JPH08243869A - Numerical control device - Google Patents

Abstract

PURPOSE: To perform work of changing a tool without each time presetting a tool change work form by a worker, by providing a tool information read means of reading tool information from the tool, in the case of judging holding the tool in a tool change position. CONSTITUTION: A DNC device 130 of inputting a tool information read write signal, when a discriminated change mode is discriminated 'insert', reads tool information of a tool T from its ID chip by an ID tag 1.25. When completed a read process of the tool information, a read completion signal is outputted to an NC device 120, and tool information of the tool T read at present is down loaded to a magazine number of tool control information of the NC device 120. A process of updating the magazine information in this DNC device 130 is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerical control device for a machine tool having a tool magazine.

[0002]

2. Description of the Related Art In a machine tool such as a machining center, a plurality of tools for machining a workpiece are held in a tool magazine of the machine tool and machining is performed while automatically exchanging the tools. However, when performing many types of machining, the tools in the tool magazine may not be enough.In such a case, the operator should remove unnecessary tools in the tool magazine and attach the necessary tools. I have to. Further, in an FMS or the like having a plurality of machining centers, the management of the tools held in the tool magazine of each machining center is managed by the DNC device which controls the NC device of each machining center. It has become.

The tool changing work by the worker in the above case will be described with reference to the drawings. FIG. 15 is an overall configuration diagram showing a conventional machining center system. 10 is a machining center, and a column 13 can be moved on a bed 12 fixed to a floor surface or an appropriate mounting surface in a Z-axis direction (left-right direction in FIG. 15) and an X-axis direction (direction perpendicular to the paper surface in FIG. 15). It is provided in. A main shaft 14 that detachably supports the tool T and that rotates is provided on the column 13 so as to be movable in the Y-axis direction (vertical direction in FIG. 15). Then, the bed 1 is moved by the tool T attached to the spindle 14.
The work W supported by the table 19 on the upper part 2 is processed.

A tool magazine 16 is attached to the side surface of the frame 11 surrounding the column 13, and a plurality of tools T are provided.
Are stored in the pot P. Reference numeral 15 denotes a tool changer, which is designed to change the tool T indexed at the first tool change position 16a of the tool magazine 16 and the tool T attached to the spindle 14 by the change arm 15a. Also,
The tool T which is unnecessary for the next processing in the tool magazine 16 and the tool T required for the next processing are replaced by the second tool behind the tool magazine 16.
The operation is performed at the tool exchange position 16b, and the operation is performed by the operator directly inserting or removing the tool T into or from the pot P indexed to the second tool exchange position 16b. By the way, the tool T is attached with an ID chip C capable of writing the tool information (tool management number, correction value, tool life, etc.) of the tool T, as shown in FIG. Position 16
Tool information can be read and written by the ID tag 25 provided in b.

Further, as shown in FIG. 3, the machining center 10 and the table 1 are provided around the machining center 10.
A cover 40 that covers the entire 9 is provided. The cover 40 has a second tool replacement position 16b of the tool magazine 16
A door 41 that can be opened and closed is provided at a position facing
An operator manually opens and closes when changing tools. The door 41 has an open / close sensor 42 for detecting the open / closed state.
An electromagnetic lock 43 for restricting the opening of the door 41 is provided, and detection of the open / closed state of the door 41 by the opening / closing sensor 42 and restriction of the opening of the door 41 by the electromagnetic lock 43 are performed by the programmable controller 23 described later. It has become. Further, a lamp 44 is attached to the cover 40 to inform the operator that the tool change may be started.

In FIG. 15, reference numeral 20 denotes an NC device having a programmable controller (hereinafter referred to as PC) 23 built-in, and based on a command signal from the PC 23, a machining operation of the machining center 10, a tool changing operation, an indexing operation of the tool magazine 16, etc. To control. Further, the NC device 20 manages the tool information of each of the tools T stored in the tool magazine 16 as tool management information, and stores the tool information (for example, tool life) that changes due to machining moment by moment. . As shown in FIG. 4, this tool management information stores a magazine number and tool information in association with each other.

An operation panel 21 is provided on the PC 23, and a start switch 21a for starting the indexing of a magazine.
And a magazine number setting switch 21b for setting a magazine number to be indexed, and a mode changeover switch 21c for switching between three modes of tool change (three modes of "withdrawal", "insertion", and "replacement") described later. Each information is output to the NC device 20 as a command signal. Further, the electromagnetic lock 4 for detecting the open / closed state of the door 41 by the open / close sensor 42 and restricting the opening of the door 41.
The PC 23 also performs the operation 3 and the lighting of the lamp 44.

Reference numeral 30 denotes a DNC device, which is connected to the NC devices 20 of a plurality of machining centers 10 to centrally control the entire system of the machining center 10 and to manage the tools T held in the tool magazine 16 of each machining center 10. It is stored as information. This magazine information refers to the tool magazine 16 as shown in FIG.
The number of the pot P in which the tool T is held is stored in association with the magazine number and the tool identification number.

Further, the DNC device 30 obtains the tool T required for the next machining according to the information of the workpiece from the production control device (not shown), and compares it with the tool T currently held in the tool magazine 16. A replacement tool list is created and printed from a printer (not shown). As shown in FIG. 18, this replacement tool list is an old tool number which is the tool management number of the tool T currently held in the tool magazine 16 and a new tool which is the tool management number of the tool T required for the next machining. Is a list corresponding to the magazine numbers, and the worker performs the tool replacement work according to the replacement tool list.

Further, the DNC device 30 delivers the tool information managed in the NC device 20 in response to a request signal from the NC device 20 (a magazine number reading signal, a tool information writing signal, etc. described later), and The ID tag 25 is used to read and write tool information from the tool T. With the above configuration, the conventional flow of tool exchange will be described in detail with reference to the flowchart of FIG. There are three types of work styles of the tool exchange performed by the operator: “withdrawal”, “insert”, and “exchange”. “Pulling out” is a work of pulling out a tool T that is inserted into the pot P in the tool magazine 16 and is unnecessary for the next processing. The “insertion” is an operation of inserting a tool required for the next processing into an empty pot P in which the tool T of the tool magazine 16 is not inserted. The “replacement” is a work of inserting a tool T required for the next processing after extracting a tool unnecessary for the next processing in the tool magazine 16. Therefore, the DNC device 30 operates to read and write the following tool information according to the above-mentioned three work modes.

