JP2015219092A - Scratch test machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scratch test machine excellent in the linearity of variation of an indentation load to a scratch distance without requiring a mechanism which is an essential component in a conventional test machine and cancels the weight of a device coupled with an indenter.SOLUTION: A scratch test machine comprises: a base 10; a support 20 for supporting a test piece on the horizontal surface of the base 10 in the state of standing in the vertical direction; an indenter 30 pushed into the surface of the test piece supported by the support 20; a first drive mechanism 40 for moving the indenter 30 in a first horizontal direction on the tip side on which the support 20 is positioned, in order to contact the tip of the indenter 30 with the surface of the test piece supported by the support 20 to push the indenter; and a second drive mechanism 50 for moving the support 20 in a second horizontal direction orthogonal to the first horizontal direction in order to form a scratch on the surface of the test piece supported by the support 20.

Description

  The present invention relates to a scratch testing machine for obtaining scratch characteristics of the surface of a test piece.

  In a conventional scratch testing machine, a scratch (scratch) is formed by moving an indenter in a horizontal direction while applying a vertical load to the surface of a test piece placed on a horizontal surface of a base. (For example, refer to Patent Document 1 and Patent Document 2).

In the so-called load increasing type scratch tester, the load (indentation load) applied from the tip of the indenter to the surface of the test piece is continuously increased according to the horizontal movement distance (scratch distance) of the indenter. .
Here, it is ideal that the indentation load on the surface of the test piece increases linearly as the scratch distance increases (the scratch distance and the indentation load are in a proportional relationship).

US Pat. No. 7,302,831 JP-A-7-190913

However, the conventional scratch tester has the following problems.
For example, in a load increasing type scratch tester, only the load generated by the load generating device needs to be applied to the surface of the test piece via the indenter. In particular, since the load generated by the load generator is small at the start of indenter transition (at the start of the test), the test results are greatly affected when other loads are applied. However, the indenter is connected to a device for applying a predetermined load to the surface of the test piece (the load generating device and the load sensor described above), and these devices are located above the indenter. The weight (self-weight) of such a device is not applied to the surface of the test specimen as a load so that the weight is offset (for example, a floating equipped with the upper link arm 140 and the counterweight 160 shown in FIG. 4 of Patent Document 1) Mechanism) is required. As a result, the number of parts constituting the testing machine increases and the structure becomes complicated.

  In addition, by operating a mechanism that cancels the weight of the device connected to the indenter, the weight is surely canceled (without excess or shortage), and the load applied to the surface of the specimen when performing a scratch test can be reduced. It is extremely difficult to use only the indentation load generated by the load generator. Here, when the force generated to cancel is insufficient, a load not set at the start of the test is applied to the specimen surface, while the force generated to cancel is excessive. The indenter is separated from the surface of the test piece at the start of the test, and the indentation load becomes smaller than the set value during the test. When the scratch test is performed in such a state, good results cannot be obtained.

  Furthermore, in the conventional load increasing type scratch tester, the indentation load applied to the surface of the test piece does not increase linearly as the horizontal movement distance (scratch distance) of the indenter with respect to the surface of the test piece increases. For example, the pushing load when the scratch behavior changes cannot be immediately obtained from the scratch distance.

The present invention has been made based on the above situation.
A first object of the present invention is to provide a scratch testing machine that does not require a mechanism for canceling the weight of a device connected to an indenter, which is an essential component in a conventional testing machine.
The second object of the present invention is to provide a scratch testing machine excellent in linearity of change in indentation load with respect to the scratch distance.

(1) A scratch testing machine of the present invention comprises a base,
A support base for supporting the test piece in a vertical direction (z direction) on the horizontal surface of the base;
An indenter pushed into the surface of the test piece supported by the support,
The indenter is brought into contact with the surface of the test piece supported by the support base, and the indenter is moved in the first horizontal direction (y direction) to the front end side where the support base is located in order to push further. A first drive mechanism
A second drive mechanism for moving the support table or the indenter in a second horizontal direction (x direction) perpendicular to the first horizontal direction in order to form a scratch on the surface of the test piece supported by the support table; ,
It is characterized by comprising.

  According to the scratch testing machine having such a configuration, the first drive mechanism for moving the indenter toward the first horizontal end, and the second drive mechanism for moving the support base or the indenter in the second horizontal direction. Since the load due to the weight (self-weight) of the first drive mechanism is not applied to the surface of the test piece that is supported in the vertical direction, the weights of the first drive mechanism and the second drive mechanism are offset. No mechanism is required.

