Control device for a tool driving unit

Details Control device for a tool driving unit Control device for a tool driving unit

1991-04-02

1993-02-02

Wysocki, A. Jonathan

Electricity: motive power systems

Positional servo systems

Program- or pattern-controlled systems

318569, 318600, 318 39, 36442411, 36447415, 3644743, G05B 1918

Patent

active

051840537

ABSTRACT:
A control device for a tool driving unit is disclosed wherein a tool such as a tap or a drill is controlled to be rotated and axially moved by the control device. The tool driving unit has a spindle servo motor adapted to be driven according to a spindle current command and a feed shaft servo motor adapted to be driven according to a feed shaft current command which are provided by a single microcomputer which operates as the control device. The microcomputer reads an NC program and outputs a spindle command for the spindle servo motor when performing tapping, and outputs both the spindle command and a first feed shaft command for the feed shaft servo motor when performing drilling. A thread pitch changing controller for controlling a thread pitch outputs a second feed shaft command for the feed shaft servo motor when performing tapping. A tool selector receives the first feed shaft command and the second feed shaft command and outputs a selected feed shaft command based on the tooling operation being performed. The spindle and feed shaft servo motors are controlled based on the provided command(s) and by detecting actual angular positions and rotational speeds of the servo motors.

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Servo Control with Microprocessor, IBM Technical Disclosure Bulletin, vol. 31, No. 11, Apr. 1989, pp. 101-103.

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