JP6196043B2 - Band saw blade and method of using the same - Google Patents

Description

In the present invention, superhard abrasive grains such as diamond, cubic boron nitride (CBN), and alumina oxide (Al ₂ O ₃ ) are fixed to one side edge of a metal belt-shaped base material by electrodeposition or the like. In addition, the present invention relates to a band saw blade having alternating cutting blade portions and galette portions and a method of using the same, and more specifically, the fatigue life of the base material can be increased and the accuracy of the cutting surface of the workpiece can be improved. The present invention relates to a band saw blade and a method of using the same.

  A band saw blade in which carbide abrasive grains such as diamond are electrodeposited on one side edge of a metal band-shaped base material is known as an electrodeposition band saw or the like (see, for example, Patent Documents 1, 2, and 3).

JP 2005-145726 A JP 2006-221958 A JP 2008-44018 A

  As shown in FIGS. 1A, 1B, and 1C in Patent Document 1, the electrodeposition band saw is electrodeposited with abrasive grains over the entire length of one side edge of the belt-shaped base material. The flat type (Fig. 1 (a)) of the configuration described above, the wave type (Fig. 1 (b)) provided alternately with cutting blades and galettes electrodeposited with abrasive grains, and cutting blades with electrodeposited abrasive grains There is a pattern type (FIG. 1 (c)) with appropriate intervals. Further, the electrodeposition band saw includes a saw blade type in which a saw tooth is cut on one side edge of a belt-shaped base material, and abrasive grains are electrodeposited on the tip side of the saw tooth.

  By the way, there is a wave-type band saw blade having a configuration as shown in FIG. 1 as a band saw blade alternately provided with cutting blade portions and gallet portions electrodeposited with abrasive grains. That is, the band saw blade 1 has a configuration in which cutting edge portions 5 and gallet portions 7 electrodeposited with abrasive grains are alternately provided on one side edge of a metal belt-shaped base material 3, 5, the length of the base material 3 in the longitudinal direction (left-right direction in FIG. 1A) is longer than the length of the galette portion 7 in the same direction.

  In the band saw blade 1 having the above-described configuration, the cutting edge portion 5 swings in the thickness direction of the base material 3 (the direction perpendicular to the paper surface in FIG. 1A) by the width W of electrodeposition. The cut surface can be a good cut surface. Further, the presence of the galette 7 can effectively discharge chips, and for example, can cut a workpiece having a long cutting length.

  However, in the band saw blade 1 having the above-described configuration, the galette portion 7 is formed on one side edge of the strip-shaped base material 3, and therefore the width dimension of the base material 3 in the portion of the galette portion 7 (FIG. 1A). In the vertical direction) is smaller than the width of the base material 3 in the portion of the cutting edge portion 5. And since the said cutting blade part 5 has fixed the diamond abrasive grain etc. by nickel plating etc., the cutting blade part 5 is thicker only by nickel plating or a diamond abrasive grain.

  Therefore, when the band saw blade 1 is formed in an endless shape and is hung on the drive wheel and the driven wheel in the band saw machine, the cutting blade portion 5 portion is compared with the galette portion 7 portion of the drive wheel and the driven wheel. It is difficult to bend along the circumference. Therefore, the part of the galette part 7 is curved (the curvature is large) compared with the part of the cutting edge part 5. That is, in the band saw blade 1, there is a difference in bending between the portion of the cutting edge portion 5 and the portion of the galette portion 7, and a concentration of bending stress occurs near the bottom portion of the galette portion 7, and breakage occurs from this portion. There is a problem that it is likely to occur.

  Further, in the band saw blade 1, as shown in FIG. 1A, when viewed from the front, the straight line portion 9 of the edge of the cutting blade portion 5 and the tangent line at the end of the curved portion 11 of the galette portion 7 are In the crossing portion, the straight portion 9 and the curved portion 11 are connected by a small curved portion 13 having a small curvature radius. Although the sharpness of the cutting edge portion 5 is improved as the curvature radius of the small curved portion 13 is reduced, there is a problem that chipping is likely to occur. Further, when the curvature radius of the small curved portion 13 is reduced, there is a problem that when electrodepositing abrasive grains such as diamond, electrolysis tends to concentrate and the plating layer tends to be thicker than other portions.

