JP5633853B2 - Precision micro-sliding tester - Google Patents

Description

  The present invention relates to a precision microsliding tester, and more particularly, to a precision microsliding tester for testing a phenomenon of fretting corrosion caused by a slight sliding of a contact between a male terminal and a female terminal which are electrically connected. .

For example, in the electrical system of an automobile, when two electric wires (lead wires) are electrically connected to each other, a male connector provided at one end and a female connector provided at the other end are engaged with each other. Many of the configurations are used.
The male connector and the female connector are respectively provided with a male terminal and a female terminal, which are metal terminals, in a casing made of plastic, for example. The casings of the male connector and the female connector are formed so as to be able to engage with each other. When the casings are engaged with each other, the male terminal is inserted into the female terminal and is electrically connected to each other. It has become.

By the way, it is known that a so-called fretting corrosion phenomenon occurs at the contact between the male terminal and the female terminal due to expansion and contraction of the casing due to the mechanical vibration of the automobile and the influence of heat.
This fretting corrosion is a phenomenon in which an oxide film or the like is deposited between the contacts by repeating minute vibrations generated at the contact of the terminal or reciprocating sliding motion, and when this phenomenon occurs, the contact resistance increases. . Therefore, when the contact resistance becomes too large due to fretting corrosion, there is a problem that a contact failure occurs.

In order to solve the above-mentioned problems, it has been attempted to generate a fretting corrosion phenomenon on a testing machine.
For example, at the contact point between the male terminal and the female terminal, the amplitude at which fretting corrosion occurs is in the range of ± several μm, and the testing machine requires a driving means for sliding the contact point within that range. Is done.
For example, Patent Document 1 discloses a testing machine that causes fretting corrosion by causing a pair of connected male terminals and female terminals to slide finely with a piezoelectric actuator (piezoelectric vibrator). That is, a piezo actuator is used as a driving means for fine sliding of the contact, and the fine sliding of the contact is generated.
In Patent Document 1, the quality of the terminal design is determined by measuring the electrical resistance between the two terminals after the occurrence of fretting corrosion.

Japanese Patent No. 3899048

However, in the configuration in which the terminal contact is finely slid (several μm) by a piezo actuator as in the testing machine disclosed in Patent Document 1, the straightness of the amplitude of the vibrator is poor. There was a problem that fine sliding could not be generated accurately.
That is, since the sliding (amplitude) of the terminal contact cannot be generated accurately, the amplitude region in which fretting corrosion occurs is different from the actual one, and there is a possibility that the quality determination of the design of the metal terminal or the connector casing cannot be performed correctly. there were.

In addition, in order to identify the cause of fretting corrosion, it is necessary to generate fretting corrosion in a testing machine, measure the relative displacement of terminal contacts, and record changes over time such as deposits and shape changes that occur at the contacts. is necessary.
In measuring the relative displacement of the terminal contacts, there is also a method of measuring the scar generated after the sliding test and judging the displacement based on the measured scar, but it is not clear what state the scratch has occurred. Therefore, it cannot be said that accurate relative displacement measurement is possible.
Moreover, since the metal terminal is generally covered with the connector casing, there has been a problem that it is impossible to capture temporal changes such as deposits and shape changes generated at the terminal contacts.

  The present invention has been made under the circumstances as described above, and in a precision microsliding tester that finely slides the contacts of two metal terminals connected to each other, the fine sliding of the terminal contacts is enhanced. An object of the present invention is to provide a precision micro-sliding tester capable of accurately generating the relative displacement of the terminal contact due to the micro-sliding and observing a change with time in the vicinity of the terminal contact. And

