JP5948154B2 - Machine tool operation control device - Google Patents

Description

  The present invention relates to an operation control device for a machine tool that restricts the operation of the machine when the machine tool is illegally moved, and in particular, an operation that can cope with an erroneous determination of the transfer detection unit. The present invention relates to a control device.

As a mechanism for preventing the machine tool from being transferred illegally, there is a conventional mechanism disclosed in Patent Document 1, for example. In this prior art, when vibration due to movement of the machine or the like is detected, restart of the machine is limited until a predetermined password is input.

Patent Document 2 discloses a technique in which the detection value of a geomagnetic sensor is monitored, and when it is determined that relocation has been performed based on the result, the operation of the machine is limited after a predetermined time has elapsed since the relocation. Yes.

JP 2003-35595 A JP 2009-205545 A

By the way, in an actual processing site, there is a possibility that a mechanism for judging relocation makes a wrong judgment due to a failure or the like. In the prior art of Patent Document 1, when an erroneous determination of the relocation determination mechanism occurs, when the operator turns off the machine and restarts without noticing the erroneous determination, the restart is limited. There is a possibility that the machine cannot be used even though it has not been relocated.

Also in the prior art of Patent Document 2, if the operator continues to use the machine without noticing the misjudgment of the relocation determination mechanism, the operation of the machine is suddenly restricted after a predetermined time has passed, which hinders the machining operation. There is a risk of coming.

  The present invention has been made in view of the above-described conventional situation, and even when the relocation detection is a misjudgment, it is possible to prevent the machining operation from being hindered by suddenly stopping the machine. An object of the present invention is to provide a machine operation control device.

According to the first aspect of the present invention, when a predetermined relocation condition that the machine tool is relocated is satisfied, a relocation detection unit that detects the relocation condition, and that the relocation detection unit satisfies the predetermined relocation condition. A warning generation unit that warns that an abnormality has occurred in the relocation detection unit, and an operation for starting counting of the elapse of a predetermined time by an operator or by a machine after a warning by the warning generation unit. An operation control device for a machine tool, comprising: an operation limiting unit configured to limit the operation of the machine when a predetermined time has elapsed after the start of the operation.

According to a second aspect of the present invention, in the operation control device for a machine tool according to the first aspect, the warning generation unit generates the warning when the power is turned off and then turned on again.

The invention of claim 3 is the operation control device for a machine tool according to claim 2,
The operation restricting unit detects that a predetermined relocation condition is satisfied in a state where the power is turned on, or after the abnormality is detected in the relocation detecting unit, the power is cut off, and after the power is cut off, After the power is turned on again, the operation of the machine tool is performed during the period from the start of the operation for starting the counting of the lapse of the predetermined time by the operator or the machine until the lapse of the predetermined time is satisfied. The operation of the machine tool is restricted after the passage of the predetermined time is satisfied.

According to a fourth aspect of the present invention, in the operation control device for a machine tool according to any one of the first to third aspects,
The warning generation unit determines whether a predetermined relocation condition has been met, or whether the relocation detection unit has detected an abnormality and determines whether the operator has confirmed the warning. A warning confirmation determination unit is further included, and the operation restriction unit restricts the operation of the machine tool when the passage of the predetermined time is satisfied after the warning confirmation determination unit determines that the operator has confirmed the warning. It is characterized by doing.

The invention according to claim 5 is the operation control device for the machine tool according to any one of claims 1 to 3,
The warning generation unit generates the warning when it is detected that a predetermined relocation condition is satisfied or when an abnormality occurs in the relocation detection unit, and the machine manufacturer indicates that the warning has occurred. A warning notification determination unit that determines whether or not the warning has been notified to the operation side, and the operation restriction unit satisfies the passage of the predetermined time after the warning notification determination unit determines that the machine has notified the warning. It is characterized by restricting the operation of the machine tool.

The invention of claim 6 is the operation control device for a machine tool according to any one of claims 1 to 5 ,
The predetermined time is a time required for an operator to prepare a predetermined workpiece for processing or a time required for actual processing.

The invention according to claim 7 is the operation control device for the machine tool according to claim 6 ,
The operation limiting unit stops the passage of the predetermined time during a period in which the operation of the machine is stopped.

According to the operation control device of the first aspect of the present invention, the relocation detection unit detects that a predetermined relocation condition that the machine tool has been relocated is satisfied, or an abnormality occurs in the relocation detection unit. After the warning, the operator or machine started the operation to start counting the passage of the predetermined time , and then the operation of the machine was restricted when the passage of the predetermined time was satisfied. . Therefore, the operator can know in advance that the machine tool has been relocated due to a warning, or that there is a high possibility that a misjudgment has been made due to an abnormality in the detection unit, and that the machine will not operate after a predetermined time. it can. Therefore, even if the relocation detection is an erroneous determination, since the necessary measures can be taken such as consulting with the machine manufacturer before the predetermined time elapses , the machine will not suddenly operate. Can be avoided.

