JP2545472Y2 - Indexable tip - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polygonal indexable insert used as a cutting edge of a cutting tool, particularly extending from a central land to a nose.
The present invention relates to a throwaway chip having a raised portion raised from a plurality of chip breaker grooves.

[0002]

2. Description of the Related Art As a conventional technique, there is, for example, a triangular throw-away tip 100 as shown in FIGS. This indexable tip 100
Three cutting edges 102 each intersecting at the three nose portions 101, three chip breaker grooves 104 provided on the rake face 103 side of the three cutting edges 102, and formed along these cutting edges 102; And a central land portion 105 surrounded by a chip breaker groove 104 of this type.
And a protruding portion 106 extending from the chip breaker groove 104 toward each nose portion 101.

The height of the raised portion 106 gradually decreases from the semi-circular base portion 107 provided on the central land portion 105 side to the semi-circular projected portion 108 provided on the nose portion 101 side. The shape, the base 107 and the projection 10
8 are formed on the same plane. A land 109 provided between the nose portion 101 and the projection 108 is formed in a shape that is flush with the nose portion 101.

[0004]

However, when micro cutting is performed using the conventional indexable insert 100, that is, as shown in FIGS. 14 and 15,
If the depth of cut into the workpiece 110 is near or shallower than the protrusion 108, the height of the protrusion 108 of the raised portion 106 is low, so that there is no obstacle to the chips 111 of the work 110. Did not. Therefore, the chip 111 of the workpiece 110 does not curl in a spiral shape.
3 and the chips 111 of the workpiece 110 were not discharged smoothly.

If the chips 111 are not curled in a spiral, the rigidity of the chips 111 itself is low, so that the direction of discharge of the chips 111 is not directional. Therefore, when the inside diameter of the cylindrical workpiece is machined, there is a problem that the chips 111 are stuck in the workpiece or are entangled with the cutting tool. Further, when the workpiece is subjected to the outer diameter machining, there is a problem that the chip 111 is entangled with the workpiece. Accordingly, in the conventional indexable insert 100, since the chips 111 themselves do not have the desired rigidity and are not smoothly discharged, there is a problem that the removal of the chips 111 is troublesome, and the work and the cutting tool are damaged. was there.

[0006]

The object of the present invention is to provide a throw-away insert that does not require much trouble in removing chips and does not damage a workpiece or a cutting tool.

[0007]

SUMMARY OF THE INVENTION According to the present invention, an approximately triangular rake face serving as a main body for cutting a workpiece and a predetermined clearance angle are used to avoid unnecessary contact with a finished surface of the workpiece. A flank that has escaped, a plurality of cutting edges provided at the intersection of the rake face and the flank, and a bisector formed by two adjacent cutting edges and located adjacent to each other An arc-shaped nose portion connecting the two cutting edges; a rake inclined surface portion provided around the rake surface, formed along the cutting edge, and provided at a predetermined angle from the cutting edge; A plurality of chip breaker grooves formed along the surface portion and having curved side surfaces and a flat bottom surface, provided at the center of the rake face surrounded by these chip breaker grooves, provided at a position higher than the cutting edge. And
A flat central land portion having a hole at the center for attachment to a cutting tool, and a plate extending from the central land portion toward the nose portion, rather than the rake inclined surface portion and two adjacent chip breaker grooves. In a substantially triangle-shaped throw-away chip having a ridge protruding on one side in the thickness direction, the height of a ridge passing on a bisector of a nose angle is higher than that of the nose portion from the central land portion. , Gradually decreasing toward the bottom, having a substantially mortar-shaped concave wall surface on both sides, and a substantially conical root portion where the intersection of the two concave wall surfaces is located on the bisector of the nose angle, from the root portion A technology provided on the nose portion side, having a substantially hemispherical-shaped barrier portion wider than the root portion, and the rake inclined surface portion having a mortar-shaped hollow portion between the nose portion and the barrier portion. Means were adopted.

[0008]

According to the present invention, in the case of micro-cutting a workpiece, that is, in the vicinity of a wide, substantially hemispherical barrier provided at the tip of the raised portion, the cutting depth of the workpiece is small. The chips that flowed out from the blade rubbed on the rake slope from the plurality of cutting edges toward the bottoms of the chip breaker grooves, and then the raised barrier extending from the central land to the nose. Collides with and curls in a spiral.

[0009] When the depth of cut into the workpiece is smaller than the barrier portion, chips flowing out of the cutting edge are raked from the plurality of cutting edges toward the bottom surfaces of the plurality of chip breaker grooves on the rake slope. After being rubbed, the curl is spirally formed by the rake portion on the side opposite to the nose portion and the cutting edge, and further by the concave portion surrounded by the barrier portion provided at the tip.
For this reason, the chips of the workpiece have higher rigidity, and thus can have directionality in the chip discharging direction. Therefore, the chips of the workpiece are discharged smoothly and do not become entangled with the workpiece or the cutting tool.

