JP2009181174A - Numerical control device with function to stop machine tool by earthquake information - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a numerical control device for stopping the operation of a program or for saving a tool by a block in which any work is not cut by using earthquake information. <P>SOLUTION: The numerical control device 1 includes: an earthquake information reception part A for receiving earthquake information Sig; an execution block prediction part B for specifying a prediction execution block at the prediction time of earthquake occurrence; an operation stop block specification part C for specifying an operation stop block whose main shaft stops or whose tool or work moves with rapid traverse from the block under execution to the prediction execution block when receiving the earthquake information Sig; a program operation stop control part D for stopping a program operation from the start of the execution to the end of the execution of the operation stop block; and a saving control part E for saving the tool or the work when the program operation is stopped by the program operation stop control part D. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a numerical control device, and more particularly to a numerical control device using earthquake information.

  The Japan Meteorological Agency has released several times (about 5 to 10 times) of information within a few seconds to a minute after the earthquake was detected as an early earthquake warning. The first report gives priority to promptness, and the accuracy of information provided thereafter gradually increases. The final report was published when it was considered that the accuracy was almost stable, and the provision of the earthquake early warning for the earthquake was terminated.

  Further, Patent Document 1 predicts from the first and second hypocenter determination systems that determine the hypocenter information based on information from the seismic observation network, and the hypocenter information received from the first and second hypocenter determination systems. A source information selection / synthesis unit for generating source information for earthquakes, a predicted value of a seismic intensity scale in a predetermined area from a predicted source information, and a predicted value of a margin time until the main motion of the earthquake reaches the area An emergency earthquake warning device including an earthquake prediction information generation unit that generates earthquake prediction information and an output unit that outputs earthquake prediction information is disclosed.

  In the event of an earthquake, the numerical control device and the machine controlled by the numerical control device will not be destroyed, and in order not to cause human damage due to the destruction of the machine, the program operation is immediately and unconditionally. Has stopped.

JP 2006-112922 A

When an earthquake occurs, if the programmed operation of the machine tool is immediately stopped unconditionally and the tool or workpiece is evacuated, the following problems may occur.
(1) Traces of contact with the tool remain on the workpiece being machined and the machining surface becomes defective.
(2) When the operation is restarted from the block that was being executed when the operation of the numerical control device was stopped, the machined surface may come into contact with the tool, and thus the machining program needs to be corrected. Therefore, it takes time to process the workpiece.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a numerical control device capable of stopping a program operation and retracting a tool with a block that does not cut a workpiece using earthquake information.

  The invention according to claim 1 of the present application includes an earthquake information receiving unit that receives earthquake information including at least a predicted time or an estimated time until the occurrence of an earthquake, and the earthquake information receiving unit during actual machining of a workpiece with a machine tool. When the information is received, the execution block prediction means for specifying the prediction execution block at the predicted time of occurrence of the earthquake, and the execution block prediction means from the block being executed when the earthquake information reception unit receives the earthquake information. The operation stop block specifying means for specifying the block for stopping the spindle of the machine tool or the operation stop block for moving the tool or the workpiece by rapid traverse until the specified prediction execution block is specified by the operation stop block specifying means. Program operation stop means for stopping the program operation from the start of execution of the operation stop block to the end of execution; If the program operation by serial program operation stopping means has stopped, a numerical controller having a function of stopping the machine tool by the earthquake information and a retracting means for retracting the tool or the workpiece.

The invention according to claim 2 is characterized in that the program operation stop means further stops the program operation immediately in the block being executed when the operation stop block is not specified by the operation stop block specifying means. 1 is a numerical control device having a function of stopping a machine tool according to earthquake information according to 1;
The invention according to claim 3 is provided with machining resumption information storage means for storing information necessary for resuming machining of the workpiece when the operation of the machine tool is stopped based on the earthquake information. It is a numerical control device having a function to stop the machine tool by the earthquake information described in one.

    According to the present invention, it is possible to provide a numerical control device having a function of stopping a machine tool based on earthquake information, which can execute program operation stop and tool retraction in a block in which a workpiece is not processed.

Hereinafter, an embodiment of a numerical controller 1 having a function of stopping a machine tool according to earthquake information according to the present invention will be described with reference to the drawings.
FIG. 1 is a principal block diagram of the numerical controller 1. A manual operation panel (LCD / MDI) 9 with a liquid crystal display device is connected to the numerical controller 1 via the interface 2. In the digital servo function 3, a digital signal processor (DSP) is used as a servo control unit. The position, speed, and current of the servo motor 10 are controlled by servo control software. Information on the current value flowing through the servo motor 10 and the rotation angle of the motor is fed back to the servo control unit and used for the next calculation. The spindle control function 4 commands the rotational speed of the spindle motor 11, monitors the load current of the spindle motor 11, and controls the position and speed to be used as a feed motor. The PMC function 5 is a programmable machine controller function, and performs, for example, sequence control of auxiliary functions (M, S, T) commanded by the machining program via the I / O unit 12 to rotate the spindle. This function controls the stop and automatic tool changer.

