CN102873263B - Lost foam casting technology for sand burning-resistance cast steel - Google Patents

Lost foam casting technology for sand burning-resistance cast steel Download PDF

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CN102873263B
CN102873263B CN201210320026.5A CN201210320026A CN102873263B CN 102873263 B CN102873263 B CN 102873263B CN 201210320026 A CN201210320026 A CN 201210320026A CN 102873263 B CN102873263 B CN 102873263B
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陈立国
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TAICANG KEBOER PRECISION CASTING CO Ltd
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Abstract

本发明涉及一种防粘砂铸钢消失模铸造工艺,包括制作模型簇、制备内层涂料、制备外层涂料、用内层涂料和外层涂料处理消失模模样、振动造型、浇铸置换和冷却等步骤。经涂料残片分析,涂层没有被钢水侵入,涂层内层的耐火骨料颗粒间受到融化的玻璃相填充,阻止了钢水的入侵,同时也避免了铸件粘砂现象。

The invention relates to an anti-adhesive sand cast steel lost foam casting process, including making model clusters, preparing inner coatings, preparing outer coatings, using inner coatings and outer coatings to treat lost foam patterns, vibration modeling, casting replacement and cooling and other steps. According to the analysis of paint fragments, the coating was not invaded by molten steel, and the refractory aggregate particles in the inner layer of the coating were filled with molten glass phase, which prevented the intrusion of molten steel and also avoided the phenomenon of sand sticking in castings.

Description

一种防粘砂铸钢消失模铸造工艺A lost foam casting process for anti-stick sand cast steel

技术领域 technical field

本发明涉及铸造领域,特别涉及消失模铸钢制造技术领域,具体涉及一种防粘砂铸钢消失模铸造工艺。The invention relates to the field of casting, in particular to the technical field of lost foam cast steel manufacturing, in particular to an anti-sticking sand cast steel lost foam casting process.

背景技术 Background technique

消失模铸造(又称实型铸造)是将与铸件尺寸形状相似的泡沫模型粘结组合成模型簇,刷涂耐火涂料并烘干后,埋在干石英砂中振动造型,在负压下浇注,使模型气化,液体金属占据模型位置,凝固冷却后形成铸件的新型铸造方法。Lost foam casting (also known as solid casting) is to bond and combine 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, and poured under negative pressure. , the model is vaporized, the liquid metal occupies the position of the model, solidified and cooled to form a new casting method of castings.

与传统铸造技术相比,消失模铸造有下列特点:1.铸件质量好,成本低;2.材质不限,大小皆宜;3.尺寸精度高,表面光洁,减少清理工作量;4.内部缺陷大大减少,组织致密;5.可实现大规模、大批量生产,可以大大改善作业环境、降低劳动强度、减少能源消耗。Compared with traditional casting technology, lost foam casting has the following characteristics: 1. Good casting quality and low cost; 2. Unlimited material and suitable size; 3. High dimensional accuracy, smooth surface, reducing cleaning workload; 4. Internal The defects are greatly reduced and the organization is dense; 5. It can realize large-scale and mass production, which can greatly improve the working environment, reduce labor intensity, and reduce energy consumption.

虽然消失模铸造工艺目前得到较快发展,但涂料技术还达不到理想的要求。因涂料性能直接影响铸件的质量,涂料除了隔离金属液和型砂的直接接触,防止铸件产生机械粘砂和化学粘砂外,还有一个重要作用:形成和保持铸件型腔。所以必须具有较高的常温强度以及高温强度,并且要有合适的高温透气性。Although the lost foam casting process has been developed rapidly, the coating technology has not yet met the ideal requirements. Because the performance of the coating directly affects the quality of the casting, the coating has an important role in addition to isolating the direct contact between the molten metal and the molding sand and preventing the mechanical and chemical sticking of the casting: forming and maintaining the casting cavity. Therefore, it must have high normal temperature strength and high temperature strength, and must have suitable high temperature air permeability.

然而,目前涂料的质量还有各方面的缺点,比如在铸钢生产中,浇铸冷却后,消失模涂料不容易从铸件上剥离,大幅增加后续砂轮打磨处理成本。However, the quality of the current coatings still has shortcomings in various aspects. For example, in the production of cast steel, the lost foam coating is not easy to peel off from the casting after casting cooling, which greatly increases the cost of subsequent grinding wheel grinding.

