Hot extrusion forging die for use in titanium alloy

A method for manufacturing an extruded work, which manufactures the extruded work by extrusion working a titanium alloy-made billet by the use of a hot extrusion forging die for use in titanium alloy having the following construction through the execution of the following steps in such a way as to diameter-reduce the outside diameter of the billet and then by taking out the extruded work,

• the hot extrusion forging die for use in titanium alloy having a construction which includes:
• a ceramic-made die member into which the billet is forcedly inserted;
• an inside reinforcement ring disposed around the die member by shrinkage fitting and made of steel having a toughness;
• an outside reinforcement ring disposed around the inside reinforcement ring such that the outside reinforcement ring has an interference with respect thereto and made of steel having a toughness;
• and
• a punch hammered into the die member,
• the method comprising:
• a step of coating the billet with a lubricant which is not needed to be removed after extrusion working and then heating the billet;
• a step of preheating the die member, inside reinforcement ring and outside reinforcement ring;
• a working step performed by inserting the billet into the die member and hammering the punch thereinto;
• and
• a taking-out step for taking out the extruded work.

A hot extrusion forging die for use in titanium alloy comprising:

• a die member used for extrusion working a titanium alloy-made billet in such a manner as to restrict the outside diameter thereof,
• a guiding die disposed on a billet insertion side of the die member, and
• the die member being made of ceramic,
• wherein the guiding die is made of ceramic.