JPH09300131A - Saw band blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict a bending as well as noise by a method wherein a cutting area which can be cut during cutting of a hard-to-cut material is made different in a small diameter material and a large diameter material and a cutting resistance is reduced. SOLUTION: A band saw blade 1 is provided with a wave-like saw tooth back surface 5 varying periodically or irregularly at a back surface of a barrel section 3. A plurality of imaginary curved lines L1, L2 formed along an opposite side of the saw tooth back surface 5 in parallel with a waving formed along the saw blade back surface 5. The imaginary curved lines L1 and L2 are provided with a plurality of saw teeth 2S, 4R, 6L, 8R and 10L of which teeth tips are substantially coincided with the imaginary curved lines L1, L2, respectively. In this way, a cutting area which can be cut during cutting of the hard-to-cut material is made to have a less difference between a small diameter material and a large diameter material, resulting in that the cutting resistance can be reduced and the bending as well as noise can be restricted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band saw blade,
More specifically, the present invention relates to a band saw blade capable of suppressing bending and noise when cutting a material to be cut.

[0002]

2. Description of the Related Art Conventionally, as a band saw blade, there is a band saw blade having a constant band width and a constant left and right set amount of each set tooth. In such a general band saw blade, it is often difficult to cut, for example, when cutting a difficult-to-cut material that easily causes work hardening. Therefore, in order to cope with difficult-to-cut materials and to suppress noise during material cutting, various band saw blades have been developed, such as changing the height difference of saw teeth in the band saw blade, changing the amount of clam ejection, and the pitch.

For example, as shown in US Pat. No. 4,195,543, a band saw blade having a constant band width and a wavy shape in the band width direction, and as another example, US Pat. No. 4,557,172 (corresponding to Japanese Patent Publication No. 61-50735). No. 47277, and a band saw blade having a tooth height difference.
No. 88 (corresponding to Japanese Patent Publication No. 7-24973) and U.S. Pat. No. 4,813,324 (corresponding to Japanese Patent Publication No. 7-41467), the tooth height is provided with a height difference, and a tooth having a lower tooth height has a set width. A band saw blade having a large size is known. In addition, US Pat.
(279209), a band saw blade or the like having a wave shape in which the back surface of the saw blade is linear and the tooth tips of the saw blade coincide with a virtual curve has been developed.

[0004]

By the way, in the above-described conventional band saw blade, for example, when cutting a small-diameter material which is a difficult-to-cut material, if the tooth material used for the tooth tips of the band saw blade is the same, The aforementioned US Pat. Nos. 4,195,543 and 4813.
Even with the band saw blades of No. 324 and No. 5094135, there is no big difference in the total cutting area that can be cut. However, when cutting a large-diameter material, it is general that a remarkable difference appears between the band saw blades.

Regarding the large-diameter material that is difficult to cut, comparing the cutting area that can be cut when a conventional band saw blade is used and the cutting area that can cut the small-diameter material,
The current situation is that the cutting area for cutting large diameter materials is extremely small.

Further, in the band saw blade described in the above-mentioned US Pat. No. 4,195,543, although the back surface of the saw blade and the tooth tips are wavy,
Chips are not subdivided. With the band saw blade described in US Pat. No. 4,813,324, the chips are subdivided, but the cutting length is not shortened because they are not corrugated. Further, the US Pat.
With the band saw blade described in No. 094135, the chips can be subdivided, but the effect of shortening the cutting length is small and insufficient because the cutting edge has a corrugated shape that matches the virtual curve only on the tooth tip side. There was a problem that was.

An object of the present invention is to reduce the difference in the cutting area that can be cut between a small-diameter material and a large-diameter material in cutting difficult-to-cut materials, reduce cutting resistance, and suppress bending and noise. To provide a band saw blade.

[0008]

In order to achieve the above object, the invention according to claim 1 is provided with a wavy saw blade back surface which changes periodically or irregularly, and a plurality of virtual curves parallel to the saw blade back surface. Alternatively, it is provided with a plurality of tooth groups whose tooth tips substantially match a plurality of virtual straight lines.

Further, the invention according to claim 2 is the invention according to claim 1, in which a plurality of tooth groups whose tooth tips substantially coincide with a plurality of virtual curves or a plurality of virtual straight lines parallel to the back surface of the saw blade, The tooth group whose tooth tips substantially match a virtual curve or a virtual straight line close to the back surface of the saw blade has a larger set width.

According to a third aspect of the present invention, in the invention according to the first or second aspect, a plurality of tooth groups whose tooth tips substantially match a plurality of virtual curves or a plurality of virtual straight lines parallel to the saw blade back surface, A tooth group whose tooth tips substantially match the virtual curve or straight line farthest from the saw blade back surface is composed of multiple straight teeth, multiple left and right set teeth, or multiple straight teeth and multiple left and right set teeth. A tooth group whose tooth tips substantially match a virtual curve or a virtual straight line is composed of a plurality of left and right set teeth.

With the band saw blade according to the first to third aspects of the present invention, when the material to be cut is cut by the band saw blade, the back surface of the saw blade is a wavy saw blade that changes periodically or irregularly. Since it oscillates along the backup guide, the cutting length is shortened even for large diameter materials. Further, since the tooth group in which the tooth tips substantially match the virtual curve or virtual straight line close to the back surface of the saw blade has a larger set width, the chips are subdivided.

That is, even with a large-diameter material that is difficult to cut, the cutting length is reduced as if it were a small-diameter material, and the chips are subdivided to reduce cutting resistance and noise. It is possible to perform cutting while suppressing the occurrence of bending and making it difficult for bending to occur.

The invention according to claim 4 is the invention according to claim 1 or 2, wherein a plurality of tooth groups whose tooth tips substantially match a plurality of virtual curves or a plurality of virtual straight lines parallel to the back surface of the saw blade, A tooth group whose tooth tip substantially matches the virtual curve or virtual straight line farthest from the back surface of the saw blade is composed of a plurality of straight teeth, or a plurality of bevel-shaped set teeth, or a plurality of straight teeth and a plurality of beet-shaped set teeth, A tooth group whose tooth tips substantially match other virtual curves or virtual straight lines is composed of a plurality of bee-type set teeth.

Since the band saw blade of the invention according to claim 4 is one in which the left and right set teeth employed in the above-mentioned claim 3 are changed to bee-type set teeth, the basic operation and effect thereof are described above. Although it is exactly the same as the one described above, the use of the bevel-type set teeth has a further effect that the cut surface is very small and the cut surface is beautiful.