  In addition, when the tip of the indenter is in contact with the surface of the test piece that is supported in a vertically standing state, a load due to the weight (self-weight) of the first drive mechanism is applied to the surface of the test piece. Therefore, when performing the scratch test, only the indentation load generated by the first drive mechanism can be applied to the surface of the test piece.

  Further, as is apparent from the results of Examples described later, the load increasing type scratch testing machine having such a configuration is used for the scratch distance (relative movement distance between the test piece surface and the indenter). Excellent in linearity of change of indentation load (load applied to the test piece surface by the indenter).

(2) In the scratch testing machine of the present invention, the first drive mechanism includes a motor fixed to the base,
A screw shaft of a ball screw connected to the motor and extending to the first horizontal tip side;
A movable part that moves to the tip side in the first horizontal direction together with the nut of the ball screw;
A slide part that is slidably attached to the rear end side in the first horizontal direction relative to the movable part at the front end side of the movable part, and an indenter is attached to the front end;
Located between the movable portion and the slide portion, the slide portion is disposed along the first horizontal direction so as to prevent the slide portion from sliding toward the rear end side in the first horizontal direction with respect to the movable portion. Coil spring and
The second drive mechanism moves the support base in a second horizontal direction in conjunction with the movement of the movable portion of the first drive mechanism.

According to the scratch testing machine having such a configuration, the movable part and the slide part are moved by the ball screw mechanism constituting the first drive mechanism until the tip of the indenter comes into contact with the surface of the test piece supported by the support base. Moves integrally to the front end side in the first horizontal direction.
Then, when the tip of the indenter comes into contact with the surface of the test piece supported by the support base, and the movement of the slide portion to the first horizontal direction is restricted, the screw shaft of the ball screw is further rotated. The sliding portion slides toward the rear end side in the first horizontal direction with respect to the movable portion against the biasing force of the coil spring, so that only the movable portion moves to the front end side in the first horizontal direction.
At this time, the coil spring is compressed, and the indentation load applied to the surface of the test piece of the indenter attached to the tip of the slide part increases as the moving distance of the movable part (the number of rotations of the screw shaft of the ball screw) increases. To do.

(3) In the scratch testing machine of (2), the first drive mechanism is
A guide rail for the movable part fixed on the horizontal surface of the base so as to extend in the first horizontal direction;
The two coil springs are preferably disposed on the same horizontal plane with the central axis of the indenter interposed therebetween.

  According to the scratch testing machine having such a configuration, the tip of the indenter during the test can be linearly moved toward the tip side in the first horizontal direction, and is supported on the support stand in a state where it is erected in the vertical direction. The first horizontal pushing load can be reliably applied to the surface of the test piece.

(4) In the scratch tester according to (2) or (3), it is preferable that the first drive mechanism includes a limit sensor and a limit switch that limit a moving range of the movable part.

(5) In the scratch tester according to (2) to (4), the scratch tester includes first measuring means for measuring the indentation load applied to the surface of the test piece supported by the support base. preferable.

(6) In the scratch testing machine of (5), the moving distance of the movable part or the rotation of the screw shaft of the ball screw after the tip of the indenter comes into contact with the surface of the test piece supported by the support base And the measured value of the indentation load applied to the surface of the test piece; based on the measurement result, the moving distance of the movable part corresponding to a predetermined maximum load or the screw shaft The predetermined maximum load is applied to the test piece when the support table moves in the second horizontal direction and reaches a predetermined scratch distance (usually the position of the support table at the end of the test). As described above, it is preferable to include means for controlling the first drive mechanism and the second drive mechanism.

  According to the scratch testing machine having such a configuration, the pushing load when the predetermined scratch distance is reached (at the end of the test) can be set to the predetermined maximum load.

(7) In the scratch tester according to (2) to (6), the second driving mechanism measures the frictional force between the test piece that moves in the second horizontal direction together with the support base and the indenter. It is preferable to include two measuring means.

  According to the scratch testing machine having such a configuration, the relationship between the indentation load applied to the test piece and the frictional force between the indenter and the test piece can be measured.

The scratch testing machine of the present invention does not require a mechanism for offsetting the weight of the device connected to the indenter, which is an essential component in the conventional testing machine.
Further, as is clear from the experimental results described later, the straight line of the change in the indentation load applied to the test piece surface with respect to the scratch distance (relative second horizontal movement distance between the test piece surface and the indenter). Excellent in properties.

