JP4610038B2 - Saw blade - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a saw blade such as a band saw, a circular saw, and a hax saw, and more particularly to a metal saw blade capable of cutting from deformed steel to a solid material.
[0002]
[Prior art]
Conventionally, a band saw machine has been used as an apparatus for cutting a large workpiece made of metal, for example. A general band saw blade 101 used in this band saw machine has a group of sawtooth patterns composed of a plurality of saw teeth bent to the left and right as shown in the conventional example A of FIGS. Straight tooth T _A 7 and set teeth T swung out to the left or right _A 1, T _A 2, ..., T _A 5, T _A 6 and this sawtooth pattern is repeated.
[0003]
Conventional saw blades generally have a pitch between teeth that is equal and a pitch that is unequal, and in terms of suppressing cutting vibration with an unequal pitch than with a regular pitch. Great effect.
[0004]
In the saw blade 101 of the conventional example A in FIGS. 8A and 8B, the case of unequal pitch is shown. This saw blade 101 has a straight tooth T _A 7 and clam teeth T _A P7, P2, P3,..., P7 in order from the pitch P1 to 1, and galette depths H1 to H7 corresponding to the pitches P1 to P7 are provided. In this example, among the pitches P1 to P7, P7 has the largest pitch, and the second largest is P1.
[0005]
In this case, each tooth T _A 1 to T _A 7 is a large clearance angle θ _A Has excellent cutting ability, but extremely high chipping frequency occurs.
[0006]
Generally, when cutting a workpiece with a band saw blade, when each tooth rushes into the workpiece, the amount of straight teeth that are swung in the left-right direction (thickness direction of the saw blade) is relatively small. In the case of the left and left set teeth, the tooth is greatly swung in the right direction, which is a major cause of vibration and noise in the thickness direction of the saw blade.
[0007]
Therefore, in the band saw blade, for example, in order to cope with chatter vibrations and noises, the pattern of the clams is set to various patterns such as a racer set, a wave set, or a straight set, and the pitch of each tooth is set as described above. The pitch is unequal.
[0008]
In addition, to cope with difficult-to-cut materials such as stainless steel, saw blades have been developed, such as changing the height difference of the saw blades in the saw blade and changing the amount of claws.
[0009]
In addition, various saw blades that meet market needs have been developed, such as those in which the angle of the tooth tips has been changed in various ways and optimally arranged, or those in which the longitudinal direction of the band saw blade is corrugated. .
[0010]
On the other hand, in terms of the material of the saw blade, it has developed from carbon tool steel and alloy tool steel, and bimetal saw blades using high-speed tool steel for the cutting edge and spring steel-type high toughness steel for the body are the mainstream. Recently, many saw blades using cemented carbide as the cutting edge have been used.
[0011]
[Problems to be solved by the invention]
Conventionally, the performance of saw blades has been improved and responded to the needs of the market by various methods as described above. However, the speed of cutting work, high accuracy, low noise, etc. There is no end to the market needs for higher saw blade performance. In addition, market needs have been subdivided according to business types, work materials, and the like, and the types of saw blades have been varied.
[0012]
This trend is expected to continue in the future, and it is necessary for the saw blade manufacturer to deal with even a small number of market needs. For example, we supply saw blades with tooth shapes suitable for cutting deformed steel to steel suppliers that handle deformed steel such as H-shaped steel, angles, channels, square / round pipes, etc. Provides a toothed saw blade suitable for cutting solid materials.
[0013]
The characteristics of cutting according to the type of cutting material can be broadly described. In the cutting of deformed steel, the unstable shape of the cutting material tends to cause chatter vibration, and the tooth tip of the saw blade is accompanied by chipping and toothing. There was a problem that chipping was likely to occur.
[0014]
In addition, since the cutting length is relatively large in the above-described cutting of the solid material, the galette of the saw blade is likely to be clogged, so if there is no sufficiently large galette, the cutting surface becomes rough due to clogging or bends. The problem was occurring.
[0015]
Some steel suppliers cut both the above-mentioned deformed steel and solid material. For such users, as shown in FIGS. 9A and 9B, there is a saw blade 103 (conventional example B) already disclosed in JP-A-8-17434. Focusing on the fact that this saw blade 103 has specific teeth that tend to cause chipping on the pitch structure, the tooth tip is made stronger by reducing the clearance angle only for this specific tooth. Although it was a saw blade for materials, there is a feature that chipping and tooth chipping are relatively reduced even when a deformed steel is cut without impairing the cutting performance of the solid material, and the life of the saw blade 103 is extended. ing.
