JP2006247831A - Tooth of saw for cutting metal and saw for cutting metal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a saw for cutting a metal with small cutting resistance, and a tooth thereof. <P>SOLUTION: A central part in a tooth width direction of a cutting face 9 of the tooth 4 is made to a flat surface 9a parallel to a line X in the tooth width direction perpendicular to a center line in the tooth width direction and both sides in the tooth width direction of the flat surface 9a are made to inclined surfaces 9a, 9b inclined relative to the line in the tooth width direction. Both edges in the tooth width direction of a tip of the tooth 4 are chamfered to provide chamfered surfaces 10, 10. A cutting blade 8 is made to a constitution having a straight blade by the flat surface 9a and a chamfering blade by the chamfered surfaces 10, 10. Cutting is performed by the straight blade and the chamfering blade while staggering a cutting timing. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a saw blade for metal cutting and a saw for metal cutting.

As a conventional saw tooth, a rake face formed on the tooth tip and inclined from the cutting edge (intersection line of the rake face and the flank face) toward the groove side, and the rake face from the cutting edge to the tooth tip And a flank formed on the opposite side are known.
Japanese Patent Laid-Open No. 2001-1212

The conventional saw teeth have the following problems.
That is, since the conventional rake face of the tooth is a flat inclined surface, the cutting edge becomes a straight line that intersects the center line in the thickness direction. Therefore, when cutting the material to be cut, the straight cutting edge is covered all at once. There is a problem that the cutting resistance is large because the cutting material enters the cutting material.

  The present invention has been made in view of such circumstances, and the main object is to have a structure in which the rake surface has two inclined surfaces facing outward, and the center of the cutting blade in the thickness direction when cutting the material to be cut. The present invention provides a saw tooth for metal cutting that can reduce cutting resistance by allowing a side edge portion of a cutting blade to cut into and enter the material to be cut after the portion has been cut and entered into the material to be cut. .

  Another object is to chamfer both edges in the tooth width direction of the tooth tip, and the cutting blade has an inclined blade by two inclined surfaces and a chamfering blade by chamfering, or a chamfering blade by chamfering. The cutting force can be further reduced by using the configuration of the cutting edge, and the chips when cutting the material to be cut were cut by the center portion in the tooth width direction of the cutting blade, the inclined blade, and the chamfering blade. An object of the present invention is to provide a metal cutting saw tooth that can be separated from the workpiece in order, or in the order in which the cutting edge is cut by the chamfering blade in the center portion in the tooth width direction.

  Another object of the present invention is to provide a saw for metal cutting having a small cutting resistance using the teeth.

  In addition, another object is to chamfer both edges in the tooth width direction of the tooth tip of the first tooth, and the cutting blade has an inclined blade by two inclined surfaces and a chamfering blade by chamfering, or chamfering by chamfering. By making the blade have a configuration that the cutting edge has, the cutting resistance can be further reduced, and the chips when cutting the material to be cut can be divided into the center portion in the tooth width direction of the cutting edge, the inclined blade, and the chamfering blade. An object of the present invention is to provide a metal cutting saw tooth that can be separated from the workpiece in the order of cutting by the cutting direction, or in the center of the cutting edge in the tooth width direction and in the order of cutting by the chamfering blade.

  In order to achieve the above object, the present invention employs the following means.

  The metal cutting saw tooth according to the first aspect of the present invention is a metal cutting saw tooth having a rake face formed at a tooth tip and inclined from the cutting edge toward the groove side, the rake face being outward. It has two inclined surfaces which faced.

  The tooth of the saw for metal cutting according to the second invention is characterized in that both edges in the tooth width direction of the tooth tip are chamfered.

  The metal cutting saw according to a third aspect of the present invention is the metal cutting saw having a large number of teeth having a rake face formed on the tooth tip and inclined from the cutting edge toward the groove side, wherein the tooth is the first saw. A plurality of teeth and a second tooth adjacent to the first tooth, the rake face of the first tooth has two inclined surfaces facing outward, and the tip of the second tooth Is lower than the tip of the first tooth.

  The saw for metal cutting according to a fourth aspect of the present invention is characterized in that both edges in the tooth width direction of the tip of the first tooth are chamfered.

