Kriyojenik Soğutma İşlemi Uygulanmış Aısı 4140 Malzemenin Cbn Takımla İşlenmesinde, Yüzey Pürüzlülüğü Ve Takım Aşınması Etkilerinin İncelenmesi

Yavuz M. (Executive)

Project Supported by Higher Education Institutions, 2020 - 2020

  • Project Type: Project Supported by Higher Education Institutions
  • Begin Date: January 2020
  • End Date: July 2020

Project Abstract

Hard turning is nowadays a widely used method in machining industries for machining hardened steel. While this method offers high processing efficiency and green environmental protection, it also enables the efficient use of energy. It is possible to increase the strength of machine parts three times with heat treatment. With heat treatment, the hardness value of the material increases with increasing strength. Increased hardness value also increases tensile strength, friction and wear resistance. Within the scope of this project, hard turning of the material, whose mechanical and chemical properties have been improved with the chroyogenic cooling method, has been investigated. Thus, it is aimed to achieve optimum advantages of hard turning above with appropriate process parameters. Mechanical and chemical properties of AISI 4140 material were compared before and after cryogenic treatment. For this, firstly, the hardness value of 60-65 HRC is given to the material. Then, chromyogenic cooling was applied at -200 degrees for 12 hours. Later, this material was reached to a hardness value of 55 HRC by applying a 2-hour tempering process at 250 degrees. Hard turning was performed with the material whose mechanical and chemical properties were improved by cryogenic process. In the experiments, 3 different feed rates, 3 different cutting speeds and 3 different depths of cut were used. At the end of the experiment, surface roughness, cutting force, sound level and power consumption were evaluated. In this study, where more than one performance criteria is evaluated, the Axiomatic Design method was used for optimization. Finally, wear experiments were carried out to see the effects of cryogenic process on tool wear.