JP2011183462A - Band saw blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a band saw blade capable of achieving improvement of fatigue life and improvement of accuracy of a cutting surface. <P>SOLUTION: The band saw blade includes a plurality of saw teeth, includes a plurality of kinds of addendum pitches between respective saw teeth 3A-3G, includes a plurality of kinds of depths of gullets 5A-5G between the respective saw teeth, and includes a flat surface part 7A parallel to the longitudinal direction of the band saw blade at the bottom of the gullet 5A having the deepest gullet depth at the gullets 5A-5G. The depth of the gullets 5A-5G between the respective saw teeth corresponds to the size of the addendum pitches between the respective saw teeth. The band saw blade includes a plurality of addendum pitch groups having different addendum pitches between the respective saw teeth. The gullet depth of the addendum pitch group having a large addendum pitch is formed deeper than that of the addendum pitch group having a small addendum pitch. Respective gullet depths in the same addendum pitch group has the same depth. The band saw blade includes flat surface parts parallel to the longitudinal direction of the band saw blade at the bottoms of all gullets, and the number of the kinds of the gullet depths is smaller than that of the kinds of the addendum pitches. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a band saw blade, and more specifically, a flat portion parallel to the longitudinal direction (traveling direction) of the band saw blade is provided at the bottom of the galette of the band saw blade, thereby improving the fatigue life of the band saw blade. In addition, the present invention relates to a band saw blade that can improve cutting efficiency and can improve cutting surface accuracy.

  Conventionally, a band saw machine has been used as an apparatus for cutting a large workpiece made of metal, for example. The band saw blade used in this band saw machine is often a so-called bimetal band saw blade that uses high-speed tool steel or cemented carbide at the tooth tip and tough alloy steel at the body. Yes. The band saw blade includes a repellent clam band saw blade whose tooth tip is appropriately shaped, and a clad band saw blade basically provided with straight teeth and left and right set teeth. In terms of shape, multiple tooth pitches are provided to reduce cutting noise, and multiple variable pitch saw blades and set widths are used to reduce tooth height (distance from the reference position to the tooth tip). In recent years, a kerf-dispersed tooth-shaped saw blade, etc., which has a larger set width and is designed to subdivide chips and reduce cutting resistance, has been put to practical use.

  The band saw blade is used by being wound around the two wheels of the band saw machine. In the band saw machine used for sizing cutting of steel materials, a structure that can cut long workpieces by twisting the band saw blade with a saw blade guide. It has become.

  That is, the band saw blade operates under the tensile stress caused by the two wheels, the bending stress caused by the wheel, the twisting stress caused by the saw blade guide, and the stress that curves between the two saw blade guides when cutting into the workpiece.

  Since these four stresses are always received, it is not uncommon for the body portion of the band saw blade to undergo fatigue failure, leading to breakage and life.

  Note that there are Patent Documents 1 and 2 as prior art documents considered to be related to the present invention.

JP-A-6-718 JP-A-11-19822

  The configuration of the band saw blade 1 (see FIG. 2 of Patent Document 1) shown as a typical conventional example in Patent Document 1 is the structure shown in FIG. That is, the band saw blade 1 includes seven teeth of a plurality of saw teeth 3A to 3G as a tooth tip pitch group on one side of the body portion 2, and includes galettes 5A to 5G between the respective saw teeth 3A to 3G. .

  In the band saw blade 1, the tooth tip pitch (unit: mm) is composed of seven types of 8.03, 8.73, 9.58, 10.43, 11.19, 11.83, 12.88 in ascending order. Has been.

  The galette depth (unit: mm) is 3.8, 4.26, 4.55, 5.06, 5.36, 5.82, 6.13 in the order of the above-mentioned tooth tip pitch. It can be seen that the teeth having a smaller tip pitch have a smaller galette depth, and the teeth having a larger tip pitch have a larger galette depth. Furthermore, it can be seen that the ridge line of the tooth bottom is formed by one arc having different diameters.

