JP5607451B2 - Parting-off tool - Google Patents

Description

  The present invention relates to a parting tool which is mounted on a cutting machine such as a lathe and used for cutting steel pipes such as seamless steel pipes, cutting various bars, or grooving.

  As shown in FIG. 1, a parting tool 1 is formed by joining a hard tip 3 to a tip 2a of a plate-shaped base metal 2 (shank) having a predetermined length by brazing or the like, as shown in FIG. The side surfaces 6 (lateral clearance surfaces) of the hard chip 3 are provided with an inclination α1 (radial angle) so that the width gradually decreases from the front end portion 6a toward the base portion 6b, and as shown in FIG. Further, both side surfaces 6 of the hard tip 3 are provided with an inclination α2 (tangential angle) so that the width gradually decreases from the front portion 5a toward the rear portion 5b. W is thicker than the thickness t of the base metal 2, and the thickness t of the base metal 2 is the same over its entire length.

  When cutting the steel pipe with the above-described parting tool 1, as shown in FIG. 4, the parting tool 1 is set on a chuck (not shown) of a cutting machine such as a lathe and the steel pipe P is clamped. 7, the cutting edge 1 a of the hard tip 3 of the parting tool 1 is brought into contact with the outer peripheral surface PF from the direction perpendicular to the outer peripheral surface PF while the steel pipe P is oriented in the circumferential direction. Cutting was completed when the cutting edge 3a cut the entire thickness of the steel pipe P.

JP 2001-150205 A

  As shown in FIG. 5, the parting tool 1 described above is generally symmetric with respect to the chamfers 8A and 8B on the left and right sides of the chip 3 in the widths W1 and W2 and the inclination angles α3 and α4. Surface 10 was horizontal. However, when the steel pipe P is cut by the parting tool 1 having such a structure, the inner peripheral portion of the steel pipe P is completely pierced by the parting tool 1 when the final cutting of the steel pipe P is completed. As a result, substantially C-shaped burrs occurred on the cut surfaces S1 and S2 of the steel pipe P. And when this burr | flash has generate | occur | produced in the cut surface S1 of the cut-off part P1 (henceforth "crop") of the front end side when the steel pipe P is cut | disconnected, a burr | flash also protrudes with fall of this crop side P1. Since the burr does not collide with the cut-off tool 1 because it is separated from the cutting tool 1, it is clamped when the burr occurs on the cut surface S2 on the opposite side of the crop P1, that is, on the clamp P2 side of the steel pipe P. The steel pipe P continues to rotate for a while even after the cutting machine is stopped, and during that time, the burrs continuously hit the adjacent parting tool 1 many times, and as a result, the parting tool 1 is lost. There was a problem.

  The purpose of the present invention is to ensure that, when cutting steel pipes and the like, burrs are always generated on the cut end face on the crop side, and the burrs are not generated on the cut end face on the clamp side of the steel pipe, thereby preventing defects. The purpose is to provide a parting-off tool that has been made possible.

The present invention according to claim 1 is a parting tool having a substantially plate-shaped base metal and a chip joined to the tip of the base metal, and chamfers are formed on both sides of the tip of the chip, and the chamfers are formed. This is a parting tool that is asymmetrical so that it cuts faster on the clamp side than on the crop side of the workpiece.

  The parting tool in the present invention includes a so-called throw-away type tool in which the chip is fixed to the base metal with a screw or is inserted into the base metal as well as the chip is brazed integrally with the base metal. It is.

According to a second aspect of the present invention, in the parting tool according to the first aspect, the chip is made asymmetric by making the chamfer width of the chip wider on the crop side than on the clamp side.

According to a third aspect of the present invention, in the cut-off tool according to the first or second aspect, the tip is made asymmetric by making the chamfer angle of the tip larger than that on the clamp side. It is what.

According to a fourth aspect of the present invention, in the parting tool according to the second or third aspect, the chamfered shape of the chip is linear.

According to a fifth aspect of the present invention, in the parting tool according to the second or third aspect, the chamfered shape of the chip is an R shape.

According to a sixth aspect of the present invention, in the cut-off tool according to the second or third aspect, the chamfered shape of the chip is linear on one side and rounded on the other side.

In the seventh aspect of the present invention, in the parting tool according to any one of the first to sixth aspects, the parting surface is an inclined surface that is lowered from the clamp side toward the crop side. It is characterized by being.

  According to the parting tool of the present invention, when cutting a steel pipe or the like, the clamp side is cut off before the crop side, so that a burr always occurs on the cut end surface on the crop side. As a result, the tip of the tool is not lost due to burrs generated when cutting a steel pipe or the like as in the prior art.

