JP6574671B2 - Method of executing contact welding detection test of electromagnetic switch in press machine and press machine - Google Patents

Description

  The present invention relates to a press machine and a method for performing a contact welding detection test of an electromagnetic switch in the press machine, and more particularly, to a machine equipped with a motor as a drive source for a press operation.

A press working machine such as a punch press that uses a motor as a drive source for press operation usually has an electromagnetic switch that opens and closes a power supply circuit that energizes the motor (see Patent Document 1).
Further, the press machine includes a safety device that opens the electromagnetic switch in an emergency to cut off the power supply to the motor so that the press operation cannot be performed.
However, when the energization time in the closed state becomes longer, the electromagnetic switch is assumed to be unable to open the circuit due to welding of contacts in some cases.
Therefore, in general, a press machine using a motor as a drive source can execute a test for detecting the presence or absence of contact welding of an electromagnetic switch by cutting off the entire power circuit.
Conventionally, various devices for detecting contact welding of an electromagnetic switch have been studied, and are disclosed in Patent Documents 2 and 3, for example.

  The test for detecting the presence or absence of contact welding of an electromagnetic switch in a press machine is also referred to as an MCC interruption test because the electromagnetic switch corresponds to a motor control unit (MCC). Here, it is simply referred to as an interruption test.

Japanese Patent Laid-Open No. 11-033800 JP-A-4-267015 JP-A-9-281171

In the conventional press machine, the interruption test is automatically executed when the press machine is turned on, and when a predetermined time (for example, 24 hours) has passed since the previous interruption test, the operator HB is instructed to execute the interruption test. The image or sound is output for prompting.
Accordingly, in the case where the press machine is operated intermittently without turning off the power, or when the press machine is continuously operated for a long period of time, such as during a busy production period, the execution of the interruption test by the operator HB is not required. It is assumed that the operation is continued without performing the period interruption test. Therefore, an improvement for ensuring higher safety has been desired.

In addition, as a device for detecting that an operator HB or an object has approached the press machine too much, it is called a so-called light curtain in which a plurality of optical axis arrays that divide the area to be detected by a predetermined distance are arranged. Intrusion detection devices are becoming popular.
The light curtain is a safety device that detects the entry of an operator HB or an object into the partitioned area, but has not been devised for cooperation with the interruption test.
For this reason, when the press machine is equipped with an entry detection device such as a light curtain, it is desirable to devise an approach that can ensure higher safety by effectively linking the operation of the entry detection device and the operation of the interruption test. It was.

  Therefore, a problem to be solved by the present invention is to provide a press machine that can ensure higher safety and a method for executing a contact welding detection test of an electromagnetic switch in the press machine.

In order to solve the above problems, the present invention has the following configuration or procedure.
1) a motor as a drive source for the press operation;
An electromagnetic switch provided in a circuit for supplying power to the motor;
Detects the contact welding presence of the electromagnetic switch, after detecting the execution of the contact welding existence of previous trigger that the end of the machining program for performing the press operation before the elapse of the first predetermined time set in advance when produced it does not perform the detection of the contact welding presence again, after detecting the execution of the contact welding existence of previous, when the trigger in a period after the first predetermined time has elapsed occurs and contact welding detecting device performs the detection of the contact welding presence again,
It is a press machine characterized by comprising.
2) a motor as a drive source for the press operation;
An electromagnetic switch provided in a circuit for supplying power to the motor;
A safety device for detecting the approach of a person or object;
Detects the contact welding presence of the electromagnetic switch, after detecting the execution of the contact welding existence of previous trigger that approach detection of human Further objects by the safety device before the lapse of the first predetermined time set in advance If the without performing detection of the contact welding presence again if occurs, after detecting the execution of the contact welding absence of previous the trigger in a period after the first predetermined time has elapsed has occurred and contact welding detecting device performs the detection of the contact welding whether again,
It is a press machine characterized by comprising.
3) after detection execution of the contact welding existence of previous, when passed a second predetermined time set in advance rather long than the first predetermined time without the trigger occurs, the detection of the contact welding presence The press machine according to 1) or 2), wherein a message prompting execution is output.
4) A method for performing a contact welding detection test of an electromagnetic switch in a press machine for executing a contact welding detection test of an electromagnetic switch included in the press machine,
If after the end of the last of the contact welding detection test, before the lapse of the first predetermined time set in advance, the trigger that approaching detected is human or an object by the processing program is completed or safety device has occurred without performing the contact welding detection test again, after completion of the last of the contact welding detection test, the contact welding detection test when the trigger has occurred in the period after the first predetermined time has elapsed Is a contact welding detection test execution method for an electromagnetic switch in a press machine.
5) when the elapsed preceding the contact welding after completion of the detection test, the second predetermined time set in advance rather long than the trigger a predetermined time Ku before Symbol first thing that occurs, the contact welding detection 4. The contact welding detection test execution method for an electromagnetic switch in a press machine according to 4), wherein a message prompting execution of the test is output.

