JP2012202811A - Abrasion testing method of rubber material or the like and abrasion testing device used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for abrasion testing of rubber material by which evaluation can be performed in a state similar to a phenomenon in an actual use.SOLUTION: In an abrasion testing method of rubber material, test pieces of a rubber material fixed to a rotating body are abraded by an abrasive material, air is blown to the abraded test pieces to remove abrasion dust, and the test pieces are abraded again by the abrasive material. After repeating this procedure, the amount of abrasion of the test pieces is measured. A plurality of test pieces can be fixed to the rotating body, and the plurality of test pieces can be abraded by one type of abrasion material. The abrasion by an abrasive material can be performed by injecting a powdery material to the surface of the test pieces.

Description

  The present invention relates to a wear test method for various rubber products, thermoplastic elastomer products, rubbers used in plastic products, thermoplastic elastomers and plastics (hereinafter referred to as “rubber material”), and a wear test apparatus used therefor. .

  In general, there are various methods for the wear test of rubber materials, which are standardized by JIS. In general, the amount of wear of a test piece is represented by a change in weight or thickness by moving either or both of the test piece and the wear material (cloth, paper, metal, etc.).

  For example, a test method in which a test piece is pressed and worn against a wear surface of a rotating drum or a rotating disk wound with a wear cloth with a constant force and the amount of wear of the test piece is measured is widely used as a DIN wear test method. These test methods are incorporated in ISO standards and JIS standards as test methods for rubber materials.

  In addition, as a method for testing the wear of rubber materials for conveyor belts, a method is known in which a granular material is sprayed toward a test piece for a required time and durability is evaluated based on the weight of the test piece reduced by the injection of the granular material. ing. Such a test method is described in Japanese Patent Application Laid-Open No. 2008-224510.

JP 2008-224510 A

  By the way, in the test method in which the test piece is pressed against the wear surface of the rotating drum or the rotating disk, since the wear material that has once contacted the test piece is repeatedly contacted, the wear debris generated by the wear adheres to the wear material as it is. And reduce the function of the wear material. There is a problem that the wear material having a reduced function affects the measurement of the amount of wear, and the measurement results vary.

  Further, in the test method described in Patent Document 1, since a granular material is injected for a predetermined time toward a test piece made of a fixed rubber material, there is a problem that it takes time to evaluate several types of test pieces. is there. If the injection pressure of the granular material is increased or the injection amount is increased in order to shorten the time, heat is generated in the test piece, which is different from the test environment of other test pieces. Moreover, depending on conditions, such as the hardness of a test piece, the magnitude | size of a powdery material, and an injection pressure, there exists a possibility that a part of powdery material may remain in the state adhering to the test piece. Even if it is continuously sprayed on the remaining powdery substance, the evaluation of wear does not match the actual.

  The present invention has been made in view of the present situation. When a wear test of a rubber material is performed, it is important to simulate the test result in a state close to a phenomenon when it is actually used. This invention wears by spraying a powdery material etc. toward a test piece, and after blowing air to a test piece and removing powdery material and wear debris on the surface, it is again powdery toward a test piece. The present invention provides a wear test method for a rubber material which is worn by spraying an object and a test apparatus used therefor.

  Moreover, in order to achieve the said objective, it was set as the following structures. That is, the rubber material wear test method according to the present invention is a method in which a rubber material test piece attached to a horizontal surface of a rotating body is worn by a wear material, and air is injected toward the worn test piece to wear debris. The test piece is characterized by measuring the amount of wear of the test piece after repeating wear and air blowing with the wear material again. A plurality of test pieces can be attached to the horizontal surface of the rotating body, and the plurality of test pieces can be worn by a kind of wear material. Further, a powdery material is used as the wear material, and the surface of the test piece can be worn by spraying the powdery material toward the surface of the test piece.

