JPH03150602A - Numerical controller with tool data centralized control function - Google Patents

Abstract

PURPOSE:To simplify the data processing related to tools even at the time of attaching various devices as options by centralizing data related to tools into an NC device to manage these data. CONSTITUTION:Tool numbers, classifications, tool life times, use times, etc., of tools are set and stored in a tool file memory 9, and these data are rewritten and stored on demand, and tool correction values in X, Y, and Z directions of each tool and correction data related to the tool such as the nose radius are stored and held in a tool correction file memory 10. Data of a spare tool used as an alternative tool in the case of the unusable state of a commanded tool on a working program due to tool abnormality or expiration of the life is stored in a spare tool file 31, and data of tool numbers and correction pair numbers is stored there. An operator displays contents of the tool file memory 9 on the screen of a CRT 4 at the time of machine operation or maintenance. Thus, the state of a tool is easily recognized in accordance with tool decision data.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a numerical control device (hereinafter referred to as N
Regarding CRA location and description). More specifically, the present invention relates to an NC device having a tool data centralized management function for processing data related to tools within the NC device.

[Prior art] The tool function of an NC machine tool is called the T function.
In a Canadian program, it is usually commanded by a number (T code) following T. When this T code command is output from the NC device to a programmable controller (hereinafter referred to as PC), the PC causes an automatic tool changer (hereinafter referred to as TC) to execute a tool exchange operation.

Furthermore, the following monitoring/measuring device is known as a function of monitoring/measuring the condition of a tool.

The cutting monitoring device monitors the state during processing.

Cutting monitoring devices differ depending on the target for detecting the machining state. In general, cutting is often monitored by measuring spindle torque, cutting power, etc.To determine tool life, excluding accidents such as breakage,
In many cases, the cutting time is accumulated, and if the tool is used for more than a set time, it is determined that the tool has reached the end of its life, and the tool is replaced with a new one.
The work measuring device measures the machining dimensions of a tool and corrects the tool correction amount when machining the work from the next time. The cutting edge measuring device measures the position of the cutting edge and detects wear and breakage of the tool cutting edge.

Then, when the monitoring/measuring device outputs a signal indicating that each tool is broken, worn, or has reached the end of its life, if a spare tool is registered in advance as a replacement tool for that tool,
There is also known a tool system having a spare tool function that replaces the spare tool with a commanded tool of an NC machining program (hereinafter referred to as program) to continue machining.

[Problem to be solved by the invention] Each of the accessory devices described above is an option for -R.

In many cases, the equipment is attached to the machine tool as necessary, so how to combine and configure each accessory device is determined each time. At this time, the current situation is that the data processing regarding the tools of each device is performed independently, so that overlapping processing is performed. Therefore, when a cutting edge measurement device determines that a tool is abnormal and changes it to a spare tool, a program is processed to notify other cutting monitoring devices and workpiece measurement devices so that the tool data of each device matches. .

Further, depending on the combination of devices, the devices may be configured as a higher-level device and a lower-level device controlled by this device, and the operator needs to create a program in consideration of the parent-child relationship. That is, when each device performs a spare tool function, the program is programmed as follows.

(1) When calling a spare tool with the cutting monitoring device, program the optional block skip and child number in the order of calling the spare tool as shown below, and control the optional block skip according to the calling of the spare tool.

1'l T＞GO× , /2 TXX /9 TXX (2) When using the spare tool call function of the NC device,
The program will be QQT△△. TΔΔ in this case is the tool group. The output child number is the spare tool number registered in the spare tool registration program in the NC device.

Spare tool registration program T △ △ 2 T △ △ 1. T Δ △ 2
, . . . . . . (3) The spare tool calling function in the cutting edge measuring device calls a spare tool using a T code (T#**) in the form of a macro program. The spare tool in this case is set as a common variable in the NC device.

System common variable (spare tool file) 5001:0
1 (Tool number) 5002: 03 5009:10 Program examples have been shown above, but when each device is combined, the program form will be completely different depending on which device performs the spare tool function. , it is necessary to adjust the interface (T/F) between each device, including the program format.

In addition, since each device has the determination data for each tool independently, it takes time to check the history of tools that have been determined to be abnormal or have reached the end of their tool life. In particular, spare tools are used when the commanded tool number, that is, the tool commanded by the program, cannot be used due to tool life, etc., but the relationship between the commanded tool number actually used and the executed tool number is determined by the tool data processing. Because it was not centralized, it became confusing and unclear.

[Problems to be Solved by the Invention] This invention solves the problems described in 1. It was invented based on the above technical background, and it achieves the following objectives.

The purpose of this invention is to centrally manage data related to the tools of each accessory device so that the program is the same regardless of the presence or absence of options, and has a centralized tool data management function that is easy for operators to operate and maintain. The purpose of the present invention is to provide a numerical control device.

Another object of the present invention is to make each accessory device work 1lfi.
It is an object of the present invention to provide a numerical control device that is easy to connect to a C device and has a tool data centralized management function that simplifies tool data processing.