It is a side view which shows the basic form of a parting tool. It is a front view of the byte. It is a top view of the byte. It is a front view which shows the cutting state of the steel pipe by the same byte. It is a front view which shows the conventional blade-tip shape in a parting tool. It is a front view which shows the cutting state of the steel pipe by the parting tool which concerns on Embodiment 1. FIG. FIG. 7 is an enlarged front view of a tip end portion of the cutting tool of FIG. 6. It is a front view which shows the cutting state of the steel pipe by the parting tool which concerns on Embodiment 2. FIG. FIG. 9 is an enlarged front view of a tip end portion of the cutting tool of FIG. 8. It is a front view which shows the cutting state of the steel pipe by the parting tool which concerns on Embodiment 3. FIG. It is a front view which shows the cutting state of the steel pipe by the parting tool which concerns on Embodiment 4. FIG. It is a front view of the parting tool according to the fifth embodiment. FIG. 13 is an enlarged front view of a tip end portion of the parting tool of FIG. 12. It is a front view of the parting tool according to the sixth embodiment. FIG. 15 is an enlarged front view of a tip end portion of the parting tool of FIG. 14.

  Next, embodiments of the present invention will be described with reference to the drawings. There are various types of parting tools depending on workpieces, cutting conditions, and the like, and the present invention is not limited to these embodiments.

  The overall form of the parting tool is the same as that described in FIGS. Each embodiment described below is applied to the hard chip 3.

  (Embodiment 1)

  As shown in FIGS. 6 and 7, the parting tool 21 that penetrates the peripheral wall of the steel pipe P has left and right linear chamfers 24 </ b> A formed on both sides of the cutting edge of the hard tip 23 fixed to the tip part thereof. -The formation form of 24B is different from each other so that it is asymmetrical.

  That is, in the tip 23, the width W1 of the left chamfer 24A that becomes the crop side P1 of the steel pipe P is wider than the width W2 of the right chamfer 24B that becomes the clamp side (product side in this embodiment) P2 of the steel pipe P. ing.

  On the other hand, the inclination angle α3 of the left chamfer 24A and the inclination angle α4 of the right chamfer 24B are set to be the same, and the parting surface 22 is horizontal.

  In this embodiment, as described above, in the tip 23, the width C1 of the left chamfer 24A that becomes the crop side P1 of the steel pipe P is set to the right chamfer that becomes the clamp side (product side in this embodiment) P2 of the steel pipe P. By making the width wider than the width W2 of 24B, the cut surface S2 of the clamp side P2 in the pipe P is cut earlier than the cut surface S1 of the crop side (cut-off side) P1, and as a result, the substantially C-shaped burr PB is The burrs PB always fall on the cutting surface S1 on the crop side P1, and therefore the burrs PB fall together with the crop side P1 of the steel pipe P. Therefore, the burrs PB do not come into contact with the tips 23 of the parting tool 21 and the chip 23 is missing. Is reliably prevented.

  (Embodiment 2)

  As shown in FIGS. 8 and 9, the parting tool 31 according to the present embodiment includes a left and right linear chamfers 34 </ b> A and 34 </ b> B formed on both sides of the cutting edge of the hard tip 33 fixed to the tip thereof. And the angle of the cut-off surface 32 (the tangential angle between the tip flank and the rake face) are asymmetrical.

  That is, in the tip 33, the width W1 of the left chamfer 34A that becomes the crop side P1 of the steel pipe P is wider than the width W2 of the right chamfer 34B that becomes the clamp side (product side in this embodiment) P2 of the steel pipe P. In addition, the cut-off surface 32 of the tip 33 is inclined to the left from the right side.

  In the present embodiment, the inclination angle α3 of the left chamfer 34A is set to be the same as the inclination angle α4 of the right chamfer 34B.

  And in this embodiment, by making the structure of the cutting tool 31 as described above, the cutting surface S2 on the clamp side P2 in the pipe P is cut earlier than the cutting surface S1 on the crop side (cut-off side) P1, and as a result The substantially C-shaped burr PB is always generated on the cut surface S1 of the crop side P1, and therefore the burr PB falls together with the crop side P1 of the steel pipe P, so that the burr PB contacts the tip 33 of the parting tool 31. The chip 33 is reliably prevented from being lost.

In this embodiment, the width W1 of the left chamfer 34A that becomes the crop side P1 of the steel pipe P is wider than the width W2 of the right chamfer 34B that becomes the clamp side (product side in this embodiment) P2 of the steel pipe P. In addition, the chip 33 is prevented from being chipped by inclining the cut-off surface 32, but the above-described chamfering widths W1 and W2 are asymmetrical or the angle of the cut-off surface 32 is inclined. The same effect can be obtained by either method.

  (Embodiment 3)

  As shown in FIG. 10, the parting tool 41 of the present embodiment is a part of the parting tool 21 of the first embodiment, with the left and right chamfers being rounded, and the other points are the same as in the first embodiment. It is.

  That is, in the hard tip 43 of the cut-off tool 41, the left and right chamfers 44A and 44B of the cutting edge are R-shaped, and the width of the left side (crop P1 side) chamfer 44A is the right side (clamp P2 side) chamfer 44B. It is made wider than the width of.

