JP2018155539A - Determination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique disclosed in the specification of the present application which relates to properly determining a quality of the peeled state of an insulating electric wire.SOLUTION: A determination device disclosed in the specification of the present application includes: an imaging unit (22) for imaging, in succession, peeled end parts of an insulating cover (14) of an insulating electric wire (10) having a core wire (12) and the insulating cover (14) for covering the core wire (12); a state acquisition unit (36) for acquiring a state value showing a peeled state of the insulating cover (14) in end parts of the insulating electric wire (10) based on imaging data of the insulating electric wire (10) imaged by the imaging unit (22); a reference calculation unit (37) for calculating a determination reference based on a plurality of state values acquired in succession by the state acquisition unit (36); and a determination unit (38) for determining a quality of a newly acquired state value based on the determination reference.SELECTED DRAWING: Figure 3

Description

  The technique disclosed in the present specification relates to a technique for determining a peeled state of an insulating coating, for example.

  One of the methods for inspecting the state of an insulated wire is a method of performing the inspection by imaging a portion to be inspected of the insulated wire and analyzing the obtained imaging data.

  For example, regarding the stripping state of the insulation coating at the end of the insulated wire, it is inspected whether the position of the core wire exposed at the stripped part, the length of the core wire, the thickness of the core wire, etc. are appropriate Is done.

  For example, in the case exemplified in Patent Document 1 (Japanese Patent Application Laid-Open No. 2014-134409), a skinned portion of an insulated wire that moves at high speed is imaged with a two-dimensional CCD sensor, and the obtained imaging data is subjected to image analysis. By doing so, a skin peeling defect is detected.

JP 2014-134409 A

  When inspecting the skinned state of the insulation coating at the end of the insulated wire, a reference value for determining the quality of the skinned state is required. Conventionally, the reference value is measured by image analysis using imaging data randomly selected from a plurality of imaging data of the insulated wires imaged in advance.

  And whether the value measured from the imaged data of the newly-insulated insulated wire is within the range obtained by adding the tolerance to the above-mentioned reference value determines the quality of the insulated wire. .

  Therefore, when the reference value measured from the above-mentioned randomly selected imaging data is greatly deviated from the actual variation range of good products, there is a problem that the quality of the peeled state of the insulated wires is not properly determined. there were.

  The technology disclosed in the present specification has been made to solve the problems described above, and relates to a technology for appropriately determining the quality of a peeled state of an insulated wire.

  According to a first aspect of the technology disclosed in the specification of the present application, an imaging unit that sequentially images an end portion of an insulated wire that includes a core wire and an insulating coating that covers the core wire and the insulating coating is peeled off; and Based on imaging data of the insulated wire imaged by the imaging unit, a state acquisition unit that acquires a state value indicating a peeled state of the insulating coating at an end of the insulated wire, and a state acquisition unit sequentially acquired A reference calculation unit that calculates a determination criterion based on the plurality of state values, and a determination unit that determines whether the state value newly acquired is acceptable based on the determination criterion.

  Further, a second aspect of the technology disclosed in the specification of the present application relates to the first aspect, and the reference calculation unit obtains a predetermined number of times before the state value obtained last. The determination criterion is calculated based on the obtained state value.

  Further, a third aspect of the technology disclosed in the specification of the present application is related to the first aspect or the second aspect, and the state acquisition unit is exposed at the end of the insulated wire as the state value. The thickness of the root portion of the core wire that is exposed, the maximum thickness of the exposed core wire, the boundary position between the exposed core wire and the insulation coating, and the length of the exposed core wire in the longitudinal direction Measure at least one of the parameters.

  Further, a fourth aspect of the technology disclosed in the specification of the present application is related to any one of the first aspect to the third aspect, and the reference calculation unit is configured such that the variation in the state value is normal. The determination criterion is calculated on the assumption that the distribution follows.

  Further, a fifth aspect of the technology disclosed in the specification of the present application relates to any one of the first to fourth aspects, and the reference calculation unit has the state value of the first state. When out of the range, the determination criterion is calculated by removing the state value.

  Further, a sixth aspect of the technology disclosed in the specification of the present application is related to any one of the first aspect to the fifth aspect, and the determination device further includes a second determination criterion. An informing unit for informing when the range is exceeded is provided.