According to a fifth aspect of the present invention, a saw blade back surface having a shape in which a plurality of waves that change periodically or irregularly are overlapped is provided, and a plurality of virtual curves or virtual straight lines parallel to the saw blade back surface are toothed. It is provided with a plurality of teeth whose tips are substantially coincident with each other.

According to a sixth aspect of the invention, in the invention according to the fifth aspect, the saw blade has a plurality of tooth groups whose tooth tips substantially coincide with a plurality of virtual curves or a plurality of virtual straight lines parallel to the back surface of the saw blade. It is configured such that the tooth group whose tooth tips substantially match a virtual curve or a virtual straight line closer to the back surface has a larger set width.

According to a seventh aspect of the invention, in the invention according to the fifth or sixth aspect, a plurality of tooth groups whose tooth tips substantially match a plurality of virtual curves or a plurality of virtual straight lines parallel to the saw blade back surface, A tooth group whose tooth tips substantially match the virtual curve or straight line farthest from the saw blade back surface is composed of multiple straight teeth, multiple left and right set teeth, or multiple straight teeth and multiple left and right set teeth. A tooth group whose tooth tips substantially match a virtual curve or a virtual straight line is composed of a plurality of left and right set teeth.

By using the band saw blade of the invention according to any one of claims 5 to 7 described above, when a material to be cut is cut by the band saw blade, a plurality of waves that change periodically or irregularly are overlapped. Since the back surface of the saw blade swings along the backup guide of the saw blade, the cutting length is shortened even for large diameter materials. Further, since the tooth group whose tooth tips substantially match the virtual curve or virtual straight line close to the back surface of the saw blade is configured to have a larger set width, the chips are subdivided.

That is, even with a large-diameter material that is difficult to cut, the cutting length is reduced as if it were a small-diameter material, and the chips are subdivided to reduce cutting resistance and noise. It is possible to perform cutting while suppressing the occurrence of bending and making it difficult for bending to occur.

The invention according to claim 8 is the invention according to claim 5 or 6, wherein a plurality of tooth groups whose tooth tips substantially match a plurality of virtual curves or a plurality of virtual straight lines parallel to the saw blade back surface, A tooth group whose tooth tip substantially matches the virtual curve or virtual straight line farthest from the back surface of the saw blade is composed of a plurality of straight teeth, or a plurality of bevel-shaped set teeth, or a plurality of straight teeth and a plurality of beet-shaped set teeth, A tooth group whose tooth tips substantially match other virtual curves or virtual straight lines is composed of a plurality of bee-type set teeth.

Since the band saw blade of the invention according to claim 8 is one in which the left and right set teeth adopted in the above-mentioned claim 7 are changed to bevel type set teeth, the action and effect thereof are completely the same as those described above. Although the same, the use of the beveled set teeth has a further effect that the cut surface has a very small Ouray pattern and the cut surface is clean.

The invention according to claim 9 is provided with a wavy saw blade back surface that changes periodically or irregularly, and is provided on the opposite side of the saw blade back surface without mutual correlation or synchronism with the saw blade back surface. Is provided with a plurality of tooth groups whose tooth tips substantially coincide with a plurality of virtual curves provided in parallel with each other.

According to a tenth aspect of the present invention, in the invention according to the ninth aspect, a plurality of tooth groups whose tooth tips substantially match a plurality of virtual curves provided in parallel on the opposite side of the saw blade back surface are provided. It is a band saw blade whose set width is larger as the tooth group whose tooth tips substantially match the virtual curve close to the blade back surface.

The invention of claim 11 relates to claim 9 or 1.
In the invention described in 0, in a plurality of tooth groups whose tooth tips substantially match a plurality of virtual curves provided in parallel on the opposite side of the saw blade back surface, the tooth tips substantially match a virtual curve furthest from the saw blade back surface. The tooth group to be configured is composed of a plurality of straight teeth, a plurality of right and left set teeth, or a plurality of straight teeth and a plurality of left and right set teeth. It is a band saw blade composed of.

The invention according to claim 12 is claim 9 or 1
In the invention described in 0, in a plurality of tooth groups whose tooth tips substantially match a plurality of virtual curves provided in parallel on the opposite side of the saw blade back surface, the tooth tips substantially match a virtual curve furthest from the saw blade back surface. The group of teeth to be used is multiple straight teeth, or multiple bee-type set teeth,
Or it consists of multiple straight teeth and multiple bee-type set teeth,
A tooth group whose tooth tips substantially match other virtual curves is a band saw blade composed of a plurality of bevel-type set teeth.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, an example of the first embodiment is shown in FIG. 1, in which the band saw blade 1 is provided with a large number of saw teeth on the opposite side of the body 3 from the back surface 5 of the saw blade. It will be. More specifically, the band saw blade 1 is provided with a wavy saw blade back surface 5 that changes periodically or irregularly, and is provided on the opposite side of the saw blade back surface 5 to a first wavy ridge parallel to the wavy undulation formed on the saw blade back surface 5. A plurality of saw teeth 2S, 6L, 8 whose tooth tips substantially match the virtual curve L1
In addition to having a group of R, a group of a plurality of saw teeth 4R and 10L whose tooth tips substantially match the second virtual curve L2 parallel to the first virtual curve L1 is provided.

In other words, the saw teeth 2S, 6L, 8R
When the tooth tips of the saw teeth are connected with a smooth curve, a first virtual curve L1 parallel to the opposite side of the wavy saw blade back surface 5 is obtained, and the tooth tips of the saw teeth 4R and 10L are smoothly curved. By connecting with, a second virtual curve L2 parallel to the first virtual curve L1 is obtained.

The first virtual curve L1 is located outside,
Since the second virtual curve L2 is located inside the saw blade back surface 5, the plurality of saw tooth groups 2S, 6L, 8R whose tooth tips coincide with the first virtual curve L1 are saw tooth groups having high tooth heights. Second
A plurality of sawtooth groups 4R whose tooth tips coincide with the virtual curve L2 of
10L is a saw tooth group having a low tooth height.

Although two virtual curves L1 and L2 are adopted, for example, when a saw tooth having an intermediate tooth height is provided, although not shown, there are three virtual curves. That is, when a plurality of saw tooth groups having different tooth heights are provided, the number of virtual curves is a plurality according to the number of saw tooth groups having various heights.

