A Calculation Method of Correction of Center of Integral Impeller

Abstract

Disclosed is a method for calculating deviation rectification of the center of an integral impeller. A determination and application process of the method comprises the following steps of determining and calculating the center line of a disc body portion; determining and calculating the center lines of blade portions by using UG (Unigraphics NX) modeling software; determining the center line of the integral impeller; guaranteeing that the allowance of a wheel disc portion and the allowance of the blade portions are uniform; calculating and determining the theoretical size of a portion to be machined; writing the theoretical size of the portion to be machined in a process file; establishing parts and workblank models; determining the smallest theoretical width of blades of workblanks and the distance between an air feeding and discharging edge and a leaf type stacking line; analyzing an allowance distribution condition and drawing a machining allowance graph; determining and calculating the center line of the disc body portion; determining and calculating the center lines of the blade portions; and determining the center line of the integral impeller. The method for calculating the deviation rectification of the center of the integral impeller has the advantages that because the blade portions are W-shaped integral impeller workblanks, qualified parts of the integral impeller can be machined sequentially under the condition that the allowance of the workblanks is met, and insufficient local allowance caused by over high wrong modulus of the wheel disc portion and the blade portions in a rough machining stage is avoided.

Description

technical field [0001] The invention relates to the field of mechanical manufacturing, in particular to a calculation method for center deviation correction of an integral impeller. Background technique [0002] The integral impeller is a new structural part of the aero-engine. It integrates the blades and discs of the engine rotor through advanced technology. The loss caused by the flow reduces the weight of the engine, reduces the number of parts, and greatly simplifies the structure of the engine. It is an important way to improve engine reliability and thrust-to-weight ratio. Due to the complexity and particularity of the leaf shape of the overall blisk, the blank shape of the blade part usually has two structures: round cake shape and W shape. The design, manufacture and forging process of the round cake shape blank mold are simple, but the consumption of raw materials is large. , The follow-up machining allowance is large, the design and manufacture of the W-shaped s...

AI Technical Summary

Problems solved by technology

Due to the complexity and particularity of the leaf shape of the overall blisk, the blank shape of the blade part usually has two structures: round cake shape and W shape. The design, manufacture and forging process of the round cake shape blank mold are simple, but the consumption of raw materials is large. , the follow-up machining allowance is large, the design and manufacture of the W-shaped structure rough mold is difficult, the forging process is complicated, but the consumption of raw materials is small, and the allowance of the blade part is uniform, which is the development direction of efficient and lean manufacturing of parts

[0003] The overall impeller blank is an isothermal die forging. For the W-shaped blank of the blade, the disc and the blade are forged with two different dies, which will cause the centerline of the disc and the blade to appear easily during the forging process of the blank. Inconsistencies with the theoretical centerline, resulting in wrong modulus

At the same time, since the forging process of the overall impeller blank is a new process, in the initial forging stage, it is also very easy to have the situation that the actual margin of the blank is far greater than the theoretical margin, that is, the underpressure of the blank (the difference between the actual margin and the theoretical margin) poor) too large

[0004] Based on the above two situations, in the subsequent machining, if the underpressure and wrong modulus are not considered, but only the theoretical value is used as a reference, it will lead to insufficient local allowance of the W-shaped integral impeller blank, which will cause the blank to be scrapped

Images