针对上述现象,申请人经过涂层残片分析,涂层内层与钢水直接接触,外层与型砂直接接触。浇铸时,高温钢水会将涂料内层润湿并浸入涂料骨料颗粒间隙。待浇铸完毕后,在铸件缓慢冷却过程中,钢水将涂层与铸件凝结成一体,从而使涂层难以从铸件表面剥离。In response to the above phenomenon, the applicant analyzed the coating fragments, and found that the inner layer of the coating was in direct contact with the molten steel, and the outer layer was in direct contact with the molding sand. During casting, the high-temperature molten steel will wet the inner layer of the paint and immerse into the gaps between the paint aggregate particles. After casting, during the slow cooling process of the casting, the molten steel condenses the coating and the casting into one, making it difficult for the coating to peel off from the surface of the casting.

从以上分析得知,只有让钢水不能浸入骨料颗粒间隙,形成明显的分界线,才能避免这种现象。然而由于骨料颗粒不能太小,否则会造透气性下降,模样气化产物不能顺利透出,会造成气孔、夹渣现象,使得铸件品质下降。From the above analysis, it is known that this phenomenon can only be avoided by preventing molten steel from immersing into the gaps between aggregate particles and forming a clear dividing line. However, because the aggregate particles should not be too small, otherwise the air permeability will decrease, and the appearance gasification products will not be able to penetrate smoothly, which will cause pores and slag inclusions, which will reduce the quality of castings.

发明内容 Contents of the invention

针对现有技术中的缺陷,申请人对涂料的配方作出调整,使涂层内部在高温浇注时能生成一层熔融状态的玻璃相,这样就能成功阻挡在钢水渗入耐火骨料之间。In view of the defects in the prior art, the applicant adjusted the formulation of the coating so that a layer of molten glass phase can be formed inside the coating when pouring at high temperature, so that it can successfully block the penetration of molten steel between the refractory aggregates.

本发明的目的在于提供一种防粘砂铸钢消失模铸造工艺。The object of the present invention is to provide an anti-stick sand cast steel lost foam casting process.

为了实现上述发明目的,本发明采用的技术方案如下:In order to realize the foregoing invention object, the technical scheme that the present invention adopts is as follows:

一种防粘砂铸钢消失模铸造工艺,包含以下步骤:A lost foam casting process for anti-stick sand cast steel, comprising the following steps:

1)将与铸件尺寸形状相似的泡沫模型粘结组合成模型簇;1) Bond and combine foam models similar in size and shape to castings to form model clusters;

2)制备内层涂料:2) Prepare inner coating:

a)在膨润土中加入水,高速搅拌后得到膨润土浆;a) adding water to the bentonite and stirring at a high speed to obtain bentonite slurry;

b)将水玻璃、羧甲基纤维素钠、正辛醇、脂肪醇聚氧乙烯醚加入水中,配制成水溶液;b) Add water glass, sodium carboxymethyl cellulose, n-octanol and fatty alcohol polyoxyethylene ether to water to prepare an aqueous solution;

c)将步骤a)得到的膨润土浆和石英粉加入步骤b)得到的水溶液中,在不断搅拌下加入水混制成内层涂料;c) Add the bentonite slurry and quartz powder obtained in step a) to the aqueous solution obtained in step b), and add water under constant stirring to make an inner coating;

3)制备外层涂料:3) Prepare the outer coating:

d)在钠基膨润土中加入水,高速搅拌后得到钠基膨润土浆;d) adding water to the sodium-based bentonite, and stirring at a high speed to obtain a sodium-based bentonite slurry;

e)将白溶胶、羧甲基纤维素钠、正辛醇、脂肪醇聚氧乙烯醚加入水中,配制成水溶液;e) Add white sol, sodium carboxymethyl cellulose, n-octanol, and fatty alcohol polyoxyethylene ether into water to prepare an aqueous solution;

f)将步骤d)得到的钠基膨润土浆和高铬钢玉加入步骤e)得到的水溶液中,在不断搅拌下加入水混制成外层涂料;f) Add the sodium-based bentonite slurry and high-chromium corundum obtained in step d) to the aqueous solution obtained in step e), and add water to mix under constant stirring to form an outer coating;

4)消失模模样首先浸入内层涂料,取出后干燥处理;干燥后再挂涂外层涂料,干燥;4) The appearance of the lost pattern is first immersed in the inner layer of paint, taken out and then dried; after drying, the outer layer of paint is hung and dried;

5)将步骤4)得到的模型置于沙箱内,填上干沙,进行震动紧实,在沙箱上覆盖塑料薄膜并对沙箱内抽真空;5) Put the model obtained in step 4) in the sandbox, fill it with dry sand, vibrate and compact it, cover the sandbox with a plastic film and vacuum the sandbox;

6)将熔化的金属浇铸到模型区域,消失模气化,金属置换模型,经冷却后取出铸件。6) The molten metal is cast into the model area, the lost foam is gasified, the metal replaces the model, and the casting is taken out after cooling.