In the band saw blade 1, the saw tooth 2S is a straight tooth that does not perform right-and-left clam feeding, and the saw blades 4R and 8R are provided.
Is a right set tooth with right set feeding, saw teeth 6L, 1
Numeral 0L is a left set tooth which has been subjected to left set feeding. As is apparent from FIG. 1, the left and right set widths A of the left and right set teeth 6L and 8R whose tooth tips coincide with the first virtual curve L1.
The left and right set teeth widths A2 of the left and right set teeth 4R and 10L whose tooth tips coincide with the second virtual curve L2 are set to be larger than 1.

That is, in the plurality of saw tooth groups having different tooth heights, the set width A2 of the saw tooth group having a low tooth height is set larger than the set width A1 of the saw tooth group having a high tooth height. In other words, the set width is set larger for the tooth group whose tooth tips match the virtual curve L2 closer to the saw blade back surface 5.

Specifically, the wave on the saw blade back surface 5 or the amplitude of the plurality of virtual curves L1 and L2 is 0.1 to 3.0 mm, and the distance between the virtual curves L1 and L2 is 0.05 mm.
It is preferable that it is above. In addition, in FIG. 1, although the regular relationship is not provided between the virtual curves L1 and L2 and the plurality of sawtooth groups, for example, the straight tooth 2 is added to the top of the virtual curve.
It is also possible to provide a regular relationship such that Ss match. Further, as described above, the left and right set teeth 4R, 6L, 8R, and 10L in which the set is fed out to the left and right are used, but the left and right set teeth may be replaced by bee-type set teeth.

With the above structure, when a large-diameter material to be cut is cut by the band saw blade 1, the wavy saw blade back surface 5 which changes periodically or irregularly oscillates along the backup guide of the band saw blade 1. Due to the movement, the cutting length is shortened even for large diameter materials. Furthermore, a virtual curve L2 close to the saw blade back surface 5
Since the tooth group 4R, 10L whose tooth tips substantially coincide with each other has a wider set width A2, the chips are subdivided.

That is, even with a large-diameter material that is difficult to cut, the cutting length is reduced as if it were a small-diameter material, and the chips are subdivided to reduce cutting resistance and noise. Is suppressed, and it is possible to cut with less bending.

Next, an example of test results obtained by cutting with the band saw blade 1 described above is shown below.

Referring to FIG. 2, SUS3 which is a difficult-to-cut material
The test was performed using a solid material No. 04 having a diameter of 100 mm as a material to be cut. The band saw blade used in this test is a band saw blade A, which is a general conventional band saw blade with a constant band width and no wavy shape, no saw tooth tip height difference, and a constant left and right set width. The band saw blade B is a band saw blade having the same structure as the band saw blade shown in US Pat. No. 4,195,543, and the band saw blade C is US Pat.
A band saw blade having the same construction as the band saw blade shown in No. 8133324, a band saw blade D having the same construction as the band saw blade shown in US Pat. No. 5,094,135, and a band saw blade E shown in FIG. 1 of the present invention. The band saw blade has the same configuration as the above configuration. Also, in this test, the band saw machine, saw tooth tooth material, saw tooth tooth material hardness,
The test environment and test conditions such as cutting speed, cutting rate and cutting oil were unified as much as possible.

The result is, as shown in FIG.
It can be said that there is no great difference in any of the five types of band saw blades, as shown by the bar graphs of the cutting cross-sectional areas of the material that can be cut by the five types of band saw blades A, B, C, D, and E. The reason for this is that since the material to be cut is a relatively small diameter material having a diameter of 100 mm, the cutting resistance is relatively small, and the characteristics of the band saw blades B, C, D and E made for the purpose of reducing the cutting resistance are It is thought that it was difficult to appear.

Next, referring to FIG. 3, this test result was tested by using a solid material of SUS304, which is a difficult-to-cut material, having a diameter of 400 mm as a material to be cut. The band saw blade used in this test, the test environment and the test conditions are the same as those in the test shown in FIG. As shown in FIG. 3, the result is a bar graph showing the cross-sectional area of the material to be cut which can be cut by the five kinds of band saw blades A, B, C, D and E. As can be seen from this result, a remarkable difference is seen among the five types of band saw blades A, B, C, D and E. In particular, the band saw blade E of the present invention is four times or more better than the conventional band saw blade A, and the result can be said to be beyond the prediction.

Next, FIG. 4 shows a list of the results of FIGS. 2 and 3 described above, and the five types of band saw blades A, B, C, D, and E have a diameter of 400 mm, which is a relatively large diameter material. And the ratio of the cross-sectional area in which a material having a diameter of 100 mm, which is a relatively small diameter material, can be cut. As can be seen from FIG. 4, the band saw blade E of the present invention is 74.2% of the cross-sectional area capable of cutting a small diameter material.
Which is significantly higher than the conventional band saw blade A of 17.2%, which is considerably higher than the second best band saw blade D of 56.5%. You can see that it has been improved.

Considering the above effects, the construction of the saw blade E is as follows.
Since the saw blade back surface 5 is provided with the corrugated undulation, when the material to be cut is cut, when the saw blade back surface 5 is guided by the backup guides of the left and right saw blade guides in the band saw machine, Oscillation that is determined by the relationship between the saw blade guide width and the corrugated undulation on the back surface of the saw blade occurs, and the cutting length is shortened even if the material to be cut is a large diameter material. Further, since the sawtooth side is also provided with a corrugated undulation, it is considered that when cutting into the material to be cut, a vibration cutting effect is produced. Furthermore, since the set width of the saw teeth having a low tooth height is formed large, the chips are subdivided, and the load generated on each saw tooth is reduced. Due to the synergistic effect that the above effects occur at the same time, a relatively large incision is made even for a workpiece having a large diameter, and a deeper incision than the work hardened layer is made without rubbing the work hardened layer. It is presumed that cutting will be performed.

That is, due to the synergistic effect of the three elements by forming the wavy undulations on both the saw blade back surface 5 and the saw tooth side of the band saw blade 1 and increasing the set width of the saw blade having a low tooth height, the above-mentioned effects are obtained. Good cutting is performed and a peculiar effect is exhibited.

By the way, in order to effectively swing the band saw blade 1 by forming the wavy undulations on the saw blade back surface 5 of the band saw blade 1, the spacing between the backup guides of the left and right saw blade guides is set to W, Letting P be the period of the wavy undulations on the back surface 5 of the saw blade, and the relation W = np / 2 (n is a positive odd number),
More effective.

Next, referring to FIG. 5, a second example will be shown as an example of the embodiment of the present invention.

