JP2008006530A - Tip saw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce frictional resistance of outer peripheral flank and lateral flank, and to effectively prevent chipping of a tip. <P>SOLUTION: In this tip saw 1, the tip 5 is fixed to each tooth bed 4 of sawteeth 3 formed at fixed intervals on an outer periphery of base metal 2. In the tip 5, the outer peripheral flank 6 at the top is constituted of a first flank 6a on a front side (blade tip side) and a second flank 6b on a rear side having relief angles α1 and α2 different with each other, respectively. By making the first flank 6a to have the relief angle α1 smaller by a prescribed length from a front edge of the tip 5, chipping of the blade tip is prevented. The second flank 6b is made to have the relief angle α2 larger than the relief angle α1 of the first flank 6a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tip saw used for cutting various materials such as steel pipes.

Conventionally, as a tip saw for cutting a steel pipe, for example, as shown in FIGS. 13 and 14, a tip saw having a tip (61) having an outer peripheral flank (62) inclined toward both sides from the width center portion (62 a) ( 60) is known. In the tip (61), the outer peripheral flank (62) is set to a predetermined clearance angle in consideration of the material and thickness of the steel pipe cut by the tip saw (60), cutting efficiency, and the like. Specifically, in the case of a steel pipe having a relatively high hardness, the clearance angle is reduced, and in the case of a steel pipe having a relatively low hardness, the clearance angle is increased.
JP 2004-351578 A

  However, in the cutting work by the tip saw (60), as described above, when the clearance angle of the outer peripheral flank (62) is small, the tip (61) is hardly chipped, but the friction of the outer peripheral flank (62) As the resistance increases, wear and roughness of the chip (61) (heat cracks due to frictional heat) are promoted. On the other hand, when the clearance angle of the outer peripheral flank (62) is large, contrary to the above, the frictional resistance of the outer peripheral flank (62) is reduced and the wear and roughness of the tip (61) are suppressed, The chip (61) is easily chipped. Therefore, it is very difficult to properly set the clearance angle of the outer peripheral flank (62), and any of the above-described problems is likely to occur. Further, as shown in FIG. 15, this is the same in the tip saw (70) in which the chip dividing groove (63) is formed on the outer peripheral flank (62).

  In addition, as shown in FIG. 16, the applicant applies the rear side from the front end side to the side corners formed by the both side edges of the outer peripheral flank (72) of the tip (75) and the outer peripheral edge of the side flank (73). A tip saw (71) having a chamfered portion (74) tapered toward the end side has been developed. According to the tip saw (71), the contact area between the material to be cut such as a steel pipe to be cut and the side flank (73) is reduced, and wear and chipping of the tip (75) are prevented. There was still room for improvement in setting the appropriate clearance angle for the surface (72).

  The object of the present invention is to reduce the frictional resistance of the peripheral flank and lateral flank by reducing the clearance angle at the peripheral flank in two stages, and to effectively prevent chip chipping due to heat cracks caused by frictional heat. It is to provide a tip saw that can.

  According to the first aspect of the present invention, there is provided a chip saw in which a sawtooth is formed on the outer periphery of a disk-shaped base metal at a predetermined interval, and a tip is fixed to the sawtooth. And the second flank, the first flank is formed in front of the second flank, and the flank angle of the second flank is set larger than the flank angle of the first flank. .

  According to a second aspect of the present invention, in the tip saw according to the first aspect, the first flank is an inclined surface that descends in both directions from the center of the top of the chip, and the second flank is the trailing edge of the first flank. It is an inclined surface that descends backward from the part.

  According to a third aspect of the present invention, in the tip saw according to the first aspect, the first flank is a triangular flat surface when viewed from a plane formed at the center of the tip front edge, and the second flank (26b) Is an inclined surface descending to both sides from the center of the chip.

  The present invention as defined in claim 4 is characterized in that, in the tip saw according to any one of claims 1 to 3, the clearance angle of the first flank is in the range of 5 to 15 °. Is. This is because when the clearance angle is less than 5 °, the frictional resistance against the workpiece becomes too large, whereas when the clearance angle exceeds 15 °, the tip (blade edge) tends to be chipped. Furthermore, the clearance angle of the first flank is more preferably in the range of 8 to 12 °.

