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Silica Sol Casting To Improve The Quality Of Castings, Reduce Costs And Improve Productivity

Silica Sol Casting Formulation Sand - Molding - Type - Casting - Cooling - Sanding - Cleaning - Inspection - Heat Treatment - Inspection - Get Castings

Features: The use of sand molding and casting methods,Silica Sol Casting usually refers to the sand under the gravity of the casting process.

Modeling (core) method according to the degree of mechanization can be divided into hand-shaped (core) and machine modeling (core) two categories.

Choosing the right mold (core) method and the correct shape (core) process operation is of great importance to improve the quality of castings, reduce costs and improve productivity.

And the quality of the general shape to meet the technical requirements, so far, in a single, small batch production of the casting workshop, hand shape (core) still accounts for a large proportion. In the aviation, aerospace, marine applications widely. Handmade (core) labor intensity, low productivity,Silica Sol Casting casting quality is not easy to stabilize, to a large extent depends on the technical level of workers and proficiency. Hand shape a lot of methods, such as modeling shape, scraper shape, pit shape, a variety of modeling methods have different characteristics and application range.

(2) machine modeling (core) with the machine to complete all or part of the modeling process, known as the machine shape, compared with the hand shape, machine modeling production efficiency,Silica Sol Casting quality, low labor intensity, the technical requirements of workers As high as the production preparation time is long, generally applicable to a two-box shape of the two sides. Machine shape (core) is mainly applied to the mass production of ferrous metal castings.

Casting production of quartz sand used in construction and sand,Silica Sol Casting it has its special requirements, mainly: mud content; particle composition; the original sand particle shape and surface conditions; the original sand mineral composition and chemical composition.

Production is usually based on the type of alloy casting, quality, wall thickness to select the original composition of the original composition of the sand and minerals. For example, the casting temperature of cast steel is as high as about 1500 ℃, the carbon content of molten steel is low, the lack of strong reducing atmosphere in the cavity can prevent the metal from oxidizing. The metal on the interface with the mold is easy to oxidize to form FeO and other metal oxides So that it is easier to react with the impurities in the sand to cause chemical sticky sand. So the requirements of the original sand Si02 content should be high, harmful impurities should also be strictly controlled. The higher the pouring temperature of the cast steel, the thicker the wall thickness,Silica Sol Casting the higher the requirement for the Si02 content in the original sand.

Cast iron pouring temperature is generally below 1400 ℃, iron liquid contains more carbon, wet pouring sand by adding coal and other additives, can produce a large number of reducing atmosphere, in contact with the mold on the interface of the basic metal No oxidation, in fact, no wet chemical cast iron sand phenomenon.

The sintering point refers to the temperature at which the mixture of the original sand particles or between the sand particles begins to melt. It is the original sand of various combinations of components of the comprehensive performance of fire resistance. Therefore,Silica Sol Casting sometimes the use of the original sand sintering point method can more intuitively explain the original sand as a refractory properties, and can be used to speculate the original sand content of SiO2 content and impurities. Feldspar, mica and its impurities contained in the alkali metal oxides (Na20, K20), alkaline earth metal oxides (CaO, MgO) and Si02 and iron oxide can produce fusible material. Such as a mixture of Si02 and NaO at a mass ratio of 73:27, having a melting point of only 793 ° C. K2O and SiO2 can form a melting point of only 525 ℃ low melting, low sintering point.

Silica sand Disadvantages: thermal expansion coefficient is relatively large, and at 573 ℃ due to phase change will produce a sudden expansion casting if crack; thermal diffusivity is relatively low; easy to work with iron oxides. These will have an adverse effect on the interface between the mold and the metal. In the production of high-alloy steel castings or large cast steel, the use of silica sand sand, castings prone to sticky sand defects, so that casting sand is very difficult.

Non-quartz raw sand refers to the original composition of the mineral does not contain or only a small amount of free Si02 original sand. In the production of cast steel has been gradually using some non-quartz original sand to the preparation of inorganic and organic chemical binder sand, core sand or paint. Most of these materials have higher refractoriness, thermal conductivity, thermal diffusivity and heat storage coefficient than silica sand, with low coefficient of thermal expansion and uniform expansion, no volume mutation, and low reactivity with metal oxides , Can get the surface of high quality castings and improve the sand working conditions. But some of these materials in the higher prices, more scarce, it should be a reasonable choice.

The sand is a stable part of the igneous rock, the main component of silica (SiO2) and a small amount of impurities (Na, k, Ca, Fe and other oxides). SiO2 contains high sand, said quartz sand, a high melting point, 1700 ℃, Mohs hardness of 7 (generally the material is divided into 10, including talc 1, diamond 10),Silica Sol Casting with the inclusions increase , Its refractoriness decreased, SiO2 content is high, sand color close to colorless and transparent, generally with quartz sand white and slightly gray.

Casting production of quartz sand used in construction and sand, it has its special requirements, mainly: mud content; particle composition; the original sand particle shape and surface conditions; the original sand mineral composition and chemical composition.

Production is usually based on the type of alloy casting, quality, wall thickness to select the original composition of the original composition of the sand and minerals. For example,Silica Sol Casting the casting temperature of cast steel is as high as about 1500 ℃, the carbon content of molten steel is low, the lack of strong reducing atmosphere in the cavity can prevent the metal from oxidizing. The metal on the interface with the mold is easy to oxidize to form FeO and other metal oxides So that it is easier to react with the impurities in the sand to cause chemical sticky sand. So the requirements of the original sand Si02 content should be high, harmful impurities should also be strictly controlled. The higher the pouring temperature of the cast steel, the thicker the wall thickness, the higher the requirement for the Si02 content in the original sand.


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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
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 E-mail:szxsjm@sohu.com
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