In order to solve the above problems, the precision microsliding tester according to the present invention is a precision microsliding test in which a contact point between a male terminal and a female terminal electrically connected to each other is slightly slid in the front-rear direction. In this machine , a rectangular plate-like block plate disposed on a base so as to be movable in the front-rear direction, the male terminal and the female terminal are respectively held and formed so as to be able to engage with each other, and one of them is the base. It has a pair of casings fixed to the base and the other fixed to the block plate, and an end portion that can be advanced and retracted in the front-rear direction, and is arranged so that the end portion comes into contact with either the front or rear side of the block plate A piezoelectric vibrator driving means that vibrates the end portion in the front-rear direction by giving a predetermined drive voltage waveform to the piezoelectric vibrator, and displacement of the block plate in the front-rear direction. Inspection Electrical measuring the block displacement detector, and the relative displacement detecting means for detecting a slight sliding of the relative displacement of the contact point between the male and female terminals, the electrical characteristics between the said male and female terminals to and characteristic measuring means, based on the output of the block displacement detecting means and the relative displacement detecting means, and control means for controlling the operation of the piezoelectric vibrator driving means, said control means, said block displacement detecting means detects Using the displacement of the reciprocating movement of the block plate, feedback control for correcting the phase shift of the driving voltage waveform applied to the piezoelectric vibrator driving means is performed, and the male terminal and female detected by the relative displacement detecting means are performed. using the relative displacement of the fine sliding contact with the terminal, performs a feedback control for determining the amplitude value of the drive voltage waveform applied to the piezoelectric vibrator driving means, the electrical characteristic A precise fine sliding test machine for outputting a change in electrical characteristics of the terminal contacts have a constant section was measured, further, the four corners of the block plates is moved in the longitudinal direction the block plates relative to the base Each of the elastic hinges is provided, and an urging force is applied between the block plate and the base in a direction opposite to the pressing direction applied to the block plate by the end portion of the piezoelectric vibrator. An elastic member is provided, and the end portion of the piezoelectric vibrator abuts against either the front or rear side of the block plate regardless of the advance / retreat position by the urging force of the elastic member, and the tip of the end portion is It is characterized in that it is point-contacted with the side surface of the block plate by being formed into a spherical surface .

By comprising in this way, a vibration waveform can be given to the contact of the connected male terminal and female terminal via the block board which has the amplitude performance excellent in the straightness. That is, even when the accuracy of linearity of the piezoelectric vibrator is low, vibration (amplitude) having high accuracy of linearity can be applied to the terminal contact through the block plate.
Further, by feeding back the reciprocal displacement of the block plate and the relative displacement of the fine sliding of the contact between the male terminal and the female terminal to the drive voltage waveform of the piezoelectric vibrator, the fine sliding of the terminal contact is enhanced. It can be generated with accuracy.
That is, the sliding of the terminal contact occurs with high accuracy and a change in electrical characteristics (for example, resistance value) between the male terminal and the female terminal is output. It is possible to accurately know the occurrence timing of contact failure due to ting corrosion, and to analyze the cause of the phenomenon.

In particular, an elastic member that provides an urging force in a direction opposite to a pressing direction applied to the block plate by the end portion of the piezoelectric vibrator is provided between the block plate and the base. Due to the urging force, the end portion of the piezoelectric vibrator abuts against any one of the front and rear side surfaces of the block plate regardless of the advance / retreat position thereof, and the end of the end portion is formed into a spherical surface, whereby the block plate side because not point contact to, block plate, and the stress from the end portion of the piezoelectric vibrator to the elastic hinges of the four corners of the can give equally.

In order to solve the above problems, the precision microsliding tester according to the present invention is a precision microsliding test in which a contact point between a male terminal and a female terminal electrically connected to each other is slightly slid in the front-rear direction. In this machine , a rectangular plate-like block plate disposed on a base so as to be movable in the front-rear direction, the male terminal and the female terminal are respectively held and formed so as to be able to engage with each other, and one of them is the base. It has a pair of casings fixed to the base and the other fixed to the block plate, and an end portion that can be advanced and retracted in the front-rear direction, and is arranged so that the end portion comes into contact with either the front or rear side of the block plate A piezoelectric vibrator driving means that vibrates the end portion in the front-rear direction by giving a predetermined drive voltage waveform to the piezoelectric vibrator, and displacement of the block plate in the front-rear direction. Inspection Electrical measuring the block displacement detector, and the relative displacement detecting means for detecting a slight sliding of the relative displacement of the contact point between the male and female terminals, the electrical characteristics between the said male and female terminals to Characteristic measuring means, and control means for controlling the operation of the piezoelectric vibrator driving means based on outputs of the block displacement detecting means and relative displacement detecting means , the control means being detected by the block displacement detecting means. Using the displacement of the reciprocating movement of the block plate, feedback control for correcting the phase shift of the driving voltage waveform applied to the piezoelectric vibrator driving means is performed, and the male terminal and female detected by the relative displacement detecting means are performed. using the relative displacement of the fine sliding contact with the terminal, performs a feedback control for determining the amplitude value of the drive voltage waveform applied to the piezoelectric vibrator driving means, the electrical characteristic A precise fine sliding test machine for outputting a change in electrical characteristics of the terminal contacts have a constant section was measured, and further, the one of at least the pair of casings, observation points of contact with the male terminal and the female terminal An observation window is provided, and includes an imaging unit for imaging a contact point of the two terminals through the observation window, and the relative displacement detection unit is based on an image captured by the imaging unit, It is characterized in that the relative displacement of the contact points of the two terminals is calculated.
By configuring in this way, the terminal contact is fed back by feeding back the displacement of the reciprocating movement of the block plate and the relative displacement of the fine sliding of the contact between the male terminal and the female terminal to the drive voltage waveform of the piezoelectric vibrator. Can be reproduced with high accuracy.
That is, the fine sliding of the terminal contact is reproduced with high accuracy, and a change in electrical characteristics (for example, resistance value) between the male terminal and the female terminal is output. It is possible to accurately know the timing of occurrence of ting corrosion and to analyze the cause of the phenomenon.
In particular, at least one of the pair of casings is provided with an observation window for observing the contact point of the two terminals, and imaging for imaging the contact point of the two terminals through the observation window. to provide a means, since it becomes possible imaging by the imaging means through the observation window, the relative displacement of the terminal contact can be accurately measured, it is possible to record the time course of terminal contact as an image . Further, since the relative displacement detection means calculates the relative displacement of the contact between the two terminals based on the image captured by the imaging means, the relative displacement due to the slight sliding of the contact between the male terminal and the female terminal can be easily performed. And it can obtain with high precision.

