The assembly of sand cores for complex auto parts is done manually on the assembly line supported by the roller table. Since the binders used in large quantities are materials such as paper pulp waste liquid and compound grease, the price is cheap, the core sand is easy to mix, and the performance of the sand core basically meets the needs of mass production of automobile castings. This was very advanced in the 1950s. However, the sand core must be dried, which undoubtedly increases energy consumption. Cast iron smelting Gray cast iron smelting uses 4 cold-air cupolas with a melting rate of 3t/h, which are divided into two groups of alternating furnaces, and form a double smelting system with an electric arc furnace with a capacity of 3t. The produced molten iron is poured into castings such as cylinder blocks, cylinder heads, gearbox housings, clutch housings and brake drums.
malleable cast iron smelting adopts two cold-air cupolas with different melting rates, and is equipped with two electric arc furnaces with a capacity of 5t to adjust the chemical composition of molten iron, and mainly produces malleable iron parts for the chassis. The sand processing system is centrally arranged in the sand processing department of the workshop. It uses 6 advanced Soviet-made balance wheel sand mixers at that time to supply molding sand for each of the gray cast iron and malleable cast iron molding production lines. General castings are made of single sand; important castings such as the cylinder block and rear axle housing are made of surface sand and back sand.
The mixed molding sand is uniformly modified by the intermediate storage and mixing hopper, and then sent to the sand hopper above the molding machine by a belt conveyor. The old sand after falling sand is transported by a belt conveyor, crushed by a drum screen, sieved, electromagnetic separation drum, etc. to remove the scrap metal in the sand, and then sent to the old sand bucket for reuse. After the clay and coal powder are crushed into powder by the ball mill dry method, they are sent to the hopper above the sand mixer and added to the sand mixer through a quantitative system; after the new sand is dried by the horizontal drying drum, it is sent into the new sand by the belt conveyor In the hopper.
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