JP5510137B2 - Repair method and integrated impeller - Google Patents

Description

  The present invention relates to a repair method for repairing a moving blade of an integrated impeller (blisk) and the like.

  In recent years, in the field of aircraft engines, in order to improve mechanical strength and lightness, an integrated impeller (blisk) in which a disk and a moving blade are integrated is applied as a rotor of a compressor or a turbine. It is like that. Along with that, various developments have also been made regarding the repair of moving blades of an integrated impeller, and the applicant of the present application has also developed and applied for a repair method for repairing moving blades of an integrated impeller, and the contents of the application are also included. Published (see Patent Document 1). The repair method according to the prior art will be briefly described as follows.

  First, the defect (damaged part) generated in the moving blade is removed while leaving the root portion (blade root portion) of the moving blade. Then, a plurality of support members having a support surface corresponding to the shape of the blade surface of the root portion are used, and a plurality of support members are integrally coupled by TIG welding or the like, and a plurality of support members are formed by TIG welding or the like. The support unit is integrally connected to the disc of the integrated impeller. Thereby, it can support in the state which surrounded the root part with the support surface of a plurality of support members.

  Next, using a repair blade with the base end surface having the same size as the tip end surface of the root portion, with the tip end surface of the root portion and the top surface of the support unit positioned on the same plane (same plane), by friction welding The base end face of the repair wing is joined to the tip face of the root part. Thereby, the joined body which consists of a repair wing | blade, a root part, and a support unit can be formed.

  Finally, the port unit is removed from the joined body by machining to finish the joined body to the original shape of the rotor blade. Thereby, the integrated impeller can be restored to the original state.

JP 2009-39746 A

  By the way, in order to improve the repair accuracy of the moving blade by joining the base end surface of the repair blade to the tip surface of the root portion with friction bonding, sufficiently secure the welded part (welding area) by TIG welding etc. During the friction welding, it is necessary to firmly support the blade surface at the root portion from the support surfaces of the plurality of support members. On the other hand, when the welded part by TIG welding or the like is enlarged, the metal structure of the base part is changed due to heat conduction during welding, and there is a possibility that the mechanical strength of the base part is lowered. That is, there is a problem that it is not easy to improve the repair accuracy of the moving blade by joining the base end surface of the repair blade to the tip surface of the root portion with high precision by friction bonding while maintaining the mechanical strength of the root portion. is there.

  The above-mentioned problem occurs not only for repairing the moving blade of the integrated impeller, but also for repairing the protruding member protruding from the component base in the metal part including the moving blade of the integrated impeller.

  Accordingly, an object of the present invention is to provide a repair method or the like having a novel configuration that can solve the above-described problems.

  A first feature of the present invention (a feature of the invention according to claim 1 or claim 2 of the present application) is a repair method for repairing a moving blade of an integrated impeller (one of metal parts). A defect removing step (damaged portion removing step) for removing a defect (damaged portion) generated in the moving blade while leaving a root portion (blade root portion), and a blade surface shape of the root portion after completion of the defect removing step Using a plurality of support members having a support surface corresponding to (one of the side shapes), a plurality of the support members are integrally coupled by tightening a coupling screw, and a plurality of the aforementioned support members are coupled by tightening a sub coupling screw A support step of supporting the support unit in a state of surrounding the blade surface of the root portion by the support surfaces of the plurality of support members by integrally coupling a support unit made of a support member to the disk of the integrated impeller; and Previous After completion of the support process, a repair wing (one of repair parts) having a surplus (surplus part) so that the base end surface is larger than the tip end surface of the root part, With the top surface of the support unit positioned on the same surface, by joining the base end surface of the repair blade to the tip surface of the root portion and the top surface of the support unit by friction bonding, the repair blade and A friction joining step of forming a joined body composed of the root portion and the support unit; and after the friction joining step, the surplus material of the support unit and the repair blade is removed from the joined body, and the joining is performed. And a finishing step of restoring the integrated impeller to its original state by finishing the body to the original shape of the moving blade.

