PURPOSE: To facilitate a forming process and to improve forming precision by forming all teeth equal in tooth thickness and tooth shape by extrusion, and performing reverse tapering formation and irregular tooth thickness and shape formation with a squeezing die after deburring.
CONSTITUTION: An annular blank material 3 is set in a transfer machine and at its flange part, chamfers 4... are formed by press formation at set intervals. Then, a tooth die which has teeth all equal in thickness and shape and has no sector part is used for extrusion to form equal thickness tooth shapes 6', 6'... at equal intervals over the entire circumference. Then, a work 3' has burrs 8 bridged among said tooth shapes 6'... and those burrs are removed before the work 3' is detached from the transfer machine. After a lubricating treatment, an annular solid type squeezing die 10 which has a taper surface 9 for equal thickness tooth shapes, and a taper surface on the primary side and a reverse taper surface 7" on the other side for irregular tooth shapes is used to squeeze equal thickness tooth shapes 6', 6'..., which are tapered reversely while irregular tooth shapes 7' are formed as prescribed.
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SUGIYAMA EIHIKO
NARUSE YASUHIDE
| JPS4714696A |