JP2017226038A - Hall saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hall saw for recovering a sample without damaging and while preventing the fall.SOLUTION: A hall saw comprises: a cutting member 2 formed into a cylindrical shape having a cutting blade 2A at the leading end and capable of accommodating such a sample, which is an object to be processed, in a cylinder as is turned on a cylindrical center axis C as is cut by the cutting blade 2A into a circular pillar shape; and a holding member 3 having an elastic part 3A that is formed into a cylindrical shape along the inner face 2a of the cutting member 2, made rotatable relative to the cutting member 2 on the center axis C, and protrudes into a radially inner side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hole saw.

  Conventionally, for example, Patent Document 1 describes a hole saw in which a center drill is rotatably mounted with a tapered bush with a slit made of an elastic material. The hole saw of Patent Document 1 is used for drilling a gas conduit or the like, and a cutout piece drilled by a hole saw is held by a center drill by the elastic action of a tapered bush.

  Conventionally, for example, in Patent Document 2, a slider is mounted in a cylindrical main body having a cutting blade at the tip so as to be retractable inward, and a central portion of the slider is aligned along the axial direction. A hole saw in which guide holes are formed is described. In the hole saw of Patent Document 2, a portion protruding from a nut of a bolt for attaching a slate plate such as a roof to be repaired is accommodated and engaged in a guide hole so that the hole saw is operated accurately and easily. The drilling work for removing and repairing the slate plate is performed smoothly.

Japanese Utility Model Publication No. 61-163108 JP 2007-83324 A

  By the way, when a sample cut into a cylindrical shape by a hole saw is required, a hole is formed in the sample by a center drill and is damaged by the hole saw disclosed in Patent Document 1. When a sample cut into a cylindrical shape with a hole saw is required, the hole saw disclosed in Patent Document 2 must have a protruding portion on the sample.

  The present invention solves the above-described problems, and an object of the present invention is to provide a hole saw that can be collected without damaging the sample and preventing falling.

  In order to achieve the above-described object, a hole saw according to one aspect of the present invention has a cutting edge at a tip, is formed in a cylindrical shape, rotates around a cylindrical central axis, and is processed by the cutting edge. A cutting member capable of accommodating a sample obtained by cutting an object into a cylindrical shape in a cylinder, and a cylindrical member formed along the inner surface of the cutting member so as to be rotatable and movable relative to the cutting member around the central axis And a holding member having an elastic portion protruding radially inward.

  According to this hole saw, the sample is supported in the cylinder of the cutting member together with the holding member while the peripheral surface is held by the holding member by the elastic portion. As a result, even if there is no protruding portion for gripping the sample, it is possible to prevent the fall and collect the sample. Furthermore, since the sample is held on the holding member by the elastic portion, the sample can be prevented from being damaged.

  Moreover, in the hole saw which concerns on 1 aspect of this invention, it is preferable that the said cutting blade is arrange | positioned in the radial inside rather than the inner surface which the said holding member of the said cutting member follows.

  According to this hole saw, since the cutting edge is disposed radially inward from the inner surface of the cutting member, the cutting blade is disposed radially inward from the outer surface of the holding member along the inner surface of the cutting member. It is possible to prevent the holding member holding the sample from being dropped from the cutting member while being supported by the cutting blade. As a result, the sample can be reliably prevented from falling.

  In the hole saw according to one aspect of the present invention, it is preferable that a recess is formed on the inner surface of the cutting member, and the holding member is disposed inside the recess.

  According to this hole saw, it is possible to prevent the holding member holding the sample from dropping from the cutting member by arranging the holding member in the recess. As a result, the sample can be reliably prevented from falling.

  In the hole saw according to one aspect of the present invention, the radial innermost radius Ra of the cutting edge, the radial innermost radius Rb of the holding member, and the radial direction of the elastic portion with respect to the central axis. The relationship with the innermost radius Rc is preferably Rc <Ra ≦ Rb.

