JPH07317481A - Blade for cutting tool and cutting tool - Google Patents

Abstract

PURPOSE:To reduce revolving power required for cutting, and to shorten the cutting time by setting the kinds, number, thickness size, etc., of a drill and a bit and cutting both internal and external peripheries of excavation while supplying sections among both internal and external peripheries and an article to be cut with a coolant. CONSTITUTION:The diameter of a drill body 12 and the size and number, etc., of blades 14 are determined in response to the kind of an article to be cut, the scale of drilling, etc., and a binding material is added to the powder of diamond as the bits 14. Each bit 14 is arranged at intervals in the circumferential direction, and mounted on an end face 16 by brazing, etc. Each bit 14 has base sections 18 brought into contact with the end face 16 and front end sections 20 relative to the base sections 18 regarding the axial direction of the main body 12 at that time. The end faces of each base section 18 and each front end section 20 are formed in parallel with each end face 16 of the main body 12, and the end faces of the bit front end sections 20 are cut during a time when the bits 14 are rotated around the axis of the main body 12. The thickness size of the bits 14 is prescribed, annular clearances are formed among both internal and external circumferential surfaces 22, 24 relative in the radial direction of the main body 12 and the article to be cut, and the bits 14 are supplied with a coolant from the clearances.

Description

Detailed Description of the Invention

[0001]

The present invention relates to cutting tools and blades for cutting tools.

[0002]

2. Description of the Related Art Drilling of concrete boards, drilling of rock,
A drill is used to collect a cylindrical sample (core). The drill includes a cylindrical main body, and one or more plate-shaped blades attached to an end surface of the main body and extending in the circumferential direction along the end surface.

Circular saws are used for cutting concrete products, asphalt pavements, stone materials, roof tiles, tiles, bricks, plastic products and the like. The circular saw comprises a disc-shaped main body and one or a plurality of plate-shaped blades attached to the end surface of the main body and extending in the circumferential direction along the end surface.

Conventionally, as a blade of a cutting tool such as a drill or a circle, a grindstone made of a sintered body such as a sintered diamond, a cemented carbide, a ceramic, a resinoid cutting grindstone, an electrodeposition grindstone, etc. has been used. And has a constant thickness dimension.

[0005]

In use, the cutting tool is connected to the rotary drive means via its body and is rotated about its axis by the operation of said rotary drive means. The blade rotated with the main body exerts a cutting action on the object to be cut at its tip surface. According to the conventional cutting tool and blade, since the thickness dimension of the blade is constant,
During cutting, friction is generated between the entire area on both sides of the blade that defines the thickness dimension and the work piece, and due to this frictional action or side resistance, a large amount of power is required to rotate the cutting tool. And also required a long cutting time. It is an object of the invention to improve a cutting tool blade or a cutting tool. Another object of the present invention is to reduce the rotational power required for cutting with a cutting tool or to shorten the time required for cutting.

[0006]

DISCLOSURE OF THE INVENTION The present invention is a cutting tool having a cylindrical main body and one or a plurality of blades attached to an end face of the main body and extending circumferentially along the end face, and a blade thereof. The blade is made of a plate-shaped grindstone whose thickness varies in the axial direction of the main body.

The thickness of the grindstone can be set so as to gradually decrease from the tip of the blade in the axial direction of the main body toward the main body. Moreover, both side surfaces in the radial direction of the main body, which define the thickness dimension of the grindstone, can be set to uneven surfaces coaxial with the peripheral surface of the main body.

The present invention also provides a cutting tool comprising a disc-shaped main body and one or a plurality of blades attached to the peripheral surface of the main body and extending along the peripheral surface, and the blade, wherein the blade is It consists of a plate-shaped grindstone whose thickness varies in the radial direction of the main body.

The thickness of the grindstone can be set so as to gradually decrease from the tip of the blade in the radial direction of the main body toward the main body. Further, both side surfaces in the axial direction of the main body, which define the thickness dimension of the grindstone, can be set to uneven surfaces parallel to the front and back surfaces of the main body.

