JP5173336B2 - Saw blade - Google Patents

Description

  The present invention relates to a saw blade such as a band saw, a circular saw, and a hax saw. More specifically, for example, a hard tip such as cemented carbide, cermet, or ceramic is joined to a tooth tip, and bending of a clam is performed. Not related to saw blades.

  Conventionally, a band saw machine has been used as an apparatus for cutting a large workpiece made of metal, for example. As the band saw blade used in this band saw machine, a bimetal band saw blade using a high-speed tool steel as a cutting edge and a tough alloy steel as a body part is currently prime.

  However, considering the fact that hard chips such as cemented carbide and ceramics are the prime tools used for lathes and milling machines, band saw blades are still developing to hard chips compared to general tools. A tool.

  There are many factors that do not make the band saw blade abruptly shift to hard chips, especially carbide chips. Among them, the price problem is significant, and in order to popularize carbide band saw blades, we will thoroughly reduce costs. There is a need.

  However, the price should be evaluated in comparison with performance, and the cost reduction with negligible cutting performance cannot be accepted by the market.

  Therefore, as with other general tools, there is a need for an optimum design of a carbide band saw blade that pursues both cost and performance.

  In general, a cemented carbide saw blade is formed by joining a cemented carbide tip with an allowance for cutting to a tooth tip, and thereafter polishing it into a predetermined shape using a diamond grindstone.

  In the saw blade manufacturing process, this polishing process greatly affects cost and performance.

That is, if the shape is easy to polish, the cost can be reduced. As for the cutting performance, if the polishing accuracy is poor, premature bends and the like occur, so it is necessary to set a tooth profile that allows easy maintenance of the polishing accuracy.

  Carbide saw blades can be broadly classified as compared to the vicinity of the cemented carbide tip joints, such as the clam swing-out type carbide blades that have been bent after the teeth are ground, and the tail blades of pigeons. In addition, there is a batachisari type carbide band saw blade that has been polished into a trapezoidal shape with a wider tooth tip.

  The former set-up type is a one-generation previous saw blade composed of straight teeth and left and right set teeth, and is used for cutting hard materials that cannot be cut with high-speed tool steel at a relatively slow speed. .

  The latter type of toothbrush type includes a toothed tooth with left and right clams with one tooth. When the left clam tooth cuts the workpiece, like the clam swing type, the right clam tooth cuts the workpiece. Since there is no run-out of the tooth tip, such as going to the left when performing, accurate and efficient cutting is possible.

  Nowadays, in order to cut a general steel material at a higher speed than a band saw blade using a high-speed tool steel, a batachisari type carbide band saw blade is used.

As a saw blade provided with a hard tip at the tooth tip, for example, there are Patent Documents 1 to 5.
Japanese Utility Model Publication No. 4-109811 JP-A-6-39631 JP-A-61-241017 Japanese Utility Model Publication No. 63-32719 JP 2006-231480 A

  In Patent Document 1, a saw blade 1 shown in FIG. 12 is described. 12 shows the cutting direction (main component force direction, perpendicular to the paper surface in FIG. 12) of the saw blade 1 perpendicular to the cutting direction (downward direction in FIG. 12) of the saw blade 1 with respect to the workpiece (not shown). It is shown in a state where a plurality of saw teeth are overlapped when viewed from the direction. The saw blade 1 has a configuration in which a leading saw tooth 9 and a trailing saw tooth 11 having hard chips 5 and 7 are provided as a group at the tip of the saw blade of the body member 3 in the saw blade 1.

  In the above configuration, the hard chip 5 in the leading saw blade 9 has a flank polishing process that forms a straight ridge line when viewed from the cutting direction of the saw blade 1 (the state shown in FIG. 12). 5A, 5A, 5C, 5E, 5E, 5E, and 5E. In the case of the hard tip 7 in the subsequent sawtooth 11, there are three surfaces of the tip surface 11A and the left and right side surfaces 11B and 11C. Sawtooth polishing is performed mainly on the left and right side surfaces, the clearance surface, the scooping surface, and the left and right inclined surfaces, but the scuffing surface polishing is indispensable in common for all saw blades as sawtooth polishing processing. The grinding process of the scooping surface is omitted from the number of polishing processes.

