JP2020201058A - Bending tester - Google Patents

Abstract

To appropriately evaluate bending resistance of a test piece while preventing an increase in the cost required for carrying out a bending test when testing the bending resistance of the test piece in a bending mode of folding a sheet-like test piece in half.SOLUTION: A bending tester 1 includes a first placement surface on which a sheet-like test piece 10 is placed, a fixing unit 3 having a fixing tool for fixing the test piece to the first placement surface, a second placement surface juxtaposed with the first placement surface and on which an extended portion of the test piece is placed, and a holder 43 for holding the extended portion of the test piece along the second placement surface. A swinging unit 4 is arranged to be swingable relative to the fixing unit around a swinging axis line arranged between the first placement surface and the second placement surface in view from the direction perpendicular to the first placement surface in a state where the test piece is placed. The bending tester includes the swinging unit and a shaft support unit 5 for supporting the swinging unit. The holder holds the test piece while allowing relative movement of the swinging unit and the test piece along the second placement surface caused by swinging of the swinging unit.SELECTED DRAWING: Figure 1

Description

The present invention relates to a bending tester for testing the bending resistance of a sheet-shaped test piece.

When the bending resistance of a sheet-shaped product is tested using a test piece having the same structure as that of the product, for example, a bending tester is used. Examples of the test method using this testing machine include a cylindrical mandrel method in which a test piece is bent so as to be wound around a peripheral surface of a shaft member (mandrel) in accordance with JIS K5600-5-1, and Patent Document 1 As disclosed in the above, there is a method of fixing one end of the test piece and bending the test piece by moving the other end close to or separated from the one end.

Japanese Unexamined Patent Publication No. 2016-80694

However, when the product is used in a mode of bending it in half, the mode is different from the mode of bending the test piece in each of the above methods. Therefore, it is difficult to appropriately evaluate the bending resistance of the test piece by each of the above methods in the mode of bending the sheet-shaped test piece in half.

Further, according to the cylindrical mandrel method, since the shaft member repeatedly contacts the surface of the test piece, the test piece may be damaged by the long-term test, and it may be difficult to properly perform the bending test. Also, simply trying to prevent damage to the test piece during the test complicates the structure of the bending tester and increases the cost required to perform the bending test.

Therefore, according to the present invention, when testing the bending resistance of a test piece in a bending mode in which a sheet-shaped test piece is folded in half, the test piece can be prevented from increasing in cost required for performing the bending test. The purpose is to be able to appropriately evaluate bending resistance.

In order to solve the above problems, the bending tester according to one aspect of the present invention includes a first mounting surface on which a sheet-shaped test piece is placed, and the first mounting surface to the first mounting surface. A fixing unit having a fixture for fixing the test piece to the first mounting surface in a state where the test piece extends outward from the first mounting surface, and the test piece being juxtaposed with the first mounting surface. The second mounting surface on which the extending portion extending from the first mounting surface to the outside of the first mounting surface is mounted, and the extending portion of the test piece along the second mounting surface. It has a holder that holds the test piece in a pressed state, and the test piece is placed over the first mounting surface and the second mounting surface from a direction perpendicular to the first mounting surface. As seen, a swing unit arranged so as to be swingable with respect to the fixed unit around a swing axis arranged between the first mounting surface and the second mounting surface, and the swing unit. The holder includes a shaft support unit that supports the shaft, and the holder allows relative movement of the rocking unit and the test piece along the second mounting surface as the rocking unit swings. While holding the test piece.

According to the above configuration, the swinging unit swings with respect to the fixed unit, so that the sheet-shaped test pieces mounted over the mounting surfaces of the fixed unit and the swinging unit can be mounted on each mounting surface. It is bent in the direction of facing each other and overlapping. Therefore, the bending test can be performed in a manner in which the test piece is bent in the thickness direction. Therefore, the bending resistance of the test piece in the bending mode in which the test piece is folded in half can be appropriately evaluated.

Further, according to the above configuration, since it is not necessary to wind the test piece around a shaft member such as a mandrel during the test, it is possible to prevent the test piece from being damaged by the shaft member. Further, since the relative movement of the swing unit and the test piece along the second mounting surface due to the swing of the swing unit is allowed, unnecessary tension is applied in the direction perpendicular to the swing axis with respect to the test piece. Is prevented from acting. Therefore, the bending test can be appropriately performed.

The holder may slidably hold one end of the test piece perpendicular to the swing axis along the second mounting surface. As a result, it is possible to satisfactorily prevent the tension from acting on the test piece under test, and accurate test results can be obtained. Further, it is possible to prevent the tension from acting on the test piece with a relatively simple structure without using a complicated mechanism or structure. Therefore, it is possible to prevent an increase in the cost required for carrying out the bending test.