It is a front view which shows one Embodiment of the scratch testing machine of this invention. It is a top view which shows the scratch tester shown in FIG. It is a front view which shows operation | movement of the 1st drive mechanism which comprises the scratch tester shown in FIG. It is a front view which shows operation | movement of the 1st drive mechanism which comprises the scratch tester shown in FIG. It is a front view which shows operation | movement of the 1st drive mechanism which comprises the scratch tester shown in FIG. It is a chart which shows the relationship between a scratch distance and indentation load, (1) is a measurement result by the scratch test machine shown in FIG. 1, (2) is a measurement by the conventional scratch test machine described in patent document 1. It is a result. It is a top view which shows other embodiment of the scratch testing machine of this invention.

<First Embodiment>
Hereinafter, a scratch testing machine according to an embodiment of the present invention will be described with reference to the drawings.
The scratch tester 100 shown in FIGS. 1 and 2 supports a base 10 and supports the test piece in a vertical direction (direction indicated by arrow z in FIG. 1) on the horizontal plane of the base 10. The table 20, the indenter 30 pushed into the surface of the test piece supported by the support table 20, and the tip of the indenter 30 abuts the surface of the test piece and further pushes it in the first horizontal direction (FIG. 1 and FIG. In order to form a scratch on the surface of the test piece supported by the first driving mechanism 40 that moves the indenter 30 toward the tip end side in the direction of the arrow y in FIG. A second drive mechanism 50 that moves in the second horizontal direction (the direction indicated by the arrow x in FIG. 2) in conjunction with the movement of the movable portion of the first drive mechanism 40 is provided.

  A support base 20, a first drive mechanism 40, and a second drive mechanism 50 are placed on the horizontal plane of the base 10 constituting the testing machine 100 of this embodiment.

The support table 20 constituting the testing machine 100 of this embodiment supports the test piece in a state where the test piece is erected in the vertical direction.
The support base 20 is detachably attached to a movable plate 531 of the second drive mechanism 50 described later, and thereby the support base 20 and the test piece supported by the support base 20 are moved in the second horizontal direction. Can do.
Reference numeral 21 denotes a handle used when the support base 20 is attached to and detached from the movable plate 531.
Four toggle clamps 22 for pressing the four corners of the test piece against the surface are provided on the surface of the support base 20 (the support surface of the test piece).

The indenter 30 constituting the testing machine 100 of this embodiment applies a pushing load to the surface of the test piece by pushing the tip of the indenter 30 onto the surface of the test piece supported by the support base 20.
The constituent material of the indenter 30 is not particularly limited, and all materials used in the conventional scratch tester can be used.
The indenter 30 is attached to a tip (an indenter attachment portion 453) of a slide portion 45 of the first drive mechanism 40 described later.

  The first drive mechanism 40 constituting the test machine 100 of this embodiment makes the tip of the indenter 30 abut on the surface of the test piece supported by the support base 20, and further the tip of the indenter 30 on the surface of the test piece. In order to push in, it is a mechanism for moving the indenter 30 to the first horizontal tip side (side on which the support base 20 is located).

  The first drive mechanism 40 includes a motor 411 fixed to the base 10, a screw shaft 412 of a ball screw connected to the motor 411 and extending to the front end side in the first horizontal direction, and a nut 431 of the ball screw. A movable part 43 that moves in one horizontal direction, and a movable part 43 is slidably mounted on the movable part 43 at the rear end side in the first horizontal direction, and an indenter 30 is attached to the front end. The first horizontal portion is interposed between the slide portion 45 and the movable portion 43 and the slide portion 45 so as to prevent the slide portion 45 from sliding toward the rear end side in the first horizontal direction with respect to the movable portion 43. Two coil springs 47, 47 arranged along the direction are provided.

  1 and 2, 413 is a guide rail of a movable part fixed on the horizontal surface of the base 10 so as to extend in the first horizontal direction, 414 is a photosensor on the front end side, and 415 is a photosensor on the rear end side. Reference numeral 416 denotes an impact absorbing spring, and the position of the motor 411, the screw shaft 412 of the ball screw, the guide rail 413 of the movable part, the photo sensor 414, the photo sensor 415, and the impact absorbing spring 416 are fixed to the base 10, respectively. Has been. 417 is an emergency stop switch, and 418 is an operation touch panel.