  According to this hole saw, the radially innermost radius Rc of the elastic part is smaller than the radially innermost radius Ra of the cutting edge, and is arranged on the radially innermost side, so that the cylindrical shape cut by the cutting edge is formed. The elastic portion can be reliably brought into contact with the peripheral surface of the sample, and the holding force of the sample can be improved. Moreover, since the radially innermost radius Rb of the holding member is equal to or less than the radially innermost radius Ra of the cutting blade, the holding member holding the sample is supported by the cutting blade via the elastic portion and falls off the cutting member. Can be prevented.

  In the hole saw according to one aspect of the present invention, the holding member includes a plurality of notches formed in a longitudinal direction in the extending direction of the central axis, and a portion between the notches. It is preferable that the elastic portion is formed by deforming inward in the radial direction.

  According to this hole saw, since the elastic part is formed between the circumferential directions of the plurality of notches formed in the longitudinal direction in the axial direction, the elastic part is radially outward when the peripheral surface of the sample comes into contact. It is deformed in the axial direction while being pushed. For this reason, the entire holding member is pushed outward in the radial direction but is greatly deformed in the axial direction, so that the mutual sliding resistance with the inner surface of the cutting member is reduced, and the sliding load between them is suppressed. be able to. And since the contact area with the inner surface of a cutting member decreases because the notch part is provided with two or more by the circumferential direction, the mutual sliding load can be suppressed.

  Further, in the hole saw according to one aspect of the present invention, the holding member is formed to have one portion in the circumferential direction and elastic in the radial direction, and a radially outermost radius Rd with respect to the central axis is It is preferable that the relationship of Re <Rd is satisfied with respect to the radius Re of the innermost surface in the radial direction along which the holding member of the cutting member extends.

  According to this hole saw, since the holding member is supported by its own elastic deformation in the cylinder of the cutting member, it is possible to prevent the holding member from falling off the cutting member when the sample is not held, and The holding member can be prevented from falling off from the cutting member when holding the sample. Further, since the holding member is cut at one place in the circumferential direction by the dividing portion and is elastic in the radial direction, the holding member can be easily installed in the cylinder of the cutting member.

  In the hole saw according to one aspect of the present invention, it is preferable that the holding member has the elastic portion formed on a distal end side of the cutting member.

  According to this hole saw, the elastic part of the holding member is formed on the distal end side of the cutting member, so that the cylindrical sample cut by the cutting blade at the distal end of the cutting member is applied to the elastic part immediately after being cut. Contact. For this reason, the sample can be reliably held by the elastic portion, and the sample can be sufficiently held.

  In the hole saw according to one aspect of the present invention, it is preferable that the holding member is subjected to finishing at corners.

  According to this hole saw, it is preferable that the corners are finished to prevent the elastic portion from being damaged.

  According to the present invention, it is possible to collect the sample without damaging it and preventing the sample from falling.

FIG. 1 is a side sectional view of a hole saw according to an embodiment of the present invention. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a side sectional view showing a usage state of the hole saw according to the embodiment of the present invention. FIG. 4 is a partially enlarged side sectional view of the hole saw according to the embodiment of the present invention. FIG. 5 is an exploded side sectional view of the hole saw according to the embodiment of the present invention. FIG. 6 is a side sectional view of another example of the hole saw according to the embodiment of the present invention. FIG. 7 is a side sectional view of another example of the hole saw according to the embodiment of the present invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a side sectional view of a hole saw according to the present embodiment. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a side sectional view showing a usage state of the hole saw according to the present embodiment. FIG. 4 is a partially enlarged side sectional view of the hole saw according to the present embodiment. FIG. 5 is an exploded side sectional view of the hole saw according to the present embodiment. FIG. 6 is a side sectional view of another example of the hole saw according to the present embodiment. FIG. 7 is a side sectional view of another example of the hole saw according to the present embodiment.

