METHOD AND DEVICE FOR FORMING TURBINE BLADE STOCK

PURPOSE:To reduce expense for a die and manufacturing cost by bringing a stock to partial pressure, and also, executing symmetrical cross section forming by replacing successively the die, and subsequently, forging successively the stock to a three- dimensional asymmetrical partial type by width expanding forming and finish forming. CONSTITUTION:From the whole weight of a turbine blade stock 20, a fundamental stock 10 and a primary stock 11 are formed successively. Subsequently, from a round rod, a tapered round rod 12 is obtained by using left and right dies 4, 5. Also, by using the left and the right dies 4, 5 having a symmetrical cross section 16, the round bar cross section is brought to pressure forming successively, and a tertiary stock 13 is formed. Moreover, after reheating, width is expanded to the upper part by pressing the upper part of the symmetrical cross section 16, it is formed to a cross section 17, and the cross section is made asymmetrical. Finally, the cross section 17 is brought to finish forming to a finished cross section 18. Since sequential partial die casting whose deformation is small is executed, it is realize to miniaturize the die, and in a process for using symmetrical cross section forming, the number of dies decreases. In such a manner, the expense of the die and the manufacturing cost are reduced.