  According to the first aspect of the technology disclosed in the specification of the present application, it is possible to appropriately determine the quality of the peeled state of the insulated wire.

  In particular, according to the second aspect, the determination criterion can be calculated based on the most recently obtained state value.

  In particular, according to the 3rd aspect, the quality of the peeling state in the edge part of an insulated wire can be determined based on a measured value.

  In particular, according to the fourth aspect, for example, the case where the state value is included in the range of the standard deviation 3σ can be determined to be the case where the peeled state at the end of the insulated wire is in a good state.

  In particular, according to the fifth aspect, even when the measured state value deviates greatly from the actual variation range of non-defective products, the determination criterion can be maintained at an appropriate value.

  In particular, according to the sixth aspect, it is possible to recognize by notification that the criterion has changed. Then, by referring to the transition of the judgment standard, it is possible to monitor the change over time of the entire mechanism.

  The objectives, features, aspects, and advantages of the technology disclosed in this specification will become more apparent from the detailed description and the accompanying drawings provided below.

It is a figure which illustrates the structure of the insulated wire regarding embodiment. It is a figure which illustrates schematically the hardware constitutions for implement | achieving the determination apparatus regarding this Embodiment. It is a functional block diagram implement | achieved in the determination process part. It is a figure which illustrates the imaging data of the insulated wire imaged by the imaging part regarding this Embodiment. It is a flowchart which illustrates operation | movement of the determination apparatus regarding this Embodiment.

  Embodiments will be described below with reference to the accompanying drawings.

  Note that the drawings are schematically shown, and the configuration is omitted or simplified as appropriate for the convenience of explanation. In addition, the mutual relationships between the sizes and positions of the configurations and the like shown in different drawings are not necessarily accurately described and can be changed as appropriate.

  Moreover, in the description shown below, the same code | symbol is attached | subjected and shown in the same component, and it is the same also about those names and functions. Therefore, detailed descriptions thereof may be omitted to avoid duplication.

  In addition, in the description described below, even if an ordinal number such as “first” or “second” is used, these terms mean that the contents of the embodiment are understood. It is used for the sake of convenience, and is not limited to the order that can be generated by these ordinal numbers.

<Embodiment>
Hereinafter, the determination apparatus according to the present embodiment will be described. For convenience of explanation, first, an insulated wire that is a determination target will be described.

<About the configuration of insulated wires>
FIG. 1 is a diagram illustrating the configuration of an insulated wire. As illustrated in FIG. 1, the insulated wire 10 includes a core wire 12 and an insulating coating 14 that covers the core wire 12.

  The core wire 12 is a wire material whose main component is a metal such as copper or aluminum. As illustrated in FIG. 1, a plurality of core wires 12 may be bundled and covered with an insulating coating 14, or one core wire 12 may be covered with an insulating coating 14.

  The insulating coating 14 is a synthetic resin member whose main component is, for example, polyethylene, vinyl chloride, or polyamide-based nylon.

  In the insulated wire 10 illustrated in FIG. 1, the insulation coating 14 is peeled off at the end of the insulated wire 10, and the core wire 12 is exposed at the portion.

<Hardware configuration of determination device>
Next, the determination apparatus according to this embodiment will be described. FIG. 2 is a diagram schematically illustrating a hardware configuration for realizing the determination device according to the present embodiment. As illustrated in FIG. 2, the determination device includes an imaging unit 22 and a determination processing unit 24.

  The imaging unit 22 images the end of the insulated wire 10. The imaging unit 22 can be composed of, for example, a two-dimensional image sensor and an imaging lens.

  The determination processing unit 24 determines the skinned state at the end of the insulated wire 10 by analyzing the imaging data of the insulated wire 10 captured by the imaging unit 22. The determination processing unit 24 includes, for example, a central processing unit (CPU) 201, a read only memory (ie, ROM) 202, and a random access memory (ie, RAM) 203. The communication unit 204, the storage device 205, and the like are configured by a general computer interconnected via a bus line 206.

  The ROM 202 stores basic programs and the like, and the RAM 203 is used as a work area when the CPU 201 performs predetermined processing. The communication unit 204 has a data communication function via a communication line such as a LAN.

