JP2009210527A - Fretting corrosion testing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fretting corrosion testing apparatus capable of accurately reproducing the state of progression of fine sliding wear (fretting corrosion). <P>SOLUTION: The fretting corrosion testing apparatus 1 includes a base 12; a first fixture 87; a second fixture 90; a driving part 14; a load sensor 59; and a control unit 20. The first fixture 87 mounts a first test strip. The second fixture 90 is mounted to the base 12 to mount a second test strip. The driving part 14 relatively moves the fixtures 87 and 90, the test strips, along the arrows S. The load sensor 59 detects a frictional force between the test strips. The control unit 20 controls a piezoelectric resonator 15 of the driving part 14 such that the frictional force between the test strips may not exceed a predetermined prescribed value. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fretting corrosion test apparatus for fretting corrosion by moving a test piece or the like imitating a male terminal fitting and a female terminal fitting relative to each other.

  A wire harness routed in an automobile or the like includes an electric wire and a connector. The connector includes an insulating connector housing and a conductive terminal fitting. The connector housing accommodates the terminal fitting. The terminal fitting is attached to the end of the electric wire. For the terminal fitting, a so-called male terminal fitting (hereinafter simply referred to as a male terminal) and a so-called female terminal fitting (hereinafter simply referred to as a female terminal) are used.

  The male terminal has a strip-like or rod-like electrical contact portion. The female terminal includes a cylindrical electrical contact portion and a spring piece that presses the electrical contact portion of the male terminal against the inner surface of the electrical contact portion. When these male terminals and female terminals constitute a wire harness and are routed in an automobile, the strip-shaped or rod-shaped electrical contact portion is inserted into the cylindrical electrical contact portion and the spring piece is strip-shaped or rod-shaped. The electrical contact portions are pressed against the inner surface of the cylindrical electrical contact portion and electrically connected to each other. Further, these male terminals and female terminals are connected in the manner accommodated in the connector housing as described above.

  At this time, when the wire harness is routed in the automobile, the male terminal and the male terminal are moved along the longitudinal direction of the band-like or rod-like electrical contact portion within a minute distance such as 50 μm due to vibration during the running of the automobile. The female terminal may approach or separate from each other. For this reason, a fine sliding wear (fretting corrosion) test apparatus (see, for example, Patent Document 1) is used at the stage of designing and developing the male and female terminals and the connector housing.

The above-mentioned fine sliding wear (fretting corrosion) test apparatus applies a voltage to a high-rigidity piezoelectric vibrator by sliding the test pieces made of metal constituting the terminal fittings in contact with each other. Then, these test pieces are moved relatively, and the state of wear (so-called fretting corrosion) of the test pieces is confirmed. Thus, at the stage of designing and developing the terminal fitting described above, it is possible to check the wear (so-called fretting corrosion) state of the test piece and estimate the wear (so-called fretting corrosion) state of the terminal fitting to be designed and developed. It has been broken. At this time, the test piece is evaluated by measuring the electrical resistance between the test pieces.
JP 2004-325342 A

  When performing the fine sliding wear (fretting corrosion) test using the fretting corrosion test apparatus shown in Patent Document 1 described above, if the fine sliding wear (fretting corrosion) between test pieces proceeds, these tests are performed. The coefficient of friction between the pieces increases. On the other hand, in the fretting corrosion test apparatus disclosed in Patent Document 1 described above, since the piezoelectric vibrator is highly rigid, the test piece is always relatively moved with a constant displacement. For this reason, when the fine sliding wear (fretting corrosion) between the test pieces proceeds, the frictional force acting between these test pieces increases in order to relatively move with a certain displacement.

  When a connector is mounted on an automobile, the terminal fittings in these connectors are subject to vibrations caused by the running of the automobile, etc., so only the aforementioned vibration force acts between the terminal fittings in the connectors. It is. Accordingly, in the above-described fretting corrosion test apparatus, when the fine sliding wear (fretting corrosion) between the test pieces proceeds, the test piece is relatively moved with an excessive force (the above-described frictional force). Therefore, in the fretting corrosion test apparatus disclosed in Patent Document 1, it is particularly difficult to accurately reproduce the state in which fine sliding wear (fretting corrosion) has progressed.

  Accordingly, an object of the present invention is to provide a fretting corrosion test apparatus capable of accurately reproducing a state in which fine sliding wear (fretting corrosion) has progressed.

  In order to solve the above problems and achieve the object, the fretting corrosion test apparatus according to the first aspect of the present invention is configured to bring a first test piece and a second test piece into contact with each other, In the fretting corrosion test apparatus to be moved relatively, the apparatus main body, a first fixing portion for attaching the first test piece, and a second fixing for attaching the second test piece and attached to the apparatus main body. And the drive means attached to the apparatus main body, the first fixing portion, and the second fixing portion are contacted and separated from each other. Detecting means for detecting a frictional force between the first test piece and the second test piece at the time, and a frictional force between the test pieces detected by the detecting means is a predetermined predetermined value. Control the drive means so as not to exceed the value It is characterized a control means, further comprising a that.

