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Preparation method of high temperature-resistant type precoated sand

A technology of high-temperature-resistant and coated sand, which is applied to casting molding equipment, casting molds, and cores. Effect

Inactive Publication Date: 2017-05-10
西峡县北雁铸造材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing high temperature resistant coated sand with good fluidity, long heat resistance time, and not easy to cause false core sand injection, sand sticking and veining in castings, so as to improve the high temperature resistance of coated sand performance, to solve casting problems such as poor core injection, sticky sand, and veins caused by poor fluidity of coated sand and short high-temperature heat-resistant time

Method used

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  • Preparation method of high temperature-resistant type precoated sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of the high temperature resistant type coated sand in the present embodiment comprises the following steps:

[0023] Step 1: Heat the original sand, add the original sand to the sand mixer when the sand temperature rises to 140-160°C, then add the binder and mix the sand for 20s-120s to obtain the binder sand, and wait for the binder to be completely melted Then add high temperature resistant additives and lubricants in turn, and continue stirring to make the additives and lubricants evenly dispersed in the binder;

[0024] Step 2: When the sand temperature drops to 90-110°C, add the curing agent and mix for 20-50s to obtain the curing agent sand;

[0025] Step 3: Add lubricant to the curing agent sand again and mix the sand for 20-120s. When the sand temperature drops to 70-80°C, add the lubricant again and mix for 10-30s to produce sand to obtain high temperature resistant coated sand.

[0026] Wherein, the added weight of the binder is 1.5% of...

Embodiment 2

[0032] The steps of preparing high temperature resistant coated sand are the same as those in Example 1, and the difference from Example 1 lies in the ratio of each raw material component, and the difference is as follows:

[0033] The added weight of the binder is 2.0% of the total weight of the original sand, the added weight of the high temperature additive is 25% of the added weight of the binder, the added weight of the curing agent is 15% of the added weight of the binder, and the total added weight of the lubricant is. The weight is 6% of the added weight of the binder.

[0034] The high temperature resistant additives include: one or more selected from graphite, magnesium hydroxide, aluminum hydroxide, antimony trioxide, zinc borate and triphenyl phosphate.

[0035] The specific choice of which high temperature resistant additive in graphite, magnesium hydroxide, aluminum hydroxide, antimony trioxide, zinc borate, and triphenyl phosphate should be determined according ...

Embodiment 3

[0039] The steps of preparing high temperature resistant coated sand are the same as those in Example 1, and the difference from Example 1 lies in the ratio of each raw material component, and the difference is as follows:

[0040] The added weight of the binder is 2.5% of the total weight of the original sand, the added weight of the high temperature resistant additive is 30% of the added weight of the binder, and the added weight of the curing agent is 20% of the added weight of the binder, The added weight of the lubricant is 6% of the added weight of the binder;

[0041] The high temperature resistant additives include: one or more selected from graphite, magnesium hydroxide, aluminum hydroxide, antimony trioxide, zinc borate and triphenyl phosphate.

[0042] The specific choice of which high temperature resistant additive in graphite, magnesium hydroxide, aluminum hydroxide, antimony trioxide, zinc borate, and triphenyl phosphate should be determined according to the actu...

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Abstract

The invention discloses a preparation method of a high temperature-resistant type precoated sand. The preparation method specifically comprises the following steps of 1, heating raw sand, adding the raw sand into a sand mixing machine after the sand temperature is increased to 140 to 160 DEG C, adding an adhesive, mixing the sand, and stirring for 20 to 120s, so as to obtain adhesive sand; after the adhesive is completely melted, sequentially adding high temperature-resistant additive and lubricant, continuing to stir, and uniformly dispersing the additive and the lubricant into the adhesive; 2, stopping heating, adding a curing agent after the sand temperature is decreased to 90 to 110 DEG C, and mixing for 20 to 50s, so as to obtain curing agent sand; 3, adding the lubricant into the curing agent sand, mixing the sand for 20 to 120s, adding the lubricant again after the sand temperature is decreased to 70 to 80 DEG C, mixing for 10 to 30s, and discharging sand, so as to obtain the high temperature-resistant type precoated sand. The high temperature-resistant type precoated sand prepared by the preparation method has the advantages that the fluidity is good, the high temperature heat-resistant time is long, the expansion rate is low, the anti-crack and anti-sand sticking effects are realized, and the like.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a preparation method of high temperature resistant type coated sand. Background technique [0002] Coated sand refers to the molding sand or core sand coated with a layer of solid resin on the surface of the sand particles before molding. Cast iron castings, non-ferrous metal castings, 3D printing and other casting fields are increasingly widely used. [0003] However, the current coated sand has shortcomings such as low high temperature resistance, poor fluidity, and short high temperature heat resistance time, which cannot meet the needs of existing production. SUMMARY OF THE INVENTION [0004] The purpose of the present invention is to provide a preparation method of high temperature resistant type coated sand with good fluidity, long heat resistance time, not easy to cause sand core sand shot not solid, casting sand sticking, and veining, so as to improve the h...

Claims

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Application Information

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IPC IPC(8): B22C1/02B22C1/22
CPCB22C1/02B22C1/22
Inventor 韩海涛韩冰韩继磊祁海军
Owner 西峡县北雁铸造材料有限公司
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