Further, when the depth of cut into the workpiece is deep, the chips flowing out of the cutting edge rub on the rake inclined surface and enter the chip breaker groove, and smoothly spiral with low resistance. Curled. Therefore, the extensibility is hindered by increasing the rigidity of the chips of the workpiece,
It is easy to break. After that, it hits the mortar-shaped concave wall surface at the base of the raised portion, and is curled in a spiral shape having the same curvature as the shape of the concave wall surface. Then, the chips curled in a spiral shape are broken at the same time as they leave the concave wall surface at the root.

[0011]

[Effects of the invention] The present invention is applicable to
Since the chips are directional in the discharge direction, the spilled chips do not jam in the workpiece or become entangled with the cutting tool. Also, when the workpiece is machined for outside diameter, similarly, no chips are entangled with the workpiece. That is, since the chips of the workpiece have a direction in the discharge direction, it is not necessary to remove the chips from the workpiece and the cutting tool, and the workability of the cutting process can be improved. Moreover, it is possible to prevent the work and the cutting tool from being damaged, so that the quality of the work can be improved and the durability of the cutting tool can be improved.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Structure of Embodiment] The throw-away tip of the present invention will be described based on one embodiment shown in FIGS. FIG. 1 is a plan view showing a throw-away tip, and FIGS. 2 to 5 are partial cross-sectional views of the throw-away tip.

The throw-away tip 1 is of a positive type, and is made of a heat-resistant or heat-resistant material such as a cermet (a sintered material mainly composed of titanium carbide) or a cemented carbide (a sintered material mainly composed of tungsten carbide). It is formed in a triangular shape from a material having excellent wear properties, and is used as a blade of a cutting tool for cutting a workpiece.

The throw-away insert 1 has a rake face 2 serving as a main body for cutting a workpiece, a flank 3 which has escaped by a predetermined clearance angle in order to avoid unnecessary contact with a finished face of the workpiece, and a cutting face. In operation, it has a plurality of cutting edges 4 which play a major role in chip generation of the workpiece. One cutting edge 4 is connected to another adjacent cutting edge 4 by a nose portion 5.

On the rake face 2, a rake inclined surface portion 6, a plurality of chip breaker grooves 7, a central land portion 8, and a plurality of raised portions 9 are formed.

The rake inclined surface portion 6 has a flat band shape, is provided around the rake surface 2, and is formed along the plurality of cutting edges 4 on the central land portion 8 side from the plurality of cutting edges 4. The rake inclined surface portion 6 is provided to be inclined by a predetermined angle from the cutting edge 4 toward the bottom surface of the chip breaker groove 7.

The plurality of chip breaker grooves 7 are formed along the rake inclined surface portion 6 and have curved side surfaces and a flat bottom surface. These chip breaker grooves 7 cause the chips flowing out of the workpiece to curl in a spiral shape and break into small pieces of an appropriate length when the depth of cut into the workpiece is 2.0 mm or more. .

The center land portion 8 has a flat shape and is provided at the center of the rake face 2 surrounded by a plurality of chip breaker grooves 7. The central land portion 8 has a clamp hole 1 for attaching the throw-away tip 1 to the cutting tool at the center.
0 is formed. This clamp hole 10 is a round hole.

The protruding portion 9 protrudes from the rake inclined surface portion 6 at the end and the chip breaker grooves 7 on both sides. The raised portion 9 includes a substantially conical root portion 11 provided on the central land portion 8 side and a substantially hemispherical barrier portion 12 provided on the nose portion 5 side.

The root portion 11 is provided so as to project from the corner of the central land portion 8 toward the nose portion 5 on the bisector of the nose angle of the throw-away tip 1. The root portion 11 is formed such that the height of the ridge line is gradually lower than that of the central land portion 8. The root 11 has a mortar-shaped concave wall having a cross-sectional shape in which the upper end is sharp on both sides and the lower end is widened, and the intersection of two adjacent concave wall surfaces is on a bisector of a nose angle. It is formed so that it may be located. When the depth of cut into the workpiece is deep,
For example, in the case of a cutting process of 1.0 mm to 2.0 mm, chips flowing out of a workpiece are curled in a spiral shape and broken into small pieces of an appropriate length.

The barrier portion 12 has arc-shaped convex wall surfaces on both sides and the nose portion 5 side so as to have a semi-circular cross-sectional shape, is wider than the root portion 11, and the top surface is a ridge line of the root portion 11. It is formed so as to be lower more gradually. The barrier portion 12 has a depth of cut into the workpiece of 0.1 mm to 1.0 mm.
In the case of a cutting process of mm, the chips flowing out of the workpiece are curled in a spiral and broken into small pieces of an appropriate length.
In addition, the rake portion 5 and the rake inclined surface portion 6 on the opposite side of the cutting edge 4, and the barrier portion 12 provided at the tip of the raised portion 9.
In the case of micro-cutting with a cutting depth of 0.1 mm or less, the recessed portion 15 surrounded by is formed into a small piece of an appropriate length by curling chips flowing out of the workpiece into a spiral shape. Break.

