JP2001347421A - Circular saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circular saw capable of maximally straightly discharging the divided chips in the cutting direction when dividing a machining material by chip dividing grooves by being shaven out by respective cemented carbide tips. SOLUTION: In this circular saw forming blade bodies at a prescribed pitch in the circumferential direction in an outer peripheral edge part of a disk-like circular saw body, respectively installing the cemented carbide tips 3 on the respective blade bodies, forming the chip dividing grooves 5 in the cutting direction of the cemented carbide tips 3 on flank reliefs 4 of the respective cemented carbide tips 3 and having respectively chamfering parts 10 in width directional both edge parts of the respective flank reliefs 4, inner wall surfaces 16 of the respective chip dividing grooves 5 have a pair of opposed straight line-shaped inclined faces 16a and 16a inclining by a specific angle β to a virtual vertical plane P orthogonal to the groove width direction, and the respective straight line-shaped inclined faces 16a are formed in the same inclination as an inclination α of the chamfering parts 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circular saw in which blades are formed at a predetermined pitch in the circumferential direction on an outer peripheral edge of a circular saw main body, and a carbide tip is attached to each blade.

[0002]

2. Description of the Related Art In a circular saw of this type, a groove for dividing chips is formed on a flank of each carbide tip along a cutting direction of the carbide tip, and each flank has both ends in the width direction both ends. Some have a chamfer. Forming a chip dividing groove on the flank surface of a carbide tip is because if the chip is cut from the work material by a wide width, the chip is likely to adhere to the chip, and This is because the chip separation is caused by the chip separation groove formed on the flank surface of the chip, thereby causing the chip width to be narrowed.

FIG. 8 shows a portion of a carbide tip 13 attached to a conventional circular saw, (A) is a plan view of the portion of the carbide tip 13 and (B) is a side view. A chip dividing groove 15 having an arc-shaped cross section (or a U-shaped groove) is formed in the flank 14 of each carbide chip 13 in the cutting direction of the chip 13. Also,
Both end portions in the width direction of the flank 14 are chamfered at, for example, 45 ° to form chamfered portions 20, 20. In this kind of circular saw, a carbide tip 13 in which a chip dividing groove 15 is formed at a position deviated from the center portion O in the width direction of the flank 14 toward one end thereof, and a center portion O in the width direction of the flank 14 are provided. And the carbide tips 13 having the chip dividing grooves 15 formed at positions deviated to the other end side are alternately arranged in the circumferential direction of the circular saw.

[0004]

By the way, in the conventional circular saw, the chip dividing groove 15 formed on the flank 14 of each carbide tip 13 as described above has an arc-shaped or U-shaped groove in cross section. Each of the carbide tips 13 is formed with a chamfered portion 20 having an inclination angle α of, for example, 45 ° at both ends in the width direction of the flank 14, and both the chip dividing groove 15 and the chamfered portion 20 are formed. Since the cutting edge portion is formed, the chamfer angle α of the chamfer portion 20 and the inclination angle β at which the inner wall portion 15a of the chip dividing groove 15 is inclined with respect to the virtual vertical plane P orthogonal to the groove width direction. If there is a large difference between the chips, the work material W is cut out by
When divided by 5, each of the divided chips has a large difference in cutting resistance between both end portions, and the divided chips bend in the direction of smaller cutting resistance.

That is, in this case, the inclination angle α of the chamfered portion 20 is 45 °, while the inner wall portion of the chip dividing groove 15 is inclined with respect to a vertical plane P orthogonal to the groove width direction. is 0 ° to 10 °, and the difference between the inclination angle α of the chamfered portion 20 and the inclination angle β of the inner wall portion of the chip dividing groove 15 is as large as 35 ° to 45 °. A large resistance difference is generated between both end portions. However, since the cutting resistance of the workpiece W with respect to the chip 13 is smaller on the chamfered portion 20 side with a large inclination angle than on the inner wall portion side of the chip dividing groove 15, the divided chips bend greatly toward one chamfered portion 20 side. Would. If the chip thus bent is bent, the chip comes into pressure contact with the work surface of the work material W, causing problems such as damaging the work surface and impairing the product value.

According to the present invention, when a work material is cut by each carbide tip and divided by a chip dividing groove, the divided chips can be discharged as straightly as possible along the cutting direction. It is an object of the present invention to provide a circular saw.

