JPS6037205Y2 - cutting insert - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting tool, particularly a shaped cutting insert, having a cutting profile with a novel shape designed to break up chips more effectively.

Recently, in new designs of cutting inserts, molded chip breakers in the cutting insert interrupt the free flow of metal being scraped from the workpiece.

It has been emphasized that there is no need to have internally located rising wall structures.

That is, it was found that the chips were naturally rolled up from the cutting insert and hit the workpiece, and were crushed without using a chip breaker.

An example of such a cutting insert that is well known in the art is shown in U.S. Pat. No. 3,973,307 to Mac Clean.

Cutting inserts of the type shown in the above-mentioned patents, although successful in their cutting action, are susceptible to cratering effects near the joints of the descending walls of flat beds when exposed to extreme cutting conditions, so that they eventually The usefulness of the cutting insert is lost.

Craters also interfere with the free flow of metal as they form, requiring increased horsepower to remove chips from the workpiece.

Also, as prior art, there is U.S. Pat.
The angle formed with the first descending wall 44 is 55 or less, and the first descending wall 44
The angle formed by the intermediate land 46 is in the range of 125 to 145 degrees, preferably 135 degrees, but since these angles are somewhat small for heavy cutting of hard materials, the flow of chips is not necessarily good. It was also thought that the strength of the blade itself was low and its lifespan was short.

In contrast, the present invention considers making the angle between the peripheral wall of the insert and the first descending wall and the angle between the intermediate land of the first descending wall larger than that of the above-mentioned U.S. patent. The angle with the first descending wall is 60
The angle between the first descending wall and the intermediate land is set to 150 degrees or more, thereby making the entire continuous surface from the cutting edge land to the intermediate land via the first descending wall gentle. , compared to the one disclosed in the above-mentioned US patent, allows chips to curl up naturally along the continuous surface of the insert, thereby avoiding the formation of depressions at specific locations on the insert.

According to the invention, the cutting tool, especially the shaped cutting insert, comprises:
Consists of a polygonal body of hard wear-resistant material having a top surface, a bottom surface and a peripheral wall joining the top and bottom surfaces.

At least one of the top and bottom surfaces has a cutting edge formed at a joint between the top surface and the peripheral wall, and a cutting edge land extends inward from the cutting edge.

A first descending wall portion is formed at an angle of greater than 60 degrees with the circumferential wall and extends inwardly from the cutting land area.

An intermediate land section is formed at an angle of 150 degrees or more with the first descending wall section and extends inwardly from the first descending wall section, and a second descending wall section is formed inwardly and downwardly from the intermediate land section. and joins the bottom land area of the insert.

Preferably, the cutting insert according to the invention has at least two angularly related cutting edges to define a plane, and the entire land area is substantially flat and has a 15-degree angle with the plane defined by the cutting edges. It has parallelism within degrees.

The width of the cutting edge land is preferably 0.002 to 0.020 inches (0.0508 to 508 mm), and the vertical distance from the plane of the cutting edge to the intermediate land area is 0.002 to 0.02 mm.
．． 015 inch (0,0508~0.381rran)
is within the range of

The preferred vertical distance from the middle runt area to the bottom land area is 0.005 to 0.030 inches (0.127 to 0.7
62rIr! n).

The width of the intermediate land area is preferably at least 1.5 times the width of the cutting edge land area, and most preferably about twice the width of the cutting edge land area.

Depending on the cutting conditions, the intermediate land area may have a maximum width near the corners of the polygonal insert or a maximum width between the corners of the insert.

Referring to the drawings, FIG. 1 shows an indexable insert 10 having a top surface 12, a bottom surface 14, and a peripheral wall 16 joining the top surface 12 and the bottom surface 14.

The insert can be made indexable and reversible within a tool holder (not shown).

The top surface 12 of the cutting insert 10 has a cutting edge 18 formed at the junction of the peripheral wall 16 and the top surface 12.

The cutting edge 18 of the insert 10 extends around the entire circumference of the polygonal insert 10 as shown.

Insert 10 is preferably formed from cemented carbide according to techniques well known in the art.

As shown in FIG. 2, in the cutting insert 10, the peripheral wall 16 joins the bottom surface 14 and the top surface 12.

Top surface 12 includes a cutting edge land 20 extending inwardly from cutting edge 18 toward the center of the insert.

The top surface 12 further includes a first descending wall portion 22 that extends downwardly and inwardly from the inner edge of the cutting land 20 toward the center of the insert and joins an intermediate land area 24 of the top surface 12. are doing.

An intermediate land area 24 is spaced apart from the cutting edge 18 of the insert such that metal being scraped from the workpiece impinges on the land area and from there curls upwardly against the workpiece, thereby causing it to fracture.