Further, reference numeral 432 denotes a slide rail formed on the movable portion 43 to allow the slide portion 45 to slide, and reference numeral 433 denotes an indenter by restricting the slide portion 45 from moving to the front end side in the first horizontal direction. A limit switch 434 for restricting the amount of pressing 30 is a detected object detected by the photosensor 414 and the photosensor 415. When the detected body 434 is detected by the photosensor 414, the detected body 434 (movable portion 43) has reached the limit position on the tip side.
The rotation of the motor 411 (screw shaft 412) causes the ball screw nut 431, the slide rail 432, the limit switch 433, and the detected body 434 to be integrally moved to the distal end side in the first horizontal direction as components of the movable portion 43. Moving.

  Reference numeral 451 denotes a slider that slides along the slide rail 432 formed on the movable portion 43, and reference numeral 452 denotes a load cell that measures the indentation load of the indenter 30 applied to the surface of the test piece supported by the support base 20. (First measuring means) 453 is an attachment portion of the indenter 30. When the tip of the indenter 30 comes into contact with the surface of the test piece, the movable portion 43 is moved to the tip side in the first horizontal direction. The slider 451, the load cell 452, and the indenter attachment portion 453 slide as a component of the slide portion 45 toward the rear end side in the first horizontal direction with respect to the movable portion 43.

Further, the two coil springs 47 and 47 are interposed between the movable portion 43 and the slide portion 45, respectively, and when the slide portion 45 slides toward the rear end side in the first horizontal direction with respect to the movable portion 43, respectively. And the slide part 45 opposes the force to slide.
With these coil springs 47, the pushing load can be increased according to the slide amount of the slide portion 45 with respect to the movable portion 43. In addition, since the two coil springs 47 and 47 are arranged on the same horizontal plane with the central axis of the indenter 30 in between, the first horizontal is provided on the surface of the test piece supported in a standing state in the vertical direction. The pushing load in the direction (perpendicular to the surface of the test piece standing up in the vertical direction) can be reliably applied.

  In order to form a scratch on the surface of the test piece supported by the support base 20, the second drive mechanism 50 that constitutes the test machine 100 of this embodiment uses the support base 20 to move the first drive mechanism 40. This is a mechanism for moving in the second horizontal direction in conjunction with the movement of the portion 43.

The second drive mechanism 50 is connected to a robot cylinder 511 fixed to the base 10, two slide rails 512 and 512 that are fixed to the base 10 and extend in the second horizontal direction, and a slider of the robot cylinder 511. And a movable plate 531 that moves in the second horizontal direction along the slide rails 512 and 512.
By mounting the support base 20 on the movable plate 531, the support base 20 and the test piece supported by the support base 20 can be moved in the second horizontal direction.

  In FIG. 1 and FIG. 2, reference numeral 532 denotes a knob for raising and lowering the support base 20 relative to the movable plate 531, and the support base 20 is supported by moving the support base 20 up and down by adjusting the knob 532. Since the vertical position (level) of the test piece can be changed, a plurality of scratches parallel to each other can be formed on the test piece (multiple tests are performed).

By the second drive mechanism 50, the support base 20 moves in conjunction with the movement of the movable portion 43 of the first drive mechanism 40.
That is, the second horizontal movement of the movable plate 531 in the second drive mechanism 50 and the first horizontal movement of the movable portion 43 in the first drive mechanism 40 are linked to each other.
As described above, the indentation load due to the indenter 30 increases in accordance with the movement distance of the movable portion 43, so that the indentation load due to the indenter 30 can be reduced by linking the movement of the movable plate 531 and the movement of the movable portion 43. It can be increased according to the moving distance of the movable plate 531 (support 20).

  Next, an example of the procedure of the scratch test performed using the testing machine 100 according to this embodiment will be described.

(1) Test piece mounting process:
The support 20 is removed from the movable plate 531 of the second drive mechanism 50, a test piece is placed on the surface of the support 20 (the support surface of the test piece), and the four corners are pressed by the toggle clamp 21 and the test piece is placed. To fix.
Thus, since the support base 20 is detachable from the movable plate 531 of the second drive mechanism 50, the test piece can be mounted on the surface of the support base 20 detached from the movable plate 531, so that the test piece The workability at the time of mounting can be improved.

(2) Support table mounting process:
The support base 20 is attached to the movable plate 531 of the second drive mechanism 50. As a result, the test piece supported by the support base 20 is in a state of being erected in the vertical direction on the horizontal plane of the base 10.

