Abstract
Different metals can respond differently when grinding using the same abrasive grinding wheel, especially in terms of surface quality. In this context, this work aims give a contribution to the metalworking industry by presenting the results of surface finishing after grinding the following metals: VP Atlas steel grade, Gray Cast Iron and two superalloys, Inconel 718 and Ti-6Al-4V. Tests were performed with the aluminum oxide grinding wheel and with following parameters: cutting speed of 37.6 m/s and workspeed of 10 m/min. Two values of depth of cut (15 μm and 30 μm) were tested. The surface roughness (Ra and Rz parameters) were analyzed and SEM images of the machined surfaces were taken and analyzed in order to identify the cutting mechanisms and provide better results discussion. The results showed that the surface roughness increased with the depth of cut; Ra values kept below 0.48 μm for all metals tested. Regarding the machined surface quality, some cracks were observed on the gray cast iron and Ti-6Al-4V surfaces, thereby indicating their relative lower grindability compared to VP Atlas steel under the investigated conditions. No visual thermal damage was observed in the machined surfaces of the samples.
Highlights
IntroductionGrinding is a common name given to machining processes that use hard and non-metallic (ceramics) abrasive particles as cutting tool (grinding wheel)
Grinding is a common name given to machining processes that use hard and non-metallic abrasive particles as cutting tool
In this session the surface roughness results are presented according to the equivalent chip thickness and the surface images obtained after the grinding of all the materials
Summary
Grinding is a common name given to machining processes that use hard and non-metallic (ceramics) abrasive particles as cutting tool (grinding wheel) It is highlighted among the abrasive machining processes because of its importance for the metalworking industry, since it is capable of ensuring the production of components with narrower dimensional and geometric tolerances (IT6-IT4) than those obtained in operations which use cutting tools with defined geometry, such as turning and milling. The small depth of cut value and workspeed (vw)/cutting speed (vs) ratio are, in general, responsible for the maintenance of the low surface roughness values These variables define another variable that is typically employed to measure the grinding severity and with the grinding efficiency, that is called equivalent chip thickness (heq), which can be obtained using the Eq (1), and physically corresponds to the volumetric removal rate per unit area of wheel surface passing through the grinding zone [1]: heeee
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