JP2013180330A - Tube material drilling tool - Google Patents

Abstract

A pipe material drilling tool capable of drilling a pipe material without deforming the pipe material.
A tube material hole having a support body for supporting a tube material and a drilling blade that is movably attached to the support body, and into which the drilling blade can be inserted into the tube material supported by the support body. In the opening tool, the support body is configured to include a pair of support pieces that support the pipe material and a support surface that is positioned between the support pieces so as to face the pipe material supported by the pair of support pieces, A side surface in which the opening blade is attached to the support body so as to be movable from one support piece to the other support piece, and the surface facing the other support piece is inclined from the front end to the original end side of the drilling blade A sharp cutting edge is provided, and the inclined surface constituting the cutting edge is positioned so as to face the support surface.
[Selection] Figure 4

Description

  The present invention relates to a tube material drilling tool.

  As is well known, metal pipes used for building materials are difficult to process because they are made of metal, so it is preferable to perform the desired processing in advance before bringing them to the site. There are many situations where it is not clear which part should be processed if it is not installed. For this reason, many tools that can easily process metal pipe materials have been developed in the field, and some of these tools are specialized for drilling metal pipe materials.

  For example, in Patent Document 1 described later, a main body provided with a die holding portion having a through hole at a position facing the installation portion on the left and right sides through an arm portion having a U shape from an installation portion having a through hole; A die fitted into the through-hole from the installation portion side, a die fixing nut for fixing the die fitted from the other side of the through-hole, and a through-hole penetrating through the installation portion A punch holder shaft that is slidably mounted, a punch that is fixed to the tip of the punch holder shaft, and a connecting block that is pivotally supported by a pivot pin at the rear end of the punch holder shaft and extends an operation handle. A pair of rocking arms for connecting the installation portion of the main body and the connecting block by a fixed fulcrum pin and a movable fulcrum pin, a stripper rotatably mounted by a pin above the installation portion of the main body, On the arm Comprising a positioning member bored fixed and at least one or more circular holes by a constant screw, manual punch is disclosed.

Japanese Utility Model Publication No. 60-66629

  However, in the manual punch disclosed in Patent Document 1, when attempting to make a hole in a tube formed of a thin metal plate for the purpose of weight reduction, the tube is deformed by the pressing of the punch. There was a problem.

  Therefore, the present inventor has made it a trial and error in order to achieve the realization of a tubular material drilling tool that can perform a drilling process on the tubular material without deforming the tubular material. As a result of repeated trial manufacture and experiment, the support body that supports the pipe material and the drilling blade that is movably attached to the support body are provided, and the drilling blade is inserted into the pipe material supported by the support body. In the tube material drilling tool, the support body includes a pair of support pieces for supporting the tube material and a support surface positioned between the support pieces so as to face the tube material supported by the pair of support pieces. The drilling blade is attached to the support body so as to be movable from one support piece to the other support piece, and the surface facing the other support piece is directed to the drilling blade from the tip to the original end side. Tilted side view If the slanted surface that constitutes the blade edge is positioned so as to face the support surface, the knowledge that should be perforated can be drilled without deforming the tube material And the above-mentioned technical problem has been achieved.

  The technical problem can be solved by the present invention as follows.

  That is, the pipe material drilling tool according to the present invention has a support body that supports the pipe material and a drilling blade that is movably attached to the support body, and drills the pipe material supported by the support body. A tube material drilling tool into which a blade can be inserted, wherein a support body is positioned between a pair of support pieces so as to face a pair of support pieces supporting the tube material and the pipe material supported by the pair of support pieces. The drilling blade is attached to the support body so as to be movable from one support piece to the other support piece, and the surface facing the other support piece is the tip of the drilling blade. A cutting edge with a sharp side view is provided that is inclined from the edge toward the original end side, and the inclined surface that constitutes the cutting edge is positioned so as to face the support surface.

  Further, the present invention provides the above-described tube material drilling tool, wherein the drilling blade is provided with a sharp edge in a side view in which the entire surface facing the other support piece is inclined from the tip toward the former end. is there.

  Further, according to the present invention, in any one of the above-described tube material drilling tools, the inclined surface of the blade edge is curved in a concave shape in a side view.

