Abrasive tool

Abstract

To provide a polishing tool which inhibits uneven distribution of an abrasive powder in a pipe.SOLUTION: A polishing tool 10 polishes an inner wall surface W1a of a pipe W1. The polishing tool 10 includes: a first sandwiching part 1; a second sandwiching part 2; multiple polishing bodies 3 disposed between the first sandwiching part 1 and the second sandwiching part 2 and sandwiched between the first sandwiching part 1 and the second sandwiching part 2; approaching means which causes the first sandwiching part 1 and the second sandwiching part 2 to approach each other; and a capsule 6 which contains an abrasive powder 7 therein. The capsule 6 is disposed between the multiple polishing bodies 3.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to abrasive tools, and more particularly to abrasive tools for polishing the inner wall surface of a pipe.

Background Art

[0002] Patent Document 1 discloses an abrasive tool provided with abrasive bodies. The abrasive bodies are discretely fixed to a synthetic resin filamentous core material. While flowing an abrasive grain slurry in which abrasive grains are dispersed in water inside a metal pipe, the abrasive tool is inserted inside the metal pipe and the core material is pulled to polish the inner diameter surface of the metal pipe.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The inventors of the present application have found the following problems. When polishing the inner wall surface of a pipe using such an abrasive tool, while flowing an abrasive grain slurry inside the pipe, the abrasive tool is inserted inside the pipe. A plurality of abrasive bodies located on the upstream side may retain only the abrasive grains in the abrasive grain slurry. As a result, the abrasive grain slurry has the abrasive grains removed and water remaining. The abrasive bodies located on the downstream side are supplied with water but hardly supplied with abrasive grains. As a result, the distribution of the abrasive grains in the pipe is uneven. There is a risk that a portion of the pipe where the abrasive grains are insufficient cannot be polished sufficiently.

[0005] An object of the present invention is to provide an abrasive tool that suppresses uneven distribution of an abrasive agent in a pipe in view of the above problems.

Means for Solving the Problems

[0006] The abrasive tool according to the present invention is A polishing tool for polishing the inner wall surface of a pipe, a first clamping portion, a second clamping portion, a plurality of polishing bodies disposed between the first clamping portion and the second clamping portion and clamped by the first clamping portion and the second clamping portion, proximity means (for example, strings 4, 5, etc.) for bringing the first and second clamping portions closer to each other, and a capsule containing a polishing agent, wherein the capsule is disposed between the plurality of polishing bodies.

[0007] According to such a configuration, the first and second clamping portions are brought closer to each other, and the plurality of polishing bodies press the capsule. By this pressing, the capsule is broken and the polishing agent is discharged to the outside of the capsule. As a result, the polishing agent can be supplied between the plurality of polishing bodies. Therefore, it is possible to suppress the uneven distribution of the polishing agent in the pipe.

Advantages of the Invention

[0008] The present invention can suppress the uneven distribution of the polishing agent in the pipe.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0010] Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. Also, for clarity of explanation, the following description and drawings are appropriately simplified.

[0011] (Embodiment 1) Embodiment 1 will be described with reference to FIG. 1. FIG. 1 is a schematic cross-sectional view showing an example of an abrasive tool according to Embodiment 1.

[0012] Of course, the right-handed xyz coordinates shown in FIG. 1 and other drawings are for convenience in explaining the positional relationship of the components. Usually, the positive z-axis direction is vertically upward, the xy plane is a horizontal plane, and they are common among the drawings.

[0013] As shown in FIG. 1, the abrasive tool 10 includes a first clamping portion 1, a second clamping portion 2, a plurality of abrasive bodies 3, strings 4 and 5, and a capsule 6. The inner wall surface W1a of the pipe W1, which is an object to be polished, can be polished using the abrasive tool 10.

[0014] The first clamping portion 1 and the second clamping portion 2 clamp a plurality of abrasive bodies 3. The first clamping portion 1 and the second clamping portion 2 preferably have the size and mechanical strength necessary to clamp the abrasive bodies 3. The first clamping portion 1 and the second clamping portion 2 can take various shapes. An example of the first clamping portion 1 and the second clamping portion 2 shown in FIG. 1 is two plate-like bodies. The first clamping portion 1 preferably has a hole 1a through which the string 4 can pass. The second clamping portion 2 preferably has a hole 2a through which the string 5 can pass.

[0015] The plurality of abrasive bodies 3 are arranged between the first clamping portion 1 and the second clamping portion 2. The plurality of abrasive bodies 3 are clamped between the first clamping portion 1 and the second clamping portion 2. The plurality of abrasive bodies 3 preferably all have a size that allows them to pass through the pipe W1. Specifically, the diameter D3 of the plurality of abrasive bodies 3 is preferably smaller than the inner diameter D1 of the pipe W1. When the abrasive body 3 receives a predetermined compressive stress, it may deform so as to protrude in the direction perpendicular to the compressive stress. The abrasive body 3 is preferably made of a material having deformability. The abrasive body 3 is preferably made of a material having the mechanical strength and hardness necessary for polishing the object to be polished. Examples of such materials include elastic materials such as rubber. An abrasive may be added to such an elastic material. When the pipe W1 is made of a metal material, the abrasive body 3 is preferably made of an elastic material such as rubber.

