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Heating thermal-insulating riser used for nodular cast iron, and preparation method thereof

A heat preservation riser and nodular cast iron technology, which is applied to casting molding equipment, casting molds, and casting mold components, can solve problems such as high raw material costs, insufficient heat generation, and inappropriate composition ratios, and achieve stable chemical properties and easy sources Acquisition, low-cost effect

Active Publication Date: 2018-11-02
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heating agent of domestic heating and heat preservation risers is incompletely burned, and the heating capacity is not fully exerted; it is often accompanied by a large amount of heat loss, and the situation of inappropriate component distribution occurs from time to time
[0006] (2) When the riser is pouring, it is easy to generate gas, and it cannot be discharged in time. The puff phenomenon often occurs, and personal accidents are prone to occur during the process.
[0007] (3) The production cost of heating and heat preservation riser is high
In comparison, the raw material cost of high thermite heating materials is much higher than that of old-fashioned riser insulation materials, which hinders its mass production
[0008] (4) There are not many manufacturers of riser development and research, and the number of products is small, which cannot meet such a large supply demand in the market
[0009] It can be seen that the current commercial heating and heat preservation risers often fail to meet the production requirements due to the shortcomings of poor heat preservation and insufficient heat generation. Therefore, it is necessary to improve the composition design of the existing heat and heat preservation risers

Method used

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  • Heating thermal-insulating riser used for nodular cast iron, and preparation method thereof
  • Heating thermal-insulating riser used for nodular cast iron, and preparation method thereof
  • Heating thermal-insulating riser used for nodular cast iron, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A method for preparing a heat-insulating riser for ductile iron, comprising the steps of:

[0062] (1) each raw material is crushed and then dried, and then each raw material is weighed according to the proportion of component A, then mixed with component B evenly, bonded, placed in a mold to form, and the riser blank is obtained; said A, The specific content of component B is shown in Table 3, which are respectively recorded as groups A-F. The bottom plate is 180mm long, 140mm wide, and the symmetrical pin spacing is 122mm; the long side of the central elliptical cylinder is 77mm, and the short side is 52.5mm; the two petals are 142mm long and 74mm wide.

[0063] In step (1), the method of described mixing is:

[0064] 1) First, the water glass with a Baume degree of 50° is diluted to 50%, and the water glass is equally divided into two parts for later use;

[0065] 2) Mix the floating beads with a portion of water glass diluted in step (1), so that the surface of th...

Embodiment 2

[0078] A method for preparing a heating and heat preservation riser for ductile iron, the same as in Example 1, the difference is that in step (1), by mass percentage, the A component is composed of the following components: 20% aluminum powder, graphite powder 14.5%, iron oxide powder 6%, potassium salt 4%, manganese dioxide 0.5%, floating beads 45%, sodium fluoroaluminate 5%, silica sand 5%; the B component is water glass, the water glass The content is 17% of the total weight of component A. In step (2), carbon dioxide gas is introduced to self-harden the formed riser blank.

Embodiment 3

[0080] A method for preparing a heating and heat preservation riser for ductile iron, the same as in Example 1, the difference is that in step (1), by mass percentage, the A component is composed of the following components: 20% aluminum powder, graphite powder 14.5%, iron oxide powder 12%, potassium salt 8%, manganese dioxide 0.5%, floating beads 40%, sodium fluoroaluminate 3%, silica sand 2%; the B component is water glass, the water glass The content is 14% of the total weight of component A. The drying time in step (2) is 3h.

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Abstract

The invention relates to a heating thermal-insulating riser used for nodular cast iron, and belongs to the technical field of casting riser preparation. The heating thermal-insulating riser used for nodular cast iron comprises an A component and a B component; the A component is composed of 20 to 30% of aluminium powder, 10 to 18% of graphite powder, 6 to 12% of iron oxide powder, 4 to 8% of a potassium salt, 0.5 to 2% of manganese dioxide, 40 to 45% of floating bead, 3 to 5% of sodium fluoroaluminate, and 2 to 5% of silica sand; the B component is water glass, the weight amount of water glassaccounts for 14 to 17% of the total weight amount of the A component. The heating and thermal insulating performance of the heating thermal-insulating riser is better than that of commercially available rises, the amount of molten iron used for shrinkage complement is reduced, cost is reduced; the performance of casted members prepared using the heating thermal-insulating riser is obviously better than that of conventional casting members, and casting member casting quality is increased effectively.

Description

technical field [0001] The invention relates to the technical field of preparation of casting risers, in particular to a heat-insulating riser for ductile iron and a preparation method thereof. Background technique [0002] In the casting production process, shrinkage cavity and shrinkage porosity are common defects, which will bring many problems to castings and reduce the performance of castings. Therefore, in actual casting, risers are usually used for feeding. At present, there are mainly two ways to improve the performance of the riser: one is to inhibit the rapid solidification of molten metal, that is, to make the riser have a thermal insulation effect; the other is to artificially create a chemical reaction and use the released heat to slow down the solidification speed of molten metal. [0003] After the molten metal is poured into the riser, at high temperature, the heat-generating material undergoes oxidation-reduction reaction and releases a large amount of heat...

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 张琳马仁殿张珺彦于化顺刘娜
Owner SHANDONG UNIV
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