Numerical control device for causing a tool to move along a movement path decided according to a machining program

A numerical control device for a machine tool which causes a tool to move along a movement path decided according to a machining program, the numerical control device comprising:

• a memory configured to store a program;
• and
• a processor configured to execute the program and control the numerical control device to function as:
• a limit setting storage unit in which limit values of a plurality of parameters related to movement of the tool are set;
• a limit velocity calculation unit which calculates a plurality of limit velocities which are movement velocities of the tool, which respectively correspond to the limit values of the plurality of parameters at each position of the movement path;
• a feedrate determination unit which defines a minimum value among an ideal velocity of the tool and the plurality of limit velocities at each position on the movement path as a feedrate of the tool at each position on the movement path;
• a deceleration recording unit which stores a type of the parameter corresponding to a case of the feedrate determination unit defining the limit velocity as the feedrate;
• an adjustment effect calculation unit which calculates variation in the time required in order for the tool to move an entirety of the movement path when changing a limit value of the parameter;
• and
• a speed controller which controls at least one servomotor so as to move the tool at each position on the movement path at the feedrate determined by the feedrate determination unit.