Abrasion powder collection method and abrasion powder collection device
The method and apparatus use a suction device with anti-agglomeration powder to collect and analyze wear debris, addressing aggregation issues and enhancing evaluation accuracy.
Patent Information
- Application Number
- JP2024130200
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-08-06
- Publication Date
- 2026-02-19
AI Technical Summary
Accurate evaluation of Tire and Road Wear Particles (TRWP) is hindered by aggregation during generation and collection, making it difficult to assess their properties in a realistic state.
A method and apparatus using a suction device with an anti-agglomeration powder, such as silica, to collect wear debris by preventing aggregation through rotational friction between a wear drum and rubber pieces, with controlled suction power and supply flow rate.
Prevents wear debris aggregation, enabling effective collection and analysis of wear particles without interfering with the wear process, improving the accuracy of particle state evaluation.
Smart Images
Figure 2026027926000001_ABST
Abstract
Description
[Technical Field]
[0001] The present invention relates to a method and an apparatus for collecting wear debris. [Background technology]
[0002] Conventionally, various tests have been carried out regarding the friction between a tire and a road surface (see, for example, Patent Document 1).
[0003] Tire and Road Wear Particles (TRWP) are particles generated by friction between tires and the road surface during driving. Research into their physical and chemical properties and their effects is a topic that requires attention. [Prior art documents] [Patent documents]
[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-158448 Summary of the Invention [Problem to be solved by the invention]
[0005] When evaluating TRWP in a field environment, various factors are involved, making accurate evaluation difficult. Furthermore, the inventors have found that in an experimental environment, the TRWP particles aggregate during the process of generating and collecting them, making it difficult to conduct evaluations in a particle state equivalent to that in reality.
[0006] An object of the present invention is to provide a method and an apparatus for collecting abrasion powder that can collect the abrasion powder while preventing the abrasion powder from aggregating. [Means for solving the problem]
[0007] The gist and configuration of the present invention are as follows. (1) A method for collecting wear debris, comprising: a collection step of using a suction device to collect wear powder obtained by pressing rubber pieces against an abrasion drum and causing rotational friction; In the collecting step, an anti-agglomeration powder is supplied to a rotational friction surface between the wear drum and the rubber pieces, The supply flow rate of the agglomeration prevention powder is 0.5 to 6.0 (cm 3 / min). Here, "wear debris" includes all powder-like objects generated by the rotational friction of the wear drum and the rubber pieces. Therefore, the wear debris can be wear debris from the wear drum, wear debris from rubber pieces, or both. The wear debris can also take various forms. Examples include visible wear debris, aerosol-like wear debris, and combinations of these.
[0008] (2) The method for collecting wear powder according to (1) above, wherein the anti-agglomeration powder is silica.
[0009] (3) The method for collecting wear powder according to (1) above, wherein the anti-agglomeration powder is transparent or white.
[0010] (4) The method for collecting wear powder according to any one of (1) to (3), wherein the suction power of the suction machine is 100 to 1000 (W).
[0011] (5) A wear debris collection device, a wear drum configured to be able to press the rubber piece; a suction machine for suctioning wear powder; a supply unit that supplies anti-agglomeration powder to a rotational friction surface between the wear drum and the rubber pieces, The suction device includes a suction nozzle, The wear powder collecting device is characterized in that the suction nozzle is disposed directly below the rotating friction surface of the wear drum that rotates with the rubber pieces. [Effects of the Invention]
[0012] According to the present invention, it is possible to provide a method and an apparatus for collecting abrasion powder that can collect the abrasion powder while preventing the abrasion powder from aggregating. [Brief explanation of the drawings]