Further, the block displacement detecting means is based on a change in electrostatic capacitance between the sensor unit fixed to the base and the block plate moving in the front-rear direction with respect to the base. It is desirable to include a capacitance sensor that detects reciprocal displacement.

  According to the present invention, in the precision fine sliding test machine for finely sliding the contact points of the two metal terminals connected to each other, the fine sliding of the terminal contact is generated with high accuracy, and the fine sliding causes the fine contact. It is possible to accurately obtain the relative displacement of the terminal contacts, and to obtain a precision microsliding tester capable of observing changes with time in the vicinity of the terminal contacts.

FIG. 1 is a side view schematically showing the overall configuration of a precision microsliding tester according to the present invention. FIG. 2 is a perspective view showing a main part of the precision microsliding tester of FIG. 3 is a cross-sectional view taken along line AA in FIG. 4 is an enlarged cross-sectional view of a part of FIG. FIG. 5 is a functional block diagram of a feedback control program executed by the control PC provided in the precision microsliding tester of FIG. FIG. 6 is a flowchart showing the flow of feedback control of FIG. FIG. 7 is a plan view schematically showing a female terminal and a male terminal shown in a photographed image input from a camera included in the precision microsliding tester of FIG.

  Hereinafter, embodiments of a precision microsliding tester according to the present invention will be described with reference to the drawings. FIG. 1 is a side view schematically showing the overall configuration of the precision microsliding tester of the present invention, and FIG. 2 is a perspective view showing the main part of the precision microsliding tester of FIG. FIG. 3 is a cross-sectional view taken along the line AA of FIG.

1 measures the resistance value between a male terminal and a female terminal that are electrically connected to each other, and detects the timing of occurrence of fretting corrosion from the change in the measured value. This is an apparatus for observing the state of the terminal contact at that time.
The precision microsliding tester 100 includes a microsliding device 1 provided on a first base 2 made of, for example, a table, and a camera 8 (imaging means) disposed above the microsliding device 1. With. The camera 8 is supported by an arm 7, and the arm 7 is attached to a camera stand 6 erected on the first base 2 so as to be movable up and down. The camera 8 is provided with macro lenses 9 and 10 that enable high-magnification photography, and is focused on a connector (terminal contact) on the fine sliding device 1. The camera 8 is a camera capable of high-speed shooting that performs moving image shooting at a high frame rate (for example, 60 fps).

The precision microsliding tester 100 includes a piezoelectric amplifier 4 (piezoelectric vibrator driving means) that applies a predetermined driving voltage waveform to a piezoelectric actuator 21 that is a piezoelectric vibrator mounted on the microsliding apparatus 1, and And a control box 3 for driving and controlling the piezo amplifier 4 and the like.
The entire testing machine including the control box 3 and the camera 8 is controlled by a control PC (Personal Computer) 11. The control box 3 and the control PC 11 constitute a control means.
The control PC 11 includes a central processing unit (CPU) 11a that performs arithmetic processing, a main storage device 11b that includes a RAM (Random Access Memory), and an auxiliary storage device 11c that includes a hard disk.