[0016] The grinding body 3 has a hole 3a, and the hole 3a penetrates the grinding body 3. The hole 3a preferably has a cross-sectional area large enough for the strings 4 and 5 to pass through simultaneously. An example of the grinding body 3 shown in FIGS. 1 and 2 is three. The grinding body 3 can take various shapes. An example of the grinding body 3 shown in FIGS. 1 and 2 is spherical. The grinding bodies 3 shown in FIGS. 1 and 2 are arranged in a row between the first clamping portion 1 and the second clamping portion 2.

[0017] The total length of the string 4 is preferably longer than the length L1 of the tube W1. One end 4a of the string 4 is attached to the second clamping portion 2. The string 4 passes through the holes 3a of the plurality of grinding bodies 3. An example of the string 4 shown in FIGS. 1 and 2 passes through all the holes 3a of three spherical bodies, which is an example of the plurality of grinding bodies 3. The string 4 passes through the side surface of the capsule 6 or its vicinity between the plurality of grinding bodies 3. When the first clamping portion 1 has a hole 1a, the string 4 may pass through the hole 1a. The first clamping portion 1 is disposed between one end 4a and the other end 4b of the string 4. When the other end 4b of the string 4 is pulled away from the plurality of grinding bodies 3, one end 4a of the string 4 pulls the second clamping portion 2 toward the plurality of grinding bodies 3 side. Thereby, the second clamping portion 2 is brought closer to the first clamping portion 1 side.

[0018] The total length of the string 5 is preferably longer than the length L1 of the tube W1. One end 5a of the string 5 is attached to the first clamping portion 1. The string 5 passes through the holes 3a of the plurality of grinding bodies 3. An example of the string 5 shown in FIGS. 1 and 2 passes through all the holes 3a of three spherical bodies, which is an example of the plurality of grinding bodies 3. The string 5 passes through the side surface of the capsule 6 or its vicinity between the plurality of grinding bodies 3. When the second clamping portion 2 has a hole 2a, the string 5 may pass through the hole 2a. The second clamping portion 2 is disposed between one end 5a and the other end 5b of the string 5. When the other end 5b of the string 5 is pulled away from the plurality of grinding bodies 3, one end 5a of the string 5 pulls the first clamping portion 1 toward the plurality of grinding bodies 3 side. Thereby, the first clamping portion 1 is brought closer to the second clamping portion 2 side.

[0019] The strings 4 and 5 function as technical proximity means for bringing the first clamping portion 1 and the second clamping portion 2 closer.

[0020] The capsule 6 contains the abrasive 7. An example of the capsule 6 shown in FIG. 1 is a cylindrical body or a box-shaped body. The capsule 6 is disposed between a plurality of abrasive bodies 3. The capsule 6 may be disposed among all of the plurality of abrasive bodies 3. When the capsule 6 receives a predetermined compressive stress, the capsule 6 breaks and the abrasive 7 is released to the outside of the capsule 6. The abrasive 7 is preferably at least smaller than the abrasive body 3. The abrasive 7 is preferably a plurality of abrasive grains made of a material having mechanical strength and hardness necessary for polishing the object to be polished.

[0021] (Polishing method) Next, with reference to FIGS. 1 and 2, a polishing method for polishing the inner wall surface W1a of the tube W1 of the object to be polished using the polishing tool 10 will be described. FIG. 2 is a schematic cross-sectional view showing one step of the polishing method using the polishing tool 10 shown in FIG. 1.

[0022] As shown in FIG. 1, the polishing tool 10 is inserted into the tube W1, and the abrasive body 3 is disposed near the inner wall surface W1a of the tube W1 (step ST1). While extending the polishing tool 10 in the axial direction of the tube W1 (here, the X-axis direction), the polishing tool 10 may be inserted into the tube W1 while the abrasive body 3 is separated from the inner wall surface W1a of the tube W1. Specifically, while one of the strings 4 and 5 is disposed outside the tube W1, the polishing tool 10 is inserted into the tube W1. By flowing a fluid, the other of the strings 4 and 5 is passed through the downstream opening in the tube W1 and discharged to the outside of the tube W1. As the fluid, for example, water can be used.

