JP2023049293A - band saw blade - Google Patents

Abstract

To provide a band saw blade which hardly causes tooth-chipping.SOLUTION: A band saw blade (90) includes a plurality of tooth assembly (90s) repeatedly formed, the tooth assembly (90s) has a first straight tooth (S01), a first set teeth assembly (Ts01) projected to one side of right and left, a second straight tooth (S02) and a second set teeth assembly (Ts02) projected to the other side of right and left in the order. The first set teeth assembly (Ts01) and the second set teeth assembly (Ts02) contain at least two pieces of set teeth (L01, L02)(R01, R02) and have n (integer of two or more) pieces of set teeth continuously formed.SELECTED DRAWING: Figure 1

Description

The present invention relates to band saw blades.

Patent Literature 1 describes a technique related to a tooth row for improving various performances when cutting a material to be cut with a band saw blade having straight teeth and set teeth.
The performance to be improved is, for example, resistance to bending and cutting ability independent of the shape of the material to be cut.

Patent Document 1 discloses, for example, a set in which set teeth following a straight tooth are alternately arranged one by one on the left and right in the cutting order of the tooth row (so-called raker set), and a tooth row that is different in the same direction. A set of teeth that are swung out by a swung amount are arranged so as to swing out alternately in the left and right direction (here, referred to as a twin set).

Japanese Patent No. 4133325

By the way, when the band saw machine is small, the saw blade housing containing the band saw blade is rotated around one rotation axis to cut the material to be cut.
Then, the saw blade housing is adjusted to have a desired weight, the band saw blade is applied to the material to be cut from above, and the material to be cut is cut by the weight of the saw blade housing.
A band saw with this structure is hereinafter referred to as a light duty saw.

The tooth tip pitch of the band saw blade used in this light-load saw machine has a narrower setting range than the tooth tip pitch of the band saw blade used in the stationary band saw machine.
For example, band saw blades generally used for stationary band saw machines have a wide range of tip pitches from pitch 6 (number of teeth/inch: about 4.2 mm) to pitch 18 (number of teeth/inch: about 1.4 mm). , it is set at an equal pitch or an unequal pitch combining different pitches.
On the other hand, most band saw blades used for light-load saw machines have either pitch 14 (number of teeth/inch: about 1.8 mm) or pitch 18 (number of teeth/inch: about 1.4 mm). Either one of the pitches is set at a uniform pitch, or a combination of the two is set at a non-uniform pitch.
Therefore, the teeth of band saw blades used in light-load saw machines have a relatively small shape and a small bending strength.

A light-duty saw is easy to handle and is therefore suitable for on-site work, such as cutting steel structures at construction sites, for cutting relatively small materials. Therefore, the materials to be cut include various solid materials, hollow materials, and deformed materials used on site. In short, the band saw blade of the light-load saw machine can process various structural materials such as a solid material with solid content, square pipe with no content, and C-shaped, H-shaped, and L-shaped.
Therefore, when cutting with a light-load saw, the distance of the cutting path varies greatly, and the position and number of cut parts often change every second as the cutting progresses. The load fluctuation is also large. Therefore, the load applied to each tooth, mainly set teeth with a large amount of swing, is extremely large.

For cutting with such a light load sawing machine, if a raker set or twin set band saw blade as described in Patent Document 1 is applied to cut, for example, a C-shaped structural material, only the web on both sides is cut. In this case, the load applied to the teeth is only the thickness of the web. Therefore, if the pitch between teeth is large, the load applied to one tooth immediately increases. On the other hand, when the web and flange are cut together, the load on one tooth at the flange portion is small, and the load fluctuation is large, which causes tooth chipping.

As described above, band saw blades used for light-duty saw machines have relatively low tooth bending strength, but have the problem of being susceptible to tooth chipping due to the large load applied to the teeth. Desired.

