RU2287410C1 - Cutting tip - Google Patents

Abstract

FIELD: working materials by milling, built-up end milling cutters.

SUBSTANCE: double-side cutting tip in the form of rhomb is restricted by two end faces and by lateral surface and it has in each end side supporting surface and front surface and also two first cutting edges and two second cutting edges. In each acute angle of rhomb first edge is joined with second edge along angular radius cutting edge. Invention provides enhanced reliability of fastening cutting tip in seat of body of milling cutter due to increased cutting efforts forcing it to lateral supporting surfaces of seat. In order to realize it, on front surface adjacent to second edge at least one protrusion is formed. Apex of said protrusion is arranged on said lateral surface and it is shifted along base of protrusion on second cutting edge relative to its middle towards obtuse angle of rhomb.

EFFECT: enhanced reliability of fastening cutting tip.

5 dwg

Description

The invention relates to the field of processing materials by milling, prefabricated end or face mills.

Known indexable double-sided cutting plate in the form of a rhombus, bounded by two end faces and a side surface and having on each end side a supporting surface and a front surface, two first cutting lumps and two second cutting edges, while in each of the sharp corners of the rhombus the first edge is connected to second edge along the radius of the radius of the cutting edge (see WO 2004/048021, 23 C 5/20, 2004).

However, when machining with a feed direction oblique to a plane perpendicular to the axis of the cutter, the cutting insert can be pulled out of the slot of the cutter body.

The objective of the invention is to increase the reliability of fixing the cutting insert in the socket of the cutter body by increasing the cutting forces pressing the cutting plate to the side support surfaces of the socket of the cutter body.

The problem is solved in that in an indexable bilateral cutting insert in the form of a rhombus, bounded by two end faces and a side surface and having on each end side a supporting surface and a front surface, two first cutting lumps and two second cutting edges, while in each of the sharp at the corners of the rhombus, the first edge is connected to the second edge along an angular radius cutting edge, at least one protrusion is made on the front surface adjacent to the second edge, the apex of which is located at shown lateral surface and offset along the base of the protrusion on the second cutting edge relative to its middle in the direction of the obtuse corner of the rhombus.

The proposed cutting insert is presented in figures 1-5, where

figure 1 shows a perspective view of a cutting insert mounted in the socket of the cutter body (not shown);

figure 2 shows a right view of the cutting insert shown in figure 1, provided that the supporting surface of the end side of the insert is aligned with the plane of the drawing;

figure 3 shows a top view of the cutting insert shown in figure 1, provided that the supporting surface of the front side of the insert is aligned with the plane of the drawing;

figure 4 partially shows a section of the cutting insert in figure 1 along the line aa;

figure 5 on an enlarged scale shows the plot I in figure 1.

The cutting insert is made in the form of a rhombus and is indexable and double-sided, i.e. has four straight cutting edges (two first 6 and two second 7) on each end side 1, 2. Each end side includes a supporting surface 3 and a front surface 4 extending along the cutting edges. The cutting insert is also limited by the side surface 5, at the intersection of which with the end surfaces are cutting edges.

Each end side has two cutting angles (sharp angles of a rhombus) formed by a feather cutting edge 6, a second cutting edge 7 and a corner radius radius connecting them 8. The first cutting lump 6 is designed to process ledges on the workpiece and its projection onto the main plane of the cutter (see Fig. 1) is parallel to the axis of the cutter 9. In this case, the first cutting edge 6 is the main cutting edge, and the second cutting edge 7 is auxiliary. The second cutting lump 7 is intended for processing with the feed direction S (see FIG. 1) inclined to a plane perpendicular to the axis of the cutter 9. In this case, the second cutting edge 7 is the main cutting edge, and the first cutting edge 6 is auxiliary.

To increase the cutting forces pressing the cutting insert to the supporting surfaces of the housing socket (interacting with the side surface 5 of the cutting insert), a protrusion 10 is made on the front surface adjacent to the second cutting edge, the apex “c” (see FIG. 5) of which is located on the side surface 5 and is offset along the base of the protrusion "ab" on the second cutting edge 7 relative to its middle "d" in the direction of the obtuse corner of the rhombus. The number of protrusions 10 on the second cutting edge depends on its length and is equal to one or more. The cutting force component on the edge “cb” of the protrusion 10 presses the cutting insert into an angle between the side supporting surfaces of the cutter body socket, thereby increasing the reliability of fixing the cutting insert during operations with an inclined feed direction.

Claims (1)

An indexable double-sided diamond-shaped cutting insert bounded by two end faces and a side surface and having a supporting surface and a front surface on each end face, two first cutting edges and two second cutting edges, the first edge being connected to the second in each of the sharp corners of the rhombus edge along the radius of the radius of the cutting edge, characterized in that on the front surface adjacent to the second edge, at least one protrusion is made, the apex of which is located on the specified lateral surface and offset along the base of the protrusion on the second cutting edge relative to its middle in the direction of the obtuse corner of the rhombus.

Images