  According to the present invention, there is an effect that higher safety is ensured.

FIG. 1 is a block diagram for explaining the configuration of a punch press 51 that is an example of a press machine according to an embodiment of the present invention. FIG. 2 is a first diagram for explaining a method of executing a shut-off test in the punch press 51. FIG. 3 is a second diagram for explaining a method for executing a shut-off test in the punch press 51. FIG. 4 is a third diagram for explaining a method for executing a shut-off test in the punch press 51. FIG. 5 is a fourth diagram for explaining a method for executing a shut-off test in the punch press 51. FIG. 6 is a fifth diagram for explaining a method for executing a shut-off test in the punch press 51. FIG. 7 is a flowchart for explaining the procedure of the interruption test in the punch press 51. FIG. 8 is a partial flow diagram for explaining the procedure for manually executing the interruption test in the procedure of the interruption test. FIG. 9 is a partial flow diagram for explaining the procedure in the case where the approach detection is performed by the approach detection device in the procedure of the interruption test.

A configuration of a punch press 51 as an example of a press machine according to an embodiment of the present invention will be described with reference to the block diagram of FIG.
Also in the following description, a test for detecting the presence or absence of contact welding of an electromagnetic switch is referred to as a breaking test. The method of the interruption test is not limited, and a known method can be applied. Moreover, the interruption test may be a test for detecting whether or not the entire safety function is normal, including detection of the presence or absence of contact welding.

  The punch press 51 includes a press device 1 that performs press processing such as punching and forming on a plate-like workpiece, an NC device 11 that controls the operation of the entire punch press 51, communication with the outside, and operation input from the outside. Input device 21, an output device 31 that outputs information and the like to the outside, and a power supply device 41.

The press apparatus 1 has three servo motors as motors that are driven as drive sources for the press operation.
More specifically, the servo motor 2A and the servo motor 2B that move the die up and down in the press work and the work to be used for the press work independently on the work table in the X-axis direction and the Y-axis direction, respectively. And having.
Each of the servo motors 2, 2A, 2B includes servo motor units 1U, 1UA, 1UB including incidental members related to driving.
Each servo motor unit 1U, 1UA, 1UB has a common configuration, and the servo motor unit 1U will be described in detail as a representative.

  The servo motor unit 1U includes a servo motor 2 that selectively lifts and lowers a plurality of press working dies attached to the upper and lower support portions. Further, the circuit unit 4 having the servo amplifier 3 that drives the servo motor 2 and the position of the servo motor 2 or the position of a member that moves in conjunction with the operation of the servo motor 2 are detected and output as position information J1. And an encoder 5. The position information J1 output from the encoder 5 is fed back to the servo amplifier 3.

In addition, power is supplied from the power supply device 41 to members that operate with power in the press device 1 (see the dashed line arrow). FIG. 1 shows that power is supplied from the power supply device 41 to the circuit unit 4, the servo motor 2, the NC device 11, and the like.
In particular, an electromagnetic switch 6 having a thermal relay 6a and an electromagnetic contactor 6b is connected in series in a power supply path between the servo motor 2 and the power supply device 41.
The electromagnetic switch 6 includes a circuit breaker that interrupts conduction between the power supply device 41 and the servo motor 2 separately from the electromagnetic contactor 6b, and a current that flows through the contact of the electromagnetic contactor 6b in a state where the conduction is cut off. The contact welding detector 6c having a continuity determination device for determining the presence / absence of continuity is included.

