Hole making device and hole making method

Abstract

To provide a hole making device which can easily make a hole in a direction perpendicular to a processed object even when a hole making tool, such as a hole saw, is used, and to provide a hole making method.SOLUTION: A hole making device includes a hole making tool and a center core member. The hole making tool includes an internal space in which blade parts are disposed on one circumference and which is recessed to the side of a rotary tool attachment part. The center core member includes: a center core bottom part held by a processed object; a center core side part which contacts with an inner wall of a wall surface of the hole making tool which forms the internal space of the hole making tool; and center core holding means which holds the center core member and the processed object. The center core side part and the processed object are installed perpendicularly.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an apparatus and method for drilling a through hole in a workpiece using a tool. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a drilling tool called a hole saw is known for drilling through holes in a workpiece.

[0003] The hole saw (hole drilling tool) disclosed in Patent Document 1 includes a drill (Drill 3 in Patent Document 1) that is arranged coaxially with the axis of rotation of a rotary tool such as an electric drill. When drilling a through hole in a workpiece, first the drill comes into contact with the workpiece to drill a hole, and then the hole saw is pressed against the workpiece to bring the blade part attached to the cylinder into contact with the workpiece, and a through hole of the desired size is drilled. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-21688 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the hole saw with a drill attached to a rotating shaft described in Patent Document 1, the center of the hole is continuously held by the thickness of the workpiece and the small contact area of ​​the side of the drill, making it difficult to keep the blade perpendicular to the workpiece, and the hole saw may strike the workpiece at an angle, resulting in a distorted through hole. This possibility is particularly high for power tools that are held by a person.

[0006] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a drilling device and a drilling method that can easily drill holes perpendicular to a workpiece, even when using a drilling tool such as a hole saw. [Means for solving the problem]

[0007] The present invention was completed based on the discovery that by providing a drilling tool device with a center core member that holds the center of the hole in the internal space of the drilling tool, it is possible to create a drilling device and drilling method that makes it easy to drill a hole perpendicular to the workpiece.

[0008] In order to solve the above problems, the drilling device of the present invention is a drilling device comprising a drilling tool and a center core member, wherein the drilling tool has blades arranged on a single circumference and an internal space recessed toward the side of the rotating tool mounting portion, and the center core member comprises a center core bottom held by the workpiece, a center core side portion contacting the inner wall of the wall surface of the drilling tool which constitutes the internal space of the drilling tool, and a center core holding means for holding the center core member and the workpiece, and is characterized in that the center core side portion and the workpiece are installed vertically.

[0009] According to the present invention, the center core member is held on the workpiece by the center core holding means while the hole is drilled, which makes it easier to maintain the center of rotation of the drilling tool and the center of the hole in the workpiece so that they do not shift, and makes it easier to drill a through hole perpendicular to the workpiece. Furthermore, since the center core member is held on the workpiece by the center core holding member, the punch core and the center core member can be disposed of as is after the hole is drilled.

[0010] The center core member of the present invention, which solves the above problems, comprises a center core bottom portion that is held by the workpiece, a center core side portion that contacts the inner wall that forms the internal space of the drilling tool, and a center core holding means that holds the center core member and the workpiece, and is characterized in that the center core side portion and the workpiece are installed vertically.

[0011] According to the present invention, since the center core member is held on the workpiece by the center core holding means, it is easy to maintain the center of rotation of the drilling tool and the center of the hole in the workpiece so that they do not shift, which has the effect of making it easy to drill a through hole perpendicular to the workpiece. Furthermore, since the center core member is held on the workpiece by the center core holding member, the punch core and the center core member can be disposed of as is after the hole is drilled.

[0012] The drilling method of the present invention for solving the above problems is characterized by comprising: a center core fixing process in which a center core member is held on a workpiece by a center core holding means; a pre-drilling preparation process in which the center core member is accommodated in the internal space of a drilling tool so that the side portion of the center core is in contact with the inner wall that constitutes the internal space of the drilling tool; and a drilling process in which the drilling tool is rotated by a rotating tool connected to a rotating tool mounting portion, thereby causing the side portion of the center core to rub against the inner wall that constitutes the internal space of the drilling tool, and a through hole is drilled vertically in the workpiece.

[0013] According to the present invention, since the center core member is held on the workpiece by the center core holding means, it is easy to maintain the center of rotation of the drilling tool and the center of the hole in the workpiece so that they do not shift, which has the effect of making it possible to provide a drilling method that makes it easy to drill a through hole perpendicular to the workpiece.

