| 摘要 |
PURPOSE:To prevent generation of dullness in a corner part, by drawing a perpendicular from a crossing point of cutting lines in the inside of a corner to a machining route and decelerating feed speed of a wire electrode about a crossing point of said perpendicular and machining route as the center. CONSTITUTION:When a work W and wire electrode P are moved along a corner route as shown by a chain line in the drawing, a corner point A, the foot C of a perpendicular, drawn from an intersecting point of cutting lines in the inside of a corner to a machining route, the middle point B between the points A and C, and a point D, with a distance to the point C equal to a distance from the point B to the point C, are calcutated and stored. At the point A where machining is transferred from a linear part to a corner part, machining voltage rises, and tension of the wire electrode P is increased to suppress oscillating amplitude of the wire electrode P. If the wire electrode P reaches the point B, a feed speed is decreased to about 0.7 times the feed speed Fo in the linear part, if the wire electrode reaches the middle point between the points B and C, the speed is decreased to about 0.5 times, if further reaches the middle point between the points C and D, the speed is increased to about 0.7 times, and if reaches the point D, the wire electrode is controlled to move at the initial speed Fo. |