The holder may have an eaves portion arranged to face the second mounting surface, and may hold the test piece between the second mounting surface and the eaves portion. As a result, the test piece can be held with a relatively simple structure while preventing the tension from acting on the test piece during the test.

The shaft-supported portion of the swing unit pivotally supported by the shaft support unit is arranged outside in the direction along the swing axis with respect to the test piece mounted on the second mounting surface. You may. As a result, it is possible to prevent the shafted support portion of the swing unit from interfering with the test piece during the test, and the bending test can be performed satisfactorily in a mode in which the test piece is bent in the thickness direction.

A counter that counts the number of swings when the swing unit is repeatedly rocked around the swing axis may be further provided. As a result, even when the test piece is tested for a long time, the number of swings can be automatically and easily grasped by the counter.

The bending radius of the test piece when the test piece mounted over the first mounting surface and the second mounting surface bends around the swing axis as the swing unit swings. Adjustably, an adjusting member for adjusting the position of the swinging unit with respect to the fixing unit may be further provided. By using such an adjusting member, the mode in which the test piece bends in the thickness direction can be adjusted in detail, and the bending test according to the purpose can be satisfactorily performed.

The swing unit with respect to the fixed unit within a range in which the angle between the first mounting surface and the second mounting surface on the side on which the test piece is mounted is 0 ° or more and 180 ° or less. May swing. As a result, the test piece can be bent in the thickness direction over a wide range, and the setting range of the bending test can be expanded.

The fixture may be arranged outside the region of the fixing unit that overlaps with the swing unit in a state where the first mounting surface and the second mounting surface are arranged so as to face each other most closely. .. As a result, it is possible to prevent the fixture from interfering with the swing unit, so that the setting range of the bending test can be further expanded.

A drive unit that drives the rocking unit so as to repeatedly swing the rocking unit around the rocking axis with respect to the fixed unit, and a detection that detects the position of the rocking unit around the rocking axis. A device and a controller for controlling the drive unit may be provided. As a result, the bending test can be automated, and the test can be easily performed over a long period of time. Further, by using the detector, the test piece can always be bent at a constant angle, and the bending test can be appropriately performed.

The drive unit has a motor for transmitting a driving force to the swing unit and a drive circuit for driving the motor, and the controller is based on a storage unit in which a control program is stored and the control program. It may have a calculation unit that controls the drive circuit.

According to the above configuration, the control content of the drive circuit by the arithmetic unit can be easily adjusted only by changing the content of the control program stored in the storage unit. As a result, the operation of the swing unit can be set quickly and easily, and the bending test can be efficiently performed.

According to each aspect of the present invention, when testing the bending resistance of a test piece in a bending mode in which a sheet-shaped test piece is folded in half, while preventing an increase in cost required for performing the bending test. , The bending resistance of the test piece can be appropriately evaluated.

It is an external view of the bending tester which concerns on embodiment. It is a perspective view of the rocking unit of FIG. It is an exploded view of the rocking unit of FIG. It is a figure which shows the test piece when the space between the rocking plate and the fixing plate of FIG. 1 is the most open state. It is a figure which shows the test piece when the space between the rocking plate and the fixing plate of FIG. 1 is the most closed state.

Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is an external view of the bending tester 1 according to the embodiment. FIG. 2 is a perspective view of the swing unit 4 of FIG. FIG. 3 is an exploded view of the swing unit 4 of FIG. In FIG. 2, the swing arm 40 of the swing unit 4 and the connecting member 41 and the like are not shown. In FIG. 3, the holder 43 is not shown.

The bending tester 1 tests the bending resistance of the test piece 10 in a bending mode in which the sheet-shaped and long test piece 10 is folded in half. The test piece 10 is a film attached to various displays such as a portable electronic terminal and a touch panel. The bending test of the test piece 10 is one of the quality inspection items of the film. As an example, the film has a base member and a hard coat member that is placed on top of the base member and has a higher hardness than the base member. The base member and the hard coat member are made of a resin material.

By testing the bending resistance of the test piece 10 with the bending tester 1, when a film of a product having the same configuration as the test piece 10 is attached to the display and used, for example, the film is folded in half together with the display. The bending resistance of the film when it is bent can be evaluated. In the test piece 10, the hard coat member may be omitted. Further, the test piece 10 is not limited to the one having the above-mentioned structure, and may have, for example, a structure as a composite material formed by laminating a resin film and a thin film glass. The test piece 10 in this case is also attached to various displays in the same manner as the above-mentioned film, for example. Further, the test piece 10 is not limited to the above-mentioned use.

