JPH0272419A - Main shaft controller - Google Patents

Abstract

PURPOSE:To perform the positioning control at an optional position and in the optional direction by reading the revolving direction and the position information into an orientation circuit based on the calculation signal which commands the positioning control. CONSTITUTION:When a pulse coder 6 is added to a spindle 7 to perform the positioning control of the spindle 7, the target position data P for orientation control of the spindle 7 which is equal to the position information inputted first in the rise timing of the positioning signal commanding the positioning control is read into an orientation circuit 5. Then the spindle 7 is turned from the initial point before the next timing by an angle equivalent to the data P. In this case, the rise of a calculation signal commanding the positioning control is detected and a revolving direction signal is read into the circuit 5 together with the position increase data showing the next stop position. Based on these information, the spindle 7 is turned up to an optional position in the optional direction. Thus the positioning is possible in the optional revolving direction for the spindle 7.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a main spindle control device that controls the positioning of a main spindle in a machining area Ill.

(Prior Art) A typical NC lathe or the like is equipped with an orientation function that stops the main spindle at a constant rotational angle position in order to perform automatic tool exchange on the main spindle on which a tool is attached or removed. Furthermore, depending on the type of machining, it is necessary to position the cutting edge of the tool at a predetermined angle when the spindle is stopped, so the spindle motor is provided with a positioning control function. In this case, a pulse coder attached to the spindle for position detection is used, but when the spindle is stopped at a predetermined position by spindle orientation control and is further rotated to the next stop position, the direction of rotation is determined by the orientation control. The direction was determined.

(Problem to be Solved by the Invention) In such conventional position control systems, the target position for positioning control is based on the detection point of the one-rotation signal that serves as the origin signal during orientation control, and There may be cases where the rotation direction to the target position is opposite to the direction of orientation, resulting in a closer rotation. In other words, if the rotation direction is made to match the direction during orientation control, the machining cycle time will become unnecessarily long. However, in boring operations, etc., if a nearby direction is specified, interference with the workpiece may occur depending on the stop position of the tool, making positioning control difficult.

The present invention was made to solve the above problems, and
It is an object of the present invention to provide a spindle control device that enables positioning in any rotational direction when controlling the positioning of a tool using a spindle motor.

(Means for Solving the Problems) According to the present invention, in a spindle control device that rotationally drives a spindle using a position control loop to control orientation and also controls positioning of the spindle, a sensor detects an indexing signal that commands positioning control. storage means into which stop position data and rotation direction data of the spindle are read;
It is possible to provide a spindle control device characterized by comprising command means for commanding the positional deviation and rotation direction to the position control loop based on the stored data.

(Function) In the spindle control device of the present invention, after spindle orientation control, detects, for example, an up edge of the indexing signal,
The position deviation within the position control loop is set from the read stop position data and rotation direction data, and the main shaft is positioned and controlled in any commanded rotation direction.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the overall configuration of a position control system including an orientation circuit. The NCCW1 is connected to the spindle servo unit 3 via the high-voltage sequence circuit 2.
It supplies the necessary control information to the spindle motor 4.
The spindle servo unit 3 controls the rotation at a predetermined command speed, and the orientation circuit 5 performs spindle orientation control.

The spindle orientation function is to stop the spindle 7 at a constant rotational angle position using a position control loop of the spindle 7 that has a position detection means such as a pulse coder 6. It detects a positioning signal (ORCM) that commands positioning control, and With the rotation angle data given based on the position,
The tool 8 attached to the main shaft 7 is stopped.

The spindle motor 4 is connected to a main shaft 7 by a gear or a belt, and the main shaft 7 is directly connected to a pulse coder 6.
Alternatively, they are connected in a 1:1 relationship by gears or timing belts. The position information of the pulse coder 6 is manually inputted to the NC device 1 via the orientation circuit 5.
Based on this, the NC device 1 generates an index signal (INDX) that commands positioning control.

The orientation circuit 5 is provided with a storage area in which, when an index signal is supplied, it is detected and the stop position data and rotation direction data of the main @7 are read. That is, the terminal CN of the orientation circuit 5
C is for receiving the 12-pit binary signal (D11 to Do) as an external command signal for the stop position.
This terminal CNC is directly connected to the high-voltage sequence circuit 2.

Note that the terminal CNA is connected to the pulse coder 6 to form a position control loop, and the terminal CNB is connected to the NC device 1.

FIG. 2 is a timing chart showing an example of positioning control. In the spindle control device with the above configuration, when the spindle 7 is provided with the pulse coder 6 and spindle positioning control is performed, this is the position information that is first input at the rising timing (tl) of the ORCM signal that commands the positioning control. Target position data pb for spindle orientation/control is read into a predetermined storage area of the orientation circuit 5.

Then, by the next timing t2, as shown in FIG. 3, the spindle 7 rotates by an angle corresponding to the position data Pb from the initial point Pa, and then the rise of the INDX signal that commands positioning control is detected. Then, the rotation direction signal (ROT8) is sent along with the position increment data indicating the next stop position.
is loaded. Then, according to this information, the rotation angle W1 is rotated clockwise (CW) by the next timing t3.
Only rotate the main @7.

Furthermore, when the INDX signal is supplied from the NC device 1, positioning control is performed by rotating the main shaft 7 in an arbitrary rotation direction to an arbitrary position based on the rotation direction and position information commanded at that time. Become. FIG. 4 is a flowchart showing the procedure of such positioning control. In step a of spindle orientation control, the initial point Pa
The positioning control further includes step b, which captures the up edge of the indexing signal after rotating to pb, reads the rotation angle data and rotation direction data, and determines the position. Step C1 of setting the positional deviation in the error amplifier etc. of the control loop, and setting the spindle motor 4 so that the positional deviation becomes black.
It consists of step d of commanding.

In this way, after controlling the spindle orientation, the rotation direction from the current stop position to the next target position is specified, so it is possible to rotate in the near vicinity, and if necessary, specify the rotation direction in the far rotation. You can also.

Although the gist of the invention has been explained above with reference to the specified embodiments thereof, it is clear that various modifications or changes can be made to the invention based on what has already been described.

(Effects of the Invention) As explained above, according to the present invention, the rotation direction and position information are read into the orientation circuit based on the index signal that commands positioning control, and the one rotation signal at the time of orientation is detected. It becomes possible to control positioning from a point to any position and direction, shortening the cycle time, and providing a spindle control device that is effective in preventing interference between the tool cutting edge and the workpiece.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing one embodiment of the present invention, the second section is a timing diagram showing an example of positioning control, Fig. 3 is an explanatory diagram showing the rotational position of the main shaft, and Fig. 4 is the same. It is a flowchart which shows the procedure of positioning control of an example. DESCRIPTION OF SYMBOLS 1...NC device, 3...Spindle servo unit, 4...Spindle motor, 5...Orientation circuit, 6...Pulse coder, 7...Main shaft. Patent applicant FANUC Corporation

Claims (1)

[Claims] In a spindle control device that rotationally drives the spindle using a position control loop to control orientation and position the spindle, a detection means that detects an index signal that commands positioning control, and data on the stop position and rotational direction of the spindle are read. A spindle control device comprising: a storage means; and a command means for commanding the position control loop to specify a positional deviation and a rotational direction based on the stored data.