Tool path generation method and machine tool using rate of change of curvature based smoothing

A machine tool comprising a control device that generates a second tool path by performing smoothing treatment on a first tool path set by a first machining program, in the first tool path movement points, each associated with a coordinate value, being connected by straight lines,

• wherein the control device includes:
• a movement point setting part that identifies the movement points based on the first tool path;
• a rate-of-change calculation part that calculates a rate of change in curvature of the first tool path at each of the movement points;
• a weight setting part that calculates a weight of a moving average at each of the movement points based on the rate of change in the curvature of the first tool path at each of the movement points;
• the moving average being based on the respective movement point and a number of adjacent movement points on the first tool path and the weight, and the weight comprising a weight distribution that is adjusted so that smoothing increases as the corresponding rate of change of curvature increases;
• a movement point correction part that calculates a coordinate value of the moving average of each of the movement points by using the weight at each of the movement points and coordinate values of the movement point and the number of adjacent movement points, and sets the coordinate value of the moving average of each of the movement points as a coordinate value of a corresponding movement point of the second tool path;
• and
• a program generation part that generates a second machining program based on the coordinate values of the movement points of the second tool path;
• and
• wherein the machine tool is configured to machine the workpiece based on the second machining program.