The auxiliary storage device 11c stores a feedback control program for realizing a function of controlling the drive voltage waveform of the piezo actuator 21 so that the relative displacement and frequency due to the sliding of the terminal contact coincide with the target value. Yes.
The function is realized by the CPU 11a loading and executing the feedback control program stored in the auxiliary storage device 11c into the main storage device 11b.
The control PC 11 is connected to a keyboard 12 and a mouse (not shown) as input devices and a monitor 13 as an output device.

The fine sliding device 1 is configured as shown in FIGS. In the description of FIG. 2 and FIG. 3, the Y-axis positive direction shown in the figure is the front side, and the Y-axis negative direction is the rear side.
As shown in the drawing, the fine sliding device 1 is provided with a columnar piezo actuator 21 (piezoelectric vibrator) extending along the Y-axis direction on the second base 20, and a movable end 21a at the front end thereof is a rectangular plate. It is provided in the state which contact | abuts to the rear side surface of the elastic hinge block 22 (block board) of a shape.

  More specifically, a frame body 20a having a height (thickness) dimension higher than the base surface and a predetermined width dimension is provided at the periphery of the second base 20 formed in a square plate shape. It is integrally formed with the base 20. The piezo actuator 21 is disposed at the center of the second base 20, the fixed end 21b at the rear end thereof is in contact with the inner surface of the rear side of the frame body 20a, and the outer side of the frame body 20a is opposed to the frame body 20a. It is fixed by bolts 31 from the side. The front outer peripheral surface of the piezo actuator 21 is covered with a semicircular support member 32 and is bolted to the second base 20.

  As shown in FIG. 2, the substantially rectangular plate-like elastic hinge block 22 has a main block 22a at the center and elastic hinges 22b arranged at the four corners. On both the left and right sides of the main block portion 22a, a mounting block portion 22c is disposed between the two elastic hinges 22b disposed at the front and rear, and is fixed to the second base 20 by bolts 33. As a result, the main block portion 22a is in a state of being provided movably back and forth with respect to the second base 20 by the elastic hinges 22b disposed at the four corners thereof. The main block portion 22a, the elastic hinge 22b, and the mounting block 22c are each formed by making a cut (slit SL) in one block plate.

More specifically, each elastic hinge 22b is formed to have a large thickness, like the main block portion 22a and the mounting block 22c. Also, as shown in the drawing, a plurality of (two in the drawing) plate-like bodies are arranged in parallel in the Y-axis direction by alternately providing a plurality of cuts (slit SL) extending in the X direction from the left and right. It has become.
The elastic hinges 22b configured in this way are arranged symmetrically in the front-rear and left-right directions at the four corners of the main block portion 22a, and each elastic hinge 22b has a predetermined thickness. Even if a force other than the above acts, the force other than the Y-axis direction is canceled out and moves only in the Y-axis direction.
Therefore, even if the movable end 21a that vibrates in the front-rear direction of the piezo actuator 21 moves in a so-called roll direction, pitch direction, yaw direction, or the like, the main block portion 22a of the elastic hinge block 22 remains in the front-rear direction (Y-axis direction). ), And a small amplitude with high straightness can be obtained.

A groove 22d that is long in the Y direction is formed in the center of the main block 22a, and a spring 34 (elastic member) is accommodated therein. As shown in FIG. 3, the spring 34 has a front end 34a fixed to the base 20 and a rear end 34b that urges the main block portion 22a in the rearward direction.
Due to the urging force of the spring 34, the movable end 21a at the front end of the piezo actuator 21 is in contact with the rear side surface of the elastic hinge block 22 (the main block portion 22a) as described above regardless of the forward / backward position. Maintained.
The distal end of the movable end 21a is formed in a spherical shape, and is configured to make point contact with the rear side surface of the main block portion 22a. Therefore, stress is evenly applied to the elastic hinges 22b arranged in the front, rear, left, and right objects at the four corners of the main block portion 22a.

