JPH03162B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention [Field of Industrial Application] The present invention relates to a throw-away chip with a chip breaker.

[Prior Art] Throw-away tips with a chip breaker provided at the cutting edge have conventionally been used for the purpose of good chip disposal. When using such throw-away tips having different nose radii depending on the cutting conditions, throw-away tips having various nose radii are required.

[Problems to be Solved by the Invention] In such conventional throw-away chips, if the nose radius is made larger by polishing or the like, the position of the chip breaker becomes closer to the cutting edge, and when cutting is performed with the tip, chips are generated. There was a problem that the processing was not carried out properly.

FIG. 4 is a plan view of the cutting edge of a throw-away tip having a convex chip breaker with a small nose radius, and FIG. 5 is a plan view of the throw-away tip shown in FIG. 4 polished to a larger nose radius. As shown in the figure, when the nose radius R1 of the throw-away tip is small, the distance from the cutting edge 1 to the convex chip breaker 2 is a distance a, but when the throw-away tip is polished and the nose radius R2 is made larger, the convex chip breaker 2 extends from the cutting edge 3. 4, the distance b becomes short, and chip disposal becomes extremely poor, especially during light cutting. Even if the throw-away tip provided with the tip breaker was polished to have a larger nose radius, it was very difficult to obtain a tip suitable for cutting.

Therefore, there is a problem in that a mold for manufacturing the throw-away tip is also required depending on the nose radius.

SUMMARY OF THE INVENTION Therefore, the present invention has been made with the object of providing a throw-away tip that can provide a plurality of nose radii with a single cutting edge.

Structure of the Invention [Means for Solving the Problems] In order to achieve the above object, the present invention has the following structure as a means for solving the above problems.

That is, the first blade, which serves as a breaker for the first blade, is located inside the first blade at the tip of the throw-away tip.
The throw-away chip is provided with a chip breaker, wherein a first chip breaker having a diameter larger than that of the first blade is curved in the direction of the first blade, inside the first blade. The first chip breaker is provided in a convex shape, the first chip breaker is formed as a second blade part, and a second chip breaker is provided inside the second blade part to serve as a breaker for the second blade part. The structure of the throw-away tip is characterized by:

[Function] When cutting with the nose radius of the first blade part of the throw-away chip of the present invention, the first chip breaker 7, 7a provided according to the nose radius of the first blade part When the chip processing is performed well and the nose is ground to make the nose radius of the second blade part larger than that of the first blade part, the second chip breaker formed in advance in the central land part 8 9 works to ensure good chip disposal.

[Example] Examples of the present invention will be described below based on the drawings.

FIG. 1A is a plan view of the cutting edge of a throw-away tip as an embodiment of the present invention, FIG. 1B is a sectional view taken along the line C-C of FIG. 1A, and FIG. FIG. 2B is a plan view of the cutting edge of the away tip after being ground. FIG. 2B is a sectional view taken along the line CC in FIG. 2A.

As shown in FIGS. 1A and 1B, the throw-away tip 5 is a triangular positive type, and the nose radius R3 is 0.4 when manufactured from a mold.
mm. This throw-away tip 5 is provided with a stepped surface 7 at the rear of the cutting edge 6, and furthermore, an inclined surface 7a is formed at the rear end of the stepped surface 7 (at a position within 0.4 mm from the cutting edge 6). There is. In this example,
Although the step surface 7 is sloped upward from the cutting edge 6 toward the central land portion 8, it may be sloped downward. A convex chip breaker 9 is provided in the central land portion 8 on the inside of the slope 7a.

When using the throw-away tip 5 of this embodiment configured as described above as is, that is, with the nose radius of the cutting edge 6 being 0.4 mm, the step surface 7
Since the inclined surface 7a also functions as a chip breaker, good chip removal is achieved. On the other hand, when the cutting edge 6 is ground to a nose radius of 0.8 mm, the step surface 7 and the inclined surface 7a are polished.
Since the chips are completely removed, a new cutting edge 6a is formed as shown in FIGS. 2A and 2B, and the chip breaker 9 performs good chip removal during cutting.

