Abstract: An extrusion method capable of performing extrusion by means of an extrusion die that can improve oxidation resistance while maintaining the excellent performance of titanium sintered body is provided. The present invention is directed to an extrusion method in which an extrusion material F is extruded through an extrusion hole 33 of a main die body 31. A main die body 31 is prepared, wherein the main die body 31 is constituted by surface-coated cermet material 1 containing cermet base material 11 formed of a sintered body including at least one or more titanium compounds selected from the group consisting of titanium carbide, titanium nitride, and titanium carbonitride as a main component, and an oxidation resistant film 12 formed on a section on the cermet base material 11 corresponding to at least an inner peripheral surface of the extrusion hole and formed of a complex oxide containing titanium. The extrusion die is preheated to a temperature of 420 to 520° C. before initiating the extrusion.

Abstract: A processing solution for forming an oxidation resistant film on a surface-coated cermet member is provided, wherein the processing solution is capable of easily forming an oxidation resistant film improving the oxidation resistance while maintaining the excellent performance of a titanium sintered body. The composition of the processing solution of the present invention includes a metal salt which creates a complex oxide by reacting with a titanium compound and 20 mass % or more of a solvent. It is preferable that the metal salt is a transition metal of divalent iron ion. An oxidation resistant film 12 containing a complex oxide can be formed by heating the processing solution of the present invention after applying it to a cermet base material 11.

Abstract: A die 10 has a die case 20 arranged with a pressure receiving surface 22 of a pressure receiving portion 21 facing rearward so as to oppose to an extrusion direction, a male die 30 and a female die 40 mounted in the die case 20. The pressure receiving portion 22 is formed into a rearwardly protruded convex shape. A plurality of metal material introducing portholes 24 are formed in an external periphery of the pressure receiving portion 21. It is configured such that the metal material pressed against the pressure receiving surface 22 is introduced into the die case 20 via the portholes 24 and passes through the extrusion hole 11. B/A is adjusted to 1.8 to 6.0 and D/B is adjusted to 0.15 to 0.4, where “A” is a product circumscribed circle diameter, “B” is a pressure receiving surface external diameter, “C” is a between-hole-wall inlet side minimum thickness size, “n” is the number of the between-hole-walls, and “D” is a between-hole-wall inlet side total thickness size obtained by “C”דn.

Abstract: In some preferred embodiments, an extrusion die for metallic material capable of obtaining a high quality extruded article can be provide while securing sufficient strength and durability. The extrusion die is provided with a die holding case 20 having a dome portion 21 with an external surface functioning as a metallic material pressure receiving surface 22, the metallic material pressure receiving surface 22 being disposed so as to face rearward, a male die 30 held in the die holding case 21, and a female die 40 held in a front portion of the die holding case 20. The metallic material pressure receiving surface 22 is formed into a convex configuration, and a porthole 24 is formed in the dome portion 21. The central axis A2 of the porthole 24 is inclined to the central axis A1 of the die holding case 20. The metallic material pressed against the metallic material pressure receiving surface 22 is introduced into the die holding case 20 through the porthole 24 and passes through the extrusion hole 11.

Abstract: A surface-covered cermet member capable of improving an oxidation resistance while maintaining excellent performance of a titanium series sintered compact is provided. The invention is directed to a surface-covered cermet member in which an oxidation resistant film 12 is formed on a cermet base material 11 made of a sintered compact containing at least one or more titanium compounds selected from titanium carbide, titanium nitride, and titanium carbonitride as a major component of a hard phase. In the surface-covered cermet member of the present invention, the oxidation resistant film 12 is constituted by a complex oxide containing titanium.

Abstract: A molten residual layer formed on a surface 26 of an electric-discharge machined portion 12 of a metal molding member 1 is eliminated by using a tool 70 made by a wire discharge grinding method. According to the wire discharge grinding method, a minute tool which is high in processing accuracy and high in hardness can be obtained. Since the molten residual layer formed on a surface 26 of the portion 12 due to the electric-discharge machining is eliminated by using the tool, the molten residual layer can be eliminated uniformly with high accuracy.

Abstract: A molten residual layer formed on a surface 26 of an electric-discharge machined portion 12 of a metal molding member 1 is eliminated by using a tool 70 made by a wire discharge grinding method. According to the wire discharge grinding method, a minute tool which high in processing accuracy and high in hardness can be obtained. Since the molten residual layer formed on a surface 26 of the portion 12 due to the electric-discharge machining is eliminated by using the tool, the molten residual layer can be eliminated uniformly with high accuracy.

Abstract: A die 10 has a die case 20 arranged with a pressure receiving surface 22 of a pressure receiving portion 21 facing rearward so as to oppose to an extrusion direction, a male die 30 and a female die 40 mounted in the die case 20. The pressure receiving portion 22 is formed into a rearwardly protruded convex shape. A plurality of metal material introducing portholes 24 are formed in an external periphery of the pressure receiving portion 21. It is configured such that the metal material pressed against the pressure receiving surface 22 is introduced into the die case 20 via the portholes 24 and passes through the extrusion hole 11. B/A is adjusted to 1.8 to 6.0 and D/B is adjusted to 0.15 to 0.4, where “A” is a product circumscribed circle diameter, “B” is a pressure receiving surface external diameter, “C” is a between-hole-wall inlet side minimum thickness size, “n” is the number of the between-hole-walls, and “D” is a between-hole-wall inlet side total thickness size obtained by “C”דn.

