Application of inner chill in investment casting process

Abstract

The invention discloses an application of an inner chill in an investment casting process, and relates to the technical field of the casting processing application. The application comprises the stepsof hot spot holing, inner chill preparing, inner chill surface oil stain treatment, inner chill surface rust removal treatment, inner chill mounting, and mold shell roasting and steel casting. The application has the beneficial effects that small holes are machined in an independent hot spot of a product, a mode of prefabricating the chill is adopted, the purpose of sequential solidification of acasting is achieved so that the problems of shrinkage cavity, shrinkage porosity, depression and the like of the hot spot of the casting can be effectively solved, the number and the volume of riserscan be reduced, and the yield of the process product can be improved; water glass is adopted for carrying out the rust removal treatment on the inner chill, so that the problems of high difficulty and high cost of tinning and bluing processes of the inner chill are solved; and in addition, the problem that the inner chill cannot be immediately cast after taken out from a drying chamber due to theinfluence of objective conditions so that the inner chill is prone to rust when the inner chill stays in the air for a long time can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of application of casting technicians, in particular to the application of inner cooling iron in the investment casting process. Background technique [0002] Chilling iron refers to the chilling material placed inside the cavity, on the surface of the cavity and inside the mold in order to speed up the local cooling speed of the casting. The chilling iron is used in conjunction with the pouring system and the riser system to control the solidification sequence of the casting to obtain qualified For castings, the chilled iron is divided into inner chilled iron and outer chilled iron, which is placed in the cavity and can be fused with the casting as a chilling metal object called inner chilled iron. The inner cooling iron is usually used when the cooling effect of the outer cooling iron is not enough, and it is mostly used for thick castings that do not have high quality requirements and do not withstand hig...

AI Technical Summary

Problems solved by technology

[0003] However, in the existing investment casting process, the surface of the internal cooling iron is generally put into a drying room after being cleaned or tinned and blued and stored for later use. Single tinned and blued requires certain equipment and process conditions, and the cost is very high , and after the inner cooling iron is taken out of the drying room, the inner cooling iron will rust due to weather or other reasons, which affects the application effect of the inner cooling iron in the investment casting process

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