  According to a fifth aspect of the present invention, in the tip saw according to any one of the first to fourth aspects, the length of the first flank is in the range of 0.15 to 1.5 mm. It is a feature. This is because if the length of the first flank is less than 0.15 mm, the tip of the tip (cutting edge) tends to be chipped, whereas if the length exceeds 1.5 mm, the frictional resistance against the work material becomes too large. It is. The length of the first flank is more preferably in the range of 0.3 to 0.6 mm.

  The present invention provides a saw having saw blades formed at regular intervals on the outer periphery of a disk-shaped base metal, and a tip is fixed to the saw teeth. The first flank is formed in front of the second flank, and the flank angle of the second flank is set to be larger than the flank angle of the first flank. By making the second flank larger than the first flank, the contact area between the work material and the side flank can be greatly reduced compared to the conventional case. The frictional resistance is greatly reduced, and as a result, there is a special effect that chip roughening and wear are effectively suppressed.

  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.

  (Embodiment 1)

  The tip saw (1) of the present embodiment is an application of the present invention to the conventional tip saw (60) shown in FIGS. 13 and 14, and as shown in FIGS. A tip (5), which will be described later, is fixed to a tooth base (4) of a saw tooth (3) formed at a predetermined interval on the outer periphery of the above.

  That is, the tip (5) has a front flank (blade side) first flank (6a) and a rear second flank (6b) in which the outer peripheral flank (6) at the top has different flank angles α1 and α2. ). Specifically, the first flank (6a) is an inclined surface that descends from the central portion (7) in both directions, and the second flank (6b) is an inclined surface that descends rearward from the rear edge. It has been. In this embodiment, the length (L) of the central portion (7) on the first flank (6a) is in the range of 0.3 to 0.6 mm, and the flank angle α1 of the first flank (6a). In this embodiment, the range is 8 to 12 °, and the clearance angle α2 of the second flank (6b) is 9 ° or more, which is larger than the clearance angle α1 of the first flank (6a).

  In addition, (13) in the figure indicates the side clearance surface of the tip (5).

  A tip saw (10) shown in FIG. 4 is a modification of the tip saw (1) according to the present embodiment, and the first relief is provided at a portion closer to one side of the outer peripheral flank (6) of the tip (5). A chip dividing groove (11) is formed from the surface (6a) to the front portion of the second flank (6b). The chip dividing grooves (11) are alternately formed on the left and right sides of adjacent chips (10) on the outer periphery of the base metal (2). In addition, in the present embodiment, the chip dividing groove (11) is provided for one chip (5), but may be provided for two chips.

The life test of the tip (5) in the tip saw (10) according to the present embodiment will be described. When the specification is φ380 × 52Z (base material = alloy tool steel, tip = carbide tip), the conventional type shown in FIG. The tip saw (70) and the tip saw (10) according to this embodiment were tested under the following conditions. That is, the test was performed on the rotational speed = 250 RPM, the saw feed speed 1950 mm / min, and the work material = STKM (steel pipe) 200 × 200 × 12.0 t. As a result, the cutting life was 1.5 m ² for the conventional tip saw (70), but 1.95 m ² for the tip saw (10) of this embodiment. A significant increase in the lifetime of (10) was confirmed.

  (Embodiment 2)

As shown in FIGS. 5 to 7, the tip saw (21) of the present embodiment is the same as that of the first embodiment, except that the present invention is applied to the conventional tip saw (60) seen in FIGS. 13 and 14. Since the basic structure is the same as that of the first embodiment, the description is omitted by giving the same reference numerals.
In this embodiment, the outer peripheral flank (26) of the tip (25) has a triangular first flank (26a) and a central part (27) on both sides from the plane formed at the center of the front edge. It is composed of a second flank (26b) composed of a descending inclined surface, and the length (L) of the first flank (26a) is also in the range of 0.15 to 1.5 mm in this embodiment, In this embodiment, the clearance angle α1 of the first flank (26a) is in the range of 5 to 15 °, and the clearance angle α2 of the second flank (26b) is the clearance angle α1 of the first flank (6a). It is made with a larger angle.

