JPH08174311A - Throwaway tip - Google Patents

Abstract

PURPOSE: To dispose easily of chips, and the like, by crushing finely with high efficiency cutting chips from cutting edge on periphery in a portion of chip breaker groove. CONSTITUTION: In a throwaway tip in which at least one of upper/lower faces 11a is circular in form, cutting edge 12 is disposed on the periphery, and a chip breaker groove 13 is formed on the side of inner periphery along cutting edge 12, recess/protrusion are formed in radial direction circumferentially on the side of inner periphery, 13a, and/or on the side of outer periphery, 13b, in the breaker groove. Then, depending on the need, a fixation portion 14b in polygonal form for fixing to a cutting tool proper is disposed at the middle of the upper/lower faces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a milling cutter, a bite,
The present invention relates to a throw-away tip used for a cutting tool such as a boring tool, and more particularly, to a throw-away tip having at least one of upper and lower surfaces formed into a circular shape and a cutting edge formed on the peripheral edge thereof.

[0002]

2. Description of the Related Art Conventional throw-away inserts used for cutting tools such as milling cutters, bites, and boring holes have a polygonal throw-away insert with a cutting edge on the periphery or a cutting edge on the periphery. A throw-away tip with a circular surface is used, and in recent years,
Circular throw-away inserts with a large effective cutting edge for cutting tend to be used frequently.

As the throw-away tip having such a circular shape, in addition to the one having a flat circular surface, as shown in FIGS. 1 (a) and 1 (b), a cutting edge is provided. Two
In order to crush the chips cut by
On the circular surface 1, a chip breaker groove 3 is formed on the inner peripheral side along the cutting edge 2 at the peripheral edge thereof.

However, in a throw-away tip having a polygonal surface on which a cutting edge is provided on the peripheral edge, the chips cut by the chip breaker groove as described above are finely crushed, but as described above, the circular shape is used. In the throw-away tip provided with the cutting edge 2 on the curved edge, chips flow as in the case of cutting in the nose part of the polygonal throw-away tip, and the chips are the chip breaker grooves described above. However, there was a problem in that the chips were not crushed well by 3 and the cut chips were connected for a long time to a length of 300 to 500 mm, and the chips were entangled in the device, making the treatment difficult.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems in a throw-away tip in which at least one of the upper and lower surfaces has a circular shape and a cutting edge is formed on the peripheral edge thereof. It is a thing.

That is, according to the present invention, in the throw away tip having the circular cutting edge formed on the peripheral edge as described above, the chip breaker groove is provided on the inner peripheral side along the peripheral cutting edge. It is an object of the present invention to provide a throw-away tip that allows the cut chips to be efficiently and finely crushed in the chip breaker groove portion, and the chips can be easily processed. is there.

[0007]

According to the present invention, in order to solve the above problems, the upper and lower surfaces 11a, 11
At least one side of b is a circular shape, a cutting edge 12 is provided on the peripheral edge thereof, and a chip breaker groove 13 is formed on the inner peripheral side along the peripheral cutting edge 12 in the throw-away tip. The inner peripheral side edge portion 13a and / or the outer peripheral side edge portion 13b of the groove 13 is formed so as to be uneven in the radial direction along the circumferential direction.

Further, according to the present invention, in the throw-away tip as described above, a polygonal-shaped attachment portion for attaching to the cutting tool main body is provided in the central portion of the upper and lower surfaces 11a and 11b, if necessary. 14b is provided.

[0009]

In the throw-away tip according to the present invention, when the chip breaker groove 13 is formed on the inner peripheral side along the circular cutting edge 12 at the inner periphery, the inner peripheral edge portion of the chip breaker groove 13 is formed. Since 13a and / or the outer peripheral side edge 13b are formed in a concavo-convex shape in the radial direction along the circumferential direction, the chips cut by the cutting edge 12 are the inner peripheral side edge 13a and the outer peripheral side of the chip breaker groove 13. The edge portion 13b is reliably crushed by hitting the concave portion or the convex portion of the edge portion 13b, and when the outer peripheral side edge portion 13b of the chip breaker groove 13 is made uneven, the outer periphery of the cutting edge 12 and the chip breaker groove 13 is The width of the land portion between the side edge portion 13b and the side edge portion 13b changes, the load applied when the chips cut by the cutting blade 12 pass through the land part changes, and the chips are crushed. It becomes easier.

