Hot extrusion device and method for molybdenum and molybdenum alloy

Abstract

The invention discloses a hot extrusion device for molybdenum and molybdenum alloy. The hot extrusion device comprises an extrusion die, the extrusion die is internally provided with an extrusion channel, and the middle of the extrusion channel retracts; the extrusion die is sleeved with a heat-preservation preheating device; the hot extrusion device further comprises a vertical hydraulic press and a pair of overturn extrusion devices, the overturn extrusion devices are used for turning over and laterally extruding the extrusion die, and the vertical hydraulic press is used for longitudinallyextruding and heating the molybdenum or molybdenum alloy in the extrusion channel. The invention further discloses a hot extrusion method for the molybdenum and molybdenum alloy. The method comprisesthe steps of preheating of the extrusion die, die combination and preheating, extrusion molding and 2-5 times of repeated extrusion molding. The hot extrusion device can unevenly extrude the molybdenum and molybdenum alloy in three phases, and large-sized even grain-refined molybdenum and molybdenum alloy are obtained; by means of the hot extrusion method, obtained finished materials of molybdenumand molybdenum alloy can be even in structure and refinement degree.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a hot extrusion device for molybdenum and molybdenum alloys, and also relates to a hot extrusion method for molybdenum and molybdenum alloys. Background technique [0002] Industrial molybdenum alloys have been widely used in aerospace, electronics, atomic energy, light industry, chemical industry, metallurgy and glass industries. In industry, molybdenum and molybdenum alloy nail blanks are traditionally prepared by casting, pressing, sintering and powder metallurgy. Among them, the casting method includes electric arc, electron beam, and vacuum shell casting methods. With the application of refractory metals as structural materials in special technical departments, the purity of materials is required to be higher and higher. It is necessary to purify and produce large casting blanks by vacuum electron beam or arc melting method, and plastically process...

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Problems solved by technology

[0005] In the prior art, reciprocating extrusion is used to improve the hot extrusion effect of molybdenum and molybdenum alloys, and to prepare large-volume uniform fine-grained materials, but due to the unidirectional extrusion force, the material is easily bent and lost under a large extrusion force. In addition, heating and heat preservation measures are not in place, it is easy to cause uneven material structure, unsatisfactory refinement, and it also has the disadvantages of large equipment volume, large floor area, and high cost.

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