JP2005066778A - Cylindrical boring tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical boring tool capable of efficiently boring a workpiece formed of a relatively soft material. <P>SOLUTION: This cylindrical boring tool having a shank section and a cylindrical tool body having a cutting edge part at the tip edge is provided with a presser member provided in a relatively rotatable manner coaxially with the shank section or the cylindrical tool body, in a state of being energized in a tip direction by an elastic body, and having a predetermined outer diameter smaller than the inner diameter of the cutting edge part of the cylindrical tool body. Since the presser member is normally energized by the elastic body, at least the tip part of the presser member is projected in the tip direction from the cylindrical tool body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cylindrical drilling tool having a shank part and a cylindrical tool body having a cutting edge part at a tip edge thereof, and in particular, coaxially relative to the shank part and the like while being urged by an elastic body in the tip direction. The present invention relates to a cylindrical drilling tool further provided with a pressing member that is rotatably provided and has a predetermined outer diameter that is smaller than the inner diameter of the cutting edge portion of the cylindrical tool body.

Conventionally, there is a core drill as a tool for drilling a hole having a relatively large diameter with respect to a workpiece. As a conventional core drill, for example, as shown in FIG. 1, a cylindrical drill body 3 having a cutting edge portion 3b at the tip edge of a cylindrical portion 3a is connected to a rotary drive device (not shown). There is a core drill 1 in which the shank portion 2 is fitted and mounted so as to rotate coaxially and integrally. Here, as shown in FIG. 1, the core drill 1 is extendable in the axial direction on its central axis and is biased in the distal direction by a spring 6 to sharpen the center with respect to the workpiece 50. A central shaft member 8 including a central pin 7 having a portion 7c is further included (see, for example, Non-Patent Document 1).
Unika Co., Ltd., “PRODUCTS (core drill)”, [online], 2003, [Search June 25, 2003], Internet <URL: http://www.unika.co.jp/products/flame .html>

  However, as shown in FIG. 1, an interior material 51 such as a gypsum board as represented by a wall of a building, an intermediate material 52 as a heat insulating material (or soundproofing material) made of glass wool, rock wool or the like, and wood, sizing When processing a composite workpiece 50 in which an exterior material 53 such as a material is combined, the interior material 51 is made of a relatively hard material, so that it can be drilled by the core drill 1 as well. Etc. are fibrous, and during processing by the core drill 1, glass wool or the like wraps around the core drill 1 (particularly, the cutting edge portion 3 b) and becomes entangled.

  Therefore, conventionally, after drilling the interior material 51, the operator needs to use a cutter knife or the like as appropriate to cut out the intermediate material 52, or cut the intermediate material 52 to scrape glass wool or the like, Work efficiency is poor. Similarly, when the intermediate material 52 is a relatively soft material such as a synthetic resin sponge, the drilling process using the cylindrical drill body 3 is inefficient.

  A cylindrical drilling tool for solving the above-mentioned problems is provided with a shank portion (102) connected to a rotary drive device, and integrally or separately with respect to the shank portion so as to rotate integrally with the shank portion. In the cylindrical drilling tool (100) having a cylindrical tool body (103) having a cutting edge (103b) at the tip edge thereof, the shank is biased in the tip direction by the elastic body (106). The presser member (108, 111) is provided on the part or the cylindrical tool body so as to be relatively rotatable coaxially and has a predetermined outer diameter smaller than the inner diameter of the cutting edge part (103b) of the cylindrical tool body (103). Usually, when the pressing member is biased by the elastic body (106), the pressing member in which at least the distal end portion (111b) of the pressing member protrudes in the distal direction from the cylindrical tool body is further removed. Preparation When the workpiece (50) is processed, the pressing member (108, 111) resists the elastic body (106) when the pressing member contacts and presses against the workpiece. Alternatively, it moves relative to the cylindrical tool body from the cutting edge (103b) of the cylindrical tool body to a predetermined position in the direction of the shank, and while the cylindrical tool body is rotating, the holding member (108 , 111) is not rotated by the contact with the workpiece (50).

  Preferably, the pressing member (108, 111) is coaxially attached to the shank portion (102) or the cylindrical tool body (103) in a state of being biased in the distal direction by the elastic body (106). A shaft member (108: 104, 105, 106, 107) and a contact pressing member (111) provided coaxially at the tip of the central shaft member so as to be integrally or separately rotatable, The contact pressing member in which at least the distal end portion (111b) of the contact pressing member protrudes in the distal direction from the cylindrical tool body when the central shaft member (107) is biased by the elastic body (106). When the workpiece (50) is machined, the center pressing member (107) and the contact pressing member (111) are made elastic by the contact pressing member being pressed against the workpiece. (1 6) against the shank part or the cylindrical tool body against the shank part or the cylindrical tool body, the cylindrical tool body moves from the cutting edge part (103b) to a predetermined position in the shank part direction. During the rotation, the contact pressing member (111) does not rotate due to the contact with the workpiece (50).

  Further preferably, the contact pressing member (111) is provided so as to be relatively movable in the axial direction with respect to the central shaft member (107) and biased in the distal direction by the elastic body (106). It is characterized by that.

Preferably, the predetermined outer diameter of the pressing member (108, 111) is substantially equal to the inner diameter of the cutting edge (103b) of the cylindrical tool body (103).
Preferably, a portion of the pressing member (108, 111) that contacts the workpiece (50) is provided with a recess.

Preferably, a portion of the pressing member (108, 111) that contacts the workpiece (50) is substantially cylindrical (111b).
Preferably, a portion of the pressing member (108, 111) that contacts the workpiece (50) has a plurality of protrusions (111c) on the contact surface.

