JPH0516059U - Saw blade - Google Patents

Abstract

(57) [Summary] [Structure] A cutting blade 24 formed at the tip of the saw blade 21 protruding from the outer edge portion 23 of the saw body 22 in the protruding direction.
Is composed of a flat blade portion 24A and a concave curved blade portion 24B, and the saw blade 21 moves from both ends of the cutting blade 24 toward the central portion.
Mold so as to retract with respect to the protruding direction of. [Effect] It is possible to prevent the occurrence of burrs at the time of cutting and also to prevent the occurrence of a blade runout phenomenon, thereby improving the cutting accuracy, and as a result, it is possible to obtain a good cutting surface. .. Also, in addition to suppressing blade runout, the number of blades can be substantially increased compared to staggered blades, etc.,
High feed cutting is possible and cutting efficiency can be improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a saw blade formed on a building material such as a particle board or a paper-coated board, or a plate saw or a circular saw for cutting a metal material or the like.

[0002]

[Prior Art]

 As such a saw blade, for example, one having a shape as shown in FIG. 5 is used. The saw blade 1 is formed integrally with a saw body 2 in the form of a thin plate made of steel or the like and is projected from an outer edge portion 3 of the saw body 2. Such a saw blade 1 is directed in a traveling direction of the saw body 2. A large number of them are arranged in series along the outer edge portion 3 along F, and cutting blades 4 are provided at the tips of the respective saw blades 1 in the projecting direction (upward in the figure) and on the front side in the traveling direction F. Has been formed. Here, the saw blade 1 shown in FIG. 5 has a direction in which the cutting blade 4 is perpendicular to the above-mentioned protruding direction and the traveling direction F of the saw body 2, that is, a direction parallel to the thickness direction of the saw body 2 (hereinafter, simply referred to as the thickness). It is formed in a straight line in the direction) and is generally called a flat blade.

By the way, when the above-mentioned building materials, metal materials, etc. are cut by such a flat blade saw blade, so-called burr formation becomes a problem. As shown in FIG. 6, as the cutting progresses and the remaining portion 6 of the work material 5 becomes smaller, the remaining portion 6 is moved to the outside of the cutting surface 7 by the stress due to the cutting force and the pressing force of the saw blade 1. This is caused by deformation, and this deformed portion is not completely removed from the cut surface 7 and remains as a burr.

Therefore, in order to suppress the occurrence of such burr, a saw blade having a shape as shown in FIG. 7 has been proposed. The saw blade 11 shown in this figure includes a saw blade 11A which is formed at the protruding tip thereof and which inclines toward the rear side in the protruding direction as the cutting edge 12 goes from one end to the other end of the cutting blade 12, and a cutting blade. The cutting blade 12 is composed of two types of saw blades 11A and 11B in which the cutting blade 12 inclines in mutually opposite directions, and a saw blade 11B inclining toward the rear side in the projecting direction from the other end toward one end. .. The saw blades 11A and 11B are alternately formed on the outer edge portion 3 of the saw body 2 along the traveling direction F 1, and are generally called staggered blades. According to the saw blade 11 formed in such a staggered blade, the remaining portion 6 of the work material 5 is deformed toward the inside of the cutting surface 7 as the cutting progresses as shown in FIG. The deformed portion does not remain on the cut surface 7, and it is possible to prevent the occurrence of burrs.

[0005]

[Problems to be solved by the device]

 However, in the saw blade 11 formed in such a staggered blade, the cutting blade 12 is formed so as to be inclined, so that the cutting load acting on each saw blade 11 in the above thickness direction is increased. As a component force, a force that presses the saw blade 11 in the thickness direction is generated. In the staggered blade, the cutting blades 12 are alternately formed with saw blades 11A and 11B that are inclined in opposite directions, so that the pressing force also acts alternately in both the thickness directions. As a result, the saw blade 11 swings in the thickness direction during the cutting operation, causing a blade wobbling phenomenon. In particular, since the saw body 2 on which such a saw blade 11 is formed is made relatively thin, this blade runout phenomenon becomes more remarkable, resulting in deterioration of cutting accuracy and cutting There was a risk of increasing the load.

Further, in the staggered blade having the above structure, the saw blade 11A and the saw blade 11B cut different portions of the work material 5, so that the saw blades 11A and 11B form a pair. It will be used for cutting. Therefore, compared to, for example, a flat blade, it is difficult to form saw blades with half the pitch in order to obtain the same cutting efficiency, and it is difficult to form saw blades. In that case, the feed cannot be increased and the cutting efficiency will be reduced.

[0007]

[Means for Solving the Problems] The present invention has been made to solve the above problems, and is formed by projecting from a saw body, and a cutting edge is formed at the tip in the projecting direction. In this saw blade, the cutting blade is shaped so as to recede in the protruding direction from both ends of the cutting blade toward the central portion.

