Geometry and mechanics integrated optimization information processing method of interference-free tool path on complex curved surface

Abstract

The invention relates to a geometry and mechanics integrated optimization information processing method of an interference-free tool path on a complex curved surface. The method comprises the following steps: 1) carrying out discrete process on a ball-end milling cutter to generate a depth element model, wherein the model comprises a discrete cuboid element set including the depth information; 2) carrying out sampling process on a two-dimensional image of a tool and a machine tool environment, judging the interference situation between the tool and the machine tool environment by using the depth information, correcting the position of the tool if the interference exists, judging whether the tool and a workpiece is crossed, if yes, executing a step 3), and if not, continually executing the step 2); 3) analyzing a touch region of the tool and the workpiece by using the depth element model, and calculating an instant cutting force of the ball-end milling cutter; and 4) based on multi-constrained cutting conditions, optimizing the process feeding speed of the complex curved surface by adopting a sequential quadratic programming method. Compared with the prior art, the method provided by the invention has the advantages of being high in computational efficiency, simple in programming and applicable to multi-shaft numerical control processing tool path verification and parameter optimization and the like.

Description

technical field [0001] The invention relates to a computer-aided manufacturing technology, in particular to a method for processing geometrically and mechanically integrated optimization information of complex curved surfaces without interfering tool paths. Background technique [0002] Five-axis CNC machining is composed of two rotational degrees of freedom added to traditional three-axis machining. The biggest advantage is that complex parts can be processed with one clamping, which reduces re-clamping time and improves processing quality. The movement of five-axis CNC machining is complex, and it is difficult to intuitively judge the actual trajectory of the machine tool and the tool. It is very necessary to check the safety of the tool path with CNC machining simulation technology. NC machining simulation is divided into two aspects: geometric simulation and physical simulation. Geometric simulation does not consider the influence of cutting parameters, cutting force an...

AI Technical Summary

Problems solved by technology

The movement of five-axis CNC machining is complex, and it is difficult to intuitively judge the actual trajectory of the machine tool and tool. It is very necessary to check the safety of the tool path with CNC machining simulation technology.

[0005] After searching the literature of the prior art, it was found that there is a method for optimizing the feed rate based on the octree geometric model and the instantaneous cutting force model (K.P.Karun.Octree-based NC simulation for optimization of feedrate in milling using instantaneous force model.International Journal of Advanced Manufacturing Technology. (2010) 46: 465-490), this method uses the geometric simulation system based on octree to predict the milling force and optimize the feed rate, but it is mainly used in three-axis CNC machining and has not been fully utilized Geometry simulation system to analyze tool-to-tool instantaneous contact information to predict milling force

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