JP5455524B2 - Inspection apparatus and inspection method - Google Patents

Description

  The present invention relates to a technique for inspecting inspection means in a press molding die provided with detection means therein, wiring thereof, and the like.

In order to prevent breakage of the press mold during press molding, there is a press mold provided with a sensor constituted by an electrical switch as means for detecting abnormality of the mold and abnormality of press molding.
Here, the sensor constituted by an electrical switch has a function of electrically checking that the press molding is properly performed.

At the stage of manufacturing such a conventional press mold, an electrical switch wiring that acts as a detecting means is provided in the manufactured press mold.
In other words, the above-described conventional mold for press molding is a so-called “mold assembly”, not only a mold but also a sensor constituted by an electrical switch, a cable connected to the sensor, and the cable. It is manufactured in a state including a connector or an outlet connected to the.

In a conventional press-molding die equipped with such sensors, cables, and outlets, it is necessary to check for disconnection inside the die, wiring mistakes, and the like.
However, a dedicated device for checking the disconnection inside the mold, a wiring mistake, etc. has not been proposed at the present time.

  Conventionally, a so-called tester has been used to check for disconnection in the mold as described above, wiring errors, and the like. That is, a tester checks whether or not current is flowing, and thus checks whether or not electrical connection (for example, a limit switch) constituting the sensor is conducted to a connector or an outlet. .

Here, in recent years, a contactless sensor (switch) such as a proximity sensor (proximity switch) has become the mainstream as an abnormality detection means in a press mold.
If a tester is used, it is possible to check whether there is a disconnection or a wiring mistake in a circuit including an electrical switch such as a limit switch.
However, for non-contact type sensors (switches) such as proximity sensors that do not have physical contacts, the conventional technology using a tester checks for disconnection from the proximity sensor to the connector or outlet and for wiring errors. I can't do it.
This is because in the tester as described above, the continuity to the connector (outlet) cannot be confirmed unless the probe (probe) is in contact with the physical contact.

For this reason, conventionally, on the side where a press mold is manufactured (die manufacturer side), an electric circuit including a sensor (for example, a proximity sensor) and a connector (outlet) having no physical contact is disconnected. It was difficult to check for wiring errors.
In other words, conventionally, a sensor that does not have a physical contact, such as a proximity sensor, is functioning properly unless it is a side that performs actual press work using a press die (orderer side). I could not confirm.

As another conventional technique, a press machine having a sensor for detecting the presence or absence of a residue on a die is provided in order to prevent disconnection of a wiring portion in a sensor for detecting a residue of a mold (see Patent Document 1). .
However, the related art (Patent Document 1) checks only the disconnection of the wiring portion of the sensor for detecting the residual matter, and checks for damage to the multiple types of sensors in the mold, disconnection of the sensor wiring, and the like. Cannot be solved, and the above-mentioned problems of the prior art cannot be solved.

JP 2003-62626 A

  The present invention has been proposed in view of the above-described problems of the prior art, and it is possible to easily and reliably determine whether there is an abnormality in an electric circuit in a mold having a contactless detection means. The purpose is to provide a possible inspection device and inspection method.

  The inspection apparatus of the present invention is connected to a probe (probe 2) that can contact a press molding die (10), and a power supply device (an outlet 7 that can be connected to a commercial power supply, a battery 7A, and a DC / AC converter 7B). The light quantity changes corresponding to the detection signal output of the contactless detection means (proximity switches 13A, 13B) (the light emitted from the proximity switch increases as the output from the proximity switch increases). For example, it has an LED lamp 6), a probe (2), a power supply device (7, 7A, 7B), and a light-emitting device (6) connected to a lead wire (4) constituting an electric circuit. If the circuit (L3a, L3b) is abnormal (for example, disconnection, wiring mistake), the light emitting device (6) does not emit light even if the probe (2) contacts the contact of the outlet (14c), The contactless detection means (13A, 3B), if there is an abnormality (for example, a failure), even if the detection signal output of the detection means (13A, 13B) increases (for example, the iron piece 9 approaches the proximity sensors 13A, 13B) And a function that does not change the light quantity of the light-emitting device (6), and when the contactless detection means (13A, 13B) is normal, the detection signal output from the detection means (13A, 13B) It is characterized in that the light quantity of the light emitting device changes.

