JPH0376608A - Cylinder type hole saw - Google Patents

Abstract

PURPOSE:To easily manufacture a cylinder type hole saws having the sharpness of their blades, being hardly damaged and further being different in size by providing a beltlike base plate to be fixed to a core and a plurality of cutting members containing cutting grains on the end portion of the base plate which is opposite to the core. CONSTITUTION:The core 12 of a cylinder type hole saw 10 has a plurality of protruding parts 14 at one of its end portions extended in an axial direction. A base plate 16 disposed on the core 12 is formed into a beltlike configuration having a plurality of recesses 16a at one of the end portions extended in the axial direction of said base plate, thereby forming a plurality of protrusions 16b. Moreover, cutting members 18 containing cutting grains such as diamond fine particles are formed on the protrusions 16b of the base plate 16, and the base plate 16 having the cutting members 18 are fixed to the core 12 so as to alternately pass through the outer and inner circumferential sides of the protruding parts 14 of the core 12. By this method, the cutting members 18 can be thinned in thickness, and when the cylinder type hole saw is used, a load applied on the cutting members can be reduced to improve the sharpness of the their blades. Further, cylinder type hole save different in size can be easily manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a cylindrical hole saw, and more particularly to a cylindrical hole saw used for drilling holes in, for example, stone.

(Prior Art) FIG. 9 is a perspective view showing an example of a conventional cylindrical hole saw, which is the background of the present invention. The cylindrical hole saw I includes a cylindrical core 2. A plurality of convex portions 3 are formed at one end of the core 2 in the axial direction. These protrusions 3 extend from the ends of the core 2 and are formed at intervals from each other. A cutting body 4 is formed at each end of the convex portion 3 . These cutting bodies 4 are obtained by mixing abrasive grains such as fine diamond particles and metal alloy powder and sintering the mixture into the convex portions 3.

To use such a cylindrical hole saw 1, the core 2
The cutting body 4 is applied to an object to be cut, such as stone, while rotating. Then, a hole is made in stone or the like by the rotating cutting body 4. In this case, the thickness of the cutting body 4 is
It is formed to be larger than the thickness of. By doing this,
The width of the groove in the stone cut by the cutting body 4 becomes larger than the thickness of the core 2, and chips such as stone are discharged from the gap created thereby.

(Problem to be Solved by the Invention) Since the thickness of the cutting body is greater than the thickness of the core, when a cylindrical hole saw is used, a large load is applied to each cutting body. As a result, the cylindrical hole saw becomes less sharp.

Furthermore, if the object to be cut, such as stone, is hard, there is a risk that the core will be worn out and damaged by the chips. Therefore, quenching may be considered to increase the hardness of the core, but quenching is difficult if the core is large in size.

Furthermore, in order to form the cutting body on the convex portion of the core, a mold corresponding to the dimensions of the core is required. Therefore, when manufacturing cylindrical hole saws with different dimensions, molds corresponding to the respective dimensions are required, making it difficult to manufacture cylindrical hole saws.

Therefore, the main purpose of this invention is to have good sharpness,
To provide a cylindrical hole saw that is resistant to breakage and that can be easily manufactured into items of different sizes.

(Means for Solving the Problems) The present invention includes a cylindrical core, a plurality of protrusions extending from one end of the core in the axial direction and arranged at intervals, and an outer periphery of the protrusions. A cylindrical hole saw that includes a strip-shaped substrate that alternately passes through the side and inner circumferential side and is fixed to the core, and a plurality of cutting bodies that are formed at the end of the substrate opposite to the core and that contain abrasive grains. .

(Function) The belt-shaped substrate on which the cutting body is formed and the core are formed separately. This strip-shaped substrate is fixed to the core so as to pass alternately along the outer circumferential side and the inner circumferential side of the convex portion of the core.

(Effects of the Invention) According to the present invention, by making the base plate thinner than the core, the cutting body can be made thinner than the conventional one.

Therefore, when using the cylindrical hole saw, less load is applied to the cutting body, and the cutting quality can be improved.

Further, since the substrate is formed in a band shape, it is easy to harden it to increase its hardness, and it is less likely to be damaged by wear caused by chips or the like.

Furthermore, it is only necessary to cut the strip-shaped substrate to an appropriate length according to the size of the core and attach it to the core, making it easy to manufacture cylindrical hole saws of different sizes. Moreover, regardless of the size of the cylindrical hole saw, the cutting bodies only need to be formed at the same spacing on the strip-shaped substrate; unlike conventional cylindrical hole saws, many cutting bodies can be formed in order to form cutting bodies of different sizes. Does not require a mold.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

(Embodiment) FIG. 1 is a perspective view showing an embodiment of the present invention. This cylindrical hole saw 10 includes a core 12.

