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A quenching method for a rotating ring used in a steam turbine
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A technology of rotating ring and steam turbine, applied in the field of quenching, can solve the problems of large energy demand, long cycle, unfavorable environmental protection and other problems
Active Publication Date: 2021-05-04
HARBIN TURBINE +1
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[0004] The purpose of the present invention is to solve the existing rotating ring quenching technology, which causes processing difficulties after overall treatment, large energy demand, high cost, long cycle, and is not conducive to environmental protection.
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specific Embodiment approach 1
[0030] Specific implementation mode one: combine Figure 1 to Figure 3 Describe this embodiment, the quenching method of a kind of steam turbine rotating ring in this embodiment comprises the following steps:
[0031] Step 1: The raw material of the rotating ring is plate or forging, and the rotating ring is blanked, leaving a machining allowance when blanking, and the shape is corrected after the blanking is completed;
[0032] Step 2: Use a milling machine to process the square window on the rotating ring, use a lathe to process the inner and outer circles and thickness, leave a finishing allowance of 5-10mm in the thickness direction, and process the size of the square window according to the drawing;
[0033] Step 3: After rough machining, perform stress relief heat treatment to remove machine stress. During heat treatment, put the rotating ring on the flat plate. The flatness of the flat plate is not greater than 0.5mm, and the heat treatment temperature is lower than the...
specific Embodiment approach 2
[0040] Specific implementation mode two: combination Figure 1 to Figure 3 To describe this embodiment, the plates and forgings with good hardenability in Step 1 of this embodiment are 2Cr13 or 1Cr13. With such setting, the hardenability is good, so that there is a large hardness difference between the rotating ring and the self-lubricating alloy, which is convenient for lubrication. Other compositions and connections are the same as in the first embodiment.
specific Embodiment approach 3
[0041] Specific implementation mode three: combination Figure 1 to Figure 3 To illustrate this embodiment, in Step 1 of this embodiment, plasma cutting or water cutting is used for blanking of the rotating ring. With this arrangement, compared with the machining blanking method, the cost is saved. Other compositions and connections are the same as those in Embodiment 1 or Embodiment 2.
[0042] Specific implementation mode four: combination Figure 1 to Figure 3 To illustrate this embodiment, in the second step of this embodiment, a milling machine is used to process the square window for the rough machining of the rotating ring, and a lathe is used to process the inner and outer circles and thickness, leaving a 5-10mm finishing allowance in the thickness direction. Such setting facilitates matching with the actual size of the rotating ring. Other compositions and connections are the same as those in Embodiment 1, 2 or 3.
[0043] Specific implementation mode five: combin...
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Abstract
A quenching method for a rotating ring used in a steam turbine relates to a quenching method. The present invention aims to solve the problems of difficult processing caused by overall treatment, large energy demand, high cost, long cycle and unfavorable environmental protection in the existing rotating ring quenching technology. The present invention performs quenching according to the following steps: blanking; rough machining of the rotating ring to remove machine stress; anti-deformation treatment of the laser quenching position of the rotating ring; laser quenching of the locally hardened position of the rotating ring; the quenching sequence is alternate quenching of inner and outer circles, The temperature between the quenching layers is not higher than 40°C; conduct heat treatment to stabilize the structure of the rotating ring, the heat treatment temperature is 350‑450°C, and keep warm for 4 to 6 hours; the rotating ring is subjected to vibration aging treatment; the quenching position of the rotating ring is at the lowest point of the quenching tank Process as a benchmark, turn over many times, and control the stress of the machine; after processing, perform dimensional inspection, non-destructive testing, and check the hardness of the quenching position. The invention is used for quenching of rotating rings.
Description
technical field [0001] The invention relates to a quenching method, in particular to a quenching method for a rotating ring used in a steam turbine. Background technique [0002] swivel ring (see figure 1 ) is a component on the rotating diaphragm of the steam turbine. The steam supply of the steam turbine is adjusted through the movement of the rotating ring. When the rotating ring moves, it rubs against the self-lubricating alloy. If the hardness is poor, it is necessary to harden the contact part between the rotating ring and the self-lubricating alloy. The traditional technology uses the integral oil quenching technology to harden the rotating ring as a whole, which causes processing difficulties after the integral treatment. In addition, the integral oil quenching has a large energy demand, high cost, and a long cycle. In addition, the integral oil quenching technology does not Conducive to environmental protection. [0003] To sum up, the existing rotating ring quen...
Claims
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