[0007]

The invention according to claim 1 is
Blades 2 are formed at a predetermined pitch in the circumferential direction on the outer peripheral edge of the disk-shaped circular saw main body 1, and each blade 2 has a carbide tip 3.
A chip dividing groove 5 is formed in the flank face 4 of each carbide tip 3 in the cutting direction of the carbide tip 3, and each flank face 4 has a chamfered portion 10 at both widthwise edges. In the saw, the inner wall surface 16 of each chip dividing groove 5 has a pair of opposed linear inclined surfaces 16a, 16a inclined at a fixed angle β with respect to an imaginary vertical plane P orthogonal to the groove width direction. The inclined surface 16a is formed to have the same inclination angle as the inclination angle α of the chamfered portion 10 or an inclination angle not much different therefrom.

According to a second aspect of the present invention, the inner wall surface 16 of the chip dividing groove 5 has a pair of opposed straight lines inclined symmetrically at the same angle β with respect to a virtual vertical plane Po passing through the center in the groove width direction. It is characterized by having the inclined surfaces 16a, 16a.

[0009]

FIG. 1A is an enlarged front view showing a part of a circular saw according to the present invention, and FIG. 1B is an enlarged plan view.
In this circular saw, blades 2 are formed at a predetermined pitch in a circumferential direction on an outer peripheral edge of a disk-shaped circular saw main body 1, and a carbide tip 3 is attached to each blade 2. In the circular saw, the flank 4 is provided with a chip dividing groove 5 formed along the cutting direction of the cemented carbide tip 3 as shown in FIG. Chip 3 in which a chip dividing groove 5 is formed at a position eccentric to one end side from the center portion O in the direction, and a chip dividing groove 5 at a position eccentric from the center portion O in the width direction of the flank 4 to the other end. Are alternately arranged in the circumferential direction of the circular saw main body 1.
In the drawing, reference numeral 6 denotes a blade bottom of the blade body 2 and 7 denotes a back portion.

FIG. 2 is an enlarged view of the cemented carbide tip 3, (A) is a front view in a used state, (B) is a plan view,
(C) is a side view. FIG. 3 is a further enlarged view of FIG. In these figures, reference numeral 8 denotes a first rake face formed adjacent to the front edge of the flank 4, and reference numeral 9 denotes a concave rake face formed on the front surface of the carbide tip 3 a adjacent to the first rake face 8. The 2 rake faces 10 are chamfered portions formed by chamfering both edges of the flank 4 at 45 °.

As can be seen from FIG. 3, the chip dividing groove 5 of each carbide tip 3 is formed by a virtual vertical plane P passing through the center in the groove width direction.
a pair of opposed linearly inclined surfaces 16 each having an inverted C-shaped cross section, which are symmetrically inclined at a constant inclination angle β with respect to o.
a, 16a, and an inner wall surface 16 formed by a groove bottom surface 16b having an arc-shaped cross section connecting the lower ends of the two linear inclined surfaces 16a, 16a. The depth of the chip dividing groove 5 is 0.
It is about 15 to 0.25 mm. As shown in FIG. 3, the angle β between the virtual vertical surface Po passing through the center in the groove width direction and each linear inclined surface 16a of the inner wall surface 16 is orthogonal to the groove width direction and the virtual vertical surface The angle formed between the virtual vertical plane P parallel to Po and each of the linear inclined surfaces 16a is also the same angle β, and the angle β formed between the virtual vertical plane P and each linear inclined surface 16a is the flank surface. 4 is 45 °, which is the same as the inclination angle α of the chamfered portions 10 formed at both end edges.

That is, each carbide tip 3 of the circular saw 1 has a chamfering angle α of a chamfered portion 10 formed at each end of the flank 4 and a straight inclined surface 16 a of the chip dividing groove 5. Has the same angle as the inclination angle β inclined with respect to the virtual vertical plane P orthogonal to the groove width direction. The groove bottom surface 16b of the inner wall surface 16 of the chip dividing groove 5 is formed in an arc-shaped cross section as shown in FIG. 3, but instead of such an arc-shaped groove bottom surface 16b, FIG. It may be formed on a flat groove bottom surface 16b 'like the inner wall surface 16 of the chip dividing groove 5 shown. Further, the chip dividing groove 5 may be formed in a V-shaped cross section.