The inspection method of the present invention performed using the above-described inspection apparatus (inspection apparatus according to claim 1) includes a plurality of the non-contact detection means (proximity switch 13A, 13B or proximity sensor) and the outlet (14c). And a probe (probe 2) of the inspection apparatus (inspection apparatus 1 according to any one of claims 1 and 2) on a press-molding die (10) having a plurality of electric circuits (L13a, L3b). A probe contacting step (S2) for contacting
When the light emitting device (for example, LED lamp 6) in the inspection device (inspection device 1 of claim 1) does not emit light in the probe contact step (S2), the electric circuit (L3a, L3b in the mold (10)) ) Is abnormal (for example, disconnection, wiring mistake) (S9), the operating state of the non-contact detection means (13A, 13B) is reproduced, and the detection signal of the detection means (13A, 13B) When the light quantity of the light emitting device (for example, the LED lamp 6) changes corresponding to the output, it is determined that the electric circuit (L3a, L3b) in the mold (10) is normal (S8) electric circuit determination step (S8, S9),
It is characterized by having.

In addition, in the inspection method of the present invention,
When it is determined in the disconnection determination step (S8, S9) that there is no disconnection (S8), one detection means (13A) from the plurality of non-contact detection means (proximity switches 13A, 13B or proximity sensors). ), And a detection signal output increasing operation step (S6) for performing an operation of increasing the detection signal output of the selected detection means (13A) (for example, an operation of bringing the iron piece 9 close to the proximity switch 13A);
In the detection signal output increasing operation step (S6), if the light amount of the light emitting device (for example, the LED lamp 6 (13)) does not increase, the selected detection unit (13A) has an abnormality (for example, the detection unit 13A has If the light quantity of the light emitting device (for example, the LED lamp 6) increases, it is determined that the selected detection means (13A) is normal (S8). Process (S8, S9),
It is preferable to have.

  According to the present invention having the above-described configuration, a plurality of detection means (proximity switches 13A, 13B or proximity sensors) having no physical contact, the detection means (13A, 13B), and the outlet (14c) For a press molding die (10) having a plurality of electrical circuits (L3a, L3b) for connecting the wire, check for disconnection inside the die (10), wiring errors, and failure of the detection means itself. A dedicated device (1) is provided.

In the present invention, an electrical circuit in the mold (10) is obtained by contacting a probe (probe 2) with the outlet (14c) and checking whether or not a light emitting device (for example, the LED lamp 6) emits light. It is possible to easily and reliably determine whether there is an abnormality in (L3a, L3b).
When there is no abnormality in the electric circuit (L3a, L3b), one detection means (13A) is selected from a plurality of detection means (proximity switches 13A, 13B or proximity sensors) having no physical contact, The operation of increasing the detection signal output of the detection means (13A) is performed (for example, the operation of bringing the iron piece 9 close to the proximity switch 13A), thereby increasing the light quantity of the light emitting device (for example, the LED lamp 6). By checking whether or not, it is possible to easily and reliably determine whether or not the selected detection means (detection means 13A having no physical contact) is normal.

As described above, according to the present invention, the dedicated device (1) can easily and reliably check the disconnection, wiring mistake, and the like inside the mold (10) described above.
The conventional tester method cannot check the structure related to the detection means (proximity switch 13A, 13B or proximity sensor) that does not have a physical contact point. Even detection means (proximity switches 13A, 13B or proximity sensor) that do not have a simple contact, or detection means (for example, an electrical switch such as limit switch 11, 12) that has a physical contact It is possible to easily and reliably check whether or not it is normal.

It is a block diagram which shows the metal mold | die for press molding to which this invention is applied, and the inspection apparatus which concerns on 1st Embodiment. It is explanatory drawing of the inspection apparatus which concerns on 1st Embodiment. It is a flowchart which shows the procedure of the inspection method which concerns on 1st Embodiment. In 1st Embodiment, it is explanatory drawing when there is no abnormality in wiring. In 1st Embodiment, it is explanatory drawing when there is no abnormality in a proximity sensor. It is explanatory drawing of the inspection apparatus which concerns on 2nd Embodiment. It is explanatory drawing of the inspection apparatus which concerns on 3rd Embodiment.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
First, with reference to FIG. 1, a press molding die apparatus to be inspected according to the illustrated embodiment will be described.
In FIG. 1, a press mold apparatus (for example, a male mold, hereinafter referred to as “mold”) 10 to which an embodiment of the present invention is applied has a work (steel plate) 30 already pressed on a molding surface. The state is shown.

In the mold 10, an air cylinder 20 for discharging the workpiece 30 is provided on the upper right side (work loading side) in FIG. 1. The work 30 is pressed and discharged at the tip of the push rod 21 of the air cylinder 20 in the direction of arrow F (work discharge side).
A first limit switch 11 for confirming the position of the push rod 21 is disposed in the vicinity of the push rod 21 on the work loading side. The first limit switch 11 checks whether there is a trouble that the push rod 21 does not return to the original position due to, for example, leakage in the compressed air supply system to the air cylinder 20.
A second limit switch 12 for confirming that the work 30 has been discharged is disposed on the surface 10f on the work discharge side of the mold 10.