In the invention of claim 2, since the warning is generated when the power is turned off and then turned on again, the operator makes an erroneous determination due to the relocation of the machine tool or the abnormality of the detection unit. It is possible to know more reliably that the possibility has been made and that the machine will not operate when a predetermined limit condition is reached afterwards, and thus can be more reliably prepared by shutting down the machine.

According to a third aspect of the present invention, when the power is turned on again, a warning is generated, and the operation of starting counting of the elapse of the predetermined time is performed by the operator or the machine , the elapse of the predetermined time from there. The operation of the machine tool is allowed during the period until it is satisfied, and the operation of the machine tool is restricted after the passage of the predetermined time . Therefore, even when the relocation of the machine tool is detected due to a misjudgment, the problem that the machine stops suddenly during the machining operation can be dealt with with a sufficient margin.

Further, in the invention of claim 4, since it is determined that the operator has confirmed that the warning has been generated and the passage of the predetermined time is satisfied, the operation of the machine tool is limited. Therefore, it is possible to know more reliably that the determination to move the machine has been made, and it is possible to more reliably avoid a sudden stop of the machine or to prepare for the stop.

In the invention of claim 5, after it is determined that the machine has notified the machine manufacturer that a warning has been generated, the operation of the machine tool is limited when the passage of the predetermined time is satisfied. Therefore, the manufacturer of the machine can know more reliably that the decision to move the machine has been made, can notify the user of the machine of a workaround for a sudden stop of the machine, and be sure to prepare for the stop. Can do.

In the invention of claim 6, the predetermined time is set as a time that the operator can easily and surely recognize as a time required for the processing preparation or a time required for the actual processing. It is possible to cope with the machine stop in a state where it is surely recognized that the machine is stopped, and therefore it is possible to avoid a situation where the machine suddenly stops.

In the invention of claim 7 , since the passage of the predetermined time is stopped during the period when the operation of the machine is stopped due to tool change or the like, a certain amount of machining can be performed during the set predetermined time. From this point, the machine can be stopped.

1 is a block diagram showing a schematic functional configuration of an operation control device for a machine tool according to an embodiment of the present invention. FIG. It is a flowchart which shows the control action of the said operation control apparatus.

  Examples of the present invention will be described below.

  In the figure, reference numeral 10 denotes a machine tool, for example, a lathe. A lathe 10 according to the first embodiment includes a machine main body 1 having a structure similar to that of a conventional machine, and an operation control device 2 having a function of preventing unauthorized transfer of the machine main body 1 and the lathe 1.

The machine body 1 includes a processing unit 1a that performs machining by operating a tool of a tool post while gripping and rotating a workpiece with a spindle chuck, and a CPU, RAM, ROM, and the like. An NC device 1b that controls the operation of the various drive units that are configured, an input unit 1c that receives a machining program, an external instruction signal, and the like, a display unit 1d that displays an external instruction state, a machine state, and the like Have.

The operation control device 2 includes a controller 7 having a CPU, RAM, ROM and the like. The controller 7 performs the following functions. That is, when a predetermined relocation condition that the lathe 10 is considered to have been relocated is satisfied, the relocation detection unit 3 that detects the relocation condition is detected, and the relocation detection unit 3 detects that the predetermined relocation condition has been satisfied. Or a warning generation unit 4 that warns that an abnormality has occurred in the relocation detection unit 3, and a predetermined operation performed by the operator after the warning. The function is performed as an operation restriction unit 5 that restricts the operation of the machine when satisfied, and an operation restriction release unit 6 that releases the operation restriction when a predetermined release condition is satisfied.

In addition, you may comprise so that each function as a transfer detection part etc. of the said operation control apparatus 2 may be performed by the said NC apparatus 1b.

Here, the predetermined relocation condition in which the lathe 10 is relocated is, for example, that the vibration value of the vibration detection signal a input from the vibration detection sensor 1e attached to the machine body 1 is equal to or greater than a predetermined threshold. . The relocation detecting unit 3 determines that the lathe 10 has been relocated when the vibration value is equal to or greater than the threshold value.

In addition, the warning generation unit 4 detects that the predetermined relocation condition is satisfied in a state where the power is turned on, or the abnormality is generated in the relocation detection unit 3, and then the power is cut off. After the power is turned on again, the warning is issued by displaying the relocation detection or abnormality detection on the display unit 1d as an image or the like.

