According to the actual size and casting process of crankshaft, the laboratory test is reasonably designed. The iron mold is designed with a length of 320mm, a width of 200mm and a height of 280mm. Two cavities of the same size are designed to facilitate the comparative experiment. The size of the sand core is designed according to the thickness of the sand shell, and a sand shooting hole with a diameter of 10mm is designed at the bottom of the mold, as shown in Figure 1. The physical object is shown in Figure 2.
Preheat the mold to 200 ° C before use to reach the hardening temperature of coated sand; When in use, turn the mold upside down, make the sand shooting hole face up (as shown in the right figure of Figure 2), and cover it with sand; After sand blasting, take out the core and turn the mold over to start pouring.
Simple sand blasting equipment is used in the laboratory, which is composed of a small sand blasting bottle and nitrogen cylinder, as shown in the left figure of Figure 3. The nitrogen cylinder can provide instantaneous high pressure, so that the coated sand in the sand blasting bottle can quickly fill the mold, heat up, bond and harden to form a sand shell. First preheat the mold and core to more than 200 ° C. after taking it out, align the sand outlet of the sandblasting bottle with the sand outlet of the iron mold. After adjusting the gas pressure to 0.6MPa, quickly open the air valve of the sandblasting bottle. The coated sand in the bottle quickly fills the gap between the mold and the core to form a 10mm thick sand shell to separate the mold and core, The sand shell after modeling is obtained as shown in the figure.
