Sand-burning-resistant water-based expendable pattern coating for gray iron casting and application and preparation method thereof

A lost foam and coating technology, which is applied to casting molding equipment, coatings, casting molds, etc., can solve the problems of unsatisfactory heat resistance, sticky sand, pores, impurities, and long post-treatment process time, and achieve the appearance quality Good, fast drying, good sintering effect

Active Publication Date: 2021-01-29
四川省宜宾普什集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lost foam coating is especially important for the quality of castings, especially for thick, complex and deep cavity parts. Due to high casting temperature and slow cooling, phenomena such as sticky sand, pores and impurities often occur, which may lead to long post-processing process time. , the dimensional accuracy of the workpiece is affected, the processing cost is high, etc., which will lead to the scrapping of the workpiece
[0003] It can be seen that the existing lost foam coatings still need to be improved, and their heat resistance has not yet reached the ideal level. Therefore, for the particularity of thick and large gray iron castings, the lost foam coatings should be specially designed

Method used

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  • Sand-burning-resistant water-based expendable pattern coating for gray iron casting and application and preparation method thereof
  • Sand-burning-resistant water-based expendable pattern coating for gray iron casting and application and preparation method thereof
  • Sand-burning-resistant water-based expendable pattern coating for gray iron casting and application and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] This embodiment discloses a lost foam coating to improve the precision and quality of casting and avoid the above-mentioned technical problems in view of the phenomena such as sticky sand, pores and impurities that are prone to occur in the gray iron casting process.

[0060] Specifically, a gray iron casting anti-sand sticking water-based lost foam coating disclosed in this embodiment includes the following components in terms of mass:

[0061] 30-40 parts of 100-mesh flake graphite with 90% carbon content, 80-90 parts of 200-mesh mullite, 3-9 parts of light-burned magnesium oxide, 3-5 parts of sodium bentonite, and 10% PVA concentration 9 to 19 parts of glue, 22 to 26 parts of alkaline silica sol with an active ingredient ratio of 30%, 6 to 8 parts of aluminum dihydrogen phosphate, 1 to 3 parts of redispersible white rubber powder, and an active ingredient ratio of 48% 7-10 parts of styrene-acrylic emulsion, 0.3-0.6 parts of JFC penetrant, and 100-160 parts of water. ...

Embodiment 2

[0064] In this example, the formulation of the lost foam coating disclosed in Example 1 is refined, and the following specific and feasible scheme is adopted, which includes the following components in terms of mass:

[0065] 36 parts of 100-mesh flake graphite with 90% carbon content, 84 parts of 200-mesh M45 mullite, 5 parts of light-burned magnesia, 3.2 parts of sodium bentonite, 10 parts of PVA thick gum with an active ingredient ratio of 10%, the ratio of active ingredients 24 parts of 30% alkaline silica sol, 7.2 parts of aluminum dihydrogen phosphate, 2.4 parts of redispersible white rubber powder, 9.6 parts of styrene-acrylic emulsion with an active ingredient ratio of 48%, 0.5 parts of JFC penetrant, and 0.5 parts of washing powder part, 100 parts of water.

[0066] In this embodiment, washing powder is added, and washing powder is used as a surfactant.

[0067] According to the lost foam coating disclosed in this example, the test pouring experiment is carried out. ...

Embodiment 3

[0074] This embodiment refines the formulation of the lost foam coating disclosed in Example 1, adopts the following specific and feasible scheme, and includes the following components in terms of mass:

[0075] 36 parts of 100 mesh flake graphite with 90% carbon content, 84 parts of 200 mesh mullite, 5 parts of light-burned magnesia, 3.5 parts of sodium bentonite, 14 parts of PVA thick glue with an active ingredient ratio of 10%, and the effective ingredient ratio is 24 parts of 30% alkaline silica sol, 7.2 parts of aluminum dihydrogen phosphate, 2.4 parts of redispersible white rubber powder, 9.6 parts of styrene-acrylic emulsion with an active ingredient ratio of 48%, 0.5 part of JFC penetrant, and 0.5 part of washing powder , 130 parts of water. In this scheme, the number of PVA thick glue is increased, and water is added to dissolve it. The advantage of this setting is that the inorganic binder is added, the hardness increases after drying, the high temperature resistance...

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Abstract

The invention relates to the technical field of expendable pattern casting, and specifically, to a sand-burning-resistant water-based expendable pattern coating for gray iron casting and application and a preparation method of the coating. According to the coating, flaky graphite, mullite, and light calcined magnesia are organically matched, so that the coating is difficult to penetrate through bycontinuous high-temperature molten iron. By optimizing resin and an auxiliary, the coating is high in drying speed under an oven-drying condition of 70 to 85 DEG C, and can also be smoothly operatedin a severe environment; and by utilizing the light calcined magnesia and the flaky graphite, the coating can be easily peeled off from the surface of a cast piece after being poured, the cast piece is good in appearance quality, the later fire treatment is not needed, and the casting time is greatly saved. White rubber powder, styrene-acrylate resin, and two inorganic adhesives are utilized, so that the hardness of the coating is improved, a model is difficult to damage, and the coating is difficult to permeate under the scouring of the molten iron. By utilizing a JFC penetrating agent and asurfactant, the adhesiveness of the coating and EPS foam is good, the bareness is difficult in a brushing process, an air hole can be guaranteed in the surface of the dried coating, and the air permeability of the coating is guaranteed.

Description

technical field [0001] The invention relates to the technical field of lost foam casting, in particular to an anti-sand sticking water-based lost foam coating for gray iron casting, an application and a preparation method of the coating. Background technique [0002] Lost foam casting technology, referred to as EPC. Belonging to solid casting, EPC castings have high shape and size and good repeatability, and are widely used in automotive molds, machine tool shells, cylinder shells and other fields. Modern machinery pursues precision and function, and the complexity and precision of parts and housings have increased significantly. Traditional casting is usually time-consuming and labor-intensive, so EPC is widely used. At present, most complex parts, casings, and precision parts are manufactured by EPC. In order to control the appearance quality and precision of complex parts, EPC often needs to use suitable separation coatings to separate molten iron and molding sand. Lost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00B22C9/04
CPCB22C3/00B22C9/04
Inventor 武萌马靖周立权高灵强阳培翔陈立江鲁晨光
Owner 四川省宜宾普什集团有限公司
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