[0014] The drilling device of the present invention, which solves the above-mentioned problems, is a drilling device comprising a drilling tool and a center core member, wherein the drilling tool has a plurality of blades arranged on a single circumference and an internal space recessed toward the side of the rotating tool mounting portion, and the plurality of blades are each arranged at positions on an imaginary line passing through the center of the single circumference, and the center core member comprises a center core bottom portion held by the workpiece, a center core side portion contacting the inner wall of the wall surface of the drilling tool which constitutes the internal space of the drilling tool, and a center core holding means for holding the center core member and the workpiece, and is characterized in that the workpiece is evenly cut away by the plurality of blades to form a through hole in the workpiece.

[0015] According to the present invention, the hole is drilled while the center core member is held on the workpiece by the center core holding means, which makes it easier to maintain the center of rotation of the drilling tool and the center of the hole in the workpiece so that they do not shift, and since the workpiece is evenly cut away by multiple blades, it is easy to drill a through hole by punching the workpiece. Furthermore, since the center core member is held and fixed to the workpiece by the center core holding member, the punch core and the center core member can be disposed of as is after the hole is drilled.

[0016] The drilling method of the present invention for solving the above problems is characterized by comprising: a center core fixing process in which a center core member is held on a workpiece by a center core holding means; a pre-drilling preparation process in which the center core member is accommodated in the internal space of a drilling tool so that the side portion of the center core is in contact with the inner wall that constitutes the internal space of the drilling tool; and a drilling process in which the drilling tool is rotated by a rotating tool connected to a rotating tool mounting part, causing the side portion of the center core to rub against the inner wall that constitutes the internal space of the drilling tool, and the workpiece is evenly cut away by a plurality of blades arranged on a virtual line passing through the center of the rotating tool to form a through hole in the workpiece.

[0017] According to the present invention, since the center core member is held on the workpiece by the center core holding means, it is easy to maintain the center of rotation of the drilling tool and the center of the hole in the workpiece so that they do not shift, and the workpiece is evenly cut away by multiple blades arranged on an imaginary line passing through the center of the rotating tool, thereby providing an advantageous effect of a drilling method in which a through hole is formed in the workpiece as if punching it out.

[0018] In order to solve the above problems, the drilling device of the present invention is a drilling device comprising a drilling tool and a center core member, wherein the drilling tool comprises a drill member, blades arranged on a single circumference, and an internal space recessed toward the side of the rotary tool mounting portion, and the center core member comprises a center core bottom held by the workpiece, a drill member installation portion into which the tip of the drill member is inserted and where the side of the drill member comes into contact with the inner wall of the through hole, and a center core holding means for holding the center core member and the workpiece, and is characterized in that the center core side and the workpiece are installed vertically.

[0019] According to the present invention, the side surface of the drill member (the side portion of the drill member) and the inner wall of the through hole slide circumferentially and toward the workpiece (downward), so that a pilot hole can be drilled into the workpiece using the drill member and a through hole using the cutting portion while preventing the rotation axis from shifting. Furthermore, since the center core member is held on the workpiece by the center core holding member, the punch core and the center core member can be disposed of as is after the hole is drilled. Effect of the Invention

[0020] The present invention provides a drilling tool device that has a center core member that holds the center of the hole in the internal space of the drilling tool, making it possible to provide a drilling device and drilling method that makes it easy to drill a hole perpendicular to the workpiece. [Brief description of the drawings]

[0021] [Figure 1] 1 is a schematic diagram showing a drilling device according to a first embodiment of the present invention. [Diagram 2] Fig. 1A is a schematic diagram showing a state in which the drilling tool according to the first embodiment of the present invention is viewed from the side, and Fig. 1B is a schematic diagram showing a state in which the drilling tool according to the first embodiment of the present invention is viewed from the bottom (blade portion). [Diagram 3] 1 is a schematic diagram showing a method of using a hole drilling device according to a first embodiment of the present invention. [Figure 4] FIG. 4 is a schematic diagram showing a drilling device according to a second embodiment of the present invention. [Diagram 5] 5 is a schematic diagram showing a drilling tool of a drilling apparatus according to a second embodiment of the present invention; FIG. [Figure 6] FIG. 4 is a schematic diagram showing a drilling device according to a third embodiment of the present invention. [Figure 7] FIG. 11 is a schematic diagram showing a drilling device according to a fourth embodiment of the present invention. [Figure 8] FIG. 11 is a schematic diagram showing a method of using the hole drilling device according to the fourth embodiment of the present invention. [Figure 9] 1 is a schematic plan view of a center core member applicable to the drilling apparatus according to the first, second and fourth embodiments of the present invention; [Figure 10] 4 is a schematic plan view of a center core member applicable to the hole drilling device according to the second and third embodiments of the present invention. FIG. [Figure 11] 1 is a schematic diagram showing a case where a hole drilling device according to a second embodiment of the present invention is used to process a curved surface of a workpiece. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, the embodiments of the drilling device and the drilling method according to the present invention will be described in detail with reference to the drawings. Note that the drilling device and the drilling method described in the embodiments are merely exemplified to explain the drilling device and the drilling method according to the present invention, and are not limited thereto. It should be noted that the method of using the hole drilling device described in the present invention should be read as a hole drilling method.

