Equivalent Conversion of Machining Motion between Double Cutter Disks Gear Milling Machine Tool and Free-form Machine Tool
To realize the machining of straight bevel gears with a single cutter disk on a domestic CNC spiral bevel gear machining machine,based on the principle of spatial kinematics,and on the premise of ensuring that the relative position and relative motion relationship between the workpiece axis and the cutter disk axis remain unchanged,the relative position and relative motion relationship between the cutter disk and the workpiece in the double cutter disk gear milling machine tool are equivalent converted to the Free-form machine tool,and the motion expressions of each numerical control axis of Free-form machine tool with time as independent variable are obtained;The position coordinates of the motion axis of the Free-form machine are calculated at each machining moment by Matlab and the NC machining program is written;based on Vericut simulation software,a Free-form machining environment is established and the machining process is simulated.The simulation results verified the correctness of the motion conversion method and CNC machining program;The milling tooth machining experiment is conducted on the actual Free-form machine tool,and the tooth profile error of the actual tooth surface of the experimental workpiece relative to the theoretical tooth surface is detected by the gear measurement center,and the tooth profile error is within 10.8 pm;the contact area of the gear pair is inspected by rolling inspection machine,and the actual meshing contact area is consistent with the TCA result.The results of simulation machining and actual gear cutting machining experiments verify the correctness of the equivalent conversion method for machine tool machining motion.
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