  The rubber material wear test apparatus according to the present invention has the following configuration in order to achieve the above object. That is, a rotating body having a horizontal surface to which a rubber material test piece is attached, a driving device for driving the rotating body, a wear material for wearing the test piece surface attached to the horizontal surface of the rotating body, and the test piece surface And an air gun for removing wear debris. The horizontal surface of the rotating body is preferably formed so that a plurality of test pieces can be attached. Moreover, it can be set as the structure which uses a powdery material as an abrasion material which wears the test piece surface, and sprays this powdery material toward the surface of a test piece from an injection gun.

  According to the present invention, since the wear material wears a new surface free of wear debris, it can be tested in an environment close to the phenomenon in actual use. In addition, since a plurality of test pieces can be simultaneously tested under the same environment, variations in test results can be suppressed.

It is a schematic perspective view which shows the structure of the abrasion test apparatus which shows 1st Embodiment of this invention. It is a schematic perspective view which shows the structure of the abrasion test apparatus which shows 2nd Embodiment.

  Below, the abrasion test apparatus which concerns on this application is demonstrated based on drawing. FIG. 1 shows a wear test apparatus in the first embodiment. The test apparatus 1A is directed to a rotating drum 1 that is a rotating body to which a rubber material test piece is attached, a gantry 2 on which the rotating drum 1 is mounted, a driving device 3 that rotationally drives the rotating drum 1, and a test piece. And an injection device 4 that injects air toward the surface of the worn test piece.

  The rotating drum 1 is a hollow cylindrical body, and a mounting plate 11 having a horizontal surface to which a test piece made of a rubber material is attached on one side surface. The test piece mounting plate 11 is configured so that a plurality of different or the same kind of test pieces can be attached at the same time, and rotates integrally with the rotating drum 1. By allowing a plurality of test pieces to be attached to the test piece attachment plate 11 at the same time, it is possible to perform a wear test in the same environment of different or the same kind of test pieces.

  In the gantry 2, two rotatable rollers 22 on which the rotary drum 1 is placed are arranged in parallel on the upper ends of the four columns 21, and a pulley 23 is attached to one of the rollers 22. ing. When the pulley 23 rotates, the roller 22 to which the pulley 23 is attached also rotates together. When the roller 22 rotates, the mounted rotating drum 1 also rotates.

  Therefore, the roller 22 to which the pulley 23 is attached and the roller 22 to which the pulley 23 is not attached rotate in the same direction via the rotary drum 1. The interval between the two parallel rollers 22 may be determined according to the size of the rotary drum 1 as long as the rotary drum 1 can be placed in a stable state.

  The driving device 3 includes a motor 32 installed on a support base 31, and is configured such that a belt 35 is wound around a pulley 34 fixed to a rotation shaft 33 of the motor 32. The belt 35 is wound between the pulley 34 and the pulley 23 of the roller 22. Therefore, when the motor 32 is operated, the pulley 34 is rotated, the roller 22 is rotated together with the pulley 23 via the belt 35, and the rotating drum 1 is also rotated at the same time.

  Next, the injection device 4 will be described. The injection device 4 includes an injection gun 41 that injects a powdery substance and an air gun 42 that injects air. The injection gun 41 has a nozzle having an injection port 41a at the tip, and is connected to a tank 43 for storing a powdery substance via a supply pipe 44, and further to a compressor 45 that is a compressed air supply device. The air supply pipe 46 is connected.

  A nozzle at the tip of an air supply pipe 46 is opened in the spray gun 41 so that compressed air from the compressor 45 is discharged. Particulate matter is supplied from the tank 43 into the injection gun 41, and the powdery matter supplied from the supply pipe 44 protrudes from the nozzle and is jetted from the injection port 41a toward the test piece by compressed air.

  The injection port 41a of the injection gun 41 can be freely changed in the vertical and horizontal directions by a driving mechanism (not shown), and the distance L between the injection port 41a and the test piece and the angle α of the injection port with respect to the surface of the test piece. Are also arranged to be arbitrarily changeable. For example, the distance L between the injection port 41a and the test piece can be about 130 mm, and the angle α of the injection port with respect to the test piece surface can be about 60 degrees.

