DOI: 10.18503/1995-2732-2024-22-1-76-87
Abstract
The process of creep-feed grinding (CFG) of titanium-based alloys is complicated by their high adhesive activity to the abrasive material. Measures that contribute to improving the grinding process under these conditions are the selection of cutting modes and the grinding wheel characteristics. Further development of machining of hard-to-cut titanium alloys by CFG is facilitated by using one of the latest means of monitoring the condition of a machined surface, namely a scanning electron microscope. The research objective is to study the influence of longitudinal feed speed and hardness of an abrasive tool made of green silicon carbide on the condition of the machined surface of the Ti6Al4V alloy. The condition of the machined surface (morphology, a chemical composition) was monitored using a Versa 3D DualBeam electron microscope. Metal deposits, scratches and grooves left by peaks of the grinding wheel grains were detected on the machined surface. The authors established patterns of forming the machined surface along the length of the workpiece, taking into account a stage of CFG. The stage of constant length of the contact arc is characterized by a high intensity of the adhesive-cohesive interaction between the abrasive material and the titanium alloy, which decreases with the transition to the stage of removing the tool and a decrease in instantaneous cutting ability. When longitudinal feed speed vs increases from 100 mm/min to 150 mm/min, the rate of adhesion of the machined material to peaks of the grinding wheel grains and the transfer of this material back to the workpiece decreases. It has been found that changes in the characteristics of the grinding wheel have a significant effect on the state of the Ti6Al4V surface at vs = 150 mm/min only. Using the method of the spot elemental analysis, we proved the fact of transfer of the abrasive material (silicon carbide crystals) to the titanium alloy at CFG.
Keywords
creep-feed grinding, longitudinal feed speed, titanium alloy, silicon carbide, morphology, scanning electron microscopy
For citation
Nosenko V.A., Kremenetskii L.L., Koryazhkin A.A. The Influence of Creep-Feed Grinding Conditions on the Morphology of the Machined Surface of a Titanium Alloy. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2024, vol. 22, no. 1, pp. 76-87. https://doi.org/10.18503/1995-2732-2024-22-1-76-87
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