Further, the intersection of the tip end surface of the grindstone and both side surfaces defining the thickness dimension of the grindstone can be a curved surface.

[0011]

According to the present invention, since the thickness of the blade made of a plate-shaped grindstone is set so as to change with respect to the axial direction of the cylindrical main body, the circumference of the axial line of the main body is reduced. When the blades rotated to cut (perforate) the object to be cut and advance the object, part of both side surfaces defining the thickness dimension of the blade does not contact the object to be cut. Therefore, the friction generated between the blade and the object to be cut is smaller than that in the case where all the both side surfaces of the blade are in contact with each other. Therefore, the magnitude of the driving force required to rotate the cutting tool can be reduced, and the cutting resistance can be reduced and the cutting time can be shortened. Therefore, the cutting tool and the blade thereof of the present invention also represent a substantial improvement over the conventional ones.

Further, if the thickness of the blade is set to gradually decrease from the tip of the blade in the axial direction of the main body toward the main body, at least one of both side surfaces of the blade is substantially cut during cutting. Therefore, it is possible to prevent the object from coming into contact with the object to be cut, and thereby the generated friction can be made smaller. However, according to this, when the blade, that is, the grindstone is worn down by use, there is a difference in perforation diameter before and after the wear. However, if both side surfaces in the radial direction of the main body that define the thickness dimension of the blade are set to a concavo-convex surface that is coaxial with the peripheral surface of the main body, even if the blade wears down due to use, each of the concave surface and the convex surface Perforation diameter is constant.

Further, according to the present invention, since the thickness of the blade made of a plate-shaped grindstone is set to change in the radial direction of the disk-shaped main body, the blade is rotated around the axis of the main body. When the blade cuts an object to be cut and advances the object, part of both side surfaces defining the thickness dimension of the blade does not contact the object to be cut. Therefore, the friction generated between the blade and the object to be cut is smaller than that in the case where all the both side surfaces of the blade are in contact with each other. Therefore, the magnitude of the driving force required to rotate the cutting tool can be reduced, and the cutting resistance can be reduced and the cutting time can be shortened. Therefore, the cutting tool and the blade thereof of the present invention also represent a substantial improvement over the conventional ones.

If the thickness of the blade is set to gradually decrease from the tip of the blade in the radial direction of the main body toward the main body, at least one of both side surfaces of the blade is substantially cut during cutting. In addition, it is possible to prevent the friction from being brought into contact with the object to be cut, and thereby to reduce the generated friction. However, according to this, when the blade, that is, the grindstone is worn down by use, a width dimension of the cutting groove is different before and after the wear. However, if both side surfaces with respect to the axial direction of the main body that define the thickness dimension of the blade are set to uneven surfaces parallel to both surfaces of the main body, even if the blade wears down due to use, the concave surface and the convex surface are each described above. The width dimension of the cutting groove is constant.

If the intersection of the tip surface of the blade and both side surfaces that define the thickness of the blade is set to be a curved surface, for example, the tip surface and each of the both side surfaces intersect at an acute angle. The surface area of the tip face is smaller than that in the case where the cutting is performed. Therefore, at the start of cutting, a cutting mark can be formed on the surface of the object to be cut by the tip face of the rotating blade, and thus the blade can be positioned quickly.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a drill, which is one of the cutting tools, is indicated generally by the numeral 10. The drill 10 is mounted on rotary drive means (not shown) and is rotated about its axis for drilling concrete plates, drilling rock, mining cores, etc.

The drill 10 comprises a cylindrical main body 12 and a plurality of blades (bits) 14 supported by the main body 12.
The diameter of the main body 12 of the drill 10, the size and the number of the blades 14, and the like are determined according to the type of object to be cut, the scale of drilling, and the like. The bit 14 is made of a sintered diamond, cemented carbide, or a sintered stone such as a ceramic, which is obtained by adding powder of metal, carbide, nitride, or the like to a diamond powder as a binder and sintering at high pressure and high temperature. Cutting wheel,
It consists of an electroplated whetstone.

