A Five-axis CNC Machining Method For The Impeller And Research On The UG Secondary Development

High quality manufacturing of impeller is an important research object in the modern industrial technology, which mainly relates to some theoretical knowledge and practical application, such as mechanical design, process planning, collision interference, quality analysis testing and simulation processing.Because of the special application of the impeller, such as aviation aircraft, carrier rocket and other key parts, the production and processing technology of the impeller has become a hot research topic.The impeller is recognized as the difficult and urgency machining parts, it is widely used and demand, the material of impeller is hard, complex type surface is distorted, and leaf coincidence degree is higher, which causes a lot of problems in the machining practice:1. Runner blade’s type is a free surface, and it is designed very complex.2. Occurrence of interference and collision seriously affect the machined surface quality and tool life.3. The mechanism of cutting tool path planning has no standards to guide about the sound and optimal trajectory;4. Surface quality of precision is very low, and it is difficult to realize high speed and high precision requirements.In view of the above problems,and with the support of provincial science and technology,the writer of the paperresearch and explore in the aspects of modeling, technics, and the UG secondary development etc,based on the integral impeller as an example,and application of numerical control processing theory and technology, the paper mainly completed the following work:1. Establishment of impeller model. Application of UG software system of knowledge, the key of the completion of complex surface profile impeller solid modeling is NURBS (Non-Uniform Rational B-Spline) modeling theory and Application, through using sketch map and characteristic in UG software knowledge system.2. Summary of the impeller machining methods and processes.This paper analysis of the processing technology, processing methods and parameters selection, with integral impeller as an example.3. Runner blades are divided into block. Application of affinity propagation clustering algorithm based on the principal curvature, the blade is divided into several surface clusters, then use C-Map model method to extract the boundary, generating and processing sub region.4. Selecting the circular knife.Progarmming and calculate the toolpath based on the iso-scallop method. The optimization process of tool path is avoiding processing on the premise of the interference in the process of collision.5.UG secondary development.It uses UG platform with secondary development tool OPEN/API function and UG programming interface and the library function under the VC++6.0environment, which will developthe verify system.It achieves good tool planning through the experimental results.