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Licensed Unlicensed Requires Authentication Published by De Gruyter November 18, 2015

Effects of burnishing parameters on the quality and microhardness of flat die surfaces

Auswirkungen der Polierparameter auf die Qualität und die Mikrohärte von flachen Pressformoberflächen
  • Hikmet Sadi Müftüoğlu and Elif Malyer
From the journal Materials Testing

Abstract

In this study, the burnishing process is recommended as finishing operation of flat die surfaces for improving not only surface quality but also mechanical properties of milled die surfaces. This technique can be applied after milling operations in CNC milling centers with a single fastening that increases the accuracy of the die geometry. To determine both the usability of the process on flat die surfaces and the influence of process parameters, a simple burnishing tool with a fixed deformation element was designed and constructed. The CNC milling center was used for burnishing operations. The burnishing process was employed using a constant spindle speed on a flat surface. Burnishing feed rate, stepover, penetration depth, the number of passes, burnishing direction and coolant were chosen as process parameters. First, optimum parameters were stated, then macro and microstructure of the burnished surfaces were examined, and roughness and hardness measurements of surfaces were carried out. Results show that burnishing increased the surface quality and microhardness of flat milled surface. The penetration depth has the maximum and stepover has the minimum effect on surface quality. The coolant has the highest effect on microhardness. The burnishing direction has a significant effect on both microhardness and surface quality. It can be briefly stated that burnishing is an economic and feasible surface treatment process for finishing operations of die surfaces.

Kurzfassung

In dem vorliegenden Beitrag wird das Polieren als Finishingprozess für flache Pressformen empfohlen, um nicht nur die Oberflächenqualität, sondern auch die mechanischen Eigenschaften der gefrästen Pressformoberflächen zu verbessern. Diese Technik kann nach dem Fräsen in CNC-Bearbeitungszentren mittels Befestigung angewandt werden und erhöht die Genauigkeit der Formgeometrie. Um beides zu untersuchen, die Anwendbarkeit des Prozesses auf flache Pressformoberflächen und den Einfluss der Prozessparameter, wurde ein einfaches Polierwerkzeug mit einem festen Deformationselement entworfen und konstruiert. Das CNC-Bearbeitungszentrum wurde für den Polierprozess eingesetzt. Der Polierprozess wurde bei konstanter Spindelgeschwindigkeit auf einer flachen Oberfläche durchgeführt. Als Prozessparameter wurden die Polierzufuhrgeschwindigkeit, die Eindringtiefe, das Überlappen, die Zahl der Durchgänge, die Polierrichtung und das Kühlmittel gewählt. Hierbei wurden zunächst die optimalen Parameter bestimmt und dann Messungen der Rauheit und der Mikrohärte der Oberflächen durchgeführt. Die Ergebnisse zeigen, dass das Polieren die Qualität und die Mikrohärte der gefrästen flachen Oberflächen erhöht. Die Eindringtiefe hat den größten und das Überlappen den geringsten Effekt auf die Oberflächenqualität. Hinsichtlich der Mikrohärte hat das Kühlmittel den größten Effekt. Die Polierrichtung hat auf beides, die Mikrohärte und die Oberflächenqualität, einen signifikanten Einfluss. Der Polierprozess stellt einen ökonomischen und technisch durchführbaren Prozess als Finishingschritt für die Formoberflächenbehandlung dar.


§Correspondence Address, Assistant Professor Dr. Elif Malyer, Celal Bayar Üniversity, Turgutlu Vocational School, Department of Machine and Metal Technologies, 45400 Turgutlu Manisa, Turkey. E-mail: ,

Hikmet Sadi Müftüoğlu, born in 1988, completed his Bachelor's degree in the Mechanical Engineering Department of Pamukkale University, Denizli, Turkey, in 2012, and his Master of Science degree at the Graduate School of Natural and Applied Sciences of Celal Bayar University, Manisa, Turkey, in 2015.

Assistant Prof. Dr. Elif Malyer, born in 1978, completed her Bachelor's degree in the Technical Education Faculity of Gazi University, Ankara, Turkey, in 1999, and her Master of Science degree in the Department of Engineering Sciences at Graduate School of Natural and Applied Sciences of Celal Bayar University, Manisa, Turkey, in 2001. In 2010, shefinished her PhD in the Department of Engineering Sciences of the Graduate School of Natural and Applied Sciences of Uludağ University in Bursa, Turkey. Currently, she is working in the Department of Machine and Metal Technologies of Turgutlu Vocational School, at Celal Bayar University, Manisa, as Assistant Professor. Her research focus lies on the wear of cutting tool and incremental sheet metal forming.


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Published Online: 2015-11-18
Published in Print: 2015-11-16

© 2015, Carl Hanser Verlag, München

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