进一步地,步骤2)中制备内层涂料的各组分的配比为:石英粉25~75重量份、膨润土1~3重量份、水玻璃0.5~1.5重量份、羧甲基纤维素钠0.75~2.25重量份、正辛醇0.15~0.45重量份,脂肪醇聚氧乙烯醚0.15~0.45重量份。Further, in step 2), the ratio of each component for preparing the inner coating is: 25-75 parts by weight of quartz powder, 1-3 parts by weight of bentonite, 0.5-1.5 parts by weight of water glass, 0.75 parts by weight of sodium carboxymethyl cellulose ~2.25 parts by weight, 0.15~0.45 parts by weight of n-octanol, and 0.15~0.45 parts by weight of fatty alcohol polyoxyethylene ether.

在本发明的实施例中,步骤2)中制备内层涂料的各组分的配比为:石英粉50重量份、膨润土2重量份、水玻璃1重量份、羧甲基纤维素钠1.5重量份、正辛醇0.3重量份,脂肪醇聚氧乙烯醚0.3重量份。In the embodiment of the present invention, the ratio of the components of the inner coating in step 2) is: 50 parts by weight of quartz powder, 2 parts by weight of bentonite, 1 part by weight of water glass, and 1.5 parts by weight of sodium carboxymethyl cellulose 0.3 parts by weight of n-octanol, 0.3 parts by weight of fatty alcohol polyoxyethylene ether.

步骤a)中,膨润土与加入的水的重量比为1:10;步骤b)中,水玻璃与加入的水的重量比为1:20;步骤c)中,石英粉与在不断搅拌下加入的水的重量比为1:1。In step a), the weight ratio of bentonite to added water is 1:10; in step b), the weight ratio of water glass to added water is 1:20; in step c), quartz powder is added with constant stirring The weight ratio of water is 1:1.

进一步地,步骤3)中制备外层涂料的各组分的配比为:高铬钢玉25~75重量份、钠基膨润土1.5~4.5重量份、白溶胶0.25~0.75重量份、羧甲基纤维素钠0.75~2.25重量份、正辛醇0.15~0.45重量份,脂肪醇聚氧乙烯醚0.15~0.45重量份。Further, in step 3), the ratio of each component for preparing the outer coating is: 25-75 parts by weight of high-chromium corundum, 1.5-4.5 parts by weight of sodium bentonite, 0.25-0.75 parts by weight of white sol, carboxymethyl 0.75-2.25 parts by weight of sodium cellulose, 0.15-0.45 parts by weight of n-octanol, and 0.15-0.45 parts by weight of fatty alcohol polyoxyethylene ether.

在本发明的实施例中,步骤3)中制备外层涂料的各组分的配比为:高铬钢玉50重量份、钠基膨润土3重量份、白溶胶0.5重量份、羧甲基纤维素钠1.5重量份、正辛醇0.3重量份,脂肪醇聚氧乙烯醚0.3重量份。In the embodiment of the present invention, the ratio of the components of the outer coating in step 3) is: 50 parts by weight of high chromium corundum, 3 parts by weight of sodium bentonite, 0.5 parts by weight of white sol, carboxymethyl fiber 1.5 parts by weight of plain sodium, 0.3 parts by weight of n-octanol, and 0.3 parts by weight of fatty alcohol polyoxyethylene ether.

步骤d)中,钠基膨润土与加入的水的重量比为1:10;步骤e)中,白溶胶与加入的水的重量比为1:40;步骤f)中,高铬钢玉与在不断搅拌下加入的水的重量比为1:1。In step d), the weight ratio of sodium bentonite to added water is 1:10; in step e), the weight ratio of white sol to added water is 1:40; in step f), high chromium corundum is mixed with The weight ratio of water added under constant stirring is 1:1.