  In such a conventional band saw blade, the four stresses tend to concentrate on the tooth bottom of the tooth having the largest galette depth, and furthermore, since the tooth bottom is formed by an arc, approximately 1 of the deepest part of the galette is obtained. There is a problem that stress is easily concentrated at a point, and fatigue failure is caused at an early stage from the point, and is easily broken.

  Further, a tooth profile having a large galette depth corresponding to the tooth tip pitch and having a circular arc at the bottom of the tooth has a problem that the tool for cutting the band saw blade becomes complicated and the cost is increased.

  It should be noted that the galette depth refers to the tooth with the highest tooth height, that is, the tooth tip of the tooth with the widest band width, and a reference line parallel to the traveling direction (longitudinal direction) of the band saw blade is drawn from the reference line to the root of the tooth The dimension (distance) to the deepest part. In the configuration of FIG. 9, since the tooth height dimension of all the saw teeth is constant, the dimension described is the dimension of the galette depth as it is.

  Patent Document 2 describes a band saw blade having a structure in which the depth of the galette is constant and the flat portions 7A to 7G are parallel (parallel) to the longitudinal direction (traveling direction) of the band saw blade 1 at the bottom of all galettes. Has been. When the pitch dimension of the tooth tip pitch described in Patent Document 1 is applied to the band saw blade described in Patent Document 2 and the galette depth is fixed to 3 mm, the configuration shown in FIG. 10 is obtained. For comparison with the bottom of the galette in the band saw blade 1 shown in FIG. 9, the bottom of the galette of the band saw blade shown in FIG. 9 is indicated by a broken line.

  As described above, by providing a flat portion parallel to the longitudinal direction of the band saw blade at the bottom of the galette and making the galette depth constant, there is an advantage that stress concentration can be relaxed and fatigue life can be improved. In addition, since the galette depth is constant and the flat portion is at the bottom of the galette, there is an advantage that the tool for cutting the band saw blade becomes simple and the manufacture is easy.

  However, when the galette depth of each saw tooth is made constant, a tooth with a small tooth tip pitch (8.03 mm in FIG. 10) must be used as a reference, and a tooth with a large tooth tip pitch (such as 12.88 mm in FIG. 10). ), And the cutting speed becomes a tooth reference with a small tooth tip pitch, and there is a new problem that cutting efficiency does not increase.

Here, referring to the dimensions shown in FIG. 2 of Patent Document 1, in FIG. 9 and FIG. 10, when comparing the galette area with a pitch of 12.88 mm, the case of FIG. 9 is 50.94 mm ² , In this case, it is 32.41 mm ² , and conceptually FIG. 9: FIG. 10 = 50.94 mm ² : 32.41 mm ² = 100%: 64%, and FIG. 10 may be 36% smaller than FIG. Recognize.

Further, when comparing the total galette area of the tooth tip pitch group of the band saw blade shown in FIG. 9 and the band saw blade shown in FIG.
FIG. 9: FIG. 10 = 239.33 mm ² : 174.40 mm ² = 100%: 73%
It can be seen that FIG. 10 is 27% smaller than FIG.

That is, in the conventional band saw blade,
(1) When the bottom of the galette is formed by an arc, there is a problem that stress is likely to concentrate at almost one point in the deepest part of the galette.
(2) Also, if the galette depth is constant and a flat surface is provided at the bottom of the galette, stress concentration on the bottom of the galette is alleviated and fatigue life is improved. Teeth with a small tip pitch must be used as a reference, the galette area of a tooth with a large tip pitch becomes small, the cutting speed becomes a tooth reference with a small tip pitch, and there is a problem that cutting efficiency does not increase.
(3) Also, there are many galette depths corresponding to the tooth tip pitch, and if the bottom of the gallet is arcuate, the tool for cutting the band saw blade becomes complicated and the cost increases. There is also.

