JPH06190690A - Numerical control device provided with tool life control function - Google Patents

Abstract

PURPOSE:To remove bad effect on the cut face of a workpiece to be generated in a numerical control device provided with a tool life control function by immediately performing tool exchange when the used tool reaches the tool life time during cutting of the workpiece. CONSTITUTION:A working program command is read, before execution of the program, a non-cutting condition is detected by means of a non-cutting condition detecting part 3, and at being in the non-cutting condition, a tool life time is checked by means of a program changeover control part 4, and if a using tool 8b reaches the life, tool exchange is completed by a tool exchange subprogram, and the working program interrupted is reopened. Further, detection of the non-cutting condition is performed based on the command from the working program or the signal of a contact sensor to detect contact between a workpiece and a tool.

Description

Detailed Description of the Invention

[0001]

[Industrial application] By checking the tool life time,
The present invention relates to a numerical control device having a tool life management function for automatically changing tools.

[0002]

2. Description of the Related Art In a conventional numerical controller having a tool life management function, a plurality of types of tools are previously mounted in a tool magazine of a machine tool, and a plurality of the same type of tools are attached to each tool magazine. Check the tool life time at the time of selection command and automatically select the available tool from the tool magazine above, or suspend the machining operation immediately when the tool in use reaches the set tool life time. Then, the interruption position is stored, and a previously stored tool exchange subprogram is called and executed to exchange it with another tool of the same type.

FIG. 5 is a block diagram showing an example of a conventional numerical control device having a tool life management function. In FIG. 5, an input unit 1 is an input unit for inputting a program command such as a tool selection command and is stored. The section 2 is a storage section (hereinafter referred to as a tool command number storage section) 2a that stores the tool command number input through the input section 1 and a storage section (hereinafter, tool magazine) that stores the tool magazine numbers of usable tools. Number storage section) 2b, a storage section (hereinafter referred to as a tool remaining life 0 position storage section) 2c that stores the position when the tool remaining life time of the tool in use becomes 0, and then executes Storage unit that stores the block number (hereinafter referred to as the next block number storage unit)
2d and a storage unit (hereinafter referred to as a tool exchange subprogram storage unit) 2e for storing a tool exchange subprogram.

The tool management data setting unit 10 is a tool management data setting unit in which the management data of the tool command number corresponding to the tool magazine number and the tool remaining life data for counting the tool life time are set and registered. The tool magazine number output unit 7 is a tool magazine number storage unit 2b of the storage unit 2 described above.
In the tool magazine number output unit that outputs the tool magazine number stored in, the calculation unit 6 newly selects from the calculation unit that selects the usable tool magazine number, the tool correction number management data, and the tool correction amount management data content. The calculation unit determines the selected tool correction number or the tool correction amount.
The control unit 5 is a control unit that controls input, storage, calculation, and output operations. The machine tool 8 includes a tool selection unit 8a for selecting a tool and a tool 8b selected by the tool selection unit 8a.

Next, the operation will be described with reference to FIG.
When the operator sets the tool command number and the tool life time corresponding to the tool magazine number using the panel keyboard or the like, the tool management data setting unit 10 displays the management data TD1 of the tool command number corresponding to the tool magazine number and the tool life time. The remaining tool life data TD2 to be counted is registered. When the tool selection command TS (T code command by the machining program) is input from the input unit 1, the control unit 5 stores the tool command number TSa specified by the tool selection command TS from the input unit 1 in the storage unit 2. Stored in the tool command number storage unit 2a,
Further, through the arithmetic unit 6, it is possible to use the usable tool by using the management data TD1 of the tool command number corresponding to the tool magazine number of the tool management data setting unit 10 and the remaining tool life data TD2 and the content TSa of the tool command number storage unit 2a. The magazine number TMb is determined and stored in the tool magazine number storage unit 2b of the storage unit 2, and the tool magazine number TMb is output to the machine tool 8 via the tool magazine number output unit 7. In parallel with the above control, the calculation unit 6 determines the newly selected tool correction number by using the tool correction number management data, the tool correction amount management data, and the content TMb of the tool magazine number storage unit 2b of the storage unit 2. And tool correction amount TCD
To decide. When the tool correction is executed, the control unit 5 performs a correction suitable for the newly selected tool based on the tool correction amount TCD, and operates with this new correction.