In order to solve the above problems, one aspect of the present invention has the following configuration 1).
1) A plurality of sets of teeth are repeatedly formed, and the set of teeth includes a first straight tooth, a first set tooth set swung to one side, a second straight tooth, and a set of teeth swung to the other side. The first set tooth set and the second set tooth set are continuously formed including at least two set teeth set with the same maximum set amount. It is a band saw blade having n (an integer equal to or greater than 2) set teeth.
As a result, the load applied to the set teeth included in each set tooth set is greatly reduced to 1/n based on the number of set teeth n of each set.
As a result, the band saw blade is less susceptible to tooth chipping.

According to one aspect of the present invention, it is possible to obtain a band saw blade that is less susceptible to tooth chipping.

1A and 1B are diagrams of a band saw blade 90 of Example 1 of a band saw blade according to an embodiment of the present invention, FIG. 1(a) being a partial side view and FIG. 1(b) being a partial bottom view. 2A and 2B are diagrams of a band saw blade 91 of Example 2 of the band saw blade according to the embodiment of the present invention, FIG. 2(a) being a partial side view and FIG. 2(b) being a partial bottom view. 3A and 3B are views of a band saw blade 92 of Example 3 of the band saw blade according to the embodiment of the present invention, FIG. 3(a) being a partial side view and FIG. 3(b) being a partial bottom view. 4A and 4B are views of a band saw blade 93 of Example 4 of the band saw blade according to the embodiment of the present invention, FIG. 4A being a partial side view and FIG. 4B being a partial bottom view. FIG. 5 is a diagram showing the same-type set tooth-to-tooth range AR, and FIGS. 5(a) to 5(d) are schematic diagrams showing the tooth rows of the band saw blades 90 to 93, respectively. FIG. 6 is a diagram showing the application relationship between the pitch PM and Examples 1-4. 7A and 7B are views of a band saw blade 91A which is a modified example of the band saw blade 91. FIG. 7A is a partial side view, and FIG. 7B is a partial bottom view. 8A and 8B are diagrams of a band saw blade 93A which is a modified example of the band saw blade 93, FIG. 8A being a partial side view and FIG. 8B being a partial bottom view.

(Example 1)
1A and 1B are diagrams of a band saw blade 90 of Example 1 of a band saw blade according to an embodiment of the present invention, FIG. 1(a) being a partial side view and FIG. 1(b) being a partial bottom view.
The band saw blade 90 has a trunk portion 90a formed into an endless loop by joining band-shaped ends. A tooth portion 90b is formed on one (lower) edge portion of the body portion 90a.

In the tooth portion 90b, a tooth set 90s, which is a set of a plurality of teeth in which pitches P01 to P06 between tooth tips are formed as a pitch pattern P0, is continuously and repeatedly formed.
Six teeth are included in the tooth set 90s, and when viewed from the leading end of the band saw blade 90 in the traveling direction, the straight tooth S01, the left set tooth L01, the left set tooth L02, the straight tooth S02, the right set tooth R01, and the right set tooth R01. It is set as set tooth R02. The tips of the teeth included in the tooth set 90s are all at the same height position in the vertical direction.
The left set tooth L01 and the left set tooth L02 are set teeth formed by bending the teeth of the tooth portion 90b to the left with respect to the body portion 90a at a position close to the body portion 90a. The swing-out amount of the left set tooth L01 and the left set tooth L02 is equal to the swing-out amount dL.
The right set tooth R01 and the right set tooth R02 are set teeth formed by bending the teeth of the tooth portion 90b to the right with respect to the body portion 90a at a position close to the body portion 90a. The swing-out amount of the right set tooth R01 and the right set tooth R02 is equal to the swing-out amount dR.
The swing amount dL and the swing amount dR are equal.

