Nuclear power generator sealing pad machining method

Abstract

The invention discloses a nuclear power generator sealing pad machining method. The nuclear power generator sealing pad machining method comprises the following steps: S1, preparing an arc-shaped piece according to the radian of a sealing pad to serve as a datum reference tool; S2, the datum reference tool is horizontally placed and fixed to a lathe and aligned, and one plane of the datum reference tool faces upwards to serve as a fixed surface; and S3, four pad blocks of the sealing pad are sequentially fixed to the datum reference tool, the end surface of the datum reference tool serves as a datum reference surface, the end surfaces of the pad blocks are milled, and the pad blocks with the preset arc length are obtained. According to the nuclear power generator sealing pad machining method, the datum reference tool is arranged as the machining datum of the pad, the machining accuracy of the end surfaces of the pad is improved, and the problems of incomplete contact and opening of the butt joint of the end surfaces of the pad are solved; and the deviation of the inner diameter of the circumference of the whole ring of the machined sealing pad is minimum, repeated machining is avoided, and manpower and lathe resource consumption are greatly reduced; and the machining period of the sealing pad is shortened.

Description

technical field [0001] The invention relates to the technical field of nuclear power equipment processing, in particular to a processing method for sealing tiles of nuclear power generators. Background technique [0002] ALSTOM half-speed model single-flow ring generator sealing tile ring is fixed by a spring, and a certain pre-tightening force is applied to match the circumference of the generator journal. During operation, a certain pressure of sealing oil is supplied from the outside, and the rotating journal and A pressure oil film is formed between the sealing tiles to prevent hydrogen leakage from the generator. For the sealing tile to play its normal function, the mating surface must ensure a certain degree of smoothness and circumferential clearance. [0003] Wearing and scratching will inevitably occur on the mating end faces of the seal shoe, the journal and the seal shoe chamber during a period of operation, and the roughness exceeds the standard due to scratches...

AI Technical Summary

Problems solved by technology

However, in the first process of sealing tile processing, milling the end face of the tile to reduce the inner diameter, there has been a long-term problem that when 4 sealing tiles are assembled together after processing, there is a gap between the end faces of the tile, and the gap value varies from 0.02 to 0.12mm. like figure 1 shown

The above problems exist in the sealing tile processing process for a long time, resulting in repeated sealing tile processing, and affecting the precision after processing, resulting in a very large waste of construction period, manpower, and lathe resources

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