[0023] Subsequently, as shown in FIG. 2, the first clamping portion 1 and the second clamping portion 2 are brought close to each other to deform the polishing body 3, thereby bringing the polishing body 3 into contact with the inner wall surface W1a of the pipe W1 (step ST2). Specifically, the other end 4b of the string 4 is pulled so as to be separated from the plurality of polishing bodies 3, and the other end 5b of the string 5 is pulled so as to be separated from the plurality of polishing bodies 3. By these actions, the first clamping portion 1 and the second clamping portion 2 are brought closer to each other. The first clamping portion 1 and the second clamping portion 2 apply a compressive stress to the plurality of polishing bodies 3, and the plurality of polishing bodies 3 press the capsule 6. Due to this pressing, the capsule 6 is broken, and the abrasive 7 is released outside the capsule 6. The portion where the capsule 6 is broken is preferably a portion facing the inner wall surface W1a of the pipe W1 in order for the abrasive 7 to move to the inner wall surface W1a of the pipe W1. The abrasive 7 moves from between the plurality of polishing bodies 3 to the inner wall surface W1a of the pipe W1. At least one of the polishing body 3 and the abrasive 7 comes into contact with the inner wall surface W1a of the pipe W1. Further, by moving the polishing tool 10 in the pipe W1, the inner wall surface W1a of the pipe W1 can be polished.

[0024] From the above, the abrasive 7 can be supplied between the plurality of polishing bodies 3. Therefore, it is possible to suppress the uneven distribution of the abrasive 7 in the pipe W1. As a result, the abrasive 7 can be uniformly distributed over the entire plurality of polishing bodies 3 in the pipe W1. Therefore, almost all regions of the inner wall surface W1a of the pipe W1 can be polished uniformly.

[0025] When the first clamping portion 1 and the second clamping portion 2 apply a compressive stress to the plurality of polishing bodies 3 and at least one of the plurality of polishing bodies 3 deforms so as to protrude in a direction perpendicular to the compressive stress, the diameter D3 of the polishing body 3 increases. When the abrasive 7 is disposed between the polishing body 3 and the inner wall surface W1a of the pipe W1, the abrasive 7 comes into contact with the inner wall surface W1a of the pipe W1. When the diameter D3 of the polishing body 3 increases until it becomes the same size as the inner diameter D1 of the pipe W1, the polishing body 3 comes into contact with the inner wall surface W1a of the pipe W1. Note that the other end 4b of the string 4 and the other end 5b of the string 5 may be further pulled to press the polishing body 3 and the abrasive 7 against the inner wall surface W1a of the pipe W1. Further, by moving the polishing tool 10 in the pipe W1, the inner wall surface W1a of the pipe W1 can be polished.

[0026] (Applicable Example) An example of the pipe W1 shown in FIGS. 1 and 2 extends linearly, but the pipe W1 may extend on a virtual curve in a three-dimensional space. The virtual curve may include a plurality of bent portions. The pipe W1 is, for example, a cooling circuit, an oil passage, or the like. A structure having a pipe W1 extending on a virtual curve in a three-dimensional space can be manufactured using metal additive manufacturing (AM: Additive Manufacturing). When a structure having a pipe W1 extending on a virtual curve in a three-dimensional space is manufactured using metal additive manufacturing, melt-down may occur and surface roughness may occur on the upper part of the pipe W1. The surface roughness causes stress concentration and is a cause of failure. When the surface roughness occurs on the upper part of the pipe W1, when the inner wall surface W1a of the pipe W1 is polished using the polishing tool 10 shown in FIGS. 1 and 2, the inner wall surface W1a can be smoothed and the surface roughness can be eliminated.

[0027] Note that the present invention is not limited to the above-described embodiments, and can be appropriately modified without departing from the gist thereof. Further, the present invention may be implemented by appropriately combining the above-described embodiments and examples thereof.

Explanation of Reference Numerals

[0028] 10 Polishing tool 1 First clamping portion 1a Hole 2 Second clamping portion 2a Hole 3 Polishing body 3a Hole 4, 5 Strings 4a, 5a One end 4b, 5b The other end 6 Capsule 7 Abrasive W1 Pipe W1a Inner wall surface D1 Inner diameter L1 Length

Claims

【Claim 1】 A polishing tool for polishing the inner wall surface of a pipe, comprising: a first clamping portion; a second clamping portion; a plurality of polishing bodies disposed between the first clamping portion and the second clamping portion and clamped between the first clamping portion and the second clamping portion; first and second strings for bringing the first and second clamping portions closer to each other; a capsule containing a polishing agent; and the capsule is disposed between the plurality of polishing bodies; one end of the first string is attached to the second clamping portion; the first clamping portion is disposed between one end and the other end of the first string; one end of the second string is attached to the first clamping portion; the second clamping portion is disposed between one end and the other end of the second string; when the other end of the first string and the other end of the second string are pulled so as to be separated from the plurality of polishing bodies, the first and second strings bring the first and second clamping portions closer to each other, the first and second clamping portions apply compressive stress to the plurality of polishing bodies, and when the plurality of polishing bodies press the capsule, the capsule cracks and the polishing agent is released outside the capsule; a polishing tool.

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