OVERVIEW OF WORK PIECE TEMPERATURE MEASUREMENT TECHNIQUES FOR MACHINING OF Ti6Al4V#

Abstract

Ti6Al4V is one of the most widely used titanium alloys in aerospace applications, but its machining remains a challenge. Comprehensive research has been done in the past, mainly investigating tool failure of various materials. Less research has been done to investigate the thermal effect of machining on work piece quality, including fatigue performance. Temperature measurement is considered to be a key enabling technology. This study presents an overview of current temperature measurement techniques for machined and tool surfaces. Two categories of methods were investigated: slower contact, and faster optical methods. Optical fibre two colour pyrometry experiments are reported that demonstrate the technique's adequate response time. The infrared camera temperature measurement experiments synchronised temperature measurement with visual observation, aimed at mechanism analysis. The results corresponded with the literature. OPSOMMINGTi6Al4V is een van die mees gewilde lugvaart allooie, maar sy masjinering is 'n uitdaging. Bestaande navorsing dek beitelslytasie omvattend. Die termiese effek van masjinering op werkstuk integriteit, insluitend vermoeiingleeftyd, het egter veel minder dekking geniet. Temperatuurmeting wat in hierdie studie ondersoek word, word as 'n sleuteltegnologie beskou. Twee kategorië metodes is ondersoek, nl stadige kontakmetodes en optiese metodes met vinnige respons, wat die meting van oorgangsverskynsels moontlik maak. Eksperimentele werk wat beide optiese vesel tweekleurpirometrie en termiese kamera tegnieke insluit bewys die tegnieke as geskik vir die benodigde navorsing. a a a a a a a a a a a a 1 The author was enrolled for an MScEng (Engineering Management) degree in the

Precision Hard Turning of Ti6Al4V Using Polycrystalline Diamond Inserts: Surface Quality, Cutting Temperature and Productivity in Conventional and High-Speed Machining

“…This reflects the low thermal conductivity of the titanium alloy which retained the heat in the cutting zone area and prevented dissipation of the heat generated during cutting. The results agree with [ 62 ], where the authors used an infrared camera to measure the temperature distribution when machining Ti6Al4V. It was reported that the high temperature generated due to cutting did not penetrate deep into the machined material and most of the heat was carried away by the chips.…”

“…At low feed rates, Figure 9 b, it was found that surface roughness was greater for the highest cutting speed (350 m/min) than for the lower cutting speed of 300 m/min. This slight increase in surface roughness was attributed to chatter which, for high-speed cutting dominates in the case of a low feed rate [ 62 ].…”

Optimization of Process Parameters During End Milling and Prediction of Work Piece Temperature Rise

“…In operations like milling and grinding, where the tools are revolving at very high speeds, the task of temperature measurement becomes even more difficult. In the literature, [36][37][38][39][40][41][42], variety of methods were suggested and used for the measurement of temperature during machining. Calorimetric method, use of tool-work thermocouples, embedded thermocouples; single wire thermocouple, infrared thermometers, infrared cameras and PVD film were in some of the methods used for measurement of temperature during machining.…”

Determination of Significant Parameters and Their Contributions In Temperature Measurement using Analysis of Variance and Taguchi Method

“…Most of the thermocouples today are manufactured from two dissimilar materials welded together. A wide variety of materials is suitable for thermocouple manufacturing, and each material pair has different characteristics of temperature range and voltage that classifies thermocouples in types [6]. Nowadays, thermocouples with a wide variety of size and accuracy have been produced.…”