Tool changing – Including machine tool or component – Rotary spindle machine tool
Patent
1998-11-04
2000-08-08
Gerrity, Stephen F.
Tool changing
Including machine tool or component
Rotary spindle machine tool
408 46, 408 53, B23Q 3155
Patent
active
060994495
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a machine tool, especially for numerically controlled machining centers, for machining workpieces with work spindles arranged in parallel to one another at a headstock, wherein the distance between the work spindles at right angles to their axes of rotation is adjustable.
BACKGROUND OF THE INVENTION
Twin-spindle machining centers with horizontal spindle position (e.g., Huller Hille, nb-h-twin) or vertical spindle position (e.g., Werner DUOMATIK) with automatic tool changers but fixed spindle position have belonged to the state of the art. These machines differ from single-spindle machines by a further increase in production output while flexibility is preserved at the same time. Two workpieces are usually machined in parallel on these machines, and the workpieces are mounted on a device corresponding to the fixed distance between the spindles. The field of use of these machines is inherently limited due to the fixed distance between the spindles, and the simultaneous machining of a plurality of positions on one workpiece is possible in exceptional cases only. Changing the distance between the spindles on these machines results in high costs.
Another drawback of machines with fixed distance between the spindles is the change in the distance between the spindles, which is always present, is caused by heating and can be controlled to a limited extent only even by prior-art compensation measures, e.g., cooling.
Since the prior-art twin spindles have a common drive, it is also impossible to work with tools with different diameters at the same time, because it is often impossible in this machine design to compensate the inherently different circumferential velocities via adapted spindle speeds.
A machine tool with two work spindles which can be moved separately from one another in the vertical direction, wherein each spindle is fastened to separately driven, vertically movable devices, has been known from U.S. Pat. No. 5,336,025. This design is highly complicated and expensive. This is also true of the design according to JP 62138515 U, in which two work spindles located one on top of another can be moved independently from one another in the vertical direction via separately, vertically arranged spindles.
Furthermore, the supplying with tools of these twin spindles with, e.g., two tool magazines with horizontal arrangement of the spindles or chain magazines with two to four tool grippers in one transfer arm with vertical arrangement of the twin spindles is associated with considerable costs.
SUMMARY AND OBJECTS OF THE INVENTION
The primary object of the present invention is to propose a machine tool of this class, which is suitable for the parallel machining of e.g., holes on one or more workpieces, which also have different diameters, and which make possible a simple, simultaneous tool change in all work spindles.
According to the invention a machine tool is provided which is especially for numerically controlled machining centers, for machining workpieces with work spindles arranged in parallel to one another at a headstock. The distance between the work spindles at right angles to their axes of rotation is adjustable. A work spindle is mounted rigidly in the housing of the headstock and at least one second work spindle is fastened in a carriage. The carriage surrounds the stationary work spindle in a U-shaped pattern and has guide beads at the open legs. The guide beads are mounted displaceably in guide elements rigidly connected to the housing of the headstock.
At least one bracket may be provided connected to an adjusting device. The bracket may be fastened on the side to the guide beads and/or the carriage.
According to another aspect of the invention, a machine tool is provided which is especially for numerically controlled machining centers for machining workpieces. The machine tool has two work spindles arranged in parallel to one another at a headstock with axial distance between the axes. A magazine disk with a central axis of rotation parallel t
REFERENCES:
patent: 2757560 (1956-08-01), Ridgway
patent: 4730373 (1988-03-01), Senoh
patent: 5336025 (1994-08-01), Ozawa et al.
patent: 5343604 (1994-09-01), Takagi
Gerrity Stephen F.
Huller Hille GmbH
Wilson Adrian M.
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