  According to the present invention, the perforated blade is provided with a sharp blade edge in a side view when the surface facing the other support piece is inclined from the tip toward the original end, and the inclined surface constituting the blade edge faces the support plate. In the process in which the cutting edge of the drilling blade is inserted into the wall surface of the pipe material, the inclined surface constituting the cutting edge continues to push the wall surface cut by the cutting edge toward the support surface side. In addition, since the wall surface is supported by the support surface, the deformation is prevented and the deformation of the entire pipe material is reduced.

  Therefore, it can be said that the industrial applicability of the present invention is very high.

FIG. 3 is a partially omitted perspective view showing the tube material drilling tool according to the first embodiment. FIG. 2 is a partially omitted side view showing a state in which both handles of the tube material drilling tool shown in FIG. 1 are opened. FIG. 2 is a partially omitted side view showing a state in which both handles of the tube material drilling tool shown in FIG. 1 are closed. FIG. 3 is a partially omitted cross-sectional view showing the tube material drilling tool shown in FIG. 2. It is explanatory drawing which showed the blade-tip part. FIG. 4 is a partially omitted partial cross-sectional view illustrating a method for using the tube material drilling tool according to Embodiment 1. FIG. 4 is a partially omitted partial cross-sectional view illustrating a method for using the tube material drilling tool according to Embodiment 1. FIG. 4 is a partially omitted partial cross-sectional view illustrating a method for using the tube material drilling tool according to Embodiment 1. FIG. 4 is a partially omitted partial cross-sectional view illustrating a method for using the tube material drilling tool according to Embodiment 1. It is explanatory drawing which showed the process of the drilling process of the pipe material by a drilling blade. FIG. 10 is an explanatory diagram showing a cutting edge portion according to Modification 1 of Embodiment 2. FIG. 10 is an explanatory diagram showing a cutting edge portion according to a second modification of the second embodiment.

Embodiments of the present invention will be described below.

  Embodiment

  As shown in FIGS. 1 to 4, the tube material drilling tool 1 according to the present embodiment includes a support body 2 that supports the tube material, a hole drilling blade 3 that is movably attached to the support body 2, and a hole. And a shielding plate 4 positioned so as to be aligned with the open blade 3. One handle 5 is connected and fixed to the support body 2, and the other handle 7 is connected to the punching blade 3 via a link structure 6. In FIGS. 1 to 4, the handle side of both handles is partially omitted.

  The support body 2 includes a pair of support pieces 9 and 10 protruding in a bifurcated shape from a flat portion 8 fixed to one handle 5. The flat portion 8 is formed with a long hole 11 extending from the original end side where the one handle 5 is fixed to the distal end side where the pair of support pieces 9 and 10 protrudes, and the movement of the link structure 6. The protrusion 12 for restricting is raised (see FIG. 2), and the support plate 13 is fixed by screwing so as to be positioned between the pair of support pieces 9 and 10. In addition, the support plate 13 is arrange | positioned so that the wide support surface 43 may face the protrusion direction of a pair of support pieces 9 and 10 (refer FIG. 1).

  The pair of support pieces 9 and 10 protrude from the flat portion 8 in the same direction in the same length, and the mutually opposing surfaces of the support pieces 9 and 10 are positioned in parallel. As shown in FIG. 4, guide holes 14 and 14 that pass through the support pieces 9 and 10 perpendicularly to the protruding direction are formed in the support pieces 9 and 10, and the guide holes formed in the support pieces 9 and 10. 14 and 14 are positioned coaxially with a tube material support space 15 provided between the support pieces 9 and 10 interposed therebetween. In the pair of support pieces 9, 10, the drilling blade 3 is always passed through the guide hole 14 of one support piece 9, and the drilling blade 3 is inserted into the guide hole 14 of the other support piece 10. It will be in the state passed only during the process of drilling. A cylindrical die 16 having an inner diameter that allows the perforating blade 3 to pass through the guide hole 14 of the other support piece 10 (the “die” is obtained when the wall surface of the tube material is viewed from the axial direction of the blade tip. It is an auxiliary tool for cutting into an outer shape, and has the same inner shape as the outer shape.) Is inserted from the tube material support space 15 side.

