CN108927489B - Improved method for improving lost foam casting manufacturing precision - Google Patents
Improved method for improving lost foam casting manufacturing precision Download PDFInfo
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- CN108927489B CN108927489B CN201810935057.9A CN201810935057A CN108927489B CN 108927489 B CN108927489 B CN 108927489B CN 201810935057 A CN201810935057 A CN 201810935057A CN 108927489 B CN108927489 B CN 108927489B
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- parts
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- lost foam
- precision
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses an improved method for improving lost foam casting manufacturing precision, which specifically comprises the steps of coating a layer of special precision optimizing coating on the surface of a foam plastic pattern; the special precision optimization coating comprises the following substances: modified filler, silane coupling agent, polyethylene glycol, sodium pyrophosphate, fatty alcohol-polyoxyethylene ether, styrene-acrylic emulsion, vaseline, ethyl acetate and deionized water. The invention provides a special improved treatment method, which can obviously improve the quality of the casting, such as surface precision and the like, improve the use value of the casting, prolong the service life of the casting, and have great popularization and application values and production and use benefits.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to an improved method for improving lost foam casting manufacturing precision.
Background
A plurality of existing castings are cast by adopting a lost foam casting method, and the specific principle and mode are as follows: the foam polystyrene plastic mould is used for moulding instead of a casting mould, the mould sample is not taken out and is a solid casting mould, molten metal is poured in, and the mould sample is gasified, so that an ideal casting piece is obtained. The surface of the foam plastic pattern is required to be coated with paint before casting, so that an isolation layer is formed between the foam plastic pattern and a sand mold, the adhesion of sand grains to the surface of a casting piece is reduced, the sand is convenient to strip from the surface of the casting piece, and the quality of the casting piece is improved. The coating not only influences the gasification of a foam plastic pattern and the migration of gas, but also is closely related to the surface quality, surface defects, casting precision and the internal quality of a casting, and the like of the casting.
Disclosure of Invention
The invention aims to provide an improved method for improving the manufacturing precision of lost foam casting, aiming at the existing problems.
The invention is realized by the following technical scheme:
an improved method for improving the manufacturing precision of lost foam casting, which is specifically to coat a layer of special precision optimizing coating on the surface of a foam plastic pattern; the special precision optimizing coating comprises the following substances in parts by weight: 10-15 parts of modified filler, 7-10 parts of silane coupling agent, 8-12 parts of polyethylene glycol, 4-7 parts of sodium pyrophosphate, 5-8 parts of fatty alcohol-polyoxyethylene ether, 20-25 parts of phenylpropyl emulsion, 3-6 parts of vaseline, 15-20 parts of ethyl acetate and 190-200 parts of deionized water.
Further, before the special precision optimizing coating is coated on the surface of the foam plastic model, a layer of common lost foam casting coating is coated on the surface of the foam plastic model, and then the foam plastic model coated with the lost foam casting coating is dried to be surface-dried and then the special precision optimizing coating is coated.
Further, the lost foam casting coating is a water-based coating.
Further, the water-based paint comprises the following components in parts by weight: 10-15 parts of calcium carbonate, 15-20 parts of binder, 6-10 parts of suspending agent, 1-3 parts of defoaming agent, 0.5-1.5 parts of preservative and 90-100 parts of water.
Further, the preparation method of the modified filler comprises the following steps:
(1) weighing the following substances in parts by weight for later use: 3-5 parts of bentonite, 4-6 parts of attapulgite and 7-9 parts of sepiolite powder;
(2) putting the bentonite, the attapulgite and the sepiolite powder weighed in the step (1) into a calcining furnace together for calcining treatment, and taking out for later use after 1-2 hours;
(3) and (3) putting the bentonite, the attapulgite and the sepiolite powder treated in the step (2) into an irradiation box together for irradiation treatment, and taking out after 50-55 min.
Further, the particle size of the bentonite in the step (1) is 1600-1800 meshes, the particle size of the attapulgite is 800-1000 meshes, and the particle size of the sepiolite powder is 200-300 meshes.
Further, the temperature in the calcining furnace is controlled to be 800-850 ℃ during the calcining treatment in the step (2).
Further, the irradiation treatment in the step (3) is He ion irradiation treatment, the irradiation energy is controlled to be 320-340 keV, the irradiation temperature is controlled to be 480-500 ℃, and the injection amount is 8-9 × 1016cm-2。
Further, the silane coupling agent is any one of a silane coupling agent kh550, a silane coupling agent kh560 and a silane coupling agent kh 570.
