Cast steel exothermic riser sleeve

A heating riser and steel casting technology, which is applied in the field of casting riser sleeves, can solve the problems of easy expansion of thermal insulation material vermiculite, complex structure of thermal insulation riser sleeves, uneven heat transfer, etc., and achieve high refractoriness and prolonged solidification time , good thermal insulation effect

Active Publication Date: 2017-02-22
西峡飞龙特种铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat preservation riser sleeve of this patent has a complex structure, high manufacturing cost, uneven heating, and poor heat preservation effect.
[0004] Chinese patent CN103551512B discloses a heating riser sleeve and its preparation method, which solves the problems of poor heat preservation, insufficient heat generation and single function of existing heating and heat preservation riser sleeves
However, the amount of heating material in the above-mentioned patent is large, the heating speed is fast, the heat transfer is uneven, and the thermal insulation material vermiculite is easy to expand at high temperature, resulting in deformation of the heating riser sleeve

Method used

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  • Cast steel exothermic riser sleeve
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Examples

Experimental program
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Effect test

Embodiment 1

[0029] see figure 1 and figure 2 , a cast steel heating riser sleeve 1, both ends of the heating riser sleeve 1 are open, the top of the heating riser sleeve 1 is provided with a top cover 2, and the top cover 2 is made of coated sand .

[0030] The particle size of the coated sand is 40 mesh.

[0031] The raw material composition of the heating riser cover 1 is: by weight percentage,

[0032] Chromite sand 24%, hollow microspheres 13%, attapulgite clay 20%, aluminum powder 15%, ferric oxide powder 13%, graphite powder 5%, magnesium powder 3%, sodium nitrate 4%, potassium chloride 3%, plus 10% water glass and 15% water of the total weight of raw materials.

[0033] The particle size of the chromite sand is 70 mesh, Cr 2 o 3 Content ≥ 45%.

[0034] The diameter of the hollow microspheres is 100 μm.

[0035] The attapulgite clay is fibrous, and the single crystal is 50nm long and 10nm in diameter.

[0036] The particle sizes of the aluminum powder, ferric oxide powder,...

Embodiment 2

[0041] The structure and preparation method of the cast steel heating riser sleeve in this embodiment are the same as those of the cast steel heating riser sleeve in Example 1, and will not be repeated. Some differences are:

[0042] The particle size of the coated sand is 30 mesh.

[0043] The raw material composition of the heating riser cover is: by weight percentage, 25% of chromite sand, 12% of hollow microspheres, 18% of attapulgite clay, 15% of aluminum powder, 10% of ferric oxide powder, graphite powder 8%, magnesium powder 2%, sodium nitrate 6%, potassium chloride 4%, plus 11% water glass and 16% water of the total weight of raw materials.

[0044] The particle size of the chromite sand is 80 mesh, Cr 2 o 3 Content ≥ 45%.

[0045] The diameter of the hollow microspheres is 120 μm.

[0046] The attapulgite clay is fibrous, with a single crystal length of 80 nm and a diameter of 15 nm.

[0047]The particle size of the aluminum powder, ferric oxide powder, graphite ...

Embodiment 3

[0050] The structure and preparation method of the cast steel heating riser sleeve in this embodiment are the same as those of the cast steel heating riser sleeve in Example 1, and will not be repeated. Some differences are:

[0051] The particle size of the coated sand is 30 mesh.

[0052] The raw material composition of the heating riser cover is: by weight percentage, 26% of chromite sand, 13% of hollow microspheres, 17% of attapulgite clay, 20% of aluminum powder, 11% of ferric oxide powder, graphite powder 7%, magnesium powder 1%, sodium nitrate 3%, potassium chloride 2%, plus 12% water glass and 17% water of the total weight of raw materials.

[0053] The particle size of the chromite sand is 100 mesh, Cr 2 o 3 Content ≥ 45%.

[0054] The diameter of the hollow microspheres is 150 μm.

[0055] The attapulgite clay is fibrous, and the single crystal is 100nm long and 20nm in diameter.

[0056] The particle sizes of the aluminum powder, ferric oxide powder, graphite p...

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Abstract

The invention relates to a casting riser sleeve, in particular to a cast steel exothermic riser sleeve. The two ends of the exothermic riser sleeve are opened. A top cover is arranged at the top end of the exothermic riser sleeve. The top cover is made of precoated sand. The exothermic riser sleeve is adopted for replacing a sand mold overflow riser in the prior art, the setting time is prolonged, heat supply is uniform, and the interior of an exothermic riser is free of defects, deformation and expansion; and the surface of a casting is bright and clean, the appearance is tidy, the technology yield is increased by 4.6%, and the production cost is reduced.

Description

technical field [0001] The invention relates to a casting riser sleeve, in particular to a cast steel heating riser sleeve. Background technique [0002] Cast steel is a general term for iron-based alloys used to produce castings that do not undergo eutectic transformation during solidification. Since the shrinkage of cast steel is much higher than that of cast iron, in order to prevent shrinkage cavities and shrinkage defects in castings, measures such as risers, cold iron and subsidies are mostly used in the casting process to achieve sequential solidification. Every heat section of the casting must be provided with a riser, and the conventional sand overflow riser process has a low yield rate. Therefore, it is of great significance to develop a heating riser that can improve the process yield. [0003] Chinese patent CN2905267Y discloses a composite thermal insulation and heating riser sleeve structure, including a thermal insulation riser sleeve and a heating element, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/08B22C1/02
CPCB22C1/02B22C9/088
Inventor 刘松奇余嗣瑞闫国福李世一齐小军李可丹李刚王爱丽
Owner 西峡飞龙特种铸造有限公司
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