[0008]

[Action]

 In the present invention, as described above, the cutting blade is formed so as to recede with respect to the protruding direction of the saw blade from both ends thereof toward the center. In other words, the central part of the cutting edge is recessed toward the saw body when viewed from the front side in the traveling direction of the saw body, so that even if cutting proceeds, the remaining part of the work material does not face the inside of the cutting surface. As a result, the deformed portion does not remain on the cut surface as in the case of the zigzag blade.

Further, according to the present invention, a cutting blade portion that is directed toward the rear side in the protruding direction as it is separated from one end side of the cutting blade, and a cutting blade portion that is directed toward the rear side in the protruding direction as it is separated from the other end side. Two cutting edge portions facing in opposite directions are formed into one cutting edge. Therefore, the component force in the thickness direction of the cutting load acting on each saw blade acts in the opposite direction in the two cutting edge portions, and these component forces cancel each other out, resulting in the saw blade It is possible to prevent generation of a force pressing in the thickness direction. Furthermore, according to the present invention, the cutting progresses while the individual cutting blades uniformly cut the work material, so that a saw blade having substantially twice the same pitch as the staggered blade is used. It is possible to provide.

[0010]

【Example】

 FIG. 1 shows an embodiment of the present invention. In this figure, the saw blade 21 is integrally formed with a thin plate-shaped or thin disk-shaped saw body 22 made of steel or the like. It is formed so as to project in a direction perpendicular to the thickness direction.

Here, as seen from the front side of the saw body 22 in the traveling direction F, the saw blade 21 follows from the tip side of the saw blade 21 in the protruding direction (upward in the figure) toward the outer edge portion 23 side. Is formed so as to be slightly narrowed. In addition, the tip end surface of the saw blade 21 in the protruding direction is an inclined surface that also recedes toward the outer edge portion 23 side from the front side in the traveling direction F toward the rear side. Further, in the present embodiment, a large number of such saw blades 21 are arranged in series along the traveling direction F of the saw body 22 at the outer edge portion 23. In the case of a circular saw, the traveling direction F of the saw body 22 is the direction of rotation thereof, and in the case of a plate saw, it is the direction to which the feed is mainly given among the reciprocating directions.

The saw blades 21 are formed at the tips of the saw blades 21 in the protruding direction and on the front side in the traveling direction F, at both ends in the thickness direction of the saw blades 21 when viewed from the front side in the traveling direction F. Further, a cutting edge 24 composed of a straight flat blade portion 24A parallel to the thickness direction and a concave curved blade portion 24B formed in the central portion in the thickness direction and receding in an arc shape with respect to the protruding direction is provided. Has been formed.

In the present embodiment, the radius R of the arc formed by the concave curved blade portion 24B is such that R / W is about 0.8 with respect to the width W of the entire cutting blade 24 in the thickness direction. Is set to. The fan angle θ of the arc is set to about 60 °.

In the saw blade 21 having such a configuration, the cutting blade 24 is retracted from the both ends of the cutting blade 24 toward the center through the straight flat blade portion 24 in the protruding direction. It is molded like. As a result, as shown in FIG. 2, the remaining portion 6 of the work material 5 is deformed toward the inside of the cutting surface 7 as the cutting progresses, and this deformed portion does not remain on the cutting surface 7. Absent. That is, since the remaining portion 6 is completely scraped off at the end of cutting, the occurrence of burrs can be prevented.

In addition, in the concave curved blade portion 24B of the cutting blade 24, with the center line C of the cutting blade 24 as a boundary, as it is separated from one end of the concave curved blade portion 24B, it is an arcuate shape that goes toward the rear side in the protruding direction. A cutting edge portion and an arcuate cutting edge portion that extends toward the rear side in the projecting direction as being separated from the other end of the concave curved blade portion 24B are formed. In other words, one saw blade 21 is formed with two concave curved blades that are directed in mutually opposite directions, whereby the component force in the thickness direction of the cutting load that acts on the cutting blade 24 at the time of cutting is reduced. These two cutting edge portions of section 24 will act in opposite directions. Since these component forces cancel each other out, it is possible to prevent the force that presses the saw blade 21 in the thickness direction from being generated, and suppress the swing of the saw blade 21 during the cutting operation to prevent the blade runout. As a result, it is possible to prevent the occurrence and improve the cutting accuracy and reduce the cutting load.

Further, while the above-mentioned staggered blade is used for cutting with two kinds of saw blades being paired, in the present embodiment, the cutting blades 24 of the individual saw blades 21 are formed in the same shape. Therefore, at the time of cutting, the cutting blade 24 of each saw blade 21 cuts the work material 5 uniformly while the cutting progresses. Therefore, compared to the above-mentioned zigzag blade, it is possible to substantially double the number of saw blades 21 when the pitch is the same, and it is possible to perform cutting with high feed and improve cutting efficiency. It becomes possible.