  As understood from the above, the number of polishing processing of the hard chips 5 and 7 in one group including the leading saw blade 9 and the trailing saw blade 11 in the saw blade 1 is 5 surfaces 5A to 5E in the hard chip 5 and the hard chip 7. Is the sum of the three surfaces 11A to 11C, and the total is eight surfaces. Therefore, there are four surfaces on average per saw tooth. However, if the grinding process of the scooping surface is included, the average is five. However, as mentioned above, the scoring process of the scooping surface is a process common to all saw teeth, and therefore the grinding process of the scooping surface is omitted. In the following explanation, the grinding process of the scooping surface is omitted from the number of polishing processes.

  Further, in the saw blade 1, the leading saw blade 9 is an H saw tooth having a large tooth height from the reference position, and the succeeding saw blade 11 is an L saw tooth having a small tooth height from the reference position. A width dimension S of a cutting groove (cutting groove) formed by cutting when the workpiece is cut by the saw blade 1 is a width in a direction perpendicular to the cutting direction of the hard chip 7 provided in the subsequent sawtooth 11. It is equal to the dimension (width dimension in the left-right direction in FIG. 12).

  Chips generated during machining of the cutting grooves formed when the workpiece is cut by the saw blade 1 are divided into three as is well known, and the chips are not sufficiently subdivided. The cutting force acting on 11 is large. Further, corner angles on both sides of the distal end portion of the hard tip 7 in the subsequent sawtooth 11 (angle formed by the distal end surface 11A and the left and right side surfaces 11B and 11C) are 90 ° or less. The corner angle on both sides (the angle formed between the tip surface 5A and the left and right inclined surfaces 5B, 5C) is about 135 °, which is a large obtuse angle compared to 90 °. Therefore, the portions where the inclined surfaces 5B, 5C on the left and right sides of the hard tip 5 protrude from the tip surface 11A of the hard tip 11 become longer, and the cutting resistance in the cutting direction (main component force direction) increases.

  In other words, in the saw blade 1 having the configuration described in Patent Document 1, the average number of sawtooth polishing surfaces in one group is four, and the polishing cost is relatively high. In addition, the number of sharp corners and the number of obtuse angles in the saw blade are halved, and the cutting resistance tends to be large.

  As shown in FIG. 13, the saw blade 1 described in Patent Document 2 has a configuration in which a total of four teeth of a leading saw tooth 13 and first, second, and third succeeding saw teeth 15A, 15B, and 15C are provided as one group. The structures of the preceding sawtooth 13 and the first to third succeeding sawtooth 15A, 15B, and 15C are the same as those of the preceding sawtooth 9 in Patent Document 1 described above, and the polishing process has five surfaces. The corner angles on both sides of the tip of the leading saw blade 13 and the first to third succeeding saw blades 15A to 15C are all obtuse.

  In the above configuration, the chips generated when the workpiece is cut are divided into seven parts and subdivided. Therefore, although the subdivision of the chips is sufficient, as described above, the polishing process per tooth is five surfaces. Moreover, since the corner angles on both sides of the tip of all the saw teeth are obtuse, the polishing cost increases and the cutting resistance increases.

  Patent Document 3 describes a saw blade 1 configured as shown in FIG. The saw blade 1 shown in FIG. 14A has the same configuration as the saw blade 1 shown in Patent Document 1, and is between the leading saw blade 9 having a large tooth height and the succeeding saw blade 11 having a small tooth height. In this configuration, three saw teeth with a subsequent saw tooth 17 having an intermediate tooth height are provided as a group.

  In the above configuration, the corner angle on both sides of the tip of the leading saw blade 9 and the trailing saw blade 17 is an obtuse angle, and the number of corner angles on both sides is larger than that of the sharp saw blade 11, so that the cutting resistance is increased. In addition, since the number of polished surfaces of the preceding saw blade 9 and the subsequent saw blade 17 is 5 and the number of polished surfaces of the subsequent saw blade 11 is 3, the average per tooth in the group is [( 5 + 5 + 3) / 3], which is about 4.3 planes, which is 4 planes or more, and increases the polishing cost.

  Further, since the horizontal dimension of the portion where the hard tip in the preceding saw blade 9 and the subsequent saw teeth 11, 17 is joined to the body member 3 is the same as the thickness dimension of the body member 3, When grinding the side surface, the corner of the grindstone tends to come into contact with the drum member 3 and damage the grindstone, and contact damage due to the grindstone contact tends to be imparted to the drum member 3. There is a risk of stress concentration in the flaw and shortening the saw blade life. In addition, the appearance is impaired.

