A complete hub-shaped cavity is obtained by iron mold sand coating process, and the next sand core is used to directly cast the hub parts. The cast castings eliminate the defects of shrinkage porosity and shrinkage cavity in the hub, and the cast hub has stable quality and compact internal structure, which effectively improves the appearance and internal quality of the castings and reduces the rejection rate of the castings. Compared with clay sand casting, the weight of the cast castings is reduced by 10%, which greatly improves the production efficiency and saves a lot of time, manpower, equipment and other costs.
The invention relates to a casting method of a heavy truck hub, which is characterized in that the casting method adopts an iron mold sand coating process for casting, and specifically comprises the following steps:
(1) Design a set of models with the same shape as the hub of a heavy truck as the master model;
(2) Design and manufacture a set of core box consistent with the hub cavity of heavy truck;
(3) making an iron mold shape associated with the master mold, wherein the gap between the iron mold shape and the master mold is 5-7 mm;
(4) fixing the core box in step (2) on a core making machine, heating to 170-200 DEG C, closing the mold, clamping the sand shooting plate in place, and shooting sand.

(5) fixing the master mold on a sand shooting machine, heating to 230-270 DEG C, closing the shape of the iron mold, clamping the sand shooting plate in place, then shooting sand and curing for 25 seconds;
(6) shooting the coated sand onto the pre-designed iron mold shape through the sand hole of the sand shooting machine, so that the coated sand fills the cavity between the mold and the iron mold shape, and after 30 seconds, forming the mold, and naturally cooling for 25-30 seconds, the upper and lower iron mold shape cavities coated with sand are obtained in turn, and the sand cores are lowered to the corresponding positions, so that the box can be closed and poured;
(7) raw materials mainly made of pig iron and scrap steel are mixed and then put into a smelting furnace for heating, and the temperature of molten iron is 1530 DEG C;
(8) spheroidizing the molten iron by using a flushing method;
(9) After the box is closed, clamped and fixed, the treated molten iron is poured, the pouring time is 8 minutes, and the pouring temperature is controlled at 1330-1430 DEG C, so that the required nodular cast iron hub blank parts are obtained, and the castings are taken out of the box after heat preservation for 12 minutes.