FIG. 4 is an enlarged cross-sectional view showing the periphery of the terminal connection portion in FIG. As shown in FIGS. 2 to 4, a connector casing 24 that holds a male terminal 25 is fixed on a frame 20 a on the front end side of the second base 20 by a bolt 27 via a pressing member 26 ( That is, the male terminal 25 and the connector casing 24 are fixed to the frame body 20a).
On the other hand, the connector casing 23 that accommodates the female terminal 28 is fixed to the main block portion 22 a of the elastic hinge block 22 by a bolt 30 via a pressing member 29. Then, the female terminal 28 is fitted into the male terminal 25, and the connector casing 23 of the female terminal 28 is engaged with the connector casing 24 of the male terminal 25, thereby being electrically connected to each other. .
A plurality of observation windows 23a, 24a, and 26a are provided on the upper surface side of the connector casings 23 and 24 and the upper surface side of the pressing member 26, respectively, so that the terminal contacts can be observed.
Further, as shown in FIG. 1, lead wires 37 and 38 are drawn out from the female terminal 28 and the male terminal 25, respectively, and connected to a resistance value detection circuit (electrical characteristic measuring means) (not shown) in the control box 3. Has been. In this resistance value detection circuit, for example, the resistance of the terminal contact is measured by passing a constant current between the female terminal 28 and the male terminal 25. The output of the resistance value detection circuit is input to the control PC 11 and can be observed, for example, in a graph in time series on the monitor 13. That is, it is configured such that the occurrence of fretting corrosion at the contact point between the female terminal 28 and the male terminal 25 can be grasped by the change in the resistance value.

Further, as shown in FIG. 3, a through-hole 20b penetrating in the front-rear direction (Y direction) is formed in the frame 20a on the front end side of the base 20, and a capacitance sensor 36 (block displacement detecting means) is formed there. ) Is inserted. A sensor portion 36 a is provided at the tip of the capacitance sensor 36 and is disposed so as to face the front side surface of the main block portion 22 a of the elastic hinge block 22.
The capacitance sensor 36 is connected to the control PC 11 via the control box 3 and is configured so that the temporal displacement of the reciprocating movement of the elastic hinge block 22 (main block portion 22a) is calculated in the control PC 11. .
That is, in the control PC 11 that functions as block displacement detecting means, the electrostatic capacity of the electrostatic capacity sensor 36 changes as the main block portion 22a of the elastic hinge block 22 reciprocates in the front-rear direction (Y direction). Based on the change in capacitance, the displacement of the reciprocating movement of the main block portion 22a is measured.

  Subsequently, the function of the feedback control program executed by the control PC 11 will be further described with reference to FIGS. FIG. 5 is a functional block diagram of a feedback control program executed by the control PC 11. FIG. 6 is a flowchart showing the flow of the feedback control.

First, the operator activates the feedback control program stored in the auxiliary storage device 11c in the control PC 11.
When the program is started, a target displacement of the terminal contact, a waveform (for example, a sine wave) and a frequency input setting screen for finely sliding the terminal contact are displayed on the monitor 13, and the operator presses the keyboard 12. Each is used to input a target value or the like (reference F1 in FIG. 5, step S1 in FIG. 6).
Further, the control PC 11 generates a drive voltage waveform for driving the piezo actuator 21 based on the input target value and the like (reference F8 in FIG. 5, step S2 in FIG. 6).

  Further, a drive execution button (not shown) of the piezo actuator 21 is displayed on the monitor 13, and the piezo amplifier is selected based on the drive voltage waveform generated in step S <b> 2 when the operator selects it. 4 drives the piezo actuator 21 (step S2 in FIG. 6). At this time, the camera 8 is activated and photographing of the terminal contact is started through the observation windows 23a, 24a, and 26a.

Thus, when the piezo actuator 21 is first driven, the terminal contact between the female terminal 28 and the male terminal 25 slides. That is, when the movable end 21a of the piezoelectric actuator 21 moves forward, the rear side surface of the main block portion 22a of the elastic hinge block 22 is pressed by the movable end 21a, and the main block portion 22a also moves forward. On the other hand, when the movable end 21 a moves backward, the main block portion 22 a is pushed back by the urging force of the spring 34. The movable end 21a reciprocates forward and backward repeatedly with a predetermined waveform (for example, sine wave) amplitude and frequency (reference F2 in FIG. 5). Therefore, the main block portion 22a and the connector casing 23 of the male terminal 25 fixed on the main block portion 22a reciprocate forward and backward in synchronization with the main block portion 22a.
Here, since the connector casing 24 that holds the male terminal 25 is fixed to the frame body 20a of the second base 20, the female terminal 28 repeatedly advances and retreats at a predetermined frequency with respect to the male terminal 25, and the terminal contact Will slide (reference F3 in FIG. 5).

