JP2010046736A - Band saw blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a band saw blade capable of reducing a deformation amount of inward deformation of right and left saw-setting sawteeth due to lateral component force working in cutting a workpiece. <P>SOLUTION: The band saw blade has a straight sawtooth 5, and right and left saw-setting sawteeth 7A and 7B; 9A and 9B, and it also has a gullet 11 between the respective sawteeth. A chip curler 15 for curling a spirally rolling swarf occurring in cutting the workpiece is provided on a rake face 13 on each sawtooth. A reinforcing part is provided, which has a length extending toward a saw base on a flank 19 of the right and left saw-setting sawteeth formed to be longer than a length of the straight sawtooth 5 extending toward the saw base of the flank and protruding toward a subsequent sawtooth adjacent to the flank 19 of the right and left saw-setting sawteeth. A position 23 of bending the saw-setting sawteeth is provided on the reinforcing part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a band saw blade having a plurality of saw teeth of straight teeth and left and right set teeth, and more specifically, the set teeth according to a lateral force acting on the left and right set teeth when a workpiece is cut (cut). It is related with the band saw blade which can suppress that the width | variety of the cutting groove cut | disconnected to the workpiece | work becomes small by deform | transforming inward.

  When cutting (cutting) a large metal workpiece, a band saw machine having a band saw blade is used. The band saw blade is configured to include a plurality of saw teeth of straight teeth and left and right set teeth. When cutting a workpiece with a band saw blade, in order to improve the discharge performance of chips generated by cutting, a band saw blade having a tip curler portion for spirally winding the chips on the squirrel surface of each saw tooth is provided. It has been developed (see, for example, Patent Documents 1, 2, 3, and 4).

By the way, the set bending position of the left and right set teeth in the band saw blade provided with the left and right set teeth is a fixed distance from the back portion or the reference position of the band saw blade by the method of manufacturing the band saw blade (see Patent Document 5).
JP-A-6-716 JP 2005-349512 A Japanese Patent No. 3870158 JP 2003-334721 A JP-A-11-19822

  In Patent Documents 1 to 4, although there is a description regarding the shape of the saw blade, there is no description regarding the position of the set bending when the left and right set teeth are set out and the length of the set bending line. The band saw blade described in Patent Document 5 describes that the set bending positions of the left and right set teeth are the same height position, and the lengths of the set bending lines are all equal.

  When the workpiece is cut by the conventional band saw blade as described above, a cutting groove having a width corresponding to the set width (claw swinging amount) of the left and right set teeth provided in the band saw blade is formed in the workpiece. However, when the workpiece is cut (cut), the left and right set teeth act on the left and right set teeth, so the left and right set teeth are deformed inward, and the width dimension of the cutting groove may be smaller than the specified value. In addition, the internal stress of the workpiece is released by cutting, the width dimension of the cutting groove is reduced, and in some cases, a narrowing phenomenon in which the band saw blade is sandwiched may occur, and the band saw blade may not move.

  The present invention has been made in view of the above-described problems, and is a band saw blade provided with a plurality of saw teeth of straight teeth and left and right set teeth, and a galette portion between the saw teeth. A tip curler portion for spirally winding chips generated during workpiece cutting on the squeeze surface of the squirrel surface, the length of the flank surface of the left and right set teeth to the base side is set to the length of the flank surface of the straight tooth. It is formed longer than the length to the tooth base side, and includes a reinforcing portion projecting to the adjacent subsequent saw tooth side on the flank face of the left and right set teeth, and this reinforcing portion has a set bending position of the left and right set teeth. It is characterized by being provided in.

  Further, in the band saw blade, the set bending positions of the left and right set teeth are the same height position, and the length of the set bending line of the left and right set teeth is the equivalent width of the straight set file bending line at the same height position. It is characterized by being larger than the dimension.

  Further, in the band saw blade, a concave portion is provided between the tip curler portion and the bottom portion of the galette portion, which is recessed on the side opposite to the tip curler portion in the traveling direction of the band saw blade, and The bottom portion is connected by an arc-shaped portion having a large curvature radius.

  Further, in the band saw blade, a set tooth bending line of a set tooth having a large set amount of left and right set teeth is longer than a set bending line of a set tooth having a small set amount.

