JP2001047306A - Throw-away tip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a throw-away tip having a polygonal shape in a plane and furnished with a cutting blade at the outer edge of top face capable of preventing clogging of chip or melting fusion and assuring stable machining for a long period of time not only in the normal middle machining operation but also in the high-feed middle machining with a low depth of cut. SOLUTION: This throw-away tip is structured so that a first cutting face 12 having a plane polygonal shape and inclining down from a cutting blade 11 at the outer edge of the top face of the polygon shape and a second cutting face 13 inclining more than the first cutting face are formed continuously, is furnished with a breaker 15 bulging on its oversurface near a nose part 14, and provided with an angle-shaped auxiliary projection 16 directed to the breaker from the first cutting face near the nose part, wherein the condition θ1<θ<θ2 should be met, where θ is the inclining angle of the ridge 16a of the auxiliary projection 16, θ1 is the inclining angle of the first cutting face, and θ2 is the inclining angle of the second cutting face 13.

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 used for cutting by attaching to various cutting tools, and more particularly, to a cutting edge which is formed in a planar polygonal shape at an outer edge of an upper surface thereof. A first rake surface inclined downward from the first rake surface and a second rake surface inclined more greatly than the first rake surface are formed continuously, and a throwaway provided with a raised breaker on an upper surface near a nose portion. It is about chips.

[0002]

2. Description of the Related Art Conventionally, various types of throw-away tips have been used for attaching to a cutting tool. As one of such throw-away tips,
A throw-away tip having a plane polygonal shape and a cutting edge formed on the outer edge of the upper surface has been used.

Further, when cutting is performed by attaching a throw-away chip to a cutting tool, the cut chips are appropriately cut to prevent the cut chips from being clogged and damaging the throw-away chips and the like. Had to be discharged.

[0004] Here, in the case of using a throwaway tip having the above-mentioned polygonal plane shape and a cutting edge formed on the outer edge of the upper surface thereof, and cutting with the nose portion of the throwaway tip and the cutting edge in the vicinity thereof, cutting is performed. In order for the cut chips to be properly cut and discharged, FIG.
As shown in FIGS. 1A and 1B, a first rake face 12 inclined downward from a cutting edge 11 formed on an outer edge of an upper surface of a throw-away tip 10a having a planar polygonal shape,
A second rake face 13 that is larger than the rake face 12 is formed continuously, and the indexable insert 1
0a breaker 15 raised on the upper surface near nose portion 14
The nose portion 14 and the chips cut by the cutting edge 11 in the vicinity of the nose portion 14 are subjected to the first and second rake faces 12,
From 13, it was led to a breaker 15, and the chip was curled and cut by the breaker 15.

Here, when providing the raised breaker 15 on the upper surface near the nose portion 14 of the throw-away tip 10a as described above, light cutting processing is generally performed depending on cutting conditions such as a cutting speed, a feed speed, and a cutting depth.
Breakers 15 are provided at appropriate positions for each of medium cutting and heavy cutting.

On the other hand, in recent years, when cutting is performed using a throw-away insert, in addition to the above-described ordinary cutting, cutting is performed in which the amount of cut is reduced to increase the feed speed. In particular, in the case of performing medium cutting, medium cutting with low cutting depth and high feed has been widely performed in addition to normal medium cutting.

Here, as described above, a conventional middle cutting insert 10a provided with a raised breaker 15 on the upper surface in the vicinity of the nose 14 is used, and the corner of the nose 14 in the insert 10a is used. In the case of performing a cutting process with a low depth of cut of about 0.5 mm to 1 mm smaller than the radius, chips cut by the nose portion 14 and the cutting edge 11 in the vicinity thereof are not guided to the breaker 15, and the cut is performed. Cutting edge 11 on the side adjacent to blade 11
And the breaker 15 flow, and the chips are not cut and extend without being cut, so that the chips are not properly discharged. In the conventional indexable insert 10a, the cut chips are The first and second rake faces 12, 1 of the cutting edge 11 on the side adjacent to the cutting edge 11 that has performed the cutting.
There was also a problem that collision with No. 3 caused chipping or plastic deformation at that portion.