(3) Teaching process:
Prior to the scratch test, the relationship between the moving distance of the movable part 43 in the first drive mechanism 40 and the measured value of the indentation load applied to the surface of the test piece by the indenter 30 is measured. Based on the measurement result, a predetermined value is measured. The moving distance of the movable portion 43 corresponding to the maximum load is obtained, and the pushing applied when the support 20 mounted on the movable plate 531 moves in the second horizontal direction from the test start position and reaches the test end position. The first drive mechanism 40 and the second drive mechanism 50 are controlled so that the load becomes the predetermined maximum load.

  The relationship between the moving distance of the movable part 43 in the first drive mechanism 40 and the measured value of the indentation load applied to the test piece by the indenter 30 is measured as follows, for example. This measurement is performed without driving the second drive mechanism 50 (without moving the test piece supported by the support base 20 in the second horizontal direction).

  As shown in FIG. 3A, the screw shaft 412 of the ball screw is rotated by the motor 411 from a standby state where the movable portion 43 of the first drive mechanism 40 is located on the rear end side (right side of the drawing). As a result, the movable portion 43 (nut 431) and the slide portion 45 are integrally moved to the first horizontal distal end side and attached to the distal end (attachment portion 453) of the slide portion 45 as shown in FIG. 3B. The tip of the indenter 30 is in contact with the surface of the test piece 90 supported by a support base (not shown in FIGS. 3A to 3C).

  If the rotation of the screw shaft 412 of the ball screw is continued from the state shown in FIG. 3B, the tip of the indenter 30 is in contact with the surface of the test piece 90, so that the slide portion 45 moves further. Therefore, when the slider 451 constituting this slides along the slide rail 432, the slider 451 slides toward the rear end side in the first horizontal direction with respect to the movable portion 43. Thereby, only the movable part 43 moves to the front end side in the first horizontal direction.

  As shown in FIG. 3C, only the movable portion 43 has moved to the front end side in the first horizontal direction (the slide portion 45 slides to the rear end side in the first horizontal direction with respect to the movable portion 43. ) When the compression force is applied to the coil springs 47, 47, the indenter displacement (the surface of the test piece 90 of the indenter 30) depends on the moving distance of the movable portion 43 (the rotational speed of the screw shaft 412). Vertical displacement) and indentation load increases. Here, the pushing load increases linearly as the moving distance of the movable portion 43 increases.

Therefore, as the relationship between the moving distance of the movable portion 43 after the tip of the indenter 30 is brought into contact with the surface of the test piece 90 and the measured value of the indentation load, for example, the inclination of a straight line indicating the relationship between the two is measured. . This inclination varies depending on the material and hardness of the test piece 90.
Further, from this measurement result, the moving distance of the movable portion 43 (or the corresponding rotation speed of the screw shaft 412 of the ball screw) required for applying a predetermined maximum load (for example, 30 N) to the surface of the test piece is obtained. Ask.

  Next, while the support base 20 (the movable plate 531 of the second drive mechanism 50) moves from the test start position to the test end position, the movable portion 43 of the first drive mechanism 40 is obtained from a necessary distance (determined from the above measurement result). The first drive mechanism 40 and the second drive mechanism 50 are controlled so as to move the distance necessary for applying the maximum load, and an interlocking condition between the movement of the movable plate 531 and the movement of the movable portion 43 is set. .

  As described above, the relationship between the moving distance of the movable portion 43 and the measured value of the indentation load is measured, the moving distance of the movable portion 43 corresponding to the predetermined maximum load is obtained, and the support base 20 reaches the test end position. The first drive mechanism 40 and the second drive mechanism 50 are controlled so that a predetermined maximum load is sometimes applied to the surface of the test piece, and an interlocking condition between the movement of the movable plate 531 and the movement of the movable portion 43 is set. A series of teaching steps are performed by a control means (not shown).

(4) Scratch test:
After completion of the teaching process, the screw shaft 412 of the ball screw is reversely rotated to move (retract) the movable portion 43 and the slide portion 45 toward the rear end side in the first horizontal direction, and the tip of the indenter 30 is moved to the surface of the test piece 90. The test piece 90 is moved about 10 mm in the second horizontal direction by the second drive mechanism 50 and the screw shaft 412 of the ball screw is rotated (forward rotation) again to move the movable part 43 and the slide part. 45 is moved to the tip side in the first horizontal direction, and the tip of the indenter 30 is brought into contact with the surface of the test piece 90 as shown in FIG. 3B.

