(57) [summary] to remove the (modified with) [purpose] cold forging from during the poppet of the manufacturing process and cutting process. [Configuration] The plate-like material After the disk-shaped workpiece by pressing, a circular plate-like workpieces are the attaching cylindrical portion workpiece by pressing, and the attaching cylinder workpiece is a grooved workpiece by pressing , and the cylindrical portion of the grooved workpiece by pressing or rolling the neck of the poppet (12) and head (13). [Effect] It is possible to manufacture the poppet only by pressing or pressing and rolling, it is possible to reduce the manufacturing time and manufacturing cost of the poppet to be able to simplify and thus the poppet of the manufacturing process.
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