  A fretting corrosion test apparatus according to a second aspect of the present invention is the fretting corrosion test apparatus according to the first aspect, wherein the control means has a predetermined frictional force between the test pieces detected by the detection means. The driving means is controlled so that the relative displacement between the test pieces decreases by a second predetermined value.

  According to the first aspect of the present invention, since the control means for controlling the drive means is provided so that the frictional force between the test pieces detected by the detection means does not exceed a predetermined value, It can be prevented that the frictional force exceeds a predetermined value and excessively increases with the progress of the fretting corrosion test.

  According to the second aspect of the present invention, when the frictional force between the test pieces reaches a predetermined value, the control means decreases the relative displacement between the test pieces by a second predetermined value. For this reason, it can prevent reliably that the frictional force between test pieces exceeds a predetermined value.

  As described above, the present invention according to claim 1 can prevent the frictional force between the test pieces from exceeding a predetermined value and excessively increasing with the progress of the fretting corrosion test. Therefore, it is possible to accurately reproduce the state in which the fine sliding wear (fretting corrosion) has progressed while being mounted on an automobile.

  The present invention according to claim 2 can surely prevent the frictional force between the test pieces from exceeding a predetermined value, so that it is mounted on an automobile and the state in which fine sliding wear (fretting corrosion) has progressed is further improved. Can be accurately reproduced.

  An embodiment of the present invention will be described with reference to FIGS. A fretting corrosion test apparatus 1 according to an embodiment of the present invention shown in FIG. 1 and the like has a male terminal fitting (hereinafter referred to as a male terminal) 2 as a first terminal fitting shown in FIG. This is a device that reproduces a case where a female terminal fitting (hereinafter referred to as a female terminal) 3 as a second terminal fitting is connected to each other and the terminals 2 and 3 are subjected to slight sliding wear (fretting corrosion). . The fretting corrosion test apparatus 1 grasps the above-mentioned fine sliding wear (fretting corrosion) situation such as electrical resistance in the design and development stages of the terminals 2 and 3, and grasps the fine sliding wear (fretting corrosion). It is used to help the situation as a resource for designing the terminals 2 and 3.

  The male terminal 2 is obtained by bending a conductive sheet metal. As shown in FIG. 9, the male terminal 2 is integrally provided with a tab 4 as a first electrical contact portion, a wire connecting portion 5, and a connecting portion 6. The tab 4 is formed in a strip shape (flat plate shape). The tab 4 is formed in a band shape and is inserted into a later-described cylinder portion 8 of the female terminal 3 to be electrically connected to the female terminal 3.

  The electric wire connecting portion 5 includes a plurality of caulking pieces 7 for caulking the electric wires. The wire connecting portion 5 is electrically connected to the core wire of the electric wire by the caulking piece 7 caulking the electric wire. The connecting portion 6 is formed in a cylindrical shape, and electrically connects the tab 4 and the wire connecting portion 5. In the male terminal 2, the tab 4, the connecting portion 6, and the wire connecting portion 5 are sequentially connected along the longitudinal direction of the tab 4.

  As shown in FIG. 11, the male terminal 2 having the above-described configuration is housed in a female connector housing 101 (hereinafter referred to as a female housing) 101 as a first connector housing.

  The female terminal 3 is obtained by bending a conductive sheet metal. As shown in FIG. 10, the female terminal 3 is integrally provided with a cylindrical portion 8 as a second electrical contact portion, a spring piece 9, and a wire connecting portion 10. The cylinder part 8 is formed in a cylindrical shape. The spring piece 9 is formed in a band shape and is accommodated in a bent shape in the cylindrical portion 8. The spring piece 9 is elastically deformable. The spring piece 9 pushes the tab 4 of the male terminal 2 that has entered the cylindrical portion 8 toward the inner surface of the cylindrical portion 8. The spring piece 9 pushes the tab 4 toward the inner surface of the tube portion 8, and the tube portion 8 is electrically connected to the male terminal 2.

  The electric wire connecting portion 10 includes a plurality of caulking pieces 11 for caulking the electric wires 103 (shown in FIG. 11). The wire connecting portion 10 is electrically connected to the core wire of the electric wire 103 by the caulking piece 11 caulking the electric wire 103 (shown in FIG. 11). In the female terminal 3, the tubular portion 8 and the wire connecting portion 10 are coupled to each other along the longitudinal direction of the spring piece 9.

  As shown in FIG. 11, the female terminal 3 having the above-described configuration is accommodated in a male connector housing (hereinafter referred to as a male housing) 102 as a second connector housing. The male housing 102 is fitted with the female housing 101.

