JP2000024807A - Chip breaker for rotary cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To widen the effective range of the chip flowing direction by a chip breaker by forming the chip breaker provided on a rotary cutting tool and breaking chips in contact with chips into a rectangle pole or a square pole. SOLUTION: A chip breaker 13 of a triangle pole is provided on the rotating button tool 12 of a rotary cutting tool 11. When a work 14 is lathe-cut by the rotary cutting tool 11, chips 15 are brought into contact with one of three column faces of the chip breaker 13 and are folded and broken. The flowing direction 16 of the chips 15 and the directions of the normal lines of column faces where the chips 15 are kept in contact with the chip breaker 13 coincide with each other three times while the button tool 12 is rotated once. The chips 15 can be broken three times while the button tool 12 is rotated once.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip breaker provided on a rotating tool for breaking chips.

[0002]

2. Description of the Related Art FIG. 9 shows a state of turning by a rotary cutting tool provided with a conventional chip breaker. As shown in the drawing, a columnar (or conical) chip breaker 3 is provided on a rotating round bit 2 of a rotary bit 1. When the workpiece 4 is turned by the rotating tool 1,
Chip 5 is the cylindrical surface (or conical surface) of chip breaker 3
And is bent and broken.

In order to break the chip 5 by bending it with the chip breaker 3, as shown in FIG. 10, the flow direction 6 of the chip 5 when viewed from directly above the round bit 2 and the chip 5 It is necessary to reduce the difference 8 in the angle between the normal direction 7 and the direction of the part corresponding to the angle. For example, FIG.
As shown in FIG. 1, when the difference 8 between the direction 6 in which the chips 5 flow and the direction 7 of the normal to the portion where the chips 5 hit the chip breaker 3 is large, the chips 5 are placed on the cylindrical surface of the chip breaker 3. Chips 5 do not break.

[0004]

Generally, since the direction 6 in which the chips 5 flow varies greatly depending on the processing conditions, the processing conditions under which the chip 5 is broken by the columnar (or conical) chip breaker 3 are certain specific conditions. Is limited to Therefore, the conventional columnar (or conical) chip breaker 3 has a problem that its versatility with respect to processing conditions is low.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a rotary tool tip breaker having high versatility with respect to processing conditions.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a chip breaker provided on a rotating cutting tool, which breaks chips by contacting the chips, and forms a triangular prism or a quadrangular prism. It is characterized by being.

In order to achieve the above object, the present invention provides a chip breaker which is provided on a rotating cutting tool and breaks chips by contacting the chips. Is provided. The polygon is a triangle, a quadrangle, a pentagon, or a hexagon.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 show a schematic configuration of a rotary bit chip breaker according to a first embodiment of the present invention.

As shown in FIG. 1, a triangular prism-shaped chip breaker 13 is provided on a rotating round bit 12 of a rotary bit 11. When the workpiece 14 is turned by the rotating cutting tool 11, the chip 15 comes into contact with any one of the three pillar surfaces of the chip breaker 13, and is bent and broken. That is, while the circular cutting tool 12 makes one rotation, the direction 16 in which the chips 15 flow and the chips 15
There are three places where the direction of the normal to the column surface of the part corresponding to 3 coincides. Therefore, the chip 15 can be broken three times while the round bit 12 makes one rotation.

As shown in FIG. 2, even when the direction 16 in which the chips 15 flow is different from the direction shown in FIG. 1, the chip breaker 13 in the form of a triangular prism is rotated together with the round bit 12 so that the chips are rotated. There are places where the direction 16 in which the flow 15 flows and the direction of the normal line coincide. That is, as shown in FIG. 3, when the chip breaker 13 having a triangular prism shape is used, if the direction 16 in which the chips 15 flow is within the range 18,
The chip 15 can be broken three times while the round bit 12 makes one rotation.

FIG. 4 shows a schematic configuration of a rotary bit tip breaker according to a second embodiment of the present invention.

As shown in FIG. 4, a square columnar chip breaker 21 is provided on the rotating round bit 12 of the rotary bit 11. When the workpiece 14 is turned by the rotary cutting tool 11, the chip 15 comes into contact with any one of the four pillar surfaces of the chip breaker 21 and is bent and broken. That is, the direction in which the chips 15 flow while the circular cutting tool 12 makes one rotation, and the chips 15
There are four places where the direction of the normal to the column surface of the portion corresponding to 1 coincides. Therefore, the chip 15 can be broken four times while the round bit 12 makes one rotation.