A plurality of bits 14 are provided on the end face 16 of the body 12.
Are circumferentially spaced from each other and are attached to the end surface 16 of the main body 12 by brazing, bonding with an adhesive, or the like. Each bit 14 has a plate shape, more specifically, a curved plate shape, and extends in the circumferential direction along the end surface 16 of the main body 12. Instead of the illustrated example in which a plurality of bits 14 are arranged, a single annular bit can be arranged.

Each bit 14 has a base portion 18 in contact with the end face 16 of the main body 12 and a base portion 18 in the axial direction of the main body 12.
And a tip portion 20 opposed to the. The base portion 18 and the tip portion 20 each have an end surface parallel to the end surface 16 of the body 12, and the end surface of the tip portion 20 of the bit is such that the bit 14 is rotated about the axis of the body 12 to be cut ( It is pressed against (not shown) to exert a cutting action on the object to be cut.

The bit 14 defines its thickness dimension,
It has two side surfaces (an inner peripheral surface and an outer peripheral surface) 22 and 24 facing each other in the radial direction of the main body. The end surface of the base portion 18 of the bit 14 preferably has a width dimension larger than the width dimension of the end surface 16 of the main body 12 (the length dimension in the radial direction of the main body 12), a part of which is away from the end surface 16 of the main body. It protrudes inward and outward in the radial direction of the main body. Due to this protrusion, the diameter of the hole formed in the workpiece by the cutting action of the bit 14 is larger than the outer diameter of the main body 12. Therefore, as the cutting progresses, annular gaps are formed between the inner and outer peripheral surfaces of the body 12 following the bit 14 and the object to be cut, and the bit 1 passes through these gaps.
4 can be supplied with a cooling liquid, and due to these gaps, no friction occurs between the main body 12 and the workpiece.

In the present invention, the thickness dimension of the bit 14 changes in the axial direction of the main body 12. In the example shown in FIGS. 2 and 3, the thickness dimension of the bit 14 is
Is gradually reduced from the tip in the axial direction toward the main body 12. That is, it gradually decreases from the tip portion 20 toward the base portion 18. The example shown in FIG. 2 has a greater degree of gradual decrease in the thickness dimension than the example shown in FIG.

In the illustrated example, the inner peripheral surface 22 and the outer peripheral surface 24 defining the thickness dimension have a tapered shape when viewed in cross section and extend linearly. Instead of the illustrated example, at least one of the inner and outer peripheral surfaces may be set to extend curvilinearly when viewed in cross section.

When the shape of the bit 14 is set in this way, the inner diameter and the outer diameter of the annular hole drilled in the object to be cut by the cutting action at the end face of the tip portion 20 of the bit 14 are the bit respectively. It is smaller than the inner diameter and outer diameter of each portion from the end surface of the tip portion 20 of 14 to the base portion 18. From this, between the inner peripheral surface of the hole, that is, the peripheral surface of the core hollowed from the object to be cut and the inner peripheral surface 22 of the bit 14,
Further, a gap is formed between the outer peripheral surface of the hole and the outer peripheral surface 24 of the bit 14. Due to these gaps, friction between the workpiece and the inner and outer peripheral surfaces 22 and 24 of the bit 14 is prevented from occurring due to the rotational movement of the bit 14. As a result, the rotary driving force of the drill 10 can be reduced, the cutting resistance can be reduced, and the cutting time can be shortened, as compared with the conventional drill and its blade in which friction is inevitable. it can. Further, the cooling liquid can be supplied through the gap.

Instead of the illustrated example, as shown in phantom lines in FIGS. 2 and 3, the outer peripheral surface 24 of the bit 14 or the inner peripheral surface 22 of the bit 14 is coaxial with the inner and outer peripheral surfaces of the body 12. It may be a part of the surface, that is, it may be non-tapered in cross section. According to this, friction does not occur between one of the inner and outer peripheral surfaces 22 and 24 of the bit and the object to be cut during cutting.
As compared with the conventional one, the rotational driving force of the drill 10 can be reduced, the cutting resistance can be reduced, and the cutting time can be shortened.