The band saw blade 1 is provided with a large number of saw teeth on the opposite side of the body 3 from the back surface 5 of the saw blade. More specifically,
The band saw blade 1 has a wavy saw blade back surface 5 that changes periodically or irregularly, and a plurality of saw teeth 2S, 6 whose tooth tips substantially match a first virtual straight line L3 parallel to the opposite side of the saw blade back surface 5.
A group of L and 8R, and a first virtual straight line L3
Is provided with a group of a plurality of saw teeth 4R and 10L whose tooth tips substantially coincide with the second virtual straight line L4 parallel to. In other words, a first virtual straight line L3 is obtained by connecting the tooth tips of the saw teeth 2S, 6L, 8R with a straight line, and
A second virtual straight line L4 parallel to the first virtual straight line L3 is obtained by connecting the tooth tips of the saw teeth 4R and 10L with a straight line.

The first virtual straight line L3 is located outside,
Since the second virtual straight line L4 is located on the inner side, a plurality of saw tooth groups 2S, 6L, whose tooth tips match the first virtual straight line L3,
8R is a saw tooth group having a high tooth height, and a plurality of saw tooth groups 4R and 10L whose tooth tips coincide with the second virtual straight line L4 are saw tooth groups having a low tooth height. In the example of the present embodiment, the number of virtual straight lines L3 and L4 is two. However, for example, when a saw tooth having an intermediate tooth height is provided, the number of virtual straight lines is three. That is, when a plurality of saw tooth groups having different tooth heights are provided, the number of virtual straight lines is a plurality according to the number of saw tooth groups having various heights.

In the band saw blade 1, the saw tooth 2S is a straight tooth that does not perform right-and-left clam feeding, and the saw tooth 4R, 8R.
Is a right set tooth with right set feeding, saw teeth 6L, 1
Numeral 0L is a left set tooth which has been subjected to left set feeding. As is clear from FIG. 5, the left and right set widths A of the left and right set teeth 6L and 8R whose tooth tips coincide with the first virtual straight line L3.
The left and right set teeth widths A2 of the left and right set teeth 4R and 10L whose tooth tips coincide with the second virtual straight line L4 are set to be larger than those of the first set.

That is, in the plurality of saw tooth groups having different tooth heights, the set width A2 of the saw tooth group having the low tooth height is set larger than the set width A1 of the saw tooth group having the high tooth height. In other words, the set width is set larger for the tooth group whose tooth tips match the virtual straight line L4 closer to the saw blade back surface 5. Specifically, the amplitude of the wave on the back surface 5 of the saw blade is 0.1-3.
The distance between the virtual straight line L3 and the virtual straight line L4 is 0 mm.
It is preferably at least 05 mm.

Further, although the left and right set teeth 4R, 6L, 8R, and 10L in which the above-mentioned set-out of the set is performed to the left and right, the left and right set teeth may be replaced by bee-type set teeth.

With the above structure, when a large-diameter material to be cut is cut by the band saw blade 1, the band saw blade 1 is periodically or irregularly formed in the same manner as in the first embodiment described above. The changing back surface 5 of the saw blade swings along the backup guide of the band saw blade 1. Therefore, the cutting length is shortened even with a large-diameter material, and the set width A2 is increased as the tooth groups 4R and 10L whose tooth tips substantially match the virtual straight line L4 near the saw blade back surface 5. As a result, the chips will be subdivided.

That is, even with a large-diameter material which is difficult to cut, the cutting length is artificially shortened like a small-diameter material, and the chips are subdivided to reduce cutting resistance and noise. It is possible to perform cutting while suppressing the occurrence of bending and making it difficult for bending to occur.

Next, referring to FIG. 6, an example of the third embodiment is shown in FIG. 6, in which the band saw blade 1 has a large number of saw teeth on the opposite side of the body 3 from the saw blade rear surface 5. It is equipped with. More specifically, the band saw blade 1 includes a saw blade back surface 5 having a shape in which a plurality of waves 5A and 5B that change periodically or irregularly are overlapped, the wave 5A is a small wave, and the wave 5B is a large wave. The wave 5A is formed along the swell of the wave 5B. A first virtual curve L5 parallel to the wave 5A is provided with a group of a plurality of saw teeth 2S, 6L, 8R whose tooth tips substantially match each other, and a second virtual curve L6 parallel to the first virtual curve L5. A plurality of saw teeth 4R, 1 whose tooth tips substantially coincide with
It has a group of 0L.

In other words, the saw teeth 2S, 6L, 8R
If you connect the tooth tips with a smooth curve, the saw blade back surface 5 of wave 5A
A first virtual curve L5 parallel to the opposite side of the first virtual curve L5 is obtained, and when the tooth tips of the saw teeth 4R and 10L are connected by a smooth curve, a second virtual curve L5 parallel to the first virtual curve L5 is obtained. A curve L6 is obtained.

The first virtual curve L5 is located outside,
Since the second virtual curve L6 is located inside, the plurality of saw tooth groups 2S, 6 whose tooth tips substantially match the first virtual curve L5.
L and 8R are saw tooth groups having a high tooth height, and the second virtual curve L
A plurality of saw tooth groups 4R and 10L whose tooth tips substantially coincide with 6 are saw tooth groups having a low tooth height.

Although two virtual curves L5 and L6 are adopted, for example, when a saw tooth having an intermediate tooth height is provided, although not shown, the virtual curve has three virtual curves. That is, when a plurality of saw tooth groups having different tooth heights are provided, the number of virtual curves is a plurality according to the number of saw tooth groups having various heights.

In the band saw blade 1, the saw tooth 2S is a straight tooth which does not perform right-and-left clam feeding, and the saw tooth 4R, 8R.
Is a right set tooth with right set feeding, saw teeth 6L, 1
Numeral 0L is a left set tooth which has been subjected to left set feeding. As is apparent from FIG. 6, the left and right set widths A1 of the left and right set teeth 6L and 8R whose tooth tips match the first virtual curve L5 are smaller than the left and right set widths A1 of the left and right set teeth 6L and 8R. The left and right set widths A2 of the set teeth 4R and 10L are set larger.

That is, in the plurality of saw tooth groups having different tooth heights, the set width A2 of the saw tooth group having the low tooth height is set larger than the set width A1 of the saw tooth group having the high tooth height. In other words, the set width is set larger for the tooth group whose tooth tips match the virtual curve L6 closer to the saw blade back surface 5.