Preferably, a part or all of the pressing member (108, 111) is transparent or translucent.
Preferably, the pressing member (108, 111) has a sharp head (107c) that protrudes in the distal direction from the cylindrical tool body (103).

  A cylindrical drilling tool for solving the above-mentioned problems is provided with a shank portion (102) connected to a rotary drive device, and integrally or separately with respect to the shank portion so as to rotate integrally with the shank portion. And a cylindrical tool body (103) having a cutting edge (103b) at the tip edge thereof, and a relatively soft first workpiece (52) and a relatively hard second workpiece (53). ) In the cylindrical drilling tool (100) for processing the composite workpiece (50) combined with the shank portion or the cylindrical tool body while being urged by the elastic body (106) in the distal direction. Presser members (108, 111) which are provided so as to be relatively rotatable and have a predetermined outer diameter smaller than the inner diameter of the cutting edge portion (103b) of the cylindrical tool body (103). Energized by elastic body (106) Thus, in the case of further processing the composite workpiece (50), further comprising the presser member in which at least the tip end portion (111b) of the presser member protrudes in the tip end direction from the cylindrical tool body, the presser member (111: 111b) contacts and presses against the first workpiece (52), and while the cylindrical tool body is rotating, the first workpiece is contracted and the presser member ( 108, 111) is in contact with the first workpiece and does not rotate, and the first workpiece (52) is machined by the cutting edge (103b) of the cylindrical tool body. After the completion of the processing of the first workpiece, the front end portion of the pressing member (108, 111) is substantially contacted and pressed against the second workpiece (53), and the pressing member (108, 111). Against the elastic body (106) against the shank portion or the cylindrical tool body. The second work piece is moved relative to the predetermined position in the shank portion direction from the cutting edge portion (103b) of the cylindrical tool body, and is moved by the cutting edge portion (103b) of the cylindrical tool body. (53) is processed.

  A cylindrical drilling tool for solving the above-mentioned problems includes a shank portion (202; 302) connected to a rotary drive device, and an integral or separate body with respect to the shank portion so as to rotate integrally with the shank portion. A cylindrical tool body (203; 303) having a cutting edge (203b; 303b) at the tip edge thereof, and is coaxially attached to the shank or cylindrical tool body (203; 303), In a cylindrical drilling tool (200; 300) having a central shaft drilling member (265, 266; 365, 366) that rotates integrally with the shank portion, the central shaft drilling member (265, 266; 365, 366) is used. A contact pressing member (268; 368) that is fitted and fitted so as to be axially movable relative to the central shaft piercing member and coaxially rotatable, and is usually an elastic body ( 64; 364), and the contact pressing member (268; 368) in which at least the distal end portion (268b; 368b) of the contact pressing member protrudes from the cylindrical tool body in the distal direction is provided. When the workpiece (50) is processed, the contact pressing member (268; 368) resists the elastic body (264; 364) by the contact pressing member pressing against the workpiece. Moving relative to the shank part or the cylindrical tool body from the cutting edge part (203b; 303b) of the cylindrical tool body to a predetermined position in the direction of the shank, and the cylindrical tool body is rotating. The contact pressing member (268; 368) is not rotated by the contact with the workpiece (50).

  Preferably, a first ring (263a; 381a) fitably attached to the central shaft piercing member (265, 266; 365, 366) and coaxially and relative to the first ring. And a rotation non-transmission mechanism (263; 381) provided with a second ring (262, 263b; 381b) that is freely provided and to which the elastic body (264; 364) is pressed. When processing (50), the first ring (263a; 381a) is rotated integrally with the shank portion (202; 302) or the cylindrical tool body (203; 303). The rings (262, 263b; 381b) are not rotated in conjunction with the rotation of the shank (202; 302) or the cylindrical tool body (203; 303).

  Preferably, a third ring (267a) is fitted to the contact pressing member (268) so as to be axially integrated and coaxially rotatable relative to the contact pressing member (268). 266) is fitted so as to be relatively movable in the axial direction and relatively rotatable coaxially, and the tip shoulder of the central shaft piercing member (265, 266) is biased by the elastic body (264). When the workpiece (50) is further processed, the rotational force of the central shaft piercing member (265, 266) is increased by the third ring (267a) contacting the portion (266b). It is not transmitted to the contact pressing member (268) due to the presence.

  According to the cylindrical drilling tool of the present invention, it is provided on the shank part or the cylindrical tool body so as to be relatively rotatable coaxially with the elastic body being urged in the distal direction, and the cutting edge part of the cylindrical tool body. A presser member having a predetermined outer diameter that is smaller than the inner diameter, and usually the presser member is urged by an elastic body so that at least the presser member protrudes from the cylindrical tool body in the front end direction. In addition, when processing a workpiece, the presser member moves to a predetermined position against the elastic body when the presser member contacts and presses against the workpiece, and the cylindrical tool body is rotating. Since the pressing member does not rotate due to contact with the workpiece, the following advantage is obtained.

(1) Since it is made of a relatively soft material, it is possible to drill a workpiece that cannot be drilled with a conventional cylindrical drilling tool.
(2) Since the pressing member includes a predetermined center shaft member biased in the distal direction by an elastic body and a contact pressing member, a cylinder for punching a workpiece made of a relatively soft material with a simple structure. A shape drilling tool may be provided. For example, a desired cylindrical drilling tool can be provided by attaching a contact pressing member to the tip of the center pin of a conventional cylindrical drilling tool in a rotatable and coaxial manner.

  (3) Since the contact pressing member is attached while being slidable in the axial direction with respect to the central shaft member and biased in the distal direction by the elastic body, a relatively large pressing force is desired on the workpiece. Even if it is a case, a desired cylindrical drilling tool can be provided by improvement of the conventional cylindrical drilling tool.

