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Production method of large hydroelectric thrust block

A production method and thrust head technology, applied in the metallurgical field, can solve the problems of poor serviceability of high-performance castings, low yield of large-scale castings, high product cost, etc., so as to reduce the welding maintenance rate, improve the yield, and promote energy conservation and environmental protection. The effect of technological development

Active Publication Date: 2021-12-03
石钢京诚装备技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In recent years, with the rapid development of the world economy and technology, the foundry industry has also achieved rapid development. The market share of Chinese castings remains the first in the world, and the output of various castings has continued to grow. In 2018, the output reached more than 49.35 million tons , accounting for about one-third (29.5%) of the total global output, of which hydropower products only accounted for 2.4% of the total output. Compared with developed countries, my country still has a large gap in the overall level of castings, mainly in high-performance castings Poor serviceability, low yield and high repair rate of large castings; resulting in high product costs and serious waste of raw materials

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  • Production method of large hydroelectric thrust block

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Embodiment 1

[0031] The specifications of the large-scale hydroelectric thrust head in this embodiment: diameter: 5000mm, maximum wall thickness ξ of the thrust head: 137.5mm, and unit weight 80t.

[0032] The production method of the large-scale hydroelectric thrust head of the present embodiment comprises the following steps:

[0033] (1) Casting process design: the pouring model adopts the core riser design, and the pouring model includes: casting 1, middle integral core 2, wall core 3, wall core head 4, dark riser 5, breathable mandrel 6 , exhaust hole 7, cover core 8, casting riser 9; wherein, the middle integral core 2 and wall core 3 surround the casting 1 cavity, the wall core 3 is fixed with the wall core head 4, and the cover core 8 is connected to the middle integral core 2. Wall core 3, a dark riser 5 is provided in the wall core 3, the ventilating mandrel 6, and the exhaust hole 7 are connected in the wall core 3, the dark riser 5, and the cover core 8, and castings are provid...

Embodiment 2

[0049] The specifications of the large-scale hydroelectric thrust head in this embodiment: diameter: 4500mm, maximum wall thickness ξ of the thrust head: 120mm, and unit weight 80t.

[0050] The production method of the large-scale hydroelectric thrust head of the present embodiment comprises the following steps:

[0051] (1) Casting process design: the pouring model adopts the core riser design, and the pouring model includes: casting 1, middle integral core 2, wall core 3, wall core head 4, dark riser 5, breathable mandrel 6 , exhaust hole 7, cover core 8, casting riser 9; wherein, the middle integral core 2 and wall core 3 surround the casting 1 cavity, the wall core 3 is fixed with the wall core head 4, and the cover core 8 is connected to the middle integral core 2. Wall core 3, a dark riser 5 is provided in the wall core 3, the ventilating mandrel 6, and the exhaust hole 7 are connected in the wall core 3, the dark riser 5, and the cover core 8, and castings are provided...

Embodiment 3

[0067] The specifications of the large-scale hydroelectric thrust head in this embodiment: diameter: 4900mm, maximum wall thickness ξ of the thrust head: 162.5mm, and unit weight 60t.

[0068] The production method of the large-scale hydroelectric thrust head of the present embodiment comprises the following steps:

[0069] (1) Casting process design: the pouring model adopts the core riser design, and the pouring model includes: casting 1, middle integral core 2, wall core 3, wall core head 4, dark riser 5, breathable mandrel 6 , exhaust hole 7, cover core 8, casting riser 9; wherein, the middle integral core 2 and wall core 3 surround the casting 1 cavity, the wall core 3 is fixed with the wall core head 4, and the cover core 8 is connected to the middle integral core 2. Wall core 3, a dark riser 5 is provided in the wall core 3, the ventilating mandrel 6, and the exhaust hole 7 are connected in the wall core 3, the dark riser 5, and the cover core 8, and castings are provid...

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Abstract

The invention discloses a production method of a large hydroelectric thrust block. The production method comprises the steps of casting process design, pouring and heat treatment. Through the design of a casting model and the selection of ingredients, the heat treatment modes of normalizing, normalizing cooling, tempering and tempering cooling are adopted, so that the mechanical properties of a casting is improved, and the uniformity of the properties of the casting is ensured; and by compiling the optimal casting process, designing a riser and a mold core and selecting a molding material, the defects of cracks, shrinkage cavities and shrinkage porosity are avoided, and the nondestructive testing and performance requirements of the casting are met. The mechanical properties of the large hydroelectric thrust block produced by the production method are as follows: Rm is 520-600MPa, Reh is 300-350MPa, the elongation As after fracture is 15-30%, the percentage reduction of area Z is 30-50%, and Kv is greater than or equal to 39J (0 DEG C); and for nondestructive testing, the qualification rate of magnetic powder flaw detection and ultrasonic flaw detection reaches more than 95%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method of a large-scale hydroelectric thrust head. Background technique [0002] In recent years, with the rapid development of the world economy and technology, the foundry industry has also achieved rapid development. The market share of Chinese castings remains the first in the world, and the output of various castings has continued to grow. In 2018, the output reached more than 49.35 million tons , accounting for about one-third (29.5%) of the total global output, of which hydropower products only accounted for 2.4% of the total output. Compared with developed countries, my country still has a large gap in the overall level of castings, mainly in high-performance castings Poor serviceability, low yield and high repair rate of large castings; resulting in high product costs and serious waste of raw materials. With the formation and development of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C9/08B22C9/10B22C9/22C21D1/18C21D1/28C21D6/00C21D9/00C22C38/02C22C38/04C22C38/40
CPCB22C9/02B22C9/088B22C9/103B22C9/22C22C38/02C22C38/04C22C38/40C21D1/28C21D1/18C21D9/0068C21D6/004C21D6/005C21D6/008Y02E10/20
Inventor 高鹏梁梦强王伟峰司东旭
Owner 石钢京诚装备技术有限公司