Abstract: A die assembly P1 is configured such that an extrusion die 10 is mounted in a die mounting hole 61 formed in a die mounting plate 60 and a metallic material introduced in the die mounting hole 61 is introduced in the extrusion die 10 via a porthole 24 formed in a metallic material pressure receiving surface 22 of the die 10. A material accumulating portion 70 extending to a point on a more extrusion directional downstream side than an inlet position of the porthole 24 is provided outside the porthole 24 in the die mounting hole 61 to accumulate a part 75 of the metallic material introduced into the die mounting hole 61.

Abstract: In some preferred embodiments, an extrusion die 10 for a metallic material includes a die case 20 having a pressure receiving portion 21 with a metallic material pressure receiving surface 22 faced rearward against an extrusion direction, a male die 30 disposed in the die case 20, and a female die 40 disposed in the die case 20. The pressure receiving portion 21 is formed into a convex configuration protruded rearward, and a porthole 24 for introducing the metallic material is provided in an outer periphery of the pressure receiving portion 21. A ratio of a flat state opening area Sb of a porthole inlet portion 24e to a flat state area Sa of the pressure receiving portion 21 is set to 0.15 to 0.80. The extrusion die is configured such that the metallic material pressurized against the metallic material pressure receiving surface 22 is introduced into the die case 20 via the porthole 24 and passes through the extrusion hole 11.

Abstract: In some preferred, embodiments, an extrusion die for a metallic material capable of obtaining a high quality extruded article can be provide while securing sufficient strength and durability. The die is provided with a male die case 20 having a pressure receiving portion 21, a female die case 25, a male die 30 provided in the male die case 20, and a female die 40 provided in the female die case 25. The pressure receiving portion 21 is formed into a convex configuration protruded rearward, and a porthole for introducing a metallic material is formed in the external periphery of the pressure receiving portion. A press-fitting connecting portion 21a is formed at the front side of the male die case 20 and a press-fitting dented portion 25a is formed at the rear side of the female die case 25.

Abstract: In some preferred embodiments, an extrusion die for metallic material capable of obtaining a high quality extruded article can be provide while securing sufficient strength and durability. The extrusion die is provided with a die holding case 20 having a dome portion 21 with an external surface functioning as a metallic material pressure receiving surface 22, the metallic material pressure receiving surface 22 being disposed so as to face rearward, a male die 30 held in the die holding case 21, and a female die 40 held in a front portion of the die holding case 20. The metallic material pressure receiving surface 22 is formed into a convex configuration, and a porthole 24 is formed in the dome portion 21. The central axis A2 of the porthole 24 is inclined to the central axis A1 of the die holding case 20. The metallic material pressed against the metallic material pressure receiving surface 22 is introduced into the die holding case 20 through the porthole 24 and passes through the extrusion hole 11.

Abstract: An extrusion die for manufacturing a tube with a plurality of small hollow portions arranged in a width direction of the tube, includes a female die for defining an outer periphery of the tube and a mandrel combined with the female die. The mandrel includes a body portion and a comb-shaped portion protruded from the body portion, the combe-shaped portion including a plurality of columnar portions desposed in a width direction of the comb-shaped portion at certain intervals. An outer periphery of a tip end portion of each of the plurality of columnar portion constitutes a bearing portion for defining an inner periphery of each of the plurality of small hollow portions of the tube. Each of the plurality of columnar portions has outside surfaces opposed in a thickness direction of the comb-shaped portion, and at least one of the outside surfaces has an inwardly dented portion behind the bearing portion, the inwardly dented portion constituting an extrusion material filling space.

Abstract: A molten residual layer formed on a surface 26 of an electric-discharge machined portion 12 of a metal molding member 1 is eliminated by using a tool 70 made by a wire discharge grinding method. According to the wire discharge grinding method, a minute tool which high in processing accuracy and high in hardness can be obtained. Since the molten residual layer formed on a surface 26 of the portion 12 due to the electric-discharge machining is eliminated by using the tool, the molten residual layer can be eliminated uniformly with high accuracy.

Abstract: An extrusion die for manufacturing a tube with a plurality of small hollow portions arranged in a width direction of the tube, includes a female die for defining an outer periphery of the tube and a mandrel combined with the female die. The mandrel includes a body portion and a comb-shaped portion protruded from the body portion, the combe-shaped portion including a plurality of columnar portions desposed in a width direction of the comb-shaped portion at certain intervals. An outer periphery of a tip end portion of each of the plurality of columnar portion constitutes a bearing portion for defining an inner periphery of each of the plurality of small hollow portions of the tube. Each of the plurality of columnar portions has outside surfaces opposed in a thickness direction of the comb-shaped portion, and at least one of the outside surfaces has an inwardly dented portion behind the bearing portion, the inwardly dented portion constituting an extrusion material filling space.