In the tooth portion 90b of the band saw blade 90, two set tooth sets Ts01 and Ts02, each of which is formed by two sets of set teeth swung in the same direction by the same amount for each of the tooth sets 90s formed repeatedly, form one straight tooth S02. It has a configuration in which it is arranged so as to swing out alternately to the left and right while being sandwiched between them. The set tooth set Ts01 has left set teeth L01 and L02, and the set tooth set Ts02 has right set teeth R01 and R02. It should be noted that the straight teeth S01 and S02 may not be replaced with a straight tooth set each including a plurality of straight teeth as long as the relationship between the tip pitch and the number of continuous set teeth, which will be described later, is maintained. It is possible.

(Example 2)
2A and 2B are diagrams of a band saw blade 91 of Example 2 of the band saw blade according to the embodiment of the present invention, FIG. 2(a) being a partial side view and FIG. 2(b) being a partial bottom view.
The band saw blade 91 has a trunk portion 91a formed into an endless loop shape by joining band-shaped ends. A tooth portion 91b is formed on one edge portion of the body portion 91a.

In the tooth portion 91b, a tooth set 91s, which is a set of a plurality of teeth formed in a pitch pattern P1 with pitches P11 to P18 between tooth tips, is continuously and repeatedly formed.
There are eight teeth included in the tooth set 91s. Seen from the leading end of the band saw blade 91 in the running direction, the straight tooth S11, the left set tooth L11, the left set tooth L12, the left set tooth L13, the right set tooth S12, and the right tooth. A set tooth R11, a right set tooth R12, and a right set tooth R13. The tips of the teeth included in the tooth set 91s are all at the same height position in the vertical direction.

The left set teeth L11 to L13 are set teeth formed by bending the teeth of the tooth portion 91b to the left with respect to the body portion 91a at a position close to the body portion 91a. The swing-out amounts of the left set tooth L11 to the left set tooth L13 are equal to the swing-out amount dL.
The right set teeth R11 to R13 are set teeth formed by bending the teeth of the tooth portion 91b to the right with respect to the body portion 91a at a position close to the body portion 91a. The swing-out amount of the right set tooth R11 to the right set tooth R13 is equal to the swing-out amount dR.
The swing amount dL and the swing amount dR are equal.

The tooth portion 91b of the band saw blade 91 has two set tooth sets Ts11 and Ts12 consisting of three set tooth sets Ts11 and Ts12, which are formed repeatedly in the same direction and swung out by the same amount, with one straight tooth S12 interposed therebetween. It has a configuration in which it is arranged so as to swing out alternately to the left and right while being sandwiched between the two. The set tooth set Ts11 has left set teeth L11 to L13, and the set tooth set Ts12 has right set teeth R11 to R13. It should be noted that the straight teeth S11 and S12 may not be replaced with a straight tooth set each including a plurality of straight teeth as long as the relationship between the tip pitch and the number of continuous set teeth, which will be described later, is maintained. It is possible.

(Example 3)
3A and 3B are views of a band saw blade 92 of Example 3 of the band saw blade according to the embodiment of the present invention, FIG. 3(a) being a partial side view and FIG. 3(b) being a partial bottom view.
The band saw blade 92 has a body portion 92a formed into an endless loop by joining band-shaped ends. A tooth portion 92b is formed on one edge of the body portion 92a.

In the tooth portion 92b, a tooth set 92s, which is a set of a plurality of teeth in which pitches P21 to P29 and P210 between tooth tips are formed as a pitch pattern P2, is continuously and repeatedly formed.
Ten teeth are included in the tooth set 92s, and when viewed from the leading end of the band saw blade 92 in the running direction, the straight teeth S21, the left set teeth L21, the left set teeth L22, the left set teeth L23, the left set teeth L24, A straight tooth S22, a right set tooth R21, a right set tooth R22, a right set tooth R23, and a right set tooth R24. The tips of the teeth included in the tooth set 92s are all at the same height position in the vertical direction.

