The effect of the grinding wheel modification on the state of the workpiece surface layer after internal cylindrical grinding of steel C45.
[ 1 ] Wydział Techniczny, Akademia im. Jakuba z Paradyża | [ P ] pracownik
2017
artykuł naukowy
angielski
- Grinding wheel modifications
- surface layer
- internal cylindrical grinding
- surface roughness
- residual stresses
EN The effect of the grinding wheelmodification on the state of theworkpiece surface layer after internalcylindrical grinding of steel C45Ryszard Wo ́jcik1and Krzysztof Nadolny2AbstractInternal cylindrical grinding is one of the most difficult grinding processes due to the very long zone of contact betweenthe grinding wheel and the workpiece surface. Such conditions limit delivery of the grinding fluid into the grinding zone,as well as impeding the removal of chips from it. As a result, during the internal cylindrical grinding process, difficultthermal conditions occur in the machining zone which finally could lead to grinding defects. One of the most efficient andcost-effective ways of improving the grinding stability and repeatability is modifying the grinding wheel structure. As such,modifications usually do not require interfering with the construction of the grinding machine or its equipment, they areuniversal and, possibly, widely applicable. This article presents a modified grinding wheel with helical grooves shaped onits active surface. Such modification was developed to reduce the thermal load of the workpiece surface and theoccurrence of thermal defects. The effectiveness of the proposed grinding wheel modification was examined experi-mentally in the reciprocal circumferential internal cylindrical grinding process of 45C steel. The goal of the describedtests was to determine the influence of the suggested grinding wheel modification on the condition of the workpiecesurface layer (the surface roughness and residual stresses). The test results obtained indicated that application of themodified grinding wheel has a positive influence on the residual stresses in the workpiece surface layer, resulting in betterdelivery of the grinding fluid into the area of contact between the wheel and the machined material. Moreover,a decrease of theRaparameter value by approximately 7–19%, as compared to the results of the process carriedout with the (unmodified) reference grinding wheel was indicated.
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