  In the configuration of the saw blade 1 shown in FIG. 14B, the leading saw blade 9 and the trailing saw blades 11 and 17 are both formed in a square shape, but the width dimension in the left-right direction of the leading saw blade 9 and the trailing saw blade 17 is It is smaller than the thickness dimension of the body member, and the bonding strength with the body member 3 is small, and it is easy to drop off due to cutting resistance. And the junction part of the subsequent sawtooth 11 and the trunk | drum member 3 is the same as the structure shown to Fig.14 (a), and has a problem as mentioned above.

  In Patent Document 4, a saw blade 1 shown in FIG. 15 is shown. That is, the saw blade 1 has a configuration including a leading saw tooth 9 having the same thickness as the body member 3 and first and second succeeding saw teeth 11 and 17. The preceding sawtooth 9 is a sawtooth having a large tooth height, and the first and second succeeding sawtooth 11 and 17 are sawtooth having a small tooth height and the same tooth height. Here, the first subsequent sawtooth 11 has a bee shape in which the width dimension on the front end side is increased, the second subsequent sawtooth 17 has a bee shape having the same tooth height dimension and a smaller width dimension on the front end side, and the first Since the cutting width is set to be the same as that of the subsequent saw-tooth 11, the second subsequent saw-tooth 17 hardly contributes to cutting.

  Therefore, the polishing process of the second subsequent sawtooth 17 is an extra polishing process, the polishing process cost is increased, and the thickness of the preceding sawtooth 9 is equal to the thickness of the body member 3, which is the same as in the case of Patent Document 3 described above. Have a problem.

  In Patent Document 5, a saw blade 1 as shown in FIG. 16 is shown. The saw blade 1 shown in FIG. 16A has a configuration in which the leading saw blade 9 and the trailing saw teeth 11 and 17 are provided as one group. In the above configuration, the thickness of the joining portion of the leading saw blade 9 and the trailing saw blade 17 is the same as the thickness of the body member 3, and there is a problem as described above, and the width dimension S of the cutting groove is set to each saw blade 9, 11,. 17, the leading sawtooth 9 has a dimension A, the trailing sawtooth 17 has a dimension 2B, and the trailing sawtooth 11 has a dimension 2C. Here, when the dimension A is compared with the dimensions 2B and 2C, A> 2B≈2C, and the cutting resistance of the leading saw blade 9 is larger than that of the trailing saw teeth 11 and 17. That is, there is a problem that the cutting load is not uniform and a high cutting rate cannot be expected.

  The saw blade 1 shown in FIG. 16 (b) has the same problem as the saw blade 1 shown in FIG. 16 (a), and has stepped portions on the left and right sides of the subsequent sawtooth 17, and has a curved surface on the stepped portion. By providing, there exists a problem that the grinding | polishing cost of this part becomes very large.

  As can be understood from the above description, in a saw blade provided with a hard tip at the tip of the saw tooth, it is normal that the balance between the polishing cost and the cutting performance, which are important in manufacturing cost, is not considered. . Therefore, the present invention is intended to provide a saw blade that can suppress the polishing processing cost and can improve the cutting performance.

The present invention has been made in view of the above-described problems, and has at least three types of saw blades: a leading saw blade having a large tooth height dimension, a first subsequent saw tooth having a middle tooth height dimension, and a second succeeding saw tooth having a small tooth height dimension. Each of the saw blades has a hard tip, and a saw blade having a smaller set height has a larger clam width, and the cutting width at which each of the saw blades acts on the workpiece is as follows: Ri substantially equally distributed to tare in order to substantially equalize the cutting load of each sawtooth, the serrations width as distal end side than the width of the joint portion of the hard tip against the trunk member of the saw blade is reduced The total number of portions in which the machining ridge line shows a straight line when viewed from the cutting direction perpendicular to the cutting direction of the saw blade with respect to the workpiece is the number of saw teeth in the one group. Divided average is 4 In order to reduce the length of the left and right side surfaces that contribute to cutting and prevent the cutting resistance from increasing, the corner angles on both sides of the tip portion of the saw blade that the width dimension becomes smaller toward the tip portion side. Is formed at an obtuse angle of 120 ° or less .

  In the saw blade, a width dimension of the joint portion of the hard tip with respect to the body member of the saw blade is larger than a thickness dimension of the body member and not more than twice a thickness of the body member. It is what.

