JP4408157B2 - Deburring grinding tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a deburring grinding tool, and in particular, an improvement of a deburring grinding tool that deburrs a workpiece by bringing a metal wire having a ridge line into sliding contact with the workpiece. About.
[0002]
[Prior art]
FIG. 5 (a) shows this kind of deburring grinding tool. This deburring grinding tool is formed by, for example, bending a piano wire A having a triangular cross-section into two and then caulking its free end into the pipe member B with the central portions bulging each other. It is configured. The pipe member B is a brass pipe, for example, and is a part that functions as a chuck member for a processing machine.
[0003]
In this deburring grinding tool, after being held by a processing machine via a pipe member B, it is inserted into a processing hole of a processing object in a state where it is rotated at a high speed, and a piano wire A is placed on its inner peripheral surface. If the sliding contact is made, the flash generated in the processed hole can be scraped off by the ridgeline of each piano wire A.
[0004]
[Problems to be solved by the invention]
By the way, when the piano wire A having a ridgeline is folded in two as described above, the bent portion C has an acute angle, and therefore there is a possibility that the ridgeline may be damaged such as cracks. ), The leading end of the piano wire A is cut and separated in the manufacturing stage, which is extremely disadvantageous in terms of yield.
[0005]
Moreover, in the deburring grinding tool described above, an extremely large force acts on each piano wire A from the workpiece during processing, and this concentrates on the bent portion C on the distal end side of the piano wire A. It becomes like this. For this reason, even if the piano wire A is not broken at the manufacturing stage, it may be easily broken from the bent portion C described above during processing. If the piano wire A is cut and separated during processing, the deburring process cannot be continued thereafter, so that not only the productivity of the object to be processed is reduced, but also the piano wire A that has been cut and separated. There is even a possibility of damaging the object to be processed at the end of the workpiece.
[0006]
In view of the above circumstances, the present invention solves the problem of providing a grinding tool for deburring capable of improving yield and preventing as much as possible a situation where a metal wire breaks and separates even during machining. Let it be an issue.
[0007]
[Means for Solving the Problems]
The deburring grinding tool of the present invention grinds and removes burrs in a hole or a recess, and has a ridge line having a triangular cross section, a folded metal wire, and the metal wire A first twist coupling portion formed by twisting a proximal end portion, a second twist coupling portion formed by twisting a distal end portion of the metal wire, and the first twist coupling portion and the second twist coupling. It is characterized in that it is composed of a polishing portion which is molded between the two portions and loosely bulges from the both end portions to the central portion in the longitudinal direction .
[0008]
It is preferable that the metal wire is provided with a twist coupling portion at a base end portion thereof and is held by the chuck member via the twist coupling portion. More preferably, the metal wire has a triangular cross section.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
FIG. 1 shows an embodiment of a grinding tool for deburring according to the present invention. In the deburring grinding tool illustrated here, one end portion of a thin metal wire 10 having twist coupling portions 11 and 12 at both ends and arranged so that center portions in the longitudinal direction swell in a circular arc shape are connected to a pipe member. 20 is configured by caulking inside 20. For example, as shown in FIG. 2, the thin metal wire 10 is a piano wire having a triangular cross section, and has three ridge lines 10a on the outer periphery thereof. When the twisted joints 11 and 12 are provided at both ends of the thin metal wire 10, as shown in FIG. 3A, one thin metal wire 10 is first bent into two, and then the bent thin metal wire 10 is bent. Both ends are twisted and combined multiple times. The directions in which the fine metal wires 10 are twisted are preferably opposite to each other so that when one is unraveled, the other is tightened. The pipe member 20 is a metal pipe made of brass or the like that functions as a chuck member for the processing machine, similar to the one shown in FIG. 5A, and the above-described thin metal wire 10 is connected via one twisted coupling portion 12. keeping.
[0010]
In the deburring grinding tool configured as described above, as shown in FIG. 4, after being held by the processing machine via the pipe member 20, as in the conventional tool shown in FIG. 5 (a), If this is inserted into the machining hole 31 of the workpiece 30 in a state where it is rotated at a high speed and the fine metal wire 10 is slidably contacted with the inner peripheral surface thereof, the flash generated in the machining hole 31 will be ridgeline 10a of each fine metal wire 10. Can be scraped off.
[0011]
Here, the deburring grinding tool is provided with a torsion coupling portion 11 in which these are twisted and coupled to the tip end portion of the fine metal wire 10. Therefore, even if the ridgeline 10a is damaged when the metal wire 10 is bent in two, the metal wire 10 is firmly bonded and held through the twisted connection portion 11. This makes it possible to prevent the tip of the metal thin wire 10 from being cut and separated in the manufacturing stage, which is advantageous in terms of yield. In addition, since a separate part for joining the fine metal wires 10 is not required, the manufacturing cost is not increased.