For this reason, in recent years, FIG.
As in the throw away tip 10b shown in (B), the breaker 15 and the second
A small projection 17a having a truncated cone shape is provided between the rake face 13 and the throw-away tip 1 shown in FIGS. 3 (A) and 3 (B).
0c, a columnar projection 17 extends from the second rake face 13 toward the breaker 15 on the upper surface near the nose portion 14.
b, the small projection 17a and the columnar projection 1 thus provided.
7b proposes curling or cutting chips that have been cut at a low depth of cut.

However, the small projection 17a is located at the position as described above.
When the small protrusions 17a and the columnar projections 17b are provided, the chips cut by the nose portion 14 and the cutting edge 11 near the nose portion 14 are removed from the first and second rake faces 12, 13 by the small projections 17a and the columnar projections 1
When the chips are guided to the small projections 17a and the columnar projections 17b, the chips are stuck to the corners of the small projections 17a and the columnar projections 17b, and some of the chips are fused to the small projections 17a and the columnar projections 17b.
There is a problem that a large load is applied at the time of cutting, whereby the cutting blade 11 is damaged, and the small projections 17a and the columnar projections 17b are quickly worn out or broken by the chips, so that stable cutting cannot be performed for a long time. There was a problem.

[0010]

SUMMARY OF THE INVENTION According to the present invention, a cutting edge is formed at the outer edge of the upper surface in the shape of a plane polygon, and a first rake surface inclined downward from the cutting edge and a second rake surface inclined more than the first rake surface. A rake face is formed continuously, and it is an object of the present invention to solve the above-described various problems in the case of performing cutting using a throwaway tip provided with a breaker protruding on an upper surface near a nose portion thereof. It is assumed that.

That is, according to the present invention, when performing cutting using the above-mentioned indexable insert, in addition to ordinary cutting, when performing cutting with a reduced cutting depth and an increased feed rate, In addition to normal medium cutting, even when performing high-feed medium cutting at a low depth of cut, chips are not clogged or fused, and the cut chips are properly It is an object of the present invention to be able to perform stable cutting for a long period after being cut and discharged.

[0012]

In the indexable insert according to the present invention, in order to solve the above-mentioned problem, a cutting edge 11 is formed at the outer edge of the upper surface in a planar polygonal shape, and the cutting edge 11 is formed from the cutting edge 11 downward. 1st rake face 1 that inclines
2 and a second rake surface 13 that is inclined larger than the first rake surface 12 are formed continuously, and a throw-away chip in which a raised breaker 15 is provided on the upper surface near the nose portion 14 is provided. Nose part 1 above
An auxiliary projection 16 having a mountain shape is formed from the first rake face 12 in the vicinity of the first rake face 12 toward the breaker 15.
The inclination angle θ of the ridge line 16a, the inclination angle θ1 of the first rake face 12, and the inclination angle θ2 of the second rake face 13 satisfy the condition of θ1 <θ <θ2. .

The first rake face 12 near the nose portion 14 like the throw-away tip of the present invention.
Auxiliary projection 16 which is shaped like a mountain toward the breaker 15
Is formed, when the chips cut by the nose portion 14 and the cutting edge 11 in the vicinity thereof are guided from the first rake face 12 to the auxiliary projections 16, the chips do not clog the auxiliary projections 16, Chips are smoothly guided to the auxiliary projections 16.

Further, when cutting is performed with the nose portion 14 of the throw-away tip and the cutting blade 11 in the vicinity thereof in the present invention, the cutting amount is reduced and the feed speed is increased. Chips cut by the blade 11 are smoothly guided from the first rake face 12 to the auxiliary projection 16 as described above, and the chip is appropriately curled by the slope of the auxiliary projection 16 on the side of the nose portion 14 and cut. Therefore, even when medium cutting is performed at a high cutting rate at a low cutting depth, chips are not elongated or clogged.

Also, when ordinary cutting is performed by the indexable insert according to the present invention, chips cut by the nose portion 14 and the cutting edge 11 near the nose portion 14 smoothly flow from the first rake face 12 to the auxiliary projection. 16 and the chips are further removed from the auxiliary projection 16 by the breaker 1.
5, the chip is appropriately curled by the breaker 15 and cut. Furthermore, the slope of the auxiliary projection 16 on the side opposite to the nose portion 14 side allows
The end of the chip guided to the auxiliary projection 16 on the nose portion 14 side is lifted up, and the first and second rake faces 12 of the cutting blade 11 on the side adjacent to the cutting blade 11 on which the chip is cut,
13, the rake faces 12, 13 are prevented from being plastically deformed or chipped.