Servo motor units 1UA and 1UB having the same configuration as the servo motor unit 1U include servo motors 2A and 2B, servo amplifiers 3A and 3B, circuit units 4A and 4B, encoders 5A and 5B, and electromagnetic switches 6A and 6B, respectively. have.
In FIG. 1, only the servo motor unit 1U is shown as a representative, and the servo motor units 1UA and 1UB and members included therein are shown only by reference numerals.

Servo motor units 1U, 1UA, 1UB are connected in parallel to NC device 11 and power supply device 41.
That is, the control of the NC device 11 is performed independently in parallel with respect to the servo motor units 1U, 1UA, 1UB.
Further, the power supply by the power supply device 41 is supplied in parallel to the servo motor units 1U, 1UA, 1UB.

  The punch press 51 performs a shut-off test for each of the electromagnetic switches 6, 6A, 6B of the servo motor units 1U, 1UA, 1UB as described in detail below.

The NC device 11 includes a CPU 12 that is a central processing unit, a safe operation execution unit 13 that executes a safe operation in an emergency, and a block test execution unit 14 that executes a block test.
Further, the NC device 11 includes a storage unit 15 for storing a machining program PG and a machining condition file FL supplied from the outside, a timer 16 for counting time and sending time information J2 to the CPU 12, and a safe operation. And a PMC ladder 17 that controls an operation sequence of the execution unit 13 and the interruption test execution unit 14.

The input device 21 includes a communication unit 22 and an operation unit 23.
The communication unit 22 performs communication with the outside wirelessly or by wire. For example, the data J3 is received from the external server 61 via the Internet or a local area network, and sent to the CPU 12. The data J3 includes a machining program PG and a machining condition file FL.
The operation unit 23 includes operation switches such as a protective device reset button and an input device such as a keyboard. The operator HB inputs a power ON / OFF instruction and an interruption test execution instruction by the operator HB.

The punch press 51 can be equipped with an approach detection device called a so-called light curtain as a safety device, and in this example, an entrance detection device 32 is provided.
The approach detection device 32 emits a plurality of horizontal lights having LEDs as light sources so as to substantially form a vertical light wall in parallel in the vertical direction, and a plurality of horizontal lights emitted from the light output parts. And a light receiving portion that receives light independently.

When the approach detection device 32 is applied to the punch press 51, the light wall formed between the light emitting portion and the light receiving portion is moved when the worker HB moves closer to the processing portion of the punch press 51. Install across the flow line.
As a result, the entry detection device 32 detects the light shielding when an operator HB or the like approaches the processing part and passes through the light wall to block even one of the horizontal lights, and indicates that the entry has occurred. The detection information J4 is sent to the CPU 12.

  In the punch press 51 having the above-described configuration, the sequence relating to the execution of the interruption test is stored in the PMC ladder 17 and is executed, for example, including the following contents (1) to (6).

(1) When the power supply is turned on and the first interruption test T or the interruption test Ta executed thereafter is completed, the first elapsed time set in advance based on the OFF point of the test mode signal corresponding to the completion point Tm1 (first predetermined time) and a second elapsed time Tm2 (second predetermined time) longer than the first elapsed time Tm1 are counted. For example, the first elapsed time Tm1 is set to 20 hours, and the second elapsed time Tm2 is set to 24 hours (see FIG. 3).
(2) When a program end macro (G50, G10, M30, etc.) is read after the end of the interruption test Ta, if the read time is before the first elapsed time Tm1, a response signal (hereinafter FIN) is returned. The end of the program is confirmed without executing the interruption test (see FIG. 3).
If it is after the first elapsed time Tm1, FIN is not returned, a servo OFF command is issued to set the shaft interlock state, a test mode signal is turned ON in response to the servo OFF command, and a cutoff test is executed ( (See FIG. 3).
(3) The FIN for the program end macro is not returned during execution of the block test, but is returned when the block test is completed (see FIG. 7: S17 and S22).
Specifically, the axis interlock is released by a servo-off command accompanying the test mode signal being turned off, and FIN is returned after the release.
(4) The first elapsed time Tm1 and the second elapsed time Tm2 described above are counted from the time point when the test mode signal is OFF (see FIG. 3).
(5) Repeat the sequence of (2) to (4) until the power is turned off.
(6) If the program end macro is not read by the second elapsed time Tm1, a test request message (to be described later) is output to the outside through a screen or voice, and a blocking test is performed on the operator HB. Manual activation (execution instruction) is urged (see FIG. 7: S18).

