JP5113382B2 - Crimping tool inspection device - Google Patents

Description

  The present invention relates to a crimping tool inspection apparatus.

  Conventionally, manual crimping tools have been used to connect electrical wiring materials and crimp terminals for electrical connection. An example of such a manual crimping tool is illustrated in FIG. The different forms shown in FIGS. 1 (A) and 1 (B) are properly used depending on the size of the crimp terminal corresponding to the electric capacity of the electric wiring material.

  Basically, the operation of these manual crimping tools is common. The gripping force applied by gripping the handle 1 is converted into a crimping force applied to the die tip 2 by the action of the lever. As a result, the crimping terminal passing through the electrical wiring material positioned at the die tip 2 can be crimped and the electrical wiring material and the crimping terminal can be crimped and connected.

  FIG. 2 is a partially enlarged view showing a cross-section of the crimp terminal passing through the electric wiring material positioned in the gap formed between the die tip 2 and the die tip 2. The die tip portion 2 has a core wire portion die 21 and a covering portion die 22, and positions the crimping terminal 10 between the core wire portion die 21 and the covering portion die 22. Furthermore, the core wire portion 12 peeled off from the end portion of the covering portion 11 of the electrical wiring material is inserted into the crimp terminal 10 until it hits the stopper portion 13.

  In this state, when the handle 1 is grasped, the crimp terminal 10 is crushed by the upper and lower core wire dies 21 and the cover die 22, and the electrical wiring material and the crimp terminal 10 are crimped and connected.

  FIG. 3 shows a state in which the main body portion 10a of the crimp terminal 10 is crushed and the core wire portion 12 of the electrical wiring material is connected to the crimp terminal.

  Here, the complete connection between the crimp terminal 10 and the core wire portion 12 of the electric wiring material greatly affects the reliability of the electric equipment, electric equipment, and the like to which the electric wiring is applied.

  On the other hand, in the manual crimping tool illustrated in FIG. 1, the handle load changes due to long-term use, and the size of the gap formed between the upper and lower portions of the core wire die 21 and the covering die 22 changes. Becomes worse. As a result, a connection failure between the crimp terminal 10 and the core wire portion 12 of the electric wiring material may occur, and the reliability may be affected.

  Therefore, it is necessary to detect such a state early and adjust the manual crimping tool. Up to now, the determination as to whether or not the manual crimping tool has passed the standard has been made using a designated gauge, for example, as shown in FIG.

  That is, FIG. 4 is an enlarged view showing a die portion of the manual crimping tool. In this state, the handle 1 is held and the die tip 2 is brought into close contact. The limit plug gauge 4 has a GO gauge and a NO-GO gauge having different diameters at both ends. The GO gauge side and the NO-GO gauge side can be discriminated by the line 4a.

  The GO side gauge passes through the gap between the upper and lower core part dies 21 and the covering part die 22 formed with the die tip 2 in close contact, and the NO-GO side gauge does not pass. If the gauge does not pass, or if both the GO side gauge and the NO-GO side gauge pass, it is judged as rejected.

  FIG. 5 is a diagram showing a conceptual configuration of a crimping tool configured to pressurize the handle 1 of the manual crimping tool shown in FIG. 1 with air. In FIG. 5, 100 is a crimping machine main body of the crimping tool, and 110 is an air pressure plunger.

  The air pressure plunger 110 and the crimping machine main body 100 can be attached / detached, and the same pressure plunger 110 can be shared by a plurality of types of crimping machine main body 100.

  The pressure plunger 110 has a plunger that expands and contracts as the pressure increases and decreases, and can apply a crimping force to the die tip 2 by the lever action of the crimping machine main body 100 and the link mechanism.

  In contrast to the manual crimping tool shown in FIG. 1, the crimping tool shown in FIG. 5 is laid on the production line and is suitable for performing the crimping process by driving the pressure plunger 110 with air.

  The crimping tool shown in FIG. 5 also has the same problem of crimping due to aging as described for the manual crimping tool of FIG. Therefore, it is necessary to determine whether or not the crimping tool including the pressure plunger 11 shown in FIG.

