Metal grinding disk used in rotary tool

Abstract

To provide a metal circular grinding disk which has such durability as to be usable in a rotary tool, and has no clogging.SOLUTION: A circular grinding disk for being mounted on a rotary tool and rotated and used is composed of a body having thickness not exceeding 0.1 mm, and a large number of projections on the surface of the body, wherein the projections have heights not exceeding 0.3 mm.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a metal grinding disk for use by being attached to a rotary tool (air sander, electric sander, etc.). In particular, the present invention relates to a metal grinding disk that can rotate stably when in use and perform desired grinding.

Background Art

[0002] For operations such as chamfering, deburring, surface finishing of resin, wood, metal, gypsum board, etc., and in the case of metal, further operations such as rust removal and paint removal, usually, paper files or abrasive sheets coated with abrasives, metal files (Patent Document 1) are used, and many of the operations are manual, which is not efficient and has a narrow range of use. To grind efficiently, rotary tools (sanders, etc.) are known. A grinding disk is installed on the rotating part of the rotary tool, and grinding is performed by the rotation of the grinding disk.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The above paper files can be used for the grinding disk. Paper files are easily available and are also inexpensive. However, they are extremely prone to clogging and wear and have poor durability. The same applies to abrasive sheets.

[0005] Metal files are durable, but for use as a grinding disk, even if they are made into a circular shape, if they have a certain thickness, handling is inconvenient due to the overall weight. Furthermore, if the rotation center cannot be accurately set, due to the overall weight, stable rotation cannot be ensured, the operation becomes difficult, and the grinding efficiency may deteriorate.

[0006] When the thickness of the metal file is reduced to achieve weight reduction, distortion occurs throughout, so distortion correction is required. In addition, it is necessary to ensure the thickness for visibility, and there is a limit to reducing the thickness.

[0007] In addition, in order to ensure the required hardness, post-treatment such as quenching is required after profiling.

[0008] An object of the present invention is to provide a circular grinding disk made of metal that can be used for a rotary tool, has durability, and enables uniform grinding in order to solve the above problems.

[0009] An object of the present invention is to provide a circular grinding disk made of metal that is easy to handle and can ensure stable rotation by reducing the thickness. Furthermore, an object of the present invention is to provide a circular grinding disk made of metal that is easy to handle and can ensure stable rotation by reducing the thickness. Furthermore, an object of the present invention is to provide a circular grinding disk made of metal composed of a metal having a predetermined hardness.

Means for Solving the Problems

[0010] The grinding disk of the present invention is a circular grinding disk for attachment to a rotary tool and rotation for use, and is composed of a main body having a thickness not exceeding 0.1 mm and a large number of protrusions on the surface of the main body, and the protrusions have a height not exceeding 0.3 mm. Those having a disk diameter in the range of 25 to 180 mm can be used. The average density of the protrusions is preferably in the range of 2 to 400 pieces / cm 2 of the range.

[0011] The protrusions of the present grinding disk are preferably randomly located on the surface of the main body. The protrusions are areas that are not etched, and the areas other than the protrusions are etched areas. The grinding disk may be made of a metal with hardness or may be an SK85 quenched material.

Advantages of the Invention

[0012] According to the present invention, since the circular grinding disk is very thin, it is easy to handle, and there is almost no vibration even when it is attached to a rotary tool and rotated. Therefore, stable rotation is ensured, and efficient grinding is thereby made possible. Since the positions of the protrusions on the circular grinding disk are random, uniform grinding can be achieved.

[0013] When the circular grinding disk is manufactured by etching, the protrusions of the grinding disk are areas that are not etched. The protrusions are cylindrical in shape, and the edges at the tips contribute to grinding. The metal constituting the circular grinding disk may be one that can be etched, and a metal with hardness can be used.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0015] The various features of the present invention will now be described with reference to the drawings (photographs), together with preferred embodiments that are not intended to limit the present invention. The drawings are simplified and generalized for the purpose of explanation, and the scales do not necessarily match.

[0016] The rotary tool to which the grinding disk of the present invention is attached and which performs grinding can be an air sander, an electric sander, etc., and a commercially available rotary tool can be used (see FIGS. 1 and 2).

[0017] In FIGS. 1 and 2, the attachment of the grinding disk of the present invention to the rotary tool is performed by engaging a surface fastener fixed to the rotary tool with a tricot fabric attached to the back surface of the grinding disk. The grinding disk generally has a circular shape as shown in FIG. 3. This disk is made of carbon steel and is commonly used for metal files. Carbon steel can be hardened by heat treatment.

[0018] The grinding disk has a diameter of 25 to 180 mm and is composed of a circular body having a thickness not exceeding 0.1 mm and a large number of protrusions on the surface of the body. It is desirable that the height of the protrusions does not exceed 0.3 mm. Its average density is preferably in the range of 2 to 400 pieces / cm 2 . The diameter, height, and density of the protrusions of the grinding disk are appropriately selected according to the object to be ground. The positions of the protrusions are preferably randomly located on the substrate. By configuring it in this way, when the grinding disk rotates and contacts the object to be ground, the entire surface of the grinding disk can be used for grinding without bias.