  By the way, in the band saw blade, there are a repellent clam band saw blade having a tooth tip shape formed into an appropriate repellent shape, and a claws out band saw blade provided with straight teeth and left and right clam teeth. It is necessary to bend the left and right set teeth in the left and right direction when viewed in the traveling direction (longitudinal direction) of the band saw blade.

  Here, as described in FIG. 1 of Patent Document 2, the pitch dimension described in FIG. 2 of Patent Document 1 is applied to a band saw blade having a constant galette depth and a constant bend length. When the depth of the galette is 3 mm, the bending position of the clam is made to coincide with the bottom of the galette and the bending length of the clam is 5.72 mm, a band saw blade configured as shown in FIG. 11 is obtained.

  As described above, the fatigue life of the body portion is improved by providing a flat portion parallel to the longitudinal direction (running direction) of the band saw blade at the bottom of the galette and having a constant galette depth. However, in order to make the galette depth constant, a saw tooth with a small tooth tip pitch (saw tooth T2 having a tooth tip pitch of 8.03 mm in FIG. 11) must be used as a reference. The area of the galette becomes small, the cutting speed becomes a reference value with a small tip pitch, and there is a problem in improving cutting efficiency.

  Therefore, as shown in FIG. 12, the group is divided into a group of saw blades (T1, T2, T3) having a small tooth tip pitch and a group of saw blades (T4, T5, T6, T7) having a large tooth tip pitch, It is conceivable that the galette depth of the saw tooth of the small tooth tip pitch group is shallow, and that the galette depth of the saw tooth of the large tooth tip pitch group is deep.

  In this case, the clam bending position of the saw teeth T2 and T3 having a small tooth tip pitch does not change due to the constant set bending position, but the saw teeth T5, T6 and T7 having a large tooth tip pitch are obtained by deepening the galette. The clam bending length is as small as 3.92 mm. However, the clam bend length of the saw tooth T4 having a large tooth tip pitch adjacent to the saw tooth T3 having a small tooth tip pitch is 4.53 mm because the flank remains as it is, and all other saw teeth and claws are arranged. The bending length will be different. Therefore, when bending is performed to perform the settling, the amount of springback is different from that of other saw teeth, and there is a problem in improving the accuracy of the cut surface of the workpiece.

  The present invention has been made in view of the conventional problems as described above, and is a band saw blade having a plurality of saw teeth, and has a plurality of tooth tip pitches between the saw teeth and a galette provided between the saw teeth. A depth of a plurality of types is provided, and a flat portion parallel to the longitudinal direction of the band saw blade is provided at the bottom of the galette having the deepest galette depth.

  Further, in the band saw blade, the depth of the galette between the saw teeth corresponds to the size of the tooth tip pitch between the saw teeth.

  Further, the band saw blade includes a plurality of tooth tip pitch groups having different tooth tip pitches between the respective saw teeth, and the gallet depth of the tooth tip pitch group having a large tooth tip pitch is set to that of the tooth tip pitch group having a small tooth tip pitch. It is characterized by being formed deeper than the galette depth.

  In the band saw blade, each galette depth in the same tooth tip pitch group is the same depth.

  In the band saw blade, a flat portion parallel to the longitudinal direction of the band saw blade is provided at the bottom of all the galettes.

  In the band saw blade, the number of types of galette depth is less than the type of tooth tip pitch.

  Further, in the band saw blade, the set bending lengths of the left and right set teeth having the same galette depth on the scooping surface side are equal.

  In the band saw blade, the number of right and left set teeth having the same set bending length in the tooth tip pitch group is the same.

  Further, in the band saw blade, a galette depth group continuously provided with a plurality of saw teeth having a deep galette depth in a tooth tip pitch group, and a galette shallow group continuously provided with a plurality of saw teeth having a shallow galette depth. And a straight tooth is provided between the deep galette group and the shallow galette group.

