JPH0716886B2 - Cutting whetstone with protrusion - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cutting grindstone used for cutting a rigid material such as a stone material. More specifically, the present invention relates to a cutting whetstone with protrusions provided with a cutting blade portion having a large number of protrusions formed on both side surfaces.

(Background of the Invention) Conventionally, a cutting grindstone of a rim type, a segment type or the like has been generally used in a cutting technique for a rigid material such as a stone material.

By the way, the rim type is one in which a cutting blade portion thicker than the base body is continuously welded to the edge of the metal base body,
Since the cutting blade is thicker than the base body, the base body does not come into contact with the material to be cut during the cutting work, and the cutting work can be performed smoothly. However, during the cutting process, chips are smoothly discharged, the cutting blade is clogged,
The sharpness of the cutting blade tends to deteriorate, and it is difficult to supply cooling water between the cutting blade and the material to be cut, so the cutting blade and the material to be cut become hot, and each is affected by heat. There are problems such as abrasion and short life, and the cut surface of the material to be cut becomes discolored or brittle, which makes it difficult to form a good cut surface.

On the other hand, the segment type has a segmented cutting blade welded to the edge of the base body, and compared to a rim type cutting grindstone, the gap between the segments facilitates the discharge of chips and the supply of cooling water. Therefore, the cutting blade portion is less likely to be clogged, the sharpness is maintained for a long time, the cutting process can be performed with high cutting efficiency, the thermal influence is small, and the life is maintained for a long time. Further, the material to be cut has a cut surface that is less discolored or brittle due to thermal influence. However, the cutting efficiency and the life are not always practically sufficient.

(Object of the Invention) The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to cut a material to be cut with high cutting efficiency, long life, and no thermal influence. It is to provide a cutting whetstone with a protrusion that can be performed.

(Structure of the Invention) According to the present invention, by providing a large number of protrusions on both side surfaces of the cutting blade portion, the heat radiation area of the cutting blade portion is widened, and between the cutting blade portion and the material to be cut during cutting. A gap is formed so that chips can be easily discharged and cooling water can be easily supplied.

That is, the structural feature of the present invention is that a plurality of projection groups including a plurality of projections are provided on both side surfaces of the cutting blade portion.

(Example) An example of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing a part of a disc-shaped cutting grindstone, where 1 is a cutting grindstone, 2 is a steel base, and 3 is a cutting blade portion welded to the outer peripheral edge of the base 2.

The cutting blade portion 3 is prepared by mixing natural abrasive grains such as diamond, aluminum oxide-based, silicon carbide-based, etc. or artificial abrasive grains or abrasive grains mixed with these, and a powder metal binder such as nickel alloy, copper or tin. The raw material of the blade portion is fired by heat compression as described later.

On both side surfaces 4 and 5 of the cutting blade portion 3, as shown in FIG.
The protrusion group 6, the second protrusion group 7, and the third protrusion group 8 are formed concentrically. The first projection group 6 is a projection group formed on the outermost periphery, and each projection 6a, 6b of the projection group 6 is formed in a hemispherical shape, and then the top and the outer peripheral edge are sharpened to form a substantially truncated cone shape. And it is formed in a half-divided shape. The second projection group 7 is a projection group formed in the middle, the third projection group 8 is a projection group formed on the inner circumference, and the projections 7a, 7b, 8 of the projection groups 7, 8 are
The a and 8b are formed in a hemispherical shape, and then, the tops are sharpened in a substantially flat shape to form a substantially truncated cone shape.

In addition, each of the protrusions 6a, 6b, 8 of the first protrusion group 6 and the third protrusion group 8
a and 8b are arranged on the same line in the radial direction, and the protrusions 7a and 7b of the second protrusion group 7 are not on the same line but on different lines, that is, the first and third protrusion groups 6 and 8. Each protrusion 6a,
They are arranged at the intermediate positions of 6b, 8a, and 8b. Furthermore, the first to third projection groups 6, 7, 8 formed on both side surfaces 4,5,
As shown in FIGS. 1 and 2, the protrusions of the protrusion group corresponding to each other are arranged at positions different from the symmetrical positions.
That is, the protrusions 6a, 7a, 8a of the protrusion groups 6, 7, 8 formed on the one side face 4 are the protrusions 6b of the corresponding protrusion groups 6, 7, 8 formed on the other side face 5. , 7b, 8b are arranged at positions corresponding to the gap.

Reference numeral 9 is an attachment hole for attaching the cutting grindstone 1 to a spindle (not shown).

Next, a method of manufacturing the disc-shaped cutting grindstone 1 shown in FIGS. 1 and 2 will be described based on the manufacturing process shown in FIG.

First, as shown in FIG. 3, the base body 2 and the cutting blade portion 3 are integrated by cold compression molding, and compression-molded into the primary product 1a of the cutting wheel shown in FIG. That is, a blade formed by arranging the substrate 2 in the center of a fixed mold 10 made of a casting and stirring and mixing finely pulverized diamond abrasive grains and a finely divided metal binder made of copper and tin at a predetermined ratio. The raw materials for the parts are uniformly inserted along the outer peripheral edge of the base 2, and the movable mold 11 is pressurized with a high pressure to be compression-molded into the primary product 1a.

Then, the primary product 1a is heated and compression-molded as shown in FIG. 3 to be the secondary product 1b shown in FIG.
That is, hemispherical recesses 12b, 13b are formed on the respective mold surfaces 12a, 13a of the upper mold 12 and the lower mold 13 so as to correspond to the cutting blade portion 3 of the cutting grindstone 1 to be molded. , 13 to 600 ~ 800 ℃
And the hemispherical protrusions 6c, 6d, 7 on both side surfaces 4 and 5 of the cutting blade portion 3 by applying a pressure lower than that in the above process.
The secondary product 1b on which c, 7d, 8c and 8d are formed is compression molded.