进一步地,步骤c)和f)中的搅拌方式为:先高速搅拌1小时再低速搅拌排出内层涂料和外层涂料中卷入的气体,保持低速搅拌10小时左右。Further, the stirring method in steps c) and f) is: first stir at high speed for 1 hour, then stir at low speed to discharge the gas involved in the inner coating and outer coating, and keep stirring at low speed for about 10 hours.

在本发明的实施例中,步骤4)中挂涂外层涂料的次数为2-5次。干燥温度为40~60℃,干燥时间为2-8小时。In an embodiment of the present invention, the number of times of hang-coating the outer coating in step 4) is 2-5 times. The drying temperature is 40~60℃, and the drying time is 2-8 hours.

本发明具有以下有益效果:铸件冷却后,大部分涂片自动从铸件表面剥离,剥离效果突出。即使少部分没剥落的涂层,后续处理也大为简化,节省了大量人工。经涂料残片分析,涂层没有被钢水侵入,涂层内层的耐火骨料颗粒间受到融化的玻璃相填充,阻止了钢水的入侵,同时也避免了铸件粘砂现象。The invention has the following beneficial effects: after the casting is cooled, most of the smears are automatically peeled off from the surface of the casting, and the peeling effect is outstanding. Even if there is a small part of the coating that does not peel off, the subsequent processing is greatly simplified and a lot of labor is saved. According to the analysis of coating fragments, the coating has not been invaded by molten steel, and the refractory aggregate particles in the inner layer of the coating are filled with molten glass phase, which prevents the intrusion of molten steel and also avoids the phenomenon of sand sticking in castings.

附图说明 Description of drawings

图1是本发明公开的防粘砂铸钢消失模铸造工艺的流程图。Fig. 1 is a flow chart of the lost foam casting process of anti-stick sand cast steel disclosed by the present invention.

具体实施方式 Detailed ways

以下结合实施例对本发明作进一步说明,但并非限制本发明的应用范围。The present invention will be further described below in conjunction with the examples, but the scope of application of the present invention is not limited.

实施例1Example 1

一种防粘砂铸钢消失模铸造工艺,包含以下步骤:A lost foam casting process for anti-stick sand cast steel, comprising the following steps:

1)将与铸件尺寸形状相似的泡沫模型粘结组合成模型簇;1) Bond and combine foam models similar in size and shape to castings to form model clusters;

2)制备内层涂料:2) Prepare inner coating:

a)在1重量份膨润土中加入10重量份水,高速搅拌5小时后得到膨润土浆;a) Add 10 parts by weight of water to 1 part by weight of bentonite, and stir at a high speed for 5 hours to obtain bentonite slurry;

b)1.5重量份水玻璃、2.25重量份羧甲基纤维素钠、0.15重量份正辛醇、0.45重量份脂肪醇聚氧乙烯醚加入30重量份水中,配制成水溶液;b) Add 1.5 parts by weight of water glass, 2.25 parts by weight of sodium carboxymethyl cellulose, 0.15 parts by weight of n-octanol, and 0.45 parts by weight of fatty alcohol polyoxyethylene ether into 30 parts by weight of water to prepare an aqueous solution;

c)将步骤a)得到的膨润土浆和25重量份石英粉加入步骤b)得到的水溶液中,在不断搅拌下加入25重量份水混制成内层涂料,搅拌方式为:先高速搅拌1小时再低速搅拌排出内层涂料中卷入的气体,保持低速搅拌8小时;c) Add the bentonite slurry obtained in step a) and 25 parts by weight of quartz powder to the aqueous solution obtained in step b), and add 25 parts by weight of water under continuous stirring to make an inner coating. The stirring method is: first stir at high speed for 1 hour Then stir at a low speed to discharge the gas involved in the inner coating, and keep stirring at a low speed for 8 hours;

