JP2001252903A - Saw blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive saw blade of which the cutting resistance is small, by which a precise cut surface can be obtained, and which is excellent is abrasion-resistance. SOLUTION: A chip 20 is equipped with a top surface 20a and a pair of side surfaces 20b and 20c. In this case, the top surface 20a is constituted of a flat surface which is orthogonal to the central surface 14a of a main body 14. The pair of side surfaces 20b and 20c are symmetrically provided to the central surface 14a of the main body 14. The structure of a chip 22 is approximately the same as that of the chip 20 The effective height h1 of the top surface 20a of the chip 20 is larger than the effective height h2 of the top surface 22a of the chip 22. The effective distance w1 between the pair of side surfaces 20b and 20c of the chip 20 is smaller than the effective distance w2 between the pair of side surfaces 22b and 22c of the chip 22. Thus, a cutting resistance can be reduced. Also, a precise cut surface can be obtained. In addition, the grinding work for the chips 20 and 22 is easy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a saw blade and, more particularly, to a saw blade having a cutting tip connected to a tooth portion.

[0002]

2. Description of the Related Art A tip saw is known as a saw blade for cutting wood or the like. FIG. 5 shows the structure of a conventional tip saw 2.

The tip saw 2 includes a main body 4, teeth 6, and tips 8. The tip 8 is made of a highly wear-resistant alloy or the like, and is brazed to the teeth 6. For this reason, when processing wood etc., there is an advantage that abrasion of the cutting edge is small and a decrease in sharpness can be suppressed.

Further, since the shape of the chip 8 is simple, the cost of polishing the chip 8 can be reduced.

[0005]

However, the conventional tip saw 2 described above has the following problems. In the conventional tip saw 2, usually, the tip 8
(The dimension in the depth direction of the paper in FIG. 5, not shown) is generally set to be the same for each chip 8.

Therefore, when cutting wood or the like, each chip 8 cuts a material corresponding to the thickness of the chip 8, and a large load is applied to the chip 8. For this reason, there was a problem that cutting resistance was large.

In this case, if the thickness of each chip 8 is reduced, the cutting resistance is reduced, but if the thickness of each chip 8 is reduced, the thickness of the main body 4 must also be reduced. In this case, the rigidity of the tip saw 2 is reduced, and deflection, chatter, and the like are likely to occur.

Further, since the thickness of the chip 8 is the same,
Since wood and the like are finished by one cutting, there is also a problem that a surface to be cut of the wood and the like becomes rough.

The present invention solves the problems of the conventional tip saw and the like, and provides an inexpensive saw blade excellent in wear resistance and capable of obtaining a fine work surface with a small cutting resistance. The purpose is to do.

[0010]

Means for Solving the Problems, Functions and Effects of the Invention
The saw blade according to claim 1 is provided with first and second cutting tips as cutting tips, and each of the first and second cutting tips includes a top surface formed of a plane orthogonal to a center plane of the main body,
A pair of side surfaces provided substantially symmetrically with respect to the center plane of the main body, the pair of side faces being formed adjacent to the top surface and configured by a plane substantially parallel to the center plane of the main body,
A rake face formed adjacent to the top face and the pair of side faces, wherein the effective height of the top face of the first cutting tip is higher than the effective height of the top face of the second cutting tip, First
The effective distance between the pair of side surfaces of the cutting tip is smaller than the effective distance between the pair of side surfaces of the second cutting tip.

Therefore, when cutting a work material, first, a cutting process with a narrow cutting width is performed by the first cutting tip,
Thereafter, cutting is performed by the second cutting tip so as to widen the narrow cutting width.

For this reason, the cutting margin of each cutting tip is not so large. Therefore, cutting resistance can be reduced. In addition, since the cutting is performed twice, a dense work surface can be obtained.

Further, since both the top surface and the pair of side surfaces have a simple plane shape, the grinding operation of the cutting tip is easy. Therefore, a saw blade having excellent wear resistance can be realized at low cost. Further, repolishing after manufacturing is easy. Therefore, when the sharpness is reduced by use, the sharpness can be easily recovered by repolishing.

