NUMERICAL CONTROL DEVICE, CONTROL PROGRAM AND CONTROL PROCEDURES

DE102020207868B4Active Publication Date: 2026-07-09FANUC LTD
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
FANUC LTD
Filing Date
2020-06-25
Publication Date
2026-07-09

AI Technical Summary

Technical Problem

Existing machine tools face issues with cutting tool vibrations leading to high cutting speeds, which can cause chattering vibrations, excessive load on the machine, and tool wear, especially during oscillating cutting processes.

Method used

A numerical control device and method that calculates and adjusts the spindle speed and vibration frequency to prevent the cutting speed from exceeding a predetermined upper limit, using a reference speed calculation unit, vibration command calculation, and adjustment unit to manage oscillation frequency and amplitude.

Benefits of technology

Prevents high cutting speeds by controlling the oscillation frequency, reducing vibrations, and optimizing machining accuracy and efficiency by adjusting spindle speed and vibration frequency to stay within safe limits.

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Abstract

Numerical control device (1) for controlling a machine tool (100), wherein the machine tool (100) comprises a spindle (Ac) for rotating a cutting tool (T) or a workpiece (W) which is a machining target, and a feed axis (Az) for moving the cutting tool (T) relative to the workpiece (W), and for causing the spindle (Ac) and the feed axis (Az) to interact to cut the workpiece (W) by means of the cutting tool (T), wherein the numerical control device (1) comprises: a reference speed calculation unit (14) configured to calculate a spindle speed, which is a speed of the spindle (Ac) according to a machine machining program, and a feed rate, which is a speed of movement of the feed axis (Az) according to the machine machining program;a vibration command calculation unit (15) configured to calculate a vibration command, which is a periodic variation component superimposed on a feed axis (Az) command, based on the spindle speed and feed rate, and a predefined vibration frequency amplification; a setting detection unit (13) configured to detect an upper limit for the frequency of the vibration command; and an adjustment unit (16) configured to adjust the frequency of the vibration command, or at least either the spindle speed or the vibration frequency amplification, so that the frequency of the vibration command does not exceed the upper limit.
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