Numerical control apparatus

A numerical control apparatus comprising:

• an evaluating section for forming evaluation data of an evaluation point containing a distance to a succeeding evaluation point, by arranging virtually a process applying portion of a system to be numerically controlled on a given scheduled path locus to come into contact with a processed surface of a processing object and by setting a plurality of evaluation points to evaluate a shape of the processed surface;
• a command speed deciding section for deciding a command speed, at which the process applying portion is moved, by deciding necessity of a deceleration based on the evaluation data;
• and
• a process applying portion position data forming section for calculating an evaluation point such that a path length that is a sum of distances obtained by adding successively distances to a succeeding evaluation point in the evaluation data of respective evaluation points exceeds a predetermined length while using a succeeding evaluation point closest to a current process applying portion position as an initial point, then searching a process applying portion position, that is separated from the current process applying portion position by a predetermined distance, by arranging virtually the process applying portion to come into contact with the processed surface while using this calculated evaluation point as a starting point, and then providing this searched process applying portion position to the system to be numerically controlled.

A numerical control apparatus comprising:

• an evaluating section for forming evaluation data of an evaluation point containing a pointer representing a position of a succeeding clamp point, a path length to the succeeding clamp point, and a passing speed of a process applying portion to be passed through the evaluation point if the evaluation point corresponds to a clamp point, by arranging virtually the process applying portion of a system to be numerically controlled on a given scheduled path locus to come into contact with a processed surface of a processing object and by setting a plurality of evaluation points to evaluate a shape of the processed surface, where the clamp point signifies the evaluation point that is decided based on the shape of the processed surface such that the passing speed of the process applying portion passing through the evaluation point is subjected to restriction;
• a command speed deciding section for deciding a command speed, at which the process applying portion is moved, by calculating a distance from a current process applying portion position to a closest succeeding evaluation point and then deciding necessity of a deceleration based on a path length from the current process applying portion position to the succeeding clamp point, that is calculated by reading the path length to the succeeding clamp point in evaluation data of the closest succeeding evaluation point and then adding such path length to this distance, the passing speed in the evaluation data of the clamp point, that is calculated by employing the pointer in the evaluation data of the closest succeeding evaluation point, and a speed of the current process applying portion;
• and
• a process applying portion position data forming section for calculating an evaluation point such that a path length that is a sum of distances obtained by adding successively distances to a succeeding evaluation point in the evaluation data of respective evaluation points exceeds a predetermined length while using a succeeding evaluation point closest to a current process applying portion position as an initial point, then searching a process applying portion position, that is separated from the current process applying portion position by a predetermined distance, by arranging virtually the process applying portion to come into contact with the processed surface while using this calculated evaluation point as a starting point, and then providing this searched process applying portion position to the system to be numerically controlled.