  The housings 101 and 102 are accommodated in the housings 101 and 102 and the housings 101 and 102 are fitted to each other. As shown in FIG. 11, the tab 4 enters the cylindrical portion 8 and the spring piece 9 connects the tab 4 to the cylindrical portion 8. The male terminal 2 and the female terminal 3 are connected to each other.

  As shown in FIG. 11, the fretting corrosion test apparatus 1 performs the first test shown in FIGS. 2 and 3 in order to reproduce the fine sliding wear (fretting corrosion) generated between the terminals 2 and 3 connected to each other. This is a device that reproduces and grasps the state of fine sliding wear (fretting corrosion) of the test pieces 81 and 82 by bringing the piece 81 and the second test piece 82 into contact with each other and relatively moving them. .

  The first test piece 81 is similar to the male terminal 2 described above, and is made of a sheet metal similar to the male terminal 2 and is formed in a flat plate shape. The second test piece 82 is similar to the female terminal 3 described above, and is made of a sheet metal similar to the female terminal 3.

  The second test piece 82 is integrally provided with a bowl-shaped collar 83 and a pair of flanges 84 extending outward from both edges of the collar 83. A protrusion 85 is provided on the bottom 83 a of the flange 83. As shown in FIG. 3, the second test piece 82 has a protrusion 85 in contact with the first test piece 81. The protrusion 85 imitates a portion that contacts the tab 4 of the spring piece 9 of the female terminal 3. As shown in FIG. 3, the contact C <b> 1 where the projection 85 of the second test piece 82 and the first test piece 81 are in contact is similar to the contact C between the terminals 2 and 3 described above.

  In the fretting corrosion test apparatus 1 of the present embodiment, the first test piece 81 and the projection 85 of the second test piece 82 are brought into contact with each other, and the surface of the first test piece 81 is placed along an arrow S described later. Thus, the test pieces 81 and 82 are relatively moved along the arrow S. Then, the fretting corrosion test apparatus 1 causes fretting corrosion between the test pieces 81 and 82. Then, by measuring the electrical resistance between the test pieces 81 and 82, the state of fine sliding wear (fretting corrosion) of the test pieces 81 and 82, that is, the terminals 2 and 3, is grasped.

  That is, the fretting corrosion test apparatus 1 measures the electrical resistance between the test pieces 82 and 83 when the test pieces 82 and 83 are relatively moved within a predetermined distance a predetermined number of times. As a result, the quality of the design of the terminals 2 and 3 is determined.

  As shown in FIG. 1, the fretting corrosion test apparatus 1 includes a base 12 as an apparatus main body, a temperature bath 13, a drive unit 14 as drive means, a support table 16, and a first attached to the support table 16. A first fixing tool 17 as a fixing part, a second fixing tool 18 as a second fixing part, a laser displacement meter 58 as a detecting means, a measuring part 19 as a measuring means, and a detecting means Load sensor 59, connecting member 62, and control device 20 as control means.

  The base 12 includes a base body 21 that is installed on a floor of a factory or the like, and a storage table 22. The accommodation table 22 is accommodated in the temperature chamber 13 and installed on the base body 21. The accommodation table 22 is fixed to the base body 21.

  The temperature vessel 13 is formed in a box shape with the inside sealed. The temperature vessel 13 accommodates the support table 16, the first and second fixtures 17 and 18, the accommodation table 22, the load sensor 59, and the like. The temperature vessel 13 is configured so that the temperature of the internal space is maintained at a predetermined temperature.

  The drive unit 14 includes a piezoelectric vibrator 15 as a first drive means, a stepping motor 53 as a second drive means, and a connecting piece 54 as a connecting means for connecting them.

  The piezoelectric vibrator 15 is provided between the connecting piece 54 and the support table 16 and connects them. That is, the piezoelectric vibrator 15 connects the base body 21 of the base 12 and the first fixing member 17 to each other via the support table 16, the connecting piece 54, the stepping motor 53, and the like.

  As shown in FIG. 8, the piezoelectric vibrator 15 includes a main body portion 48 and a pair of pressing plates 46. The main body 48 includes a cylindrical case 41 and a subassembly 42 accommodated in the case 41. The subassembly 42 includes a piezoelectric element 43, a pair of electrodes 44, and a pair of insulating plates 45. The piezoelectric element 43 is formed in a disk shape. The piezoelectric element 43 is made of a material having high rigidity and piezoelectricity such as lead titanate (PT), lead zirconate titanate (PZT), and quartz.

  The pair of electrodes 44 are each formed in a disk shape. The pair of electrodes 44 are superimposed on both surfaces of the piezoelectric element 43, respectively. The pair of electrodes 44 are in contact with the piezoelectric element 43 and sandwich the piezoelectric element 43 therebetween. A lead wire 47 or the like is connected to each electrode 44. The lead wire 47 is connected to the power source 49. The pair of insulating plates 45 are each formed in a disk shape. The pair of insulating plates 45 are overlaid on the electrodes 44. The insulating plates 45 sandwich the electrodes 44 between each other.