  The storage device 205 is, for example, a hard disk drive (ie, HDD), flash memory, erasable programmable read only memory (EPROM), and an electrically erasable programmable non-volatile (EEPROM) or an volatile (EEPROM). Any storage medium such as a memory (storage medium) including a memory (storage medium) including a memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, or a DVD may be applicable.

  The storage device 205 stores a program 300, and is configured such that various functions of the determination device are realized when the CPU 201 as the main control unit performs arithmetic processing according to the procedure described in the program 300. ing.

  The program 300 is usually used by being previously stored in a memory such as the storage device 205, but is provided in a form recorded on a recording medium such as a CD-ROM or DVD-ROM, an external flash memory, It may be stored in a memory such as the storage device 205 in addition or exchange. However, some or all of the functions realized in the determination processing unit 24 may be realized in hardware by a dedicated logic circuit or the like.

  An input device 28 and a display device 26 are further connected to the determination processing unit 24. The input device 28 is an input device including at least one of, for example, a keyboard, a mouse, various switches, and a touch panel, and accepts various operations (operations such as inputting commands or various data) from the operator.

  The display device 26 includes a liquid crystal display device, a lamp, and the like, and displays various types of information under the control of the CPU 201.

<About the software configuration of the judgment device>
FIG. 3 is a functional block diagram realized in the determination processing unit. As illustrated in FIG. 3, the determination processing unit 24 includes an imaging control unit 32, a storage unit 34, a state acquisition unit 36, a reference calculation unit 37, and a determination unit 38. Each of these functional units is realized, for example, by the CPU 201 performing predetermined arithmetic processing according to the program 300 as described above.

  The imaging control unit 32 controls the imaging unit 22 to image the peeled end of the insulated wire 10. However, the insulated wire 10 is in a posture along the axis in which the longitudinal direction is determined, and the imaging unit 22 images the end of the insulated wire 10 arranged in such a posture. The imaging data acquired by the imaging unit 22 is displayed on the display device 26 under the control of the determination processing unit 24, for example.

  The storage unit 34 stores imaging data of the insulated wire 10 imaged by the imaging unit 22.

  The state acquisition unit 36 measures a state value that is a value indicating the peeled state at the end of the insulated wire 10. The reference calculation unit 37 calculates the state value variation range measured by the state acquisition unit 36 as a determination criterion. Specific operations will be described later. Both the state value measured by the state acquisition unit 36 and the variation range of the state value calculated by the reference calculation unit 37 can be stored in the storage unit 34.

  The determination unit 38 determines pass / fail of the newly obtained state value based on the variation range of the state value calculated by the reference calculation unit 37. And the determination part 38 determines the quality of the peeling state of the insulated wire 10 in the newly obtained imaging data based on the quality of a state value. A specific determination method will be described later.

<About operation of judgment device>
Next, the operation of the determination apparatus according to the present embodiment will be described with reference to FIGS. 4 and 5. FIG. 4 is a diagram illustrating imaging data of the insulated wire 10 imaged by the imaging unit 22. FIG. 5 is a flowchart illustrating the operation of the determination apparatus.

  First, the imaging control unit 32 controls the imaging unit 22 to image the end of the insulated wire 10 (see step ST601). The imaging is sequentially performed on the ends of different insulated wires 10. Next, the memory | storage part 34 memorize | stores sequentially the imaging data of the insulated wire 10 imaged by the imaging part 22 (refer step ST602).

  Next, the state acquisition unit 36 sequentially measures a value indicating a peeling state at the end of the insulated wire 10, that is, a state value, based on the imaging data stored in the storage unit 34 (see step ST603). . The state value can be sequentially stored in the storage unit 34.

  FIG. 4 is a diagram illustrating imaging data of the insulated wire 10 stored in the storage unit 34. The imaging data of the insulated wire 10 is a grayscale image, and is converted into binary data obtained by converting each pixel into a binary value of 0 and 1.

  The edge of the insulated wire 10, that is, the boundary position between the insulated wire 10 and the background, for example, when a threshold value is 150 in a grayscale image of 256 gradations, a portion of 150 or more is an image of 1 (white) Otherwise, it is converted to a 0 (black) image. Therefore, the state acquisition unit 36 can specify the edge of the insulated wire 10.

