JP2548434Y2 - Indexable inserts for face milling - Google Patents

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 for a face mill, in particular, to reduce cutting resistance and increase fracture resistance.

[0002]

2. Description of the Related Art Conventionally, as a throw-away insert of this type for a face milling machine, for example, Japanese Patent Publication No. 47-51309 and Japanese Utility Model Publication No. 58-21608, in which a chip breaker is cut off with a grinding wheel, have both ends. Japanese Unexamined Utility Model Publication No. 1-14611 in the form of a groove is disclosed.

[0003]

However, these indexable inserts for face milling have a problem in that the chipping resistance is insufficient to reduce the cutting resistance due to cutting of steel or cast iron.

[0004] In view of the above, in the present invention, the fracture resistance is particularly improved.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and the narrow land formed along the entire circumference of the breaker groove has a land width l ₂ formed in the chamfer portion. For a land width l ₁ formed on the side, l ₂ ≧
The relationship is 1.5l ₁ . Further, cutting edges formed between these lands and the flank is the land width l ₂ moiety, is intended to honing to be equal to or smaller and the land width l ₁ portion is applied . In this case, the boss face formed at the center of the rake face preferably has a center height H with respect to the land.

[0006]

The indexable insert for the face milling machine according to the present invention reduces the cutting resistance as the breaker groove is formed all around. For the narrow land, the land width l _{2 of the} chamfer portion is larger than the land width l ₁ of the side portion.
However, since the height is increased in the relationship of l ₂ ≧ 1.5l ₁ and the cutting edge is subjected to the honing process, the fracture resistance is improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a throw-away tip for a face mill according to the present invention will be described below with reference to the drawings.

In FIG. 1 to FIG. 5, reference numeral 1 denotes a throw-away insert for a face mill having a substantially square plate shape. On the rake face side in cutting, an all-round breaker groove 2 is provided with a land 3 having a narrow width. And a boss surface 4 in the center.
Is to remain. The indexable insert 1 is, for example, a locator 13 which is screwed in a mounting groove 12 of a cutter body 11 as shown in FIG.
And secured by a wedge 15 with screws 14. In this case, a chamfer 5 having a horizontal relationship with the finished surface 17 of the work material 16 on a ridge line basis is formed at a corner portion of the throw-away tip 1. The chamfer 5 is shown in an enlarged manner in FIG. 5, but is connected to the side surface by an inclined surface 5a. But,
The inclined surface 5a may be a convex curved surface with roundness.

The land 3 of the throw-away tip 1 has different widths at the side portion and the chamfer 5 portion. In other words, the land width l ₂ of the chamfer 5 portion has a relationship of l ₂ > l ₁ with the land width l ₁ of the side portion. In this case, the land width l ₁ is set in a range of from 0.1 to 0.3 mm. Further, the reason to increase the land width l _2, in milling, because of the intermittent cutting, it is friendly to increase the chipping resistance.

Further, as shown in FIGS. 3 and 4, the circumferential breaker groove 2 of the throw-away chip has a width L of, for example, 2 mm or more, and a connection portion with the land 3 is formed as shown in FIG. , And a positive rake angle α, for example, a rake angle of 5 ° to 20 °. However, the curved surface with the radius of curvature R may be planar. It is preferable that the boss surface 4 has a center height H with respect to the land 3 from the standpoint of chip handling and chip seating. The core height H is usually 0.05 mm or more.

The indexable insert 1 constructed as described above is involved in cutting as shown in FIG.
Honing processing is applied to the intersection ridge between the land 3 and the flank. This honing process is illustrated by Figure 7 based on the land width _{l 1 (a) ~ (d} ). That is, in FIG. 7A, the angle honing is performed by β over the entire area of the land width l ₁ , and in FIG. 7B, the angle honing is performed from an intermediate portion of the land width l ₁ . Further, in FIG.
In addition to the angle honing over whole area round honing by a radius of curvature γ subjected, in FIG. 7 (d), the land width l ₁
Round honing with a radius of curvature γ is performed in addition to the angle honing from the middle. Then, the honing process is also performed on the chamfer 5 portion, but the honing amount is smaller than or equal to the width of the side portion. The reason why the size is reduced is that the chamfer 5 portion functions as a finishing blade. Further, as for the main body of the side portion and the chamfer 5 portion, those having changed shapes instead of the same shape specifications can be applied.

The indexable insert 1 constructed as described above can be applied not only to a substantially square plate as shown, but also to a triangular plate.

[0013]

According to the present invention, as described above, the width of the land 3 is made different between the side portion and the chamfer 5 portion, and the cutting edge is subjected to the honing process. Is improved in fracture resistance. Further, the formation of the all-circumference breaker groove 2 makes it possible to reduce the cutting resistance.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a throw-away tip for a face mill according to the present invention;

FIG. 2 is a side view,

FIG. 3 is a partially enlarged cross-sectional view taken along the line AA in FIG. 1;

FIG. 4 is a partially enlarged cross-sectional view similarly taken along line BB in FIG. 1;

FIG. 5 is a partially enlarged cross-sectional view of a circled C portion in FIG. 1;

FIG. 6 is a partial front view in which the indexable insert for the face milling of the present invention is incorporated in the cutter body.

FIG. 7 (a) shows the land honing process at the side of the indexable insert for the front milling cutter of the present invention.
Explanatory drawing shown by (d).

[Explanation of symbols]

 1 Throw-away tip 2 Breaker groove all around 3 Land 4 Boss surface 5 Chamfa

Claims (2)

(57) [Scope of request for utility model registration] 1. A chamfer 5 which has a polygonal plate shape and has a horizontal relationship with a finished surface of a work material at a corner portion thereof, and a chamfer side on a cutting surface,
A full-circumference breaker groove 2 is formed via a narrow land 3,
At the center thereof, a throw-away tip for a face mill having a boss surface 4 remaining,
Is such that the land width l ₂ formed in the chamfer 5 portion has a relationship of l ₂ ≧ 1.5l ₁ with respect to the land width l ₁ formed in the side portion, and the land 3 and the flank face the cutting edges formed by the intersection of, Te is the land width l ₂ parts, indexable insert for face milling, wherein a honing process to be equal to or small land width l ₁ portion is applied . 2. The indexable insert for a face mill, wherein the boss surface 4 according to claim 1 has a center height H.