  According to the first feature, the repair blade having the surplus wall is used so that the base end surface is larger than the tip end surface of the root portion, and the base end surface of the repair blade is connected to the tip end surface of the root portion by friction bonding. In addition, since it is joined to the top surface of the support unit, not only the root portion but also the support unit (by the cooperation between the base end surface of the repair blade and the outer peripheral surface of the disk) during friction welding. A plurality of the support members) are sandwiched. Thereby, without using a welding method such as TIG welding, it is possible to tighten the coupling screw and the sub coupling screw, and during friction welding (during the friction welding process), the support portion of the plurality of support members can support the root portion. The blade surface can be firmly supported.

  A second feature of the present invention (a feature of the invention according to claim 3 of the present application) is used for an aircraft engine, and includes a disk and a plurality of moving blades integrally formed on the outer peripheral surface of the disk at equal intervals. In the integrated impeller (blisk), at least one of the moving blades has been repaired based on the repair method according to the first feature.

  A third feature of the present invention (a feature of the invention according to claim 4 or claim 5 of the present application) is a repair method for repairing a protruding member protruding from a component base in a metal part, leaving a base portion of the protruding member. On the other hand, a defect removing step (damaged portion removing step) for removing a defect (damaged portion) generated in the protruding member, and a plurality of support surfaces corresponding to the side surface shape of the root portion after the defect removing step is completed. A plurality of support members are integrally coupled by tightening a coupling screw, and a support unit comprising the plurality of support members is integrally coupled to the component base by tightening a sub coupling screw. A support step for supporting the support member in a state in which a side surface of the root portion is surrounded by the support surfaces of the plurality of support members, and the end of the support step. Later, using a repair part having a surplus portion (surplus portion) so that the base end surface is larger than the tip end surface of the root portion, the tip end surface of the root portion and the top surface of the support unit are on the same plane. In a state where the repair part is positioned, the base part of the repair part is joined to the distal end surface of the root part and the top surface of the support unit by friction joining, thereby joining the repair part, the root part, and the support unit. After the completion of the friction joining step for forming a body and the friction joining step, the surplus of the support unit and the repair part is removed from the joined body, and the joined body is finished to the original shape of the protruding member. Thus, the gist is provided with a finishing step of restoring the metal part to its original state.

  “Metal part” means an integrated impeller, and “base part” means an integrated impeller disk, and “projection member” means an integrated impeller. Including the moving blade of a car.

  According to the third feature, the repair part having the surplus wall is used so that the base end surface becomes larger than the front end surface of the root part, and the base end surface of the repair part is connected to the front end surface of the base part by friction bonding. In addition to being joined to the top surface of the support unit, during the friction welding, not only the base portion but also the support unit (by the cooperation between the base end surface of the repair part and the outer peripheral surface of the disk) A plurality of the support members) are sandwiched. Thereby, without using a welding method such as TIG welding, it is possible to tighten the coupling screw and the sub coupling screw, and during friction welding (during the friction welding process), the support portion of the plurality of support members can support the root portion. The side surface can be firmly supported.

  According to the invention described in any one of claims 1 to 3 of the present application, it is possible to perform friction welding by simply tightening the coupling screw and the sub coupling screw without using a welding method such as TIG welding. In the inside, since it is possible to firmly support the blade surface of the root portion from the support surfaces of the plurality of support members, the base end surface of the repair blade is fixed by friction bonding while maintaining the mechanical strength of the root portion. It is possible to sufficiently improve the repair accuracy of the moving blade by joining the tip portion of the root portion with high accuracy.

  According to the invention described in claim 4 or claim 5 of the present application, a plurality of the support members can be formed during friction joining by simply tightening the coupling screw and the sub coupling screw without using a welding method such as TIG welding. Since the side surface of the root portion can be firmly supported from the support surface of the base portion, the base end surface of the repaired part is highly accurately attached to the distal end surface of the root portion by friction bonding while maintaining the mechanical strength of the root portion. It is possible to sufficiently improve the repair accuracy of the protruding member.

FIG. 1A is a schematic diagram showing a moving blade before repairing based on the repairing method according to the embodiment of the present invention, and FIG. 1B is the repairing method according to the embodiment of the present invention. It is a schematic diagram explaining a defect removal process. FIG. 2 is a perspective view illustrating a support process in the repair method according to the embodiment of the present invention. FIG. 3A is a schematic diagram for explaining a support process in the repair method according to the embodiment of the present invention, and FIG. 3B is a schematic diagram showing a friction joining process in the repair method according to the embodiment of the present invention. It is a typical figure. FIG. 4A is a schematic diagram illustrating a friction joining process in the repair method according to the embodiment of the present invention, and FIG. 4B illustrates a finishing process in the repair method according to the embodiment of the present invention. It is a schematic diagram. FIG. 5 is a perspective view of the first support member and the second support member used in the repair method according to the embodiment of the present invention. FIG. 6 is a partial perspective view of an integrated impeller that is a repair target of the repair method according to the embodiment of the present invention.