[0016]
9A and 9B, the saw blade 103 of the conventional example B has an unequal pitch like the saw blade 101 of the conventional example A for the sake of easy understanding of the comparison with the saw blade 101 of the conventional example A. A case is shown in which a sawtooth pattern of a plurality of sawtooth is represented by a straight tooth T _B 7 and set teeth T swung out to the left or right _B 1, T _B 2, ..., T _B 5, T _B 6 straight teeth T _B 7 and this straight tooth T _B 7 followed by a pair of left and right set teeth T _B 1, T _B 2 clearance angle θ _B By reducing the size, the strength of the tooth tip is increased. In addition, clam tooth T _B 3-T _B 6 is the same clearance angle θ as in the conventional example A. _A It is said.
[0017]
In addition, the saw blade 103 of the conventional example B has a straight tooth T like the saw blade 101 of the conventional example A. _B 7 and clam teeth T _B P7, P2, P3,..., P7 in order from the pitch P1 to 1, and galette depths H1 to H7 corresponding to the pitches P1 to P7 are provided. In FIGS. 9A and 9B, P1 to P7 and H1 to H7 having the same reference numerals as those in FIGS. 8A and 8B have the same dimensions. Therefore, the pitch P7 is the largest and the second largest is P1.
[0018]
Some steel suppliers specialize in cutting deformed steel. For such users, as shown in FIGS. 10A and 10B, there is a saw blade 105 (conventional example C) already disclosed in JP-A-11-19821. As a result of studying the unique phenomenon in deformed steel, that is, the cause of the early saw blade life due to continuous tooth chipping, this saw blade 105 is overcut by the tooth following this one missing tooth when any one tooth is missing. It became clear that the cause was missing teeth one after another. Focusing on this cause, a protector 109 is provided on the flank 107 of the saw blade 105 to prevent overcutting.
[0019]
In the saw blade 105 of the conventional example C in FIGS. 10A and 10B, the saw blade 101 of the conventional example A and the saw blade 101 of the conventional example A are shown for convenience of comparison with the saw blades 101 and 103 of the conventional example A and the conventional example B. Similarly, the case of unequal pitches is shown, and a group of sawtooth patterns composed of a plurality of sawtooth is represented by a straight tooth T _C 7 and set teeth T swung out to the left or right _C 1, T _C 2, ..., T _C 5, T _C It is comprised from 6. Further, the saw blade 105 of the conventional example C is similar to the saw blades 101 and 103 of the conventional example A and the conventional example B, and the straight tooth T _C 7 and clam teeth T _C P7, P2, P3,..., P7 in order from the pitch P1 to 1, and galette depths H1 to H7 corresponding to the pitches P1 to P7 are provided. In FIGS. 10A and 10B, P1 to P7 and H1 to H7 having the same reference numerals as those in FIGS. 8A and 8B and FIGS. 9A and 9B have the same dimensions, and the pitch P7 is The largest and second largest is P1.
[0020]
Therefore, the saw blade 105 of the conventional example C is smaller in overall galette area than the saw blades 101 and 103 of the conventional example A and the conventional example B.
[0021]
As described above, the saw blade 103 of the conventional example B and the saw blade 105 of the conventional example C that meet the market needs have been developed. However, the market needs remain unknown and new needs have been born. .
[0022]
As mentioned above, there are many places where steel makers cut both deformed steel and solid steel. However, this is due to the demand for high-performance saw blades used when the cutting ratio of both is approximately half. is there.
[0023]
Further, in more detail, the saw blade 103 of the conventional example B is originally an improved version of the saw blade for solid material, and particularly when a small amount of deformed steel is cut by cutting the solid material. Demonstrate power. On the other hand, the saw blade 105 of the conventional example C is suitable for cutting a small amount of solid material by cutting most of the deformed steel.
[0024]
However, when cutting the deformed steel with the saw blade 103 of the conventional example B, there is no particular problem even if the deformed steel is mostly formed if the cutting speed is the same as the conventional one, but it is performed with the saw blade 105 of the conventional example C. When such high speed cutting is performed, there is a problem that continuous chipping is likely to occur.