[0023] [First embodiment] A hole drilling apparatus and a hole drilling method according to a first embodiment of the present invention will be described with reference to FIG. The hole drilling device 101 of this embodiment drills holes in a workpiece 3, and includes a drilling tool 1 and a center core member 2. A through hole 5 is a hole that is drilled when the hole drilling device 101 is used on the workpiece 3, and the two-dot chain line indicates the diameter of the through hole 5.

[0024] [Hole drilling tools] The drilling tool 1 is connected to a rotary tool such as a drill body (not shown) and drills a through hole in a workpiece 3 to be processed. Specifically, a tool called a hole saw can be exemplified, as can a tool called an adjustable drill, a free drill, or a circle cutter. The material of the drilling tool 1 is not particularly limited as long as it can drill a through hole in the workpiece 3. In this embodiment, a hole saw will be used for explanation. The drilling tool 1 includes a rotating tool attachment portion 11, a cylindrical portion 12, and a blade portion 13. The drilling tool 1 includes an internal space 14 in which the blade portion 13 is arranged on a circle centered on the rotation axis and is recessed toward the rotating tool attachment portion 11.

[0025] <Rotary tool attachment part> The rotating tool attachment part 11 is a part that is connected to a rotating tool (not shown). By connecting the rotating tool attachment part 11 to the rotating tool, when the rotating tool is rotated by a human operation, the drilling tool 1 rotates. The connection between the rotating tool attachment part 11 and the rotating tool is not particularly limited as long as the connection structure and connection method can transmit the rotation of the rotating tool to the drilling tool 1 and provide a rotational force that enables the drilling tool 1 to drill a through hole in the workpiece 3. The central axis of the rotating tool attachment part 11 is coaxial with the rotation axis of the rotating tool.

[0026] <Cylindrical part> The cylindrical portion 12 has a blade portion 13 provided on the side of the workpiece 3 (the lower side in FIG. 1), and a rotary tool attachment portion 11 provided on the side opposite the blade portion 13 (the upper side in FIG. 1). The center of the cylindrical portion 12 is coaxial with the center of rotation of the rotary tool and the center of the rotary tool attachment portion 11 . The cylindrical portion 12 has a top portion 121 on which the rotary tool attachment portion 11 is provided, and a wall portion 122 extending from the top portion 121 toward the workpiece 3 . The top portion 121 is a member that extends in a direction intersecting the center of rotation, and is a member for supporting the rotating tool attachment portion 11 and the wall portion 122. The wall portion 122 is a member extending in a cylindrical shape from the top portion 121 toward the workpiece 3 so that the blade portions 13 are arranged on one circumference centered on the rotation axis. The wall portion 122 and the top portion 121 form an internal space 14.

[0027] <<Inner Space>> The internal space 14 is a cylindrical space that is open toward the workpiece 3 and is surrounded by a ceiling portion 121 and a wall portion 122. The center of the internal space 14 is coaxial with the center of the cylindrical portion 12. The internal space 14 is a space in which the center core member 2 described later is accommodated, and the inner wall 123 of the wall portion 122 that forms the internal space 14 comes into contact with the center core side portion 22 of the center core member 2, and the drilling tool 1 is rotated while sliding circumferentially, thereby preventing the rotating shaft from sliding when drilling. The axial size (depth, vertical direction) of the internal space 14 is greater than or equal to the sum of the axial size (depth, vertical direction) that can accommodate the center core member 2 and the thickness of the workpiece 3, so that a through hole 5 can be drilled in the workpiece 3.

[0028] <Blade> The blade portion 13 is located at the tip of the wall portion 122 of the cylindrical portion 12 on the side of the workpiece 3, and rotates while in contact with the workpiece 3, thereby cutting the workpiece 3 and opening a through hole 5. The blade portion 13 is not particularly limited as long as it has a shape and material that can cut the workpiece 3 and open the through hole 5, and blades of conventional shapes and materials can be used.

[0029] The blade portion 13 can be applied so long as it has at least one (single) blade 131 provided on one circumference centered on the rotation axis, but when it is composed of multiple blades 131 as shown in Fig. 2, it is preferable that the blades 131A and 131B are arranged on an imaginary line passing through the center of rotation when the drilling tool 1 is viewed from the direction of the blade portion 13 (the downward direction, in other words, the direction of the workpiece 3). When the drilling tool 1 is rotated by the rotating tool, the blades 131A and 131B come into contact with the workpiece 3 and evenly cut away the workpiece 3 at the position of the imaginary line, thereby creating a punching core 4 so as to punch out the workpiece 3, and providing a through hole 5, as shown in Fig. 3(D).