  (4) Since the predetermined outer diameter of the holding member is substantially equal to the inner diameter of the cutting edge portion of the cylindrical tool body, the vicinity of the portion where the cutting edge of the cylindrical tool body contacts the workpiece is pressed to It is possible to effectively prevent the cutting edge of the tool body from being entangled with the workpiece.

  (5) Since the portion of the presser member that comes into contact with the workpiece is provided with a recess, the pressure (force per unit area) that presses the workpiece is increased, and the cutting edge of the cylindrical tool body is processed. It is possible to effectively prevent tangling to an object.

(6) Since the portion of the pressing member that contacts the workpiece is substantially cylindrical, it is possible to more effectively prevent the cutting blade of the cylindrical tool body from being entangled with the workpiece.
(7) Since the contact surface of the portion of the presser member that contacts the workpiece has a plurality of protrusions, the presser member can be easily locked to the workpiece, and the presser member is effective against the workpiece. Can be relatively stationary.

(8) Since part or all of the pressing member is transparent or translucent, the pressing member does not hinder the operator's field of view when the center of the cylindrical drilling tool is aligned with the workpiece.
(9) Since the holding member usually has a sharp head protruding in the tip direction from the cylindrical tool body, the center of the cylindrical drilling tool can be easily aligned with the workpiece.

(10) The cylindrical drilling tool according to the present invention can also be applied to a case where a composite workpiece in which a relatively soft first workpiece and a relatively hard second workpiece are combined is processed.
(11) According to the cylindrical drilling tool of the present invention, the cylindrical drilling tool has a predetermined shank portion, a cylindrical tool main body, and a central shaft drilling member, and is fitted to the central shaft drilling member in a fitting manner. A contact pressing member that is relatively movable in the axial direction relative to the shaft perforating member and is relatively rotatable coaxially, and is normally biased by an elastic body so that at least the tip of the contact pressing member is cylindrical. A contact pressing member projecting from the tool body toward the distal end, and when processing a workpiece, the contact pressing member is pressed against the workpiece so that the contact pressing member resists the elastic body. Since it moves to a predetermined position and the contact pressing member does not rotate due to contact with the workpiece while the cylindrical tool body is rotating, the following advantages are obtained.

Since it is made of a relatively soft material, it is possible to drill a workpiece that has been impossible to drill with a conventional cylindrical drilling tool.
In addition, when cutting progresses using a cylindrical drilling tool, the central shaft drilling member can function as a guide.

          Furthermore, after drilling the workpiece from one direction (inner side) to midway, centering with the central axis drilling member from the other direction (outer side), and completing the drilling of the workpiece using the central axis drilling member as a guide Thus, cracks and the like generated on the outside of the workpiece can be prevented, and the finish viewed from the other direction can be improved.

  (12) The cylindrical drilling tool according to the present invention further includes a predetermined non-rotating transmission mechanism including a first ring attached to the central shaft drilling member and a second ring against which the elastic body is contacted and pressed. When processing the workpiece, the first ring is rotated integrally with the shank portion etc., but the second ring is not rotated in conjunction with the rotation of the shank portion etc., so that the cylindrical tool body is rotating. The elastic body does not rotate, and it can be more smoothly realized that the contact pressing member does not rotate due to contact with the workpiece.

(13) The cylindrical drilling tool according to the present invention further includes a predetermined third ring fitted so as to be axially movable relative to the central shaft drilling member and coaxially rotatable. When the workpiece is processed, the rotational force of the central shaft drilling member is not transmitted to the contact pressing member due to the presence of the third ring, so that the contact pressing member and the workpiece are rotated during the rotation of the cylindrical tool body. It can be realized more smoothly that it does not rotate due to the contact of. In addition, when the cylindrical drilling tool does not include the third ring and the contact pressing member is directly fitted to the central shaft drilling member, the contact pressing is performed when the central shaft drilling member rotates. Although the member and the central shaft drilling member may come into contact with each other to generate abnormal noise and frictional heat, the cylindrical drilling tool according to the present invention can prevent the generation of these abnormal noise and frictional heat.
[Best Mode for Carrying Out the Invention]

A cylindrical drilling tool according to the present invention will be described with reference to FIGS.
In FIG. 2, a core drill 100 as a cylindrical drilling tool is roughly fitted coaxially with a cylindrical drill body 103 as a cylindrical tool body with a shank portion 102 connected to a rotation drive device (not shown). In addition to mounting, the cylindrical drill body 103 and the shank portion 102 are locked and fixed to each other in a rotational direction by a predetermined locking means (not shown) so as to be integrally rotatable. The cylindrical drill body 103 may be provided integrally with the shank portion 102.

  As in the workpiece 50 in FIG. 1, the composite workpiece 50 is an intermediate made of a relatively soft material such as an interior material 51 such as gypsum board, glass wool, rock wool, or sponge as the first workpiece. This is a combination of a material 52 (such as a heat insulating material or a soundproofing material) and an exterior material 53 made of a relatively hard material such as wood or sizing material as the second workpiece.

  The shank portion 102 is generally composed of a connecting portion 102a and a columnar support portion 102b having a predetermined shape so as to be connected to a rotation drive device (not shown). As shown in FIG. 2, the columnar support portion 102b is provided with a support hole 102c extending on the rotation axis. The support portion 102b is provided with a reduced diameter portion 102e provided with a groove 102f for the annular stopper member 109 at the edge opposite to the connecting portion 102a.