  The band saw blade is characterized in that the left and right set teeth of the set teeth are equal in the galette depth group, and the set length of the set teeth of the left and right set teeth in the galette shallow group are equal. .

  In the band saw blade, the arrangement patterns of the left and right set teeth in the tooth tip pitch groups provided adjacent to each other are opposite to each other.

  Further, a band saw blade having a plurality of saw teeth, comprising a flat portion parallel to the longitudinal direction of the band saw blade at the bottom of all the galettes between the saw teeth, and continuously connecting a plurality of saw teeth having a deep galette depth. A straight tooth between the galette depth group provided and a galette shallow group continuously provided with a plurality of saw teeth having a shallow galette depth, and the same number of left and right clam teeth in the galette depth group; and The number of left and right set teeth in the shallow galette group is the same.

  Further, a band saw blade having a plurality of saw teeth, comprising a flat portion parallel to the longitudinal direction of the band saw blade at the bottom of all the galettes between the saw teeth, and continuously connecting a plurality of saw teeth having a deep galette depth. A first tooth tip pitch group includes a configuration in which straight teeth are provided between a provided galette depth group and a galette shallow group continuously provided with a plurality of saw teeth having a shallow galette depth. A second tooth tip pitch group having the same number of teeth as the number of teeth of the tip pitch group and the arrangement pattern of the left and right set teeth is reversed, and one set pattern pattern group with the first and second tooth tip pitch groups. It is characterized by comprising.

  According to the present invention, since the bottom part of the galette having the deepest galette depth, which is a part that easily breaks due to fatigue life, is provided with a plane part parallel to the longitudinal direction of the band saw blade, It is possible to avoid stress concentration at one point and to improve the fatigue life. And since the galette depth is a depth corresponding to the size of the tooth tip pitch between the respective saw teeth, the cutting efficiency can be improved.

  Further, according to the present invention, a galette depth group including a plurality of saw teeth having a deep galette depth continuously, which includes a flat portion parallel to the longitudinal direction of the band saw blade at the bottom of all galettes, and The structure having straight teeth between the galette shallow group continuously provided with a plurality of saw teeth having a shallow galette depth allows the number of right and left clam teeth in the galette depth group to be the same. At the same time, the number of claws on the left and right sides of the Galette Shallow Group can be made the same, and the fatigue life of the band saw blade is improved, the cutting efficiency is improved, the vibration of the band saw blade is reduced in the left-right direction, and the cutting surface accuracy is improved. It is something that can be done.

It is explanatory drawing which showed notionally and schematically the structure of the band saw blade which concerns on the 1st Embodiment of this invention. It is explanatory drawing which showed notionally and schematically the structure of the band saw blade which concerns on the 2nd Embodiment of this invention. It is explanatory drawing which showed notionally and schematically the structure of the band saw blade which concerns on the 3rd Embodiment of this invention. It is explanatory drawing which showed notionally and schematically the structure of the band saw blade which concerns on the 4th Embodiment of this invention. It is a fatigue life experiment result and a saw blade performance comprehensive evaluation table. It is explanatory drawing which showed notionally and schematically the structure of the band saw blade which concerns on the 5th Embodiment of this invention. It is explanatory drawing which showed notionally and schematically the structure of the band saw blade which concerns on the 6th Embodiment of this invention. It is a comparison table with the conventional band saw blade. It is explanatory drawing of the conventional band saw blade. It is explanatory drawing of the conventional band saw blade. It is explanatory drawing of the conventional band saw blade. It is explanatory drawing of the change state of the conventional band saw blade.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same reference numerals are given to components having the same functions as the components of the band saw blade described above, and redundant description will be omitted.

