Patent ID: 6487771
Filing Date: 2002-12-03
Classification: H01F,H04R,Y10T

Abstract:
A method for manufacturing a speaker bottom yoke, which comprises steps of:calculating a product weight for the speaker bottom yoke based on desired dimensions; cutting off a bottom yoke blank material with the calculated weight from a steel bar; and continuously performing multiple stages of forging to forge the bottom yoke blank material without annealing the bottom yoke blank material; the multiple stages of forging comprising a first forging stage, a second forging stage, and a third forging stage; during the first forging stage, one end of the bottom yoke blank material is forged into a stem section with a reduced diameter; during the second forging stage, another end of the bottom yoke blank material is forged into a bottom disc with larger diameter; and during the third forging stage, the bottom disc of the bottom yoke blank material is a further forged in to a predetermined dimension of the speaker bottom yoke.