Deburring tools

Abstract

To provide a deburring tool capable of grinding a cutting edge while maintaining the shape of the cutting edge when the cutting edge is worn. [Solution] The deburring tool 1 includes a handle 2 provided on a rotation axis A and a cutting portion 3 extending from the handle 2 onto the rotation axis A. The cutting portion 3 includes three blades 30 arranged circumferentially along the axial direction of the rotation axis A, each blade arcing radially outward. The blades 30 are shaped like an oval arc and comprise a first cutting portion 31 with an arc-shaped tip end, a second cutting portion 32 with an arc-shaped tip end on the handle 2 side, and a cutting edge 33 connecting the first cutting portion 31 and the second cutting portion 32. When the first cutting portion 31 and the second cutting portion 32 are ground, the cutting edge length Y of the cutting edge 33 is shortened, but the cutting edge width W of the first cutting portion 31 and the second cutting portion 32 is not reduced. Therefore, when the deburring tool 1 is ground, the shapes of the first cutting portion 31 and the second cutting portion 32 are maintained.

Description

[Technical Field]

[0001] The present invention relates to a deburring tool for removing burrs generated on a workpiece during cutting processing. [Background technology]

[0002] Conventionally, as a deburring tool for removing burrs generated on a workpiece during cutting, a deburring tool having a cutting tool portion is described in the following Patent Document 1. The cutting tool portion of Patent Document 1 has a groove provided in a direction parallel to the rotation central axis, cutting parts provided around the groove, and a guide surface that is a surface provided along the circumference of the cutting tool portion and is provided between the cutting parts formed at different positions. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-2618 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional deburring tool described in Patent Document 1 has a cutting edge that is located around the groove, and therefore the cutting edge cannot be ground while maintaining its shape. When the cutting edge wears down with use, it becomes difficult to use the tool as a deburring tool, and the tool becomes disposable.

[0005] The present invention has been made in consideration of the above points, and aims to provide a deburring tool that can grind the cutting edge while maintaining its shape when the cutting edge becomes worn. [Means for solving the problem]

[0006] The deburring tool according to the embodiment of the present specification includes: A deburring tool for drilled holes, comprising a handle portion provided on a rotary shaft and a cutting portion extending from the handle portion onto the rotary shaft, The cutting portion includes a blade that arcs radially outward along the axial direction of the rotation shaft, The blade is characterized by its oval arc shape consisting of an arc-shaped first cutting edge at the tip, an arc-shaped second cutting edge at the handle, and a base of the blade that joins the first cutting edge and the second cutting edge.

[0007] According to the deburring tool of the embodiment of the present specification, the first cutting edge can cut burrs on the front side of a drilled hole formed in a workpiece, and by inserting the cutting part of the deburring tool tip-first into the drilled hole, the second cutting edge can cut burrs on the back side of the drilled hole. When the first and second cutting edges wear, they can be ground in opposite directions, and because there is a cutting base connecting the first and second cutting edges, the first and second cutting edges can be ground while maintaining their shape without shortening their radial width.

[0008] Here, the deburring tool may be configured so that two or three blades are provided in the circumferential direction of the rotation shaft.

[0009] This allows the deburring tool to have excellent cutting properties.

[0010] In the above deburring tool, the length of the cutting edge in the axial direction may be 0.5 to 5 times the length of the first cutting edge or the second cutting edge in the axial direction.

[0011] This allows the deburring tool to grind the cutting edge while maintaining the shape of the cutting edge, and also makes it easy to handle. [Effects of the Invention]

[0012] According to the deburring tool of the present invention, when the cutting edge is worn, it is possible to grind the cutting edge while maintaining the shape of the cutting edge. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a perspective view of a deburring tool according to an embodiment of the present invention; [Figure 2] FIG. 2 is a front view of the deburring tool with a partially enlarged view. [Figure 3] 1A and 1B are diagrams illustrating how to use the deburring tool, where (A) shows how to remove burrs from the outer surface of a drilled hole formed in a workpiece, and (B) shows how to remove burrs from the inner surface of a drilled hole. [Figure 4] 1A and 1B are diagrams illustrating the ground state of the deburring tool, where (A) is a partial front view of the tool in an unused state, (B) is a partial front view of the tool after the first grinding, and (C) is a partial front view of the tool after the second grinding. DETAILED DESCRIPTION OF THE INVENTION

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A deburring tool 1 according to the present invention will be described below with reference to the accompanying drawings. The scope of the present invention is not limited to the scope disclosed in the embodiments.

[0015] A deburring tool 1 according to the embodiment has a handle 2 attached to a chuck of a rotary tool (not shown), and as shown in Fig. 3, is a tool that cuts and removes burrs B generated in a drilled hole H formed in a workpiece P. As shown in Figs. 1 and 2, the deburring tool 1 includes a handle 2 on a rotation axis A and a cutting part 3 that extends from the handle 2 to the tip on the rotation axis A. The deburring tool 1 rotates around the rotation axis A, causing the cutting part 3 to cut and remove burrs B.