[0030] [Center core member] The center core member 2 is accommodated in the internal space 14 of the drilling tool 1, and a part of it slides against the inner wall 123 that forms the internal space 14 during drilling, thereby serving to hold the rotation axis of the drilling tool 1 in place so that it does not easily shift. The material of the center core member 2 is not particularly limited, but a material softer than the drilling tool 1 is preferable from the viewpoint of preventing damage to the drilling tool 1. Specifically, a resin is preferable as the material. The center core member 2 includes a center core bottom portion 21, a center core side portion 22, and a center core holding means .

[0031] <Center core bottom> The center core bottom 21 is held on the workpiece 3 by a center core holding means 23 described later, and has a contact area that can hold the center core bottom 21 so as not to move due to the rotational force when the drilling tool 1 is rotated by a rotating tool. A specific example of the shape of the center core bottom 21 is a disk shape.

[0032] <Center core side> The center core side portion 22 comes into contact with the inner wall 123 of the drilling tool 1, thereby preventing the rotation axis of the drilling tool 1 from shifting during drilling. The center core side portion 22 is designed to be tall so as to increase the contact area with the inner wall 123 , and comes into contact with the inner wall 123 that constitutes the internal space 14 of the drilling tool 1 .

[0033] <Center core holding means> The center core holding means 23 is a means for holding the center core bottom portion 21 so as not to move due to the rotational force when the drilling tool 1 is rotated by a rotating tool. The center core holding means 23 is not particularly limited as long as it is a means capable of holding the center of rotation without moving with the rotation of the drilling tool 1 during drilling, and specific examples include holding with double-sided tape or holding with a suction cup. The center core bottom 22 may be made of metal and fixed by arranging a magnet on the back side of the workpiece 3. The center core bottom 22 may be made of a magnet, and a metal or magnet may be arranged on the back side of the workpiece 3 as a fixing means, and if the workpiece 3 is metal, it may be held by the magnet of the center core bottom 22.

[0034] <Item to be processed> The workpiece 3 applicable to the present invention is not particularly limited as long as a hole can be drilled with the drilling tool 1 and the center core member 2 can be held by the center core holding member 23. Specific examples include wood, metal, concrete, stone, resins such as polyvinyl chloride and acrylic, glass, tiles, etc. Among these, stone, acrylic resin, glass, tiles, etc., which are hard and brittle, are preferred.

[0035] A conventional drilling tool called a hole saw has a drill member (drill 3 in Patent Document 1) on a rotating shaft, and after a hole is drilled in the workpiece 3 with the drill member, a blade portion provided on a cylindrical body comes into contact with the workpiece 3 to drill a through hole larger than the hole drilled by the drill portion. However, even when the hole saw is rotated by a rotating tool, the center of rotation of the drill member does not rotate, and when the drill member is pressed against the workpiece 3, the center portion of the drill member that is not rotating applies a force perpendicularly to the workpiece 3. Therefore, the workpiece 3 cannot be cut off at the center of rotation, and this point becomes the trigger for a large crack to occur in the workpiece 3. Therefore, the present invention provides a hole drilling device 101 that has a structure that does not have a drill member in the drilling tool 1 and uses a center core member 2, which makes it easier to maintain the center of rotation (axis of rotation) and drill a through hole vertically, thereby preventing the workpiece 3 from cracking, particularly when drilling through holes in materials that are hard and brittle, such as stone, acrylic resin panels, plate-shaped glass, and tiles. It should be noted that the hole drilling device 101 of the present invention does not exclude application to processing objects such as wood and metal.

[0036] [How to use the hole punching device] A method of using the hole drilling device of the present invention will be described with reference to FIG. First, as shown in FIG. 3(A), the center core member 2 is held on the object 3 to be processed by using the center core holding means 23 for the center core member 2. This step is referred to as a center core fixing step in which the center core member 2 is held on the workpiece 3 by the center core holding means 23.

[0037] 3(B), with the rotating tool attachment part 11 of the drilling tool 1 and a rotating tool (not shown) connected together, the center core member 2 is accommodated in the internal space 14 of the drilling tool 1, so that the cutting edge 13 comes into contact with the surface of the workpiece 3. At this time, the inner wall 123 of the drilling tool 1 and the center core side part 22 come into contact with each other. In addition, the center core member 2 may be housed in the internal space 2 when the drilling tool 1 is not rotated by a rotating tool, or the center core member 2 may be housed in the internal space 2 when the drilling tool 1 is rotated by a rotating tool. This process is a pre-drilling preparation process in which the center core member 2 is accommodated in the internal space 14 of the drilling tool 1 and the center core side portion 22 is in contact with the inner wall 123 that constitutes the internal space 14 of the drilling tool 1.