When cutting the work material W by attaching the circular saw constructed as described above to a required cutting machine, first, FIG.
2 (A) and 2 (B), the chips M cut from the first rake face 8 are cut off by the flank face 4 as shown in FIG. The chip is divided into two in the chip width direction by a chip dividing groove 5 located at a position eccentric to one end side from the width direction center portion O to form divided chips m ₁ and m ₂ as shown in FIG. At this time, on the work material W side from which the chip M has been cut, the convex streak 1 corresponding to the chip dividing groove 5 is provided.
1 is formed. FIG. 5A shows a convex streak 11 formed on the work material W side, and FIG. 5B shows a divided chip m ₁ in which a chip M is divided into two by a chip dividing groove 5. , M ₂
Is shown.

Next, in the cutting by the carbide tip 3 shown in the center of each of FIGS. 1A and 1B, the chips M cut out in the same manner as described above are moved to the center of the flank 4 in the width direction. Part O
The chip is divided into two by a chip dividing groove 5 located at a position eccentric from the other end to the other end to form divided chips m ₁ and m ₂ as shown in FIG. At this time, on the surface side of the chip M cut out by the carbide tip 3, a convex streak 11 due to the chip dividing groove 5 of the preceding carbide tip 3 is formed. Chip separation groove 5 at a position away from convex streak 11
Is divided into _two chips m ₁ and m ₂ . At this time, a ridge 11 corresponding to the chip dividing groove 5 is formed on the side of the workpiece W from which the chip M has been cut. FIG. 6 (A)
FIG. 1B shows a ridge 11 formed on the workpiece W side, and FIG. 2B shows divided chips m ₁ and m ₂ obtained by dividing a chip M into two by a chip dividing groove 5.

Subsequently, in cutting with the carbide tip 3 shown on the right side of each of FIGS. 1A and 1B, the chip N to be cut is replaced with the case of the carbide tip 3 shown on the left side of FIG. Similarly, the chip is divided into two in the chip width direction by a chip dividing groove 5 located at a position eccentric to one end side from the width direction central portion O of the flank 4 to form divided chips m ₁ and m ₂ as shown in FIG. I do. On the surface side of the chip M cut by the carbide chip 3, a convex streak 11 is formed by the chip dividing groove 5 of the carbide chip 3 preceding the chip M. Thus, the chip N
Is also divided into two chips m ₁ and m ₂ by the chip dividing groove 5 at a position apart from the convex streak 11. FIG. 7A shows a convex streak 11 formed on the workpiece W side, and FIG. 7B shows a divided chip m ₁ , in which a chip M is divided into two by a chip dividing groove 5. shows the m _2.

In FIG. 2A, t is the cut amount of the work material W by one carbide tip 3 and is based on the depth of the chip dividing groove 5 (about 0.15 to 0.25 mm). 0.1m
m or less. As described above, since the cut amount of the work material W is smaller than the depth of the chip dividing groove 5, the tip of each convex streak 11 is flat as shown in FIGS.

As described above, in the circular saw 1, the inner wall surface 16 of the chip dividing groove 5 has an inverted C-shaped cross section at a constant angle β with respect to a virtual vertical plane Po passing through the center O in the groove width direction. The linearly inclined surfaces 16a, 16a are inclined at an angle, and the inclination angle β of each linear inclined surface 16a is formed at the same angle as the inclination angle α of the chamfered portion 10. When being cut out by the chip 13 and divided by the chip dividing groove 15, each divided chip m ₁ , m ₂ divided respectively
There is no resistance difference between the two end portions of each of the above, so that each of the divided chips m ₁ and m ₂ is discharged straight while maintaining the straightness along the cutting direction, and damages the work material W. Without, product quality is maintained.

In the circular saw 1, the inclination angle β of the linear inclined surface 16a forming the inner wall surface 16 of the chip dividing groove 5
Is most preferably formed at the same angle as the inclination angle α of the chamfered portion 10 formed at each end portion in the width direction of the flank 4, but the inclination angle α of the chamfered portion 10 and the Even if the inclination angle β of the linear inclined surface 16a of the groove 5 is slightly different, that is, even if there is an angle difference of about 10 ° to 15 ° between the inclination angle α and the inclination angle β, the work material W There is not much difference in resistance between both ends of each of the divided chips m ₁ , m ₂ which are cut out and divided by the chip dividing groove 15, so that the divided chips m ₁ , m ₂ are substantially in the cutting direction. The straightness can be maintained along.

