Projection algorithm for generating curved surface non-interference five-axis processing locus

Abstract

The invention relates to a projection algorithm for generating curved surface non-interference five-axis processing locus, belongs to the milling processing technology field and aims to guarantee that a final knife contact point is on an original workpiece curved surface, improve processing precision and guarantee relatively good processing surface quality. According to the algorithm, a knife contact point of a cutter projected on a triangular sheet model is selected as an initial point; the shortest distance from the initial point to a workpiece curved surface is calculated, and a corresponding point on the workpiece curved surface is further calculated; a tangent plane on the workpiece curved surface passing the corresponding point is established; the cutter is projected to the tangent plane to acquire projection points on the tangent plane; an adjusting search step algorithm is executed for an oscillation convergence problem; the projection point on the tangent plane satisfying an error is taken as the knife contact point. The algorithm is advantaged in that based on a Newton-Raphson algorithm, a continuous iteration method based on the tangent plane is employed, that the knife contact point is on the original workpiece curved surface is guaranteed, and calculation precision of the cutter contact point is improved.

Description

technical field [0001] The invention belongs to a numerical control milling processing method, in particular to a projection algorithm for generating a non-interfering five-axis processing track on a curved surface. Background technique [0002] Common complex surface parts include aircraft fuselage, propeller blades, mobile phone mold contour surfaces, steam turbine blades, automobile bodies, etc., which are widely used in aviation, aerospace, navigation, molds, energy, transportation and other fields. Compared with three-axis CNC machining, five-axis CNC machining can ensure better surface quality and higher processing efficiency. At present, most complex curved surface parts are processed by five-axis CNC machining. [0003] Projection algorithm is one of the effective methods for planning tool machining trajectory, such as figure 1 As shown, the projection algorithm is divided into two steps: ① Planning the driving trajectory and selecting the driving point; ② Projectin...

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Problems solved by technology

[0011] The projection algorithm in the above invention patent has the following problems: First, the contradiction between the calculation accuracy and calculation efficiency of the knife contact. If the density of the triangular piece is not enough, there will be a certain error between the actual knife contact and the ideal knife contact. The calculation accuracy is low; if the density of the triangles is high, the calculation efficiency will be low due to the large number of triangles

The second is that the tool contact located on the discrete surface makes the generated machining trajectory and the first-order discontinuity in the direction of the tool axis, which affects the machining quality

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