The left set teeth L21 to L24 are set teeth formed by bending the teeth of the tooth portion 92b to the left with respect to the body portion 92a at a position close to the body portion 92a. The swing-out amount of the left set tooth L21 to the left set tooth L24 is equal to the swing-out amount dL.
The right set teeth R21 to R24 are set teeth formed by bending the teeth of the tooth portion 92b to the right with respect to the body portion 92a at a position close to the body portion 92a. The swing-out amount of the right set tooth R21 to the right set tooth R24 is equal to the swing-out amount dR. The swing amount dL and the swing amount dR are equal.

The tooth portion 92b of the band saw blade 92 has two set tooth sets Ts21 and Ts22 consisting of four set tooth sets Ts21 and Ts22, which are formed repeatedly in the same direction and swung out by the same amount, with one straight tooth S22 interposed therebetween. It has a configuration in which it is arranged so as to swing out alternately to the left and right while being sandwiched between the two. The set tooth set Ts21 has left set teeth L21 to L24, and the set tooth set Ts22 has right set teeth R21 to R24. It should be noted that the straight teeth S21 and S22 may not be replaced with a straight tooth set each including a plurality of straight teeth as long as the relationship between the tip pitch and the number of continuous set teeth, which will be described later, is maintained. It is possible.

(Example 4)
4A and 4B are views of a band saw blade 93 of Example 4 of the band saw blade according to the embodiment of the present invention, FIG. 4A being a partial side view and FIG. 4B being a partial bottom view.
The band saw blade 93 has a trunk portion 93a formed into an endless loop shape by joining band-shaped ends. A tooth portion 93b is formed on one edge portion of the body portion 93a.

In the tooth portion 93b, a tooth set 93s, which is a set of a plurality of teeth formed with pitches P31 to P39 and P310 to P312 between the tooth tips as a pitch pattern P3, is continuously and repeatedly formed.
There are 12 teeth included in the tooth set 93s, and when viewed from the leading end of the band saw blade 93 in the traveling direction, the straight teeth S31, the left set teeth L31, the left set teeth L32, the left set teeth L33, the left set teeth L34, A left set tooth L35, a straight tooth S32, a right set tooth R31, a right set tooth R32, a right set tooth R33, a right set tooth R34, and a right set tooth R35. The tips of the teeth included in the tooth set 93s are all at the same height position in the vertical direction.

The left set teeth L31 to L35 are set teeth formed by bending the teeth of the tooth portion 93b to the left with respect to the body portion 93a at a position close to the body portion 93a. The swing-out amount of the left set tooth L31 to the left set tooth L35 is equal to the swing-out amount dL.
The right set teeth R31 to R35 are set teeth formed by bending the teeth of the tooth portion 93b to the right with respect to the body portion 93a at a position close to the body portion 93a. The swing-out amount of the right set tooth R31 to the right set tooth R35 is equal to the swing-out amount dR. The swing amount dL and the swing amount dR are equal.

The tooth portion 93b of the band saw blade 93 has two set tooth sets Ts31 and Ts32 consisting of five set tooth sets Ts31 and Ts32, which are formed repeatedly in the same direction and by the same amount, with one straight tooth S32 interposed therebetween. It has a configuration in which it is arranged so as to swing out alternately to the left and right while being sandwiched between the two. The set tooth set Ts31 has left set teeth L31 to L35, and the set tooth set Ts32 has right set teeth R31 to R35. It should be noted that the straight teeth S31 and S32 may not be replaced with a straight tooth set each including a plurality of straight teeth as long as the relationship between the tip pitch and the number of continuous set teeth, which will be described later, is maintained. It is possible.

In the band saw blades 90 to 93 of Examples 1 to 4, the straight teeth are formed before the continuous sets of set teeth Ts01 to Ts31 swung leftward during cutting travel cut the left side and bottom of the cutting path. S01 to S31 are cut first. Also, before the continuous set tooth sets Ts02 to Ts32 swung out to the right cut the right side surface and the bottom surface of the cutting path, the straight teeth S02 to S32 cut first.

