Integrated forming method and integrated forming device for large complex thin-walled fine grain casting

Abstract

The invention relates to an integrated forming method and an integrated forming device for a large complex thin-walled fine grain casting. The device is composed of four systems such as a mold temperature control system, a mold ingot withdrawing system, a magnetic pulse disturbing system and a monitoring and controlling system. The method comprises the following steps: generating a temperature gradient from top to bottom in a mold shell melt by means of the multi-area heating precise mold temperature control system; and withdrawing a melt, close to a liquid phase line temperature, at the bottom of the casting out of an insulating area by matching a proper withdrawing speed to achieve progressive solidification of the melt from bottom to top, so that the solidification defects such as looseness are eliminated and the compactness of the casting is improved. On this basis, intense electromagnetic solidification is generated at the front edge of a solid/liquid interface under the instant high energy electromagnetic action at the solidification front of an electromagnetic field to play roles of hindering crystal growth and refining crystal grains intensively as well as refining the solidification structures of the casting. The integrally refined solidification structure is obtained, and in particular, tissues on thick and large parts of the casting are refined. Therefore, cooperative control of integral forming, crystal grain refining and defect control of the large complex thin-walled fine grain casting can be achieved.

Description

technical field [0001] The invention relates to an integrated molding method and device for large complex thin-wall fine-grained castings, belonging to the technical field of metal material preparation. Background technique [0002] A generation of technology, a generation of equipment. The preparation equipment for large and complex thin-walled structural parts has been progressing along with the development of the preparation technology for large and complex thin-walled structural parts. Initially, the traditional gravity casting process was used to prepare large complex thin-walled structural parts in vacuum induction melting furnaces at home and abroad. However, due to the complex shape of large complex thin-walled structural parts and the great difference in wall thickness at different parts, the traditional gravity casting process cannot solve the problems of undercasting, Shrinkage, thermal cracking, deformation and other problems. In order to solve the problems cau...

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Problems solved by technology

[0005] In order to solve the problems of difficult forming of large complex thin-walled castings, coarse grains and low metallurgical quality, the purpose of this invention is to provide an integrated molding method and device for large complex thin-walled fine-grained castings, which adopts multi-zone heating and accurate mold temperature control System design, control the temperature gradient of the melt, slowly pull the mold shell away from the hot zone at a certain pulling speed, make the melt solidify sequentially under the electromagnetic field, and use the strong electromagnetic disturbance generated at the front of the solid / liquid interface to hinder crystal growth and Strongly refine the grains and refine the solidification structure of the castings, so as to achieve the coordinated control of the overall forming, grain refinement and defect control of large complex thin-walled castings

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