Turning – Radially moving rotating tool inside bore – Tool simultaneously moving axially
Patent
1999-01-05
2000-12-12
Tsai, Henry W. H.
Turning
Radially moving rotating tool inside bore
Tool simultaneously moving axially
82100, 82118, 82158, B23B 326
Patent
active
061583111
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention is concerned with a machine tool, in particular a machine tool suitable for use in machining the surface of a bore by moving a cutting tool around a machining circle.
BACKGROUND OF THE INVENTION
There are many occasions when it is necessary to machine the surface of a bore. Conventionally, where the bore has a constant diameter along its length, a cutting tool is fixedly mounted on a tool carrier and is moved along the bore while the carrier is rotated at a constant angular velocity about a machining axis which is coincident with the longitudinal axis of the bore. The cutting tool, thus, machines around a machining circle of constant diameter. This procedure has the disadvantage that it is not possible to make a fine adjustment of the diameter of the machining circle without remounting the tool on its carrier.
It is conventional, where the bore varies in diameter, ie is profiled, to vary the diameter of the machining circle, as the bore is machined. This is achieved by providing a transverse slideway on the tool carrier and mounting the tool on this slideway. A mechanism extends through the tool carrier, and a tool holder on which the tool carrier is mounted, to a thrust washer or the like which can be moved, eg by a ball screw, to move the tool inwardly or outwardly along the slideway so that the tool moves transversely relative to the tool carrier. This arrangement can also, in principle, be used for making fine adjustments when machining bores of constant diameter. However, not only is this arrangement relatively complex but it also has the disadvantage that the slideway may become clogged with swarf.
SUMMARY AND OBJECT OF THE INVENTION
It is an object of the present invention to provide a machine tool in which the diameter of the machining circle can be varied without re-mounting the cutting tool and without moving it transversely relative to its tool carrier.
The invention provides a machine tool suitable for use in machining the surface of a bore by moving a cutting tool around a machining circle which has an adjustable diameter, the machine tool comprising a support mounted for rotation about a machining axis, and a first motor operable to rotate the support about the machining axis, characterised in that the machine tool also comprises a tool holder mounted on the support for rotation about a tool positioning axis which is parallel to and off-set from the machining axis, the tool holder being adapted to receive a tool carrier on which a cutting tool is mounted, a second motor operable to rotate the tool holder about the tool positioning axis, and control means operable to control the speed of rotation of the first and the second motors according to a predetermined program so that, in order to maintain a constant diameter for the machining circle, the support and the tool holder are rotated about their respective axes at equal angular velocities so that the tool holder and the support rotate as a unit, and, in order to adjust the diameter of the machining circle, one of the motors operates for a period at a different angular velocity to the other motor, thereby altering the position of the tool holder relative to the support about the tool positioning axis and altering the distance of a cutting tool mounted on the tool holder from the machining axis.
In a machine tool according to the invention, the diameter of the machining circle can be adjusted without re-mounting the cutting tool and without moving it relative to the tool holder so that there is no danger of swarf causing clogging. The machine tool is also mechanically relatively simple. It is also relatively simple to change a cutting tool since a replacement tool carrier with a tool mounted thereon can be mounted on the tool holder without the complications associated with mounting a tool on a transverse slideway. Where said off-set is small, eg 0.1 mm, the machine tool can be used for machining bores of nominally constant diameter with the diameter of the machining circle being finely adjusted as m
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Watkins Adrian Howard
Wyatt Colin
Federal-Mogul Technology Limited
Tsai Henry W. H.
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