[0038] 3(C), with the center core member 2 housed in the internal space 14 of the drilling tool 1, a rotating tool (not shown) is operated by a person to move the drilling tool 1 downward, causing the drilling tool 1 to rotate and bringing the blade portion 13 of the drilling tool 1 into contact with the workpiece 3. After that, the drilling tool 1 is further moved downward, causing the blade portion 13 to move beyond the thickness of the workpiece 3 while scraping away the workpiece 3, and a through hole 5 is formed. At this time, the center core side portion 22 and the inner wall 123 slide in the circumferential direction (the rotation direction of the drilling tool 1) and toward the workpiece 3, so that the hole is drilled while the rotation axis of the drilling tool 1 is held in place so as not to shift. This process is called a drilling process in which the drilling tool 1 is rotated by a rotating tool connected to the rotating tool mounting portion 11, causing the center core side portion 22 to rub against the inner wall 123 that forms the internal space 14 of the drilling tool 1, and a through hole 5 is drilled vertically in the workpiece 3.

[0039] In addition, the drilling process can also be described as follows: the drilling tool 1 is rotated by a rotating tool connected to the rotating tool mounting portion 11, causing the center core side portion 22 to rub against the inner wall 123 that forms the internal space 14 of the drilling tool 1, and the workpiece 3 is evenly scraped away by multiple blades 131A and 131B arranged on a virtual line passing through the center of the rotating tool 1, forming a through hole in the workpiece 3.

[0040] By carrying out the above steps, holes are drilled in the workpiece 3 using the drilling device 101. As shown in Figure 3(D), after the drilling process, a through hole 5 is provided in the workpiece 3, and the punching core 4 holding the center core member 2 may be discarded as is, or the center core member 2 may be removed and reused.

[0041] [Second embodiment] A hole drilling device 102 according to a second embodiment of the present invention will be described with reference to Fig. 4. The same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted. The hole drilling device 102 according to the second embodiment differs in that it further includes an inner wall 123B of the hole drilling tool 1B that slides in the circumferential direction with the center core member 2B, and a center core side surface 22B of the center core member 2B.

[0042] [Drilling tools] The drilling tool 1B includes an upper wall 122B protruding from the top 121 toward the rotary tool attachment 11 in addition to the components of the drilling tool 1 of the first embodiment. The upper wall 122B is provided so as to surround a space 141, and the space 141 is connected to a space 142 surrounded by the top 121 and the wall 122. The internal space 14 includes both the space 141 and the space 142. The space 141 surrounded by the upper wall 122B has a smaller diameter than the space 142 surrounded by the top 121 and the wall 122. This space 141 can be said to be in a state in which the stopper member 93 (screw) of the stopper hole 92 is loosened from a conventional hole saw and the drill member (the drill 3 in Patent Document 1) is removed, as shown in FIG. 5.

[0043] [Center core material] As shown in Figure 4, in addition to the center core member 2 of the first embodiment, the center core member 2B is provided with a protrusion 24 that protrudes toward the rotating tool mounting portion 11 so as to be coaxial with the center of the center core bottom 21 (coaxial with the rotation axis of the drilling tool 1B).

[0044] <Protrusion> The protrusion 24 is housed in a space 141 surrounded by an upper wall 122B of the drilling tool 1B, and when the drilling tool 1B is rotated by a rotating tool, the inner wall 123B of the upper wall 122B and the outer circumferential surface of the protrusion 24 slide in the circumferential direction, thereby holding the rotation axis of the drilling tool 1B from shifting. The outer circumferential surface of the protrusion 24 corresponds to the center core side portion 22B. The height of the protrusion 24 in the rotation axis direction (upward) is set to be smaller than the height (depth) of the space 141 surrounded by the upper wall portion 122B. Moreover, it is preferable that the height of the protrusion 24 is made greater than the thickness (height) of the center core bottom portion 21, in order to increase the contact area with the drilling tool 1B in the height direction. The center core member 2B is housed in the internal space 14 (space 141 and space 142) of the drilling tool 1B.

[0045] [How to use the hole punching device] The method of using the hole drilling device 102 of this embodiment is similar to that of the hole drilling device 101 of the first embodiment, so a description of the method of using the hole drilling device 102 will be omitted. Note that the drilling tool 1 and center core member 2 in the method of using the first embodiment are replaced with the drilling tool 1B and center core member 2B and are applied to the hole drilling device 102. In addition, in the drilling processing device 102 of this embodiment, the center core side portion 22 of the center core bottom 21 and the inner wall 123 of the wall portion 122 slide circumferentially, and the center core side portion 22B of the protrusion portion 24 and the inner wall 123B of the upper wall portion 122B slide circumferentially, so that there is an effect of better suppressing misalignment of the rotation axis of the drilling tool 1B than in the first embodiment. In addition, the punched core 4 after processing can be easily picked up and thrown away by a person by the protruding portion 24, which has the effect of providing excellent convenience.