  According to the present invention, since the chip curler portion is provided on the squirrel surface of each saw tooth, a mode in which the squeeze surface protrudes toward the adjacent preceding tooth side with respect to the saw tooth not provided with the chip curler portion. It becomes. Furthermore, in the flank, it becomes the aspect provided with the reinforcement part which formed the length to the tooth root side of the flank long, or protruded to the adjacent subsequent sawtooth side. Therefore, since the set bending positions of the left and right set teeth are provided at these positions, the set bend line length becomes longer than before, and the resistance against the left and right component forces acting on the set teeth is right and left. growing. Therefore, it is possible to suppress inward deformation of the left and right set teeth due to the component force in the left and right direction, and it is possible to suppress the reduction of the width dimension of the cutting groove when cutting the workpiece. Can be eliminated.

  Referring to FIG. 1, a band saw blade 1 according to a first embodiment of the present invention includes a band-shaped body portion 3 like a general band saw blade. A plurality of saw teeth of straight teeth 5, left and right set teeth 7A, 7B; 9A, 9B are provided at intervals of appropriate pitches P1 to P5. A galette portion 11 is provided between each of the saw blades. The pitches P1 to P5 may be the same pitch or different pitches, and can be set as desired. Referring to FIG. 2, the sum of the squeeze angle θ, the tooth angle β, and the clearance angle α in each of the saw teeth is 90 °, and the squeeze angle is configured to have both a cutting resistance reduction effect and wear resistance. θ and tooth angle β are set to 10 ° ≦ θ and 40 ° ≦ β. The squeeze surface 13 of each saw tooth is provided with an arcuate chip curler portion 15 for spirally winding chips generated continuously when a workpiece (not shown) is cut (cut).

  The radius r of the tip curler portion 15 is set to 10% ± 0.5 mm of the pitch P including the gallet portion 11 on the front side (right side in FIG. 1) of the tip curler portion 15. That is, for example, the radius r of the chip curler portion 15 in the case of the sawtooth 9A forming the galette portion 11 with the pitch P1 is (P1 × 0.1) ± 0.5 mm, and similarly in the case of the sawtooth 7A ( P2 × 0.1) ± 0.5 mm. Therefore, the radius r of the chip curler portion 15 becomes larger as the dimension of the pitch P becomes larger. By setting in this way, the radius r can be set to an appropriate radius r corresponding to various dimensions of the pitch P. is there.

  In order to set the radius r of the chip curler portion 15, it is also possible to use an average value of the pitches Pt of all the saw teeth included in one group. Thus, since the radius of the chip curler part 15 in each sawtooth becomes equal by using the average value of all the pitches Pt, even if each pitch P1-P5 is different, formation of the chip curler part 15 is easier. It will be.

  The fan angle γ of the chip curler portion 15, that is, the connecting portion 15 A between the squeeze surface 13 and the arc of the chip curler portion 15, the rear side concave curved surface portion (concave curve portion) 17 and the chip curler portion 15 in the galette portion 11. The angle including the arc between the arc 15 and the intersection 15B is set to 90 ° ± 25 °. That is, the arc of the tip curler portion 15 is formed as an arc of about ¼ circle of the radius r. The position of the intersection 15B is a position where the height dimension h from the tooth tip T of each saw tooth to the intersection 15B satisfies the condition of (2r × 1.1) ± (2r × 1.1) × 0.2. It is.

  By the way, the chips generated when the workpiece is cut by the saw blade reach the chip curler portion 15 along the squeeze surface 13 of the saw blade, and are wound around the chip at the arc portion formed by the radius r of the chip curler portion 15 and the fan angle γ. A wrinkle is given and it is wound spirally. Here, when the dimension h is smaller than [(2r × 1.1) − (2r × 1.1) × 0.2], the chip curler portion 15 is clogged without the chips being spirally wound. Sometimes. Moreover, when it becomes larger than [(2r × 1.1) + (2r × 1.1) × 0.2], the temperature of the chips decreases until the chips reach the chip curler portion 15, and curling occurs. It becomes difficult. Therefore, it is desirable to set the dimension h in the range of [(2r × 1.1) ± (2r × 1.1) × 0.2].

  When the radius r of the chip curler portion 15 is smaller than (P × 0.1-0.5), the radius r and the dimension h corresponding thereto are smaller than the chip length corresponding to the pitch, so that chips are generated. There is a problem that clogging occurs, and when it becomes larger than (P × 0.1 + 0.5), the dimension h corresponding to the radius r becomes large, so that sufficient curl is applied to the chips. The chip curler has a problem that the temperature drops to a low temperature, the curl is not sufficiently wound, and long and elongated chips are generated, and the chips are sandwiched between the grooves and the body of the saw blade, causing irregularities on the cut surface. It is desirable that the radius r of the portion 15 is set in the range of (P × 0.1 ± 0.5).

