JP4378759B2 - Punching tool and its contact portion forming body - Google Patents

Description

  The present invention relates to a drilling tool for drilling a through-hole in a wall material or the like of a building and a contact portion forming body thereof, and more particularly to a drilling tool for preventing a drilling blade from being damaged during penetration of a drilled body and its The present invention relates to a contact portion forming body.

  Conventionally, as a drilling tool for drilling a wall material or the like of a building, one disclosed in Japanese Utility Model Laid-Open No. 6-21811 is shown in FIG.

  In FIG. 10, a punching tool 41 has a rod-like support material 43 attached perpendicularly to a main shaft 42 having a center drill 42 a at the tip, and a blade body 44 having a pair of drilling blades 45 on the support material 43. Is installed. The blade body 44 is provided with a bolt 46 so as to move along the support member 43 by loosening a nut 47.

  However, in the punch 41, the positioning of the center drill 42a that has been positioned is released when the drilling blade 45 that rotates about the main shaft 42 penetrates the drilled body such as the wall material 51. The punching blade 45 collides with the inner surface 52a of the through-hole 52 drilled in the lateral direction due to the momentum or the moment when penetrating. For this reason, the perforating blade 45 may be broken by this collision, which is dangerous.

  In particular, as shown in FIG. 11, the punching tool having the above-described configuration is disclosed in Japanese Patent Application Laid-Open No. 10-42430 by the applicant of the present application so that the opening 54 of the wiring box 53 installed on the back surface side of the wall agent 51 faces the wall surface. In the case where the superposition hole 55 such as a dharma hole indicated by a two-dot chain line is drilled in the wall material 51 as described in FIG. When drilling the hole 55b, the drilling blade sways laterally and easily collides with the inner surface of the existing first through hole 55a. The danger of being twisted cannot be avoided.

  By the way, according to the punching tool disclosed in Japanese Patent Laid-Open No. 10-42430, the chip receiving cover is in pressure contact with the peripheral edge portion of the through-hole 55 even after the wall material of the drilling blade is penetrated. On the other hand, since the punching tool can be prevented from shaking in the lateral direction, it is possible to prevent the punching blade from colliding with the inner surface of the first through hole 55a after being penetrated and breaking. However, since the chip receiving cover is indispensable for this drilling tool, there is a problem that the entire drilling tool becomes large, the structure is complicated, and the cost is increased.

  Further, the punching tool described in the above-mentioned Japanese Patent Application Laid-Open No. 10-42430 has no contact space of the chip receiving cover with respect to the peripheral portion of the through hole 55 to be drilled, or an obstacle such as a pillar is on the wall surface. In the case where the chip receiving cover cannot be brought into contact with the wall member 51, the drill receiving operation is often hindered by the presence of the chip receiving cover.

  In the punching tool 48 having a structure described in Japanese Patent Laid-Open No. 6-91417 shown in FIG. 12, a plurality of punching blades 50 protrude along the opening edge of the cylindrical core body 49. At the time of penetration, the drilling blade 50 moves straight without being shaken in the lateral direction, with the entire outer peripheral surface of the core body 49 being guided, so the above-described problems do not occur.

  However, the drilling blade 50 is extremely expensive, and all the replacement of the drilling blade 50 must be replaced together with the core body 49, which is cumbersome and uneconomical. Furthermore, when drilling through holes having different diameters, there is a problem in that a plurality of core bodies 49 must be prepared corresponding to the diameters of the holes.

  Therefore, the present invention provides a punching tool and its contact portion forming body that can be safely operated by preventing the drilling blade from being damaged when the drilled body is penetrated without providing a chip receiving cover that can be an obstacle to the drilling work. The issue is to provide

According to a first aspect of the present invention, there is provided a perforating tool having a plurality of independently projecting perforating blades that rotate about a center axis and that are independently detachable. A drilling tool for drilling
Inserted into the cutting groove of the drilled body cut by the drilling blade during drilling,
The inner surface abutting portion separate from the perforation blade that can abut against the inner surface of the through-hole and prevent the perforation blade from colliding with the inner surface of the through-hole when the drilled body is penetrated is cut by the perforation blade. It is characterized by being erected in the protruding direction of the drilling blade with the same radius of curvature as the cutting groove.

