Cutters – for shaping – Rotary cutting tool – Including holder having seat for inserted tool
Patent
1996-09-24
1998-12-15
Pitts, Andrea L.
Cutters, for shaping
Rotary cutting tool
Including holder having seat for inserted tool
407 46, 407 53, 409232, B23C 520
Patent
active
058488588
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention.
The invention relates to a milling cutter having a base body that can be driven in a rotating manner around its longitudinal axis and support bodies that are distributed over the surface of the base body. The support bodies support cutting plates made of a hard cutting material. The support bodies are supported against centrifugal forces by a base body stopper which the support bodies are tensioned against.
2. Background Information.
In a prior art milling cutter disclosed in DE 40 03 862 A1 of the type mentioned at the beginning, the support bodies equipped with cutting plates lie individually in recesses made from the end face of the base body basically parallel to its longitudinal axis or to the axis of rotation of the milling cutter. In each recess, the support bodies are tensioned radially outwards against the wall of the recess by means of clamping devices that can be activated by the end face of the base body. This ensures a secure support against the centrifugal forces being exerted on the support bodies during operation. The recesses for the insertion of the support bodies must be bored or cut individually. This makes the milling cutter very complicated and costly to manufacture. Furthermore, the recesses for the insertion of the individual clamping devices must be widened on one side. This is because the clamping devices used here are clamping wedges, and the further steps for their arrangement require more complicated production steps.
OBJECT OF THE INVENTION
The object of the invention is to create a milling cutter of the type mentioned at the beginning having radial support for the support bodies against the centrifugal forces exerted, which milling cutter is easy to manufacture without compromising on its functioning. This objective is attained by providing a recessed central area surrounded by a raised peripheral area on an end face of the base body, with the recessed central area and the raised peripheral area together forming a step acting as the base body stopper. The support bodies are provided with a counter-step which interlocks with the base body step and is tensioned against the end face of the base body. A mounting plate is disposed at the end face of the base body and is provided with grooves. The grooves of the mounting plate open substantially radially outward and substantially interlock with the support bodies on the sides and rear.
SUMMARY OF THE INVENTION
The solution in accordance with the invention enables the central area, the peripheral area and the step formed between them to be easily completed in a single tensioning procedure. The same applies for the mounting plate, and the support bodies are also easy to manufacture. The milling cutter is therefore characterized by a particularly high degree of axial and concentric accuracy, due to the fact that the support body beddings are manufactured in the same tensioning procedure and therefore in one cut, so to speak. This procedure produces both the base as well as the bearing surfaces for all support bodies, i.e. for the cutting plates.
Due to their radial direction, the grooves of the mounting plate can be made precisely, with few notches in the stress direction, and relatively inexpensively by means of e.g. wire EDM.
Manufacture is made even simpler by making the peripheral area and the central area of the end face of the base body to be substantially parallel to each other and each substantially parallel to a longitudinal axis of the base body.
By having the step between the stepped surface forming the central area and the peripheral area form the surface area of a cylinder or a truncated cone with the axis of the base body forming the axis of the cone or cylinder, however, the basic design of peripheral area, central area and the step of the base body as well as of the opposite area of the mounting plate can be machined by rotation. Surface and cylindrical grinding of the surfaces of the base body and the mounting plate is then possible in a simple manner, whic
REFERENCES:
patent: 3091138 (1963-05-01), Berry, Jr.
patent: 3104453 (1963-09-01), Greenleaf
patent: 4522538 (1985-06-01), Lindsay
patent: 5662436 (1997-09-01), Bishop
patent: 5667343 (1997-09-01), Hessman et al.
Jager Horst
Muller Gebhard
Kennametal Hertel AG
Pitts Andrea L.
Prizzi John J.
Tsai Henry W. H.
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