  According to the first invention, since the rake face has two inclined faces facing outward, the side edge part of the cutting edge, which is the intersection line of the rake face and the flank face, is the central part in the tooth width direction. Because the inclined blade is retracted further toward the flank side, when cutting the material to be cut, the tooth width of the cutting edge is cut into the cut material at the center in the thickness direction, and then the side edge of the cutting blade is cut. In other words, unlike the conventional case, the cutting edge can be reduced because the linear cutting edge does not cut into the cut material at once.

  According to the second aspect of the present invention, since both edges in the tooth width direction of the two inclined surfaces provided on both sides in the tooth width direction are chamfered, the cutting blade is inclined to the flank side from the central portion in the tooth width direction. And a chamfering blade connected to the inclined blade, or a chamfering blade. Therefore, when cutting the material to be cut, the center part in the tooth width direction of the cutting blade enters the material to be cut, and then the inclined blade of the cutting blade enters the material to be cut and further the chamfering blade of the cutting blade is covered. Since the cutting material enters the cutting material, or the chamfering blade of the cutting blade enters the material to be cut after the center part in the tooth width direction of the cutting blade enters the material to be cut, Cutting resistance can be further reduced, and the durability of the teeth can be increased. In addition, the chips when cutting the material to be cut are cut in the order of cutting by the tooth width direction center part of the cutting edge, the inclined blade, and the chamfering blade, or in the tooth width direction center part of the cutting edge and the chamfering blade. Since the material to be cut is left in the order in which it is cut and pushed out to the front of the rake face, it is possible to prevent chips from flowing from the rake face to the flank side (rear in the rotational direction). Accordingly, it is possible to eliminate chips from being seized between the teeth and the cut surface of the material to be cut, and it is possible to eliminate contamination of the cut surface due to the chips.

  According to the third invention, since the tip of the second tooth is made lower than the tip of the first tooth, the portion remaining without being cut by the first tooth even if the cutting edge of the second tooth is a straight line Is cut with the second tooth, that is, the portion remaining without being cut by the first tooth with a time lag is cut with the second tooth, so the cutting resistance applied to the second tooth is conventionally reduced. As a result, a metal cutting saw having a low cutting resistance can be obtained.

  According to the fourth aspect of the invention, since both edges in the tooth width direction of the two inclined surfaces provided on both sides in the tooth width direction are chamfered, the cutting edge of the first tooth is on the flank side from the center portion in the tooth width direction. It has a retreated inclined blade and a chamfered blade connected to the inclined blade, or has a chamfered blade. Therefore, when cutting the material to be cut, the center part in the tooth width direction of the cutting blade enters the material to be cut, and then the inclined blade of the cutting blade enters the material to be cut and further the chamfering blade of the cutting blade is covered. Since the cutting material enters the cutting material, or the chamfering blade of the cutting blade enters the material to be cut after the center part in the tooth width direction of the cutting blade enters the material to be cut, The cutting resistance of the first tooth can be further reduced, and the durability of the first tooth can be enhanced. In addition, the chips when cutting the material to be cut are the center portion in the tooth width direction of the cutting edge of the first tooth, the order of cutting by the inclined blade, the chamfering blade, or the center portion in the tooth width direction of the cutting edge, the surface Since the material to be cut is removed in the order cut by the cutting blade and pushed out to the front of the rake face, it is possible to prevent chips from flowing from the rake face to the flank side (rear in the rotational direction). Accordingly, it is possible to eliminate chips from being seized between the teeth and the cut surface of the material to be cut, and it is possible to eliminate contamination of the cut surface due to the chips.

Embodiments of the present invention will be described below.
Embodiment 1
FIG. 1 is a side view of a circular saw according to an embodiment of the present invention, and the circular saw rotates clockwise in FIG. 1 to cut a material to be cut. The side in the direction of rotation of the saw refers to the side opposite to the direction of rotation. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a view taken along the line III-III of FIG.