Specifically, the amplitude of the waves 5A, 5B on the saw blade back surface 5 or the plurality of virtual curves L5, L6 is 0.1 to 3.0.
In mm, the distance between the virtual curve L5 and the virtual curve L6 is preferably 0.05 mm or more. In addition, in FIG. 6, although no regular relation is established between the virtual curves L5 and L6 and the plurality of sawtooth groups, for example, the virtual curve L5
It is also possible to provide a regular relationship such that the straight teeth 2S substantially coincide with each other at the top of the. Further, as described above, the right and left set teeth 4R, 6L, which are set to the left and right, are set to the left and right.
Although 8R and 10L are used, bevel-type set teeth may be used instead of the left and right set teeth.

With the above structure, when a large-diameter material to be cut is cut by the band saw blade 1, the saw blade back surface 5 having a shape in which a plurality of waves 5A and 5B that change periodically or irregularly overlap each other is formed. Since the blade 1 swings along the backup guide, the cutting length is shortened even with a large diameter material. Furthermore,
Since the set width A2 is increased as the tooth groups 4R and 10L whose tooth tips substantially match the virtual curve L6 close to the saw blade back surface 5, the chips are subdivided. .

That is, even with a large-diameter material that is difficult to cut, the cutting length is reduced as if it were a small-diameter material, and the chips are subdivided to reduce the cutting resistance and reduce the band saw. It is possible to more effectively suppress an increase in noise due to the resonance of the blade 1, and it is possible to perform cutting with less bending.

Next, referring to FIG. 7, there is shown an example of a fourth embodiment as an example of the embodiment of the present invention, in which the band saw blade 1 is opposite to the saw blade back surface 5 of the body 3. It has a large number of saw teeth on its side. More specifically, the band saw blade 1 includes a saw blade back surface 5 having a shape in which a plurality of waves 5A and 5B that change periodically or irregularly are overlapped, the wave 5A is a small wave, and the wave 5B is a large wave. , Wave 5 on the swell of wave 5B
A is formed along. The first parallel to this wave 5B
A plurality of saw teeth 2 whose tooth tips substantially match the virtual curve L1 of
It is provided with a group of S, 6L, 8R, and a group of a plurality of saw teeth 4R, 10L whose tooth tips substantially match the second virtual curve L2 parallel to the first virtual curve L1.

In other words, the saw teeth 2S, 6L, 8R
If you connect the tooth tips with a smooth curve, the back surface of the saw blade 5
A first virtual curve L1 parallel to the opposite side of the first virtual curve L1 is obtained, and when the tooth tips of the saw teeth 4R and 10L are connected by a smooth curve, a second virtual curve L1 parallel to the first virtual curve L1 is obtained. A curve L2 is obtained.

The first virtual curve L1 is located outside,
Since the second virtual curve L2 is located inside, the plurality of saw tooth groups 2S, 6 whose tooth tips substantially match the first virtual curve L1.
L and 8R are saw tooth groups having a high tooth height, and a plurality of saw tooth groups 4R and 10L whose tooth tips substantially match the second virtual curve L2 are saw tooth groups having a low tooth height.

Although two virtual curves L1 and L2 are adopted, for example, when a saw tooth having an intermediate tooth height is provided, although not shown, the virtual curve has three virtual curves. That is, when a plurality of saw tooth groups having different tooth heights are provided, the number of virtual curves is a plurality according to the number of saw tooth groups having various heights.

In the band saw blade 1, the saw tooth 2S is a straight tooth that does not perform right-and-left clam-feeding, and the saw tooth 4R, 8R.
Is a right set tooth with right set feeding, saw teeth 6L, 1
Numeral 0L is a left set tooth which has been subjected to left set feeding. As is clear from FIG. 7, the tooth tips of the second virtual curve L2 are more substantially matched than the left and right set widths A1 of the left and right set teeth 6L and 8R whose tooth tips are substantially matched with the first virtual curve L1. Left and right set width A2 of the set teeth 4R and 10L
Is larger.

That is, in the plurality of saw tooth groups having different tooth heights, the set width A2 of the saw tooth group having the low tooth height is set larger than the set width A1 of the saw tooth group having the high tooth height. In other words, the set width is set larger for a tooth group whose tooth tips substantially match the virtual curve L2 closer to the saw blade back surface 5.

Specifically, the waves 5A and 5B on the saw blade back surface 5 or the plurality of virtual curves L1 and L2 have an amplitude of 0.1 to 3.0.
In mm, the distance between the virtual curve L1 and the virtual curve L2 is preferably 0.05 mm or more. It should be noted that, in FIG. 7, although there is no regular relationship between the virtual curves L1 and L2 and the plurality of sawtooth groups, for example, the virtual curve L1
It is also possible to provide a regular relationship such that the straight teeth 2S substantially coincide with each other at the top of the. Further, as described above, the left and right set teeth 4R, 6L, 8 which have been set to the left and right are set out.
Although R and 10L are used, bevel-type set teeth may be used instead of the left and right set teeth.

With the above structure, when a large-diameter material to be cut is cut by the band saw blade 1, the saw blade back surface 5 having a shape in which a plurality of waves 5A and 5B that change periodically or irregularly overlap each other is formed. Since the blade 1 swings along the backup guide, the cutting length is shortened even with a large diameter material. Furthermore,
Since the set width A2 becomes larger as the tooth groups 4R and 10L whose tooth tips substantially match the virtual curve L2 near the saw blade back surface 5, the chips are subdivided. .

That is, even with a large-diameter material that is difficult to cut, the cutting length is reduced as if it were a small-diameter material, and the chips are subdivided to reduce the cutting resistance and reduce the band saw. It is possible to more effectively suppress an increase in noise due to the resonance of the blade 1, and it is possible to perform cutting with less bending.

Next, referring to FIG. 8, there is shown an example of the fifth embodiment as an example of the embodiment of the present invention, in which the band saw blade 1 is opposite to the saw blade back surface 5 of the body portion 3. It has a large number of saw teeth on its side. More specifically, the band saw blade 1 includes a saw blade back surface 5 having a shape in which a plurality of waves 5A and 5B that change periodically or irregularly are overlapped, the wave 5A is a small wave, and the wave 5B is a large wave. , Wave 5 on the swell of wave 5B
A is formed along.