As shown in FIGS. 1 to 3, the bending tester 1 includes a base 2, a fixing unit 3, a swing unit 4, a shaft support unit 5, a drive unit 6, a counter 7, a controller 8, and a detector 9. The base 2 extends horizontally below the bending tester 1. The base 2 supports each component 3-8. Wiring and the like are housed inside the base 2. The base 2 of the present embodiment has a plate shape, and the upper surface and the lower surface are arranged horizontally.

The fixed unit 3 and the swinging unit 4 are arranged side by side on the upper surface of the base 2. The fixing unit 3 has a fixing base 30, a fixing plate 31, and a fixing tool 32. The fixing base 30 is fixed to the base 2 and supports the fixing plate 31. The fixing plate 31 has a first mounting surface 31a on which the sheet-shaped test piece 10 is mounted. The fixing plate 31 is fixed to the base 2 so that one surface faces the upper surface. The first mounting surface 31a of the present embodiment is the upper surface of the fixing plate 31.

The fixture 32 fixes the test piece 10 to the first mounting surface 31a in a state where the test piece 10 extends from the first mounting surface 31a to the outside of the first mounting surface 31a. As an example, the fixture 32 has a long plate member 33 that is arranged so as to be overlapped with the test piece 10, and a fixing member 34 that detachably fixes the plate member 33 to the fixing plate 31. The fixing unit 3 sandwiches one end 10a of the test piece 10 in the longitudinal direction between the plate member 33 and the fixing plate 31. The fixing member 34 is a fastening member here, and is not limited to a knurled knob as an example.

The swing unit 4 is pivotally supported so as to swing with respect to the fixed unit 3. The swing unit 4 swings with respect to the fixed unit 3 around the swing axis X, which will be described later, so that the operation of bending the test piece 10 in half and the operation of canceling the bending are alternately repeated. The swing unit 4 has a pair of swing arms 40, a plurality of connecting members 41, a swing plate 42, a holder 43, and a pair of support bases 44. The pair of swing arms 40 have a long shape and are connected by a plurality of connecting members 41 in a state of being arranged parallel to each other. A through hole 40a is formed in a portion of each swing arm 40 near one end in the longitudinal direction. The rotating shaft 52 of the shaft support unit 5 is inserted and fixed in the through hole 40a.

The plurality of connecting members 41 have a long shape and are arranged side by side in the longitudinal direction of the swing arm 40. The connecting member 41 is arranged so as to overlap the rocking plate 42. The pair of swing arms 40 and the connecting member 41 support the swing plate 42. The rocking plate 42 is arranged side by side with the first mounting surface 31a, and a second extending portion extending outward from the first mounting surface 31a of the test piece 10 to the first mounting surface 31a is mounted. It has a mounting surface 42a. The connecting member 41 is located on the side opposite to the second mounting surface 42a of the rocking plate 42.

The holder 43 holds the extending portion of the test piece 10 along the second mounting surface 42a. The holder 43 of the present embodiment holds the test piece 10 while allowing the relative movement of the swing unit 4 and the test piece 10 along the second mounting surface 42a accompanying the swing of the swing unit 4, which will be described later. To do. As an example, the holder 43 slidably holds the other end 10b (one end perpendicular to the swing axis X) of the test piece 10 in the longitudinal direction along the second mounting surface 42a. The holder 43 has an eaves portion 43a arranged so as to face the second mounting surface 42a, and holds the test piece 10 between the second mounting surface 42a and the eaves portion 43a.

The holder 43 is arranged on the first member 45 and the long first member 45 which is partially overlapped on the surface of the rocking plate 42 opposite to the second mounting surface 42a. It has a shim 46 and a long second member 47 which is arranged on the shim 46 and has an L-shaped cross section. The second member 47 has a plate portion arranged so as to face the second mounting surface 42a. In the present embodiment, this plate portion is the eaves portion 43a. The second member 47 is detachably fixed to the first member 45 and the shim 46 by the fixing member 49. The fixing member 49 is a fastening member here, and is, for example, a countersunk bolt, but is not limited thereto.

A slit S extending along the second mounting surface 42a is provided between the eaves portion 43a and the second mounting surface 42a. A part of the test piece 10 is inserted into the slit S. In the bending tester 1, as an example, the fixture 32 is arranged on one end 10a side in the longitudinal direction of the elongated test piece 10, and the holder 43 is arranged on the other end 10b side. The width dimension D1 in the direction perpendicular to the second mounting surface 42a of the slit S can be easily adjusted by, for example, adjusting the thickness dimension D2 of the shim 46.