The straight teeth S01 to S31 and S02 to S32 of the band saw blades 90 to 93 reduce the cutting load applied to the set tooth sets Ts01 to Ts31 and the set tooth sets Ts02 to Ts32. Therefore, the set teeth included in the set tooth sets Ts01 to Ts31 and the set tooth sets Ts02 to Ts32 are less likely to suffer from chipping or other defects.

Further, the band saw blades 90 to 93 have straight teeth S02 to S32 arranged between the continuous set tooth sets Ts01 to Ts02 to Ts02 to 32, which are swung out to the left and right, so that straight cutting can be performed. sex is improving. It should be noted that the straight teeth S01 to S32 may not be replaced with a straight tooth set each including a plurality of straight teeth as long as the relationship between the tip pitch and the number of continuous set teeth, which will be described later, is maintained. It is possible.

In the band saw blades 90 to 93 of Examples 1 to 4, the number of continuous set teeth included in each of the set tooth sets Ts01 to Ts31 and the set tooth sets Ts02 to Ts32 is referred to as the set tooth number n (n is an integer of 2 or more). ).
That is, the band saw blade 90 of Example 1 has n=2, the band saw blade 91 of Example 2 has n=3, the band saw blade 92 of Example 3 has n=4, and the band saw blade 93 of Example 4 has n=5. be.

In the band saw blades 90 to 93 of Examples 1 to 4, the set tooth sets Ts01 to Ts31 and the set tooth sets Ts02 to Ts32 have the same swing-out amount dL and dR.
That is, in the set teeth sets Ts01 to Ts31 and Ts02 to Ts32, since the set teeth dL and dR are all the same and continuous, the left side surface of the member to be cut is The reaction force received from the right side is divided by 1/n for each set tooth.

Therefore, the load applied to the set teeth included in each of the continuous sets of set teeth Ts01 to Ts31 and Ts02 to Ts32 is greatly reduced to 1/n based on the number of set teeth n.
As a result, the band saw blades 90 to 93 are less susceptible to tooth chipping.

Next, the relationship between the pitch between the tooth tips and the number of set teeth n of a band saw blade used for a light-load saw will be described in detail with reference to FIGS. 5 and 6. FIG. In the following description, the pitch is distinguished between the pitch PM in mm and the pitch PN in the number of teeth per inch (number of teeth/inch).
FIG. 5 is a diagram showing the same-type set tooth-to-tooth range AR, and FIGS. 5(a) to 5(d) are schematic diagrams showing the tooth rows of the band saw blades 90 to 93, respectively. FIG. 6 is a diagram showing the application relationship between the pitch PM and Examples 1-4.

First, the following conditions (1) and (2) are applied as premises to the light-load sawing machine.
(1) The running speed Vr (mm/min) of the band saw blade is 100×10 ³ mm/min.
(2) The descending speed Vd10 of the band saw blade with a pitch PN of 10 is constant at 120 mm/min.
Also, in light-load saw machines, the following relationship (3) is recognized empirically.
(3) The lower limit of the depth of cut Cmin (mm) is 0.006 mm, and the upper limit of the depth of cut Cmax (mm) is 0.006 mm. 025 mm.

Under these preconditions and relationships, the cutting depth C (mm) per tooth to which the maximum load of the band saw blade is applied in cutting on a light-load saw is given by the following (Equation 1).
C=Vd/(Vr/maximum load pitch) (Formula 1)

The maximum load pitch is the pitch PM times the multiple. The multiple is the number of teeth of the band saw blades 90 to 93, including the last tooth of the set tooth set swung in one direction of the adjacent tooth set, up to the front of the set tooth set swung in the same direction of the adjacent tooth set. ns.
Specifically, the number of teeth ns is the number of teeth in the uniform set tooth range AR shown in FIG. FIG. 5 is a diagram showing the same-type set tooth range AR, and FIGS. 5(a) to 5(d) are schematic diagrams showing the tooth pattern of the band saw blades 90 to 93, respectively.
As shown in FIGS. 5(a) to 5(d), the number of teeth ns included in the homogeneous set tooth range AR is 5 to 8 for the band saw blades 90 to 93, respectively.