Further, the end face of the tip portion 20 of the bit 14 and
The curved surface 26 is formed at the intersection of the bit 14 and the peripheral surfaces 22, 24.
Is desirable. By providing the curved surface 26, the surface area of the end surface of the tip portion 20 of the bit 14 or the length dimension of the main body 12 in the radial direction can be reduced as compared with the case where the curved surface 26 is not provided. Therefore, the pressing force of the bit 14 at the start of cutting can be concentrated on the object to be cut, and the annular cutting groove can be formed in the object to be cut in a short time. Therefore, it is easy to position the bit 14 at the drilled portion at the start of cutting. Instead of the example shown, the curved surface 26 can be provided on only one of the two intersections.

Next, referring to FIG. 4, a circular saw, which is one of the cutting tools, is indicated generally by the numeral 30. The circular saw 30 is attached to a rotary driving means (not shown) such as a circular saw board, and is used for concrete products, asphalt pavement,
Used for cutting stone, roof tiles, tiles, bricks, plastic products, etc.

The circular saw 30 comprises a disk-shaped main body 32 and a plurality of blades (segments) 34 supported by the main body 32. The diameter of the main body 32 of the circular saw 30, the size and the number of the segments 34, etc. are determined according to the type of the object to be cut. The segment 34 includes sintered diamond, cemented carbide, which is obtained by adding powder of metal, carbide, nitride or the like to diamond powder as a binder and sintering at high pressure and high temperature.
A grindstone made of a sintered body such as ceramic, a resinoid cutting grindstone, an electrodeposition grindstone, and the like.

The plurality of segments 34 are spaced apart from each other along the peripheral surface 36 of the body 32 and the body 32.
It is attached to the peripheral surface 36 by brazing, bonding with an adhesive, or the like. Each segment 34 has a plate shape and extends in an arc shape along the peripheral surface 36 of the main body 32. Instead of the illustrated example in which the plurality of segments 34 are arranged, one annular segment can be arranged.

Each segment 34 has a peripheral surface 36 of the body 32.
And a tip portion 40 facing the base portion 18 in the radial direction of the main body 32. The base portion 38 and the tip portion 40 each have a circumferential end surface that is coaxial with the circumferential surface 36 of the body 32, and the end surface of the tip portion 40 of the segment is
While the segment 34 is rotated around the axis of the body 32, it is pressed against a work piece (not shown) to exert a cutting action on the work piece.

The segment 34 defines two thickness sides 42, 4 of the body 32 which are axially opposed to each other.
4 (see FIG. 5). The circumferential end surface of the base portion 38 of the segment 34 preferably has a width dimension (a length dimension in the thickness direction or the axial direction of the body 32) larger than the width dimension of the circumferential surface 36 of the body 32, and a part of the width dimension. Body surface 3
6 protrudes from each side of the main body 32. Due to this protrusion, the width dimension of the groove or slit formed when the workpiece is cut by the cutting action of the segment 34 is larger than the thickness dimension of the main body 32. Therefore, during cutting, a gap is formed between each side surface of the main body 32 following the segment 34 and the workpiece, and the coolant can be supplied to the segment 34 through both of these gaps. Because of the gap, no friction occurs between the body 32 and the work piece.

In the present invention, the thickness dimension of the segment 34 changes in the radial direction of the main body 32. In the example shown in FIG. 5 and FIG. 6, the thickness dimension of the segment 34 is the segment 34 in the radial direction of the main body 32.
Gradually decreases from the tip to the main body 32. That is, it gradually decreases from the tip portion 40 toward the base portion 38. Figure 5
In the example shown in (1), the degree of gradual decrease in the thickness dimension is larger than that in the example shown in FIG.

In the illustrated example, both side surfaces 42 and 44, which define the thickness dimension of the segment 34, have a tapered shape in a sectional view and extend linearly. Instead of the illustrated example, at least one of both side surfaces may be set to extend curvilinearly when viewed in cross section.