[0019] As shown in FIG. 4, the protrusions formed as a result of etching as described below are columnar, and the edges of the tip portions contribute to grinding.

[0020] The formation of the grinding disk by etching will be described. This etching is basically the same as the conventional wet etching used in various fields, and its outline will be described. (1) Creation of the original plate (drawing of the pattern) Create a master plate based on the pattern diagram. Holes corresponding to the protrusions shown in FIG. 4 are made in the master plate. The positions of the holes are set randomly. (2) Pretreatment (cleaning (surface leveling, degreasing)) Perform surface pretreatment such as degreasing and neutralization treatment on the surface of the circular metal plate serving as the base material. The pretreatment is carried out to improve the adhesion of the next resist protective film. (3) Resist Apply a resist protective film (photosensitive material) on the pretreated metal plate. (4) Exposure Place the master plate on the resist protective film and expose it. Thereby, transfer the pattern to the resist protective film (photosensitive material). (5) Development and hardening Remove the unexposed parts (parts other than the parts corresponding to the holes) to expose the metal parts (the parts that are not removed (resist protective film) remain as a hardened film). (6) Etching (wet etching) Dissolve the exposed metal parts with an etching machine that controls the etching solution by an automatic control unit. By this etching, the thickness of the main body part is made about 0.1 mm, and the height of the protrusions that remain without being etched is made about 0.3 mm. (7) Stripping After removing (stripping) the remaining hardened film, wash it.

[0021] In the grinding disk manufactured by the above-described etching, the main body itself has a predetermined thickness by etching, while the protrusions are the parts that remain without being etched.

[0022] The metal constituting the grinding disk is made of carbon steel, which is generally used for metal files, and carbon steel can be hardened by heat treatment. This grinding disk aims to reduce weight by making the thickness thinner, but it is important that the circular grinding disk has little distortion even when made thinner.

[0023] The optimal metal is the SK85 hardened material. Since this material has a hardness of 500 Hv, hardening in post-treatment can be made unnecessary. Furthermore, even when the thickness of the main body is processed to 0.1 mm by etching, there is no distortion.

[0024] When the present grinding disk, which uses the SK85 hardened material and is etched so that the thickness is 0.1 mm and the height of the protrusions is 0.3 mm, and a circular metal file with a thickness of 1 mm manufactured by a conventional method for manufacturing metal files are rotated using a rotary tool, the lateral displacement and vertical movement with respect to the rotation plane of the rotation axis were measured. The measurement was performed by fixing a rotary rule (mp) with the grinding disk attached below with a vise and attaching a smartphone to the handle part of the rotary rule. A measurement application "Vibroscope Lite" (manufactured by TOON, LCC) is installed in the smartphone. The rotary tool was idled (that is, only rotated without grinding), and the vibration of the handle part was measured.

[0025] The upper diagrams in FIGS. 5 and 6 show the displacement situation of the rotation axis in the grinding disk surface (X-Z plane), and the lower diagrams show the variation of the vertical movement in the direction perpendicular to the grinding disk surface. FIG. 5 shows the result of the present grinding disk, and FIG. 6 shows the result of a circular metal file manufactured by a conventional method for manufacturing metal files (roughening).

[0026] As shown in the figure, in the present grinding disk, the rotation axis hardly moves, and the vertical movement is almost non-existent. In the present grinding disk, the thickness is as thin as 0.1 mm, and furthermore, the protrusions have a height of 0.3 mm. Although the position is random, it has no influence on the deviation in the X-Z plane or the vertical movement in the Y direction.

[0027] On the other hand, in the case of a circular conventional metal file with a thickness of 1 mm, there is a large deviation in the Z direction in the X-Z plane, and furthermore, the vertical movement is also intense. Since the metal file is roughened, there is a limit to making it thin, and it is considered that there is an influence in the direction of the teeth of the file.

[0028] As is clear from the comparison between Fig. 5 and Fig. 6, the present grinding disk is stable in the grinding operation. Further, since the present grinding disk is made of metal, it has durability, and because its thickness is about 0.1 mm and is thin, it is easy to handle.

[0029] The metal of the grinding disk may or may not have hardness as long as it can be etched. In the case of a metal that originally has a predetermined hardness, heat treatment is not required as a post-treatment.

[0030] It is known to those skilled in the art that many various modifications can be made without departing from the spirit and scope of the present invention. Therefore, it goes without saying that the embodiments of the present invention are merely illustrative and do not limit the scope of the present invention.

Claims

1. A circular grinding disk for attachment to a rotary tool and used by rotation, comprising: a body having a thickness not exceeding 0.1 mm; a plurality of protrusions on the surface of the body; and is composed of the protrusions having a height not exceeding 0.3 mm; A grinding disk characterized by the above.

2. The diameter of the grinding disk is in the range of 25 to 180 mm, The density of the protrusions is in the range of 2 to 400 pieces / cm2, The grinding disk according to Claim 1 The average density of the protrusions is

3. The protrusions are randomly located on the disk surface. The grinding disk according to Claim 1.

4. The protrusions are areas that are not etched, The areas other than the protrusions are etched areas. The grinding disk according to Claim 1.

5. The grinding disk according to Claim 1, made of a metal with hardness.

6. The grinding disk according to Claim 1, made of SK85 hardened material.

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