  The pressing plate 46 is integrally provided with a disc portion 50 and a cylindrical portion 51 as an output portion. The disc portion 50 and the column portion 51 are arranged coaxially with each other. The disc portion 50 is stacked on the insulating plate 45 and accommodated in the case 41. The cylindrical part 51 protrudes outside the case 41. The pair of pressing plates 46 sandwich the insulating plate 45 between them. The cylindrical portion 51 of one pressing plate 46 is connected to the connecting piece 54.

  For this reason, the main body 48 is attached to the base main body 21 of the base 12 via the columnar part 51 of the one pressing plate 46, the connecting piece 54 and the stepping motor 53. An output shaft 63 (shown in FIG. 8 or the like) is attached to the cylindrical portion 51 of the other pressing plate 46. The cylindrical portion 51 of the other pressing plate 46 is connected to the support table 16 via an output shaft 63 and a connecting member 62.

  For this reason, the cylindrical portion 51 of the other pressing plate 46 is attached (connected) to the first fixture 17 via the support table 16. Further, the disc portion 50 and the column portion 51 of the pair of pressing plates 46 are coaxial with each other. Further, the cylindrical portion 51 is coaxial with the output shaft 63.

  The piezoelectric element 43 of the piezoelectric vibrator 15 is distorted by being applied between the pair of electrodes 44 by a power source 49 or the like, and vibrates the pressing plate 46 through the insulating plate 45 or the like. When the piezoelectric element 43 is applied between the pair of electrodes 44 by a power source 49 or the like, the piezoelectric element 43 has a predetermined frequency along the central axis P1 (indicated by a one-dot chain line in FIG. 8) of the cylindrical portion 51 of the pressing plate 46. Vibrate. The piezoelectric element 43 projects the cylindrical portion 51 of the pressing plate 46 from the main body portion 48 along the central axis P1.

  The piezoelectric element 43 projects the cylindrical portion 51 of the pressing plate 46, particularly the cylindrical portion 51, from the main body portion 48 along the central axis P1, so that the piezoelectric vibrator 15 causes the support table 16 to move to the central axis P1 at the first frequency. (Along arrow K in FIG. 8). In this way, the piezoelectric vibrator 15 moves the first fixing member 17 closer to or away from (the contact of) the second fixing member 18 via the support table 16 at the first frequency, and is male at the first frequency. The terminal 2 is moved closer to or away from (fitted to) the female terminal 3.

  A lead wire 47 is connected to the power source 49. The power source 49 is connected to the control device 20 via an interface (shown as I / F in FIG. 1 and hereinafter referred to as I / F) 24. The power source 49 is applied between the pair of electrodes 44 via the lead wire 47 based on a command from the control device 20.

  The stepping motor 53 includes a second main body portion 57 and a screw shaft 55 as an output shaft. The stepping motor 53 is connected to the control device 20 via the I / F 24 or the like. The second main body portion 57 is fixed to the base 12. The screw shaft 55 is supported by the second main body 57 so as to be rotatable about its axis P3 (indicated by a one-dot chain line in FIG. 1).

  The stepping motor 53 connects the piezoelectric vibrator 15 and the base 12 to each other via a connecting piece 54. The stepping motor 53 rotates the screw shaft 55 about the shaft core P3, so that the support table 16 extends along the shaft core P3 at a second frequency different from the first frequency and lower than the first frequency. The first fixture 87 is brought into contact with and separated from the second fixture 90 via the.

  The connecting piece 54 is slidably supported by the base 12 along the direction in which the first fixing member 17 contacts and separates from the second fixing member 18. The connecting piece 54 is provided with a screw hole 56. A screw shaft 55 is screwed into the screw hole 56. In addition, the cylindrical portion 51 of one pressing plate 46 is connected to the connecting piece 54.

  The connecting piece 54 connects the piezoelectric vibrator 15 and the stepping motor 53 in a state where the central axis P1 of the cylindrical portion 51 of the pressing plate 46 and the axis P3 of the screw shaft 55 of the stepping motor 53 are coaxial with each other. . That is, the central axis P1 and the axis P3 are located on the same line. Further, when the stepping motor 53 is driven, the connecting piece 54 slides along the central axis P1 and the axis P3.

  The driving unit 14 drives one of the piezoelectric vibrator 15 and the stepping motor 53 to move the first fixing member 17 along the arrow S (direction parallel to the central axes P1 and P3). The two fixtures 18 are brought into contact with and separated from each other. Further, the drive unit 14 is attached to the base 12 by attaching the stepping motor 53 to the base main body 21.

  The support table 16 is accommodated in the temperature bath 13. The support table 16 is supported by the accommodation table 22 so as to be movable along the arrow S. A first fixture 17 is attached to the support table 16.

