JP2000280107A - Cutting insert - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the tool lifetime while improving the cutting chip processing ability by providing a side surface of a breaker upheaved part with a part standing at an angle in a specified range. SOLUTION: A breaker upheaved part 10 is arranged so that a distance (d) from a tip of a nose part 5 to a sanding boundary of the breaker upheaved part 10 is formed at 0.3-0.7 mm in relation to the nose part 5. Cutting angle Αis set at 3-16 degree, and standing angle α of a front surface of the breaker upheaved part 10 facing to a tip of the nose part 5 is set at 20-40 degree. Cutting angle of a lateral cutting blade is set at 3-16 degree, and a side surface of the breaker upheaved part 10 is formed with a part standing at 30-60 degree. Cutting chips having a large width while being cut large is energized so as to be curled by the cutting face of the lateral cutting blade having a cutting angle, and made to collide with a side surface of the breaker upheaved part 10 stood at a large standing angle so as to be securely curled. Even if cutting depth is increased, breakdown of the breaker upheaved part 10 and clogging with cutting chips can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting insert which is detachably mounted on a tool body and used for cutting a metal material or the like.

[0002]

2. Description of the Related Art Conventionally, STKM13A, SCM41
For processing of a sticky material, such as 5, SS400, which is difficult to process chips, a cutting insert having a nose with a raised breaker has been used.

FIG. 5 shows the shape of a nose portion 21 of such a conventional cutting insert 20. As shown in FIG.
The distance A between the tip cutting edge 22 and the breaker ridge 23 is reduced, while the distance B between the breaker ridge 23 and the horizontal cutting edge 24 is gradually increased as the distance from the tip cutting edge 22 increases. there were. This cutting insert 20
The main object of the present invention is to reduce the distance A between the leading edge cutting edge 22 and the breaker ridge 23 to reduce the depth of cut so as to cope with the processing of chips in a finishing area having a low depth of cut.

FIG. 6 shows the shape of a nose portion 31 of another conventional cutting insert 30. As shown in FIG.
The distance A 'between the tip cutting edge 32 and the breaker ridge 33 is relatively large, while the breaker ridge 33 is relatively large.
And the distance B 'between the horizontal cutting edge 34 and the horizontal cutting edge 34 was made smaller.

The main purpose of this cutting insert 30 is to reduce the distance B 'between the breaker ridge 33 and the transverse cutting edge 34 to cope with the chip processing in the medium to high feed medium and rough machining region.

[0006]

However, in the cutting insert 20 shown in FIG. 5, the tip cutting edge 22 and the breaker ridge 23 are provided.
Chips are elongated by medium roughing, and the distance B between the breaker ridge 23 and the horizontal cutting edge 24 is equal to the tip cutting edge 22.
Although it was made to gradually increase with distance from the steel, it was said that the chip processing in the medium roughing was excellent.

Further, in the cutting insert shown in FIG. 6, since the distance A 'between the tip cutting edge 32 and the breaker ridge 33 is large, chips are reliably caught on the tip of the breaker ridge 33 in the middle roughing process. The chip was curled with a small curl radius on the side wall of the breaker raised portion 33 disposed closer to the horizontal cutting edge 34 to make it easier to break. However, in the chip processing in the finishing area, the curl radius of the chip became too large. There was a problem that it was hard to break.

Further, these cutting inserts 20, 30
In each case, the breaker ridges 23 and 33 and the chips were in point or line contact with each other, and the direction in which the chips were discharged was not stable, and in some cases, the chips became difficult to break.

[0009]

SUMMARY OF THE INVENTION In view of the above problems of the prior art, the present invention provides
An object of the present invention is to provide a cutting insert which has excellent chip controllability not only in finishing but also in medium roughing and has a long tool life.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems in the prior art, a cutting insert according to the present invention includes a nose portion having a corner cutting edge and a horizontal cutting edge connected to both ends of the corner cutting edge, and a rake face thereof. The distance from the tip of the nose to the rising boundary of the breaker ridge is 0.3 mm to 0.7 mm, the rake angle is 3 ° to 16 °, and the nose is The rise angle of the front of the breaker ridge facing the tip of the section is 20 ° to 40 °, the rake angle of the transverse cutting edge is 3 ° to 16 °, and the part with a rise angle of 30 ° to 60 ° on the side of the breaker ridge It is characterized by having been provided.

[0011]

According to the cutting insert of the present invention, the squeeze angle from the tip of the nose to the rising boundary of the breaker ridge is slightly reduced, the distance is increased, and the rise of the front of the breaker ridge facing the nose tip is sharp. For example, at the time of small cutting in a nose radius large type insert having a relatively wide chip width, the chip slides on the rake face at a shallow angle in the small cutting. At this time, the chip is decelerated and collides with the rising portion (breaker raised portion 10) to curl the chip to a small size and cut it.