  The perforating blade 3 is movably passed through guide holes 14 and 14 formed in both support pieces 9 and 10, and has a long shaft portion 17 and a blade tip attached to the tip of the shaft portion 17. Part 18. The shaft portion 17 is inserted into the guide hole 14 so that the upper portion protrudes from one support piece 9, and the upper end portion of the upper portion protruding from the guide hole 14 is connected to the link structure 6. Further, as shown in FIG. 5A, the blade edge portion 18 is formed with a blade edge 20 formed by inclining the entire surface of the cylindrical member facing the other support piece 10 from the front end toward the original end side. The blade edge 20 is formed in a sharp shape that tapers toward the tip when viewed from the side with the inclined surface 19 as the front surface (see FIG. 5B). In addition, when the inclined surface 19 which comprises the blade edge | tip 20 is visually observed from a side surface, it has the shape curved concavely. As shown in FIG. 4, the blade edge portion 18 is fixed to the shaft portion 17 so that the inclined surface 19 of the blade edge 20 faces the support surface 43 of the support plate 13. In addition, the shaft part 17 and the blade edge part 18 are the fitting convexities formed on the surface of the blade edge part 18 facing the shaft part 17 in the fitting recess 21 formed on the surface of the shaft part 17 facing the blade edge part 18. The fitting convex portion 22 inserted into the fitting concave portion 21 is fastened and fixed by inserting the portion 22 and inserting a tightening screw (not shown) from the side surface of the shaft portion 17. Therefore, by removing the tightening screw from the side surface of the shaft portion 17, the blade edge portion 18 can be easily replaced with respect to the shaft portion 17.

  The shielding plate 4 is formed in an L shape in a side view, and includes a fixing portion 23 positioned parallel to the surface from which the upper portion of the punching blade 3 protrudes in one support piece 9, and extends vertically from the fixing portion 23. It is comprised from the shielding part 24 arrange | positioned so that the front end surface of the support pieces 9 and 10 may be followed. Note that the fixed portion 23 is screwed to the upper end surface of the upper portion of the perforating blade 3 so that the shielding plate 4 moves in conjunction with the movement of the perforating blade 3. Further, the shielding portion 24 has a long hole 25 that runs in the longitudinal direction, and a pair of guide pins 26 and 26 that are inserted into the distal end surface of one support piece 9 are passed through the long hole 25.

  As shown in FIG. 1, the link structure 6 has a structure in which link mechanisms 27, 27 having the same configuration are arranged on both sides so as to sandwich the support body 2. As shown in FIGS. 2 and 3, the link mechanisms 27, 27 include a substantially L-shaped first link member 29 in which one end 28 is connected to the other handle 7 and one end. 30 is comprised from the L-shaped 2nd link member 31 pivotally supported by the upper part of the perforation blade 3, and the 1st link member 29 and the 2nd link member 31 are the other side. The end portions 32 and 33 are rotatably connected. In addition, the support body 2 has a rotating body 34 movably fitted in a long hole 11 formed in the flat portion 8 (see FIG. 4), and both link mechanisms 27, 27 are connected to the respective link mechanisms 27. The corner portions 35 of the first link member 29 are connected to each other by being pivotally fixed to the rotating body 34. Then, the rotation of the first link member 29 with respect to the rotating body 34 and the rotation of the second link member 31 with respect to the perforating blade 3 are regulated by the protrusion 12 rising from the flat portion 8 of the support body 2.

  The second link member 31 is disposed closer to the distal end side of the support body 2 than the first link member 29. The first link member 29 is connected to the other end portion 32 connected to the second link member 31 through the corner portion 35 bent at an obtuse angle from the one end portion 28 connected to the other handle 7. A stopper 36 for preventing contact between the handles 5 and 7 protrudes between the end portion 28 and the corner portion 35 on one side. The second link member 31 is connected to the first link member 29 via a corner portion 37 bent at a right angle from one end portion 30 connected to the upper portion of the punching blade 3. The other end portion 33 and the corner portion 37 are positioned in parallel to the perforating blade 3 so as to avoid the tube material support space 15.

  Next, the usage method of the pipe material drilling tool 1 which concerns on this Embodiment is demonstrated based on FIGS. FIGS. 6 to 9 are partial cross-sectional views showing sections other than the handles 5 and 7 and the link structure 6, and the handle side of both handles is partially omitted.

  First, as shown in FIG. 6, when the other handle 7 is opened at a maximum angle with respect to one handle 5, the first link member 29 has a base end of the long hole 11 in which the corner portion 35 is formed in the support body 2. The end 32 on the other side is in contact with the protrusion 12 rising from the support body 2. Thereby, the first link member 29 has the other end 32 on the uppermost side with respect to the support body 2 in a situation where the rotation about the corner portion 35 as the rotation axis is restricted by the protrusion 12 rising from the support body 2. Position on the side (upper side in FIG. 6). Accordingly, the punching blade 3 and the shielding plate 4 are positioned on the uppermost side (the upper side in FIG. 6) with respect to the support body 2 through the second link member 31 connected to the first link member 29. .

