JP2014050903A - Chip saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To selectively generate burrs on either of cut surfaces adjacent to each other in the cutting of a workpiece such as a steel pipe, or prevent the occurrence of the burrs on the cut surfaces of both sides.SOLUTION: A chip saw 21 is configured such that q tip flank 23a of chips 23 secured to a tip end of a saw blade 25 in a disc-like base metal 22 has a shape inclined to the left and right from the center in blade width direction of the chips 23, and inclination angles α1, α2 of slopes 24A, 24B are different to each other and are made asymmetrical. Also, a rake face 26 has a flat shape on one side, and a shape inclined in direction opposite to rotating direction of the chip saw 21.

Description

  The present invention relates to a tip saw used for cutting a steel pipe or the like.

  In general, the tip saw has a saw blade formed on the outer periphery of a disk-shaped base metal at regular intervals, and a tip is integrally fixed to the tip of the saw blade by brazing or the like. As seen from the side, the shape is symmetrical.

  Further, in the tip saw in which saw blades are formed on the outer periphery of the disk-shaped base metal at regular intervals, and a tip is integrally fixed to the tip of the saw blade by brazing or the like, both left and right edges of the tip flank By providing chamfered portions with the same width on each other, the horizontal upper edge of the center part in the width direction of the chip and the front side where the oblique edge blades are provided with the same width and the same inclination angle from both side edges of the upper edge blade to the left and right What formed the cutting blade called Fuji Yamagata is also known.

JP 2001-347421 A JP-A-10-263926 Japanese Utility Model 06-74228

  In the conventional tip saw described above, the tip is basically formed symmetrically when viewed from the front. Therefore, for example, when cutting a steel pipe, the steel pipe is clamped at two positions with a predetermined interval, and then a predetermined distance between them. When the steel pipe is cut with the tip saw abutting on the position, how the burrs are generated on the steel pipe cutting surfaces on both sides of the tip saw depends on the sharpness of the individual tip saw itself, the characteristics of the cutting machine or The actual situation is different depending on cutting conditions. For this reason, various unexpected burrs are generated and adhered to the cut surface of the steel pipe, and it takes time to remove the burrs, or the burrs are firmly fixed to the steel pipe to be a cut product and the steel pipe itself is There are various problems that the chips become defective or that the burrs adhering to the cut surface of the steel pipe come into contact with the chips and the chips are lost and the chipsaw itself must be replaced.

  An object of the present invention is to provide a tip saw that can control the occurrence of burrs on the cut surface of a workpiece when cutting a workpiece such as a steel pipe and can solve the above-mentioned various problems at once.

The present invention according to claim 1 is a tip saw in which a saw blade is formed at a predetermined interval on the outer periphery of a disk-shaped base metal, and the tip is integrally fixed to the tip of the saw blade. However, the shape is inclined left and right from the center of the blade width direction of the tip, and the inclined surfaces of the inclined surfaces are different from each other, thereby being asymmetrical left and right.

According to a second aspect of the present invention, in the tip saw according to the first aspect, the rake face of the tip has a shape in which the rake angle is inclined in the direction opposite to the tip saw rotation direction. .

According to a third aspect of the present invention, in the tip saw according to the second aspect, chamfered portions are formed on both sides of the rake face.

A tip saw according to a fourth aspect of the present invention is the tip saw according to the first to third aspects, wherein chamfered portions are formed on both sides of the tip flank.

  In the tip saw of the present invention, the tip flank of the tip has a shape that is inclined to the left and right from the center of the blade width direction of the tip, and the inclination angles of the inclined surfaces are different from each other, so that it is asymmetrical left and right. Therefore, when cutting a workpiece such as a steel pipe, either the right or left side of the tip of the tip of the tip will cut the workpiece first. As a result, it has a special advantage that the occurrence of burrs in the cutting operation can be controlled. For this reason, when cutting a steel pipe or the like, the product clamp side can be cut before the crop side, so that burrs are always generated on the cut end surface of the crop side. As a result, the burrs are cut off together with the crop in the steel pipe, and no burrs are left on the product clamp side. Therefore, the burrs generated at the time of cutting come into contact with the chips and the chips are lost or cut. The problem of becoming a defective product is definitely solved. Therefore, the cost, life and cutting efficiency of the tip saw itself in cutting a steel pipe can be greatly improved.

  Still further, according to the tip saw of the present invention, according to the cutting conditions of the steel pipe, by appropriately changing the left and right asymmetric shape on the tip tip flank, either one of the left and right cut surfaces cut by the tip saw. In addition to attaching burrs, it is also possible to uniformly generate fragile burrs that are easy to remove on both the left and right cut surfaces.

It is a partial side view which shows the basic form of a chip saw. It is an enlarged view of the saw blade part in the chip saw concerning Embodiment 1, (a) is a top view, (b) is a side view, (c) is a front view. It is sectional drawing which shows the cutting state of the steel pipe by the tip saw of Embodiment 1. FIG. It is an enlarged view of the saw blade part in the tip saw which concerns on Embodiment 2, (a) is a top view, (b) is a side view, (c) is a front view. It is an enlarged view of the saw blade part in the chip saw of Embodiment 3, (a) is a top view, (b) is a side view, (c) is a front view. It is an enlarged view of the saw blade part in the chip saw of Embodiment 4, (a) is a top view, (b) is a side view, (c) is a front view.

