High-strength, deformation-resisting and collapsible precoated sand and preparation technology thereof
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A technology of anti-deformation and coated sand, applied in manufacturing tools, casting equipment, metal processing equipment, etc., can solve the problems of low gas generation, easy collapse, good fluidity, etc. The effect of improving mechanical properties
Inactive Publication Date: 2015-11-11
CHONGQING CHANGAN AUTOMOBILE CO LTD
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[0003] With the development of automobile engines in the direction of miniaturization, high performance, and complex structure, the coated sand should have the advantages of high strength, high fluidity, deformation resistance, easy collapse, and small gas generation. However, the existing coated sand It is difficult to meet the above requirements at the same time
For example, the patent of patent publication number CN102921878A discloses a kind of coated sand and its preparation method, and the patent publication number of CN103658506B discloses a kind of easy-filling coated sand and its preparation process. Compared with the manufactured sand core, it is difficult to have the advantages of high strength, good fluidity, easy collapse, low gas generation and high deformation resistance at the same time, and cannot meet the manufacturing needs of sand cores with complex structures and large differences in wall thickness
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Embodiment 1
[0026] Embodiment 1 Preparation of coated sand of the present invention
[0027] 1) Raw material preparation: sand, phenolic resin, curing agent, lubricant and disintegrating agent. Among them, the original sand is composed of 30% pearl sand and 70% quartz sand, the amount of phenolic resin added is 1.15% of the original sand mass, the amount of curing agent added is 13% of the amount of phenolic resin added, and the amount of lubricant added 0.1% of the mass of the original sand, and the addition of the disintegrating agent is 0.2% of the mass of the original sand.
[0028] 2) First put the raw sand composed of pearl sand and quartz sand into the sand mixer, mix and heat to 160°C;
[0029] 3) Then add phenolic resin, the addition time is 25s, and the mixing time is 50s;
[0030] 4) Add half of the lubricant, and the mixing time is 110s;
[0031] 5) Lower the sand temperature to 105°C, add the curing agent, the remaining half of the lubricant and the disintegrating agent, a...
Embodiment 2
[0034] Embodiment 2 Comparison of coated sand of the present invention and other existing products of the same type
[0035] There are three types of sand used in this comparative experiment, namely:
[0036] Coated sand A: the existing same type of coated sand (YKS-BH, Chongqing Changjiang Modeling Materials (Group) Co., Ltd.);
[0037] Coated sand B: Improved coated sand (increase the content of phenolic resin on the basis of coated sand A to improve the bending strength at room temperature);
[0038] Coated sand C: the coated sand obtained in Example 1;
[0039] (1) Performance comparison, the test standard refers to the industry standard JB-T8583-2008 (results are shown in Table 1);
[0040] Table 1 performance comparison
[0041]
[0042] According to the test results (Table 1), the room temperature flexural strength and thermal flexural strength of the improved coated sand B and the new coated sand C are significantly higher than those of the existing same type of ...
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Abstract
The invention belongs to the field of casting, and particularly relates to high-strength, deformation-resisting and collapsible precoated sand and a preparation technology thereof. The precoated sand and the preparation technology aim to solve the technical problem that a sand core made of precoated sand according to a ratio is low in strength and prone to deformation. The high-strength, deformation-resisting and collapsible precoated sand is composed of crude sand, phenolic resin, curing agents, lubricants and disperser, wherein the crude sand is composed of 20%-30% of nice foundry sand and 70%-80% of quartz sand, the addition quantity of the phenolic resin is 0.9%-1.2% of the mass of the crude sand, the addition quantity of the curing agents is 9%-13% that of the phenolic resin, the addition quantity of the lubricants is 0.1%-0.15% of the mass of the crude sand, and the addition quantity of the disperser is 0.05%-0.4% of the mass of the crude sand. The invention further provides the preparation technology of the precoated sand. The precoated sand has the advantages of high temperature and normal temperature strength, high deformation resistance, good formability, easy collapsibility, good mobility and low gas-forming amount, and completely meets the production technology requirements of an engine with complex structure and high performance.
Description
technical field [0001] The invention belongs to the field of casting, and in particular relates to a high-strength, deformation-resistant, easy-to-collapse coated sand and a preparation process thereof. Background technique [0002] Coated sand, the surface of the sand particles is covered with a layer of solid resin film before molding or core sand. There are two coating processes: cold method and hot method: the cold method dissolves the resin with ethanol, and adds urotropine during the sand mixing process, so that the two are coated on the surface of the sand grains, and the ethanol volatilizes to obtain coated sand; Preheat the sand to a certain temperature, add resin to melt, stir to coat the resin on the surface of the sand, add urotropine aqueous solution and lubricant, cool, crush, and sieve to obtain coated sand. It is mainly used in the production of various complex castings such as automobile cylinder blocks, cylinder heads, intake manifolds, various pipe fittin...
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Application Information
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