Further, in the indexable insert of the present invention, the inclination angle θ of the ridge line 16a of the auxiliary projection 16, the inclination angle θ1 of the first rake face 12, and the inclination angle θ2 of the second rake face 13 are different. , Θ1 <θ <θ2, so that the first rake face 12
The chips that are guided to the auxiliary projection 16 from the
When flowing over the chip, a large resistance is not applied to the chip, the wear of the auxiliary projection 16 is suppressed, and the cut chip is smoothly guided over the auxiliary projection 16. , The load applied during cutting is reduced,
The breakage of the cutting blade 11 and the like is prevented.

Here, the ridge 16a of the auxiliary projection 16 is described.
When the inclination angle θ of the first rake face 12 becomes smaller and approaches the inclination angle θ1 of the first rake face 12, the resistance applied to the chips flowing on the auxiliary projection 16 increases, while the ridgeline 16a
Of the second rake face 13 is increased.
2, the nose portion 14 of the auxiliary projection 16
Since it is difficult to curl and cut the chips at the time of low cutting due to the side slope, the inclination angle θ of the ridge line 16a of the auxiliary projection 16 is set to θ1.
It is more preferable to be in the range of + 3 ° ≦ θ ≦ θ2-5 °.

If the width d of the chevron-shaped auxiliary projection 16 is small, the strength of the auxiliary projection 16 is reduced.
While the auxiliary projection 16 is easily damaged during cutting, if the width d of the auxiliary projection 16 is too large, the resistance applied to the chips flowing on the auxiliary projection 16 increases,
Since the load applied at the time of cutting becomes large and the cutting blade 11 or the like is liable to be damaged, it is preferable to set the width d of the auxiliary projection 16 in the range of 0.3 mm to 1.0 mm. .

[0019]

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

In the throw away chip 10 of this embodiment, as shown in FIGS.
A cutting edge 11 is formed on the outer edge of the upper surface formed by the upper surface and the flank 18 which are formed into a planar polygonal shape. here,
The planar shape of the throw-away tip 10 is not particularly limited as long as it is a polygonal shape. For example, it can be formed in a square shape such as a square, a rhombus, a parallelogram, or a triangular shape such as an equilateral triangle.

In the indexable insert 10 according to this embodiment, the first rake face 12 inclined downward from the cutting edge 11 and the second rake face 13 inclined more greatly than the first rake face 12 are formed. A continuous breaker is provided on the upper surface in the vicinity of the nose portion 14, and a triangular-shaped auxiliary projection is formed from the first rake face 12 near the nose portion 14 toward the breaker 15. 16 is provided over the second rake face 13 to the upper surface in the vicinity of the breaker 15, and as shown in FIG. 5, the inclination angle θ of the ridge line 16 a of the auxiliary projection 16 is The inclination angle θ1 and the second
The angle is set between the rake face 13 and the inclination angle θ2.

Here, as described above, the auxiliary projection 1 extending from the first rake face 12 near the nose portion 14 to the breaker 15 is provided.
When the auxiliary projection 16 is provided, the position at which the auxiliary projection 16 is provided differs depending on the conditions for cutting using the throw-away tip 10. However, when medium cutting is performed, the ridge line 16a of the auxiliary projection 16 From 1.0m
The auxiliary projection 16 is provided so as to be located at a distance of m to 1.5 mm, and the width d of the auxiliary projection 16 is set to be within a range of 0.3 mm to 1.0 mm.

The nose portion 14 of the indexable insert 10 and the cutting edge 11 near the nose portion 10 in this embodiment.
In performing the cutting by the normal medium cutting, the chips cut by the nose portion 14 and the cutting edge 11 in the vicinity thereof are cut from the first rake surface 12 to the second rake surface 13 and the above-mentioned auxiliary projections 16. The tip of the chip led to the auxiliary projection 16 on the side of the nose 14 is lifted by the slope 16 b of the auxiliary projection 16 on the side opposite to the nose part 14 side, and the chip is cut by the cutting. The first and second rake faces 12 of the cutting blade 11 on the side adjacent to the blade 11,
13 is prevented, and the chips are smoothly guided from the auxiliary projections 16 to the breaker 15, whereby the chips are appropriately curled and cut.