On the other hand, there are techniques described in Patent Documents 1 and 2 as techniques for automating test apparatuses related to crimping tools. In either case, the crimped portion of the crimp terminal is photographed and the image is analyzed to determine the crimped state.
JP-A-11-101622 JP 2004-127790 A

  As described above, the technique for numerically measuring the crimping performance in the performance inspection of the die tip 2 of the manual crimping tool of FIG. 1 or the air crimping tool of FIG. 5 (hereinafter simply referred to as a crimping tool). However, the limit plug gauge 4 was used, and judgment was made by a sensory judgment by an expert.

  In this case, a crimping tool is prepared corresponding to the size of the crimping terminal 10, but the limit plug gauge 4 needs to be prepared corresponding to the crimping tool corresponding to the size of the crimping terminal 10.

  Further, since the state is judged by passing or not passing through the GO side gauge and NO-GO side gauge with the die tip 2 in close contact, in the case of a manual crimping tool, the tip of the die is determined by the grip pressure of the handle 1. The size of the gap in part 2 changes, which makes proper judgment difficult.

  For this reason, until now, tool inspections have been performed by skilled workers, and the measurement results have not been digitized as manual sensory inspections. As a result, when the skilled worker is not sufficiently secured, it is difficult to perform sufficient inspection, and as a result, the connection quality between the crimp terminal and the electric wiring material may vary or the quality may be deteriorated.

  As described above, there are a plurality of types of crimping tools. Accordingly, an object of the present invention is to provide a crimping tool inspection apparatus that can inspect a plurality of types of crimping tools and can obtain a uniform measurement result without requiring an expert.

  One aspect of the present invention that achieves the above object is a crimping tool inspection apparatus that crimps and connects a crimping terminal into which a connecting conductor is inserted between a pair of crimping blades.

  The inspection apparatus includes a contact arranged to move along one side surface of the pair of crimping blades of the crimping tool, a sensor for detecting the amount of movement of the contact, and a contact detected by the sensor. An amplifier unit is provided that obtains the size of the gap between the pair of crimping blades from the amount of movement and displays the obtained size of the gap between the pair of crimping blades.

  By displaying the size of the gap between the crimping blades, it is possible to accurately recognize the size of the gap between the crimping blades without depending on the sense of the inspector.

  Furthermore, in the said structure, the output value of the said sensor detected when the front-end | tip between a pair of said crimping | compression-bonding blades is closed is made into a reference value. Then, the amount of movement of the contact with respect to the reference value detected when a crimping terminal is inserted between the pair of crimping blades and the pair of crimping blades is closed again has a predetermined tolerance value. Whether or not the crimping tool having the pair of crimping blades is within the range can be determined.

  Further, in the above, the sensor includes a primary coil that generates a magnetic field, a core that is connected to the contactor and is inserted into the primary coil, and the primary coil that changes according to the amount of insertion of the core. This can be realized by a sensor having a secondary coil that detects a signal coil current corresponding to a change in impedance.

  Furthermore, in the relationship between the contact and the pair of pressure-bonding blades, a configuration in which the contact is in direct contact with one side surface of the pair of pressure-bonding blades is possible.

  As another aspect, the sensor lever supported by the fulcrum pin is provided. The contact is in contact with one end of the sensor lever on the basis of the fulcrum pin, and the other end of the sensor lever is in contact with one side surface of the pair of crimp blades. It is also possible to do.

  With the above features of the present invention, it is possible to determine whether or not the performance is acceptable only by checking the meter display and the presence / absence of the pass lamp without depending on the operator's sense of the performance of the crimping tool.

  In addition, it is possible to perform an inspection quickly corresponding to each of a plurality of types of crimping tools.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 6 is a diagram showing an embodiment of a crimping tool (die) inspection apparatus according to the present invention.

  In FIG. 6, FIG. 6A is a view showing a state plan view in which the sensor part of the inspection apparatus according to the present invention is attached to the crimping machine main body part 100 of the crimping tool. FIG. 6B is a view of FIG. 6A viewed from the right direction, and further shows a control box 42 of the inspection apparatus.

