Restoration method for combustion machine turbine rotor hub mortise
A rotor hub and repair method technology, applied in the direction of metal material coating process, coating, etc., can solve the problems of heat-affected zone influence and non-seeing, and achieve the effect of ensuring mechanical properties
Active Publication Date: 2017-04-05
上海大陆天瑞激光表面工程有限公司
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Problems solved by technology
[0012] 5. The influence of the heat-affected zone
[0013] According to the applicant's search and verification: there is no domestic precedent for the repair of gas turbine tenon teeth by laser cladding, and no relevant reports have been seen abroad.
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[0039] A Shanghai Power Generation Co., Ltd., 9E unit gas turbine rotor 2nd and 3rd stage moving impeller hub tongue and groove non-working surface laser repair, material is 15CrMo V. Before the repair, due to the long-term low-speed cranking of the gas turbine, the mating surfaces of the second and third stage hubs of the turbine rotor and the moving blade roots and grooves were severely worn, and the fit clearance exceeded the allowable standard. In addition, the wear of the tongue and groove of the hub is non-uniform wear, and the damage is inclined. The wear on the inlet side of the tongue groove is about 0.1mm. Abrasion on the outlet side: the first-stage tooth is 0.35mm, the second-stage tooth is 0.30mm, and the third-stage tooth is 0.25mm.
[0040] The repair process provided by the present invention.
[0041] 1. Inspection before the tooth groove repair: the content includes the detection of the size and hardness of the first tenon tooth 2, the second tenon tooth 3, and t...
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Abstract
A restoration method for a combustion machine turbine rotor hub mortise includes the following steps that firstly, detection before restoration of a tenon tooth groove is performed; secondly, a standard gauge bar is manufactured, sizes of various levels of the mortise are measured, and the abrasion loss is calculated; thirdly, according to a detection result, a damaged portion is cleaned and subjected to rust removal, and it is guaranteed that no crack defects exist; fourthly, according to the shape of the tenon tooth groove, and a light reflecting baffle is manufactured and is attached to a work face as much as possible; fifthly, a non-work face of wheel disk tenon teeth is subjected to laser cladding, and mechanical shape restoring is performed; seventhly, the special standard gauge bar is utilized, and the size of the tenon tooth groove is detected; and eighthly, nondestructive flaw detection is performed, wherein a flaw detection agent is utilized to perform flaw detection on a cladding layer, and it is guaranteed that no crack, gas hole and slag inclusion defects exist after flaw detection.
Description
Technical field [0001] The invention relates to a method for repairing components of a gas turbine, in particular to a method for repairing non-contact surface damage of the tongue and groove of a gas turbine hub by using laser cladding technology. Background technique [0002] The gas turbine is a new type of power machinery that emerged in the 20th century. The existing gas turbine works in an open cycle heated by isobaric combustion. It is composed of a compressor, a combustion chamber and a turbine. It directly burns the heat generated by the fuel. Rotary power machinery that converts mechanical work into external output. It has obvious advantages such as small size, light weight, fast starting, high efficiency and low pollution emission. For the peak shaving operation of the power grid, the long-term low-speed cranking results in serious wear of the matching surfaces of the turbine rotor hub, moving blades and tenon teeth. The clearance between the blades and the hub exceed...
Claims
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IPC IPC(8): C23C24/10
CPCC23C24/10
Inventor 崔波赵文良吴伟
Owner 上海大陆天瑞激光表面工程有限公司