Next, a second embodiment of the present invention will be described. Fig. 3A is a plan view showing the cutting edge of the throw-away tip as the second embodiment, and Fig. 3B is the C of Fig. 3A.
-C sectional view.

As shown in the figure, the throw-away tip 11 with a nose radius R5 of 0.4 mm is provided with a stepped surface 13 behind the cutting edge 12, and the rear end of the stepped surface 13 (a position within 0.4 mm from the cutting edge 12). has an inclined surface 13
a is formed. A stepped surface 14 is provided continuously to the inclined surface 13a, and furthermore, the rear end of the stepped surface 14 (a position between 0.4 mm and 0.8 mm from the cutting edge 12)
An inclined surface 14a is formed on the surface. Central land area 1
5 is provided with a convex chip breaker 16 inward from the position of the inclined surface 14a.

When the throw-away tip 11 of the second embodiment configured as described above is used as it is, that is, with the nose radius of the cutting edge 12 being 0.4 mm, the stepped surface 13 and the inclined surface 13a serve as a chip breaker. This results in good chip removal. On the other hand, the nose radius R6 of the cutting edge 12 is 0.8 mm.
When used after polishing, the step surface 13 and the sloped surface 13a are completely removed by the polishing, and the step surface 14 and the slope surface 14a serve as a chip breaker, resulting in a good cut. Powder processing is performed. Furthermore, the nose radius R7 of the cutting edge 12 is
When used after being polished to a thickness of 1.2 mm, the stepped surfaces 13, 14 and the inclined surfaces 13a, 1 are polished by polishing.
4a is completely removed and the convex chip breaker 16
This allows for better chip disposal.

In the second embodiment, throwaway chips with three different nose radii can be obtained by polishing with one mold.

Incidentally, the convex chip breakers 9 and 16 may be convex chip breakers, and the position of the chip breakers is as follows.
The optimum dimensions can be selected based on the cutting edge position after polishing and the processing conditions. It goes without saying that the throwaway tip can be constructed by combining various nose radii. Furthermore, it is not limited to one cutting edge, but can be provided on all cutting edges of the throw-away tip, and the shape of the tip plate is not limited to a triangular shape, but may be square, diamond-shaped, or polygonal. The material of the chip is not limited to ceramic, but may also be cemented carbide or the like.

Although several embodiments of the present invention have been described above, the present invention is not limited to these embodiments in any way, and can be implemented in various forms without departing from the gist of the present invention. Of course.

Effects of the Invention As detailed above, the throw-away chip of the present invention is provided with a plurality of chip breakers, so that the nose radius can be changed by polishing or the like while maintaining good chip control. It has the effect of giving you chips. Furthermore, the throw-away chip of the present invention has the advantage that it can be manufactured with one mold instead of conventionally manufactured with a plurality of molds.

[Brief explanation of drawings]

FIG. 1A is a plan view of the cutting edge of a throw-away tip as an embodiment of the present invention, FIG. 1B is a sectional view taken along the line C-C in FIG. 1A, and FIG. FIG. 2B is a sectional view taken along line CC in FIG. 2A; FIG. 3A is a plan view of the cutting edge of a throw-away tip as another embodiment of the present invention; Figure B is a CC sectional view of Figure 3A, Figure 4 is a plan view of the cutting edge of the throw-away tip with a small nose radius, and Figure 5 is the cutting edge of the throw-away tip in Figure 4 ground to a large nose radius. FIG. 1, 3, 6, 6a, 12...Blade edge, 2, 4, 9,
16... Convex chip breaker, 7, 13, 14... Step surface, 7a, 13a, 14a... Inclined surface.

Claims (1)

[Scope of Claims] 1. A throw-away tip that is provided with a first chip breaker that serves as a breaker for the first blade portion inside the first blade portion at the tip of the throw-away tip, which comprises: A first chip breaker having a diameter larger than that of the first blade is provided inside the blade in a convex shape curved in the direction of the first blade, and the first chip breaker is connected to a second blade. 1. A throw-away tip, characterized in that the throw-away tip is formed as a section, and further includes a second chip breaker that serves as a breaker for the second blade section inside the second blade section.