When the throw-away tip according to the present invention is attached to the main body of the cutting tool, the attachment portion 1 having a polygonal shape is formed at the center of the upper and lower surfaces 11a and 11b.
When 4b is provided, the cutting edge 12 of the part that was being cut is worn or chipped, and when the position of the cutting edge 12 that is cut is changed, the angle of the polygonal mounting portion 14b is changed. In this way, a new cutting edge 12 can be easily selected only by rotating the throw-away tip to a position matching the cutting tool body and attaching the same.

The polygonal mounting portion 14b is also provided.
If the chip breaker groove 13 is formed in a concavo-convex shape as described above in accordance with the above, the concave portions and the convex portions of the chip breaker groove 13 are arranged at appropriate positions, so that the chips cut by the cutting blade 12 can be more reliably formed. In the state where the chip breaker groove 13 is crushed by hitting a concave portion or a convex portion of the groove 13,
This throw-away tip can be easily attached to the cutting tool body.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a throw-away tip according to the present invention will be specifically described below with reference to the accompanying drawings.

(Embodiment 1) In the throw-away tip of this embodiment, (a) and (b) of FIGS.
As shown in FIG.
The cutting edge 12 is formed on each of the peripheral edges of the b, and the cutting edge 12 is formed on each of the peripheral edges of the both surfaces 11a and 11b.
Along the inner periphery of the chip breaker groove 13 and the edge portion 13a of the inner periphery of the chip breaker groove 13 is formed.
Is made slightly higher than the cutting edge 12 at the peripheral edge so that the thickness of the central portions of the circular upper surface 11a and the lower surface 11b is thicker than that of the peripheral cutting edge 12.

Further, in this embodiment, the inner peripheral side edge portion 13a of the chip breaker groove 13 is formed so as to be uneven in the radial direction along the circumferential direction, and the inner peripheral side edge portion 13a is formed. As shown in FIG. 4A, the width of the chip breaker groove 13 is narrowed at the protruding portion 15a protruding outward in the radial direction, while the inner peripheral edge 13a is radially inward. In the concave portion 15b that is recessed in, the chip breaker groove 13 has a wider groove width, as shown in FIG.

Also, the above-mentioned circular upper and lower surfaces 11
A circular mounting hole 14a is provided as a mounting portion 14a for mounting on a cutting tool body (not shown) such as a milling cutter or a cutting tool in the central portion of a and 11b.
A bolt, a pin, or the like is inserted into 4a so as to be attached to the cutting tool body.

Here, when the throw-away tip of this embodiment is attached to the cutting tool body as described above, as shown in FIG. 2, the cutting tool is moved when the cutting tool is moved to cut an object to be cut. With respect to the moving direction A,
The convex portion 15a on the inner peripheral side edge portion 13a of the chip breaker groove 13 is configured to project at a right angle.

As described above, the projection 15a on the inner peripheral edge 13a of the chip breaker groove 13 is formed in the moving direction A of the cutting tool.
The throw-away tip is attached to the cutting tool body so as to project at a right angle to the cutting tool body, and the cutting tool is moved to move the cutting edge 12 at the peripheral edge of the throw-away tip.
When the object to be cut is cut by the above, the cut chips of the object to be cut become the inner peripheral edge 13a of the chip breaker groove 13.
The bumps 15a of the chip breaker are crushed into small pieces, and the chips that did not hit the bumps 15a are also drawn into the recesses 15b between the bumps 15a, and there is no escape place, so that the inside of the chip breaker groove 13 is removed. It came into contact with the wall surface at the peripheral edge portion 13 and was finely crushed.

