CN104067000B - Repair the method for wear trace on the rotor of by-pass type electromotor blower fan that supports - Google Patents
Repair the method for wear trace on the rotor of by-pass type electromotor blower fan that supports Download PDFInfo
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- CN104067000B CN104067000B CN201380006471.7A CN201380006471A CN104067000B CN 104067000 B CN104067000 B CN 104067000B CN 201380006471 A CN201380006471 A CN 201380006471A CN 104067000 B CN104067000 B CN 104067000B
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Abstract
A kind of method that the present invention relates to repairing rotor flange (43), the draught fan wheel disc (20) in upstream turbine blower fan electromotor is fixed in the lateral surfaces of flange.Described flange includes the opening and centre so-called exhaust openings (43D) being connected on wheel disc (20) circlewise.Wear trace (T) is formed because fan blade rubs on flange.Described method is included in the step processing spot face (43) in belt wear marked region on flange, and the exhaust openings (43D) covered by blade during so-called wear-resisting plug (50,150) is put into friction.Described method is characterised by, spot face (43L) extends between connection opening (43D) and circumferentially limited by the clamping surface of the connection between wheel disc and flange.
Description
Technical field
The present invention relates to gas-turbine unit field, particularly to the jet engine with preposition blower fan.
Background technology
The many air-flows jet engine fan rotor installed on civil aircraft includes by the shaft-driven wheel disc of low pressure
And the multiple blades around wheel disc.These blades radially extend relative to engine axis, it form swallow
The end of tail cross section is fixed, and these ends are all placed in what wheel disc wheel rim in a generally axial direction was processed
In respective slots.In the downstream immediately of draught fan wheel disc, and constitute same rotor, be air-boost compressor
(boost compressor).This air-boost compressor is drum form, and includes several leaf-level.
In one embodiment, draught fan wheel disc is by being bolted on the radial flange of its upstream face
It is fixed on the drum of air-boost compressor.It addition, this flange has scallop axially retains wind to be formed
The device of machine wheel disk blade.To this end, each blade root is in the axially-extending portion being provided with referred to as hook portion downstream
Point, this axial continuation is with two radial direction side channels.This hook portion at radial slot with above-mentioned booster-type pressure
Scallop on mechanism of qi flange is meshed, in order to prevent it from any moving axially occur.
When electromotor is on ground, blower fan there will be rotation under the wind action on fan blade.This existing
As the tangential deformation of fan blade can be caused.Then, between swallow-tail form root and platform, form the leaf of petiole
Sheet part can via transverse edge downstream the upstream flange of the air-boost compressor drum that rubs.Then, this
Individual action causes friction, and this friction causes being positioned on the inward flange upstream face of region, draught fan wheel disc slit extension
Noticeable abrasion occurs.
The most this abrasion exceedes certain degree of depth, on the one hand can affect component life, on the other hand can be at blade
Their integrity is affected in the case of loss.
A problem relevant to this wear phenomenon is because these regions and there is boring, and these borings are
It is used for eliminating the mechanical stress on flange.These borings referred to as stress relieving hole, generally with the most simply moulding
Material plug closure.In band boring region, the blade being resisted against on flange itself can be corroded.Therefore, leaf
Abrasion on handle is uneven.The surface of petiole downstream face is only in its regions wear with Hp contacts；And
In the face of the surface portion of boring then will not be worn and torn, and, if things go on like this, become increasingly conspicuous.Except this blade
Outside wear phenomenon, between blade and flange, also can develop into gap.
The present patent application person is it is proposed that arrange a kind of resilient snubber, to avoid between flange and blade grip
This contact.But, this solution that EP 1 873 401 is introduced can not solve to exist on flange
The situation of wear trace.
Have already been proposed the solution repairing flange.These solutions first, by scraping aperture
Plane, is reconstructed the reference surface towards blade root the most again, thus eliminates frayed region.Rear one
Kind of operation uses the stopper of referred to as wear-resisting plug, and this is wear-resisting stoppers in the stress relieving hole loading drum tightly.
Wear-resisting plug can use composite or metal to make.The advantage of composite be its rate of wear far away
Less than metal.It addition, when requiring replacement, it is also easier to remove.But, when installing blade, they
Not there is enough mechanical integrities.To this end, wear-resisting plug generally uses metal to make, but, risk is,
Need to carry out assembly or disassembly operation to check the material situation in pressure-charge compressor drum stress relieving hole
Period, compressor drum can damage.
Exactly, shortcoming is as follows:
When installing wear-resisting plug, there is the risk causing defect.
