| 摘要 |
PURPOSE:To shorten a working program by fixing a work at the time of cutting and keeping a fixed cutting speed of a tool in the tangent direction against the work. CONSTITUTION:A work is fixed and an involute curve to be produced is referred to as L with the center of a basic circle of the curve L defined as an original point O respectively. Then a straight line passing through the point O is defined as an X axis together with a straight line passing through the point O and vertical to the X axis defined as a Y axis, an intersecting point between the X axis and the basic circle as the start point B of a involute, the rotational angle of the involute as theta with a straight line OB defined as an original line, and the tool coordinates as (x) and (y) respectively. A numerical controller performs control in order to satisfy the relation of such an equation that secures a fixed speed v0 at a contact between a tool and the work in the tangent direction. In such a production way, it is not required to approximate the involute curve with a segment, a circular arc, a parabola, etc. As a result, a working program is extremely shortened to reduce the load of a programmer. At the same time, the program producing time is shortened and therefore the production efficiency is improved.
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