JP2001252803A - Throwaway tip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the life by restraining abrasion and heat generation due to friction with tips. SOLUTION: Cutting edges 6 are respectively formed on four ridge parts of the top 3. A downward inclined cutting face 9 is provided on the inside of the cutting edge 6, and an upward inclined raised part 10 is provided on the inside thereof. Plural slits 12 are arranged in the direction of intersecting the cutting edge 6 in each raised part 10, and a groove part 13 communicating with each slit 12 is provided in a space up to the central raised part 14 inside the raised part 10. The raised part 10 and the central raised part 14 are at the same level.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throw-away insert (hereinafter sometimes referred to as an insert) suitable for heavy cutting, for example, for cutting a work material such as a rolling roll with a deep cut.

[0002]

2. Description of the Related Art Conventionally, as a throw-away tip used for heavy cutting such as a rolling roll as described above, there is, for example, an approximately square plate-shaped tip. In this tip, a ridge on an upper surface opposed to a lower surface forming a seating surface is known. Is a cutting edge, and a rake surface with a downward slope and a raised portion with an upward slope rising from the bottom of the rake face are provided inside the upper surface following the cutting edge, and are connected to a central plane portion having an insertion hole for clamping. It has. The side surface forming the cutting edge at the intersection ridge line with the upper surface is a negative flank having a clearance angle of 0 °. When such a chip is mounted on the tool body and the work material is cut, the chips generated by cutting with the cutting edge travel down the rake face in the direction intersecting the cutting edge and rise upwards. It is curled and discharged.

[0003]

However, in such a conventional chip, when the chips pass through the raised portion and come into surface contact with and scrape, the raised portion is overheated and the chips are easily welded to the raised portion. Further, there is a disadvantage that the life of the chip is shortened because the raised portion becomes high heat due to friction with the chips and is easily worn. In addition, there is also a drawback that cutting resistance increases due to scraping of chips at the raised portions. SUMMARY OF THE INVENTION In view of such circumstances, an object of the present invention is to provide a throw-away tip that can suppress abrasion and heat generation due to rubbing with chips and improve the tip life.

[0004]

In the indexable insert according to the present invention, a cutting edge is formed on a ridge of one surface, and a rake surface is formed inside the cutting edge, and the rake surface is formed inside the rake surface. A raised portion having a rising slope is provided, and a plurality of slits are arranged in the raised portion in a direction intersecting the cutting blade, and a groove communicating with the slit is provided inside the raised portion. And Chips generated by the cutting edge during cutting run while rubbing the ridges after traveling on the rake face, but the slits are arranged in the ridges, so the contact area between the chips and the ridges is small and chips To prevent chips from adhering to the ridges and promote chip separation, and at the same time, each slit communicates with the groove even if heat is generated by rubbing with chips at the ridges. Since heat can be released through the grooves, chip welding and wear due to heat generation of the raised portions can be suppressed, and the chip life can be improved.

[0005] A second raised portion having the same height as the raised portion may be formed inside the groove. In this case, the repetition of the cutting gradually wears the protruding portion, so that a step is generated between the protruding portion and the second protruding portion, so that a breaker can be formed, and curling and breaking of chips can be promoted. Further, a second raised portion that is higher than the raised portion may be formed inside the groove. In this case, a breaker can be constituted by the raised portion and the second raised portion from the start of cutting, so that curling of chips, cutting processing, and the like can be performed. The throw-away tip is formed in a substantially rectangular plate shape, and one surface is an upper surface facing the seating surface, and each of the four ridges is a cutting edge, and a rake face and a raised portion in which slits are arranged inside the cutting edge. , A groove and a second raised portion may be sequentially provided. In this case, two corners or four corners can be used by changing corners.

[0006]

Embodiments of the present invention will now be described with reference to the accompanying drawings. 1 to 7 show an embodiment of the present invention. FIG. 1 is a perspective view of a throw-away tip according to the embodiment, FIG. 2 is a plan view thereof, and FIG. 3 is a center of the throw-away tip shown in FIG. FIG. 4 is a longitudinal sectional view, and FIG.
5 is a partial longitudinal sectional view along the line XX of the throw away tip shown in FIG. 5, FIG. 5 is a partial vertical sectional view along the line YY of the throw away tip shown in FIG. 2, and FIG. It is a longitudinal cross-sectional view which follows the ZZ line. The indexable insert 1 according to the present embodiment is made of, for example, a cemented carbide and has a substantially polygonal plate shape, particularly a substantially square plate shape, for example, a substantially square plate shape, and has an upper surface 3 facing the lower surface 2 forming a seating surface. A rake face is provided and each side face 4 is a flank face.