  Further, in the saw blade, the width dimension of the joint portion of the hard chip is 105% to 180% of the thickness dimension of the body member.

  In the saw blade, the width of the cutting width by the second subsequent sawtooth is not more than twice the thickness of the body member of the saw blade.

  Further, in the saw blade, at least one of the hard tips provided in the preceding saw blade and the first subsequent saw blade has a shape in which the width dimension on the tip side is gradually smaller than the width dimension of the joint portion with the body member in the saw blade. It is characterized by being.

  In the saw blade, a difference in tooth height between the preceding saw blade and the first subsequent saw blade is equal to a difference in tooth height between the first subsequent saw blade and the second subsequent saw blade. .

  According to the present invention, when the workpiece is cut by the saw blade, the cutting loads acting on each of the leading saw blade, the first and second succeeding saw blades provided on the saw blade are substantially equal, and chips generated during cutting Can be subdivided and the wear of each sawtooth can be equalized. Further, the number of polished surfaces per tooth of one group can be suppressed to less than 4, and the polishing cost can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, and the same reference numerals are given to components having the same functions as those of the saw blade in the state described above, and redundant description will be omitted.

  Referring to FIG. 1, a saw blade 1 according to an embodiment of the present invention includes a body member 3, and the body member 3 has a leading saw tooth 9 having a large tooth height from a reference position and a tooth height dimension. Are provided with a group of three teeth, that is, an intermediate first succeeding sawtooth 19 and a second succeeding sawtooth 21 having a small tooth height dimension. By the way, since the preceding sawtooth 9 has a large tooth height dimension, it is sometimes referred to as an H tooth, the first succeeding sawtooth 19 is an intermediate height, so that it is an M tooth, and the second succeeding sawtooth 21 is a low tooth.

  Hard tips 23, 25, and 27 are attached to the leading end portions of the preceding sawtooth (H tooth) 9, the first succeeding sawtooth (M tooth) 19, and the second succeeding sawtooth (L tooth) 21, as in the prior art. . The thickness dimension of the hard chip 23 in the H tooth, the hard chip 25 in the M tooth 19 and the hard chip 27 in the L tooth 21 connected to the body member 3 of the saw blade 1 (width dimension in the left-right direction in FIG. 2) W is larger than the thickness dimension T of the body member 3 and slightly protrudes outward from the side surface in the thickness direction (left and right direction in FIG. 2) of the body member 3. , 25 and 27 are stepped.

  As shown in FIG. 2, which is an enlarged view of FIG. 1C, the shape of the hard tip 23 viewed from the cutting direction (main component force direction) of the saw blade 1 is the width dimension (thickness dimension) on the tip side. ) Are gradually reduced to a trapezoidal shape, and the polished surfaces that form the straight ridge lines are the front end surface 23A and the left and right side surfaces 23B, 23C (the scuff surface is omitted). The corner angle α on both sides of the tip of the hard chip 23 is set in a range of 108 ° ± 10 °, and even an obtuse angle is 120 ° or less, which is a conventional general corner angle. It is considerably smaller than the angle (about 135 °), and the length of the left and right side surfaces 23B and 23C contributing to cutting is shortened to prevent the cutting resistance from increasing.

  As shown in FIG. 2, the M-shaped hard tip 25 is formed in a trapezoidal shape in which the thickness dimension (width dimension) on the tip side gradually decreases. The tooth height dimension h2 from the reference position of the hard tip 25 is smaller than the tooth height dimension h1 of the hard tip 23. Then, the polished surface that forms a linear ridge line in the hard tip 23 is three surfaces of the front end surface 25A and the left and right side surfaces 25B, 25C, and the width dimension of the front end surface 25A in the left-right direction in FIG. The hard chip 23 is formed larger than the width dimension of the front end surface 23A.

  The corner angle β on both sides of the tip of the hard chip 25 is 96 ° ± 10 °, and even if it is an obtuse angle, it is 110 ° or less, and the left and right side surfaces 25B and 25C contribute to the cutting. The cutting length is further shortened to reduce the cutting resistance.