  The first fixture 87 is supported by the support table 16 so as to be movable along the arrow S by a known bearing 86 (shown in FIGS. 4 to 6) or the like. As shown in FIG. 5, the first fixture 87 includes a main body portion 88 and a plurality of pressing members 89. The main body 88 is supported on the support table 16 along the arrow S by a bearing 86 or the like. The main body portion 88 supports the first test piece 81 with the surface along the vertical direction.

  The holding member 89 is attached to the main body portion 88 with a screw or the like, and the distance from the main body portion 88 can be changed by adjusting the screwing amount of the screw. The pressing member 89 presses and fixes the first test piece 81 to the main body portion 88 by screwing a screw. A first test piece 81 is attached to the first fixture 87.

  The 2nd fixing tool 90 as a 2nd fixing | fixed part is attached to the accommodation table 22, as shown in FIG. As shown in FIGS. 1 and 4, the second fixture 90 includes a rotation support portion 91, a swing arm 92, and a test piece support portion 93 (shown in FIG. 5).

  The rotation support portion 91 includes an attachment portion 94 attached to the accommodation table 22 and a pivot 95. The longitudinal direction of the pivot 95 is along the vertical direction. The pivot 95 is supported by the mounting portion 94 so as to be rotatable about its axis. In addition, the other end of the swing arm 92 (described later) is urged to the pivot 95 with a predetermined force toward the first fixture 87, that is, the second test piece 82 is directed toward the first test piece 81. A biasing means such as a spring (not shown) that biases with a predetermined force is attached.

  One end of the swing arm 92 is fixed to the pivot 95 of the rotation support portion 91. The test piece support portion 93 is attached to the other end portion of the swing arm 92. The test piece support part 93 sandwiches and fixes the second test piece 82 in a state where the projection 85 faces the first fixing tool 87. A second test piece 82 is attached to the second fixture 90.

  The laser displacement meter 58 includes a reflecting member 60 and a light emitting / receiving unit 61. The reflection member 60 is attached to the support table 16 and is erected upward from the support table 16.

  The light emitting / receiving unit 61 is attached to the base main body 21 of the base 12 as the apparatus main body via the second main body 57 of the stepping motor 53. The light emitting / receiving unit 61 irradiates a laser toward the reflecting member 60 and receives the laser reflected by the reflecting member 60.

  The light emitting / receiving unit 61 irradiates and receives a laser beam and measures the displacement (movement amount) of the first fixture 87, that is, the displacement (movement amount) of the first test piece 82. The light emitting / receiving unit 61 is connected to the control device 20 via the amplifier 23 and the I / F 24. The light emitting / receiving unit 61, that is, the laser displacement meter 58, calculates the displacement amount (movement amount) of the first fixture 87 based on the vibration of the support table 16, that is, the displacement amount (movement amount) of the first test piece 82. To the control device 20 via

  The amplifier 23 is connected to the control device 20 via the I / F 24. Information relating to the displacement of the support table 16, that is, the first fixture 87 output from the laser displacement meter 58 is amplified by the amplifier 23 and input to the control device 20.

  The measurement unit 19 includes a power supply unit 25 and a voltmeter 26. The power supply unit 25 includes a positive terminal and a negative terminal. The positive terminal of the power supply unit 25 is electrically connected to the second test piece 83 via the second fixture 90. The negative terminal of the power supply unit 25 is electrically connected to the first test piece 82 via the first fixture 87. The power supply unit 25 applies a predetermined current value between the test pieces 82 and 83 via the first fixture 87 and the second fixture 90 based on a command from the control device 20.

  The voltmeter 26 has a positive terminal and a negative terminal. The positive terminal of the voltmeter 26 is electrically connected to the second test piece 83 via the second fixture 90. The negative terminal of the voltmeter 26 is electrically connected to the first test piece 82 via the first fixture 87. The voltmeter 26 measures the voltage between the test pieces 82 and 83 via the first fixture 87 and the second fixture 90 based on a command from the control device 20. In the measuring unit 19 having the above-described configuration, the power supply unit 25 applies the voltage between the test pieces 82 and 83 and the voltmeter 26 measures the voltage between the test pieces 82 and 83 based on a command from the control device 20. .

  The load sensor 59 is provided between the main body 88 of the first fixture 87 and the support table 16. The load sensor 59 is attached to the main body 88 of the first fixture 87 and the support table 16. The load sensor 59 includes a piezoelectric element such as quartz. The piezoelectric element of the load sensor 59 detects the frictional force between the first test piece 81 and the second test piece 82 along the arrow S when the first fixture 87 moves along the arrow S. Then, a signal corresponding to the detected friction force is output to the control device 20 via the amplifier 23 and the I / F 24.

