NUMERICAL CONTROLLER

• US 20180143612A1
• Filed: 11/20/2017
• Published: 05/24/2018
• Est. Priority Date: 11/21/2016
• Status: Active Grant

• Current Assignee: Fanuc Corporation
• Original Assignee: Fanuc Corporation
• Inventors: Watanabe, Tooru, Kubota, Tooru
• Granted Patent: US 10,459,424 B2
• Time in Patent Office: Days
• CPC Class Codes: G05B 19/186 Generation of screw- or gearlike surfaces
• CPC Class Codes: G05B 19/402 characterised by control arrangements for positioning, e.g. centring a tool relative to a hole in the workpiece, additional detection means to correct position G05B19/19 takes precedence
• CPC Class Codes: G05B 2219/31455 Monitor process status
• CPC Class Codes: G05B 2219/45216 Tapping

Abstract

Provided is a numerical controller capable of shortening cycle time while maintaining machining accuracy of a rigid tap. The numerical controller includes: a rigid tap control unit that executes a rigid tap by synchronizing rotational speed of a spindle with feedrate; a synchronization error monitoring unit that starts or terminates monitoring of a synchronization error between the rotational speed of the spindle and the feedrate at a point R set to a height equal to or higher than a top of a workpiece; and a workpiece top detection unit that detects a position of the workpiece top. The synchronization error monitoring unit starts monitoring the synchronization error at the position of the workpiece top instead of the point R.

Claims

1. A numerical controller comprising:

a rigid tap control unit that executes a rigid tap by synchronizing rotational speed of a spindle with feedrate;

a synchronization error monitoring unit that starts or terminates monitoring of a synchronization error between the rotational speed of the spindle and the feedrate at a point R set to a height equal to or higher than a top of a workpiece; and

a workpiece top detection unit that detects a position of the workpiece top,

wherein the synchronization error monitoring unit starts monitoring of the synchronization error at the position of the workpiece top instead of the point R.

2. A numerical controller comprising:

a rigid tap control unit that executes a rigid tap by synchronizing rotational speed of a spindle with feedrate;

a synchronization error monitoring unit that starts or terminates monitoring of a synchronization error between the rotational speed of the spindle and the feedrate at a point R set to a height equal to or higher than a top of a workpiece;

a workpiece top detection unit that detects a position of the workpiece top; and

a machine learning unit with learning such that the point R at which cycle time and the synchronization error on the workpiece top satisfy predetermined conditions is output for state data when at least the position of the workpiece top is input as the state data,

wherein the numerical controller, the synchronization error monitoring unit starts monitoring of the synchronization error at the point R output by the machine learning unit.

3. A numerical controller comprising:

a rigid tap control unit that executes a rigid tap by synchronizing rotational speed of a spindle with feedrate;

a synchronization error monitoring unit that starts or terminates monitoring of a synchronization error between the rotational speed of the spindle and the feedrate at a point R set to a height equal to or higher than a top of a workpiece; and

a workpiece top detection unit that detects a position of the workpiece top,

wherein the synchronization error monitoring unit terminates monitoring of the synchronization error at the position of the workpiece top instead of the point R.