Now, it is assumed that the machining W has completed the machining of the workpiece W as the final product of the lot, and the DNC device 30 has printed the replacement tool list (see FIG. 6) necessary for the next machining. First, the operation of extracting the tool T1 unnecessary for the next processing in the tool magazine 16 will be described. From the list of replacement tools (see Fig. 18), the operator selects T as the old tool.
Since there is no new tool in 1 for magazine number 1,
It is determined that the tool T1 needs to be removed.

At step 51, the operator inputs the magazine number (1 in this case) from the magazine number setting switch 21b of the operation panel 21, and at step 52, the exchange mode is set to "disengage" by the mode changeover switch 21c. . When the operator presses the start switch 21a in step 53, the PC 23 outputs the magazine number (1 in this case) and the magazine indexing signal input in step 51 to the NC device 20. Then, the NC device 20 which has received the magazine indexing signal outputs a magazine number reading signal (request command) to the DNC device 30 and at the same time outputs the pot P of magazine number 1 to the tool magazine 16 of the machining center 10 to the second position. Index to the tool change position 16b. The DNC device 30 that has input the magazine number reading command is NC
The magazine number (1 in this case) and the exchange mode (“pull” in this case) from which the device 20 is to be extracted are read from the NC device 20.

The DNC device 30 discriminates "disconnect" from the read exchange mode, moves to step 55, and uploads the tool information of the tool T1 from the NC device 20. After the indexing of the tool magazine 16 is completed, the NC device 2
The DNC device 30 which has input a signal indicating that the magazine indexing is completed from 0 writes the tool information uploaded from the NC device 20 into the ID chip C of the tool T1 from the ID tag 25. When this writing is completed, the DNC device 30 outputs a write completion signal to the NC device 20. The NC device 20 which has input the write completion signal notifies the operator via the PC 23 that the tool change may be started by the lamp 44.
And the door 41 provided on the cover 40
The electromagnetic lock 43 of is released.

In step 57, the operator opens the door 41, removes the tool T1 indexed to the second tool changing position 16b, and closes the door 41. Then, the PC 23 receives the signal from the open / close sensor 42 that detects that the door 41 is closed.
Outputs a work completion signal indicating that the work has been completed to the DNC device 30 via the NC device 20. Then, the DNC device 30 that has input the work completion signal rewrites the tool identification number of the magazine number 1 in the magazine information (see FIG. 17) (in the case of “without”, deletes the tool identification number). This completes the tool extraction work.

Next, an empty pot P in the tool magazine 16
The operation of inserting the tool T12 required for the next processing will be described. From the list of replacement tools (see Figure 18), the operator
Since there is no old tool and the new tool is T12, it is determined that the tool T1 needs to be inserted in the magazine number 2. In step 51, the operator inputs the magazine number (2 in this case) from the magazine number setting switch 21b of the operation panel 21, and in step 52 the mode changeover switch 2
The exchange mode is set to "insert" from 1c.

In step 53, when the operator presses the start switch 21a, the PC 23 causes the NC device 20 to execute step 5
The magazine number (2 in this case) input in 1 and the magazine indexing signal are output. Then, the NC device 20 becomes DN
A magazine number read signal (request command) is output to the C device 30, and the pot P of magazine number 2 is indexed to the tool magazine 16 of the machining center 10 at the second tool exchange position 16b. The DNC device 30 which has received the magazine number reading signal reads from the NC device 20 the magazine number (2 in this case) to be inserted into the NC device 20 and the exchange mode (“insert” in this case).

At step 54, the exchange mode is "insert".
Therefore, the process proceeds to step 59, but when the indexing of the magazine is completed during this period, the NC device 20 turns on the lamp 44 via the PC 23 and releases the electromagnetic lock 43 of the door 41. In step 59, the operator opens the door 41, inserts the prepared tool T12 into the pot P of the magazine number 2 indexed to the second tool exchange position 16b, and closes the door 41. Then, the PC 23 outputs a work completion signal to the DNC device 30 via the NC device 20 in response to a signal from the opening / closing sensor 42 that detects that the door 41 is closed. The DNC device 30 to which the work completion signal is input is
From the read exchange mode, "insert" is determined, and the process proceeds to step 60, where the tool information of the ID chip C of the tool T12 is read by the ID tag 25. When the reading of the tool information is completed, the tool number of the magazine number 2 of the magazine information (see FIG. 17) in the DNC device 30 is rewritten, and then the process moves to step 61 to download the tool information of this tool 12 to the NC device 20. To do. The NC device 20 rewrites the downloaded tool information into the tool management information (see FIG. 4) corresponding to the magazine number (2 in this case). When the rewriting of this tool management information is completed, the NC device 20 will move to the PC 2
The electromagnetic lock of the door 41 is operated 43 via the
Is locked and the lamp 44 is turned off. This completes the insertion work.

Finally, the operation for exchanging the tool T3 unnecessary for the next processing and the tool T13 necessary for the next processing in the tool magazine 16 will be described. According to the replacement tool list (see FIG. 18), the operator has the tool T3 and the tool T for the magazine number 3 because the old tool is T3 and the new tool is T13.
It is judged that the replacement of 13 is necessary. In step 51, the operator inputs the magazine number (3 in this case) from the magazine number setting switch 21b of the operation panel 21, and in step 52, the exchange mode is changed from the mode changeover switch 21c to "exchange".
Set to.

In step 53, when the operator presses the start switch 21a, the PC 23 causes the NC device 20 to execute step 5
The magazine number (3 in this case) input to 1 and the magazine indexing signal are output. Then, the NC device 20 becomes DN
A magazine number read signal (request command) is output to the C device 30, and the pot P of magazine number 3 is indexed to the second tool exchange position 16b. The DNC device 30 that has received the magazine number read signal reads the magazine number (3 in this case) and the exchange mode (“replacement” in this case) with which the NC device 20 is to be exchanged.

The DNC device 30 determines "replacement" from the read replacement mode and moves to step 55 to upload the tool information of the tool T3 from the NC device 20. The DNC which has completed the magazine indexing of the tool magazine 16 and has input the magazine indexing completion signal from the NC unit 20.
The device 30 writes the tool information uploaded from the NC device 20 into the ID chip C of the tool T3 from the ID tag 25. When this writing is completed, the DNC device 30 outputs a write completion signal to the NC device 20. The NC device 20 which has received the signal indicating the completion of writing turns on the lamp 44 via the PC 23, and the electromagnetic lock 4 on the door 41.
Release 3.