  Moreover, the tank 43 can supply a powdery substance to the injection gun 41 by a predetermined amount, and the powdery substance injected to the test piece can be collected by a device (not shown). Further, the collected powdery material may be stored in a separately installed container, or may be configured to return to the tank 43 again.

  The air gun 42 is provided with a nozzle having an injection port 42a at the tip, and is connected to a compressor 45, which is a compressed air supply device, via a branched supply pipe 47. The jet port 42a of the air gun 42 can be freely changed in the vertical and horizontal directions by a driving mechanism (not shown), and is arranged so that the distance from the test piece can be arbitrarily changed.

  The compressed air supplied from the compressor 45 is blown onto the surface of the test piece on which the powdery material is jetted by the air gun 42, and the powdery material and wear debris on the test piece are removed. The air gun 42 may spray the compressed air onto the test piece either immediately after the powdered material is jetted or may be the test piece just before being jetted. The compressor 45 has a known configuration, and can supply, for example, an air pressure of 5.3 MPa to the nozzle.

  In the test apparatus 1A, the rotating drum 1 provided with the mounting plate 11 is placed on the roller 22, and the rotating drum 1 placed on the roller 22 is rotated by the driving device 3 via the roller 22. However, the mechanism for rotating the rotary drum 1 is not limited to the above embodiment. For example, a configuration may be adopted in which a rotating shaft is directly provided on the rotating drum 1, a pulley is attached to the rotating shaft, and the rotating drum 1 is directly rotated by a belt wound between the pulley and the pulley of the driving device 3.

  In the above-described embodiment, the test piece mounting plate 11 is disposed perpendicular to the side surface of the rotary drum 1. However, the test piece mounting plate 11 is configured so that the rotary drum 1 stands vertically and rotates in the horizontal direction. May be disposed on the upper surface of the rotating drum 1 that rotates horizontally.

  When a wear test of a rubber material is performed by the test apparatus 1A having the above-described configuration, first, the weight of the test pieces A to D is measured, and then attached to a predetermined position of the test piece mounting plate 11. Next, the distance L (for example, 130 mm) between the spray port 41a of the spray gun 41 and the test piece and the angle α (for example, 60 degrees) with the surface of the test piece of the spray port 41a are set. Next, the driving device 3 is operated to rotate the rotary drum 1 through the belt 35 and the roller 22. After rotating the rotating drum 1, the powdered material is sprayed from the spray gun 41 toward the test pieces A to D attached to the test piece mounting plate 11.

  Subsequently, compressed air with a predetermined pressure is blown from the air gun 42 toward the test pieces A to D on which the powdery material has been jetted. At this time, the air pressure can be set to a predetermined value. For example, the air pressure can be set to 5.3 MPa. By blowing compressed air, powdery substances and wear debris adhering to the test piece can be removed.

  Moreover, since the test pieces A to D are rotating, each test piece is not always continuously sprayed with powdery substances, but is once separated from the injection of powdery substances. The heat of the surface of the piece can be dissipated. Furthermore, in this invention, since compressed air is sprayed toward the test pieces A to D on which the powdery material is jetted, not only the powdery materials and wear debris on the surface of the test piece but also the test pieces A to D are removed. The surface temperature will be lowered.

  After repeating spraying of powdery substances and blowing of compressed air for a predetermined time, the test pieces A to D are removed from the mounting plate 11 and the weight of each test piece is measured. Subsequently, the weight change of the test pieces A to D decreased by the injection of the powdery material is calculated, and the wear resistance of each test piece is relatively evaluated.