  Hereinafter, with reference to FIG. 1 to FIG. 6, the integrated impeller that is a repair target of the repair method according to the embodiment of the present invention, the first support member and the second used in the repair method according to the embodiment of the present invention. Specific details of the support member and the repair method according to the embodiment of the present invention will be sequentially described. In the drawings, “FF” indicates the forward direction, and “FR” indicates the backward direction.

  As shown in FIG. 6, an integrated impeller (blisk) 1 to be repaired by a repair method according to an embodiment of the present invention is used for a compressor or turbine of an aircraft engine, and is made of nickel alloy or titanium. It is made of an alloy. The integrated impeller 1 includes a circular disk 3 and a plurality of moving blades 5 integrally formed on the outer peripheral surface of the disk 3 at intervals. Here, each rotor blade 5 has a root portion (blade root portion) 7 on the proximal end side.

  Next, specific configurations of the first support member 9 and the second support member 11 will be described with reference to FIG.

  As shown in FIG. 5, the first support member 9 is made of stainless steel and has a first support surface 9 s that supports the ventral wing surface 7 a of the root portion 7. Moreover, the 1st protrusion piece 13 which can contact | abut to the periphery (front side periphery or back side periphery) of the disk 3 is formed in the both ends side of the 1st support member 9, respectively. Further, insertion holes (bolt holes) 17 into which coupling bolts (an example of coupling screws) 15 can be inserted are formed at both ends of the first support member 9, and the respective insertion holes 17 in the first support member 9 are formed. A pin hole 21 that can engage with the positioning pin 19 is formed at a position adjacent to.

  The second support member 11 is made of stainless steel and has a second support surface 11 s that supports the back side wing surface 7 b of the root portion 7. Moreover, the 2nd protrusion piece 23 which can contact | abut to the periphery (front side periphery or back side periphery) of the disk 3 is formed in the both ends side of the 2nd support member 11, respectively. Further, screw holes 25 that can be aligned with the insertion holes 17 of the first support member 9 and can be screwed with the coupling bolts 15 are formed at both ends of the second support member 11, respectively. A pin hole 27 that can be aligned with the pin hole 21 of the first support member 9 and engage the positioning pin 19 is formed at a position adjacent to each screw hole 25. Further, each second projecting piece 23 is formed with a screw hole 31 that can be screwed into a sub coupling bolt (an example of a sub coupling screw) 29 (see FIG. 2).

  Next, specific contents of the repair method according to the embodiment of the present invention will be described with reference to FIGS.

  The repair method according to the embodiment of the present invention is a repair method for repairing the moving blade 5 of the integrated impeller 1 and includes a defect removal process (damaged part removal process), a support process, a friction joining process, and a finishing process. It has. And the concrete content of each process is as follows.

(i) Defect Removal Step As shown in FIGS. 1 (a) and 1 (b), the defect (damaged portion) D generated in the moving blade 5 is machined while leaving the base portion (blade root portion) 7 of the moving blade 5. Remove. The remaining root portion 7 has a predetermined length from the outer peripheral surface of the disk 3.

