Self-hardening core for precision casting and manufacturing method thereof
A precision casting and self-hardening technology, which is applied to casting molding equipment, casting molds, cores, etc., can solve the problems of inability to cast mold cavities, high casting scrap rate, and difficulty in guaranteeing casting quality, and achieve convenient shelling and sand cleaning of castings , Reduce the scrap rate, improve the effect of quality
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Embodiment 1
[0022] First select 35 parts by weight of silica sol, 25 parts by weight of mullite powder, 25 parts by weight of mullite sand and 1.8 parts by weight of lime. Wherein, the particle size of the mullite powder is 265 mesh, and the particle size of the mullite sand is 40 mesh.
[0023] Then, pour the silica sol into the container;
[0024] After that, put mullite powder and mullite sand together to form a mixture;
[0025] Afterwards, while stirring, pour the mixture into the container and mix it evenly with the silica sol;
[0026] Afterwards, add lime, continue to stir until uniform, obtain slurry;
[0027] Afterwards, the slurry is poured into the shell mold with a temperature of 20°C, and kept at a constant temperature of 20°C for 4.5 hours;
[0028] Finally, the shell mold is removed to obtain a self-hardening core for precision casting.
Embodiment 2
[0030] First select 39 parts by weight of silica sol, 30 parts by weight of mullite powder, 30 parts by weight of mullite sand and 2.0 parts by weight of lime. Wherein, the particle size of the mullite powder is 270 mesh, and the particle size of the mullite sand is 55 mesh.
[0031] Then, pour the silica sol into the container;
[0032] After that, put mullite powder and mullite sand together to form a mixture;
[0033] Afterwards, while stirring, pour the mixture into the container and mix it evenly with the silica sol;
[0034] Afterwards, add lime, continue to stir until uniform, obtain slurry;
[0035] Afterwards, pour the slurry into the shell mold with a temperature of 23°C, and keep it at a constant temperature for 5 hours at a temperature of 23°C;
[0036] Finally, the shell mold is removed to obtain a self-hardening core for precision casting.
Embodiment 3
[0038] First select 42 parts by weight of silica sol, 25 parts by weight of mullite powder, 25 parts by weight of mullite sand and 2.2 parts by weight of lime. Wherein, the particle size of the mullite powder is 275 mesh, and the particle size of the mullite sand is 70 mesh.
[0039] Then, pour the silica sol into the container;
[0040] After that, put mullite powder and mullite sand together to form a mixture;
[0041] Afterwards, while stirring, pour the mixture into the container and mix it evenly with the silica sol;
[0042] Afterwards, add lime, continue to stir until uniform, obtain slurry;
[0043] Afterwards, the slurry is poured into the shell mold with a temperature of 25°C, and kept at a constant temperature of 25°C for 5.5 hours;
[0044] Finally, the shell mold is removed to obtain a self-hardening core for precision casting.
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