JPH0751286Y2 - Thin core bit with excellent vibration sound absorption - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention is applicable to concrete structures,
The present invention relates to a thin-walled core bit that is excellent in absorbing vibration noise when making holes in hard structural materials such as stone materials and other hard and brittle materials.

[0002]

2. Description of the Related Art Conventionally, when drilling holes in hard structural materials such as concrete structures, stone materials and other hard and brittle materials,
A thin core bit in which a plurality of ultra-hard drilling tips are arranged in the circumferential direction of the end of a cylindrical base metal is used. As a material for the ultra-hard tip for boring used for this bit, it is general to use a plurality of tips formed by dispersing ultra-hard abrasive grains such as diamond abrasive grains in a metal.

[0003]

However, in the past, no matter what kind of tip material is used, when drilling a hole in the hard structural material, not only the drilling noise but also the vibration noise of the base metal resonates. However, there is a problem in that a large noise is generated and the working environment is significantly deteriorated. Furthermore, there is a problem that the cutting edge is damaged or the work material is damaged due to vibration.

Therefore, an object of the present invention is to provide a thin-walled core bit which is excellent in absorbing vibration noise and which solves the above-mentioned problems by attaching a sheet-shaped damping material to the side surface of the base of the thin-walled core bit. .

[0005]

In order to achieve the above object, the present invention provides a hole in a hard structural material having a plurality of ultra-hard drilling tips arranged in the circumferential direction of the end of a cylindrical base metal. In a thin core bit for drilling, a sheet-shaped damping material is attached to the side surface of the base metal at a position as close as possible from the ultra-hard tip for drilling, and further, a sheet-shaped damping material is
A groove is formed on the side surface of the base metal according to the width and the thickness of the sheet, and the sheet is stuck in the groove.

[0006]

According to the present invention, since the sheet-shaped damping material is attached to the side surface of the base metal as close as possible to the ultra-hard tip for drilling, vibration occurs when drilling holes in the hard structural material. Even if sound is generated, the vibration damping material absorbs and attenuates the resonance sound,
Remarkably noise is prevented. In addition, by forming a groove corresponding to the width and thickness of the sheet when sticking, and sticking in the groove, it is possible to perform stable drilling work without peeling even during drilling.

[0007]

1 is an overall perspective view showing an embodiment of the core bit of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG.
Is a base for thin core bits, usually made of ordinary steel, 2
Is a super-hard tip for drilling, which is formed by sintering diamond abrasive grains to a predetermined size. In this embodiment, a plurality of base chips are attached by brazing in the circumferential direction of the end of the base metal 1. 3 is a sheet-shaped damping material for absorbing vibration sound. In this embodiment, a tape-shaped damping material is used as the sheet-shaped damping material 3 and is placed at a position as close as possible to the ultra-hard tip 2 for drilling. It is attached to the side surface of the base metal 1. 4 is a seam of the tape. Here, the sheet-shaped damping material is attached to the side surface of the base metal 1 at a position as close as possible to the drilling ultra-hard tip 2 because the closer it is to the ultra-hard tip 2, the more the vibration sound is absorbed. Is higher, and the further it is, the less effective it is. Therefore, the area to be attached may be an appropriate area depending on the vibration damping effect and economy. When attaching the damping material, the groove 5 is formed on the side surface of the base metal according to the width and thickness of the sheet or tape, and the damping material is attached in this groove. As a result, the sheet or tape is not peeled off even during drilling, and stable drilling work can be performed. When forming the groove 5, the width or thickness of the sheet or tape should be set so that it will not be too deep to reduce the strength of the base metal, and conversely it will not be peeled off due to friction with the work material because it is too shallow. A groove corresponding to the above is formed, and the groove is attached in the groove. In this case, it is preferable that the sheet-shaped or tape-shaped damping material is attached without protruding from the surface of the base metal 1. By doing so, even if the material of the target work material changes during drilling, or even if the frictional force during drilling becomes large, it becomes possible to make it more difficult to peel off, and more stable Drilling work can be performed. However, depending on the thickness of the sheet-shaped or tape-shaped damping material, the groove 5 may be omitted and the vibration damping material may be directly attached to the side surface of the base metal.

FIG. 3 is an explanatory view showing the damping material 3 used in the present invention, and shows a sheet-like or tape-like material in which the viscoelastic material 6 is applied to the hard sheet 7. In the embodiment, as the viscoelastic material 6, a viscoelastic material 6 formed of a polymer material that converts vibration energy into heat energy and absorbs vibration noise and noise is used. Sheet, which was applied to an aluminum plate in the example was used.

FIG. 4 is an overall perspective view showing another embodiment, in which a tape-shaped damping material 3 is used and is attached in a spiral shape along the direction of rotation of the core bit indicated by the arrow in the figure. It is a thing. As a result, the seam of the tape is reduced, and the tape does not peel off from the seam even if it slides on the work material during drilling.

FIG. 5 is an overall perspective view showing still another embodiment, and FIG. 6 is a sectional view taken along line BB. In this embodiment, when a tape-shaped damping material is attached in a spiral shape as the sheet-shaped damping material 3, a groove 5 is formed in accordance with the thickness and width of the tape so that it is more difficult to peel off. A damping material is attached in the groove. In this case, it is similar to the above-described embodiment that the sheet-like or tape-like damping material is preferably attached without protruding from the surface of the base metal 1. As a result, even more stable drilling work can be performed.

[0011]

EFFECTS OF THE INVENTION According to the present invention, it is easy and easy to drill a hole in a hard structural material by simply attaching a sheet-shaped damping material at a position as close as possible to the ultra-hard tip for drilling. Noise can be prevented. In addition, when sticking, a groove corresponding to the width and thickness of the sheet is formed, and since the groove is stuck in the groove, it does not peel off during drilling, and stable drilling work can be performed.

[Brief description of drawings]

FIG. 1 is an overall perspective view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an explanatory view of a sheet-shaped damping material used in the present invention.

FIG. 4 is an overall perspective view of another embodiment of the present invention.

FIG. 5 is an overall perspective view of another embodiment of the present invention.

FIG. 6 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 1 base metal 5 groove 2 chip 6 viscoelastic material 3 damping material 7 hard sheet 4 seam

Claims (2)

[Scope of utility model registration request] 1. A thin-walled core bit for making a hole in a hard structural material having a plurality of ultra-hard drilling tips arranged in the circumferential direction of an end of a cylindrical base metal, wherein the ultra-hard drilling tip is provided. A thin-walled core bit with excellent absorption of vibration sound, which is characterized by sticking a sheet-shaped damping material on the side surface of the base metal as close as possible. 2. The sheet-shaped damping material according to claim 1, wherein a groove corresponding to the width and thickness of the sheet is formed on the side surface of the base metal, and the groove is attached in the groove. Thin wall core bit with excellent absorption.