[0025]
On the other hand, when cutting the solid material with the saw blade 105 of the conventional example C, since the protector 109 provided on the flank face of the tooth tip occupies the galette area, clogging is caused because the entire galette area is small. Since it is easy to occur, the problem that cutting speed cannot be raised appears.
[0026]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a saw blade particularly suitable for a user who is cutting both a deformed steel and a solid material at an approximately half ratio. There is provided a saw blade capable of exhibiting cutting performance that combines a saw blade suitable for a solid material as in the conventional example B described above and a saw blade suitable for a deformed steel as in the conventional example C.
[0027]
[Means for Solving the Problems]
The present invention has been made in view of the above-described problems, and includes a straight tooth and a pair of left and right set teeth following the straight tooth as primary cutting teeth, and two set teeth following the primary cutting tooth are provided. A saw blade provided as a secondary cutting tooth and capable of cutting both deformed steel and solid material, wherein the clearance angles of the left and right set teeth in the primary cutting tooth are set to the set teeth in the straight tooth and the secondary cutting tooth. The clearance between the straight teeth and the set teeth following the straight teeth is the largest, and the pitch between the straight teeth and the set teeth preceding the straight teeth is 2 In preparation for the second largest pitch, when a chipping occurs at the tip of the straight tooth on the flank of the straight tooth, the chipping is continuously generated by contacting the bottom of the cutting groove of the cutting material. Has a missing tooth protector to prevent It is characterized by this.
[0028]
Therefore, by providing a protrusion that restricts the cutting amount to the straight tooth that plays an important role in straightness, the cutting amount of the subsequent tooth is limited even if the tooth tip of the straight tooth is missing, The entire continuous chipping is prevented. Also, in the case of a bimetal saw blade, the strength of the welded portion is increased because the length of the bimetallic welded portion is longer than when there is no projection, so the straight tooth bimetal welded portion when cutting the deformed steel The tooth chipping is prevented.
[0029]
In addition, since the first clearance angle of the primary cutting tooth is different from the second clearance angle of the secondary cutting tooth, the smaller the clearance angle, the greater the strength of the tip. It contributes to prolonging the service life, and the one with a larger clearance angle contributes to increasing the biting ability and cutting ability of the tooth tip with respect to the cutting material.
[0033]
Further, in the saw blade, the saw blade is a bimetal saw blade using high-speed tool steel or cemented carbide as a cutting edge and using high toughness steel as a body portion, and the tooth chip protector is a bimetal welded portion. Between the tooth and the tip of the straight tooth It is characterized by this.
[0034]
Therefore ,bimetal Since the length of the welded portion is increased, the strength of the welded portion is increased, thereby preventing tooth chipping from the straight bimetallic welded portion when cutting the deformed steel.
[0035]
In the saw blade, the clearance angles of the pair of left and right set teeth in the primary cutting teeth are equal. It is characterized by this.
[0045]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0046]
Referring to FIGS. 1A and 1B, a saw blade 1 according to a first embodiment of the present invention is shown. This saw blade 1 is shown in the case of an unequal pitch as in the conventional example B and the conventional example C for the sake of easy understanding of the comparison between the saw blade 103 of the conventional example B and the saw blade 105 of the conventional example C. Has been.
[0047]
The saw blade 1 has a group of sawtooth patterns composed of a plurality of sawtooth teeth, _O 7 (tertiary cutting teeth) and set teeth T swung out to the left or right _O 1, T _O 2, ..., T _O 5, T _O 6 (T _O 1, T _O 2 ,: Primary cutting tooth, T _O 3 ~ T _O 6: secondary cutting teeth), and this sawtooth pattern is repeated. Straight tooth T _O 7 and subsequent set teeth T _O The pitch between the teeth is P7 and the set teeth T _O 1 and T _O The pitch between the teeth is P2, and the set teeth T _O 2 followed by T _O 3, ..., T _O The pitches up to 6 are P3, P4,..., P6 in order, and galette depths H1 to H7 corresponding to the pitches P1 to P7 are provided.
[0048]
Note that P1 to P7 and H1 to H7 in FIGS. 1 (A) and 1 (B) are shown in FIGS. 9 (A) and 9B for the sake of convenience in understanding the comparison with the saw blades 103 and 105 of the conventional example B and the conventional example C. (B) and FIGS. 10 (A) and 10 (B) have the same dimensions as P1 to P7 and H1 to H7, respectively. The pitch P7 is the largest and the second largest is P1.