[0012]
Further, the force acting on the tip side of each thin metal wire 10 from the workpiece 30 during the processing is concentrated at the twist start portion 13 separated from the joining start portion of these thin metal wires 10, that is, the bent portion of the thin metal wire 10. It will be. For this reason, even during the processing of the workpiece 30, it remains firmly coupled and held via the torsional coupling portion 11, and the tip end portion of the thin metal wire 10 is not easily cut and separated. As a result, it is possible to continuously perform the deburring process on the workpiece 30 and to improve the productivity thereof, and to process the workpiece due to the cut of the thin metal wire 10. There is no possibility of incurring 30 damage.
[0013]
In the deburring grinding tool, a twisted joint 12 is also provided at the proximal end of the fine metal wire 10, and the proximal end of the fine metal wire 10 is caulked to the pipe member 20 via the twisted joint 12. I am doing so. For this reason, even if the ridge line 10a is damaged such as a crack when the metal thin wire 10 is caulked at the base end portion thereof to the pipe member 20, the metal thin wire 10 is strengthened through the torsion coupling portion 12. Thus, the base end portion of the fine metal wire 10 is not broken and separated in the manufacturing stage. Further, the force acting on the fine metal wire 10 from the workpiece 30 during the machining is the torsion start portion 14 separated from the coupling start portion, that is, the caulking portion with the pipe member 20 also on the proximal end side of the fine metal wire 10. To concentrate on. Therefore, the situation in which the proximal end portion of the fine metal wire 10 is cut and separated does not occur even during processing, and there is no possibility of reducing the productivity of the processing target 30 or damaging the processing target 30. .
[0014]
In the above-described embodiment, a single thin metal wire is first bent into two, and then both ends of the bent thin metal wire are twisted a plurality of times to provide a torsion coupling portion. The invention is not limited to this. For example, as shown in FIG. 3 (b), two fine metal wires 10 'and 10' are prepared in advance, and twisted coupling portions 11 'and 12' are provided by twisting both ends a plurality of times. It is also possible. Similarly, three or more fine metal wires may be prepared and provided with a twisted coupling portion. Furthermore, a thin metal wire with a triangular cross section is applied, but it does not necessarily have to be a triangle as long as it has a ridge line. Other shapes such as those having ridge lines on the surface may be used. In addition, the metal wire is not only arranged so as to be curved in an arc shape so that the central portion in the longitudinal direction swells, but also arranged so that the central portion in the longitudinal direction swells so as to exhibit a plurality of waveforms and a plurality of mountain shapes. It is also possible.
[0015]
【The invention's effect】
As described above, according to the present invention, since the torsional coupling portion is provided at the tip of the metal wire, the metal wire can be firmly coupled and held via this torsional coupling portion. In addition, it is possible to effectively prevent a situation in which the tip end portion of the metal wire is cut and separated in the manufacturing stage, and to obtain advantageous effects such as yield advantages. In addition, since no separate parts for connecting the metal wires are required, the manufacturing cost is not increased.
[0016]
Furthermore, since the force acting on the tip side of the metal wire from the workpiece during processing is concentrated at the twist start portion at the twisted joint, the tip portion of the metal wire is also processed during processing of the workpiece. However, they are not easily separated by cutting, and there is no possibility of reducing the productivity of the workpiece or causing damage due to the cutting of the metal wire.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a deburring grinding tool according to the present invention.
FIG. 2 is a cross-sectional view of a metal wire applied to the deburring grinding tool shown in FIG.
FIGS. 3A and 3B show a twisting method of a metal wire applied to the deburring grinding tool shown in FIG. 1, wherein FIG. 3A is a conceptual diagram when one metal wire is used, and FIG. It is a conceptual diagram at the time of using the metal wire.
FIG. 4 is a conceptual diagram showing how the deburring grinding tool shown in FIG. 1 is used.
FIGS. 5A and 5B show a conventional deburring grinding tool, in which FIG. 5A is a cross-sectional view, and FIG. 5B is a side view showing a state where a tip end portion of a metal wire is cut and separated.
[Explanation of symbols]
10, 10 'Metal thin wire 10a Ridge line 11, 11', 12, 12 'Twist coupling part 13, 14 Twist start part 20 Pipe member 30 Work object 31 Work hole

Claims (1)

In a deburring grinding tool that grinds and removes burrs in holes or recesses,
The cross-section has a ridge line that is a triangle, and one folded metal wire,
A first torsion coupling portion formed by twisting a proximal end portion of the metal wire;
A second twisted coupling portion formed by twisting the tip of the metal wire;
A polishing part that is molded between the first torsional coupling part and the second torsional coupling part and loosely bulges from both ends to the central part in the longitudinal direction;
A grinding tool for deburring, characterized by comprising at least

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