US 10,877,456 B2Granted

Numerical control apparatus and machining method

AssigneeMitsubishi Electric Corporation

InventorsTsuyoshi Kumazawa, Kazuya Nakajima

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Abstract

A numerical control apparatus includes: a thread-whirling motor controller controlling, based on a thread lead representing a movement amount of a thread whirling tool per rotation of a workpiece, a reference differential speed representing a difference between a predetermined reference rotational speed of the thread whirling tool and a rotational speed of the workpiece, the number of tool blades of the thread whirling tool, and a workpiece spindle speed representing the rotational speed of the workpiece, a first motor moving the thread whirling tool, a second motor rotating the thread whirling tool, and a third motor rotating the workpiece. The thread-whirling motor controller controls: the first motor based on the thread lead and the reference differential speed; the second motor based on the thread lead, the reference differential speed, the number of tool blades, and the workpiece spindle speed; and the third motor based on the workpiece spindle speed.

Claims16

Dependent claims

A numerical control apparatus comprising:

thread-whirling motor control circuitry configured to control, on a basis of a thread lead representing a movement amount of a thread whirling tool per rotation of a workpiece, a reference differential speed representing a difference between a predetermined reference rotational speed of the thread whirling tool and a rotational speed of the workpiece, a number of tool blades representing a number of blades of the thread whirling tool, and a workpiece spindle speed representing the rotational speed of the workpiece, a motor that moves the thread whirling tool, a motor that rotates the thread whirling tool, and a motor that rotates the workpiece,
wherein the thread-whirling motor control circuitry:
calculates movement speed of the thread whirling tool on a basis of the thread lead and the reference differential speed and controls the motor that moves the thread whirling tool such that the thread whirling tool moves at the calculated movement speed;
calculates rotational speed of a spindle of the thread whirling tool on a basis of the thread lead, the reference differential speed, the number of tool blades, and the workpiece spindle speed and controls the motor that rotates the thread whirling tool such that the thread whirling tool rotates at the calculated rotational speed;
and
controls the motor that rotates the workpiece on a basis of the workpiece spindle speed.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/349,297Filed 5 Mar 2018
Published: US 2020/0264579 A120 Aug 2020
Granted: 29 Dec 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

B23G 1/34
By milling: with a cutting bit moving in a closed path arranged eccentrically with respect to the axis of the rotating workpieces
G05B 19/186
Characterised by the machine tool function, e.g. thread cutting, cam making, tool direction control: generation of screw- or gearlike surfaces
G05B 19/232
The positional error is used to control continuously the servomotor according to its magnitude: with speed feedback only
G05B 19/414
Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to…