  Next, although embodiment of this invention is described according to drawing, this invention is not limited to each embodiment mentioned later.

  As shown in FIG. 1, the tip saw of each embodiment described below has the same basic structure. In other words, the saw saw 1 has saw blades 5 formed on the outer periphery of the disk-shaped base metal 2 at regular intervals, and a vertically long substantially plate-shaped cemented carbide tip 3 is brazed to a base 5 a at the tip of the saw blade 5. It has a basic structure.

  In the chip saw 1, each embodiment described below is applied to the chip 3.

  (Embodiment 1)

As shown in FIG. 2, the tip saw 21 according to this embodiment is configured so that the tip flank 23 a of the tip 23 fixed to the tip of the saw blade 25 in the disc-shaped base metal 22 has a blade width direction of the tip 23. The shape is inclined right and left from the center, and the inclined surfaces 24A and 24B are made asymmetrical by the inclination angles α1 and α2 being different from each other, and the rake face 26 has a flat shape. It is.

In the present embodiment, the angle α1 of the inclined surface 24A is set larger than the angle α2 of the inclined surface 24B, and the tip flank 23a has a clearance angle of θ1.

  In the figure, reference numerals 20A and 20B denote chips dividing grooves, which are alternately formed on the chip 23 on the outer periphery of the chip saw 21 one after another.

As shown in FIG. 3, according to the tip saw 21 according to the present embodiment, when the steel pipe P is cut, the inclined surface 24 </ b> A side with the large inclination angle α <b> 1 of the tip flank 23 a of the tip 23 is the crop side of the steel pipe P. By setting P1 and the inclined surface 24B side with a small inclination angle α2 as the clamp side (product side in this embodiment) P2, the cut surface S2 on the clamp side P2 in the pipe P is the cut surface on the crop side (cut-off side) P1. As a result, the burr PB is always generated on the cut surface S1 of the crop side P1, and as a result, the burr PB always falls together with the crop side P1 of the steel pipe P. ) P2 never remains.

(Embodiment 2)

  As shown in FIG. 4, the tip saw 31 according to this embodiment is configured so that the tip flank 33 a of the tip 33 fixed to the tip of the saw blade 35 in the disc-shaped base metal 32 has a blade width direction of the tip 33. The shape is inclined left and right from the center, and the inclined surfaces 34A and 34B have different inclination angles α3 and α4, so that the left and right sides are asymmetrical. The rake face 36 is opposite to the rotational direction of the tip saw 31. The shape is inclined in the direction.

  In the present embodiment, the angle α3 of the inclined surface 34A is set larger than the angle α4 of the inclined surface 34B, and the tip flank 33a has a clearance angle of θ2.

  (Embodiment 3)

  As shown in FIG. 5, the tip saw 41 according to this embodiment is configured so that the tip flank 43 a of the tip 43 fixed to the tip of the saw blade 45 in the disc-shaped base metal 42 has a blade width direction of the tip 43. The shape is inclined left and right from the center, and the inclined surfaces 44A and 44B have different inclination angles α6 and α7, so that they are asymmetrical. The rake face 46 is in a direction opposite to the rotational direction of the tip saw 41. A chamfered portion 46 a is formed on both sides of the rake face 46.

  In the present embodiment, the angle α6 of the inclined surface 44A is set larger than the angle α7 of the inclined surface 44B, and the tip flank 43a has a clearance angle of θ3.

  (Embodiment 4)

  As shown in FIG. 6, the tip saw 51 according to this embodiment is configured so that the tip flank 53 a of the tip 53 fixed to the tip of the saw blade 55 in the disc-shaped base metal 52 has a blade width direction of the tip 53. The shape is inclined left and right from the center, and the inclined surfaces 54A and 54B have different inclination angles α8 and α9 so that they are asymmetrical and chamfered portions 57 are formed on both sides of the tip flank 53a. Further, the rake face 56 has a shape inclined in the direction opposite to the rotation direction of the tip saw 51.

  In the present embodiment, the angle α8 of the inclined surface 54A is set larger than the angle α9 of the inclined surface 54B, and the tip flank 53a has a clearance angle of θ4.

  The tip saw of the present invention can control the occurrence of burrs, and has a tip wear suppression effect and a steel pipe crop contact prevention effect, etc. Since it becomes possible to greatly increase the efficiency of the cutting work, it can be expected to be widely used in the field of this kind of tip saw.

1 Chip saw 2 Base metal 3 Hard tip 4A / 4B Chamfer

Claims (4)

  In a tip saw in which a saw blade is formed at a predetermined interval on the outer periphery of the disk-shaped base metal, and the tip is integrally fixed to the tip portion of the saw blade, the tip flank surface is from the center of the tip width direction of the tip. A tip saw that has a shape that is inclined to the left and right and that is asymmetrical by the inclination angles of the inclined surfaces being different from each other.   The tip saw according to claim 1, wherein the rake face of the tip has a shape in which a rake angle is inclined in a direction opposite to a tip saw rotation direction.   The chip saw according to claim 2, wherein chamfered portions are formed on both sides of the rake face.   The tip saw according to any one of claims 1 to 3, wherein chamfered portions are formed on both sides of the tip clearance surface of the tip.

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