Apparatus for producing a hollow poppet valve
OwnerMinoru Noguchi, Hiroyuki Tsuchiyama +1inventors
InventorsMinoru Noguchi, Hiroyuki Tsuchiyama, Masami Yasujima
Life of this patent
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Abstract
A method of producing a hollow valve comprises the step for forming material having a blind hole along its axis, the step for extruding the material in a shaping hole in a die downward and the step for lowering a lower part of a pin to an upper part of a smaller-diameter portion of the shaping hole to allow the material to plastically flow downward through a gap between the lower part of a pin and the smaller-diameter portion of the shaping hole thereby molding a primary intermediate of the hollow valve having a stem and a head at the upper end of the stem through which a hole is formed.
Claims5
1-11. (canceled)
An apparatus for producing a hollow poppet valve, the apparatus comprising a first press that comprises:
- a die having a shaping hole that comprises a larger-diameter portion into which material can be inserted, a squeezing portion which communicates with the larger-diameter portion and tapers downward, and a smaller-diameter portion which communicates with the squeezing portion to form a stem of the poppet valve;
- a ram that rises and lowers above the die;
- a punch attached to the ram, a lower end of the punch being capable of moving into the larger diameter portion of the shaping hole in the die;
- and
- a pin disposed to move up and down in a vertical guide hole along an axis of the punch and connected to the ram, a smallest portion at a lower end projecting from the punch downward to put into the smaller-diameter portion of the shaping hole.
Dependencies are inferred from the claim text.