Method for casting turbocharger encloser casting
A technology of turbocharger and casing, which is applied in casting molding equipment, casting molds, casting mold components, etc., to achieve the effect of improving production efficiency and utilization rate
Active Publication Date: 2013-06-05
上海华新合金有限公司
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Problems solved by technology
No casting defects are allowed inside the product
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Embodiment 1
[0031] see figure 1 , figure 2 , the casting method of marine turbocharger casing casting of the present invention, comprises the steps:
[0032] 1) Sand mixing, molding and core making
[0033] Marine turbocharger casing castings are molded after mixing furan resin self-setting sand with an automatic sand mixer. The pattern plate is designed as four pieces of one type, and a completely symmetrical pattern plate layout is adopted, corresponding to four casting cavities 3; Below the sprue 4, there is a filter 5 of a ceramic filter net, which is connected to four completely symmetrical runners 6, and then connected to the casting cavity 3 through four thin-piece in-runners 7; each casting cavity 3 is opposite Two thermal insulation risers 8 are provided on the top end surface of the far-end side of the inlet of the casting ingate for feeding.
[0034] Place the thermal insulation riser 8 on the round gasket of the top plate before molding, then carry out sand filling, compac...
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Abstract
The invention discloses a method for casting a turbocharger encloser, comprising the following steps: mulling, molding, manufacturing cores, integrating, smelting furnace burden, tapping, nodulizing, inoculating, pouring, cooling, unpacking, cleaning castings and checking product quality; designing a template into one type comprising 2-8 piece; adopting a completely symmetrical template layout; correspondingly arranging two to eight casting cavities; and casting by the slice-type ingate distributed pouring technology: and after melted iron enters a direct pouring gate, the melted iron passes through a filter provided with a ceramic filter screen below the direct pouring gate, and flows into a horizontal pouring gate, and then the melted iron enters the casting cavity via the ingate to fill in the cavity, wherein the pouring temperature is 1380-1460DEG C, and the top end surface of a far-end side opposite to the ingate inlet of the casting in each casting cavity is provided with two heat-insulation dead heads for feeding. The tensile strength of the casting body is more than or equal to 400MPa, the yield strength is more than or equal to 250MPa, the percentage elongation is more than or equal to 15%, the body hardness is 130-180HBS, the metallographic structure ferrite is more than or equal to 90%, the percent of spheroidization is more than or equal to 90%, the size of graphite is 4-7 grades, and no carbide is permitted to exist.
Description
technical field [0001] The invention relates to a casting method, in particular to a casting method of a casing casting of a turbocharger. Background technique [0002] Turbine casing is a key part of marine turbocharger. Due to the harsh working environment of turbocharger, it is necessary to ensure that the internal high-temperature compressed gas is stored in the volute under extremely high pressure. Therefore, the material of the casing parts is required to be of good quality. Tissue compactness and high toughness. [0003] In response to the above requirements, the parts are specified to use the grade of ductile iron QT400-15. The mechanical properties of castings should meet tensile strength ≥ 400MPa, yield strength ≥ 250MPa, elongation ≥ 15%, body hardness 130 ~ 180HBS; metallographic structure requires ferrite ≥ 90%, spheroidization rate ≥ 90%, graphite size 4 ~ Grade 7, carbides are not allowed. Any casting defects are not allowed inside the product. The charact...
Claims
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IPC IPC(8): B22C9/24C22C33/08C22C33/10F02C6/12F01D25/24
Inventor 徐清
Owner 上海华新合金有限公司