| abstract |
A numerical control apparatus (1) is provided with: a phase difference calculation unit (481) which, when a path of movement for machining with vibration is to be formed, calculates, from a vibration-amplitude-to-feed ratio, a phase difference which corresponds to the difference between a vibration-induced forward position and a vibration-induced backward position that is obtained by subtracting the vibration amplitude from the vibration-induced forward position, wherein the vibration-amplitude-to-feed ratio is the ratio of the vibration amplitude to the rate of feed of the tool relative to the object to be machined, and wherein the vibration-induced forward position varies with time and follows a path of movement determined on the basis of a command block; a movement path generation unit (482) which, on the basis of the phase difference, obtains, for each drive axis, a path of movement formed by the vibration-induced forward position and a path of movement formed by the vibration-induced backward position; a vibration waveform generation unit (483) which, on the basis of vibration conditions, generates, for each drive axis, a reference vibration waveform to be superimposed on each path of movement; a vibration distance generation unit (484) which calculates, for each drive axis, the vibration distance along each path of movement using the reference vibration waveform; and a travel distance combination unit (485) which generates, for each drive axis, a combined travel distance by combining the vibration distance with each path of movement. |