[0049]
The saw blade 1 according to the first embodiment of the present invention has a straight tooth T that plays an important role in straightness. _O The tooth missing protector 3 is provided only on the flank 7 and the straight tooth T _O 7 and subsequent set teeth T _O Since the pitch between 1 and P7 is straight tooth T _O The protector 3 of 7 is provided in the galette of the pitch P7 which has the largest pitch, ie, the largest galette area. Thereby, the whole galette area required for the cutting of a solid material is ensured so that a galette may not clog.
[0050]
Therefore, straight teeth T play an important role in straightness _O 7 is provided with a protector 3, which is a protrusion that limits the cutting amount, so that even if the tooth tip of a straight tooth is missing, the cutting amount of the subsequent tooth is limited, preventing the entire continuous tooth missing. Is done. Straight tooth T _O When the protector 3 is provided at 7 and there is a bimetal weld, the length L of the bimetal weld when the protector 3 is not provided as shown by the dotted line in FIG. _O Compared to the length L of the bimetallic weld when the protector 3 is present ₁ Since the strength of the welded portion increases because the length of the steel is longer, the straight tooth T when cutting the deformed steel _O 7 is prevented from missing teeth from the bimetallic weld.
[0051]
Referring to FIGS. 2A and 2B, the protector 3 will be described in more detail. The height of the protector 3 is higher than that of the tooth tip 5 at the flank 7 of the tooth tip 5 or at an appropriate position such as behind the flank 7. A protrusion 9 is provided which forms a contact portion as the missing tooth protector 3 lowered by t. The clearance angle θ of the tooth tip 5 ₁ Is preferably in the range of 15 to 45 degrees, particularly preferably 20 to 35 degrees. In FIG. 2, θ ₁ And θ ₃ Are drawn at the same angle, but θ ₂ May be the same angle as or θ ₂ , Θ ₃ Other angles may be used.
[0052]
The protrusion 9 does not contact the bottom of the cutting groove in the cutting portion of the cutting material during normal cutting. Since it comes into contact with the bottom of the cutting groove of the cutting portion of the material, the return of deflection due to the back component force in the cutting resistance of the saw blade 1 is limited to the height t. As a result, the set teeth T which are the subsequent teeth in the cutting direction orthogonal to the traveling direction of the saw blade 1 _O The cutting depth of 1 is limited. Therefore, the set tooth T which is the subsequent tooth _O Since the amount of cutting of 1 is prevented from suddenly increasing, a sharp increase in cutting resistance is suppressed, and tooth chipping is prevented from occurring continuously.
[0053]
The saw blade 1 is a straight tooth T _O 7 and the pair of left and right set teeth T constituting the subsequent primary cutting tooth 11 _O 1 and T _O 2 clearance angle θ ₂ The tooth tip 13 is increased in strength. Thereby, the whole chipping of the saw blade 1 is suppressed.
[0054]
More specifically, as shown in FIG. 2B, the tooth angle a, the rake angle h, and the clearance angle θ. ₂ Is 90 degrees, so unless the rake angle h changes significantly, the clearance angle θ ₂ The tooth angle “a” increases as the angle becomes smaller. Therefore, the clearance angle θ ₂ The smaller the is, the greater the strength of the tooth tip 13 and the longer the life of the tooth. However, the biting ability and cutting ability of the tooth tip 13 with respect to the cutting material are reduced. Conversely, the clearance angle θ ₂ However, since the strength of the tooth tip 13 decreases, the chipping frequency increases and the tooth life is shortened.
[0055]
Referring to FIG. 1 (B) and FIG. 2 (B) together, a pair of left and right set teeth T of the primary cutting tooth 11 described above. _O 1 and T _O 2 and 2 pairs of left and right set teeth T constituting the subsequent secondary cutting tooth 15 _O 3-T _O 6 is the clearance angle θ ₃ Is the clearance angle θ of the primary cutting tooth ₂ It is configured to be larger, and the biting ability and cutting ability of the tooth tip 17 are increased. However, since the strength of the primary cutting teeth 11 is increased, the ripple effect of the suppression force of chipping reaches the subsequent secondary cutting teeth 15 as well.
[0056]
Straight tooth T _O The galette of No. 7 is P1 having the second largest pitch. As a result, straight tooth T plays an important role in cutting and bending. _O A sufficient galette area of 7 is ensured.
