Method for casting isometric crystal turbine work blade blanks

Abstract

The invention discloses a method for casting isometric crystal turbine work blade blanks. The method is characterized by firstly adopting a bottom pouring system and a top pouring system and comprising the following steps of: casting isometric crystal turbine work blades in groups, wherein each group comprises four to twenty work blades which are distributed along the blade circumference; then under the conditions of uniform and identical temperature and uniformly-distributed temperature, adhering an attachment structure to the middle of the back of each blade to be poured and connecting the attachment structure to a straight sprue to form a feeding head and eventually form a mixed pouring system of top pouring, bottom pouring and side pouring; and finally casting by using the mixed pouring system of top pouring, bottom pouring and side pouring so as to obtain the isometric crystal turbine work blade blanks. Through X-ray detection on blade cast produced by the method, the loose defect in the blades is eliminated completely and the requirements of a technical standard are met. The loose defect in the blades is eliminated and the metallurgical quality and the mechanical property of turbine blades are enhanced greatly.

Description

technical field [0001] The invention relates to the technical field of equiaxed crystal turbine working blade casting, and in particular provides a blank casting method of equiaxed crystal turbine working blade. Background technique [0002] In the past, the metallurgical standards of equiaxed turbine blades used in aviation allowed a certain degree of metallurgical defects inside the blade. However, with the increasing number of research and development projects of new types of aero-engines, the new-generation aero-engines urgently need to improve the working performance of gas turbine engines, and higher requirements are put forward for the performance and metallurgical quality of turbine blades. [0003] The mechanism of blade looseness: when the liquid metal fills the mold cavity, the liquid metal dissipates heat outward through the mold, and as the heat spreads out, the metal shrinks in liquid form, which may cause shrinkage cavities or cavities in the final solidified ...

AI Technical Summary

Problems solved by technology

And because the blade body is a cast blade without margin, if there are loose defects inside, it cannot be removed by grinding and other methods, and the standard requires that repair welding is not allowed

Therefore, once loose defects occur inside the leaf body, the blade can only be scrapped and cannot be saved

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