Tool Temperature in Titanium Drilling

Abstract

The spatial and temporal distribution of tool temperature in drilling of commercially pure titanium is studied using the inverse heat transfer method. The chisel and cutting edges of a spiral point drill are treated as a series of elementary cutting tools. Using the oblique cutting analysis of the measured thrust force and torque, the forces and frictional heat generation on elementary cutting tools are calculated. Temperatures measured by thermocouples embedded on the drill flank face are used as the input for the inverse heat transfer analysis to calculate the heat partition factor between the drill and chip. The temperature distribution of the drill is solved by the finite element method and validated by experimental measurements with good agreement. For titanium drilling, the drill temperature is high. At 24.4 m/min and 73.2 m/min drill peripheral cutting speed, the peak temperature of the drill reaches 480°C and 1060°C, respectively, after 12.7 mm depth of drilling with 0.025 mm feed per cutting tooth. The steady increase of drill temperature versus drilling time is investigated.

Wear Mechanisms and Wear Model of Carbide Tools during Dry Drilling of CFRP/TiAl6V4 Stacks

“…This means that during the drilling of the stack, in the Ti part, and depending of the cutting conditions, temperatures between 400 and 800 °C can be easily reached at the contact between the drill and the chip when in the Ti alloy plate alone—this temperature ranges from 200 to 400 °C. These results are in accordance with previous works [21,24,30].…”

“…The diffusion path could be CW/ (Ti,W)C/ Ti. Some studies noted temperatures between 600 and 1200 °C during the dry machining of titanium alloy [30]. The temperature measurements performed in this study confirm these data and the contact temperature between the tool and the chip is likely to range from 300 to 800 °C, depending on the cutting conditions and the material which is drilled, Ti alloy alone or CFRP/Ti stacks.…”

Evaluation of Workpiece Temperature during Drilling of GLARE Fiber Metal Laminates Using Infrared Techniques: Effect of Cutting Parameters, Fiber Orientation and Spray Mist Application

“…There has been a significant amount of studies which looked into the effect of cutting parameters and coolants on the maximum temperature during machining process for various metals including steel [ 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ], aluminum alloys [ 17 , 25 , 34 , 40 , 41 , 42 , 43 , 44 ], titanium mainly Ti6Al64 alloy [ 43 , 45 , 46 ] and, to a lesser extent, other material, such as magnesium alloy [ 47 ]. While studies on temperature measurements of composite [ 15 , 23 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 ] and composite metal stacks machining [ 23 , 50 , 60 ] have surged in the past few years, there have been no reported studies on temperature measurements on machining FMLs.…”

Investigation on performance characteristics and metallographic transformation on drilling aluminium/titanium sandwich

“…However, chips in drilling continue to flow out along spiral flute when they leave cutting edge. During flowing process, chips will change their direction and suffer further deformed by the extrusion of tool flute and workpiece [33–34]. The morphology of the titanium alloys chips generated at cutting speed of 40 m/min and feed rate of 0.1 mm/r is shown in Figure 7.…”