Impeller machining tool path global optimization method

Abstract

The invention discloses an impeller machining tool path global optimization method, which comprises the following steps: S1) carrying out discrete triangularization on an impeller model and a tool model; S2) planning a trajectory of contact points between tools and an impeller, and calculating a tool position point trajectory; S3) judging a reachable direction cone of each tool position point by utilizing interference checking; S4) establishing a global optimization objective function of cutter-axis vector, construction a constrained single-source directed graph and converting the optimization solving problem of the objective function into the shortest path finding problem; and S5) solving the objective function by utilizing a shortest path finding algorithm to obtain an optimal tool orientation. The method can quickly calculate the reachable direction cone of each tool and realizes overall fairing of the cutter-axis vector.

Description

technical field [0001] The invention relates to the technical fields of computer-aided manufacturing and numerical control machining, and more specifically, relates to an overall optimization method for tool paths in impeller machining. Background technique [0002] Turbomachinery has a wide range of applications in the fields of aviation, aerospace, energy, transportation, water conservancy, chemical industry and petroleum. Two of the three core components of aero-engines belong to turbomachinery, and the key components of steam and gas turbines are also turbomachinery. The impeller is the core part of turbomachinery, and its quality has a decisive impact on the performance of this type of product. Therefore, the design and manufacture of the impeller directly affects the quality and performance of the impeller. Five-axis CNC machining is an important means of processing complex high-performance parts in the industry. Compared with three-axis machining, the advantage of f...

AI Technical Summary

Problems solved by technology

[0003] However, five-axis CNC machining has the following disadvantages: (1) The increase of two rotational degrees of freedom leads to an increase in the complexity of tool attitude control, which limits its application in actual machining to a certain extent; (2) At the same time, during machining The sharp change of the tool axis vector will also produce cut marks on the surface of the part, or even destroy the surface of the part, seriously affecting the processing quality

This way of thinking also has the problem of computational efficiency. When processing complex parts, the obstacle model is often composed of hundreds of thousands or even hundreds of thousands of polygonal meshes. Calculating the reachable direction cone requires huge computing resources and time. Therefore, the research The focus is on how to quickly calculate the tool's reachable direction cone

Images