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Forging method of conical cylinder body of nuclear power equipment

A technology for a conical cylinder and equipment, which is applied in the field of forging, can solve the problems such as the inability to manufacture the conical cylinder of nuclear power equipment and the large weight of forgings, and achieve the effects of reasonable distribution of metal streamlines, dense forging materials and stable performance.

Inactive Publication Date: 2011-03-23
SHANGHAI HEAVY MACHINERY PLANT
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  • Abstract
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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, it is impossible to manufacture conical cylinders for nuclear power equipment using existing forging methods

Method used

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  • Forging method of conical cylinder body of nuclear power equipment
  • Forging method of conical cylinder body of nuclear power equipment
  • Forging method of conical cylinder body of nuclear power equipment

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Embodiment Construction

[0023] The forging method of the conical cylinder of nuclear power equipment in the present invention uses a 16,500-ton hydraulic press to forge a double-vacuum steel ingot with a material of 18MND5, a weight of 185 tons, a diameter of 2878mm on the top of the ingot, a diameter of 2481mm on the bottom of the ingot, and a height of 3298mm. To become a tapered cylinder with an outer diameter of 4955mm, an inner diameter of 4240mm, a height of 2720mm, and a taper of 15 degrees on one side, the forging method is divided into the following steps:

[0024] The first step is to pull out the length; figure 1 The double-vacuum ingot shown is heated to 1220°C and stretched, changing the length of 3298mm to 4800mm, such as figure 2 As shown, make the forging ratio up to 1.45; 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;

[0025] The second step is to cut the m...

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Abstract

The invention discloses a forging method of a conical cylinder body of nuclear power equipment. The conical cylinder body is formed by forging 18MND5 and 185 tons of double vacuum steel ingots by using a 16,500-ton hydraulic press. The forging method comprises the following steps of: drawing out; oxygen-acetylene cutting; continuous upsetting; forging a center hole; drawing out and separating materials; and reaming. According to the forging method of the conical cylinder body of the nuclear power equipment, the temperature can be strictly controlled in the forging process, so that the temperature of a forging piece is always maintained in a range of 850-1,240 DEG C, the forging ratio at each step can be ensured and the forging piece formed by forging is not easy to generate cracks and hasuniform wall thickness; and the forging piece has the advantages of dense material, uniform components, reasonable metal streamline distribution and stable performance.

Description

technical field [0001] The invention relates to a forging method, in particular to a forging method of a nuclear power conical cylinder. Background technique [0002] At present, global nuclear power 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, and a considerable part of the more than 100 nuclear power plants in service needs to be replaced; Russia has formulated a large-scale nuclear power plan, and 5 units are already under construction; the Japanese government proposed The nuclear power country 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 2020,...

Claims

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Application Information

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IPC IPC(8): B21J5/06B21J5/08B21J5/10B21J1/06
Inventor 陈永波林岳萌陶志勇
Owner SHANGHAI HEAVY MACHINERY PLANT
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