On the other hand, using the indexable insert 10 of this embodiment, the nose portion 14 and the cutting edge 1 in the vicinity thereof are used.
In the case where the cutting with a low cutting depth of about 0.5 mm is performed according to 1, the chips cut by the above-mentioned cutting edge 11 are transferred from the first rake face 12 to the second rake face 13 and the auxiliary projections 16. When the chips are appropriately curled and cut by the inclined surface 16 c of the auxiliary projection 16 on the nose portion 14 side, the chips thus cut are discharged, and cutting with a low cut is performed. In this case, it is also possible to prevent chips from clogging and damage the cutting blade 11 and the like.

Next, an example using the throw away tip 10 in the above embodiment shown in FIGS. 4A, 4B and 5 and the throw shown in FIGS. 3A and 3B will be described. By comparing with a comparative example using the away tip 10c, it is clarified that stable cutting can be performed for a long time when cutting is performed using the indexable tip of the embodiment of the present invention.

Here, these throw-away chips 1
At 0 and 10c, the flank 18 is made vertical, and the inclination angle θ1 of the first rake face 12 is set to 5
°, and the inclination angle θ2 of the second rake face 13 was set to 20 °.

The throw-away tip 1 of the embodiment
In the case of No. 0, when the triangular mountain-shaped auxiliary projection 16 is provided from the first rake face 12 near the nose portion 14 to the breaker 15, the ridge line 16a is
An auxiliary projection 16 having a width d of 0.7 mm was provided at a position 1.5 mm away from the position 4, and the inclination angle θ of the auxiliary projection 16 was set to 10 °.

On the other hand, the throw away tip 10 of the comparative example
In (c), the columnar projection 17b is provided on the upper surface near the nose portion 14 from the second rake face 13 toward the breaker 15, and the center line of the columnar projection 17b is positioned 1.5 mm away from the nose portion 14. And the width at the bottom is about 0.5 mm and the length is about 0.8 mm
Thus, a columnar projection 17b having a height of about 0.14 mm was provided.

Then, under the conditions of a cutting speed of 150 m / min and a cutting depth of 2.5 mm, the work material of the SCM400 having four grooves is cut by the indexable inserts 10 and 10c of the above-described embodiment and comparative example. Each time the number of impacts by the groove formed in the material reaches 100, the feed rate is increased by 0.1 mm / rev and cutting is continued until the indexable inserts 10 and 10c of the example and the comparative example are broken. And the feed speed at that time.

As a result, in the indexable tip 10c of the comparative example, the feed rate was 0.4 mm / re.
v, the breakage occurred when the cumulative number of impacts was 432, whereas the indexable tip 10 of the above embodiment had a feed rate of 1.1 mm / rev and a cumulative number of impacts of 1136. Breakage occurred at that point, and stable cutting could be performed over a longer period of time as compared with the indexable insert 10c of the comparative example.

[0031]

As described above in detail, according to the present invention, a cutting edge is formed at the outer edge of the upper surface in the shape of a plane polygon, and a first rake face inclined downward from the cutting edge; A second rake surface that is more greatly inclined is formed continuously, and in a throwaway chip provided with a raised breaker on the upper surface near the nose portion, the first rake surface near the nose portion faces the breaker. Since the mountain-shaped auxiliary projection is formed, when chips cut by the nose portion and the cutting blade in the vicinity thereof are guided to the auxiliary projection from the first rake face, the chips are clogged by the auxiliary projection. And the chips were smoothly guided to the auxiliary projections.

In the cutting of the indexable insert of the present invention with the nose and the cutting edge in the vicinity thereof, if the cutting amount is reduced and the feed speed is increased, the cutting is performed by the nose and the cutting edge in the vicinity thereof. The cut chips are smoothly guided from the first rake face to the auxiliary projections, and the chips on the side of the nose portion of the auxiliary projections are appropriately curled and cut. Even when medium cutting is performed, the chip is prevented from being elongated or clogged.

