Mold casting method

A mold and casting technology, applied in the field of casting, to achieve the effects of good air permeability, high dimensional accuracy, and good coating and hanging properties

Inactive Publication Date: 2016-02-10
广西博白县三田机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the action of negative pressure, liquid metal can easily penetrate into the gap between dry sand and form mechanical sticky sand.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A mold casting method, comprising the steps of:

[0039] 1) Process the foam board into a foam model;

[0040] 2) Apply refractory coating on the surface of the foam model;

[0041] 3) Dry the foam model coated with refractory coating;

[0042] 4) Embed the foam model in step 3) in the molding sand for vibration modeling;

[0043] 5) Pouring fluid metal under negative pressure to vaporize the foam model;

[0044] 6) After the casting model in step 5) is cooled, the casting inside the sand box is separated from the dry sand to obtain the mold casting;

[0045] Step 2) The refractory coating is composed of the following raw materials: bauxite 4kg, quartz powder 3kg, corundum 1kg, diatomite 1kg, talcum powder 1kg, cryolite 0.1kg, CMC 0.8kg, polyvinyl alcohol 0.3kg, water glass 0.3kg, sodium phosphate 0.1kg. The preparation method is that water is used as a carrier, and all raw materials are mixed evenly in proportion.

[0046] The specific method of molding in step 4...

Embodiment 2

[0049] A mold casting method, comprising the steps of:

[0050] 1) Process the foam board into a foam model;

[0051] 2) Apply refractory coating on the surface of the foam model;

[0052] 3) Dry the foam model coated with refractory coating;

[0053] 4) Embed the foam model in step 3) in the molding sand for vibration modeling;

[0054] 5) Pouring fluid metal under negative pressure to vaporize the foam model;

[0055] 6) After the casting model in step 5) is cooled, the casting inside the sand box is separated from the dry sand to obtain the mold casting;

[0056] Step 2) The refractory coating is composed of the following raw materials: bauxite 6kg, quartz powder 1kg, corundum 0.5kg, diatomaceous earth 0.5kg, talcum powder 0.5kg, cryolite 0.3kg, CMC 0.3kg, Polyvinyl alcohol 0.1kg, water glass 0.8kg, sodium phosphate 0.3kg. The preparation method is that water is used as a carrier, and all raw materials are mixed evenly in proportion.

[0057] The specific method of mo...

Embodiment 3

[0060] A mold casting method, comprising the steps of:

[0061] 1) Process the foam board into a foam model;

[0062] 2) Apply refractory coating on the surface of the foam model;

[0063] 3) Dry the foam model coated with refractory coating;

[0064] 4) Embed the foam model in step 3) in the molding sand for vibration molding;

[0065]5) Pouring fluid metal under negative pressure to vaporize the foam model;

[0066] 6) After the casting model in step 5) is cooled, the casting inside the sand box is separated from the dry sand to obtain the mold casting;

[0067] Step 2) The refractory coating is composed of the following raw materials: bauxite 4.5kg, quartz powder 2.5kg, corundum 0.8kg, diatomaceous earth 0.6kg, talcum powder 0.8kg, cryolite 0.1kg, CMC0. 4kg, polyvinyl alcohol 0.1kg, water glass 0.6kg, sodium phosphate 0.1kg, fatty alcohol polyoxyethylene ether 0.02kg. The preparation method is that water is used as a carrier, and all raw materials are mixed evenly in p...

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Abstract

The invention relates to a mold casting method. The mold casting method comprises the following steps that 1 a foam plate is machined into a foam model; 2 a fire-proof coating is smeared on the surface of the foam model; 3 the foam model smeared with the fire-proof coating is dried; 4 the foam model in the step 3 is buried in molding sand for vibration molding; 5 liquid metal is poured at negative pressure so that the foam model can be gasified; and 6 when the poured model in the step 5 is cooled, a casting inside a sand box is separated from dry sand, and a mold casting is obtained. The fire-proof coating in the step 2 is composed of the following raw materials of bauxite, quartz powder, corundum powder, kieselguhr, talcum powder, cryolite, carboxymethyl cellulose (CMC), polyvinyl alcohol, water glass and sodium phosphate. The mold casting method is suitable for lost foam casting, sand burning is not prone to occur, and an obtained mold is high in size precision and has a bright and clean surface.

Description

technical field [0001] The invention relates to the field of casting, in particular to a mold casting method. Background technique [0002] Mold casting is a part of casting tooling, and it is the necessary equipment to shape the casting and obtain the required casting. Lost foam casting, also known as solid casting, is to bond and combine paraffin or foam models similar in size and shape to castings to form a model cluster. After brushing with refractory paint and drying, it is buried in dry sand for vibration modeling, and poured under negative pressure. , the model is vaporized, the liquid metal occupies the position of the model, solidified and cooled to form a new casting method of castings. It has the following advantages: [0003] 1. High casting precision [0004] Lost Foam Casting is a new technology with nearly no allowance and precise molding. This technology does not need to take molds, has no parting surface, and no sand core, so the casting has no flash, bur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C3/00
Inventor 陈杰陈智强凌丽英陈勇
Owner 广西博白县三田机械制造有限公司
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