JP2654800B2 - Control data self-holding drive unit - Google Patents

Description

The present invention relates to a control data self-holding type drive unit. More specifically, the present invention relates to a control data self-holding drive unit in which control parameters of a feed shaft or a spindle drive device are stored in a storage means, the storage means is provided in the drive unit, and control information is also unitized.

[Prior Art] A machining center has a table and a feed drive unit in a column so as to be movable in three axis directions, that is, in X, Y and Z axis directions. If necessary for this machining center, the B axis is further added in order to add the number of machining axes.
For example, an index table is provided on the table. On the other hand, a machine tool such as a transfer machine is assembled by assembling modularized parts such as a driving part, a head part, and a body part of the machine as necessary.

[Problem to be Solved by the Invention] The added additional shaft is not usually removed and used for another machining center. Even if it can be used for other machine tools, the backlash correction data and the like are ignored. Similarly, modular machine tools are not typically performed on numerically controlled machine tools. Even if it is implemented, it is at the design stage, and it is not possible to easily add or replace the feed shaft at the factory site. To do this, the parameters of the drive motor and the feed axis must be reset from the beginning. Therefore, it is not possible to easily replace or add a drive unit at a factory site. The present invention solves these problems and achieves the following objects.

SUMMARY OF THE INVENTION An object of the present invention is to provide a control data self-holding drive unit that can be used for any machine tool.

It is another object of the present invention to provide a control data self-holding drive unit in which drive unit information is held in a storage device and unitized.

[Means for Solving the Problems] The present invention employs the following means to solve the problems.

In a drive unit of a numerical control device detachably mounted on a machine tool main body having a built-in drive motor applied to a feed mechanism or a spindle mechanism of a machine tool, the feed unit attached to the drive unit and parameters unique to the drive motor are stored and held. And a system parameter memory for reading and storing the parameters of the parameter memory, and a program for moving the contents stored in the parameter memory in the drive unit to the system parameter memory. And a system memory for performing the control data self-holding.

It is preferable to provide an interface for transmitting the information in the parameter memory to the numerical controller by serial transmission.

[Operation] When the drive unit is installed in the machine tool main body, the parameters unique to the feed shaft and drive motor are read from the parameter memory in the drive unit, and stored in the system parameter memory in the numerical controller of the machine tool main body. The drive unit is controlled in accordance with the system parameters.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a functional block diagram of an NC device having a control data self-holding type drive unit when the present invention is applied to a machining center. The CPU 1 is a central processing unit of an NC (numerical control) device. CPU1 has bus 2
Are connected. The X-axis servo motor 3 drives the table in the X-axis direction. X axis servo motor 3
Are controlled by the CPU 1 via the amplifier 4 and the interface 5. The rotation speed of the X-axis servo motor 3 is always fed back.

The Y-axis servo motor 6 is a drive motor that moves a column in the Y-axis direction. The Y-axis servo motor 6 is controlled by the CPU 1 via the amplifier 7 and the interface 8. The rotation speed of the Y-axis servo motor 6 is always fed back. The rotation speed of the Z-axis servo motor 9
10. It is managed and controlled by the CPU 1 via the interface 11. The rotation speed of the Z-axis servo motor 9 is always fed back by the tachometer.

In this embodiment, the drive unit 12 is an indexing table that is mounted on a table and holds and indexes a workpiece. The indexing table is rotated and driven by the B-axis drive motor 13 to be indexed. The B-axis drive motor 13 is mechanically separated from the amplifier 14 and the interface 15. Both are electrically connected by a wire or the like. Parameter memory 16
Is an IC card or tag type memory. B-axis data is stored in the parameter memory 16.

In this embodiment, axis control-related parameters, feed speed-related parameters, acceleration / deceleration control-related parameters, servo-related parameters, pitch error correction parameters, and motor constant-related parameters are stored and held. The axis control-related parameters indicate a label such as the name of the axis, for example, the axis is the B axis. Feed speed related parameters are
Feed speed parameters such as cutting feed and rapid feed. The acceleration / deceleration control-related parameters store and hold the start-up, deceleration, and stoppage speeds of the B-axis servomotor.