The method for improving the casting quality of a casting by coating the surface of a foam plastic pattern in a lost foam is a common and even necessary step in the existing lost foam casting method, in order to further improve the service performance of the coating, most methods are to improve the components of the coating, and a plurality of performance additives are usually additionally added, so that a certain improvement effect can be obtained, but the inconvenience of preparation, storage and the like is caused by excessive raw material components, the adjustment of production line equipment, working procedures and the like is brought by the change of process components for the existing molding factory equipment, and meanwhile, secondary processing treatment cannot be carried out on a large amount of prepared coatings, the performance cannot be enhanced, and the market competitiveness is reduced. The lost foam casting coating is different from the traditional molding sand in that: the invention carries out special treatment on the casting mode according to the characteristics, particularly carries out special treatment on the foam plastic pattern, coats a layer of special precision optimizing coating on the outer surface of the traditional lost foam casting coating, has the problems of poor mechanical property, easy cracking and damage, sand component outflow, low surface precision of casting pieces and the like of most of the existing lost foam casting coatings, has higher temperature of casting liquid, generates expansion pressure impact on molding sand, has certain yielding performance although the molding sand has certain yielding performance, and can influence the yielding uniformity of the molding sand on the casting pieces when the integral strength of the coating is low and the tissue binding force difference of each part of the coating is large, therefore, the surface quality of the coating can be influenced, the special precision optimization coating is specially prepared for the coating, the coating comprises modified filler, styrene-acrylic emulsion and the like, the modified filler has excellent performance and is prepared by compounding bentonite, attapulgite and sepiolite powder, the modified filler is calcined firstly, the specific surface area and the adsorption capacity are improved, then He ion irradiation treatment is carried out, a large number of active groups are generated on the surfaces of the three fillers after irradiation treatment, the reaction capacity and the surface activity are improved, the modified filler is better compatible, combined and fixed with other components in the coating, and helium bubbles with small particle size are generated inside the three fillers when the He ion irradiation treatment is carried out, so that the specific surface area and the adsorption capacity of the three fillers are further improved, the lamellar filler molecules are loosely deformed, the interlayer spacing is increased, and the impact resistance is enhanced, the casting liquid has better deformability, thermal shock can be better buffered when the casting liquid is injected, the quality of a casting is further improved, and in addition, the particle sizes of the three fillers are strictly limited and matched, so that the filling and dispersing uniformity is better facilitated, and the integral impact resistance of the special precision optimized coating film layer can be further enhanced. The prepared special precision optimizing coating has good adhesiveness with the lost foam casting coating, has large bonding strength, forms a cross-linked three-dimensional strengthening coating after being coated and cured on the outer surface of the lost foam casting coating, improves the integral mechanical strength characteristic of the original lost foam casting coating and the uniformity of the bonding strength of each tissue of the coating, ensures the yielding uniformity of the coating to a casting, improves the quality of the casting, reduces the coating process precision because the special precision optimizing coating is coated on the outer surface of the lost foam casting coating, and is beneficial to popularization and application.
Compared with the prior art, the invention has the following advantages:
the invention provides a special improved treatment method, which can obviously improve the quality of the casting, such as surface precision and the like, improve the use value of the casting, prolong the service life of the casting, and have great popularization and application values and production and use benefits.
Detailed Description
Example 1
An improved method for improving the manufacturing precision of lost foam casting, which is specifically to coat a layer of special precision optimizing coating on the surface of a foam plastic pattern; the special precision optimizing coating comprises the following substances in parts by weight: 10 parts of modified filler, 7 parts of silane coupling agent, 8 parts of polyethylene glycol, 4 parts of sodium pyrophosphate, 5 parts of fatty alcohol-polyoxyethylene ether, 20 parts of styrene-acrylic emulsion, 3 parts of vaseline, 15 parts of ethyl acetate and 190 parts of deionized water.
Further, before the special precision optimizing coating is coated on the surface of the foam plastic model, a layer of common lost foam casting coating is coated on the surface of the foam plastic model, and then the foam plastic model coated with the lost foam casting coating is dried to be surface-dried and then the special precision optimizing coating is coated.
Further, the lost foam casting coating is a water-based coating.
Further, the water-based paint comprises the following components in parts by weight: 10 parts of calcium carbonate, 15 parts of binder, 6 parts of suspending agent, 1 part of defoaming agent, 0.5 part of preservative and 90 parts of water.
