CN103521411A - Method for brushing coatings on sand mould cores of hydrogenation valve carbon steel castings - Google Patents
Method for brushing coatings on sand mould cores of hydrogenation valve carbon steel castings Download PDFInfo
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- CN103521411A CN103521411A CN201310447357.XA CN201310447357A CN103521411A CN 103521411 A CN103521411 A CN 103521411A CN 201310447357 A CN201310447357 A CN 201310447357A CN 103521411 A CN103521411 A CN 103521411A
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- sand mold
- alcohol
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- hydrogenation valve
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Abstract
The invention discloses a method for brushing coatings on sand mould cores of hydrogenation valve carbon steel castings. The burnt-on sand defects of the castings can be effectively reduced or prevented, the surface roughness of the castings can be reduced, the cost for cleaning the castings can be lowered, and it is ensured that the requirements for the surface quality of the hydrogenation valve carbon steel castings can be met.
Description
Technical field
The present invention relates to sand casting paint field, be specifically related to be applicable to produce the sand mold of hydrogenation valve steel casting iron and the brushing method that core is used coating.
Background technology
In the last few years along with the manufacturing development of domestic valve and progress, by introducing technology, strengthen technical equipment and technological reserve, China has possessed the ability that hydrogenation valve is independently provided, and China Petrochemical Industry, PetroChina Company Limited., CNOOC all urgently wish that this series products realizes with state entering in generation early.Realize hydrogenation Valves localization, just first must capture the manufacturing technology of required foundry goods, China's starting is late, by 2010, substantially in blank.Dui Ci， our company strengthens research and development capabilities, and the special substance of hydrogenation valve foundry goods, manufacturing process etc. are carried out to research of technique.
In foundry production, the quality of the working surface that sand mold (core) directly contacts with molten metal has very important impact to casting quality.On sand mold (core) working surface, applying coatings is the method for improving the economic and practical of its quality and bringing notable results.For High-pressure Hydrogenation Unit, face hydrogen valve, because system is faced hydrogen, high pressure and with hydrogen sulfide corrosion, so the requirement to the working surface quality of hydrogenation valve foundry goods is higher than common valve foundry goods, sand casting is also had to higher requirement by coating and using method thereof.
Summary of the invention
In order to solve the above-mentioned technical problem existing in prior art, the invention provides the paint brush coating method of a kind of hydrogenation valve steel casting iron sand mold and core, comprise the steps:
Step 1: casting mold (core) surfacing, blows off floating sand;
Step 2: get alcohol radical magma zircon flour coating, trowelling is for the first time carried out on and sand mold (core) top layer corner abundant at foundry goods, and ignition after completing, is then down to room temperature;
Step 3: dilute former paste paint with industrial alcohol, preparation density is 1.61 ~ 1.70g/cm
3alcohol zircon flour coating, on sand mold (core) top layer, brush for the second time, thickness 0.1 ~ 0.2mm, ignition after completing, is then down to room temperature;
Step 4: dilute former paste paint with industrial alcohol, preparation density is 1.71 ~ 1.80g/cm
3alcohol zircon flour coating, on sand mold (core) top layer, brush for the third time, thickness 0.2 ~ 0.3mm, ignition after completing, is then down to room temperature, brushing completes.
Further, in described step 2, alcohol radical magma zircon flour coating requires as follows: density>=2.1g/cm
3, total solids content 73.5～75.5%, aggregate ZrO
2content 65%, after stirring, place 24h coating suspension rate>=93%, gas forming amount < 20mL/g.
Further, in described step 3, four, industrial alcohol requires as clear, colorless liquid, moisture≤5%.
The paint brush coating method of hydrogenation valve steel casting iron sand mold core of the present invention, can reduce or prevent foundry goods scab defect effectively, reduces surface roughness, reduces casting cleaning cost, guarantees the surface quality requirement of hydrogenation valve steel casting iron.
The specific embodiment
Below the invention will be further described.
The paint brush coating method of hydrogenation valve steel casting iron sand mold of the present invention and core, utilize the high refractoriness of coating, good stability at elevated temperature, the envelope group ponding of fine powder to sand grains gap, effectively slow down or avoid foundry goods/casting mold interface that hot melt, chemical reaction and infiltration occur, thereby reach, reduce or prevent that cast(ing) surface from producing the object of scab defect, guarantees the surface quality requirement of hydrogenation valve foundry goods.
The paint brush coating method of hydrogenation valve steel casting iron sand mold of the present invention and core, comprises the steps:
Step 1: casting mold (core) surfacing, with fine sandpaper, polish a little (noting not by surperficial hacking), blow off floating sand;
Step 2: get alcohol radical magma zircon flour coating, trowelling is for the first time carried out on and sand mold (core) top layer corner abundant at foundry goods, and ignition after completing, is then down to room temperature;
Step 3: dilute former paste paint with industrial alcohol, preparation density is 1.61 ~ 1.70g/cm
3alcohol zircon flour coating, on sand mold (core) top layer, brush for the second time, thickness 0.1 ~ 0.2mm, ignition after completing, is then down to room temperature;
Step 4: dilute former paste paint with industrial alcohol, preparation density is 1.71 ~ 1.80g/cm
3alcohol zircon flour coating, on sand mold (core) top layer, brush for the third time, thickness 0.2 ~ 0.3mm, ignition after completing, is then down to room temperature, brushing completes.