Top surface 12 further includes a second descending wall portion 26 that extends downwardly and inwardly from the inner edge of intermediate land area 24 toward the center of insert 10 and extends from the bottom land area of top surface 12 of insert 10 . It is joined to 28.

Preferably, the land area 2G, 24.28 is a substantially semi-spherical surface on the cutting insert 10 and the cutting edge 18 is 30.
．． It consists of cutting edges with an angular relationship such as 32.

All flat land areas have two angularly related cutting edges 30
．． It is preferable that the parallelism with the plane defined by 32 is within 15 degrees.

Referring again to FIG. 2, the cutting edge land area 20 has a width of 0.002 to 0.020 inches (0.0508 mm) as measured from the cutting edge toward the center of the insert when moderate cutting conditions are encountered. ~0.508 mm ) is preferable.

The intermediate land area 24 preferably has a width approximately twice the width of the cutting edge land area 20, as measured from the bottom of the first descending wall section 22 to the top of the second descending wall section 26.

If the land areas 20, 24, 28 are substantially planar, the vertical distance from each angular cutting edge of the insert 10 to the intermediate land 24 will be between 0.002 and 0.015 inches (0.0508 to 0.015 inches). 0.381 rrcn).

Additionally, the vertical distance from the flat intermediate land area to the flat bottom land area is 0,005 to 0.030 inch (0,
127 to 0.762 m).

When looking at the first descending wall portion 22 and the peripheral wall 16 in FIG. The wall portion 22 and the intermediate land 24 form an angle of 150 degrees or more.

Referring to FIG. 3, the cutting insert 10 has its top surface 1
2 has an intermediate land area 24 of varying width around the center of the insert.

As shown, the intermediate land area 24 is widest near the corners 36 of the insert 10.

Referring to FIG. 4, the cutting insert 10 is again shown having an intermediate land area 24 on the top surface 12, but in this case the intermediate land area is located at the corner 38 of the polygonal cutting insert 10 as shown. and the widest between 40 and 40.

Many modifications can be made within the scope of a utility model registration claim.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an insert according to the present invention. FIG. 2 is an enlarged cross-sectional view taken along the line ■--■ in FIG. FIG. 3 is a perspective view of an insert according to the present invention in which the width of the intermediate land area increases near the corners of the insert. FIG. 4 is a perspective view of an insert according to the present invention in which the width of the intermediate land area is increased between the corners of the insert. 10...Insert, 12...Top surface,
14...Bottom surface, 16...Peripheral wall, 18
(30, 32)... Cutting edge, 20.24.28.
... Land area, 22, 26 ... Descending wall section, 36.38.40 ... Corner.

Claims (1)

[Claims for Utility Model Registration] ■ Consisting of a polygonal body made of hard wear-resistant material, the polygonal body has a top surface, a bottom surface, and a peripheral wall joining the top surface and the bottom surface, and the top surface and the bottom surface At least one of the surfaces includes a cutting edge formed at a joint between at least one of the top surface and the bottom surface and the peripheral wall, a cutting edge land extending inward from the cutting edge, and the peripheral wall. a first descending wall portion formed at an angle of less than 60 degrees with said cutting edge land and extending inwardly from said cutting edge land; said first descending wall portion;
an intermediate land section formed at an angle of 0 degrees or more and extending inwardly from the first descending wall section; a second descending wall section extending inwardly from the intermediate land section; and a bottom land area extending inwardly from the second descending wall portion. 2. said insert has at least two angularly related cutting edges so as to define a plane, wherein all said land areas are substantially flat and said plane defined by said angularly related cutting edges; The cutting insert according to claim 1, further characterized in that the cutting insert has a parallelism of within 15 degrees. 3. The cutting insert according to claim 1, further characterized in that the cutting edge land has a width of 0.002 to 0.020 inches (0.0508 to 0.508 rrrm). 4. The vertical distance from the plane of the cutting edge to the intermediate land is 0.002 to 0.015 inch (0.0508 to 0.05 inch).
381rMt). 5. The vertical distance from the middle land area to the bottom land area is 0.005 to 0.030 inches (0.127 to 0.127 inches).
0.762771771). 6. The cutting insert according to claim 1, further characterized in that the width of the intermediate land area is 1.5 times or more the width of the cutting edge land area. 7. The cutting insert according to claim 6, further characterized in that the width of the intermediate land area is substantially twice the width of the cutting edge land area. 8. Utility model registration claim 1, further characterized in that the cutting edge extends from one corner of the polygonal body, and the intermediate land area is widest near the corner of the insert.
Cutting inserts as described in section. 9. Claim 9, further characterized in that the polygonal body has multiple corners from which the cutting edge extends and the intermediate land area is widest between the corners. The cutting insert described in item 1.