JPH0446760A - Chamfering tool - Google Patents

Abstract

PURPOSE:To perform chamfering or burr removal certainly and quickly and enhance the operating efficiency by furnishing a cutting edge at a part, at least, of a hook formed at the tip of a rotary shank part. CONSTITUTION:A chamfering tool 1 is taken out, and the tip of its rotary shank part 6 is chucked by a motor-driven rotation drive apparatus 5. After the tool 1 is loaded on the apparatus 5 in this manner, the tip of a hook part 7 of the tool 1 is inserted in an above situated hole 3 as shown by a two-dot chain line, and a rotation is made in the direction of the arrow so that the hook part 7 can turn around the tip part 14 of an upper situated mating piece 11, which is followed by a downward movement. Thereby the rotary shank part 6 of the chamfering tool 1 is located in a position approx. identical to the center of the hole 3, and cutting edges 9, 10 formed at this hook 7 are put in condition being in contact with the inside corner C2 of another hole 4 situated below. Then the rotation drive apparatus 5 is operated, and the tool 1 is rotated round the axis of its shaft 6, and thus the corner C2 is machined with the cutting edges 9, 10.

Description

[Detailed description of the invention] a. Industrial application field The present invention is directed to chamfering (spot boring, deburring, etc.) of the openings of holes, screw holes, etc. formed by mechanical processing. This relates to a chamfering tool used for chamfering.

b. Conventional technology When chamfering (or deburring) the mouth of a hole formed in a workpiece, a rotating tool such as a chamfering drill having a diameter slightly larger than the diameter of the hole to be machined is used. used. However, as shown in FIG. 7, in the case of a workpiece 24 in which openings 2223 are formed in a pair of opposing pieces 20 and 21, chamfering may not be performed using a commonly used drill or the like. That is, if the holes 22 and 23 are formed on the same axis, for example, insert a drill or the like into one hole 22 and drill into the other hole 2.
The inner mouth (corner) C2 of the hole 3 is chamfered, but the diameters of the holes 22 and 23, D, are the same, or the diameter D1 of one hole 22 is the diameter of the other hole 23. the law of nature.

When the diameter of the hole 22 is smaller than , it is impossible to insert a chamfering drill or the like having a diameter larger than the diameter of the hole 22 into the hole 22, so it is impossible to chamfer the hole 23. Further, even if the axes of the holes 22 and 23 are deviated, chamfering cannot be performed using a normal drill or the like.

Therefore, in the past, a workpiece 2 of a special shape as shown in FIG.
In case 4, attach a small grindstone (commonly known as a Bosch grinder) to the electric drive tool and manually cut the opening 22.23.
Inner mouth C1, C! In the case of small-volume production, chamfering was performed using primitive methods such as manual sanding or paper finishing.

However, the reality is that such primitive manual methods have extremely low productivity and processing accuracy.

Therefore, as an improvement measure, chamfering is performed using a special unit type chamfering tool 25 as shown in FIG. This chamfering tool 25 includes a rotary power source 26 such as a drilling machine, a chain (or belt) unit 27 that is rotationally driven by the rotary power source 26, and a truncated conical shape that is rotationally driven by the chain unit 27. Cutter (
or a small grindstone) 28, and when chamfering, the cutter 28 and the chain unit 2
7 is inserted between the pair of opposing pieces 20.21 of the workpiece 24, and the cutter 2 is rotated to chamfer the inner opening C1C2 of the opening 22.23.

C9 Problem to be Solved by the Invention However, when using the special unit-two chamfering tool 25 as described above, although the productivity is relatively high, the cutting part of the chamfering tool 25, that is, the chain unit 27 Since it is large enough to accommodate one end portion and the cutter 28, the piece 2 facing the workpiece 240 is
If the length between 0.21 and the length from the center line of the opening 22.23 to the side surface 29 between the opposing pieces 20.21 is short, chamfering cannot be performed. There was a major problem in that the instrument 25 could not be applied to extremely narrow places due to restrictions on the dimensions L+ and Lx.

The present invention has been made in view of these circumstances, and its purpose is to be able to easily and efficiently chamfer a workpiece while having a simple configuration.
Moreover, it is an object of the present invention to provide a practical chamfering tool that can reliably perform chamfering in narrow places.

d. Means for Solving the Problems In order to achieve the above-mentioned object, the present invention includes a rotating shaft portion that is rotationally driven around an axis, a hook portion formed at the tip of the rotating shaft portion, and a hook portion formed at the tip of the rotating shaft portion. , and a cutting edge provided on at least a portion of the hook portion to form a chamfering ζ tool.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 6.

FIG. 1 shows a workpiece 2 being chamfered using a chamfering tool 1 according to the present invention.
This figure shows a situation in which the openings 3 and 4 are chamfered. The above-mentioned chamfering tool 1 is used by being removably chaffed on an electric rotary drive device 5,
It is made by bending and forming a single rod-shaped or wire-shaped steel material. That is, as shown in FIGS. 1 to 3, the chamfering tool 1 of this example has a straight rotary shaft portion 6 whose one end is chaffed by a rotary drive device 5 and driven to rotate about the axis. , and a hook portion 7 formed at the other end (tip) of the rotating shaft portion 6, and the lower portion of the hook portion 7 is bent into a substantially V-shape.

