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It has good corrosion resistance to water vapor and water medium(aluminum oxide abrasive), and has enough strength to bear the pressure and heating steam pressure produced by bead foaming in mold cavity. In the process of pattern production, the foam mold should be subjected to periodic heating and cooling, and work under the conditions of water and steam(artificial corundum), so its material properties should meet the following requirements.

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Due to the poor thermal conductivity of the foam pattern(black silicon carbide), it is only the cooling of the mold surface is hard, and the pressure of the internal expansion of the sample is still in the hot state. The pressure of the internal expansion is borne by a hard shell on the surface. With the decrease of the surface temperature of the sample(chrome corundum), the expansion pressure decreases rapidly until the sample reaches enough stability before it can be released.(cheap abrasive garnet sand suppliers uae)

The lost foam mold must obtain a foam pattern that is close to the true shape of the casting, so mold design is subject to many constraints(green silicon carbide). It is only suitable for small batch production of foam plastic pattern. If the temperature inside the pattern is not lowered enough to demould, the expansion force in the pattern will lead to the expansion and deformation of the pattern(silicon carbide 180 grit). The upper and lower air chambers are provided with inlet and outlet.

(cheap abrasive garnet sand suppliers uae)Because of the manual operation of the cylinder, the production cycle is long, the efficiency is low, and the labor intensity is large(pink aluminum oxide). Due to the light weight and good thermal conductivity of aluminum alloy, aluminum alloy is generally used to make foam mold(white aluminum oxide powder). For castings with complex shape (such as cylinder block and valve), the mold can be divided into several parts or the structure of core pulling combined mold can be used.

The foam mould for the air chamber of the press(white fused alumina), referred to as the mould for the air chamber of the press, is usually open up and down or left and right. The results show that the heating and cooling of the aluminum alloy mold are uniform during the foaming process, and the processing performance of the aluminum alloy is good(aluminium oxide polishing powder), which can meet the requirements of the shape and size accuracy of the pattern.(cheap abrasive garnet sand suppliers uae)

The mold core and die frame are respectively fixed on the upper and lower air chambers(brown fused aluminum oxide), and a feeding port is set at the appropriate position of the mold frame, so that the preformed foam beads can fill the mold cavity smoothly. Choosing the right die material and designing the best die structure can not only improve the quality of the pattern(white aluminum oxide 80 grit), but also reduce the cost of mold making, and maintain the stability of mold shape and size.

(cheap abrasive garnet sand suppliers uae)The selection of parting surface should not only ensure the quality and strength, but also make the installation and disassembly of the mold easy(white aluminium oxide), and the operation is convenient; it is conducive to opening the feeding port, so that the beads can fill the cavity and the pattern can be taken out from the mold(garnet abrasive). Good thermal conductivity, conducive to rapid heating and cooling. Position of parting surface and feeding port.

In general, the whole mold should be used as far as possible(black aluminum oxide). When the superheated steam is used for bead foaming, the steam enters into the mold cavity through the air hole in the air chamber, so that the beads in the vent plug area expand rapidly, overheat and bond together, which hinders the steam to continue to spread inward, and leads to poor bead fusion in the cavity(aluminum oxide grit). EPC mold is different from other casting mold.