Further, the preparation method of the modified filler comprises the following steps:
(1) weighing the following substances in parts by weight for later use: 3 parts of bentonite, 4 parts of attapulgite and 7 parts of sepiolite powder;
(2) putting the bentonite, the attapulgite and the sepiolite powder weighed in the step (1) into a calcining furnace together for calcining treatment, and taking out for later use after 1 h;
(3) and (3) putting the bentonite, the attapulgite and the sepiolite powder processed in the step (2) into an irradiation box together for irradiation treatment, and taking out after 50 min.
Further, the particle size of the bentonite in the step (1) is 1600 meshes, the particle size of the attapulgite is 800 meshes, and the particle size of the sepiolite powder is 200 meshes.
Further, the temperature in the calciner is controlled to be 800 ℃ during the calcination treatment in the step (2).
Further, the irradiation treatment in the step (3) is He ion irradiation treatment, and the irradiation energy is controlled to 320keV, the irradiation temperature is controlled to 480 ℃, and the implantation amount is 8 × 1016cm-2。
Further, the silane coupling agent is a silane coupling agent kh 550.
Example 2
An improved method for improving the manufacturing precision of lost foam casting, which is specifically to coat a layer of special precision optimizing coating on the surface of a foam plastic pattern; the special precision optimizing coating comprises the following substances in parts by weight: 13 parts of modified filler, 9 parts of silane coupling agent, 10 parts of polyethylene glycol, 6 parts of sodium pyrophosphate, 7 parts of fatty alcohol-polyoxyethylene ether, 23 parts of styrene-acrylic emulsion, 5 parts of vaseline, 18 parts of ethyl acetate and 195 parts of deionized water.
Further, before the special precision optimizing coating is coated on the surface of the foam plastic model, a layer of common lost foam casting coating is coated on the surface of the foam plastic model, and then the foam plastic model coated with the lost foam casting coating is dried to be surface-dried and then the special precision optimizing coating is coated.
Further, the lost foam casting coating is a water-based coating.
Further, the water-based paint comprises the following components in parts by weight: 13 parts of calcium carbonate, 18 parts of binder, 8 parts of suspending agent, 2 parts of defoaming agent, 1 part of preservative and 95 parts of water.
Further, the preparation method of the modified filler comprises the following steps:
(1) weighing the following substances in parts by weight for later use: 4 parts of bentonite, 5 parts of attapulgite and 8 parts of sepiolite powder;
(2) putting the bentonite, the attapulgite and the sepiolite powder weighed in the step (1) into a calcining furnace together for calcining treatment, and taking out for later use after 1.5 hours;
(3) and (3) putting the bentonite, the attapulgite and the sepiolite powder processed in the step (2) into an irradiation box together for irradiation treatment, and taking out the bentonite, the attapulgite and the sepiolite powder after 53 min.
Further, the particle size of the bentonite in the step (1) is 1700 meshes, the particle size of the attapulgite is 900 meshes, and the particle size of the sepiolite powder is 250 meshes.
Further, the temperature in the calciner is controlled to be 830 ℃ during the calcination treatment in the step (2).
Further, the irradiation treatment in the step (3) is He ion irradiation treatment, and the irradiation energy is controlled to 330keV, the irradiation temperature is controlled to 490 ℃, and the implantation amount is 8.5 × 1016cm-2。
Further, the silane coupling agent is a silane coupling agent kh 560.
Example 3
An improved method for improving the manufacturing precision of lost foam casting, which is specifically to coat a layer of special precision optimizing coating on the surface of a foam plastic pattern; the special precision optimizing coating comprises the following substances in parts by weight: 15 parts of modified filler, 10 parts of silane coupling agent, 12 parts of polyethylene glycol, 7 parts of sodium pyrophosphate, 8 parts of fatty alcohol-polyoxyethylene ether, 25 parts of styrene-acrylic emulsion, 6 parts of vaseline, 20 parts of ethyl acetate and 200 parts of deionized water.
Further, before the special precision optimizing coating is coated on the surface of the foam plastic model, a layer of common lost foam casting coating is coated on the surface of the foam plastic model, and then the foam plastic model coated with the lost foam casting coating is dried to be surface-dried and then the special precision optimizing coating is coated.
Further, the lost foam casting coating is a water-based coating.
