Cutters – for shaping – Rotary cutting tool – Including holder having seat for inserted tool
Patent
1996-07-29
1999-09-14
Howell, Daniel W.
Cutters, for shaping
Rotary cutting tool
Including holder having seat for inserted tool
407113, 407114, B23C 522
Patent
active
059512148
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an indexable insert and to a tool for using this indexable insert, particularly in the form of a milling tool.
BACKGROUND OF THE INVENTION
Indexable inserts having plate-like bodies with planar support surface as a base surface, as well as major cutting areas and minor cutting areas on its side opposite to the support surface, whereby further the flanks of the minor cutting areas receding therefrom are inclined with respect to the support surface, are known from EP 0 502 541 A1. Basically they serve their purpose in a satisfactory manner and as a rule have a sufficient machining efficiency. However it is desirable to further improve the life of the cutting insert, the quality of the machined surfaces produced by the insert as well as the machining efficiency. plate body in the shape of a truncated pyramid, which has four major cutting areas distributed over its periphery and in the corner areas four minor cutting areas. The major cutting areas are inclined with respect to the support surface and the minor cutting areas are located in a plane which is parallel to the support surface. Given its cutting geometry, the production of this indexable insert is complicated and extremely expensive in view of the necessary flanks and the plate body shaped like a truncated pyramid.
OBJECTS OF THE INVENTION
It is therefore an object of the present invention to create an indexable insert which meets the highest demands regarding the tool life and surface quality, as well as machining efficiency.
Further it is an object to provide an indexable insert which is at the same time easy to manufacture and without problems.
SUMMARY OF THE INVENTION
In order to achieve these objects, the invention provides the characteristic features defined in claim 1, which are the cuboid shape of the plate body, four major cutting areas and four minor cutting areas at the four corners, respectively four corner areas of the plate body, wherein the major cutting areas and the minor cutting areas are inclined with respect to the support surface in opposite directions. The flanks of the major cutting areas are arranged at a right angle with respect to the support surface.
With the mentioned features an indexable insert is meets the high requirements of many use applications. At the same time it is possible to produce such an indexable insert in a particularly suitable, and therefore cost-effective, manner.
An extremely advantageous cutting geometry results due to the fact that the major cutting areas and the minor cutting areas are respectively inclined towards each other in opposite directions, as well as towards the support surface. Thereby each tine a minor cutting area is located between two major cutting areas and so on,whereby the cutting edges of neighboring major cutting areas, or respectively of minor cutting areas are arranged so that they ascend or descend in the same direction. Thereby each of the minor cutting areas has an inclined transition from the level of the one neighboring major cutting area to the level of the other neighboring major cutting area.
The cutting edges serving as major cutting areas can be straight or slightly curved, and the same applies also to the minor cutting areas.
The preferred tool for the use of the indexable insert is a milling tool. Here it is particularly advantageous when, at a positive axial angle .lambda..sub.s of the major cutting area and a positive angle .gamma..sub.n of the chip-removal face, the seating of the indexable insert stands at a negative radial angle .sigma. with respect to a radial surface.
BRIEF DESCRIPTION OF THE DRAWING
The above and other objects, features, and advantages will become more readily apparent from the following description, reference being made to the accompanying drawing in which:
FIG. 1 is a perspective view of the indexable insert on a large scale;
FIG. 2 is a side view of the indexable insert, also to a large but to a different scale from that of FIG. 1;
FIG. 3 is a top view of the indexable insert acc
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Rothballer Gerhard
Stallwitz Erwin
Storch Helmut
Dubno Herbert
Howell Daniel W.
Widia GmbH
Williams Mark
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