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injection casting
injection casting

      The so-called injection casting process requires only fusible materials (such as wax or plastic) Make a fusible model (such as a mold or model), apply a few layers of special refractory paint, and dry it. The hardened to form a unitary casing, the model is melted from the casing by steam or hot water, and then the casing is placed in a flask and filled with dry sand around it, and finally the mold is placed in the furnace. High temperature baking (if a high-strength type shell is used, the mold can be directly fired without demolding), the mold or the casing is fired, and molten metal is poured therein to obtain a casting.

       In the case of a mold, a molded article having a high cavity surface finish is used, and therefore, the surface finish of the investment mold is also relatively high. The surface finish of investment castings is higher than that of conventional precision castings, generally reaching Ra.6.6~3.2μm. The biggest advantage of investment casting is that only a small amount of machining allowance is required on the part due to the height and dimensional accuracy of the investment casting. Some castings can only be polished and polished. Another advantage of the investment casting method is that it can accurately cast complex castings of various alloys, especially for precision casting of high temperature alloy castings. For example, the blades of a jet engine, its streamlined profile and cooling cavity can hardly be formed by machining. The production of investment casting precision casting process can not only achieve mass production, but also ensure the consistency of castings and avoid the stress concentration of residual tools after machining.

 

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