JPS6234707A - Throw away tip - Google Patents

Abstract

PURPOSE:To manufacture tips having various nose radiee and capable of performing chip processing excellently by use of one mold by providing a first chip breaker on one blade section at least on upper and lower faces and a second chip breaker, in addition, on a central land section. CONSTITUTION:A stepping face 7 is formed behind a cutting edge 6 having a nose radium R3 of 0.4mm and a slant face 7a, in addition, at the rear end of the cutting edge by means of a triangular throw away tip 5. And a convex chip breaker 9 is provided inside the slant face 7a on a central land section 8. When the cutting edge having a nose radius of 0.4mm is used, the stepping face 7 and the slant face 7a work as a ship breaker performing chip processing excellently, and in cutting with a new cutting edge 6a having a nose radium of 0.8mm after being polished, the stepping face 7 and slant face 7a are lost, and the chip breaker 9 performs chip processing excellently. This method can be applied effectively also to all other kinds of cutting edges and all kinds of tips such as square tip, rhombus tip and so on.

Description

DETAILED DESCRIPTION OF THE INVENTION No. 1111 [Field of Industrial Application] The present invention relates to a throw-away depth with a chip breaker.

[Prior Art] Indexable inserts having a chip breaker at the cutting edge have been used for the purpose of good chip disposal. In such an indexable tip,
When using tips with different nose radii depending on cutting conditions, indexable tips with various nose radii are required.

[Problems to be Solved by the Invention] In such conventional indexable inserts, if the nose radius is made larger by polishing or the like, the position of the chip breaker will be closer to the cutting edge, and when cutting with the insert, chips will be 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 indexable tip of FIG. 4 polished to a larger nose radius.

As shown in the figure, the nose radius R1 of the indexable tip
is the distance from the small sharpening edge 1 to the convex chip breaker 2 @
However, if the indexable tip is polished to make the nose radius R2 larger, the distance from the cutting edge 3 to the convex chip breaker 4 becomes shorter, 11b, resulting in extremely poor chip control, especially during light cutting. Even if the indexable tip provided with the chip breaker was polished and changed to a larger nose radius, it was extremely difficult to obtain a tip suitable for cutting.

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

Therefore, the present invention has been made with the object of providing an indexable tip that can provide a plurality of nose radii with one cutting edge.

Standing 1J and Type 1 2 [Means for Solving the Problems] In order to achieve the above object, the present invention has the following configuration as a means for solving the above problems.

That is, a first chip breaker (7, 7a) is formed on at least one blade portion on the upper and lower surfaces, and corresponds to the blade portion of the central land portion (8) that is connected to the first chip breaker (7, 7a). The second chip breaker (9) is provided in the indexable position.

[Function] When cutting with a predetermined nose radius, the indexable insert of the present invention has a first chip breaker (7° 7a) provided in accordance with the cutting edge of the nose radius to be treated with glue chips. If this is done well and the nose is ground to a larger nose radius, the second chip breaker (9) pre-formed on the central land (8) will ensure good chip removal. work.

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

FIG. 1(A) is a plan view of the cutting edge of an indexable insert as an embodiment of the present invention, and FIG.
2 (A> is a plan view of the cutting edge of the polished indexable tip shown in FIG. 1 (A), and FIG. 2 (
B) is a CC sectional view of FIG. 2 (A>).

As shown in FIGS. 1(A) and 1(B), the indexable tip 5 is a triangular positive type, and the nose radius R3 is Q, 4 mm at the time of manufacture from the mold. This indexable tip 5 is provided with a stepped surface 7 at the rear of the cutting edge 6, and the rear end of the stepped surface 7 (the cutting edge 6).
An inclined surface 7a is formed at a position within 4 mm from Q. In this embodiment, the step surface 7 is inclined by 2 degrees from the cutting edge 6 toward the central land portion 8, but it may be inclined downward. In the central land portion 8, inside the position of the slope 7a,
A convex chip breaker 9 is provided.

