An Investment Casting Process to Accelerate the Solidification and Cooling of Castings

Abstract

The invention discloses an investment casting process accelerating solidification and cooling of a casting. The process includes the steps that wax molds are manufactured according to a normal process, and the wax molds are combined into a mold set; the wax molds are painted according to the normal process for shell manufacturing, when shell manufacturing is finished by 60%, battens are inserted into inner cavities of mold shells, cold iron bars with the number equal to that of the battens are prepared for shell manufacturing, wax removal and calcination according to the normal process, and complete mold shells are formed; a hammer is used for knocking off the portions, at the exposed positions of the battens, of the mold shells; the prepared cold iron bars are inserted into the cavities, formed after the battens are burnt out, of the mold shells; and casting and following treatment operation are completed according to the normal process. The battens are inserted into the inner cavities of the mold shells in the manufacturing process of the mold shells, after calcination of the mold shells, the iron bars are used for replacing the burnt-out battens to be inserted into the cavities of the mold shells, heat in pipelines or the inner cavities can be rapidly exhausted through good heat conductivity of the iron bars after casting, the solidification and cooling speed of the casting is increased, and the defects of shrinkage and looseness of the casting are avoided.

Description

technical field [0001] The invention relates to the field of investment casting, in particular to an investment casting process for accelerating the solidification and cooling of castings. Background technique [0002] There are many investment castings with pipes or inner cavities. For the production of pipes and inner cavities, when the size and space of the pipes and inner cavities are small or the structure is more complicated, ceramic cores, glass cores, metal cores and other methods are used to place them in advance. Put it into the inner cavity of the casting wax mold, and then make the shell with normal paint, dewax, roast, and pour; form. However, for the method of directly making shells with normal paint, when the paint shells reach a certain level, the pipes and inner cavities are completely blocked by refractory powder and sand for shell making, and they are in a closed state; The cavity is completely isolated from the outside world. When pouring castings, duri...

AI Technical Summary

Problems solved by technology

However, for the method of directly making shells with normal paint, when the paint shells reach a certain level, the pipes and inner cavities are completely blocked by refractory powder and sand for shell making, and they are in a closed state; The cavity is completely isolated from the outside world. When pouring castings, during the cooling and solidification process of the alloy liquid, the heat dissipation of the pipe or inner cavity is slow, the solidification time is long, and defects such as shrinkage cavities and looseness are prone to occur.

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