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The honing method of the inner hole of the main steam valve regulating valve of the steam turbine

A honing process and main steam valve technology, applied in the field of mechanical processing, can solve the problem of high roughness of the inner hole of the steam turbine main steam valve regulating valve, and achieve stable and reliable quality

Active Publication Date: 2016-04-13
HARBIN TURBINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a honing processing method for the inner hole of the main steam valve regulating valve of the steam turbine in order to solve the problem of high roughness of the inner hole of the main steam valve regulating valve of the steam turbine obtained by the existing processing method

Method used

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  • The honing method of the inner hole of the main steam valve regulating valve of the steam turbine

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Experimental program
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specific Embodiment approach 1

[0013] Specific implementation mode 1: The honing processing method of the inner hole of the main steam valve regulating valve of the steam turbine in this embodiment is implemented in the following steps:

[0014] 1. Measure the size of the inner hole of the main steam valve regulating valve of the steam turbine and the outer diameter of the guide sleeve, remove the burrs on the inner hole of the main steam valve regulating valve of the steam turbine and the outer circle of the guide sleeve, and then put the main steam valve regulating valve of the steam turbine into heating The furnace is heated to 180°C~250°C, held for 3.5 to 4.5 hours, and then the furnace is opened and taken out to obtain a heated steam turbine main steam valve regulating valve;

[0015] 2. Put the guide sleeve into the inner hole of the main steam valve regulating valve of the steam turbine, and cool it to room temperature naturally, to obtain the assembled steam turbine main steam valve regulating valve;

[00...

specific Embodiment approach 2

[0020] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the material of the main steam valve regulating valve and guide sleeve of the steam turbine described in step 1 is 38CrMoAl. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0021] Specific embodiment three: This embodiment is different from specific embodiment one or two in that the thickness of the nitride layer obtained by the nitriding treatment in step four is 0.3-0.5 mm. Other steps and parameters are the same as those in the first or second embodiment.

[0022] The surface hardness HV of the main steam valve regulating valve of the steam turbine after nitriding in this embodiment is not less than 650, and the brittleness is not more than grade 3.

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Abstract

The invention belongs to the field of machining, and particularly relates to a honing method of an inner hole of a regulating valve of a main steam valve of a steam turbine. The honing method mainly solves the problem that an inner hole, formed with an existing machining method, of the regulating valve of the main steam valve of the steam turbine is high in roughness. The honing method comprises the following steps that firstly, the regulating valve of the main steam valve of the steam turbine is placed in a heating furnace and heated; secondly, a guide sleeve is assembled in the inner hole of the regulating valve of the main steam valve of the steam turbine in a sleeved mode; thirdly, rough honing oilstone is adopted, honing parameters are adjusted, and rough honing is conducted; fourthly, nitriding is conducted on the roughly-honed regulating valve of the main steam valve of the steam turbine; fifthly, fine honing oilstone is adopted, the honing parameters are adjusted, and fine honing is conducted. According to the honing method, cutting parameters are adjusted reasonably, surface roughness of the honed inner hole reaches Ra (0.025-0.5) microns, precision of the honed inner hole reaches IT6-IT7, and quality is stable and reliable.

Description

Technical field [0001] The invention belongs to the field of mechanical processing, and particularly relates to a honing processing method for the inner hole of a main steam valve regulating valve of a steam turbine. Background technique [0002] Honing is essentially low-speed grinding, that is, the workpiece is installed in a fixture on the worktable, and the honing head is driven by the machine tool spindle to rotate and make an axial reciprocating movement. The oil stone on the honing head is subjected to a certain pressure (including the centrifugal force when the honing head rotates). Inside) is pressed on the surface to be processed, thereby cutting off a very thin layer of metal on the workpiece, forming a cross and non-repetitive network. [0003] Due to the large diameter and long axial dimension of the main steam valve regulating valve of a steam turbine, it is difficult to use the existing conventional turning and sanding the surface of the inner hole of the main steam ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24B33/02B24B33/08
CPCB24B33/02B24B33/06B24B33/083
Inventor 陈永亮张彦成国富王淑琴赵军
Owner HARBIN TURBINE