Further, during the above operation, the tool remaining life data TD2 of the tool management data setting unit 10 is always checked, and when the tool remaining life data of the tool in use becomes 0 (when the tool has reached the end of life), immediately. The machining operation in the machine tool 8 is temporarily interrupted through the control unit 5, the interruption position data SDc indicating the position of the tool at the time of interruption, and the block number SDd of the machining program to be executed next are stored in the tool of the storage unit 2. Remaining life 0 position storage unit 2c and next block number storage unit 2
Each is stored in d. Subsequently, by calling and executing the tool exchange subprogram PDe stored in the tool exchange subprogram storage unit 2e of the storage unit 2 in advance, even if the tool selection command TS from the machining program is not input, the When the tool reaches the set tool life time, the machining is immediately stopped and the tool is replaced automatically.

The tool change subprogram PDe performs the following operations. First, the tool that has reached the tool life is returned to the tool replacement position, the tool is replaced with an available tool of the same type, and the tool compensation of a new tool is performed, and the remaining tool life 0 position storage unit 2c of the storage unit 2 is performed. The new tool is returned to the machining interruption position according to the interruption position data SDc stored in the machining interruption block, and the machining interruption block remaining command is calculated using the machining interruption position coordinates, the interruption block end point coordinates and the interpolation mode to calculate the machining interruption block. The machining is restarted up to the end position of, and thereafter the machining block is restored to the next block where the machining program under machining is interrupted according to the block number SDd stored in the next block number storage unit 2d of the storage unit 2.

[0008]

However, in the prior art as described above, when the workpiece is being cut, the workpiece cutting surface at the machining interruption position for tool exchange and the machining restart position after tool exchange is set. There was a problem that a cutter mark was attached. The present invention has been made in view of the above problems, and an object of the present invention is to provide a tool life management function that does not adversely affect the workpiece cutting surface during automatic tool replacement by checking the tool life time. It is to provide a provided numerical control device.

[0009]

According to the present invention, the tool life time set for each tool is generally set as a reference value,
Considering that it is not so urgent that the tool must be changed as soon as the tool life is reached, the command from the machining program or the signal from the contact sensor that detects the contact between the workpiece and the tool is used. Detecting means for detecting the non-cutting state, and when the non-cutting state detected by the detecting means, check the remaining tool life time of the tool in use,
This is achieved by including storage means for storing the tool life time as the operation interruption position when the tool life time has been reached, and program switching control means for switching between the tool replacement subprogram and the machining program.

[0010]

According to the numerical controller having the tool life management function of the present invention, the non-cutting state during the machining operation is detected, and the tool life time of the tool being used in the non-cutting state is checked, If the tool life is reached, the tool is changed during the non-cutting state, so even if the tool in use reaches the tool life time during cutting of the workpiece, the cutting will not be interrupted without interruption. The tool will be changed when it becomes.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an example of a numerical control device having a tool life management function according to the present invention. Components equivalent to those of the prior art are designated by the same reference numerals and their description is omitted. In the non-cutting state detection unit 3, the machining program command data from the input unit 1 or the currently selected tool 8
Using the contact state confirmation signal obtained through the signal input unit 9 from the contact sensor of the contact detection unit 8c that detects whether or not b is in contact with the workpiece, the non-cutting state during operation by the machining program is determined. To detect. In the non-cutting state detected by the non-cutting state detection unit 3, the program switching control unit 4 checks the tool life time of the tool in use and continues the operation according to the machining program command, or the tool replacement subprogram. To execute the tool change subprogram after interrupting the tool change operation.

The storage unit 2 stores a tool command number input through the input unit 1 (hereinafter referred to as a tool command number storage unit) 2a and a storage unit that stores a tool magazine number of a usable tool. (Hereinafter referred to as a tool magazine number storage unit) 2b and a storage unit for storing a tool replacement subprogram (hereinafter referred to as a tool replacement subprogram storage unit) 2
e, a storage unit (hereinafter referred to as a processing interruption block content storage unit) 2f for storing the interruption block content of the machining program interrupted for tool exchange, and a memory for storing the coordinate value interrupted for tool exchange. Part (hereinafter referred to as a machining interruption position storage part) 2g.