  Referring to FIG. 1, a band saw blade 1 according to the first embodiment of the present invention includes a body portion 2 similarly to the conventional band saw blade (see FIG. 10) described above, and a plurality of saw teeth 3 </ b> A to 3 </ b> A to 3 </ b> A. 7 teeth of 3G are provided as one tooth tip pitch group. The tooth tip pitch between the saw blades 3A to 3G is formed to the same tooth tip pitch as that of the conventional band saw blade. In the band saw blade 1, flat portions 7 </ b> A to 7 </ b> G parallel (parallel) to the traveling direction (longitudinal direction) of the band saw blade 1 are provided at the bottoms of the galettes 5 </ b> A to 5 </ b> G between the respective saw teeth 3 </ b> A to 3 </ b> G. .

  And in this 1st Embodiment, the structure largely different from the structure of the conventional band saw blade 1 shown in FIG. 10 is the position of the bottom part (plane part 7A-7G) in each galette 5A-5G, ie, each galette 5A ~. The depth of 5G is provided corresponding to the size of each tooth tip pitch. In other words, when the pitch dimension of each tooth tip pitch is P, and the depth dimension of each of the galettes 5A to 5G is H, H / P≈a constant relationship is set. Therefore, the area of the galette is larger than that of the band saw blade (see FIG. 10) having a constant depth of the galettes 5A to 5G.

  As understood from the above description, in the band saw blade 1 according to the first embodiment, the flat portions 7A to 7G are provided at the bottom of all the galettes 5A to 5G, and the depth of each galette 5A to 5G is set to each tooth. Since it is formed to a depth corresponding to the size of the tip pitch, the fatigue life is improved and the galette area is increased and cutting efficiency is improved as compared with the case where the bottom of the galette is arcuate. . In addition, the configuration in which the flat portions 7A to 7G are provided at the bottoms of all the galettes 5A to 5G makes it easier to manufacture the gear cutting tool as compared with the case where the bottoms are arcuate. .

  In the following embodiments including FIG. 1, the portion shown in an arc shape with a dotted line corresponding to each of the galettes 5 </ b> A to 5 </ b> G is a conventional one for comparison with the conventional band saw blade shown in FIG. 9. The bottom of the band saw blade is shown.

  FIG. 2 shows a band saw blade 1 according to the second embodiment. In the band saw blade 1, the depths of the galettes 5A to 5G in one tooth tip pitch group are set to two types. That is, the plurality of saw teeth 3G, 3A, 3B, 3C constitute a group having a large tooth tip pitch and a large tooth tip pitch, and the plurality of saw teeth 3D, 3E, 3F comprise a group having a small tooth tip pitch and a small tooth tip pitch. It is composed. The galettes 5G, 5A, 5B and 5C of the tooth tip pitch group having a large tooth tip pitch have the same depth (4.81 mm), and the galettes 5D and 5 of the tooth tip pitch group having a small tooth tip pitch. It is formed deeper than the galette depth (3.00 mm) in 5E and 5F.

  In the band saw blade 1, by repeating one tooth tip pitch group, each of the saw teeth 3G, 3A, 3B, 3C having a large tooth tip pitch has a continuous configuration, and each of the groups having a small tooth tip pitch is provided. The saw teeth 3D, 3E, 3F have a continuous configuration.

  In the band saw blade 1 having the above-described configuration, the same effect as that of the band saw blade according to the first embodiment described above is obtained, and the galette depth is set to two types, so that the gear cutting tool can be manufactured more easily. It will be. In addition, the galette depth is not limited to two types, and the galette depth corresponding to the number of teeth of the tooth tip pitch group can be three types or more. In this case, the type of galette depth is set to be smaller than the type of tooth tip pitch. In addition, the number of saw teeth in the group having a large tooth tip pitch is set to three, and the number of saw teeth in the group having a small tooth tip pitch is set to four teeth. It is also possible to reverse the number of teeth.

  FIG. 3 shows a third embodiment. In the band saw blade 1 according to this embodiment, the galettes 5D, 5E, and 5F of the saw teeth 3D, 3E, and 3F having a small tooth tip pitch are the conventional band saw blades. The flat surface portions 7A, 7B, 7C, and 7G are formed only at the bottoms of the galettes 5A, 5B, 5C, and 5G in the groups 3A, 3B, 3C, and 3G having a large tooth tip pitch. .