Further, the water-based paint comprises the following components in parts by weight: 15 parts of calcium carbonate, 20 parts of binder, 10 parts of suspending agent, 3 parts of defoaming agent, 1.5 parts of preservative and 100 parts of water.
Further, the preparation method of the modified filler comprises the following steps:
(1) weighing the following substances in parts by weight for later use: 5 parts of bentonite, 6 parts of attapulgite and 9 parts of sepiolite powder;
(2) putting the bentonite, the attapulgite and the sepiolite powder weighed in the step (1) into a calcining furnace together for calcining treatment, and taking out for later use after 2 hours;
(3) and (3) putting the bentonite, the attapulgite and the sepiolite powder processed in the step (2) into an irradiation box together for irradiation treatment, and taking out after 55 min.
Further, the particle size of the bentonite in the step (1) is 1800 meshes, the particle size of the attapulgite is 1000 meshes, and the particle size of the sepiolite powder is 300 meshes.
Further, the temperature in the calciner is controlled to be 850 ℃ during the calcination treatment in the step (2).
Further, the irradiation treatment in the step (3) is He ion irradiation treatment, and the irradiation energy is controlled to 340keV, the irradiation temperature is controlled to 500 ℃, and the implantation amount is 9 × 1016cm-2。
Further, the silane coupling agent is a silane coupling agent kh 570.
Comparative example 1
This comparative example 1 compares with example 2 in the preparation of a modified filler, the treatment operation of step (3) is omitted, except that the process steps are the same.
Comparative example 2
Compared with the example 2, in the preparation of the modified filler, the particle diameters of bentonite, attapulgite and sepiolite powder are controlled to be 1000 meshes, and the steps of the method are the same except for the difference.
Comparative example 3
This comparative example 3, compared to example 2, omits the modified filler component of the specialized precision optimized coating, except that the process steps are otherwise identical.
In order to compare the effects of the invention, the lost foam prepared in the same batch is treated by the methods described in the above example 2, comparative example 1, comparative example 2 and comparative example 3, and then cast according to the same casting process, and finally the cast finished casting is subjected to quality test, wherein the specific comparative data are shown in the following table 1:
TABLE 1
As can be seen from the above table 1, the improved treatment method of the invention can obviously improve the workpiece precision of lost foam casting, and has great market competitiveness and popularization and application values.
Claims (3)
1. An improved method for improving the manufacturing precision of lost foam casting is characterized in that a layer of special precision optimizing coating is coated on the surface of a foam plastic pattern; the special precision optimizing coating comprises the following substances in parts by weight: 10-15 parts of modified filler, 7-10 parts of silane coupling agent, 8-12 parts of polyethylene glycol, 4-7 parts of sodium pyrophosphate, 5-8 parts of fatty alcohol-polyoxyethylene ether, 20-25 parts of phenylpropyl emulsion, 3-6 parts of vaseline, 15-20 parts of ethyl acetate and 190-200 parts of deionized water;
the preparation method of the modified filler comprises the following steps:
(1) weighing the following substances in parts by weight for later use: 3-5 parts of bentonite, 4-6 parts of attapulgite and 7-9 parts of sepiolite powder; the particle size of the bentonite is 1600-1800 meshes, the particle size of the attapulgite is 800-1000 meshes, and the particle size of the sepiolite powder is 200-300 meshes;
(2) putting the bentonite, the attapulgite and the sepiolite powder weighed in the step (1) into a calcining furnace together for calcining treatment, and taking out for later use after 1-2 hours; during the calcination treatment, the temperature in the calcination furnace is controlled to be 800-850 ℃;
(3) putting the bentonite, the attapulgite and the sepiolite powder processed in the step (2) into an irradiation box together for irradiation treatment, and taking out the materials after 50-55 min, wherein the irradiation treatment is He ion irradiation treatment, the irradiation energy is controlled to be 320-340 keV, the irradiation temperature is controlled to be 480-500 ℃, and the injection amount is 8-9 × 1016cm-2。
2. The improved method for improving the precision of lost foam casting according to claim 1, wherein before the special precision optimizing coating is coated on the surface of the foam plastic pattern, a layer of common lost foam casting coating is coated on the surface of the foam plastic pattern, and then the foam plastic pattern coated with the lost foam casting coating is dried to the surface and then the special precision optimizing coating is coated;
the lost foam casting coating is water-based;
the water-based paint comprises the following components in parts by weight: 10-15 parts of calcium carbonate, 15-20 parts of binder, 6-10 parts of suspending agent, 1-3 parts of defoaming agent, 0.5-1.5 parts of preservative and 90-100 parts of water.