3)制备外层涂料:3) Prepare the outer coating:

d)在1.5重量份钠基膨润土中加入15重量份水,高速搅拌7小时后得到钠基膨润土浆;d) Add 15 parts by weight of water to 1.5 parts by weight of sodium bentonite, and stir at a high speed for 7 hours to obtain sodium bentonite slurry;

e)将0.75重量份白溶胶、2.25重量份羧甲基纤维素钠、0.15重量份正辛醇、0.45重量份脂肪醇聚氧乙烯醚加入30重量份水中,配制成水溶液;e) adding 0.75 parts by weight of white sol, 2.25 parts by weight of sodium carboxymethyl cellulose, 0.15 parts by weight of n-octanol, and 0.45 parts by weight of fatty alcohol polyoxyethylene ether into 30 parts by weight of water to prepare an aqueous solution;

f)将步骤d)得到的钠基膨润土浆和25重量份高铬钢玉加入步骤e)得到的水溶液中,在不断搅拌下加入25重量份水混制成外层涂料,搅拌方式为:先高速搅拌1小时再低速搅拌排出外层涂料中卷入的气体,保持低速搅拌11小时;f) Add the sodium-based bentonite slurry obtained in step d) and 25 parts by weight of high-chromium corundum to the aqueous solution obtained in step e), and add 25 parts by weight of water under continuous stirring to make an outer coating. The stirring method is: first Stir at high speed for 1 hour, then stir at low speed to discharge the gas involved in the outer coating, and keep stirring at low speed for 11 hours;

4)消失模模样首先浸入内层涂料,取出后干燥处理;干燥后再挂涂外层涂料,干燥;4) The appearance of the lost pattern is first immersed in the inner layer of paint, taken out and then dried; after drying, the outer layer of paint is hung and dried;

5)将步骤4)得到的模型置于沙箱内,填上干沙,进行震动紧实,在沙箱上覆盖塑料薄膜并对沙箱内抽真空;5) Put the model obtained in step 4) in the sandbox, fill it with dry sand, vibrate and compact it, cover the sandbox with a plastic film and vacuum the sandbox;

6)将熔化的金属浇铸到模型区域,消失模气化,金属置换模型,经冷却后取出铸件。6) The molten metal is cast into the model area, the lost foam is gasified, the metal replaces the model, and the casting is taken out after cooling.

实施例2Example 2

一种防粘砂铸钢消失模铸造工艺,包含以下步骤:A lost foam casting process for anti-stick sand cast steel, comprising the following steps:

1)将与铸件尺寸形状相似的泡沫模型粘结组合成模型簇;1) Bond and combine foam models similar in size and shape to castings to form model clusters;

2)制备内层涂料:2) Prepare inner coating:

a)在3重量份膨润土中加入30重量份水,高速搅拌7小时后得到膨润土浆;a) Add 30 parts by weight of water to 3 parts by weight of bentonite, and stir at a high speed for 7 hours to obtain bentonite slurry;

b)将0.5重量份水玻璃、0.75重量份羧甲基纤维素钠、0.45重量份正辛醇、0.15重量份脂肪醇聚氧乙烯醚加入10重量份水中,配制成水溶液;b) Add 0.5 parts by weight of water glass, 0.75 parts by weight of sodium carboxymethyl cellulose, 0.45 parts by weight of n-octanol, and 0.15 parts by weight of fatty alcohol polyoxyethylene ether into 10 parts by weight of water to prepare an aqueous solution;

c)将步骤a)得到的膨润土浆和75重量份石英粉加入步骤b)得到的水溶液中,在不断搅拌下加入75重量份水混制成内层涂料,搅拌方式为:先高速搅拌1小时再低速搅拌排出内层涂料中卷入的气体,保持低速搅拌10小时;c) Add the bentonite slurry obtained in step a) and 75 parts by weight of quartz powder to the aqueous solution obtained in step b), and add 75 parts by weight of water under continuous stirring to make an inner coating. The stirring method is: first stir at high speed for 1 hour Then stir at a low speed to discharge the gas involved in the inner coating, and keep stirring at a low speed for 10 hours;

3)制备外层涂料:3) Prepare the outer coating:

d)在4.5重量份钠基膨润土中加入45重量份水,高速搅拌5小时后得到钠基膨润土浆;d) Add 45 parts by weight of water to 4.5 parts by weight of sodium bentonite, and stir at a high speed for 5 hours to obtain sodium bentonite slurry;

e)将0.75重量份白溶胶、0.75重量份羧甲基纤维素钠、0.15重量份正辛醇、0.45重量份脂肪醇聚氧乙烯醚加入30重量份水中,配制成水溶液;e) adding 0.75 parts by weight of white sol, 0.75 parts by weight of sodium carboxymethyl cellulose, 0.15 parts by weight of n-octanol, and 0.45 parts by weight of fatty alcohol polyoxyethylene ether into 30 parts by weight of water to prepare an aqueous solution;

