The Research On The Automatic Design Technology Of The Metal Allowance In Forging Procedures Of Turbine Blade

Turbine blade is a key part in turbine, which plays an important role in energy transformation. The surface of blade is complex, and is one of the most difficult machining parts. Blade is always manufactured by die-forging in the factory. The technique of designing the allowance for machining of blade forgings is the key in forge work. So there are many differences between turbine blade and other parts in this technique. Traditional method of designing the allowance for machining of blade is decided by experience, and this method lacks the related basic theory, and the allowance for machining designed through this method is so big that it will waste materials. According to this, this article analyzed the macroscopical rule of plastic metal flowing and the scope of stress changing during the whole process of materials'transformation, and put forward the better way to design the allowance for machining and more reasonable values of allowance for machining, with some factors which influencing allowance for machining.Because engineers must spend a lot of time in designing a set of forging dies of turbine blades, this will lead to low yield. With the platform of the software of UGNX4.0 and the parameter-entering idea and studying the different methods of trimming the section contour of blade body, this article used the UG/OPEN GRIP language to write the programs of parameter-entering trimming and created the mutual interface, the programs of automatically building the forging dies of blade and the programs of automatically building the profile gauge of blade. All these programs have been proved to improve the working efficiency, leave out the conversion taches of data, and ensure the veracity and consistency of designing data. Thus it made designers devote more time to creating new products, and made the products more competitive in the market.Using the FEM analyzing software of DEFORM-3D, the process of forging blade could be simulated. Then different shapes of sections of turbine blade's stocks could be researched, and the best shape of sections of blade's stocks could be chosen. Finally, this article got the best way to design the allowance for machining of blade's stock through comparing the process of simulating forging blade created by different methods of designing the allowance for machining of blade's stock.