INVESTIGATION OF THE EFFECTS OF THE CUTTING PARAMETERS AND COOLANT ON THE SURFACE ROUGHNESS VALUE IN THE MACHINING OF AISI 4340 WITH CBN TOOLS
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Anahtar Kelimeler:
AISI 4340, hard turning, CBN, surface roughnessÖzet
With the heat treatment applied to the workpiece, the material gains are abrasion resistance, friction
resistance, thermal resistance and strength. However, hardening of the material makes to machining is
difficult. Advances in machine tool and CBN insert technology have facilitated the machining of hard
materials. Since CBN tools also prevent the increase of temperature, the use of coolant is not required.
In addition, achieving a grinding quality surface makes it possible to use hard turning as an alternative
to grinding. In this experimental study, AISI 4340 material with CBN tooling experiments which
were increased to 63 HRC hardness by heat treatment were applied. Cutting is done under cooling and
dry cutting conditions. Machining experiments were carried out at 3 different cutting speeds and 3
different feed rate at constant depth of cut. It was observed that surface roughness value increased with
increasing feed rate. It was observed that dry cutting conditions decreased the surface roughness value
in a small amount.
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Telif Hakkı (c) 2019 Euroasia Journal of Mathematics, Engineering, Natural & Medical Sciences
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