  Also in the cut-off tool 41 of the present embodiment, the cutting surface S2 on the clamp side P2 of the steel pipe P is cut earlier than the cutting surface S1 on the crop side (cut-off side) P1, and as a result, a substantially C-shaped burr PB is always obtained. Since the burr PB is generated together with the crop side P1 of the steel pipe P, the burr PB does not contact the chip 43 of the parting tool 41, and the chip 43 is surely broken. To be prevented.

  (Embodiment 4)

  As shown in FIG. 11, the parting tool 51 of the present embodiment has an R-shaped chamfer on the left and right sides in the parting tool 31 of the second embodiment, and the other points are the same as those of the second embodiment. It is.

  That is, in the hard tip 53 of the parting tool 51, the left and right chamfers 54A and 54B at the cutting edge thereof are respectively R-shaped, and the width of the left chamfer 54A is wider than the width of the right chamfer 54B. In addition, the cut-off surface 52 of the chip 53 is inclined so as to be lowered from the right side to the left side.

  Also in the cut-off tool 51 of the present embodiment, the cutting surface S2 on the clamp side P2 in the steel pipe P is cut earlier than the cutting surface S1 on the crop side (cut-off side) P1, and as a result, a substantially C-shaped burr PB is always obtained. Since the burr PB is generated on the cut surface S1 of the crop side P1, and the burr PB falls together with the crop side P1 of the steel pipe P, the burr PB does not contact the chip 53 of the parting tool 51, and the chip 53 is surely lost. To be prevented.

  In the embodiment described above, the left and right chamfers of the hard chips 23, 33, 43, 53 of each parting tool 21, 31, 41, 51 are either linear or R-shaped, but one of them is a straight line. And the other may be R-shaped.

  (Embodiment 5)

  As shown in FIGS. 12 and 13, in the cut-off tool 61 of the present embodiment, the inclination angle α3 of the chamfer 64A on the left side (crop side) is the inclination angle of the chamfer 64B on the right side (clamp side). That is, it is set larger than α4, that is, the left chamfer 64A is asymmetrical by making it steeper than the right chamfer 64B.

  In this embodiment, the width W1 of the left chamfer 64A that is the crop side of the steel pipe and the width W2 of the right chamfer 64B that is the clamp side of the steel pipe (product side in this embodiment) are the same width, and are parting off. The surface 62 is not inclined and is horizontal.

  The cut-off tool 61 of this embodiment is such that the clamp side of the steel pipe is cut off before the crop side as in the above-described embodiment only by making the angles of the left and right chamfers 64A and 64B different from each other. It is.

  (Embodiment 6)

  As shown in FIGS. 14 and 15, the parting tool 71 of the present embodiment is configured such that, in the hard tip 73, the inclination angle α3 of the left chamfer 74A is set larger than the inclination angle α4 of the right chamfer 74B, and The width W1 of the left chamfer 74A that becomes the crop side P1 of the steel pipe P is wider than the width W2 of the right chamfer 74B that becomes the clamp side (product side in this embodiment) P2 of the steel pipe P. The cut-off surface 72 is horizontal.

  The cut-off tool 71 of the present embodiment can provide the same effects as the cut-off tool of each of the embodiments described above.

  As described above, in the hard tip of the parting tool, the clamp side P2 in the steel pipe P can be achieved by performing at least one of the width of the left and right chamfers and the left-right asymmetry of the inclination angle or the inclination of the parting surface. The cut surface S2 is cut earlier than the cut surface S1 on the crop side (cut-off side) P1, and as a result, the chipping of the hard chip is surely prevented.

  The parting tool of the present invention is reliably prevented from being broken by burrs generated when cutting steel pipes and the like, and can greatly extend the life compared to conventional parting tools. Can be expected to be used widely.

1 Parting tool 2 Base metal 3 Hard tip 24A / 24B Chamfering

Claims (7)

In a parting tool having a substantially plate-shaped base metal and a chip bonded to the tip of the base metal , chamfers are formed on both sides of the cutting edge of the chip, and these chamfers are located closer to the clamp side than the crop side of the workpiece. Cut-off tool that is asymmetrical so that it can be cut quickly.   The parting tool according to claim 1, wherein the chip is made asymmetric by making the chamfer width of the chip wider on the crop side than on the clamp side.   The parting-off tool according to claim 1 or 2, wherein the chip is made asymmetric by setting the chamfering angle of the chip to be larger on the crop side than on the clamp side.   The parting tool according to claim 2 or 3, wherein the chamfered shape of the chip is a straight line.   The parting tool according to claim 2 or 3, wherein the chamfered shape of the chip is R-shaped.   The parting tool according to claim 2 or 3, wherein a chamfered shape of the chip is linear on one side and R-shaped on the other side.   The parting tool according to any one of claims 1 to 6, wherein the parting surface is an inclined surface that is lowered from the clamp side toward the crop side.

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