  At this time, the cutting edge 20 of the perforating blade 3 is stored in a guide hole 14 formed in one support piece 9, and the shielding plate 4 has a gap formed between the support pieces 9 and 10. Do not shield. Therefore, in this state, the tube material 38 is fitted into the tube material support space 15 from the gap formed between the both support pieces 9 and 10, and the tube material 38 is supported by the both support pieces 9 and 10. Accordingly, the wall surface 40 facing the one support piece 9, the wall surface 39 facing the other support piece 10, and the wall surface 41 facing the support plate 13 in the pipe member 38 are in close contact with the surfaces of the facing members, respectively. It will be in the state where it provided the slight clearance gap and was positioned in parallel.

  Next, as shown in FIG. 7, when the other handle 7 is slightly closed with respect to one handle 5 from a state where it is opened at the maximum angle, the first link member 29 becomes a long hole 11 formed in the support body 2. The other end 32 is slightly moved to the lower side (lower side in FIG. 7) of the support body 2. Along with this, the punching blade 3 and the shielding plate 4 slightly move to the lower side (lower side in FIG. 7) through the second link member 31 connected to the first link member 29. .

  At this time, the blade edge 20 of the punching blade 3 protrudes downward from the guide hole 14 formed in the one support piece 9 and comes into contact with the wall surface 40 facing the one support piece 9 in the pipe member 38, and the shielding plate 4 is The gap formed between the support pieces 9 and 10 is slightly shielded, and is placed in close contact with the wall surface 42 seen from between the support pieces 9 and 10 in the pipe member 38 or provided in parallel with a slight gap. To face each other. Thereby, when the wall surface 40 facing the one support piece 9 in the tubular material 38 is pressed by the cutting edge 20 of the punching blade 3, the tubular material 38 is prevented from being crushed into a diamond shape in cross section.

  Next, as shown in FIG. 8, when the other handle 7 is further closed from the state where the other handle 7 is opened at the maximum angle with respect to the one handle 5, the first link member 29 is moved to the long hole 11 formed in the support body 2. The corner portion 35 positioned on the former end side is rotated about the rotation axis, and the other end portion 32 is further moved to the lower side (lower side in FIG. 8) of the support body 2. Along with this, the punching blade 3 and the shielding plate 4 further move to the lower side (lower side in FIG. 8) via the second link member 31 connected to the first link member 29.

  At this time, the cutting edge 20 of the punching blade 3 protrudes from the guide hole 14 formed in the one support piece 9 and penetrates the wall surface 40 facing the one support piece 9 in the pipe member 38, and the shielding plate 4 is supported on both sides. The gap formed between the pieces 9 and 10 is further shielded so as to be in close contact with the wall surface 42 seen from between the two support pieces in the pipe member 38 or to be positioned in parallel with a slight gap.

  A process in which the cutting edge 20 of the punching blade 3 penetrates the wall surface 40 facing the one support piece 9 in the pipe 38 will be described in detail with reference to FIG. 10A to 10D, the cross-sectional view described on the upper side shows the positional relationship between the punching blade 3, the pipe material 38, and the support surface 43, and the plane described on the lower side. The figure shows the shape of the hole formed in the wall surface 40 of the pipe material 38 by the drilling blade 3 in the positional relationship of the upper cross-sectional view.

