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Fig. 3. The comparison of the total average drilling forces.


In comparison, the 396-G3 alloy presents greater fl uctuations in drilling force and torque values. In the case of the special solid carbide drill, the drill broke after 1,728 holes in the 396-G3 alloy and after 1,809 holes in the 396 G-2 alloy, without completing the tar- geted goal of 2,016 holes. T e targeted goal had been met by the cobalt grade and high precision solid carbide drills in the drilling process. T e four tools’ lives in terms of


Fig. 4. The comparison of the total average drilling torques.


holes drilled for each alloy is shown in Table 4. T e addition of tin to the G2 and G12 alloys provided the desired drilling results in terms of holes drilled. For both alloys, the targeted number of 2,016 holes was achieved, with the exception being the special solid carbide drill that only drilled 1,809 holes in the 396-G2 alloy. T e values marked with an asterisk in the table indicate the drills broke before the end of the test.


44 | METAL CASTING DESIGN & PURCHASING | Sept/Oct 2013


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