WO2020137720A1

WO2020137720A1 - Band saw edge

Info

Publication number: WO2020137720A1
Application number: PCT/JP2019/049509
Authority: WO
Inventors: 辻本　晋; 達也川上
Original assignee: 株式会社アマダホールディングス; 株式会社アマダマシンツール
Priority date: 2018-12-25
Filing date: 2019-12-18
Publication date: 2020-07-02
Also published as: JP2020099972A; JP6691717B1

Abstract

According to the present invention, saw tooth groups (12) each comprises: a first saw tooth small group (14) which is composed of three or more sheets of contiguous left set teeth (18, 20, 22) as a plurality of saw teeth, and three of more contiguous right set teeth (24, 26, 28) that trail or lead the left set teeth, and which includes the smallest inter-tooth pitch; and a second saw tooth small group (16) which is composed of straight teeth (30) as a plurality of saw teeth and left and right set teeth (32, 34) alternately arranged in the saw edge traveling direction, and which includes the largest inter-tooth pitch. The largest inter-tooth pitch is two or more times the smallest inter-tooth pitch, and the band width dimensions of the left set teeth (18, 20, 22, 32), the band width dimensions of the right set teeth (24, 26, 28, 34), and the band width dimension of the straight teeth (30) are set to the same dimension.

Description

Band saw blade

The present disclosure relates to a band saw blade used when cutting a work material (metal work) with a band saw machine.

ㆍGenerally, band saw blades are repeatedly equipped with a group of saw teeth that is a combination pattern of a plurality of saw teeth. Further, conventionally, a band saw blade suitable for cutting both small (thin-walled) pipe materials and solid work materials has been developed (see Patent Document 1). The structure of the band saw blade according to the prior art will be briefly described as follows.

Each sawtooth group of the band saw blade according to the prior art is composed of a plurality of sawtooths including a straight tooth, left and right first set teeth (first left set tooth and first right set tooth), and a first set of left and right set amounts. The left and right second set teeth (second left set tooth and second right set tooth) set to be smaller than the tooth ejection amount are included. The band widths of the left and right first set teeth are set to be the same as the band widths of the straight teeth, and the band widths of the left and right second set teeth are set to the band widths of the left and right first set teeth ( It is set smaller than the straight tooth width dimension). The inter-tooth pitch of a plurality of saw teeth in each saw tooth group is usually set smaller than the wall thickness of the pipe material to be cut.

When cutting a small (thin wall) pipe material (for example, outer shape 21.7 mm, wall thickness 2.8 mm) as a work material, the cutting length is relatively short. Even if the cutting resistance of each saw tooth is accumulated, the cutting resistance is small, the cutting amount of one tooth is large, and the cutting amount of the band saw blade with respect to the work material is large. Then, in addition to the straight teeth and the left and right first set teeth, the left and right second set teeth having the ejection amount and the band width set to be smaller than those of the first set teeth contribute to the cutting. As a result, the amount of cutting is distributed to each set tooth, part of the pipe material does not enter between the adjacent saw teeth, chipping of the band saw blade during cutting of the pipe material is suppressed, and the durability of the band saw blade is suppressed. It is possible to improve the sex.

On the other hand, when cutting a solid material as a work material, the cutting length is relatively long, the cutting resistance is large, and the cutting amount of the band saw blade is small. Then, only the straight teeth and the left and right first set teeth contribute to the cutting, and the left and right second set teeth hardly contribute to the cutting. In other words, the left and right second set teeth do not substantially contribute to cutting. As a result, even if the inter-tooth pitch of a plurality of saw teeth in each saw tooth group is set small, the cutting time of the solid material can be shortened by increasing the cutting efficiency of the straight teeth and the left and right first set teeth. Can be planned. That is, the band saw blade according to the prior art is a band saw blade suitable for cutting both small (thin-walled) pipe materials and solid materials.

Japanese Patent No. 4133325

By the way, according to the prior art, a band saw blade suitable for cutting both small (thin-walled) pipe materials and solid materials, such as large pipe materials and H-section steel (for example, H-section steel (400×200, thickness 8 mm, 13 mm). )) and the like have the following problems when performing cutting of a large workpiece solid material whose cutting length changes during processing.

Depending on the size of the work material, the thickness of the vertical part (flange in the case of H-section steel) and the thickness of the horizontal part (web in the case of H-section steel) increase. When cutting the horizontal part, the cutting length becomes longer, the cutting amount of the band saw blade becomes smaller, only the straight teeth and the left and right first set teeth contribute to the cutting, and the left and right second set teeth contribute to the cutting. Hard to do.

On the other hand, when the work material is large enough, the vertical part has a large wall thickness and is longer than the interdental pitch. When cutting both vertical parts, the cutting resistance is also large, and the cutting amount of the band saw blade is larger than that when cutting the horizontal part, but the left and right second set teeth do not contribute to the cutting. Further, since the band saw blade is not in contact with the work material in the intermediate portion between both vertical portions, vibration of the band saw blade is likely to occur and a load is applied only to the straight teeth and the first set teeth. As a result, chipping of the band saw blade is likely to occur.

In other words, when using a small (thin-walled) pipe band saw blade to cut a large work material whose cutting length changes during processing, it is not possible to reduce the cutting time of the work material and There is a problem that the occurrence of chipping of the blade cannot be suppressed and the durability of the band saw blade cannot be easily improved.

