Hot plastic working method
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsYoshihisa Serizawa, Yoshiharu Miyake
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Abstract
To provide a hot working method which can reduce working resistance during the early stage of hot plastic working, particularly extrusion and forging using a die. A hot plastic working method characterized by comprising the step of plastically working, using a die, a material having a structure of not more than 50 .mu.m in average grain diameter with dispersed spherical grains ranging in size from 10 to 200 nm, the working material having a recess formed on a surface thereof in its site facing a closed space formed by abutting the working material against the die surface at the time of plastic working.
Claims7
A hot plastic working method comprising the steps of:
- providing a working material with a structure having an average grain diameter of not more than 50 .mu.m and dispersed spheroidal grains ranging in size from 10 to 200 .mu.m;
- forming a recess circumscribed with a die hole on a surface at an end portion of said working material;
- setting said working material in a hot working die having a same inner configuration of said die hole from entry side to outlet side;
- providing heating equipment to heat both said working material and said die;
- and
- hot plastic working said working material so that said recess faces to the site of a closed space formed by abutting said working material against said die at the time of hot plastic working.
Dependencies are inferred from the claim text.