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Process for preparing large cast steel support roller

A preparation process and technology of back-up rolls, applied in the field of advanced preparation technology of cast steel back-up rolls, can solve the problems of scrapped roll castings, difficulty in removal, deep cracks, etc., achieve stable casting process, improve casting qualification rate, and enhance feeding capacity Effect

Active Publication Date: 2009-07-08
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
Comparison scheme
Effect test

Embodiment 1

[0031] 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:

[0032] 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.

[0033] 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 5mm.

[0034] 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.

[0035] 4) The sprue and runner are formed with refractory brick tubes.

[0036] The first pour was successfully completed. After 20 minutes of pouring, the sliding roll neck pad ...

Embodiment 2

[0038] 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:

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 4) The sprue and runner are formed with refractory brick tubes.

[0043] The second pour was successfully completed. The sliding...

Embodiment 3

[0045] 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:

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 4) The sprue and runner are formed with refractory brick tubes.

[0050] The third pouring was successfully completed. ...

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Abstract

The invention relates to a preparation process of a cast steel support roll. It is suitable for the overall casting process of cast steel support rolls with a net weight of 5 to 100 tons. The present invention is based on computer simulation, sand-covered iron mold, tangential inner gate rotary filling, thermal insulation riser technology, gating system design and casting mold design based on new gating system design principles and sequential solidification principles, etc. Electric heating riser technology and sliding roll neck technology are adopted. Electric heating riser technology is to conduct single-electrode or multi-electrode heating on the riser end of the roll to keep the metal liquid level at high temperature and increase the feeding capacity of the riser. The sliding roll neck technology is to install a sliding roll neck between the roll body and the upper roll neck, which is composed of a sliding roll neck inner sleeve and a sliding roll neck outer sleeve, and a cushion block is arranged between them. After pouring is completed for 5 to 30 minutes, the block is removed and the inner sleeve slides down to release the stress. The sliding roll neck technology and the electric heating riser technology adopted in the invention solve the crack problem of the cast steel backing roll.

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 Patents(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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