The specific contents of these sequences will be described with reference to FIGS. 2 to 6 which are timing charts and FIGS. 7 to 9 which are flowcharts at respective timings A to C shown below.
Time A (see FIGS. 2 and 7): At power-on.
Time B (see FIGS. 3 and 7): period Pb before the first elapsed time Tm1 is reached and period Pb from the first elapsed time Tm1 to the second elapsed time Tm2 after the previous interruption test is executed .
Time C (see FIGS. 4 to 9): A period Pc after reaching the second elapsed time after the previous execution of the interruption test.

<Time A (see FIGS. 2 and 7)>
When the power is turned on (ON) from the operation unit 23 by the user (S1), the CPU 12 sends a shut-off test execution request signal to the output device 31 (ON), and "Please execute the shut-off test." Or the like (hereinafter referred to as a test request message) is output as an image or sound (S2).

The punch press 51 is set so that after the test request message is output, the machining operation cannot be performed unless the interruption test is executed.
The interruption test is executed by a reset (initialization) instruction of the protective device.
Accordingly, in response to the first test request message after the power of the punch press 51 is turned on, the worker HB presses a protective device reset button (not shown) of the operation unit 23 to reset the protective device (S3).

The resetting of the protective device serves as a trigger for executing the interruption test (detection of contact welding).
When the reset button is pressed and turned on, the CPU 12 turns on the servo-off signal.
To make the shaft interlock state.
In response to the servo-off signal being turned ON, the interruption test execution unit 14 turns ON the test mode signal and executes the first interruption test T after power-on (S4).

A period T1 in FIG. 2 is an interruption test period.
The interruption test execution unit 14 determines whether or not there is no abnormality as a result of the interruption test T (S5).
If it is determined that there is an abnormality (No), the NC device 11 outputs an alarm (S6), and then turns off the power (S7).
If it is determined that there is no abnormality (Yes), the interruption test execution unit 14 turns off the test mode signal. Based on the fall of this OFF, the CPU 12 releases the axis interlock state by turning the servo-off signal OFF.
Further, the interruption test execution request signal is turned OFF, and the output of the test request message is stopped (S8).

<Time B (see FIGS. 3 and 7)>
When the previous interruption test Ta (or interruption test T) is completed, the timer 16 resets the elapsed time from the time Tae, which is the time when the test mode signal is OFF, and newly starts counting (S9).
The CPU 12 monitors the elapsed time counted by the timer 16.
As for the elapsed time tk, as described above, the first elapsed time Tm1 and the second elapsed time Tm2 longer than the first elapsed time Tm1 are set in advance. Here, it is assumed that the first elapsed time Tm1 is set to 20 hours and the second elapsed time Tm2 is set to 24 hours.
The CPU 12 always monitors and determines whether or not an instruction to turn off the power is input during counting of the elapsed time tk (S10).
When the instruction is input, the power source of the punch press 51 is turned off (S7).

The timer 16 and the CPU 12 determine which of the periods Pa to Pc the elapsed time tk always corresponds to (S11).
In the punch press 51, after the previous interruption test Ta is completed, when the machining is completed in the period Pa in which the elapsed time tk is less than the first elapsed time Tm1 (S12), the interruption test is not executed.
That is, even if the machining program end macro is read (program end macro signal ON) and the traverser operation completion response is returned (ON), the interruption test is not executed, and the program end macro FIN is returned (S13). ). The elapsed time is not reset, and the process returns to the elapsed time determination (S11).
The program end macro is, for example, G50, G10, M30 or the like.