A plurality of saw teeth 2S whose tooth tips substantially coincide with the first virtual straight line L3 which is parallel to the opposite side of the saw blade back surface 5.
It is provided with a group of 6L and 8R and has a first virtual straight line L.
A group of a plurality of saw teeth 4R and 10L whose tooth tips substantially match a second virtual straight line L4 parallel to 3 is provided. In other words, a first virtual straight line L3 is obtained by connecting the tooth tips of the saw teeth 2S, 6L, 8R with a straight line, and
A second virtual straight line L4 parallel to the first virtual straight line L3 is obtained by connecting the tooth tips of the saw teeth 4R and 10L with a straight line.

The first virtual straight line L3 is located outside,
Since the second virtual straight line L4 is located inside, a plurality of saw tooth groups 2S, 6 whose tooth tips substantially match the first virtual straight line L3.
L and 8R are saw tooth groups with high tooth height, and the second virtual straight line L
The plurality of saw tooth groups 4R and 10L whose tooth tips substantially coincide with 4 are saw tooth groups having a low tooth height. In the example of the present embodiment, the number of virtual straight lines L3 and L4 is two. However, for example, when a saw tooth having an intermediate tooth height is provided, the number of virtual straight lines is three. That is, when a plurality of saw tooth groups having different tooth heights are provided, the number of virtual straight lines is a plurality according to various heights and the number of saw tooth groups.

In the band saw blade 1, the saw tooth 2S is a straight tooth which does not perform right-and-left clam feeding, and the saw tooth 4R, 8R.
Is a right set tooth with right set feeding, saw teeth 6L, 1
Numeral 0L is a left set tooth which has been subjected to left set feeding. As is clear from FIG. 8, the tooth tips substantially match the second virtual straight line L4 rather than the left and right set widths A1 of the left and right set teeth 6L and 8R whose tooth tips substantially match the first virtual straight line L3. Left and right set width A2 of the set teeth 4R and 10L
Is larger.

That is, in the plurality of saw tooth groups having different tooth heights, the set width A2 of the saw tooth group having the low tooth height is set larger than the set width A1 of the saw tooth group having the high tooth height. In other words, the set width is set larger for the tooth group whose tooth tips substantially match the virtual straight line L4 near the saw blade back surface 5. Specifically, the waves 5A and 5B on the back surface 5 of the saw blade
Is preferably 0.1 mm to 3.0 mm, and the distance between the virtual straight line L3 and the virtual straight line L4 is 0.05 mm or more.

Further, although the left and right set teeth 4R, 6L, 8R, and 10L in which the above-mentioned set is fed out to the left and right, the left and right set teeth may be replaced by bee-type set teeth.

With the above structure, when a large-diameter material to be cut is cut by the band saw blade 1, the saw blade back surface 5 having a shape in which a plurality of waves 5A and 5B that change periodically or irregularly overlap each other is formed. Since the blade 1 swings along the backup guide, the cutting length is shortened even with a large diameter material. Further, the tooth group 4R, 10L whose tooth tips substantially match the virtual straight line L4 near the saw blade back surface 5 is configured to have a larger set width A2, so that the chips are subdivided. is there.

That is, even with a large-diameter material that is difficult to cut, the cutting length is reduced as if it were a small-diameter material, and the chips are subdivided to reduce the cutting resistance and reduce the band saw. It is possible to more effectively suppress an increase in noise due to the resonance of the blade 1, and it is possible to perform cutting with less bending.

The present invention is not limited to the above-described embodiments of the invention, but can be implemented in other modes by making appropriate changes. That is, for example, the phase of the wave shape of the saw blade back surface 5 and the wave shape of the saw tooth side may be appropriately shifted, and the cycle and amplitude of both wave shapes may be different.

That is, as shown in FIG. 9, in the band saw blade 1, there is a correlation or synchronism with the saw blade back surface 5 on the side opposite to the wavy saw blade back surface 5 which changes periodically or irregularly. Without a plurality of virtual curves L provided in parallel with each other
1, L2 has a plurality of tooth groups 2S, 4 whose tooth tips substantially match
A configuration in which R, 6L, 8R, and 10L are provided may be used.

The structure of the band saw blade 1 shown in FIG. 9 is such that the back surface 5 of the wavy saw blade and the plurality of virtual curves L1 and L2 do not have correlation or synchronism, and other structures are the same as those described above. Since the configuration is the same as that of 1, the detailed description will be omitted. In addition, also in the above, the same effect as the above-mentioned band saw blade can be exhibited.

FIG. 10 shows a modified example of the band saw blade 1 shown in FIG. 5, in which the saw blade back surface 5 of the band saw blade 1 has a structure in which trapezoidal irregularities are repeated and the left and right set teeth shown in FIG. The heights of 4R, 6L, 8R, and 10L are reversed, and other configurations are similar to those of the band saw blade described above.

That is, FIG. 10 illustrates that the corrugated shape of the saw blade back surface 5 of the band saw blade 1 can be various shapes. As will be understood, the saw blade back surface 5 may have a wavy shape, that is, a structure in which concave portions and convex portions are alternately repeated. For example, a convex portion or concave portion such as a crescent in a linear portion is appropriately spaced. It is also possible to adopt a configuration in which it is provided, and such a configuration can also achieve substantially the same effects as described above.

FIG. 11 shows another modification of the band saw blade 1 shown in FIG. In the configuration of FIG. 11, the right and left set teeth 2L and 6R having large tooth heights are arranged before and after the straight tooth 4S having large tooth heights, and the tooth heights of the other left and right set teeth 8L and 12R are reduced. However, the straight tooth 10S having a small tooth height is arranged between them.

That is, in the configuration of FIG. 11, right and left set teeth 2L, 6R, 8L having the same tooth height are arranged before and after the straight tooth 4S having a large tooth height and the straight tooth 10S having a small tooth height, respectively.
12R is arranged, and the left and right set teeth are provided with substantially the same set width in the left-right direction.

In the structure shown in FIG. 11, the saw tooth groups 2L, 4S, 6R having large tooth heights and the saw tooth groups 8L, 10S, 12R having small tooth heights are alternately and repeatedly arranged. On the sawtooth side, the unevenness is repeated as a whole, and the sawtooth groups 2L and 4 having a large tooth height dimension.
S and 6R act relatively strongly on the cutting of the work, and when cutting a difficult-to-cut material, the work hardened layer is scraped off to improve the cutting performance.

In this case, the concavo-convex pattern on the saw-teeth side as a whole and the corrugated back surface are combined to produce the effect of scraping off the bottom of the work-hardened layer and the effect of shortening the cutting length. Even a large-diameter material can be cut almost in the same manner as when a small-diameter material is cut, and the same effect as the band saw blade described above can be obtained.