Therefore, the present disclosure can improve the cutting efficiency and suppress the phenomenon in which the bending sharply returns even when performing the cutting process for the small work material and the large work material whose cutting length changes. An object is to provide a band saw blade made of.

According to a first aspect of the one or more embodiments, the band saw blade is repeatedly provided with a group of saw teeth composed of a combination pattern of a plurality of saw teeth. Each sawtooth group includes a first sawtooth small group (continuous small set tooth group) composed of three or more left set teeth which are continuous as a plurality of saw teeth and three or more right set teeth which are continuous. No. 2 saw tooth small, which is composed of straight teeth and two or more left and right set teeth or two or more left and right set teeth as the saw tooth, and is set to an inter-tooth pitch larger than the inter-tooth pitch of the first saw tooth small group. Group (large pitch sawtooth small group). The set teeth of the first small saw tooth group and the set tooth of the second small saw tooth group have the same amount of extension.

According to a second aspect of the one or more embodiments, the band saw blade is repeatedly provided with a saw tooth group consisting of a combination pattern of a plurality of saw teeth. Each sawtooth group includes a first sawtooth small group (continuous small set tooth group) composed of three or more left set teeth which are continuous as a plurality of saw teeth and three or more right set teeth which are continuous. Of at least one straight tooth and at least one pair of left and right set teeth alternately arranged along the traveling direction of the saw blade as the saw tooth of the first saw tooth, and the inter-tooth pitch larger than the inter-tooth pitch of the first saw tooth small group. It is composed of a set second sawtooth small group (large pitch sawtooth small group). The first saw tooth small group and the second saw tooth small group have the same band width dimension, and the set teeth of the first saw tooth small group and the set tooth of the second saw tooth small group have the same amount of extension.

In the first aspect and the second aspect, the first sawtooth subgroup includes a minimum intertooth pitch of the sawtooth group, and the second sawtooth subgroup includes a maximum intertooth pitch of the saw tooth group. The maximum interdental pitch may be twice or more the minimum interdental pitch.

According to a third aspect of the one or more embodiments, the band saw blade is repeatedly provided with a saw tooth group consisting of a combination pattern of a plurality of saw teeth. Each sawtooth group is composed of three or more left set teeth which are continuous as a plurality of saw teeth and three or more right set teeth which are continuous or succeeding or preceding them, and the first sawtooth small group including the minimum inter-tooth pitch. The second sawtooth small group including a group (continuous set of small set teeth) and right and left set teeth alternately arranged along the saw blade advancing direction as a plurality of saw teeth and including the maximum inter-tooth pitch. (Large pitch sawtooth small group). The maximum inter-tooth pitch is twice or more the minimum inter-tooth pitch, and the band width dimension of the left set tooth, the band width dimension of the right set tooth, and the band width dimension of the straight tooth are the same. The set amount of the left set tooth and the set amount of the right set tooth are set to the same set amount.

In the first to third aspects, the gullet area of the leading tooth of the three or more left set teeth is set to be larger than the gullet area of each left set tooth excluding the leading tooth. The gullet area of the leading tooth of the above right set teeth is set larger than the gullet area of each right set tooth excluding the leading tooth, and the gullet area of the trailing tooth of the first sawtooth small group is May be set larger than the Galette area of the preceding tooth.

In the first to third aspects, the number of the first sawtooth small groups forming each sawtooth group may be plural. In this case, the second sawtooth subgroup may be arranged between the plurality of first sawtooth subgroups in each sawtooth group. The leading and trailing teeth of the first sawtooth small group may be left and right set teeth (left set teeth and right set teeth). Further, the number of saw teeth forming each saw tooth group may be 20 or more.

According to the present disclosure, even when performing cutting of a large work material whose cutting length changes during cutting, the occurrence of chipping of the band saw blade is suppressed while shortening the cutting time of the work material. Thus, the durability of the band saw blade can be improved.

FIG. 1A is a left side surface part showing a part of the band saw blade according to the first embodiment, and FIG. 1B is a part of the band saw blade according to the first embodiment from the cutting edge side (tooth side). It is the figure seen. FIG. 2 is an enlarged view showing a saw tooth group of the band saw blade according to the first embodiment. 3A is a left side view showing a part of the band saw blade according to the second embodiment, and FIG. 3B is a view of a part of the band saw blade according to the second embodiment as seen from the cutting edge side. .. FIG. 4 is an enlarged view showing a saw tooth group of the band saw blade according to the second embodiment. FIG. 5A is a left side view showing a part of the band saw blade according to the third embodiment, and FIG. 5B is a view of a part of the band saw blade according to the third embodiment as seen from the cutting edge side. .. FIG. 6A is an enlarged view showing the leading-side saw tooth (leading tooth) to the middle-side saw tooth in the saw tooth group of the band saw blade according to the third embodiment. FIG. 6B is an enlarged view showing saw blades from the middle side to the rear side (rear side) in the saw tooth group of the band saw blade according to the third embodiment. FIG. 7A is a left side surface portion of a part of the band saw blade according to the fourth embodiment, and FIG. 7B is a view of a part of the band saw blade according to the fourth embodiment as seen from the cutting edge side. FIG. 8A is an enlarged view showing saw blades from the leading side to the intermediate side in the saw tooth group of the band saw blade according to the fourth embodiment. FIG. 8B is an enlarged view showing the saw teeth from the intermediate side to the rear side in the saw tooth group of the band saw blade according to the fourth embodiment. FIG. 9A is a left side view of a part of the band saw blade according to the fifth embodiment, and FIG. 9B is a view of a part of the band saw blade according to the fifth embodiment as seen from the cutting edge side. FIG. 10A is an enlarged view showing saw blades from the leading side to the intermediate side in the saw tooth group of the band saw blade according to the fifth embodiment. FIG. 10B is an enlarged view showing the saw teeth from the intermediate side to the rear side in the saw tooth group of the band saw blade according to the fifth embodiment.