The ridges where the upper surface 3 and the side surfaces 4 intersect each other are formed as cutting edges 6 and are formed on the entire circumference, and lands 7 are formed on the entire circumference. In the center of the upper surface 3, an insertion hole 8 for clamping is formed, which penetrates the upper and lower surfaces. Alternatively, a flat clamping surface may be used. The side surface 4 constituting the flank of the cutting edge 6 is substantially perpendicular to the lower surface 2 and is a negative with a clearance angle of 0 °. The relief angle may be positive (conformal angle), but a negative is more preferable in order to prevent the cutting edge 6 from being damaged during heavy cutting. 2 to 5
On the upper surface 3 shown in FIG.
A downwardly inclined rake face 9 which gradually approaches the lower surface 2 toward the insertion hole 8 is formed on the inside of the inside, and a rising inclined ridge 10 which rises at an appropriate angle by drawing a concave curve at the bottom of the rake face 9 is formed. Is provided. Therefore, the raised portion 10 is formed in a substantially square frame shape that is substantially parallel to the cutting edge 6 along each of the four cutting edges 6 in plan view shown in FIG. In this case, the top of the raised portion 10 is located at a position lower than the cutting edge 6 from the lower surface 2 as shown in FIG. 4, but may be at the same height or at a position higher than the cutting edge 6.

In the raised portion 10, a plurality of groove-shaped slits 1 extend in a direction intersecting the cutting blade 6, in a direction substantially orthogonal to the drawing.
2 are formed along the protruding shape of the protruding portion 10, and each slit 12 has a substantially arc-shaped bottom portion 12a in a vertical cross-sectional view at an appropriate position as shown in FIG.
0.45 mm), the two peripheral portions 12b, 12b form an inclined concave curved surface that spreads smoothly upward, and are arranged at predetermined intervals in the extending direction of the cutting blades 6. Ridges 1 on adjacent sides in rows of slits 12 along each cutting edge 6
At the corner where 0 and 10 intersect, one slit 12 and one slit 12 of the slit row along the cutting edge 6 on the adjacent side
Communicate with each other substantially orthogonally, but may be separated from each other. Further, a groove 13 having a concave curved surface in a sectional view is formed substantially in parallel with the cutting blade 6, for example, further inside the raised portion 10, and the groove 13 is formed of four sides of the cutting blade 6 in plan view shown in FIG. 2. Like the square, it is formed in a substantially square shape along each cutting edge 6 so as to communicate with the entire circumference. Moreover, the groove 13 is configured to communicate with each of the plurality of slits 12 arranged along each cutting edge 6. The groove 13 is a slit 12
It may be slightly deeper but may be the same depth. Further, a substantially planar central raised portion 14 having the same height as the raised portion 10 is provided inside the groove portion 13.
(Second raised portion) is provided, and the central raised portion 14 is provided.
Is located at the center of the upper surface 3 and has, for example, a substantially square shape in plan view, and an insertion hole 8 is formed in the center thereof.

Since the indexable insert 1 according to the present embodiment is configured as described above, the insert 1 is mounted on a turning tool (not shown) with the lower surface 2 as a seating surface, and is cut by the corner blade of the upper surface 3. When the work material is cut with the blade 6, the sharpness is ensured even if the clearance angle is negative because the rake face 9 of the cutting blade 6 is positive. After the chips generated by the cutting edge 6 travel on the rake face 9, they move upward along the ridge 10. At this time, since the ridge 10 is provided with a row of slits 12 at predetermined intervals, The contact area between the chip and the raised portion 10 is small, so that abrasion can be suppressed and frictional heat can be suppressed. Moreover, even if the raised portions 10 generate heat due to scraping between the adjacent slits 12 and the slits 12, the heat of the raised portions 12 is released through the groove portions 13 because the slits 12 communicate with the groove portions 13. Can be.
In addition to this, since the slits 12 are arranged along the direction in which the chips travel, the contact area is also small, the welding of the chips to the raised portions 10 is reliably suppressed, the chip separation is promoted, and the cutting resistance is further reduced. Can be reduced. Then, the chips are curled on the inclined surface of the raised portion 10, bent, processed and discharged.

When the raised portion 10 is worn by repeated scraping of the work material with the chips, the raised portion 12
Has a height that is lower than the inner central ridge 14.
Then, the raised portion 10 and the central raised portion 14 sandwich the groove 13.
This area functions as a breaker, so that even if there is any chip that can get over without being curled by the raised portion 10, it is curled and bent by the step with the central raised portion 14 and cut. And the like, and the chip processing is further promoted.

