Gear cutting – milling – or planing – Milling – With regulation of operation by templet – card – or other...
Patent
1991-10-25
1993-05-11
Howell, Daniel W.
Gear cutting, milling, or planing
Milling
With regulation of operation by templet, card, or other...
318578, 36447403, 409127, 409132, B23Q 3512
Patent
active
052096181
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of setting a tracing zone in a contour tracing in which a surface of a model is traced by tracing a contour thereof so as to machine a workpiece, and more particularly, to a method of setting a tracing zone in which the tracing zone is set by using a plurality of folded lines.
2. Description of the Related
Tracing machining in which a model is traced so as to machine a workpiece is widely used, as the workpiece can be machined without preparing a machining program of the model. Particularly, contour tracing is useful because a free curved surface, which can not be enciphered, can be easily machined thereby.
Not all of the surfaces of the model are needed for general tracing, only zones which are a part thereof as effective curved surfaces. Therefore, usually a zone for the contour tracing is set for the machining.
Contour tracing zones, however, are usually set by straight lines in parallel to the X-axis or the Y-axis, and thus, unless the contour tracing zone is within a rectangle on the X-Y plane, unnecessary zones are machined by the contour tracing, which results in a prolonged machining time and a reduced life of the tools.
SUMMARY OF THE INVENTION
The present invention has been made in view of the aforesaid drawbacks. Therefore, an object of the present invention is to provide a method of setting a tracing zone in a contour tracing, in which the tracing zone is set by using a plurality of limit lines which are not parallel to the axes.
To achieve the above object, in accordance with the present invention, there is provided a method of setting a tracing zone in a contour tracing in which a surface of a model is traced by a contour tracing to thus machine a workpiece, this method comprising setting a contour tracing zone by using a plurality of limit lines which are not parallel to the axes, carrying out a pick feed when a stylus reaches the limit lines, and machining the workpiece by a contour tracing.
Because a tracing zone in the contour tracing is set by using a plurality of limit lines which are not parallel to the axes, the necessary contour tracing zones can be precisely set, and therefore, unnecessary machining time is eliminated and the life, etc. of tools can be prolonged.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagram explaining the outline of a method of setting a tracing zone according to the present invention;
FIG. 2 is a block diagram showing a constitution of a tracing control system for carrying out the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
An embodiment of the present invention will be hereinafter described with reference to the drawings.
FIG. 1 is a diagram explaining the outline of a method of setting a tracing zone according to the present invention. As shown in FIG. 1, a model 40 has a rectangular bottom surface and an upper surface in the shape of a rectangle smaller than that of the bottom surface. Note, it is assumed that a front surface 40a is to be traced by a contour tracing. To carry out a contour tracing of this surface 40a, when a line in parallel to the Y-axis, for example, a ridge line 41 of the bottom surface, is chosen as a limit line, there is no unnecessary contour tracing of the lower part, but unnecessary zones will be contour-traced in the part above that.
In the present invention, a contour tracing zone is set by a broken line 43 and a broken line 44. The broken line 43 is designated by a point P1 (x1, z1) and a point P3 (x3, z3). Namely, a tracing control system produces the broken line 43 as a first limit line by designating the point P1 and the point P3. Similarly, the broken line 44 is designated by a point P2 (x2, z2) and a point P4 (x4, z4), and the tracing control system produces a second limit line accordingly. Also, a broken line 45 is set by the tracing control system as a third limit line, by designating a coordinate value z1 of the Z-axis, where z2.ltoreq.z1.
A stylus 5 carries out a contour tracing along a line 51, an
REFERENCES:
patent: 4456962 (1984-06-01), Imazeki et al.
patent: 4467432 (1984-08-01), Imazeki et al.
patent: 4472782 (1984-09-01), Suzuki
Matsuura Hitoshi
Okamoto Tetsuji
Fanuc Ltd.
Howell Daniel W.
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