  The cylindrical drill main body 103 is provided with a cutting edge portion 103b made of diamond grains brazed to the leading edge of a cylindrical portion 103a made of a material that provides desired strength such as hardened steel. A groove 103c for the annular locking member 109 is provided inside the vicinity of the rear end (that is, the shank portion side) of the cylindrical portion 103a. The shank portion 102 is coaxially fitted and attached to the cylindrical drill body 103 via an annular stopper member 109. Here, since the cylindrical drill main body 103 and the shank part 102 are mutually locked and fixed in the rotation direction by a predetermined locking means (not shown), they can rotate together. The material of the cutting edge portion 103b may be, for example, a cemented carbide that provides desired strength and hardness, and can be appropriately changed according to the material of the workpiece 50.

  The pressing members (108, 111) generally include a columnar support shaft member 104, a cylindrical member 105, a spring 106 as an elastic body, a center shaft member 108 including a center pin 107, and a pressing plate 111 as a contact pressing member. Prepare.

  The columnar shaft member 104 has a small-diameter portion 104d provided with a male screw portion 104a and a groove 104e for an O-ring 110 (for example, made of an elastic material such as rubber), and is larger than the outer diameter of the small-diameter portion 104d. A large diameter portion 104b having an outer diameter and defining a shoulder portion 104c. The cylindrical member 105 includes a spring that can include a female screw part 105b that can be screwed with the male screw part 104a of the columnar support shaft member 104 and a spring 106 in order from the rear end side to the front end side inside the cylindrical main body part 105a. The front end side opening portion 105d having an inner diameter smaller than the inner diameter of the portion 105c and the spring inclusion portion 105c is provided. The center pin 107 includes a columnar main body 107a having an outer diameter substantially equal to the inner diameter of the distal end side opening 105d of the cylindrical member 105, a large diameter portion 107b fitted into the spring containing portion 105c of the cylindrical member 105, and the distal end thereof. Sharp head 107c, and C-ring grooves 107e and 107f provided near the tip of the sharp head 107c and spaced apart from each other by a predetermined distance. The center pin 107 may not have the sharp head 107c.

  As shown in FIG. 2, the center shaft member 108 is obtained by sequentially inserting a center pin 107 and a spring 106 into a cylindrical member 105 and then screwing and assembling the columnar support shaft member 104. Accordingly, the center pin 107 is movable relative to the cylindrical member 105 in the axial direction. However, the center pin 107 is normally urged by the spring 106 in the distal direction (hereinafter referred to as “downward direction” in the drawing) to increase its diameter. The portion 107 b comes into contact with the small diameter portion at the lower end of the cylindrical portion 105, and the sharp head 107 c protrudes downward from the cylindrical drill body 103.

  The center shaft member 108 is attached to the shank portion 102 by inserting the small diameter portion 104 d of the columnar support shaft member 104 into the support hole 102 c of the shank portion 102 via the O-ring 110. The central shaft member 108 does not have the spring 106, a spring (not shown) is inserted into the support hole 102c, and the central shaft member 108 is loosely inserted into the support hole 102c, so that the central shaft member 108 is The tip of the central shaft member 108 may protrude downward from the cylindrical drill body 103 by being biased by the spring. The central shaft member 108 may be coaxially and rotatably mounted on the cylindrical drill body 103.

  The pressing plate 111 is made of a material such as aluminum or plastic for weight reduction, and the outer diameter of the pressing plate 111 is on the peripheral edge of the disk-shaped member 111a substantially equal to the inner diameter of the cutting blade 103b of the cylindrical drill body 103, and on the lower surface. A cylindrical portion 111b having a plurality of protrusions 111c (see FIG. 3) is provided. The pressing plate 111 may be made of a transparent or translucent material such as acrylic resin. Here, when the pressing plate 111 contacts the intermediate material 52 made of a relatively soft material, the pressing plate 111 contacts and presses the intermediate material 52 on the lower surface of the cylindrical portion 111b. Thereby, the force with which the pressing plate 111 presses the intermediate member 52 is concentrated on the contact surface of the cylindrical portion 111b, and a large pressure (the pressing force per unit area) for the pressing plate 111 to press the intermediate member 52 is generated. can get. The disk-shaped member 111a has a through hole 111d through which the main body 107a of the center pin 107 is inserted.

Note that the protrusion 111c on the lower surface of the cylindrical portion 111b may not be provided. Furthermore, the cylindrical portion 111b of the pressing plate 111 may have a rectangular tube shape or other shapes.
The pressing plate 111 is fitted to the center pin 107 so as to be relatively rotatable, and is fixed in the axial direction by C-rings 112 and 113 via spacers 114 and 115 on both sides thereof. Here, since the center pin 107 to which the pressing plate 111 is attached is normally biased downward by the spring 106, the pressing plate 111 has a lower surface of the cylindrical portion 111 b, which is a tip portion thereof, below the cylindrical drill body 103. Protrude in the direction. When the pressing plate 111 is in contact with the workpiece 50 while the cylindrical drill body 103 is rotating, the pressing plate 111 is relatively rotatable about the center pin 107, so that the pressing plate 111 is not moved toward the workpiece 50. Therefore, it does not rotate due to the frictional force caused by the contact. In the case of drilling only a relatively hard workpiece using the core drill 100, the pressing plate 111 may be appropriately removed from the center pin 107. Further, the pressing plate 111 may be provided so as to be movable relative to the center pin 107 in the axial direction and biased downward by an elastic body (not shown).

  When the pressing plate 111, the center pin 107, and the cylindrical main body portion 105a of the cylindrical member 105 are integrally rotated, the columnar support shaft member 104 of the center shaft member 108 is moved with respect to the support hole 102c of the shank portion 102. For example, the central shaft member 108 can be smoothly rotated with respect to the shank portion 102 by being fitted and mounted via a bearing (not shown), and the pressing plate 111 is covered while the cylindrical drill body 103 is rotating. When contacting the workpiece 50, the pressing plate 111 may be prevented from rotating with respect to the workpiece 50. On the other hand, by inserting a bearing (not shown) between the spring 106 and the center pin 107, the pressing plate 111 may be prevented from rotating with respect to the workpiece 50 as described above.

