Straight -hole honeycomb ceramic filter has the characteristics of larger, high strength, and heat -resistant shocks than the surface area. The following effects can be achieved through internal filtration: purify metal solution unless metal impurities and gases; make metal liquid charging stable, reduce the vortex; simplify the simplification of the vortex; simplify Pouring the system to improve the production rate of craftsmanship; reduce casting air holes, and optimize and refine metal tissue;