First to fifth embodiments of the present disclosure will be described with reference to the drawings.

In the specification and claims of the present application, the “left-right direction” refers to the left and right when viewed from the saw blade traveling direction (the traveling direction of the band saw blade) in a state where the blade tip (tooth tip) of the band saw blade faces downward. Refers to the direction. “Preceding” means leading in the saw blade traveling direction, and “subsequent” means succeeding in the saw blade traveling direction. The "saw blade center line" refers to a line passing through the center of the band saw blade in the left-right direction. "Alternating arrangement" is meant to include being arranged alternately at least once.

"Tooth height dimension" refers to the dimension from an imaginary reference line (not shown) along the root of the body of the band saw blade to the tip of the tooth. The longer the distance to the tip and the smaller the tooth height dimension, the shorter the distance from the root to the tip. "Band width dimension" means the dimension from the saw spine (not shown) to the tooth tip in the body of the band saw blade. The larger the band width dimension, the longer the distance from the saw spine to the tooth tip. The smaller the band width dimension, the shorter the distance from the saw spine to the tooth tip.

”The inter-tooth pitch” is the pitch (distance) between adjacent tooth tips, and the “functional pitch” is the pitch (distance) between the tooth tips that perform the same function. The “variable pitch” is a general term for a tooth tip pitch group that is set (designed) by changing the pitch (distance) between the tooth tips in the sawtooth group differently.

In the drawings, "L" indicates the left direction, "R" indicates the right direction, and "F" indicates the saw blade moving direction.

(First embodiment)
As shown in FIGS. 1A, 1B, and 2, the band saw blade 10 according to the first embodiment is used when a work material (metal work) is cut by a band saw machine (not shown). It is a cutting tool used. The body of the band saw blade 10 is made of alloy steel having high toughness, and the tip (tooth) of the band saw blade 10 is made of high speed tool steel (high speed steel).

The band saw blade 10 is repeatedly provided with a saw tooth group 12 including a combination pattern of a plurality of saw teeth. Each sawtooth group 12 is composed of one first sawtooth small group (continuous set tooth small group) 14 and one second sawtooth small group (large pitch sawtooth small group) 16 following the first sawtooth small group 14. .. The first sawtooth small group 14 is composed of a plurality of consecutive left set

teeth

18, 20, 22 and three consecutive right set

teeth

24, 26, 28 following them as a plurality of saw teeth. .. The second sawtooth small group 16 includes, as a plurality of sawteeth, straight teeth 30, and left and right set teeth 32, 34 (left set teeth 32) that precede the straight teeth 30 and are alternately arranged along the saw blade moving direction. And the right set tooth 34). That is, each saw tooth group 12 is composed of nine saw teeth.

In addition, instead of the continuous three

right set teeth

24, 26, 28 following the three continuous left set

teeth

18, 20, 22, the preceding three continuous left set

teeth

18, 20, 22 You may. Three consecutive left set

teeth

18, 20, 22 and three consecutive right set

teeth

24, 26, 28 are provided as four or more consecutive left set teeth (not shown) and four or more consecutive right set teeth. You may change to a set tooth (illustration omitted).

The second sawtooth small group 16 is set to have an interdental pitch larger than the intertooth pitch (average interdental pitch) of the first sawtooth small group 14. The first sawtooth subgroup 14 includes two sawtooths forming the smallest interdental pitch in the sawtooth group 12. The second small saw tooth group 16 includes two saw teeth forming the maximum inter-tooth pitch in the saw tooth group 12.

The plurality of saw teeth in each saw tooth group 12 are configured by two types of inter-tooth pitch Pa, Pb (Pb=2Pa). The plurality of saw teeth in each saw tooth group 12 may be configured with three or more variable pitches.

The tooth height dimension of the left set

teeth

18, 32, the tooth height dimension of the right set

teeth

24, 34, and the tooth height dimension of the straight tooth 30 are set to be the same. The tooth heights of the left set

teeth

20 and 22 and the tooth heights of the right set

teeth

26 and 28 are set to be the same. The left set

teeth

18, 20, 22, 32 and the right set

teeth

24, 26, 28, 34 are symmetrical with respect to the saw blade center line, respectively. The amount of swaying out of the left set

teeth

18, 20, 22, 32 and the amount of squeezing out of the right set

teeth

24, 26, 28, 34 are set to the same amount. The band width dimension of the left set

teeth

18, 20, 22, 32, the band width dimension of the right set

teeth

24, 26, 28, 34 and the band width dimension of the straight tooth 30 are set to the same band width dimension, respectively.