Next, the usage method of the core drill 100 is demonstrated.
In FIG. 2, the sharp head 107 c of the center pin 107 is positioned at the center previously recorded on the interior material 51 of the workpiece 50. At this time, when the pressing plate 111 is transparent or translucent, the centering can be performed without obstructing the field of view by the pressing plate 111.

  When drilling the workpiece 50, the core drill 100 first drills the interior material 51. As shown in FIG. 4, the sharp head 107 c of the center pin 107 is against the interior material 51 of the workpiece 50. The contact pin is pressed, and the center pin 107 and the pressing plate 111 reach a predetermined position in the shank portion direction from the cutting edge portion 103b of the cylindrical drill body 103 relative to the cylindrical drill body 103 against the spring 106. The cutting edge portion 103b of the cylindrical drill main body 103 is allowed to cut into the interior material 51 (see FIG. 4).

  After the drilling of the interior material 51 is completed, the core drill 100 drills the intermediate material 52 of the workpiece 50. However, the cut circular portion of the interior material 51 may fall off naturally or be removed by the operator. Although it is preferable, even if it remains, subsequent processing is possible.

  When drilling the intermediate material 52 of the workpiece 50, first, the rotation of the cylindrical drill body 103 is stopped, and the intermediate material 52 is contacted and pressed by the pressing plate 111 (note that the layer thickness of the intermediate material 52 is relatively high). If it is small, it is not always necessary to stop the rotation of the cylindrical drill body 103.) As shown in FIG. 5, the intermediate material 52 sandwiched between the pressing plate 111 and the exterior material 53 contracts and is substantially fixed to the exterior material 53 in the vicinity of the cutting edge portion 103 b of the cylindrical drill body 103. Then, the intermediate material 52 can be processed by the rotation of the cylindrical drill body 103 without the intermediate material 52 being entangled with the cutting edge portion 103b (see FIG. 6). Here, during the rotation of the cylindrical drill body 103, the pressing plate 111 does not rotate due to contact friction (a desired frictional force can be obtained by the presence of the protrusion 111c) with respect to the intermediate member 52.

  After completion of the drilling of the intermediate member 52, when the core drill 100 is positioned and the cylindrical drill body 103 is rotated by the sharp head 107c of the center pin 107 coming into contact with the exterior member 53 as shown in FIG. The resulting blur is prevented. As in the case of drilling the interior material 51 described above, the center pin 107 and the pressing plate 111 move gradually until reaching a predetermined position against the spring 106, and the cylindrical drill body 103 is cut into the exterior material 53. Allow progress (see FIG. 7).

  Of course, in the core drill 100, when there is a space between the interior material 51 and the intermediate material 52 of the workpiece 50 (both materials 51 and 52 are separated from each other), or the intermediate material 52 and the exterior of the workpiece 50. It can also be used when a space exists between the materials 53 (both materials 52 and 53 are separated from each other).

  In addition, the core drill 100 can, of course, drill only a relatively soft workpiece such as glass wool, and a second workpiece such as a relatively soft first material such as glass wool and relatively hard wood. It is possible to drill a composite workpiece that is a combination of workpieces.

  Furthermore, the cylindrical drilling tool of the present invention can of course be applied to other cylindrical drilling tools such as a hole saw for drilling metal or the like. When the cylindrical drilling tool of the present invention is a hole saw, this hole saw, for example, drills a composite workpiece in which a first workpiece such as a relatively soft glass wool and a second workpiece such as a metal are combined. Is possible.

A second embodiment of the cylindrical drilling tool according to the present invention will be described with reference to FIGS.
In FIG. 8, a core drill 200 as a cylindrical drilling tool is roughly a core drill 100 (see FIG. 2) according to the first embodiment of the present invention, instead of the central shaft member 108 of the core drill 100. A winding spring 264 as an elastic body provided with a center drill 265 and having a pressing plate 268 corresponding to the pressing plate 111 of the core drill 100 interposed between the pressing plate 268 and the shank 202 (of course, other springs may be used) Therefore, the same parts as those in FIG. 2 are denoted by the same reference numerals, the description thereof is omitted, and the corresponding members are shown in FIG. “200” is used instead of “100”. As shown in FIG. 8, the shank portion 202 is provided with a screw hole 202g extending in the radial direction from the outer surface thereof and penetrating through the support hole 202c.

  As shown in FIG. 8, the center drill 265 is provided with a spiral groove 265 b for chip evacuation from a predetermined position to one end (tip) of the rod-shaped member, and a recess 265 a in the vicinity of the other end (shank side end). It is provided. A drill cutting edge 266 made of a material that provides a desired strength and hardness, such as cemented carbide, is fixed to one end of the center drill 265. The outer diameter of the drill cutting edge 266 is larger than the outer diameter of the rod-shaped member of the center drill 265, thereby forming the tip shoulder 266b. Of course, the center drill 265 may not have the spiral groove 265b, and the drill cutting edge 266 may be provided integrally with the center drill 265.

  The center drill 265 is fitted into the support hole 202c of the shank portion 202, and a bolt 251 (or a potato screw) screwed into the screw hole 202g of the shank portion 202 abuts on the recess 265a of the center drill 265, thereby The drill 265 rotates integrally with the shank portion 202. The center drill 265 may be coaxially attached to the cylindrical drill main body 203 instead of the shank portion 202.