Installing wear-resisting plug is a craftsmenship job, because wear-resisting plug must slide in load hole, but must also
It is observed that minimal shrink, in order that retaining minimum of contraction amount in ensureing the most wear-resisting plug chamber.This
Can be realized by heating drum and the wear-resisting plug of cooling.Need sizable temperature difference, more than 300 DEG C.
Repairing sufficiently expensive, it is desirable to be processed numerous spot faces, its quantity is identical with fan blade,
And the assembling work of equivalent amount.
Repair work must be carried out at dedicated workshop, it means that parts or even electromotor need to stop work
Make.
Every time during dismounting operation, the boring on drum all must bore hole again；Which has limited in the drum whole longevity
The replacing number of times that can carry out during life.
At least can partly solve the scheme of these defects as one, applicant company proposes improvement, can make
The installation of wear-resisting plug is the easiest；Such as, in patent application FR2 929 660, wear-resisting plug in two sub-sections,
Stand the upstream metal part of friction stree and make installation and removal operation the easiest downstream parts of plastics.
In FR 2 948 725 patent application, wear-resisting plug is arranged so as to, and i.e. it is only pacified from drum upstream
Assembly and disassembly.
FR 10 60 087 patent application proposes installs and superposition ring liner between wheel disc and flange, shape
The blade put in becoming axial support surface, slit is just against on a surface.When having found that blade root rubs
And when there is wear trace, this solution can simplify the repairing of rotor.What is required is simply that replacing annular lining
Pad.Described liner yet forms both the device closing stress relieving hole.To this end, there is no need again for stress relieving
Hole provides blocking.Flange can be processed loop turn, in order to accommodate liner.This solution is especially suitable for
Repair the rotor initially not having ring liner, loop turn is machined with enough degree of depth more weak portion with removing component
Point, and ring liner is in place.When adopting in this way, the wear reason of ring just can be got rid of, wheel disc
With the datum level between ring is recovered.
Applicant company oneself proposes the target of the another kind of repair method of exploitation.This target is just by can
The repairing leaned on, until component life terminates.Additionally, it is possible to reduce rapid-maintenance cost, repair cost is certainly
Less than the cost using new parts to be replaced.It addition, the abrasion on the most removable flange front end face, it is not necessary to
Change the axial location of opposite blade.
Summary of the invention
These targets can realize by processing the spot face being optimized with wear trace region.
More precisely, according to the present invention, in the electromotor with upstream turbine blower fan, described method relates to
And to repairing the flange of rotor, the transverse end surface of described rotor being fixed with draught fan wheel disc, described flange exists
The opening of referred to as stress relieving opening between opening and these openings being connected on wheel disc is included in annular,
Wear trace is formed because fan blade rubs on flange.
Described method includes that two steps, a step are processing holes on the flange in belt wear mark region
Mouth plane, another step is storing pin in the stress relieving opening that may be covered by blade during rubbing
(referred to as hard-wearing pin), described method is characterised by, spot face is connecting extension between opening, and
Along the circumferential direction between clamped region or wheel disc and flange, connection surface is limited.
Due to this characteristic, the clamping conditions between draught fan wheel disc and flange would not allow people's doubt.
According to another characteristic, two each spot faces connected between opening are by two radial oriented limits
Boundary is fixed, and at least one of which border is positioned at the outside in stress relieving hole.Avoid spot face border through answering
Power eliminates hole, can reduce the risk forming region of stress concentration, because this area of stress concentration can cause crackle.
Advantageously, the degree of depth of spot face is confirmed as obtaining enough spot face process along described border
Base radius (base radius), to avoid occurring that stress is concentrated along described border, limits effectively simultaneously
The minimizing of cross section.
More particularly, because flange includes the radial direction scallop accommodating the axial hook portion of blade, radial boundary footpath
To the base portion extending to scallop.In the case of leaf destruction, this solution can reduce portion
The intensity of part.It practice, blade loss can cause the various power making flange deform at scallop.
Use the base portion of the scallop with angle (chamfer), by restricted orifice plane depth, make
Its degree of depth is less than the angle degree of depth, and in the case of blade loss, the non-deformability of flange can be improved further.
According to another characteristic, band pin and the hard-wearing pin of back-up ring, being arranged in by slidable fit may be by
In the stress relieving opening that fan blade covers, described hard-wearing pin uses metal to make.The purpose of slidable fit
It is to reduce the risk to flanges break.It practice, metallic pin can be all better against various power and impact
As acted on the impulsive force on back-up ring when installing blade.Additionally, hard-wearing pin post during slidable fit and assembling
Around sufficient space is correlated with, and this can limit the risk of impact, also can limit the risk forming the groove causing crackle.