[0046] [Third embodiment] A hole punching device 103 according to a third embodiment of the present invention will be described with reference to Fig. 6. The same components as those in the second embodiment are denoted by the same reference numerals, and the description thereof will be omitted. In the hole punching device 103 according to the third embodiment, the center core bottom portion 21C of the center core member 2C is different from that in the second embodiment and does not include the center core side portion 22.

[0047] <Center core bottom> A center core bottom portion 21C of a center core member 2C is provided with a smaller diameter, unlike the center core bottom surface 21 of the second embodiment. In this embodiment, an inner wall 123 of a wall portion 122 of the drilling tool 1B is not in contact with the center core member 2C (the side surface of the center core bottom portion 21C), leaving a gap 6 therebetween. The rotation shaft of the drilling tool 1B is held in place so as not to shift as the center core side portion 22B of the projection 24 comes into contact with the inner wall 123B of the upper wall portion 122B and slides in the circumferential direction.

[0048] [How to use the hole punching device] The method of using the hole punching device 103 of this embodiment is similar to that of the hole punching device 102 of the second embodiment, so the explanation of the method of using the hole punching device 103 will be omitted. Note that the center core member 2B in the method of using the second embodiment is replaced with the center core member 2C and applied to the hole punching device 103. In addition, in the drilling processing device 103 of this embodiment, the center core member 2C and the inner wall 123 of the wall portion 122 are not in contact with each other, so there is no circumferential sliding movement, and the center core side portion 22B of the protrusion portion 24 and the inner wall 123B of the upper wall portion 122B slide in the circumferential direction. In this embodiment, the inner wall 123 of the wall portion 122 of the drilling tool 1B is not in contact with the center core member 2C (the side of the center core bottom portion 21C) and is in a gaped state, so that the cutting chips cut off by the blade portion 13 can enter the gap 6, which has the effect of reducing the risk of the cutting chips coming into contact and rubbing against the blade portion 13 of the drilling tool 1C, which could damage the blade portion 13.

[0049] [Fourth embodiment] A hole drilling device 104 according to a fourth embodiment of the present invention will be described with reference to FIG. 7. The same components as those in the first embodiment are given the same reference numerals and will not be described. In the hole drilling device 104 according to the fourth embodiment, a drill member 15 is provided in a hole drilling tool 1D. In other words, the hole drilling tool 1D is a hole drilling tool (such as a hole saw or a drill bit) that includes a conventional drill member. Also, the center core 2D differs from the center core member 2 according to the first embodiment in that it includes a drill member installation portion 25.

[0050] <Drill part installation section> The drill member installation portion 25 of the center core member 2D is inserted with the tip of the drill member 15 and is provided at the center of the center core member 2D (the rotation center of the drilling tool 1D, the portion where the drill member 15 abuts). The drill member installation portion 25 is a straight through hole coaxial with the axis of the drill member 15, and has a diameter such that when the drill member 15 is inserted and the drilling tool 1D is rotated by a rotary tool, the side surface of the drill member 15 (drill member side portion 151) comes into contact with and slides against the through hole inner wall 251. Because the side surface of the drill member 15 (drill member side portion 151) and the through hole inner wall 251 slide in the circumferential direction and toward the workpiece 3 (downward), the pilot hole 51 by the drill member 15 and the through hole 5 by the cutting edge portion 13 can be drilled in the workpiece 3 while preventing the rotation axis from shifting.

[0051] Furthermore, the center core holding part 24D in this embodiment may be the same as the center core holding means 23 in the first embodiment. However, it is preferable to use double-sided tape as the center core holding part 34D and arrange it so as to cover the entire periphery of the through hole of the drill member installation part 25 in an annular shape. By using double-sided tape on the center core holding portion 34D and installing it so as to surround the entire periphery of the through hole (drill installation portion 25), even if a point on the non-rotating axis of the drill member 15 presses and cracks the workpiece 3 when the drill member 15 hits the workpiece 3 to drill a hole, the double-sided tape on the center core holding portion 34D prevents the crack from expanding, and the crack can be kept smaller than the size of the through hole 5 opened by the blade portion 13, which is advantageous.

[0052] [How to use the hole punching device] A method of using the hole drilling device of the present invention will be described with reference to Fig. 8. Note that the explanation of the same steps as those in the method of using the hole drilling device 101 of the first embodiment will be omitted, and the hole drilling tool 1 and center core member 2 of the first embodiment will be replaced with the hole drilling tool 1D and center core member 2D.

[0053] First, similarly to the first embodiment, a center core fixing step is carried out. 8(A), the tip of the drill member 15 is inserted into the through-hole of the drill member installation portion 25. At this time, the side portion 151 of the drill member comes into contact with the inner wall 251 of the through-hole. This step is referred to as a drill member setting step in which the tip of the drill member 15 is inserted into the through hole of the drill member setting section 25 so that the drill member side portion 151 and the through hole inner wall 251 come into contact with each other.