The predetermined operation performed by the operator means, for example, an operation of inputting, by a key operation or the like, that the operator has confirmed the warning displayed on the display unit 1d. The controller 7 further executes a function as a warning confirmation determination unit 4a that determines whether or not the operator has confirmed the warning based on the presence or absence of a key operation.

Further, when the warning confirmation determination unit 4a confirms that the operator has confirmed the warning issued by the warning generation unit 4 after the power is turned on again, the operation restriction unit 5 starts from that point. The operation of the lathe 10 is allowed until a predetermined operation restriction condition, for example, a predetermined time (period) elapses, and the operation of the lathe 10 is limited after the predetermined time (period) elapses.

Here, as the predetermined time, for example, a time required for an operator to prepare for machining a certain workpiece or a time necessary for actually machining the workpiece is selected.

Further, when counting down the elapse of the predetermined time, the countdown is stopped during a period in which the operation of the machine is stopped for some reason.

The predetermined operation restriction condition is not limited to the elapse of a predetermined period, and may be execution of a predetermined control panel operation, for example.

The operation restriction release unit 6 releases the operation restriction of the machine when a predetermined release condition, for example, “input password” is satisfied after the operation restriction.

The operation limiting operation by the controller 7 of the operation control device 2 will be described more specifically with reference to a flowchart (FIG. 2).

When the power supply 8 of the lathe 10 is turned on (step S1), an initial check of various functions and the like of the controller (relocation detection unit) 7 is performed (step S2). Then, the presence or absence of the relocation detection signal from the relocation detection unit 3 or the failure detection (abnormality) input signal b of the relocation detection unit 3 is determined (step S3), and if neither the relocation detection signal nor the failure input signal is present, The use of the lathe 10 is permitted (step S4), and the operations of steps S3 to S4 are always repeated. Therefore, the use can be continued while the lathe is in use, and the use can be started when the use is stopped.

On the other hand, in step S3, if a relocation detection signal is input, that is, if it is determined that relocation of the machine body 1 has been performed regardless of misjudgment or normality determination, or the relocation detection unit 3 fails. If a relocation is detected, and a predetermined operation restriction condition, for example, “elapse of a predetermined grace period” is satisfied, a grace function that disables the machine is used. A screen is displayed on the display unit 1d (step S5).

Here, as the predetermined grace period, for example, the time required for the operator to prepare for machining a certain workpiece or the time necessary to actually machine the workpiece is selected as described above.

Subsequently, the operator is required to perform a predetermined operation as to whether or not to use the grace function (step S6). When the operator depresses the cancel button and rejects the use of the grace function, The failure is displayed on the screen (step S7).

On the other hand, if the operator presses the grace start button in step S6 and permits the use of the grace function, the presence / absence of the remaining grace period is determined (step S8), and if there is no remaining grace period, the use of the lathe 10 is used. Is immediately prohibited (step S9). Further, when there is a remaining grace period, the countdown between remaining grace periods is continued until the remaining grace period disappears (steps S10, S11, S8), and when the remaining grace period disappears, the machine is prohibited from being used ( Steps S8 and S9).

Further, during the countdown during the remaining grace period, the countdown is stopped during a period in which the operation of the machine is stopped for some reason, such as during a tool change.

As described above, in this embodiment, after the transfer of the machine main body 1 is detected and the grace function are displayed on the display unit 1d, a warning is given, and further, the operator selects whether to use the grace function. In this case, the operation of the lathe 10 is prohibited when a predetermined grace period elapses. Therefore, the operator operates the machine when the machine body 1 is moved by a warning and when the grace period elapses thereafter. It is possible to know in advance that it will not be performed, and it is possible to avoid sudden failure of the machine by negotiating with the machine manufacturer before the grace period elapses.

In this embodiment, since the warning is generated when the power is turned off and then turned on again, it is easy for the operator to notice the warning, so that it is possible to more reliably prepare for the operation stop of the machine. In addition, since the operation of the machine is permitted until the power is turned off after the relocation is detected and until the predetermined grace period elapses after the power is turned off and then turned on again, the machine is not relocated. Even when it is detected by erroneous determination, it is possible to avoid the problem that the machine stops suddenly during the machining operation.

In addition, the predetermined time, which is the operation restriction condition, is set to a time that the operator can easily and reliably recognize as the time required for machining preparation or the time required for actual machining. It is possible to respond to the machine stop with a certain recognition that the machine will stop.

Furthermore, since the passage of the predetermined time is stopped during the period when the operation of the machine is stopped, a certain amount of processing can be performed during the set predetermined time, and from this point, the machine can be stopped. .

Even if the use of the lathe 10 is once prohibited, the operation restriction can be released by satisfying a predetermined release condition such as inputting a password, and the use of the machine can be resumed. Normally, the password is stored by the manufacturer or seller of the machine, and a valid machine user can obtain the password, and if the relocation detection is misjudgment or is a valid relocation , You can resume using the machine. On the other hand, if the machine is illegally moved to an export-prohibited country, the machine cannot be used because the password cannot be entered.