According to a second aspect of the present invention, there is provided a perforating tool having a plurality of independently projecting perforating blades that project about a center axis and that project independently from each other , and each of the perforating tools has a through- hole. A drilling tool for drilling
Inserted into the cutting groove of the drilled body cut by the drilling blade during drilling,
The inner surface abutting portion separate from the perforation blade that can abut against the inner surface of the through-hole and prevent the perforation blade from colliding with the inner surface of the through-hole when the drilled body is penetrated is cut by the perforation blade. Standing in the protruding direction of the drilling blade with the same radius of curvature as the cutting groove
And a peripheral abutting portion that abuts a peripheral edge of the through hole of the drilled body and prevents the punching blade from being pushed into the drilled body beyond a certain level.

  According to a third aspect of the present invention, in the invention of the first or second aspect, at least one of the inner surface contact portion and the peripheral edge contact portion is attached to the punch blade or the punch device body. It is provided in a separate abutting portion forming body, and the abutting portion forming body is attached so as to be adjustable in position in the longitudinal direction of the center shaft.

  A punching tool according to a fourth aspect of the present invention is the punching tool according to any one of the first to third aspects, wherein at least one of the inner surface contact portion and the peripheral contact portion is the punching blade or the punching tool. Provided in a separate contact portion forming body attached to the main body, the contact portion forming body having a holding portion that holds the perforating blade and prevents its tilting. is there.

  According to a fifth aspect of the present invention, there is provided a punching tool according to the third or fourth aspect of the invention, wherein the contact portion forming body includes a holding portion for holding the punching blade. .

  A punching tool according to a sixth aspect of the present invention is the punching tool according to any one of the third to fifth aspects, wherein the plurality of drilling blades are connected to each other by the one contact portion forming body. It is characterized by this.

  According to a seventh aspect of the present invention, in the punching tool according to any one of the third to sixth aspects, the contact portion forming body is formed of a metal plate through which the center shaft passes. It is characterized by.

  A punching tool according to an eighth aspect of the present invention is the punching tool according to any one of the first to seventh aspects, wherein the center shaft is biased so as to be able to advance and retreat and is positioned on the drilled body. By being pressed by the body to be perforated, it is retracted without penetrating the body to be perforated.

The punching tool according to the ninth aspect of the invention is adjusted to position on a plurality of independently protruding punching blades or punching tool bodies that rotate about the center axis of the punching tool and that are independently detachable. The drilling blade is inserted freely into the cutting groove of the drilled body cut by the drilling blade during drilling, and abuts against the inner surface of the through-hole when penetrating the drilled body. The inner surface contact portion that is separate from the drilling blade that can prevent collision with the inner surface of the through hole is erected in the protruding direction of the drilling blade with the same radius of curvature as the cutting groove cut by the drilling blade. It is what.

The punching tool according to the invention of claim 10 is adjusted about the position of a plurality of independently protruding punching blades or punching tool bodies that rotate about the center axis of the punching tool and are independently detachable. Axially attached to a plurality of independently projecting drilling blades or drilling tool bodies that are freely attached and can be adjusted in position to a plurality of independently projecting drilling blades or drilling tool bodies provided at the time of drilling The piercing blade is attached so as to be adjustable in position and inserted into a cutting groove of the drilled body cut by the piercing blade during drilling, and abuts against the inner surface of the through-hole when penetrating the drilled body. An inner surface abutting portion separate from the drilling blade that can prevent collision with the inner surface of the through hole, and standing in the protruding direction of the drilling blade with the same radius of curvature as the cutting groove cut by the drilling blade,
A peripheral abutting portion is provided that abuts against a peripheral edge of the through hole of the drilled body to prevent the punching blade from being pushed into the drilled body beyond a certain level.

The drilling tool is configured to drill a through hole in a drilled body by a plurality of independently projecting drilling blades that rotate about a center axis, and the drilled body is cut by the drilling blade during drilling. An inner surface abutting portion that is inserted into the cutting groove and can abut against the inner surface of the through-hole when penetrating the body to be drilled to prevent the drilling blade from colliding with the inner surface of the through-hole. is there. Therefore, without providing a chip receiving cover that can be an obstacle to the drilling operation, the drilling blade can be prevented from being damaged during penetration of the drilled body, and the drilling operation can be performed safely.

