Deburring tools

Abstract

To provide a deburring tool that has a simplified structure, can be easily attached to a drilled hole in a workpiece, and can efficiently remove burrs on the back side of the workpiece from the front side. [Solution] A deburring tool 100 for removing burrs on the back side generated when drilling a workpiece 1 from the front side, comprising an outer tube 11 that can be inserted into the drilling hole, an operating shaft 12 that is fitted inside the outer tube 11 and is movable axially and rotatable relative to the outer tube 11, and a deburring blade portion 14 that extends in one radial direction of the operating shaft 12 at one end side of the operating shaft 12 and has a cutting edge 14a formed toward the other end side of the operating shaft 12, the deburring blade portion 14 being formed so that its length in one direction including the operating shaft 12 when viewed in the axial direction of the operating shaft 12 is less than the outer diameter of the outer tube 11, and when the operating shaft 12 is fitted inside the outer tube 11, at least a part of the cutting edge 14a protrudes outward in the radial direction beyond the outer tube 11.

Description

[Technical Field]

[0001] This invention relates to a deburring tool that removes burrs from the front side of a workpiece that are generated on the back side when a hole is drilled. [Background technology]

[0002] In a wide range of industrial fields, holes are drilled at desired locations in workpieces such as plate or pipe materials made of metal, resin, etc., using a drill or other tool. When drilling such holes in a workpiece, burrs are generated around the holes on the front and back surfaces of the workpiece. These burrs have a negative effect when applying anti-corrosion paint to the workpiece after drilling, or when screwing the holes, so it is preferable to remove them beforehand.

[0003] Burrs that occur on the surface of a workpiece can be easily removed from the surface using a deburring tool. On the other hand, burrs that occur on the backside of a workpiece usually have to be deburred from the backside, which makes the work less efficient. In other words, if there is no working space available on the backside of the workpiece, the workpiece must be moved, such as by being turned upside down, which increases the work time. This is especially true when the workpiece is heavy, which places a strain on the worker.

[0004] Furthermore, when the workpiece is a tubular member or a fixed object and no working space can be secured on the back side of the workpiece, a method has been adopted in which a deburring tool such as a spherical grinding wheel or a spherical cutting tool is attached to the tip of an electric tool, and the deburring tool is inserted into a perforation from the outer surface side of the tubular member, etc., and the burrs are removed with the deburring tool. However, when removing burrs using this method, it is necessary to remove the burrs while moving the deburring tool along the edge of the perforation, which not only makes the work complicated and time-consuming, but also has the problem of not being able to remove the burrs uniformly and cleanly.

[0005] Given this situation, there is a demand for a deburring tool that can remove burrs from the front surface side that are generated on the back surface of a workpiece when a hole is drilled, and such a deburring tool has been provided (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-144553 Summary of the Invention [Problem to be solved by the invention]

[0007] The deburring tool described in Patent Document 1 is designed to remove burrs manually, and requires a deburring member that can be freely extended and retracted in the circumferential direction of the cylindrical body of the deburring tool, and after the cylindrical body is inserted into a drilled hole, the deburring member is expanded in the circumferential direction to remove the burr on the back side. Therefore, it is necessary to provide a deburring member operating mechanism for extending and retracting the deburring member in the circumferential direction of the cylindrical body, a pressing member that presses the deburring member to extend and retract it, and an operating member that allows the operator to operate the pressing member from outside the cylindrical body, which results in a problem that the structure of the deburring tool becomes very complicated.

[0008] Furthermore, because the deburring tool must be rotated while the pressing member is pressed against the biasing force of the return spring to remove the burrs, the deburring work is a very tedious manual process. Moreover, since the deburring member is free to protrude and retract when the pressing member is returned by the return spring, when the deburring tool is inserted into a horizontally drilled hole, the deburring member may protrude outward due to its own weight, and this protruding deburring member may get caught on the edge of the hole, making it difficult to insert the deburring tool into the hole.

[0009] The present invention was made with this in mind, and its purpose is to provide a deburring tool that simplifies the structure of the tool, is easy to attach to a drilled hole in a workpiece, and can efficiently remove burrs from the back side of the workpiece from the front side. [Means for solving the problem]

[0010] In order to achieve the above-mentioned object, the deburring tool of the present invention is a deburring tool that removes burrs on the back side generated when drilling a workpiece from the front side, and is characterized by having an outer tube that can be inserted into the drilling hole, an operating shaft that is fitted inside the outer tube and is movable axially and rotatable relative to the outer tube, and a deburring blade portion that extends in one radial direction of the operating shaft at one end side of the operating shaft and has a cutting edge formed toward the other end side of the operating shaft, and the deburring blade portion is formed so that the length in the one direction including the operating shaft when viewed in the axial direction of the operating shaft is equal to or shorter than the outer diameter of the outer tube, and at least a part of the cutting edge protrudes outward in the radial direction beyond the outer tube.