  The NC function 6 performs control for instructing the path of the tool with respect to the workpiece and other processes necessary for machining with numerical information. For example, the position and speed of the tool are controlled along an arbitrary curve in a three-dimensional space by an interpolation function.

  The earthquake information reception function 7 is a function for acquiring earthquake early warnings transmitted by the Japan Meteorological Agency and earthquake information transmitted from other earthquake observation networks from information transmission means such as the Internet, broadcasting, wireless communication, and telephone lines. is there. The acquired earthquake information includes at least information related to the predicted time until the occurrence of the earthquake (main motion) and the predicted arrival time of the earthquake.

  The communication function 8 has a function of taking information (for example, a machining program) into the numerical controller 1 from an external personal computer or the like via an interface.

FIG. 2 is a functional block diagram of the numerical control apparatus 1 having a function of stopping the machine tool according to the earthquake information according to the present invention.
A numerical control apparatus 1 that controls a machine tool that processes a workpiece includes an earthquake information receiving unit A that receives an earthquake information Sig including an estimated time until the occurrence of an earthquake or an estimated arrival time of an earthquake, and the workpiece is executed by the machine tool. When the earthquake information is received by the earthquake information receiving unit during processing, the execution block prediction unit B that identifies the prediction execution block at the predicted time of occurrence of the earthquake and the earthquake information reception unit A received the earthquake information Sig An operation stop block specifying unit that specifies a block in which the spindle of the machine tool stops or an operation stop block in which a tool or a workpiece moves by rapid traverse between the block currently being executed and the prediction execution block specified by the execution block prediction unit B C and stop the program operation between the start of execution and the end of execution of the operation stop block specified by the operation stop block specifying unit C. Cormorants program operation stop control unit D, if the program operation with the program operation stop control section D is stopped, includes a saving control unit E for saving the tool or the workpiece, its features. The retraction control unit E, for example, retreats the tool to a predetermined position for each machine tool, retreats to a machine coordinate position that can be set by parameters, etc., or with respect to the direction that was operating before stopping In the reverse direction, control is performed so as to retreat to a position separated by a distance or time determined by a parameter or the like.

Further, when the operation stop block is not specified by the operation stop block specifying unit C, the program operation stop control unit D may immediately stop the program operation in the block being executed by the numerical control device 1. .
Further, the numerical control device 1 may include a machining resumption information storage unit F that stores information necessary for resuming machining of a workpiece when the operation of the machine tool is stopped based on the earthquake information Sig.

  And by these functions, the numerical control apparatus 1 which is embodiment of this invention can implement | achieve the function which stops a machine tool and evacuates a tool and a workpiece | work based on earthquake information Sig. Thereby, the programmed machining can be executed from the time when the programmed operation is stopped, and the trace of contact with the tool remains on the workpiece being machined to prevent the machined surface from becoming defective. Furthermore, by providing a machining resumption information storage unit, machine tool work machining can be smoothly recovered.

  In addition, by stopping the spindle motor when the program operation is stopped, even if the workpiece or tool is detached from the spindle due to the impact of an earthquake, it is controlled so that they do not fly due to centrifugal force and do not pose a danger to the operator. It is also possible.

FIG. 3 is a flowchart showing an algorithm for specifying a prediction execution block at a predicted time of occurrence of an earthquake. Hereinafter, it demonstrates according to each step.
The predicted time Te until the occurrence of the earthquake is acquired from the earthquake information Sig (step S100). The total value Tc of the time required for the operation for each block is initialized to 0 (step S101). The block number currently being executed is substituted into the operation time calculation block number Bc (step S102). The feed speed Fc when executing the operation time calculation block number Bc is acquired (step S103). The movement distance Lc when executing the operation time calculation block number Bc is acquired (step S104). A total value Tc of the time required for operation for each block is calculated. Tc is calculated by Tc = Tc + (Lc / Fc) (step S105).

  Next, it is determined whether or not the total value Tc calculated in step S105 is greater than the predicted time Te. If it is larger, the process proceeds to step S109, and if smaller, the process proceeds to step S107 (step S106). If it is determined in step S106 that the total value Tc is greater than the predicted time Te, the operation time calculation block number Bc is stored as the execution block number at the predicted earthquake occurrence time (step S109), and the process ends.

  On the other hand, if it is determined in step S106 that the total value Tc is not greater than the predicted time Te, it is determined whether or not the operation time calculation block number Bc is greater than or equal to the maximum block number in the machining program (S107). If it is equal to or greater than the maximum block number of the program, the process proceeds to step S109, and if it is less than the maximum block number of the machining program, the process proceeds to step S108. In step S108 transferred from step S107, the operation time calculation block number Bc is incremented by one (step S108), and then the process returns to step S103 to continue the processing.