  The fan angle γ of the chip curler portion 15 is set to 90 ° ± 25 °. That is, the chips scraped off by the tooth tip of the saw blade during the cutting of the workpiece continuously flow along the squeeze surface 13 to the chip curler portion 15, and the chip curler portion 15 has a relationship of radius r and fan angle γ. The curvature of the tip portion where the is wound spirally is determined. Here, when the fan angle γ is smaller than (90 ° −25 °), there is a problem that sufficient curl cannot be imparted and unevenness is generated on the cut surface, and when larger than (90 ° + 25 °), It is desirable to set the fan angle γ within the range of 90 ° ± 25 ° because there is a problem that the chips are contained only in the fan shape and as a result, the effective galette becomes small and becomes clogged. .

  As will be understood from the above description, in order to compactly curl the chips generated when the workpiece is cut by the band saw blade 1, it corresponds to the size of the pitch (or average pitch) P of the tooth tip in the saw blade. It is desirable to set the radius r and the fan angle γ of the tip curler portion 15 and to set the height dimension h of the tooth tip corresponding to the radius r.

  As described above, by providing the chip curler portion 15 on the saw blade, the squeeze surface 13 has a protruding portion that protrudes toward the adjacent preceding tooth (the saw blade positioned on the front side in the traveling direction of the band saw blade 1). The width dimension of the saw blade (width dimension in the same direction as the traveling direction of the band saw blade 1) is larger than a normal saw blade (for example, a saw tooth indicated by a concave curve of an imaginary line 17A) that does not include the tip curler portion 15. .

  The flank 19 of each of the saw teeth is formed as an inclined surface inclined at the same flank angle α from the tooth tip T over a desired range, and a height from the tooth tip T of the end 19A of the flank 19 is high. The dimension is set smaller than the dimension h.

  The dimension E in the traveling direction (traveling direction) of the band saw blade 1 from the tooth tip T to the end 19A of the flank 19 is set to the left and right set teeth 9A, 7A rather than the dimension E0 of the straight tooth 5. , 9B, and 7B have large dimensions E1 to E4.

  That is, as a configuration in which the second flank 21 continuous to the rear side (left side in FIG. 1) of the flank 19 is arranged on the rear side of the sawtooth, the width dimensions of the left and right set teeth 7A, 7B; It is set larger than the width dimension of the straight tooth 5. As already understood, as the dimension E in the traveling direction of the band saw blade 1 of the flank 19 is increased, the end 19A is located further rearward from the tooth tip T, and the width of the saw tooth is increased. is there.

  In other words, when the relief angles α of the respective saw teeth are equal, the length from the tooth tip T to the end portion 19A of the relief surface 19 is formed longer, that is, the length from the tooth tip T to the root side. As a result, the second flank 21 is separated from the tip curler portion 15, and the width of the sawtooth (the width in the traveling direction of the band saw blade 1, the width in the left-right direction in FIG. 2) increases. is there.

  As described above, increasing the dimensions E1 to E4 of the left and right set teeth 7A and 7B; 9A and 9B rather than the dimension E0 of the straight tooth 5 causes the region Q indicated by hatching in FIG. The reinforcement part which protruded in the back direction of the surface 19 is comprised.

  The set bending position 23 of the left and right set teeth 7A, 7B; 9A, 9B is a fixed height position from a reference position such as the back portion of the band saw blade 1, for example, and the intersection 15B and the gallet portion in the tip curler portion 15 11 is set at a position close to the intersection 15B with the bottom 11B. And the set bending line 25 which performed the settling out at the set bending position 23 is formed in parallel with the traveling direction (traveling direction) of the band saw blade 1.

  As already understood, the width dimensions (claw bend line lengths) S1 to S4 of the left and right set teeth 7A, 7B; 9A, 9B at the set bending position 23 correspond to the set bending position 23 in the straight tooth 5. It is larger than the width dimension at the height position (the width dimension corresponding to the set bending line) S0. Since the left and right set teeth 7A, 7B; 9A, 9B have the same settling amount Ln, Rn in the left and right direction, the width dimensions of the left and right set teeth 7A, 7B; 9A, 9B at the set bending position 23 are the same. Are set equal.