That is, it is possible to realize an inexpensive saw blade excellent in wear resistance and capable of obtaining a dense work surface with a small cutting resistance.

According to a second aspect of the present invention, the rake faces of the first and second cutting tips are both formed by inclined planes which intersect at a constant acute angle with one or the other of the pair of side faces. The rake faces of two adjacent first cutting tips of the first cutting tips are reversed, and the rake faces of two adjacent second cutting tips of the second cutting tips are reversed. The inclination direction is reversed.

Therefore, when cutting the work material, first, the work surface of the work material is alternately and sharply cut by the first cutting tip, and then the second cutting tip is used to increase the narrow cutting width. The work surface of the work material is alternately sharply cut. For this reason, a more precise work surface can be obtained.

Furthermore, the rake face has a constant inclination angle irrespective of the type of cutting tip and the inclination direction of the rake face, so that the polishing operation is easy. Therefore, a saw blade having excellent wear resistance can be realized at low cost. Further, repolishing after manufacturing is easy. Therefore, when the sharpness is reduced by use, the sharpness can be easily recovered by repolishing.

[0018] In the saw blade according to the third aspect, the thickness of at least a portion of the tooth portion to which the first cutting tip is coupled, which is located at a position exceeding the effective height of the second cutting tip, is reduced by the second cutting. The thickness of the tooth to which the tip is to be bonded is thinner,
It is characterized by.

Therefore, for example, even when the effective distance between the pair of side surfaces of the first cutting tip is smaller than the thickness of the main body, at least the second of the teeth to which the first cutting tip is connected. By making the thickness of the portion at a position exceeding the effective height of the cutting tip smaller than the effective distance between the pair of side faces of the first cutting tip, it is possible to avoid interference between the teeth and the work material. Can be.

For this reason, while keeping the thickness of the main body thick,
The effective distance between the pair of side surfaces of the first cutting tip can be reduced. That is, first, it is possible to perform cutting with a considerably narrow cutting width while preventing bending and chatter of the saw blade. For this reason, a cutting surface with smaller cutting resistance and a dense work surface can be obtained.

According to a fourth aspect of the present invention, the first and second cutting tips are arranged substantially alternately on adjacent teeth.

Therefore, even if the feed speed of the saw blade is relatively high compared to the cutting speed of the cutting tip, first the first
It is easy to maintain the order in which cutting with a narrow cutting width is performed by the cutting tip, and then cutting by the second cutting tip is performed so as to widen the narrow cutting width.

That is, even if the feed speed of the saw blade is high, a cutting surface with a small cutting resistance and a dense work surface can be obtained.

According to a fifth aspect of the present invention, the difference between the effective height of the top surface of the first cutting tip and the effective height of the top surface of the second cutting tip is 0.5 mm or more and 5 mm or less, The difference between the effective distance between the pair of side surfaces of the first cutting tip and the effective distance between the pair of side surfaces of the second cutting tip is 0.2 mm or more and 2 mm or less.

Therefore, even if the feed speed of the saw blade is considerably higher than the cutting speed of the cutting tip, first the first
It is easy to maintain the order in which cutting with a narrow cutting width is performed by the cutting tip, and then cutting by the second cutting tip is performed so as to widen the narrow cutting width.

That is, even when the feed speed of the saw blade is considerably high, for example, when processing wood or the like, it is possible to obtain a fine work surface with a small cutting resistance.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a drawing showing the structure of a tip saw 12, which is a saw blade according to an embodiment of the present invention. FIG. 2 is a drawing schematically showing a cross section II-II in FIG. FIG. 3 is a drawing schematically showing a view III in FIG.

As shown in FIG. 1, the tip saw 12 has a metal disk-shaped main body 14 having a mounting hole 14b in the center, and a plurality of teeth 1 protruding from the outer periphery of the main body 14.
6 and 18 are circular saws. The teeth 16, 18
In each case, a chip 20 as a first cutting tip and a chip 22 as a second cutting tip, both made of a wear-resistant alloy or the like, are joined by brazing.

