Metal working – Plural diverse manufacturing apparatus including means for... – With turret mechanism
Patent
1996-12-06
1998-08-04
Briggs, William R.
Metal working
Plural diverse manufacturing apparatus including means for...
With turret mechanism
29 27C, 82129, 82159, B23R 2300, B23B 2924
Patent
active
057875600
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a numerically controlled lathe according to the preamble of claim 1.
BACKGROUND ART
In the case of a known lathe of this kind (JP-A 1-183301) the counter spindle can be moved in the X direction by means of a hydraulic drive. This moveability of the counter spindle in the X direction by means of a special drive is necessary, since in the known solution a cutting off operation can be performed only with a cutting off tool, which sits on the tool turret, which sits on the same slide as the counter spindle. The positioning of the counter spindle by means of the hydraulic drive results in a decrease in accuracy. The existing second tool holder is mounted stationarily. With the known machine simultaneous machining at main and counter spindle is not possible.
Furthermore, there exists a lathe (JA-A 6-703), which exhibits a counter spindle, mounted on a compound slide rest, and two indexing tool holders, which can be moved in the X direction. One of the tool holders exhibits two groups of tools, one of which is designed for machining works at the main spindle and the other for machining works at the counter spindle. With this machine a simultaneous machining of works at the main and counter spindle is possible, but there must exist two cross slide rests, which can be moved in the X direction, for the tools and a compound slide rest for the counter spindle. Therefore, the machine is comparatively complicated.
THE INVENTION
Starting from the aforementioned prior art, the invention is based on the problem of designing such a lathe in such a manner that it can machine the works at the work spindle and counter spindle, while simultaneously keeping the number of axes of this machine at a minimum.
The solution to this problem is disclosed with the features of the characterizing part of claim 1.
The machine, according to the invention, permits simultaneous machining despite its comparatively simple construction. Moreover, owing to its construction the accuracy of this machine is higher than for a lathe, whose counter spindle can be moved with respect to the tool turret. In the solution according to the invention the mounting of the counter spindle is significantly more reinforced.
Preferred embodiments of the invention are described in the dependent claims.
In a first preferred embodiment the lathe is designed for simultaneous machining of the works, clamped at the work spindle and the counter spindle, with tools, whose spatial relationship to each other remains unchanged during the machining operation in the X direction or in the Z direction. Such a rigid arrangement during the machining operation leads to high machining speeds with high machining accuracy.
In this respect it has been proven to be expedient for the second slide with the second tool holder to be moveable also in the direction of the work spindle axis and for the numerical controller to process the traverse information of the first slide, supporting the counter spindle, in such a manner with the traverse commands for the second slide that while the tools of the tool turret are machining the work, clamped into the work spindle, the tools of the second slide, which machine the work clamped into the counter spindle, can follow.
Generally the slide traversing paths are computed starting from a fixed reference point on the machine. The reference point for the counter spindle is variable as a function of the movement of the first slide, so that the feed distances of the second slide have to be computed and controlled from the momentary position of the reference point, the compensation position.
Other preferred embodiments of the invention follow from the other dependent claims.
BRIEF DESCRIPTION OF THE FIGURES
A preferred embodiment of the invention is described below in detail with the aid of the drawing. The drawing is a diagrammatic top view of an embodiment with a sectional view of some components.
BEST METHOD FOR IMPLEMENTING THE INVENTION
In a stationary headstock 1 is mounted a work spindle 1b, which h
REFERENCES:
patent: 3990133 (1976-11-01), Schalles
patent: 4452109 (1984-06-01), Ballach et al.
patent: 4457193 (1984-07-01), Matthey
patent: 4612832 (1986-09-01), Ushigoe et al.
patent: 5163009 (1992-11-01), Yamale
patent: 5210917 (1993-05-01), Piguet et al.
Briggs William R.
Gildemeister AG
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