[Operation of Embodiment] The operation of the indexable insert 1 will be described with reference to FIGS. a) At the time of cutting with a cutting depth of 1.0 mm to 2.0 mm Chips of the workpiece generated by the cutting edge 4 rub on the rake inclined surface portion 6 and enter the chip breaker groove 7,
Smoothly curled with low resistance. For this reason, the swarf of the workpiece is prevented from being stretched and easily broken by increasing the rigidity. After that, it hits the mortar-shaped concave wall surface of the root portion 11 of the raised portion 9 and is curled in a spiral shape having the same curvature as the shape of the concave wall surface. Then, the chips curled in a spiral shape are broken at the same time as they leave the concave wall surface of the root portion 11, that is, the tip portion of the root portion 11.

B) In the case of micro-cutting with a depth of cut of 0.1 mm to 1.0 mm As shown in FIGS. 6 and 7, the chips 14 of the workpiece 13 generated by the cutting edge 4 have a rake inclination. The surface portion 6 is rubbed to reach the rising portion of the barrier portion 12 of the raised portion 9.
Then, the chip 14 of the workpiece 13 hits the semicircular convex wall surface of the barrier portion 12 of the raised portion 9 and is curled in a spiral. Then, the chips 14 curled in a spiral shape,
By increasing the rigidity, it becomes directional in the discharge direction. Therefore, the chips 14 are broken at the same time as they leave the semicircular convex wall surface of the barrier portion 12 and are discharged in a certain direction.

C) In the case of micro-cutting with a cutting depth of 0.1 mm or less As shown in FIGS. 8 and 9, the chips 14 of the workpiece 13 generated by the cutting edge 4 are on the rake slope 6. By scraping the nose portion 5 and the rake inclined surface portion 6 on the opposite side of the cutting edge 4, and the barrier portion 12 provided at the tip of the raised portion 9.
Is curled in a spiral shape by the recessed portion 15 surrounded by. Then, the chips 16 curled in a spiral shape have a directionality in the discharge direction by increasing the rigidity. For this reason, the chips 16 are broken at the same time as they leave the hollow portion 15 and are discharged in a certain direction.

[Effects of Embodiment] As described above, this triangular throw-away tip 1
When the inside diameter of a cylindrical workpiece is machined by using, the swarf is directed in the discharge direction, so that the spilled chip does not clog the work or entangle with the cutting tool. Also, when the workpiece is machined for outside diameter, similarly, no chips are entangled with the workpiece.

That is, since the chips of the workpiece are directional in the discharge direction, there is no trouble in removing the chips from the workpiece and the cutting tool, and the workability of the cutting process can be improved. Moreover, it is possible to prevent the work and the cutting tool from being damaged, so that the quality of the work can be improved and the durability of the cutting tool can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a throw-away tip of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view taken along the line CC of FIG. 1;

FIG. 5 is a sectional view taken along line DD of FIG. 1;

FIG. 6 is a diagram illustrating the operation of the indexable insert of the present invention.

FIG. 7 is an operation explanatory view of the indexable insert of the present invention.

FIG. 8 is a diagram illustrating the operation of the indexable insert of the present invention.

FIG. 9 is a diagram illustrating the operation of the indexable insert of the present invention.

FIG. 10 is a plan view showing a conventional throw-away tip.

FIG. 11 is a sectional view taken along line aa of FIG. 10;

FIG. 12 is a sectional view taken along line bb of FIG. 10;

FIG. 13 is a sectional view taken along the line c-c in FIG. 10;

FIG. 14 is an operation explanatory view of a conventional throw-away tip.

FIG. 15 is a diagram illustrating the operation of a conventional throw-away tip.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 throw-away tip 2 rake face 3 flank face 4 cutting edge 5 nose section 6 rake slope face section 7 chip breaker groove 8 center land section 9 ridge section 10 clamp hole 11 base section 12 barrier section 15 recess section

Claims (1)

(57) [Scope of request for utility model registration] 1. A substantially triangular shape which serves as a main body for cutting a workpiece.
To prevent unnecessary contact between the rake face and the finished surface of the workpiece.
And a flank that relief only clearance angle, and a plurality of cutting edges provided on the line of intersection between said rake face and said flank face, position on the bisector which is formed by two cutting edges that next set
Arc-shaped nose portion that connects two adjacent cutting edges, and is provided around the rake face, is formed along the cutting edge, and is provided at a predetermined angle from the cutting edge.
A rake inclined surface portion that is formed along the rake inclined surface, our curved side
Chip breaker grooves with a flat bottom and a flat surface, and the center of the rake face surrounded by these chip breaker grooves
Provided at a position higher than the cutting edge ,
Into a flat central land portion having a hole for attachment to a byte, extended from the center land portion toward the nose portion, before
A rake inclined surface portion and a raised portion which is raised on one side in the thickness direction than two adjacent chip breaker grooves.
In the substantially triangular throw-away tip, the height of a ridge passing through a bisector of a nose angle is gradually reduced from the central land portion toward the nose portion, Has a substantially mortar-shaped concave wall on both sides and has two concave walls
A substantially cone whose intersection line is located on the bisector of the nose angle
A base portion having a substantially hemispherical shape , which is provided closer to the nose portion than the base portion and is wider than the base portion.
And, the rake slope portion is formed between the nose portion and the barrier portion.
Indexable insert, characterized in that to have a recess portion of the mortar shape during.