  A radial bearing 263 (hereinafter referred to as “upper bearing 263” as appropriate) serving as a rotational force non-transmission mechanism is an inner ring 263a as a first ring in a coaxially arranged ring shape (of course, a cylindrical shape). A steel ball 263c is disposed between the outer rings 263b as the second ring, and the outer ring 263b is a known one that is coaxial and relatively rotatable with respect to the inner ring 263a. The inner ring 263a is loosely attached to the center drill 265, and the outer ring 263b is fitted and fixed to a disc 262 having a predetermined outer diameter smaller than the inner diameter of the cylindrical drill body 203. The inner ring 263a may be fixedly fitted to the center drill 265.

  The pressing plate 268 as the contact pressing member is made of a material such as aluminum or plastic (transparent or translucent material such as acrylic resin may be used) like the pressing plate 111 of the core drill 100 (see FIGS. 2 and 3). The outer surface of the disk-shaped member 268a having an outer diameter slightly smaller than the inner diameter of the cutting blade portion 203b of the cylindrical drill body 203 and having a through hole 268d at the center thereof may have a plurality of protrusions on the lower surface as necessary. A cylindrical portion 268b having a portion 268c (not shown) is provided. The cylindrical portion 268b may have a rectangular tube shape or other shapes.

  The radial bearing 267 (hereinafter referred to as “lower bearing 267” as appropriate) is a known bearing in which a steel ball 267c is disposed between an inner ring 267a and an outer ring 267b as a third ring, as in the radial bearing 263. 267a is fitted to the center drill 265 so as to be relatively movable in the axial direction and coaxially rotatable, and the outer ring 267b is fitted into and fixed to the through hole 268d of the pressing plate 268. Therefore, when the center drill 265 rotates, the rotational force of the center drill 265 may be transmitted to the inner ring 267a of the lower bearing 267 by its contact friction to rotate it, but the function of the lower bearing 267 Therefore, it is not transmitted to the outer ring 267b.

  As shown in FIG. 8, between the pressing plate 268 and the front end side end surface (hereinafter referred to as “lower end surface”) 202 h of the shank portion 202, a spacer 261 and an upper bearing fitted into the disc 262 are sequentially inserted with respect to the center drill 265. 263, a winding spring 264, and a lower bearing 267 fitted in the pressing plate 268 are interposed. Therefore, the spacer 261 is pressed against the lower end surface 202 h of the shank portion 202 via the upper bearing 263 by the winding spring 264. The spacer 261 may be in pressure contact with the cylindrical drill body 203.

  Here, the lower end surface of the spacer 261 contacts the inner ring 263a of the upper bearing 263, but does not contact the outer ring 263b or the disc 262. One end of the winding spring 264 on the shank portion 202 side is in pressure contact with the disk 262 (or the outer ring 263b of the upper bearing 263), but not in contact with the inner ring 263a. Accordingly, the rotational force of the shank portion 202 (that is, the rotational force of the cylindrical drill body 203) is transmitted to the inner ring 263a of the upper bearing 263 but not to the outer ring 263b. It is not transmitted to the pressing plate 268 via H.264. Therefore, at this time, as described above, the pressing plate 268 does not transmit the rotational force of the cylindrical drill body 203 and the center drill 265 via the upper and lower bearings 263 and 267 and winds around the workpiece 50. Since it is pressed by the urging force of the spring 264, it is held in a non-rotating state by the contact pressing force with the workpiece 50. The lower end of the winding spring 264 is in press contact with the pressing plate 268 (or the outer ring 267b of the lower bearing 267), but not in contact with the inner ring 267a.

Since the pressing plate 268 is normally urged downward by the winding spring 264, the lower end surface of the cylindrical portion 268b, which is the lower end portion thereof, protrudes downward from the cylindrical drill body 203.
When the pressing plate 268 comes into contact with the workpiece 50 when the workpiece 50 is machined using the core drill 200, the center drill 265 progresses through the workpiece 50 downward in the drawing as shown in FIG. However, since the pressing plate 268 stops contacting the interior material 51, the pressing plate 268 relatively moves in the upward direction in the figure against the urging force of the winding spring 264 (see FIGS. 9, 11, and 12).

  Since the usage method of the core drill 200 is generally the same as the usage method of the core drill 100 described above, the description thereof is omitted with reference to the above description (see FIGS. 8 to 12). Here, holes drilled by the center drill 265 and the cylindrical drill main body 203 are indicated by reference numerals “50a” and “50b”, respectively. In particular, the center drill 265 functions as a guide when the cylindrical drill main body 203 advances through the workpiece 50. Further, chips generated during processing of the workpiece 50 escape outward from the upper portion of the hole 50a through the spiral groove 265b of the center drill 265 (see FIGS. 9 and 11).

  Further, as another usage method peculiar to the core drill 200, after drilling (50a, 50b) from the upper part of the workpiece 50 (exterior material 53) to the middle of the external material 53 (see FIG. 12), FIG. As shown in the drawing, the center drill 265 is inserted into the through-hole 50a previously drilled from the lower side of the workpiece 50 (exterior material 53) in the figure and centered, and the drilling is completed using the center drill 265 as a guide. Can do. According to this method of use, the finish outside the hole 50b of the workpiece 50 (exterior material 53) can be made more beautiful. That is, when the workpiece 50 is drilled all at once from the inside, burrs, cracks, peeling, etc. occur around the outer edge of the through hole 50b of the exterior material 53 at the final stage of the drilling process, and the workpiece 50 (exterior The problem that the finish of the outer side of the hole 50b of the material 53) may deteriorate may occur, but according to this method of use, the above problem can be solved.

The upper and lower bearings 263 and 267 may be mechanisms other than ball bearings, such as journal bearings and roller bearings, that do not transmit rotational force.
Further, the inner ring 263a of the upper bearing 263 may directly contact the shank portion 202 or the cylindrical drill body 203 without the spacer 261 interposed therebetween.