In steps 57 to 59, the operator opens the door 41, extracts the tool T3 indexed to the second tool exchange position 16b, and then inserts the tool T13 prepared in advance into the tool T3. Insert into the pot P (magazine number 3 in this case) and close the door 41. Then, the PC 23 outputs a work completion signal to the DNC device 30 via the NC device 20 by the output signal of the opening / closing sensor 42. The DNC device 30 that has input the work completion signal determines whether to execute the tool information reading process based on the read exchange mode (exchange in this case), and in step 60, sets the tool information of the ID chip C of the tool T13 to ID. Read with tag 25. When the reading of the tool information is completed, the DNC device 3
The tool number of the magazine number 3 in the magazine information in 0 (see FIG. 17) is rewritten to T13, and then the process moves to step 61 to download the tool information of the tool 13 read by the NC device 20 to the NC device 20. The NC device 20 rewrites the downloaded tool information into the tool management information (see FIG. 4) corresponding to the magazine number (3 in this case). When the rewriting of the tool management information is completed, the NC device 20 operates the electromagnetic lock 43 of the door 41 via the PC 23 and turns off the lamp 44. This completes the replacement work.

In the above description of operation, download means data transfer from the DNC device 30 to the NC device 20, and upload means data transfer from the NC device 20 to the DNC device.
Data transfer to device 30 is shown.

[0023]

As described above, in the work of exchanging tools for the tool magazine 16 by the operator, depending on the work mode of the tool exchange (the exchange mode of "pull", "insert", "exchange"). Since the tool information read / write processing by the ID tag is different, at what timing should the tool information be read / written? Numerical control device (NC device 20 and DNC device 30 in the above-described related art)
Need to teach. Particularly, as in the above-mentioned conventional technique, the NC device 20 manages the tool information of the tool T in the tool magazine 16, and the DN device 30 manages this tool information.
In a machining center system that reads and writes to,
Before writing the tool information to the tool T, the tool information is written to the NC device 2
Since the process of uploading from 0 and, conversely, reading the tool information and then downloading the tool information to the NC device 20 is required, the DNC device 30 needs to recognize the work form of the tool exchange. Therefore, when the above-mentioned conventional DNC device 30 inputs the magazine number reading signal from the NC device 20, it reads the magazine number and the exchange mode in which the tool T is exchanged, and the tool information by the ID tag 25 is read according to the exchange mode. It is reading and writing. For this reason, the operator needs to set the exchange mode (“disconnect”, “insert”, “exchange”) with the mode changeover switch 21C each time before performing the tool exchange work, which makes the work complicated. There was a problem. In addition, if the worker forgets to set the exchange mode or makes a mistake in setting it, an abnormal interruption will occur each time and the workability will be poor.

Therefore, it is an object of the present invention to provide a tool which allows a worker to perform a tool exchanging work without setting a working mode of the tool exchanging each time in the tool exchanging work by the worker to the tool magazine. A numerical control device for a machine tool having a magazine is provided.

[0025]

Means for Solving the Problems The means of the present invention for solving the above-mentioned problems is a numerical controller for a machine tool having a tool magazine for storing a plurality of tools. When the tool stored in the magazine is removed, the tool information changed by processing is written in the ID chip provided in the tool, while it is stored in the ID chip of the tool when the tool is inserted in the tool magazine. In a numerical control device for reading the stored tool information, first discriminating means for discriminating whether or not the tool is held at the tool exchanging position of the tool magazine before the exchanging work of the tool, and the first discriminating means. A tool information writing means for writing the tool information corresponding to the tool in the ID chip when it is determined by the means that the tool is held at the tool exchange position. Second discriminating means for discriminating whether or not the tool is held at the tool exchanging position of the tool magazine after the tool exchanging work, and the tool is kept at the tool exchanging position by the second discriminating means. And tool information reading means for reading the tool information from the tool when it is determined that the tool information is read.

The means of the present invention according to claim 2 is an individual control device for controlling a machine tool having a tool magazine for storing a plurality of tools, and a central control for integrally controlling the plurality of individual control devices. And a tool for exchanging tool information of the tool in the tool magazine managed by the individual control device between the individual control device and the central control device. When the tool is uploaded, the tool information uploaded from the individual control device is written in the ID chip of the tool by the central controller, while the tool is inserted by the central controller when the tool is inserted into the tool magazine. Said I
In a numerical control device of a machine tool that downloads the tool information read from a D chip to the individual control device, a magazine information management unit that stores the presence or absence of a tool in the tool magazine, and a tool replacement position from the magazine information management unit. And a discriminating means for discriminating whether or not the tool is present, and when the discriminating means discriminates that the tool is present at the tool exchange position, the tool information is uploaded from the individual control device, and this upload is performed. Tool information writing means for writing tool information in the ID chip of the tool, and the ID of the tool after the tool is inserted when the determining means determines that the tool is not present at the tool exchange position. Tool information for reading the tool information from the chip and downloading the read tool information to the individual control device. And reading means composed of the provision in the central controller.

[0027]

When the pot corresponding to the magazine number is indexed to the tool exchange position, the tool is held in the pot indexed to the tool exchange position by the first discriminating means. Is determined. Then, when the tool is held in the pot indexed to the tool replacement position based on the result of the first determining means, the tool information writing means writes the tool information in the ID chip of the tool.

When the tool changing work is completed, the second judging means judges whether or not the tool is held in the pot at the tool changing position. Then, when the tool is held in the pot at the tool exchange position based on the result of the second discriminating means, the tool information stored in the tool ID is read by the tool information reading means. Therefore, when extracting a tool unnecessary for the next processing in the tool magazine, the tool is extracted after the tool information managed by the numerical controller is written. On the other hand, when inserting a tool required for the next processing into an empty pot in the tool magazine, the tool information stored in the tool after the tool is inserted is read out and stored in the numerical controller. Furthermore, when exchanging an unnecessary tool in the tool magazine for a tool required for the next machining, after the tool information managed by the numerical controller is written to the tool unnecessary for the next machining, After the tool is taken out and the tool required for the next machining is inserted, the tool information stored in this tool is read out and stored in the numerical controller.