[0011] According to the above-described characteristic configuration, when removing burrs on the back side of a workpiece that are generated when a hole is drilled, the outer cylinder rotatably holds the operating shaft while the outer cylinder is in contact with the inside of the drilled hole, so that burrs on the back side of the workpiece that are generated when a hole is drilled can be removed simply by rotating the operating shaft with the deburring blade portion provided on the operating shaft abutting the back side of the workpiece. Thus, while maintaining a simple structure with an outer cylinder, operating shaft, and deburring blade portion, burrs on the back side of the workpiece can be efficiently removed from the front side.

[0012] Furthermore, according to the above-described characteristic configuration, the deburring blade portion is formed so that its length in one direction including the operating shaft, as viewed in the axial direction of the operating shaft, is equal to or less than the outer diameter of the outer cylinder. In other words, the cross-sectional dimension of the deburring blade portion including the operating shaft in one direction perpendicular to the operating shaft is equal to or less than the outer diameter of the outer cylinder. Therefore, with the outer cylinder positioned at the other axial end, the operating shaft is inserted into the drilling hole until the deburring blade portion is positioned on the back side of the workpiece, allowing the deburring tool to be easily attached to the drilling hole in the workpiece. Furthermore, since at least a portion of the cutting edge of the deburring blade portion protrudes radially outward from the outer cylinder when the operating shaft is fitted into the outer cylinder, by rotating the deburring tool in the axial direction while the deburring tool is installed in the drilling hole in the workpiece, the portion of the cutting edge protruding radially outward from the outer periphery of the outer cylinder can abut against and remove burrs around the drilling hole on the back side of the workpiece. This facilitates attachment to the drilling hole in the workpiece and enables efficient removal of burrs from the front side of the workpiece.

[0013] A further characteristic feature of the deburring tool according to the present invention for achieving the above object is that it is provided with a biasing means for biasing the outer cylinder toward one end of the operating shaft.

[0014] According to the above-described characteristic configuration, a biasing means is provided that biases the outer cylinder toward one end of the operating shaft, so that the outer cylinder can be biased toward the deburring blade provided at one end of the operating shaft. Therefore, when the deburring tool is attached to a drilled hole in a workpiece and the operating shaft is rotated to remove burrs from the back side of the workpiece, the biasing force of the biasing means biases the outer cylinder toward the deburring blade, preventing the outer cylinder from moving toward the other end of the operating shaft and falling out of the drilled hole in the workpiece, thereby enabling stable deburring. Therefore, burrs on the back side of the workpiece can be efficiently removed from the front side.

[0015] A further characteristic feature of the deburring tool of the present invention for achieving the above object is that an outer tube enlarged portion having an outer diameter larger than the outer diameter of the outer tube is provided on the other end side of the outer tube.

[0016] In the deburring tool of the present invention, it is necessary to move the outer tube toward the other end in the axial direction when attaching it to the drilling hole in the workpiece.However, according to the above-mentioned characteristic configuration, an outer tube expanded portion is provided at the other end of the outer tube, so that the worker can grasp this outer tube expanded portion and easily move the outer tube toward the other end in the axial direction, making it easy to attach the deburring tool to the drilling hole in the workpiece.

[0017] A further characteristic feature of the deburring tool of the present invention for achieving the above-mentioned object is that the cutting edge of the deburring blade portion is formed in a state inclined toward the one end from the inside to the outside in the radial direction.

[0018] According to the above-described characteristic configuration, the cutting edge of the deburring blade is formed in a state inclined toward one end from the inside to the outside in the radial direction of the operating shaft, so that the cutting edge is most likely to come into contact with the back side of the workpiece near the opening of the hole, where burrs are likely to occur when the workpiece is drilled. This prevents the cutting edge from unnecessarily damaging the back side of the workpiece away from the opening of the hole, and makes it possible to efficiently remove burrs from the back side of the workpiece.

[0019] A further characteristic feature of the deburring tool of the present invention for achieving the above object is that an inclined surface is formed on one end side of the deburring blade portion, which gradually extends radially outward from the one end side toward the other end side of the operating shaft.