  In FIG. 6A, the die portion is configured by sequentially connecting the crimping die bracket 32 and the crimping blade 33 to the air crimping machine main body 100 via the die set pins 34.

  On the other hand, the sensor unit of the inspection apparatus has a sensor bracket 35 screwed to the air crimping machine main body 100, and a sensor holder 37 is provided on the sensor bracket 35 via a spacer 36.

  Further, a contact type digital sensor 39 having a contact 38 at the tip is held by the sensor holder 37.

  Here, the contact type digital sensor 39 has a magnetic field generating coil as a primary coil and a detection coil as a secondary coil. Furthermore, it has a core inserted in the magnetic field generating coil.

  As a principle operation, the insertion amount of the core inserted into the magnetic field generating coil is changed in a state where a predetermined level of signal current is passed through the magnetic field generating coil. The impedance of the coil changes depending on the amount of core insertion. Therefore, the detection current level detected by the detection coil which is a secondary coil changes correspondingly.

  Thereby, the insertion amount of the core, that is, the movement amount of the contact 38 can be obtained from the magnitude of the signal level detected by the detection coil.

  Returning to FIG. 6, the contact 38 of the contact type digital sensor 39 is connected to a core inserted into the contact type digital sensor 39. The contact 38 is positioned along the side surface of the pressure bonding blade 33.

  Therefore, the insertion amount of the core inserted into the contact type digital sensor 39 is maximized when the crimping blade 33 is open, and the insertion amount of the core is minimized when the crimp blade 33 is closed.

  From this operation, the detection current detected by the detection coil is input to the control box 42 through the sensor cable 41.

  In the control box 42, the state of the crimping tool can be inspected by comparing the detected current value when the crimping blade 33 input through the sensor cable 41 is closed with a predetermined reference value.

  The control box 42 has an amplifier unit 43, a reset button 44, and a power switch 45 on the front panel side.

  The signal processing in the control box 42 will be described later in detail again. In FIG. 6B, the determination signal LED 40 at the top of the contact type digital sensor 39 is turned on by a signal sent from the control box 42 when the inspection is completed, so that the operator can recognize the result of the inspection.

  FIG. 7 shows an embodiment in which the mounting structure of the sensor unit of the inspection apparatus is changed in the horizontal direction with respect to the crimping tool in the embodiment of FIG. In this embodiment, since the sensor contact 38 cannot touch the side surface of the crimping blade 33, the sensor lever 46 that is pivotally supported by the fulcrum pin 47 is provided.

  Further, FIG. 7A shows a state where the crimping blade 33 is closed, and FIG. 7B shows a state where the crimping blade 33 is opened.

  In this state diagram, the sensor contact 38 moves through the sensor lever 46 in the change between the open state and the closed state of the pressure bonding blade 33, and the state of the pressure bonding blade 33 is the same as in the embodiment shown in FIG. Can be measured.

  Here, if the opening amount when the crimping blade 33 is opened from the closed state (opening amount = 0) is A, the tolerance range is A = 6 mm. The amount of movement of the sensor contact 38 at that time was set to 2 mm in consideration of the time lag and wear at the time of measurement.

  The length of the sensor lever 46 and the position of the fulcrum pin 47, that is, the lever ratio were set so as to satisfy this relationship. Incidentally, in the example shown in FIG. 7, C: D = 30: 12.

  The control box 42 determines whether or not the movement amount 2 mm of the sensor contact 38 can be obtained.

  FIG. 8 further shows a structure for attaching the sensor unit of the inspection apparatus to a crimping tool having a different form from the crimping tool shown in FIGS. The same parts as those in FIG. 7 are denoted by the same reference numerals, and the same description is omitted.

  In the embodiment of FIG. 8, the sensor lever 6 for transmitting the opening / closing movement of the die tip to the sensor contact 38 is set in the same manner as in the embodiment of FIG.

  In the embodiment shown in FIG. 8, the movement amount of the sensor contact 38 is set to a smaller value of 0.8 mm.

