Transactions of Materials and Heat Treatment

Title：Forging stretch process for head sink basin

Authors： Hu Zhaohai

Unit： Sichuan Vocational and Technical College

KeyWords： nuclear power head sink basin stretch deformation bottom thinning wall thickness improvement

ClassificationCode：TG31

year,vol(issue):pagenumber：2017,42(3):20-26

Abstract：

For the problem of stretch deformation in the forging process of integral head for nuclear power, the stretch process of head sink basin was analyzed under the changing temperature from the perspective of the stress and strain. Then, it was summarized that the head final strain characteristics, the static water pressure distribution law and the reason of “stretch convex platform” and “bottom thinning”. A solution was put forward as “upsetting cake-first forming basin-correct-second forming basin-correct-stretch”. Through the comparative study on the 720, 760 and 800 mm stretch values, the result shows that 760 mm stretch value can improve the uneven head thickness, the head stress distribution and mechanical processing. Thus, AP1000 nuclear power vessel lid forgings and CPR1000 water chamber head are produced successfully based on the above research result.

Funds：

国家科技支撑计划(2007BAF02B01)

胡照海（1965-），男，硕士，副教授

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