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Coating for lost foam casting, and preparation method thereof
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A lost foam casting and coating technology, which is applied to casting molding equipment, coatings, molds, etc., and can solve problems such as high cost and poor coating performance
Active Publication Date: 2014-01-15
ZOOMLION HEAVY IND CO LTD
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[0004] Generally, the requirements for coatings for lost foam casting are sufficient refractoriness, certain air permeability, good adhesion and coating properties, etc., especially in the lost foam casting of cast iron workpieces, due to the high pouring temperature, so for There are higher requirements for the refractoriness of coatings, but the existing coatings have the disadvantages of poor performance or high cost
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preparation example Construction
[0036] In addition, the present invention also provides a preparation method of the above-mentioned coating for lost foam casting, the preparation method comprising:
[0037] Step 1, mixing quartz sand and bauxite to obtain refractory aggregate, wherein the weight ratio of quartz sand to bauxite is 3:7 to 4:6;
[0038] Step 2, adding water to the refractory aggregate and stirring; and
[0039] Step 3, adding suspending agent and binder to the mixture of refractory aggregate and water and stirring.
[0040] Wherein, the time for stirring and mixing quartz sand and bauxite in step 1 can be determined according to actual conditions, and it is a standard to mix quartz sand and bauxite as fully as possible. Usually, the time for stirring in step 1 The time is 5min-10min; similarly, the time for stirring in step 2 can also be determined according to the actual situation, so that the quartz sand and bauxite are dispersed in water as uniformly as possible as a standard, usually, the ...
Embodiment
[0051] Coating samples 1-8 for lost foam casting were prepared according to the following steps, respectively:
[0052] Step 1. Stir and mix the components of the refractory aggregate. The components and proportions and average particle size of the refractory aggregate in samples 1-8 are shown in Table 1. During the preparation process of samples 1-8, carry out The time of stirring is shown in table 4 respectively;
[0053] Step 2: Add water to the refractory aggregate and stir, wherein the weight ratios of water and refractory aggregate in samples 1-8 are shown in Table 1, and the time of stirring during the preparation of samples 1-8 is in step 2 The time for stirring is shown in table 4 respectively; and
[0054] Step 3. Add binder and suspending agent to the mixture of refractory aggregate and water and stir, the type of binder in sample 1-8 and its ratio with refractory aggregate, and the suspending agent in sample 1-8 The types of the samples and their proportioning ra...
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Abstract
The invention discloses a coating for lost foam casting and a preparation method of the coating. The coating comprises the following components: a refractory aggregate, a binder, a suspending agent and water, wherein the refractory aggregate comprises quartz sand and bauxite, and the weight ratio of quartz sand to bauxite is 3:7 to 4:6. The preparation method comprises the following steps: step 1, stirring and mixing the quartz sand and the bauxite to obtain the refractory aggregate, wherein the weight ratio of the quartz sand to the bauxite is 3:7 to 4:6; step 2, adding water into the refractory aggregate and stirring, wherein the weight ratio of the water to the refractory aggregate is 0.7 to 0.9; step 3, adding the binder into the mixture of the refractory aggregate and water and stirring. According to the invention, the coating has better performance and lower cost and is particularly suitable for lost foam casting of cast iron workpieces.
Description
technical field [0001] The invention relates to the field of lost foam casting, in particular to a coating for lost foam casting and a preparation method thereof. Background technique [0002] The lost foam casting technology is to bond and combine foamed plastic models similar in size and shape to the castings to form a model cluster, paint and dry to form a refractory coating on the surface of the model, and bury it in dry quartz sand for vibration molding. The method of pouring liquid metal, vaporizing the model and occupying the position of the model, solidifying and cooling to form the required casting. [0003] Lost foam casting is a precision-shaped casting process. The surface finish of the castings produced by this casting process is much higher than that of traditional clay sand casting and sand casting. However, the process control of lost foam casting is complex and requires raw and auxiliary materials. Strict, for example, the selection of coatings is a key par...
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