Boots – shoes – and leggings
Patent
1988-01-29
1990-10-23
Ruggiero, Joseph
Boots, shoes, and leggings
364191, 36447423, 3644743, 3185681, 82118, G05B 19403
Patent
active
049657372
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a numerical control apparatus for an NC machine tool which performs C-axis machining.
A numerical control apparatus ordinarily is adapted to execute numerical control processing based on NC program data, and to control an NC machine tool such as a lathe in accordance with the results of processing to subject a workpiece to machining specified by a command. Recent numerical control apparatus come equipped with subprogram and custom macro functions through which various complicated machining control programs and repetitive control programs can be prepared in a simple manner.
The aforementioned custom macro is utilized in order to comply with a user request that the NC machine tool be provided with the function of a lead processing machine in a case where C-axis machining is to be performed. However, this makes it necessary that the machining command data be supplied to each axis at a rate greater than the conventional distribution frequency. In other words, a lead machining function refers to a machining function in which, in an NC machine tool having a mechanical construction of the kind shown in FIG. 7, a tool t on a Z axis parallel to the rotational axis C of a workpiece w is moved at high speed along the Y axis by a move command independent of the Z axis to subject the workpiece w to milling. Such a lead machining function is essential in the machining of e.g. the head of a video deck, which requires that the workpiece w be rotated and that the movement of the tool be controlled in such a manner that the amount of machining differs every rotational angle during one revolution of the workpiece. In a machine tool for practicing this lead machining, it is also necessary to deal not only with lead machining but also with ordinary milling by the tool t in accordance with the drive axes X, Z of the tool t. With the conventional numerical control apparatus, the preparation of the amount of high-speed distribution data necessary for lead machining and the editing of programs cannot be performed in a simple manner, and special-purpose machinery is required for this type of machining.
SUMMARY OF THE INVENTION
The present invention has been devised to solve the aforementioned problems and its object is to provide a numerical control apparatus through which high-speed distribution data for controlling a machine tool having the foregoing mechanical construction can be prepared with facility by a user whenever necessary.
In accordance with the present invention, there is provided a numerical control apparatus for controlling a machine tool having a machining function for moving a tool relative to a workpiece or vice versa along a rotational axis of the workpiece to machine the workpiece to a predetermined shape, comprising data setting means for setting a relation between a rotational angle of the workpiece and a position of the tool relative to the workpiece, processing means for deciding an amount of tool movement and a rotational velocity of the workpiece in accordance with the set data, and drive control means for distributing decided move command data to the machine tool.
Thus, in the numerical control apparatus of the invention, data in an execution format required by a specific machining function such as a lead machining function are prepared based on data set by an operator, and high-speed distribution data for controlling the machine tool are readily prepared by a user whenever necessary by setting parameters similar to those in ordinary milling. Thus, a specific machining function which requires high-speed interpolation is realized.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram illustrating an embodiment of the present invention;
FIG. 2 is a displacement diagram illustrating an example of lead machining;
FIGS. 3(a) and 3(b) illustrate the constitution of an area storing execution format data;
FIGS. 4(a)and 4(b) illustrate the arrangement of a header;
FIG. 5 illustrates the correspondence between variables and the area storing the exec
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Supplementary European Search Report for EP-87-90-4942, The Hague, 2/16/90.
Fanuc Ltd
Ruggiero Joseph
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