Vd (mm/min) is Vd10×(pitch reduction rate ΔPN),
The pitch reduction rate ΔPN is indicated by pitch PM/2.54.

Therefore, (Formula 1) is
C=Vd10×PM/[2.54×Vr/(PM×ns)]
C=Vd10×PM ² ×ns/(2.54×Vr) (Formula 2)
becomes.
Arranging (Equation 2) by PM and substituting Vd10=120 mm/min and Vr=100×10 ³ mm/min yields
PM=[2.54×C×100×10 ³ /(120×ns)] ^1/2 (Formula 3) is obtained.

For (Equation 3), 5 to 8 are substituted for each of the band saw blades 90 to 93 as ns, and 0.006 mm of the lower limit of cutting depth Cmin and 0.025 mm of the upper limit of cutting depth Cmax are substituted as the depth of cut C. Then, the lower limit pitch PM1 and the upper limit pitch PM2 of the pitch PM are calculated for each of the band saw blades 90 to 93, and the preferred pitch ranges PMg1 to PMg4 of the pitch PM are obtained (see FIG. 6).

The calculation results are as follows.
Band saw blade 90 PM1=1.59 mm, PM2=3.25 mm
Band saw blade 91 PM1=1.45 mm, PM2=2.97 mm
Band saw blade 92 PM1=1.35 mm, PM2=2.75 mm
Band saw blade 93 PM1=1.26 mm, PM2=2.57 mm

FIG. 6 is a diagram showing the application relationship between the band saw blades 90-93 of Examples 1-4 and the pitch PM.
For example, in FIG. 6, the preferred pitch range of the band saw blade 91 is the pitch range PMg2 from the lower limit pitch PM1 of 1.45 mm to the upper limit pitch PM2 of 2.97 mm.

From the overlapping pattern of the pitch ranges PMg1-PMg4, the pitch PM is divided into seven ranges T1-T7.
The range T1 preferably corresponds only to the band saw blade 93 with a pitch PM of 1.26 or more and less than 1.35 mm.
The band saw blade 93 and the band saw blade 92 preferably correspond to the pitch PM of 1.35 or more and less than 1.45 mm in the range T2.
The band saw blades 93 to 91 preferably correspond to the range T3 when the pitch PM is 1.45 or more and less than 1.59 mm.
The band saw blades 93 to 90 preferably correspond to the range T4 when the pitch PM is 1.59 or more and less than 2.57 mm.
The band saw blades 92 to 90 preferably correspond to the range T5 when the pitch PM is 2.57 or more and less than 2.75.
The band saw blade 91 and the band saw blade 90 preferably correspond to the pitch PM of 2.75 or more and less than 2.97 mm in the range T6.
The band saw blade 90 preferably corresponds to the range T7 when the pitch PM is 2.97 or more and less than 3.25.

That is, in the first set tooth set Ts01 to Ts31 and the second set tooth set Ts02 to Ts32, the pitch of the tooth tip and the number of set teeth n are
a: 1.26 mm or more and less than 1.35 mm, n=5
b: 1.35 mm or more and less than 1.45 mm, n = 4 or 5
c: 1.45 mm or more and less than 1.59 mm, n = 3 to 5 d: 1.59 mm or more and less than 2.57 mm, n = 2 to 5 e: 2.57 mm or more , if less than 2.75 mm, n = 2 to 4 f: if 2.75 mm or more and less than 2.97 mm, n = 2 or 3
g: 2.97 mm or more and less than 3.25 mm, n = 2
are divided into groups a to g indicated by .