  Furthermore, in the above-described configuration, the small curve portion 13 is perpendicular to the paper surface in the thickness direction of the base material 3 (see FIG. 1A), with the tangent line 15 near the bottom of the concave curve portion 11 in the galette portion 7 as a node. There is a problem that vibration is likely to occur in the direction) and the cut surface is likely to be roughened.

The present invention has been made in view of the above-described problems, and is a band saw blade provided alternately with a cutting blade portion and a gallet portion, each having an abrasive grain fixed to one side edge of a metal belt-like base material. The cutting edge portion has a linear plane portion parallel to the longitudinal direction of the base material at the top, and the ratio of the length of the linear plane portion to the length of the galette portion is The range of 60:40 to 10:90, or the range of 50:50 to 20:80, and the cutting blade portion and the galette portion are convex curved surface portions of the galette portion connected to the end portion of the flat portion. And a concave curved surface portion of the galette portion.

  Further, in the band saw blade, the cutting blade portion has a linear flat surface portion parallel to the longitudinal direction of the base material at the top portion of the cutting blade portion, and a convex curved surface appropriately connected to the bottom portion of the galette portion. The angle between the tangent plane with respect to the curved surface portion and the extended portion of the linear plane portion at the intersection of the plane portion and the plane portion is in the range of 0 ° to 40 °, or in the range of 10 ° to 30 °. It is characterized by being.

  Further, in the band saw blade, the convex curved surface portion is connected to a concave curved surface portion connected to a bottom portion of the galette portion.

Moreover, in the said band saw blade, when the length of the said plane part in the said cutting blade part is set to X, the length of the said galette part is the range of 2X / 3-9X or the range of X-4X, It is characterized by the above-mentioned. To do.

  Further, the method of using the band saw blade, wherein after the band saw blade is configured in an endless shape and used in a band saw machine for a desired time, the inner peripheral surface of the endless band saw blade is an outer peripheral surface. The outer peripheral surface is reversed and reused.

  Further, in the method of using the band saw blade, the traveling direction of the band saw blade is reversed so that both end sides of the cutting blade portion are at the head of the traveling direction of the band saw blade.

  According to the present invention, in a wave type band saw blade provided alternately with a cutting edge portion and a galette portion with abrasive grains fixed to one side edge of a metal belt-shaped base material, the fatigue life of the base material As a result, the above-described problems can be solved.

It is explanatory drawing which shows the structure of the conventional wave type band saw blade. It is explanatory drawing which shows the structure of the band saw blade which concerns on embodiment of this invention. It is explanatory drawing which showed the relationship between the ratio of the length of the cutting-blade part in a band saw blade, and the length of a gallet part, cutting-blade lifetime, and a possible cutting speed. It is sectional explanatory drawing of the thickness direction of the band saw blade provided with the electrodeposition surface layer which electrodeposited the diamond abrasive grain on the one side edge of the strip | belt-shaped base material. It is explanatory drawing which showed the difference of the plating film thickness of the center part of a cutting blade part by the difference of the magnitude | size of angle (theta) shown in FIG.

  Hereinafter, the band saw blade according to the embodiment of the present invention will be described with reference to the drawings. Components having the same functions as those of the band saw blade 1 described above are denoted by the same reference numerals, and redundant description is omitted.

  Referring to FIG. 2, a band saw blade 1 according to an embodiment of the present invention includes a base material 3 in the same manner as the band saw blade described above, and electrodeposits abrasive grains on one side edge of the band-shaped base material 3. The cutting blade portions 5 and the galette portions 7 are alternately provided. The cutting blade part 5 and the galette part 7 are configured as follows. That is, the cutting edge portion 5 and the galette portion 7 include a small-diameter convex arc-shaped small curved portion (convex curved surface portion) R1 and a large-diameter concave arc-shaped large curved portion (concave curved surface portion) R2. The cutting blade portion 5 is formed by connecting the top portion of the small curved portion R1 at an appropriate height position by a straight portion (straight plane portion) L1 parallel to the longitudinal direction of the base material 3. It is the form which cut | disconnected or contact | connected the top part. And the said galette part 7 is formed in the circular-arc-shaped recessed part by the said large curve part R2. Accordingly, the cutting blade portions 5 are formed at an equal pitch.

  By the way, since the said linear part L1 has the thickness of the base material 3, it actually exhibits a linear plane. The small curve portion R1 and the large curve portion R2 are actually curved surfaces. However, since it seems that the explanation using “lines” is easier to understand than “surface”, it will be explained with expressions using “lines” such as straight lines and curved parts. .