  As shown in FIG. 7, the connecting member 62 is made of metal or the like and has a rectangular planar shape. The connecting member 62 integrally includes a first connecting portion 66 and a second connecting portion 67 provided at both ends, and a weakened portion 68 provided between the connecting portions 66 and 67, that is, in the central portion. Yes.

  As shown in FIG. 7, the first connecting portion 66 is fixed to the output shaft 63, that is, the driving portion 14 by bolts and nuts not shown. As shown in FIG. 7, the second connecting portion 67 is fixed to the support table 16 with a bolt or the like (not shown). The connecting member 62 connects the drive unit 14 and the support table 16. When the drive unit 14 and the support table 16 are coupled, the longitudinal direction of the coupling member 62 is parallel to the arrow S described above.

  A plurality of notches 72 are formed in the fragile portion 68. The cutout 72 cuts out a base material constituting the connection member 62 from the side edge of the connection member 62 toward the center. Thus, the notch 72 is formed in a concave shape from the side edge of the connecting member 62. By forming the cutout 72 in this way, the fragile portion 68 is easily elastically deformed. That is, the fragile portion 68 can be elastically deformed.

  The elastic coefficient in the longitudinal direction, that is, the arrow S direction of the connecting member 62 having the above-described configuration is such that the terminals 2 and 3 housed in the housings 101 and 102 shown in FIG. The elastic modulus is equivalent to the combined housing 101 and 102. That is, the elastic coefficient in the arrow S direction of the connecting member 62 is equal to the elastic coefficient of the terminals 2 and 3 and the housings 101 and 102 in the state shown in FIG.

  Note that the elastic modulus in this specification is equivalent means that the elastic coefficient of the connecting member 62 is equal to the elastic coefficients of the terminals 2 and 3 and the housings 101 and 102, and that these elastic coefficients are substantially equal. Is shown. The elastic modulus being substantially equal means that the difference between these elastic coefficients is the elastic deformation caused by the above-described difference in elastic coefficient compared to the relative displacement between the first fixing device 87 and the second fixing device 90 described above. This shows that the difference in quantity is so small that it does not cause any problems in the fretting corrosion test.

  The control device 20 is a computer equipped with a well-known RAM, ROM, CPU, etc., and is connected to the drive unit 14, power source 49, amplifier 23, measurement unit 19, load sensor 59, etc. Take control of the whole. The control device 20 is connected to the power supply unit 25 and the voltmeter 26 via a bidirectional bus 27 and the like. The control device 20 is connected to the I / F 24 via a bidirectional bus 27 or the like. The I / F 24 is connected to the power source 49, the amplifier 23, and the stepping motor 53.

  The control device 20 drives one of the piezoelectric vibrator 15 and the stepping motor 53 based on a program stored in advance. When driving the piezoelectric vibrator 15, the control device 20 applies a power source 49 between the electrodes 44 of the piezoelectric vibrator 15 via the I / F 24 to move the support table 16, that is, the first fixture 87 to the first position. The two fixing tools 90 are brought into contact with and separated from each other.

  In other words, the first fixture 87 and the second fixture 90 move relatively along the arrow S in FIG. Of course, the arrow S is in the direction in which the first fixing portion 87 and the second fixing device 90 are in contact with and away from each other. The amplitude for this is a minute distance such as 50 μm.

  Then, the control device 20 controls the application state between the electrodes 44 of the power source 49 based on the information about the displacement of the support table 16 input from the laser displacement meter 58 via the amplifier 23 or the like, and thereby the piezoelectric vibrator 15. The piezoelectric element 43 is vibrated at a predetermined frequency, amplitude, or the like. When the first fixture 87 is brought into contact with and separated from the second fixture 90 once by vibration of one of the piezoelectric vibrator 15 and the stepping motor 53, the control device 20 causes the power supply unit 25 of the measurement unit 19 to be separated. Is applied between the test pieces 81 and 82, and the voltmeter 26 is caused to measure the voltage between the test pieces 81 and 82.

  A signal corresponding to the voltage between the test pieces 81 and 82 is transmitted from the voltmeter 26 to the control device 20 via the bidirectional bus 27. The control device 20 obtains the resistance value between the test pieces 81 and 82 from the voltage from the voltmeter 26 and the current value applied by the power supply unit 25. Then, the control device 20 again drives one of the piezoelectric vibrator 15 and the stepping motor 53 to vibrate the piezoelectric element 43 and relatively moves the test pieces 81 and 82 along the arrow S. The electrical resistance value between these test pieces 81 and 82 is obtained.

  Further, the load value (frictional force) detected by the load sensor 59 while the stepping motor 53 or the piezoelectric vibrator 15 is driven is input to the control device 20 via the amplifier 23 and the I / F 24. .