If, as a result of continuing the cutting of the work piece in this way, wear or chipping occurs in the cutting edge 12 in the portion where the cutting was being performed, the throw-away tip attached to the cutting tool body is used. By rotating the chip breaker groove 13 in the moving direction A of the cutting tool as described above.
The convex portion 15a of the inner peripheral side edge portion 13a is projected at a right angle so that the portion of the cutting edge 12 for cutting is changed. In addition, after using the portion of the cutting edge 12 on one side of the throw-away tip in this manner, the throw-away tip is turned upside down and the upper and lower surfaces 11
By changing a and 11b, a new cutting blade 12 is used to perform cutting in the same manner as in the above case.

(Embodiment 2) Also in the throw-away tip in this embodiment, as shown in FIG. 5 and FIG.
Cutting edges 12 are formed on the peripheral edges of the circular upper surface 11a and the circular lower surface 11b, respectively.
A chip breaker groove 13 is formed on the inner peripheral side of each of the cutting edges 12 at the peripheral edges of a and 11b, and the inner peripheral edge 13a of the chip breaker groove 13 is slightly higher than the cutting edge 12 at the peripheral edge. The thickness of the central portion of the circular upper surface 11a and the circular lower surface 11b is made thicker than that of the peripheral cutting edge 12.

In the throw-away tip of this embodiment, when forming the chip breaker groove 13, the inner peripheral side edge 13a of the chip breaker groove 13 is formed in the circumferential direction in the same manner as in the first embodiment. Along the radial direction, the outer peripheral edge 13b of the chip breaker groove 13 is formed into a polygonal shape so that the corners are located at the portions corresponding to the convex portions 15a of the inner peripheral edge 13a. The outer peripheral edge 13b is formed.
Also, the width of the land portion 16 between the cutting edge 12 and the outer peripheral side edge portion 13b of the chip breaker groove 13 is changed so as to be uneven along the circumferential direction.

Further, in the throw-away tip of this embodiment, the upper and lower surfaces 11a, 1 having a circular shape are formed.
As shown in FIGS. 5 and 6, a mounting hole 14b having a polygonal shape (an octagonal shape in the example shown in the drawings) is provided as a mounting portion 14b for mounting on a cutting tool body such as a milling cutter or a cutting tool in a central portion of 1b. Each corner of the polygonal mounting hole 14b is provided so that the inner peripheral edge 1 of the chip breaker groove 13 is formed.
The projections 15a in 3a and the corners of the outer peripheral edge 13b are aligned radially.

When the throw-away tip of this embodiment is attached to the cutting tool body, a screw, a bolt or the like is inserted into the polygonal mounting hole 14b to be attached to the cutting tool body. 1
Similarly to the case of the above, with respect to the moving direction A of the cutting tool when the cutting tool is moved to cut the object to be cut, the convex portion 1 at the inner peripheral side edge portion 13a of the chip breaker groove 13 is formed.
5a was made to project at a right angle.

As described above, the convex portion 15a on the inner peripheral edge 13a of the chip breaker groove 13 is formed in the moving direction A of the cutting tool.
The throw-away tip is attached to the cutting tool body so as to project at a right angle to the cutting tool body, and the cutting tool is moved to move the cutting edge 12 at the peripheral edge of the throw-away tip.
When the object to be cut is cut by the above method, as in the case of the first embodiment, the cut chips of the object to be cut hit the projections 15a on the inner peripheral side edge 13a of the chip breaker groove 13 and are finely crushed. And this convex part 1 again
Chips that did not hit the 5a are also drawn into the recesses 15b between the projections 15a and there is no escape place, and the chips are crushed finely by hitting the wall surface at the inner peripheral edge 13a of the chip breaker groove 13. The outer peripheral side edge portion 13b having a polygonal shape of the chip breaker groove 13
The shavings on the walls of the slab also hit the shreds and became shattered finely.

Further, in the throw-away tip of this embodiment, the width of the land portion 16 between the outer peripheral side edge portion 13b of the tip breaker groove 13 and the cutting edge 12 is changed, so that the cutting edge 12 is used for cutting. When the scraps produced were introduced into the chip breaker groove 13, the load applied to the scraps changed, and the scraps were more easily crushed.

Then, as a result of continuing the cutting of the object to be cut as described above, when the cutting edge 12 of the part where the cutting is performed is worn or chipped, the cutting edge 12 is cut.
In changing the portion of (4), the position of the corner of the polygonal mounting hole 14b is changed so that the position of the throw-away tip attached to the cutting tool body is changed.