Next, the operation will be described with reference to FIG.
When the tool selection command TS (T code command by the machining program) is input from the input unit 1, the tool selection command TS
Thus, a series of tool exchange operations is performed. The series of tool exchange operations when the tool selection command TS from this machining program is input is the same as the operation according to the tool selection command of the prior art, and therefore its explanation is omitted. The non-cutting state detection unit 3 uses 1 of the machining program command from the input unit 1.
Before executing the operation based on the block data PB, check the contents instructed in the block, or check whether the tool being used is in contact with the workpiece,
It is detected whether or not the current state is a state not directly related to the cutting of the machined surface (non-cutting state), and if it is the non-cutting state, the state data STD is sent to the program switching control unit 4. The contact state between the tool and the workpiece is checked based on the contact state confirmation signal CTS obtained from the contact sensor of the contact detection unit 8c through the signal input unit 9.

The program switching control section 4 receives the status data STD indicating that the tool is in the non-cutting state, checks the tool remaining life data TD2 of the tool management data setting section 10,
If the tool remaining life data of the tool being used is 0, the 1-block data PB of the machining program command from the input unit 1 whose execution has been interrupted to detect the non-cutting state is stored in the machining interruption block content storage unit 2f. The current coordinate value is stored as the machining interruption coordinate position SPg in the machining interruption position storage unit 2g, and the tool replacement subprogram PDe stored in the storage unit 2e in advance is called out to the operation memory to perform the tool exchange. By executing the subprogram PDe, the tool is changed from the non-cutting state. After the tool exchange is completed by executing the tool exchange subprogram PDe, the execution is interrupted for the tool exchange, and the interruption block data PB of the machining program stored in the machining interruption block content storage unit 2f is called to the operation memory. By executing it, the operation according to the machining program is restarted.

Next, the operations of the non-cutting state detecting section 3 and the program switching control section 4 will be described with reference to the flowchart of FIG. One block data of the machining program command is read, and before execution of the block, it is checked whether it is a program end command (M02 command or the like) (step S1). If it is a program end command, the process proceeds to step S6. If it is not the program end command, it is checked whether or not there is a tool selection command (T code command by the machining program) (step S2), and if there is a tool selection command, the process proceeds to step S6. Next, a non-cutting operation command (positioning operation command by G00 command, etc.), a non-cutting state specifying command (M code command, etc.) for specifying a predetermined non-cutting area, or the currently selected tool 8b is processed. The contact state confirmation signal obtained through the signal input unit 9 from the contact sensor of the contact detection unit 8c that detects whether or not the object is in contact is checked (step S3,
(S4, S5), the non-cutting state during operation is detected by the machining program. Here, the non-cutting state means that the read one-block data of the machining program command is the non-cutting operation command, the non-cutting state designation command, or the contact state confirmation signal obtained through the signal input unit 9 is off.
Means the case.

When it is determined in steps S3, S4 and S5 that the tool is not in the non-cutting state, the process proceeds to step S6, and when it is determined that the tool is in the non-cutting state, the tool remaining life data of the tool management data setting section 10 is checked (step S6). S7), if the remaining tool life data in use is 0 (the tool in use is the tool life), the processing from step S8 is performed to replace the tool. In step S6, the one block data of the machining program command read through the input unit 1 is directly stored in the operation memory and the operation of the block command is executed. In step S8, in order to interrupt the operation of the tool changing subprogram, the current block command of the machining program for interrupting the operation by the block command and the interrupted coordinate value are stored in the machining interrupted block contents through the control unit 5, respectively. The data is stored in the section 2f and the machining interruption position storage section 2g.

After that, the tool change subprogram stored in advance in the tool change subprogram storage unit 2e is called out to the operation memory and executed (step S9), and the completion of the tool change by executing the tool change subprogram is waited for. (Step S10) When the tool exchange is completed, the interrupted block command is read from the machining interrupted block position storage unit 2f through the control unit 5, the block command is called out to the operation memory and executed, and all the processes are completed. (Step S11). In this way, the machining program 1
Before reading the block data and executing the operation based on the 1 block data, the above non-cutting state detection check and tool remaining life data check are performed, and the tool change operation by the tool change subprogram is interrupted based on the check result. By doing so, even if the tool selection command from the machining program is not input, the tool is automatically replaced in the first non-cutting state after the tool in use reaches the tool life.

Next, the operation of the tool change subprogram will be described with reference to the flowchart of FIG. The operation of the tool exchange subprogram is to first return the tool that has reached the tool life to the tool exchange position (step S12), and perform the tool exchange with an available tool of the same type as that tool (step S1).
3) Perform tool correction of a new tool, and use the data of the machining interruption position storage unit 2g (coordinate position at which machining is interrupted for tool exchange) to return the new tool to the machining restart position, and perform all processing. It ends (step S14).