The pitch error correction parameter is data for electrically correcting a pitch error peculiar to the index gear or a pitch error of the feed screw. Since this pitch error varies depending on the processed gear and feed screw, the pitch error is measured and input in advance. The motor constant-related parameter is a parameter that restricts a current from flowing beyond a rated motor. On the other hand, when the capacity of the amplifier is small, it is for restricting the amplifier from flowing excessively.

The above data is stored and held in the memory 16. The data stored in the parameter memory 16 is transmitted to the interface 18 on the machine main body side via the interface 17.
Is electrically connected to the The interface 17 and the interface 18 have means for coding for serial transmission and means for restoring the data to the original data. That is, in the manner normally used in communication technology,
This is a method of encoding and sending data. This method is advantageous for reliably sending a large amount of data.

The parameter memory 16 and the interface 17 are mounted in the B-axis servomotor 13 or in the indexing device of the drive unit 12 with a space provided. The terminal 19 with a CRT is a terminal device that is generally used for displaying and inputting and outputting data and programs. The system memory 20 is a ROM memory for storing control software for controlling the present system. The system parameter memory 21 stores the parameters of the parameter memory 16 described above.

In this example, the RAM is configured, but other rewritable means such as an EPROM may be used. Machining program memory 22
Is a memory for storing a machining program incorporating the trajectories of the X, Y, Z, and B axes.

Operation The flow chart shown in FIG. 2 is an operation when data is read from the parameter memory 16 of the control data self-holding type drive unit described in FIG. CPU1 first step
It determines whether or not the power ON flag is set at P _1. Power ON
If the flag is YES, this flow ends, and the process proceeds to a normal numerical control device machining process. If the flag is standing in Step P _1, moves to step P _2. Additional axis in step P _2, that is, in the embodiment determines whether there are additional B-axis driving unit. Exit If NO in step P _2, the process proceeds to step P ₃ if YES.

In step P _3, reads the B-axis data from the parameter memory 16. In step P _4, and writes the B-axis data to the system parameter memory 21. In Step P _5, it is determined whether the writing of data is completed. When you are finished, to set the flag of the power ON at step P _6. When these steps are completed, ordinary numerical control processing is performed.

Another Embodiment The amplifier 14 of the B-axis drive motor 13 is provided separately from the drive unit 12. The amplifier 14 may be integrated with the drive unit 12. In this case, an amplifier having the optimum capacity for the B-axis drive motor 13 can be used. The output of the parameter memory 16 is performed by the interface 17 and the interface 18 as serial signals. However, if the transmission path can be shortened,
It may be accessed by CPU1.

In the above embodiment, the B axis is added. However, the machining center, the transfer machine X,
The same technical idea as described above can be applied to a rotary drive unit such as a feed shaft such as Y and Z and a spindle drive unit. The technical philosophy of unit-type machine tools is well known for the mechanical configuration of modular transfer machines, etc.
It is not disclosed here.

[Effects of the Invention] As described in detail above, the drive unit of the present invention integrates parameters specific to the drive motor, feed shaft, and gears in the drive unit into a memory, so that the parameters can be applied to any machine tool. A drive unit can be added or replaced without considering it.

[Brief description of the drawings]

FIG. 1 is a control data self-holding type driving unit, and FIG. 2 is an operation flow diagram for reading data from a parameter memory to a numerical controller. 1 ... CPU, 3 ... X-axis servo motor, 6 ... Y-axis servo motor, 9 ... Z-axis servo motor

Claims (2)

(57) [Claims] 1. A drive unit of a numerical control device detachably mounted on a machine tool main body having a built-in drive motor applied to a feed mechanism or a spindle mechanism of a machine tool, wherein the drive mechanism is attached to the drive unit and is unique to the drive mechanism. A parameter memory for storing and holding the parameters, and a system parameter memory of the numerical control device for reading and storing the parameters of the parameter memory;
And a system memory for storing a program for moving a storage content of the parameter memory in the drive unit to a system parameter memory. 2. The control data self-holding drive unit according to claim 1, wherein said drive unit has an interface for transmitting information of said parameter memory to said numerical controller by serial transmission.