Casting device and method for precoated sand stacking type product

Abstract

The invention discloses a casting device and method for a precoated sand stacking type product. The casting device comprises a casting frame; the casting frame comprises a sprue cup, a straight pouring gate and a plurality of parallel casting layers; the sprue cup is arranged on the top of the casting frame; the straight pouring gate communicates with the sprue cup; at least a flow dividing transverse pouring gate located on the bottommost layer is included, and the flow dividing transverse pouring gate forms a flow guiding segment; during casting, the flow guiding segment is used for guidingcasting liquid at the bottommost layer to flow to an upper casting layer; the two sides of the flow guiding segment are correspondingly connected with the straight pouring gate and the transverse pouring gate; the transverse pouring gate forms the plurality of casting layers; each casting layer is provided with a plurality of inner sprues, and each inner sprue is connected with a to-be-cast casting; and the height of the casting frame is 800-1000 mm. The casting device makes casting start from the bottommost layer, the casting efficiency is improved, meanwhile, due to the casting manner, the flowing direction of molten iron is controllable, and cold insulating defects are reduced.

Description

technical field [0001] The invention belongs to the technical field of pouring, and in particular relates to a pouring device and a pouring method for coated sand products. Background technique [0002] In the prior art, small products of coated sand generally adopt horizontal stacked pouring. Refer to attached Figure 1-2 As shown, the process method of this method is that the order in which molten iron enters the cavity is: sprue cup 1--sprue 2--runner 5 (entering at the same time, the flow rate is uncertain)--ingate 6 (simultaneously entry, indeterminate flow rate) - castings (simultaneous entry, indeterminate flow rate). [0003] After the above-mentioned existing technology adopts stacking, there are the following disadvantages due to the increase in the number of casting layers. [0004] 1) The more layers of pouring, the more runners are needed. For example, the stack height of SLDEI6-8 block produced by the company is 26 layers, and 26 runners are needed. At this ...

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Problems solved by technology

At this time, due to the large number of runners, the flow rate into each runner is uncertain, so that the product process yield cannot be improved

[0005] 2) The number of pouring layers is large, and the order in which the poured molten iron enters the casting cavity is not filled layer by layer

In this way, the flow rate and speed of molten iron entering the casting cavity are uncontrollable, and some casting cavity will enter part of the molten iron first, and the subsequent molten iron cannot be replenished in time, causing the molten iron to stop flowing, forming cold shut defects

[0006] 3) Because of the large number of runners and the large proportion, more molten iron is used to pour the same number of castings, and the relative weight of the whole bundle of products is larger, so the heat dissipation conditions of the products are worse, and nodular cast iron products are prone to spheroidal recession

[0007] 4) Due to the thickness of the sand shell (30-40), the height of the feeding riser of the casting is limited, the feeding effect of the product is relatively poor, and shrinkage defects are prone to occur

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