Experimental Investigation of Heat Transfer in Titanium Alloy Ti-6Al-4V during Turning for Different Machining Conditions

Abstract

Heat has critical influences on machining. To certain extent, it can increase tool wear and then reduce tool life, get rise to thermal deformation.  But  due  to  the  complexity  of machining  mechanics,  it's  hard  to  predict  the  intensity  and distribution  of  the  heat  sources  in  an  individual  machining operation.  This  study  deals  with  heat  generation  during machining  process  and  the  experimental  investigation  of temperature.  Elevated  temperatures  generated  in  machining operations  significantly  influence  the  process  efficiency  and the surface quality of the machine part. The overall heat transfer between  the  chip,  the  tool,  and  the  environment  during  the  metal machining  process  has  an  impact  on  temperatures,  wear mechanisms and hence on tool-life and on the accuracy of the machined  component.  This  study  deals  with  experimental study  of  different  cooling  methods  for  different  machining conditions.  In  this  presented  work  cooling  has  been determined  by  calculating  the  heat  transfer  coefficient. Experiments  on  work  piece  cooling  conducted  on  a  CNC  provided  reference  temperature  data  for  a  model  of  a cylindrical  work  piece,  which  was  solved  for  temperature using  a  mathematical Equation’s.  Heat transfer  coefficients  were  obtained  for  various  convective boundary conditions existing on a work piece when cooling in VTJA  air  and  in  MQL coolant.  The calculated Cooling characteristics using these heat transfer coefficients has showed good agreement with the experiment.