A high-uniformity short-process forming method for large metal components

Abstract

The invention relates to the field of metal forming, in particular to a high-uniformity short-process forming method for a large metal component. Firstly, a cast alloy cast ingot is subjected to superhigh temperature demolding; then soaking is conducted on the liquid core cast ingot, precise control of the liquid fraction of the core part of the cast ingot is achieved, axial upsetting and rollingare conducted on the cast ingot under a forging press, dendrite at the liquid core of the cast ingot is fully crushed and balled, and a uniform and tiny semisolid structure is formed; and finally radial and axial forging is conducted on the cast ingot, and the cast ingot is forged into the needed large metal component structure. Through the high-uniformity short-process forming method, the problems such as shrinkage cavity and porosity and dendritic segregation in the cast ingot are solved, the central mechanical performance of the large metal component can reach the surface performance level,and uniformity of the overall performance of the component is improved. The core part of the cast ingot forms the uniform and tiny semisolid structure, and thus the final forge piece has good comprehensive performance. Forming pressure is small, the requirement for ability of forging equipment is lowered, the technological process is shortened, and production cost can be lowered effectively.

Description

technical field [0001] The invention relates to the field of metal forming, in particular to a high-uniform short-flow forming method for large metal components. Background technique [0002] With the advancement of science and technology and the needs of modern industrial development, high-end equipment such as aviation, aerospace, electric power, petrochemicals, and ships are developing rapidly in the direction of large-scale, high-parameter, high-reliability and long-life service under extremely harsh conditions, resulting in their Key metal components such as aluminum alloys, magnesium alloys, titanium alloys, high-strength steels, and high-temperature alloys are getting larger in size, complex in structure, and performance requirements are increasing, and the requirements for manufacturing technology for large metal components are also getting higher and higher. [0003] Large metal components are generally forged from large ingots. The ingot is an as-cast structure. D...

AI Technical Summary

Problems solved by technology

The ingot is an as-cast structure. Due to the solidification and shrinkage of the metal, a large number of micro-shrinkage cavities and loose defects are inevitably produced. These hole-type defects are dispersed in the core of the ingot, destroying the continuity of the material; The redistribution of the solute, the solidification end not only has a high alloy concentration, but also often enriches impurity elements, forms dendrite segregation, and destroys the uniformity of the material. This will cause the overall performance of large forgings to be insufficient, and the mechanical properties of forgings in all directions are different. very obvious

Since large metal components are subjected to complex loads such as axial compression, axial tension, internal pressure, external pressure, and local stress concentration, the performance requirements for forgings are extremely high, and forgings manufactured by traditional processes are difficult to meet their use requirements.

On the other hand, the forging of large-scale metal components not only requires heavy-duty forging equipment of more than 10,000 tons and large-scale forging dies, but also requires a large amount of material cutting, low material application rate, long production cycle and high cost.

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