To properly evaluate a tool load by a CAM system.
At a process 1, data of a three-dimensional mold shape mode, data on a tool route along a ridge line, data, such as the outside diameter of a tool, and data on a machining condition, such as quality of a material, containing machining allowance, and a tool feed speed, are inputted. The tool in a three-dimensional shape and a mold shape are brought into a two dimensional model on a reference plane passing through the position of each constituting point of the tool route, crossing an X-Y plane at right angles, and also crossing a tool route, projected on an X-Y plane, at right angles. At a process 2, a cutting area at the periphery of a tool is roughly calculated by using a tool and a two-dimensional model in the shape of a mold. From the roughly calculated cutting area and the input data, it is decided whether or not the tool is brought into an overload. At a process 3, information on a deciding result is added to data of each constitution point where a reference plane to effect decision of the tool route is positioned, and data on a tool route with overload information is outputted.
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IWATA KINJI
TAMURA KENGO