3. The improved method for improving the precision of lost foam casting according to claim 1, wherein the silane coupling agent is any one of a silane coupling agent kh550, a silane coupling agent kh560 and a silane coupling agent kh 570.
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| CN201810935057.9A CN108927489B (en) | 2018-08-16 | 2018-08-16 | Improved method for improving lost foam casting manufacturing precision |
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| CN201810935057.9A CN108927489B (en) | 2018-08-16 | 2018-08-16 | Improved method for improving lost foam casting manufacturing precision |
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| CN109550900A (en) * | 2018-12-18 | 2019-04-02 | 汉中燕航精工机械有限公司 | A kind of casting technique of evaporative pattern |
| CN112007053A (en) * | 2020-09-17 | 2020-12-01 | 广东汇群中药饮片股份有限公司 | Surface treatment method for traditional Chinese medicine wall-broken decoction piece powder |
| CN112899668A (en) * | 2021-01-26 | 2021-06-04 | 温州万虹阀门有限公司 | Surface treatment process for valve body casting part |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01266941A (en) * | 1988-04-20 | 1989-10-24 | Mitsubishi Heavy Ind Ltd | Facing agent for lost foam pattern |
| JPH02192847A (en) * | 1989-01-20 | 1990-07-30 | Mitsubishi Motors Corp | Casting method with lost foam pattern |
| CN1385265A (en) * | 2002-03-26 | 2002-12-18 | 华中科技大学 | Technology for precision casting metal die and parts |
| CN101497105A (en) * | 2009-03-12 | 2009-08-05 | 深圳市景鼎现代科技有限公司 | Cast form water borne coating and technique for preparing the same |
| CN103008531A (en) * | 2012-12-21 | 2013-04-03 | 安徽中兴华汉机械有限公司 | Special paint for evaporative pattern cast iron and manufacturing method of special paint |
| CN103212671A (en) * | 2013-04-22 | 2013-07-24 | 重庆汉华汽车零部件制造有限公司 | Technology for casting swing bolster and side frame of railway locomotive by adopting evanescent mode |
| CN104690219A (en) * | 2013-12-07 | 2015-06-10 | 青岛大运机械有限公司 | Anti-corrosion waterproof coating for evanescent mode |
| CN107243594A (en) * | 2017-06-14 | 2017-10-13 | 合肥市旺友门窗有限公司 | A kind of used in aluminium alloy casting insulating refractory coating and preparation method thereof |
| CN107497991A (en) * | 2017-08-21 | 2017-12-22 | 安徽省含山县兴建铸造厂 | A kind of heavy punch piece coating for dispellable mould casting |
-
2018
- 2018-08-16 CN CN201810935057.9A patent/CN108927489B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01266941A (en) * | 1988-04-20 | 1989-10-24 | Mitsubishi Heavy Ind Ltd | Facing agent for lost foam pattern |
| JPH02192847A (en) * | 1989-01-20 | 1990-07-30 | Mitsubishi Motors Corp | Casting method with lost foam pattern |
| CN1385265A (en) * | 2002-03-26 | 2002-12-18 | 华中科技大学 | Technology for precision casting metal die and parts |
| CN101497105A (en) * | 2009-03-12 | 2009-08-05 | 深圳市景鼎现代科技有限公司 | Cast form water borne coating and technique for preparing the same |
| CN103008531A (en) * | 2012-12-21 | 2013-04-03 | 安徽中兴华汉机械有限公司 | Special paint for evaporative pattern cast iron and manufacturing method of special paint |
| CN103212671A (en) * | 2013-04-22 | 2013-07-24 | 重庆汉华汽车零部件制造有限公司 | Technology for casting swing bolster and side frame of railway locomotive by adopting evanescent mode |
| CN104690219A (en) * | 2013-12-07 | 2015-06-10 | 青岛大运机械有限公司 | Anti-corrosion waterproof coating for evanescent mode |
| CN107243594A (en) * | 2017-06-14 | 2017-10-13 | 合肥市旺友门窗有限公司 | A kind of used in aluminium alloy casting insulating refractory coating and preparation method thereof |
| CN107497991A (en) * | 2017-08-21 | 2017-12-22 | 安徽省含山县兴建铸造厂 | A kind of heavy punch piece coating for dispellable mould casting |
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