Advantageously, slidable fit is realized by assembling wear-resisting pin at stress relieving opening contract.At this
In the case of Zhong, owing to ledge surface experienced by bead, the heating of flange is all entered in terms of temperature and time
Go adjustment, in order to the residual stress after bead will not be eliminated.
According to another solution, the program avoids bringing flange the risk of damage, hard-wearing pin pin edge
Radial direction deformable, the stopper of circumferentially extending pin is arranged in side, back-up ring opposite.Or, due to wear-resisting
Pin pin radially deformable, extrudes (pinch) pin, in order to insert in opening, then,
Unclamp extruding again.
Accompanying drawing explanation
Introducing the non-limiting implementation of the present invention with reference to the accompanying drawings, other characteristic and advantage can show
Coming, accompanying drawing is as follows:
Fig. 1 is the axial section of the jet engine of the application present invention；
Fig. 2 is the jet engine fan rotor detailed perspective view of air-boost compressor upstream flange side；
Fig. 3 is the perspective view of the upstream flange of the compressor drum with spot face treatment region；
Fig. 4 shows flange front and the profile of the hard-wearing pin being arranged in stress relieving hole；
Fig. 5 shows the another kind of embodiment party installing hard-wearing pin using and not using plug-in type locking member
Formula.
Detailed description of the invention
Fig. 1 is the axial section of birotor by-pass type jet engine 1.Electromotor 1 includes the front wind of upstream
Machine 2, this front blower fan 2 with being positioned at the exhausting rotor of fan casing 3, this chassis defining Secondary Flow.Wind
The rotor 2 of machine is fixed on low-pressure compressor 4 (also referred to as air-boost compressor).By blower fan 2 and supercharging
The assembly of formula compressor composition is fixed to be formed the downstream turbine group of low-pressure turbine 8 via the interlude of the axis of centres
On part.
In the downstream of air-boost compressor 4, air is compressed further by high-pressure compressor 5.High-pressure compressor revolves
On the high pressure turbine stage 7 being fixed to drive it to rotate with turning.Compressed air enters combustor 6, combustor
6 produce hot gas in order to drive stage of turbine.
In this illustration, the present invention relates to electromotor is positioned at fan rotor 2 and low-pressure compressor rotor 4
Between part.
Fig. 2 shows with foreshortened figure and the inside in this region as viewed from upstream, for clarity,
In this region, fan blade is omitted.
Draught fan wheel disc 20 includes the slit 21 on its wheel rim.These slits are for being all orientated axially, namely
Say along engine shaft to, shown in the case of this, in curved shape.Slit with dovetail type cross section,
Radially to keep blade.Wheel rim includes the transverse radial flange 22 between slit, is used for fixing blade
Between platform (not shown).Wheel disc 20 is fixed to low-pressure compressor 40 (the also referred to as booster-type in downstream
Compressor) on.Compressor 40 includes cylindrical drum 41, is fixed with compressor blade 42 on drum 41,
It can be seen that local blade 42 in figure.In updrift side, drum is fixed in shape looped radial direction lateral flange 43,
The wheel rim of wheel disc 20 is bolted on flange 43.It is radially connected convex that wheel rim includes between slit 21
Edge 23.Each radial flange 23 bolt 24 is fixed in the upstream flange 43 of compressor.It should be noted that
Hole in compressor drum upstream flange 43 is not all to play identical effect: connecting hole 43F may insure that wheel
Dish is bolted on drum, and stress relieving hole 43D protects described connecting hole from circumferential stress stream.Spiral shell
Bolt 24 is placed in connecting hole 43F.The diameter of the connecting hole 43F diameter slightly larger than stress relieving hole 43D.At this
In the case of Zhong, between two connecting holes, it is provided with three stress relieving holes.They are all disposed within same annulus.
Air downstream in sealing-plug (not shown) blocks opening 43D and prevents drum chamber is led to along updrift side
Cross boring leakage, because updrift side pressure is relatively low.These sealing-plugs use synthetic material to make, and do not rise
Other effect.
Upstream flange 43 is with scallop 43a kept, and described scallop 43a is with radial edges also
Open towards arbor.These scallops are used for fixing leaf in the axial direction by blade hook portion being inserted
Sheet, blade hook portion is seated in the slit 21 being positioned at correspondence.This keeping method of blade is public the applicant
Patent EP 165 860 of department is described.