When the shape of the segment 34 is set in this way, the width dimension of the groove or slit formed on the object to be cut by the cutting action at the circumferential end face of the tip portion 40 of the segment 34 is the tip portion 40. The width is smaller than the width of each part from the end face to the end face of the base portion 38.
As a result, a gap is created between each wall surface that defines the groove or slit formed in the workpiece and each side surface 42, 44 of the segment 34 that faces the wall surface.

Due to the presence of these voids, it is possible to prevent friction between the workpiece and the side surfaces 42 and 44 of the segment 34 due to the rotational movement of the segment 34. As a result, compared to the conventional circular saw and its blade, in which the occurrence of friction was unavoidable, the circular saw 30
The rotational driving force can be reduced, cutting resistance can be reduced, and cutting time can be shortened. Further, the cooling liquid can be supplied through the gap.

Instead of the illustrated example, one of the side surfaces 42, 44 of the segment 34 is parallel to each side surface of the body 32, as shown in phantom in FIGS. 5 and 6, ie,
It is possible to have a non-tapered shape when viewed in cross section. According to this, 4 of both side surfaces of the segment 34 during cutting
Friction does not occur between the other of Nos. 2 and 44 and the object to be cut, which also reduces the rotational driving force of the drill 10 and reduces the cutting resistance as compared with the conventional one.
The cutting time can be shortened.

Further, it is desirable that the intersection of the end face of the tip portion 40 of the segment 34 and the side faces 42, 44 of the segment 34 is a curved face 46. By providing the curved surface 46, it is possible to reduce the surface area or the width dimension of the end surface of the tip portion 40 of the segment 34 as compared with the case where the curved surface 46 is not provided. As a result, the pressing force of the segment 34 at the start of cutting can be concentrated on the object to be cut, and the cutting groove can be formed in the object to be cut in a short time. Therefore, it is easy to position the segment 34 at the cut portion at the start of cutting. Instead of the example shown, the curved surface 46 can be provided on only one of the two intersections.

Both side surfaces 22, 24 of the illustrated blade 14 are symmetrical in cross section and both side surfaces 42, 44 of the blade 34 are also symmetrical in cross section, but instead of the illustrated example, both side surfaces 22,
It is possible to set 24 and the both side surfaces 42, 44 so as to be inclined asymmetrically.

As shown in FIGS. 7 and 8, the blade 1
4 and the respective side surfaces of the blade 34 in cross section, two inclined surface portions 48 and 50 having different inclinations, and both inclined surface 4
8 and 50 in series with the step 52. The step 52 extends parallel to the body end surface 16 for the blade 14 and coaxial with the body circumferential surface 36 for the blade 34. The number of the inclined surface portions may be three or more instead of the example shown.

Further, as shown in FIG. 9 and FIG.
Each side surface of each of the blade 14 and the blade 34 can be configured by a plurality of inclined surface portions 54 to 60 which are continuous in a zigzag when viewed in cross section. However, in the example shown in FIG. 10, a non-inclined surface 62 that is continuous with the inclined surface 54 near the tip is further provided. The inclined surface portion 62 extends in the axial direction of the main body 12 for the blade 14, and the main body 3 for the blade 34.
It extends in the radial direction of 2.

Further, as shown in FIGS. 11 and 12, the respective side surfaces of the blade 14 and the blade 34 can be constituted by uneven surfaces 64 and 66. In the example shown in FIG. 11, each convex surface 66 forms a part of one inclined surface when viewed in cross section. Further, each concave surface 64 is coaxial with the peripheral surface of the main body 12 in the blade 14, and the main surface 3 in the blade 34.
2 extends parallel to the front surface 70 or the back surface 72.

In the example shown in FIG. 12, in addition to the concave surface, the convex surface 66 is also coaxial with the peripheral surfaces 74 and 76 of the main body 12 for the blade 14 and the main body 32 for the blade 34. Extends parallel to the front surface 70 or the back surface 72 of the. According to the blade having the tapered side surface, the use of the blade 1
4, 34, that is, when the grindstone is worn out, there is a difference in the hole diameter and the width dimension of the cutting groove before and after the wear, but in the example shown in FIG. 12, even if the blade is worn out by use. In each of the concave surface 64 and the convex surface 66, the hole diameter and the width dimension of the cutting groove are constant.