On the work discharge side surface 10f, a notch 10a for sensor placement is provided in the vicinity of the left corner in FIG. A contactless sensor 13A (for example, a proximity sensor) is installed in the notch 10a.
In the mold 10, a notch portion 10 b for sensor arrangement is provided in the vicinity of the carry-in corner (upper right corner in FIG. 1) of the side portion 10 r (right side in FIG. 1). Also in the notch 10b, a non-contact sensor 13B (for example, a proximity sensor) is provided.
The non-contact sensors 13A and 13B are both provided to detect whether or not the work (material) 30 is placed at a specified position.

In the mold 10, a storage space 10c is formed in the vicinity of the carry-out side (lower right side in FIG. 1) of the right side portion 10r. The storage space 10c accommodates an electrical wiring connection device (hereinafter referred to as “connector” or “outlet”) 14.
The outlet 14c (configuration of the connector 14) of the storage space 10c is provided to electrically connect a press machine body (not shown) to the mold 10.
The outlet 14c is connected to the first limit switch 11 by a wire L1, and is connected to the second limit switch 12 by a wire L2.
Further, the outlet 14c is connected to the non-contact sensor 13A by a wire L3a, and is connected to the non-contact sensor 13B by a wire L3b.

In FIG. 1, FIG. 4, and FIG. 5, there are seven pin inserts (insertion holes for the mating terminal) of the outlet 14c, but the number of pin inserts of the outlet 14c is not limited to seven.
For example, a number (not shown) or the like is displayed on each pin insert, and the number or the like (not shown) is associated with a connection target (a limit switch or a contactless sensor). That is, it is configured so that it can be visually grasped which sensor is a pin insert related to an electric circuit by a number or the like (not shown).

Reference numeral 1 in FIG. 1 indicates the inspection apparatus according to the first embodiment.
Details of the inspection apparatus 1 according to the first embodiment will be described below with reference to FIG.

2, an inspection apparatus 1 according to the first embodiment includes a connection terminal (hereinafter referred to as “probe”) 2, an insulator 3, a wire 4, a 100 V outlet 5 (power supply apparatus), an LED lamp 6 (light emitting apparatus). )have.
The probe 2 is a comprehensive expression in the pair of probes 2a and 2b.
The insulator 3 includes an insulator 3a that insulates the probe 2a and an insulator 3b that insulates the probe 2a.
The wire 4 includes a wire 4a, a wire 4b, and a wire 4c. The wire 4a connects the probe 2a and a 100V outlet. The wire 4b connects the probe 2b and the LED lamp 6. The wire 4c connects the LED lamp 6 and a 100V outlet.
Here, in the inspection apparatus 1 according to the first embodiment, a 100V outlet is connected to, for example, a commercial power supply (AC power supply) of 100V (or 200V).

Based on the flowchart of FIG. 3, an inspection method using the inspection apparatus 1 of the first embodiment will be described with reference to FIGS. 4 and 5.
In step S <b> 1 of FIG. 3, the 100 V outlet 5 of the inspection apparatus 1 is plugged into the power source 7. Then, the process proceeds to step S2, and as shown in FIG. 4, the pin insert to be inspected of the outlet 14c of the mold 10 (for example, the pin insert corresponding to the electric circuit having the contactless sensor 13A and the wire L3a) is inspected. The probes 2a and 2b of the apparatus 1 are inserted.
Then, the process proceeds to step S3.

In the next step S3, the inspection worker checks whether or not the LED lamp 6 is lit.
If the LED lamp 6 is lit with normal luminance (step S3 is YES: state of FIG. 4), it is determined that the electric circuit is not disconnected, and the process proceeds to step S6.
On the other hand, when the LED lamp 6 is not lit (NO in step S3), the process proceeds to step S5, and it is determined that the electric circuit is disconnected.

In step S6 (when the LED lamp 6 is lit with normal brightness: YES in step S3), a magnetic material (for example, iron piece) 9 different from the work 30 is contacted with a non-contact sensor ( For example, the operating state of the sensor 13A is reproduced close to the proximity sensor 13A). In step S7, it is determined whether the LED lamp 6 emits light strongly.
If the LED lamp 6 emits light strongly (step S7 is YES, the state of FIG. 5), it is determined that the non-contact sensor (for example, the proximity sensor 13A) in the inspection target is normal (step S8).
Here, when the non-contact type sensor 13A is normal, the LED lamp 6 emits light so that the non-contact type sensor 13A generates a detection signal corresponding to a change in capacitance, for example. This is because the capacitance is greatly changed when the iron piece 9 is brought closer, and a stronger detection signal current is generated.
Therefore, even if the iron piece 9 is brought closer, if the LED lamp 6 does not emit light strongly as compared with the state of “YES” in step S3 (NO in step S7), a contactless sensor (for example, proximity sensor 13A). Is determined to be abnormal (step S9).