f)将步骤d)得到的钠基膨润土浆和75重量份高铬钢玉加入步骤e)得到的水溶液中,在不断搅拌下加入75重量份水混制成外层涂料,搅拌方式为:先高速搅拌1小时再低速搅拌排出外层涂料中卷入的气体,保持低速搅拌10小时;f) Add the sodium-based bentonite slurry obtained in step d) and 75 parts by weight of high-chromium corundum into the aqueous solution obtained in step e), and add 75 parts by weight of water under continuous stirring to make an outer coating. The stirring method is: first Stir at high speed for 1 hour, then stir at low speed to discharge the gas involved in the outer coating, and keep stirring at low speed for 10 hours;

4)消失模模样首先浸入内层涂料,取出后干燥处理;干燥后再挂涂外层涂料,干燥;4) The appearance of the lost pattern is first immersed in the inner layer of paint, taken out and then dried; after drying, the outer layer of paint is hung and dried;

5)将步骤4)得到的模型置于沙箱内,填上干沙,进行震动紧实,在沙箱上覆盖塑料薄膜并对沙箱内抽真空;5) Put the model obtained in step 4) in the sandbox, fill it with dry sand, vibrate and compact it, cover the sandbox with a plastic film and vacuum the sandbox;

6)将熔化的金属浇铸到模型区域,消失模气化,金属置换模型,经冷却后取出铸件。6) The molten metal is cast into the model area, the lost foam is gasified, the metal replaces the model, and the casting is taken out after cooling.

实施例3Example 3

一种防粘砂铸钢消失模铸造工艺,包含以下步骤:A lost foam casting process for anti-stick sand cast steel, comprising the following steps:

1)将与铸件尺寸形状相似的泡沫模型粘结组合成模型簇;1) Bond and combine foam models similar in size and shape to castings to form model clusters;

2)制备内层涂料:2) Prepare inner coating:

a)在2重量份膨润土中加入20重量份水,高速搅拌6小时后得到膨润土浆;a) Add 20 parts by weight of water to 2 parts by weight of bentonite, and stir at a high speed for 6 hours to obtain bentonite slurry;

b)将1重量份水玻璃、1.5重量份羧甲基纤维素钠、0.3重量份正辛醇、0.3重量份脂肪醇聚氧乙烯醚加入20重量份水中,配制成水溶液;b) Add 1 part by weight of water glass, 1.5 parts by weight of sodium carboxymethyl cellulose, 0.3 part by weight of n-octanol, and 0.3 part by weight of fatty alcohol polyoxyethylene ether into 20 parts by weight of water to prepare an aqueous solution;

c)将步骤a)得到的膨润土浆和50重量份石英粉加入步骤b)得到的水溶液中,在不断搅拌下加入50重量份水混制成内层涂料,搅拌方式为:先高速搅拌1小时再低速搅拌排出内层涂料中卷入的气体,保持低速搅拌11小时;c) Add the bentonite slurry obtained in step a) and 50 parts by weight of quartz powder to the aqueous solution obtained in step b), and add 50 parts by weight of water under continuous stirring to make an inner coating. The stirring method is: first stir at high speed for 1 hour Then stir at a low speed to discharge the gas involved in the inner coating, and keep stirring at a low speed for 11 hours;

3)制备外层涂料:3) Prepare the outer coating:

d)在3重量份钠基膨润土中加入30重量份水,高速搅拌6小时后得到钠基膨润土浆;d) Add 30 parts by weight of water to 3 parts by weight of sodium bentonite, and stir at a high speed for 6 hours to obtain sodium bentonite slurry;

e)将0.5重量份白溶胶、1.5重量份羧甲基纤维素钠、0.3重量份正辛醇、0.3重量份脂肪醇聚氧乙烯醚加入20重量份水中,配制成水溶液;e) Add 0.5 parts by weight of white sol, 1.5 parts by weight of sodium carboxymethyl cellulose, 0.3 parts by weight of n-octanol, and 0.3 parts by weight of fatty alcohol polyoxyethylene ether into 20 parts by weight of water to prepare an aqueous solution;

f)将步骤d)得到的钠基膨润土浆和50重量份高铬钢玉加入步骤e)得到的水溶液中,在不断搅拌下加入50重量份水混制成外层涂料,搅拌方式为:先高速搅拌1小时再低速搅拌排出外层涂料中卷入的气体,保持低速搅拌11小时;f) Add the sodium-based bentonite slurry obtained in step d) and 50 parts by weight of high-chromium corundum to the aqueous solution obtained in step e), and add 50 parts by weight of water under continuous stirring to make an outer coating. The stirring method is: first Stir at high speed for 1 hour, then stir at low speed to discharge the gas involved in the outer coating, and keep stirring at low speed for 11 hours;