Further, the position where the tool change subprogram is interrupted during the operation by the machining program is shown in FIG.
This will be supplemented using the example of the machining program. In the machining program example of FIG. 4, XP1 ... XP4, YP1 ... YP
4 is an X-axis and Y-axis command position, G00 is a positioning operation command, G01 is a cutting feed operation command, Fn is a cutting feed speed command, N10 ... N24 is a sequence number, and Tn is a tool selection command. In addition, the tool numbers 1 and 2 are set / registered in advance as tools of the same type, and the tool magazine number 1 is the tool number 1 tool and the tool magazine number 2
It is assumed that the tool with the tool number 2 is set / registered in the No. tool, and the tool with the tool number 1 is first selected by the tool selection command Tn in this example. Also, tool number 1
The tool of No. 2 which is preset / registered as the same type of tool as the No. tool will be explained below as an example on the assumption that the tool life has not reached.

The tool No. 1 is selected by the tool selection command Tn of N10, and the tool No. 1 currently in use is being operated by the tool according to the machining program command or during the cutting by the cutting feed motion command of N21. When the remaining tool life time of the No. tool reaches 0 (the tool life has been reached), the machining with the tool is continued until the operation according to the command of N22 is completed. After the operation by the command of N22 is completed, the command of the block of N23 is read and the non-cutting state is detected (in this example, the non-cutting condition is detected by the G00 command of the block of N23). , The tool number 1 currently being used has a tool life, so the coordinate position (XP
2, YP2) and the block command of N23 are stored.

Before the operation by the block command of N23 is executed, the previously stored tool change subprogram is interrupted, and the tool change subprogram causes the tool number 1 to be used, and the same tool number 2 which can be used. The tool of No. 2 is exchanged, the tool of Tool No. 2 is corrected, and the newly selected tool of Tool No. 2 is stored as the above-mentioned machining interruption position in the operation completion coordinate position (XP2, XP2) of the block of N22. Return to YP2). When the tool exchange by the tool exchange subprogram is completed, the block command of N23 stored as the machining interruption block is read out and executed, and thereafter, the operation by the machining program command from N24 is restarted.

[0022]

As described above, according to the numerical controller having the tool life management function of the present invention, even if the tool in use reaches the tool life time during cutting of the workpiece, the cutting is interrupted. Instead, the tool is replaced when it is in a non-cutting state, so that it is possible to replace the tool without adversely affecting the machined surface.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a numerical control device having a tool life management function of the present invention.

FIG. 2 is a flowchart showing an operation example of a non-cutting state detection method and program switching control by the device of the present invention.

FIG. 3 is a flowchart showing an operation example of a tool change subprogram in the device of the present invention.

FIG. 4 is an example of a machining program for explaining details of program switching control by the device of the present invention.

FIG. 5 is a block diagram showing an example of a conventional numerical control device having a tool life management function.

[Explanation of symbols]

 2f Processing interruption block content storage section 2g Processing interruption position storage section 3 Non-cutting state detection section 4 Program switching control section 8c Contact detection section 9 Signal input section

Claims (4)

[Claims] 1. A tool remaining life time of a tool in use while the machine tool is in operation is checked, and the tool can be used with a tool of the same type as the tool in use, which is attached to a tool magazine of the machine tool in advance. In a numerical control device having a tool life management function for automatically selecting a tool from the tool magazine of the machine tool, a detection means for detecting a non-cutting state, and a non-cutting state detected by the detection means The tool has a storage means for checking the remaining tool life time of the tool in use and storing the position as the operation interruption position when the tool life time has been reached, and a program switching control means for switching between the tool replacement subprogram and the machining program. Numerical control device equipped with a tool life management function. 2. The non-cutting state is detected by the detecting means,
The numerical control device having a tool life management function according to claim 1, wherein the numerical control device is configured to perform the operation based on a non-cutting operation command in a machining program. 3. The non-cutting state is detected by the detecting means,
The numerical control device with a tool life management function according to claim 1, wherein a specific command previously determined as a non-cutting state designating command is added to the machining program and is executed based on the command. 4. The detection of the non-cutting state by the detecting means is
The numerical control device having a tool life management function according to claim 1, wherein the numerical control device is configured to perform the operation based on a signal of a contact sensor provided in the machine tool that detects a contact between a workpiece and a tool.