| 摘要 |
PURPOSE:To obtain the titled member which has excellent accuracy such as out of roundness and uniform thickness and is provided with required strength, etc., by subjecting annular half-finished iron or steel products to hot forging then to immediate quick cooling and hardening treatment and further to annealing followed by rolling and sizing. CONSTITUTION:Bar materials 1 on a bar material supplying base 1 are heated 2 by high frequencies to 1,000-1,200 deg.C and are fed to a cold forging machine 3, by which the materials are forged in 3 stages at the above-mentioned temp. region to form the annular half-finished products B. The products B are charged 4 into a water tank 5 where the products are subjected to the quick cooling and hardening treatment. The products are thereafter supplied into a temper heating furnace 8 and are annealed and tempered by reheating up to 500-650 deg.C. The tempered products are sent to a rolling machine 9. The products B are reduced in thickness while the thickness deviation is corrected by the rotation of rolling rolls 96 of the machine 9 to form the thin ring members C having the uniform thickness. The members C are then transferred downward by the rotation of a guide disk 91 and are pushed out forward by a push rod 98 so as to be forcibly passed into a sizing 97 when the members stop in the lower part of the disk 91.
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