  Embodiments of the present invention will be described below with reference to FIGS.

  In the figure, a shank shaft 3 is inserted into a central through hole 2a of a punching tool body 2 integrally formed of synthetic resin or the like, and the center shaft 4 is axially inserted into the shank shaft 3 from one end side. It is inserted so that it can move forward and backward. As shown in FIG. 6, the shank shaft 3 is formed with an attachment portion 3a that is detachably attached to a rotary drive body (not shown) at one end thereof, and the other end is opened, and from the opening to the inside. A spring accommodating portion 3b for accommodating the coiled spring 5 shown in FIG. 2 is formed. Further, as shown in FIG. 2, a non-rotating sleeve 3c for preventing the center shaft 4 from rotating about its axis is formed on the inner surface of the spring accommodating portion 3b of the shank shaft 3 in the axial direction. As shown in FIG. 7, the center shaft 4 has a center drill 6 fixedly attached to a round hole 4a provided at a front end portion thereof, a circular tube 4b is forcibly fitted on a rear end portion thereof, and Two corrugated spring pins 4c are press-fitted in the radial direction into the circular tube 4b. The center shaft 4 can be moved back and forth in the axial direction against the urging force extending in the axial direction by the spring 5 with a part thereof being inserted into the spring accommodating portion 3b of the shank shaft 3. When one side surface of the circular tube 4b comes into contact with one side surface of a C-shaped retaining ring 4d fitted in an annular groove 3d carved on the inner surface of the tip end portion of the shank shaft 3, it is possible to fly from the shank shaft 3 to the outside. Out is blocked.

  As shown in FIGS. 1 to 3, a pair of rectangular parallelepiped blade holding bases 8 for holding one end of the punching blade 7 are attached to the bottom surface 2 b formed on the punching side of the punching tool main body 2. . The blade holding base 8 is inserted into a long hole 8a that passes through the blade holding base 8, and a bolt 9 is screwed into a nut 10 embedded in the punching tool body 2 so as to be perpendicular to the axis. It is mounted so that it can move a certain distance. In this case, the distance from the shaft center to the drilling blade 7, that is, the drilling radius can be adjusted to correspond to the plurality of through holes 52 having different diameters. In this case, the distance from the shaft center to each drilling blade 7 is naturally adjusted to be the same. A parallel groove 8b slightly shallower than the plate thickness of the drilling blade 7 is formed in the outer surface of the blade holding base 8 in the axial direction. In addition, a locking projection 8c that protrudes slightly outward is provided at the approximate center of the outer surface of the blade holding base 8, while one end of the drilling blade 7 is engaged with the locking projection 8c. A locking hole 7a for stopping is formed. Therefore, the perforating blade 7 is fitted into the parallel groove 8b of the holding base 8, and the locking holes 7a of the perforating blade 7 are locked to the locking projections 8c of the blade holding base 8, and then both left and right edges. By tightening the screw 11, one end is sandwiched at a fixed position between the blade holding base 8 and the head of the screw 11.

  In addition, in claim 1, “independently projecting drilling blade” means a drilling blade in which one end is held by the blade holding base 8 and is erected on the wall member 51 side, and is shown in FIG. The drilling blade formed integrally with the core body 49 along the outer periphery of the tip of the core body 49, such as the conventional drilling blade 50, is excluded.

  A contact plate 21 formed by pressing a metal plate material shown in FIGS. 8 and 9 is disposed on the center shaft 4 so as to be movable perpendicularly to the center shaft 4 passing therethrough. The abutment plate 21 is a feature of the present application, has a substantially disk shape, and a pair of mounting flanges 22 are bent at right angles to the punching tool main body 2 side at opposite positions of the peripheral ends thereof. Yes.

  Further, in other portions of the peripheral end portion of the contact plate 21, contact flanges 23 bent at right angles to the through holes to be drilled are formed along a circular arc on the outer periphery. ing. Therefore, the free end surface of the contact flange 23 also has an arc shape with the same radius of curvature as the outer periphery of the flat portion of the contact plate 21. The height of the contact flange 23 is smaller than the protruding length of the drilling blade 7 protruding from the contact plate 21 in the direction of the wall material 51. The contact flange 23 corresponds to an inner surface contact portion in claims.