In addition, a chip having a large notch and a large width may be damaged by the chip or clogged with a breaker having a large rake angle and a sharp rising portion, because the chip cannot flow along the rising. There was. At that point, the chip speed is reduced by contact with the shallow corner of the squeeze, and the chip is curled and cut by hitting the rising part, so that the breaker ridge front side is not damaged and the chip is clogged. Nor.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 4 show a cutting insert 1 according to the present embodiment. As shown in FIG. 1, the entire shape of the cutting insert 1 has a cutting edge 4 on a ridge between a rake face 2 and a flank 3. An arc-shaped tip cutting edge 6 is formed at the tip of each of the nose portions 5 arranged at target positions, and a tip cutting edge 6 is formed on both sides of the tip cutting edge 6. Are formed respectively.

The nose portion 5 is provided with a breaker raised portion 10 facing the tip cutting edge 6 and raised from a rake face thereof, as shown in a partially enlarged view of FIG.

As shown in FIG. 3, the breaker raised portion 10 has a breaker raised so that the distance d from the tip of the nose portion 5 to the rising boundary of the breaker raised portion 10 is d = 0.3 mm to 0.7 mm. The part 10 is disposed with respect to the nose part 5 and the rake angle α is 3 ° to 16 °.
Angle γ in front of breaker ridge 10 facing the tip of
Is set to 20 ° to 40 °.

Further, as shown in FIG. 4, a portion having a rake angle β of the transverse cutting edge 7 of 3 ° to 16 ° and a rising angle θ of 30 ° to 60 ° is provided on the side surface of the breaker raised portion 10. .

In the cutting insert 1 configured as described above, the breaker bulge 1
Distance d to the rising boundary of 0 d = 0.3 mm to 0.7
mm, and the rake angle α of the tip cutting edge 6 is 3 ° to 16 °.
The reason for this is to ensure that the chip is curled even with a sticky material at low cutting depth. In addition, the rising angle γ of the front of the breaker raised portion 10 facing the tip of the nose portion 5 is set to a slightly large inclination of 20 ° to 40 ° because when the chip slides on a shallow angled rake face, the chip is decelerated. By colliding with the rising part (breaker raised part 10),
This is because the chips are curled into small pieces and cut. Therefore, according to the cutting insert 1, the chip is surely curled even with a sticky material at the time of cutting at a low depth of cut.
Since the chip processing direction is stabilized and chips are easily broken, good chip processing is possible.

The rake angle α of the tip cutting edge 6 is 3 °.
If the value is less than the predetermined value, there is a problem in that the chips are not sufficiently bent and the chips are extended without being curled. On the other hand, even if the rake angle α exceeds 16 ° and the groove becomes deep, there is a problem that the chip is not bent sufficiently and as a result, the chip extends without curling.

When the rising angle γ in front of the breaker ridge 10 is less than 20 °, chips are
There is a problem in that it flows so as to rub the front of 0 and does not curl but extends. On the other hand, when the rising angle γ is greater than 40 °, the chips are cut for the time being, but are likely to be scattered, and the chip discharge direction is not stable. In addition, there is a problem that the breaker ridge 10 is easily damaged.

The distance d from the tip of the nose portion 5 to the rising boundary of the breaker ridge 10 is 0.3 mm.
If it is closer, the chip contacts the breaker ridge 10 before the chip flow rate is reduced, so that the breaker ridge 1
0 may be scraped off, while 0.7 mm
If it is larger, the chip and the breaker ridge 10 may not sufficiently contact at the time of low-cut cutting, and the chip may be easily extended.

Next, the rake angle β of the transverse cutting edge 7 is set to 3 ° to 3 °.
16 °, the rising angle θ on the side of the breaker ridge 10 is 30
The portion having an angle of 60 ° was provided because the chip having a large notch and a large width was curled by the rake face of the horizontal cutting edge 7 having a slightly large rake angle β. Furthermore, the rising angle θ of the large inclination following this
This is to ensure that it collides with the side surface of the breaker raised portion 10 and curls. At this time, as described above, the rise of the front of the breaker raised portion 10 is gentle, so that even if the cut is increased, the breaker raised portion 10 is not damaged and chips are not clogged.

If the rake angle β of the horizontal cutting edge 7 is less than 3 °, there is a problem that when the cut is large, the chips are extended without curling. On the other hand, the rake angle β is 16 °
Even when the groove is deeper than the above, when the depth of cut is large, there is a problem that the chip is insufficiently bent and the chip extends without curling.

