A core-making process to reduce hindered shrinkage
A process and sand core technology, which is applied in the field of core-making process to reduce hindered shrinkage, can solve problems such as unusable, reduced precision and strength of castings, harmful to human body and environment, etc., to improve yield, save sand, and reduce consumption Effect
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Embodiment 1
[0021] Embodiment 1: when producing the steel castings whose material is ZG20Mn, first weigh a certain volume of monoclinic zirconia particles, then weigh the same volume of water glass sand, pour the two into a sand mixer and mix evenly; Fill in new water glass sand to make it evenly cover the core box. According to the size of the casting, the thickness of the surface sand layer is 30-50 mm; then fill in the uniformly mixed monoclinic zirconia particles Fill in water glass sand, the thickness of the retreat layer depends on the size of the casting; the rest of the core box is filled with recycled and regenerated water glass sand. After the water glass sand is hardened, disassemble the core box, take out the sand core, and assemble it in the casting In the mold, to be poured. Above-mentioned water glass sand also can change into furan resin sand.
[0022] Zirconium dioxide is monoclinic crystal form below 1200°C. When the temperature exceeds 1200°C, the crystal form of zirco...
Embodiment 2
[0023] Embodiment 2: When producing aluminum castings made of ZL114A, first weigh a certain volume of zirconium tungstate particles, then weigh the same volume of furan resin sand, pour it into a mixer and mix evenly, and the rest of the steps are the same as in Example 1. Tell me more.
[0024] Zirconium tungstate has negative thermal expansion characteristics in the temperature range from -272.7°C to 777°C, while the solidification range of ZL114A is about 560-620°C, and its pouring temperature is generally about 700°C; the molding is generally completed at room temperature, when tungsten Zirconium oxide particles are added to the sand core to form a concession layer, and the temperature of the entire sand core increases during pouring, and the volume of the zirconium tungstate particles shrinks relative to room temperature, creating gaps in the sand core to reduce the hindered shrinkage of the molten metal; The liquid solidifies and the temperature of the sand core drops, b...
Embodiment 3
[0025] Embodiment three: as figure 2 As shown, mix a certain volume of monoclinic zirconia particles with the same volume of furan resin sand, and then evenly cover the core box with new furan resin sand to form a surface sand layer with a thickness of 40 mm, and then fill in The mixed sand of zirconia particles and furan resin sand forms a concession layer of 120 mm. Finally, the old sand of recycled and regenerated furan resin sand is used as the back sand to fill the core box to make a total radius of 300 mm and a height of 300 mm. 600 mm sand core.
[0026] According to the calculation, the total volume of the sand core is about 16.96×10 7 mm 3 , where the surface sand layer volume is about 4.22×10 7 mm 3 , The volume of the concession layer is about 9.05×10 7 mm 3 , the volume of the back sand layer is about 3.69×10 7 mm 3 , because in the concession layer, the volumes of zirconia particles and furan resin sand are the same, the total volume of the new sand is 8....
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