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Electroslag fusion manufacturing method of a large curved blade slab

一种制造方法、电渣熔铸的技术，应用在大宽厚比曲面铸件制造工艺领域，能够解决难适用等问题，达到提高质量、高抗疲劳性能、提高材料利用率的效果

Active Publication Date: 2019-09-17
SHENYANG RES INST OF FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these two methods are only suitable for the welding of equal-thickness steel plates or ingots, and are difficult to apply to castings with large aspect ratios with irregular cross-sections.

Method used

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  • Electroslag fusion manufacturing method of a large curved blade slab
  • Electroslag fusion manufacturing method of a large curved blade slab
  • Electroslag fusion manufacturing method of a large curved blade slab

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] refer to figure 2 , image 3 , the electroslag fusion manufacturing method of a large curved blade slab according to the present invention, the selected blade slab material is martensitic stainless steel 06Cr13Ni4Mo, the maximum width of the blade is about 4300mm, the maximum height is 3400mm, the maximum thickness is 310mm, and the minimum thickness is 65mm.

[0028] First place the prefabricated slab I5 and prefabricated slab II6 in the zone I and zone III of the crystallizer respectively, and then the transformer 1 connects the bottom water tank 4, zone II and the electrode 3 through wires to form a loop, and the electrode 3 is in the liquid slag 9 Melting under the action of resistance heat, the liquid metal passes through the slag pool to form a molten metal pool 8, and under the action of a strong water-cooled crystallizer (the copper plate on the inner wall of the crystallizer has a spiral groove with a certain angle of rise to increase the cooling intensity), ...

Embodiment 2

[0032] The X-shaped curved blade slab of a power station shown in this experiment is manufactured, and the material is 06Cr16Ni5Mo martensitic stainless steel. The prepared blade slab has a maximum width of 2600mm, a maximum height of 2100mm, a maximum thickness of 220mm and a minimum thickness of 30mm.

[0033] First, a prefabricated slab is placed on the side of the crystallizer, the electrode is melted under the resistance heat of the liquid slag, and the liquid metal passes through the slag pool to form a molten metal pool. Under the action of the water-cooled mold, the liquid metal liquid It is solidified and fused with the prefabricated slab placed in the crystallizer in advance to form the curved blade slab required by the experiment.

[0034] ① Combined with the remaining cavity size of the crystallizer, prepare a conformal steel plate electrode with a filling ratio of 0.26; ② The ratio of the slag system selected is CaF 2 : 60%, Al 2 o 3 : 35%, CaO: 5% to form a te...

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Abstract

The invention provides an electroslag fusion process for manufacturing a blade slab having a large curved surface, and it is more particularly effectively in making a blade slab which has a big width-to-thickness ratio, a large difference between the thin and the thick edges and a large curved surface. Firstly, dividing the blade slab into two or three regions according to the external shape and the sectional size of the blade slab, wherein the region which has difficulty in unilateral or bilateral mold-filling is pre-fabricated by the electroslag casting technology to produce a pre-fabricated curved slab, and then it is placed in advance in a side of an internal cavity of a mold, and then fusing the molten metal melted from a consumable electrode and one or two electroslag pre-fabricated slabs which are placed in advance in the mold by utilizing the electroslag fusion process, so as to produce the blade slab having a large curved surface. The large curved blade slab prepared by the process of the present invention has good internal and surface qualities, which can improve material utilization rate, shorten the processing period and improve quality, and in particular, has high anti-fatigue performance, high crack resistance and extensibility performances. The process of the present invention is more suitable for producing large or very large curved blade slab castings having a width-to-thickness ratio >10 and a single weight over 10 tons.

Description

technical field [0001] The invention relates to a large aspect ratio curved surface casting manufacturing process, and in particular provides an electroslag fusion manufacturing method for a large curved blade slab. Background technique [0002] In the field of equipment manufacturing, various irregular wide and thick plate castings and forgings are often used, which are characterized by large aspect ratio and irregular cross-sectional shape. As one of the important basic components of high-end equipment, the quality requirements of this special-shaped plate casting are extremely strict. For example: the quality problem of blade castings of hydro-generator almost restricts the overall operation life of the hydro-turbine unit. [0003] At present, the methods for producing such castings and forgings at home and abroad mainly include: ordinary sand casting, forging and electroslag casting. [0004] (1) Affected by the limitations of the process itself, ordinary sand casting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D23/10B22D19/04
Inventor 娄延春熊云龙陈瑞王安国宋照伟王云霞
Owner SHENYANG RES INST OF FOUNDRY
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