  Thus, the control device 20, that is, the fretting corrosion test apparatus 1 moves the test pieces 81 and 82 relative to each other along the arrow S, and measures the electrical resistance value between the test pieces 81 and 82. Further, the control device 20 causes the measurement piece 19 to move the test pieces 81 and 82 each time the piezoelectric element 43 of the piezoelectric vibrator 15 is vibrated once, that is, whenever the test pieces 81 and 82 are relatively moved along the arrow S. The electrical resistance value between the test pieces 81 and 82 may be measured by the measurement unit 19 each time the test pieces 81 and 82 are moved relatively along the arrow S a plurality of times. The value may be measured. Immediately after the start of the fretting corrosion test, the control device 20 causes the measuring unit 19 to measure the electrical resistance value between the test pieces 81 and 82 each time the test pieces 81 and 82 are relatively moved along the arrow S. It is desirable that the interval of measuring the electrical resistance value between the test pieces 81 and 82 (the number of times the test pieces 81 and 82 are brought into contact with and separated from each other during the measurement of the resistance) is gradually increased with the elapsed time of the test. Is desirable.

  For example, when the test pieces 81 and 82 are relatively moved along the arrow S for the first time to the tenth time, it is desirable to measure the electrical resistance value between the test pieces 81 and 82 every time. When the test pieces 81 and 82 are relatively moved along the arrow S from the 10th to the 100th time, it is desirable to measure the electrical resistance value between the test pieces 81 and 82 every several times. When the test pieces 81 and 82 are relatively moved along the arrow S from the 100th to the 1000th time, it is desirable to measure the electrical resistance value between the test pieces 81 and 82 every several tens of times. When the test pieces 81 and 82 are moved relatively along the arrow S for the 1000th time, it is desirable to measure the electrical resistance value between the test pieces 81 and 82 every 100 times.

  Further, the control device 20 may be connected to a known printer device or monitor via the bidirectional bus 27 or the like. In this case, the above-described measurement result (electrical resistance value between the test pieces 81 and 82) is output from the printer device or the monitor.

  Further, in the fretting corrosion test apparatus 1 described above, as the number of times the test pieces 81 and 82 are relatively moved along the arrow S increases, the frictional force between the test pieces 81 and 82 gradually increases. . In the control device 20 described above, the load value (frictional force) detected by the load sensor 59 during the relative movement of the test pieces 81 and 82 along the arrow S by the piezoelectric vibrator 15 is as shown in FIG. When the predetermined predetermined value V shown in FIG. 5 is reached, the voltage applied to the piezoelectric vibrator 15 is reduced, and the amplitude of the piezoelectric vibrator 15, that is, the relative displacement between the test pieces 81 and 82 is reduced to a second predetermined value. Decrease value V2.

  Note that the predetermined value V is the maximum friction that acts on the contact C when the terminals 2 and 3 are housed in the housings 101 and 102 and are mounted on the automobile due to vibrations during the running of the automobile. It is desirable to use force. Thus, when the frictional force between the test pieces 81 and 82 detected by the load sensor 59 reaches the aforementioned predetermined value V, the control device 20 determines that the relative displacement between the test pieces 81 and 82 is the second predetermined value. The piezoelectric vibrator 15 is controlled so that V2 decreases. Then, the control device 20 decreases the relative displacement between the test pieces 81 and 82 by a second predetermined value V2 as shown by a solid line in FIG. 12, and as shown by a solid line in FIG. The piezoelectric vibrator 15 is controlled so that the frictional force between the test pieces 81 and 82 detected by the load sensor 59 does not exceed a predetermined value V.

  When performing the fretting corrosion test on the test pieces 81 and 82 using the fretting corrosion test apparatus 1 having the above-described configuration, the first test piece 81 is attached to the first fixture 87 and the second fixture 90 is attached. A second test piece 82 is attached to the. When attaching the second test piece 82 to the second fixture 90, the swing arm 92 is rotated along the arrow M in FIG.

  The fixing tools 87 and 90, the support table 16, and the storage table 22 are inserted into the temperature bath 13 to fix the storage table 22 to the base body 21. A connecting member 62 is attached to the support table 16 and the output shaft 63. Then, the temperature in the temperature chamber 13 is maintained at a predetermined temperature, and the stepping motor 53 or the piezoelectric vibrator 15 is driven according to the pattern stored in advance in the control device 20 to thereby generate the first fixture 87. That is, the first test piece 81 is moved by a distance of 50 μm, for example. In this way, the first test piece 81 is moved to the second test piece 82 along the arrow S, and the test pieces 81 and 82 are relatively moved.

  While the test pieces 81 and 82 are vibrating, the laser displacement meter 58 measures the relative displacement of the support table 16, that is, the test pieces 81 and 82, and the load sensor 59 is used between the test pieces 81 and 82, that is, the contact C1. Measure the friction force. After the test pieces 81 and 82 are brought into contact with and separated from (relatively moved), the electrical resistance value between the test pieces 81 and 82 is measured using the measuring unit 19 or the like. In this manner, the test pieces 81 and 82 are relatively moved along the arrow S a predetermined number of times, and the electrical resistance value between the test pieces 81 and 82 is measured.

