Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1993-01-04
1994-10-18
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
72 81, B21D 2216
Patent
active
053557050
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a process for controlling the revolving path motions of the spinning roller of a spinning lathe as set forth herein as well as to a spinning lathe suitable for performing the process.
BACKGROUND AND SUMMARY OF INVENTION
A process of the type mentioned in the foregoing can be derived from EP-A-0062685. The conventional process is a path-duplicating (playback) method, according to which, in at least one, usually several, master spinning process or processes executed by an expert in the spinning art, coordinate data characteristic for the thus-traversed positions of the spinning roller determined with the aid of position pickups are stored in an electronic NC or CNC control unit and processed by the latter to output data; by serial call-up of these data, X- and Y-coordinate drive units of the spinning machine can be actuated along the lines of tracing the route of the spinning roller determined in the master spinning process. First of all, the contour of the spinning chuck is scanned and a set of coordinate data characteristic for its contour is fed into the NC or CNC control unit; from these data, a safety curve is determined, for example by interpolation, marking the limit of closest-possible approach of the spinning roller toward the spinning chuck. In the conventional process, the contour of the spinning roller proper is utilized as the safety curve.
In accordance with the conventional process of EP-A-0062685, the stored data include, in addition to the coordinate data, also data characteristic for the operating pressures linked to the respective coordinates; these latter data are utilized in the spinning processes subsequently repeated with great frequency for feeding corresponding pressures into the coordinate drive units--hydraulic cylinders. This is done to avoid drawbacks inherent in known path repetition processes used merely with storage of the path coordinates with exploitation of the latter as the desired data for the path motion control of the spinning roller; such drawbacks are seen in that even minor deviations of the shape of the round blank to be subjected to the spinning machining step from a reference shape can lead to the result that an exact tracing of the stored revolution routes is impossible and thereby spun parts of a very differing quality can be produced. Accordingly, the conventional process operates with a three-dimensional set of route tracing data which itself is accompanied by considerable technical expenditure and--on account of the processing time required--causes additional time requirement for the spinning procedure.
The conventional process furthermore has the disadvantage that considerable errors can occur in the detection of the operating pressures of the coordinate drive cylinders during the master spinning process, as well as in their introduction into the control during the spinning processes performed for manufacturing a relatively large series of maximally identical spun parts; this can manifest itself in clearly recognizable quality differences in the surface characteristic of the thus-produced spun parts. It is true that "scattering" of the quality of the manufactured spun parts due to inaccuracies in pressure detection and metered application during the "learning" of the routes as well as during their control can be kept to a moderately low level by taking care when performing the master spinning process that the operating pressures in total are maintained at a constant value along the lines that the forces acting on the sheet-metal workpiece are kept extensively constant over the various revolutions; however, this poses considerable demands for the spinning expert entrusted with performing the master spinning process since this person, while steering the master spinning process "by hand", must not only monitor the workpiece and the spinning roller but also the pressure indications for the coordinate drive cylinders, which is difficult and taxing and normally requires that a master spinning process must be repe
REFERENCES:
patent: 3496747 (1970-02-01), Delmer et al.
patent: 4565081 (1986-01-01), Massee
patent: 4976126 (1990-12-01), Yamamoto et al.
Hartmann Hans
Schulze Eckehart
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