Boots – shoes – and leggings
Patent
1991-05-22
1993-08-31
Ruggiero, Joseph
Boots, shoes, and leggings
318571, 318578, 3644743, 36447433, G05B 19407
Patent
active
052414841
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a tracing control method, and more particularly, to a tracing control method by which an overshot machining of a cutter into a workpiece at a region of a model where the shape thereof undergoes an abrupt change is prevented, whereby the overall tracing time can be shortened.
2. Description of the Related Art
In a tracing control, the amounts of displacement of respective axes applied to a stylus are detected by a tracer head, speed commands of the respective axes are calculated in a tracing calculating circuit by using these amounts of displacement, motors of the respective axes are driven in accordance therewith, and the tracer head is moved along the surface of a model while the cutter is moved relatively against a workpiece at the same speed, and by repeating this motion the workpiece is machined to the same shape as the model.
Nevertheless, such a tracing control has a problem in that an overshot machining might occur at regions of the model where the shape is abruptly changed if the tracing speed is too high.
To solve this problem, the applicants filed Japanese Patent Application No. 1-192383 wherein the title of the invention is "TRACING CONTROL METHOD", on Jul. 25, 1990. In this Patent Application No. 1-192383, a region in which an abrupt change of the model surface occurs is detected based on the amounts of displacement of the respective axes obtained by the tracer head, the position in the tracing direction is stored, and the tracing speed is lowered only in a section within the range of predetermined distances in front of and behind the position in the tracing direction stored this time, in the next tracing pass, to prevent an overshot machining and accordingly, to shorten the overall tracing time.
Nevertheless, because the position of an actual abrupt change region in the next tracing pass is not always at the same position as that of the abrupt change region detected in this tracing pass, the range of the deceleration section can not be set to a value small enough to cope with this anomaly, and thus the desired shortening of the tracing time cannot be attained.
SUMMARY OF THE INVENTION
The present invention has been made in view of the aforesaid drawbacks, and an object of the present invention is to provide a tracing control method in which an overshot machining of the cutter into a workpiece at a region of a model where the shape thereof undergoes an abrupt change is prevented, and thus the overall tracing time can be further shortened.
To achieve the above object, in accordance with the present invention there is provided a tracing control method for machining a workpiece through tracing by repeating a plurality of tracing passes in the tracing direction which is constant to a pick feed while detecting amounts of displacement of respective axes applied to a stylus, comprising detecting a first abrupt change region on the above model surface using the amounts of displacement of the respective axes obtained in the previous tracing pass, storing at least a first position in a specific plane on the above first abrupt change region, detecting a second abrupt change region contiguous to the above first abrupt change region on the above model surface using the amounts of displacement of the respective axes obtained in this tracing pass, storing a second position in the above specific plane on the above second abrupt change region, and lowering the tracing speed in the next tracing pass in a section within the range of predetermined distances in front of and behind an intersection of a position in the above specific plane with an extended line passing through the above first position and the above second position.
Assuming that a next abrupt change region exists on the extended line connecting the abrupt change region of the previous tracing pass to the abrupt change region of this tracing pass, the tracing speed is lowered only in the section in the vicinity of this assumed abrupt change region in the next tr
REFERENCES:
patent: 4266172 (1981-05-01), Yamazaki
patent: 4357664 (1982-11-01), Imazeki et al.
patent: 4394608 (1983-07-01), Tryber et al.
patent: 4646225 (1987-02-01), Matsuura
Matsuura Hitoshi
Okamoto Tetsuji
Fanuc Ltd.
Ruggiero Joseph
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