In this way, it is possible to easily select the new cutting edge 12 portions which are not worn or chipped in order and perform cutting, and also to attach the mounting hole 14
Since each corner of b corresponds radially to the position of the convex portion 15a on the inner peripheral side edge portion 13a of the chip breaker groove 13, when the throw-away tip is attached to the cutting tool body, the inside of the chip breaker groove 13 is The convex portion 15a of the peripheral side edge portion 13a can be easily attached so that the convex portion 15a always projects at a right angle to the moving direction A of the cutting tool.

After using the cutting edge 12 on one side of the throw-away tip in this way, the throw-away tip is turned over and the upper and lower surfaces 11a, 11b are turned over as in the case of the first embodiment. Was changed to perform cutting with a new cutting edge 12 in the same manner as in the above case.

In the throw-away tip according to the above-described first and second embodiments, the upper surface 11a and the lower surface 11 thereof are
Both sides of b are formed into a circular shape, and the cutting edge 12
However, it is also possible to form only the upper surface 11a into a circular shape so that the cutting edge 12 is provided only on the peripheral edge of the upper surface 11a, and in order to attach the throw-away tip to the cutting tool body. As the mounting portions 14a and 14b, the mounting holes 14 penetrating from the upper surface 11a to the lower surface 11b
Although a and 14b are provided, these mounting portions 14
a and 14b also have such through holes 14a and 14b
It is not limited to.

Next, RNMG120 specified in JIS
Using 400 throw-away tips formed as in Examples 1 and 2 above and conventional throw-away tips formed as shown in FIG.
Each of these throw-away tips was held in an appropriate holder, and the outer diameter cutting, end face cutting, inner diameter cutting and outer diameter R curved surface cutting of the object to be cut were performed, and the state of the cut chips was examined.

Here, in performing the outer diameter cutting and the end surface cutting, as the object to be cut, as shown in FIG.
A cylindrical object 20 made of M440 is used, a CNC lathe manufactured by Okuma Co., Ltd. is used as a tester, and the object 20 is rotated at a peripheral speed of 200 m / min in the circumferential direction to obtain an outer diameter. In cutting, each throw-away tip is 0.3 to 1.0 mm / r along the axial direction X of the workpiece 20.
ev is sent and the cut is 0.5-1.5 mm
Then, the outer peripheral surface 20a of the work piece 20 is cut, and in the end face cutting, each throw-away tip is cut along the radial direction Y of the work piece 20 by 0.3 to 1.0 mm / r.
ev is sent and the cut is 0.5-1.5 mm
Then, the end surface 20b of the object 20 to be cut is cut.

As a result, when the throw-away tip formed as in Examples 1 and 2 above is used, the cut chips are crushed well as described above, and the length of the chips is 5. While the length was up to 50 mm, the chip length was 300 to 500 mm when the conventional throw-away tip shown in FIG. 1 was used.

Further, in performing the inner diameter cutting, as shown in FIG. 8, a cylindrical object 21 made of an SCr material is used as an object to be cut, and a NC machine manufactured by Kyohosha Co., Ltd. is used as a testing machine. While using a lathe to rotate the work piece 21 in its circumferential direction at a peripheral speed of 200 m / min, each throw-away tip is moved along the axial direction X along the inner peripheral surface 21a of the work piece 21. While sending at 8 mm / rev,
The cut is made to be 0.5 mm so that the inner peripheral surface 21a of the object to be cut 21 is cut.

Even when the inner diameter cutting is carried out in this way, as in the case of the outer diameter cutting and the end face cutting, when the throw-away tips formed as in the above-mentioned Examples 1 and 2 are used, the cutting is performed. The cut chips were crushed well as described above, and the length of the cut chips was considerably shorter than that in the case of using the conventional throw-away tip shown in FIG.