The left set tooth 18, which is the leading tooth of the three

left set teeth

18, 20, and 22, is composed of the tooth tip and the tip of the left set tooth 32, which is a saw tooth of the same shape preceding the left set tooth 18. Since the distance (functional pitch) is long, a relatively large cutting action is achieved. The right set tooth 24, which is the leading tooth of the three

right set teeth

24, 26, 28, is the tip of the tooth and the tip of the right set tooth 34, which is a saw tooth of the same shape preceding the right set tooth 24. A relatively large cutting action is achieved due to the long distance between the and. Further, since the left set tooth 32, which is the trailing tooth of the first sawtooth small group 14, has a long distance between its tip and the tip of the left set tooth 22, which is a saw tooth of the same shape and precedes the left set tooth 32, Has a relatively large cutting effect.

Correspondingly, the gullet area of the left set teeth 18 (the hatched portion) is set larger than the gullet area of the left set

teeth

20, 22. Further, the gullet area of the right set teeth 24 (the hatched portion) is set to be larger than the gullet areas of the right set

teeth

26 and 28. Further, the gullet area of the left set tooth 32, which is the trailing tooth of the first sawtooth small group 14, (the portion hatched) is set larger than the gullet area of the right set tooth 28, which is the leading tooth of the trailing tooth. ing.

Next, the operation and effect of the first embodiment of the present disclosure will be described.

When cutting a large pipe material or a large work material having a long cutting length such as an H-shaped steel, the cutting amount of the band saw blade 10 becomes small. Then, all the saw teeth in the second saw tooth small group 16 and the left set tooth 18 and the three right set tooth which are the leading teeth of the three

left set teeth

18, 20, 22 in the first saw tooth small group 14. Only the right set tooth 24, which is the leading tooth of 24, 26 and 28, contributes to the cutting. The two

left set teeth

20, 22 and the two

right set teeth

26, 28 in the first sawtooth small group 14 are less likely to contribute to cutting. In other words, the two

left set teeth

20, 22 and the two

right set teeth

26, 28 in the first sawtooth small group 14 are substantially in a non-working state. However, by providing the

continuous set teeth

18, 20, 22, 24, 26, 28 having the same band width dimension and the same amount of protrusion, continuous tooth chipping is prevented and the band saw blade 10 becomes strong against cutting accompanied by vibration. Further, even if the inter-tooth pitch of the plurality of saw teeth in the first saw tooth small group 14 is set small, the substantial inter-tooth pitch of the plurality of saw teeth in the saw tooth group 12 is increased. Thereby, the cutting efficiency of the straight teeth 30, the left set

teeth

32 and 18, and the right set 34 and 24 can be improved.

In particular, the gullet areas of the left set teeth 18, the right set teeth 24, and the left set teeth 32, which have a relatively large cutting action, are set to be large as described above. Therefore, clogging due to chips can be suppressed, and the cutting efficiency of the band saw blade 10 can be further increased.

On the other hand, even if the band saw blade 10 cuts a work material having a short cutting length that is easily accompanied by vibration, not only all the saw teeth in the second saw tooth small group 16 but also all the saw teeth in the first saw tooth small group 14 contribute to the cutting. To do. As a result, even if the band saw blade 10 is vibrated, it is possible to sufficiently suppress the phenomenon in which the bending of the entire band saw blade 10 suddenly returns and to stabilize the band saw blade 10.

Therefore, according to the first embodiment of the present disclosure, even when cutting a large work material whose cutting length changes during cutting, chipping of the band saw blade 10 is attempted while shortening the cutting time of the work material. It is possible to improve the durability of the band saw blade 10 by suppressing the occurrence of

(Second embodiment)
As shown in FIGS. 3A, 3B and 4, the band saw blade 36 according to the second embodiment has the same configuration as the band saw blade 10 according to the first embodiment (see FIG. 1). doing. Hereinafter, among the configurations of the band saw blade 36, configurations different from the band saw blade 10 will be mainly described. Among the plurality of constituent elements of the band saw blade 36, those corresponding to the constituent elements of the band saw blade 10 are designated by the same reference numerals in the drawings.

The band saw blade 36 is repeatedly provided with a saw tooth group 38 which is a combination pattern of a plurality of saw teeth. The sawtooth group 38 includes two first sawtooth small groups (continuous small set teeth) 14 and one second sawtooth small group 14 (14A, 14B) that follows the second sawtooth small group (large pitch sawtooth small group). Group) 16. The two first sawtooth subgroups 14 (14A, 14B) are the first sawtooth subgroup 14A and the first sawtooth subgroup 14B that follows the first sawtooth subgroup 14A. That is, each saw tooth group 38 is configured by 15 saw teeth.

Then, according to the second embodiment of the present disclosure, since the saw tooth group 38 has the two first saw tooth small groups 14 (14A, 14B), even if the band saw blade 36 is vibrated, the band saw blade 36 is sufficiently moved. Can be stabilized. Therefore, according to the second embodiment of the present disclosure, the effect of the first embodiment of the present disclosure can be further enhanced.

(Third Embodiment)
As shown in FIGS. 5A, 5B, 6A, and 6B, the band saw blade 40 according to the third embodiment is similar to the band saw blade 10 (see FIG. 1) according to the first embodiment. It has the configuration of. Hereinafter, among the configurations of the band saw blade 40, configurations different from the band saw blade 10 will be mainly described. Among the plurality of constituent elements of the band saw blade 40, those corresponding to the constituent elements of the band saw blade 10 are designated by the same reference numerals in the drawings.