  And the state acquisition part 36 calculates the distance between edges specified for every strip | belt-shaped area | region along the Y direction divided by the dotted line in FIG.

  The state acquisition unit 36 can specify which position in the insulated wire 10 the band-like region corresponds to by referring to the inter-edge distance calculated for each belt-like region.

  Therefore, when the exposed core wire 12 is present at a position corresponding to a certain belt-like region, the distance between the edges of the belt-like region is a small value.

  Therefore, when the insulating coating 14 is present at a position corresponding to a certain band-like region, the distance between the edges of the band-like region is a large value.

  As described above, by referring to the distance between edges in each band-shaped region, it is determined whether the exposed core wire 12 is present at a position corresponding to the band-shaped region or the insulating coating 14 is present. Can be identified. Therefore, the state acquisition unit 36 can specify the boundary position between the portion where the core wire 12 is exposed and the portion covered by the insulating coating 14.

  FIG. 4 illustrates the skinning position 102, the skinning length 104, the overall thickness 106, and the root thickness 108 as values indicating the skinning state of the insulating coating 14.

  The skinning position 102 is a value indicating a boundary position between a portion where the core wire 12 is exposed and a portion covered by the insulating coating 14. The skinning length 104 is a value indicating the length in the X direction of the portion where the core wire 12 is exposed. The overall thickness 106 is a value indicating the maximum thickness in the Y direction of the portion where the core wire 12 is exposed. The root thickness 108 is a value indicating the thickness of the portion where the core wire 12 is exposed near the skinning position 102, that is, the thickness of the root portion of the core wire 12.

  As described above, based on the binarized data from the imaging data, it is possible to specify the edge of the insulated wire 10 and the boundary position between the portion where the core wire 12 is exposed and the portion covered by the insulating coating 14. Therefore, the state acquisition unit 36 can measure any of the above-described skinning position 102, skinning length 104, overall thickness 106, and root thickness 108.

  Next, the determination unit 38 determines whether or not the state value measured from the imaging data of the insulated wire 10 as described above is included in the variation range that is the determination criterion calculated in advance by the reference calculation unit 37. (Refer to step ST604).

  And when said state value is contained in the variation | variation range calculated beforehand by the reference | standard calculation part 37 (ie, when corresponding to "YES" branched from step ST604), the insulated wire from which the said state value was measured It is determined that the peeled state of 10 is a good state, and the process proceeds to step ST605.

  On the other hand, when the above state value is not included in the variation range calculated in advance by the reference calculation unit 37, that is, when it corresponds to “NO” branched from step ST604, the state value is measured. It is determined that the peeled state of the insulated wire 10 is in a bad state, and the process proceeds to step ST606.

  Next, the reference calculation unit 37 includes the above-described state values determined by the determination unit 38 based on a plurality of state values obtained a predetermined number before the last obtained state value. The state value variation range is calculated (see step ST607).

  Specifically, the reference calculation unit 37 calculates an assumed state value variation range, for example, a standard deviation 3σ range, assuming that the variation of the plurality of state values follows a normal distribution.

  Here, when calculating the variation range, state values that deviate from a predetermined numerical range in which state values corresponding to non-defective products are assumed to be distributed can be excluded.

  Until a certain number of state values are accumulated in the storage unit 34, the state value is measured based on one piece of randomly selected image data, or a value indicating the skinning state set by the user. On the other hand, what added the range of tolerance can be used as a variation range.

  On the other hand, after a certain number of imaging data is accumulated, the state values stored in the storage unit 34 are changed to state values obtained up to a predetermined number from the last obtained state value. Based on this, it is possible to calculate the state value variation range.

  The calculation of the variation range of the state value by the reference calculation unit 37 can be performed every time a new state value is obtained, but should be performed after a predetermined interval after the previous calculation of the variation range. Is also possible.

  In addition, when the calculated average value of the variation range is out of a predetermined numerical range, it can be notified. The notification can be realized by, for example, display on the display device 26 under the control of the CPU 201, signal output via the communication unit 204 under the control of the CPU 201, and the like by the determination processing unit 24 functioning as the notification unit.

