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For example, when pouring and hoisting the fired products(white fused alumina), the bell mouth for hoisting shall be reserved when making the stone sound mold, and the center angle of the bell mouth shall be 60 °. The third kind of pressure grouting: pressure grouting generally adopts the method of injection(steel grid). This pouring method can shorten the time of grouting and increase the density of grouting failure, so it must be increased when making gypsum mold.

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When pouring large-scale products(white aluminum oxide), the grouting pipe should be extended to the bottom of the gypsum mold to prevent the slurry from impacting the gypsum mold to reduce the uneven wall thickness of the products caused by the influence of the suction speed(garnet suppliers). Control the grouting speed according to the size of the product to prevent the uneven phenomenon of the upper wall and the lower carbon screen caused by the slow grouting speed.

(bulk buy high quality white corundum powder uk)In the process of slurry suction, make up slurry continuously, and keep the slurry level not lower than the upper opening of gypsum mold. According to experience and observation, after the slurry suction reaches the required thickness, the residual slurry shall be immediately poured back to the slurry bucket(garnet abrasive). When the vacuum degree reaches 3.999-6.665kpa (30-50mmhg), open the valve to inject mud, fill the mud and then close the valve.

The fourth is vacuum casting(brown fused alumina price). After slurry control, the gypsum mold shall be placed vertically and obliquely, which is conducive to the separation of the body from the gypsum mold. The green body can be demoulded when it is free from the mold and has a certain strength(aluminum oxide abrasive). The combined gypsum mold should take off part of the gypsum mold or the part of the gypsum mold without stress, and finally take off all the stone sound mold.

The pressurization method is to put the mud into the high-level mud bucket which can move up and down(silicon carbide abrasive), improve the level difference between the mud bucket and the gypsum mold, make the mud form a natural pressure, and connect with the gypsum mold through the mud discharge pipe and valve(aluminum oxide grit). When the valve is opened to inject mud, the height of the mud bucket is adjusted to adjust the grouting speed.(bulk buy high quality white corundum powder uk)

After the gypsum mold is filled with mud, keep the upper plane of the mud in the mud bucket consistent with the liquid level of the gypsum mold(green silicon carbide), and adjust the height of the mud bucket at any time. First put the gypsum mold into the vacuum chamber and connect it with the pouring mud pipe, then close the sealing door and start the vacuum pump to pump air(synthetic corundum). After grouting (to the required thickness), demould in the vacuum outdoor.

(bulk buy high quality white corundum powder uk)Because of its simple equipment and easy operation technology, it is widely used in small products with complex shape and thin wall(black silicon carbide). Although the vacuum casting process is relatively complex, the quality of casting billet has been significantly improved, the porosity of the injection parts is low, and the density is improved. True fifth centrifugal casting: this method is suitable for manufacturing large annular products and tubular products.

The slurry forms a compact dry turnover layer on the gypsum mold wall under the centrifugal force in the gypsum(emery abrasive), and the pouring time is determined according to the wall thickness requirements of the products. In order to prevent mud overflow during grouting, only two thirds of the mold height can be added(glass bead blasting media suppliers). The ordinary mud casting process can also improve the quality of injection failure and the production efficiency.