Progressive forging forming method for large cake forged pieces

Abstract

The invention discloses a progressive forging forming method for large cake forged pieces. The method comprises the following steps of: installation and regulation; first single-side forming; second, third and fourth single-side forming; multiple turnover forming; and rounding and reshaping. By adopting progressive anvil distribution and anvil conveying modes, progressive contact of anvils and forged pieces in each anvil pressing process is ensured; three-directional pressure stress is provided for promoting elimination and recovery of internal gap defects; single metal flowing direction is improved; because of the adoption of progressive forging, local deformation is asynchronous, press load is reduced, the production efficiency of equipment is improved, the forming force is reduced, and high work efficiency with the small equipment is realized; and small forging ratio formation can be realized, and the processing period is shortened so as to reduce the production cost.

Description

technical field [0001] The invention belongs to the technical field of free forging, and in particular relates to a progressive forging forming method for large cake forgings. Background technique [0002] Most of the large-scale cake forgings are key components for manufacturing major technical equipment. The common large-scale cake forgings include: nuclear power pressure vessels, steam turbine impellers, large heads, large press cylinder bottoms and other forgings. High cost and high quality requirements. At present, my country's large forging industry has the characteristics of scattered productivity, low production efficiency, aging equipment, low production capacity, and low level of mechanization. At present, it is still mainly relying on innovative technology to achieve "small equipment to do big work". For this reason, the optimization of the process is very important. . Commonly used forming methods for large cake forgings include: lower flat anvil drawing length,...

AI Technical Summary

Problems solved by technology

During the forming process, the contact surface between the anvil and the workpiece is relatively fixed, and it is easy to produce obvious axial and transverse tensile stress, which is not conducive to the elimination and repair of internal void defects and is easy to induce microcracks. At the same time, the metal flow direction is single, lacks continuity, and the mechanical properties The anisotropy is serious, and the uniformity of forming cannot be guaranteed; because the contact surface between the anvil and the workpiece is relatively fixed, the load of the press remains high, and the production capacity of the press cannot be fully utilized. The productivity is low, which increases the difficulty of forming

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