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由于寄存器位数的限制,数控装置所能插补的圆弧半径有一最大值γ_m,例如复旦——长风型数控线切割机的γ_(max)=2~(18)-1=262143μm=262.143mm,但生产上半径大于γ_(max)的圆弧却屡见不鲜。不仅大电机的冲片模上有许多大圆弧,风机叶片之类的小零件上也有大圓弧。在非圓曲线的曲率半径很大处,其拟合圆弧的半径也会超过γ_(max)。本文介绍一种处理大圓弧的方法——用一系列半径等于γ_m(γ_m为γ_(max)基础上适当考虑
Due to the limitation of the number of register bits, the radius of circular arc that the CNC device can interpolate has a maximum value of γ_m, for example, γ max = 2 ~ (18) -1 = 262143μm = 262.143 of Fudan-Changfeng NC WEDM mm, but it is not uncommon to produce a circular arc with a radius greater than γ_ (max). Not only large motor punch die has many large arcs, fan blades and the like on the small parts also have a large arc. If the radius of curvature of the non-circular curve is very large, the radius of the fitted arc will also exceed γ max. This article describes a method of dealing with large arcs - with a series of radii equal to γ_m (γ_m for γ_ (max) based on appropriate consideration