In this embodiment, the inner wall surface 16 of each chip dividing groove 5 is formed by a virtual vertical plane P passing through the center in the groove width direction.
has a pair of linear inclined surfaces 16a, 16a inclined in the shape of an inverted C in cross section at the same inclination angle β with respect to o. One inclined angle of the pair of linear inclined surfaces and the other It may be formed so that the inclination angle of the inclined surface is different. However, forming as in this embodiment is more natural and advantageous in terms of manufacturing.

[0020]

According to the first aspect of the present invention, a pair of circular saws, the inner wall surfaces of the chip dividing grooves provided on the flank of the carbide tip, are inclined at a fixed angle with respect to an imaginary vertical plane orthogonal to the groove width direction. Since the linear inclined surface is formed at the same angle as the inclined angle of the chamfered portion or at an angle which is not much different from the inclined angle of the chamfered portion, the work material is cut out by each carbide tip and the chip is divided. When divided by the groove, there is no large difference in resistance between the two side ends of each of the divided chips, so that each of the divided chips is discharged straight while maintaining the straightness in the cutting direction. In addition, the quality of the product can be maintained without damaging the work material.

According to a second aspect of the present invention, the inner wall surface of the chip dividing groove has a pair of opposed linearly inclined surfaces symmetrically inclined at the same inclination angle with respect to an imaginary vertical plane passing through the center in the groove width direction. With the configuration having the surface, the formation of the chip dividing groove becomes easy.

[Brief description of the drawings]

FIG. 1A is an enlarged front view showing a part of a circular saw according to the present invention, and FIG. 1B is an enlarged plan view.

FIG. 2 is an enlarged view of the carbide tip of the circular saw shown in FIG. 1, (A) is a front view in use, (B) is a plan view,
(C) is a side view.

FIG. 3 is an enlarged side view of the carbide tip shown in FIG.

FIG. 4 is a partially enlarged side view of a carbide tip according to another embodiment.

FIG. 5A is a cross-sectional view showing a convex streak formed on a work material, and FIG. 5B is a cross-sectional view showing a divided chip in which a chip is divided into two by a chip dividing groove of one carbide tip. It is.

FIG. 6A is a cross-sectional view showing a convex streak formed on a work material, and FIG. 6B is a cross-sectional view showing a divided chip in which a chip is divided into two by a chip dividing groove of another carbide tip. It is.

FIG. 7A is a cross-sectional view showing a convex streak formed on a work material, and FIG. 7B is a cross-sectional view showing a divided chip in which a chip is further divided into two by a chip dividing groove of another carbide tip. FIG.

FIG. 8A is a plan view showing a conventional circular saw carbide tip, and FIG. 8B is a side view of the tip.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Circular saw main body 2 Blade body 3a, 3b Carbide tip 4 Relief surface 5 Chip dividing groove 8 First rake face 9 Second rake face 10 Chamfered portion 11 Convex streaks M Chips cut by carbide tip m ₁ , m ₂ divided chips O Central portion in the width direction of flank face of carbide tip P Virtual vertical surface orthogonal to width direction of chip dividing groove Po Virtual vertical surface passing through center of chip dividing groove in the width direction 16 Chip dividing groove The inner wall surface 16a The linear inclined surface of the inner wall surface 16b The groove bottom surface of the inner wall α The inclination angle of the chamfered part β The inclination angle of the linear inclined surface

Claims (2)

[Claims] 1. A blade body is formed at a predetermined pitch in a circumferential direction on an outer peripheral edge portion of a disk-shaped circular saw main body, and a carbide tip is attached to each blade body, and a flank of each carbide tip is provided. In a circular saw having chip dividing grooves formed in the cutting direction of the carbide tip and having chamfers at both ends in the width direction of each flank, the inner wall surface of each chip dividing groove is orthogonal to the groove width direction. A pair of opposed linear inclined surfaces inclined at a fixed angle with respect to the virtual vertical surface to be formed, and each linear inclined surface is formed at the same inclination angle as the inclination angle of the chamfered portion or at an inclination angle not much different therefrom. A circular saw characterized by: 2. An inner wall surface of the chip dividing groove has a pair of opposed linear inclined surfaces symmetrically inclined at the same inclination angle with respect to a virtual vertical plane passing through the center in the groove width direction. The circular saw according to claim 1.