[0013] [Figure 1] 1 is a schematic diagram showing a configuration of a wear debris collecting device according to an embodiment of the present invention; [Figure 2] FIG. 10 is a diagram for explaining the difference in wear rate depending on whether or not a suction device is used. [Figure 3] FIG. 10 is a diagram illustrating the effect on the wear rate when the supply flow rate of silica is increased in the case where a suction machine is not used. [Figure 4] FIG. 10 is a diagram illustrating the effect on the wear rate when the supply flow rate of silica is increased when a suction machine is used. [Figure 5] FIG. 10 is a diagram for explaining the difference in weight of abrasion powder depending on whether or not a suction machine is used. [Figure 6] FIG. 10 is a diagram showing the percentage of collected wear particles having a diameter of more than 150 μm when a suction machine was not used. [Figure 7] FIG. 10 is a diagram showing the percentage of collected wear particles having a diameter of more than 150 μm when a suction machine is used. [Figure 8A] FIG. 10 is a diagram showing the state of wear particles observed with an optical microscope when no suction device is used and the silica supply flow rate is normal. [Figure 8B] FIG. 10 is a diagram showing the state of wear particles observed with an optical microscope when a suction machine is used and the silica supply flow rate is set to a normal level. [Figure 8C] FIG. 10 is a diagram showing the state of wear particles observed with an optical microscope when a suction machine is not used and the silica supply flow rate is increased to about 10 times the normal rate. [Figure 8D] FIG. 10 is a diagram showing the state of wear particles observed with an optical microscope when a suction machine is used and the silica supply flow rate is increased to about 10 times the normal rate. [Figure 9] FIG. 1 is a schematic diagram illustrating an example of an observation device for wear particles. [Figure 10A] FIG. 10 is a diagram showing the particle size distribution of wear particles observed using the apparatus of FIG. 9 when no suction machine is used and the silica supply flow rate is normal. [Figure 10B] FIG. 10 is a diagram showing the particle size distribution of wear particles observed using the apparatus of FIG. 9 when a suction machine is not used and the silica supply flow rate is set to about 10 times the normal rate. [Figure 10C] FIG. 10 is a diagram showing the particle size distribution of wear particles observed using the device of FIG. 9 when a suction machine is used and the silica supply flow rate is set to a normal value. [Figure 10D] FIG. 10 is a diagram showing the particle size distribution of wear particles observed using the apparatus of FIG. 9 when a suction machine is used and the silica supply flow rate is set to about 10 times the normal rate. DETAILED DESCRIPTION OF THE INVENTION
[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. For convenience, an embodiment of a wear debris collecting device of the present invention will be described first.
[0015] <Wear debris collection device> Fig. 1 is a schematic diagram showing the configuration of a wear debris collection device according to one embodiment of the present invention. As shown in Fig. 1, this wear debris collection device 1 includes a wear drum 2 configured to be able to press a rubber piece 3 against it, a suction device 6 that sucks up the wear debris, and a supply unit 5 that supplies anti-aggregation powder (not shown) to the rotating friction surface 4 between the wear drum 2 and the rubber piece 3.
[0016] The wear drum 2 is configured to be rotatable around its axis, and as the wear drum 2 rotates while pressing the rubber pieces 3 against the wear drum 2, the wear drum 2 and the rubber pieces 3 undergo rotational friction on the rotating friction surface 4. The diameter of the wear drum 2 is not particularly limited, but is preferably larger than the diameter of the rubber pieces 3, and can be, for example, 15 to 35 cm.
[0017] The rubber piece 3 is a test piece used in the wear debris collection device 1. The rubber piece 3 can be, for example, a replica of tire rubber, and can be made by cutting out a portion of the tread portion, or by using the same tread rubber that makes up the tread portion. The rubber piece 3 preferably has an annular shape that rotates around an axis like a tire. The rubber piece 3 is also configured to be rotatable around an axis. The diameter of the rubber piece 3 is not particularly limited, but is preferably smaller than the diameter of the wear drum 2, and can be, for example, 4 to 10 cm. As a result, the wear drum 2 and the rubber piece 3 rotate while pressing the rubber piece 3 against the wear drum 2, causing the wear drum 2 and the rubber piece 3 to rotate relative to each other, resulting in rotational friction between the wear drum 2 and the rubber piece 3 at the rotating friction surface 4.
[0018] Any known mechanism for rotating the wear drum 2 and the rubber piece 3 around the axis can be used.
[0019] The rotational friction surface 4 is the surface where the wear drum 2 and the rubber piece 3 undergo rotational friction when the collection device 1 is in use.
[0020] The supply unit 5 is configured to supply anti-agglomeration powder (not shown) to the rotating friction surface 4 between the wear drum 2 and the rubber pieces 3. For example, as shown in the figure, the supply unit 5 can be disposed above the rotating friction surface 4 between the wear drum 2 and the rubber pieces 3. As an example, the supply unit 5 can be a supply nozzle, but is not limited to this.