  In the present embodiment, the state value variation range is calculated based on the state values obtained up to a predetermined number of times before the last obtained state value. The range may be calculated based on the obtained plurality of state values. Moreover, the variation range of the state value is not limited to the case based on the continuously obtained state value. For example, the state value obtained from the imaging data of the insulated wire 10 captured at a certain timing and a plurality of imaging data The variation range of the state value may be calculated based on the state value obtained from the imaging data of the insulated wire 10 imaged at the timing after the above is obtained.

<About the effects produced by the embodiment described above>
Next, effects produced by the embodiment described above will be exemplified. In the following description, the effect is described based on the specific configuration exemplified in the above-described embodiment, but is exemplified in the present specification within a range in which the same effect occurs. Other specific configurations may be substituted.

  According to the embodiment described above, the determination apparatus includes the imaging unit 22, the state acquisition unit 36, the reference calculation unit 37, and the determination unit 38. The imaging unit 22 sequentially images the end portions of the insulated wire 10 including the core wire 12 and the insulating coating 14 that covers the core wire 12 from which the insulating coating 14 has been peeled off. The state acquisition unit 36 acquires a state value that is a value indicating the peeled state of the insulating coating 14 at the end of the insulated wire 10 based on the imaging data of the insulated wire 10 imaged by the imaging unit 22. The reference calculation unit 37 calculates a determination criterion based on the plurality of state values sequentially acquired by the state acquisition unit 36. Here, the criterion is, for example, a state value variation range. The determination unit 38 determines pass / fail of the newly acquired state value based on the determination criterion.

  According to such a configuration, the quality of the peeled state of the insulated wire 10 can be appropriately determined. That is, when determining the quality of the stripped state of the insulated wire using a reference value based on randomly selected imaging data, it is appropriate that the above reference value is significantly different from the actual non-defective product variation range. Although the determination cannot be made, according to the determination apparatus according to the present embodiment, the determination criterion is calculated based on the sequentially acquired state values, and thus the determination criterion does not deviate significantly from the actual non-defective product variation range. Therefore, the quality of the peeled state of the insulated wire 10 can be determined appropriately.

  Other configurations exemplified in the present specification other than these configurations can be omitted as appropriate. That is, if at least these configurations are provided, the effects described above can be produced.

  However, when at least one of the other configurations exemplified in the present specification is appropriately added to the configuration described above, that is, the configuration described above is not exemplified as the configuration described above. Even when other configurations described above are added to the configurations described above, the effects described above can be similarly produced.

  Further, according to the embodiment described above, the reference calculation unit 37 calculates the determination criterion based on the state values obtained a predetermined number before the state value obtained last. To do. According to such a configuration, the determination criterion can be calculated based on the most recently obtained state value. In addition, the change with time of the entire mechanism can be monitored by referring to the transition of the determination criteria. Here, the entire mechanism includes a mechanism for performing a skinning operation, a mechanism for transferring for imaging, a mechanism for fixing the insulated wire 10 and the imaging unit 22, and an operation mechanism such as an imaging element inside the imaging unit 22. It is a mechanism including.

  Moreover, according to embodiment described above, the state acquisition part 36 has the root | tip thickness 108 of the core wire 12 exposed in the edge part of the insulated wire 10, and the exposed core wire 12 as a state value. The overall thickness 106 which is the maximum thickness, the peeling position 102 which is the boundary position between the exposed core wire 12 and the insulating coating 14, and the peeling length which is the length in the longitudinal direction of the exposed core wire 12 At least one of the lengths 104 is measured. According to such a configuration, the quality of the peeled state at the end of the insulated wire 10 can be determined based on these measured values.

  Further, according to the embodiment described above, the reference calculation unit 37 calculates the determination reference on the assumption that the variation of the state value follows a normal distribution. According to such a configuration, for example, the case where the state value is included in the range of the standard deviation 3σ can be regarded as the case where the peeled state at the end of the insulated wire 10 is in a good state.