The width dimension D1 of the slit S can be appropriately set within a range larger than the thickness dimension D3 (see FIG. 4) of the test piece 10 and capable of holding the test piece 10. As an example, the width dimension D1 of the slit S is set to a value larger than the thickness dimension D3 of the test piece 10 in the range of 0.1 mm or more and 0.5 mm or less, but is not limited thereto.

The rocking unit 4 has a first mounting surface viewed from a direction perpendicular to the first mounting surface 31a in a state where the test piece 10 is mounted over the first mounting surface 31a and the second mounting surface 42a. Around the swing axis X arranged between the 31a and the second mounting surface 42a, the swing axis X is swingably arranged with respect to the fixed unit 3.

The pair of support bases 44 are fixed to the base 2 so as to be close to the rocking plate 42 when the space between the rocking plate 42 and the fixing plate 31 is most open (hereinafter, also referred to as a flat state). Is located in. The contact portion of the support base 44 with the swing arm 40 is made of an elastic member such as rubber. As a result, even if an external force acts on the swing unit 4 when the swing direction of the swing unit 4 is reversed, the swing arm 40 comes into contact with the support base 44 and the elastic member is elastically deformed to swing. The unit 4 can be stably supported by the support base 44, and unnecessary impact is prevented from being transmitted from the support base 44 to the test piece 10 on the swing unit 4. In the present embodiment, a region where the first mounting surface 31a and the second mounting surface 42a are arranged so as to face each other most closely (hereinafter, also referred to as the most bent state) and overlap with the swing unit 4 of the fixed unit 3. The fixture 32 is arranged on the outside of the.

The shaft support unit 5 pivotally supports the swing unit 4 on the base 2. In the present embodiment, the bending tester 1 has a pair of shaft support units 5, and two shaft support units 5 are arranged on both sides of the swing unit 4 along the swing axis X. The shaft support unit 5 has a shaft abutment 50, a bearing 51, and a rotating shaft 52. The shaft abutment 50 is fixed to the upper surface of the base 2. The bearing 51 is arranged inside the through hole 50a provided in the shaft abutment 50. One end of the rotating shaft 52 in the axial direction is rotatably supported by the bearing 51, and the other end is fixed to the swing arm 40 of the swing unit 4. The rotation axes of the two rotation axes 52 coincide with the swing axis X. As a result, the swing unit 4 swings around the axis of the rotating shaft 52.

The shafted support portion of the swing unit 4 pivotally supported by the shaft support unit 5 (in the present embodiment, the portion provided with the through hole 40a of the swing arm 40) is mounted on the second mounting surface 42a. It is arranged outside the test piece 10 in the direction along the swing axis X. As a result, in the bending tester 1, the overlap between the test piece 10 and the rotating shaft 52 is avoided in the thickness direction of the test piece 10.

The drive unit 6 drives the swing unit 4 so as to repeatedly swing the swing unit 4 around the swing axis X with respect to the fixed unit 3. The drive unit 6 of the present embodiment includes a motor 60 and a drive circuit 61. The motor 60 is connected to the swing unit 4 and transmits a driving force to the swing unit 4. The motor 60 of the present embodiment is a servo motor, and here, as an example, is a stepping motor, but the motor 60 is not limited thereto. The drive shaft 62 of the motor 60 is connected to one of the rotating shafts 52 of the pair of shaft support units 5. As a result, the rotational driving force of the drive shaft 62 of the motor 60 is transmitted to the rotary shaft 52, and the rotary shaft 52 reciprocates around the shaft 52. The drive circuit 61 drives the motor 60.

The drive circuit 61 of the present embodiment has an encoder that detects the rotation angle of the drive shaft 62 of the motor 60. In the present embodiment, the drive shaft 62 is connected to the rotary shaft 52, and the rotary shaft 52 is fixed to the swing arm 40. As a result, the rotation angle of the drive shaft 62 corresponds to one-to-one with the swing angle θ around the swing axis X of the swing unit 4. The position information of the swing unit 4 during swing is monitored by the controller 8. As a result, the controller 8 grasps the number of swings of the swing unit 4.

The controller 8 controls the drive unit 6. The controller 8 is connected to the drive circuit 61. The controller 8 has a storage unit 80 in which the control program is stored, and a calculation unit 81 that controls the drive circuit 61 based on the control program. As an example, the arithmetic unit 81 is realized by a CPU, and the storage unit 80 is realized by a ROM, a RAM, and an HDD. The control program determines the maximum value of the swing speed, the number of swings (or swing time), and the swing angle θ of the swing unit 4 according to the input instruction from the operator. These items are easily adjusted to arbitrary values or preset values by the operation of the operator. The storage unit 80 does not have to have any one of ROM, RAM, and HDD.