As shown in FIG. 3, the chip 20 is
Top surface 20 composed of a plane orthogonal to the center plane 14a
a, and a pair of side surfaces 20b and 20c provided substantially symmetrically with respect to the center surface 14a of the main body 14. Side 2
Each of Ob and 20c is formed by a plane formed adjacent to the top surface 20a and parallel to the central surface 14a of the main body 14.

The structure of the chip 22 is almost the same as that of the chip 20. However, as often appears in FIG. 2, the effective height h1 of the top surface 20a of the chip 20 is higher than the effective height h2 of the top surface 22a of the chip 22. The effective distance w1 between the pair of side surfaces 20b and 20c of the chip 20 is
Is smaller than the effective distance w2 between the pair of side surfaces 22b and 22c.

Therefore, as described later, when cutting wood as a work material, first, a cutting process with a narrow cutting width corresponding to the effective distance w1 of the chip 20 is performed, and thereafter, the narrow cutting width is expanded. Thus, cutting is performed in accordance with the effective distance w2 of the chip 22.

For this reason, the cutting margin of each of the chips 20 and 22 is not so large. Therefore, cutting resistance can be reduced. In addition, since the cutting is performed twice, a dense work surface can be obtained.

Further, in each of the chips 20, 22, the top surfaces 20a, 22a and the pair of side surfaces 20a, 22a are provided.
Since each of b, 20c and 22b, 22c has a simple planar shape, the work of polishing the chips 20, 22 is easy. In other words, it is possible to perform the polishing work, which generally requires skill and a high cost burden rate, at low cost, and it is possible to obtain the chips 20 and 22 having high dimensional accuracy.

Therefore, a highly accurate tip saw having excellent wear resistance can be realized at low cost.

That is, it is possible to realize an inexpensive tip saw having excellent wear resistance and capable of obtaining a fine work surface with a small cutting resistance.

[0036] As shown in FIG.
A rake face 20d is formed adjacent to the side face a and the pair of side faces 20b, 20c.

The rake face 20d of the chip 20 is formed by an inclined plane that intersects one of the pair of side faces 20b and 20c at a fixed acute angle. Further, the plurality of chips 20 are configured such that the rake faces of two adjacent chips 20 have opposite inclination directions.

The chip 22 is also formed with a rake face 22d similar to the chip 20, and is configured such that, among a plurality of chips 22, the rake faces of two adjacent chips 22 have opposite inclination directions. I have.

Therefore, as described later, when cutting wood, first, the cut surface of the wood is alternately cut by the sharp edges 20e on the left and right sides by the chips 20 having the rake faces 20d having different inclined directions. A rake face 22d having a different inclination direction so as to widen the narrow cutting width.
The cut surface of the wood is cut by the sharp edge 22e alternately on the left and right by the chip 22 having. For this reason, a more precise work surface can be obtained.

Further, since the angle of inclination of the rake faces 20d, 22d is constant irrespective of the type of chip (that is, the chips 20, 22) and the inclination direction of the rake faces 20d, 22d, the polishing operation is easy. That is, while the relationship between the polishing table (not shown) and the grindstone (not shown) is fixed at a fixed angle, the tip
By simply turning over, all the rake faces 20d and 22d can be easily polished.

Further, in this embodiment, as shown in FIG. 2, the thickness t1 of the portion 16a of the tooth portion 16 to which the chip 20 is connected at least at the position exceeding the effective height h2 of the chip 22 is determined. Tooth 1 to which tip 22 is coupled
8 is thinner than the thickness t2.

More specifically, in this embodiment, the effective distance w1 between the pair of side surfaces 20b and 20c of the chip 20 is smaller than the thickness of the main body 14. Even in such a case, the thickness of the portion 16a of the tooth portion 16 to which the chip 20 is coupled at least at the position exceeding the effective height h2 of the chip 22 is determined by the pair of side surfaces 20
By making it thinner than the effective distance w1 between b and 20c, it is possible to avoid interference between the teeth 16a and the wood.

