Boots – shoes – and leggings
Patent
1985-01-07
1988-01-19
Smith, Jerry
Boots, shoes, and leggings
364184, 318563, G05B 1900
Patent
active
047207965
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a tool interference checking method and, more particularly, to a tool interference checking method for checking beforehand whether a tool will interfere with a workpiece when the tool is transported relative to the workpiece while offset by the tool diameter to cut the workpiece on the basis of created NC data.
BACKGROUND ART
A numerical control device (referred to as an NC device) moves a tool relative to a workpiece on the basis of previously created NC data to subject the workpiece to numerically controlled machining as commanded. In such numerical control, the trajectory of the tool center does not coincide with the desired machined profile, that is, with the path specified by the NC data, but rather is a path offset, by an amount equivalent to the tool diameter, from the machined profile to the right or left side thereof with respect to the travelling direction. Such a tool center trajectory is calculated automatically by the NC device if the machined profile and tool diameter, as well as a G-instruction for executing the tool diameter offset, are given. The tool is transported along the obtained path of the tool center to finish the workpiece into the desired machined profile. It should be noted that there are also cases where NC data indicative of the path of the tool center (which data are referred to as offset NC data) are created from the abovementioned NC data and tool diameter, and the tool is moved in accordance with the offset NC data to subject the workpiece to the desired machining.
There are situations where, depending upon the machined profile (part profile) and tool diameter, a tool with interfere with the workpiece when the tool is transported along the tool center path obtained by the offset, thereby resulting in damage to the tool or in excessive cutting which makes it impossible to obtain a part having the commanded profile.
It is therefore necessary to check beforehand whether the tool will interfere with the workpiece when cutting is performed while the tool is being offset in accordance with created NC data.
However, a method of checking for tool interference in a simple manner does not exist in the prior art.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a tool interference checking method through which it can be checked, in simple fashion, whether a tool will interfere with a workpiece in a case where the tool is being transported relative to the workpiece to cut the workpiece while being offset by the tool diameter in accordance with created NC data.
Another object of the invention is to provide a method through which NC data can be corrected in a case where tool interference could occur.
The present invention provides a tool interference checking method for checking beforehand whether a tool will interfere with a workpiece when the tool is transported relative to the workpiece while being offset by the tool diameter to cut the workpiece on the basis of created NC data. The tool interference checking method includes checking whether a travelling direction designated by NC data agrees with a travelling direction obtained by a tool diameter offset, and deciding that the tool will interfere with the workpiece when non-agreement is found. Further, in a case where tool interference would occur, the method includes obtaining a closed path, which includes an element in which travelling direction heads backward, from a path obtained by the tool diameter offset, and correcting the NC data in such a manner that the closed path is eliminated .
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1(A)-1(C) are views for describing the present invention in general terms;
FIGS. 2(A) and 2(B) are views for describing a method of creating a tool offset path;
FIG. 3 is a block diagram of an automatic programming apparatus for practicing a tool interference checking method according to the present invention;
FIGS. 4(A) and 4(B) are flowcharts of tool interference checking processing;
FIGS. 5(A) and 5(B) are tables for describing
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patent: 4162527 (1979-07-01), Kilbane et al.
patent: 4445182 (1984-04-01), Morita et al.
patent: 4482968 (1984-11-01), Inaba et al.
patent: 4489377 (1984-12-01), Mawyer
patent: 4513366 (1985-04-01), Munekata et al.
patent: 4549270 (1985-10-01), Fukumura et al.
Kishi Hajimu
Seki Masaki
Takegahara Takashi
Fanuc Ltd.
Lastova John R.
Smith Jerry
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