[Means for Solving the Problems] In order to solve the problems described above, the present invention takes the following measures.

This means is a numerically controlled machine tool having a plurality of tools for performing 11M machining and a monitoring/measuring device that directly or indirectly monitors and measures the state of the tools during and after machining. Tool file memory for storing tool number, life time setting data, cumulative cutting time data, and tool judgment data.

a tool data management means for rewriting tool determination data in the tool file memory when a tool abnormality signal is output from the monitoring/measuring device; and a tool data management means for accumulating the cutting time of the tool and storing cumulative cutting time data in the tool file memory. a tool life management means for rewriting the tool judgment data of the tool file memory, determining that the tool has reached the end of the tool life when the accumulated cutting time data exceeds the tool life setting time data, and rewriting the tool judgment data of the tool file memory; a spare tool file memory that registers and holds the tool number of a spare tool to be used as a substitute tool when a tool malfunctions or reaches the end of tool life, and a spare tool registered in the spare tool file memory as a substitute tool for the said tool. a spare tool management means for selectively calling the above tools; and a display means for displaying the contents of the tool file memory and the spare tool file memory.

This numerical control device includes a central processing unit that centrally controls each of the means, and has a tool data centralized management function that allows data related to the plurality of tools to be centrally displayed and operated.

The monitoring/measuring device includes a cutting monitoring device that monitors the machining load during machining of the tool, a cutting edge measuring device that detects the position of the cutting edge of the tool, and a workpiece measuring device that measures the dimensions of the workpiece machined with the tool. It is even more effective to configure it with a device.

[Function] Each accessory device connected to the NC device outputs only tool state judgment data to the NC device, and data related to the tool is output to the NC device.
The C device performs centralized management. This minimizes input/output regarding tool data between each accessory device, further simplifying tool data management.

[Embodiment] FIG. 1 is a functional block diagram showing an outline of a numerical control device 30 having a function of centrally managing data of an N/C lathe tool with ATC. A CPU (central processing unit) 1 is connected to input/output devices, memory, etc. via a bus 2. CR
T4. A keyboard 5 is connected via an interface 3.

The CRT 11 is a display device used for checking and editing a Canadian program. The keyboard 5 is an input device for this purpose. The system program memory 6 stores an OS program for operating the entire numerical control device.

The machine program memory 7 stores a machine program including tool paths for machining tools, machining conditions, and the like. The tool file management program memory 8 writes and changes data to a tool file memory 9 (described later) based on data from one cutting monitoring device, a cutting edge measuring device 23, a workpiece measuring device 26, etc., which will be described later, and also detects tool abnormalities. , a program is stored for calling a spare tool registered in the spare tool file 31 as a substitute tool for a tool whose tool life has expired.

The tool file memory 9 is a memory for setting and storing the tool number 1 type, tool life time setting, usage time, etc. of the tool, and rewriting and storing the data as necessary.

The tool compensation file memory 10 stores x, y, z for each tool.
This is a memory for storing tool-related correction data such as direction tool correction values and nose radius. A correction set number is attached to the correction data, and each time a tool is selected, the correction set number is also selected, and the position of the tool cutting edge is offset by 1 using the correction data corresponding to that tool, and machining is performed.

The spare tool file 31 is a memory that stores the data of a spare tool to be used as a substitute tool when the commanded tool on the machine program becomes unusable due to a tool error or the end of the tool life. In the file 31, data of a tool number and a correction set number are stored. To know the contents of each memory 9, 10.31, use the keyboard 5.
C: Display on RT4 screen.

Operators should use CR and T during machine operation and maintenance.
By displaying the contents of the tool file memory 9 on the screen 4, the state of the tool can be easily grasped from the tool determination data. The turret tool post is powered by an X servo motor 15. Z
The drive is controlled by a servo motor 16. ATC17 is CPL! 1 via interface 13
4, performs the necessary tool change cycle operations. The cutting monitoring device 17 is a monitoring device that detects the input current of the main shaft motor 21 of the NCR board through a detection port N 20 and monitors this input current.

Set the setting values for each tool in this device,
If the input value exceeds this set value, a signal is output to the NC device via the interface 18 as a tool abnormality (load abnormality). This setting value is stored in the tool load setting file memory 12 in the cutting monitoring device 19. These set values and input values are constantly compared during processing. The cutting edge measuring device 23 measures tool wear and the like.

To measure the position of the cutting edge, the tool T is driven by a servo motor and brought into contact with the contactor 24 set at a predetermined position from each direction, and the position of the cutting edge is measured based on the contact signal.

The workpiece measuring device 26 is a measuring device based on the same principle as the cutting edge measuring device 23, and detects the machining dimension of the workpiece W by detecting the position where the touch sensor 27 contacts the workpiece W.

When the blade edge position changes in the blade edge measuring device 23 2
When the cumulative value of the amount of change in the position of the cutting edge exceeds a set value as the amount of change due to tool wear, a tool abnormality signal is output to the NC device 30.