  In addition, as a form of the said cutting-blade part 5, it is also possible to set it as the form which changed only the length dimension of the said linear part L1 suitably, for example, without restricting to the said form. Moreover, the galette part 7 can also have a form in which a straight part is provided in the center of the bottom part and only the length of the straight part is appropriately changed. That is, the cutting edge 5 can be formed at unequal pitches by forming the galette part 7 in the form in which the large curved part (concave curved part) R2 is connected to both ends of the straight part at the bottom center. Is. Furthermore, the depth of the galette part 7 can be set to a desired depth.

  In the above configuration, an angle θ between a tangent line M that is in contact with the small curve portion (convex curved surface portion) R1 at an end portion of the straight line portion L1 and an extension line of the straight line portion L1 is set to a desired angle. is there. The angle θ can be set in the range of 0 ° to 90 °. By the way, when the angle θ is 0 °, a straight line portion L1 is provided in the tangential direction at the top of the small curve portion R1, and the end portion (in the straight portion L1 of the cutting edge portion 5) The cutting edge of the cutting edge portion 5 becomes too smooth, and the cutting (cutting) resistance increases. In addition, when the angle θ is 90 °, the cutting edge portion 5 has a sharp cutting edge, which tends to cause chipping, and when electrodepositing diamond abrasive grains, the electric field is concentrated and the plating layer is thick. Become. Further, the cutting edge of the cutting edge portion 5 is the part that works most as a cutting blade during the work of cutting the workpiece by the cutting edge portion 5, and when the angle of the cutting edge becomes sharp, as described in FIG. The strength in the thickness direction of the material 3 is reduced, and vibration is likely to occur.

  Therefore, an appropriate range exists in the angle θ between the extension line of the straight line portion L1 provided at the top of the cutting edge portion 5 and the tangent line M.

  By the way, in the said structure, when the length of the linear part L1 in the cutting-blade part 5 becomes long more than necessary, the contact area of the diamond abrasive grain electrodeposited to the cutting-blade part 5 and a workpiece | work will increase, and cutting resistance will become large. Therefore, it becomes difficult to increase the cutting speed. Further, as described above, the portion of the galette portion 7 is formed by the concave curved surface of the large curved portion R2, and the cutting edge portion of the cutting blade portion 5 is formed by the small curved portion R1 of the convex curved surface connected to the large curved portion R2. In the case of forming at a constant pitch, if the radius of the large curved portion R2 is increased in consideration of the fatigue life of the base material 3, the depth of the galette portion 7 becomes shallow. Therefore, the filling of the chip into the galette portion 7 is accelerated, it is difficult to smoothly discharge the chip, and the cutting speed is decreased. Further, when the radius of the large curved portion R2 is increased to form the galette portion 7 deeply, the straight portion L1 in the cutting edge portion 5 is shortened, the diamond abrasive grains in the cutting edge portion 5 are reduced, and the life of the band saw blade is shortened. Shorter.

  Therefore, if the radius of the large curved portion R2 is reduced in order to keep the length of the straight line portion L1 in the cutting blade portion 5 constant and the pitch P constant and to improve chip discharge, the length increases. Although the constant depth of the galette portion 7 can be increased, the fatigue life of the base material 3 is shortened. In this case, since the straight portion is provided in the center of the galette portion 7 and the large curved portion R2 is connected to both ends of the straight portion, the capacity of the galette portion 7 can be increased. The fatigue life can be relatively long.

By the way, as shown in FIG. 2, when the pitch of the straight line portion L1 in the cutting blade portion 5 is P, the length of the straight portion L1 of the cutting blade portion 5 is T, and the length of the galette portion 7 is G, P = T + G. And the length P of the straight part L1 in the cutting edge part 5, the curvature and radius of the large curve part R2 of the galette part 7, and the small curve part R1 are the said pitch P of the depth (gallet depth) of the galette part 7. It is set within a range that satisfies the value.