  Further, according to the embodiment described above, when the state value is out of the first range, the reference calculation unit 37 calculates the determination criterion except for the state value. Here, the first range is a predetermined numerical range in which state values corresponding to non-defective products are assumed to be distributed. According to such a configuration, even if the measured state value is significantly out of the actual non-defective product variation range, the determination criterion can be maintained at an appropriate value.

  Moreover, according to embodiment described above, the determination apparatus is provided with the alerting | reporting part which alert | reports when a criterion is outside the 2nd range. Here, the notification unit is realized by the display on the display device 26 under the control of the CPU 201, the signal output via the communication unit 204 under the control of the CPU 201, and the like by the function of the determination processing unit 24. The second range is a predetermined numerical range in which state values corresponding to non-defective products are assumed to be distributed, but a range different from the first range can also be assumed. In addition, when the determination criterion is the state value variation range, for example, it is possible to make a notification depending on whether or not the average value of the state values is included in the second range. According to such a configuration, it is possible to recognize by notification that the determination criterion has changed. Then, by referring to the transition of the judgment standard, it is possible to monitor the change over time of the entire mechanism.

<Modifications in Embodiments Described above>
In the embodiment described above, the material, material, dimension, shape, relative arrangement relationship, or implementation condition of each component may be described, but these are examples in all aspects. Thus, it is not limited to those described in this specification.

  Accordingly, countless variations and equivalents not illustrated are envisioned within the scope of the technology disclosed in this specification. For example, the case where at least one component is modified, the case where it is added, or the case where it is omitted are included.

  In addition, as long as no contradiction arises, “one or more” components described as being provided with “one” in the embodiment described above may be provided.

  Further, each component in the embodiment described above is a conceptual unit, and one component is composed of a plurality of structures within the scope of the technique disclosed in this specification. In addition, a case where one component corresponds to a part of a structure and a case where a plurality of components are provided in one structure are included.

  In addition, each component in the embodiment described above includes structures having other structures or shapes as long as the same function is exhibited.

  Also, the descriptions in the present specification are referred to for all purposes related to the present technology, and none of them is admitted to be prior art.

  In addition, each component described in the above-described embodiment is assumed to be software or firmware or hardware corresponding thereto, and in both concepts, each component is a “part”. And so on.

  In addition, the technology disclosed in the present specification may be an aspect in which each component is distributed and provided in a plurality of devices, that is, a system-like aspect.

DESCRIPTION OF SYMBOLS 10 Insulated wire 12 Core wire 14 Insulation coating 22 Imaging part 24 Judgment processing part 26 Display apparatus 28 Input apparatus 32 Imaging control part 34 Memory | storage part 36 State acquisition part 37 Reference | standard calculation part 38 Judgment part 102 Skinning position 104 Skinning length 106 Whole Thickness 108 Root thickness 201 CPU
202 ROM
203 RAM
204 Communication unit 205 Storage device 206 Bus line 300 Program

Claims (6)

An imaging unit that sequentially images the end of the insulated wire provided with a core wire and an insulation coating that covers the core wire, and the insulation coating is peeled off;
Based on imaging data of the insulated wire imaged by the imaging unit, a state acquisition unit that obtains a state value indicating a skinned state of the insulating coating at the end of the insulated wire;
A reference calculation unit that calculates a determination criterion based on the plurality of state values sequentially acquired by the state acquisition unit;
A determination unit that determines the quality of the newly acquired state value based on the determination criterion;
Judgment device. The reference calculation unit calculates the determination criterion based on the state value obtained by a predetermined number of times before the state value obtained last.
The determination apparatus according to claim 1. The state acquisition unit, as the state value,
The thickness of the root portion of the core wire exposed at the end of the insulated wire, the maximum thickness of the exposed core wire, the exposed boundary position between the core wire and the insulating coating, and the exposed portion Measuring at least one of the longitudinal lengths of said core wires,
The determination apparatus according to claim 1 or 2. The reference calculation unit calculates the determination criterion on the assumption that the variation of the state value follows a normal distribution;
The determination apparatus according to any one of claims 1 to 3. When the state value is out of the first range, the reference calculation unit calculates the determination criterion except for the state value.
The determination apparatus according to any one of claims 1 to 4. The determination device further includes:
An informing unit for informing when the determination criterion is out of the second range;
The determination apparatus according to any one of claims 1 to 5.

Images