Low-pressure precision casting method for magnesium alloy thin-wall shell part

• Main Authors: LIU QING, CHEN RONGSHI, WU JUNWEI, YAN HONG, HOU DANHUI, HAN ENHOU
• Format: Patent
• Language: Chinese; English
• Published: 05.04.2022
• Subjects: CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; FOUNDRY MOULDING; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING

The invention discloses a low-pressure precision casting method for a magnesium alloy thin-wall shell part, and belongs to the field of non-ferrous metal part casting methods. According to the method, through wax mold manufacturing, sand hanging and sintering, a mold shell with a high surface quality, high size precision and an internal complex structure is obtained, a magnesium melt is prevented from reacting and oxidizing with the mold shell by internally brushing a coating, and the surface quality is guaranteed; then, a pouring scheme is designed, and key process parameters such as low-pressure casting mold filling time and crystallization pressure are reasonably controlled in combination with a mold shell heat preservation measure, an anti-oxidation measure and a filtering device, so that stable flowing and anti-oxidation of a melt in the rising and mold filling process, in-place mold filling under the pressure condition and feeding in the solidification process are ensured; the internal metallurgical qua