Concave extrusion method and extrusion device suitable for nonferrous metal

Abstract

The invention relates to a concave extrusion method and an extrusion device suitable for a nonferrous metal. The extrusion method comprises the following steps: enlarging the metal volume in the central zone to form reverse resistance for resisting against metal flow forming shrinkage, that is, to form a centrosymmetric concave curved surface shape in the central zone of the working end face of the conventional biplane round panel shaped dummy block, utilizing the dummy block to form a convex surface at the tail end of the blank to be deformed during the compressional deformation process, and enforcing the change of the metal deformation at the different degrees. The extrusion device comprises an extrusion seat, an extrusion shaft, an inner core shaft, a core shaft sleeve, an extrusion liner, an extrusion die and a concave dummy block. The extrusion method disclosed by the invention is simple and convenient to operate, and capable of eliminating or shortening the forming process of the shrinkage in the center of the rod-like bar, so as to increase the yield of the material and achieve the remarkable economic benefit. The extrusion device disclosed by the invention is simple and reasonable in structural design, convenient in assembling, low in cost, stable and reliable in use, and high in extrusion efficiency and extrusion precision.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal hot extrusion technology, and in particular relates to a concave extrusion method and an extrusion device suitable for nonferrous metals. Background technique [0002] In the tool system of the horizontal forward extrusion machine, the ingot billet formed by the metal and its alloy is sawed into a suitable ingot billet by using the casting process method, and it is heated (or not heated) to the plasticity of the metal. The deformation temperature zone, and then enter the extrusion deformation working area (cavity) of the extruder for extrusion deformation processing to form the required shape and length of the extruded product. During the extrusion process, the front end of the flat-bottomed extrusion pad is formed into a conical rigid area symmetrical to the center by the molding material. The materials in the conical rigid area and the deformation area of ​​the extrusion front end are d...

AI Technical Summary

Problems solved by technology

During the extrusion process, the front end of the flat-bottomed extrusion pad is formed into a conical rigid area symmetrical to the center by the molding material. The materials in the conical rigid area and the deformation area of ​​the extrusion front end are deformed in the early stage of extrusion, and extruded into an extruded profile , and in the middle and late stages of extrusion, the surface of the extruded material is cooled by the heat absorption of the surface of the extrusion tool, and the pinning retardation effect of the friction of the surface, and the deformation heat in the extrusion deformation zone (deformation generated Influenced by various reasons such as internal heat), it is also affected by the deformation speed of the center, often forming a longer shrinkage, forming waste products, reducing the yield of the product, and causing a lot of waste of finished product materials and economic losses.

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