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Sealing pad machining method

A processing method and sealing tile technology, which are applied in the processing field of sealing tiles, can solve the problems of low processing precision of sealing tiles, and achieve the effects of reducing deformation, ensuring processing precision and optimizing process plan.

Inactive Publication Date: 2012-10-24
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 problem of low processing precision of the sealing tile in the existing processing method of the sealing tile for the steam turbine rotor, and to provide a processing method of the sealing tile

Method used

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  • Sealing pad machining method
  • Sealing pad machining method

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specific Embodiment approach 1

[0018] Specific implementation mode one: combine Figure 1-Figure 3 Describe this embodiment, the concrete steps of a kind of sealing tile processing method of this embodiment are:

[0019] Step 1. Mill the mid-section surface of the upper half-seal tile 1-1 and the mid-section surface of the lower half-seal tile 1-2 to be flat, and the processing amount is ≤1.5mm;

[0020] Step 2. Roughly turn the inner arc, outer arc and two planes of the upper half sealing tile 1-1 and the lower half sealing tile 1-2. 1mm, the cutting parameters are: the speed is 58-62r / min, the feed rate is 0.2-0.4mm / r, and the cutting depth is 1.5mm;

[0021] Step 3: Perform stress-relief treatment on the upper half-sealed tile 1-1 and the lower half-sealed tile 1-2 respectively. The specific process of stress-relief treatment is as follows: first heat to 500°C-650°C for 2-3 hours, then Keep warm for 2 hours, and finally cool slowly with the furnace to 200°C-300°C, and the cooling time is 10-12 hours; ...

specific Embodiment approach 2

[0030] Embodiment 2: The cutting parameters in step 2 of this embodiment are: the rotational speed is 60 r / min, and the feed rate is 0.3 mm / r. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0031] Specific embodiment three: the specific process of stress relief treatment in step three of this embodiment is: firstly heat to 550°C, heating time is 2.5 hours, then keep warm for 2 hours, and finally cool slowly to 280°C with the furnace, cooling time is 11 hours . Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a sealing pad machining method, relating to a machining method of a sealing piece, particularly relating to a machining method of a sealing pad for a steam turbine rotor, and aiming at solving the problem that the sealing pad is lower in machining precision in the conventional machining method of a sealing pad of a steam turbine rotor; the machining method comprises the following main steps of: step 1, milling a split plane of an upper half sealing pad and a split plane of a lower half sealing pad; step 2, roughly milling inner arcs, outer arcs and two planes of the upper half sealing pad and the lower sealing pad; steps 3, carrying out a distressing process on the upper half sealing pad and the lower sealing pad respectively; step 4, semi-finely milling the inner arcs, the outer arcs and the two planes of the upper half sealing pad and the lower sealing pad; steps 5, boring each stair of the upper half sealing pad and each stair of the lower half sealing pad; step 6, connecting the upper half sealing pad and the lower sealing pad integrally; and step 7, finely milling inner holes, outer circles and concave stair standards of the sealing pads. The method is used for machining the sealing pads for the steam turbine rotor.

Description

technical field [0001] The invention relates to a processing method of a sealing member, in particular to a processing method of a sealing shoe used for a steam turbine rotor. Background technique [0002] The sealing shoe is the seal of the shaft end of the steam turbine rotor. The sealing shoe is composed of the upper half and the lower half. The base is made of 25 steel. The inner hole has a 3mm thick bearing alloy cast in one piece. play a protective role. The upper and lower half of the sealing tile requires a 0.05mm feeler gauge not to enter, and the inner hole requires Φ419 (+0.025 / 0)mm. The processing precision of the sealing tile in the existing processing method of the sealing tile for the steam turbine rotor is relatively low. Contents of the invention [0003] The object of the present invention is to solve the problem of low processing precision of the sealing tile in the existing processing method of the sealing tile for the rotor of a steam turbine, and fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
Inventor 魏成双徐鹏树魏崇巍孙盛丽
Owner HARBIN TURBINE
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