  The band saw blade 1 according to the third embodiment can achieve the same effects as the band saw blade of the above-described embodiment.

  FIG. 4 shows a fourth embodiment. In this embodiment, in order to avoid stress concentration at one point of the deepest part in the arc-shaped galette and to improve the fatigue life, In this configuration, the flat surface portion 7A is formed only at the bottom of the galette 5A of the saw tooth 3A having the largest tooth tip pitch. According to this configuration, since the flat portion 7A is provided at the bottom of the galette 5A having the deepest galette depth, which is a portion that easily breaks due to fatigue life, stress is applied to almost one point of the deepest portion of the galette 5A. Concentration can be avoided, and the fatigue life can be improved.

  The conventional band saw blades shown in FIGS. 9 and 10 and the band saw blades shown in FIGS. 1 to 4 are made of band steel under the same conditions, and the band saw blades are not loaded and are broken under the same conditions. As a result of the rotation experiment, the result based on the conventional band saw blade shown in FIG. 9 is as shown in FIG. As understood from the result of FIG. 5, when the structure is provided with a flat portion at the bottom of the galette, the fatigue life ratio is improved although the area ratio of the galette is reduced. And, in the comprehensive evaluation of the saw blade performance for both, it is superior to the conventional band saw blade.

  The above description has been made using specific dimensions in order to facilitate the description of the embodiment of the present invention, but can be changed as appropriate. In particular, the pitch of the tooth tip is not limited to the dimensions described in the embodiment, and the number of teeth in the tooth tip pitch group is not limited to the embodiment.

  FIG. 6 shows a band saw blade 1 according to a fifth embodiment of the present invention. This band saw blade 1 is a band saw blade having a plurality of saw teeth T1 to T8 (shown as T1 to T8 because the number of saw teeth is one more than the band saw blade of the above embodiment), Flat portions F1 to F8 parallel to (in parallel with) the longitudinal direction (traveling direction) of the band saw blade 1 are provided at the bottoms of all the galettes G1 to G8 during T8.

  The band saw blade 1 has a configuration in which eight teeth of saw teeth T1 to T8 are provided as one tooth tip pitch group and a set pattern pattern group, and includes straight teeth T1, right set teeth T2, left set teeth T3, and straight teeth T4. Since the tooth tip pitch between them is small, the galettes G1, G2, G3 between the saw teeth are formed shallow. Since the tooth pitch between the straight teeth T4, the right set teeth T5, the left set teeth T6, the right set teeth T7, the left set teeth T8, and the straight teeth T1 is large, the galettes G4, G5, G6 between the respective saw teeth. , G7, G8 are deeply formed.

  That is, in the band saw blade 1, a galette shallow group in which a plurality of saw teeth T1, T2, and T3 having a shallow galette depth are continuously provided in one tooth pitch group (clam pattern pattern group), and a galette depth. And a plurality of saw teeth T5, T6, T7, and T8 having a continuous depth, and a straight tooth T4 between the shallow galette group and the galette depth group. The number of right set teeth T2 and left set teeth T3 in the shallow galette group is equal, and the number of right set teeth T5, T7 and left set teeth T6, T8 in the galette depth group is set equal. .

  In the band saw blade 1, the bending positions of the left and right set teeth T2, T3, T5, T6, T7, and T8 are set to the bottom portions (plane portions F1, F2, and F3) of the galettes G1, G2, and G3 having a shallow galette depth. Assuming that the galette depth is 3 mm, which is the same as that of the conventional band saw blade shown in FIG. 11, the set bending length L1 of the set teeth T2 and T3 in the gallet shallow group is equal. Further, the set bending lengths L2 of the set teeth T5, T6, T7, and T8 in the galette depth group are equal to each other.