  As described above, when the pitch P of the cutting blade portion 5 is constant, it is represented by P = T + G. Therefore, if the length T of the straight portion L1 in the cutting blade portion 5 is increased, the length of the galette portion 7 is increased. G becomes smaller. Here, when the length T of the linear portion L1 in the cutting edge portion 5 is increased (longer), the life of the cutting edge portion 5 is increased, but the diamond abrasive grains electrodeposited on the cutting edge portion 5 and the work material ( Since the contact area with the workpiece increases and the cutting resistance increases, it is difficult to increase the cutting speed (the cutting speed of the band saw blade and the traveling speed of the band saw blade with respect to the workpiece). Contrary to the above, when the length T of the straight line portion L1 in the cutting edge portion 5 becomes small (short), the contact area between the diamond abrasive grains electrodeposited on the cutting edge portion 5 and the work material becomes small. Although the resistance decreases, the wear is quick and the life of the cutting edge portion 5 is shortened.

  As already understood, within the range of the constant pitch P, when the length T of the straight line portion L1 in the cutting blade portion 5 is increased, the length G of the galette portion 7 is shortened. And since there is a causal relationship between the length T of the cutting edge part 5 and the cutting edge life, and there is a causal relation between the length T of the cutting edge part 5 and the cutting speed, the cutting edge part It has been found that the relationship between the length T of 5 and the length G of the galette part 7 affects the cutting edge life and possible cutting speed.

  By the way, when the work is cut by hanging the band saw blade 1 on the drive wheel and the driven wheel provided on the band saw machine, the cutting resistance becomes excessive and no large bending occurs, and the chip cannot be discharged and vibrates greatly. Therefore, it is necessary to appropriately set the cutting speed of the band saw blade 1, that is, the cutting speed of the band saw blade with respect to the workpiece and the traveling speed of the band saw blade so that the cutting accuracy of the cut surface does not deteriorate. Here, the maximum value of the appropriate cutting speed is the maximum value of the possible cutting speed, and when the workpiece is cut at a cutting speed exceeding the maximum value of the possible cutting speed, for example, cutting or the like is performed. This will result in a defective product.

  Therefore, with P = T + G as a constant condition, the cutting edge life and possible when the ratio of the length T of the cutting edge portion 5 to the length G of the galette portion 7 is 50%, that is, T: G = 50: 50. Assuming that the maximum value of the cutting speed is 100%, how the cutting edge life and the possible cutting speed change when the ratio of the length T to the length G is variously changed is shown in FIG. As shown in FIG. 3, an experiment was carried out by keeping the traveling speed of the belt constant and varying the cutting speed of the band saw blade with respect to the workpiece. In the above experiment, as shown in FIG. 4, a band saw provided with an electrodeposition surface layer 17 in which diamond abrasive grains are electrodeposited with an appropriate width from the cutting edge portion 5 to the bottom portion of the galette portion 7 in the base material 3. Blade 1 was used. The length of the straight line portion L1 (the length of the cutting blade portion 5) T, the length G of the galette portion 7, and the radius of the small curved portion R1 and the large curved portion R2 in the cutting blade portion 5 are determined by the electrodeposition. Measurement was performed with a band saw blade 1 having a surface layer 17.

  As apparent from FIG. 3, when the cutting edge life and possible cutting speed at T: G = 50: 50 are set to 100%, the cutting edge life gradually increases when T: G changes from 40:60 to 10:90. It can be seen that the possible cutting speed gradually increases as it decreases. That is, when the length T of the cutting edge 5 is shortened, the cutting resistance can be reduced and the possible cutting speed can be increased, but the cutting edge life is shortened due to the short length T.

  Further, it can be seen that when T: G is changed from 60:40 to 80:20, the cutting edge life tends to increase gradually, and the possible cutting speed tends to decrease gradually. That is, as the length T of the cutting edge portion 5 increases, the cutting edge life increases, but the contact area between the diamond abrasive grains and the workpiece in the cutting edge portion 5 increases, cutting resistance increases, and possible cutting speed is increased. It turns out that it is difficult to enlarge.

  From the experimental results shown in FIG. 3, when the ratio T: G between the length T of the cutting edge portion 5 and the length G of the galette portion 7 becomes 70:30 or 80:20, the cutting edge life becomes longer. When the ratio of increasing the blade life is compared with the ratio of decreasing the possible cutting speed, the ratio of decreasing the cutting possible speed is large. Therefore, considering the work cutting efficiency of the workpiece, the ratio of T: G is 60: A range of 40 to 10:90 is desirable. In consideration of the rate of change of the cutting edge life and the rate of change of the possible cutting speed, and considering the cutting efficiency, the ratio of T: G is preferably in the range of 50:50 to 20:80.

