Abstract: A device for drawing a metal tube capable of sufficiently applying a lubricating oil to an inner surface of a tube at the time of drawing and preventing occurrence of seizures is provided. The device for drawing a metal tube in which drawing is performed by making a metal blank tube 2 pass through between a die 10 for forming an outer surface and a plug 11 for forming an inner surface includes a control unit 31 configured to: measure an elapsed time from a time at which supplying of a lubricating oil L to a surface of the plug 11 is stopped until the metal blank tube 2 is set at a drawing position between the die 10 and the plug 11 and becomes ready to be drawn; control to not perform drawing of the metal blank tube 2 when the measured elapsed time exceeds a preset elapsed time; and control to initiate drawing of the metal blank tube 2 when the measured elapsed time is within a preset allowed time.

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: In an extrusion die in which a mandrel ring is outwardly arranged around a spindle, the present invention aims to enhance the fixing stability of the mandrel ring and enables easy maintenance. The extrusion die includes a mandrel (30) for forming an inner surface of an extruded material. The mandrel includes a spindle (32) and a mandrel ring (35) outwardly arranged around the spindle (32). The mandrel ring (35) is made of a material having a coefficient of thermal expansion smaller than that of a material of the spindle (32).

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 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: 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 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.