The bent portion 8a of this V-shaped portion 8 is disposed on an extension of the axis of the rotating shaft portion 6, and is a part of the V-shaped portion 8 of the hook portion 7 (reference numeral in FIG. 3). The parts indicated by a and b) are cut with a cutting edge 9.1 by grinding, etc.
0 is formed respectively.

Note that the shape of the cutting edge 9.10 may be any shape as long as it has a sharp edge, for example, the shape shown in FIG. 4 (A), (B) or (C). It is configured. Further, in the case of processing such as deburring, if the outside of the V-shaped portion 8 is sharp, it can be used without any special modification.

On the other hand, as shown in FIGS. 1 and 2, the workpiece 2 to be chamfered has a pair of opposing pieces 11.1 on the workpiece body 2a.
2, and also has openings 3 and 4 corresponding to each other in the pair of opposing pieces 11 and 12.

In addition, the diameter of the openings 3 and 4 is D, and the pair of opposing pieces 1
1 and 12 is A, and the distance from the central axis of the openings 3 and 4 to the side surface 13 between the pair of opposing pieces 11 and 12 is B,
The width W+ (see FIG. 2) of the hook portion 7 of the chamfering tool 1 for chamfering the opening 4 is the diameter D of the opening 4.
8 plus the amount of chamfering, and the distance WZ(
(see FIG. 2) has a chamber sized so as to clear the tip portion 14 corresponding to the opening 3 of the opposing piece 11. Note that the tool for chamfering the opening 3 is also molded to meet such size and shape constraints.

Next, the operating procedure and operation when chamfering the hole 4 of the workpiece 2, that is, cutting the corner C8 at the inner mouth of the hole 4 using the chamfering method 1 of this example, will be explained. 9 First, take out the chamfering tool 1 and insert the rotating shaft part 6 of this tool.
The tip portion of the is chucked to the electric rotary drive device 5. After attaching the chamfering tool 1 to the rotary drive device 5 in this way, insert the tip of the hook portion 7 of the chamfering tool 1 into the upper opening 3 as shown by the two-dot chain line in FIG. , the upper opposing piece 11 is rotated in the direction of the arrow so that the hook 7 can wrap around the tip 14, and then moved downward. As a result, the rotating shaft part 6 of the chamfering tool 1 is placed at a position that almost coincides with the center of the upper opening 3, and the cutting edge part 9810 formed on the hook part 7 is placed inside the opening 4 of the lower ji. Bring it into contact with the corner C2.

Thereafter, the rotary drive machine H5 is switched to the operating state to rotate the chamfering tool 1 around the axis of the rotary drive shaft 6, and the cutting blades 9 and 10 are pressed against the corner C2, thereby cutting this corner. The portion C2 is cut using the cutting edge portion 9.10 to complete the predetermined chamfering process.

After the chamfering process is completed, the chamfering tool 1 is removed from the workpiece 2 through the upper opening 3 in a reverse operation to that described above. Further, the chamfering of the other opening 3 is similarly performed using a dedicated or shared chamfering tool.

In addition, do not press the workpiece 2 toward the chamfering tool 1.
The chamfering process may also be performed by.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and various modifications and changes can be made based on the technical idea of the present invention.

For example, the shape of the hook portion 7 of the chamfering tool 1 can be configured as shown in FIGS. 5(A), 5(B), or 5(C) as required. Further, the rotation driving means for the chamfering tool 1 is not limited to an electric type, but can be manually operated using a handle 16 as shown in No. 61D (A), a grip 1'7 as shown in Fig. 6 (B), etc. It is also possible to perform chamfering T by rotating the chamfering tool 1.As described above, the present invention provides a hook portion at one end of the rotating shaft portion and a cutting edge attached to the hook portion. Since it is designed to have a section, it is possible to perform chamfering and deburring in places where general drill-shaped tools or special tools cannot be used (for example, extremely narrow places). . Moreover, according to the chamfering tool according to the present invention, chamfering or deburring can be performed quickly and reliably, and work efficiency can be improved.

Further, since the chamfering tool of the present invention has a simple structure, it can be easily and inexpensively manufactured to be suitable for the work to be chamfered, and is very practical.

[Brief explanation of the drawing]

Figures 1 to 6 are for explaining the present invention in detail, and Figure 1 is a front view showing a situation in which a hole in a workpiece is chamfered using a chamfering tool according to the present invention. figure,
Figure 2 is an enlarged cross-sectional view of the main parts of the same as above, Figure 3 is a front view of the chamfering tool, and Figures 4 (A), (B) and (C) are the cutting edges formed in the hook part of the chamfering tool. 5 (A), (B) and (C) are front views showing modified examples of the hook part of the chamfering tool, respectively. Figure 6 (A) is a front view showing a manual handle attached to the chamfering tool, and Figure 6 (8) is a front view showing the chamfering tool equipped with a manual grip.
FIG. 7 is an explanatory diagram showing a conventional example. 1... Chamfering IM, 2... Work, 3.
4...Blooming, 6...Rotating shaft part, 7.
...Hook part, 9.10...Cutting blade part, 11
, 12... Opposing piece. (A) Figure 5 (B) Figure 6 (C) Figure 7

Claims (1)

[Claims] A chamfering tool comprising a rotating shaft portion that is rotationally driven around an axis, a hook portion formed at the tip of the rotating shaft portion, and a cutting edge portion provided on at least a portion of the hook portion. .