Abstract
The productivity of machining operations can be increased and the quality of products can be improved by using higher cutting speeds than applied conventionally. However, High-Speed Milling (HSM) is much more than just the high revolution speed of the spindle of the machine tool. In this paper utilization of HSM in the manufacturing of the products made of different advanced materials is described. Results are based on the collaborative investigation performed by VTT and HUT in close cooperation with Finnish industry. Utilizing HSM in manufacturing of electrodes for electric discharge machining (EDM) does not permit the special properties of graphite as a workpiece material to be ignored. However, high chip removal volumes with economical tool life for relatively small end mills can be achieved when milling electrodes involving precise details. Polymer-matrix composites such as carbon and glass fibre, which are usually considered difficult or even impossible to machine, have been high-speed milled by using advanced carbide and diamond tools. Tests for materials used typically in model and prototyping manufacturing have been performed in order to determine the minimum reliably achievable thickness/height -ratio for thin ribs. The most interesting application field of HSM is the finishing operations of tool steels. Products made of hardened tool steel and comprising three-dimensional surfaces have successfully been milled with special cubic boron nitride (CBN) end mills without any significant tool wear.
Published Version
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