[0020] According to the above characteristic configuration, an inclined surface is formed on one end side of the deburring blade portion that gradually extends outward from one end side to the other end side. Therefore, when attaching the deburring tool to a drill hole in a workpiece, it is easy to insert the deburring blade portion into the drill hole from the front side of the workpiece, thereby improving the insertability of the deburring tool into the drill hole in the workpiece.

[0021] A further characteristic feature of the deburring tool according to the present invention for achieving the above object is that a chucking portion is formed on the other end of the operating shaft, which is removably held by the chuck of the electric motor.

[0022] According to the above characteristic configuration, the operating shaft can be held in the chuck of the power tool, so that burrs on the back side of the workpiece that are generated when a hole is drilled using the electric motor can be efficiently removed. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 2 is a perspective view of a deburring tool. [Figure 2] FIG. 2 is a side view of the deburring tool. [Figure 3] FIG. [Figure 4] 1A and 1B are diagrams illustrating a deburring method using a deburring tool. [Figure 5] FIG. 1 is a view of the deburring tool as seen from the back side of the workpiece. [Figure 6] FIG. 1 is a view of the deburring tool as seen from the back side of the workpiece. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 and 2, a deburring tool 100 according to the present invention is capable of removing burrs on the back side generated when drilling a hole in a workpiece from the front side, and includes an outer cylinder 11 that can be inserted into a drilled hole 2 (see FIG. 4) in the workpiece 1, an operating shaft 12 that is fitted inside the outer cylinder 11 and is movable axially relative to the outer cylinder 11 and is rotatable relative to the outer cylinder 11, and a deburring blade 14 that extends in one radial direction of the operating shaft 12 at one end of the operating shaft 12 and has a cutting edge 14a formed toward the other end of the operating shaft 12. Note that the one end refers to the end of the deburring tool 100 where the deburring blade 14 is provided, and the other end refers to the opposite end.

[0025] The outer cylinder 11 is composed of a tubular member whose outer diameter is slightly smaller than the borehole 2 formed in the workpiece 1, and a through-hole 20 is formed in the center of the outer cylinder 11 over its entire length. The diameter of the through-hole 20 in the outer cylinder 11 is larger than the outer diameter of the operating shaft 12, and the operating shaft 12 is slidably inserted into the through-hole 20. As will be described in more detail below, this configuration allows the deburring tool 100 according to the present invention to be inserted into the borehole 2 from the front side of the workpiece and to be appropriately installed in the borehole 2 so as to remove burrs on the back side of the workpiece.

[0026] Further, the other end of the outer tube 11 is provided with an outer tube expanded diameter portion 11a having an outer diameter larger than the drilling hole 2. This outer tube expanded diameter portion 11a allows the outer tube 11 to be stably biased toward the deburring blade portion 14 by a coil spring 13 serving as a biasing means, which will be described later. Furthermore, with the deburring tool 100 according to the present invention, it is necessary to move the outer tube 11 toward the other end in the axial direction when attaching it to the drilling hole 2 in the workpiece 1. However, the operator can easily move the outer tube 11 toward the other end in the axial direction by grasping this outer tube expanded diameter portion 11a, making it easy to attach the deburring tool 100 to the drilling hole 2 in the workpiece 1.

[0027] As described above, the operating shaft 12 is fitted into the through-hole 20 of the outer cylinder 11, and one end of the operating shaft 12 is provided with a deburring blade portion 14 that protrudes outward from the outer cylinder 11. The other end of the operating shaft 12 is formed with a chucking portion 12a that can be detachably attached to a chuck of a power tool (not shown). The chucking portion 12a is provided so as not to rotate relative to the operating shaft 12, and in this embodiment is formed with a hexagonal shank.