4)消失模模样首先浸入内层涂料,取出后干燥处理;干燥后再挂涂外层涂料,干燥;4) The appearance of the lost pattern is first immersed in the inner layer of paint, taken out and then dried; after drying, the outer layer of paint is hung and dried;

5)将步骤4)得到的模型置于沙箱内,填上干沙,进行震动紧实,在沙箱上覆盖塑料薄膜并对沙箱内抽真空;5) Put the model obtained in step 4) in the sandbox, fill it with dry sand, vibrate and compact it, cover the sandbox with a plastic film and vacuum the sandbox;

6)将熔化的金属浇铸到模型区域,消失模气化,金属置换模型,经冷却后取出铸件。6) The molten metal is cast into the model area, the lost foam is gasified, the metal replaces the model, and the casting is taken out after cooling.

在本发明的实施例中,可以根据铸件情况可以挂涂外层涂料多次,例如2-5次。另外,为降低浇注时的发气量,保证铸件质量,泡沫塑料模样涂上涂料后必须烘干,保证足够的干燥时间使涂料烘干、烘透,温度控制在40-60度,时间2-8小时,必要时使用微波烘干燥,可以短时间内完成干燥过程。In the embodiment of the present invention, the outer coating can be hang-coated multiple times, such as 2-5 times, according to the condition of the casting. In addition, in order to reduce the amount of gas generated during pouring and ensure the quality of the casting, the foamed plastic pattern must be dried after being coated with paint to ensure sufficient drying time to dry and thoroughly dry the paint. The temperature is controlled at 40-60 degrees, and the time is 2-8. Hours, if necessary, use microwave drying to complete the drying process in a short time.

以上所述仅为本发明的较佳实施例,并非用来限定本发明的实施范围;如果不脱离本发明的精神和范围,对本发明进行修改或者等同替换,均应涵盖在本发明权利要求的保护范围当中。The above description is only a preferred embodiment of the present invention, and is not intended to limit the implementation scope of the present invention; if it does not depart from the spirit and scope of the present invention, any modification or equivalent replacement of the present invention shall be covered by the claims of the present invention. within the scope of protection.

Claims (8)