The band saw blade 40 is repeatedly provided with a saw tooth group 42 including a combination pattern of a plurality of saw teeth. The sawtooth group 42 precedes the two first sawtooth small groups (continuous small set teeth) 14 (14A, 14B) and the two first sawtooth small groups (continuous small set teeth) 14 (14A, 14B). It consists of one second sawtooth subgroup 44 and one second sawtooth subgroup 46 following the two first sawtooth subgroups 14 (14A, 14B).

The second sawtooth small group 44 is a plurality of sawteeth, and is a straight tooth 48 and left and right set

teeth

50, 52, 54, 56 (following the straight tooth 48 and alternately arranged along the saw blade moving direction). It is composed of

left set teeth

50 and 54 and right set teeth 52 and 56). The second small saw tooth group 46 is composed of a plurality of saw teeth, which are

straight teeth

58, 60 and left and right set

teeth

62, 64, 66, 68, 70, 72 (left) that are alternately arranged along the saw blade moving direction. It is composed of set

teeth

62, 66, 70 and right set

teeth

64, 68, 72). The straight teeth 58 are arranged between the right set teeth 68 and the left set teeth 70, and the straight teeth 60 are arranged at the rear end of the second sawtooth small group 46. That is, each saw tooth group 42 is configured by 24 saw teeth. The straight teeth 60 of the second sawtooth small group 46 can also be regarded as the straight teeth 48 of the second sawtooth small group 44 of the adjacent sawtooth group 42.

The second sawtooth

small groups

44 and 46 are set to have an interdental pitch larger than the intertooth pitch (average interdental pitch) of the first sawtooth small group 14. The first sawtooth subgroup 14 includes two sawtooths forming the minimum inter-tooth pitch in the sawtooth group 42. At least either second

sawtooth subgroup

44 or 46 comprises two sawtooths that make up the largest interdental pitch in sawtooth group 42.

The plurality of saw teeth in each saw tooth group 42 are configured by two types of inter-tooth pitch Pa, Pb (Pb=2Pa). Note that the plurality of saw teeth in each saw tooth group 42 may be configured with three or more variable pitches.

The tooth height dimension of the left set

teeth

18, 50, 54, 62, 66, 70, the tooth height dimension of the right set

teeth

24, 52, 56, 64, 68, 72, and the tooth height dimension of the

straight teeth

48, 60, 58. Are set to the same size. The tooth heights of the left set

teeth

20 and 22 and the tooth heights of the right set

teeth

26 and 28 are set to be the same. The left set

teeth

18, 20, 22, 50, 54, 62, 66, 70 and the right set

teeth

24, 26, 28, 52, 56, 64, 68, 72 are symmetrical with respect to the center line of the saw blade. Has become. Further, the amount of the left set

teeth

18, 20, 22, 50, 54, 62, 66, 70 and the amount of the right set

teeth

24, 26, 28, 52, 56, 64, 68, 72 are the same. Set to quantity. Band width dimension of

left set teeth

18, 20, 22, 50, 54, 62, 66, 70, band width dimension of

right set teeth

24, 26, 28, 52, 56, 64, 68, 72, and

straight tooth

48 , 60, 58 are set to have the same band width dimension.

The right set tooth 24, which is the leading tooth of the three

right set teeth

24, 26, and 28 in the first saw tooth small group 14A, is the tooth tip and the right set tooth that is the saw tooth of the same shape preceding the right set tooth 24. Since the distance (functional pitch) between the tooth 56 and the tooth tip is long, a relatively large cutting action is achieved. The left set tooth 18, which is the leading tooth among the three

left set teeth

18, 20, and 22 in the first saw tooth small group 14B, is a tooth tip and a saw tooth of the same shape preceding the left set tooth 18. Since the distance to the tip of the left set tooth 22 of the first sawtooth small group 14A is long, a relatively large cutting action is achieved. The right set tooth 24, which is the leading tooth of the three

right set teeth

24, 26, 28 in the first saw tooth small group 14B, is a tooth tip and a saw tooth of the same shape preceding the right set tooth 24. Since the distance to the tip of the right set tooth 28 of the small saw tooth group 14A is long, a relatively large cutting action is achieved. Further, the left set tooth 62, which is the trailing tooth of the first saw tooth small group 14B, has a long distance between the tooth tip and the tip of the left set tooth 22 of the first saw tooth small group 14B that is the preceding saw tooth of the same shape. Therefore, a relatively large cutting action is achieved.

Correspondingly, the gullet area of the right set teeth 24 (hatched portion) in the first small saw tooth group 14A is set larger than the gullet area of each right set tooth 26 (28). In addition, the gullet area of the left set teeth 18 (hatched portion) in the first sawtooth small group 14B is set larger than the gullet area of each left set tooth 20 (22). The gullet area (the hatched portion) of the right set teeth 24 in the first small saw tooth group 14B is set to be larger than the gullet area of each right set tooth 26 (28). Further, the gullet area of the left set tooth 62, which is the trailing tooth of the first saw tooth small group 14B (the portion hatched), is the same as that of the right set tooth 28 of the first saw tooth small group 14B that is the leading tooth of the trailing tooth. It is set larger than the galette area.

The gullet area of the left set teeth 18 in the first sawtooth small group 14A is set to be larger than the gullet areas of the left set

teeth

20 and 22.

The leading tooth of the two first saw tooth small groups 14 (14A, 14B) is the right set tooth 56, and the trailing tooth of the two first saw tooth small groups 14 (14A, 14B) is the left set tooth 62. Accordingly, it is possible to prevent the functional pitch related to the first sawtooth small group 14 (14A, 14B) from becoming long.