A range 22 in the direction 16 in which the chips 15 flow in which the chip breaker 21 having a square pillar effectively acts is narrower than a range 18 (see FIG. 3) of the chip breaker 13 having a triangular prism shape. Since the number of pillar surfaces of the breaker 21 is four, the chip 15 can be broken four times while the round bit 12 makes one rotation. Therefore, the size of the broken chips can be reduced as compared with the triangular prism-shaped chip breaker 13 (see FIG. 1), and the labor for the subsequent chip processing can be reduced.

In this case, the comparison was made between the chip breaker 13 having a triangular prism shape and the chip breaker 21 having a quadrangular prism shape.
The size of the circumscribed cylinder is the same (for example, the same as the columnar chip breaker 3 shown in the related art).

When the number of prisms is further increased, the range of the direction in which the chip breaker effectively acts in the flowing direction of the chips becomes narrower, but the size of the broken chips becomes smaller. However, even if the number of corners is increased, there is a limit to the length of broken chips, and the minimum value is the length when a cylindrical chip breaker is used.

Next, a specific experimental example using the conventional columnar chip breaker 3, triangular columnar chip breaker 13, and quadrangular columnar chip breaker 21 will be described.

When a cylindrical chip breaker with a diameter of 25 mm is attached to a rotating tool with a diameter of 32 mm, when a chip breaker with a triangular prism having a circle with a diameter of 25 mm is circumscribed is attached, a circle with a diameter of 25 mm is circumscribed. 200 mm in diameter and 300 mm in length when a square-shaped chip breaker with a circle is installed
When the outer periphery of the carbon steel for machine structural use (S54C) was turned by a lathe, the chip breaking property was evaluated. Cutting speed is
100 mm / min, depth of cut 0.5 mm, feed rate 0.2 mm / rev, dry cutting. The rotating tool was arranged so that the parallel rake of the round bit was 0 ° and the vertical rake angle was 30 °.

FIG. 5 shows the experimental results. The horizontal axis in the graph in FIG. 5 indicates the shape or shape of the chip breaker, and the vertical axis indicates the average length of the chips when each chip breaker is used.

As shown in the figure, the chips were not broken in the cylindrical chip breaker, but were continuous chips. On the other hand, in the triangular prism chip breaker and the quadrangular prism chip breaker, the chips were broken at a length of 50 mm or less. Also,
The chip length when using the quadrangular prism-shaped chip breaker was shorter than the chip length when using the triangular prism-shaped chip breaker.

Therefore, by using the triangular-shaped chip breaker 13 and the quadrangular-shaped chip breaker 21, the range of the direction in which the chips can flow, in which the chip breaker is effective, is wider than that of the cylindrical chip breaker. The range of processing conditions under which the chip breaker is effective is wider than that of the breaker.

The third and fourth embodiments of the present invention will be described with reference to FIGS.
An embodiment will be described. FIG. 6 is a schematic configuration showing a chip breaker of a rotating tool according to a third embodiment of the present invention;
FIG. 7 shows a schematic configuration showing a chip breaker of a rotating tool according to a fourth embodiment of the present invention.

As shown in FIG. 6, a chip breaker 32 having a polygonal (hexagonal) column shape and having a linear concave portion 31 on each column surface is provided on the rotating round bit 12 of the rotary bit 11. Have been. When the workpiece 14 is turned by the rotary cutting tool 11, the chip 15 comes into contact with one of the six straight concave portions 31 of the chip breaker 32, and is bent and broken. Therefore, it is possible to reduce the size of the broken chips without narrowing the range in which the chips 15 in which the chip breaker is effective flow.

As shown in FIG. 7, a chip breaker 42 having a polygonal (hexagonal) column shape and having a curved concave portion 41 on each column surface is provided on the rotating round bit 12 of the rotary bit 11. Have been. When the workpiece 14 is turned by the rotating tool 11, the chip 15 comes into contact with one of the six curved concave portions 41 of the chip breaker 42, and is bent and broken. Therefore, it is possible to reduce the size of the broken chips without narrowing the range in which the chips 15 in which the chip breaker is effective flow.

In FIGS. 6 and 7, the polygonal column is a hexagon, but the polygon may be a triangle, a quadrangle or a pentagon.

Next, a hexagonal column-shaped chip breaker, a chip breaker 32 provided with a straight recess 31 and a curved recess 41
A specific example of an experiment using the chip breaker 42 provided with is described.