  As shown in FIGS. 1 and 2, the hole saw 1 of the present embodiment includes a cutting member 2 and a holding member 3.

  The cutting member 2 is formed in a cylindrical shape. Here, a direction around the cylindrical central axis C of the cutting member 2 is referred to as a circumferential direction, a direction parallel to the central axis C is referred to as an axial direction, and a direction orthogonal to the central axis C is referred to as a radial direction. The cylindrical inner surface 2a of the cutting member 2 is formed on a smooth surface having no irregularities. Moreover, the cylindrical inner surface 2a of the cutting member 2 is formed without changing its inner diameter in the axial direction. This cutting member 2 has a cutting edge 2A formed at the distal end in the axial direction, a connecting portion 2B formed at the proximal end in the axial direction, and a through hole 2C formed at the proximal end in the axial direction. ing.

  The cutting blade 2 </ b> A is fixed to a cylindrical axial tip of the cutting member 2 by brazing. A plurality of (for example, six) cutting blades 2A are arranged along the cylindrical circumferential direction of the cutting member 2.

  The connecting portion 2B is provided on the central axis C so as to extend outward in the axial direction at a portion where the cylindrical axial base end of the cutting member 2 is closed. The connecting portion 2B is formed in a columnar shape centered on the central axis C, and a female screw is formed on the outer peripheral surface thereof. The connecting portion 2B is fixed to a rotating shaft (not shown) by this female screw.

  The through hole 2C passes through the connecting portion 2B and a portion of the cutting member 2 where the cylindrical axial base end is closed, and communicates the inside and the outside of the cutting member 2 with each other. 2 C of through-holes supply the cooling water sent through the rotating shaft to which the connection part 2B was connected in the cylinder of the cutting member 2. As shown in FIG.

  The cutting member 2 rotates in the circumferential direction around the central axis C through the connection portion 2B by the rotation of the rotation shaft to which the connection portion 2B is fixed. Then, the cutting blade 2 </ b> A rotates in the circumferential direction by the rotation of the cutting member 2. Further, by moving the rotation axis in the axial direction which is the extending direction of the central axis C, the cutting blade 2A moves in the axial direction while rotating. The cutting blade 2A that moves in the axial direction while rotating and cutting the workpiece as a cylindrical sample 100 (see FIG. 3). The cut cylindrical sample 100 is accommodated in the cylinder of the cutting member 2.

  The holding member 3 is formed in a cylindrical shape and is provided in the cylinder of the cutting member 2, and is provided along the cylindrical inner surface 2 a of the cutting member 2. Further, the holding member 3 is provided to be rotatable relative to the cutting member 2 around the central axis C. The rotational movement of the holding member 3 is rotationally moved by sliding with respect to the cylindrical inner surface 2a of the cutting member 2, and is not supported by the cutting member 2 via a rotation shaft or the like.

  The holding member 3 has an elastic portion 3A that protrudes inward in the radial direction. The elastic portion 3A is made of a material having elasticity in the holding member 3 itself, and a plurality of cutout portions 3B formed along the axial direction in which the central axis C extends are provided in the circumferential direction. It is formed by deforming the portion between 3B radially inward.

  In such a hole saw 1, as shown in FIG. 3, a cylindrical sample 100 in which a workpiece is cut by the cutting member 2 is accommodated in a cylinder of the cutting member 2. And in the cylinder of the cutting member 2, the sample 100 is hold | maintained at the holding member 3 because a surrounding surface contacts the elastic part 3A. Further, the holding member 3 is supported inside the cutting member 2 because it contacts the elastic portion 3 </ b> A on the peripheral surface of the sample 100 and expands radially outward to contact the inner surface 2 a of the cutting member 2.