[0028] As described above, the deburring blade 14 extends outward in one radial direction D (see FIG. 6) from a part of the outer peripheral surface of the operating shaft 12, with the cutting edge 14a directed toward the other end of the operating shaft 12. In this embodiment, the deburring blade 14 is formed in a substantially plate shape, omittedThe plate-shaped deburring blade portion 14 is provided on the outer peripheral surface of the operating shaft 12 with its longitudinal direction aligned with the axial direction of the surface of the operating shaft 12. The deburring blade portion 14 is formed so that its length in one direction D, including the operating shaft 12, when viewed in the axial direction of the operating shaft 12 is equal to or less than the outer diameter of the outer tube 11, and so that at least a portion of the cutting edge 12a protrudes radially outward from the outer tube 11 when the operating shaft 12 is fitted inside the outer tube 11 (see FIG. 7 ). That is, the deburring blade portion 14 is formed so that the length in one direction D, at a cross section perpendicular to the operating shaft 12, at which the length in one direction D, including the deburring blade portion 14 and the operating shaft 12, is longest, is equal to or less than the outer diameter of the outer tube 11. In addition, when the operating shaft 12 is fitted inside the outer tube 11, the radially outer tip portion of the cutting edge 12a protrudes radially outward from the outer periphery of the outer tube 11. As described above, the outer diameter of the outer cylinder 11 is formed to be smaller than the inner diameter of the drilling hole 2. With this configuration, as described above, it becomes possible to insert the deburring blade portion 14 formed on the operating shaft 12 from the drilling hole 2 to the back side of the workpiece, and remove burrs on the back side with the deburring blade portion 14.

[0029] In addition, an inclined surface 14b is formed on one end side of the deburring blade portion 14, which gradually extends radially outward from the one end side to the other end side of the operating shaft 12, and is configured so that when the deburring blade portion 14 is inserted from the drilling hole 2 to the back side of the workpiece 1, it can be easily inserted to the back side of the workpiece 1 even if there is an obstacle such as a burr in the drilling hole 2.

[0030] The cutting edge 14a of the deburring blade portion 14, which is formed toward the other end, directly contacts and removes burrs that occur at the rear opening edge of the drilled hole 2 when drilling the workpiece 1. This cutting edge 14a is formed so as to be inclined toward one end from the inside to the outside in the radial direction of the operating shaft 12. Specifically, as shown in FIG. 3, the cutting edge 14a is inclined toward the one end by an angle of α° from a perpendicular line S that is perpendicular to the axial direction of the operating shaft 12. α° is preferably 2 to 10°, and more preferably 3 to 5°. In this embodiment, it is set to 3°.

[0031] In this embodiment, a coil spring 13 is used as a biasing means for biasing the outer tube 11 toward one end of the operating shaft 12. The coil spring 13 is provided between the outer tube 11 and the chucking portion 12a so as to be freely contractible when the operating shaft 12 is inserted therein. Specifically, the coil spring 13 biases the outer tube 11 toward the deburring blade portion 14 with the other end abutting the chucking portion 12a and one end contacting the enlarged diameter portion 11a of the outer tube. This allows the outer tube 11 to be inserted into the drilling hole 2 by the biasing force of the coil spring 13 when the deburring tool 100 is inserted into the drilling hole 2. This allows the outer tube 11, into which the operating shaft 12 is fitted, to be positioned within the drilling hole 2. Therefore, when the operating shaft 12 is rotated to remove burrs generated at the edge of the back opening of the drilling hole 2 with the deburring blade portion 14, the angle at which the cutting edge 14a contacts the back side of the drilling hole 2 can be appropriately maintained at all rotation angles of the operating shaft 12. This allows the cutting edge 14a to properly abut on the burrs at the rear opening edge, making it possible to efficiently remove the burrs.

[0032] Next, a deburring method using this deburring tool 100 will be described with reference to FIG. 4. First, as shown in FIG. 4(a), the outer tube 11 is moved toward the other end against the biasing force of the coil spring 13, so that the shaft portion at one end of the operating shaft 12 protrudes outward from the outer tube 11. In this state, as shown in FIG. 4(b), the operating shaft 12 of the deburring tool 100 is inserted into the drilled hole 2 in the workpiece 1. At this time, because the inclined surface 14b is formed on one end of the deburring blade 14, it can be easily inserted all the way to the back side of the workpiece even if there is an obstacle such as a burr in the drilled hole 2. Note that FIG. 5 is a view of the deburring tool 100 inserted into the drilled hole 2 shown in FIG. 4(b), viewed from the back side of the workpiece 1.

[0033] Furthermore, as shown in FIG. 4(c), the operating shaft 12 is inserted into the drilling hole 2 until the cutting edge 14a formed on the other end of the deburring blade portion 14 is positioned on the back side of the workpiece 1. Once the deburring blade portion 14 is positioned on the back side of the workpiece 1, as shown in FIG. 4(d), the outer cylinder 11 is moved toward one end by the biasing force of the coil spring 13, and the outer cylinder 11 is inserted into the drilling hole 2. This allows the operating shaft 12 fitted inside the outer cylinder 11 to be positioned in the center of the drilling hole 2. Note that FIG. 6 is a view of the deburring tool 100 as seen from the back side of the workpiece 1, showing the state of insertion of the deburring tool 100 into the drilling hole 2 shown in FIG. 4(d).