  As described above, according to the rubber material wear test method of this embodiment, a large impact is applied to the surfaces of the test pieces A to D by a plurality of injections of the powder, and the impact of the test pieces A to D is caused by this impact. The surface is worn. And since injection of a powdery material is performed with respect to the new surface which removed the powdery material etc. by spraying of compressed air, evaluation by simulation close | similar to the phenomenon actually used can be performed.

  Next, a second embodiment of the present invention will be described with reference to FIG. The test apparatus 1B shown in FIG. 2 is a vertical wear test apparatus that presses an abrasive with a constant force against a moving test piece. The test apparatus 1B includes a turntable 5 that is a rotating body to which a test piece is attached, a drive device 6 that rotates the turntable 5, a wear wheel 7 that wears the test piece attached to the turntable 5, and air that blows air onto the test piece. It is comprised by the injection apparatus 8.

  The turntable 5 is integrally provided with a mounting plate 52 for attaching a test piece made of a rubber material to the surface of the turntable 51. The mounting plate 52 has a horizontal surface and is configured so that a plurality of test pieces of different types or the same type can be attached at the same time. By allowing the test piece mounting plate 52 to attach a plurality of test pieces at the same time, it is possible to perform a wear test of different or the same type of test pieces in the same environment.

  The turntable 51 is supported by a rotary shaft 53, and the rotary shaft 53 is provided with a pulley 54 around which a belt is wound. Of course, the rotating shaft 53 is supported by a bearing (not shown).

  The driving device 6 is configured by fixing a pulley 63 to a rotating shaft 62 of a motor 61 installed on a predetermined table (not shown), and winding a belt 64 between the pulley 63 and the pulley 54. Therefore, when the motor 61 is operated, the pulley 63 rotates, and the turntable 51 rotates together with the pulley 54 via the belt 64. A description of a known configuration such as a reduction gear box disposed on the rotating shaft 62 of the motor 61 will be omitted.

  The wear wheel 7 has a rotating shaft 71 and a roller 72 for attaching a wear material, and the rotating shaft 71 is rotationally driven by a driving device (not shown). The roller 72 is pressed against the test piece attached to the attachment plate 52 with a constant force, and wears the test piece by giving a constant angle to the rotating shaft 71. Therefore, the roller 72 is configured to be able to arbitrarily change the pressing force, angle, forward / reverse rotation, etc., on the test piece.

  In this second embodiment, the roller 72 and the test piece of the wear wheel 7 are rotated independently of each other, so that the slip rate, the rotation speed, the pressing force, etc. can be arbitrarily selected, and the test can be performed over a wide range and under severe conditions. Is possible.

  Next, the air injection device 8 includes an air gun 82 provided with a nozzle having an injection port 81 at the tip and a compressor 83 which is a compressed air supply device. The air gun 82 and the compressor 83 are connected via a supply pipe 84. Are connected. The jet port 81 of the air gun 82 can be freely changed in the front-rear and left-right directions by a drive mechanism (not shown), and is disposed so that the distance from the test piece can be arbitrarily changed.

  When performing the abrasion test of the rubber material by the test apparatus 1B having the above-described configuration, first, after measuring the weight of the test piece, the test piece is attached to a predetermined position of the test piece mounting plate 52. Next, a wear material is wound around the wear wheel 7 to set the pressing force, angle, rotation speed, and the like of the roller 72 of the wear wheel 7, and the distance from the test piece of the injection port 81 of the air injection device 8 Set the angle to the surface, air pressure, etc. Next, the driving device 6 is operated to rotate the test pieces A ′ to D ′ attached to the attachment plate 52 together with the turntable 51 via the belt 64.

  Next, the wear wheel 7 is operated to bring the roller 72 into contact with the rotating test piece. Subsequently, compressed air of a predetermined pressure is blown from the air gun 82 toward the test piece worn by the roller 72. The abrasion waste adhering on the test pieces A ′ to D ′ can be removed by blowing compressed air.