The bending tester 1 further includes a power switch SW1, a start switch SW2, a stop switch SW3, an origin movement switch SW4, an emergency stop switch SW5, and a plurality of selection switches SW6. The switches SW1 to SW6 are connected to the controller 8. The power switch SW1 turns on / off the bending tester 1. The start switch SW2 starts the flexibility test by the bending tester 1. The stop switch SW3 stops the bending tester 1 under test. The origin movement switch SW4 moves the swing unit 4 to a predetermined origin position. The emergency stop switch SW5 makes the flexibility test 1 emergency stop. The plurality of selection switches SW6 correspond to different preset control contents of the controller 8. When the operator presses the specific selection switch SW6, the control content for the drive unit 6 of the controller 8 is selected. The ON / OFF state of each switch SW1 to SW6 is monitored by the controller 8.

The counter 7 counts the number of swings when the swing unit 4 is repeatedly rocked around the swing axis X. The counter 7 has a counting unit 70 that counts the number of swings of the swing unit 4, and a display unit 71 that displays the number of counts. The counter 7 is attached to the panel 11 provided on the base 2 together with the switch SW6.

The detector 9 detects the position of the swing unit 4 (here, the position around the swing axis X). The output signal from the detector 9 is transmitted to the counting unit 70 of the counter 7. This output signal is monitored by the controller 8. The detector 9 is, for example, a detection sensor, which is an optical sensor that emits visible light (red), but is not limited to this, and may be, for example, an infrared sensor.

The detector 9 is arranged so as to be able to detect, for example, whether or not the swing unit 4 is at the origin position. The counting unit 70 counts the number of swings of the swing unit 4 based on the output signal of the detector 9. The bending tester 1 may include a plurality of detectors 9 in which the swinging unit 4 during swinging can be detected at different positions.

FIG. 4 is a diagram showing a test piece 10 when the space between the rocking plate 42 and the fixing plate 31 of FIG. 1 is in the most open state (hereinafter, also referred to as a flat state). FIG. 5 is a diagram showing a test piece 10 when the space between the rocking plate 42 and the fixing plate 31 of FIG. 1 is in the most closed state (most refracted state). As shown in FIGS. 4 and 5, in the flat state, the test piece 10 swings at the boundary between the fixed plate 31 and the rocking plate 42 and above the fixed plate 31 and the rocking plate 42. It is located apart from the first mounting surface 31a and the second mounting surface 42a by the shortest distance corresponding to the bending radius R of the test piece 10 when bending around the moving axis X. At this time, as an example, both the first mounting surface 31a and the second mounting surface 42a are arranged in parallel at the same height position from the upper surface of the base 2. Further, in the flat state, the swing angle θ around the swing axis X of the swing plate 42 with respect to the fixed plate 31 is 0 °.

One end of the rocking plate 42 on the opposite side of the boundary swings along the semicircle indicated by the outer broken line in FIGS. 4 and 5. In the state where the rocking plate 42 and the fixing plate 31 are most closed (hereinafter, also referred to as the most bent state), the rocking angle θ is 180 °. In the most bent state, the rocking plate 42 and the fixing plate 31 face each other in parallel with a minimum distance of twice (2R) the bending radius R of the test piece 10.

As described above, in the present embodiment, the angle (swing angle θ) between the first mounting surface 31a and the second mounting surface 42a on the side on which the test piece 10 is mounted is 0 ° or more and 180 ° or less. The swing unit 4 swings with respect to the fixed unit 3 within the above range. Since the thickness dimension D3 of the test piece 10 is much smaller than the thickness dimension of the rocking plate 42, the swing angle θ is a test mounted over the first mounting surface 31a and the second mounting surface 42a. It is substantially the same as the bending angle of the piece 10.

Here, when the swing unit 4 swings around the swing axis X, there is a process in which the shortest distance between the first mounting surface 31a and the second mounting surface 42a becomes longer than in the flat state. In this process, an unnecessary tension may act on the test piece 10 mounted over the first mounting surface 31a and the second mounting surface 42a in the direction perpendicular to the swing axis X. This tension increases with the amount of increase in the shortest distance. This may make it difficult to properly evaluate the bending resistance of the test piece 10.

Therefore, the holder 43 of the bending tester 1 holds the test piece 10 while allowing the relative movement of the swing unit 4 and the test piece 10 along the second mounting surface 42a due to the swing of the swing unit 4. To do. As an example, the holder 43 slidably holds one end of the test piece 10 perpendicular to the swing axis X (here, the other end 10b in the longitudinal direction of the test piece 10) along the second mounting surface 42a. As a result, in the bending tester 1, the test piece 10 moves relative to the second mounting surface 42a before the tension acts on the test piece 10 under test. As a result, the tension is prevented from acting on the test piece 10.