[0057]
In the saw blade 1 of the first embodiment, the set-tooth sawtooth pattern is T _O 1 to T _O This sawtooth pattern is repeated in one set of seven teeth of seven, but this can be implemented from the case where the sawtooth pattern of this set is at least one set of five teeth. Because straight tooth T _O 7 is 1 tooth, left and right set teeth T _O 1 and T _O 2 with 2 teeth, clearance angle θ ₃ Left and right set teeth T with large tooth tips 17 _O 3 and T _O This is because 2 teeth, 4 in total, and a total of 5 teeth form the basic sawtooth pattern for clams.
[0058]
These five teeth serve as a basic saw blade pattern, and a saw tooth pattern composed of various multiple teeth can be configured.
[0059]
Incidentally, even if there are a plurality of types of teeth having different clearance angles, rake angles, tooth angles, etc. in one saw blade, the same type of teeth must be the same in the left and right set teeth. If the number is not the same, the balance between the left and right sides of the entire saw blade will be lost, causing cutting.
[0060]
3A and 3B, a saw blade 19 according to a second embodiment of the present invention is shown. The saw blade 19 has two types of A group and B group having a plurality of saw teeth as a basic one group of saw tooth patterns.
[0061]
That is, the A group has one straight tooth TK8 and an odd number (three in this case) of set teeth TK1, TK2, and TK3, and all the pitches PK1 to PK4 are different.
[0062]
The set teeth TK1 and TK3 are bent leftward in the longitudinal direction of the body portion of the saw blade 19, that is, the traveling direction of the saw blade 19 (right direction in FIG. 3), and the set teeth TK2 are bent rightward. Yes.
[0063]
Further, in the group A, the protector 3A is provided only on the flank of the straight tooth TK8 that plays an important role in straightness. Since the pitch PK1 between the straight tooth TK8 and the following set teeth TK1 is the largest pitch among the pitches PK1 to PK4, the protector 3A of the straight tooth TK8 has the largest pitch, that is, the pitch PK1 having the largest galette area. It is provided in the galette. Thereby, the whole galette area required for the cutting of a solid material is ensured so that a galette may not clog.
[0064]
The protector 3A has substantially the same configuration as the protector 3 of the saw blade 1 according to the first embodiment described above, and a description thereof will be omitted.
[0065]
Therefore, the protector 3A, which is a protrusion that restricts the cutting amount, is provided in the straight tooth TK8, which plays an important role in straightness, so that even if the tooth tip of the straight tooth TK8 is missing, the following The amount of tooth cut is limited, and the entire continuous chipping is prevented. Further, as in the case of the protector 3 in FIG. 2B, the strength of the welded portion is increased because the length of the bimetallic welded portion is longer than when the protector 3A is not provided. Tooth chipping from the bimetal weld of the straight tooth TK8 is prevented.
[0066]
In the A group, the clearance angle between the pair of left and right set teeth TK1 and TK2 constituting the primary cutting tooth 21 subsequent to the straight tooth TK8 is reduced to increase the strength of the tooth tip. Thereby, the entire chipping of the saw blade 19 is suppressed.
[0067]
The set teeth TK3 that constitute the secondary cutting teeth 23 following the pair of left and right set teeth TK1 and TK2 of the primary cutting teeth 21 are bent leftward toward the traveling direction of the saw blade 19, and escaped. The angle is configured to be larger than the clearance angle of the primary cutting teeth, and the biting ability and cutting ability are increased. However, since the strength of the primary cutting teeth 21 is increased, the ripple effect of the chipping suppression force is exerted on the subsequent secondary cutting teeth 23 as well.
[0068]
The group B has exactly the same pitch configuration as the group A, the same number of straight teeth, and the same number of set teeth where the corresponding set-up direction of the set-up teeth is opposite to the set-up direction of the set-up teeth of the group A. In the second embodiment, there are one straight tooth TK4 and an odd number (three in this case) of set teeth TK5, TK6, TK7, and the swing-out direction is set to the group A set teeth TK1, TK2, TK3. It is the opposite direction of
[0069]
In addition, the rake angle, tooth angle, clearance angle, and protector 3A of each tooth corresponding to each other in the A group and the B group have the same configuration, and the amount of clashes of the left and right set teeth of both groups and all the teeth The tooth height is almost constant.
