JP4702804B2 - Circular saw for metal cutting - Google Patents

Description

The present invention relates to a circular saw used for cutting a metal material such as a steel pipe.

  As shown in FIG. 10, a sawtooth (52) is integrally formed on the outer periphery of a disc-shaped base metal (51), and a chip (54) is brazed to a pedestal (53) of the sawtooth (52). When the side flank (56) of the tip (54) is ground for the circular saw (50) for cutting, as shown in FIGS. 11 and 12, the circular saw (50) is usually moved in the direction of arrow A (rake direction). On the other hand, a cup grindstone (55) that rotates in the opposite direction to the circular saw (50) was brought into contact with both sides of the tip (54) of the circular saw (50). Then, as shown in FIG. 13, this polishing process forms a lateral relief surface (56) of the tip (54). When the workpiece is cut by the circular saw (50), the circular saw (50) As a result, the saw blade (52) was less shaken in the left-right direction, and as a result, the cutting surface of the workpiece was less rough and good cutting was possible.

However, in the case of the tip (54) polished by the cup grindstone (55) described above, as shown in FIG. 14, the tip (54) has an inclination (B) in the diameter direction of the circular saw (50). However, as shown in FIG. 15, the tip (54) cannot be inclined in the rotational direction (e) of the circular saw (50).

Further, in the case of the circular saw (50), although it is possible to cut the work material well, since the frictional resistance of the lateral flank (56) when cutting the work material is large, the wear of the tip (54) and There was a problem that chipping was likely to occur and the life of the chip (54) was short.

In order to cope with such a problem, there is also known a circular saw having a chip provided with a recess extending from a rear end to a front end portion at a corner portion formed by an outer peripheral flank and a lateral flank.
JP 2002-1614

However, in the case of the circular saw described above, it is easy for unwanted material such as brazing material to enter the recess of the chip, and when the chip is worn and the chip is re-polished, the recess disappears. Later, there was a problem that the effect of preventing wear or chipping of the chip due to the depression could not be obtained.

The object of the present invention is to obtain a good cut surface after cutting the work material and reduce the frictional resistance of the side flank surface during cutting of the work material, thereby effectively causing chip wear and chipping. An object of the present invention is to provide a circular saw for metal cutting which can be suppressed and can obtain the same effect even after re-polishing of a chip.

In the first aspect of the present invention, a saw blade is formed on the outer periphery of a disk-shaped base metal at a predetermined interval, and a chip is fixed to the saw blade. A plurality of surfaces having different clearance angles from the edge toward the rear edge, a first clearance surface having a predetermined width is provided behind the front edge of the lateral clearance surface, and a first clearance surface is provided behind the first clearance surface. two flank faces and one or more clearance surfaces subsequent are provided, each flank is formed lower height in the thickness direction of the base metal relative to the flank of the front, first flank the It is formed by bringing a cup grindstone into contact with both sides of the chip, and the second flank faces ring grindstones on both sides of the chip so that the first flank surface remains with a predetermined width, and the circumferential direction is the front-back direction of the chip It is formed in the concave arc shape by making it contact .

According to a second aspect of the present invention, in the circular saw for metal cutting in which saw teeth are formed at regular intervals on the outer periphery of the disk-shaped base metal, and the chips are fixed to the saw teeth, the side clearance surface of the chips is the first. The first flank is divided into a flank and a second flank, the first flank is provided with a predetermined width from the front edge of the side flank, and the second flank is provided behind the first flank. The height in the thickness direction of the gold is formed lower than the first flank , the first flank is formed by bringing a cup grindstone into contact with both sides of the chip, and the second flank is the first flank A ring grindstone is abutted on both sides of the chip so that one flank surface remains with a predetermined width, and is formed in a concave arc shape by bringing the ring grindstone into contact with the chip in the longitudinal direction .

The front and rear direction of the side clearance surface is based on the rotation direction of the circular saw, the front indicates the rotation direction of the circular saw (rake direction), and the rear indicates the direction opposite to the rotation direction of the circular saw. And

The third aspect of the present invention is the circular saw for metal cutting according to the first or second aspect, wherein the width of the first flank is 0.1 to 1.0 mm. .