Next, the operation and effect of the third embodiment of the present disclosure will be described.

When cutting a large work material having a long cutting length such as a large pipe material or H-shaped steel, the cutting amount of the band saw blade 40 becomes small. Then, all the saw teeth in the second saw tooth

small groups

44, 46 and the left set tooth which is the leading tooth of the three

left set teeth

18, 20, 22 in each first saw tooth small group 14 (14A, 14B). Of the 18 and the three

right set teeth

24, 26, 28, only the right set tooth 24, which is the leading tooth, contributes to the cutting. The two

left set teeth

20, 22 and the two

right set teeth

26, 28 in each first sawtooth small group 14 (14A, 14B) hardly contribute to cutting. In other words, the two

left set teeth

20, 22 and the two

right set teeth

26, 28 in each first sawtooth small group 14 (14A, 14B) are substantially in a non-working state. However, by providing the

continuous set teeth

18, 20, 22, 24, 26, 28 having the same band width dimension and the same amount of protrusion, continuous tooth chipping is prevented and the band saw blade 40 becomes strong against cutting accompanied by vibration. Further, even if the inter-tooth pitch of the plurality of saw teeth in each first saw tooth small group 14 (14A, 14B) is set small, the substantial inter-tooth pitch of the plurality of saw teeth in the saw tooth group 42 is increased. ing. Thereby, the cutting efficiency of the

straight teeth

48, 58, 60, the left set

teeth

50, 54, 18, 62, 66, 70 and the right set

teeth

52, 56, 24, 64, 68, 72 can be increased.

In particular, the gullet areas of the right set tooth 24 of the first saw tooth small group 14A, the left set tooth 18 and the right set tooth 24 of the first saw tooth small group 14B, and the left set tooth 62 which have a relatively large cutting action are as described above. Is set to a large value. Therefore, clogging due to chips can be suppressed, and the cutting efficiency of the band saw blade 40 can be further increased.

Further, since the number of saw teeth forming each saw tooth group 42 is 20 or more (24), the cutting efficiency of the band saw blade 40 can be stably increased even if the cutting length is long.

On the other hand, even if the band saw blade 40 cuts a work material having a short cutting length that is easily accompanied by vibration, not only all the saw teeth in the second saw tooth

small groups

44 and 46 but also the first saw tooth small groups 14 (14A and 14B) All saw teeth in contribute to the cutting. As a result, even if the band saw blade 40 is vibrated, it is possible to sufficiently suppress the phenomenon in which the bending of the entire band saw blade 40 suddenly returns, and to stabilize the band saw blade 40.

Therefore, according to the third embodiment of the present disclosure, even when cutting a large work material whose cutting length changes during cutting, the chipping of the band saw blade 40 is attempted while shortening the cutting time of the work material. It is possible to suppress the occurrence of the occurrence of the above and improve the durability of the band saw blade 40.

(Fourth Embodiment)
As shown in FIGS. 7A, 7B, 8A, and 8B, the band saw blade 74 according to the fourth embodiment is similar to the band saw blade 40 (see FIG. 3) according to the third embodiment. It has the configuration of. Hereinafter, among the configurations of the band saw blade 74, configurations different from those of the band saw blade 40 will be mainly described. Among the plurality of constituent elements of the band saw blade 40, those corresponding to the constituent elements of the band saw blade 10 are designated by the same reference numerals in the drawings.

The plurality of sawteeth in each sawtooth group 42 are configured with variable pitches of eight types of interdental pitches P1, P2, P3, P4, P5, P6, P7 and P8. The maximum inter-tooth pitch P8 of the eight types of inter-tooth pitch is twice or more the minimum inter-tooth pitch P4. The minimum inter-tooth pitch P4 is included in the first sawtooth subgroup 14 (14A, 14B), and the maximum intertooth pitch P8 is included in either the second

sawtooth subgroup

44 or 46. It should be noted that the plurality of saw teeth in each saw tooth group 42 may be configured with nine or more variable pitches.

Then, according to the fourth embodiment of the present disclosure, in addition to the same operation and effect as the third embodiment of the present disclosure, cutting noise can be reduced and the working environment can be improved.

(Fifth Embodiment)
As shown in FIGS. 9A, 9B, 10A, and 10B, the band saw blade 76 according to the fifth embodiment is the band saw blade 40 according to the third embodiment (FIG. 5A, It has the same configuration as that shown in FIG. Hereinafter, among the configurations of the band saw blade 76, configurations different from the band saw blade 40 will be mainly described. Among the plurality of constituent elements of the band saw blade 76, those corresponding to the constituent elements of the band saw blade 40 are designated by the same reference numerals in the drawings.

The band saw blade 76 is repeatedly provided with a saw tooth group 78 including a combination pattern of a plurality of saw teeth. The saw tooth group 78 includes two first saw tooth small groups (continuous set tooth small groups) 14 (14A, 14B) and a second saw tooth small group (large saw tooth small group 14 (14A, 14B)) preceding the two first saw tooth small groups 14 (14A, 14B). Pitch saw tooth small group) 80, a second saw tooth small group (large pitch saw tooth small group) 82 arranged between the two first saw tooth small groups 14 (14A, 14B), and two first saw tooth small groups 14 And a second small group of sawtooths (large group of sawtooths) 84.

