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Processing method of sub-last stage blade with good blade profile stability of large turbine

A processing method and a stable technology, which is applied in the field of large steam turbine blade processing, can solve the problems of easy deformation of the secondary and final stage blades of large steam turbines, and achieve the effect of ensuring overall consistency, uniform clearance, uniform deformation and uniformity.

Inactive Publication Date: 2013-03-06
HARBIN TURBINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the defect of easy deformation of the large steam turbine second-end stage blade prepared by the existing invention, and provide a method for processing the large-scale steam turbine second-end stage blade with good blade shape stability

Method used

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  • Processing method of sub-last stage blade with good blade profile stability of large turbine

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specific Embodiment approach 1

[0007] Embodiment 1: The processing method for the secondary and final stage blades of a large steam turbine with good blade profile stability described in this embodiment is specifically completed according to the following steps: firstly, the to-be-milled casting is clamped on a Ferrari machine tool at one time, and then The three-cut milling method is used for processing, that is, the processing of the secondary and final stage blades of large-scale steam turbines with good blade profile stability is completed.

[0008] In this embodiment, the shape line of the secondary and final stage blades of the large-scale steam turbine is kept well during the machining process, and after the machining is completed, the blades are not easily deformed after being removed from the machine tool.

[0009] This embodiment adopts one-time clamping, that is, when the steam channel profile is processed, the ultra-thin shroud profile of the blade crown bone type is also processed; the Ferrari m...

specific Embodiment approach 2

[0011] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the specific operations of the three-knife milling method are as follows: the first knife roughing removes the hardened layer on the surface of the casting to be milled, and the second knife adopts a margin of 0.5mm is used for fine milling, and the third knife is polished with an allowance of 0.1mm. Others are the same as the first embodiment.

[0012] This embodiment adopts the three-knife milling method for processing. The first knife removes the hardened layer of the blank, which can provide conditions for the use of the next tool, and can release the blank forging stress for the first time; the second knife is for fine milling to remove the allowance, and The machining stress can be removed for the second time; the third cutter is fine milling to ensure the polishing amount of the vane air passage.

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Abstract

The invention relates to a processing method of a large blade of a turbine, in particular to a processing method of a sub-last stage blade with good blade profile stability of a large turbine, which aims to solve the defect that in the prior art, the manufactured sub-last stage blade of the large turbine is easy to deform. The method comprises the following steps of: firstly clamping a casting to be milled on a Ferrari machine tool at one step, then adopting a three-cutter milling method for processing, so as to complete the processing on the sub-last stage blade with the good blade profile stability of the large turbine. The processing method disclosed by the invention has the advantages that 1, the profile is kept good, and the blade is not easily deformed; 2, the errors can be eliminated, so that the whole consistency of an assembling part of the blade can be ensured, and further, the ultrothin shroud molded lines of a blade shroud skeleton pattern is uniform and consistent in deformation; 3, the three-cutter milling method is adopted for processing, so that forging stress of a blank can be released, the mechanical processing stress can be eliminated, and the polishing amount of a blade steam passage can be ensured; and 4, the gap uniformity and linearity in the whole circle of assembling of the blade can be ensured. The processing method is mainly used for processing the sub-last stage blade of the large turbine.

Description

technical field [0001] The invention relates to a method for machining large blades of a steam turbine. Background technique [0002] At present, the second and final stage blades on steam turbines have large blades with a size of more than 1000mm. The shape of the second and last stage blades of such large steam turbines maintains a good shape during the machining process, but after the machining is completed, the blades will be deformed soon after they are removed from the machine tool. , At this time, the blade steam channel profile and the shroud do not meet the product requirements, and need to be processed by the calibration process. The calibration process only passes the approximate pressing of the blade profile at the gear position, and the blade does not fully meet the technical requirements of the product as a whole. Therefore, the secondary and final stage blades of the large-scale steam turbine prepared by the existing invention have the defect of being easily ...

Claims

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Application Information

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IPC IPC(8): B23C3/00
Inventor 付贵言黎胜春姜国栋王玉君王玉敏邵苓郎慧亭王海东隋朝龙范立刚
Owner HARBIN TURBINE