When electromotor is on ground, blower fan rotation is to produce the tangential deformation of fan blade.In this case,
Blade can rub with flange 43 via its petiole downstream face.The pressure of blade and action cause blade and upstream
The abrasion of both flanges.Blade grip stays the position of the wear trace T on flange 43 can be indicated in this rotor
On.These wear traces can copy the shape of blade grip cross section, i.e. rectangular shape.These vestige positions
On the prolongation filling vaned slit, specifically overlapping with stress relieving hole 43D.
The repair method of the present invention is described below.This method relates to add in each wear trace T region
The spot face 43L that work optimizes, is shown in Fig. 4.This spot face 43L by two radial boundary 43L1 and 43L2 it
Between its circumference scope, its radial extension and its degree of depth formed.Once spot face has been formed, flange
43 surfaces reconstruct by putting hard-wearing pin 50 in the stress relieving opening 43D corresponding with wheel disc 20 slit.
These hard-wearing pins are with the pin 51 being placed in corresponding aperture, and are pressed against the back-up ring 52 of spot face 43L base portion.
On drum flange 43, the doubt of bolt 24 jam is used, to hole in order to eliminate wheel disc 20 flange 23
The circumferential scope of mouth plane is limited.Particularly, wheel disc 20 flange 23 is clamped to drum by contact area
On wheel flange, this contact area is not machined out.
Additionally, the purpose of the optimization of spot face process is to shorten the service life of parts.To this end, make
At least one of which border 43L1 and 43L2 passes between two adjacent stress relieving hole 43D.In a word
Coming, this can reduce border and the risk in crack occurs in intersection, stress relieving hole.
It addition, for the service life not shortening parts, combining spot face necessary to radius along border
Between the degree of depth and reduction radial direction and circumference effective cross section, compromise.
The optimization that spot face processes further contemplates parts integrity in terms of cause load because of blade loss.
In the case of blade is lost, scallop areas at both sides clamps blade in the axial direction, and directly facilitates down
The motility of trip holding system.Therefore, the scope of spot face is in axial direction defined, in order to maximum limit
Degree reduces the most flexible impact that downstream fan blade keeps system.To this end, the footpath of scallop 43a
The not processing to edge, its thickness is constant.
About the base portion of scallop, in order to avoid contact surface contracting between blade hook portion and scallop base portion
Subtract, the degree of depth of spot face intersection between spot face and scallop base portion 43af be limited to existing tiltedly
The degree of depth of mouth.
About the degree of depth of spot face, its degree of depth removes the wear trace found at root of blade the most completely.
About the hard-wearing pin 50 being arranged in wheel disc slit correspondence stress relieving hole 43D, it is contemplated that following factor:
Collar thickness is added to maximum, in order to the mechanical integrity of back-up ring during ensureing assembling and using.
It is selected to bear assembling preciseness and there is the metal material of good abrasional behavior.Obviously, Ni-based conjunction
Gold (such as Inconel718) can meet this condition.
Slidable fit hard-wearing pin 50 in the 43D of aperture, in order to following risk will not be risked: damage and scratch titanium and close
The flange that gold is made.
A kind of slidable fit meeting this condition is to shrink assembling.This assembling relates to being come by liquid nitrogen
Cooling down hard-wearing pin, bonded block is heated to limit residual stress when will not eliminate upper strata bead
Temperature.Advantageously, shrink assembling to relate to by cooling down Inconel718 make to-196 DEG C of liquid nitrogens
Hard-wearing pin, be heated to 250 DEG C to 350 DEG C in conjunction with the parts that titanium alloy (such as TA6V) is made
Between continue for an hour.
On 160 holes, carried out the feasibility test of situation of assembling.When assembling hard-wearing pin, do not send out
Now drum is caused damage.
About other solution shrinking assembling of hard-wearing pin, as long as drum causes the risk of damage low,
And without inserting the stress relieving opening showing parts are heated, it is all feasible.
Such as, Fig. 5 shows the solution of the hard-wearing pin 150 of assembling band pin 151 and back-up ring 152, described
Hard-wearing pin includes plug-in unit 155, and these parts are inserted into side, back-up ring opposite, thus put into pin.
Pin is along longitudinally spaced apart, so, so that it may radially extending.Once it is put in hole, the most in the form of a truncated cone
Plug-in unit, is axially imported in pin, and the latter causes radial force on the wall of hard-wearing pin pin.Pass through
Screw connects or forces cooperation can obtain guide effect.
