Suzhou Xinsen Precision Casting Co.,Ltd
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    Add: No.238, Qiushe Road, Qiushe Industrial Park, Tongli Town, Wujiang District, Suzhou City, Jiangsu, 215200, P.R.China

    Tel: 86-512-63375886-608

    86-13732656777

    Fax: 86-512-63370558

    QQ: 502082393

    Email: szxsjm@sohu.com

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Silica Sol Casting Improve The Competitiveness Of Precision Casting Enterprises

Silica Sol  Casting has the advantages of high dimensional accuracy and good surface quality. It is a kind of advanced technology which is widely used and has no cutting. The method of Silica Sol Casting  can save a lot of machine tool equipment and processing time, but also save metal raw materials greatly. Silica Sol Casting is a widely used precision casting method in the field of precision casting. This precision casting method effectively reduces the cost and improves the competitiveness of precision casting enterprises. Casting is one of the most important steps in Silica Sol Casting. So what are the common casting methods for Silica Sol Casting?

1. Under pressure, the shell will be placed in the pressure tank for pouring, after the end of the closure of the pressure tank immediately, to the tank through the high pressure air or inert gas, so that the casting under pressure to solidify to increase the casting density The

2. Vacuum suction pouring, the shell on the vacuum pouring box, through the small holes in the shell to suck the gas in the cavity, the liquid metal can better fill the cavity, copy the shape of the cavity, Casting precision, to prevent stomata, pouring deficiencies. This method is more common in foreign countries.

3. Directional crystallization, some investment casting, such as turbine blades, magnets, etc., if their crystal structure is arranged in a certain direction of the columnar crystal, their work performance can be improved a lot, so the investment casting oriented crystallization technology is rapidly Get developed.

4. Hot-type gravity casting, which is the most widely used a pouring form, that is, shell removed from the roasting furnace, the high temperature by the casting.

At present, there are still some difficulties in the production of complex whole impeller casting. Therefore, the research on impeller casting technology, especially the research of coating technology, has always been a hot topic in the casting industry. As the shape of the complex structure, thin wall, leaf twist, so the casting is quite difficult. For a long time, for stainless steel impeller, are generally used in the form of investment casting production, the production of such a higher cost of casting, the production cycle is longer.

Typical impeller material for the CF-8, mechanical performance requirements: tensile strength of more than 485MPa, yield strength of more than 205 MPa, elongation of more than 35%. Narrow runner impeller diameter of more than 200 mm, the flow channel outlet size of 8 mm below the leaves 6 to 8, such as the impeller channel long and narrow, in the investment casting process before the process of paint and after the process is difficult to clean up. The initial use of all-welded to sub-casting and then to the current overall casting, through the user for several years compared to the current use of the overall casting of the impeller to run more reliable, more efficient, completely eliminate the welding stress. But the overall investment casting impeller in the paint process there is a lot of technical difficulty.

Silica Sol Casting easy to use, easy to dubbed high-quality liquid than the high-quality paint, paint stability. Shell manufacturing without chemical hardening, the process is simple, the system shell high temperature performance, high shell high temperature strength and high temperature resistance. But the Silica Sol Casting coating wax mold wetting is poor, need to add surfactant to improve the coating coating. In addition, the Silica Sol Casting-type shell drying speed is slow, shell wet strength is low, shell length is long. Because the Silica Sol Casting shell is not long during storage, it is suitable for surface coating and surface inoculant coating, it can make the surface inoculants play a good role in the surface grain refinement of the castings. All-Silica Sol Casting-type shells, as well as Silica Sol Casting to do the surface layer of ethyl silicate do back layer of composite shell has been widely used in the production. Silica Sol Casting is a water-based binder, no shell when the air pollution, more and more stringent environmental requirements today, the application of such adhesives has an upward trend.

Silica Sol Casting shell drying is mainly through the Silica Sol Casting dehydration to form a network of colloids. At the beginning of the drying, the moisture on the surface of the shell is evaporated first, and the moisture inside the shell moves to the surface by capillary action. As the drying continues, the moisture in the coating layer evaporates continuously, and the concentration of Silica Sol Casting in the binder increases, Of the contact surface of the occurrence of silanol condensation reaction, the formation of a solid silicone oxygen bond and lead to gel. The main factors affecting the drying of Silica Sol Casting shell are ambient temperature, ambient humidity and wind speed. According to the actual experience: the surface coating should be no wind drying, drying time 5 ~ 8 h, humidity control between 60% to 70%, too short time shell is not fully dry, too long surface type shell easy to crack. The transition layer coating and the back paint should be ventilated and dry, the wind speed is controlled at 5 ~ 8 m / s, the wind should be the rotating wind, can not blow to the module. Humidity should be controlled between 50% to 60%, too low humidity can cause shell cracking, humidity is too large to cause the shell to dry slowly, drying time should usually be greater than 8 h.


Contact Us
Address: No.238, Qiushe Road, Qiushe Industrial Park, Tongli Town, Wujiang District, Suzhou City, Jiangsu, 215200, P.R.China
Tel: +86-512-633758+86-608
 Fax:86-512-63370558
 E-mail:szxsjm@sohu.com
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