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Method for forging upper shell of nuclear power equipment with outer bench

A technology of external steps and nuclear power, applied in the field of forging, can solve the problems of prolonging the product production cycle, increasing machining allowance, and heavy forging weight, and achieve the effect of reducing machining allowance, reducing forging allowance, and stable performance

Active Publication Date: 2012-12-19
SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] However, due to the high quality requirements for forgings in nuclear power projects and the high weight of forgings, the forging allowance of the existing straight forging method is very large, and the weight of the steel ingot is also very large. At the same time, the machining allowance is increased and the extension production cycle

Method used

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  • Method for forging upper shell of nuclear power equipment with outer bench
  • Method for forging upper shell of nuclear power equipment with outer bench
  • Method for forging upper shell of nuclear power equipment with outer bench

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Embodiment Construction

[0022] The forging method of the upper cylinder body of the nuclear power equipment with outer steps of the present invention, such as Figure 7 As shown, using a 16,500-ton hydraulic press, the material is Grade 3 Class 1 in SA-508, the weight is 300-340 tons, the diameter is Φ3500mm, and the height is 3970-4500mm. , the inner diameter is Φ3490~Φ3890mm, the height is 4180~4580mm, the upper cylinder with outer steps, the forging method is divided into the following steps:

[0023] The first step is to pull out the length; figure 1 The electroslag ingot shown is heated to 1220°C and stretched, changing the length from 3970 to 4500mm to 5840 to 6620mm, as figure 2 As shown, make the forging ratio reach 1.47; if the temperature of the forging falls below 850°C during the elongation process, reheat the forging to keep the temperature of the forging within the range of 850-1220°C;

[0024] The second step is gas cutting blanking; the blanking length is 5420-6200mm, the riser end...

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Abstract

The invention discloses a method for forging an upper shell of nuclear power equipment with an outer bench. The method comprises the following steps of: forging an electroslag ingot into an upper shell with the outer bench by a 16500-ton hydraulic press, wherein material of the electroslag ingot is Grade 3 Class 2 of SA-508 and weight of the electroslag ingot is 300-340 ton; the forging method is as follows in details: step 1, drawing out the electroslag ingot; step 2, carrying out oxygen-acetylene cutting and blanking the electroslag ingot; step 3, upsetting the electroslag ingot; step 4, forging a centre hole; step 5, drawing out and segregating the electroslag ingot; and step 6, carrying out chambering. According to the method disclosed by the invention, temperature in a forging process is strictly controlled to keep the temperature of forging pieces to be 850-1240 DEG C constantly; a forging ratio of the electroslag ingot in each step is guaranteed; the outer bench of the upper shell is forged and formed directly, so that forging allowance and machining allowance are reduced; and in addition, the forged and formed forge pieces are not easily to be cracked, and the forge pieces are uniform in wall thick, dense in material, uniform in composition, reasonable in metal flow line distribution and stable in property.

Description

technical field [0001] The invention relates to a forging method, in particular to a forging method for an upper cylinder of nuclear power equipment with outer steps. Background technique [0002] At present, the global nuclear power industry has entered a period of rapid development. In order to improve the energy structure, all industrialized countries and developing countries are actively committed to the development of nuclear power. The United States regards the expansion of nuclear energy as an important part of its national energy policy. A considerable part of the more than 100 nuclear power plants currently in use needs to be replaced; Russia has developed a large-scale nuclear power plan, and 5 units are already under construction; Japan The government plans to build 13 new nuclear power plants before 2010, and build another 7 nuclear power plants after 2011; besides China, Japan, and South Korea, 11 countries in Asia have proposed to develop nuclear power. Before...

Claims

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Application Information

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IPC IPC(8): B21J5/08B21J5/10
Inventor 陈永波孙立峰王丽君乔志洲
Owner SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD
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