  As shown in FIG. 2, the hard tip 27 in the L tooth is formed in a trapezoidal shape in which the thickness dimension (width dimension) on the tip side gradually increases. The tooth height dimension h3 from the reference position of the hard tip 27 is the smallest. In this hard tip 27, the polishing surface that forms a straight ridge line is the tip surface 27A, and the left and right side surfaces 27B and 27C. The width of the tip surface 27A is the width of the tip surface 25A of the hard tip 25. It is formed larger. The corner angle γ on both sides of the tip of the hard tip 27 is 80 ° ± 10 °. That is, an acute angle of 90 ° or less is set.

  The width dimension S of the distal end surface 27A of the L-tooth hard tip 27 is equal to the width dimension of the cutting groove formed when the workpiece is cut by the saw blade 1. And in order to make the cutting load (cutting resistance) of each of the hard tips 23, 25, 27 substantially equal, the width dimension A that the hard tip 23 contributes to cutting, and the width dimension 2B that the hard tip 25 contributes to cutting, The relationship with the width dimension 2C that the hard tip 27 contributes to cutting is A≈2B≈2C. The difference in tooth height between the hard tip 23 and the hard tip 25 (h1-h2) is set equal to the difference in tooth height between the hard tip 25 and the hard tip 27 (h2-h3).

  Accordingly, when the workpiece is cut by the saw blade 1, the H-tooth hard tip 23 is cut into the workpiece first, and then the M-tooth hard tip 25 is cut into the workpiece. Then, an L-toothed hard tip 27 cuts into the workpiece, and the chips generated at that time have a width dimension corresponding to the dimensions A, B, B, C, and C and a thickness t as shown in FIG. This will produce equal chips 29A, 29B, 29C. That is, the cutting contribution ratio of each of the hard chips 23, 25, and 27 is substantially equal, and the chips are divided into five by an efficient and uniform function.

  Note that the difference between the minimum width and the maximum width in the dimension A≈2B≈2C is preferably within 30%, and more preferably within 15%. That is, when the difference is 30% or more, the balance of chip resistance of each of the hard chips 23, 25, 27 is deteriorated, and wear of the hard chip having a large chip resistance is promoted as compared with a hard chip having a small cutting resistance. , Local wear is likely to occur. When the difference is within 15%, each of the hard chips 23, 25, 27 is worn almost evenly, and the life of the saw blade 1 can be extended.

  As already understood, the chip 29 generated when the workpiece is cut is divided into 29A, 29B, 29B, 29C, and 29C, so that the cutting resistance can be distributed to each of the hard chips 23, 25, and 27. The cutting resistance of the hard tips 23, 25, 27 can be reduced. And even if the corner angles on both sides of the tips of the hard chips 23 and 25 are obtuse, they are 120 ° or less and 110 ° or less, respectively. The cutting force can be suppressed smaller than that of the blade, and the workpiece can be cut at a high cutting rate.

  Further, since each of the hard chips 23, 25, and 27 has three polishing surfaces that form a straight ridge line, the average value of the group is 3, which is less than 4, so that the polishing cost is suppressed. It is something that can be done.

  Further, in the above-described configuration, the H-tooth and M-tooth hard tips 23 and 25 are formed in a trapezoidal shape in which the width dimension (thickness dimension) on the tip side is gradually reduced. 23C: 25B and 25C are inclined so that the connecting portion side with the body member 3 is separated from the body member 3. Therefore, when polishing the side surfaces 23B, 23C: 25B, 25C, the grindstone is inclined so as to be separated from the barrel member 3, and does not give polishing scratches or the like to the barrel member 3. .

  And the width dimension (thickness dimension) W of the connection part with respect to the trunk | drum member 3 of each hard chip | tip 23,25,27 is larger than the thickness dimension T of the trunk | drum member 3, and is the range of 105%-180% of the said dimension T. Desirably, it is preferably set in the range of 105% to 140%.

  That is, since the L-shaped hard chip 27 is formed in a trapezoidal shape in which the width dimension (thickness dimension) on the joint portion side with the body member 3 is reduced, the right and left side surfaces 27B and 27C are polished. The grindstone is inclined so as to be close to the body member 3. Therefore, if the dimension W is set to 105% or less of the thickness T of the body member 3, the grindstone may come into contact with the body member 3, which is not desirable. When the dimension W is 180% or more of the thickness dimension T, when the width dimension S of the distal end surface 27A of the hard tip 27 is twice the thickness dimension T, the corner angle γ is increased and the cutting resistance is increased. It is not desirable because it grows.