As shown in FIG. 2, the core 12 has a plurality of convex portions 14 formed at one end in the axial direction. These convex portions 14 are
They extend from the end of the core 12 and are spaced apart from each other.

A substrate 16 is attached to the core 12 . As shown in FIG. 3, the substrate 16 is formed into a band shape of, for example, steel. A plurality of notches 16a are formed at one end in the width direction of the substrate 16, thereby forming a plurality of protrusions L6b.
is formed. The hardness of the substrate 16 is increased by hardening it.

A cutting body 8 is formed on the protrusion 16b of the substrate 16. The cutting body 18 is produced, for example, by sintering a mixture of 1 to 50% by volume of fine diamond particles, 30 to 50% of copper powder, 30 to 50% of iron powder, and 5 to 10% of tin powder. It is formed on the substrate 16.

The substrate 16 on which the cutting body 18 is formed is connected to the convex portion 1 of the core 12.
4 is fixed to the core 12 so as to alternately pass through the outer circumferential side and the inner circumferential side of the core 12. Therefore, the substrate 16 is attached so as to meander between the protrusions 14 of the core 12, as shown in FIG. In this case, the substrate 16 may be formed by being bent in a meandering manner in advance, as shown in FIG. In this way, as shown in FIG.
6 easily fits into the protrusion 14 of the core (2).

Further, as shown in FIG. 7, the convex portions 14 of the core 12 may be formed alternately closer to the outer circumference and closer to the inner circumference. In this way, the substrate 16 can be easily attached to the core 12 without forming a bent portion as shown in FIG.

When using this cylindrical hole saw 10, the cutting body 18 is applied to a workpiece such as stone while rotating the core 12. At this time, since the cutting body 18 contacts the workpiece while rotating, the workpiece is cut by the cutting body 18 . Since the cutting body 18 is attached to the core 12 in a meandering manner, the width of the groove formed in the workpiece is
This is the width between the outer circumferential side and the inner circumferential side of the cutting body 18. Therefore, the width of the groove formed on the workpiece is
8, and chips can be easily discharged to the outside.

Since the cutting body 18 is formed on the thin substrate 16 made of steel or the like, the thickness can be reduced compared to the cutting body of a conventional cylindrical hole saw.

Therefore, when the cylindrical hole saw 10 is used, the load applied to the cutting body 18 is reduced, and its sharpness is improved.

In addition, by hardening the substrate 16, the substrate 16 can be hardened.
hardness can be increased. Therefore, the substrate 16 is less likely to be damaged by wear caused by chips from the workpiece.

Further, the cutting body 18 is formed on a band-shaped substrate 16, and the substrate 16 is cut into an appropriate length depending on the size of the core 12. Therefore, depending on the size of the core 12, the cutting body 1
There is no need to prepare a mold for forming the hole saw 8, and the cylindrical hole saw 10 can be manufactured easily.

This cylindrical hole saw can be used not only to make holes in stones, but also to make cylindrical stones.

In the above embodiment, a cylindrical core was used, but as shown in FIG. 8, a core 12 having a shaft 20 may also be used. If such a core 12 is used, the cylindrical hole saw 10 can be easily fixed to a machine by gripping the shaft 20 with a chuck or the like.

Further, in the above embodiment, fine diamond powder was used as the abrasive grains used in the cutting body, but other abrasive grains such as cubic boron nitride (CBN) may also be used.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention. 2 is a perspective view showing an example of a core used in the cylindrical hole saw shown in FIG. 1. FIG. 3 is a perspective view showing an example of a substrate used in the cylindrical hole saw shown in FIG. 1. FIG. FIG. 4 is a plan view of the cylindrical hole saw shown in FIG. 1. FIG. 5 is a plan view showing a modification of the substrate shown in FIG. 3. FIG. 6 is a plan view showing essential parts of a cylindrical hole saw using the substrate shown in FIG. 5. FIG. FIG. 7 is a plan view showing a main part of a modification of the core shown in FIG. 2. FIG. FIG. 8 is a perspective view showing another embodiment of the core shown in FIG. 2. FIG. 9 is a perspective view showing an example of a conventional cylindrical hole saw, which is the background of the present invention. In the figure, 10 is a cylindrical hole saw, 12 is a core, 1
4 is a convex portion, 16 is a substrate, and 18 is a cutting body.

Claims (1)

[Scope of Claims] A cylindrical core, a plurality of protrusions extending from one end of the core in the axial direction and arranged at intervals from each other, alternating outer and inner circumferential sides of the protrusions. A cylindrical hole saw comprising: a band-shaped substrate passing through the substrate and fixed to the core; and a plurality of cutting bodies containing abrasive particles formed at an end of the substrate opposite to the core.