  Further, a contact piece that protrudes in the radial direction between the mounting flange 22 and the contact flange 23 at the peripheral end portion of the contact plate 21 and comes into contact with the peripheral portion of the through-hole 52 when drilling is performed. 24 is formed. The contact piece 24 is formed on an inclined surface slightly curved toward the punching tool main body 2 with the outer periphery of the flat portion of the contact plate 21 as a base end. The contact piece 24 corresponds to a peripheral contact portion in claims.

  An insertion hole 25 through which the center shaft 4 is inserted is formed at the center of the abutment plate 21 and a pair of mounting holes 26 are formed at a predetermined distance from the center of the plane. A mounting rod 27 having a screw hole on the contact end side is in contact with the back side surface of the mounting hole 26, and a mounting screw 28 is screwed into the screw hole from the other side surface of the contact plate 21. It is integrally attached to the contact plate 21. The other end of the mounting rod 27 is movably inserted into a through hole 2c provided in the punching tool main body 2. The attachment rod 27 together with the piercing blade 7 holds the abutting plate 21 in parallel with a predetermined distance from the bottom surface 2b of the piercing tool main body 2.

  Furthermore, a weld nut 29 is welded and attached to the surface of the mounting flange 22 of the contact plate 21 on the center shaft 4 side, and the perforating blade 7 is in contact with the outer surface of the mounting flange 22 and further outward. Then, the blade clamping piece 30 is brought into contact with and the two screws 31 are screwed onto the weld nut 29, whereby the mounting flange 22 and the blade clamping piece 30 clamp the substantially intermediate portion in the longitudinal direction of the drilling blade 7. It is like that. That is, from the abutment plate 21 side, the abutment plate 21 loosens the screw 31 and moves it in the axial direction, and one end of the abutment plate 21 has an arbitrary height with respect to the drilling blade 7 attached to the blade holder 8. Has come to be supported. Accordingly, the length of the punching blade 7 protruding from the contact plate 21 toward the through hole 52 is arbitrarily adjusted according to the thickness of the wall material 51. Further, it is possible to prevent bending or shaking to the side of the shaft, which is the inner side during drilling.

  The perforation blade 7 can be appropriately adjusted the distance from the axial center corresponding to the inner diameter of the through-hole 52 to be perforated, and the abutting plate 21 disposed between the pair of perforation blades 7 corresponding thereto is also provided. Several types with different diameters are available.

  Next, an operation of providing a through hole using the punching tool of the present embodiment configured as described above will be described.

  First, although not shown, a magnet attached to the front surface of the wiring box disposed behind the wall is detected using a magnetic detector, and the center of the through hole 52 having a predetermined diameter to be drilled is determined. Next, the bolt 9 of the blade holding base 8 of the punch 1 is loosened according to the size of the through hole 52, the blade holding base 8 is moved in the lateral direction and held at a predetermined position, and the screw 11 is used. The drilling blade 7 is attached to the outer surface of the blade holder 8. Then, the contact plate 21 that matches the distance between the pair of attached drilling blades 7 is selected, and the punching blade 7 is clamped by the mounting flange 22 and the blade clamping piece 30 so that the contact plate 21 is punched. The main body 2 is held at a predetermined distance from the bottom surface 2b. At this time, the distance separating the contact plate 21 from the bottom surface 2b is adjusted so that the length of the drilling blade 7 protruding from the contact plate 21 toward the through hole 52 matches the thickness of the wall material. .

  In this way, after adjusting the distance between the pair of drilling blades 7 and adjusting the holding height of the contact plate 21 for the drilling tool 1, the center drill 6 of the drilling tool 1 is brought into contact with the drilling center, and the drilling tool 1 is drilled. To start. Here, although the center drill 6 of the center shaft 4 gradually receives a reaction force from the wall material 51 with the drilling, the spring 5 which is biased in the axial direction is housed in the spring housing portion 3b of the shank shaft 3. Therefore, when a pressing force of a certain level or more is applied, it moves backward to the back side of the spring accommodating portion 3b. Accordingly, the center drill 6 does not punch out the wall material 51, and the tip of the center drill 6 stops while being partially embedded in the wall material, and the center shaft 4 is always stably held at a fixed position during drilling. . As a result, the wiring box 53 on the back of the wall, the cable, the wiring apparatus, and the like are prevented from being damaged by the center drill 6 punching out the wall material 51 and protected.

