Sand mold casting technology of large bearing pedestal

Large bearing pedestals are used in power plants, petrochemical, metallurgy, shipbuilding and equipment manufacturing industries, such as steam turbine rotor support pedestals in nuclear power equipment, blade support pedestals of hydropower units and wind turbines, support pedestals of large rolling mills, etc. whether these high-quality large bearing pedestals can be manufactured is of great significance to the quality, quality and quality of national key engineering projects Safety and progress have a direct impact on the national economy and the people’s livelihood. This paper discusses the casting process design and process optimization of sand casting steel castings for mass production of bearing pedestal.

The bearing seat belongs to a large sand casting steel casting. The outline dimension of the part is 2 486 mm × 1 639 mm × 1340 mm, with a main wall thickness of 50 ~ 254 mm. It is a large thick walled part with a hollow rectangular shape, and the machining surfaces of the parts are all at the thin wall. After the machining allowance is placed, the wall thickness difference of each part is still large, and the sand casting process is difficult. The UG software is selected for modeling. In the UG modeling environment, firstly, the datum plane is established, and the position relationship between each part is determined according to the drawing. Then, the three-dimensional solid model of the bearing seat is completed by commands such as stretching, difference and edge rounding. The shape of the bearing seat is shown in the figure.

For the bearing pedestal produced in batch, a set of sand casting process scheme for producing the bearing pedestal is obtained by using the sand casting method, and the solidification process simulation and process optimization of the bearing pedestal are carried out by using Huazhu CAE software. It is concluded that the sand casting process scheme has certain guiding significance for the actual production.

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