On the other hand, in the period Pb in which the elapsed time tk reaches the second elapsed time Tm2 from the first elapsed time Tm1, the machining program end macro is read (program end macro signal ON), and a traverser operation completion response is returned. If it has been done (ON), the punch press 51 executes the interruption test Tb.
That is, it is determined that the machining is completed in the period Pb (S14; Yes), and at that time, the machining program end macro (G50, G10, M30, etc.) is read (program end macro signal ON), and a traverser operation completion response is returned. When turned on (ON), the CPU 12 turns on the servo-off signal to enter the axis interlock state.

In response to the servo-off signal being turned ON, the interruption test execution unit 14 turns ON the test mode signal and executes the interruption test Tb in the period T2 (S15).
In this way, the end of the machining program becomes a trigger for executing the interruption test (detection of contact welding presence / absence).

The interruption test execution unit 14 determines whether or not there is no abnormality as a result of the interruption test T (S16).
If it is determined that there is an abnormality (No), the CPU 12 outputs an alarm (S6), and then turns off the power (S7).
If it is determined that there is no abnormality (Yes), the interruption test execution unit 14 turns off the test mode signal. Based on the fall of this OFF, the CPU 12 releases the axis interlock state by turning the servo-off signal OFF. Along with this, a process of returning the FIN of the program end macro is performed (S17).
Thereafter, returning to (S9), the timer 16 resets the integration, and newly counts the elapsed time from the time when the test mode signal is OFF.

<Time C (part 1) (see FIGS. 4 and 7)>
When the punch press 51 determines in (S11) that the elapsed time tk is a period Pc equal to or longer than the second elapsed time Tm2, the CPU 12 sends a shut-off test execution request signal to the output device 31 (ON). ), Outputting a test request message as an image or sound. If it is already output, the output is maintained (S18).
When the end macro of the machining program is read while the test request message is being output (program end macro signal ON) and the traverser operation completion response is returned (ON), the punch press 51 executes the shut-off test Tc. .
That is, it is determined that the machining is completed in the period Pc (S19: Yes), and at that time, the machining program end macro (G50, G10, M30, etc.) is read (program end macro signal ON), and a traverser operation completion response is returned. When turned on (ON), the CPU 12 turns on the servo-off signal to enter the axis interlock state.

  In response to the servo-off signal being turned on, the interruption test execution unit 14 turns on the test mode signal and executes the interruption test Tc in the period T3 (S20).

The interruption test execution unit 14 determines whether there is no abnormality as a result of the interruption test T (S21).
If it is determined that there is an abnormality (No), the CPU 12 outputs an alarm (S6), and then turns off the power (S7).
If it is determined that there is no abnormality (Yes), the interruption test execution unit 14 turns off the test mode signal. Based on the fall of this OFF, the CPU 12 releases the axis interlock state by turning the servo-off signal OFF. Along with this, a process of returning the FIN of the program end macro is performed (S22).
Further, the interruption test execution request signal is turned OFF, and the output of the test request message is stopped (S23).
Thereafter, returning to (S9), the timer 16 resets the integration, and newly counts the elapsed time from the time when the test mode signal is OFF.
Also in this case, the end of the machining program serves as a trigger for executing the interruption test (detection of contact welding presence / absence).

<Time C (part 2): When the interruption test is manually activated (see FIGS. 5, 7, and 8)>
The blocking test may be performed manually by the worker HB during the period Pc during which the test request message is output.
In this case, the procedure of (S18) to (S20) shown in FIG. 7 includes a determination (SA1) as to whether or not the protective device has been reset, as shown in FIG.

That is, the worker HB receives the fact that the second elapsed time Tm2 has elapsed and the test request message has been output in (S18), and presses the protective device reset button of the operation unit 23 to reset the protective device. Do with.
If the CPU 12 determines in (SA1) that the reset button has been pressed and turned on, it executes a blocking test (S20). That is, the servo-off signal is turned on to set the axis interlock state.
In response to the servo-off signal being turned on, as shown in FIG. 5, the interruption test execution unit 14 turns on the test mode signal and executes the interruption test Td in the period T4.
In this case as well, similarly to the period A, the resetting of the protective device becomes a trigger for executing the interruption test (detection of contact welding presence / absence).
The procedure after (S20) is the same as the procedure at time C (part 1) described with reference to FIG.