Further, in the operation of the invention of claim 2, the presence or absence of the tool at the tool exchange position of the tool magazine is determined by the determining means. When it is determined that the tool is present at the tool exchange position, the central control unit determines that the tool is to be removed and uploads the tool information from the individual control unit by the tool information writing means, and the uploaded tool information is centrally controlled. Write from the device to the ID chip of the tool. On the other hand, when it is determined that there is no tool at the tool exchange position, the central control unit determines that the tool is inserted and reads the tool information from the ID chip of the tool after the tool is inserted by the tool information reading means, The read tool information is downloaded to the individual control device. When the tool is changed, the central control unit is designed to continuously perform the above-mentioned two processes.

[0030]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram showing a machining center system which is an embodiment of the present invention. A machining center 100 is capable of moving a column 113 in a Z-axis direction (left-right direction in FIG. 1) and an X-axis direction (direction perpendicular to the paper surface in FIG. 1) on a bed 112 fixed to a floor surface or an appropriate mounting surface. It is provided in. In addition, the tool T is installed in the column 113.
A main shaft 114 that removably supports and rotates is provided so as to be movable in the Y-axis direction (vertical direction in FIG. 1). And
The bed 11 is attached by the tool T attached to the spindle 114.
The work W supported by the table 119 on the upper part 2 is processed.

A tool magazine 116 is attached to the side surface of the frame 111 surrounding the column 113, and a plurality of tools T are stored in the pot P. Reference numeral 115 denotes a tool changer, which is a first tool change position 1 of the tool magazine 116.
The tool T indexed to 16a and the tool T attached to the spindle 114 are exchanged by an exchange arm 115a. Further, the exchange of the tool T unnecessary for the next machining and the tool T required for the next machining in the tool magazine 116 is performed at the second tool exchange position 116b behind the tool magazine 116, and the second tool exchange position 116b. The operation is performed by the operator directly inserting or removing the tool T into or from the pot P indexed to. Further, the second tool change position 116b has a second
A proximity switch 118 (second determining means) for determining whether or not the tool T is held in the pot P indexed to the tool exchange position 116b is provided, and this detection signal is input to the PC 123 described later. It is supposed to be done. By the way, the tool T has the same structure as that of the above-described conventional art.
As shown in, the tool information of the tool T (tool management number,
An ID chip C capable of writing correction values, tool life, etc.) is attached, and tool information can be read and written by the ID tag 125 provided at the second tool replacement position 116b.

Further, as in the prior art, as shown in FIG. 3, the outer periphery of the machining center 100 is surrounded by the machining center 10.
0 and a cover 40 that covers the entire table 119 are provided. The cover 40 is provided with a door 41 that can be opened / closed at a position facing the second tool exchange position 116b of the tool magazine 116, and is manually opened / closed by an operator when the tool is exchanged. The door 41 is provided with an open / close sensor 42 for detecting the open / closed state and an electromagnetic lock 43 for restricting the opening of the door 41. The open / close sensor 42 detects the open / closed state of the door 41 and the electromagnetic lock 43 opens / closes the door 41. The regulation is performed by the PC 123 described later. Further, a lamp 44 is attached to the cover 40 to inform the operator that the tool change may be started.

Reference numeral 120 denotes an NC device (individual control device) having a programmable controller (hereinafter referred to as PC) 123 built therein, and based on a command signal from the PC 123, a machining operation of the machining center 100, a tool changing operation, and an indexing operation of the tool magazine 16. Etc. are controlled. Further, the NC device 120 manages the tool information of each of the tools T stored in the tool magazine 116 as tool management information, and the tool information (for example, tool life) that changes due to machining is stored moment by moment. . As shown in FIG. 4, this tool management information stores a magazine number and tool information in association with each other. The PC 123 responds to signals from various sensors (for example, the proximity switch 118, the open / close sensor 42, etc.) provided in the machining center 100, and N in response to a command from an operator through the operation panel 122 described later.
A command signal is sent to the C device 120, and the machining center 10
The start timing of each operation of 0 is commanded. The PC 123 is provided with an operation panel 121, and a start switch 121a for starting the indexing of a magazine.
And a magazine number setting switch 121b for setting a magazine number to be indexed.
It is designed to output to 0 as a command signal. Further, the PC 123 has a door 41 by the opening / closing sensor 42 described above.
It also detects the open / closed state, operates the electromagnetic lock 43 that regulates the opening of the door 41, and lights the lamp 44.

Reference numeral 130 denotes a DNC device (central control device), which is connected to the NC devices 120 of a plurality of machining centers 100 to centrally control the entire system of the machining center 100, and which is held in the tool magazine 116 of each machining center 100. The management of T is managed as magazine information. As shown in FIG. 5, the magazine information includes an entry flag for identifying whether the tool T is held in the pot P of the tool magazine 116 and a tool management number stored in the pot P as a magazine number. Correspondingly stored. The entry flag is set to "*" when the tool T is normally inserted by the operator's tool exchanging operation described later, and conversely, the entry flag is reset when the tool T is normally extracted. The presence or absence of the tool T in the pot P can be identified by the presence or absence of "*" (first discriminating means or discriminating means). However, the entry flag is not limited to "*" as long as the presence or absence of the tool T can be determined. Further, although detailed description is omitted, this magazine information (entry flag and tool identification number) is also updated when the tool exchanging device 115 exchanges tools between the tool magazine 116 and the spindle 114.

Further, the DNC device 130 determines the tool T required for the next machining according to the information of the workpiece W from the production control device (not shown) and compares it with the tool T currently held in the tool magazine 116. The tool T that needs to be inserted, the tool T that needs to be removed, and the tool T that needs to be replaced
Is determined and stored as replacement tool information together with the work form. In addition, this replacement tool information is printed as a replacement tool list shown in FIG. 6 from a printer (not shown), and the worker performs the tool replacement work according to the replacement tool list.

Further, the DNC device 130 is the NC device 12
The tool information managed in the NC device 120 is passed according to a request signal from 0 (a magazine number reading signal described later), and the tool tag T is transferred by the ID tag 125.
It is designed to read and write tool information. next,
The operation of tool exchange in the machining center system having the above-mentioned configuration will be described with reference to the flowcharts of FIGS. FIG. 7 is a flow chart showing the procedure of the operator in the tool change, and FIGS. 8 and 9 are the NC device 1.
20 is a flowchart showing the operation of FIG.
3 is a flowchart showing the operation of the DNC device 130.

Now, it is assumed that the machining center 100 has completed the processing of the workpiece W as the final product of the lot, and the DNC device 130 has printed the replacement tool list (see FIG. 6) necessary for the next processing. First, the operation (“pulling”) of removing the tool T1 unnecessary for the next processing in the tool magazine 16 will be described.

