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Usinage des aciers prétraités à l'huile entière - effets physico-chimiques des additifs soufrés

Abstract : Most machining operations require the presence of a cutting fluid in order to ensure its success due to the intensity of thermal and mechanical conditions. The objective of this study is to identify and compare the performance of various sulphur additives, select between them the most efficient one, and understand their action mechanisms in the different applications of machining. Thus, this study aims at analyzing the tribochemical mechanisms of lubrication during machining operations and subsequently at optimizing the formulation of the lubricant. The influence of different cutting parameters is also investigated with intention to bring more knowledge about the general action of lubricants in case of modern machining. Firstly, machining tests are performed to measure the effect of the different additives. The goal is to establish the effectiveness of cutting oils according to machining parameters - such as the specific cutting force. The study is completed with the performance evaluation of cutting oils in terms of tool life (or wear). The comparison of additives performances in form tapping is also accomplished by the means of average tapping torque. Secondly, a physicochemical analysis (AES, XPS) is carried out with the purpose of detecting the nature of the additives reaction products with the surface (chips, tools, workpieces). A correlation between the results of additives performance evaluation by the mechanical tests and their surface reaction products is highlighted. Some complementary analyses, such as analysis of thermal behavior of additives (TGAIIR, DSC), observation of thin section of chip by TEM as well as modeling of friction in presence of gaseous sulphur additive in the Environmentally Controlled Tribometer (ECT) are realized.
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Submitted on : Friday, April 2, 2010 - 8:00:00 AM
Last modification on : Friday, August 5, 2022 - 2:54:00 PM
Long-term archiving on: : Thursday, September 30, 2010 - 9:18:05 PM


  • HAL Id : pastel-00005599, version 1


Aleksandra Bierla. Usinage des aciers prétraités à l'huile entière - effets physico-chimiques des additifs soufrés. Sciences de l'ingénieur [physics]. Arts et Métiers ParisTech, 2009. Français. ⟨NNT : 2009ENAM0022⟩. ⟨pastel-00005599⟩



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