As described above, the punch press 51 is configured to execute the manual activation of the interruption test only when instructed during the period Pc.
Of course, the present invention is not limited to this, and it may be configured to execute even when the activation is instructed in another period Pa or period Pb.

<Time C (part 3): When the entry detection device 32 detects entry (see FIGS. 6, 7 and 9)>
In the period Pc, the punch press 51 automatically executes a shut-off test when the entry detection device 32 detects the entry of a person or an object.
For example, the procedure of (S18) to (S20) shown in FIG. 7 determines whether or not the approach detection device 32 has detected entry (whether or not a detection signal has been output), as shown in FIG. (SB1) is included.

  In other words, the entry detecting device 32 outputs a detection signal (ON) when detecting the entry of a person or an object into a predetermined section. If this output is made during the operation of the punch press 51, the safe operation executing unit 13 forcibly stops the operation.

If the output of the detection signal is during the output of the test request message output or maintained in (S18), that is, the second elapsed time has passed since the last shut-off test Ta ended, and the test When the request message is output during the period Pc (SB1: Yes), in addition to the forced operation stop by the safe operation executing unit 13, the CPU 12 turns on the servo-off signal to enter the axis interlock state. .
In response to the servo-off signal being turned ON, the interruption test execution unit 14 turns ON the test mode signal and executes the interruption test Te in the period T5 (S20).
As described above, the entry detection of the person or the object by the entry detection device 32 which is a safety device serves as a trigger for executing the interruption test (detection of presence / absence of contact welding).
The procedure after (S20) is the same as the procedure at time C (part 1) described with reference to FIG.

As described above in detail, the punch press 51 as a press working machine has a case where a program end macro is read as the final stage of the machining operation after a predetermined time (first elapsed time) has elapsed since the previous interruption test. In addition, a block test is automatically performed.
If there is an abnormality, an alarm is output and the power is turned off.
As a result, even when the punch press 51 is operated intermittently without turning off the power, or when the punch press 51 is continuously operated for a long period of time, a shut-off test is surely executed every time processing is completed, and there is an abnormality. When the operation is stopped, the power is turned off. Thereby, higher safety is ensured.

  In addition, when an entry detection device such as a light curtain is attached to the punch press 51, the operation of the punch press 51 is performed when entry is detected after a predetermined time (second elapsed time) has elapsed since the previous interruption test. In addition to automatically stopping, a shut-off test is also automatically executed, and a response is made according to the result.

Since the entry detection device detects entry but does not prevent entry, it is also possible for an operator HB or the like to approach the punch press 51 with the contacts of the electromagnetic switch welded. Therefore, the approach of the operator HB etc. in the situation where the punch press 51 does not stop even when the safety device is operated has been conventionally assumed.
On the other hand, in the punch press 51, the interruption test is automatically executed every time the entry detection device 32 detects the entry, and the result is judged.
Thereby, there is very little possibility of maintaining the contact for the electromagnetic switch for a long period of time.
In this way, in the punch press 51, the operation of the approach detection device and the interruption test operation can be effectively linked, so that higher safety is ensured.

  The CPU 12 outputs whether the interruption test is being executed, whether or not it has been executed, and the result of the execution from the output device 31 regardless of whether there is an abnormality.

  The embodiment of the present invention is not limited to the above-described configuration and procedure, and may be modified as long as it does not depart from the gist of the present invention.

The press working machine corresponds to one using a motor as a drive source for the press operation other than the punch press 51 described above.
The approach detection device is not limited to the light curtain, and various detection devices can be applied.
The first interruption test after power-on may be performed automatically.
The welding detection method by the contact welding detection device 6c is not limited, and various methods can be applied.
The contact welding detection device 6 c is not limited to the one provided in the electromagnetic switch 6, and may be arranged on a circuit between the power supply device 41 and the servo motor 2.

