Comparison of coated and uncoated carbide drill bits for drilling titanium grade 2 material

摘要

Manufacturing of components from casting, forging, welding and forming needs machining operation with close tolerance requirement for assembling purposes. In response, a lot of machining operations like turning, milling, grinding and drilling are utilized in manufacturing industries. Drilling is a machining processes, which is used to make a hole on component face. In view of this drilling is one of the important machining processes and has a considerable economical importance. Because it is usually among final steps in the machining of components. When machining a corner, the contact area of cutting tools and work piece varies rapidly which can cause the machining force to suddenly increase generating vibration in the cutting tool, work piece and machine tools. Which reduces the tool life and accuracy of the machined component. Monitoring of tool wear via vibration is very important. So this work concentrates on study about vibration, tool wear and accuracy of machined component. However, Drilling is a highly demanding machining process due to a) complex tool geometry and b) progressive material failure on the work piece. More over the manufacturing of deep holes with small diameter has to face problems to evacuate chips, this introduces frequent problems like incremental torque, tool failure and poor hole quality.