By the way, the above description has illustrated the case where the pitch P is constant. However, there is a band saw blade whose pitch P varies in various ways. In this case, if the length T of the straight line portion L1 in the cutting edge portion 5 is constant and the length G of the galette portion 7 is changed, T: G is preferably in the range of 60:40 to 10:90, A range of 50:50 to 20:80 is desirable. In other words, when the length of the straight line portion L1 in the cutting blade portion 5 is X, the length G of the galette portion 7 is in the range of 2X / 3 to 9X, more preferably in the range of X to 4X. Is desirable.

  As already understood, conversely to the above, if the length of the galette part 7 is kept constant as Y and the length T of the cutting edge part 5 changes, T = 3Y / 2 to Y / In the range of 9, more preferably in the range of T = Y to Y / 4. In this way, by adopting a configuration in which the lengths of the cutting blade portions 5 are variously changed, the weights of the respective cutting blade portions 5 are different and resonance can be prevented, so that vibrations generated during workpiece cutting can be effectively prevented. It can be suppressed. In addition, when the length T of the cutting blade part 5 becomes longer than the length G of the galette part 7, the possible cutting speed is limited to the shortest part of the galette part 7 (in relation to the chip removal capability and the like). The cutting speed may be limited. Therefore, in this case, it is desirable that the length T of the cutting edge portion 5 is within ± 30% of the length G of the galette portion 7, more preferably within ± 20%.

  As described above, in the wave-type band saw blade 1 having the cutting blade portions 5 and the galette portions 7 alternately, the tangent line M that is in contact with the small curved portion R1 at both ends of the straight portion L1 in the cutting blade portion 5; With the configuration in which the extension line of the straight line portion L1 intersects at an angle θ, the boundary between the cutting edge portion 5 and the galette portion 7 can be clarified, and the function of the galette portion 7 can be improved. . That is, when the cutting edge 5 is symmetrical about the longitudinal center of the straight portion L1, and the galette 7 is symmetrical about the longitudinal center of the galette 7, The function of the cutting blade part 5 and the function of the galette part 7 are easily clarified at the boundary between the respective center portions of the cutting blade part 5 and the galette part 7.

  The said structure WHEREIN: The both ends (blade edge) of the said cutting blade part 5 are the parts which contribute most to the cutting process of a workpiece | work. In this case, a part of the small curve portion R1 also functions as the cutting edge, and is an important component for cutting performance. That is, when the diameter of the small curved portion R1 is increased, the difference in the plating film thickness between the central portion in the longitudinal direction of the cutting blade portion 5 and the electrodeposition surface layer on both end sides can be reduced. In this case, the angle θ is reduced, and the impact applied to the workpiece with the cutting edge during cutting of the workpiece is reduced, and the portion acting as the cutting edge of the small curved portion R1 is increased, in other words, the cutting edge portion. Since the length T of 5 becomes long and the cutting resistance tends to increase, it is not desirable to reduce the angle θ.

  Therefore, when the diameter of the small curved portion R1 is reduced and the angle θ is increased, the chips generated at the position of the cutting edge at the time of cutting the workpiece are easily guided to the galette portion 7, and the chips from the cutting processing position by the cutting edge are obtained. Is easy to remove, and the cutting speed can be increased. However, if the diameter of the small curved portion R1 is reduced, the difference in the plating film thickness between the central portion and both ends of the cutting blade portion 5 is increased, and chipping of the blade edge is likely to occur. Therefore, it is not desirable to increase the angle θ more than necessary, or to reduce the diameter of the small curve portion R1 more than necessary.

  In view of the above, in order to find the desired angle θ, the thickness of the base material 3 is set to 1.0 mm, the radius of the small curved portion R1 is set to 3 mm, and the length of the linear portion L1 in the cutting edge portion 5 is set to 5 mm. When the difference in plating film thickness between the central portion and both end sides of the cutting edge portion 5 was experimentally determined, data as shown in FIG. 5 was obtained. As is apparent from FIG. 5, when the angle θ is 40 ° or more, both ends of the straight portion L1 in the cutting edge portion 5 become sharp, and an electric field is concentrated during electrodeposition of diamond abrasive grains, resulting in a thick plating film. The trend becomes larger. In order to suppress this phenomenon, it is necessary to slow down the electrodeposition plating, which tends to increase the processing time and cost. Therefore, it is desirable that the angle θ is 40 ° or less, more preferably 30 ° or less.