  As shown in FIGS. 1 to 3, an even number of protrusions 2 are formed at intervals of about 10 mm on the outer peripheral edge of a disc-shaped metal saw body 1 having a diameter of 250 mm and a thickness of 1.7 mm. . A recess 3 having an L-shaped surface in side view is formed in the front portion of the protrusion 2. Of the recesses 3, cemented carbide tooth tips 5 are attached to those not adjacent to each other by brazing, and the cemented carbide tooth tips 7 are attached to the remaining recesses 3 by brazing. Yes. The tooth tip 5 and the tooth tip 7 have a thickness of 2.0 mm. A first tooth 4 having a tooth width of 2 mm is formed by the tooth chip 5 and the protrusion 2 to which the tooth chip 5 is attached, and the tooth width is formed by the tooth chip 7 and the protrusion 2 to which the tooth chip 7 is attached. A 2 mm second tooth 6 is formed.

  The said 1st tooth | gear 4 has the rake face 9 made into the inclination which goes to the below-mentioned groove | channel 21 side from the cutting edge 8 formed in a tooth tip. The rake angle (α1) of the rake face 9 is 10 °. The rake face 9 includes a center line in the thickness direction of the saw body 1, in other words, a center flat face 9a orthogonal to the center line L in the tooth width direction in FIG. 3, and left and right edges (left and right) of the flat face 9a. 3 has two inclined surfaces 9b and 9b facing the left and right outer sides, following the upper side in FIG. 3 and right means the lower side in FIG. As shown in FIG. 3, the angle (β1) between the inclined surfaces 9b, 9b and the imaginary line orthogonal to the center line L, in other words, the inclination angle (β1) with respect to the tooth width direction line X orthogonal to the center line L is 5 ° to 5 °. 13 °. The left and right width (width in the tooth width direction) of the flat surface 9a is about one fifth to one third of the thickness (tooth width) 2 mm of the first tooth 4 and the length of the left and right edges (tooth depth). (Length in direction) N1 is about 0.3 mm to 0.4 mm.

  A flank 12 is formed behind the cutting edge 8. The flank 12 has a front side portion 12a and a rear side portion 12b. The clearance angle (γ1) of the flank 12 is 9 °.

  The second tooth 6 has a rake face 17 formed on the tooth tip and inclined from the cutting edge 16 toward the groove 21 described later. The rake angle (α2) of the rake face 17 is 10 °. The rake surface 17 is a flat surface orthogonal to the center line L in FIG. The length of the left and right edges (length in the toothpaste direction) N2 of the rake face 17 is about 0.3 mm to 0.4 mm.

  A flank 19 is formed behind the cutting edge 16. The flank 19 has a front side portion 19a and a rear side portion 19b. The clearance angle (γ2) of the clearance surface 19 is 9 °.

  A groove 21 is formed between the rear end of the rear side portion 12b of the first tooth 4 and the front end of the rake face 17 of the subsequent second tooth 6, and the rear end of the rear side portion 19b of the second tooth 6; A groove 21 is formed between the front end of the rake face 9 of the subsequent first tooth 4. The depth of the groove 21 is 6 mm. The said groove | channel 21 follows the radial direction following the 1st curved part 21a hollowed in the 1st tooth | gear 4 (2nd tooth | gear 6) side following the front end of the rake face 9 (rake face 17), and this 1st curved part 21a. A straight portion 21b, a second curved portion 21c recessed toward the saw body 1 side following the end of the straight portion 21b on the saw body 1 side, a front end and a rear side portion 12b (rear side portion 19b) of the second curved portion 21c ) And an inclined portion 21d connected to the rear end.

  The tip of the cutting edge 16 is lower than the tip of the cutting edge 8 by 0.01 mm to 0.03 mm. That is, the tooth tip of the second tooth 6 is made lower than the tooth tip of the first tooth 4.

Embodiment 2
4 is an enlarged side view of the main part showing the configuration of the second embodiment, FIG. 5 is an enlarged perspective view of the main part, and FIG. 6 is a view taken along the line VI-VI in FIG. In the saw of the second embodiment, the rake angle (α1) in the first embodiment is 12 °, the inclination angle (β1) is 5 to 13 °, preferably 12 °, the clearance angle (γ1) is 9 °, The width of the flat surface 9a in the tooth width direction is 0.2 to 0.4 mm, and both edges of the tooth width direction of the tooth tip of the first tooth 4 are chamfered to provide two chamfered surfaces 10, 10. It is.