In step 201 of FIG. 7, the operator sets the magazine number (1 in this case) of the pot P holding the tool T1 on the operation panel 121 based on the pre-printed replacement tool list (see FIG. 6). It is input from the magazine number setting switch 121b. Subsequently, in step 202, the operator presses the start switch 121a to start indexing of the magazine and waits until the lamp 44 notifying that the tool can be changed is turned on.

At step 201, the start switch 121a
When is pressed, the NC device 120 executes step 301 and subsequent steps in FIG. That is, the PC 123 outputs the magazine number (1 in this case) input from the operation panel 121 in step 201 and the magazine indexing signal to the NC device 20. Then, the NC device 120, which has received the magazine indexing signal in step 302, outputs a magazine number reading signal (request command) to the DNC device 130 and, in step 303, issues a magazine to the tool magazine 116 of the machining center 100. Number 1 pot P
To the second tool change position 116b. Then, in step 304, the process waits until the exchange mode is input from the DNC device 130.

Signal for reading the magazine number (request command)
The DNC device 130 that has input is the step 401 in FIG.
Do the following. The DNC device 130 that has received the magazine number reading signal in step 401 operates in step 402.
The magazine number (1 in this case) to be extracted from the NC device 120 is read at. Then, the process proceeds to step 403, and the record (entry flag and tool identification number) of the read magazine number (1 in this case) is read from the magazine information (see FIG. 5) managed in the DNC device 130. In step 404, it is determined whether the tool P is held in the indexed pot P by referring to whether the entry flag is "*" or not, and the exchange mode is determined. That is, when the entry flag is “*” (when the entry flag is set), it indicates that the tool T is held in the pot P, and therefore the tool replacement process is either extraction or replacement. Since it is necessary to pull out the tool without fail, the exchange mode is determined to be "pull out". On the other hand, when the entry flag is not “*” (when the entry flag is reset), it means that the tool P is not held in the pot P, and therefore the tool replacement process is insertion and the replacement mode is “insert”. Is determined. Then, when the exchange mode is determined to be “without”, the process proceeds to step 406, and when it is determined to be “insert”, step 405.
Move to In this case, since the tool T1 is held in the magazine number 1 and the entry flag is "*", it is determined to be "without" or "replacement" and the process proceeds to step 406.

At step 406, the DNC device 130 uploads the tool information of the magazine number 1 among the tool information managed in the NC device 120, and at step 407, the NC device 120 "extracts". Is notified (the exchange mode signal is output). Then, in step 408, the DNC device 130 waits until a tool information read / write signal (in this case, a tool information write signal) is input from the NC device 120.

When the NC device 120 inputs the exchange mode signal (in this case, "disconnect") from the DNC device 130, it proceeds to step 305 in FIG. DNC in step 305
Since the exchange mode notified from the device 130 is "without", the process proceeds to step 306. In step 306, when the NC device 120 inputs an indexing completion signal indicating the completion of magazine indexing from the PC 123, the DNC device 130.
A tool information read / write signal (in this case, a tool information write signal) for starting the writing of tool information is output to. Then, in step 307, the NC device 120 outputs a write completion signal indicating that the writing process of the tool information to the ID chip C by the ID tag 125 is completed, to the DNC device 130.
Wait until input from.

The DNC device 130, which has received the tool information read / write signal, moves to step 409 in FIG. 10 and moves to step 416 in FIG. 12 because the exchange mode determined in step 404 is “without”. When the process proceeds to step 416, the DNC device 130 uploads the magazine number 1 uploaded from the NC device 120 in step 404 of FIG.
The tool information of the tool T1 corresponding to is written in the ID chip C of the tool T1 by the ID tag 125. When the writing process of the tool information is completed, the DNC device 130 outputs a writing completion signal to the NC device 120 in step 417, which indicates that the writing process of the tool information is completed. Then, in step 418, the magazine information (see FIG. 5) in the DNC device 130 is updated. That is, magazine number 1
The entry flag of is reset ("*" is deleted) and the tool identification number is deleted. However, since it is possible to determine that the tool T is held only in the pot P whose entry flag is "*", it is not always necessary to delete the tool identification number. This completes the tool information writing process of the DNC device 130.

NC device 120 to which a write completion signal has been input
Recognizes that the writing process of the tool information by the DNC device 130 is completed, and moves to step 308 of FIG.
The electromagnetic lock 43 of the door 41 is released via C123 and the lamp 44 is turned on to enable the worker to extract the tool T1. Then, the NC device 120 waits until the operator opens the door 41, removes the tool T1, and tightens the door 41 again (steps 309 and 310).

When the lamp 44 is turned on, the worker is in the tool T1.
Recognizing that it has become possible to remove the
The door 41 is opened in step 4, the tool is replaced (in this case, the tool T1 is removed) in step 205, and the door 4 is opened in step 206.
Close 1 When the tool replacement process is correctly performed according to the replacement tool list, the worker's work is completed.

When the opening / closing sensor 42 detects that the door 41 has been closed, the NC unit 120 operates in step 311 of FIG.
At the same time, the electromagnetic lock 43 is activated and the lamp 44 is turned off. Next, in step 312, the tool magazine 11
Proximity 118 provided at No. 6 second tool change position 116b
It is determined whether or not the tool T is held in the pot P by. If the tool T is in the pot P, step 31
3, while if there is no tool T, step 31
Move to 8. In this case, assuming that the work of extracting the tool T1 by the operator is correctly performed, the tool T is placed in the pot P.
Since there is no such information, the process proceeds to step 318, and step 30
In step 4, the exchange mode input from the DNC device 130 is "disconnect", so that the process proceeds to step 319 and the abnormality determination process 2 is executed. On the other hand, when the operator accidentally forgets to pull out the tool T1 or inserts another tool T, the tool T is put in the pot P.
Is present, the process proceeds to step 313. Since the exchange mode is “without”, the abnormality determination processing 1 of step 314 is executed.