  The tip saw (30) shown in FIG. 8 is a modification of the tip saw (21) according to the present embodiment, and is a second flank in a portion closer to one side of the outer peripheral flank (26) of the tip (25). A chip dividing groove (22) is formed rearward from the front end portion of (26b). The chip dividing grooves (22) are alternately formed on the left and right sides of adjacent chips (25) on the outer periphery of the base metal (2). Further, there are cases where two chips for dividing chips are provided, and this is the same in the embodiments described later.

  (Embodiment 3)

As shown in FIGS. 9 and 10, the basic structure of the tip saw (31) of the present embodiment is also the same as that of the first embodiment, and the description is omitted by giving the same reference numerals.
In this embodiment, the outer peripheral flank (36) of the tip (35) has a substantially rectangular shape when viewed from the first flank (36a) having a rectangular shape when viewed from the plane formed on the front side and the plane formed at the rear side. Of the first flank (36b), the length (L) of the first flank (36a) is in the range of 0.15 to 0.6 mm in the present embodiment, the first flank ( In this embodiment, the clearance angle α1 of 36a) is in the range of 8 to 12 °, and the clearance angle α2 of the second clearance surface (36b) is larger than the clearance angle α1 of the second clearance surface (36a). ing.

  (Embodiment 4)

As shown in FIGS. 11 and 12, the basic structure of the tip saw (41) of the present embodiment is the same as that of the first embodiment, and the description thereof is omitted by attaching the same reference numerals.
In this embodiment, the outer peripheral flank (46) of the tip (45) is a first flank (46a) comprising a central flat part (42) and an inclined surface (43) descending from the flat part (42) to both sides. And a second flank (46b) that is substantially square when viewed from the plane formed on the rear side, and the length (L) of the flat portion (42) on the first flank (46a) is 0. In this embodiment, the clearance angle α1 of the first clearance surface (46a) is in the range of 8 to 12 °, and the clearance angle α2 of the second clearance surface (46b) is the first clearance angle α2. The angle is larger than the clearance angle α1 of the second clearance surface (46a).
In the figure, (44) indicates a chip dividing groove.

  According to the present invention, chipping can be effectively prevented, and the frictional resistance against the work material is reduced, so that chip roughening and wear can be effectively prevented. Therefore, the present invention can be widely used for cutting various work materials. Can be expected.

It is a perspective view of the blade part in the tip saw of Embodiment 1. It is a top view of the chip | tip used in the embodiment. It is a side view of the chip. It is a perspective view of the blade body part in the tip saw which shows the modification of Embodiment 1. It is a perspective view of the blade part in the tip saw of Embodiment 2. It is a top view of the chip | tip used in the embodiment. It is a side view of the chip. It is a perspective view of the blade body part in the tip saw which shows the modification of Embodiment 2. It is a perspective view of the blade part in the tip saw of Embodiment 3. It is a side view of the chip | tip used in the embodiment. It is a perspective view of the blade part in the tip saw of Embodiment 4. It is a side view of the chip | tip used in the embodiment. It is a perspective view of the blade body part in the tip saw which shows a prior art example. It is an ancestorless view of the chip in the conventional example. It is a perspective view of the blade part in other conventional examples. It is a perspective view of the blade part in the tip saw which shows other conventional examples.

Explanation of symbols

(1) Tipsaw
(2) Deposit
(3) Sawtooth
(4) Tooth base
(5) Chip
(6) Outer peripheral flank
(6a) First flank
(6b) Second flank
(7) Central part of the first flank

Claims (5)

  In a tip saw in which a sawtooth is formed at a constant interval on the outer periphery of a disk-shaped base metal, and a tip is fixed to the sawtooth, the outer peripheral flank of the tip has a first flank and a second flank. A tip saw in which the first flank is formed in front of the second flank and the flank angle of the second flank is set larger than the flank angle of the first flank.   The tip saw according to claim 1, wherein the first flank is an inclined surface that descends in both directions from the center of the top of the tip, and the second flank is an inclined surface that descends backward from the rear edge of the first flank.   The first relief surface is a triangular flat surface as viewed from the plane formed at the center of the tip front edge, and the second relief surface (26b) is an inclined surface that descends from the tip center to both sides. Tip saw.   The tip saw according to any one of claims 1 to 3, wherein a clearance angle of the first flank is in a range of 5 to 15 °.   The tip saw according to any one of claims 1 to 4, wherein the length of the first flank is in the range of 0.15 to 1.5 mm.

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