  By the way, when a workpiece is cut by the saw blade 1, if a cutting groove is formed in the workpiece, the internal stress of the workpiece is released, the cutting groove becomes narrow, and the saw blade 1 may be sandwiched. Therefore, it is desirable that the width dimension S of the distal end surface 27 </ b> A of the hard chip 27 is larger than the thickness dimension T of the body member 3. However, since the cutting resistance increases when the width dimension S is increased, it is desirable that W <S ≦ 2T. More preferably, W <S ≦ 1.7T.

  That is, when 1.7T <S ≦ 2T, the height and width of the hard tip tend to increase, and the polishing cost of the hard tip tends to increase. In other words, by setting W <S ≦ 1.7T, it is possible to suppress the saw blade 1 from being sandwiched by releasing the internal stress and to reduce the polishing cost.

  FIG. 3 and FIG. 4 show the second embodiment, and the same reference numerals are given to the constituent elements having the same functions as those of the above-described embodiment, and a duplicate description is omitted.

  In this embodiment, left and right inclined surfaces 23D and 23E are provided on the hard tip 23 of the H tooth, and the same shape as the preceding saw tooth 13 described in Patent Document 2 is used. In this case, although the cutting resistance of the hard tip 23 is increased, the entire cutting resistance can be suppressed small, and a high cutting rate can be maintained. And in the said structure, the grinding | polishing process surface which forms a linear ridgeline in the hard chip | tip 23 in H tooth is five surfaces 23A-23E, and the grinding | polishing process surface in the hard chips 25 and 27 in M tooth and L tooth Since each has three surfaces, the average per tooth in one group is (5 + 3 + 3) /3≈3.7, and since it is less than four surfaces, the polishing cost can be reduced more than before. The same effects as those of the embodiment described above can be obtained.

  In the above configuration, the left and right inclined surfaces 23D and 23E are provided on the hard tip 23 of the H tooth, but the right and left inclined surfaces may be provided on the hard tip of the M tooth instead of the H tooth. it can.

  5 and 6 show a third embodiment. In this embodiment, the arrangement positions of the M teeth and the L teeth in the second embodiment are converted, and other configurations are shown. Are the same as those in the above-described embodiment, and the same reference numerals are given to components having the same functions, and redundant description is omitted. Thus, even if the arrangement of the M teeth and the L teeth is changed, there is no significant change in the overall configuration, and the same effects as those of the above-described embodiment can be obtained.

  FIGS. 7 and 8 show the fourth embodiment. In the configuration of the first embodiment described above, the number of teeth of one group is determined by making the number of subsequent saw teeth of intermediate tooth height dimensions M1 and M2. 4 teeth. In this configuration, the corner angles α, β, γ, and δ on both sides of the hard tip end of the H tooth, M1 tooth, M2 tooth, and L tooth are respectively set to α = 110 ° ± 10 ° and β = 102 °. ± 10 °, γ = 92 ° ± 10 ° δ = 80 ° ± 10 °. The difference in tooth height is set to h1-h2≈h2-h3≈h3-h4.

  In the above configuration, since the number of M teeth is increased by one in the configuration of the first embodiment, the same effect as in the first embodiment can be obtained, and chips generated during cutting are divided into seven parts Thus, the cutting resistance of each hard tip can be further reduced. That is, by increasing the number of teeth in a configuration in which three teeth of H teeth, M teeth, and L teeth are made into one group, the cutting resistance is distributed to each, so that the cutting resistance of each tooth can be suppressed to be small. In addition, it is possible to subdivide the chips.

  FIG. 9 and FIG. 10 show the fifth embodiment. Since the H tooth in the fourth embodiment is replaced with the H tooth in the second embodiment, it is the same as the above embodiment. It can be effective. In this embodiment, there are 5 polished surfaces for H teeth and 3 for M1, M2, and L teeth, so the average per tooth in the group is 3.5 and less than 4 surfaces. Therefore, the polishing cost can be reduced more than before.

  By the way, the thickness of the body member 3 in the saw blade is T, the width dimension of the hard chip 27 on the connection side of the L tooth is W, the width dimension of the tip side is S, the height dimension of the hard chip 27 is K, and the side band. When the ratio of the width dimension W of the hard tip of the joint portion to the thickness T of the body member 3 is examined with the actual dimensions, where α is the width direction angle and b is the protrusion amount of the joint portion, the table is shown as a table shown in FIG. . As is apparent from this table, the minimum value of W / T is 106.8% and the maximum value is 178.8%. In the case of a standard set width, the maximum value when K = 2 mm is 138.8%.