1. The sand adhesion preventing lost foam casting process for the cast steel is characterized by comprising the following steps of:
1) bonding and combining foam models with similar sizes and shapes with the castings to form a model cluster;
2) preparing an inner layer coating:
a) adding water into bentonite, and stirring at a high speed to obtain bentonite slurry;
b) adding water glass, sodium carboxymethylcellulose, n-octanol and fatty alcohol-polyoxyethylene ether into water to prepare an aqueous solution;
c) adding the bentonite slurry and the quartz powder obtained in the step a) into the aqueous solution obtained in the step b), and adding water under continuous stirring to prepare an inner layer coating;
3) preparing an outer layer coating:
d) adding water into sodium bentonite, and stirring at a high speed to obtain sodium bentonite slurry;
e) adding the white sol, sodium carboxymethylcellulose, n-octanol and fatty alcohol-polyoxyethylene ether into water to prepare an aqueous solution;
f) adding the sodium bentonite slurry obtained in the step d) and the high-chromium corundum into the aqueous solution obtained in the step e), and adding water under continuous stirring to prepare an outer layer coating;
4) firstly immersing the lost foam pattern into the inner layer coating, taking out and drying; after drying, coating an outer layer coating in a hanging way, and drying;
5) placing the model obtained in the step 4) in a sandbox, filling dry sand, vibrating to compact, covering a plastic film on the sandbox, and vacuumizing the sandbox;
6) casting the molten metal into a model area, gasifying the lost foam, replacing the model with the metal, and cooling and taking out the casting; wherein,
the mixture ratio of each component for preparing the inner layer coating in the step 2) is as follows: 25-75 parts of quartz powder, 1-3 parts of bentonite, 0.5-1.5 parts of water glass, 0.75-2.25 parts of sodium carboxymethylcellulose, 0.15-0.45 part of n-octanol and 0.15-0.45 part of fatty alcohol-polyoxyethylene ether;
the mixture ratio of the components for preparing the outer layer coating in the step 3) is as follows: 25-75 parts of high-chromium corundum, 1.5-4.5 parts of sodium bentonite, 0.25-0.75 part of white sol, 0.75-2.25 parts of sodium carboxymethylcellulose, 0.15-0.45 part of n-octanol and 0.15-0.45 part of fatty alcohol-polyoxyethylene ether.
2. The sand adhesion preventing cast steel lost foam casting process according to claim 1, wherein the ratio of each component for preparing the inner layer coating in the step 2) is as follows: 50 parts of quartz powder, 2 parts of bentonite, 1 part of water glass, 1.5 parts of sodium carboxymethylcellulose, 0.3 part of n-octanol and 0.3 part of fatty alcohol-polyoxyethylene ether.
3. The sand adhesion preventing cast steel lost foam casting process according to claim 1 or 2, characterized in that in step a), the weight ratio of bentonite to added water is 1: 10; in the step b), the weight ratio of the water glass to the added water is 1: 20; in step c), the weight ratio of the quartz powder to the water added under continuous stirring is 1: 1.
4. The sand adhesion preventing cast steel lost foam casting process according to claim 1, wherein the mixture ratio of the components for preparing the outer coating in the step 3) is as follows: 50 parts of high-chromium corundum, 3 parts of sodium bentonite, 0.5 part of white sol, 1.5 parts of sodium carboxymethylcellulose, 0.3 part of n-octanol and 0.3 part of fatty alcohol-polyoxyethylene ether.
5. The sand adhesion preventing cast steel lost foam casting process according to claim 1 or 4, characterized in that in step d), the weight ratio of sodium bentonite to added water is 1: 10; in the step e), the weight ratio of the white sol to the added water is 1: 40; in step f), the weight ratio of the high-chromium corundum to the water added under continuous stirring is 1: 1.
6. The sand release resistant cast steel lost foam casting process of claim 1, wherein the stirring mode in steps c) and f) is as follows: firstly stirring at a high speed for 1 hour, then stirring at a low speed to discharge gas involved in the inner layer coating and the outer layer coating, and keeping stirring at the low speed for about 10 hours.
7. The sand adhesion preventing cast steel lost foam casting process according to claim 1, wherein in step 4), the outer layer coating is hung 2-5 times.
8. The sand adhesion preventing cast steel lost foam casting process as claimed in claim 1, wherein in the step 4), the drying temperature is 40-60 ℃ and the drying time is 2-8 hours.
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CN103418745A (en) * 2013-07-12 2013-12-04 西华大学 String casting method for filling sand mold lost foams piece by piece (group)
CN104226905B (en) * 2014-09-01 2016-07-06 山西模范机械制造有限公司 The technique ensureing lost foam casting dry type internal combustion engine cylinders water channel cleaning
CN104226907A (en) * 2014-09-30 2014-12-24 无锡康柏斯机械科技有限公司 Lost foam casting process capable of compacting sand further
CN107470551B (en) * 2017-08-26 2019-04-30 唐山市鸿泉矿山机械有限公司 A kind of mold wash and its preparation method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57109539A (en) * 1980-12-27 1982-07-08 Akaishi Kozan Kk Casting sand for preventing sand burning of casting and method of application
JPH1157937A (en) * 1997-08-22 1999-03-02 Isuzu Motors Ltd Method for casting piston by lost foam process
CN101817058A (en) * 2010-03-30 2010-09-01 深圳市景鼎现代科技有限公司 Shield type coating composition and preparation process of coating thereof
CN102039372A (en) * 2011-01-11 2011-05-04 大连鸿骏源机械有限公司 Lost foam casting method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1011124B (en) * 1986-10-03 1991-01-09 刘汉生 Quick drying steel casting paint

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57109539A (en) * 1980-12-27 1982-07-08 Akaishi Kozan Kk Casting sand for preventing sand burning of casting and method of application
JPH1157937A (en) * 1997-08-22 1999-03-02 Isuzu Motors Ltd Method for casting piston by lost foam process
CN101817058A (en) * 2010-03-30 2010-09-01 深圳市景鼎现代科技有限公司 Shield type coating composition and preparation process of coating thereof
CN102039372A (en) * 2011-01-11 2011-05-04 大连鸿骏源机械有限公司 Lost foam casting method

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