In described step 2, alcohol radical magma zircon flour coating requires as follows: density>=2.1g/cm
3, total solids content 73.5～75.5%, aggregate ZrO
2content 65%, after stirring, place 24h coating suspension rate>=93%, gas forming amount < 20mL/g.
In described step 3, four, industrial alcohol requires clear, colorless liquid, moisture≤5%.
Claims (3)
1. a paint brush coating method for hydrogenation valve steel casting iron sand mold and core, comprises the steps:
Step 1: casting mold (core) surfacing, blows off floating sand;
Step 2: get alcohol radical magma zircon flour coating, trowelling is for the first time carried out on and sand mold (core) top layer corner abundant at foundry goods, and ignition after completing, is then down to room temperature;
Step 3: dilute former paste paint with industrial alcohol, preparation density is 1.61 ~ 1.70g/cm
3alcohol zircon flour coating, on sand mold (core) top layer, brush for the second time, thickness 0.1 ~ 0.2mm, ignition after completing, is then down to room temperature;
Step 4: dilute former paste paint with industrial alcohol, preparation density is 1.71 ~ 1.80g/cm
3alcohol zircon flour coating, on sand mold (core) top layer, brush for the third time, thickness 0.2 ~ 0.3mm, ignition after completing, is then down to room temperature, brushing completes.
2. the paint brush coating method of hydrogenation valve steel casting iron sand mold as claimed in claim 1 and core, is characterized in that:
In described step 2, alcohol radical magma zircon flour coating requires as follows: density>=2.1g/cm
3, total solids content 73.5～75.5%, aggregate ZrO
2content 65%, after stirring, place 24h coating suspension rate>=93%, gas forming amount < 20mL/g.
3. the paint brush coating method of hydrogenation valve steel casting iron sand mold as claimed in claim 1 and core, is characterized in that:
In described step 3, four, industrial alcohol requires as clear, colorless liquid, moisture≤5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310447357.XA CN103521411B (en) | 2013-09-27 | 2013-09-27 | Method for brushing coatings on sand mould cores of hydrogenation valve carbon steel castings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310447357.XA CN103521411B (en) | 2013-09-27 | 2013-09-27 | Method for brushing coatings on sand mould cores of hydrogenation valve carbon steel castings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103521411A true CN103521411A (en) | 2014-01-22 |
| CN103521411B CN103521411B (en) | 2015-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310447357.XA Active CN103521411B (en) | 2013-09-27 | 2013-09-27 | Method for brushing coatings on sand mould cores of hydrogenation valve carbon steel castings |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105537531A (en) * | 2015-12-27 | 2016-05-04 | 无锡市灵通铸造有限公司 | Aftertreatment method for stainless steel pump valve sand mold |
| CN106040992A (en) * | 2016-08-15 | 2016-10-26 | 合肥江淮铸造有限责任公司 | Casting sand core paint dipping process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009039767A (en) * | 2007-08-10 | 2009-02-26 | Kao Corp | Method for making casting mold |
| CN101992263A (en) * | 2010-11-08 | 2011-03-30 | 上海市机械制造工艺研究所有限公司 | Process for large high-alloy steel resin bonded sand mould composite coating |
-
2013
- 2013-09-27 CN CN201310447357.XA patent/CN103521411B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009039767A (en) * | 2007-08-10 | 2009-02-26 | Kao Corp | Method for making casting mold |
| CN101992263A (en) * | 2010-11-08 | 2011-03-30 | 上海市机械制造工艺研究所有限公司 | Process for large high-alloy steel resin bonded sand mould composite coating |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105537531A (en) * | 2015-12-27 | 2016-05-04 | 无锡市灵通铸造有限公司 | Aftertreatment method for stainless steel pump valve sand mold |
| CN106040992A (en) * | 2016-08-15 | 2016-10-26 | 合肥江淮铸造有限责任公司 | Casting sand core paint dipping process |
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| Publication number | Publication date |
|---|---|
| CN103521411B (en) | 2015-07-22 |
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Address after: 322118 Zhejiang city of Jinhua province Dongyang city Hengdian Branch Road Electronic Industrial Park No. 33 Patentee after: Zhejiang innuovo Equipment Manufacturing Co., Ltd. Address before: 322118 Zhejiang city of Jinhua province Dongyang city Hengdian Branch Road Electronic Industrial Park No. 33 Patentee before: In SUFA Machinery Co., Ltd. Hengdian |
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