The rake face 9 has a flat surface 9a at the center in the tooth width direction, and has inclined surfaces 9b and 9b on both sides in the tooth width direction, and the intersection of the flat surface 9a and the inclined surfaces 9b and 9b with the flank 12 Is the cutting edge 8. The inclined surfaces 9b and 9b of the cutting edge 8 have chamfering edges 8b and 8b formed by chamfering surfaces 10 and 10 by chamfering the portion to be the cutting edge, and the chamfering edges 8b and 8b and A cutting blade 8 is constituted by a straight blade 8a formed by a flat surface 9a.
The flat surface 9a has a tooth width direction width H1 of about 0.2 to 0.4 mm, and the inclined surfaces 9b and 9b have a tooth width direction width H2 of about 0.8 to 0.9 mm. The width H3 in the tooth width direction is 1/4 to 2/5 of the tooth width 2mm, preferably 0.8 to 0.9mm, in other words, equal to the inclined surfaces 9b and 9b.

  The inclination angle (β2) in the radial direction with respect to the tooth width direction line X of the chamfered surfaces 10 and 10 is set to 4 to 15 °. The chamfered surfaces 10, 10 have an inclination angle (β2) and a width H3 in the tooth width direction of 0.1 to 0.3 mm from both edges of the tooth width direction to the center in the tooth width direction as shown in FIG. The distance b that is spaced radially inward from the biased position a is formed to be 0.08 mm. That is, since the cutting depth of the teeth when cutting the workpiece is generally 0.02 to 0.05 mm, the distance b is the cutting depth (0.02) in the middle of the chamfered surfaces 10 and 10 in the width direction. To chamfering blades 8b and 8b until the middle of the chamfered surfaces 10 and 10 in the width direction, and the chamfered surfaces 10 and 10 are not chamfered from the middle of the chamfered surfaces 10 and 10 in the width direction. It is configured to be a blade. Further, the chamfered surfaces 10 and 10 are provided from the rake face 9 to the inclined portion 21 d of the groove 21.

  In the saw configured as described above, the cutting amount differs depending on the hardness of the material to be cut, and the height difference in the radial direction between the first tooth 4 and the second tooth 6 differs depending on the cutting amount. For example, the amount of cut when cutting general steel is 0.03 to 0.04 mm, and the height difference in the radial direction between the first tooth 4 and the second tooth 6 is about 0.05 mm, and when cutting hard steel The depth of cut is 0.02 to 0.03 mm, and the height difference in the radial direction between the first tooth 4 and the second tooth 6 is about 0.03 to 0.04 mm. That is, when cutting hard steel, the amount of cutting is smaller than when cutting general steel, so the saw that cuts hard steel has the first teeth 4 and second teeth compared to the saw that cuts general steel. The height difference in the radial direction of the tooth 6 is reduced.

  Since the tooth tip of the second tooth 6 is made lower than the tooth tip of the first tooth 4, and the cutting edge 8 of the first tooth 4 has a straight blade 8a and chamfering blades 8b and 8b, the first tooth 4, and the second tooth 6 cuts the portion left uncut by the first tooth 4, so that the cutting resistance of the second tooth 6 can also be reduced.

  Further, when the tip of the second tooth 6 is made lower than the tip of the first tooth 4, the cutting resistance of the first tooth 4 is larger than the cutting resistance of the second tooth 6. It is preferable that γ1) is made larger than the clearance angle (γ2) of the second tooth 6 to improve the machinability of the first tooth 4. However, if the clearance angle (γ1) is increased, the first teeth 4 are likely to be chipped, and the clearance angle (γ1) cannot be increased to a predetermined value or more. The saw of the present invention is provided with the inclined surfaces 9b and 9b on the rake face 9 and the chamfered surfaces 10 and 10 on both sides of the tooth width direction of the tooth tip, so that the first clearance angle (γ1) is not increased. The cutting resistance of the teeth 4 can be reduced and the durability can be increased.

  The cutting edge 8 of the first tooth 4 has a straight blade 8a provided at the center in the tooth width direction and chamfering blades 8b and 8b retracted toward the flank 12 from the straight blade 8a. When cutting the material to be cut by moving the material, the chamfering blades 8b and 8b cut and enter the material to be cut after the straight blade 8a enters the material to be cut, and the straight blade 8a and the chamfering blade 8b. , 8b are sequentially cut, the cutting resistance of the first teeth 4 can be further reduced, and the durability of the first teeth 4 can be further enhanced. And the 2nd tooth | gear 6 cuts the tooth width direction both sides part which the 1st tooth | gear 4 does not cut. Therefore, the material to be cut can be cut by the cutting groove corresponding to the tooth width.