In this embodiment, the ratio R / W of the radius R of the arc formed by the concave curved blade portion 24B and the width W of the entire cutting blade 24 in the thickness direction is set to about 0.8 as described above. The fan angle θ of this arc is set to about 60 °, but the present invention is not limited to this. However, in consideration of the strength of the cutting edge portion 24 of the saw blade 21 and in order to effectively exhibit the above-mentioned effects, the R / W is in the range of 0.5 to 1.0 and the fan angle θ is 40 °. It is desirable to set in the range of 110 °. Further, in the present embodiment, the saw blade 21 is described as being integrally formed with the saw body 22, but in addition to this, the portion of the cutting blade 24 is fixed by brazing or the like with a sintered body containing diamond or CBN. It may be the one.

Next, FIG. 3 shows another embodiment of the present invention, in which the same parts as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted. In the saw blade 31 of this embodiment, the cutting blade 32 is composed of two slanting blades 32A and 32B which are linearly directed from the both ends of the saw blade 32 toward the center thereof, respectively, to the rear side in the projecting direction. As a result, the cutting blade 32 is formed in a V-shape which is recessed rearward in the protruding direction when viewed from the front side in the traveling direction F. The narrow angle φ sandwiched between these inclined blades 32A and 32B is set to about 164 ° in this embodiment.

Also in the saw blade 31 having such a configuration, the cutting blade 32 is formed so as to recede with respect to the above-mentioned protruding direction from both end sides toward the central portion, and therefore, it is similar to the above-described embodiment. The effect can be obtained. Moreover, since the cutting blade 32 is composed of the linear inclined blades 32A and 32B, it is possible to obtain the advantage that the molding of the cutting blade 32 is easier than in the above embodiment. Note that the narrow angle φ is preferably set in the range of 150 ° to 170 ° in consideration of the strength of the cutting edge 32 and effective exertion of the effect as in the above embodiment. Further, by combining this embodiment with the above embodiment, the flat blade portion 24A of the cutting blade 24 of the above embodiment may be an inclined blade as in this embodiment.

Further, FIG. 4 shows another embodiment of the present invention. As shown in this figure, the flat blade portion 24A of the cutting blade 24 of the embodiment shown in FIG. Alternatively, the inclined blades 32A and 32B of the embodiment shown in FIG. 3 may be provided with a land 41 or may be subjected to honing to improve the edge strength and prevent the cutting edge from being chipped. In this case, the land 41 and the like are set such that the angle δ of the saw blades 21 and 31 with respect to the front surface in the traveling direction F is in the range of 5 ° to 25 ° and the width L thereof is 0.02 mm to 0. It is suitable to set it within the range of 0.1 mm.

[0021]

[Effect of the device]

 As described above, according to the present invention, it is possible to prevent the occurrence of burrs at the time of cutting and also to prevent the occurrence of the blade runout phenomenon, thereby improving the cutting accuracy and, as a result, a good cutting. It becomes possible to obtain a face. Further, in addition to suppressing the blade runout, the number of blades can be substantially increased as compared with a staggered blade, so that high feed cutting can be performed and cutting efficiency can be improved.

[Brief description of drawings]

1 is a perspective view showing an embodiment of the present invention, and (b) a front view of a saw body 22 from a front side in a traveling direction F;

FIG. 2 is a diagram showing a case of cutting a work material 5 step by step in the order shown in (a) to (c) according to the embodiment shown in FIG.

3 (a) is a perspective view showing another embodiment of the present invention, and (b) is a front view of the saw body 22 from the front side in the traveling direction F. FIG.

FIG. 4 is a front view showing another embodiment of the present invention,
It is a (b) side view.

5 (a) is a perspective view showing a conventional example according to the present invention, and FIG. 5 (b) is a front view of the saw body 2 from the front side in the traveling direction F. FIG.

6A to 6C are diagrams showing a case of cutting a work material 5 according to the conventional example shown in FIG. 5 step by step in the order of (A) to (C).

7 (a) is a perspective view showing another conventional example related to the present invention, and (b) is a front view of the saw body 12 from the front side in the traveling direction F. FIG.

FIG. 8 is a diagram showing a case of cutting the work material 5 according to the conventional example shown in FIG. 7 step by step in the order of (A) to (C).

[Explanation of symbols]

 1,11,21,31 Saw blade 2,12,22 Saw body 3,13,23 Outer edge of saw body 2,12,22 4,14,24 Cutting edge 5 Work material 6 Residual portion 7 Cutting surface 24A Flat Blade portion 24B Recessed curved blade portion 32A, 32B Inclined blade R Radius of concave curved blade portion 24B W Width of cutting blade 24 θ Fan angle of concave curved blade portion 24B φ Narrow angle of inclined blades 32A, 32B

Claims (1)

[Scope of utility model registration request] 1. A saw blade, which is formed by projecting from a saw body and has a cutting edge formed at a tip portion in the projecting direction, wherein the cutting edge extends from both ends of the cutting edge toward a central portion. According to the saw blade, the saw blade is formed so as to retract with respect to the protruding direction.