[0070]
The saw blade 19 is provided with one group of sawtooth patterns consisting of the A group and the B group alternately and repeatedly.
[0071]
With the above configuration, the saw blade 19 has the B group of the set teeth that are bent in the direction opposite to the bending direction of the set teeth of the A group with the same pitch configuration, so that the saw blade of the B group is generated in the A group. By generating a vibration having the same magnitude as that of the vibration in the thickness direction of the saw blade, the vibration in the thickness direction of the A group and the vibration in the thickness direction of the B group are offset to reduce cutting noise.
[0072]
In the saw blade 19 of the second embodiment, the set sawtooth pattern is a set of eight teeth TK1 to TK8, and this sawtooth pattern is repeated. It can be implemented from a set of 6 teeth. The reason is that the straight tooth TK8 of group A is one tooth, the set-up tooth (for example, TK2) whose tooth tip is strengthened is one tooth, the set-up tooth TK3 having a tooth tip with a large clearance angle is one tooth, and the set-up is This is because the B group in the reverse direction has a total of 6 teeth, for example, a total of 3 teeth of TK4, TK6, and TK7.
[0073]
The above six teeth serve as a basic saw blade pattern, and a saw tooth pattern composed of various various teeth can be configured.
[0074]
Referring to FIG. 4, a pair of set teeth T constituting the primary cutting teeth 11 in the saw blade 1 of the first embodiment described above. _O 1 and T _O 2 and the pair of set teeth TK1 and TK2 constituting the primary cutting teeth 21 of the A group in the saw blade 19 of the second embodiment, and the pair of set teeth TK5 and TK6 constituting the primary cutting teeth 21 of the B group: As shown in FIG. 4, the flank surface of the tooth tip shape may be changed from a straight portion 25 from the tooth tip to a smooth surface by a curved portion 27 (R shape).
[0075]
Referring to FIG. 5, a pair of set teeth T constituting the primary cutting teeth 11 in the saw blade 1 of the first embodiment described above. _O 1 and T _O 2 and the pair of set teeth TK1 and TK2 constituting the primary cutting teeth 21 of the A group in the saw blade 19 of the second embodiment, and the pair of set teeth TK5 and TK6 constituting the primary cutting teeth 21 of the B group: The tooth tip-shaped flank may be configured by a curved portion 27 having an R shape from the tooth tip, as shown in FIG.
[0076]
Referring to FIG. 6, the saw blade 103 of the conventional example B, the saw blade 105 of the conventional example C, the saw blade 1 of the first embodiment of the present invention, and the saw of the second embodiment. The lifetime of each saw blade when a solid material of the same material and shape is cut using the blade 19 is compared. In this case, the life of the saw blade 103 of Conventional Example B is compared as 100%.
[0077]
As shown in FIG. 6, in the case of solid cutting, both the saw blades 1 and 19 of the first and second embodiments of the present invention are the same as the saw blade 103 of the conventional example B and the conventional example C. The life of the saw blade 105 is almost intermediate.
[0078]
Referring to FIG. 7, the saw blade 103 according to the conventional example B, the saw blade 105 according to the conventional example C, the saw blade 1 according to the first embodiment of the present invention, and the saw according to the second embodiment. The lifetime of each saw blade is compared when cutting the deformed steel of the same material and shape using the blade 19. In this case, the life of the saw blade 105 of the conventional example C is compared as 100%.
[0079]
As shown in FIG. 7, the saw blades 1 and 19 of the first and second embodiments of the present invention are both the saw blade 103 of the conventional example B and the conventional example C even in the case of cutting the deformed steel. The life of the saw blade 105 is almost intermediate.
[0080]
In the case of cutting of deformed steel, the reason why the saw blade 19 of the second embodiment has a better saw blade life than the saw blade 1 of the first embodiment is that the saw blade with the strength of the tooth tip increased. This is because the ratio is different. That is, in the first embodiment, there are 2 teeth in 7 teeth, whereas in the second embodiment, there are 4 teeth in 8 teeth and the ratio is high.
[0081]
As described above, the saw blade 1 and the saw blade 19 of the present invention exhibit substantially intermediate performance between the saw blade 103 of the conventional example B suitable for the solid material and the saw blade 105 of the conventional example C suitable for the deformed steel. Since it is a saw blade, it is economical for a user who cuts both the deformed steel and the solid material at a ratio of approximately half because the consumption of the saw blade can be reduced.