[0016] In this specification, the orientation of the deburring tool 1 is such that the side on which the cutting part 3 is provided is the top and the opposite side on which the handle part 2 is provided is the bottom, as shown in Figures 1 and 2. In the drawings, U indicates top and D indicates bottom. Also, the orientation may be expressed as radially inward or radially outward relative to the rotation axis A of the deburring tool 1.

[0017] The size of the deburring tool 1 is determined by the size of the drill hole H from which the burrs B are to be cut and removed. In the embodiment, the cutting edge width W (radius of the cutting portion 3) of the deburring tool 1 is set to ¼ (±20%) of the diameter of the drill hole H.

[0018] The cutting section 3 is used to cut and remove burrs B, and is composed of three blades 30. The three blades 30 are shaped like oval arcs along the axial direction of the rotation axis A, are arranged at equal intervals in the circumferential direction of the rotation axis A, and each arc of the oval arc shape faces radially outward.

[0019] 1 and 2, the blade 30 has a vertical shape that forms an arc that extends radially outward from top to bottom along the rotation axis A, and is composed of an arc-shaped first cutting edge 31 on the tip side, an arc-shaped second cutting edge 32 on the handle 2 side, and a blade base 33 that joins the first cutting edge 31 and the second cutting edge 32. In each blade 30, the first cutting edge 31, the second cutting edge 32, and the blade base 33 are integrally formed.

[0020] The circumferential direction of the blade 30 in the cutting portion 3 has cutting edges 31a, 32a that cut burrs B on the counterclockwise side when viewed from above, and ridges 31b, 32b that form the spine of the blade on the clockwise side. Therefore, in the deburring tool 1 of the embodiment, the burrs B can be cut and removed by rotating the deburring tool 1 counterclockwise when viewed from above.

[0021] When the first cutting portion 31 and the second cutting portion 32 wear during use of the deburring tool 1, the first cutting portion 31 and the second cutting portion 32 can be ground in opposite directions. As shown in FIG. 4 , the vertical length of the cutting base 33 of each of the first cutting portion 31 and the second cutting portion 32 is shortened by grinding them. However, because the cutting base 33 is integrally formed between the first cutting portion 31 and the second cutting portion 32, the cutting width W of the first cutting portion 31 and the second cutting portion 32 is maintained without being reduced from before grinding. Therefore, the deburring tool 1 maintains the shapes of the first cutting portion 31 and the second cutting portion 32 even when the first cutting portion 31 and the second cutting portion 32 are ground. In this embodiment, the vertical cutting base length Y ( FIG. 2 ) of the cutting base 33 is twice the vertical cutting length X of the first cutting portion 31 or the second cutting portion 32.

[0022] The material of the material forming the deburring tool 1 can be any material used for general drill bits, and in this embodiment, high-speed steel (high-speed tool steel) is used as the material forming the deburring tool 1. The deburring tool 1 can be manufactured using the same manufacturing method as that for general cutting tools.

[0023] The cutting portion 3 of the deburring tool 1 can be coated to improve wear resistance, and in the embodiment, the cutting portion 3 of the deburring tool 1 is coated with TiAlN.

[0024] Next, a method for removing burrs B generated in a drilled hole H formed in a workpiece P using the deburring tool 1 will be described. The deburring tool 1 of the embodiment is suitable for removing burrs from a workpiece in which burrs B cannot be removed from the inner surface, such as a hollow tubular workpiece P shown in FIG.

[0025] The deburring tool 1 is attached to a rotary tool (not shown) and rotates around a rotation axis A to cut and remove burrs B. Burrs B occurring on the outer surface of the workpiece P can be cut and removed from the outer surface by the first cutting edge 31 at the upper tip of the cutting part 3 of the deburring tool 1, as shown in FIG. 3(A). Burrs B occurring on the inner surface of the workpiece P can be cut and removed from the inner surface by inserting the cutting part 3 of the deburring tool 1 through a drill hole H and cutting the burrs B with the second cutting edge 32 at the lower side of the cutting part 3, as shown in FIG. 3(B).

[0026] When the first cutting edge 31 and the second cutting edge 32 of the deburring tool 1 are worn down by repeated deburring, the cutting performance can be restored by grinding the first cutting edge 31 and the second cutting edge 32 in opposite directions. By grinding the first cutting edge 31 and the second cutting edge 32, the blade 30 is shortened such that the first cutting edge 31 is shortened downward and the second cutting edge 32 is shortened upward.

