| 摘要 |
PROBLEM TO BE SOLVED: To obtain the long service life of a die by filling a stock to be formed in a forming die having a spiral blade forming part, and controlling the back pressure load according to the filling load to be determined by the height of the blade to form the blade of a scroll member at the uniform eight, and to suppress the filling load to be low. SOLUTION: When a stock to be formed is filled in a forming die having a spiral blade forming part by a forming punch, the back pressure is applied to a blade tip part of the stock to be formed through a spiral sleeve by a hydraulic cylinder, etc. The scroll member having a narrow and tall blade is forged. The back pressure load (f) is controlled by the formula f=a×F+b (where, (a) and (b) are shape influence coefficients) according to the filling load F to the blade forming part of the stock to be formed which is determined by the height (h) of the blade. The filling load F is preferably obtained as the function of the height (h) of the blade in advance. The blade free from defects can be formed with low filling load, and the service life of a die can be increased.
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