After that, the secondary product 1b is the outer peripheral portion and both side surfaces of the cutting blade portion 3.
4 and 5 are sharpened by a sander (not shown)
The final product 1c as shown in Figure 1
The cutting whetstone 1 shown in the figure is finished.

The present embodiment is configured as described above, and by providing a large number of protrusions 6a, 6b, 7a, 7b, 8a, 8b on both side surfaces 4 and 5 of the cutting blade portion 3, for example, the following effects Can play.

(A) The radiating area of the cutting blade portion 3 is large and the heat radiating property is good, and during the cutting process, a gap is formed between the side surfaces 4 and 5 of the cutting blade portion 3 and the material to be cut, and the cooling water is Since it is smoothly supplied between the cutting blade portion 3 and the material to be cut, the temperature rise of the cutting blade portion 3 is suppressed, deterioration of the cutting blade portion 3 due to the temperature rise is prevented, and it can be used for a long time. On the other hand, the material to be cut is cut into a good cut surface without being thermally influenced by the temperature rise.

(B) During the cutting process, chips are smoothly discharged due to the gap formed between the side surfaces 4 and 5 of the cutting blade 3 and the material to be cut, and the cutting blade 3 is clogged. And the sharpness is maintained for a long time, and each protrusion 6a, 6b, 7a, 7b, 8a, 8b
As a result, an intermittent impact force is applied to the material to be cut, so that the material can be cut efficiently.

(C) The projections 7a, 7b of the second projection group 7 are arranged in a staggered manner, that is, at an intermediate position between the projections 6a, 6b, 8a, 8b of the adjacent first and third projection groups 6, 8 Therefore, as shown in FIG. 1, a gap C between the protrusions forms a continuous gap C in an oblique direction, and chips and cooling water are smoothly discharged or supplied through the gap C during cutting. It is possible to further prevent clogging of the cutting blade portion 3 and increase in temperature, and to suppress the thermal influence of the material to be cut to a low level.

(D) As shown in FIGS. 1 and 2, the protrusions 6a, 6b, 7a, 7b, 8a, 8b of the protrusion groups 6, 7, 8 on the both side surfaces 4,5 are different from each other from the symmetrical position. For example, the protrusions 6a on one side surface 4 are arranged at positions corresponding to the gaps between the protrusions 6b on the other side surface 5, and the gap portions C on both side surfaces 4 and 5 are formed so as not to coincide with each other. Therefore, during the cutting process, the impact force acting on each protrusion does not simultaneously concentrate on the symmetrical positions on both side surfaces 4 and 5 of the cutting blade portion 3, and the stress concentration portion on the cutting blade portion 3 does not occur. Therefore, during the cutting process, the cutting blade 3
It can be used for a long period of time with little risk of breaking.

(E) Each of the protrusions 6a, 6b, 7a, 7b, 8a, 8b is a hemispherical body whose top portion is formed into a substantially flat surface, and is formed in a shape surrounded by a curved line, without sharp corners. Since the impact force during cutting is dispersed, it is less likely to be damaged and can be used for a long time.

(F) Since the radiating area of the cutting blade portion 3 is wide and the radiating property is good, the cutting process can be performed by a dry method almost in the same manner as when using cooling water.

The present invention is not limited to this embodiment, but may be a segment type or the like, and each protrusion may be formed in a truncated cone shape, a prismatic shape, or the like.

(Effects of the invention) As described in the embodiments, the present invention forms a group of protrusions on both side surfaces of a cutting blade portion, so that the cutting blade portion and the material to be cut are cut during cutting. Since a gap is formed in the gap, the chips are smoothly discharged, the cutting blade portion is not clogged, and the sharpness is maintained for a long time. In addition, the cooling water is supplied smoothly, and the heat dissipation area of the cutting blade is large and the heat dissipation is good, so the temperature of the cutting blade and the material to be cut are prevented from rising and may be thermally affected. Less and deterioration is prevented. Further, since the cutting blade portion has a large heat dissipation area and good heat dissipation, it is possible to perform a dry cutting process without using cooling water.

[Brief description of drawings]

1 is a partial plan view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a manufacturing process drawing of the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Cutting grindstone, 2 ... Base | substrate, 3 ... Cutting blade part, 4,5 ... Each side of cutting blade part, 6,7,8 ... 1st-3rd projection group, 6a, 6b, 7a, 7b, 8
a, 8b ... Each projection of the first to third projection groups 6, 7, 8 and C ... Gap.

Claims (5)

[Claims] 1. A cutting grindstone provided with a metal base and a cutting blade welded to an edge of the base and having a thickness larger than that of the base, wherein a plurality of protrusions are provided on both side surfaces of the cutting blade. A cutting whetstone with projections, characterized in that a plurality of projection groups are provided. 2. Each of the projection groups is composed of a plurality of projections arranged in a row and formed in parallel with each other, and each projection of every other projection group is located at an intermediate position of each projection of an adjacent projection group. The cutting whetstone with protrusions according to claim 1, which is arranged. 3. The projections formed on both side surfaces of the cutting blade portion, wherein the projections of the projections corresponding to each other are arranged at positions different from symmetrical positions. Cutting whetstone with protrusion as described. 4. The cutting whetstone with protrusions according to claim 1, wherein each of said protrusions is formed in a truncated cone shape or a substantially truncated cone shape having a top portion of a hemispherical body as a plane. 5. The cutting whetstone with protrusions according to claim 1, wherein the base is a disk-shaped body.