Green sand for high-density molding of iron castings and its preparation method
A green sand, high-density technology, used in casting equipment, molds, cores, etc., can solve the problems of poor comprehensive performance, high price, affecting the quality of castings, etc., to improve fluidity, low manufacturing costs, and ensure comprehensive Effects of performance and quality stability
Active Publication Date: 2020-07-17
SHANGHAI SPACE PRECISION MACHINERY RES INST
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Problems solved by technology
At present, the green sand used for high-density molding of iron castings on the market has disadvantages such as poor comprehensive performance and high price, which seriously affects the quality of castings
Method used
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Embodiment 1
[0026] This embodiment relates to a green sand for high-density molding of iron castings, which is made of the following raw materials in parts by weight: bentonite 0.5-2, mixed soil 0.2-1 (the mixed soil is composed of high-efficiency coal powder 70-85, bentonite 10-25, alkalized lignite 2-5, asphalt 3-5, alpha starch 2-5), quartz sand new sand 0-5, quartz sand old sand 95-99, water balance.
[0027] A method for preparing green sand for high-density molding, comprising the following steps:
[0028] (1) The old sand of quartz sand has been treated by screening, magnetic separation, water replenishment, cooling, and sand awakening to ensure that the water content of the old sand is kept at 60-70% of the water content of the molding sand before mixing, preferably at 1.5-2.5%, such as molding sand The moisture requirement is 3.2%, and the moisture content of the old sand is stable at 1.92-2.24%. The sand temperature of the old sand is not higher than room temperature by 15°C, a...
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Abstract
The invention discloses wet moulding sand used for iron casting high density molding and a preparation method of the wet moulding sand. The wet moulding sand is made of the following raw materials of,by weight, 0.5-2 parts of bentonite, 0.2-1 parts of mixture soil (the mixture soil is composed of 70-85 parts of efficient pulverized coal, 10-25 parts of bentonite, 2-5 parts of alkaline lignite, 3-5 parts of asphalt, and 2-5 parts of alpha-starch), 0-5 parts of quartz sand new sand, 95-99 parts of quartz sand old sand, and the balance water. The wet moulding sand used for iron casting high density molding not only has high compression strength and wet-heat tensile strength, and further has excellent breathability, liquidity and surface drying; the moulding sand preparation technology is simple, the construction cost is low, and the wet moulding sand used for iron casting high density molding is suitable for large-scale popularization and application in high density molding.
Description
technical field [0001] The invention relates to green molding sand for high-density molding of iron castings and a preparation method thereof, belonging to the technical field of molding sand. Background technique [0002] At present, high-density molding such as high-pressure molding, air blasting, extrusion, injection pressure, static pressure and other molding production lines all use clay green sand as their molding sand, and the quality of green sand directly affects product quality. Therefore, controlling the quality of green sand is very important to mass production molding production lines. [0003] Sand casting is the most common casting method. Green sand is the most important molding material in the current molding process because of its low production cost and high efficiency. The quality of molding sand directly affects the surface quality of castings and casting defects such as sand holes, pores, sand inclusions, rat tails, and grooves. Most of the waste prod...
Claims
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IPC IPC(8): B22C1/00B22C1/02
CPCB22C1/00B22C1/02
Inventor 张娜刘颖卓迟秀梅张旭亮崔恩强
Owner SHANGHAI SPACE PRECISION MACHINERY RES INST