[0082]
The saw blade 1 of the first embodiment is particularly effective when there are a few solid materials among users who cut both the deformed steel and the solid material at a ratio of approximately half.
[0083]
Further, the saw blade 19 of the second embodiment is particularly effective when there are a lot of deformed steels among users who are cutting both deformed steel and solid material at a ratio of approximately half.
[0084]
In addition, this invention is not limited to embodiment mentioned above, It can implement in another aspect by making an appropriate change. That is, in the present embodiment, the case of a band saw blade has been described, but it can also be applied to various saw blades such as a circular saw blade and a hax saw. A tooth having a protrusion, a tooth having a different clearance angle, a tooth having a different tooth height, and the like can be appropriately combined as necessary. Further, although an example of unequal pitch has been described, it may be equal pitch.
[0085]
【The invention's effect】
As can be understood from the description of the embodiments of the invention as described above, The present invention According to the above, by providing protrusions that limit the cutting amount on straight teeth that play an important role in straightness, the cutting amount of subsequent teeth is limited even if the tip of a straight tooth is missing And continuous continuous chipping is prevented. Also ,bimetal Since the length of the welded portion is increased, the strength of the welded portion is increased, thereby preventing tooth chipping from the straight bimetallic welded portion when cutting the deformed steel.
[Brief description of the drawings]
FIGS. 1A and 1B show a saw blade according to a first embodiment of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a front view.
2A and 2B show details of the saw blade according to the first embodiment of the present invention, in which FIG. 2A is a plan view and FIG. 2B is a front view.
3A and 3B show a saw blade according to a second embodiment of the present invention, in which FIG. 3A is a plan view and FIG. 3B is a front view.
4 is a partial front view showing another embodiment of the primary cutting tooth in FIGS. 1 and 2. FIG.
5 is a partial front view showing another embodiment of the primary cutting tooth in FIGS. 1 and 2. FIG.
FIG. 6 is a saw blade life comparison diagram when cutting a solid material with each saw blade.
FIG. 7 is a life comparison diagram of saw blades when cutting deformed steel with each saw blade.
FIGS. 8A and 8B show a saw blade of a conventional example A, where FIG. 8A is a plan view and FIG. 8B is a front view.
9A and 9B show a saw blade of a conventional example B, where FIG. 9A is a plan view and FIG. 9B is a front view.
10A and 10B show a saw blade of a conventional example C, where FIG. 10A is a plan view and FIG. 10B is a front view.
[Explanation of symbols]
1 Saw blade (of the first embodiment)
3,3A protector
5 tooth tips
7 flank
9 Protrusion
11 Primary cutting teeth (of the first embodiment)
13, 17 tooth tip
15 Secondary cutting teeth (of the first embodiment)
19 Saw blade (of the second embodiment)
21 Primary cutting tooth (of the second embodiment)
23 Secondary cutting teeth (of the second embodiment)
25 Straight section
27 Curved section
T _O 7 Straight teeth (tertiary cutting teeth)
T _O 1 to T _O 6 Claw teeth
TK4, TK8 straight teeth
TK1-TK3, TK5-TK7 clam teeth
PK1-PK7 pitch
HK1-HK4 galette depth
θ ₁ ~ Θ ₃ Clearance angle

Claims (3)

A straight tooth and a pair of left and right set teeth following the straight tooth are provided as primary cutting teeth, and a set tooth following the primary cutting teeth is provided as a secondary cutting tooth for cutting both deformed steel and solid material. A corresponding saw blade, wherein the clearance angle of the left and right set teeth in the primary cutting teeth is smaller than the clearance angle of the set teeth in the straight teeth and the secondary cutting teeth, and the straight teeth and the direct teeth The pitch between the subsequent set teeth is the largest, and the pitch between the set teeth and the set teeth preceding the set teeth is the second largest pitch. It is provided with a chipped protector for preventing a chipped portion from coming into contact with the bottom of a cutting groove of a cutting material when a chipped portion is generated at the tip of a straight tooth. Saw blade. The saw blade according to claim 1, wherein the saw blade is a bimetal saw blade using a high-speed tool steel or a cemented carbide for a cutting edge and using a high toughness steel for a body portion, A saw blade formed between a bimetal weld and a straight tooth tip . The saw blade according to claim 2, wherein the clearance angles of the pair of left and right set teeth in the primary cutting teeth are equal .

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