By dividing the range T1 to T7, the pitch to be selected when manufacturing a band saw blade having an uneven tooth row can be grasped.
For example, when the tooth top pitch of the tooth row is a unequal pitch called 8/12P, which is a combination of pitches PN of 8 and 12, as shown in FIG. In the corresponding range T7, the band saw blade 90 preferably has two continuous set teeth. Further, the pitch PN=12 is preferably set in a range T4 corresponding to the band saw blades 90 to 93, and the set teeth of the band saw blades 90 to 93 are set to have a continuous number of teeth of any one of 2 to 5 teeth.

In addition, when the tooth top pitch of the tooth row is an uneven pitch called 12/16P, which is a combination of pitches PN of 12 and 16, as shown in FIG. In the corresponding range T4, the set teeth of the band saw blades 90 to 93 preferably have 2 to 5 teeth. In addition, the pitch PN=16 is preferably set such that the set teeth of the band saw blades 91 to 93 are continuous with the number of teeth of any one of 3 to 5 in the corresponding range T3.

In addition, when the tip pitch of the tooth row is a nonuniform pitch called 14/18P, which is a combination of pitches PN of 14 and 18, as shown in FIG. In the corresponding range T4, the set teeth of the band saw blades 90 to 93 preferably have 2 to 5 teeth. Moreover, the pitch PN=18 is set such that the set teeth of the band saw blades 92 and 93 are preferably continuous with one of four teeth and five teeth in the corresponding range T2.

Thus, based on FIG. 6, a band saw blade having a suitable continuous set tooth number ns for the pitch PM (PN) can be selected from the band saw blades 90-93. As a result, it is possible to select a band saw blade that is suitable for the material, shape, and other characteristics of the material to be cut, and to perform good cutting that is less prone to tooth chipping regardless of the material of the material to be cut and the distance of the cutting path. can.

The embodiments of the present invention are not limited to the configurations described above, and modifications may be made without departing from the gist of the present invention.

In the band saw blades 91 to 93 of Examples 2 to 4, it has been explained that the swing-out amount of the set teeth is the same for all the set teeth included in the set tooth sets that are swung in the same direction, but the present invention is limited to this. isn't it. It is sufficient that set teeth with different set amounts are mixed in the set tooth set, and the set teeth set with the maximum set amount are arranged at least at the top and the end of the set set. This will be described with reference to FIGS. 7 and 8. FIG.

7A and 7B are views of a band saw blade 91A which is a modified example of the band saw blade 91. FIG. 7A is a partial side view, and FIG. 7B is a partial bottom view. 8A and 8B are diagrams of a band saw blade 93A which is a modified example of the band saw blade 93, FIG. 8A being a partial side view and FIG. 8B being a partial bottom view.

As shown in FIG. 7(b), the band saw blade 91A has set tooth sets Ts71 and Ts72 instead of the set tooth sets Ts11 and Ts12 of the band saw blade 91. As shown in FIG.
In the set tooth set Ts71, two left set teeth out of the left set teeth L11 to L13 have the maximum set amount dL, and the remaining one left set tooth (in this example, the left set tooth L12). is a swing amount dL2 smaller than the swing amount dL.
Similarly, in the set tooth Ts72, two of the right set teeth R11 to R13 have the maximum set amount dR, and the remaining one right set tooth (in this example, the right set tooth R12) has a swing amount dL2 smaller than the swing amount dL.

As shown in FIG. 8(b), the band saw blade 93A has set tooth sets Ts81 and Ts82 instead of the set tooth sets Ts31 and Ts32 of the band saw blade 93. As shown in FIG.
In the set tooth set Ts81, three left set teeth out of the left set teeth L31 to L35 have the maximum set amount dL, and the remaining two left set teeth (in this example, the left set teeth L32, L34) has a swing amount dL2 smaller than the swing amount dL.
Similarly, in the set tooth Ts82, three right set teeth out of right set teeth R31 to R35 have the maximum set amount dR, and the remaining two right set teeth (in this example, right set teeth R32, R34) has a swing amount dL2 smaller than the swing amount dL.