The second saw tooth small group 80 excludes the left set tooth 54 and the right set tooth 56 from the second saw tooth small group 44 of the band saw blade 40. In other words, the second small saw tooth group 80 includes, as a plurality of saw teeth, the straight teeth 48 and the left and right set teeth 50, 52 (following the straight teeth 48 and alternately arranged along the saw blade moving direction). It is composed of a left set tooth 50 and a right set tooth 52). Further, the second saw tooth small group 82 excludes the straight tooth 60, the left set tooth 62, and the right set tooth 64 from the second saw tooth small group 46 of the band saw blade 40. In other words, the second small saw tooth group 82 includes, as a plurality of saw teeth, the straight teeth 58 and the left and right set

teeth

66, 68, 70, 72 (the left set teeth that are alternately arranged along the saw blade traveling direction). 66, 70 and right set teeth 68, 72).

The second saw tooth small group 84 excludes the straight tooth 60, the left set tooth 70, and the right set tooth 72 from the second saw tooth small group 46 of the band saw blade 74. In other words, the second small saw tooth group 84 includes, as a plurality of saw teeth, the straight teeth 58 and the left and right set

teeth

62, 64, 66, 68 (the left set teeth that are alternately arranged along the saw blade moving direction). 62, 66 and right set teeth 64, 68). That is, the saw tooth group 78 is configured by 24 saw teeth. The straight teeth 58 of the second sawtooth small group 84 can also be regarded as the straight teeth 48 of the second sawtooth small group 80 of the adjacent sawtooth group 78.

The plurality of saw teeth in each saw tooth group 78 are configured with variable pitches of eight types of inter-tooth pitches P1, P2, P3, P4, P5, P6, P7 and P8. The second sawtooth small group 80.82, 84 is set to have an interdental pitch larger than the intertooth pitch (average interdental pitch) of the first sawtooth small group 14. The maximum inter-tooth pitch P4 of the eight types of inter-tooth pitch is twice or more the minimum inter-tooth pitch P3. The minimum inter-tooth pitch P3 is included in the first sawtooth small group 14 (14A, 14B), and the maximum intertooth pitch P4 is included in any of the second sawtooth

small groups

80, 82, 84. It should be noted that the plurality of saw teeth in each saw tooth group 78 may be configured with nine or more variable pitches.

The right set tooth 24, which is the leading tooth of the three

right set teeth

24, 26, 28 in the first saw tooth small group 14A, is a tooth tip and a saw tooth of the same shape preceding the right set tooth 24. Since the distance (functional pitch) to the tooth tip of the right set tooth 52 of the small saw tooth group 80 is long, a relatively large cutting action is achieved. The right set tooth 24, which is the leading tooth of the three

right set teeth

24, 26, 28 in the first saw tooth small group 14B, is a tooth tip and a saw tooth of the same shape preceding the right set tooth 24. Since the distance between the right set teeth 72 of the small saw tooth group 82 and the tooth tips is long, a relatively large cutting action is achieved. Further, the left set tooth 66 of the second saw tooth small group 82 which is the trailing tooth of the first saw tooth small group 14A and the left set tooth 22 of the first saw tooth small group 14A which is the preceding saw tooth of the same saw tooth shape. Since the distance to the tooth tip is long, a relatively large cutting action is achieved. The left set tooth 62 of the second saw tooth small group 84, which is the succeeding tooth of the first saw tooth small group 14B, is the tip of the tooth and the tip of the left set tooth 22 of the first saw tooth small group 14B which is the preceding saw tooth of the same shape. A relatively large cutting action is achieved due to the long distance between the and.

Correspondingly, the gullet area of the right set teeth 24 (the hatched area) in the first small saw tooth group 14A is set larger than the gullet areas of the right set

teeth

26 and 28. The gullet area (the hatched portion) of the right set teeth 24 in the first sawtooth small group 14B is set to be larger than the gullet area of each right set tooth 26 (28). Further, the Galette area of the left set tooth 66 of the second sawtooth small group 82 that is the succeeding tooth of the first sawtooth small group 14A (the portion hatched with dots) is the first sawtooth small group that is the preceding tooth of the succeeding tooth. It is set to be larger than the gullet area of the right set teeth 28 of 14A. The gullet area of the left set tooth 62 of the second sawtooth small group 84, which is the succeeding tooth of the first sawtooth small group 14B (the point hatched portion), is the leading tooth of the succeeding tooth of the first sawtooth small group 14B. It is set larger than the gullet area of the right set teeth 28.

teeth

20 and 22. The gullet area of the left set teeth 18 in the first sawtooth small group 14B is set to be larger than the gullet areas of the left set

teeth

20 and 22.

Then, according to the fifth embodiment of the present disclosure, in addition to the same operation and effect as the third embodiment of the present disclosure, the following operation and effect are achieved.

As described above, the plurality of saw teeth in each saw tooth group 78 are configured by eight types of inter-tooth pitches P1, P2, P3, P4, P5, P6, P7 and P8. Therefore, according to the fifth embodiment of the present disclosure, similarly to the fourth embodiment of the present disclosure, cutting noise can be reduced and the working environment can be improved.

Also, as described above, the second sawtooth subgroup 82 is arranged between the two first sawtooth subgroups 14 (14A, 14B) in each sawtooth group 78. Therefore, it is possible to prevent the functional pitch of the

straight teeth

48, 58 from becoming long, improve the straightness of the band saw blade 76, and further improve the cutting efficiency of the band saw blade 76. The functional pitch regarding the

straight teeth

48 and 58 is the distance between the tooth tip of the straight tooth 58 of the second saw tooth small group 82 and the tooth tip of the straight tooth 48 of the second saw tooth small group 80, and the second saw tooth small group. The distance between the tooth tip of the straight tooth 58 of 84 and the tooth tip of the straight tooth 58 of the second sawtooth small group 82.

