Numerical controller with machining time prediction unit and machining error prediction unit

摘要

In connection with a machining program used in machining a workpiece by means of a machine tool controlled by a numerical controller, interpolation data, a command position point sequence, and a servo position point sequence for each processing period are determined by simulation by designating speed data for giving a machining speed and precision data for giving a machining precision. A predicted machining time for workpiece machining is determined based on the determined interpolation data, and a predicted machining error for workpiece machining is determined based on the determined command and servo position point sequences. Further, the precision data and the speed data are determined for the shortest predicted machining time within a preset machining error tolerance, based on a plurality of predicted machining times and a plurality of predicted machining errors.

主权项

1. A numerical controller for drivingly controlling a machine tool which machines a workpiece based on a machining program, the numerical controller comprising:
a designation unit for designating speed data for giving a machining speed and precision data for giving a machining precision; a simulation unit which determines a command position point sequence and a servo position point sequence for each processing period by simulating a program analysis process, an interpolation process, a post-interpolation acceleration/deceleration process, and a servo operation, using the speed data and the precision data designated for the machining program by the designation unit; a machining time prediction unit which determines a predicted machining time during which the workpiece will be machined in the simulation unit; and a machining error prediction unit which determines a predicted machining error caused when the workpiece will be machined using the command position point sequence and the servo position point sequence determined by the simulation unit.