  Therefore, it can be seen that W / T is 105% or more and 180% or less, and 140% or less is desirable in the case of a standard set width.

  As can be understood from the above description, the average number of polishing surfaces that form a straight ridge line is 4 per tooth in a group, with a saw blade having three polishing surfaces as the main saw blade. Since the configuration is less than the above, the shape of the saw blade is easy to polish, the polishing accuracy is easily obtained, and the polishing cost can be suppressed.

  Since the cutting widths of the H teeth, M teeth, and L teeth that act on the workpiece are evenly distributed in order to make the cutting load substantially uniform, the wear of each saw blade progresses evenly. Yes, it is possible to suppress local wear.

It is explanatory drawing which showed schematically and conceptually the saw blade which concerns on 1st Embodiment of this invention. It is an enlarged view of the principal part of FIG.1 (c). It is explanatory drawing which showed schematically and conceptually the saw blade concerning 2nd Embodiment of this invention. It is an enlarged view of the principal part of FIG.3 (c). It is explanatory drawing which showed schematically and conceptually the saw blade which concerns on 3rd Embodiment of this invention. It is an enlarged view of the principal part of FIG.5 (c). It is explanatory drawing which showed schematically and conceptually the saw blade concerning 4th Embodiment of this invention. It is an enlarged view of the principal part of FIG.7 (c). It is explanatory drawing which showed schematically and conceptually the saw blade concerning 5th Embodiment of this invention. It is an enlarged view of the principal part of FIG.9 (c). It is explanatory drawing which tabulated the ratio examination of the width dimension W of a hard chip | tip, and the thickness T of a trunk | drum member. It is description of the saw blade of patent document 1. FIG. It is description of the saw blade of patent document 2. FIG. It is description of the saw blade of patent document 3. FIG. It is description of the saw blade of patent document 4. FIG. It is description of the saw blade of patent document 5. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Saw blade 3 Body member 5,7 Hard tip 9 Leading saw blade (H tooth)
19 1st subsequent sawtooth (M tooth)
21 Second subsequent sawtooth (L tooth)
23, 25, 27 Hard tip

Claims (6)

A group of at least three types of saw blades, a leading saw blade having a large tooth height, a first trailing saw tooth having a middle tooth height and a second trailing saw tooth having a small tooth height, each of which has a hard tip, In addition, a saw blade having a smaller set height as the tooth height is smaller, and the cutting width at which each of the saw teeth acts on the workpiece is approximately equal in order to make the cutting load at each saw tooth substantially equal. distribution tare is, the width dimension the more distal end side than the width of the joint portion of the hard tip against the trunk member of the saw blade comprises a saw tooth becomes smaller, perpendicular to the cutting direction of the saw blade against the workpiece The average value obtained by dividing the total number of portions where the machining ridge line shows a straight line when viewed from the cutting direction by the number of saw teeth in one group is less than 4, and the left and right side surfaces are cut. Length contributing to To prevent the short to cutting resistance is increased, characterized in that the angle of the sides of the corner angle of the tip portion of the saw teeth width as front end portion becomes smaller is formed on the obtuse angle of 120 ° or less A saw blade. 2. The saw blade according to claim 1, wherein a width dimension of the joint portion of the hard tip with respect to the body member of the saw blade is larger than a thickness dimension of the body member and not more than twice a thickness of the body member. A saw blade characterized by that . 3. The saw blade according to claim 2, wherein a width dimension of a joint portion of the hard chip is 105% to 180% of a thickness dimension of the body member . The saw blade according to any one of claims 1 to 3, wherein a cutting width of the second subsequent saw tooth is not more than twice a thickness of a body member of the saw blade. . The saw blade according to any one of claims 1 to 4, wherein at least one of the hard tip provided in the preceding sawtooth and the first subsequent sawtooth is closer to a tip side than a width dimension of a joint portion of the saw blade with a body member. A saw blade having a shape in which the width dimension is gradually reduced . The saw blade according to any one of claims 1 to 5, wherein a difference in tooth height between the preceding sawtooth and the first subsequent sawtooth is equal to a difference in tooth height between the first subsequent sawtooth and the second subsequent sawtooth. A saw blade characterized by that .

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