As described above, according to the first to fifth embodiments, when cutting a large work material having a long cutting length such as a large pipe material or H-section steel, the cutting amount of the band saw blade is used. Becomes smaller. Then, only the plurality of saw teeth in the second small saw tooth group, the leading tooth of the three or more left set teeth, and the leading tooth of the three or more right set teeth contribute to the cutting. Of the 3 or more left set teeth, the 2 or more left set teeth excluding the top tooth and the 3 or more right set teeth of the 2 or more right set teeth excluding the top tooth are unlikely to contribute to cutting. Become. In other words, the two or more left set teeth excluding the leading tooth and the two or more right set teeth excluding the leading tooth are substantially in a non-working state. However, by providing the continuous set teeth having the same width dimension and the same amount of protrusion, continuous tooth chipping is prevented and the band saw blade becomes strong against cutting accompanied by vibration.

Even when cutting a work material with a short cutting length where the band saw blade is easily accompanied by vibration, not only all the saw teeth in the second saw tooth small group but also all the saw teeth in the first saw tooth small group contribute to the cutting. Accordingly, even if the band saw blade vibrates, it is possible to suppress the phenomenon in which the bending of the entire band saw blade suddenly returns and stabilize the band saw blade.

It should be noted that the present disclosure is not limited to the description of the above-described embodiment, for example, a hard tip made of a hard material such as a cemented carbide is provided at the tip of each cutting tooth, and other various embodiments are performed. It is possible. The scope of rights included in the present disclosure is not limited to the above embodiment.

The disclosure of the present application relates to the subject matter described in Japanese Patent Application No. 2018-240501 filed on Dec. 25, 2018, the entire disclosures of which are incorporated herein by reference.

Claims

Sawtooth group consisting of a combination pattern of multiple sawtooths is repeatedly provided,
Each sawtooth group
A first sawtooth small group composed of three or more left set teeth which are continuous as a plurality of saw teeth and three or more right set teeth which are continuous,
A second saw tooth having a plurality of straight teeth and two or more right and left set teeth or two or more left and right set teeth, which are set to an inter-tooth pitch larger than the inter-tooth pitch of the first saw tooth small group. Consisting of a small group of sawtooth,
A band saw blade, wherein the set teeth of the first small saw tooth group and the set teeth of the second small saw tooth group have the same amount of extension.
Sawtooth group consisting of a combination pattern of multiple sawtooths is repeatedly provided,
Each sawtooth group
A first sawtooth small group composed of three or more left set teeth which are continuous as a plurality of saw teeth and three or more right set teeth which are continuous,
As a plurality of saw teeth, at least one straight tooth and at least one pair of left and right set teeth alternately arranged along the traveling direction of the saw blade, and a tooth gap larger than the inter-tooth pitch of the first saw tooth small group. Consisting of a second sawtooth subgroup set to pitch,
The first sawtooth subgroup and the second sawtooth subgroup have the same band width dimension,
A band saw blade, wherein the set teeth of the first small saw tooth group and the set teeth of the second small saw tooth group have the same amount of extension.
The first sawtooth subgroup includes a minimum tooth pitch of the sawtooth group,
The second sawtooth subgroup includes a maximum intertooth pitch of the sawtooth group,
The band saw blade according to claim 1 or 2, wherein the maximum inter-tooth pitch is twice or more the minimum inter-tooth pitch.
Sawtooth group consisting of a combination pattern of multiple sawtooths is repeatedly provided,
Each sawtooth group
A first sawtooth small group including three or more left set teeth continuous as a plurality of saw teeth and three or more continuous right set teeth following or preceding them and including a minimum inter-tooth pitch;
As a plurality of saw teeth, it is composed of straight teeth and left and right set teeth alternately arranged along the saw blade traveling direction, and is composed of a second saw tooth small group including a maximum tooth pitch,
The maximum interdental pitch is at least twice the minimum interdental pitch,
The band width of the left set tooth, the band size of the right set tooth, and the band width of the straight tooth are set to the same size. Band saw blade characterized by being set to the amount.
The gullet area of the top tooth of the three or more left set teeth is set to be larger than the gullet area of each left set tooth excluding the top tooth, and the gullet area of the top tooth of the three or more right set teeth is set. The gullet area is set to be larger than the gullet area of each right set tooth excluding its leading tooth, and the gullet area of the trailing tooth of the first sawtooth small group is set to be larger than the gullet area of the leading tooth of the trailing tooth. The band saw blade according to any one of claims 1 to 4, wherein the band saw blade is a blade saw blade.
The band saw blade according to any one of claims 1 to 5, wherein the number of the first sawtooth small groups forming each sawtooth group is plural.
The band saw blade according to claim 6, wherein the second sawtooth small group is arranged between the plurality of first sawtooth small groups in each sawtooth group.
The band saw blade according to any one of claims 1 to 7, wherein the leading tooth and the trailing tooth of the first small saw tooth group are left and right set teeth.
The band saw blade according to any one of claims 1 to 8, wherein the number of saw teeth forming each saw tooth group is 20 or more.