  At this time, when the lever ratio was C: D = 30: 12 as in the embodiment of FIG. 7, the movement amount of the sensor contact 38 was 0.8 mm on average. Thereby, a smaller time lag is obtained compared to the embodiment of FIG.

  FIG. 9 is a diagram illustrating a circuit configuration example of the control box 42.

  FIG. 10 is an operation flowchart of the inspection apparatus of the present invention. The operation of FIG. 9 will be described with reference to FIG.

  When the power switch PSW of the control box 42 is turned on (step S1), electric power is supplied by the DC adapter 60, and the amplifier unit 50 is turned on (step S2).

  The air pressure bonding machine main body 100 of the pressure bonding tool to be inspected is set on the air pressure plunger 110. At this time, the crimp terminal and connecting wire are not set.

  In this state, when the operator turns on a foot switch (not shown) (step S2), air pressure is supplied to the air crimping machine main body 100 by the air pressure plunger 110, and the crimping blade 33 in the die portion is completely moved. The closed state is set (step S4).

  At this time, the amount of movement of the contact 38 is measured by the main circuit 51 and digitally displayed on the front panel of the control box 12 (step S5).

  At this time, the crimping blade 33 is fully closed and “0” should theoretically be displayed as a measured value, but an offset occurs depending on the respective characteristics of the crimping tool.

  Accordingly, the reset switch RSW is turned on to reset the display of the amplifier unit 42 to “0” in order to set a reference value in consideration of the offset for the crimping tool to be inspected (step S5A).

  As a result, the display of the amplifier unit 42 becomes “0” (step S6).

  Next, the operator turns off the foot switch (step S7) and opens the crimping blade 33. As a result, the crimp terminal and the connecting wire can be set between the crimp blades 33 (step S8).

  When the foot switch is turned on with the crimping terminal and the connecting wire set between the crimping blades 33 (step S9), air pressure is supplied to the air crimping machine main body 100, and the crimping blade 33 in the die portion is closed again. Driven (step S10).

  Thereby, the crimping terminal and the connecting wire between the crimping blades 33 are crimped (step S11). At the same time, the measured value measured by the contact type digital sensor 39 is displayed by the amplifier unit 43 (step S12).

  At this time, the amplifier unit 43 determines whether or not the measured value is within a predetermined tolerance range. If it is within the tolerance range, the determination signal LED 40 in the head part of the contact type digital sensor 39 is lit in green (step S13). At the same time, the buzzer 54 for notifying the end of the inspection is sounded (step S14), and a non-defective product confirmation process is performed (step S15). As a non-defective product confirmation process, the crimping blade 33 is opened and the set of the crimping tool is released from the air pressure plunger 110.

  When the inspection of another crimping tool is continued (step S15A, Y), a new crimping tool to be inspected is set on the air pressure plunger 110, and the process returns to step S3.

  On the other hand, when the value measured in step S12 is outside the tolerance range, the determination signal LED 40 in the head portion of the contact type digital sensor 39 is lit in red (step S16).

  As a result, the operator determines that the crimping tool to be inspected is in the defective area (step S17), and confirms and adjusts the tool (step S18). If it is not possible to cope with the adjustment, it is determined that repair is necessary (step S19).

  On the other hand, if it is determined that adjustment is possible, the process returns to step S3 for reconfirmation, and the inspection process after step S3 described above is executed to confirm the state.

  FIG. 11 shows verification data for confirming the effect of the inspection apparatus of the present invention.

  Five crimping tools (dies) of the same type were prepared as inspection samples. In each condition, the first sample is normal, the second sample has a little wear on the bracket pin, the third sample has a lot of wear on the bracket pin, and the fourth sample has a crack on the bracket. Some, and the fifth sample, is greatly appreciated with link wear.

  When the tolerance range of the measurement result is ± 0.1 mm, the first to third samples are within the tolerance range, and the fourth and fifth samples are out of the tolerance range, and are determined to be defective.

  At this time, the crimping height of the crimped terminal was 2.80 mm in the first sample data, which is a non-defective product.