(ii) Supporting Step After the defect removal step, as shown in FIGS. 2 and 3A, one first protruding piece 13 is brought into contact with the front peripheral edge of the disk 3, and the other first protruding piece. The first support member 9 is set on the disk 3 so that 13 is brought into contact with the rear edge of the disk 3. Further, the second support member 11 is placed on the disk 3 such that one second protruding piece 23 is brought into contact with the front peripheral edge of the disk 3 and the other second protruding piece 23 is brought into contact with the rear peripheral edge of the disk 3. Set to. Next, the pair of positioning pins 19 are engaged with the pin holes 21 of the first support member 9 and the pin holes 27 of the second support member 11 in a corresponding relationship. Then, in a state where the pair of coupling bolts 15 are inserted through the insertion holes 17 of the first support member 9 in a corresponding relationship, the pair of coupling bolts 15 are respectively inserted into the screw holes 25 of the second support member 11 in a corresponding relationship. By screwing and tightening, the first support member 9 and the second support member 11 are integrally coupled. Further, the pair of sub coupling bolts 29 are respectively screwed into the corresponding screw holes 31 of the second support member 11 and tightened to press the peripheral edge of the disk 3 from the front and rear by the tip portions of the pair of sub coupling bolts 29. Then, the support unit U including the first support member 9 and the second support member 11 is integrally coupled to the disk 3. As a result, the first support surface 9s of the first support member 9 and the second support surface 11s of the second support member 11 support the blade surface of the root portion 7 (the ventral blade surface 7a and the back blade surface 7b) in a surrounding state. can do.

  Here, on the top surface side of the support unit U, a protruding portion Up that surrounds the distal end side periphery of the blade surfaces 7a and 7b of the root portion 7 is formed.

(iii) Friction welding process After the support process is completed, as shown in FIG. 3B, the disk 3 is set in a friction welding device (mostly not shown). In addition, the repair blade 33 having a surplus portion 33e and having a retained portion 33g formed on the outer peripheral surface so that the base end surface is larger than the distal end surface of the root portion 7 is used, and the repair blade is repaired by the holder 35 of the friction welding apparatus. By holding the held portion 33g of 33, the repair blade 33 is set in the friction welding apparatus. Here, the repair blade 33 is made of a nickel alloy or a titanium alloy, and the contour (contour shape) of the base end surface of the repair blade 33 is the same as the contour of the tip surface of the protruding portion Up of the support unit U. Yes.

  The repair blade 33 is reciprocally slid in the same plane (same plane) while pressing the base end surface of the repair blade 33 against the tip surface of the root portion 7 and the top surface of the support unit U. With the surface and the top surface of the support unit U positioned on the same surface, the base end surface of the repair blade 33 is fixed to the distal end surface of the base portion 7 and the support unit U by friction welding (specifically, linear friction welding). Join to top surface. Thereby, the joined body Z which consists of the repair wing | blade 33, the root part 7, and the support unit U can be formed.

(iv) Finishing step After the friction joining step, as shown in FIG. 4A, the pin holes 21 of the first support member 9 and the pin holes of the second support member 11 having a pair of positioning pins 15 in a corresponding relationship. Separate from 27 respectively. In addition, the pair of coupling bolts 15 are loosened and separated from the screw holes 25 of the corresponding second support member 11, and the pair of sub coupling bolts 29 are loosened to correspond to the corresponding second support member 11. It is made to detach | leave from the screw hole 31, respectively. Then, the support unit U and the excess wall 33e of the repair blade 33 are removed from the joined body Z by machining, and the joined body Z is finished to the original shape of the moving blade 5. Thereby, the integrated impeller 1 can be restored to the original state.

  The support unit U can be removed from the joined body Z simply by removing the joint portion between the base end surface of the repair blade 33 and the top surface of the support unit U by machining.

  Thus, a series of steps of the repair method according to the embodiment of the present invention is completed.

  Then, the effect | action and effect of embodiment of this invention are demonstrated.

  The repair blade 33 having the surplus thickness 33e is used so that the base end surface is larger than the tip end surface of the root portion 7, and the base end surface of the repair blade 33 is not only the tip end surface of the root portion 7 but also the support unit U by friction welding. Therefore, during friction welding, not only the base portion 7 but also the support unit U (the first support member 9 and the first support member 9) are supported by the cooperation between the base end surface of the repair blade 33 and the outer peripheral surface of the disk 3. 2 support member 11) can be clamped. As a result, the first support surface 9s and the first support surface 9s of the first support member 9 can be obtained during friction welding (during the friction welding process) by simply tightening the coupling bolt 15 and the sub coupling bolt 29 without using a welding method such as TIG welding. 2 The wing surfaces 7 a and 7 b of the root portion 7 can be firmly supported by the second support surface 11 s of the support member 11.

  Therefore, according to the embodiment of the present invention, the base end surface of the repair blade 33 is joined to the distal end surface of the base portion 7 with high accuracy by friction bonding while maintaining the mechanical strength of the root portion 7, and the moving blade 5 The repair accuracy can be improved sufficiently.

