Experimental investigation of tool wear and its effect on TiSiN-coated ball-end mill geometry in high-speed milling
Résumé
In this paper, an experimental investigation was carried out in order to identify the tool life of sintered carbide ball-end mill based on spindle speed variation. The used tool is coated with titanium silicon nitride “TiSiN” which is a high-hardened and high heatresistant coat. Experiments were conducted on parallelepiped plane workpieces on AISI 4142 during high-speed milling. Two kinds of tests were realized, the first is a wear experiment using high cutting parameters in order to identify the wear criterion model as a function of the spindle speed. The second one is an accelerated wear experiment to develop an empirical model for the tool life. The research revealed that the tool life and wear criterion value decrease when increasing the spindle speed. It is observed that the wear increases linearly in the normal wear zone. Furthermore, the effect of tool wear on the ball-end mill geometry and the cutting parameters were also investigated. A noticeable variation was found on the effective radius of the tool which affect the tool geometry such as the direction angles of the elementary cutting edge which results in the variation of the cutting parameters. An important effect also of the effective radius variation on the cutting speed was proved.
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