Take the sand mold casting of water and electricity ring as an example, its internal cavity contour size is about φ 4000 mm. On the premise that the sand volume and thickness are qualified during sand casting, eight 1000 mm standard block tooling can be used for a single layer to form a standard block octagonal assembly, which can be installed in three layers, a total of 24, as shown in the figure.
4-octagonal assembly of standard block tooling
During quicksand molding, the sand mold casting model shall be placed first, and the sand box shall be placed outside. Each layer of sand box (500 mm high) shall be placed, and a layer of standard block regular octagonal assembly (500 mm) shall be placed in the inner cavity of the model. The external resin sand shall be compacted. The sand inside the tooling shall be dried or the square steel shall be used to strengthen the support inside, without quicksand. The shape and size of each layer of standard block assembly can be adjusted according to the actual size of the sand mold casting, so that the molding process can be completed layer by layer, In order to save the amount of resin sand inside the tooling, a small triangular tooling of 800 mm can also be assembled, and other parts can be filled according to the above method to save the amount of sand. For molding sand without resin and curing agent, foundry enterprises are equipped with sand recovery and recycling device. The sand can be recycled and recycled, but the internal resin and curing agent must be mixed again. Therefore, the cost of molding sand is mainly the cost of resin curing agent, and dry sand is not included in the cost.
With φ 4 600 mm × For example, the use of standard block tooling can reduce the amount of resin sand by 21 t and the iron-sand ratio from 13 to about 11. 600 mm high; Use tower type φ 400 mm riser, H1 height 400 mm, H2 height 175 mm; The distance between the hot spot and the sand casting surface is the farthest from L1, and the distance between the shrinkage and the sand casting is the farthest from L2, and the modulus ratio is 1.18; The height-neck ratio is 1 ∶ 2; The cost decreased by 7% and the riser weight decreased by 11%.