Therefore, the effective distance w1 between the pair of side surfaces 20b and 20c of the chip 20 can be reduced while keeping the thickness of the main body 14 large. That is, it is possible to first perform a cutting process with a considerably narrow cutting width while preventing the tip saw 12 from bending or chattering. For this reason, a cutting surface with a smaller cutting resistance can be obtained.

In this embodiment, the chip 2
0 and chips 22 are alternately arranged on the outer periphery of the main body 14.

Therefore, even if the feed speed of the chip saw 12 is relatively high compared to the cutting speed of the chips 20 and 22 (the peripheral speed of the chips 20 and 22), first,
It is easy to maintain the order in which cutting is performed with a narrower cutting width, and then cutting is performed with the tip 22 so as to increase the narrower cutting width.

That is, even when the feed speed of the tip saw is high, such as when cutting wood, the cutting resistance is small,
In addition, a dense work surface can be obtained.

Although the dimensions of the tip saw 12 according to this embodiment are not particularly limited, for example, the effective height h1 of the top face 20a of the tip 20 and the top face 2 of the tip 22
The difference between 2a and the effective height h2 is preferably 0.5 mm or more and 5 mm or less.

The pair of side surfaces 20b, 2b
0c and a pair of side surfaces 22 of the chip 22
It is preferable that the difference between the effective distance w2 between b and 22c be 0.2 mm or more and 2 mm or less.

In this way, even when the feed speed of the tip saw 12 is considerably higher than the cutting speed of the chips 20 and 22, the cutting with the narrow cutting width is first performed by the tip 20, and then the cutting is performed. It becomes easy to maintain the order in which cutting by the tip 22 is performed so as to widen the narrow cutting width.

That is, even when the feed speed of the tip saw 12 is considerably high, for example, when processing wood or the like, a cutting surface with a small cutting resistance and a dense work surface can be obtained.

The difference between the effective heights h1 and h2 described above is more preferably 0.5 to 4 mm, further preferably 1 to 3 mm, and still more preferably
It can be 1.5-2.5 mm, more preferably about 2 mm.

The difference between the effective distances w1 and w2 is more preferably 0.3 to 1.8 mm, further preferably 0.5 to 1.5 mm, and still more preferably 0.7 to 1.5 mm. ~ 1.3 mm, more preferably about 1 mm.

As an example of the present embodiment, for example, each dimension is 180 mm in outer diameter (that is, h1 = 90 mm), h2 = 88 mm, and 2.2 mm in thickness of the main body 14 (that is, t2).
= 2.2 millimeters), t2 = 1.5 millimeters,
w1 = 2 mm, w2 = 3 mm, number of teeth 4
A woodworking chip saw such as 0 (the same number of chips 20 and chips 22) is used.

Next, based on FIGS. 4A to 4C,
The manner in which the tip saw 12 cuts the wood 80 will be described.

First, as shown in FIG.
The two chips 20 (see FIG. 2) make it possible to
2 is cut to form a concave portion 84.

Thereafter, when the tip saw 12 is sent in the X1 direction relative to the wood 80, as shown in FIG.
The chip 22 (see FIG. 2) allows the cut surface 86 of the recess 84 to be formed.
A new work surface 88 is formed so as to finish. At this time, a new concave portion 90 is formed by the chip 20.

By continuously performing such an operation, a new work surface 88 and a concave portion 90 are sequentially formed, and the state shown in FIG. 4C is reached. In time, the wood 80 is cut into two pieces. As described above, first, the concave portion 84 is formed, and the new cut surface 88 is formed so as to finish the cut surface 86 of the concave portion 84. Therefore, the cutting resistance of the tip saw 12 is small and the smooth cut surface 88 is obtained. It is.

