Evaluation of work piece temperature measurement techniques for milling of Ti6Al4V
The original publication is available at http://www.isem.org.za/index.php/isem/isem2011.
Conference of the ISEM 2011 Proceedings, Stellenbosch, South Africa, 21 - 23 September 2011.
Conference theme - Innovative Systems Thinking: Unravelling Complexity for Successful Solutions.
Ti6Al4V is one of the most widely used titanium alloys in aerospace applications, but its machining remains a challenge. This is partly due to the lack of understanding of the thermal- and mechanical constraints during milling. Extensive research has been done in the past investigating catastrophic tool failure of various tool materials. However, not much research has been done to investigate the cause of work piece failure. The catastrophic effect of overheating the work piece and the resulting alpha case formation in titanium is well known. Current techniques of temperature measurement of the machined surface can be divided into two categories: contact- and optical methods. In this study these temperature measurement techniques were studied and evaluated. The response time of contact methods are found to be to relatively slow. The optical methods have the advantage of immediate response, allowing capture of intermittent heat generation as required in milling. The infrared camera temperature measurement experiments were conducted with a special setup in order to have a good visual of the temperature flow. The results of these experiments were found to correspond with literature.