[0034] By rotating the chucking portion 12a while the outer tube 11 is inserted through the drilling hole 2 in this manner, the deburring blade portion 14 appropriately contacts the back-side opening edge at all rotation angles, thereby effectively removing burrs (not shown) that have occurred at the back-side opening edge of the drilling hole 2. The angle at which the cutting edge 14a is inclined toward one end is α° from a perpendicular line S that is perpendicular to the axial direction of the operating shaft 12. Therefore, the cutting edge 14a can effectively remove only burrs that have occurred at the back-side opening edge without damaging areas of the back side of the workpiece 1 that are distant from the opening edge. Furthermore, by rotating the deburring tool 100 while slightly pulling the chucking portion 12a toward the other end, burrs can be removed even more effectively.

[0035] After the burrs have been removed in this manner, the outer cylinder 11 is again moved toward the other end against the biasing force of the coil spring 13, as shown in Figure 4(c), and the deburring tool 100 can be removed from the perforation 2 in the workpiece 1. When burrs are to be removed from the rear surfaces of a plurality of perforations 2, the above-described operation can be repeated to sequentially remove the burrs from the rear surfaces of the plurality of perforations 2.

[0036] [Another embodiment] Other embodiments will be listed below. (1) In the above embodiment, the deburring blade portion 14 is formed in a plate shape and is provided on the outer peripheral surface of the operating shaft 12 with the longitudinal direction of the plate-shaped deburring blade portion 14 axially aligned with the surface of the operating shaft 12. However, this is not limited to this, and the deburring blade portion 14 may be formed in a rod shape extending radially outward from a portion of the outer peripheral surface of the operating shaft 12.

[0037] (2) In the above embodiment, the chucking portion 12a is configured as a hexagonal shank, but this is not limiting, and the chucking portion 12a may be configured as a straight shank or a tapered shank.

[0038] Furthermore, the configurations disclosed in the above embodiments (including other embodiments, the same applies below) can be applied in combination with configurations disclosed in other embodiments, as long as no contradictions arise. Furthermore, the embodiments disclosed in this specification are examples, and the embodiments of the present invention are not limited to these, and can be modified as appropriate within the scope that does not deviate from the purpose of the present invention. [Industrial Applicability]

[0039] As described above, it is possible to provide a deburring tool that simplifies the structure of the tool, is easy to attach to a drilled hole in a workpiece, and can efficiently remove burrs on the back side of the workpiece from the front side. [Explanation of symbols]

[0040] 1 Workpiece 2 perforation 11 Outer cylinder 11a Outer cylinder enlarged diameter portion 12 Operation axis 12a Chucking part 13 Coil spring (biasing means) 14 Deburring blade 14a cutting edge 14b Slope 20 through holes 100 Deburring Tools D One direction

Claims

1. A deburring tool that removes burrs on the back side generated when drilling a workpiece from the front side, an outer cylinder that can be inserted into the hole; an operating shaft fitted inside the outer cylinder so as to be movable in the axial direction and rotatable relative to the outer cylinder; a deburring blade portion extending in one radial direction of the operating shaft at one end side of the operating shaft and having a cutting edge formed toward the other end side of the operating shaft, The deburring blade portion is formed so that the length in one direction including the operating shaft when viewed in the axial direction of the operating shaft is equal to or less than the outer diameter of the outer cylinder, and at least a portion of the cutting edge protrudes outward from the outer cylinder in the radial direction.

2. 2. A deburring tool according to claim 1, further comprising a biasing means for biasing the outer cylinder toward one end of the operating shaft.

3. 2. The deburring tool according to claim 1, wherein the other end of the outer cylinder is provided with an enlarged outer cylinder portion having an outer diameter larger than the outer diameter of the outer cylinder.

4. The deburring tool according to claim 1 , wherein the cutting edge of the deburring blade portion is formed so as to be inclined from the inside to the outside in the radial direction toward the one end.

5. 2. The deburring tool according to claim 1, wherein the one end of the deburring blade is formed with an inclined surface that gradually slopes outward in the radial direction of the operating shaft from the one end to the other end.

6. 2. A deburring tool according to claim 1, wherein the other end of said operating shaft is formed with a chucking portion which is detachably held by a chuck of an electric motor.

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