  That is, since the set teeth bending lengths L1 of the set teeth T2 and T3 are equal, the springback amounts when the set teeth T2 and T3 are bent at the same angle in the left and right directions are equal. The bending angle of the teeth T2 and T3 can be reversed (crushing processing) to the same angle (with the same absolute value) by reversing the sign of the bending angle. In addition, since the set bending length L2 is the same in the left and right set teeth T5, T6, T7, and T8, the set angle can be bent (set out) so that the absolute angles are equal to each other.

  Accordingly, the left and right set teeth T2, T3: T5, T6: T7, and T8 that are paired in the band saw blade 1 can be accurately set in the left and right direction, and the travel direction (longitudinal direction) of the band saw blade 1 can be accurately performed. The vibration in the left and right direction caused by the left and right set teeth that tend to occur in a direction perpendicular to the direction) can be effectively canceled and reduced, and the accuracy of the cut surface of the workpiece can be improved. It is. That is, the band saw blade having the above configuration can achieve the same effect as the band saw blade according to the above-described embodiment, and can effectively reduce the vibration in the left-right direction regardless of the band saw blade provided with the left and right set teeth. In addition, the cutting accuracy can be improved.

  FIG. 7 shows a band saw blade 1 according to the sixth embodiment. The band saw blade 1 is a band saw blade having a plurality of saw teeth T1 to T14, and a flat portion parallel to the longitudinal direction of the band saw blade 1 is formed at the bottom of each galette G1 to G14 between the saw teeth T1 to T14. F1 to F14 are provided.

  A first galette shallow group having a plurality of saw teeth T1, T2, T3 having a shallow galette depth and a plurality of saw teeth T5, T6, T7 having a deep galette depth are provided. A configuration including straight teeth T4 between the galette depth groups is provided as a first tooth tip pitch group PG1. Further, a second galette shallow group having a plurality of saw teeth T8, T9, T10 having a shallow galette depth and a second galette shallow group having a plurality of saw teeth T12, T13, T14 having a deep galette depth are provided. A configuration including straight teeth T11 between the galette depth group is provided as a second tooth tip pitch group PG2.

  The first addendum pitch group PG1 and the second addendum pitch group PG2 are provided as one set pattern pattern APG. The number of teeth in the first tooth tip pitch group PG1 is the same as that in the second tooth tip pitch group PG2, and the tooth tip pitch is the same, and the tooth tip pitch is different in the first tooth tip pitch group PG1. In the arrangement order of each tooth tip pitch and the second tooth tip pitch group PG2, the arrangement order of each tooth tip pitch having a different tooth tip pitch is configured to be equal. However, the left and right set teeth T9, T10, T12, T13, and T14 in the second addendum pitch group PG2 corresponding to the left and right set teeth T2, T3, T5, T6, and T7 in the first addendum pitch group PG1. The arrangement pattern (clam pattern) is set in reverse.

  In the band saw blade 1 having the above-described configuration, the flat portions F1 to F14 are provided at the bottoms of all the galettes G1 to G14, and the set bending lengths L1 of the left and right set teeth in the same tooth tip pitch group. Since L2 has an equal length, the same effect as the band saw blade described above is obtained. In addition, since the arrangement pattern of the left and right set teeth of the first addendum pitch group PG1 and the arrangement pattern of the set teeth of the left and right set of the second addendum pitch group PG2 are opposite, it is left and right with respect to the traveling direction of the band saw blade. Directional vibration can be effectively reduced.

  In order to compare the conventional band saw blade shown in FIGS. 11 and 12 and the band saw blade in the explanatory view with the band saw blade shown in FIGS. 6 and 7, the average pitch and average galette of the conventional band saw blade shown in FIG. FIG. 8 shows a comparison when the areas are 100%. As can be understood from FIG. 8, the average pitch of the band saw blades shown in FIGS. 6 and 7 is also 100%, whereas the average galette areas are increased to 128% and 127%, respectively. Accordingly, the ability to store chips generated during cutting (cutting) of the workpiece is increased, and accordingly, the cutting speed can be increased and the cutting efficiency can be improved.