  As will be understood from the above description, each saw tooth in the band saw blade 1 according to the present embodiment is provided with the tip curler portion 15 on the squeeze surface 13 so that the traveling direction of the band saw blade 1 is adjacent to the squeeze surface 13. The width dimension in the front direction (preceding tooth direction) is increased as a form having a protruding portion protruding in the preceding tooth direction preceding (traveling direction), and the dimension E in the traveling direction of the flank 19 in each saw tooth is set. The overall width dimension of the sawtooth is increased by increasing the width dimension in the rear direction (following tooth direction). Then, since the set bending position 23 is set in the large width portion and the set teeth of the left and right set teeth 7A and 7B; 9A and 9B are moved out, the length of the set bending line 25 in the set teeth on the left and right is set to be conventional. It can be made longer than the set bending line of the set teeth in a general band saw blade.

  Therefore, the rigidity with respect to the lateral component force acting on the left and right set teeth 7A, 7B; 9A, 9B is improved when the workpiece is cut, and the amount of deformation of the set teeth deformed inward by the lateral component force is further reduced. It can be suppressed. Therefore, it can suppress that the width dimension of the cutting groove formed in the workpiece | work at the time of cutting of a workpiece | work becomes smaller than the width dimension prescribed | regulated by the amount of clashes of the left and right set teeth. Therefore, it is possible to prevent the narrowing of the cutting groove and cause a narrowing phenomenon, and to solve the conventional problems as described above.

  By the way, in the above description, in the configuration in which the squeeze surface 13 is provided with the tip curler portion 15, the width dimension of the saw blade is increased by increasing the dimension E in the running direction of the flank 19 but as shown in FIG. Further, it is also possible to adopt a configuration in which the flank 19 is provided with a reinforcing portion 27 protruding rearward, that is, adjacent to the adjacent sawtooth side (left side in FIG. 3). By setting it as the said structure, the length SB of the set bending line when the reinforcement part 27 is provided can be made longer than the length SA of the set bending line when the reinforcing part 27 is not provided.

  As described above, in the configuration in which the reinforcing portion 27 is provided on the flank 19 of the saw blade, the reinforcing portion 27 is provided rather than the radius of curvature RA of the bottom portion 11B of the galette portion 11 when the reinforcing portion 27 is not provided. The radius of curvature RB of the bottom part 11B of the galette part 11 is reduced. However, in this case, as shown in FIG. 4, the traveling direction of the band saw blade 1 (running direction: figure) is greater than the intersection 15B of the tip curler portion 15 between the tip curler portion 15 and the bottom portion 11B of the galette portion 11. 4 to the opposite side (in the right direction in FIG. 4), and by connecting the recess 29 and the bottom 11B of the galette part 11 with an arcuate part 31, the radius of curvature RC of the arcuate part 31 is obtained. It can be made larger than the curvature radius RB.

  Therefore, by providing the concave portion 29, the radius of curvature RC of the bottom portion 11B of the galette portion 11 can be increased, the stress concentration at the bottom portion 11B of the galette portion 11 can be relieved, and the trunk fracture due to the trunk fatigue life of the band saw blade 1 Can be suppressed.

  In addition, when providing the reinforcement part 27 in the flank 19 of a sawtooth, the shape of the reinforcement part 27 can be made into various forms. For example, as shown in FIG. 5, it is also possible to have a configuration that protrudes rearward from the flank 19. That is, by providing the concave portion 29, the reinforcing portion 27 can be configured to protrude rearward with various shapes.

  FIG. 6 shows a band saw blade 1A according to the second embodiment of the present invention. In the band saw blade 1A, the tooth height dimension (height position of the tooth tip T) of the straight teeth 5, the left set teeth 7A, and the right set teeth 9B is equal, and the tooth heights of the right set teeth 9A and the left set teeth 7B are the same. Although the dimensions are equal, the tooth height dimensions of the left and right set teeth 7B and 9A are smaller than the tooth height dimensions of the straight teeth 5 and the like. The left and right set teeth 7B and 9A with small tooth height dimensions are set to be larger than the right and left set teeth 7A and 9B with larger tooth height dimensions Ln1 and Rn2. It is.

