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Composite heating thermal-insulating pressing riser bush

A technology for pressurizing risers and riser sleeves, applied in the field of riser sleeves for casting, can solve the problems of shrinkage, shrinkage porosity, casting dispersion, etc., and achieve the effects of improving density, low cost and strong applicability

Inactive Publication Date: 2007-01-31
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for steel castings and non-ferrous alloy castings with a wide solidification area, since the solidification method is mostly mushy solidification, the developed coarse dendrites formed by the initial solidification of the casting after pouring tend to divide the unsolidified alloy liquid into one A small molten pool that is not connected to each other, the feeding channel is blocked, so it is difficult for the molten metal in the riser to feed, and it is easy to cause many scattered shrinkage porosity and shrinkage cavity defects in the casting.

Method used

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  • Composite heating thermal-insulating pressing riser bush
  • Composite heating thermal-insulating pressing riser bush
  • Composite heating thermal-insulating pressing riser bush

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 Shown is a schematic diagram of the structure of the present invention: 1 riser cover, 2 heat insulating material, 3 heating block, 4 hook. The main feature is that a hook 4 is fixed at the center of the top of the riser sleeve 1, and the heating and gas generating block 3 is fixed in the riser sleeve through the hook 4.

[0022] The thermal insulation material 2 is composed of hollow microsphere powder, fly ash, perlite, bentonite and water glass.

[0023] The heating and gas generating block 3 is formed by pressing the heating material aluminum powder, the oxygen supply material iron concentrate powder, the ignition material sodium nitrate, the reaction activation material sodium fluoride and the binding agent, and the volume of the heating and gas generating block can be as required. Varies for feeding castings.

Embodiment 2

[0025] Such as figure 2 As shown, it is another structural schematic diagram of the present invention: 1 riser sleeve, 2 insulation material, 3 heating and gas generating block, 5 through hole. The inner wall of the riser sleeve 1 is provided with two opposite through holes 5 , and the heating and gas generating block 3 is fixed on the two through holes 5 .

[0026] The material composition of the heat-insulating material 2 and the heat-generating and gas-generating block 3 is basically the same as that of Example 1.

Embodiment 3

[0028] Such as image 3 As shown, it is another structural schematic diagram of the present invention: 1 riser cover, 2 insulation material, 3 heating and gas generating block, 6 pins. The inner wall of the riser sleeve 1 is provided with two opposite pins 6 , and the heating and gas generating block 3 is fixed on the inner wall of the riser sleeve by the pins 6 .

[0029] The material composition of the heat-insulating material 2 and the heat-generating and gas-generating block 3 is basically the same as that of Example 1.

[0030] Riser category

[0031] The results of this test show that: compared with common heat-preserving and pressurized riser sleeves on the market, the solidification time of the riser sleeves of Embodiment 1, Embodiment 2, and Embodiment 3 of the present invention is respectively prolonged by 21.3%, 20.4%, and 22.1%. The feeding efficiency increased by 36.4%, 34.5%, and 38.2%, respectively, and the shrinkage porosity and shrinkage defect rate...

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Abstract

A composite riser head cover with heating, insulating and pressurizing function for the castings difficult for feeding features that it has an internal heat-and gas-generating block made of the heat-and gas-generating agent, which can generate heat and expansive gas under the action of high temp of molten metal to make the molten pass through feeding channel smoothly.

Description

(1) Technical field [0001] The invention relates to a riser sleeve for casting, in particular to a composite heat preservation and pressurization riser sleeve used for ductile iron, cast steel and other difficult-to-feed castings. (2) Background technology [0002] In the solidification and shrinkage stage of cast steel, ductile iron, gray iron and non-ferrous metals, if ordinary risers are used for feeding, the required riser volume is large, the consumption of molten metal is large, and the utilization rate is low, only reaching about 14%. , and the feeding effect is not good. In order to improve the metal utilization rate and reduce the production cost, most of the current casting production, especially the production of steel castings, adopts special thermal insulation riser sleeves to improve the feeding effect. [0003] The thermal insulation riser sleeve is to reduce the heat loss of the molten metal in the riser through the thermal insulation effect of the thermal i...

Claims

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Application Information

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IPC IPC(8): B22D7/10
Inventor 祝建勋李金锋
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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