[0021] The anti-agglomeration powder is a powder that has the function of preventing the aggregation of wear powder generated by the rotational friction between the wear drum 2 and the rubber pieces 3. It is most preferable to use silica as such an anti-agglomeration powder. However, other powders such as quartz can also be used as the anti-agglomeration powder. The anti-agglomeration powder is preferably transparent or white in color.
[0022] The suction device 6 is configured to suck up wear powder generated by the rotational friction between the wear drum 2 and the rubber pieces 3. The suction device 6 is equipped with a suction nozzle 6a, which is disposed directly below the rotational friction surface 4 between the wear drum 2 and the rubber pieces 3 (for example, 0.5 to 5 cm below, although this is not particularly limited as it depends on factors such as the suction force).
[0023] A base (not shown) may be used to place the wear drum 2 and rubber piece 3 (and their rotation mechanism), which allows for better compatibility with the experimental environment. In the present disclosure, the wear debris collection device 1 does not necessarily have to have a base.
[0024] <Method for collecting wear debris> Next, a method for collecting wear debris according to one embodiment of the present invention will be described. The method for collecting wear debris according to this embodiment is not particularly limited, but as an example, it can be performed using the wear debris collection device 1 according to the above-described embodiment.
[0025] The method for collecting wear powder in this embodiment includes a collection step in which rubber pieces 3 are pressed against a wear drum 2 to cause rotational friction, and the resulting wear powder is then sucked and collected by a suction device 6. Details of the rotational friction between the wear drum 2 and the rubber pieces 3 in the collection step have already been explained in the embodiment of the wear powder collection device, so further explanation will be omitted.
[0026] The suction power of the suction machine 6 is preferably 100 to 1000 (W). By setting the suction power to 100 W or more, it is possible to prevent the scattering of wear powder caused by the rotation of the wear drum 2 and rubber pieces 3 and to recover most of the generated powder, while by setting the power to 1000 W or less, the anti-agglomeration powder is more appropriately adhered to the rotating friction surface 4 between the wear drum 2 and rubber pieces 3, making it possible to more effectively prevent the agglomeration of wear powder.
[0027] In the collection process, anti-agglomeration powder is supplied to the rotating friction surface 4 between the wear drum 2 and the rubber pieces 3. It is most preferable that the anti-agglomeration powder be silica. This is because supplying the anti-agglomeration powder causes little change in the wear pattern of the rubber pieces 3 and provides an effective anti-agglomeration effect for the wear powder. However, other powders such as quartz can also be used as the anti-agglomeration powder. It is preferable that the anti-agglomeration powder be transparent or white in color.
[0028] The supply flow rate of the anti-agglomeration powder is 0.5 to 6.0 cm 3 / min). The supply flow rate is 0.5 cm 3 If the supply flow rate is less than 6.0 cm / min, the effect of preventing the aggregation of wear particles cannot be obtained. 3 If the speed exceeds 1 / min, a large amount of the anti-aggregation powder will adhere to the surface of the rubber piece 3, reducing the coefficient of friction and inhibiting the wear phenomenon.
[0029] When the agglomeration prevention powder is silica, the BET specific surface area is not particularly limited, but is, for example, 50 to 250 (m 2 / g).
[0030] <Action and effect> The effects of the wear debris collecting device and the wear debris collecting method of the above embodiment will be described below. For convenience, the effects of the wear debris collecting method will be described first.
[0031] The present inventors conducted a test to evaluate the influence of the use or non-use of a suction machine and the amount of anti-agglomeration powder (silica) supplied on the wear rate.
[0032] Figure 2 is a diagram illustrating the difference in wear rate depending on whether or not a vacuum cleaner is used. Figure 2 shows the wear rate when collecting wear debris using the wear debris collection device shown in Figure 1, with and without a vacuum cleaner, for two types of rubber pieces. As shown in Figure 2, the wear rate was almost the same when a vacuum cleaner was used and when it was not used.