  In the cutting process of the workpiece, the cutting blade 2A starts to cut the workpiece into the cylindrical sample 100 as the cutting member 2 rotates and moves in the axial direction. At this time, the holding member 3 rotates together with the cutting member 2. Then, when the sample 100 being cut gradually enters the cylinder of the cutting member 2 and the peripheral surface of the sample 100 comes into contact with the elastic portion 3A, the holding member 3 engages with the sample 100 and stops rotating. Only the cutting member 2 rotates and slides relative to the cutting member 2. When the cutting blade 2A penetrates the workpiece, the cylindrical sample 100 is supported in the cylinder of the cutting member 2 in a form held by the holding member 3.

  Further, when the collected sample 100 is taken out from the holding member 3 and the cutting member 2, the sample 100 can be easily taken out by pushing the sample 100 axially toward the tip from the outside of the through hole 2C with a rod-like member. . The through-hole 2C is configured to be used in combination with a hole for supplying cooling water to the inside of the cutting member 2, but another through-hole (not shown) that does not penetrate the connecting portion 2B is provided as a cylinder in the cutting member 2. A portion where the axial base end is closed may be provided.

  Thus, according to the hole saw 1 of the present embodiment, the sample 100 is supported in the cylinder of the cutting member 2 together with the holding member 3 while the peripheral surface is held by the holding member 3 by the elastic portion 3A. Even if there is no projecting portion for gripping the sample 100, the sample 100 can be recovered while preventing the drop. Furthermore, since the sample 100 is held on the holding member 3 by the elastic portion 3A, the sample 100 can be prevented from being damaged.

  Moreover, in the hole saw 1 of this embodiment, as shown in FIG. 4, the cutting blade 2 </ b> A is disposed radially inward from the inner surface 2 a of the cutting member 2. Specifically, the cutting edge 2 </ b> A has a radially inner surface 2 </ b> Aa disposed on the radially inner side of the cylindrical inner surface 2 a of the cutting member 2. In the cutting blade 2A of the present embodiment, the inner surface 2Aa is provided from the tip of the cutting member 2 toward the tip of the cutting member 2 and is gradually inclined inward in the axial direction.

  According to the hole saw 1, the cutting edge 2 </ b> A is arranged radially inward of the inner surface 2 a of the cutting member 2, so that the cutting edge 2 </ b> A is more than the outer surface of the holding member 3 along the inner surface 2 a of the cutting member 2. Since it is arranged on the inner side in the radial direction, it can be prevented that the holding member 3 holding the sample 100 is supported by the cutting blade 2A and dropped from the cutting member 2. As a result, the sample 100 can be reliably prevented from falling.

  Further, in the hole saw 1 of the present embodiment, as shown in FIG. 4, the radial innermost radius Ra of the cutting edge 2 </ b> A, the radial innermost radius Rb of the holding member 3, and the elasticity with respect to the central axis C The relationship with the radius Rc at the radially innermost side of the portion 3A is preferably Rc <Ra ≦ Rb.

  According to this hole saw 1, the radial innermost radius Rc of the elastic portion 3 </ b> A is smaller than the radial innermost radius Ra of the cutting blade 2 </ b> A and is disposed on the radial innermost side, thereby being cut by the cutting blade 2 </ b> A. The elastic portion 3A can be reliably brought into contact with the peripheral surface of the cylindrical sample 100, and the holding force of the sample 100 can be improved. In addition, since the innermost radius Rb of the holding member 3 is equal to or less than the innermost radius Ra of the cutting blade 2A, the holding member 3 holding the sample 100 via the elastic portion 3A is moved by the cutting blade 2A. It is possible to prevent the cutting member 2 from falling off.

  Moreover, in the hole saw 1 of this embodiment, as shown in FIGS. 1 and 2, the holding member 3 has a notch 3B formed in a longitudinal shape in the extending direction (axial direction) of the central axis C in the circumferential direction. It is preferable that a plurality (six in this embodiment) is provided, and the elastic portion 3A is formed by deforming the portion between the notches 3B inward in the radial direction.

