Evaporative pattern casting coating and preparation method and using method thereof

A technology of lost foam casting and coating, applied in casting molding equipment, coating, mold and other directions, can solve problems such as insufficient strength, low work efficiency, cracking and even peeling

Active Publication Date: 2017-12-22
CHANGGAO ELECTRIC GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional lost foam casting coatings usually have the following problems: if the peelability is good, the strength is not high enough, and cracking or even peeling will occur during the drying process after coating and hanging, which makes the molding sand directly contact with high-temperature molten steel, eventually causing The product has serious sand inclusion or sticky sand; if its strength is high enough, the peelability will be poor, and the coating will be tightly attached to the casting surface after opening the box, which will increase the workload of the subsequent cleaning and polishing process, resulting in low work efficiency and production. rising costs

Method used

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  • Evaporative pattern casting coating and preparation method and using method thereof
  • Evaporative pattern casting coating and preparation method and using method thereof

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preparation example Construction

[0036] The preparation method of the lost foam casting paint is simple and quick, and the obtained lost foam casting paint has the characteristics of high strength and good stripping property in the coating formed in the lost foam casting process.

[0037] The present invention also provides a method for using the above-mentioned lost foam casting coating in an embodiment: mixing the above-mentioned lost foam casting coating with water at a weight ratio of 100:68-76, and then it can be used.

[0038] Specifically, the mixing condition is: stirring at a rotating speed of 500-600 rpm for 30-120 minutes, and then stirring at a rotating speed of 180-240 rpm for 20-40 minutes.

[0039] The applicant has found through research that factors such as water content, stirring speed and stirring time will affect various properties of the lost foam casting coating, such as high temperature strength, stripping property, suspending property, leveling property and coating property. Therefore,...

Embodiment 1

[0045] Under normal temperature and pressure, according to the composition and weight of the lost foam casting coating in Example 1 in Table 1, batching was carried out. The components are mixed and stirred thoroughly to obtain the lost foam casting coating. According to the weight of water in Example 1 in Table 1, add water to the lost foam casting coating, stir at a speed of 500 rpm for 120 minutes, and then stir for 40 minutes at a speed of 180 rpm to obtain the used lost foam casting coating . Apply the used lost foam casting paint evenly on the surface of the plastic foam model, then put the model in a 50°C drying oven to dry for 12 hours, repeat the above coating and drying steps twice, and then perform sand burying and vacuum pouring, Finally, the casting can be unpacked after cooling down.

Embodiment 2

[0047] Under normal temperature and pressure, according to the composition and weight of the lost foam casting coating in Example 2 of Table 1, batching was carried out. The components are mixed and stirred thoroughly to obtain the lost foam casting coating. According to the weight of water in Example 2 in Table 1, add water to the lost foam casting coating, stir at a speed of 600 rpm for 30 minutes, and then stir at a speed of 240 rpm for 20 minutes to obtain the used lost foam casting coating . Subsequent steps are the same as in Example 1.

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Abstract

The invention discloses evaporative pattern casting coating and a preparation method and using method thereof. The evaporative pattern casting coating comprises the following components of, by weight, 68-78 parts of refractory aggregate, 2-6 parts of hydroxyethyl cellulose, 3-6 parts of sodium bentonite, 4-7 parts of syrup, 2-6 parts of white emulsion and 2-5 parts of crystalline graphite powder. All the raw materials of the evaporative pattern casting coating are reasonably blended by weight, and the evaporative pattern casting coating has the characteristics of high strength and good stripping quality. The surface of an evaporative pattern casting prepared through the evaporative pattern casting coating is good in quality and free of sand inclusion or sand burning, the coating can be automatically stripped from the surface of the casting after the casting is unpacked, and the workload of later peeling-off and grinding of the casting is lowered.

Description

technical field [0001] The invention relates to the casting field, in particular to the lost foam casting coating and its preparation method and application method. Background technique [0002] Lost foam casting is to make plastic foam into a solid mold with the same or similar structure and size as the part to be cast. After brushing refractory paint and drying, it is buried in dry quartz sand for vibration molding, and poured under negative pressure. The model is gasified, the liquid metal occupies the position of the model, solidified and cooled to form a new casting method. Lost Foam Casting is a new technology with nearly no allowance and precise molding. The castings manufactured by this process have no flash, burr and draft angle, and the dimensional error is small, thus reducing the cost and time of later machining. In addition, lost foam casting uses binder-free dry sand molding, which reduces pollution and is considered to be the most likely technology for green...

Claims

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Application Information

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IPC IPC(8): B22C3/00B22C9/04
CPCB22C3/00B22C9/04
Inventor 张志高乔翔肖开元
Owner CHANGGAO ELECTRIC GROUP CO LTD
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