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Cast ingot manufacturing device and method

A technology for manufacturing equipment and ingots, which is applied in the field of preparing high-quality ingots, can solve the problems of low efficiency and high cost, and achieve the effect of wide sources, low cost and wide selection range

Inactive Publication Date: 2020-04-03
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above special metallurgical methods provide effective means for the development of high-performance materials, but most of them have problems such as high cost and low efficiency

Method used

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  • Cast ingot manufacturing device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]Taking GCr15 bearing steel as an example, evenly mix sponge iron powder, high-purity recarburizer, high-carbon ferrochrome powder, a small amount of ferrosilicon, ferromanganese powder and slag to ensure that the raw material composition meets the requirements of GCr15 bearing steel composition, and the slag agent accounts for 2-10% of the total mass, granulated and dried for later use; put a small amount of GCr15 bearing steel scrap steel and mold slag in the cold crucible 3, and pass the protective slag into the cold crucible 3 covered with the sealing layer 4 through the air inlet 2 Gas, start the induction heater 7 to heat, after the GCr15 bearing steel scrap is heated and melted, the induction heater 7 is clamped by the clamping device to move upward at a constant speed, and the feeding mechanism sends the raw materials into the molten pool. As the molten pool continues to rise, The lower part of the melt continues to solidify and eventually forms a complete ingot. ...

Embodiment 2

[0041] 304 stainless steel ingot manufacturing plan, 304 stainless steel scrap (steel shavings, blanking waste, etc.) is degreased, crushed, mixed, ball-pressed and other processes to form uniform particles or balls and other furnace materials, which are dried and used for later use; before smelting A certain amount of 304 stainless steel scrap steel and protective slag are put into the cold crucible 3, and the protective gas is introduced, and the induction heater 7 is started to heat. After the material is melted, the aforementioned prepared charge is added, and the induction heater is clamped by the clamping device 7 moves upward at a constant speed, and the charging speed is controlled by the temperature sensor 11 to keep the smelting process stable. After the induction coil reaches the top of the crucible, remove the coil after a period of heat preservation, open the crucible, and take out the ingot. The obtained ingot is tested, and it is found that the non-metallic incl...

Embodiment 3

[0043] 201 stainless steel ingot manufacturing plan, the 201 stainless steel scrap (steel scrap, blanking waste, etc.) is degreased, crushed, mixed, ball-pressed and other processes to form uniform particles or pellets and other furnace materials, which are dried and used for later use; A certain amount of 201 stainless steel scrap steel and protective slag are put into the cold crucible 3, and the protective gas is introduced, and the induction heater 7 is started for heating. Moving upward at a uniform speed, the charging speed is controlled by the temperature sensor 11 to keep the melting process stable. After the induction coil reaches the top of the crucible, remove the coil after a period of heat preservation, open the crucible, and take out the ingot. The obtained ingot is tested, and it is found that the non-metallic inclusions are less than grade 2, the surface is smooth, there is no obvious visible defect, the internal structure is dense, no shrinkage cavity, loose, ...

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Abstract

The invention relates to a cast ingot manufacturing device and method. The device comprises a cold crucible (3), an induction heater (7), a feeding device (1) and a temperature sensor (11), wherein the induction heater (7) is arranged on the outer side of the cold crucible (3) and can move up and down along the side wall of the cold crucible (3), the feeding device is arranged at the upper part ofthe cold crucible (3) and is used for adding raw materials into the cold crucible (3), and the temperature sensor (11) is positioned at the top of the cold crucible (3) and is used for measuring thetemperature of a molten pool in the cold crucible (3). In the smelting process, powder or granular raw materials serve as smelting base materials, melting is conducted through induction heating, afterthe initial furnace charge is molten, an induction coil is lifted upwards at a constant speed, the furnace charge is evenly or intermittently added at the same time, the feeding speed is regulated and controlled through infrared temperature measurement, and finally a cast ingot which is small in segregation, high in cleanliness and good in surface quality is obtained. Compared with the prior art,the device has the characteristics of high production efficiency, low equipment investment and operation cost, high safety coefficient, environmental friendliness and the like.

Description

technical field [0001] The invention relates to a metallurgical equipment and process, in particular to equipment and methods for preparing high-quality ingots. Background technique [0002] Most materials undergo a liquid-solid transformation process to form an ingot before forming, and then make various shapes through rolling, forging, heat treatment, etc. The quality of the ingot is directly related to the quality and performance of the material. Casting defects such as segregation, inclusions, and uneven grains are difficult to remove during subsequent processing. Taking steel as an example, most steel products are currently produced in the form of continuous casting, but for some small batches or large-size and special steel ingots that are not suitable for continuous casting, they still need to be produced by die casting. The treated molten steel is directly poured into the ingot mold through the tundish, and the molten steel solidifies freely from the surface to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D23/06
CPCB22D23/06
Inventor 张卫李建国
Owner SHANGHAI JIAO TONG UNIV
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