  According to this hole saw 1, since the elastic portion 3A is formed between the circumferential directions of the plurality of cutout portions 3B formed in the longitudinal direction in the axial direction, when the peripheral surface of the sample 100 comes into contact, the elastic portion 3A is deformed in the axial direction while being pushed radially outward. For this reason, the entire holding member 3 is pushed outward in the radial direction but is greatly deformed in the axial direction. Therefore, the mutual sliding resistance with the inner surface 2a of the cutting member 2 is reduced, and the sliding load between them is reduced. Can be suppressed. And since the contact area with the inner surface 2a of the cutting member 2 decreases because the notch part 3B is provided with two or more by the circumferential direction, the mutual sliding load can be suppressed.

  In order to suppress the sliding load between the cutting member 2 and the holding member 3, it is preferable that the inner surface 2a of the cutting member 2 and the outer surface of the holding member 3 are configured as smooth surfaces without unevenness. Further, in order to suppress the sliding load between the cutting member 2 and the holding member 3, it is preferable that the radially outer edge of the notch 3B is chamfered.

  Moreover, in the hole saw 1 of this embodiment, as shown in FIG. 5, the holding member 3 is formed in one part in the circumferential direction by the dividing part 3C and elastic in the radial direction. The radial outermost radius Rd with respect to the central axis C preferably has a relationship of Re <Rd with respect to the radius Re of the radially innermost inner surface 2a along which the holding member 3 of the cutting member 2 extends.

  According to the hole saw 1, since the holding member 3 is supported by its own elastic deformation in the cylinder of the cutting member 2, the holding member 3 is prevented from falling off the cutting member 2 when the sample 100 is not held. The holding member 3 can be prevented from dropping from the cutting member 2 when the sample 100 is held. In addition, since the holding member 3 is cut at one place in the circumferential direction by the dividing portion 3 </ b> C and has elasticity in the radial direction, the holding member 3 is easily installed in the cylinder of the cutting member 2. be able to.

  Moreover, in the hole saw 1 of this embodiment, as shown in FIG. 6, the holding member 3 is preferably formed with the elastic portion 3 </ b> A on the distal end side in the axial direction of the cutting member 2. The holding member 3 shown in FIG. 6 is formed with a plurality of notches 3B in the circumferential direction with the notches 3B open to the distal end side (cutting blade 2A side) of the cutting member 2 in the axial direction, and between the notches 3B in the circumferential direction. An elastic portion 3A is provided. Accordingly, the elastic portion 3 </ b> A is provided on the distal end side in the axial direction of the holding member 3. Further, the axial tip of the elastic portion 3A is formed outward in the radial direction.

  According to the hole saw 1, since the elastic portion 3 </ b> A of the holding member 3 is formed on the distal end side of the cutting member 2, the cylindrical sample 100 cut by the cutting blade 2 </ b> A at the distal end of the cutting member 2 is cut. Immediately thereafter, the elastic portion 3A is contacted. For this reason, the sample 100 can be reliably held by the elastic portion 3A, and the sample 100 can be sufficiently held. In addition, since the tip of the elastic part 3A is formed outward in the radial direction, the cut sample 100 can be smoothly guided to the elastic part 3A, and the tip of the elastic part 3A interferes with the sample 100. The situation can be prevented.

  The shape of the elastic portion 3A is not limited to the form extending along the axial direction as shown in FIGS. 1 and 6, and may be formed in a spiral around the central axis C, for example. Moreover, the elastic part 3A is not limited to one in the axial direction, and a plurality of elastic parts may be provided. Further, in order to prevent the elastic portion 3A from being scratched on the sample 100, the inner edge corner of the cutout portion 3B and the outer edge corner of the elastic portion 3A are processed to remove burrs during molding. It is preferable. Specifically, chamfering is applied to the corner of the inner edge of the notch 3B or the corner of the outer edge of the elastic portion 3A, or the corner of the inner edge of the notch 3B or the corner of the outer edge of the elastic portion 3A. It is preferable that rounded chamfering is performed. Here, processes such as chamfering and R chamfering are collectively referred to as finishing.

