1994-08-22
1996-09-17
Rachuba, M.
Turning
Lathe
Tool rest
407101, B23B 2908
Patent
active
055557848
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a lathe tool with a preferably cylindrical shaft and a tool head carrying an exchangeable indexable cutting insert and resting with a contact surface on a support surface of the shaft, and with a holding screw connecting the tool head to the shaft, and with the contact surface and the support surface being arranged at an acute angle with respect to the axis of the shaft and having engaging straight tooth systems, with furthermore the holding screw being aligned essentially perpendicularly with respect to the support and contact surfaces, and with the indexable cutting insert being arranged countersunk in an essentially axially parallel flat surface preferably extending through the axis of the shaft and defining a chip chamber.
BACKGROUND OF THE INVENTION
It is known to provide lathe tools with a separating point in order to be able to attach different tool heads to a holder. It is furthermore known to connect the tool heads at the separating point of interface by means of screws, with several screws distributed around the periphery being provided for this purpose, which screws when being tightened produce the force locking. Additional forming elements, as for example pins, are commonly used for the form locking.
Furthermore, it is actually known in a tool for drilling and spotfacing to connect a tool head to a shaft through a straight tooth system (DE-30 26 513 C2). The parallel teeth of the straight tooth system extend there parallel to the direction of slope of the support and contact surfaces and transversely with respect to a plane containing the indexable cutting insert. The teeth are arranged such that through a longitudinal adjustment along the teeth a diameter change of the cutting edge is obtained. The screws extend for this purpose on the one side through slotted holes elongated parallel with respect to the teeth, which slotted holes define the range of adjustment. Furthermore, an eccentric screw is provided as the adjusting element.
SUMMARY OF THE INVENTION
The basic purpose of the invention is to provide a separating point for a lathe tool which makes it possible to combine different base members and tool heads with one another and which both in a static and also dynamic aspect guarantees a sufficiently rigid connection and yet enables a simple and quick exchange of the tool head.
To attain this purpose, the invention suggests that parallel teeth of the straight tooth system extend transversely with respect to the direction of slope of the support and contact surfaces and essentially parallel to the plane containing the indexable cutting insert, and that the holding screw has a fitted shaft, with which it extends into a fitted hole essentially perpendicularly extending through the tool head and the shaft in the area of the contact and support surfaces. The inventive design of the separating point has the advantage that the teeth of the straight tooth system extend parallel to the feeding direction of the cutting edge or the entire tool and thus transversely with respect to the main-cut direction of force.
According to a preferred embodiment of the invention, the axially parallel surface containing the indexable cutting insert transfers at its end closest to the shaft into a surface essentially parallel to the contact surface, with a perpendicular depression for the head of the holding screw being arranged in the area of said surface, which depression in turn transfers into the fitted hole for the holding screw.
The slope of the separating point or interface and the toothing angle are advantageously adjusted to one another and combined with one another such that one of the two tooth flanks of the straight tooth systems is aligned essentially parallel to the axially parallel surface containing the indexable cutting insert. In order to achieve this, the tooth flanks of the straight tooth system define an angle of 50.degree. to 70.degree., preferably 60.degree., whereas the normal of the support surfaces defines an angle .alpha. of 15.degree. t
REFERENCES:
patent: 4606680 (1986-08-01), Striegl
patent: 4655655 (1987-04-01), Schurfeld
Muendlein Werner
Scheer Gerhard
Hansen Kenneth J.
Komet Praezisionswerkzeuge Robert Breuning GmbH
Rachuba M.
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