In the workpiece measuring device 26, when the workpiece size changes by more than a predetermined amount, and when the cumulative value of the workpiece size change exceeds a set value, a tool abnormality signal is output to the NC device 30. The tool life management program memory 32 accumulates the usage time of each tool, rewrites the usage time in the tool file memory 9 as needed, and compares the usage time with the tool life setting time to determine if the usage time exceeds the set time. The cutting monitoring device 19, the cutting edge measuring device 23, and the workpiece measuring device 26, which store a program for rewriting the tool judgment data in the tool file memory 9, are all known devices. The details will not be explained here.

[Operation] FIG. 2 is a flowchart showing an example of the operation of the NC device shown in FIG. 1.

A T code (Tttxx) is commanded from the Canadian program (step PL). In this T code, tt indicates a tool number, and xx indicates a correction set number. It is determined whether or not a tool abnormality is output from the cutting edge measuring device 23 to this commanded tool (P).

). If no abnormal signal is output, step P3
Proceed to tool file memory 9 if it has been output.
Change the tool judgment data of 1 to the cutting edge needle ING (P8).

In step P3, it is determined whether or not a tool abnormality signal is output from the workpiece measuring device 26. If the abnormality signal is not output, the process proceeds to step P4, and if it is output, the tool judgment data is Rewrite the work total as ING (Pg). In step P4, it is determined whether a load abnormality signal is output from the cutting monitoring device 19 or not. If the abnormal signal is not output, proceed to step P; if the abnormal signal is output, proceed to step P.
Tool judgment data can be written to load abnormality (P + o).

In step P5, it is determined whether the tool life management program memory 32 is outputting a tool life signal. If it is not output, proceed to step P6 and send a command to PCl4 to execute the T code command.9 If it is output, rewrite the tool judgment data to tool life. Step P8 ~ pH where tool judgment data is rewritten by alarm signals from each device
Then, the process proceeds to step P12, where it is determined whether or not a spare tool is registered. If no spare tools are registered, an alarm will be generated and the machine will be stopped (Pia)
.

If a spare tool is registered, it is determined whether the tool determination data for this tool has been rewritten as tool abnormality or tool life (PI3). If it has been rewritten, the process returns to step P12 and it is determined whether any other spare tools are registered.

For drilling that has not been rewritten, the spare tool number is read from the spare tool file memory 31 (PI4>, 6 steps P6. Step Tsub) sends a command to PCl4 to execute a T code command with the tool number of the spare tool. After executing the T code command in P15, the process proceeds to step P7, where it is determined whether the control device is in the RE A D Y state (operating state), and the R
When in the E A DY state, it returns to the beginning and waits for the next T code command. If it is not a READYJR calendar, the process is terminated (PI7) 6 [Effects of the Invention] As detailed above, this invention has the advantage that data related to tools is centrally managed within the NC device, Even if it is attached as an option, data processing related to tools becomes easier. Furthermore, the Canadian program can also be made common. Each accessory device only needs to output tool judgment data to the NC device, which simplifies tool-related data processing, so the device should focus on monitoring and measuring functions, which are the original purpose of each accessory device. be able to.

The operator can check the tool status on the screen, making it easier to understand the tool status and making operation and maintenance easier.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram of the comprehensive tool calling device, and FIG. 2 is a flow diagram showing an example of the operation of the comprehensive tool calling device. 1... CPU <central processing unit) 8... Tool file management, 9... Tool file memory, 10... Correction file memory, 12... Tool load setting file, 1
7... Cutting monitoring device, 23... Blade edge measuring device, 26
...Workpiece measuring device

Claims (1)

[Claims] 1. A numerically controlled machine tool that has a plurality of tools for performing machining and a monitoring/measuring device that directly or indirectly monitors and measures the state of the tools during and after machining. a tool file memory for storing tool numbers, life time setting data, cumulative cutting time data, and tool judgment data of the plurality of tools; and when a tool abnormality signal is output from the monitoring/measuring device, a tool data management means for rewriting tool judgment data in a tool file memory; and accumulating cutting time of the tool and rewriting the cumulative cutting time data in the tool file memory, the cumulative cutting time data being used as the tool life setting time data. a tool life management means that determines that the tool life has expired when the tool exceeds the tool life, and rewrites the tool determination data in the tool file memory; a spare tool file memory for registering and holding tool numbers of spare tools; a spare tool management means for selectively calling a spare tool registered in the spare tool file memory as a substitute tool for the tool; the tool file memory; Tool data comprising a display means for displaying the contents of a spare tool file memory, and a central processing unit for centrally controlling each of the means, and capable of centrally displaying settings and operating data regarding the plurality of tools. Numerical control device with centralized management function. 2. In claim 1, the monitoring/measuring device includes a cutting monitoring device that monitors the machining load during machining of the tool, a cutting edge measuring device that detects the position of the cutting edge of the tool, and a cutting edge measuring device that monitors the machining load during machining of the tool, and a cutting edge measuring device that detects the position of the cutting edge of the tool. A numerical control device having a tool data centralized management function, comprising a workpiece measuring device for measuring dimensions.