Cooling coating special for lost foam casting and preparation method of cooling coating

A technology of lost foam casting and coating, which is applied to casting molding equipment, coatings, casting molds, etc. It can solve the problems of high defect rate of products, and achieve the effects of suitable high temperature air permeability, scientific design, and good brushability

Active Publication Date: 2016-01-13
GAOYAO HONGXING PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, only starting from the above performance has not made a substantial breakthrough, and there is still a problem of high defect rate in the production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The special cooling coating for lost foam casting in this embodiment is made of the following raw materials in parts by weight: 25 parts of modified zircon powder, 10 parts of modified zeolite powder, 14 parts of modified attapulgite, 3 parts of modified bentonite, 20 parts of white oil, 12 parts of pumice sand, 7 parts of metakaolin, 3 parts of quicklime, 2 parts of PB2400 polyisobutylene, 2 parts of low polymerization polyvinyl alcohol, 3 parts of zinc chromate. The preparation method of the special cooling paint for lost foam casting is as follows: mix the above-mentioned raw materials evenly, add colloid mill to emulsify, and the gap between the colloid mill is 2 mm.

[0027] Described modified zircon powder is made by following steps:

[0028] (1) After sieving the zircon powder, wash it with water to remove floating dust and impurities on the surface until the pH of the washing liquid is 7-8;

[0029] (2) Mix the obtained zircon powder and phosphoric acid solutio...

Embodiment 2

[0039] The special cooling coating for lost foam casting in this embodiment is made of the following raw materials in parts by weight: 20 parts of modified zircon powder, 12 parts of modified zeolite powder, 12 parts of modified attapulgite, 4 parts of modified bentonite, 18 parts of white oil, 15 parts of pumice sand, 6 parts of metakaolin, 4 parts of quicklime, 1 part of PB2300 polyisobutylene, 3 parts of low-polymerization polyvinyl alcohol, and 2 parts of zinc chromate.

[0040] Its preparation method and each modified raw material preparation method are identical with embodiment 1.

[0041] The test method was the same as that in Example 1: the defective rate of the control group was 14‰, and the defective rate of the observation group was 2‰.

Embodiment 3

[0043] The special cooling paint for lost foam casting in this embodiment is made of the following raw materials in parts by weight: 30 parts of modified zircon powder, 9 parts of modified zeolite powder, 15 parts of modified attapulgite, 2 parts of modified bentonite, 21 parts of white oil, 7 parts of pumice sand, 8 parts of metakaolin, 2 parts of quicklime, 3 parts of PB2400 polyisobutylene, 1 part of low degree of polymerization polyvinyl alcohol, 4 parts of zinc chromate.

[0044] Its preparation method and each modified raw material preparation method are identical with embodiment 1.

[0045] The test method was the same as in Example 1: the defective rate of the control group was 14‰, and the defective rate of the observation group was 4‰.

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Abstract

The invention belongs to the technical field of casting, and particularly relates to a cooling coating special for lost foam casting and a preparing method of the cooling coating. The cooling coating is prepared from, by weight, 20-30 parts of modified zircon powder, 9-12 parts of modified zeolite powder, 12-15 parts of modified attapulgite, 2-4 parts of modified bentonite, 18-21 parts of white oil, 7-15 parts of pumice sand, 6-8 parts of metakaolin, 2-4 parts of quick lime, 1-3 parts of polyisobutene, 1-3 parts of polyving akohol and 2-4 parts of zinc chromate. The cooling coating is good in invasion and painting performance and moderate in high-temperature permeability, especially, the heat transferring speed is high, the outer surface of the part, with slow cooling, of a lost foam body is coated with the cooling coating so that the cooling speed of molten metal in the remaining position can be increased, the temperature of a casting is reduced in a uniform manner, and the reject ratio of products is reduced obviously.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a special cooling coating for lost foam casting and a preparation method thereof. Background technique [0002] Lost foam casting, also known as solid mold casting, is to bond and combine paraffin or foam models similar in size and shape to castings to form a model cluster. After brushing refractory paint and drying, it is buried in dry quartz sand for vibration molding. Down pouring, the model is vaporized, the liquid metal occupies the position of the model, solidified and cooled to form a new casting method. Lost foam casting technology has many advantages such as high casting precision, flexible design, no traditional sand core, clean production, and low cost. Therefore, it has developed rapidly all over the world in the past 20 years. [0003] The coating in the lost foam casting technology is one of its key technologies, and the performance of the coating direc...

Claims

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Application Information

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IPC IPC(8): B22C3/00
Inventor 刘建锋
Owner GAOYAO HONGXING PRECISION CASTING
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