Metal working – Plural diverse manufacturing apparatus including means for... – Separate tool stations for selective or successive operation...
Patent
1993-08-27
1995-01-10
Briggs, William
Metal working
Plural diverse manufacturing apparatus including means for...
Separate tool stations for selective or successive operation...
83277, 408 70, 409163, B23Q 700, B21D 4310, B23B 4718
Patent
active
053795105
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a machine for processing of workpieces, comprising a worktable for the support of a workpiece, one or more tool assemblies for processing of the workpiece, and feeding and guiding means arranged to provide for positioning and simultaneous relative movement between the tool assemblies and the workpiece in a longitudinal as well as a transverse direction of the workpiece.
The invention especially deals with drilling and milling machines, and more particularly such machines of the so-called computerized numerically controlled type (CNC machines). Such machines are used within the industry especially for processing of workpieces of wood, and are provided with one or more tool spindles for contour or edge shape milling, for drilling or milling for fittings, for groove milling, etc.
There are previously known different types of CNC milling machines which all have in common that they are provided with a stationary worktable having removable vacuum cups or vacuum fastenings for the workpiece, and further are provided with a longitudinally and a transversely extending sliding guide for relative movement between the tool assemblies and the workpiece in a longitudinal direction (along an X axis) and a transverse direction (along a Y axis) of the workpiece.
The known machines are of two principal types: in one type, the longitudinally extending sliding guide moves the worktable on which the workpiece is fixed or clamped. In the other type, the longitudinally extending sliding guide moves the transversely extending sliding Guide in the X-axis direction along the workpiece, this being stationarily fixed in relation to the machine frame. In both machine types one is precluded from placing an underlying sliding guide with tool spindles below the workpiece, so that this, in these types of machines, cannot be processes from all six sides.
As mentioned above, the workpieces in the known machines during the processing are fixed to stationary worktables by means vacuum cups or vacuum fastenings. This is a substantial obstacle to being able to utilize such a machine in a rational way. The placing of the vacuum fastenings in relation to the workpieces is time-consuming, and one always must try to place these as close as possible to the processing site--the edge of the workpiece--in order to obtain a sufficient clamping. At the same time it has to be ensured that no fastenings are in the way of the milling tool.
When there is one or a small number of workpieces of the same size which is to be processed, this placing of vacuum fastenings will take a disproportionately long time of the total working time for each workpiece.
It should also be mentioned that the length of the workpieces is limited in relation to the machine length or the length of the worktable.
SUMMARY OF THE INVENTION
On this background the main object of the invention is to provide a CNC drilling and milling machine which will eliminate the above-mentioned deficiencies and drawbacks of the CNC drilling and milling machines which are commercially available today.
A more particular object of the invention is to provide such a machine which is without the time-consuming vacuum cups or corresponding fastening means for securing of the workpiece during the processing.
Another object is to provide a machine giving the possibility of continuous processing of workpieces, and processing of workpieces which are without any length restriction, so that the machine may also be constructed with a length which, in principle, is independent of the length of the workpiece.
A further object is to provide such a machine giving the possibility of simultaneous processing of the workpieces from all six sides, i.e. the upside, the underside and the four edge sides.
The above-mentioned objects are achieved with a machine of the introductorily stated type which, according to the invention, is characterized in that the worktable is in two parts and the tool assemblies are arranged on a guiding means in a transversely extendin
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patent: 4603611 (1986-08-01), Ferguson
patent: 4610582 (1986-09-01), Amos et al.
patent: 4709605 (1987-12-01), Clark
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