  Next, when the tip of the punching blade 7 reaches the surface of the wall material 51, the punching blade 7 starts drilling. When the cutting proceeds to a certain depth of cut, as shown in FIG. 5, the tip of the contact flange 23 of the contact plate 21 reaches the surface of the wall material 51, and thereafter the wall material cut by the punching blade 7. It fits in 51 narrow cutting grooves 5.

  At this time, since the drilling blade 7 is formed in a flat plate shape having a predetermined width, the width of the cutting groove S inevitably becomes larger than the plate thickness by the amount of protrusion at both ends of the outer surface of the drilling blade 7 when rotated. On the other hand, since the contact flange 23 is formed in an arc shape, the width of the track drawn by rotation always coincides with the plate thickness of the contact flange 23. That is, if this is shown in FIG. 5, the outer diameter R3 of the contact flange 23 is smaller than the radius R1 to both ends P1 of the outer surface of the drilling blade 7 forming the outer diameter of the cutting groove S, and the contact flange 23. The inner diameter R4 is larger than the radius R2 to the inner surface central portion P2 of the drilling blade 7 forming the inner diameter of the cutting groove S, that is, R1> R3> R4> R2. Therefore, the contact flange 23 of the contact plate 21 is always located in the narrow cutting groove S cut by the punching blade 7, so that the contact flange 23 slides strongly against the inner surface 52a of the through hole 52 during drilling. The cutting groove S is inserted into the cutting groove S without receiving a large resistance.

  As a result, immediately before the wall material 51 is cut and punched, the outer surface of the contact flange 23 contacts the inner surface 52a of the through hole 52 or is separated by a very small gap. For this reason, even if the through-hole 52 is punched and the positioning of the center drill 6 is released, the drilling blade 7 is guided by the abutting flange 23 of the abutting plate 21 and does not sway in the lateral direction. It goes straight, and the punching blade 7 is prevented from colliding with the inner surface 52a of the through-hole 52 by hitting the penetrating blade 7 in the lateral direction due to the penetration at the time of penetration. Further, the free end sides of the pair of opposed punching blades 7 are connected and held by a single abutment plate 21 at a substantially intermediate portion in the longitudinal direction. For these reasons, the pair of perforating blades 7 are not broken by an impact at the time of collision, and therefore the risk of injury by the perforating blades 7 can be avoided. Further, the lateral movement of the drilling blade 7 is restricted by the contact plate 21 and is prevented from being bent laterally, particularly to the shaft side during drilling, so that it is held at a fixed position, so that the dimensional accuracy of the through hole 52 is increased. Can do.

  Immediately after punching the through hole 52, the contact piece 24 of the contact plate 21 contacts the flat portion of the periphery of the through hole 52, so that the perforation blade 7 is longer than the length necessary for penetration. Insertion into 52 is prevented. For this reason, the punching blade 7 is inserted into the wiring box with the force of punching the wall material 51, and the wiring box 53, the cable in the wiring box 53, the wiring device, etc. are scratched or damaged at the tip. Is prevented.

  Here, since the contact piece 24 is slightly curved toward the punching tool body 2 with the outer periphery as a boundary, only the bent portion of the contact piece 24 comes into contact with the peripheral plane of the through hole after the penetration. The portion on the free end side is slightly separated from the flat portion on the periphery of the through hole 52 toward the punching tool main body 2 side. For this reason, if the contact piece 24 is exactly the same plane as the disc portion of the contact plate 21 without slightly warping to the punching tool body 2 side, the entire contact piece 24 is strongly flat on the periphery of the through hole 52. However, the contact piece 24 of the present application is slightly curved toward the punching tool body 2 side, and the contact piece 24 Since the contact area with the flat surface portion of the peripheral edge of the through hole 52 is small, the sliding resistance generated with rotation is small. For this reason, the load applied to the worker and the tool during the work is reduced, the work can be performed safely and easily, and the tool is prevented from being damaged. Further, it is possible to prevent a scratch from being generated on the flat portion of the periphery of the through hole 52.