Needless to say, in this example, the saw blade side may be formed in an appropriate wave shape. In this case, not only the above-mentioned effect but also the vibration cutting effect can be obtained.

FIG. 12 shows that the straight teeth 2S having a large tooth height and the beveled set teeth 4B having a small tooth height are alternately arranged, and along the virtual curves L1 and L2, the back surface 5 side of the band saw blade 1 and Fig. 3 shows a band saw blade having a wavy shape on the saw tooth side. Also in this configuration, the same effect as that of the band saw blade described above can be obtained.

In addition, in the above-mentioned structure, the use of the beveled set teeth has a further effect that the Urey pattern on the cut surface becomes very small and the cut surface is beautiful.

In FIG. 13, only the straight tooth 2S is a large saw tooth having a large tooth height, the left and right set teeth 4R and 6L are small saw teeth having a small tooth height, and the band saw blade 1 has a configuration along the virtual curves L1 and L2. 2 shows a band saw blade in which both the back surface 5 and the saw tooth side are formed in a wavy shape. Also in this configuration, the same effect as that of the band saw blade described above can be obtained.

As can be understood from the above explanation,
The band saw blade of the present invention is provided with a wavy saw blade back surface and has substantially the same basic effect as long as the saw tooth height is different. Specifically, the wavy saw blade back surface may be a wavy saw blade back surface that changes periodically or irregularly, or may be a saw blade back surface in which a plurality of waves that periodically or randomly change overlap. Alternatively, it may be a saw blade back surface having a shape in which concave portions and convex portions are alternately repeated, or may be a saw blade back surface having a combination thereof. Further, specifically, the aspect in which the tooth heights of the saw teeth are different may be one including a plurality of tooth groups whose tooth tips substantially match a plurality of virtual curves or a plurality of virtual straight lines parallel to the saw blade back surface. It may be provided with a plurality of tooth groups on the opposite side of the blade back surface, which have no correlation or synchronism with the saw blade back surface, and whose tooth tips substantially coincide with a plurality of virtual curves provided in parallel with each other. As for the saw tooth, it is possible to carry out various combinations of a straight tooth, a set tooth, a beveled set tooth, etc., and it is also possible to carry out other suitable changes and combinations.

[0092]

As can be understood from the examples of the embodiment described above, according to the present invention according to claims 1 to 4,
When the material to be cut is cut by the band saw blade, the back surface of the saw blade, which has a wavy shape that changes periodically or irregularly, oscillates along the backup guide, so that the cutting length is shortened even with a large diameter material. Further, since the tooth group whose tooth tips substantially match the virtual curve or virtual straight line near the back surface of the saw blade is configured to have a larger set width, the chips are subdivided.

Further, regarding the mode in which the undulations are formed on both the back surface of the saw blade and the saw tooth side, it is considered that when cutting into the material to be cut, a vibrating cutting effect is produced, and due to the synergistic effect of the three elements, The effect is obtained.

That is, even with a large-diameter material that is difficult to cut, the cutting length is artificially shortened like a small-diameter material, and the chips are subdivided to reduce cutting resistance and noise. Is suppressed, and it is possible to cut with less bending. In other words, regardless of whether it is a large-diameter material or a small-diameter material, the life of the band saw blade is about the same, which makes it easier to predict the life of the band saw blade from the cutting area, and manages and cuts compared to conventional band saw blades. The plan is easy to implement. Further, regarding the cutting of a large-diameter material, the life of the band saw blade is remarkably improved as compared with the conventional band saw blade, so that a more economical effect can be obtained as compared with the conventional case.

Further, in the structure in which the left and right set teeth are beveled set teeth, there is an additional effect that the cut surface has a very small Ouray pattern and the cut surface is clean.

Further, according to the present invention according to claims 5 to 8, when the material to be cut is cut by the band saw blade, the back surface of the saw blade having a shape in which a plurality of waves that periodically or irregularly change are overlapped is backed up. Since it swings along the guide, the cutting length is shortened even for large diameter materials. Further, since the tooth group whose tooth tips substantially match the virtual curve or virtual straight line near the back surface of the saw blade is configured to have a larger set width, the chips are subdivided.

That is, even with a large-diameter material that is difficult to cut, the cutting length is reduced as if it were a small-diameter material, and the chips are subdivided to reduce the cutting resistance. Since the back surface of the saw blade has a shape in which the waves are overlapped, it is possible to more effectively suppress an increase in noise due to resonance of the band saw blade. Still further, it is possible to cut with less bending.

In other words, the life of the saw blade is about the same regardless of whether it is a large diameter material or a small diameter material. Therefore, the saw blade life can be easily predicted from the cutting area, and the saw blade life can be estimated more easily than the conventional band saw blade. The cutting management and cutting plan can be easily implemented.
Further, regarding the cutting of a large-diameter material, the life of the band saw blade is remarkably improved as compared with the conventional band saw blade, so that a more economical effect can be obtained as compared with the conventional case.

The invention according to claims 9 to 12 is provided with a wavy saw blade back surface that changes periodically or irregularly, and has no correlation or synchronism with the saw blade back surface on the side opposite to the saw blade back surface. Since it is provided with a plurality of tooth groups whose tooth tips substantially coincide with a plurality of virtual curves provided in parallel with each other, there is no synchronization between the wave on the back surface of the saw blade and the wave on the tip side, It is possible to more effectively suppress an increase in noise due to the resonance of the band saw blade. Still further, it is possible to cut with less bending.

In other words, the life of the saw blade is the same regardless of whether it is a large diameter material or a small diameter material. Therefore, the saw blade life can be easily predicted from the cutting area, and the saw blade life can be estimated more easily than the conventional band saw blade. The cutting management and cutting plan can be easily implemented.
Further, regarding the cutting of a large-diameter material, the life of the band saw blade is remarkably improved as compared with the conventional band saw blade, so that a more economical effect can be obtained as compared with the conventional case.

[Brief description of drawings]

FIG. 1 shows a band saw blade which is the main part of the present invention,
Is a front view, and (b) is a bottom view.

FIG. 2 is a bar graph showing experimental results and showing a cutting cross-sectional area when a small-diameter material is cut using various band saw blades.

FIG. 3 is a bar graph showing experimental results and showing a cutting cross-sectional area when a large-diameter material is cut using various band saw blades.

FIG. 4 is a table showing experimental results and showing a ratio of a cutting cross-sectional area when cutting a small diameter material and a large diameter material using various band saw blades.

FIG. 5 shows a band saw blade that is an example of a second embodiment of the present invention, (a) is a front view and (b) is a bottom view.