Further, the displacement of the forward and backward movement (reciprocal movement) of the main block portion 22 a of the elastic hinge block 22 is detected by the electrostatic capacitance sensor 36.
That is, the electrostatic capacitance between the electrostatic capacitance sensor 36 and the elastic hinge block 22 is detected, and based on the change, the temporal displacement of the reciprocating movement of the main block portion 22a is calculated in the control PC 11 (FIG. 5 F4, step S4 in FIG. 6).

On the other hand, the camera 8 images the terminal contact through the observation windows 23a, 24a, and 26a, and the captured image is input to the control PC 11.
The control PC 11 functions as a relative displacement detection means, and calculates the relative displacement of the terminal contact by analyzing the input video (reference F6 in FIG. 5 and step S5 in FIG. 6).
More specifically, as shown in FIG. 7, the captured video input from the camera 8 shows a male terminal 25 and a female terminal 28 connected to each other. The male terminals 25 and the female terminals 28 are respectively provided with markings M1 and M2 for measurement. The control PC 11 includes a state in which the female terminal 28 in FIG. 7A is most advanced with respect to the male terminal 25 (a state in which the female terminal 28 is most inserted into the male terminal 25), and a state in which the female terminal 28 in FIG. On the other hand, an image in the most retracted state (a state where it is inserted shallowly into the male terminal 25) is extracted. Then, the displacement d1 of the position of the marking M2, which is the displacement of the female terminal 28, is obtained, the displacement d2 of the position of the marking M1, which is the displacement of the male terminal 25, is obtained, and the subtraction result is referred to as a relative displacement (d1-d2). To do.

Thus, first, sliding of the terminal contact is generated based on the drive voltage waveform generated in step S2, and the time displacement of the reciprocating movement of the main block portion 22a is measured, and the relative displacement of the terminal contact is measured. When the measurement is performed, first and second feedback processes are executed.
That is, as the first feedback processing, PID control (proportionality of deviation between target value and output value, integration, differential control) is executed based on the relative displacement of the terminal contact measured in step S5. The amplitude value of the drive voltage waveform is corrected so that the relative displacement converges to the target displacement in step S1 (reference F7 in FIG. 5 and step S6 in FIG. 6).
In the control PC 11, a new drive voltage waveform of the piezo actuator 21 is generated using the amplitude value corrected in step S6 (reference F8 in FIG. 5, step S7 in FIG. 6).

As the second feedback process, PID control is executed based on the reciprocal displacement of the main block portion 22a measured in step S4. Then, the displacement of the displacement waveform with respect to the drive voltage waveform generated in step S2 is corrected (reference F5 in FIG. 5 and step S8 in FIG. 6).
That is, since a vibration wave is transmitted to the female terminal 28 and the male terminal 25 via the main block portion 22a of the elastic hinge block 22, the displacement of the drive voltage waveform is corrected so that the displacement waveform is eliminated. .

When the drive voltage waveform whose displacement is corrected in step S8 is generated, the piezoelectric actuator 21 is driven by the drive voltage waveform (step S9 in FIG. 6).
As a result, the main block portion 22a of the elastic hinge block 22 is reciprocated by the vibration wave based on the corrected new drive voltage waveform, and the terminal contacts slide (reference numerals F2 and F3 in FIG. 5).

In addition, the displacement of the main block portion 22a of the elastic hinge block 22 based on the new drive voltage waveform is measured using the capacitance sensor 36 as described above (reference numeral F4 in FIG. 5 and FIG. 6). In step S10), the result is fed back again. That is, the displacement of the drive voltage waveform is corrected again by the PID control (reference F5 in FIG. 5, step S8 in FIG. 6).
Further, the relative displacement of sliding of the terminal contact based on the new drive voltage waveform is measured using the camera 8 as described above (reference F6 in FIG. 5, step S11 in FIG. 6), and the result is fed back again. Is done. That is, the amplitude value of the drive voltage waveform is corrected again by PID control (reference F7 in FIG. 5, step S6 in FIG. 6).
Then, the loop processing from step S6 to step S11 is repeatedly executed until stop control of the testing machine is performed, and the driving voltage waveform of the piezo actuator 21 for matching the sliding displacement and frequency of the terminal contact with the target value. Will be determined.

When fretting corrosion occurs at the terminal contact that slides at the target displacement and frequency, the operator knows the timing of occurrence of contact failure caused by the change by the change in the resistance value of the terminal contact displayed on the monitor 13. be able to.
Further, the worker analyzes the cause of the occurrence of the phenomenon together with the image captured by the camera 8 (step S12 in FIG. 6).