[0054] 8(B), the drilling tool 1D is rotated by a rotating tool, and the drill member 15 drills a pilot hole 51 in the workpiece 3. At this time, the drill member side portion 15 is moved along the through-hole side wall 251 of the drill member installation portion 25 toward the workpiece 3, thereby preventing the rotation axis of the drilling tool 1D from shifting. This step is referred to as a pilot hole making step in which the drilling tool 1D is rotated by a rotating tool, and the drill member 15 makes the pilot hole 51 while contacting the workpiece 3 along the through hole of the drill member installation portion 25. In addition, as shown in Figure 8 (A), by bringing the center core side portion 22 and the inner wall 123 into contact before starting the pilot hole creation process, it is possible to further prevent the rotation axis of the drilling tool 1D from shifting.

[0055] Next, the drilling tool 1D is rotated and further moved in the direction of the workpiece 3, so that the center core 2D is accommodated in the internal space 14 and the center core side portion 22 and the inner wall 123 are in contact with each other, resulting in the same state as the pre-drilling preparation process in the first embodiment.

[0056] Thereafter, similarly to the first embodiment, a hole drilling process is performed, and a series of hole drilling steps is completed. 8(A) and (B) show an example in which the center core side portion 22 and the inner wall 123 are in contact with each other before the pilot hole making step is started, but as in the center core 21C of the third embodiment, the diameter of the center core bottom portion 21 may be made smaller than the internal space 14 to provide a gap 6 so that the center core side portion 22 and the inner wall 123 do not come into contact with each other. In this case, there is an effect of suppressing the risk that chips produced by the blade portion 13 cutting the workpiece 3 will enter the gap 6 and come into contact with and rub against the blade portion 13 of the drilling tool 1C, thereby damaging the blade portion 13.

[0057] In the first, second and fourth embodiments, the center core bottom 21 of the center core members 2, 2B and 2D is described as being disk-shaped. However, as shown in Figs. 9(A) and (B), the shape is not limited to a circular shape in plan view, and may be a polygon having a triangle, a rectangle, a pentagon, a hexagon or more. When the center core bottom 21 is polygonal, the apex of the polygon corresponds to the center core side portion 22 and contacts the inner wall 123. In addition, the space between the virtual circle (the center of which is the same as the rotation axis) and the side of the polygon corresponds to the space 6, and becomes a space into which cutting chips enter, which can suppress damage to the blade portion 13. It is also possible to apply a polygonal shape to the center core bottom 21C of the center core member 2C of the third embodiment.

[0058] Also, as shown in FIG. 10, in the second and third embodiments, the shape of the protrusion 24 of the center core portion 2B in plan view can be a circle or a polygon having more than one side, such as a triangle, a rectangle, a pentagon, or a hexagon, as shown in FIG. 10. When the protrusion 24 is polygonal in plan view, the apex of the polygon corresponds to the center core side portion 22B and contacts the inner wall 123B of the upper wall portion 122B. Note that, by applying the center core bottom portion 21 of the first and second embodiments, the center core bottom portion 21 or 21C may be polygonal in plan view, as shown in FIG. 10(B) and FIG. 10(D). Also, as shown in FIG. 10, the shape of the center core bottom portion 21 in plan view and the shape of the protrusion portion 24 in plan view may be either the same shape or different shapes. The same is true for the fourth embodiment, and the shape of the drill member installation part 25 in plan view, instead of the protrusion 24, can be a circle or a polygon having more than one side, such as a triangle, a rectangle, a pentagon, or a hexagon. The shape of the center core bottom 21 in plan view can be a circle or a polygon, and the shape of the drill member installation part 25 in plan view and the shape of the center core bottom 21 in plan view can be made different. When the drill member installation part 25 is polygonal, a gap is formed between the side surface (drill member side part 151) of the drill member 15 and the through-hole inner wall 251, and chips of the drill member 15 enter the gap, which has the effect of suppressing damage to the drill member 15 caused by the chips.

[0059] In the first to fourth embodiments of the present invention, the plate-shaped workpiece 3 has been described, but the workpiece 3 can also be applied to a convex or concave curved surface such as a pipe or a sphere. In that case, the bottom surface of the center core bottom 21 or 21C can be shaped to fit the curved surface (FIG. 11(A)), or the center core holding member 23 can be shaped to fit the curved surface (FIG. 11(B)), as shown in FIG. 11, thereby making it possible to apply the hole drilling devices 101 to 104 of the present invention to the curved surface. Furthermore, as shown in Figure 11(C), when the workpiece 3 is cylindrical (Figure 11(C) is a conceptual diagram of a cylindrical workpiece extending in a direction perpendicular to the paper surface), the center core bottom 21 may be a V-shaped groove, also called a V-block or a groove.