  Here, the drilling tool 1 loosens the screw 31 to adjust the mounting height of the contact plate 21, and the projection length of the drilling blade 7 from the contact plate 21 is required to cut the wall material 51 to the minimum. By adjusting the length, drilling can be performed corresponding to an arbitrary wall thickness.

  As described above, the punching tool of this embodiment is such that the through hole 52 is drilled in the wall material 51 by the pair of independently projecting punching blades 7 that rotate about the center shaft 4. It is inserted into the cutting groove S of the wall material 51 cut by the perforating blade 7, and abuts the inner surface 52 a of the through hole 52 when the wall material 51 penetrates, so that the perforating blade 7 is in contact with the inner surface of the through hole 52. Abutting flange 23 as an inner surface abutting portion that can prevent collision with 52a and a perimeter of the through hole 52 of the wall material 51, and the perforation blade 7 is pushed into the wall material 51 more than a certain amount And an abutment piece 24 as a peripheral abutment portion for preventing the above.

  Therefore, it is possible to safely perform the drilling operation without providing a chip receiving cover that can be an obstacle to the drilling operation and preventing the drilling blade 7 from being damaged when the wall material 51 as the drilled body is penetrated.

  By the way, the contact plate 21 as the contact portion forming body of the present embodiment is attached to the drilling blade 7 via the blade clamping piece 30 by tightening the screw 31, but is not limited thereto. Various attachment means can be adopted. For example, the attachment rod 27 may be directly attached to the punching tool main body 2 via the attachment rod 27 by fixing the attachment rod 27 to a fixed position of the punching tool main body 2. When the contact plate 21 is attached to the punching tool body 2, the contact plate 21 is also attached to the punching blade 7 or simply held by the punching blade 7 so as to be movable in the axial direction. You can also. Even when the abutting plate 21 is merely held movably on the perforating blade 7, the perforating blade 7 is restricted from moving in the lateral direction with the abutting plate 21 and the blade clamping piece 30 as a guide, and during perforation. Since bending to the side, particularly the shaft side, is prevented, the piercing blade 7 can be held at a fixed position to increase the dimensional accuracy of the through-hole 52, and breakage of the piercing blade 7 can be prevented.

  In addition, the contact plate 21 of each of the above embodiments is formed of a single plate material and connected to the pair of punching blades 7 to connect the drilling blades 7 to each other. However, the present invention is not limited to this, and the contact plate 21 may be attached to each of the perforating blades 7 individually. However, if the contact plate 21 is formed of a single plate and connects the drilling blade 7, the drilling blade 7 can be held more firmly in a fixed position.

  The inner surface abutting portion provided on the abutting plate 21 is formed by the arc-shaped abutting flange 23. However, the present invention is not limited to this. The shape may be erected, and the form is not limited.

  Further, in each of the above embodiments, the contact flange 23 as the inner surface contact portion of the claims and the contact piece 24 as the peripheral contact portion of the claims are provided on the contact plate 21 which is separate from the punching tool body 2. However, the inner surface contact portion and the peripheral edge contact portion of the claims may be provided integrally with the punching tool main body 2.

  In addition, in the above-described embodiment, the present invention is applied to a drilling tool in which a pair of drilling blades 7 are provided. However, the present invention is not limited to this, and three or more drilling blades 7 may be provided and applied to this drilling tool. it can.

It is a perspective view which shows the punching tool of the Example of this invention. It is a partially broken front view of the punching tool of FIG. It is a side view of the piercing tool of FIG. It is a bottom view of the punching tool of FIG. FIG. 5 is an explanatory diagram showing a positional relationship of a contact flange in a cutting groove cut by the drilling blade of FIG. 4. It is a partially broken front view of the shank shaft of FIG. It is a longitudinal cross-sectional view of the center axis | shaft of FIG. It is a perspective view of the contact plate of FIG. It is a front view of the contact plate of FIG. It is a front view which shows the conventional punch. It is a front view which shows the superposition | polymerization hole drilled in a wall material. It is a front view which shows another conventional punch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Punching tool 2 Punching tool main body 4 Center shaft 7 Punching blade 21 Contacting plate 22 Mounting flange 23 Contacting flange 24 Contacting piece 29 Weld nut 30 Blade clamping piece 31 Screw 51 Wall material 52 Through-hole 52a Inner surface S Cutting groove

