Composite shaping technique method of iron pattern coated sand and iron type core assembly

[0015] The iron mold sand-covered and iron mold core composite molding process for casting ductile iron parts includes the following steps: A. Make the upper mold of the part casting mold: set the iron mold of the part heated to 210 °C outside the electric heating pattern of the part, and the electric heating pattern of the part Heat to 210°C; use a sand-coating machine to inject the coated sand between the iron mold of the part and the electric heating pattern of the part. The sand-injecting pressure of the sand-coating machine is 0.35MPa, the sand-injecting time is 3 seconds, and the heating and curing temperature is 210°C. The heating and curing time is 12 seconds, and the coated sand is solidified into a sand shell with a thickness of 6 mm to 8 mm and adhered to the inner wall of the iron mold of the part; the mold is lifted, the electric heating pattern of the part is taken out, and trimmed to obtain the upper mold of the part; B 1. Make the coated sand core of the part: inst

[0018] The iron mold sand-covered and iron mold core composite molding process for casting ductile iron parts includes the following steps: A. Make the upper mold of the part casting mold: set the iron mold of the part heated to 240 °C outside the electric heating pattern of the part, and the electric heating pattern of the part Heat to 240°C; use a sand-coating machine to inject the coated sand between the iron mold of the part and the electric heating pattern of the part. The sand-injecting pressure of the sand-coating machine is 0.35MPa, the sand-injecting time is 6 seconds, and the heating and curing temperature is 240°C. The heating and curing time is 15 seconds, and the coated sand is solidified into a 6 mm to 8 mm thick sand shell that sticks to the inner wall of the iron mold of the part; B. Make the coated sand core of the part: install the electric heating core box of the part on the core shooting machine, and close the mold; heat the electric heating core box of the par