[0033] Figure 3 is a diagram illustrating the effect on the wear rate when the silica supply flow rate is increased when a suction device is not used, and Figure 4 is a diagram illustrating the effect on the wear rate when a suction device is used and a silica supply flow rate is increased. As shown in Figure 3, when the suction machine was not used, the amount of wear decreased as the silica supply flow rate increased. This is presumably because the wear phenomenon was inhibited by the retention of silica due to the excessive supply of silica to the rotating friction surface. On the other hand, when the suction machine was used, the amount of wear remained almost unchanged even when the silica supply flow rate was increased, as shown in Figure 4. This is thought to be because the suction machine was able to suppress the accumulation of silica as described above. From the above, it was found that by using a suction machine in combination with increasing the silica supply flow rate, it is possible to conduct a wear test without interfering with the wear phenomenon, and to collect the wear powder produced during the test.
[0034] Next, tests were conducted to evaluate the amount of collected wear particles and their particle size distribution. Fig. 5 is a diagram illustrating the difference in weight of wear particles depending on whether or not a vacuum cleaner is used. Fig. 6 is a diagram illustrating the proportion of wear particles with a diameter of over 150 μm collected when a vacuum cleaner is not used. Fig. 7 is a diagram illustrating the proportion of wear particles with a diameter of over 150 μm collected when a vacuum cleaner is used. Here, the "slip ratio (%)" on the horizontal axis means the value obtained by dividing the difference between the peripheral speed of the rubber piece and the peripheral speed of the wear drum by the peripheral speed of the wear drum.
[0035] As shown in Figure 5, when the suction machine was used, the amount (weight) of collected wear debris increased compared to when the suction machine was not used. Also, as shown in Figure 6, when the suction machine was not used, the proportion of large-diameter wear debris increased when the amount of silica supplied was increased. In contrast, as shown in Figure 7, when the suction machine was used, the proportion of large-diameter wear debris did not increase even when the amount of silica supplied was increased.
[0036] Fig. 8A is a diagram showing the state of wear debris observed under an optical microscope when a suction device is not used and the silica supply flow rate is normal. Fig. 8B is a diagram showing the state of wear debris observed under an optical microscope when a suction device is used and the silica supply flow rate is normal. Fig. 8C is a diagram showing the state of wear debris observed under an optical microscope when a suction device is not used and the silica supply flow rate is increased to about 10 times the normal rate. Fig. 8D is a diagram showing the state of wear debris observed under an optical microscope when a suction device is used and the silica supply flow rate is increased to about 10 times the normal rate. As shown in Figures 8A to 8D, when a suction machine was used and the silica supply flow rate was increased to about 10 times the normal rate (Figure 8D), it was observed that the aggregation of wear powder was successfully prevented.
[0037] FIG. 9 is a schematic diagram showing an example of an observation device for wear debris. This observation device includes a plate 10, a disperser 11, a sample cup 12, a white plate 13, an illuminator 14, and an imaging device 15. The plate 10 is preferably colorless and transparent, and can be, for example, a glass plate. The disperser 11 can be a known disperser (e.g., a vacuum disperser) capable of dispersing wear debris. The sample cup 12 is a container for storing the collected wear debris. The white plate 13 is a white plate placed below the plate 10. The illuminator 14 is a lighting fixture capable of irradiating light toward the plate 10. The imaging device 15 can be any known camera.
[0038] In this observation device, wear debris supplied from a sample cup 12 is dispersed by a disperser 11 and collected on a plate 10. Light emitted from an illuminator 14 passes through the plate 10 and is reflected by a white plate 13, and the reflected light is imaged by an imaging device 15. In this case, the wear debris dispersed on the plate 10 on the white plate 13 is imaged from above; the wear debris is black and therefore observed as particles, whereas silica is white and therefore not observed as particles. This makes it possible to analyze the wear debris without post-processing using software or the like.
[0039] Figure 10A shows the particle size distribution of wear particles observed using the apparatus of Figure 9 when a suction device is not used and the silica supply flow rate is normal. Figure 10B shows the particle size distribution of wear particles observed using the apparatus of Figure 9 when a suction device is not used and the silica supply flow rate is about 10 times normal. Figure 10C shows the particle size distribution of wear particles observed using the apparatus of Figure 9 when a suction device is used and the silica supply flow rate is normal. Figure 10D shows the particle size distribution of wear particles observed using the apparatus of Figure 9 when a suction device is used and the silica supply flow rate is about 10 times normal. As shown in FIGS. 10A to 10D, when a suction machine was used and the silica supply flow rate was increased to about 10 times the normal rate (FIG. 10D), it was observed that aggregation of wear particles was successfully prevented. Furthermore, based on the consistency with the results shown in FIGS. 8A to 8D, it can be said that the observation device shown in FIG. 9 made it possible to observe wear debris in a simple manner. In this test, the observation device used was a DW-3000 manufactured by Jasco International Co., Ltd.