From the state in which the tip of the indenter 30 is in contact with the surface of the test piece 90, the rotation of the screw shaft 412 is continued to move the movable portion 43 (only) to the tip side in the first horizontal direction, and the second drive mechanism 50, the movable plate 531 on which the support 20 is mounted at the test start position is moved in the second horizontal direction to perform a scratch test by the load increasing method.
Here, the movable plate 531 of the second drive mechanism 50 moves in the second horizontal direction while interlocking with the movable portion 43 of the first drive mechanism 40 moving in the first horizontal direction under the interlocking conditions obtained in the teaching process. Moving.
Thus, when the movable plate 531 mounted with the support base 20 reaches the test end position, a predetermined maximum load (the movable portion 43 corresponds to this) on the surface of the test piece 90 supported by the support base 20. Maximum load due to moving distance) is applied.

  In the testing machine 100 of this embodiment, the movable portion 43 and the slide portion 45 are not moved in the second horizontal direction, but the support base 20 that is much lighter than these is moved in the second horizontal direction. Thus, it is possible to save labor of the test and to avoid the load cell 452 fixed to the slide portion 45 from picking up noise due to vibration or the like. Therefore, a highly reliable test result can be obtained.

  Further, in the testing machine 100 of this embodiment, the guide rail 413 extending in the first horizontal direction is fixed on the horizontal surface of the base 10, and the movable portion 43 moves along the guide rail 413 and the two coils. By arranging the springs 47, 47 on the same horizontal plane across the central axis of the indenter 30, the linearity of the movement trajectory of the indenter 30 can be sufficiently ensured, and the surface of the test piece 90 is An indentation load in one horizontal direction (perpendicular to the surface of the test piece 90 standing in the vertical direction) can be reliably applied.

The moving speed (scratch speed) of the support 20 that is mounted on the movable plate 531 and moves in the second horizontal direction is preferably 10 to 400 mm / s, and is 100 mm / s if a suitable example is shown.
Moreover, it is preferable that it is 50-300 mm as a moving distance (scratch distance) of the support stand 20 from a test start position to a test end position, and if it shows a suitable example, it is 100 mm.

  According to the testing machine 100 of this embodiment, the load due to the weight (self-weight) of the first drive mechanism 40 and the second drive mechanism 50 is applied to the surface of the test piece that is supported in a state in which it is raised in the vertical direction. Since it is not applied, a mechanism for canceling the weight of the first drive mechanism 40 and the second drive mechanism 50 is not required.

Further, when the tip of the indenter 30 is in contact with the surface of the test piece 90 that is supported in a vertically standing state, a load due to the weight of the first drive mechanism 40 is applied to the surface of the test piece 90. Therefore, when performing a scratch test, the pushing load generated by the first drive mechanism 40 (with the tip of the indenter 30 in contact with the surface of the test piece 90, only the movable portion 43 is Only the load generated by moving the coil springs 47, 47 against the biasing force of the first horizontal direction) can be applied to the surface of the test piece 90.
Further, since the load due to the weight of the first drive mechanism 40 is not applied to the surface of the test piece 90, the indentation load applied to the surface of the test piece 90 at the start of the scratch test is made sufficiently small ( For example, it can be set to about 0.1 to 1.0 N).

  Furthermore, the testing machine 100 of this embodiment is excellent in the linearity of the change of the indentation load applied to the surface of the test piece with respect to the moving distance (scratch distance) of the support base 20 from the test start position to the test end position. .

FIG. 4 (1) shows the movement distance (scratch distance) of the support base 20 from the test start position to the test end position measured by the test machine 100 of this embodiment, and the indentation load applied to the surface of the test piece. It is a chart which shows the relationship.
In this test, the set value of the maximum load was 30 N, the scratch distance was 100 mm, and the scratch speed was 100 mm / s.
In addition, the number of times of measurement is 5 times, and FIG. 4 (1) shows the average.

  On the other hand, FIG. 4 (2) shows a conventional scratch tester described in Patent Document 1 (indenter in the horizontal direction while applying a vertical load to the surface of the test piece placed on the horizontal surface of the base. Is a chart showing the relationship between the scratch distance and the indentation load measured under the same test conditions using the same test piece as described above.