When ordinary cutting is performed by the indexable insert according to the present invention, chips cut by the nose portion and the cutting blade near the nose portion are smoothly guided from the first rake face to the auxiliary projection, Further, the chips are guided to the breaker from the auxiliary projection, and the chips are appropriately curled and cut by the breaker, and are guided to the auxiliary projection by the slope of the auxiliary projection opposite to the nose side. The nose of the chip is lifted up and the chip collides with the first and second rake faces of the cutting edge adjacent to the cut edge, and these rake faces are plastically deformed. It has also been prevented from being damaged or lost.

Further, in the indexable insert of the present invention, the inclination angle θ of the ridge line of the auxiliary projection and the first
Since the inclination angle θ1 of the rake face and the inclination angle θ2 of the second rake face satisfy the condition of θ1 <θ <θ2, when chips guided to the auxiliary projection flow on the auxiliary projection, This prevents the auxiliary projections from being worn, without adding significant resistance to the chips, and the cut chips are guided smoothly over the auxiliary projections, reducing the load applied during cutting. As a result, the cutting blade and the like are prevented from being damaged.

As a result, in the indexable insert of the present invention, in addition to ordinary cutting, when cutting with a reduced cutting depth and an increased feed rate is performed, in particular, in addition to ordinary ordinary cutting, When performing high-feed medium cutting at low depth of cut, chips are not clogged or fused, and the cut chips are properly cut and discharged, resulting in stable cutting for a long time. Now you can do it.

[Brief description of the drawings]

FIGS. 1A and 1B are a partial plan view and a partial perspective view showing a state near a nose portion of a conventional throw-away tip having a planar polygonal shape.

FIG. 2 is a partial plan view showing a state in which a truncated conical small projection is provided between a breaker and a second rake face on the upper surface near a nose portion in a conventional indexable insert having a planar polygonal shape; It is a partial perspective view.

FIGS. 3A and 3B are a partial plan view and a partial perspective view showing a state where a columnar projection is provided on a top surface near a nose portion from a second rake face toward a breaker in a conventional throw-away tip having a planar polygonal shape. .

FIG. 4 is a partial plan view and a partial perspective view showing a state near a nose portion of the throw-away tip according to one embodiment of the present invention.

FIG. 5 is a diagram showing a relationship among an inclination angle θ of a ridge line in an auxiliary projection, an inclination angle θ1 of a first rake face, and an inclination angle θ2 of a second rake face in the throw-away tip according to the embodiment. is there.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Throw-away tip 11 Cutting edge 12 First rake face 13 Second rake face 14 Nose part 15 Breaker 16 Auxiliary protrusion 16a Ridge of auxiliary protrusion θ Angle of inclination of auxiliary projection θ1 Angle of inclination of first rake surface θ2 Second rake Angle of inclination d Width of auxiliary projection

Continued on the front page (72) Inventor Toshiya Nakata 2-1-1-18 Kamihigashi, Hirano-ku, Osaka Dai-Jet Industrial Co., Ltd. F-term (reference) 3C046 AA01 CC01 CC06 JJ04

Claims (3)

[Claims] 1. A cutting edge 11 on the outer edge of an upper surface of a plane polygonal shape.
Are formed, a first rake face 12 inclined downward from the cutting edge 11 and a second rake face 13 inclined larger than the first rake face 12 are continuously formed, and the nose portion 14 In a throw-away chip having a raised breaker 15 provided on the upper surface of the upper surface, an auxiliary projection 16 having a mountain shape is formed from the first rake face 12 near the nose portion 14 toward the breaker 15. The inclination angle θ of the ridge line 16a of the projection 16, the inclination angle θ1 of the first rake face 12, and the inclination angle θ2 of the second rake face 13 satisfy the condition of θ1 <θ <θ2. A throw away tip characterized by the following. 2. The indexable insert according to claim 1, wherein the inclination angle θ of the ridge line 16a of the auxiliary projection 16 is:
A throwaway tip, wherein the inclination angle θ1 of the first rake face 12 and the inclination angle θ2 of the second rake face 13 satisfy the condition of θ1 + 3 ° ≦ θ ≦ θ2-5 °. 3. The indexable insert according to claim 1, wherein said auxiliary projection has a width d of 0.3.
A throw-away tip having a size in the range of 1.0 mm to 1.0 mm.