A first spacer (not shown) for adjusting the height position of the first mounting surface 31a from the upper surface of the base 2 is arranged between the fixing plate 31 and the fixing base 30. Further, a second spacer 48 for adjusting the height position of the second mounting surface 42a from the upper surface of the base 2 in a flat state is arranged between the rocking plate 42 and the connecting member 41. ..

The fixing plate 31 is detachably fixed to the fixing base 30 via the first spacer. The rocking plate 42 is detachably fixed to the connecting member 41 via the second spacer 48. The first spacer and the second spacer 48 are washers here, but are not limited thereto.

In the bending tester 1, the first mounting surface 31a and the second mounting surface 42a in the flat state are arranged in the same plane by adjusting the thickness dimensions of the first spacer and the second spacer 48. The fixed unit 3 and the swinging unit 4 are arranged so as to be used. Further, the bending radius R is adjusted by adjusting the thickness dimensions of the first spacer and the second spacer 48. That is, the bending tester 1 includes a first spacer and a second spacer 48 as adjusting members for adjusting the position of the swing unit 4 with respect to the fixing unit 3 so that the bending radius R can be adjusted.

Next, a method of performing a bending test of the test piece 10 using the bending tester 1 will be illustrated. The operator first presses the switches SW1 and SW4 to move the swing unit 4 to the origin position (the position where the swing angle θ = 180 °) to bring the bending tester 1 into the initial state. In this state, one end 10a of the sheet-shaped test piece 10 is fixed to the first mounting surface 31a by the fixture 32, and the other end 10b of the test piece 10 is inserted into the slit S of the holder 43.

Next, the operator sets the control content (the swing speed of the swing unit 4, the number of swings (or the swing time), the maximum value of the swing angle θ, etc.) for controlling the drive unit 6 by the controller 8. In the present embodiment, the operator performs this setting by pressing a specific selection switch SW6 among the plurality of selection switches SW6. The operator also initializes the count number of the counter 7 to zero. In this state, the operator presses the start switch SW2.

As a result, the controller 8 starts the bending test of the test piece 10 attached to the bending tester 1 by driving the motor 60 at a predetermined rotation angle and rotation speed in the drive circuit 61 based on the control program. The counting unit 70 of the counter 7 displays the number of swings (number of round trips) of the swing unit 4 on the display unit 71 in real time based on the detection signal of the detector 9.

During the test, the bent portion of the test piece 10 mounted over the first mounting surface 31a and the second mounting surface 42a is not wound around a shaft member such as a mandrel, so that the state of the portion during the test is the axis. It is easily visible from the outside without being disturbed by the members. Further, even if an external force acts on the swing unit 4 when the swing direction of the swing unit 4 is reversed, the swing unit 4 is stably supported by the support base 44, and the elastic member of the support base 44 is supported. Is elastically deformed to prevent unnecessary impact from being transmitted to the test piece 10 on the swing unit 4.

Next, the controller 8 counts the number of swings to determine whether or not the number of swings (or swing time) of the swing unit 4 has reached a preset upper limit value. When the controller 8 determines that the number of swings (or swing time) of the swing unit 4 has reached the upper limit value, the controller 8 controls the drive circuit 61 so as to stop the swing unit 4. This completes the bending test. Further, the controller 8 controls the drive circuit 61 so as to stop the swing unit 4 even when the operator presses the stop switch SW3 during the test.

In this bending test, for example, the life of the test piece 10 is the time when the test piece 10 is broken during the test or the time when the test piece 10 is cracked during the test. Therefore, for example, the number of times of bending or the bending time until the life of the test piece 10 can be used as an evaluation item of the bending resistance of the test piece 10.

As described above, according to the bending tester 1, the swing unit 4 swings with respect to the fixed unit 3 so that the fixed unit 3 and the swing unit 4 are mounted on the mounting surfaces 31a and 42a. The placed sheet-shaped test piece 10 is bent in a direction in which the mounting surfaces 31a and 42a face each other and overlap each other. Therefore, the bending test can be performed in a manner in which the test piece 10 is bent in the thickness direction. Therefore, the bending resistance of the test piece 10 in the bending mode in which the test piece 10 is folded in half can be appropriately evaluated.

Further, since it is not necessary to wind the test piece 10 around a shaft member such as a mandrel during the test, it is possible to prevent the test piece 10 from being damaged by the shaft member. Further, since the relative movement of the swing unit 4 and the test piece 10 along the second mounting surface 42a due to the swing of the swing unit 4 is allowed, the swing axis X is set with respect to the test piece 10. Unwanted tension is prevented from acting in the vertical direction. Therefore, the bending test can be appropriately performed.