Further, when the relocation of the machine body 1 is detected, the warning is displayed on the screen, and the operator is made to determine whether or not the grace function can be used, and a predetermined grace period is set based on the determination that the grace function can be used. Since the configuration is such that the use of the lathe 10 is prohibited after a lapse of time, if the transfer determination is an erroneous determination, it is possible to prevent the machine from being disabled due to an erroneous determination by rejecting the use of the grace function. Even if a normal determination is made, since the use of the machine is permitted until a predetermined grace period elapses from the determination of whether or not the grace function can be used, the machine suddenly stops. Can be reliably prevented. Since the operator is in contact with the machine every day, it is obvious to the operator whether or not the machine has been relocated. Therefore, the determination by the relocation detection unit 3 is a misjudgment or normal determination, that is, the use of the grace function. It can be considered that it is easy for the operator to determine whether it is possible.

In the above embodiment, the use of the machine is prohibited when the operator has confirmed the relocation detection, and when a predetermined grace period has elapsed from this point. Starting from the notification to the manufacturer, the use of the machine may be prohibited when a predetermined grace period has elapsed. In this case, the controller 7 may be configured to function as a warning notification determination unit that determines whether the machine has notified the relocation detection to the machine manufacturer.

In the embodiment, for example, after the transfer is detected, the warning is generated when the power is once turned off and then turned on again due to the end of processing or the like. The timing is not limited to the above embodiment. For example, when the transfer of the machine main body 1 is detected, an image may be immediately displayed on the display unit 1d for warning.

In the above-described embodiment, the operation restriction condition for restricting the operation of the machine is the passage of a predetermined grace period after the warning, but the predetermined time in the present invention includes, for example, the passage of a predetermined energization time, That is, it is also possible to adopt that the machine has actually been operated for a predetermined time.

2 Operation Control Device 3 Relocation Detection Unit 4 Warning Generation Unit 4a Warning Confirmation Determination Unit 5 Operation Limiting Unit 8 Power Supply 10 Lathe (Machine Tool)

Claims (7)

A relocation detection unit that detects when a predetermined relocation condition that the machine tool is relocated is satisfied;
A warning generation unit that warns that the relocation detection unit has detected that a predetermined relocation condition is satisfied, or that an abnormality has occurred in the relocation detection unit;
After the warning by the warning generation unit, the operation is started by the operator or the machine to start counting the lapse of the predetermined time , and then the machine is operated when the lapse of the predetermined time is satisfied. An operation control device for a machine tool, comprising: an operation limiting unit for limiting. In the machine tool operation control device according to claim 1,
The operation control device for a machine tool, wherein the warning generation unit generates the warning when the power is turned off and then turned on again. The operation control device for a machine tool according to claim 2,
The operation restricting unit detects that a predetermined relocation condition is satisfied in a state where the power is turned on, or after the abnormality is detected in the relocation detecting unit, the power is cut off, and after the power is cut off, After the power is turned on again, the operation of the machine tool is performed during the period from the start of the operation for starting the counting of the lapse of the predetermined time by the operator or the machine until the lapse of the predetermined time is satisfied. An operation control device for a machine tool, which permits and limits the operation of the machine tool after the passage of the predetermined time . In the machine tool operation control device according to any one of claims 1 to 3,
The warning generation unit determines whether a predetermined relocation condition has been met, or whether the relocation detection unit has detected an abnormality and determines whether the operator has confirmed the warning. A warning confirmation determination unit is further included, and the operation restriction unit restricts the operation of the machine tool when the passage of the predetermined time is satisfied after the warning confirmation determination unit determines that the operator has confirmed the warning. An operation control device for a machine tool. In the machine tool operation control device according to any one of claims 1 to 3,
The warning generation unit generates the warning when it is detected that a predetermined relocation condition is satisfied or when an abnormality occurs in the relocation detection unit, and the machine manufacturer indicates that the warning has occurred. A warning notification determination unit that determines whether or not the warning has been notified to the operation side, and the operation restriction unit satisfies the passage of the predetermined time after the warning notification determination unit determines that the machine has notified the warning. The machine tool operation control device is characterized by restricting the operation of the machine tool when the machine tool is operated. In the machine tool operation control device according to any one of claims 1 to 5 ,
The operation control device for a machine tool, wherein the predetermined time is a time required for an operator to prepare a predetermined workpiece for processing or a time required for actual processing. The operation control device for a machine tool according to claim 6,
The operation limiter stops the passage of the predetermined time during a period in which the operation of the machine is stopped.

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