When the process proceeds to the abnormality determination processing 2 in step 319, whether the extraction work has been normally performed, or the operator forgets to insert the tool T to be replaced by the "replacement" of the tool replacement described later. Is judged. That is, when the abnormality determination processing 2 is executed, the NC device 120 notifies the DNC device 130 that there is no tool T in the pot P, and the presence / absence state of this tool T and the DNC device 130.
By comparing with the working form of the replacement tool information (see FIG. 6) stored therein, it is possible to determine whether or not the tool replacement by the operator has been correctly performed. DNC device 13
At 0, the abnormality determination processing 2 shown in FIG. 14 is executed, and if the work mode (“pulling” in this case) of the corresponding magazine number (1 in this case) is “pulling out”, the NC device 12 indicates no abnormality.
0 is notified and the subsequent steps of the NC device 120 are continued. On the other hand, if the work mode is “insert” or “replacement”, the NC device 120 is notified of the abnormality and the abnormality is interrupted.
In this case, since the work mode is “pulling”, the DNC device 130 notifies the NC device 120 that there is no abnormality, and the pulling work of the tool T1 is completed.

On the contrary, when the process proceeds to the abnormality determination processing 1 in step 314, it is determined whether the "replacement" of the tool described later is normally performed or the tool T is not properly extracted. Is done. That is, when the abnormality determination processing 1 is executed, the NC device 120 changes the DN device 1 to
Notify 30 that there is a tool T in the pot P,
By comparing the presence / absence state of the tool T with the work form of the exchange tool information (see FIG. 6) stored in the DNC device 130, it is possible to determine whether or not the tool exchange by the operator is correctly performed. There is. The DNC device 130 is shown in FIG.
If the operation mode (in this case, "without") of the corresponding magazine number (in this case, 1) is "replacement", the NC device 120 is notified of no abnormality and the NC device 120 is notified. If the work mode is "disconnect" or "insert", the error is NC.
The device 120 is notified and abnormal suspension is performed. In this case, since the work form is not required, the DNC device 130 notifies the NC device 120 of the abnormality and suspends the abnormality.

Next, the operation (“insert”) of inserting the tool T12 required for the next processing into the empty pot P of magazine number 2 will be described. It should be noted that the description of the steps overlapping with the above-described work of extracting the tool T1 will be omitted. Similar to the above-described extraction work, the worker presses the start switch 121a after setting the magazine number 2 based on the replacement tool list, and waits until the lamp 44 is turned on (steps 201 to 203 in FIG. 7).

When the start switch 121a is pressed, the NC device 120 outputs a magazine number read signal to the DNC device 130 and at the same time, the pot P of the magazine number 2 of the tool magazine 116 is indexed to the second tool exchange position 116b and the DNC is set. It waits until the exchange mode is input from the device 130 (steps 301 to 304 in FIG. 8). DNC device 1 that has input a magazine number read signal (request command)
30 executes step 401 and subsequent steps in FIG. 10 to read the record of magazine number 2 in the magazine information (FIG. 5).
At step 404, the state of the entry flag is determined. In this case, since the tool T is not held in the pot P of magazine number 2 and the entry flag is reset, the exchange mode is determined to be "insert" and step 4 is executed.
Move to 05.

Upon proceeding to step 405, the DNC device 130 is in the exchange mode “insert” with respect to the NC device 120.
Is notified (the exchange mode signal is output).
Then, in step 408, the DNC device 130
It waits until a tool information read / write signal (in this case, a tool information read signal) is input from the device 120. When the NC device 120 receives the exchange mode signal (“insert” in this case) from the DNC device 130, the process proceeds to step 305 in FIG. 8. In step 305, since the exchange mode notified from the DNC device 130 is “insert”, the process proceeds to step 308.

When the process proceeds to step 308 and the indexing completion signal indicating the completion of the indexing of the magazine is input from the PC 123, the NC device 120 releases the electromagnetic lock 43 of the door 41 and turns on the lamp 44, and the tool T12 of the operator.
It waits until the insertion work is completed and the door 41 is closed (steps 308 to 310 in FIG. 8). When the lamp 44 is turned on, the operator opens the door 41, inserts the previously prepared tool T12 into the pot P of magazine number 2 indexed to the second tool exchange position 116b, and closes the door 41 (step in FIG. 7). 204-206). With the above, the work of the worker is completed.

The NC device 120, which has detected that the door 41 is closed by the opening / closing sensor 42, operates in step 311 of FIG.
At the same time, the electromagnetic lock 43 is activated and the lamp 44 is turned off. Next, at step 312, it is determined whether or not the tool T is present in the pot P indexed to the second tool exchange position by the proximity switch 118 provided at the second tool exchange position 116b. In this case, the tool T
If the insertion of 12 is normally performed, the tool T12 is present in the pot P, and the process proceeds to step 313.
At step 313, since the exchange mode notified from the DNC device 130 at step 304 is “insert”, the process proceeds to step 316. On the other hand, the operator mistakenly uses the tool T
If you continue to work without inserting 12, step 3
At 12, it is determined that there is no tool T in the pot P, the process proceeds to step 318, and the replacement mode is "insert", so that the operation is abnormally interrupted. Upon moving to step 316, the NC device 12
0 outputs a tool information read / write signal (in this case, a tool information read signal) that causes the DNC device 130 to start reading tool information. Then, in step 317, NC
The device 120 waits until a read / write completion signal (in this case, a read completion signal) indicating that the process of reading the tool information by the DNC device 130 is completed is input from the DNC device 130.

The DNC device 130 to which the tool information read / write signal has been input shifts to step 409 in FIG. 10 and shifts to step 411 in FIG. 11 because the exchange mode determined in step 404 is “insert”. Upon proceeding to step 411, the DNC device 130 reads the tool information of the tool T12 from the ID chip C of the tool T12 using the ID tag 125. When the reading process of the tool information is completed, a read completion signal is output to the NC device in step 412, and the tool information of the tool T12 currently read in step 413 is downloaded to the magazine number 2 of the tool management information of the NC device 120. Then, in step 414, the magazine information (see FIG. 5) in the DNC device 130 is updated. That is, the entry flag of magazine number 2 is set (“*” is set) and the tool identification number is updated to T12. This completes the tool information reading process of the DNC device 130. The NC device 120 is the DNC device 1.
When the read completion signal is input from 30, it is recognized that the read processing of the tool information is completed, and the insertion processing of all the tools T12 is completed.

Finally, a replacement work ("replacement") in which the tool T3 is removed from the pot P of magazine number 3 and the tool T13 necessary for the next processing is inserted will be described. This tool T
The exchanging work of is carried out by combining the above-mentioned tool T extracting work and tool T extracting work. In addition, in the explanation, the above-mentioned work of extracting the tool T1 and the tool T1
The description of the steps which are the same as those of the inserting operation of 2 will be omitted.