The indexable tip 5 of this embodiment configured as described above is left as is, that is, the nose radius of the cutting edge 6 is set to 0.4 m.
When used as a chip breaker, the stepped surface 7 and the inclined surface 7a play a role as a chip breaker, so that chips can be effectively removed. On the other hand, the cutting edge 6 has a nose radius of 0.8n.
When used by polishing to ua, the step surface 7 is polished by polishing.
and the inclined surface 7a is completely removed, as shown in FIG. 2(A).
, (B), a new cutting edge 6a is formed, and the chip breaker 9 performs good chip removal during cutting.

Next, a second embodiment of the present invention will be described. Figure 3 (A
) is a plan view showing the cutting edge of the indexable tip according to the second embodiment, and FIG. 3(B) is a sectional view taken along line CC in FIG. 3(A).

As shown in the figure, the indexable tip 11 with a nose radius R5 of Q and 4 mm is provided with a stepped surface 13 behind the cutting edge 12, and furthermore, the rear end of the stepped surface 13 (below the cutting edge 12).
．． An inclined surface 13a is formed at a position within 4IIIl. A stepped surface 14 is provided continuously to the inclined surface 13a, and furthermore, the rear end of the stepped surface 14 (0.00 mm from the cutting edge 12) is provided.
(position between 4mm and 0.8mra) has an inclined surface 14a.
is formed.

A chip breaker 16 is provided in the central land portion 15 and has a convex shape inward from the position of the inclined surface 14a.

The indexable tip 11 of the second embodiment configured as described above is left as it is, that is, the nose radius of the cutting edge 12 is set to 0.
．． When used as a 4II11, the stepped surface 13 and the inclined surface 13a serve as a chip breaker, so that good chip removal is achieved. On the other hand, when the cutting edge 12 is ground so that the nose radius R6 becomes 0°8IIIl, the stepped surface 13 and the inclined surface 13a are completely removed by the rtlI polishing, and the stepped surface 14 and the inclined surface 14 are completely removed.
Since a acts as a chip breaker, good chip removal is achieved. Furthermore, the cutting edge 12 is adjusted to the nose radius R.
When used after polishing so that 7 is 1.2 mm, r
The step surface 13.14 and the inclined surface 13a are formed by grinding.

14a is completely removed, and the convex chip breaker 16 provides good chip removal.

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

Incidentally, the convex chip breaker 9.16 may be a concave chip breaker, and the position of the chip breaker may be selected from the position of the cutting edge of the abrasive pattern to the optimum size according to the processing conditions. Furthermore, it goes without saying that the indexable 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 indexable tip, and the shape of the tip plate is not limited to a triangular shape, but may be a square shape, a rhombus shape, or a polygonal shape.

The chip material 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.

As described in detail above, the indexable insert of the present invention is provided with a plurality of chip breakers so that the re-nose radius can be changed by polishing etc. while maintaining good chip control. This has the effect of increasing the depth of the nose radius by +y. Furthermore, the throw-away tip of the present invention has conventionally
It also has the effect of being able to manufacture products using one mold instead of those that used to be manufactured using multiple molds.

[Brief explanation of the drawing]

Fig. 1(A) is a plan view of the cutting edge of a slow 7-way tip as an embodiment of the present invention, and Fig. 1(B) is a plan view of the cutting edge of a slow 7-way tip as an embodiment of the present invention.
2 (A) is a plan view of the cutting edge after polishing the indexable tip of FIG. 1 (A>), and FIG. 2 (B)
2(A) is a cross-sectional view taken along the line CC in FIG. 2(A), FIG. 3(A) is a plan view of the cutting edge of an indexable tip as another embodiment of the present invention, and FIG. A) is a C-C cross-sectional view, Figure 4 is a plan view of the cutting edge of an indexable insert with a small nose radius, and Figure 5 is a plan view of the cutting edge of the indexable tip in Figure 4 ground to a large nose radius. . 1.3.6.6a, 12... Cutting edge 2.4.9.16... Convex chip breaker 7.13.
14...Stepped surface

Claims (1)

[Claims] 1. A throw-away tip in which a first chip breaker is formed in at least one blade portion on the upper and lower surfaces, and a second chip breaker is provided at a position corresponding to the blade portion in the central land portion continuous with the first chip breaker. .