The case alteration the taper process manner and wire diameter of the top and bottom strange form by the wire cutting electrical discharge machine taper process manner null of top and bottom strange

摘要

PURPOSE: To eliminate interference of a tool in the neighborhood of an internal corner or a concave surface even in case the width of a minute curved surface is made smaller than the radius of a wire by determining the shortages of the tool diameter correcting amount within X-Y plane on the basis of the tapers of two planes. ;CONSTITUTION: The shortages Δr₁ and Δr₂ of the tool diameter correcting amount (r) within the X-Y plane on the basis of the tapers of the plane H₁ and plane H₂ are determined from formulae Δr₁=r/sin(θ₁)-r and Δr₂=r/sin(θ₂)-r. In the attached figure, L₁ represents the straight line tying the dividing point Pm_-1 to Pm while L₂ does the straight line tying the dividing point Pm to Pm₊₁, and also L₁' represents the straight line generated by parallel movement of straight line L₁ for a distance corresponding to the shortage Δr₁ of the tool diameter correcting amount within the plane Hu while L₂' does the straight line produced by parallel movement of straight line L₂ for a distance corresponding to the shortage Δr₂ of the tool diameter correcting amount within the plane Hu. The intersection Pu of the two straight lines L₁' and L₂' is determined, and this is used as the wire correcting position of the dividing point Pu. Therein θ₁ represents the angle formed by the plane H₁, on which the dividing points Pm, Pm₊₁, Pn lie, relative to the X-Y plane, while θ₂ does the angle formed by the plane H₂, on which the dividing points Pm, Pm_-1, Pn lie, relative to the X-Y plane.;COPYRIGHT: (C)1995,JPO