Sand casting gating systems focus on slag removal and buffering the molten metal flow, such as using a filter gate cup;
gravity casting (metal mold) gating systems emphasize smooth mold filling and reducing porosity, such as tangential gates, and the molds are reusable, resulting in higher production efficiency.
Sand casting gates typically use an open design to facilitate slag removal and buffer the molten metal flow, such as a filter gate cup that effectively filters impurities; gravity casting often uses a closed gate system (such as a tangential gate) to reduce oxidation and porosity. The pouring temperature in sand casting is generally 50-100℃ lower than in metal mold casting because sand molds have better heat retention.
What are the cost differences between the two casting methods?
The cost differences between sand casting and metal mold casting mainly lie in the molds, materials, production efficiency, and post-processing:
Molds: Sand casting molds have low costs but require repeated mold making; the per-unit cost is low for large-volume production. Metal mold casting molds have high costs but are reusable, significantly reducing the per-unit cost for large-volume production.
Materials: Sand casting has a high proportion of sand mold costs, while metal mold casting has a high proportion of molten metal costs, and metal mold casting has a higher material utilization rate.
Production efficiency: Sand casting has a longer single-piece molding time, while metal mold casting has a faster production speed after mold preparation.
Post-processing: Sand casting results in a rough surface and high post-processing costs; metal mold casting results in a smooth surface and low post-processing costs.
The above are the differences in gating systems between sand casting and gravity casting. Of course, if you need to customize large quantities of castings, whether sand casting or gravity casting, you can choose to cooperate with Mulan Metal. Mulan Metal has 12 years of experience in casting production and processing and has helped customers in more than 30 countries complete the production of various castings. We look forward to your cooperation inquiry.
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