The operator presses the start switch 121a after setting the magazine number 3 based on the replacement tool list,
Wait until the lamp 44 lights up (step 2 in FIG. 7).
01-203). When the start switch 121a is pressed, N
The C device 120 outputs a magazine number read signal to the DNC device 130, indexes the pot P of the magazine number 3 of the tool magazine 116 to the second tool exchange position 116b, and until the exchange mode is input from the DNC device 130. It stands by (steps 301 to 304 in FIG. 8).

The DNC device 130 which has received the magazine number read signal (request command) executes step 401 and the subsequent steps in FIG. 10 to read the record of magazine number 3 in the magazine information (FIG. 5). In step 404, the exchange mode is discriminated from the state of the entry flag. In this case, since the tool T3 is held in the magazine number 3 and the entry flag is set ("*"), the exchange mode is determined to be "without" and the process proceeds to step 406.

At step 406, the DNC device 130 uploads the tool information of the magazine number 3 (tool T3) among the tool information managed in the NC device 120, and at step 407, the NC device 120. Notify the user of "disengagement" (output the exchange mode signal). Then, in step 408, the DNC device 130 waits until a tool information write signal is input from the NC device 120.

When the NC device 120 inputs the exchange mode signal (in this case, "disconnect") from the DNC device 130, it proceeds to step 305 in FIG. DNC in step 305
Since the exchange mode notified from the device 130 is "without", the process proceeds to step 306. In step 306, when the NC device 120 inputs an indexing completion signal indicating the completion of magazine indexing from the PC 123, the DNC device 130.
A tool information writing signal is output to step 307
Then, it waits until the write completion signal is input from the DNC device 130.

Since the exchange mode of the DNC device 130 to which the tool information read / write signal (in this case, the tool information write signal) has been input is "disconnect", the process proceeds to step 416 in FIG. 12, and the uploaded tool information of magazine number 3 is used as the tool. T
Write to ID chip C of 3. Then, in step 417, a write completion signal is output to the NC device 120, and in step 418, magazine information (see FIG. 5) update processing in the DNC device 130 is performed. That is, the entry flag of magazine number 3 is reset ("*" is erased)
And delete the tool identification number.

NC device 120 to which a write completion signal has been input
Releases the electromagnetic lock 43 of the door 41 and the lamp 44
Is lit, and waits until the worker 41 completes the tool exchange work and closes the door 41 (steps 308 to 31 in FIG. 8).
0). When the lamp 44 lights up, the operator opens the door 41,
The tool T3 held in the pot P indexed to the second tool exchange position 116b is pulled out, and then the previously prepared tool T13 is inserted into this pot P and the door 41 is closed (step 204 in FIG. 7). ~ 206). With the above, the work of the worker is completed.

When the opening / closing sensor 42 detects that the door 41 has been closed, the NC device 120 determines the step 311 in FIG.
At the same time, the electromagnetic lock 43 is activated and the lamp 44 is turned off. Next, at step 312, it is determined whether or not the tool T is held in the pot P by the proximity switch 118 provided at the second tool exchange position 116b. In this case, if the operator has properly replaced the tool T3 and the tool T13, the tool T13 is present in the pot P, and the process proceeds to step 313. In step 313, since the exchange mode notified from the DNC device 130 in step 304 is "disconnect", the process proceeds to step 314. On the other hand, if the worker mistakenly inserts the tool T13 and then continues the work without removing the tool T3, it is determined that there is no tool T in the pot P, and the process proceeds to step 318.

The tool change work is correctly performed, and step 31
When the process shifts to 4, the above-described abnormality determination processing 1 is executed to determine whether the tool replacement has been normally performed. That is, the DNC device 130, which has been notified by the NC device 120 that the tool T13 is in the pot P, refers to the work form of the tool management information (see FIG. 6) in step 450 of FIG. In this case, since the work mode of magazine number 3 is "replacement", it is determined that the tool replacement work has been correctly performed.
Notify 20. The NC device 120, which has received the notification from the DNC device 130 that the tool T replacement work has been correctly performed, moves to step 315. On the other hand, if the tool change operation is not correctly performed and the process proceeds to step 319, the above-mentioned abnormality determination processing 2 is executed and the tool T is not properly changed, or the above-mentioned tool T removal operation is correctly performed. Is determined. That is, the DNC device 130 notified from the NC device 120 that there is no tool T13 in the pot P refers to the work form of the tool management information (see FIG. 6) in step 460 of FIG. In this case, since the work mode of magazine number 3 is “replacement”, the NC device 120 is notified that the tool replacement work has not been correctly performed, and the operation is abnormally interrupted.

When the process proceeds to step 315, the NC device 12
0 outputs a magazine number read signal to the DNC device 130 as in step 302. Then, in step 316, a tool read signal is output to the DNC device 130, and in step 317, the read completion signal is output to the DNC device 1.
Wait until input from 30. The DNC device 130 to which the magazine read signal is input executes step 301 and subsequent steps in FIG. 8 in the same manner as described above. NC at step 402
The magazine number is read from the device 120. However, NC
The magazine number is read as 3 because the magazine number is not set again in the device 120. Step 40
In 3, the magazine number 3 record (entry flag and tool identification number) of the magazine information is read. In this case, since the entry flag has been reset by the removal of the tool T3, the exchange mode is determined to be "insert" when the process proceeds to step 404, and the exchange mode of the NC device 120 is "insert" in step 405. Notify that. However, in this case, the N
The C device 120 does not perform any processing.

In step 408, the DNC device 130 sets the N
A tool information write signal is input from the C device 120, the exchange mode is determined to be "insert" in step 409, and the process proceeds to step 411 in FIG. When proceeding to step 411, the DNC device 130 reads the tool information of the tool T13 from the ID chip C of the tool T13 inserted in the second tool replacement position 116b by the ID tag 125. When the reading process of the tool information is completed, a read completion signal is output to the NC device in step 412, and the tool information of the tool T13 currently read in step 413 is downloaded to the magazine number 2 of the tool management information of the NC device 120. Then, in step 414, the magazine information (see FIG. 5) in the DNC device 130 is updated. That is, the entry flag of magazine number 3 is set (“*” is set) and the tool identification number T13 is written. This completes the tool information reading process of the DNC device 130.

When the NC device 120 inputs the read completion signal from the DNC device 130, it recognizes that the process of reading the tool information is completed, and completes the replacement process of all the tools T13. In the above description of operation, download means data transfer from the DNC device 30 to the NC device 20, and upload means data transfer from the NC device 20 to the DNC device 30.
Data transfer to.

