Methodology and tool design for high speed machining

摘要

A tool design methodology is provided for high speed machining tools for titanium alloys. The methodology includes providing a predetermined cutting criteria such as cutting speed and cutting depth. The geometry of the tool and work piece is modeled and discretized into desired sections. Cutting parameter such as instantaneous chip load per section and three dimensional forces per section are calculated. The heat parameters are calculated such as the heat generated on the shear and friction surfaces and the heat transfer across the work piece and tool interface. The temperature at the tool and work piece interface is calculated and the coolant parameters are adjusted to reduce the temperature at the interface. Coolant parameters may include the coolant flow angle relative to the interface, coolant impingement pressure at the interface, and the coolant flow rate at the interface. The temperature at the tool and work piece interface is again calculated to determine the coolant parameters that reduce the temperature thereby extending tool life. A high speed cutting tool may be provided according to the present invention that includes a shaft having a fluid passageway with the shaft being adapted to be secured to a chuck. The passageway terminates in a threaded aperture. A threaded fitting such as a pipe fitting is removably received in the threaded aperture with a nozzle at the end opposite the threaded aperture. The nozzle is in fluid communication with the passageway. The nozzle directs cooling fluid at the insert and work piece interface at a desired rate, pressure, and angle. The nozzle may be adjusted relative to the tool body to change the angle of the coolant upon the tool insert.