Numerically controlled machining method and system

A numerically controlled machining method comprising the steps of:

• finding production times for machining parts for all of numerical control orders that are input in a numerically controlled machine;
• comparing said production times with a reference value to classify the numerical control orders of which the production times are smaller than the reference value to be a group of special express processes and to classify other numerical control orders to be a group of normal processes, regarding said group of special express processings to be a group of machining methods giving importance to the degree of finish of machining of a part;
• classifying said group of normal processes to be either one of a group of machining methods for minimizing the number of times of exchanging molds to be used for machining, or a group of machining methods of optimizing a drawing number based upon the machining data of the group;
• and preparing numerical control machining data for each of the groups.

A numerically controlled machining system comprising:

• a plurality of numerically controlled machines arranged in accordance with the machining steps to be executed on parts;
• a plurality of controllers for respectively controlling said numerically controlled machines;
• and
• a numerically controlled processor which finds production times for all of numerical control orders that are input in the system, compares said production times with a reference value to classify the numerical control orders of which the production times are smaller than the reference value as a group of special express processes and to classify the numerical control orders of which the production times are larger than the reference value to be a group of normal processes, classifies the processes to be any one of a group of machining methods giving importance to the degree of finish for shortening the finishing period, machining methods for minimizing the number of times of exchanging the molds or machining methods of optimizing a drawing number by bringing the arrangement processing into consideration, whichever gives a higher machining efficiency based upon the machining data, prepares numerical control machining data for each of the groups, and distributes said numerical control machining data to said controllers.