Table 3. Force coefficients
Coated Tool
Un coated tool
𝐊
𝐭𝐜
(
𝐍 𝐦𝐦
𝟐
⁄
)
6985.6 7227
𝐊
𝐭𝐞
(𝐍 𝐦𝐦
⁄
)
6.1 7.815
𝐊
𝐧𝐜
(
𝐍 𝐦𝐦
𝟐
⁄
)
5060 5586
𝐊
𝐧𝐞
(
𝐍 𝐦𝐦
⁄
)
2.25 3.95
4
Experimentation
Fig. 7. Experimental setup b
A axis hybrid micro machining center (Mikrotools, DT-110) has been used for the micro milling experiments as shown in figure 7. During each experiment, anew TiAlN micro tool having 500 m dimeter, 30 degree helix angle, 10 degree rake angle, 5 degree clearance angle and 4 m edge radius has been used. All the experiments have been carried out at spindle speed 20,000 rpm, depth of cut of 30 m and 3 level of feed rate viz. 1, 2, 3 m tooth. Cutting force data has been acquired by a tri-axial mini dynamometer (Kistler, C) and a data acquisition system (Kistler, 5697) by considering sampling frequency as 10000 Hz. Further, to avoid the unwanted noises a low pass filter of 50 Hz has been set in the data acquisition system. Cutting tool run out value has been measured by laser displacement sensor (RF, Riftek) and run out angle has been obtained by the model proposed by Sahoo and Patra [15].
10 Share with your friends: |
