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Forging method of lower sealing head forge piece of one-mega kilowatt nuclear-power reactor pressure vessel

A technology of pressure vessels and reactors, applied in the direction of metal processing equipment, etc., can solve problems such as the lack of mature manufacturing technology and production equipment capabilities, and achieve the effects of reasonable distribution of metal streamlines, uniform composition, and stable performance

Active Publication Date: 2010-12-01
SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD +1
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Problems solved by technology

The development of my country's nuclear power industry has a history of more than 30 years. It has always been based on the research and trial production of small-scale nuclear power equipment, and has not formed mature manufacturing technology and production equipment capabilities.

Method used

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  • Forging method of lower sealing head forge piece of one-mega kilowatt nuclear-power reactor pressure vessel
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  • Forging method of lower sealing head forge piece of one-mega kilowatt nuclear-power reactor pressure vessel

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Embodiment Construction

[0017] The present invention provides a forging method for the lower head forging of a million-kilowatt nuclear power reactor pressure vessel, which can be applied to the lower head with a material of 16MND5. In this example, the parameters of the lower head's delivery state: the inner radius of the ball is 2035mm , The wall thickness is 135mm, the height is 1035mm; and the smelted double vacuum ingot parameters: the diameter of the riser end is 2320mm, the diameter of the bottom end is 2055mm, and the height of the ingot is 2625mm. Therefore, the double vacuum ingot needs to be forged to meet the requirements The size requirements of the lower head.

[0018] Use the following method to forge a double vacuum ingot of 16MND5 material:

[0019] A 12,000-ton hydraulic press was used to forge a double vacuum steel ingot with a diameter of 2320 mm at the riser end, a diameter of 2055 mm at the bottom end, a height of 2625 mm, and a weight of 103 tons. The forging process is divided int...

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Abstract

The invention discloses a forging method of a lower sealing head forge piece of a one-mega kilowatt nuclear-power reactor pressure vessel. In the method, a double-vacuum steel ingot made of 16MND5 with a weight of 103 tons is forged by using a hydraulic press of 12,000 tons, wherein the forging process sequentially comprises the following steps of: drawing: heating the double-vacuum steel ingot to 1,220+ / -10 DEG C, and changing a length of 2,625mm into 4,600mm; gas cutting blanking: removing a section of the bottom end of the forge piece to change the length of 4,600mm into 3,450mm, wherein the bottom of the double-vacuum steel ingot is guaranteed to be sufficiently cut off; upsetting: raising the temperature to 1,240+ / -10 DEG C and changing the length of 3,450mm into 290mm; rough machining: roughly machining the forge piece blank into a cake shape, wherein the diameter of the cake is 5,000mm, and the thickness is 220mm; and stamping and forming: heating the forge piece to 1,000+ / -10 DEG C and putting the forge piece on a special die for stamping and forming until the forging ratio reaches 1.2, and the forge piece forms a spherical crown shape. The invention can ensure that the forged lower sealing forge piece has the advantages of dense material, uniform component, reasonable metal streamline distribution and stable property.

Description

Technical field [0001] The invention relates to a method for manufacturing large forgings, in particular to a method for forging the lower head forgings of a million-kilowatt nuclear power reactor pressure vessel. Background technique [0002] At present, global nuclear power has entered a period of rapid development. In order to improve the energy structure, all industrialized and developing countries are actively committed to the development of nuclear power. In recent years, the power shortage has become a bottleneck restricting the sustained and rapid development of China's economy. As an important measure to save energy and adjust the energy structure, nuclear power has been included in the national power development plan. The development of my country's nuclear power industry has a history of more than 30 years. It has always focused on the research and trial production of small-scale nuclear power equipment, and has not formed mature manufacturing technology and production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00
Inventor 陶志勇贾天意孙立锋
Owner SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD
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