Here, the straight teeth S01 to S31 are the first straight teeth, the straight teeth S02 to S32 are the second straight teeth, the first set tooth group is the set tooth group Ts01 to Ts31, and the second set tooth group is the set tooth group. Ts02 to Ts32.
In this case, as described above, the band saw blades 90 to 93 have a plurality of tooth sets 90s to 93s that are repeatedly formed, and the tooth sets 90s to 93s are connected to the first straight teeth S01 to S31, to one of the left and right teeth. The first set tooth set Ts01 to Ts31, the second straight teeth S02 to S32, and the second set tooth set Ts02 to Ts32 set to the other left and right are provided in this order, and the first set tooth The set Ts01 to Ts31 and the second set tooth set Ts02 to Ts32 include at least two set teeth set with the same maximum set amount dL and dR, and n (an integer equal to or greater than 2) continuously formed. band saw blade with set teeth.

With band saw blades 91A and 93A as representative examples, if a set of set teeth includes set teeth with different set amounts and has at least two set teeth that are swung out with a maximum set amount, cutting is possible. The reaction force received from the right and left side surfaces of the member to be cut is suppressed to at least 1/2 or less at each of the set teeth. Therefore, the load applied to each set tooth is reduced to 1/2 or less.
As a result, band saw blades, typically band saw blades 91A and 93A, each having at least two set teeth that are swung out by the maximum swing amount in each set tooth set, are less susceptible to tooth chipping.

90, 91, 92, 93, 91A, 93A Band saw blades 90a, 91a, 92a, 93a, 91Aa, 93Aa Body portions 90b, 91b, 92b, 93b, 91Ab, 93Ab Tooth portions 90s, 91s, 92s, 93s, 91As, 93As Tooth set AR Homogeneous set tooth range dL, dL1 Left set amount dR, dR1 Right set amount L01, L02, L11 to L13, L21 to L24, L31 to L35 Left set tooth n Number of set teeth ns Number of teeth PM, PN Pitch PM1 Lower limit pitch PM2 Upper limit pitch PMg1 to PMg4 Pitch range P0 to P3 Pitch pattern P01 to P06, P11 to P18, P21 to P29, P210, P31 to P39, P310 to P312 Pitch R01, R02, R11 to R13, R21 to R24, R31 ~ R35 Right set teeth S01, S02, S11, S12, S21, S22, S31, S32, S121, S122 Straight teeth T1 to T7 Range Ts01, Ts02, Ts11, Ts12, Ts21, Ts22, Ts31, Ts32 Set teeth

Claims (4)

Equipped with a plurality of repeatedly formed tooth sets,
The tooth set has, in this order, a first straight tooth, a first set tooth set swung to one of the left and right sides, a second straight tooth, and a second set tooth set swung to the other left and right,
The first set tooth set and the second set tooth set include n (an integer equal to or greater than 2) set teeth continuously formed including at least two set teeth set by the same maximum set amount. band saw blade. 2. The band saw blade according to claim 1, wherein the number of set teeth of each of said first set of teeth and that of said second set of teeth are equal to n. The tooth set has one or more straight teeth between the first straight tooth and the first set tooth set or between the second straight tooth and the second set tooth set. The band saw blade according to claim 1 or claim 2. In the first set tooth set and the second set tooth set, the pitch of the tooth tip and the n are:
a: 1.26 mm or more and less than 1.35 mm, n=5
b: 1.35 mm or more and less than 1.45 mm, n = 4 or 5
c: 1.45 mm or more and less than 1.59 mm, n = 3 to 5 d: 1.59 mm or more and less than 2.57 mm, n = 2 to 5 e: 2.57 mm or more , if less than 2.75 mm, n = 2 to 4 f: if 2.75 mm or more and less than 2.97 mm, n = 2 or 3
g: 2.97 mm or more and less than 3.25 mm, n = 2
4. The band saw blade according to any one of claims 1 to 3, wherein the band saw blade includes any one of the groups of a to g, and the n satisfies the conditions of each group.

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