  First, as shown in FIG. 10A, when the drilling blade 3 further moves in the direction of the blade edge from the state in which the blade edge 20 is in contact with the wall surface 40 of the tube material 38, the edge of the blade edge 20 is moved with respect to the wall surface 40 of the tube material 38. A tip formed in a sharp shape is inserted. Next, as shown in FIG. 10B, when the drilling blade 3 further moves in the direction of the blade edge from the state in which the tip of the blade edge 20 is inserted into the wall surface 40 of the tube material 38, the blade edge with respect to the wall surface 40 of the tube material 38. Until the wall 20 is inserted to the position of the maximum width, the wall surface 40 of the pipe member 38 is cut in accordance with the outer shape of the blade edge 20 while being pushed by the inclined surface 19 of the blade edge 20 and being pushed into the tube material 38. Next, as shown in FIG. 10C, when the perforating blade 3 moves further in the direction of the blade edge from the state where the blade edge 20 is inserted into the wall surface 40 of the tube material 38 to the position of the maximum width, the hole blade 3 moves to the wall surface 40 of the tube material 38. On the other hand, until the entire blade edge 20 is inserted, the wall surface 40 of the tube material 38 is torn in accordance with the maximum width of the blade edge 20 while being pushed by the inclined surface 19 of the blade edge 20 and being pushed into the tube material 38. Finally, as shown in FIG. 10 (d), when the perforating blade 3 moves further from the state in which the entire blade edge 20 is inserted into the wall surface 40 of the tube material 38 in the direction of the blade edge, the wall surface 40 of the tube material 38 becomes the hole blade. 3, while being pushed into the inner side of the pipe member 38 by being pushed by the outer peripheral surface 3, it tears slightly according to the maximum width of the cutting edge 20. Thus, in the process in which the cutting edge 20 of the perforating blade 3 is inserted into the wall surface 40 of the tube material 38, the wall surface 40 where the inclined surface 19 constituting the blade edge 20 is always cut is used as the inner surface of the tube material 38 and the support surface 47. The wall surface 41 facing the inclined surface 19 of the pipe member 38 is subjected to a load in the vertical direction and is easily deformed. However, the wall surface 41 is deformed by contact with the support surface 43. Is blocked.

  Finally, as shown in FIG. 9, when the other handle 7 is closed at a minimum angle with respect to the one handle 5, the first link member 29 is positioned on the former end side of the long hole 11 formed in the support body 2. While the corner portion 35 is moved toward the distal end side of the long hole 11, the corner portion 35 is rotated about the rotation axis, and a stopper 36 protruding from between one end portion 28 and the corner portion 35 is provided on the other side. Contact the handle 7. As a result, the first link member 29 has the end 32 on the other side on the lowermost side of the support body 2 (in FIG. 9) in a situation where the rotation of the corner portion 35 as the rotation axis is restricted by the other handle 7. , Lower). Along with this, the punching blade 3 and the shielding plate 4 move to the lower side of the support body 2 (lower side in FIG. 9) via the second link member 31 connected to the first link member 29.

  At this time, the cutting edge 20 of the punching blade 3 protrudes from the guide hole 14 formed in the one support piece 9 and passes through the wall surface 39 facing the other support piece 10 in the pipe member 38, and then the other support piece 10. The shield plate 4 is inserted into the guide hole 14 formed in the wall 38 and completely blocks the gap formed between the two support pieces 9, 10, and the wall surface 42 viewed from between the two support pieces 9, 10 in the pipe 38. So as to be positioned in parallel with a slight gap. Thereby, each wall surface of the pipe material 38 supported by a pair of support pieces 9 and 10 will be in the state enclosed by the surface parallel to each said wall surface. In addition, the wall surface 39 penetrated by the drilling blade 3 of the tube material 38 is the cutting edge of the cutting edge portion 18 of the drilling blade 3 by the action of the die 16 inserted into the guide hole 14 of the other support piece 10 facing the wall surface 39. 20 is completely punched in accordance with the outer shape viewed from the axial direction, and the punched wall surface 39 is discharged downward from the guide hole 14 of the other support piece 10.

  When removing the tube 38 that has been drilled from the tube support space 15, the blade 20 of the drilling blade 3 is opened by opening the other handle 7 to the maximum angle with respect to the one handle 5 again. What is necessary is just to place it in the guide hole 14 formed in the one support piece 9, and position the shielding board 4 so that the clearance gap formed between both the support pieces 9 and 10 may not be shielded.

  Embodiment 2. FIG.

  The present embodiment is a modification of the cutting edge portion of the punching blade in the first embodiment. In FIGS. 11 and 12, the same reference numerals as those in FIGS. 1 to 10 denote the same or corresponding parts.

  Modified Example 1: (a) of FIG. 11 shows a perspective view of a cutting edge part according to Modified Example 1, and (b) of FIG. 11 shows a side view of the cutting edge part according to Modified Example 1. The cutting edge portion 18 according to Modification 1 is formed with a cutting edge 44 that is formed by inclining the tip surface of a quadrangular prism-shaped member in two steps from the tip toward the original end while the angle is reduced. 44 is formed in a sharp shape that tapers toward the tip when viewed from the side with the inclined surface 45 as the front surface (see FIG. 11B). In addition, when the inclined surface 45 which comprises the blade edge | tip 44 is visually observed from a side surface, it has the shape bent in V shape.