The side shapes of the blade shown in FIGS. 7 to 12 are
Instead of the illustrated embodiment applied to both sides of the blade, it can be applied to only one side. Further, the shapes of both side surfaces of the blade shown in FIGS. 7 to 12 may be asymmetrical instead of the illustrated example.

The examples shown in FIGS. 7 to 12 can also reduce the side surface resistance of the blade with respect to the non-cut object at the time of cutting, as compared with the conventional case.

[Brief description of drawings]

FIG. 1 is a perspective view of a drill.

2 is a cross-sectional view of a portion of the body and bit taken along line 2-2 of FIG.

FIG. 3 is a cross-sectional view similar to that shown in FIG. 2 of a portion of the body and another example bit.

FIG. 4 is a perspective view of a circle.

5 is a cross-sectional view of a portion and segment of the body taken along line 2-2 of FIG.

FIG. 6 is a cross-sectional view similar to that shown in FIG. 5 of a portion of the body and another example segment.

FIG. 7 is a cross-sectional view of a portion of another example body and bit or segment.

FIG. 8 is a cross-sectional view of a portion of another example body and a bit or segment.

FIG. 9 is a cross-sectional view of a portion of another example body and bit or segment.

FIG. 10 is a cross-sectional view of a portion of another example body and bit or segment.

FIG. 11 is a cross-sectional view of a portion of another example body and bit or segment.

FIG. 12 is a cross-sectional view of a portion of another example body and a bit or segment.

[Explanation of symbols]

 10 drill (cutting tool) 12 main body 14 bit (blade) 16 end surface of main body 18, 20 bit base and tip 22, 24 bit side surface 26 curved surface 30 circular saw (cutting tool) 32 main body 34 segment (blade) 36 End face of main body 38,40 Base and tip of segment 42,44 Side of segment 46 Curved surface 64,66 Uneven surface

Claims (10)

[Claims] 1. A blade for a cutting tool, which comprises a cylindrical body and one or more blades attached to an end surface of the body and extending in a circumferential direction along the end surface, the blade being in an axial direction of the body. A blade for a cutting tool, which consists of a plate-shaped grindstone whose thickness dimension changes. 2. The blade for a cutting tool according to claim 1, wherein the thickness of the grindstone gradually decreases from the tip of the blade in the axial direction of the main body toward the main body. 3. The blade for a cutting tool according to claim 1, wherein both side surfaces in the radial direction of the main body that define the thickness dimension of the grindstone are uneven surfaces that are coaxial with the peripheral surface of the main body. 4. A cylindrical main body, and one or a plurality of blades attached to an end surface of the main body and extending in a circumferential direction along the end surface, the blade having a thickness dimension varying in an axial direction of the main body. A cutting tool consisting of a plate-shaped grindstone. 5. A blade for a cutting tool comprising a disk-shaped main body and one or a plurality of blades attached to a peripheral surface of the main body and extending along the peripheral surface, the radial direction of the main body. A blade for a cutting tool, consisting of a plate-shaped grindstone whose thickness varies. 6. The cutting tool blade according to claim 5, wherein the thickness of the grindstone gradually decreases from the tip of the blade in the radial direction of the body toward the body. 7. The blade for a cutting tool according to claim 1, wherein both side surfaces in the axial direction of the main body which define the thickness dimension of the grindstone are uneven surfaces parallel to the front and back surfaces of the main body. 8. A disk-shaped main body, and one or a plurality of blades mounted on the peripheral surface of the main body and extending along the peripheral surface, the blade having a thickness dimension varying in the radial direction of the main body. A cutting tool consisting of a plate-shaped grindstone. 9. The blade for a cutting tool according to claim 1, wherein an intersection of a tip end surface of the grindstone and both side surfaces defining a thickness dimension of the grindstone is a curved surface. 10. The cutting tool according to claim 4, wherein an intersection of a tip end surface of the grindstone and both side surfaces defining a thickness dimension of the grindstone is a curved surface.