As described above, according to the embodiment of the present invention, the vibration wave (sine wave, rectangular wave, triangular wave, etc.) applied to the connector by, for example, mechanical vibration of an automobile is oscillated by the movable end 21a of the piezo actuator 21. Generated by. And the vibration waveform is given to the connector casing 23 via the elastic hinge block 22 having the amplitude performance excellent in straightness.
Further, as the first feedback processing, sliding of the terminal contact (contact between the male terminal 28 and the female terminal 25) is observed by the camera 8 so that the relative displacement converges to the target displacement of the sliding of the terminal contact. The amplitude of the drive voltage waveform of the piezo actuator 21 is corrected.
Furthermore, as the second feedback processing, the temporal displacement of the reciprocating movement of the elastic hinge block 22 (the main block portion 22a) is measured, and based on the measured displacement, the target value of the drive voltage waveform of the piezo actuator 21 is determined. Correction is performed so as to eliminate the displacement waveform displacement.
In other words, the drive voltage waveform of the piezo actuator 21 for obtaining the target value (displacement, frequency) of the sliding of the terminal contact is increased by the elastic hinge block 22 having the amplitude performance excellent in linearity and the two feedback processes. It can be obtained with high accuracy, and fine sliding of the terminal contact can be generated with high accuracy.
In addition, since the observation windows 23a and 24a are provided in the connector casings 23 and 24, it is possible to photograph with the camera 8, so that the relative displacement of the terminal contacts can be accurately measured, and the change of the terminal contacts with time can be measured. It can be recorded as an image.
That is, the fine sliding of the terminal contact occurs with high accuracy, the change in resistance value between the male terminal and the female terminal is output to the monitor 13, and the temporal change of the terminal contact is recorded as an image. It is possible to accurately know the occurrence timing of contact failure due to fretting corrosion under predetermined setting conditions, and to analyze the cause of the phenomenon.

In the above-described embodiment, the movable end 21a of the piezo actuator 21 is in contact with the rear side surface of the main block portion 22a. However, the present invention is not limited to this configuration. That is, the movable end 21a may be configured to abut against the front side surface of the main block portion 22a, and the spring 34 may be arranged to be biased in the direction opposite to the pressing direction.
In the above embodiment, the capacitance sensor is used as the means for detecting the reciprocal displacement of the main block portion 22a. However, the present invention is not limited to this, and other detection means are used. May be.
Further, in the above-described embodiment, the resistance value measurement is performed as the electrical characteristic measuring means. However, the present invention is not limited thereto, and the measured voltage value is input to the control PC 11 as the electrical characteristic. May be.

In the embodiment, the male terminal 25 is fixed to the frame body 20a, the female terminal 28 is fixed to the main block portion 22a, and the female terminal 28 is inserted into the male terminal 25. However, it is not limited to the configuration.
For example, the female terminal 28 may be fixed to the frame body 20a, the male terminal 25 may be fixed to the main block portion 22a, and the male terminal 25 may be fitted into the female terminal 28.
Further, the shape of the connector casings 23 and 24 and the structure of the engagement are not limited, and the present invention can be applied regardless of the connector shape. In that case, what is necessary is just to form the shape of the holding members 26 and 29 according to a connector shape.
Further, the metal terminals may be directly pressed and fixed by the pressing members 26 and 29. With such a configuration, even a metal terminal having no connector casing can be tested using the precision fine sliding tester of the present invention.

  Moreover, in the said embodiment, although it was set as the structure which attaches the macro lenses 9 and 10 to the camera 8 and image | photographs, it is not restricted to this, You may replace the macro lenses 9 and 10 with a microscope.

1 Fine sliding device 2 First base 3 Control box (control means)
4 Piezo amplifier (piezoelectric vibrator driving means)
8 Camera (imaging means)
10 Joining members 11 Control PC (control means, block displacement detection means, relative displacement detection means)
20 Second base (base)
21 Piezo actuator (piezoelectric vibrator)
22 Elastic hinge block 22a Main block (block plate)
22b Elastic hinge 23 Connector casing (casing)
23a Observation window 24 Connector casing (casing)
24a Observation window 25 Male terminal 28 Female terminal 34 Spring (elastic member)
36 Capacitance sensor (block displacement detection means)
100 Precision fine sliding tester

Claims (3)

