Study On Key Technologies Of Rapid Design & Manufacturing For Crystallizer Propeller

Industrial Crystal Process is one of the key technologies on chemical and pharmacy industry. It is a kind of manufacturing and separating technologies, which is of high efficiency and low energy-consuming and environment friendly. Stirrer is a crucial component of stirring type crystallizer; the geometry shape and dimension of Stirrer determine the flow field in the crystallizer. The traditional design & manufacturing process of stirrers is calculating the surface of marine propeller from table of offsets, which is low information-sharing and time-consuming. The quality of propeller cannot be ensured and the dynamic flow performance couldn't also be forecasted by this method. In order to realize rapid design & manufacturing for crystallizer propeller, this paper systemically studies the key problems, such as the CAD/CAE/CAM integration technology, the optimizing technology for propeller structure parameters and NC milling process of propeller, and etc, which are critical factors in the rapid design & manufacturing of crystallizer propeller. The main contents and innovation are as following:1. The innovation idea of integrated manufacturing is presented for crystallizer propeller. The whole frame of CAD/CAE/CAM integrated system of propeller is constructed. OO (Object Oriented) technology based on the feature is applied to set up the integrated propeller data model, which provides a united propeller data model for the whole design and manufacturing process of propeller. The system gets rid of the defect of traditional method, in which every stage such as design,analysis and manufacturing is separated independently and messages cannot be shared in different stages. Using our method, all stages such as CAD, CAE and CAM for propeller are integrated effectively and the messages are shared widely. The cycle of propeller design & manufacturing is shortened greatly.2. A new structure design method is proposed for large propeller. The blades and hub of the propeller are designed and manufactured separately and assembled by welding. This method solves the machining problem for large propeller. The main structure parameters of propeller and shape of root of blade are optimized for propeller assembling by using Calculating Fluid Dynamics software. And on the basis of Solid Dynamics Analyzing, the intensity and rigidity of propeller are checked by using ANSYS software, in order to optimize the thickness of blade. The weight of propeller be optimized is more light and needs less jointing work for assembly.3. The NC machining process of propeller is studied and a new 5-axis based NC milling process of propeller casting wood-model was also proposed. The 3D math data of propeller was built based on the propeller design platform and 5-axis NC milling code for machining propeller casting wood-model was also generated. The casting wood-model made by this method has higher casting precision and quality. The fixing method of propeller is determined, and the special clamp and assistant support is designed for machining propeller in 3-axis NC machine tool. We also studied NC machining tool path plan for stainless steel propeller. At last, the tool path is checked. According to the principle of Taguchi design of experiments method, predictive cutting force models are developed, and the recommendation values of the ball-end milling parameter are presented for casting stainless steel propeller-blade. Reasonable high speed milling parameters of the flat-end milling are obtained in machining smooth blade area exactly by high speed milling experiments.4. Basing on the UG software platform, the propeller rapid design & manufacturing integrated system is developed by using OPEN GRIP redevelopment tool. An algorithm is introduced to calculate feature points of propeller and the 3D math data of propeller is constructed. As an example, the 880 propeller was designed and machined, in which the above method is used. Because of high productivity and good machining quality in the process, the result of this research task is satisfied.The above research results enriches the design and manufacturing technology of industry crystal facility and raises hi-tech value in the crystallizer whole set in our country.