  Further, in the band saw blade 1A, there is a gap between the set tooth bending line equivalent width dimension S0 of the straight tooth 5 and the set bending line lengths S1, S2, S3, S4 of the left and right set teeth 9A, 7A, 9B, 7B. , S0 <S2 = S3 <S1 = S4. That is, the clam bend line lengths S1 and S4 of the set teeth 9A and 7B having large set amount Rw1 and Rw2 are larger than the set bend line lengths S2 and S3 of the set teeth 7A and 9B having small set amounts Ln1 and Rn2. It is provided. In other words, the set teeth with a larger amount of set-up swing increase the set-up bending line length to increase the rigidity against the component force in the left-right direction, thereby suppressing inward deformation.

  Therefore, even in the band saw blade in which the cutting force is distributed by increasing the settling amount of the left and right set teeth with a small tooth height larger than the set size of the set teeth with a large tooth height size, the cutting groove is not formed. The narrowing can be prevented, and the same effect as the above-described band saw blade can be obtained.

  FIGS. 7 and 8 show the case where the saw blade having the shape shown in FIG. 4 and the saw blade having a similar shape are applied to the saw blade in the band saw blade shown in FIG. 6, and only the shape of the saw blade is different. Detailed description is omitted.

  FIG. 9 shows the dimensions of each part when the band saw blade 1 having the configuration shown in FIG. 1 is actually manufactured.

  As understood from the above description, in the band saw blade 1 according to the present embodiment, the left and right set teeth 7A, 7B; 9A, 9B are provided with the tip curler portion 15 on the squeeze surface 13 and each set tooth 7A. , 7B; 9A, 9B are formed with reinforcing portions protruding rearward on the flank 19 so that the width of the left and right set teeth 7A, 7B; 9A, 9B is the same as that of the prior art without the tip curler portion and the reinforcing portion. Since the width dimension is made larger than that of the general left and right set teeth, the set bend line lengths of the left and right set teeth 7A and 7B; 9A and 9B can be made larger, and the left and right direction when cutting the workpiece Thus, the rigidity against the component force can be increased, and the conventional problems as described above can be solved.

It is explanatory drawing which shows the structure of the band saw blade which concerns on embodiment of this invention. It is detail explanatory drawing of the sawtooth in the said band saw blade. It is explanatory drawing which shows another form of a sawtooth. It is explanatory drawing which shows another form of a sawtooth. It is explanatory drawing which shows another form of a sawtooth. It is explanatory drawing which shows 2nd Embodiment of a band saw blade. It is explanatory drawing which shows 3rd Embodiment of a band saw blade. It is explanatory drawing which shows 4th Embodiment of a band saw blade. It is explanatory drawing which shows the dimension of each part of an actual band saw blade.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Band saw blade 3 Body part 5 Straight tooth 7A, 7B Left set teeth 9A, 9B Right set teeth 11 Galette part 11B Bottom part 13 Squee face 15 Chip curler part 15A Connection part 15B Intersection point 17, 17A Back side concave curved surface part (concave curve part) )
19 flank 19A end 21 second flank 23 clam bending position 25 clam bending line 27 reinforcing part 29 concave part 31 arcuate part T tooth tip

Claims (4)

  A band saw blade having a plurality of saw teeth of straight teeth and left and right set teeth, and a galette portion between the saw teeth, and spirally cutting chips generated during workpiece cutting on the squeeze surface of each saw tooth A tip curler portion for winding the left and right set teeth, and the length of the flank face of the left and right set teeth is longer than the length of the flank face of the straight tooth to the heel side. A band saw blade comprising a reinforcing portion projecting toward the adjacent subsequent saw-tooth side on a tooth flank, and a set-up bending position of the left and right set teeth is provided in the reinforcing portion.   2. The band saw blade according to claim 1, wherein the set bending positions of the left and right set teeth are the same height position, and the length of the set bend line of the left and right set teeth is the straight set bending position at the same height position. Band saw blade characterized by being larger than the line equivalent width dimension.   The band saw blade according to claim 1, further comprising a recess recessed between the tip curler portion and the bottom of the galette portion on the opposite side of the tip saw curler portion in the traveling direction of the band saw blade. A band saw blade characterized in that a bottom portion of a galette portion is connected by an arc-shaped portion having a large curvature radius.   The band saw blade according to claim 1, 2 or 3, characterized in that the set-up bending line of the set teeth with the large set-up amount of the left and right set teeth is longer than the set-up bending line of the set-up teeth with a small set-up amount. Band saw blade to do.

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