Further, when performing the outer diameter R curved surface cutting, as shown in FIG. 9, the object to be cut is a disc-shaped member made of an SCr material, the peripheral surface 22a of which is a curved surface curved outward. An NC lathe manufactured by Kyohosha Co., Ltd. is used as a test machine, and this cutting object 22 is rotated at a peripheral speed of 200 m / min in the circumferential direction, and each throw-away tip is cut into the cutting object 22. 0.8mm along the curved surface of
In addition, the curved surface 22a of the object to be cut 22 is cut by setting the cutting depth to 0.5 mm.

Even in the case where the outer diameter R curved surface cutting is performed in this way, as in the case of each of the above-mentioned cutting, the cutting can be performed by using the throw-away tips formed as in the above-mentioned Examples 1 and 2. The chips were crushed well as described above, and the length of the cut chips was considerably shorter than that when the conventional throw-away tip shown in FIG. 1 was used.

[0036]

As described above in detail, in the throw-away tip according to the present invention, the inner edge and / or the edge of the tip breaker groove formed on the inner side of the circular cutting edge. Since the outer peripheral side edge is formed in a concavo-convex shape in the radial direction along the circumferential direction, the chips cut by the cutting blade are crushed well in this chip breaker groove, and the length of the cut chips is shortened. Unlike conventional throw-away inserts that have a circular cutting edge, the cut chips do not become long and entangled in the device, making it easy to process the cut chips. I can do it.

When the throw-away tip according to the present invention is attached to the cutting tool body, a polygonal attachment portion for attaching to the cutting tool body is provided at the center of the upper and lower surfaces of the throw-away tip. When the cutting edge becomes worn or chipped and is changed to a new cutting edge, it is only necessary to change the corner of the polygonal mounting part and attach this throw-away tip to the cutting tool body. , It is now easier to select and use new cutting edge parts one after another.

Further, when the chip breaker groove is formed in an uneven shape in accordance with the mounting portion having the polygonal shape, the concave portion or the convex portion in the chip breaker groove should be arranged at an appropriate position with respect to the moving direction of the cutting tool. Can be performed easily, and the chips cut by the cutting edge can be crushed more reliably in the chip breaker groove, and even when the cutting edge part to be cut is changed to a concave part or The convex portion can be arranged at an appropriate position with respect to the moving direction of the cutting tool, and the cut chips can always be reliably finely crushed in the chip breaker groove.

[Brief description of drawings]

FIG. 1 is a plan view and a cross-sectional view of a conventional circular throw-away tip in which a cutting edge is provided on the periphery of a circular surface.

FIG. 2 is a plan view of the throw-away tip according to the first embodiment of the present invention.

FIG. 3 is a front view of the throw-away tip according to the first embodiment.

FIG. 4 is an explanatory diagram showing a change in groove width of a chip breaker groove in the throw-away tip of Example 1.

FIG. 5 is a plan view of a throw-away tip according to Embodiment 2 of the present invention.

FIG. 6 is a partially enlarged plan view of the throw-away tip according to the second embodiment.

FIG. 7 is a perspective view showing a state of an object to be cut that is outer diameter cut and end face cut by a throw-away tip.

FIG. 8 is a perspective view showing a state of an object to be cut whose inner diameter is cut by a throw-away tip.

FIG. 9 is a front view showing a state of an object to be cut that has an outer diameter R curved surface cut by a throw-away tip.

[Explanation of symbols]

 11a Upper surface 11b Lower surface 12 Cutting edge 13 Chip breaker groove 13a Inner peripheral edge of chip breaker groove 13b External peripheral edge of chip breaker groove 14b Polygonal mounting part (mounting hole)

Claims (2)

[Claims] 1. At least one of the upper and lower surfaces 11a, 11b has a circular shape, and a cutting edge 12 is provided on the peripheral edge thereof, and the chip breaker groove 1 is formed on the inner peripheral side along the peripheral cutting edge 12.
In the throw-away tip in which 3 is formed, the inner edge portion 13a and / or the outer edge portion 13b of the chip breaker groove 13 is formed to be uneven in the radial direction along the circumferential direction. Characteristic throw-away tip. 2. The indexable insert according to claim 1, wherein the upper and lower surfaces 11a, 11b have a polygonal mounting portion 14b attached to the center of the cutting tool body.
A throw-away tip characterized by being formed with.