Cutting by use of rotating axially moving tool – Tool-support with means to move tool relative to tool-support – To move radially
Patent
1993-02-24
1994-07-12
Bishop, Steven C.
Cutting by use of rotating axially moving tool
Tool-support with means to move tool relative to tool-support
To move radially
407 37, 407 87, 408185, B23C 524
Patent
active
053283074
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on a cutting tool for working interior and exterior contours of workpieces, with the tool including at least one cutting plate exchangeably fastened to a basic tool body and being adjustable radially to the tool axis by means of at least one adjustment screw while being clampable by clamping means to a supporting shoulder of the basic tool body that absorbs the working pressure. In a prior art cutting tool of this type (German Patent 3,201,508), a separate screw element is provided to adjust the cutting plate and to clamp it tightly into the supporting shoulder of the basic tool body. The cutting plate is disposed at a clamping shoe which is supported in the basic tool body so as to be rotatable about an axis that is axially and radially offset relative to the cutting plate. The radial adjustment of the cutting plate relative to the tool axis is effected by rotating the clamping shoe relative to the basic tool body, with this inevitably also changing the angular position of the cutting plate relative to the tool axis. To clamp the cutting plate or cutting edge to the supporting shoulder of the basic tool body, the clamping shoe is pulled at a right angle against the supporting shoulder, whereupon the cutting plate is held at the basic tool body by a friction lock. This configuration requires a relatively large amount of space and is therefore unsuitable for tools with which very small bores are to be worked. Moreover, the prior art arrangement is also unsuitable for high-speed work because the cutting plate is not held in a form lock at the basic tool body to prevent it from radially escaping from the revolving tool.
SUMMARY OF THE INVENTION
The arrangement according to the invention concerns a cutting tool of the type discussed above where the radial adjustment of the cutting plate with respect to the tool axis, together with the clamping of the cutting plate to a supporting shoulder of the basic tool body, are simultaneously effected by means of at least one adjustment screw. The invention is thus distinguished by a particularly compact configuration in which, in principle, only one adjustment screw is required for adjustments and only one clamping nut for clamping in the cutting plate, and which therefore opens up the possibility of miniaturizing the tool and using it for precision working of small diameter bores.
Various advantageous modifications of the basic arrangement according to the invention likewise are disclosed.
A form locking fastening of the cutting plate to the basic tool body can be realized according to an advantageous embodiment of the invention if the tool is constructed with the following features: (a) the adjustment screw is disposed at an acute angle relative to the supporting shoulder of the basic tool body and engages in a clamping nut which is rotatably mounted on the basic tool body but is axially supported in one direction; (b) the adjustment screw is provided with an axial clamping shoulder facing the angle vertex and urged against an axial counter-shoulder facing the opening of the angle on the cutting plate in contact with the supporting shoulder; and (c) the adjustment screw is provided with a longitudinal section that is arranged eccentric to the screw axis while its eccentric circumferential face forms a radial clamping shoulder which presses against a radial counter-shoulder extending parallel to the screw axis on the cutting plate lying against the supporting shoulder. A tool of such a configuration is suitable for high-speed work because the centrifugal force acting on the cutting edge when the tool is revolving acts against the axial clamping shoulder of the adjustment screw so that the form lock is reliably retained. The cutting plate can be given such a configuration that the centrifugal force vector acting on its center of gravity goes through the region of the supporting shoulder of the basic tool body. There further results the advantage that after release of the clamping nut, the cutting plate flips out of t
REFERENCES:
patent: 3286557 (1966-11-01), Rietzler et al.
patent: 4497601 (1985-02-01), Negus
Fees Heiner
Goetz Manfred
Bishop Steven C.
Mapal Fabrik fur Prazisionswerkzeuge Dr. Kress KG
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