[0060] The hole drilling apparatuses 101-104 of the present invention accommodate the center core members 2, 2B, 2C, and 2D in the internal space 14 of the hole drilling tools 1, 1B, and 1D, and hold the rotation axes of the hole drilling tools 1, 1B, and 1D so as not to shift, and can be suitably used when drilling holes in the edge portion of the workpiece 3 or in the corner portion of a wall. In addition, since the center core members 2, 2B, 2C, and 2D are held in the punching core 4 by a center core holding member 23 such as double-sided tape, no traces of the double-sided tape are left on the workpiece 3 after processing, and post-processing after processing is easy, and the punching core 4 can be disposed of as is. [Industrial Applicability]

[0061] INDUSTRIAL APPLICABILITY The drilling device of the present invention can be used for processing objects made of various materials, and is particularly suitable for use when a drilling tool is connected to a rotary tool that is held by hand when used. [Explanation of symbols]

[0062] 101, 102, 103, 104 Drilling equipment 1 Drilling tools 11 Rotary tool attachment 12 Cylindrical part 121 Heaven 122 Wall 123 Interior wall 13 Blade 14 Interior Space 2 Center core member 21 Center core bottom 22 Center core side 23 Center core holding member 3. Processing Object 4. Core punch 5 Through hole 1B Drilling tools 122B Upper wall 123B Inner wall 2B Center core material 22B Center core side 24 Protrusion 2C Center core material 21C Center Core Bottom 6. Gap 1D Drilling Tool 15 Drilling parts 151 Drill member side 2D Center Core Member 25 Drill component installation section 251 Inner wall of through hole

Claims

1. A hole drilling device comprising a hole drilling tool and a center core member, The drilling tool has blades arranged on one circumference and an internal space recessed toward the rotary tool attachment portion, The center core member includes a center core bottom portion that is held by the workpiece, a center core side portion that contacts the inner wall of the wall surface of the drilling tool that constitutes the internal space of the drilling tool, and a center core holding means that holds the center core member and the workpiece, A hole drilling device characterized in that a side portion of a center core and an object to be processed are disposed perpendicularly.

2. A center core bottom portion that is held by the workpiece; A center core side portion that contacts an inner wall that defines an internal space of the drilling tool; A center core member and a center core holding means for holding an object to be processed are provided, A center core member, characterized in that the center core side portion and the workpiece are disposed perpendicularly.

3. a center core fixing step in which the center core member is held on the workpiece by a center core holding means; a pre-drilling preparation step in which the center core member is accommodated in an internal space of the drilling tool and a side portion of the center core is in contact with an inner wall constituting the internal space of the drilling tool; a drilling process in which the drilling tool is rotated by a rotary tool connected to a rotary tool attachment portion, causing a side portion of the center core to rub against an inner wall constituting an internal space of the drilling tool, thereby drilling a through hole vertically in the workpiece; A method for drilling a hole using a drilling tool and a center core, comprising:

4. A hole drilling device comprising a hole drilling tool and a center core member, The drilling tool has a plurality of blades arranged on one circumference and an internal space recessed toward the rotary tool attachment portion; The blades are arranged at positions on an imaginary line passing through the center of a single circumference, The center core member includes a center core bottom portion that is held by the workpiece, a center core side portion that contacts the inner wall of the wall surface of the drilling tool that constitutes the internal space of the drilling tool, and a center core holding means that holds the center core member and the workpiece, A hole drilling device characterized in that the workpiece is evenly cut away by the multiple blades to form through holes in the workpiece.

5. a center core fixing step in which the center core member is held on the workpiece by a center core holding means; a pre-drilling preparation step in which the center core member is accommodated in an internal space of the drilling tool and a side portion of the center core is in contact with an inner wall constituting the internal space of the drilling tool; a drilling process in which the drilling tool is rotated by a rotary tool connected to a rotary tool attachment part, causing a side portion of the center core to rub against an inner wall that constitutes an internal space of the drilling tool, and the workpiece is evenly scraped away by a plurality of blades arranged on an imaginary line passing through the center of the rotary tool to form a through hole in the workpiece; A method for drilling a hole using a drilling tool and a center core, comprising:

6. A hole drilling device comprising a hole drilling tool and a center core member, The drilling tool includes a drill member, blades arranged on one circumference, and an internal space recessed toward the rotary tool attachment portion, The center core member has a center core bottom portion that is held by the workpiece and a drill member installation portion into which a tip of the drill member is inserted and into which a side surface of the drill member contacts an inner wall of the through hole; A center core member and a center core holding means for holding an object to be processed are provided, A hole drilling device characterized in that a side portion of a center core and an object to be processed are disposed perpendicularly.

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