  FIG. 4 is a flowchart showing an algorithm until the program operation is stopped after the prediction execution block at the predicted time of occurrence of the earthquake is specified. Hereinafter, it demonstrates according to each step.

  The currently executed block number is substituted for the operation stop determination block number Bs (step T100), and it is determined whether the operation stop determination block number Bs is a block number of a block having a command to stop the spindle or a fast-forward command. (Step T101). If it is determined in step T101 that the block has a command for stopping the spindle or a fast-forward command, the process proceeds to step T108, and if it is determined that the block does not have the command, the process proceeds to step T102.

On the other hand, if it is determined in step T101 that the block has a command for stopping the spindle or a fast-forward command, the block waits until the block number being executed becomes equal to Bs (step T108), from the start of execution of the operation stop determination block. The program operation is stopped until the end of execution (step T105), and the operation stop block number Bs is stored in the memory (step T106).
On the other hand, if it is determined in step T101 that the block does not have a command to stop the spindle or a fast-forward command, it is determined whether or not the operation stop determination block number Bs is equal to or greater than the execution block number at the predicted occurrence time of the earthquake. (Step T102).

On the other hand, if it is determined in step T102 that the operation stop determination block number Bs is greater than or equal to the execution block number at the predicted earthquake occurrence time, the program operation is immediately stopped (step T104), and the operation stop block number Bs is set. Save in the memory (step T106).
On the other hand, if it is determined in step T102 that the operation stop determination block number Bs is not greater than or equal to the execution block number at the earthquake occurrence prediction time, the operation stop determination block number Bs is incremented by 1 (step T103), and thereafter Return to step T101 and continue the process.

  FIG. 5 is an example of a machining program executed by the numerical controller 1 having the function of stopping the machine tool according to the earthquake information according to the present invention. The function of stopping the machine tool according to the earthquake information of the present invention will be described using an example of this machining program.

First, an example of a machining program will be described. O1000 means that the program is No1000. N001 to N018 mean block numbers. Hereinafter, description will be given according to block numbers.
Block N001 sets a workpiece coordinate system and sets a tool start point. Also, the command for canceling the tool length correction, canceling the tool radius correction, canceling the fixed cycle, and operating on the XY plane is also performed. Block N002 specifies that the machine moves to the machine origin position by rapid traverse. Block N003 designates tool change to tool number 01. Block N004 specifies operating in fast forward.
Block N005 sets the spindle speed to 1000 revolutions per minute, and specifies that the spindle is to be activated by clockwise rotation.
Block N006 turns on the cutting oil pump.

  Block N007 designates cutting at a cutting speed set to 300 mm / min in the Z direction. A block N008 designates the XY plane, and designates cutting at a cutting speed of 300 mm per minute in the XY plane. Block N009 designates arc cutting. Block N010 specifies linear cutting.

  Block N011 specifies that the tool is to be moved back in rapid traverse. Block N012 specifies that the machine moves to the machine origin position by rapid traverse. Block N013 designates the spindle stop. Block N014 designates a tool change to tool number 02. Block N015 specifies that the spindle is to be activated by clockwise rotation.

  A block N016 designates the XZ plane and designates that the fast-forward operation is performed. Block N017 specifies cutting at a cutting speed of 300 mm / min in the Z direction. A block N018 designates an XY plane, and designates that cutting is performed at a cutting speed of 300 mm per minute in the XY plane.

  In the program No1000 which is an example of the program shown in FIG. 5, the blocks where the spindle stops or stops are the block N001, the block N002, the block N003, the block N004, the block N013 and the block N014. N002, block N004, block N011, block N012, and block N0016.

  FIG. 6 is a diagram showing the relationship between the execution time of each block of the machining program, the reception of earthquake information, and the predicted time predicted by the earthquake information. FIG. 6 shows the execution time of each block from block N007 to block N012. FIG. 6 shows that the earthquake information is received in block N007, and when the predicted earthquake occurrence times overlap during execution of block N010 (hereinafter referred to as “case 1: predicted time Te”) and execution of block N012. The case where the predicted earthquake occurrence time overlaps (hereinafter referred to as “case 2: predicted time Te”) is shown.

  Here, when earthquake information is received during execution of block N007, processing for specifying an execution block at the predicted earthquake occurrence time is executed according to the flowchart of the algorithm shown in FIG. In step S102 of FIG. 3, the number N007 of the block N007 is substituted for the operation time calculation block number Bc. The feed rate Fc obtained in step S103 is 300 mm per minute. The moving distance Lc acquired in step S104 is 20 mm. Based on these acquired values, it is possible to calculate the total value Tc of the time required for operation for each block in step S105.