  Compared to this, as shown in FIG. 11, the crimping heights of the terminals of the second to fifth samples are 2.95, 2.98, and 3.00, respectively, and there is an error with respect to the values of normal samples. It has been shown to grow.

  Therefore, it can be understood that the inspection device to which the present invention is applied can easily and accurately determine whether the crimping tool is good or defective.

  According to the present invention, it is possible to determine the pass / fail of the performance only by checking the meter display and the presence / absence of the pass lamp without depending on the operator's sense of the performance of the crimping tool (die).

  Therefore, the reliability of the inspection can be increased without depending on skilled workers, and the reliability of the product can be improved and the cost can be reduced, which greatly contributes to the industry.

It is a figure which shows the example of a manual crimping tool. FIG. 3 is a partially enlarged view showing a cross section of a crimp terminal passing through a die tip portion 2 and an electric wiring material positioned in a gap positioned at the die tip portion 2. It is a figure which shows the state by which the main-body part 10a of the crimp terminal 10 is crushed, and the core part 12 of an electrical wiring material is connected to the crimp terminal. It is a figure explaining the judgment whether the manual crimping tool using a designated gauge has passed the standard. It is a figure which shows the conceptual structure of the crimping tool comprised so that the handle | steering_wheel 1 of the manual crimping tool shown in FIG. 1 might be pressurized with air. It is a figure which shows the embodiment of the inspection apparatus of the crimping | compression-bonding tool according to this invention. It is a figure which shows the Example which changed the attachment structure of the sensor part of a test | inspection apparatus with respect to the crimping | compression-bonding tool in the Example of FIG. It is a figure which shows the attachment structure of the sensor part of an inspection apparatus with respect to the crimping tool of a form different from the crimping tool shown in FIG. It is a figure which shows the circuit structural example of a control box. It is an operation | movement flowchart of the test | inspection apparatus of this invention. It is verification data for confirming the effect of the inspection apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Crimping tool main part 110 of a crimping tool 110 Air pressure plunger 2 Die front-end | tip part 32 Crimping die bracket 33 Crimping blade 34 Die set pin 35 Sensor bracket 36 Spacer 37 Sensor holder 38 Contact 39 Contact type digital sensor 40 Determination signal LED
41 Die tip 42 Control box 43 Amplifier unit 44 Reset button 45 Power switch

Claims (5)

A crimping tool inspection device for crimping and connecting a crimping terminal with a connecting conductor inserted between a pair of crimping blades.
A contactor arranged to move along one side of a pair of crimping blades of the crimping tool;
A sensor for detecting the amount of movement of the contact;
An amplifier unit that obtains the size of the gap between the pair of crimping blades from the amount of movement of the contact detected by the sensor, and displays the obtained size of the gap between the pair of crimping blades,
A crimping tool inspection apparatus characterized by comprising: In claim 1,
When the output value of the sensor detected when the tip ends of the pair of crimping blades are closed is used as a reference value, a crimping terminal is inserted between the pair of crimping blades and the pair of crimping blades is closed again. A crimping tool inspection apparatus capable of determining whether a crimping tool having the pair of crimping blades is good or not based on whether or not the detected movement amount of the contactor is within a predetermined tolerance range. . In claim 1 or 2,
The sensor corresponds to a change in impedance of the primary coil that generates a magnetic field, a core that is connected to the contactor and that is inserted into the primary coil, and further changes depending on the amount of insertion of the core. An inspection apparatus for a crimping tool comprising a secondary coil for detecting a signal coil current to be detected. In claim 1,
An apparatus for inspecting a crimping tool, wherein the contact is arranged so as to directly contact one side surface of the pair of crimping blades. In claim 1,
A sensor lever supported by a fulcrum pin; the contact is in contact with the tip of one side of the sensor lever with respect to the fulcrum pin; the tip of the other side of the sensor lever is the pair of crimp blades An apparatus for inspecting a crimping tool, wherein the inspection apparatus is configured to contact one side surface of the crimping tool.

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