Further, the holder 43 slidably holds one end of the test piece 10 perpendicular to the swing axis X along the second mounting surface 42a. As a result, the tension can be satisfactorily prevented from acting on the test piece 10 under test, and accurate test results can be obtained. Further, it is possible to prevent the tension from acting on the test piece with a relatively simple structure without using a complicated mechanism or structure. Therefore, it is possible to prevent the cost required for performing the bending test from increasing.

Further, the holder 43 has an eaves portion 43a arranged so as to face the second mounting surface 42a, and holds the test piece 10 between the second mounting surface 42a and the eaves portion 43a. As a result, the test piece 10 can be held with a relatively simple structure while preventing unnecessary tension from acting on the test piece 10 during the test.

Further, in the bending tester 1, the axially supported portion of the swing unit 4 pivotally supported by the shaft support unit 5 is in a direction along the swing axis X with respect to the test piece 10 mounted on the second mounting surface 42a. It is located on the outside of. As a result, it is possible to prevent the shafted support portion of the swing unit 4 from interfering with the test piece 10 during the test, and the bending test can be performed satisfactorily in a mode in which the test piece 10 is bent in the thickness direction.

Further, the bending tester 1 includes a counter 7 that counts the number of swings when the swing unit 4 is repeatedly rocked around the swing axis X. As a result, even when the test piece 10 is tested for a long time, the number of swings can be automatically and easily grasped by the counter 7.

Further, in the bending tester 1, when the test piece 10 mounted over the first mounting surface 31a and the second mounting surface 42a bends around the swing axis X as the swing unit 4 swings. An adjusting member (first spacer and second spacer 48) for adjusting the position of the swing unit 4 with respect to the fixing unit 3 is provided so that the bending radius R of the test piece 10 can be adjusted. By using such an adjusting member, the mode in which the test piece 10 bends in the thickness direction can be adjusted in detail, and the bending test according to the purpose can be satisfactorily performed.

Further, in the bending tester 1, the fixing unit is set in a range where the angle θ between the first mounting surface 31a and the second mounting surface 42a on the side on which the test piece 10 is mounted is 0 ° or more and 180 ° or less. The swing unit 4 swings with respect to 3. As a result, the test piece 10 can be bent in the thickness direction over a wide range, and the set width of the bending test can be expanded.

Further, the fixture 32 is arranged outside the region of the fixing unit 3 that overlaps with the swing unit 4 in a state where the first mounting surface 31a and the second mounting surface 42a are arranged so as to face each other most closely. As a result, the fixture 32 can be prevented from interfering with the swing unit 4, so that the setting range of the bending test can be further expanded.

Further, the bending tester 1 has a drive unit 6 that drives the swing unit 4 so as to repeatedly swing the swing unit 4 around the swing axis X with respect to the fixed unit 3, and a swing axis of the swing unit 4. It includes a detector that detects a position around X and a controller 8 that controls a drive unit 6. As a result, the bending test can be automated, and the test can be easily performed over a long period of time. Further, by using the detector, the test piece 10 can always be bent at a constant angle, and the bending test can be appropriately performed.

Further, the drive unit 6 has a motor 60 for transmitting a driving force to the swing unit 4 and a drive circuit 61 for driving the motor 60, and the controller 8 controls the storage unit 80 in which the control program is stored. It has a calculation unit 81 that controls the drive circuit 61 based on the program. According to this configuration, the control content of the drive circuit 61 by the calculation unit 81 can be easily adjusted only by changing the content of the control program stored in the storage unit 80. As a result, the operation of the swing unit 4 can be set quickly and easily, and the bending test can be efficiently performed.

The present invention is not limited to the embodiments, and its configuration can be changed, added, or deleted without departing from the spirit of the present invention. The holder 43 may be provided so as to hold two sides of the test piece 10 perpendicular to the swing axis X. Further, a long member is provided in the swing unit 4 so as to cross the test piece 10 in the extending direction of the swing axis X, and the long member is used as a holder to be mounted on the second mounting surface 42a. The portion of the test piece 10 may be retained. In this case, care should be taken not to make the long member narrow the swing angle θ of the swing unit 4 more than necessary.

Further, the drive circuit 61 may also serve as a detector 9. In the present embodiment, the drive shaft 62 is connected to one of the rotating shafts 52, and the rotating shaft 52 is fixed to the swing arm 40. As a result, the rotation angle of the drive shaft 62 corresponds to the swing angle θ of the swing unit 4 on a one-to-one basis. Therefore, the drive circuit 61 can also serve as a detector 9 for detecting the position of the swing unit 4 to which the motor 60 is connected around the swing axis X. Further, when the tension acting on the test piece 10 under test is negligible, for example, by reducing the thickness dimension of the shim 46 or omitting the shim 46, the test piece 10 is shaken by the holder 43. It may be fixed to the unit 4.

