Patent
1993-12-02
1995-11-14
Nguyen, Phu K.
G06F 1560
Patent
active
054674450
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cross sectional configuration creating apparatus in the creation of a free curve, and more specifically, to a cross sectional configuration creating apparatus in the creation of a free curve for creating a cross sectional configuration for creating a free curve by a CAD/CAM system.
2. Description of the Related Art
This application was filed on PCT international application No. PCT/JP93/00449 on Apr. 7, 1993.
A free curve of a metal mold and the like is composed of a basic curve (BC) as an arbitrary curve and a drive curve (DC) in a spatial coordinate system. More specifically, the free curve is created by moving the drive curve along the basic curve in accordance with a predetermined rule. Therefore, when the free curve is created, the drive curve must be defined with respect to the passing-through points of the basic curve. The drive curve is referred to as a "cross sectional configuration" and usually defined on a plane coordinated system.
FIG. 14 is a diagram showing the relationship between the basic curve and the drive curve, wherein a basic curve BC is defined on a spatial coordinate system (X, Y, Z). A cross sectional configuration DC141 is defined at the passing-through point P141 of the basic curve BC as the drive curve. In the same way, a cross sectional configuration DC142 is defined at a passing-through point P142. These cross sectional configurations DC141, DC142 are curves defined on respective plane coordinate systems 141, 142 each having a V axis as the ordinate and an H axis as the abscissa.
Conventionally, there are known four methods of defining a cross sectional configuration with respect to a basic curve, i.e., a "parallel method", "radiation method", "normal method" and "vertical method" which will be described below.
FIGS. 15(a)-15(d) are diagrams of methods of defining a cross sectional configuration with respect to a basic curve.
First, a method of defining the cross sectional configuration by the "parallel method" will be described by using FIG. 15(a). A cross sectional configuration DC151 is predefined. Then, an operator designates the angles, passing-through points and the like of defined plane coordinate systems in a spatial coordinate system. With this arrangement, plane coordinate systems 151a, 152a, 153a are positioned at the angles designated at the passing-through points on a basic curve BC151. Therefore, a free curve is created from the basic curve BC151 and the cross sectional configuration DC151 on the plane coordinate systems 151a, 152a, 153a.
Further, a method of defining the cross sectional configuration by the "radiation method" will be described by using FIG. 15(b). A cross sectional configuration DC152 is predefined. In addition, a point P152 is designated which serves as the center in a spatial coordinate system. The point P152 is positioned on the radiation having the ordinate (V axis) as a central axis so that the point P152 acts as the origin of, for example, plane coordinate systems 151b, 152b, 153b. A free curve is created from the cross sectional configuration DC152 of the thus positioned plane coordinate systems 151b, 152b, 153b and a basic curve BC152.
Further, a method of defining the cross sectional configuration by the "normal method" will be described by using FIG. 15(c). A cross sectional configuration DC153 is predefined. Next, passing-through points on the basic curve BC153 in a spatial coordinate system are designated. Plane coordinate systems 151c, 152c, 153c are positioned so that the tangential vectors of the basic curve BC153 at the passing-through points become normal vectors. A free curve is created from the cross sectional configuration DC153 of the thus positioned plane coordinate systems 151c, 152c, 153c and the basic curve BC153.
Then, a method of defining the cross sectional configuration by the "vertical method" will be described by using FIG. 15(d). A cross sectional configuration DC154 is predefined. Further, a basic curve BC154a is defined on
REFERENCES:
patent: 5065348 (1991-11-01), Kuragano et al.
Hanaoka Osamu
Seki Masaki
Fanuc Ltd.
Nguyen Phu K.
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