  By the way, when the angle θ is reduced, the depth of the galette portion 7 becomes insufficient when the pitch P is small and the diameter of the large curved portion R2 is kept constant. Here, when the diameter of the large curved portion R2 is reduced and the galette portion 7 is deepened, the width of the base material 3 is reduced and stress is easily concentrated on the galette portion 7, and the fatigue life of the base material 3 is shortened. Tend to be. In addition, by appropriately setting the angle θ, the diameters of the small curve portion R1 and the large curve portion R2 can be set to desired diameters, and the length of the straight portion L1 and the galette portion in the cutting edge portion 5 are set. The length and depth of 7 can be set to desired dimensions.

  By the way, since the said cutting blade part 5 in the said band saw blade 1 is a structure provided with the blade edge | tip at the both ends of the linear part L1, in order to use the said blade edge | tip effectively, the band saw blade 1 is rotated to a normal | positive direction. It is also possible to reverse the traveling direction of the band saw blade 1 and use it by repeating the rotation in the opposite direction as appropriate. As described above, in order to reverse the traveling direction of the band saw blade 1, the motor provided in the band saw blade is rotated forward and reverse, or the inner peripheral surface of the endless band saw blade is the outer peripheral surface. It is also possible to reverse the surface and the outer peripheral surface.

  As is clear from the above description, the band saw blade 1 according to the present embodiment has a ratio of the length of the cutting blade portion to the length of the galette portion in the longitudinal direction of the base material of 60:40 to 10:90. Range, or a range of 50:50 to 20:80, and the cutting edge portion includes a linear flat portion parallel to the longitudinal direction of the base material at the top of the cutting edge, and at the bottom of the galette portion. The angle between the tangent plane with respect to the curved surface portion and the extended portion of the linear planar portion at the intersection of the appropriately curved convex curved surface portion and the flat surface portion is in the range of 0 ° to 40 °, or It is in the range of 10 ° to 30 °.

  Therefore, the fatigue life of the base material in the band saw blade can be extended, and the cutting accuracy on the cut surface of the workpiece can be improved.

DESCRIPTION OF SYMBOLS 1 Band saw blade 3 Base material 5 Cutting edge part 7 Galette part 17 Electrodeposition surface layer R1 Small curve part (convex curved surface part)
R2 Large curve part (concave curved part)
L1 Straight part M Tangent

Claims (6)

A band saw blade provided alternately with a cutting blade portion and a galette portion with abrasive grains fixed to one side edge of a metal belt-shaped base material, wherein the cutting blade portion has a longitudinal direction of the base material and It is a form provided with the parallel linear plane part in the top part, and the ratio of the length of the said linear plane part and the length of the said galette part is the range of 60: 40-10: 90, or 50: 50-20. : The range of 80, and the cutting edge part and the galette part are connected to the convex curved surface part of the galette part connected to the end part of the flat part and the concave curved part of the galette part. A band saw blade characterized by that.   2. The band saw blade according to claim 1, wherein the cutting blade portion has a linear flat portion parallel to the longitudinal direction of the base material at the top of the cutting blade, and is appropriately connected to the bottom of the galette portion. The angle between the tangent plane with respect to the curved surface portion and the extended portion of the linear planar portion at the intersection between the curved surface portion and the flat surface portion is in the range of 0 ° to 40 °, or 10 ° to 30 °. Band saw blade characterized by being in the range of   The band saw blade according to claim 2, wherein the convex curved surface portion is connected to a concave curved surface portion connected to a bottom portion of the galette portion. The band saw blade according to any one of claims 1 to 3, wherein when the length of the flat surface portion in the cutting blade portion is X, the length of the galette portion is in the range of 2X / 3 to 9X or X to 4X. Band saw blade characterized by being in the range of   It is a usage method of the band saw blade in any one of Claims 1-4, Comprising: After using a band saw blade for endless shape and using it for a desired time in a band saw machine, the inner peripheral surface in an endless band saw blade is an outer peripheral surface. A method of using a band saw blade, wherein the inner peripheral surface and the outer peripheral surface are reversed and reused so that   It is a usage method of the band saw blade in any one of Claims 1-4, Comprising: The traveling direction of a band saw blade is reversed so that the both ends side of the said cutting-blade part may become the head of the traveling direction of a band saw blade. How to use a band saw blade.

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