One-time molding method for aero-engine porous laminate cooling turbine blade ceramic core

Abstract

The invention discloses a method for one-time molding of a ceramic core of a turbine blade with divergent cooling of porous laminates of an aero-engine, and provides a method for one-time molding of a ceramic core of a turbine blade by using the principle of soluble materials, which greatly improves the qualified rate of the product .

Description

technical field [0001] The invention relates to a manufacturing process of an aero-engine turbine blade, in particular to a one-time forming method of a ceramic core in the manufacturing process. Background technique [0002] Compared with the aero-engine turbine blades that adopt the general cooling method, the blade basin and the blade back each have an additional layer of cooling chambers. The turbine blades of aeroengines with general cooling methods generally have only one cavity. In addition to the internal cavity of the divergent cooling turbine blade of the porous laminate of the aeroengine, there are one or more layers of cavities on the blade basin and the back of the blade, and the internal cavity and the outer cavity are communicated by impact air holes. [0003] The inner cavity of the aeroengine blade is very complex and cannot be obtained by machining. At present, aeroengine blades are obtained by precision casting. Then by machining the castings, the parts...

AI Technical Summary

Problems solved by technology

[0008] a. Dividing the ceramic core into several parts and manufacturing them separately will cause difficulty in forming the parts

Generally speaking, the thickness of the outer cavity of the porous laminate of the aero-engine cooling turbine blade ceramic core is only about 0.7mm, and the length will be 50-120mm long. After the separation, when pressing the wet outer cavity parts, the mold The deformation caused by the process cannot be solved, and the deformation of the ceramic core during the firing and strengthening process will be very large

Once there is a large amount of deformation, the size of the ceramic core cannot be guaranteed. The thickness of the outer wall of the porous laminate plate of the aero-engine cooling turbine blade is only about 0.7mm. Once the deformation of the ceramic core exceeds a certain value, there will be After pouring, the casting has core leakage and the casting is scrapped;

[0009] b. Manual bonding of ceramic core components will further intensify the loss of ceramic core accuracy. First, manual bonding cannot guarantee the relative positional relationship of each component. Second, manual bonding is not consistent, which will affect the later data. The analysis brings problems. The ceramic core is divided into several parts and manufactured separately, and then the whole ceramic core is obtained by manual bonding to manufacture the ceramic core of the aero-engine porous laminate divergent cooling turbine blade, which will cause the ceramic core The structure and size of the castings are quite different from the theoretical values, and there are no rules to follow, which will seriously affect the quality of castings, resulting in low pass rate and low efficiency of castings, a large amount of production capacity will be occupied, and the manufacturing cost of castings will be increased.

[0010] The method of manufacturing the casting by dividing it into several parts, and then welding to obtain the whole casting has such disadvantages: if the porous laminate divergent cooling turbine blade is cast by welding, it will seriously affect the life of the porous laminate divergent cooling turbine blade. When the aero-engine adopts the divergent cooling technology of porous laminates, the blades of the turbine part need to withstand the temperature of 1900°C-2150°C, and the engine needs to rotate at a high speed when it is working, which will generate huge centrifugal force, and the weld cannot withstand such a high temperature. , and the huge centrifugal force is likely to cause the fatigue fracture of the porous laminate cooling turbine blade from the welding seam, these are huge hidden dangers