  The inspection method shown in FIG. 3 is also applicable to the contact type limit switches 11 and 12. In the inspection of the limit switches 11 and 12, since the detection signal does not fluctuate even if the iron piece 9 is brought close, the steps from S6 to S9 are not executed.

  According to the illustrated first embodiment, an electric circuit (for example, an electric circuit having a wire L3a that connects the contactless sensor 13A and the outlet 14c, or a wire that connects the contactless sensor 13B and the outlet 14c). In the press molding die 10 having an electric circuit having L3b, etc., the inside of the die 10 is broken, the wiring is incorrect, the contactless sensors 13A and 13B, and the limit switches 11 and 12 themselves are broken. Can be checked.

According to the first embodiment, the electrical circuit L1, L2, L3a, and L3b in the mold 10 are connected to each other by contacting the probe 2 with the outlet 14c and checking whether the LED lamp 6 of the inspection apparatus 1 emits light. It is possible to easily and reliably determine whether or not there is a disconnection or other abnormality.
When there is no abnormality such as disconnection in the electric circuits L1, L2, L3a, and L3b, one sensor (for example, 13A) is selected from the non-contact sensors 13A and 13B, and the iron piece 9 is attached to the selected sensor 13A. It is possible to easily and surely determine whether or not the selected sensor 13A is normal by performing an operation of making it approach and checking whether or not the light quantity of the LED lamp 6 has increased.

  In other words, the conventional tester method cannot check the structure related to the non-contact type sensor, but according to the first embodiment, even if the non-contact type sensor is used, Even if it is an electrical switch such as limit switches 11 and 12 having simple contacts, it can be easily and reliably checked whether or not it is normal.

In the inspection apparatus 1 of the first embodiment, the power source is a commercial power source (AC power source) of 100V.
On the other hand, the second embodiment of FIG. 6 and the third embodiment of FIG. 7 are different from the first embodiment in the type of power supply.
In FIG. 6, the inspection apparatus 1A according to the second embodiment uses a 24V battery 7A as a power source. The 24V battery 7A can be the same as that mounted on a large automobile.
Other configurations and operational effects in the second embodiment in FIG. 6 are the same as those in the first embodiment.

The inspection apparatus 1B according to the third embodiment shown in FIG. 7 has a 24V battery 7A as in the second embodiment, but a small AC between the wire 4 and the 24V battery 7A (power source). -The DC converter 7B is relayed.
The inspection apparatus 1B shown in FIG. 7 takes into account that the press machine (die) is operated with an AC power supply in the factory.
Configurations and operational effects other than those described above in the third embodiment in FIG. 7 are the same as those in the first embodiment and the second embodiment.

  The illustrated embodiment is merely an example, and is not intended to limit the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1, 1A, 1B ... Inspection apparatus 2 ... Deep needle / probe 3 ... Insulator / insulator 4 ... Wire 5 ... 100V outlet 6 ... LED lamp 7 ... Power supply ( 100V AC)
9 ... Iron piece 10 ... Die 11, 12 ... Limit switch 13A, 13B ... Non-contact sensor 14c ... Connector 20 ... Air cylinder 30 ... Workpiece

Claims (3)

Connects a probe that can contact a press mold, a power supply, a light-emitting device whose light intensity changes in response to the detection signal output of a contactless detection means, and the probe, power supply, and light-emitting device If there is an abnormality in the electrical circuit, the light emitting device does not emit light even if the probe contacts the outlet contact, and the contactless detection If there is an abnormality in the means, the light quantity of the light emitting device does not change even if the detection signal output of the detection means increases. When the non-contact detection means is normal, the detection signal of the detection means An inspection apparatus, wherein the light quantity of the light emitting device changes corresponding to the output. 2. The inspection method performed using the inspection apparatus according to claim 1, wherein the probe of the inspection apparatus is attached to a press mold having a plurality of electric circuits connecting the plurality of contactless detection means and the outlet. If the light emitting device in the inspection apparatus does not emit light in the probe contact step and the probe contact step, the electrical circuit in the mold is determined to be abnormal, and the contactless detection means is operated. An electrical circuit determining step that reproduces the state and determines that the electrical circuit in the mold is normal when the light amount of the light emitting device changes in response to the detection signal output of the detection means. Inspection method to do. A detection signal for performing an operation of selecting one detection means from the plurality of contactless detection means and increasing the detection signal output of the selected detection means when it is determined that the disconnection determination process is not disconnected In the output increase operation step and the detection signal output increase operation step, if the light amount of the light emitting device does not increase, it is determined that there is an abnormality in the selected detection means, and is selected if the light amount of the light emitting device increases. The inspection method according to claim 2, further comprising a detection means determination step for determining that the detection means is normal.

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