  Incidentally, the inclination angle (β2) of the chamfered surfaces 10, 10 of the first tooth 4 and the width H3 in the tooth width direction are from the both edges of the tooth width direction to the center side in the tooth width direction as shown in FIG. It is formed so that the distance b spaced radially inward from the position a deviated by 0.1 to 0.3 mm is 0.08 mm, and the chamfered surfaces 10 and 10 have a relationship with the cutting depth of the teeth. Since the chamfering blades 8b and 8b are provided up to the middle in the width direction, and the chamfered surfaces 10 and 10 are configured so that the outer side in the tooth width direction is a non-chamfered blade from the middle in the width direction. The cutting width can be surely made narrower than the tooth width of 2 mm, and the cutting resistance of the first tooth 4 can be reduced.

Since the chips when cutting the workpiece are pushed away from the workpiece in the order of cutting by the straight blade 8a of the cutting edge 8 of the first tooth 4 and the chamfering blades 8b, 8b, the chips are pushed forward of the rake face 9. The chips can be prevented from flowing from the rake face 9 toward the flank 12 (rear in the rotational direction). Accordingly, it is possible to eliminate chips from being seized between the teeth and the cut surface of the material to be cut, and it is possible to eliminate contamination of the cut surface due to the chips. In addition, a brush for scrubbing fine chips adhering to the first tooth 4 and the second tooth 6 of the saw is disposed at a place separated from the part to be cut of the saw in the circumferential direction. It is possible to reduce the scraping amount of chips and to easily remove them.
Since other configurations and operations are the same as those of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof and description of the operations and effects are omitted.

  The flat surface 9a may be omitted. The tip of the cutting edge 16 may be the same height as the tip of the cutting edge 8.

  In the embodiment described above, the chamfered surfaces 10b are chamfered from the boundary between the inclined surfaces 9b and 9b and the flat surface 9a, and the chamfered surfaces 10 and 10 are provided. In addition, the inclined surfaces 9b and 9b are arranged in the tooth width direction. Chamfering is performed in the middle, and an inclined blade by the inclined surfaces 9b, 9b is provided on the center side in the tooth width direction of the inclined surfaces 9b, 9b. The cutting edge 8 may have a configuration. By configuring in this way, after the straight blade 8a cuts and enters the material to be cut, the inclined blade and the chamfering blades 8b and 8 sequentially cut and enter the material to be cut, and the straight blade 8a, the inclined blade and the chamfered blade Since 8b and 8b are sequentially cut, the cutting resistance of the first tooth 4 can be further reduced, and the chips are the straight blade 8a, the inclined blade and the surface of the cutting edge 8 of the first tooth 4. The material to be cut is removed in the order of cutting by the cutting blades 8b, 8b and pushed out to the front of the rake face 9.

It is a side view which shows Embodiment 1 of this invention. It is a principal part enlarged view of FIG. It is the III-III arrow directional view of FIG. It is an enlarged side view of the principal part which shows the structure of Embodiment 2 of this invention. It is an expansion perspective view of the principal part. It is the VI-VI line arrow directional view of FIG.

Explanation of symbols

4 First tooth 6 Second tooth 8 Cutting edge 9 Rake face 9a Flat face 9b Inclined face 10 Chamfered face 21 Groove

Claims (4)

  In a metal cutting saw tooth having a rake face formed on the tooth tip and inclined from the cutting edge toward the groove side, the rake face has two inclined faces facing outward. Features saw blades for metal cutting.   The tooth of a saw for metal cutting according to claim 1, wherein both edges of the tooth tip in the tooth width direction are chamfered.   A metal cutting saw having a plurality of teeth formed on a tooth tip and having a rake face inclined from a cutting edge toward a groove side, wherein the tooth is a first tooth and a second tooth adjacent to the first tooth. The rake face of the first tooth has two inclined faces facing outward, and the tip of the second tooth is made lower than the tip of the first tooth. A saw for cutting metal, characterized in that The saw for metal cutting according to claim 3, wherein both edges in the tooth width direction of the tip of the first tooth are chamfered.

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