In the circular saw for cutting metal according to the present invention , the second flank is formed lower than the first flank in the thickness direction of the base metal. The first flank that hits the workpiece is stably in contact with the workpiece, so there is less vibration of the saw blade in the left-right direction, resulting in a less rough cutting surface, and the second flank is in the thickness direction of the base metal. Since it is formed lower than the first flank, the frictional resistance of the side flank when cutting the workpiece is reduced, so that wear and chipping of the tip are effectively prevented, and therefore the life of the tip is extended. Moreover, according to the circular saw according to the present invention, the configuration of the first flank and the second flank in the lateral flank is maintained as it is even after the chip is worn and re-polished. There is a particular advantage that the various effects described above can be obtained even after re-polishing.

Furthermore, in the circular saw for metal cutting according to the present invention , the first flank is a polished surface by a cup grindstone. Therefore, while rotating the circular saw in the scooping direction, the side flank of the tip is rotated in reverse to the circular saw. Thus, there is an advantage that the first flank of each chip in the circular saw can be formed uniformly.

In the present invention as defined in claim 3 , the width of all or part of the first flank is in the range of 0.1 to 1.0 mm. When the width exceeds 1.0 mm, the frictional resistance at the time of cutting the workpiece increases and the wear of the tip increases. This is because the chipping is noticeable.

Next, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to such embodiments, and various modifications can be made within the scope of the gist.

As shown in FIGS. 1 to 3, saw teeth (2) are formed at regular intervals on the outer periphery of the disk-shaped base metal (1), and chips (4) are brazed to the pedestal (3) of the saw teeth (2). A circular saw for metal cutting (10) attached, wherein the side flank (5) of the tip (4) is divided into a first flank (6) and a second flank (7), and the first flank The surface (6) is formed with a width (W1) of 0.1 to 1.0 mm rearward from the front edge (5a) of the lateral clearance surface (5), and the second clearance surface (7) is the first clearance surface (6) Provided on the rear side, and the height of the base metal (1) in the thickness direction (arrow X direction) is lower than that of the first flank (6).

In the figure, (9) indicates a chip dividing groove.

In manufacturing the circular saw (10) according to the present embodiment, first, the base metal (1) is rotated in the scooping direction as in the circular saw (50) shown in FIG. A cup grindstone (55) that rotates in the opposite direction to the base metal (1) is brought into contact with both sides of the tip (4), so that the entire lateral flank (5) first becomes the first flank (6), and then 4 and 5 so that the first flank (6) remains with a width (W1) of 0.1 to 1.0 mm behind the front edge (5a) of the lateral flank (5). The second flank (7) having a concave arc shape is formed on the rear side of the first flank (6) by abutting and polishing (8) from both sides of the tip (4) of the circular saw (10). . As a result, the smooth first flank (6) polished by the cup grindstone (55) and the second flank (7) gradually lowered backward from the rear edge (6a) of the first flank (6). ) Is obtained. Therefore, by two-step polishing with the cup grindstone (55) and the ring grindstone (8), not only the inclination in the saw diameter direction (arrow B) as shown in FIG. 7 but also the saw rotation direction as shown in FIG. An inclination (arrow C) can be added.

Further, the circular saw (10) according to the present embodiment can be manufactured by a method other than the above manufacturing method, that is, in the present embodiment, the second flank (7) is formed by the ring grindstone (8). However, the second flank (8) may be formed with a cup grindstone instead of the ring grindstone (8), or, as shown in FIG. 8, polishing with a cup grindstone or ring grindstone in advance, or chip molding. By making the cup grindstone (55) come into contact with the front part of the side flank (25) of the tip (24) inclined by the saw rotation by itself, the side flank (25) The first flank (6) and the second flank (7) may be formed. Furthermore, both the first flank and the second flank may be formed by polishing with a ring grindstone.

In the present embodiment, the lateral flank (5) (25) is composed of the first flank (6) and the second flank (7), but the second flank (7) is further behind the second flank (7). It is also possible to form one or more flank surfaces such as three flank surfaces. Even in this case, the clearance angle is set to be lower in order from the first clearance surface.