  Moreover, in the hole saw 1 of this embodiment, the recessed part 2D is formed in the inner surface 2a of the cutting member 2, as shown in FIG. The recess 2 </ b> D is a depth that receives the radial thickness of the holding member 3, and is formed in an axial dimension that receives the axial dimension of the holding member 3. And the holding member 3 mentioned above is arrange | positioned inside the recessed part 2D. The holding member 3 is disposed along the inner surface 2a of the cutting member 2 that is the bottom surface of the recess 2D. Here, as shown in FIG. 7, with respect to the central axis C, the radially innermost radius Ra of the cutting edge 2A, the radially innermost radius Rb of the holding member 3, and the radially innermost radius of the elastic portion 3A. The relationship with the radius Rc is Rc <Ra ≦ Rb.

  According to the hole saw 1, the holding member 3 is disposed in the recess 2 </ b> D, so that the holding member 3 holding the sample 100 can be prevented from dropping from the cutting member 2. As a result, the sample 100 can be reliably prevented from falling.

  By the way, the hole saw 1 of the present embodiment is applied to recover various cut samples 100. Note that, for example, when the sample 100 is recovered from a workpiece that has been exposed to radiation or activated in a nuclear facility, it is desired to recover the sample 100 without damaging the sample 100 and preventing the sample 100 from falling. In addition, for example, when the sample 100 is recovered from a processing object at a high place, it is also desired to recover the sample 100 without damaging the sample 100 and preventing the sample 100 from falling. As described above, the hole saw 1 of the present embodiment is applied to recovering various cut samples 100.

DESCRIPTION OF SYMBOLS 1 Hole saw 2 Cutting member 2a Inner surface 2A Cutting blade 2Aa Inner surface 2B Connection part 2C Through-hole 2D Recess 3 Holding member 3A Elastic part 3B Notch part 3C Dividing part 100 Sample C Center axis

Claims (8)

A cutting member that has a cutting edge at the tip and is formed in a cylindrical shape, and rotates around a cylindrical central axis, and a sample obtained by cutting a workpiece into a cylindrical shape by the cutting edge can be accommodated in the cylinder;
A holding member having an elastic portion that is formed in a cylindrical shape along the inner surface of the cutting member and is provided so as to be rotatable relative to the cutting member around the central axis and protrudes radially inward;
Hole saw equipped with.   The hole saw according to claim 1, wherein the cutting blade is disposed radially inward from an inner surface along which the holding member of the cutting member extends.   The hole saw according to claim 1, wherein a concave portion is formed on an inner surface of the cutting member, and the holding member is disposed inside the concave portion.   The relationship between the radial innermost radius Ra of the cutting edge, the radial innermost radius Rb of the holding member, and the radial innermost radius Rc of the elastic portion with respect to the central axis is Rc < The hole saw according to claim 2 or 3, wherein Ra≤Rb.   The holding member is provided with a plurality of circumferentially formed notches formed in the extending direction of the central axis, and the elastic portion is formed by deforming a portion between the notches radially inward. The hole saw according to any one of claims 1 to 4, wherein the hole saw is formed.   The holding member is formed at one portion in the circumferential direction to be elastic in the radial direction, and the radially outermost radius Rd with respect to the central axis is the outermost radial direction along which the holding member of the cutting member extends. The hole saw according to any one of claims 1 to 5, wherein a relation Re <Rd is satisfied with respect to a radius Re of the inner inner surface.   The hole saw according to any one of claims 1 to 6, wherein the holding member has the elastic portion formed on a distal end side of the cutting member.   The hole saw according to any one of claims 1 to 7, wherein the holding member is subjected to finishing at a corner portion.

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