In a precision microsliding tester that microslids the contact between the male terminal and female terminal electrically connected to each other in the front-rear direction ,
A rectangular plate-like block plate arranged to be movable in the front-rear direction on the base;
A pair of casings, each holding the male terminal and the female terminal, formed so as to be engageable with each other, one fixed to the base, and the other fixed to the block plate;
A piezoelectric vibrator having an end portion capable of advancing and retreating in the front-rear direction, and disposed so that the end portion abuts on any one of the front and rear side surfaces of the block plate;
Piezoelectric vibrator driving means for vibrating the end portion in the front-rear direction by giving a predetermined driving voltage waveform to the piezoelectric vibrator;
Block displacement detection means for detecting displacement of reciprocating movement in the front-rear direction of the block plate;
A relative displacement detecting means for detecting a relative displacement of fine sliding of the contact between the male terminal and the female terminal;
Electrical characteristic measuring means for measuring electrical characteristics between the male terminal and the female terminal;
Based on said output of the block displacement detector and the relative displacement detecting means, and control means for controlling the operation of the piezoelectric vibrator driving means,
Wherein said control means uses the displacement of the reciprocating movement of the block plate in which the block displacement detecting unit detects, performs feedback control to correct the deviation of the phase of the drive voltage waveform applied to the piezoelectric vibrator driving means, said Using the relative displacement of the fine sliding of the contact between the male terminal and the female terminal detected by the relative displacement detecting means, feedback control is performed to determine the amplitude value of the driving voltage waveform applied to the piezoelectric vibrator driving means,
A precision micro-sliding tester that outputs a change in electrical characteristics of terminal contacts measured by the electrical characteristic measuring means ,
Furthermore, at each of the four corners of the block plate, elastic hinges that enable the block plate to move in the front-rear direction with respect to the base are provided, respectively.
And between the block plate and the base is provided an elastic member that applies a biasing force in a direction opposite to the pressing direction that the end portion of the piezoelectric vibrator applies to the block plate,
Due to the biasing force of the elastic member, the end portion of the piezoelectric vibrator comes into contact with any one of the front and rear side surfaces of the block plate regardless of the advance / retreat position, and the end of the end portion is formed into a spherical surface. Thus, the fine fine sliding tester is characterized in that it is in point contact with the side surface of the block plate. In a precision microsliding tester that microslids the contact between the male terminal and female terminal electrically connected to each other in the front-rear direction ,
A rectangular plate-like block plate arranged to be movable in the front-rear direction on the base;
A pair of casings, each holding the male terminal and the female terminal, formed so as to be engageable with each other, one fixed to the base, and the other fixed to the block plate;
A piezoelectric vibrator having an end portion capable of advancing and retreating in the front-rear direction, and disposed so that the end portion abuts on any one of the front and rear side surfaces of the block plate;
Piezoelectric vibrator driving means for vibrating the end portion in the front-rear direction by giving a predetermined driving voltage waveform to the piezoelectric vibrator;
Block displacement detection means for detecting displacement of reciprocating movement in the front-rear direction of the block plate;
A relative displacement detecting means for detecting a relative displacement of fine sliding of the contact between the male terminal and the female terminal;
Electrical characteristic measuring means for measuring electrical characteristics between the male terminal and the female terminal;
Control means for controlling the operation of the piezoelectric vibrator driving means based on the outputs of the block displacement detection means and the relative displacement detection means ,
Wherein said control means uses the displacement of the reciprocating movement of the block plate in which the block displacement detecting unit detects, performs feedback control to correct the deviation of the phase of the drive voltage waveform applied to the piezoelectric vibrator driving means, said Using the relative displacement of the fine sliding of the contact between the male terminal and the female terminal detected by the relative displacement detecting means, feedback control is performed to determine the amplitude value of the driving voltage waveform applied to the piezoelectric vibrator driving means,
A precision micro-sliding tester that outputs a change in electrical characteristics of terminal contacts measured by the electrical characteristic measuring means ,
Furthermore, at least one of the pair of casings is provided with an observation window for observing a contact point between the male terminal and the female terminal,
The image sensor includes an imaging unit for imaging the contact point of the two terminals through the observation window, and the relative displacement detection unit calculates a relative displacement of the contact point of the two terminals based on an image captured by the imaging unit. Precision micro-sliding tester characterized by calculating. The block displacement detection means includes
Based on a change in capacitance between the sensor unit fixed to the base and the block plate that moves in the front-rear direction with respect to the base, an electrostatic that detects a displacement of the block plate reciprocating is detected. The precision microsliding tester according to claim 1 or 2, further comprising a capacitance sensor.

Images