  Further, the core drill 200 is fitted in such a manner that the pressing plate 268 is directly movable relative to the center drill 265 in the axial direction and coaxially rotatable without providing the lower bearing 267. Also good.

A third embodiment of the cylindrical drilling tool according to the present invention will be described with reference to FIG.
In FIG. 14, a core drill 300 as a cylindrical drilling tool is generally the same as the core drill 200 (see FIG. 8) according to the second embodiment of the present invention, and the same reference numerals are given to the same parts as in FIG. The description thereof is omitted, and corresponding members are indicated by using “300” instead of “200” in FIG. The core drill 300 is a thrust bearing 381 in place of the radial bearing 263, the spacer 261, and the disk 262 of the core drill 200 (in FIG. 14, the bearing 381 is a roller bearing and has a central through hole arranged coaxially. A roller 381c is arranged between an upper ring 381a as a first ring and a lower ring 381b as a second ring, and the lower ring 381b is an upper ring. 381a, and can be moved relative to the center drill 365 in the axial direction without providing a radial bearing corresponding to the lower bearing 267 of the core drill 200. In addition, it is fitted in such a manner that it can rotate relative to the same axis. Here, since the pressing plate 368 contacts the tip shoulder 366b of the drill cutting edge 366 via the spacer 382, the pressing plate 368 is not damaged by the rotation of the shoulder 366b.

Since the usage method of the core drill 300 is almost the same as the usage method of the core drill 200 described above (see FIGS. 8 to 13), the description thereof will be omitted with the aid of the above description.
Of course, the thrust bearing 381 may be a mechanism that does not transmit a rotational force, such as a journal bearing or a ball bearing, instead of a roller bearing.

It is a longitudinal cross-sectional view of the conventional cylindrical drilling tool. It is a longitudinal cross-sectional view of the cylindrical drilling tool for demonstrating the 1st Example of this invention. (Example 1) It is the figure which expanded the lower surface part of the contact pressing member of the cylindrical drilling tool in FIG. (Example 1) It is a longitudinal cross-sectional view for showing the state in which the cylindrical drilling tool in FIG. 2 drills an interior material. (Example 1) FIG. 3 is a longitudinal sectional view for illustrating a state in which the cylindrical drilling tool in FIG. 2 starts drilling the intermediate material. (Example 1) It is a longitudinal cross-sectional view for showing the state which the cylindrical drilling tool in FIG. 2 completed the drilling process of the intermediate material. (Example 1) It is a longitudinal cross-sectional view for showing the state in which the cylindrical drilling tool in FIG. 2 drills an exterior material. (Example 1) It is a longitudinal cross-sectional view of the cylindrical drilling tool for demonstrating the 2nd Example of this invention. (Example 2) It is a longitudinal cross-sectional view for showing the state in which the cylindrical drilling tool in FIG. 8 drills an interior material. (Example 2) FIG. 9 is a longitudinal sectional view for illustrating a state in which the cylindrical drilling tool in FIG. 8 starts drilling the intermediate material. (Example 2) It is a longitudinal cross-sectional view for showing the state which the cylindrical drilling tool in FIG. 8 completed the drilling process of the intermediate material. (Example 2) It is a longitudinal cross-sectional view for showing the state which the cylindrical drilling tool in FIG. 8 drills an exterior material from the inner side. (Example 2) It is a longitudinal cross-sectional view for showing the state in which the cylindrical drilling tool in FIG. 8 drills the exterior material from the outside. (Example 2) It is a longitudinal cross-sectional view of the cylindrical drilling tool for demonstrating the 3rd Example of this invention. Example 3

Explanation of symbols

1,100,200,300 Cylindrical drilling tool 2,102,202,302 Shank 3,103,203,303 Tubular tool body 108 Pressing member 111,268,368 Press plate

Claims (13)