[0027] The deburring tool 1 of the embodiment has a vertical cutting edge 33 between the first cutting edge 31 and the second cutting edge 32. Therefore, as shown in FIG. 4 , when the first cutting edge 31 and the second cutting edge 32 are ground, the cutting edge length Y of the cutting edge 33 is shortened (Y → Y1 → Y2). However, the provision of the cutting edge 33 prevents the cutting edge width W of the first cutting edge 31 and the second cutting edge 32 from being reduced. In other words, the first cutting edge 31 and the second cutting edge 32 can be ground while maintaining their shapes. Therefore, the deburring tool 1 of the embodiment can recover its deburring cutting performance by grinding the first cutting edge 31 and the second cutting edge 32.

[0028] The cutting portion 3 (the first cutting edge 31 and the second cutting edge 32) can be ground using a general-purpose processing machine. Examples of general-purpose processing machines include a universal tool grinder (manufactured by Makino Milling Machinery Co., Ltd.) and a CNC tool grinder (manufactured by ANCA (Australia)).

[0029] The deburring tool 1 of the embodiment can also be implemented in the following forms.

[0030] In the embodiment of the deburring tool 1, the cutting portion 3 has three blades 30, but the cutting portion 3 may have two or three blades 30. This allows the deburring tool 1 to have a simple shape and excellent cutting performance. If the cutting portion 3 has fewer than two blades 30 (one blade), the deburring tool 1 will be poorly circumferentially balanced, which may result in poor cutting performance. On the other hand, if the cutting portion 3 has more than three blades 30 (four or more blades), the structure of the cutting portion 3 will be complex, and the deburring tool 1 may be poorly machinable during production.

[0031] In the deburring tool 1 of the embodiment, the vertical basin length Y ( FIG. 2 ) of the blade base 33 is twice the vertical blade length X of the first blade portion 31 or the second blade portion 32. However, the basin length Y may be 0.5 to 5 times the blade length X. This is because the deburring tool 1 maintains its deburring performance and ease of handling even when the first blade portion 31 or the second blade portion 32 of the cutting portion 3 is ground. If the basin length Y is less than 0.5 times the blade length X, grinding the first blade portion 31 or the second blade portion 32 will also grind the blade base 33, reducing the blade width W of the first blade portion 31 or the second blade portion 32. This may make it difficult to maintain the deburring performance of the deburring tool 1. On the other hand, if the basin length Y is more than 5 times the blade length X, the cutting portion 3 will be too long in the vertical direction, which may reduce the ease of handling of the deburring tool 1. In another embodiment, the blade base length Y can be set to be 1 to 3 times the blade length X.

[0032] In the deburring tool 1 of the embodiment, high-speed steel (high-speed tool steel) is used as the material for forming the deburring tool 1, but the material for forming the deburring tool 1 is not limited to high-speed steel, and for example, cemented carbide (tungsten carbide, titanium carbide, etc.), ceramics, PCD, CBN, etc. can also be used. The material for forming the deburring tool 1 can be selected depending on the material of the workpiece P as the cutting material.

[0033] In the deburring tool 1 of the embodiment, a TiAlN coating is applied to the cutting portion 3 of the deburring tool 1 in order to improve the wear resistance. The coating applied to the cutting portion 3 is not limited to a TiAlN coating, and coatings such as TiN, TiAlSiN, DLC, and diamond can also be used.

[0034] In the deburring tool 1 of the embodiment, the circumferential shape of the blade 30 in the cutting portion 3 has cutting edges 31a and 32a on the counterclockwise side and ridges 31b and 32b on the clockwise side when viewed from above, but it may also have cutting edges 31a and 32a on the clockwise side and ridges 31b and 32b on the counterclockwise side when viewed from above. In this case, the deburring tool 1 can be used by rotating it clockwise when viewed from above. [Explanation of symbols]

[0035] 1 Deburring tool 2 Handle 3 Cutting part 30 blade 31 1st blade part 31a cutting edge 31b peak 32 2nd blade part 32a cutting edge 32b peak 33 Blade base A rotation axis B Bali H Drill Hole P Workpiece W Blade width X Blade length Y Blade length

Claims

1. A deburring tool for drilled holes, comprising a handle portion provided on a rotary shaft and a cutting portion extending from the handle portion onto the rotary shaft, The cutting portion includes a blade that arcs radially outward along the axial direction of the rotation shaft, The blade has an oval arc shape consisting of an arc-shaped first cutting edge portion on the tip side, an arc-shaped second cutting edge portion on the handle side, and a blade base portion joining the first cutting edge and the second cutting edge.

2. The deburring tool according to claim 1, wherein two or three blades are provided in the circumferential direction of the rotation shaft.

3. The deburring tool according to claim 1 or 2, characterized in that the axial length of the blade base is 0.5 to 5 times the axial length of the first blade portion or the second blade portion.

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