As described above, according to the present embodiment, the protrusions 10 are prevented from being rubbed by the chips, and the heat generated by the protrusions 10 is released through the slits 12 and the grooves 13 so that the chips can be separated from the protrusions 10. , The cutting resistance can be reduced, the chip welding can be prevented, the chip processing can be performed smoothly, and the chip life can be improved. Furthermore, if the protruding portion 10 is worn by repeating cutting, the step with the central protruding portion 14 functions as a breaker, and it is possible to further promote chip breaking and dischargeability.

In the above-described embodiment, the slit 12 is provided not on the rake face 9 but on the raised portion 10. However, the present invention is not limited to this. The length is arbitrary. Further, the slit 12 is configured to extend in a direction substantially perpendicular to the cutting blade 6, but may extend in a direction inclined at an obtuse angle or an acute angle with respect to the cutting blade, and preferably extends along the chip traveling direction. I just need. Further, the slits 12 in the same row do not have to be parallel to each other, and their angles may differ from each other by a small angle. Further, a second groove portion which intersects at an intermediate portion of each slit 12 in the same row facing one cutting edge 6 is formed into a groove portion 13.
May be formed in parallel or with a slight angle. In this case, the heat radiating property can be enhanced by further reducing the area rubbed with the chips.

In the above-described embodiment, the throw-away tip 1 having a substantially square plate shape has been described. However, the shape of the throw-away tip is not limited to this, and a substantially polygonal shape such as a substantially triangular shape or a hexagonal shape may be used. The present invention can be applied to a throw-away tip having other appropriate shapes. In the above-described embodiment, the raised portion 10 and the central raised portion 14 are set at the same height.
It may be set higher than 0. Further, the tool to which the throw-away insert according to the present invention can be mounted is not limited to a turning tool, but may be a rolling tool, and can be mounted to various cutting tools.
The upper surface 3 constitutes one surface, and the central raised portion 14 constitutes a second raised portion.

[0014]

As described above, in the indexable insert according to the present invention, a cutting edge is formed on the ridge of one surface, and a rake surface is formed inside the cutting edge. A raised portion having a rising slope is provided inside, and a plurality of slits are arranged in the raised portion in a direction intersecting the cutting blade, and a groove communicating with the slit is provided inside the raised portion, so that the slit is provided. Because of this, the contact area between the chip and the raised portion is small, and the wear of the raised portion due to the scraping with the chip is suppressed, and at the same time each slit can radiate heat through the groove even if heat is generated by the scraping with the chip at the raised portion, It is possible to suppress the chip from being welded to the protruding portion, promote chip separation, suppress the abrasion of the protruding portion, and improve the chip life.

Further, since the second raised portion having the same height as the raised portion is formed inside the groove, if the raised portion is gradually worn by repeated cutting, a step is generated between the raised portion and the second raised portion. A breaker can be formed, and curling and cutting of chips can be promoted. Further, since the second raised portion having a height higher than the raised portion is formed inside the groove portion, a breaker can be formed by the raised portion and the second raised portion, and curling of the chips and cutting processing can be performed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a throw-away tip according to an embodiment of the present invention.

FIG. 2 is a plan view of the throw-away tip shown in FIG.

FIG. 3 is a central longitudinal sectional view of the throw-away tip shown in FIG. 2;

FIG. 4 shows X for the throw-away tip shown in FIG.
FIG. 4 is a partial vertical cross-sectional view along the X-ray.

FIG. 5 shows Y for the throw-away tip shown in FIG.
FIG. 4 is a partial vertical cross-sectional view taken along line -Y.

FIG. 6 shows the Z about the throw away tip shown in FIG.
It is a longitudinal cross-sectional view which follows the -Z line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Throw-away tip 3 Top surface 6 Cutting edge 10 Raised portion 12 Slit 13 Groove portion 14 Central raised portion (second raised portion)

Claims (3)

[Claims] 1. A cutting edge is formed on a ridge portion of one surface, a rake face is formed inside the cutting edge, and a raised and inclined ridge is provided inside the rake face, and the ridge is provided. A plurality of slits are arranged in a direction intersecting the cutting edge, and a groove portion communicating with the slit is provided inside the raised portion. 2. The indexable insert according to claim 1, wherein a second raised portion having the same height as the raised portion is formed inside the groove. 3. The indexable insert according to claim 1, wherein a second raised portion having a height higher than the raised portion is formed inside the groove portion.