A shank portion (102) connected to the rotation driving device and a shank portion that is integrally or separately provided with the shank portion so as to rotate integrally with the shank portion, and has a cutting edge portion (103b) at the tip edge thereof In the cylindrical drilling tool (100) having the cylindrical tool body (103),
A state in which the elastic body (106) is biased in the distal direction is coaxially and relatively rotatably provided on the shank part or the cylindrical tool body, and the cutting edge part (103b) of the cylindrical tool body (103) is provided. A presser member (108, 111) having a predetermined outer diameter smaller than the inner diameter, and normally, when the presser member is urged by the elastic body (106), at least the distal end portion (111b) of the presser member is The presser member further protruding in the distal direction from the cylindrical tool body,
When processing the workpiece (50), the pressing member is pressed against the workpiece so that the pressing member (108, 111) resists the elastic body (106) or the shank portion or It moves relative to the cylindrical tool body from the cutting edge (103b) of the cylindrical tool body to a predetermined position in the direction of the shank, and the presser member (108, 111) does not rotate due to said contact with the workpiece (50),
A cylindrical drilling tool characterized by that. In the cylindrical drilling tool according to claim 1,
The presser members (108, 111) are coaxially attached to the shank portion (102) or the cylindrical tool body (103) while being urged in the distal direction by the elastic body (106). 108: 104,105,106,107), and a contact pressing member (111) provided coaxially at the tip end portion of the central shaft member so as to be rotatable integrally or separately. When the shaft member (107) is urged by the elastic body (106), at least the distal end portion (111b) of the contact pressing member projects from the cylindrical tool body in the distal direction. ,
When the workpiece (50) is processed, the center pressing member (107) and the contact pressing member (111) are brought into contact with the elastic body (106) by the contact pressing member pressing against the workpiece. Accordingly, the cylindrical tool body moves relative to the shank part or the cylindrical tool body from the cutting edge part (103b) of the cylindrical tool body to a predetermined position in the shank part direction, and the cylindrical tool body is rotating. The cylindrical punching tool is characterized in that the contact pressing member (111) does not rotate by the contact with the workpiece (50). In the cylindrical drilling tool according to claim 2,
The contact pressing member (111) is relatively movable in the axial direction with respect to the central shaft member (107), and is provided in a state of being biased in the distal direction by an elastic body (106). A cylindrical drilling tool. In the cylindrical drilling tool according to any one of claims 1 to 3,
The cylindrical drilling tool characterized in that the predetermined outer diameter of the pressing member (108, 111) is substantially equal to the inner diameter of the cutting edge (103b) of the cylindrical tool body (103). In the cylindrical drilling tool according to any one of claims 1 to 4,
A cylindrical drilling tool characterized in that a concave portion is provided in a portion of the presser member (108, 111) that contacts the workpiece (50). In the cylindrical drilling tool according to any one of claims 1 to 4,
A portion of the pressing member (108, 111) that comes into contact with the workpiece (50) has a substantially cylindrical shape (111b). In the cylindrical drilling tool according to any one of claims 1 to 6,
A portion of the presser member (108, 111) that contacts the work piece (50) has a plurality of protrusions (111c) on the contact surface thereof. In the cylindrical drilling tool according to any one of claims 1 to 7,
A cylindrical drilling tool characterized in that a part or all of the pressing member (108, 111) is transparent or translucent. In the cylindrical drilling tool according to any one of claims 1 to 8,
The cylindrical drilling tool characterized in that the pressing member (108, 111) has a sharp head (107c) that protrudes in the distal direction from the cylindrical tool body (103). A shank portion (102) connected to the rotation driving device and a shank portion that is integrally or separately provided with the shank portion so as to rotate integrally with the shank portion, and has a cutting edge portion (103b) at the tip edge thereof A composite work piece (50) having a cylindrical tool body (103) and a combination of a relatively soft first work piece (52) and a relatively hard second work piece (53). In the cylindrical drilling tool (100) to
A state in which the elastic body (106) is biased in the distal direction is coaxially and relatively rotatably provided on the shank part or the cylindrical tool body, and the cutting edge part (103b) of the cylindrical tool body (103) is provided. A presser member (108, 111) having a predetermined outer diameter smaller than the inner diameter, and normally, when the presser member is urged by the elastic body (106), at least the distal end portion (111b) of the presser member is The presser member further protruding in the distal direction from the cylindrical tool body,
When processing the composite workpiece (50), the pressing member (111: 111b) is in contact with and pressed against the first workpiece (52), and the cylindrical tool body is rotated during the rotation. The cutting edge portion (103b) of the cylindrical tool body in a state where the first workpiece is contracted and the pressing member (108, 111) is not in contact with the first workpiece and does not rotate. ) To process the first workpiece (52),
After the completion of the processing of the first workpiece, the front end portion of the pressing member (108, 111) is substantially contacted and pressed against the second workpiece (53), and the pressing member (108, 111) Moves from the cutting edge (103b) of the cylindrical tool body to a predetermined position in the shank part direction relative to the shank part or the cylindrical tool body against the elastic body (106), Machining the second workpiece (53) with the cutting edge (103b) of the cylindrical tool body,
A cylindrical drilling tool characterized by that. A shank portion (202; 302) connected to the rotation driving device and a shank portion that is integrally or separately provided with the shank portion so as to rotate integrally with the shank portion, and a cutting edge portion (203b; 303b) a cylindrical tool body (203; 303), and a central shaft drilling member (265, 266) that is coaxially attached to the shank or cylindrical tool body (203; 303) and rotates integrally with the shank. 365, 366) in a cylindrical drilling tool (200; 300)
A contact pressing member that is fitted to the central shaft perforating member (265, 266; 365, 366) and is relatively movable in the axial direction and coaxially relative to the central shaft perforating member. (268; 368), which is normally biased by the elastic body (264; 364), so that at least the tip (268b; 368b) of the contact pressing member protrudes from the cylindrical tool body in the tip direction. The contact pressing member (268; 368),
When processing the workpiece (50), the contact pressing member (268; 368) opposes the elastic body (264; 364) by the contact pressing member pressing against the workpiece. It moves from the cutting edge part (203b; 303b) of the cylindrical tool body to a predetermined position in the shank part direction relative to the shank part or the cylindrical tool body, and during rotation of the cylindrical tool body, The cylindrical punching tool, wherein the contact pressing member (268; 368) does not rotate by the contact with the workpiece (50). The cylindrical drilling tool (200; 300) according to claim 11,
A first ring (263a; 381a) fitted to the central shaft piercing member (265, 266; 365, 366), and coaxially and relatively rotatable with respect to the first ring; And a rotational force non-transmission mechanism (263; 381) comprising a second ring (262, 263b; 381b) to which the elastic body (264; 364) is pressed and contacted,
When processing the workpiece (50), the first ring (263a; 381a) is rotated integrally with the shank portion (202; 302) or the cylindrical tool body (203; 303). A cylindrical drilling tool characterized in that the second ring (262, 263b; 381b) is not rotated in conjunction with the rotation of the shank portion (202; 302) or the cylindrical tool body (203; 303). In the cylindrical drilling tool (200) according to claim 11 or 12,
A third ring (267a) fitted to the contact pressing member (268) in an axially integral and coaxial manner so as to be relatively rotatable, with respect to the central shaft perforating members (265, 266) Are fitted so that they can move relative to each other in the axial direction and can rotate relative to each other in the axial direction. And further comprising the third ring (267a) contacting the
When processing the workpiece (50), the rotational force of the central shaft drilling member (265, 266) is not transmitted to the contact pressing member (268) due to the presence of the third ring. Drilling tool.

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