Negative-pressure vacuumizing pouring method for high-pressure regulating valve casting

• Main Authors: LI PENG, GAO HAO, WANG JIANPENG, SHI MODONG, MA YING
• Format: Patent
• Language: Chinese; English
• Published: 29.01.2021
• Subjects: CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING

The invention discloses a negative-pressure vacuumizing pouring method for a high-pressure regulating valve casting. The method includes the following steps that S1, a sand mold is closed and put intoa tool which is a box body with an opening formed in the upper end, an air suction cavity is formed in the lower end of the box body, and the air suction cavity is separated from the box body througha filter screen; S2, the space between the box body and the sand mold is filled with dry sand; S3, after the spaced is full of the dry sand, plastic is laid at the upper end of the box body, and thedry sand is laid on the plastic; S4, a vacuum pump is started, and the air suction cavity is vacuumized; S5, pouring is conducted in the sand mold, and the vacuum pump is kept to be started; and S6, after pouring is completed, the vacuum pump is stopped. According to the method, the pouring speed is increased, the mold filling time of the high-pressure thick-wall casting is shortened, the qualityof the casting is further im