Further, in the above embodiment, the upper limit value of the number of swings of the swing unit 4 is set in advance by the control program, and the controller 8 counts the number of swings, but the present invention is not limited to this. For example, the controller 8 may determine from the detection signal of the detector 9 whether or not the number of swings (or swing time) of the swing unit 4 has reached a preset upper limit value. Further, the upper limit number of counts may be preset in the counter 7, and when the number counted by the counter 7 reaches the upper limit of the count, the counter 7 may output an output signal to that effect to the controller 8. In this case, the controller 8 can grasp the number of swings of the swing unit 4 by receiving the output signal.

Further, in the above embodiment, an example is shown in which the motor 60 is driven by the drive circuit 61 by a closed loop method using an encoder. When the motor 60 is a stepping motor, the drive circuit 61 does not have an encoder, and the controller 8 controls the drive circuit 61 so that the drive circuit 61 rotates the drive shaft 62 of the motor 60 by a predetermined rotation angle. The motor 60 may be driven by the drive circuit 61. In this case, the controller 8 is driven by the drive circuit 61 by giving the drive circuit 61 a pulse signal having a number of pulses proportional to the magnitude of the rotation angle of the drive shaft 62, for example, by an open loop method. May be good. In this method, it is not necessary for the controller 8 to monitor the position information of the swing unit 4.

X Swing axis 1 Bending tester 3 Fixed unit 4 Swing unit 5 Shaft support unit 6 Drive unit 7 Counter 8 Controller 9 Detector 10 Test piece 31a 1st mounting surface 32 Fixture 42a 2nd mounting surface 43 Holding Tool 43a Eaves 48 Second spacer (adjustment member)
60 Motor 61 Drive circuit 80 Storage unit 81 Calculation unit

Claims (10)

The test piece is mounted on the first mounting surface on which the sheet-shaped test piece is placed, and in a state where the test piece extends from the first mounting surface to the outside of the first mounting surface. A fixing unit having a fixture to be fixed to the mounting surface,
A second mounting surface on which an extending portion extending from the first mounting surface of the test piece to the outside of the first mounting surface, which is juxtaposed with the first mounting surface, and the above. It has a holder that holds the extending portion of the test piece along the second mounting surface, and the test piece is placed over the first mounting surface and the second mounting surface. In this state, with respect to the fixed unit, around the swing axis arranged between the first mounting surface and the second mounting surface when viewed from a direction perpendicular to the first mounting surface. A swinging unit arranged so that it can swing,
A shaft support unit that supports the swing unit and a shaft support unit are provided.
The holder is a bending tester that holds the test piece while allowing relative movement of the rocking unit and the test piece along the second mounting surface as the rocking unit swings. The bending tester according to claim 1, wherein the holder holds one end of the test piece perpendicular to the swing axis so as to be slidable along the second mounting surface. The holder has an eaves portion arranged so as to face the second mounting surface, and holds the test piece between the second mounting surface and the eaves portion, claim 1 or 2. The bending tester described in. The shaft-supported portion of the swing unit pivotally supported by the shaft support unit is arranged outside the test piece placed on the second mounting surface in the direction along the swing axis. The bending tester according to any one of claims 1 to 3. The bending tester according to any one of claims 1 to 4, further comprising a counter for counting the number of swings when the swing unit is repeatedly rocked around the swing axis. The bending radius of the test piece when the test piece placed over the first mounting surface and the second mounting surface bends around the swing axis as the swing unit swings. The bending tester according to any one of claims 1 to 5, further comprising an adjusting member for adjusting the position of the swing unit with respect to the fixed unit so as to be adjustable. The swing unit with respect to the fixed unit within a range in which the angle between the first mounting surface and the second mounting surface on the side on which the test piece is mounted is 0 ° or more and 180 ° or less. The bending tester according to any one of claims 1 to 6, wherein the bending tester swings. A claim that the fixture is arranged outside the region of the fixing unit that overlaps with the swing unit in a state where the first mounting surface and the second mounting surface are arranged so as to face each other most closely. Item 2. The bending tester according to any one of Items 1 to 7. A drive unit that drives the swing unit so as to repeatedly swing the swing unit around the swing axis with respect to the fixed unit.
A detector that detects the position of the rocking unit around the rocking axis, and
The bending tester according to any one of claims 1 to 8, further comprising a controller for controlling the drive unit. The drive unit includes a motor that transmits a driving force to the swing unit and a drive circuit that drives the motor.
The bending tester according to claim 9, wherein the controller has a storage unit in which a control program is stored and a calculation unit that controls the drive circuit based on the control program.

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