  The present invention is not limited to the description of the above-described embodiment, and the repair method according to the embodiment of the present invention is applied to repair of protruding members of metal parts other than the moving blade 5 of the integrated impeller 1. The present invention can be implemented in various other modes. Further, the scope of rights encompassed by the present invention is that the integrated impeller 1 including the moving blade 5 repaired based on the repair method according to the embodiment of the present invention (in other words, the restored integrated impeller). It is not limited to these embodiments, such as extending to 1).

DESCRIPTION OF SYMBOLS 1 Integrated impeller 3 Disc 5 Rotor blade D Defect 7 Root part 7a Ventral side blade surface of blade root part 7b Back side blade surface of blade root part 9 1st support member 9s 1st support surface 11 2nd support member 11s 2nd support surface 13 First projecting piece 15 Coupling bolt 17 Insertion hole 19 Positioning pin 21 Pin hole 23 Second projecting piece 25 Screw hole 27 Pin hole 29 Sub coupling bolt 31 Screw hole U Support unit Up Protrusion part of support unit Z Joint 33 Repair blade 33e Repair blade surplus 33 g Repair blade holding part 35 Friction welding device holder

Claims (5)

In the repair method to repair the moving blade of the integrated impeller,
A defect removing step for removing defects generated in the blade while leaving the root of the blade,
After completion of the defect removal step, a plurality of support members having a support surface corresponding to the shape of the blade surface of the root portion are used, the plurality of support members are integrally coupled by tightening a coupling screw, and a sub A base unit blade is surrounded by the support surfaces of the plurality of support members by integrally connecting a support unit composed of the plurality of support members to a disk of the integrated impeller by tightening a coupling screw. Support process to support in the state,
After completion of the support step, a repair blade having a surplus wall is used so that the base end surface is larger than the tip surface of the root portion, and the tip surface of the root portion and the top surface of the support unit are on the same plane. In a state where the repair blade is positioned, the base end surface of the repair blade is joined to the tip surface of the root portion and the top surface of the support unit by friction welding, thereby joining the repair blade, the root portion, and the support unit. A friction joining process for forming a body;
After completion of the friction welding process, the support unit and the surplus blade of the repair blade are removed from the joined body, and the joined body is finished to the original shape of the moving blade, whereby the integrated impeller is And a finishing process for restoring the original state.   The outline of the base end face of the repair wing used in the friction joining process is the same as the outline of the tip end face of the projecting portion formed on the top face side of the support unit and surrounding the tip side peripheral edge of the wing face of the root portion. The repair method according to claim 1, wherein: In an integrated impeller that is used in an aircraft engine and includes a disk and a plurality of moving blades integrally formed on the outer peripheral surface of the disk at equal intervals.
An integrated impeller characterized in that at least one of the moving blades is repaired based on the repairing method according to claim 1 or 2. In a repair method for repairing a protruding member protruding from a component base in a metal component,
A defect removing step for removing defects generated in the protruding member while leaving the base portion of the protruding member;
After completion of the defect removal step, a plurality of support members having a support surface corresponding to the side surface shape of the root portion are used, and the plurality of support members are integrally coupled to each other by tightening a coupling screw, and sub-bonding is performed. A support step of supporting the support unit in a state in which a side surface of the root portion is surrounded by the support surfaces of the plurality of support members by integrally coupling a support unit including the plurality of support members to the component base by tightening screws. When,
After completion of the support step, a repair part having a surplus thickness is used so that the base end surface is larger than the tip end surface of the root portion, and the tip end surface of the root portion and the top surface of the support unit are on the same plane. In a state where the repair part is positioned, the base part of the repair part is joined to the distal end surface of the root part and the top surface of the support unit by friction joining, thereby joining the repair part, the root part, and the support unit. A friction joining process for forming a body;
After the friction joining step, the support unit and the spare parts of the repair parts are removed from the joined body, and the joined body is finished to the original shape of the projecting member, whereby the metal part is restored to the original shape. And a finishing process for restoring the state.   The contour of the base end surface of the repair part used in the friction joining process is the same as the contour of the distal end surface of the protruding portion formed on the top surface side of the support unit and surrounding the distal end side periphery of the side surface of the root portion. The repair method according to claim 4, wherein the repair method is provided.

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