[0040] The method for collecting wear powder of this embodiment includes a collection step in which rubber pieces 3 are pressed against a wear drum 2 to cause rotational friction, and the resulting wear powder is collected by suction using a suction device 6. In the collection step, a coagulation prevention powder is supplied to the rotational friction surface between the wear drum 2 and the rubber pieces 3, and the supply flow rate of the coagulation prevention powder is 0.5 to 6.0 (cm 3 / min). Taking into account the above test results, the method for collecting wear powder of this embodiment can effectively prevent the wear powder from aggregating by sucking the wear powder with the suction machine 6 while supplying anti-agglomeration powder at a sufficient supply flow rate. In addition, the supply flow rate is 0.5 cm 3 If the supply flow rate is less than 6.0 cm / min, the effect of preventing the aggregation of wear particles cannot be obtained. 3 If the speed exceeds 1 / min, a large amount of the anti-aggregation powder will adhere to the surface of the rubber piece 3, reducing the coefficient of friction and inhibiting the wear phenomenon.
[0041] In addition, the wear powder collection device 1 of this embodiment is equipped with a wear drum 2 configured to be able to press rubber pieces 3 against it, a suction machine 6 that sucks up the wear powder, and a supply unit 5 that supplies anti-agglomeration powder to the rotating friction surface 4 between the wear drum 2 and the rubber pieces 3, and the suction machine 6 is equipped with a suction nozzle 6a, which is positioned directly below the rotating friction surface 4 between the wear drum 2 and the rubber pieces 3. This makes it possible to supply the anti-agglomeration powder at a sufficient supply flow rate while sucking the wear powder with the suction device 6, thereby effectively preventing the wear powder from agglomerating.
[0042] <Wear debris observation device> An example of an observation device for wear debris includes a plate 10 , a disperser 11 , a sample cup 12 , a white plate 13 , an illuminator 14 , and an imaging device 15 .
[0043] <How to observe wear debris> In one example of a method for observing wear debris, wear debris supplied from a sample cup 12 is dispersed by a disperser 11 and collected on a plate 10. Light emitted from an illuminator 14 passes through the plate 10 and is reflected by a white plate 13, and the reflected light is imaged by an imaging device 15.
[0044] [Contribution to the United Nations-led Sustainable Development Goals (SDGs)] The SDGs have been proposed to realize a sustainable society. One embodiment of the present invention is expected to be a technology that contributes to goals such as "No. 12: Responsible Consumption and Production" and "No. 13: Take concrete action against climate change." [Explanation of symbols]
[0045] 1: Wear debris collection device, 2: wear drum, 3: Rubber piece, 4: Rotating friction surface, 5: Supply department, 6: Suction machine, 10: Plate, 11:Distributor, 12: sample cup, 13: White board, 14: Illuminator, 15: Imaging device
Claims
1. A method for collecting wear debris, comprising: a collection step of using a suction device to collect wear powder obtained by pressing rubber pieces against an abrasion drum and causing rotational friction; In the collecting step, an anti-agglomeration powder is supplied to a rotational friction surface between the wear drum and the rubber pieces, The supply flow rate of the agglomeration prevention powder is 0.5 to 6.0 (cm ３ / min).
2. 2. The method for collecting wear debris according to claim 1, wherein the agglomeration prevention powder is silica.
3. 2. The method for collecting wear debris according to claim 1, wherein the agglomeration prevention powder is transparent or white.
4. 3. The method for collecting wear debris according to claim 1, wherein the suction power of the suction machine is 100 to 1000 (W).
5. A wear debris collection device, a wear drum configured to be able to press the rubber piece; a suction machine for suctioning wear powder; a supply unit that supplies anti-agglomeration powder to a rotational friction surface between the wear drum and the rubber pieces, The suction device includes a suction nozzle, The wear powder collecting device is characterized in that the suction nozzle is disposed directly below the rotating friction surface of the wear drum that rotates with the rubber pieces.
Citation Information
Patent Citations
Rubber tester
JP2011158448A