A method for manufacturing a split nozzle ring

Abstract

The invention discloses a method for manufacturing a split nozzle ring, which has higher manufacturing precision. Including: S1, nozzle ring blank of split casting semi-ring structure; S2, machining, including: scribing; wire cutting center splitting; heat treatment stress relief; surface; scribing; machining the connecting holes on the split surface of the two halves, and connecting the two halves to form a nozzle ring; rough turning each surface of the nozzle ring; splitting the part into two halves, cleaning the burrs; milling the nozzle ring Two gaps at the outer circle on the half-parting surface; butt the two halves of the parts to form a nozzle ring; semi-finishing and finishing turning each surface of the nozzle ring; process the threaded holes on the outer circle of the nozzle ring; grind the two ends of the nozzle ring.

Description

technical field [0001] The invention relates to the technical field of steam turbine manufacturing and processing, in particular to a method for manufacturing a split nozzle ring. Background technique [0002] The split nozzle ring is the core component of this type of steam turbine product, key parts, such as figure 1 As shown in the figure, A-rotor, B-disc a, C-interstage air seal a, D-split nozzle ring a, E-disc b, F-cylinder, G-split nozzle ring b , H- interstage air seal b. [0003] The split nozzle ring is installed on the cylinder block of the steam turbine. The blades of the split nozzle ring control the gas flow of the steam turbine during operation. The split nozzle ring is combined with the interstage air seal to control the gas seal between the cylinder block and the rotor sleeve. This part The structure is that the blade connects the inner and outer rings, and the blade affects its overall strength. Its working environment is high temperature and high pressure...

AI Technical Summary

Problems solved by technology

[0003] The split nozzle ring is installed on the cylinder block of the steam turbine. The blades of the split nozzle ring control the gas flow of the steam turbine during operation. The split nozzle ring is combined with the interstage air seal to control the gas seal between the cylinder block and the rotor sleeve. This part The structure is that the blade connects the inner and outer rings, and the blade affects its overall strength. Its working environment is high temperature and high pressure, which has high requirements for the strength of the parts. At the same time, there are also high requirements for assembly and cooperation between this part and the surrounding parts. Special parts Thickness, diameter, coaxiality, flatness, parallelism and other precision requirements must be guaranteed, otherwise it will cause friction and wear between parts during work, resulting in damage to the split nozzle ring, affecting the air flow of the whole machine, and damaging the cylinder and The airtightness between the rotor sleeves, causing accidents

[0004] The part has the following problems in the existing manufacturing scheme; 1. The part has many shrinkage cavities and crack defects that affect the strength

2. The overall deformation of the parts during the processing causes the size and shape tolerance to be out of tolerance, and even the blades will be processed, resulting in the air flow of the whole machine not meeting the design requirements

3. The blade is bent and deformed during the milling process

4. The facet in the part cannot meet the design requirements

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