As shown in FIG. 9, the circular saw (30) is another embodiment, and the saw blades (32) are formed at regular intervals on the outer periphery of the disk-shaped base metal (31), as in the above-described embodiment. The tip (34) is brazed to the pedestal (33) of the saw blade (32), but in this embodiment, the lateral flank (35) of the tip (34) is the first flank (36) and the first flank (36). The second flank (37) is divided into two flank surfaces (37), and the second flank surface (37) extends from the upper edge (34a) of the tip (34) to the lower edge (34b) in the diameter direction (Y) of the circular saw (30). In the longitudinal direction (Z) of the tip (34), the tip (34) is formed from the rear edge (34c) to the front edge (34d), and the remaining part is the first flank (36). The second flank (37) is formed such that the height of the base metal (31) in the thickness direction (arrow X direction) is lower than that of the first flank (36). More specifically, the second flank (37) is a rectangular flat surface and has a structure that is one step lower than the first flank (36). Moreover, in this embodiment, the width (W1) of the part located in the front side of the 2nd flank (37) among the 1st flank (36) is 0.1-1.0 mm.

The circular saw according to the present invention can be widely used for cutting various metal materials because a good cut surface can be obtained while effectively preventing chip wear and chipping.

It is a principal part side view of the circular saw which concerns on this invention. It is an expansion perspective view of the sawtooth part in the same circular saw. It is the enlarged side view of a sawtooth part similarly. It is an enlarged front view which shows the grinding | polishing state of the chip | tip with a ring grindstone. It is an enlarged plan view which similarly shows the grinding | polishing state of the chip | tip with a ring grindstone. It is an enlarged plan view of the sawtooth part in the circular saw of this invention. It is the enlarged front view of a sawtooth part similarly. It is an enlarged plan view which shows the grinding | polishing state of a chip | tip. It is an expansion perspective view of the sawtooth part of the circular saw which concerns on other embodiment. It is an expansion perspective view of the sawtooth part in the conventional circular saw. It is a front view which shows the grinding | polishing state of the chip | tip in the conventional circular saw. It is a front view which similarly shows the grinding | polishing state of a chip | tip. It is an enlarged side view of the sawtooth part in the conventional circular saw. It is the enlarged front view of a sawtooth part similarly. It is the enlarged plan view of a sawtooth part similarly.

(1) Disc-shaped base metal
(2) Saw blade
(3) Pedestal
(4) Chip
(5) Side relief surface
(6) First flank
(7) Second flank
(8) Ring whetstone
(10) Circular saw

Claims (3)

In a circular saw for metal cutting in which saw teeth are formed at regular intervals on the outer periphery of a disk-shaped base metal, and chips are fixed to the saw teeth, the lateral clearance surfaces of the chips are different from the leading edge toward the trailing edge. A first clearance surface having a predetermined width is provided behind the front edge of the lateral clearance surface, and a second clearance surface and one or more following the second clearance surface are provided behind the first clearance surface. Each flank is formed with a lower height in the thickness direction of the base metal than the front flank, and the first flank abuts the cup grindstone on both sides of the chip. The second flank is recessed by contacting a ring grindstone on both sides of the chip so that the circumferential direction thereof is the front-rear direction of the chip so that the first flank remains with a predetermined width. A circular saw for metal cutting, formed in an arc. In a circular saw for metal cutting in which saw blades are formed at regular intervals on the outer periphery of a disk-shaped base metal, and chips are fixed to the saw teeth, the lateral clearance surfaces of the chips are divided into first and second clearance surfaces. The first flank is provided with a predetermined width rearward from the front edge of the lateral flank, and the second flank is provided behind the first flank and has a height in the thickness direction of the base metal. The first flank is formed lower than the first flank, and the first flank is formed by abutting a cup grindstone on both sides of the chip, and the second flank is such that the first flank remains with a predetermined width. A circular saw for metal cutting, which is formed in a concave arc shape by abutting ring grindstones on both sides of the chip so that the circumferential direction thereof is the front-rear direction of the chip. The circular saw for metal cutting according to claim 1 or 2, wherein the width of the first flank is 0.1 to 1.0 mm.

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