According to another embodiment, the pin of hard-wearing pin can separate, and in slightly horn mouth shape.Logical
Cross suitable tools, hard-wearing pin just can be put by the necking down of separate for pin edge and put in place.
Claims (10)
1. a method for repairing rotor flange (43), in the electromotor with upstream turbine blower fan, blower fan
Wheel disc (20) is fixed in the lateral surfaces of described rotor flange, and described flange includes being connected to wheel in annular
It is referred to as opening of stress relieving opening between connection opening (43F) and these connections opening (43F) on dish (20)
Mouthful (43D), wear trace (T) is formed because fan blade rubs on flange, described method be included in
On the described flange in wear trace region process spot face (43L) step and may be by leaf during rubbing
The step of hard-wearing pin (50,150) is put, it is characterised in that hole in the stress relieving opening (43D) that sheet covers
Mouth plane (43L) is connecting the clamping extending between opening and along the circumferential direction being connected between wheel disc and flange
Surface is limited.
Method the most according to claim 1, two each spot faces connected between opening are by two
The border (43L1,43L2) being radially orientated is limited, and at least one of them of border is at stress relieving opening
Outside.
Method the most according to claim 2, according to the method, the degree of depth of spot face (43L) is by really
It is set to and obtains enough spot face process base radius along described border (43L1,43L2), in order to avoid
Occur that stress is concentrated along described border, simultaneously the effective cross section of restricted orifice plane treatment region inward flange
Reduce.
Method the most according to claim 2, described flange includes the radial direction fan accommodating the axial hook portion of blade
Shape recess (43a), according to this method, radial boundary extends radially into the base portion of scallop.
Method the most according to claim 4, the base portion of described scallop is with angle, according to this
Method, the degree of depth of described spot face is limited to less than the degree of depth of angle.
Method the most according to claim 1, in this manner, the hard-wearing pin of band pin and back-up ring leads to
Crossing slidable fit to be arranged in the stress relieving opening that may be covered by fan blade, described hard-wearing pin uses
Metal is made.
Method the most according to claim 6, in this manner, slidable fit is by stress relieving
Opening contract assembles hard-wearing pin pin and realizes.
Method the most according to claim 1, ledge surface is through bead, predetermined to flange heating
Time also reaches predetermined temperature, in order to it will not eliminate the residual stress after bead.
Method the most according to claim 1, the radially deformable of hard-wearing pin (150) pin, radially
The stopper stretching pin is arranged on the opposite, side of back-up ring.
Method the most according to claim 1, the radially deformable of hard-wearing pin pin, described pin
Post is extruded, in order to is inserted in stress relieving opening, then unclamps extruding.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1250887 | 2012-01-31 | ||
| FR1250887A FR2986284B1 (en) | 2012-01-31 | 2012-01-31 | PROCESS FOR REPAIRING WEAR MARKS. |
| PCT/FR2013/050177 WO2013114032A1 (en) | 2012-01-31 | 2013-01-28 | Method for repairing wear marks on a rotor supporting the fan of a bypass engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104067000A CN104067000A (en) | 2014-09-24 |
| CN104067000B true CN104067000B (en) | 2016-11-30 |
Family
ID=
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1854465A (en) * | 2005-04-28 | 2006-11-01 | 通用电气公司 | Finger dovetail attachment between a turbine rotor wheel and bucket for stress reduction |
| KR100907128B1 (en) * | 2002-07-24 | 2009-07-09 | 제너럴 일렉트릭 캄파니 | Method for removing dovetail pins |
| WO2011000943A1 (en) * | 2009-07-02 | 2011-01-06 | Snecma | Propeller hub |
| CN102046923A (en) * | 2008-04-07 | 2011-05-04 | 梅森法国热纳维力埃有限公司 | Turbomachine rotor comprising an anti-wear plug, and anti-wear plug |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100907128B1 (en) * | 2002-07-24 | 2009-07-09 | 제너럴 일렉트릭 캄파니 | Method for removing dovetail pins |
| CN1854465A (en) * | 2005-04-28 | 2006-11-01 | 通用电气公司 | Finger dovetail attachment between a turbine rotor wheel and bucket for stress reduction |
| CN102046923A (en) * | 2008-04-07 | 2011-05-04 | 梅森法国热纳维力埃有限公司 | Turbomachine rotor comprising an anti-wear plug, and anti-wear plug |
| WO2011000943A1 (en) * | 2009-07-02 | 2011-01-06 | Snecma | Propeller hub |
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