  In the cutting edge portion 18 according to this modification, a substantially square hole can be opened in the pipe material.

  Modification 2: FIG. 12A shows a perspective view of the cutting edge part according to Modification 2, and FIG. 12B shows a plan view of the cutting edge part according to Modification 2. FIG. The cutting edge portion 18 according to the modified example 2 has the cutting edge 46 formed without inclining half of the front end surface of the cylindrical member from the front end toward the original end side and without inclining the remaining half of the front end surface. A part of 46 is formed in a sharp shape that tapers toward the tip when viewed from the side with the inclined surface 47 as the front. In addition, when the inclined surface which comprises the blade edge | tip 46 is visually observed from a side surface, it has the shape bent in V shape.

  Also in the cutting edge part 18 which concerns on this modification, the substantially U-shaped hole can be opened with respect to a pipe material similarly to the said Embodiment 1. FIG.

  In each of the above embodiments, as the power for moving the drilling blade relative to the support body, manual opening and closing of the pair of handles is used, but the power is not limited to this, for example, The drilling blade may be moved relative to the support body using hydraulic pressure.

  Further, in the first embodiment, a structure is adopted in which guide holes are formed in both support pieces of the pair of support pieces, and the drilling blade penetrates the tube material supported by the pair of support pieces. However, a structure may be adopted in which guide holes are formed only in one support piece, and a drilling blade is inserted without penetrating through a pipe supported by a pair of support pieces.

  In the first embodiment, since the tube material to be drilled has a square cross section, the shape of the support surface is flattened, but the shape of the support surface is changed according to the shape of the tube material. It is preferable.

  Further, the shape of the cutting edge of the perforating blade is not limited to the shape of the cutting edge according to the above-described embodiment, but may be other shapes.

  In the first embodiment, the die is provided on the other support piece. However, the hole can be drilled on the wall surface facing the other support piece of the pipe material without providing the die. In addition, in a state where the blade edge of the drilling blade is passed through the guide hole of the other support piece, a part or all of the inner surface of the guide hole facing the inclined surface of the blade edge is separated from the original end side of the blade edge. Then, when drilling is performed on the wall surface facing the other support piece of the pipe material, the wall surface is not completely cut by the cutting edge, but is cut in a state where a part is connected. Work efficiency is improved.

DESCRIPTION OF SYMBOLS 1 Tube material drilling tool 2 Support main body 3 Drilling blade 4 Shielding plate 5 One handle 6 Link structure 7 The other handle 8 Flat part 9 One support piece 10 The other support piece 11 Long hole 12 Protrusion 13 Support plate 14 Guide hole DESCRIPTION OF SYMBOLS 15 Pipe material support space 16 Dies 17 Shaft part 18 Blade edge part 19 Inclined surface 20 Blade edge 21 Fitting recessed part 22 Fitting convex part 23 Fixing part 24 Shielding part 25 Long hole 26 Guide pin 27 Link mechanism 28 End part on one side 29 First Link member 30 One end portion 31 Second link member 32 The other end portion 33 The other end portion 34 Rotating body 35 Corner portion 36 Stopper 37 Corner portion 38 Tubing materials 39, 40, 41, 42 Wall surface 43 Support surface 44 Cutting edge 45 Inclined surface 46 Cutting edge 47 Inclined surface

Claims (3)

A tube material drilling tool that has a support body that supports a pipe material and a drilling blade that is movably attached to the support body, and can insert the drilling blade into the pipe material supported by the support body. The support body has a pair of support pieces that support the pipe material and a support surface that is positioned between the support pieces so as to face the pipe material supported by the pair of support pieces. A side view that is attached to the main body so as to be movable from one support piece to the other support piece, and in which the surface facing the other support piece is inclined from the tip toward the base end side of the perforated blade. A tubular material drilling tool, wherein a sharp blade edge is provided and an inclined surface constituting the blade edge is positioned so as to face a support surface. 2. The tube material drilling tool according to claim 1, wherein the drilling blade is provided with a sharpened blade tip in a side view in which the entire surface facing the other support piece is inclined from the tip toward the tip end. The tube material drilling tool according to claim 1, wherein the inclined surface of the cutting edge is curved in a concave shape in a side view.

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