When a hexagonal column-shaped chip breaker having a circle having a diameter of 25 mm as a circumscribed circle is attached to a rotating tool having a diameter of 32 mm, and six linear concave portions 31 having a circle having a diameter of 25 mm as a circumscribed circle are provided.
When the chip breaker 32 provided with
When a chip breaker 42 provided with six curved concave portions 41 having a circle having a diameter of 25 mm as a circumscribed circle is attached,
When the outer periphery of a carbon steel for machine structural use (S54C) having a length of 0 mm and a length of 300 mm (S54C) was turned by a lathe, the chip breaking property was evaluated. Cutting speed is 100mm / min, depth of cut is 0.5mm, feed rate
0.2mm / rev, dry cutting. The rotating tool was arranged so that the parallel rake of the round bit was 0 ° and the vertical rake angle was 30 °.

FIG. 8 shows the results of the experiment. The horizontal axis in the graph in FIG. 8 indicates the shape or shape of the chip breaker, and the vertical axis indicates the average length of the chips when each chip breaker is used.

As shown in the figure, the chips were not broken in the hexagonal column-shaped chip breaker, and were continuous chips. On the other hand, the chip breaker 3 provided with the six straight concave portions 31
In the chip breaker 42 provided with two and six curved concave portions 41, chips were broken at a length of 30 mm or less. When the chip breaker 32 and the chip breaker 42 are used, the length of broken chips is substantially equal. In addition, this length was about half of the length of chips when a triangular prism chip breaker was used.

Therefore, by using the chip breaker 32 provided with the six straight concave portions 31 and the chip breaker 42 provided with the six curved concave portions 41, the range in which the chips in which the chip breaker is effective flows is narrowed. It is possible to reduce the size of the broken chips without causing any breakage.

[0030]

The chip breaker of the rotating cutting tool according to the present invention is a chip breaker provided on a rotating cutting tool and abutting against a chip to break the chip, and has a triangular prism or a quadrangular prism. The range of the chip flowing direction in which the chip breaker is effective is widened, and the range of the processing conditions in which the chip breaker is effective is wider than that of the columnar chip breaker. As a result, it is possible to provide a rotary bite chip breaker having high versatility with respect to processing conditions.

The chip breaker of the rotating cutting tool according to the present invention is a chip breaker provided on the rotating cutting tool and abutting against the chip to break the chip, and has a polygonal columnar shape and has a concave portion on each column surface. Since the polygon is characterized by a triangle, a quadrangle, a pentagon, or a hexagon, the chip breaker can reduce the size of the broken chip without reducing the effective range of the chip. Can be. As a result, it is possible to provide a rotary bite chip breaker having high versatility with respect to processing conditions.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a chip breaker of a rotating tool according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a chip breaker of the rotating tool according to the first embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a chip breaker of the rotating tool according to the first embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a chip breaker of a rotating tool according to a second embodiment of the present invention.

FIG. 5 is a graph showing experimental results.

FIG. 6 is a schematic configuration diagram of a chip breaker of a rotating bite according to a third embodiment of the present invention.

FIG. 7 is a schematic configuration diagram of a chip breaker of a rotating bite according to a fourth embodiment of the present invention.

FIG. 8 is a graph showing experimental results.

FIG. 9 is an explanatory diagram of a state of turning by a rotary tool provided with a conventional chip breaker.

FIG. 10 is an explanatory view of a broken state of a conventional chip breaker.

FIG. 11 is an explanatory view of a broken state of a conventional chip breaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Rotating tool 12 Round bit tool 13, 21, 32, 42 Chip breaker 14 Workpiece 15 Chip 31 Straight recess 42 Curved recess

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor: Tetsuya Meiji 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima F-term in Hiroshima Research Laboratory, Mitsubishi Heavy Industries, Ltd. 3C046 AA11 AA13 JJ02

Claims (3)

[Claims] 1. A chip breaker provided on a rotating cutting tool, which breaks chips by contacting the cutting chips, wherein the chip breaker has a triangular prism or a quadrangular prism. 2. A chip breaker provided on a rotating cutting tool and abutting against the chip to break the chip, wherein the cutting tool has a polygonal column shape and is provided with a concave portion on each of the column surfaces. Chip breaker. 3. The chip breaker according to claim 2, wherein the polygon is a triangle, a square, a pentagon, or a hexagon.