FIG. 6 shows a band saw blade which is an example of a third embodiment of the invention, (a) is a front view and (b) is a bottom view.

FIG. 7 shows a band saw blade as an example of a fourth embodiment of the present invention, (a) is a front view and (b) is a bottom view.

FIG. 8 shows a band saw blade which is an example of a fifth embodiment of the present invention, (a) is a front view and (b) is a bottom view.

FIG. 9 shows a band saw blade as an example of a sixth embodiment of the present invention, (a) is a front view and (b) is a bottom view.

FIG. 10 shows a band saw blade which is an example of a seventh embodiment of the present invention, (a) is a front view and (b) is a bottom view.

FIG. 11 shows a band saw blade which is an example of an eighth embodiment of the invention, (a) is a front view and (b) is a bottom view.

FIG. 12 shows a band saw blade which is an example of a ninth embodiment of the invention, (a) is a front view and (b) is a bottom view.

13A and 13B show a band saw blade that is an example of a tenth embodiment of the invention, FIG. 13A being a front view and FIG. 13B being a bottom view.

[Explanation of symbols]

1 band saw blade 3 body part 5 saw blade back surface 5A, 5B wave L1 first virtual curve L2 second virtual curve L3 first virtual straight line L4 second virtual straight line L5 first virtual curve L6 second virtual curve 2S, 4R, 6L, 8R, 10L, 2L, 4S, 6R,
8L, 10S, 12R, 4B Sawtooth A1, A2 Set width

Claims (12)

[Claims] 1. A saw blade back surface that changes periodically or irregularly, and a plurality of tooth groups whose tooth tips substantially match a plurality of virtual curves or virtual straight lines parallel to the saw blade back surface. Band saw blade that is characterized by. 2. The invention according to claim 1, wherein a plurality of tooth groups whose tooth tips substantially match a plurality of virtual curves or a plurality of virtual straight lines parallel to the saw blade back surface, and a virtual curve close to the saw blade back surface or A band saw blade characterized in that a set of teeth whose tooth tips substantially match a virtual straight line has a larger set width. 3. The method according to claim 1, wherein
There are multiple tooth groups whose tooth tips substantially match the virtual curves or virtual straight lines parallel to the saw blade back surface, and tooth groups whose tooth tips almost match the farthest virtual curve or virtual straight line from the saw blade back surface. Tooth, or multiple left and right set teeth, or multiple straight teeth and multiple left and right set teeth, and a tooth group whose tooth tips substantially match other virtual curves or virtual straight lines is configured with multiple left and right set teeth. Band saw blade that is characterized by being. 4. The invention according to claim 1 or 2,
There are multiple tooth groups whose tooth tips substantially match the virtual curves or virtual straight lines parallel to the saw blade back surface, and tooth groups whose tooth tips almost match the farthest virtual curve or virtual straight line from the saw blade back surface. Tooth, or multiple bee-type set teeth, or a group of teeth that are composed of multiple straight teeth and multiple set-type set teeth, and that have tooth tips that substantially match other virtual curves or virtual straight lines Band saw blade characterized by being composed of teeth. 5. A plurality of saw blade back surfaces each of which has a shape in which a plurality of waves that change periodically or irregularly are overlapped, and a plurality of tooth tips that substantially coincide with a plurality of virtual curves or virtual straight lines parallel to the saw blade back surface. A band saw blade, which is characterized by comprising a tooth group of. 6. The invention according to claim 5, wherein a plurality of virtual curves parallel to the back surface of the saw blade or a plurality of tooth groups whose tooth tips substantially match a plurality of virtual straight lines and a virtual curve close to the back surface of the saw blade or A band saw blade characterized in that a set of teeth whose tooth tips substantially match a virtual straight line has a larger set width. 7. The invention according to claim 5 or 6,
There are multiple tooth groups whose tooth tips substantially match the virtual curves or virtual straight lines parallel to the saw blade back surface, and tooth groups whose tooth tips almost match the farthest virtual curve or virtual straight line from the saw blade back surface. Tooth, or multiple left and right set teeth, or multiple straight teeth and multiple left and right set teeth, and a tooth group whose tooth tips substantially match other virtual curves or virtual straight lines is configured with multiple left and right set teeth. Band saw blade that is characterized by being. 8. In the invention according to claim 5 or 6,
There are multiple tooth groups whose tooth tips substantially match the virtual curves or virtual straight lines parallel to the saw blade back surface, and tooth groups whose tooth tips almost match the farthest virtual curve or virtual straight line from the saw blade back surface. Tooth, or multiple bee-type set teeth, or a group of teeth that are composed of multiple straight teeth and multiple set-type set teeth, and that have tooth tips that substantially match other virtual curves or virtual straight lines Band saw blade characterized by being composed of teeth. 9. A wavy saw blade back surface that changes periodically or irregularly, and is provided on the opposite side of the saw blade back surface in parallel with each other without correlation or synchronism with the saw blade back surface. A band saw blade comprising a plurality of tooth groups whose tooth tips substantially match a plurality of virtual curves. 10. The invention according to claim 9, wherein a plurality of tooth groups whose tooth tips substantially match the plurality of virtual curves provided in parallel on the opposite side of the saw blade back surface, and the virtual curve close to the saw blade back surface. A band saw blade characterized in that a set of teeth whose tooth tips substantially coincide with each other has a larger set width. 11. The invention according to claim 9 or 10, wherein a plurality of tooth groups whose tooth tips substantially coincide with a plurality of virtual curves provided in parallel on the opposite side of the saw blade back surface, the tooth group being closest to the saw blade back surface. A tooth group whose tooth tip almost matches a distant virtual curve is composed of multiple straight teeth, or multiple right and left set teeth, or multiple straight teeth and multiple left and right set teeth, and the tooth tips substantially match other virtual curves A band saw blade characterized in that a group of teeth to be formed is composed of a plurality of right and left set teeth. 12. The invention according to claim 9 or 10, wherein a plurality of tooth groups whose tooth tips substantially match a plurality of virtual curves provided in parallel on the opposite side of the back surface of the saw blade, the tooth group being most adjacent to the back surface of the saw blade. A tooth group whose tooth tips substantially match a distant virtual curve is composed of multiple straight teeth, or multiple beveled set teeth, or multiple straight teeth and multiple beetle set teeth, and the tooth tips of other virtual curves are A band saw blade characterized in that a group of teeth that substantially match each other is composed of a plurality of bee-type set teeth.