrinding is one of the most popular methods of machininghard materials. Because it is usually one of the 174。uence directly the functional propertiesof the workpiece such as fatigue strength, abrasive andcorrosion resistance, etc.Creating favourable surface integrity, especially in grindingwith aluminium oxide grinding wheels is dif174。cultdue to the lack of relatively simple and universal routines,among others. Because of the importance of grinding operationthe investigations of this process are performed in manyresearch centres. Some general approaches are observed inthese investigations.The 174。nding a correlationbetween grinding conditions and surface layer parameters.This is a relatively simple method with somedisadvantages. Experimental works are usually time andcapitalconsuming which limits their application. Moreover,there is a limited possibility to extrapolate the experimentalresults on different grinding methods and grindingconditions.There is also a third approach to the problem of control ofsurface layer creation, which involves a search for suchgrinding coef174。cients existing. The most popular are: equivalent chipthickness (heq) and power density (P0). The former is provedto be useful in grinding ceramics, the latter is often appliedwhen grinding with aluminium oxide grinding wheels isinvestigated [2].The main disadvantage of both coef174。cult to estimate ``online39。 grindingaccurately.Thus, an ``easytoestimate39。 grinding coef174。cient bining power density and thewheel/workpiece contact time and residual stress in surfacegrinding is described below.2. Grinding coef174。uences the grinding temperature butthere is also a second important factor 208。cient B is a product of powerdensity P0 and contact time tc:B . P0tc .Pbdlelevw .Pbdvw(2)where P is the total grinding power and bd the grindingwidth.The 174。cient is that all quantitiesin this equation (grinding power, grinding width and workspeed)are easy to measure ``online39。 in a grinding process.3. Experimental setupExperiments were carried out for the following grindingconditions._ workmaterials: carbon steel % C, 28HRC (marked S),alloy steel 40H (%C, %Cr, % Ni) 48HRC (H),bearing steel 232。_ grinding wheels: 38A60J8V (J), 99A80M7V (M)。_ grinding depth: from to mm。_ grinding fluid: emulsion or none.Grinding parameters in these investigations were limitedby the power of the main wheel drive, table speed regulationrange and by the appearance of unacceptable changes in thesurface layer, microcracks
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