The second elapsed time Tm2 may be set corresponding to the worker's work cycle.
Normally, the work cycle is changed daily, so it is reasonable to set it to 24 hours. However, if the work cycle is in units of two days, it may be set to 48 hours.
The first elapsed time Tm1 is set as a time when welding does not substantially occur even when the contact is continuously conducted or a time sufficiently shorter than that time. Thereby, the operating efficiency of a press machine improves.
In addition, when the second elapsed time Tm2 is intentionally set to be short, the first elapsed time Tm1 and the second elapsed time Tm2 may be set to the same time. In this case, period Pa = period Pb.

  The number of servo motors included in the press machine is not limited to three as exemplified in the punch press 51 described above. You may have one, or four or more. The contact welding detection test execution method of the present invention is applied to at least one of electromagnetic switches attached to one or a plurality of servo motors of a press machine.

1 Press device, 1U, 1UA, 1UB Servo motor unit 2, 2A, 2B Servo motor, 3, 3A, 3B Servo amplifier 4, 4A, 4B Circuit section, 5, 5A, 5B encoder 6, 6A, 6B Electromagnetic switch 6a Thermal relay, 6b Magnetic contactor, 6c Contact welding detection device 11 NC device, 12 Central processing unit (CPU)
DESCRIPTION OF SYMBOLS 13 Safe operation execution part, 14 Blocking test execution part, 15 Memory | storage part 16 Timer, 17 PMC ladder 21 Input device, 22 Communication part, 23 Operation part, 31 Output device 32 Entry detection device (light curtain), 41 Power supply device 51 Punch Press, 61 Server FL Machining condition file HB Worker HB
J1 position information, J2 time information, J3 data J4 entry detection information, PG machining program T, Ta to Te block test, Tae time Tm1 first elapsed time, Tm2 second elapsed time

Claims (5)

A motor as a drive source for the press operation;
An electromagnetic switch provided in a circuit for supplying power to the motor;
Detects the contact welding presence of the electromagnetic switch, after detecting the execution of the contact welding existence of previous trigger that the end of the machining program for performing the press operation before the elapse of the first predetermined time set in advance when produced it does not perform the detection of the contact welding presence again, after detecting the execution of the contact welding existence of previous, when the trigger in a period after the first predetermined time has elapsed occurs and contact welding detecting device performs the detection of the contact welding presence again,
A press machine characterized by comprising. A motor as a drive source for the press operation;
An electromagnetic switch provided in a circuit for supplying power to the motor;
A safety device for detecting the approach of a person or object;
Detects the contact welding presence of the electromagnetic switch, after detecting the execution of the contact welding existence of previous trigger that approach detection of human Further objects by the safety device before the lapse of the first predetermined time set in advance If the without performing detection of the contact welding presence again if occurs, after detecting the execution of the contact welding absence of previous the trigger in a period after the first predetermined time has elapsed has occurred and contact welding detecting device performs the detection of the contact welding whether again,
A press machine characterized by comprising. After detecting the execution of the contact welding existence of previous, when passed a second predetermined time set in advance rather long than the first predetermined time without the trigger occurs, the detection execution of the contact welding presence The press machine according to claim 1 or 2 , wherein a prompting message is output. A method for performing a contact welding detection test of an electromagnetic switch in a press machine for executing a contact welding detection test of an electromagnetic switch provided in the press machine,
If after the end of the last of the contact welding detection test, before the lapse of the first predetermined time set in advance, the trigger that approaching detected is human or an object by the processing program is completed or safety device has occurred without performing the contact welding detection test again, after completion of the last of the contact welding detection test, the contact welding detection test when the trigger has occurred in the period after the first predetermined time has elapsed The method for executing a contact welding detection test of an electromagnetic switch in a press machine, wherein the test is executed again. After completion of the last of the contact welding detection test, when passed a second predetermined time set in advance rather long than the trigger a predetermined time Ku before Symbol first thing that occurs, the contact welding detection test 5. A method for performing a contact welding detection test of an electromagnetic switch in a press machine according to claim 4, wherein a message prompting execution is output.

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