Lost foam casting method

Abstract

The invention discloses a lost foam casting method comprising the steps of 1. taking foam as a material, molding a foam die which is the same as a cast in shape, preserving a sprue gate on the foam die; 2. coating a high-temperature-resistant poromeric material on the foam die, and baking for 4-7 hours in the environment below 45 DEG C; 3. paving roughing sand on the foam die, carrying out three-dimensional ramming filling from the periphery to the middle so as to discharge gas in the sand; 4. casting inwards from the sprue gate under the effect of negative pressure; and 5. cleaning shakeout to obtain the cast. The foam die is taken as a casting mold, so that on one hand, the problem that the metal die casting mold is difficult to process is solved; and on the other hand, the problem that the sand die casting mold is not easy to mold is solved. The foam die can be produced by batch due to the plasticity that the foam die is easy to process. Therefore, the casting mold is high in processing efficiency, and the material and device costs in the molding process of the foam die are low. Thus, the production cost also can be effectively reduced in comparison with the entire casting process.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a lost foam casting method. Background technique [0002] The existing commonly used casting methods include metal mold casting and sand casting. Among them, metal mold casting is a casting process in which heat-resistant alloy steel is used to make hollow molds for casting. Although the casting mold of the metal mold can be used repeatedly, the production efficiency of the metal mold casting process is very high. However, since the mold material used in metal mold casting is heat-resistant alloy steel, the price is expensive. However, the processing process of the hollow cavity for this material is complicated, and the design cost invested is more, so the production cost of metal mold casting is relatively high. And because the mold of metal mold casting is limited by the size of mold material and the capacity of cavity processing equipment and casting equipment, it is not su...

AI Technical Summary

Problems solved by technology

However, the disadvantage of sand casting is that since each sand mold can only be poured once, the mold is damaged after the casting is obtained and must be reshaped, so the production efficiency of sand casting is low

[0004] It can be seen from the above that the mold material of metal mold casting is alloy steel, so matching cavity processing equipment is required, and the corresponding mold process is relatively complicated and the cost is high; while sand mold casting is low in cost, due to the use of loose sand particles that are not easy to shape type material, so the molding efficiency of the mold is low

Therefore, the existing casting methods cannot simultaneously have the effects of high-efficiency casting and low cost.

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