Hollow casting investment casting process

Abstract

The invention provides a hollow casting investment casting process. The process comprises the following steps that a wax pattern is prepared according to the appearance shape of the pattern in a design drawing provided by a user, a core rod is prepared according to the shape of an inner cavity of the pattern in the design drawing provided by the user, the surface of the core rod is sequentially coated with a reinforcing material, a transition material and a protective material from inside to outside, then the core rod is inserted into the wax pattern to form a mold set, after fire-resistant sand is sprayed to the surface of the mold set, the mold set is subjected to roasting to obtain a die shell, an alloy material which is smelted into the liquid state is poured into the die shell, a hollow casting is obtained after the alloy material is solidified, and a reinforcing material is corundum sand. By adopting the technical scheme, the surface of the core rod is completely wrapped by adopting the fine particle size sand, so that the core rod is free of too large local area temperature difference in all working procedures of the investment casting process, the core rod can be effectively prevented from breaking, and a foundation is laid for improving the molding quality of the finished product casting.

Description

technical field [0001] The invention relates to the technical field of casting technology, in particular to a hollow casting investment casting technology. Background technique [0002] Investment precision castings are widely used in the field of aerospace. In the investment casting process, it is first necessary to prepare corresponding wax patterns according to the shape characteristics of the castings to be cast. Bond several sprues, and then bond all the sprues together through risers to form a module, then spray refractory sand on the surface of the module, and bake the module at high temperature to melt all the wax contained in the module At this time, the mold shell is made, and finally the molten alloy material is poured into the mold shell to make a casting. With the development of technology, people have more and more requirements for the function of casting products, and correspondingly put forward higher requirements for the shape and structure of casting produ...

AI Technical Summary

Problems solved by technology

With the development of technology, people have more and more requirements for the function of casting products, and correspondingly put forward higher requirements for the shape and structure of casting products. Hollow casting products are an extremely important casting product. The existing In the technology, in order to cast hollow castings, it is usually necessary to insert a corresponding mandrel made of high temperature resistant material inside the solid wax mold, and then cast it according to the conventional investment casting process, so that the mandrel is installed at the position of The corresponding cavity structure is formed inside the corresponding casting. However, although the mandrel is made of high-temperature-resistant materials, it is relatively brittle, and it is very easy to break the mandrel when it goes through processes such as dewaxing, high-temperature roasting and pouring alloy liquid. The problem is that the size of the cavity structure inside the finished casting deviates, which affects the molding quality of the finished casting

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