Boots – shoes – and leggings
Patent
1984-10-17
1987-11-03
Smith, Jerry
Boots, shoes, and leggings
364171, G05B 19403, B23Q 1500
Patent
active
047046872
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
The subject application is related to copending U.S. patent application having Ser. No. 665,165 filed Oct. 17, 1984.
BACKGROUND OF THE INVENTION
This invention relates to a three-dimensional tool path determination method and, more particularly, to a three-dimensional tool path determination method well-suited for application to an NC data creating apparatus for a machine tool, such as a milling machine, having three or more axes, or to a numerical control device for controlling the machine tool.
In a machine tool such as a milling machine, a tool is made to approach a workpiece from a predetermined position (e.g., a reference point), numerically controlled machining is executed by the tool in accordance with a command upon completion of the approach, and the tool is retracted to a predetermined position (e.g., the reference point) after machining. For this reason, NC data for approach and retraction are always required to precede and follow NC data for transporting the tool while the tool is in contact with the workpiece. There are various tool paths for the approach and retraction of the tool, with the optimum approach path or retraction path being determined in such a manner that the tool will not strike the machine or workpiece during the approach or retraction. These approach paths or retraction paths consist of a plurality of blocks.
Accordingly, in creating NC data for an approach path or NC data for a retraction path, the conventional method includes steps of (1) deciding a tool path comprising a plurality of blocks in such a manner that the tool does not strike the machine or workpiece, (2) deciding the end point of each block and the feedrate up to the end point, and (3) entering these end points and feedrates. Thus, creating the NC data for an approach path and the NC data for a retraction path is a troublesome and time-consuming operation.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a three-dimensional tool path creation method through which the NC data for an approach path or tool retraction path can be created simply and in a short period of time.
Another object of the present invention is to provide a three-dimensional tool path creation method through which the NC data for an approach path or retraction path can be created automatically merely by specifying a prescribed tool path pattern among several tool path patterns, and entering data necessary for determining an unknown portion of the tool path pattern.
Still another object of the present invention is to provide a three-dimensional tool path creation method which does not require entry of the end point of each block constituting a tool path.
A further object of the present invention is to provide a three-dimensional tool path creation method through which an actual tool path can be determined and a tool transported along the tool path merely by specifying a prescribed tool path pattern among several tool path patterns, and entering data necessary for determining an unknown portion of the tool path pattern.
The present invention provides a three-dimensional tool path determination method for automatically determining a tool path by designating a tool path pattern for an approach path or retraction path, entering data specifying an unknown portion (parameter) of the tool path pattern, as well as path end point data, and using the input data and the tool path pattern. According to the present invention, a three-dimensional approach path or tool retraction path can be created simply and in a short period of time.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1(A), 1(B), 2(A), 2(B), 3(A) and 3(B) illustrate approach and retraction tool path patterns;
FIG. 4 is a block diagram of an embodiment of the present invention; applied to an NC data creation apparatus, and
FIGS. 5(A), 5(B) and 5(C) illustrate flowcharts of processing for the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
FIGS. 1 through 3 illustrate approach and retraction tool path
REFERENCES:
patent: 4152765 (1979-05-01), Weber
patent: 4328550 (1982-05-01), Weber
patent: 4490781 (1984-12-01), Kishi et al.
patent: 4503493 (1985-05-01), Burkhardt
patent: 4519026 (1985-05-01), Nozawa
patent: 4562551 (1985-12-01), Inaba
Kishi Hajimu
Seki Masaki
Fanuc Ltd
MacDonald Allen
Smith Jerry
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