Second Embodiment
FIG. 5 is a plan view showing another embodiment of the scratch testing machine of the present invention. In FIG. 5, the same reference numerals as those in FIG. 2 denote the same configurations as those of the testing machine 100 of the first embodiment. Is an element.

2 is a load cell 455 that measures a frictional force (horizontal load in the second horizontal direction) between the test piece moved in the second horizontal direction together with the support base 20 by the second drive mechanism 50 and the indenter 30. (Second measuring means).
According to the testing machine 200, the relationship between the indentation load measured by the load cell 452 (first measurement means) and the frictional force (second horizontal load) measured by the load cell 455 (second measurement means). Can be measured. For example, the scratch friction coefficient can be calculated by dividing the pushing load by the horizontal load in the second horizontal direction.

Although the embodiments of the scratch testing machine of the present invention have been described above, the present invention is not limited to these, and various modifications are possible.
For example, in order to form a scratch on the surface of the test piece, the support base may be fixed and the indenter may be moved in the second horizontal direction.
Further, the scratch test may be performed with a constant load without increasing the load during the test.

DESCRIPTION OF SYMBOLS 100 Scratch testing machine 10 Base 20 Test piece support 21 Handle 22 Toggle clamp 30 Indenter 40 First drive mechanism 411 Motor 412 Screw shaft of ball screw 413 Guide rail of movable part 414 Photo sensor 415 Photo sensor 416 Shock absorbing spring 417 First stop mechanism emergency stop switch 418 Operation touch panel 43 Movable part 431 Nut 432 Slide rail 433 Limit switch 434 Detected object 45 Slide part 451 Slider 452 Load cell (first measurement means)
453 Indenter mounting portion 47 Coil spring 50 Second drive mechanism 511 Robot cylinder 512 Slide rail 531 Movable plate 532 Support knob lifting knob 200 Scratch tester 455 Load cell (second measuring means)

Claims (7)

The base,
A support base that supports the test piece in a state in which the test piece is erected in the vertical direction on the horizontal plane of the base; an indenter that is pushed into the surface of the test piece supported by the support base;
A first drive mechanism that moves the indenter to the tip side where the support table in the first horizontal direction is located in order to bring the tip of the indenter into contact with the surface of the test piece supported by the support table and further push it in. When,
A second drive mechanism for moving the support table or the indenter in a second horizontal direction perpendicular to the first horizontal direction in order to form a scratch on the surface of the test piece supported by the support table;
A scratch testing machine characterized by comprising: The first drive mechanism includes a motor fixed to the base;
A screw shaft of a ball screw connected to the motor and extending to the first horizontal tip side;
A movable part that moves to the tip side in the first horizontal direction together with the nut of the ball screw;
A slide part that is slidably attached to the rear end side in the first horizontal direction relative to the movable part at the front end side of the movable part, and an indenter is attached to the front end;
Located between the movable portion and the slide portion, the slide portion is disposed along the first horizontal direction so as to prevent the slide portion from sliding toward the rear end side in the first horizontal direction with respect to the movable portion. Coil spring and
2. The scratch tester according to claim 1, wherein the second drive mechanism moves the support base in a second horizontal direction in conjunction with movement of a movable portion of the first drive mechanism. The first drive mechanism includes a guide rail of the movable part fixed on the horizontal surface of the base so as to extend in the first horizontal direction,
The scratch testing machine according to claim 2, wherein the two coil springs are arranged on the same horizontal plane across the central axis of the indenter.   The scratch testing machine according to claim 2 or 3, wherein the first drive mechanism includes a limit sensor and a limit switch that limit a moving range of the movable part.   The scratch according to any one of claims 2 to 4, further comprising first measuring means for measuring an indentation load of the indenter applied to the surface of the test piece supported by the support base. testing machine.   The moving distance of the movable part or the number of rotations of the screw shaft of the ball screw after the tip of the indenter comes into contact with the surface of the test piece supported by the support base, and the indenter applied to the surface of the test piece The measured value of the indentation load is measured; based on the measurement result, the moving distance of the movable part corresponding to a predetermined maximum load or the rotational speed of the screw shaft is obtained; And means for controlling the first drive mechanism and the second drive mechanism so that a predetermined maximum load is applied to the test piece when it moves in the direction and reaches a predetermined scratch distance. The scratch testing machine according to claim 5.   7. A test piece that moves in the second horizontal direction together with the support base by the second drive mechanism, and second measuring means for measuring a frictional force between the indenter and the second inspector. A scratch testing machine according to any one of the above.

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