Shell filler assisting shell manufacture in investment casting and method filling shells by adopting filler

A technology of investment casting and filling material, which is applied in the field of casting modeling, can solve the problems of mold shell running out of fire, failure to get normal coating, high cost of prefabricated core, etc., achieve good fluidity and filling performance, and shorten the shell making cycle , Solve the effect of the shell running out of fire

Inactive Publication Date: 2013-02-20
CHONGQING JINGRUI CASTING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Disadvantages of the existing technology: due to the narrow inner cavity of the wax mold, the narrow opening will be blocked by paint and sand, and normal coating cannot be obtained. These shell defects will lead to i

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A shell filling material for auxiliary shell making in investment casting and a method for filling the shell with the filling material. Taking the investment casting silica sol shell making process to manufacture a steering valve body as an example, the steps are as follows:

[0030] (1) Preparation of filling materials for later use

[0031] The filler comprises the following components in parts by weight:

[0032] Ammonium dihydrogen phosphate: 12 parts;

[0033] Fused quartz: 78.496 parts;

[0034] Magnesium oxide: 9 parts;

[0035] Magnesium dihydrogen phosphate: 0.5 parts;

[0036] Silicone defoamer: 0.004 parts.

[0037] Grind the ammonium dihydrogen phosphate, magnesium oxide, fused quartz, organosilicon defoamer and magnesium dihydrogen phosphate first, the particle size of the fused quartz reaches 100 mesh, and then add them to the mixer according to the weight percentage of each component and mix Evenly, it is prepared into a filling material, and the pre...

Embodiment 2

[0051] A shell filling material for auxiliary shell making in investment casting and a method for filling the shell with the filling material. The nozzle castings used for industrial boilers in the investment casting water glass shell making process are selected as an example. The steps are as follows:

[0052] (1) Preparation of filling materials for later use

[0053] The filler comprises the following components in parts by weight:

[0054] Ammonium dihydrogen phosphate: 18 parts;

[0055] Fused quartz: 44.85 parts;

[0056] Quartz: 20;

[0057] Magnesium oxide: 12 parts;

[0058] Magnesium dihydrogen phosphate: 5 parts;

[0059] Silicone defoamer: 0.15 parts.

[0060] First grind the ammonium dihydrogen phosphate, magnesium oxide, quartz and fused quartz, organic silicon defoamer and magnesium dihydrogen phosphate until the particle size of the quartz and fused quartz reaches 100 mesh, and then add them according to the weight percentage of each component Mix evenly ...

Embodiment 3

[0074] A shell filling material for auxiliary shell making in investment casting and a method for filling the shell with the filling material. The investment casting water glass shell making process is selected as an example to manufacture a tank block casting, and the steps are as follows:

[0075] (1) Preparation of filling materials, for subsequent use

[0076] The filler comprises the following components in parts by weight:

[0077] Ammonium dihydrogen phosphate: 6.5 parts;

[0078] Quartz: 80.42 parts;

[0079] Magnesium oxide: 6 parts;

[0080] Magnesium dihydrogen phosphate: 7 parts;

[0081] Silicone defoamer: 0.08 parts.

[0082] First grind the ammonium dihydrogen phosphate, magnesium oxide, quartz, organosilicon defoamer and magnesium dihydrogen phosphate until the particle size of the quartz reaches 200 mesh, then add them into the mixer according to the weight percentage of each component and mix evenly. It is prepared as a filling material, and the prepared...

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PUM

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Abstract

The invention provides a shell filler assisting shell manufacture in investment casting and a method filling shells by adopting the filler. The shell filler is characterized by comprising the following components in parts by weight: ammonium dihydrogen phosphate 6-20, quartz and/or fused quartz: 58-83, magnesium oxide 5-18, monomagnesium phosphate: 0.3-8andorganic silicon defoamer: 0.002-0.3; and the method is characterized by comprising the steps of filling shells with the shell filler through operations including preparing shells to be filled, preparing size, pouring the size to fill the shells, solidifying, drying, then smearing and the like. The shell filler assisting shell manufacture in investment casting and the method filling shells by adopting the filler can resolve the problems of cast piece inner cavity shiming and shell runout during casting with low cost, and shorten shell manufacture period of silica solution shells with blind holes; and moreover, the shell filler further has the advantages of being good in mobility and filling performance and capable of self-solidification and the like.

Description

technical field [0001] The invention belongs to the field of casting modeling, and in particular relates to a shell filling material for auxiliary shell making in investment casting and a method for filling the shell with the filling material. Background technique [0002] It is understood that the existing method of forming complex internal cavities of metal castings is to set cores in the mold. [0003] The investment casting process is suitable for mass production of castings with complex inner cavities, because wax patterns with complex inner cavities can be manufactured efficiently by designing complex dies with core pulling. However, in investment casting, manufacturing a wax pattern with a complex cavity does not mean that a casting with a complex cavity can be produced. When the inner cavity of the wax mold is relatively narrow, usually only two layers of coating (paint and hanging sand) are applied, and only a relatively narrow and deep channel is left here. If you...

Claims

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Application Information

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IPC IPC(8): B22C3/00B22C9/04
Inventor 王世全闵小俊李从文
Owner CHONGQING JINGRUI CASTING MATERIAL
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