Further, when the rising angle θ is less than 30 ° on the side surface of the breaker raised portion 10, there is a problem that when the chip has a large cut, the chip extends without curling.

On the other hand, when the rising angle θ exceeds 60 °,
When the chips have a large depth of cut, the chips are
In addition to the inconvenience that the chip breaks easily, the chip is easily scattered and the direction in which chips are discharged is not stable, and the breaker ridge 10 is easily damaged.

The embodiment of the present invention has been described above.
It is needless to say that the present invention is not limited to these embodiments, and can take any form without departing from the object of the invention.

[0027]

EXPERIMENTAL EXAMPLES Next, experimental examples for clarifying the effects of the present invention will be described.

In this example, the cutting insert 1 of the above embodiment was mounted on a tool holder to perform inner diameter cutting, and the processing ability of chips was observed and evaluated.

The processing conditions are as follows. : V (cutting speed) = 150 m / min d (cutting) = 0.5 to 2.5 mm f (feed) = 0.07 to 0.25 mm / rev WET Work material: SCM415 A cutting insert having the same shape. The inserts in which the rake angles α, β, the rise angles γ, θ, etc. were set as shown in Table 1 were designated as Comparative Examples 1 to 7, and the observation and evaluation were performed.

The results are shown in Table 1.

[0031]

[Table 1]

As shown in Table 1, in Comparative Example 1, the rising angle γ and the distance d from the tip of the nose to the rising boundary of the breaker bulge were out of the range of the present invention. Was extended.

In Comparative Examples 2 and 3, the rake angles α and β were out of the range of the present invention in the direction in which the rake angles were small.

The product of Comparative Example 4 was out of the range of the present invention in the direction in which the rake angles α and β were large, and as a result, there was a problem that chips were extended at small cutting.

The product 5 of Comparative Example had a rising angle γ outside the range of the present invention, and as a result, there was a problem that chips were elongated at the time of small cutting.

The comparative examples 6 and 7 have the rising angle θ out of the range of the present invention and are out of the range in the large direction.
There was a problem that chips were clogged at the time of cherishing, while the comparative example product 7, which was out of the range in the small direction, had a problem that chips were escalated at the time of valuing.

In the comparative example 8, the distance d from the tip of the nose to the rising boundary of the breaker bulge was out of the range of the present invention, and as a result, there was a problem that chips were clogged.

On the other hand, all the products of the examples had good results.

[0039]

As described above, according to the present invention, the squeeze angle from the tip of the nose to the rising boundary of the breaker ridge is reduced, the distance is increased, and the rise of the front of the breaker ridge facing the tip of the nose is reduced. Due to the slight steepness, at the time of small cutting, the flow rate of the chip is reduced at the tip, and further, the chip breaks into a small curl by flowing so as to rub the front of the breaker ridge.

Further, even when the cut is large, the flow velocity of the chip is also slow because the rake angle is gentle. Therefore, the chip having a large width collides with the side surface of the breaker protruding portion having a large rising angle and is surely curled. There is no damage on the front side of the raised portion, and no chips are clogged.

Accordingly, the cutting insert is excellent in not only finishing processing but also in medium roughing processing, and has a long tool life.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cutting insert of the present invention.

FIG. 2 is an enlarged view of a region L in FIG.

FIG. 3 is an XX diagram of FIG. 2;

FIG. 4 is a YY diagram of FIG. 2;

FIG. 5 is a plan view of a cutting nose portion of a conventional cutting insert, where (a) is a top view and (b) is a side view.

FIG. 6 is a plan view of a cutting nose portion of another conventional cutting insert, (a) is a top view, and (b) is a side view.

[Explanation of symbols]

 Reference Signs List 1 cutting insert 2 rake face 3 flank face 4 cutting edge 5 nose part 6 tip cutting edge 7 horizontal cutting edge 8, 9 rake face α, β rake angle γ, θ rising angle

Claims (1)

[Claims] 1. A cutting insert having a cutting edge formed at a ridge between a rake face and a flank, wherein a nose portion of the insert has a corner cutting edge and a transverse cutting edge connected to both ends of the corner cutting edge. The rake face is provided with a breaker ridge on the rake face, and the distance from the tip of the nose to the rising boundary of the breaker ridge is 0.3 mm to 0.7 mm.
And the rake angle is 3 ° to 16 °, and the rising angle at the front of the breaker ridge facing the tip of the nose is 20 ° to 40 °.
A cutting insert with a rake angle of 3 ° to 16 ° for the horizontal cutting edge and a section with a rise angle of 30 ° to 60 ° on the side of the breaker ridge.