Method for investment casting of chromium bronze casting in vacuum environment
A vacuum environment, investment casting technology, applied in the direction of casting molding equipment, casting molds, casting mold components, etc., can solve the problems of easy oxidation of chromium, high viscosity, poor fluidity of chromium bronze melt, etc., and achieve the effect of improving quality
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[0031] The first step: making investment mold. Make wax molds according to the product—wax pattern making—welding combination wax pattern—coating mold shell—dewaxing—baking mold shell.
[0032] The second step: making copper-chromium master alloy. The electrolytic copper and metal chromium are prepared in a ratio of 50:3, put into the crucible, and melted in a vacuum environment for more than four hours.
[0033] The third step: making graphite crucible. According to the capacity of the vacuum furnace, graphite rods with corresponding diameters and lengths are used to process graphite crucibles with certain shapes and sizes. After the crucible is completed, a tapered hole is added to the bottom of the crucible.
[0034] Step 4: Protect the crucible. Brush the inner wall of the crucible with graphite water or paste graphite paper, and then put it into an oven to dry (the temperature is set at 200°C, and the heat preservation is suitable for 2 hours).
[0035] Step 5: Make ...
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