  According to this embodiment, since the control device 20 that controls the piezoelectric vibrator 15 is provided so that the frictional force between the test pieces 81 and 82 detected by the load sensor 59 does not exceed the predetermined value V, the test is performed. It can be prevented that the frictional force between the pieces 81 and 82 exceeds a predetermined value V and excessively increases with the progress of the fretting corrosion test. Therefore, it is possible to accurately reproduce the state in which the fine sliding wear (fretting corrosion) has progressed while being mounted on an automobile.

  When the frictional force between the test pieces 81 and 82 reaches a predetermined value V, the control device 20 decreases the relative displacement between the test pieces 81 and 82 by a second predetermined value V2. For this reason, it is possible to reliably prevent the frictional force between the test pieces 81 and 82 from exceeding the predetermined value V. Therefore, the state in which the fine sliding wear (fretting corrosion) has progressed can be more accurately reproduced.

  In the above-described embodiment, the test pieces 81 and 82 are relatively moved to measure the electrical resistance value between the test pieces 81 and 82. In the present invention, the actual terminals of the female terminal 2 and the male terminal 3 are measured. May be used to conduct a fretting corrosion test.

  Further, in the above-described embodiment, when the frictional force between the test pieces 81 and 82 reaches the predetermined value V, the amplitude of the piezoelectric vibrator 15 is decreased by the second predetermined value V2, and the piezoelectric vibrator 15 performs the piezoelectric test during the fretting corrosion test. The amplitude of the vibrator 15 is decreased step by step. However, in the present invention, during the fretting corrosion test, when the frictional force between the test pieces 81 and 82 becomes a predetermined value V, the amplitude of the vibrator 15 may be gradually decreased.

  Further, in the present invention, when the test pieces 81 and 82 are relatively displaced along the arrow S by the stepping motor 57, the stepping motor 57 is changed when the frictional force between the test pieces 81 and 82 becomes a predetermined value V. The relative displacement between the test pieces 81 and 82 may be reduced by the second predetermined value V2.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

It is explanatory drawing which shows the structure of the outline of the fretting corrosion test apparatus concerning one Embodiment of this invention. It is a perspective view which shows the test piece with which a fine sliding abrasion test is performed with the fretting corrosion test apparatus shown by FIG. FIG. 3 is a cross-sectional view showing a state where the test pieces shown in FIG. 2 are in contact with each other during a fine sliding wear test. It is explanatory drawing which shows the 1st and 2nd fixing tool etc. of the fretting corrosion test apparatus shown by FIG. It is explanatory drawing which shows the 1st fixing tool shown in FIG. 4, a 2nd fixing tool, etc. FIG. It is a top view which shows the 1st fixing tool, the 2nd fixing tool, etc. which were shown by FIG. It is the perspective view which looked at the 1st fixing tool shown by FIG. 4 from the back side. It is sectional drawing of the piezoelectric vibrator of the fretting corrosion test apparatus shown by FIG. It is a perspective view which shows the male terminal by which fine sliding wear is reproduced with the test piece shown by FIG. It is a perspective view which shows the female terminal by which fine sliding wear is reproduced with the test piece shown by FIG. It is sectional drawing which shows the state which connected the male terminal shown by FIG. 9, and the female terminal shown by FIG. 10, and these terminals were accommodated in the housing. It is explanatory drawing which shows the change of the frictional force between the test pieces of the fretting corrosion test apparatus shown by FIG. 1, and the relative displacement between test pieces.

Explanation of symbols

1 Fretting corrosion test equipment 12 Base (equipment main unit)
14 Drive unit (drive means)
20 Control device (control means)
59 Load sensor (detection means)
81 1st test piece 82 2nd test piece 87 1st fixing tool (1st fixing | fixed part)
90 Second fixture (second fixture)
V predetermined value V2 second predetermined value

Claims (2)

In a fretting corrosion test apparatus in which a first test piece and a second test piece are brought into contact with each other and these test pieces are moved relatively,
The device body;
A first fixing part for attaching the first test piece;
A second fixing portion attached to the apparatus main body and attached to the second test piece;
Driving means attached to the apparatus main body and moving the first fixing portion to and away from the second fixing portion;
Detecting means for detecting a frictional force between the first test piece and the second test piece when the first fixed portion and the second fixed portion are brought into contact with and separated from each other;
Control means for controlling the drive means so that the frictional force between the test pieces detected by the detection means does not exceed a predetermined value,
A fretting corrosion testing apparatus characterized by comprising:   When the frictional force between the test pieces detected by the detection means reaches a predetermined value, the control means is configured so that the relative displacement between the test pieces decreases by a second predetermined value. 2. The fretting corrosion test apparatus according to claim 1, wherein the driving means is controlled.

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