Method for controlling solidification of investment casting magnesium alloy casting and investment casting method
An investment casting and magnesium alloy technology, which is applied in the field of investment casting and controlling the solidification of investment casting magnesium alloy castings, can solve the problems of poor feeding effect of the riser, coarse casting structure, and low mechanical properties, so as to avoid pouring Insufficient, small grain size, excellent mechanical properties
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[0048] In some specific embodiments of the present invention, the preparation method of the silicon carbide cooling element includes the following steps:
[0049] a. Grind 75 parts of silicon carbide (250 mesh) and 7 parts of powdered potassium fluoride in a ball mill for 5 hours to obtain a mixed powder, and melt the wax (17 parts of paraffin and 1 part of beeswax) into wax liquid at 110 °C , slowly add the above-mentioned mixed powder to the above-mentioned wax liquid, and stir during the adding process until a paste-like mixture is obtained; put the above-mentioned paste-like mixture into a core press, and press it into a green embryo.
[0050] b. After cooling the green embryos for 24 hours, put them in a pot, coat the green embryos with 300-mesh aluminum oxide, and bake them at 1100° C. for 8 hours to obtain billets.
[0051] c. The above-mentioned billet is subjected to high temperature strengthening treatment and low temperature strengthening treatment in sequence to ob...
Embodiment 1
[0060] The method for controlling the solidification of investment casting magnesium alloy castings provided by this embodiment includes the following steps:
[0061] A. Add perlite (particle size is 20±5 mesh) at the transition layer position of the mold shell corresponding to the part of the casting whose thin wall thickness is less than 5mm;
[0062] B. Use bonding wax to bond the silicon carbide cooling element to the position of the mold shell corresponding to the thick wall part of the casting (the outer wall of the wax film of the mold shell);
[0063] C. Brush a layer of ceramic glaze SAMYO SCG-607 with a thickness of 0.25mm on the outer surface of the riser and the feeding runner;
[0064] D. Pour the alloy into the mold shell. After the casting is completed, when the temperature of the mold shell is 500 ° C, the entire mold shell is put into the quenching oil U8132 for oil quenching, and the oil quenching time is 5min.
[0065] Wherein, the preparation method of sil...
Embodiment 2
[0070] The method for controlling the solidification of investment casting magnesium alloy castings provided in this embodiment refers to Embodiment 1, the only difference is that: in step C, brush a layer of 0.2mm thick film on the outer surfaces of the riser and the feeding runner. Ceramic glaze SAMYO SCG-607; in step D, the alloy is poured into the mold shell, after the casting is completed, when the temperature of the mold shell is 550 ℃, the entire mold shell is put into the quenching oil U8132 for oil quenching, oil quenching The time is 30min.
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