Claims (10)

A drilling tool that rotates about a center axis, and is provided with a plurality of independently projecting drilling blades that are independently detachable, and that drills a through hole in a drilled body,
Inserted into the cutting groove of the drilled body cut by the drilling blade during drilling,
The inner surface abutting portion separate from the perforation blade that can abut against the inner surface of the through-hole and prevent the perforation blade from colliding with the inner surface of the through-hole when the drilled body is penetrated is cut by the perforation blade. A drilling tool characterized in that it is erected in the protruding direction of the drilling blade with the same curvature radius as the cutting groove. A drilling tool that rotates about a center axis, and is provided with a plurality of independently projecting drilling blades that are independently detachable, and that drills a through hole in a drilled body,
Inserted into the cutting groove of the drilled body cut by the drilling blade during drilling,
The inner surface abutting portion separate from the perforation blade that can abut against the inner surface of the through-hole and prevent the perforation blade from colliding with the inner surface of the through-hole when the drilled body is penetrated is cut by the perforation blade. Standing in the protruding direction of the drilling blade with the same radius of curvature as the cutting groove
A perforating tool comprising a peripheral abutting portion that abuts a peripheral edge of a through hole of the drilled body to prevent the punching blade from being pushed into the drilled body beyond a certain level.   At least one of the inner surface contact portion and the peripheral contact portion is provided in a separate contact portion forming body attached to the punching blade or the punching tool main body, and the contact portion forming body includes the center shaft. The drilling tool according to claim 1, wherein the drilling tool is attached so as to be adjustable in a longitudinal direction.   At least one of the inner surface contact portion and the peripheral edge contact portion is provided in a separate contact portion forming body attached to the punching blade or the punching tool body, and the contact portion forming body includes the punching blade. The punching device according to any one of claims 1 to 3, further comprising a holding portion that holds the pin and prevents its tilting.   The said contact part formation body was provided with the clamping part which clamps the said drilling blade, The punching tool of Claim 3 or Claim 4 characterized by the above-mentioned.   The punching tool according to any one of claims 3 to 5, wherein the plurality of punching blades are connected to each other by one contact portion forming body.   The punching device according to any one of claims 3 to 6, wherein the contact portion forming body is formed of a metal plate through which the center shaft passes.   The center shaft is urged so as to be able to advance and retreat, and is retracted without penetrating the drilled body by being pressed by the drilled body in a state where the center shaft is positioned on the drilled body. The punch according to any one of claims 1 to 7. Rotating about the center axis of the piercing tool , each being independently detachably provided, and independently attached to a plurality of piercing piercing blades or piercing tool bodies that are adjustably mounted , and at the time of piercing It is inserted into the cutting groove of the drilled body cut by the drilling blade and prevents the drilling blade from colliding with the inner surface of the through hole by contacting the inner surface of the through hole when passing through the drilled body. An abutting portion forming body for a piercing tool, wherein an inner surface abutting portion separate from the obtained piercing blade is erected in the protruding direction of the piercing blade with the same curvature radius as a cutting groove cut by the piercing blade. Rotating about the center axis of the drilling tool , each of which is independently attached and detachably mounted on a plurality of independently projecting drilling blades or the drilling tool body, and can be freely adjusted in position. A plurality of independently projecting piercing blades or piercing tool bodies provided on the pierced tool body and a plurality of independently projecting piercing blades or piercing tool bodies are attached to the plurality of independently projecting piercing blades or piercing tool bodies so as to be axially adjustable and drilled It is sometimes inserted into the cutting groove of the drilled body cut by the drilling blade, and abuts against the inner surface of the through-hole when penetrating the drilled body so that the drilling blade collides with the inner surface of the through-hole. The inner surface abutting part separate from the drilling blade that can be prevented is erected in the protruding direction of the drilling blade with the same curvature radius as the cutting groove cut by the drilling blade,
An abutting portion forming body for a piercing tool, comprising a rim abutting portion that abuts against a perimeter of a through hole of the perforated body to prevent the perforating blade from being pushed into the perforated body beyond a certain level. .

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