In this embodiment, the number of the first cutting tips and the number of the second cutting tips are substantially the same in one saw blade, and these are arranged alternately around the main body. The invention is not limited to this.

For example, different numbers of first cutting tips and second cutting tips can be used. in this case,
For example, one first cutting tip followed by several second cutting tips
It is also possible to arrange several cutting tips, and conversely, it is also possible to arrange several first cutting tips after one second cutting tip.

Further, in this embodiment, the thickness of a portion of the tooth portion to which the first cutting tip is connected at least at the position exceeding the effective height of the second cutting tip is determined by the second cutting tip. Is made thinner than the thickness of the teeth to be joined, but the present invention is not limited to this.

For example, when the effective distance between the pair of side surfaces of the first cutting tip is larger than the thickness of the main body, the thickness of the tooth portion to which the first cutting tip is connected is not necessarily set as follows.
It is not necessary to be less than the thickness of the tooth to which the second cutting tip is joined.

In this embodiment, a circular saw has been described as an example, but the present invention is not limited to a circular saw. For example, the present invention can be applied to a band saw, a hand saw, and the like.

In this embodiment, a saw blade for woodworking has been described as an example, but the present invention is not limited to a saw blade for woodworking. For example, the present invention can be applied to a saw blade for synthetic resin, a saw blade for metalwork, and a saw blade for stone materials.

[Brief description of the drawings]

FIG. 1 is a drawing showing a configuration of a tip saw 12 which is a saw blade according to an embodiment of the present invention.

FIG. 2 is a drawing schematically showing a cross section II-II in FIG.

FIG. 3 is a drawing schematically showing an arrow III in FIG.

FIGS. 4A to 4C are views for explaining how the tip saw 12 cuts the wood 80. FIGS.

FIG. 5 is a view showing a structure of a conventional tip saw 2;

[Explanation of symbols]

 14 Body 14a Central surface 20 Chip 20a Top surface 20b, 20c Side surface 22 Tip 22a ... Top surface 22b, 22c ... Side surface h1 ... Effective height h2 ... Effective height w1 ... Effective distance w2・ ・ ・ ・ ・ ・ Effective distance

Claims (5)

[Claims] 1. A saw blade comprising a substantially flat main body, a tooth protruding from the main body, and a cutting tip connected to the tooth, wherein the first and second cuttings are used as the cutting tip. Each of the first and second cutting tips has a top surface formed by a plane perpendicular to the center plane of the main body and a pair of side faces provided substantially symmetrically with respect to the center plane of the main body. A pair of side surfaces formed by a plane substantially parallel to the center surface of the main body and formed adjacent to the top surface; and a rake surface formed adjacent to the top surface and the pair of side surfaces. Wherein the effective height of the top surface of the first cutting tip is higher than the effective height of the top surface of the second cutting tip, and the effective distance between the pair of side faces of the first cutting tip is the second cutting tip A saw blade that is smaller than the effective distance between the pair of side surfaces. 2. The saw blade according to claim 1, wherein a rake face of each of the first and second cutting tips intersects one or the other of the pair of side faces at a constant acute angle. And the opposite of the inclination direction of the rake face of two adjacent first cutting tips of the first cutting tips, and two adjacent second cutting tips of the second cutting tips The rake face has a reversed inclination direction. 3. The saw blade according to claim 1, wherein the first cutting tip is located at a position exceeding the effective height of at least the second cutting tip among the teeth to which the first cutting tip is joined. The thickness of the portion is smaller than the thickness of the tooth portion to which the second cutting tip is joined. 4. The saw blade according to claim 1, wherein said first and second cutting tips are arranged substantially alternately on adjacent teeth. . 5. The saw blade according to claim 1, wherein the difference between the effective height of the top surface of the first cutting tip and the effective height of the top surface of the second cutting tip is 0. 5 mm or more and 5 mm or less, the effective distance between the pair of side surfaces of the first cutting tip and the second
The difference between the effective distance between the pair of sides of the cutting tip of 0.2
Characterized by being not less than millimeter and not more than 2 millimeters.