Process for preparing large cast steel support roller

A preparation process and a technology for back-up rolls, which are applied in the field of advanced preparation technology for cast steel back-up rolls, can solve the problems of scrapped roll castings, deep crack depths, and difficult removal, etc., to stabilize the casting process, enhance the feeding ability, and improve the qualified rate of castings Effect

Active Publication Date: 2007-04-11
CHANGSHU LONGTENG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cracks are deep and difficult to remove, often making roll castings scrapped

Method used

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  • Process for preparing large cast steel support roller

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Experimental program
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Effect test

Embodiment 1

[0030] The material of the present embodiment is 40Cr4, the weight of pouring molten metal is 44 tons, and the pouring speed is 8 tons per minute. Its casting process is as follows:

[0031] 1) The tangential ingate rotary pouring technology is adopted, and the sprue cup and pouring system are designed according to the principle of smooth filling.

[0032] 2) The sliding roll neck technology is adopted, and the gap between the sliding roll neck outer cover 5 and the sliding roll neck inner cover 7 is 5 mm.

[0033] 3) The electric heating riser is used, the diameter of the riser is 900mm, and the electroslag is Al 2 o 3 , CaO and CaF 2 A mixture of, by weight, Al 2 o 3 40%, CaO 10%, CaF 2 50%. The current is 800A, the voltage is 125V, the heating power is 100kw, and the heating time is 11h.

[0034] 4) The sprue and runner are formed with refractory brick tubes.

[0035] The first pour was successfully completed. After 20 minutes of pouring, the sliding roll neck pad...

Embodiment 2

[0037]The material of this embodiment is 40Cr4, the weight of pouring molten metal is 46 tons, and the pouring speed is 10 tons per minute. Its casting process is as follows:

[0038] 1) The tangential inner gate rotary pouring technology is still used, and the sprue cup and pouring system are designed according to the principle of smooth filling.

[0039] 2) The sliding roll neck technology is adopted, and the gap between the outer wall of the sliding roll neck inner sleeve 7 and the inner wall of the sliding roll neck outer sleeve 5 is 10 mm.

[0040] 3) The electric heating riser is adopted, the diameter of the riser is 950mm, and the electroslag is Al 2 o 3 , CaO and CaF 2 A mixture of, by weight, Al 2 o 3 50%, CaO 15%, CaF 2 35%. The current is 700A, the voltage is 100V, the heating power is 70kw, and the heating time is 12h.

[0041] 4) The sprue and runner are formed with refractory brick tubes.

[0042] The second pour was successfully completed. The sliding ...

Embodiment 3

[0044] The material of the present embodiment is 40Cr4, the weight of pouring molten metal is 45 tons, and the pouring speed is 9 tons per minute. Its casting process is as follows:

[0045] 1) The tangential ingate rotary pouring technology is still used, and the sprue cup and pouring system are designed according to the principle of smooth filling.

[0046] 2) The sliding roll neck technology is adopted, and the gap between the outer wall of the sliding roll neck inner sleeve 7 and the inner wall of the sliding roll neck outer sleeve 5 is 8mm.

[0047] 3) The electric heating riser is used, the diameter of the riser is 1000mm, and the electroslag is Al 2 o 3 , CaO and CaF 2 A mixture of, by weight, Al 2 o 3 70%, CaO 10%, CaF 2 20%. The current is 1000A, the voltage is 150V, the electric heating power is 150kw, and the heating time is 10h.

[0048] 4) The sprue and runner are formed with refractory brick tubes.

[0049] The third pouring was successfully completed. ...

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Abstract

The process of making cast steel supported roller is suitable for integral casting of cast steel supported roller of 5-100 ton weight. The present invention has adopts computer simulation, coating iron mold with sand, rotary cavity filling, heat insulating casting head technology, electrically casting head heating technology and sliding roller neck technology; and designs pouring system and casting mold design by means of new design principle and successive solidification principle. Adopting sliding roller neck technology and electrically casting head heating technology can avoid cracking in the cast steel supported roller.

Description

technical field [0001] The invention relates to an integral casting process of a large cast steel support roll, in particular to an advanced preparation process of a cast steel support roll. It is suitable for the integral casting process of 5-100t cast steel backup rolls. Background technique [0002] The output of rolled steel continues to increase, and the consumption of rolls is increasing day by day, especially the supply of large rolls is in short supply. The countries that can produce large rolls in the world now mainly include a few countries such as the United States, Germany, Japan, the United Kingdom, and South Korea. The technology of producing casting rolls varies from country to country. The United States adopts slow pouring technology, Germany mainly adopts flushing pouring method, Japan adopts integral pouring electric heating riser technology, and South Korea adopts electric heating insulation riser technology. [0003] The continuous improvement of the ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/04B22D23/10B22D25/00
Inventor 李殿中康秀红夏立军柯伟李依依
Owner CHANGSHU LONGTENG SPECIAL STEEL
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