  In addition, since the flat portion is provided at the bottom of all galettes, the fatigue life can be improved, and the clam bending lengths L1 and L2 are the same in the same tooth tip pitch group. Therefore, the cutting accuracy can be improved. Furthermore, since the type of gallet depth is less than the type of tooth tip pitch, the configuration of the gear cutter can be simplified, and the band saw blade can be manufactured at a lower cost.

1 Band saw blade 3A-3G Sawtooth 5A-5G Galette 7A-7G Planar part T1-T14 Sawtooth G1-G14 Galette F1-F14 Plane part L1, L2 Claw bending length

Claims (13)

  A band saw blade having a plurality of saw teeth, having a plurality of types of tooth tip pitches between the respective saw teeth, and a plurality of types of galette depths provided between the respective saw teeth. A band saw blade comprising a flat portion parallel to the longitudinal direction of the band saw blade at the bottom of the deep galette.   The band saw blade according to claim 1, wherein the depth of the galette between the saw teeth corresponds to the size of the tooth tip pitch between the saw teeth.   2. The band saw blade according to claim 1, comprising a plurality of tooth tip pitch groups having different tooth tip pitches between the respective saw teeth, wherein the tooth tip pitch group having a large tooth tip pitch has a galette depth smaller than the tooth tip pitch. A band saw blade formed deeper than the pitch group galette depth.   The band saw blade according to claim 3, wherein each galette depth in the same tooth tip pitch group is the same depth.   The band saw blade according to any one of claims 1 to 4, wherein a flat portion parallel to the longitudinal direction of the band saw blade is provided at the bottom of all the galettes.   6. The band saw blade according to claim 5, wherein the type of galette depth is smaller than the type of tooth tip pitch.   The band saw blade according to any one of claims 1 to 6, wherein the clad bend lengths of the left and right set teeth having the same galette depth on the scooping surface side are equal.   The band saw blade according to claim 7, wherein the number of right and left set teeth having the same set bending length in the tooth tip pitch group is the same.   The band saw blade according to claim 8, wherein a galette depth group including a plurality of saw teeth having a deep galette depth in the tooth tip pitch group and a plurality of saw teeth having a shallow galette depth are provided. A band saw blade comprising: a shallow group, and a straight tooth between the galette depth group and the galette shallow group.   The band saw blade according to claim 9, wherein the set bending lengths of the left and right set teeth in the galette depth group are equal to each other, and the set bending lengths of the left and right set teeth in the gallet shallow group are set equal to each other. Band saw blade.   The band saw blade according to claim 9 or 10, wherein arrangement patterns of left and right set teeth in a tooth tip pitch group provided adjacent to each other are opposite to each other.   A band saw blade having a plurality of saw teeth, comprising a flat portion parallel to the longitudinal direction of the band saw blade at the bottom of all the galettes between the saw teeth, and continuously having a plurality of saw teeth having a deep galette depth. A straight tooth is provided between the galette depth group and the galette shallow group continuously provided with a plurality of saw teeth having a shallow galette depth, and the number of right and left clam teeth in the galette depth group is the same, and the galette A band saw blade having the same number of left and right set teeth in the shallow group.   A band saw blade having a plurality of saw teeth, comprising a flat portion parallel to the longitudinal direction of the band saw blade at the bottom of all the galettes between the saw teeth, and continuously having a plurality of saw teeth having a deep galette depth. A first tooth tip pitch group includes a structure having straight teeth between a galette depth group and a galette shallow group continuously provided with a plurality of saw teeth having a shallow galette depth. A second tooth tip pitch group having the same number of teeth as that of the group and the arrangement pattern of the left and right set teeth is reversed, and the first and second tooth tip pitch groups constitute one set pattern pattern group. A band saw blade characterized by

Images