  Also in this embodiment, since the test pieces are rotating and moving, each test piece is not continuously worn by the roller 72, so the heat of the surface of the test piece is dissipated. be able to. Further, since compressed air is blown from the air gun 82 toward the worn test piece, not only the wear debris on the surface of the test piece is removed, but also the surface temperature of the test piece is lowered. In addition, the same effects as those of the first embodiment can be achieved.

Below, the comparative example and Example of an abrasion test of a urethane rubber sheet are demonstrated.
<Comparative example>
In the testing machine, a test piece is pressed against the abrasive paper wound around a rotating drum with a constant load to be worn. A wear tester manufactured by the applicant was used as the NBS wear tester. With the NBS abrasion tester, the abrasion resistance per test piece thickness of 2.54 mm (0.1 inch) was measured from the number of revolutions of the drum. The multiplying number on the testing machine is 3, and the size of the test piece is 25 mm × 25 mm × thickness 6.35 mm. The number of revolutions of the drum was 45 ± 5 rpm, and three weights for 2.265 gf were used. The test results are as shown in Table 1.

<Example 1>
The rotating drum type wear tester shown in FIG. 1 was used as the tester. The test specimens were 5 strips each having a width of 25.4 mm, a length of 110 mm, and a thickness of 1 mm, and affixed to the mounting plate with double-sided tape. The distance L between the test piece and the injection port 41a of the injection gun 41 was 120 mm, the injection angle with the surface of the test piece was 60 degrees, the air pressure was set to 5.3 MPa, and the rotational speed of the rotary drum 1 was 10 rpm. . Nitchu steel grit (trade name) (product number: G140H, manufactured by Niche Corporation) was used as the powder to be blasted. The test time was 4 hours.

<Example 2>
Test machine, size of test piece, attaching method, distance L between test piece and injection port 41a of injection gun 41, injection angle with test piece surface, air pressure, number of rotation of rotating drum, kind of powdery substance, etc. Is the same as in Example 1. Only the test time was 8 hours. The test results are shown in Table 1.

  As is apparent from Table 1, a large number of samples can be tested simultaneously, and relative evaluation without variation can be performed in the same test environment as compared with the comparative example.

1A, 1B: Test device 1: Rotating drum 2: Mounting base 3: Drive device 4: Injection device 5: Turntable
6: Drive device 7: Wear wheel 8: Injection device 11: Test piece mounting plate 21: Support 22: Roller 23: Pulley 31: Stand 32: Motor 33: Rotating shaft 34: Pulley 35: Belt 41: Injection gun 41a: Injection Port 42: Air gun 43: Tank 44: Supply pipe 45: Compressor 46: Air supply pipe 51: Turntable 52: Test piece mounting plate 61: Motor 62: Rotating shaft 63: Pulley 64: Belt 71: Rotating shaft 72: Roller 81 : Injection port 82: Air gun 83: Compressor 84: Supply pipe

Claims (6)

  A test piece of rubber material attached to a rotating body is worn by a wear material, air is sprayed toward the worn test piece to remove wear debris, and the test piece is repeatedly worn by the wear material. A wear test method for rubber material, characterized by measuring the amount of wear of rubber.   The rubber material wear test method according to claim 1, wherein a plurality of test pieces are attached to the rotating body, and the plurality of test pieces are worn by a kind of wear material.   The method for testing wear of a rubber material according to claim 1 or 2, wherein the wear by the wear material is performed by spraying a powdery material onto the surface of the test piece.   A rotating body having a surface to which a test piece of rubber material is attached, a driving device for driving the rotating body, a wear material for wearing the surface of the test piece, and an air gun for removing wear debris on the surface of the test piece. A wear test apparatus for rubber materials, characterized by comprising:   5. The rubber material wear test apparatus according to claim 4, wherein the test piece mounting surface of the rotating body is formed so that a plurality of test pieces can be mounted.   6. The wear test apparatus for rubber material according to claim 4, wherein the wear material for abrading the surface of the test piece is a powdered material sprayed from a spray gun.

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