  Case 1 shown in FIG. 6: In the case of the predicted time Te, there is no block in which the spindle stops or fast-forwards in the block N007 to block N0010. Therefore, if processing is performed according to the algorithm for stopping the program operation shown in FIG. Then, the program operation is immediately stopped at block N007 which is a block currently being executed.

  Case 2 shown in FIG. 6: In the case of the predicted time Te, there is a fast-forward block N011 in the blocks N007 to N012. Therefore, when processing is performed in accordance with the algorithm for stopping the program operation shown in FIG. 4, the process waits until the fast-forward block N011 is executed in step T108. In other words, when the execution of the machining program proceeds to block N011, the process proceeds to step T105. Then, the program operation is stopped in block N011, and block N011 is stored as an operation stop block in step T106.

  As shown in FIG. 5, the machining program includes an M code command (M05) for stopping the spindle, a G code modal (G01, G02, G03, etc.) and a G code command (G28, G30, G53) which are parent feed commands. and so on. Whether or not the block is for stopping the spindle can be determined by whether or not an M code command (M05) for stopping the spindle has been executed. Whether or not it is a fast-forward block can be specified by a G code modal or a G code command. The speed information can be extracted from the F code command, and the movement distance can be extracted from an axis movement command such as an X, Y, Z command.

  Some numerical control devices for controlling machine tools have a look-ahead function. In this numerical control apparatus, since the blocks to be executed in the future have already been analyzed, it is possible to implement the function of stopping the machine tool with the earthquake information according to the present invention at higher speed. In addition, even when a machining program existing on the SRAM is read and analyzed, an F code command and an axis movement command can be quickly extracted.

  The numerical control device having the function of stopping the machine tool according to the earthquake information of the present invention is configured so that the earthquake information receiving unit receives the initial fine motion before receiving the earthquake information including the predicted time until the occurrence of the earthquake or the predicted arrival time of the earthquake. When a P-wave detection signal from a P-wave sensor, which is a seismometer that detects P-waves, is input to the earthquake information receiver, the program operation of the numerical controller is immediately stopped and the tool or workpiece is retracted. You may do it. The P wave detection signal input after receiving the earthquake information may be ignored and processed according to the algorithm described above.

It is a principal part block diagram of the numerical control apparatus which has a function which stops a machine tool by the earthquake information which is this invention. It is a functional block diagram of the numerical control apparatus which has a function which stops a machine tool by the earthquake information which is this invention. It is a flowchart which shows the algorithm for specifying the prediction execution block in the prediction time of an earthquake occurrence. It is a flowchart which shows the algorithm until it stops a program driving | operation after specifying the prediction execution block in the prediction time of an earthquake occurrence. It is an example of the processing program performed with the numerical control apparatus which has a function which stops a machine tool by the earthquake information which is this invention. It is a figure which shows the relationship with the estimated time estimated by the execution time of each block of a process program, earthquake information reception, and earthquake information.

Explanation of symbols

1 Numerical control device 2 Interface 3 Digital servo function 4 Spindle control function 5 PMC function 6 NC function 7 Earthquake information reception function 8 Communication function 9 LCD / MDI
DESCRIPTION OF SYMBOLS 10 Servo amplifier, servo motor 11 Spindle amplifier, Spindle motor 12 I / O unit 13 Bus Sig Earthquake information A Earthquake information receiving part B Execution block prediction part C Operation stop block specific part D Program operation stop control part E Retraction control part F Machining Resumption information storage part G Spindle motor part H Servo motor part

Claims (3)

An earthquake information receiving unit for receiving earthquake information including at least an estimated time until an earthquake occurs or an estimated time;
Execution block prediction means for specifying a prediction execution block at the predicted time of occurrence of the earthquake when the earthquake information is received by the earthquake information receiving unit during actual machining of a workpiece with a machine tool;
Between the block being executed when the earthquake information receiving unit receives the earthquake information and the prediction execution block specified by the execution block prediction means, the tool or workpiece is stopped or fast-forwarded by the block where the spindle of the machine tool stops. An outage block identifying means for identifying an outage block to be moved;
Program operation stop means for stopping the program operation between the start of execution of the operation stop block specified by the operation stop block specifying means and the end of execution;
When the program operation is stopped by the program operation stop means, the retreat means for retreating the tool or the workpiece,
A numerical control device having a function of stopping a machine tool based on earthquake information.   2. The program operation stop means further uses the earthquake information according to claim 1 to stop the program operation immediately in the block being executed when the operation stop block is not specified by the operation stop block specifying means. A numerical control device having a function of stopping the machine.   3. The machine according to claim 1, further comprising machining resumption information storage means for storing information necessary for resuming machining of the workpiece when the operation of the machine tool is stopped based on the earthquake information. A numerical control device having a function of stopping the machine.

Images