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A processing method for the steam seal arc section of a steam turbine in a power station

A processing method and steam turbine technology, applied in mechanical equipment, engine components, machines/engines, etc., can solve the problems affecting the machining accuracy of the steam seal arc section of the steam turbine in the power station, the steam seal teeth are easy to fall, the ring is easily deformed, etc. The effect of installation fixed time, preventing steam seal teeth from lodging, and avoiding stress release

Active Publication Date: 2016-03-23
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 provide a method for processing the arc section of the steam turbine seal of a power station to solve the time-consuming and labor-intensive processing method. During the clamping process, the ring of the arc section of the steam turbine seal of the power station is easily deformed, especially the seal teeth are easy to fall. A problem that seriously affects the machining accuracy of the arc section of the steam turbine seal in the power station

Method used

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  • A processing method for the steam seal arc section of a steam turbine in a power station
  • A processing method for the steam seal arc section of a steam turbine in a power station
  • A processing method for the steam seal arc section of a steam turbine in a power station

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specific Embodiment approach 1

[0016] Specific implementation mode one: combine Figure 1 to Figure 4 Illustrate, the steam turbine steam seal arc section processing method of the power station described in the present embodiment is realized according to the following steps:

[0017] Step 1: Rough machining of the arc-shaped blank of the steam seal, milling the inner arc surface 1, the outer arc surface 2, the upper and lower bottom surfaces and the radiating surfaces at both ends of the arc section of the arc section of the steam seal. The machining allowance of each processing surface is 1.8 mm~2.2mm,

[0018] Step 2: Temper the steam seal arc section after milling, the tempering temperature is 690 ° C ~ 740 ° C, the tempering time is at least 12 hours, air cooling after tempering,

[0019] Step 3: Milling the upper and lower bottom surfaces of the steam seal arc section, the machining allowance of each surface is 0.18mm ~ 0.22mm,

[0020] Step 4: Grinding the upper and lower bottom surfaces of the arc ...

specific Embodiment approach 2

[0025] Specific implementation mode two: combination Figure 1 to Figure 4 Note that the feed fz of the semi-finishing inner arc surface 1, outer arc surface 2 and arc boss 3 in step five of the present embodiment is 0.15mm / tooth. The selected feed rate fz is 0.15mm / tooth, which effectively guarantees the accuracy of the shape and dimension of the arc section of the steam seal of the steam turbine.

[0026] The undisclosed technical features in this embodiment are the same as those in the first embodiment.

specific Embodiment approach 3

[0027] Specific implementation mode three: combination Figure 1 to Figure 4 Note that the feed rate fz for finishing the inner arc surface 1, the outer arc surface 2 and the arc boss 3 to the standard size in step six of this embodiment is 0.10mm / tooth.

[0028] The undisclosed technical features in this embodiment are the same as those in the first or second specific embodiment.

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Abstract

The invention provides a method for processing a steam seal arc segment of a power station steam turbine, and relates to a method for processing the steam seal arc segment of a steam turbine. Through the adoption of the method, the problems that the conventional processing method wastes time and energy, a circular ring of the steam seal arc segment of the whole power station steam turbine is easily deformed in the process of clamping, especially steam seal teeth fall easily, and the processing accuracy of the steam seal arc segment of the power station steam turbine is seriously influenced are solved. A special three-edge slot milling cutter for the U-shaped slot of the steam seal arc segment is used for fine processing the U-shaped slot of the steam seal arc segment, the shapes of the three edges of the special three-edge slot milling cutter for the U-shaped slot of the steam seal arc segment are consistent with that of the cross section of the U-shaped slot of the steam seal arc segment, the feed per tooth fz is 0.08 mm / tooth to 0.12 mm / tooth, and the cutting velocity vc is 40 m / min to 50 m / min. The method provided by the invention is used for processing the steam seal arc segment of the power station steam turbine.

Description

technical field [0001] The invention relates to a method for processing the steam seal arc section of a steam turbine. Background technique [0002] The steam seal arc section of the power station steam turbine has a relatively large diameter, generally 2 to 3 meters in diameter. The existing processing method for the steam turbine seal arc section of the power station is to install the ring of the steam turbine arc section of the power station on a large lathe for processing , and then cut the circular ring of the steam turbine seal arc of the entire power station into several arc segments. The ring is very large, so the secondary clamping of the arc section of the steam turbine seal of the power station is difficult, time-consuming and labor-intensive. During the clamping process, the ring of the arc section of the steam turbine seal of the power station is easily deformed, especially the seal teeth are prone to lodging , which seriously affects the machining accuracy of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
CPCB23P15/00F01D11/00
Inventor 陈永亮张彦成国富王淑琴高思明周全
Owner HARBIN TURBINE
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