Although detailed description is omitted, the DNC device 130 uses the tool identification number of the tool information read from the tool T by the ID tag 125 after step 411 and the replacement tool stored in the DNC device 130. The information is collated with the tool identification number, and if the tool identification number is different, the NC device 120 is notified of the abnormality and the abnormality is interrupted.

As described above, in the machining center system of the present embodiment, whether the exchange mode is "disconnect" or "insert" is automatically determined from the state of the entry flag of the magazine information managed by the DNC device 130. Further, the proximity switch 118 detects the presence or absence of the tool T after the tool replacement work by the operator is completed, and thereby it is determined whether the tool replacement mode is "disconnect" or "replacement". Therefore, the worker can read and write the tool information by the DNC device 130 without setting the replacement mode each time the tool is replaced. Therefore, the worker sets the tool T to the second tool replacement position 116b based on the replacement tool list printed by the DNC device 130.
The tool T can be replaced by simply setting (withdrawing, inserting, and replacing) the tool T to improve workability. Moreover, in the present embodiment, the automatically discriminated exchange mode and the DNC device 1 are used.
Since the abnormality is determined by collating with the exchange tool information managed by 30, the wrong tool exchange work is prevented even if the operator mistakenly exchanges the tool T. .

In the above-mentioned embodiment, the first discriminating means of claim 1 and the claim 2 in the scope of claims.
The discriminating means of is constituted by the step 404 of FIG. 10 for discriminating the presence or absence of the entry flag (“*”) of the magazine information managed in the DNC controller 130, and the second discriminating means of claim 1 is It is assumed that the proximity switch 118 is used.

Further, in this embodiment, the DNC device 130
Determines whether the tool T is held in the pot P of the specified magazine number, the exchange mode is "without" or "insert" depending on whether the entry flag of the magazine information is "*" or not. However, the presence / absence of the tool T detected by the proximity switch 118 may be sent to the DNC device 130, and the exchange mode may be determined depending on the presence / absence of the tool T. However, in this case, since the DNC device 130 cannot determine the exchange mode until the pot P of the designated magazine number is indexed to the second tool exchange position 116b, the subsequent processing (for example,
There is a drawback that processing such as uploading tool information is delayed.

Finally, it should be noted that the present embodiment can be carried out also in a machining center in which an automatic tool changing device is provided at the second tool changing position 116b of the tool magazine 116.

[0072]

As described above, the numerical control device of the present invention determines whether or not the tool is held at the tool exchange position of the tool magazine before the tool exchange work, and further, Since the tool replacement mode is automatically determined by determining whether or not the tool is held at this tool replacement position after the tool replacement work is performed, the worker is required to perform tool replacement work each time. It is possible to read and write the tool information according to the work form of the tool exchange without setting the exchange mode. As a result, workability is improved and mistakes in tool replacement work caused by forgetting to set the replacement mode are eliminated.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a machining center system that is an embodiment of the present invention.

FIG. 2 is a view showing an ID chip C provided on a tool.

FIG. 3 is a configuration diagram showing a cover of a machining center.

FIG. 4 is a diagram showing tool management information.

FIG. 5 is a diagram showing magazine information.

FIG. 6 is a diagram showing a replacement tool list.

FIG. 7 is a flowchart showing a procedure of an operator in tool exchange.

FIG. 8 is a flowchart showing an operation of the NC device.

FIG. 9 is a flowchart showing the operation of the NC device.

FIG. 10 is a flowchart showing the operation of the DNC device.

FIG. 11 is a flowchart showing the operation of the DNC device.

FIG. 12 is a flowchart showing the operation of the DNC device.

FIG. 13 is a flowchart showing an abnormality determination process 1 of the DNC device.

FIG. 14 is a flowchart showing an abnormality determination process 2 of the DNC device.

FIG. 15 is an overall configuration diagram showing a conventional machining center system.

FIG. 16 is a flowchart showing a conventional tool changing operation.

FIG. 17 is a diagram showing conventional magazine information.

FIG. 18 is a diagram showing a conventional replacement tool list.

[Explanation of symbols]

 100 Machining Center 116 Tool Magazine 116b Second Tool Exchange Position 118 Proximity Switch 120 NC Device (Individual Control Device) 122 Operation Panel 123 Programmable Controller 125 ID Tag 130 DNC Device (Central Control Device) C ID Chip P Pot T Tool

Front Page Continuation (72) Inventor Yoshihiro Nagami 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. (72) Inventor Tatsuya Yamamoto 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. (72) Invention Koichi Sugiura 1 Toyota-cho, Toyota-shi, Aichi Toyota Motor Co., Ltd.

Claims (2)

[Claims] 1. A numerical control device for a machine tool having a tool magazine for storing a plurality of tools, wherein when the tool stored in the tool magazine is extracted, tool information changed by machining is stored in the tool. In a numerical control device that writes in the provided ID chip, while reading the tool information stored in the ID chip of the tool when the tool is inserted into the tool magazine, before the tool replacement work is performed, First discriminating means for discriminating whether or not the tool is held at the tool exchange position of the tool magazine,
When the first discriminating unit discriminates that the tool is held at the tool exchanging position, the tool information writing unit for writing the tool information corresponding to the tool in the ID chip and the tool exchanging work are performed. And a second discriminating means for discriminating whether or not the tool is held at the tool exchange position of the tool magazine, and the second discriminating means judges that the tool is held at the tool exchange position. And a tool information reading means for reading the tool information from the tool in this case. 2. An individual control device for controlling a machine tool having a tool magazine for storing a plurality of tools, and a central control device for integrally controlling the plurality of individual control devices. The tool information of the tool in the tool magazine managed by the individual control device is exchanged with the central control device, and uploaded from the individual control device when the tool is extracted from the tool magazine. The tool information read from the ID chip of the tool by the central controller when the tool is inserted into the tool magazine by the central controller. In a numerical controller of a machine tool that downloads data to the individual control device, a magazine that stores the presence or absence of tools in the tool magazine An information management unit, a determination unit that determines whether the tool is present at the tool exchange position from the magazine information management unit, and the determination unit determines that the tool is present at the tool exchange position by the determination unit. When the tool information writing means for uploading the tool information from the individual control device and writing the uploaded tool information in the ID chip of the tool, and the determining means determines that there is no tool at the tool exchange position. The central control unit is provided with a tool information reading means for reading the tool information from the ID chip of the tool after the tool is inserted and downloading the read tool information to the individual control unit. Numerical control device characterized by.