专利汇可以提供Method of electrical discharge surface repair of a variable vane trunnion专利检索,专利查询,专利分析的服务。并且A method of repairing a variable vane (120) for a gas turbine engine includes the steps of positioning a trunnion (34) of a variable vane (120) within an electrical discharge machine environment, and connecting the trunnion (34) as a first electrode through an electrical discharge machine power generator (36) to a second electrode (132). The second electrode (132) is formed of a hard metal coating. A spark (250) is created between the trunnion (34) and the second electrode (132) such that material from the second electrode (132) is deposited on an outer surface of said trunnion (34).,下面是Method of electrical discharge surface repair of a variable vane trunnion专利的具体信息内容。
This application relates to a method of repairing a surface coating on a trunnion associated with a gas turbine engine variable vane.
Gas turbine engines are provided with vanes, which are positioned intermediate compressor rotors. The angle of incidence of a variable vane can be changed by pivoting the variable vane on a trunnion, which is received within a bearing. The variable vanes may be exposed to extremely high temperatures, and thus may be provided with a hard metal coating for wear protection. As an example, tungsten carbide coatings are often utilized.
As a result of engine operation and environmental conditions, the coating can wear. At least some known methods of repairing a trunnion include to grind or otherwise mechanically machine-off the prior coating, and then re-coat the trunnion. Inevitably, during the machining process, some of the base material is removed together with the coating. This limits the ability to repair the part more than two or three times, as the trunnion will usually become undersized and will no longer meet acceptable government and/or industry requirements for returning the part back to service.
Electric discharge machining repair of various surfaces is also known. However, this surface repair has typically been utilized in the mold and die industry or to form steel rolls, and not to repair a prior coating.
A method of repairing a variable vane for a gas turbine engine includes the steps of positioning a trunnion of a variable vane within an electrical discharge machine environment, and connecting the trunnion as a first electrode through an electrical discharge machine power generator to a second electrode. The second electrode (tool) is formed of a hard metal coating material. A spark is created between the trunnion and the tool electrode such that material from the tool electrode is deposited on an outer surface of said trunnion.
A variable vane for a gas turbine engine includes a vane having a trunnion at one end. The trunnion has outer surface provided with a hard metal coating. The outer surface of the hard metal coating includes a recast layer, a modified region positioned on an inner side of the recast layer, and a base material positioned on an opposed side of the modified region from the recast layer
These and other features of this disclosure can be best understood from the following specification and drawings, the following of which is a brief description.
A gas turbine engine 10, such as a turbofan gas turbine engine, circumferentially disposed about an engine centerline, or axial centerline axis 12 is shown in
A variable vane 120, as may be incorporated into the compressor section 16 of
The electrode 132 may be formed of a hard metal coating, and in particular is formed of the coating that is to be deposited on the trunnion 34. In an exemplary embodiment, this coating is tungsten carbide.
During operation of the electrical discharge machine assembly, the material of the electrode 132 is eroded and redeposited onto the trunnion 34. Additionally, some of the old coating is removed as the material of the electrode 132 is deposited as the new coating. Compared to at least some known coating removal methods, little if any of the base material will be removed by the exemplary method.
As shown in
The reconditioning of the prior hard metal coating is thus provided with the electrode discharge machine sparking to provide a spark 250, along with redeposit of new material on the coating. The bond orientation has no significant effect on tensile or fatigue properties, due to the ability of incorporating a sufficient amount of the tungsten carbide recast layer on the prior coating. There is a lesser likelihood of bond defects, abnormal grain structure or porosities than with the prior art method. Further, there is no restriction on repairing a complex component.
Although this disclosure has been discussed with respect to an exemplary embodiment, a worker of ordinary skill in this art would recognize that certain modifications would come within the scope of this disclosure. For that reason, the following claims should be studied to determine the true scope and content of this disclosure.
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