High Strength Steel solutions for powertrain applications
TypeCommunications avec actes
ArcelorMittal focuses on both mechanical performances and machinability while designing new steel grades. ArcelorMittal has developed specific programs for machinability testing in turning, low and high speed drilling and gear machining. Machinability is evaluated through cutting forces, chip shape, surface quality and tool life. Gear machining is one of the main machining operations involved in powertrain manufacturing operations. The literature proposes many papers dealing with this process however there are too few studies interested in steel machinability evaluation while gear machining. This paper focuses on a particular gear manufacturing process, i.e. gear hobbing, and more precisely on steel machinability for gear hobbing applications. Tools as well as kinematics of gear hobbing are quite complex. This paper proposes a comprehensive experimental protocol for machinability testing. This protocol is based on a European standard. Tests are performed on a machine tool using a commercially available cutting tool. Tests provide the range of cutting conditions for five different steel grades. Both steels have a ferrite-pearlite structure with yield stress from 530 to 800 MPa and ultimate tensile stress from 680 to 900 MPa. Four grades are devoted to bar machining. The last one is devoted to forming and then machining operations. Many metallurgical solutions are investigated to enhance machinability such as lead addition or increase in sulfur content or calcium treatment. This paper analyses the influence of steel composition and structure on machinability. It shows the relevance of metallurgical solutions for machinability enhancement even for powertrain applications. Cutting conditions clearly depend on the metallurgical solution even if specific cutting force is finally close. The main difference is found on tool wear with tool life ratio from 1 to 1.5.
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BOMONT-ARZUR, Anne; CONFENTE, Mario; BOMONT, Olivier; SCHNEIDER, Emmanuel; LESCALIER, Christophe; BOMONT-ARZUR, Anne (Inderscience Publishers, 2007)The gain of productivity in machining is generally sought through tools and/or cutting conditions optimization however an increase in productivity is achievable too through the workmaterial optimization. The metallurgical ...
BOMONT-ARZUR, Anne; CONFENTE, Mario; SCHNEIDER, Emmanuel; BOMONT, Olivier; LESCALIER, Christophe; BOMONT-ARZUR, Anne (Technische Universität Darmstadt, 2008)Intensive weight savings and out-sizing programs are developed in automotive industry and lead to increase the mechanical properties of the material of the automotive parts. ArcelorMittal has developed specific steel grades ...
LESCALIER, Christophe; BOMONT, Olivier; BOMONT-ARZUR, Anne (ENIM Editions, 2010)This paper focuses on machinability especially in drilling. It is usually estimated experimentally based on thrust force and torque measurements, chip morphology analysis, surface quality and tool wear tests. A specific ...
Experimental study of Built-Up Layer formation during machining of High Strength free cutting steel DESAIGUES, Jean-Edouard; LESCALIER, Christophe; BOMONT-ARZUR, Anne; DUDZINSKI, Daniel; BOMONT, Olivier (Elsevier, 2016)Machinability of high-strength steels can be improved without degrading the mechanical properties using metallurgical solutions to create or retain non-metallic inclusions. Such a metallurgical treatment usually leads, ...
High Strength Steel solutions for automotive parts : State of the art of machinability enhancement and further developments DESAIGUES, Jean-Edouard; LESCALIER, Christophe; BOMONT-ARZUR, Anne; BOMONT, Olivier (Technische Universität Darmstadt, 2013)For many decades ArcelorMittal has been developing solutions to enhance machinability of high strength steels for automotive parts. Many well-known metallurgical solutions create or retain inclusions in the metal and then ...