CN107671152A - A kind of uiform section hollow fan blade low-angle based on stress relaxation reverses method - Google Patents
A kind of uiform section hollow fan blade low-angle based on stress relaxation reverses method Download PDFInfo
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- CN107671152A CN107671152A CN201710852930.3A CN201710852930A CN107671152A CN 107671152 A CN107671152 A CN 107671152A CN 201710852930 A CN201710852930 A CN 201710852930A CN 107671152 A CN107671152 A CN 107671152A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000007493 shaping process Methods 0.000 claims abstract description 24
- 238000013461 design Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000004458 analytical method Methods 0.000 claims description 9
- 238000000605 extraction Methods 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 238000010998 test method Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
- B21D11/10—Bending specially adapted to produce specific articles, e.g. leaf springs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/78—Making other particular articles propeller blades; turbine blades
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a kind of uiform section hollow fan blade low-angle based on stress relaxation to reverse method, including：Stress relaxation curve of the blade material under the conditions of different temperatures and different initial strains is obtained using high-temperature stress relaxation test method, and forming temperature and stress relaxation time are determined according to deflection after blade twist；According to blade profile shape and blade twist angle design clamping torsion device；At room temperature, by the clamping torsion device coordinated with hollow blade both ends, by blade twist to final shape angles；Clamping blade and clamping torsion device are transferred along in heater, waits blade to be heated to the stress relaxation temperature of design and keeps to design slack time；Stop heating, take out blade after cooling, remove clamping torsion device.This invention simplifies the device and technical process that current high temperature reverses shaping, torsion shaping is carried out to hollow fan blade using high-temperature stress relaxation method.
Description
Technical field
The invention belongs to hollow fan blade torsion technique field, refers specifically to empty for a kind of uiform section based on stress relaxation
Heart fan blade low-angle reverses method.
Background technology
Hollow blade can mitigate blade own wt, improve operating efficiency.Blade is linear simultaneously to be flowed according to gas
It is required that it is designed, often with certain torsional bending angle.
At present, it is to clamp blade, blade tenon by twisting fixture that common equal thickness solid vane, which reverses forming technology,
It is fixed, rotated by chuck and realize blade torsional deflection.High temperature torsional bending for titanium alloy Varying-thickness hollow blade shapes,
Chinese invention patent application number is to propose a kind of hollow blade in CN201310508213.0 and CN201320660835.0 to push away
O ing technique and a kind of hollow blade push away o ing mould, design according to finished product hollow blade appearance curved surface and are opened with both sides
Blade is pushed into mold cavity by the mould of mouth mold chamber passage, clamping blade tenon from die cavity passage end, and blade is in mold cavity
It is forced to bend in the presence of inner surface, twist deformation.Chinese invention patent application number be CN201510122613.7 and
Be directed in patent application disclosed in CN201520157870.X in push-bending process can only accurately control the displacement of blade tenon without
The shortcomings that blade position distortions can be controlled, it is proposed that a kind of hollow blade multi-section reverses shaping method and apparatus, realizes pair
The accurate control of blade blade different cross section torsional deflection.Above-mentioned blade twist manufacturing process be applied to big torsion angle blade into
Shape, and be all clamping parts, and blade is heated to forming temperature using heater at normal temperatures, driven by transmission device
Twisting fixture completes blade twist.Twist process need to be carried out at high temperature, and torsion device is complicated and design and manufacturing cost are higher,
The motion of twisting fixture needs accurate control.
For prismatic small torsion angle hollow fan blade, reverse manufacturing process according to high temperature above and filled for reversing
Put clamping and kinematic accuracy requires high, forming process cost will greatly promote.According to cold forming method under normal temperature, due to deformation
Amount is smaller, and springback influence is big, and windup-degree is difficult to accurately control, and reverses forming difficulty.
Stress relaxation manufacturing process is part deformation is reached design requirement and is consolidated part by fixture clamping under normal temperature
It is fixed, part and fixture are together then heated to stress relaxation temperature, using material under Elevated Temperature Conditions internal stress with the time
Increase and reduce, while elastic deformation realizes part Plastic Forming for the characteristic of plastic deformation.
The content of the invention
Above-mentioned the deficiencies in the prior art are directed to, it is an object of the invention to provide a kind of uiform section based on stress relaxation
Hollow fan blade low-angle reverses method, to solve the springback influence, torsion that manufacturing process is brought under normal temperature in the prior art
The problem of angle is difficult to accurately control.This invention simplifies the device and technical process that current high temperature reverses shaping, using high temperature
Stress relaxation method carries out torsion shaping to hollow fan blade.
To reach above-mentioned purpose, the technical solution adopted by the present invention is as follows：
A kind of uiform section hollow fan blade low-angle based on stress relaxation of the present invention reverses method, including as follows：
1）Build the blank model and finished product model of uiform section hollow fan blade；
2）Blade head end cross section curve before and after blade twist shapes is extracted, calculates blade twist angle；
3）It is distributed using analysis of finite element method deformable blade, obtains Strain Distribution after blade normal temperature reverses；
4）The stress relaxation curve under different temperatures is obtained, and according to Strain Distribution design stress relaxation temperature after blade twist deformation
Degree and stress relaxation time；
5）According to blade twist shaping front and rear blank model and finished product model, design blade two ends clamping torsion device；
6）Blade two ends are positioned in clamping torsion device, at normal temperatures extremely counted blade twist by clamping torsion device
Obtained blade twist angle；
7）The blade assembled and clamping torsion device are together moved into heater, are heated to the stress relaxation temperature of design
Degree, and be incubated to required stress relaxation time, take out blade after cooling.
Preferably, the step 2）Specifically include：By uiform section hollow fan blade reverse shaping before blank model and
Reverse the finished product model after shaping to import in same model, the tail end of blade blank model and finished product model is overlapped；Pass through leaf
Piece blank head end makees a plane, and the head end cross section curve of blade blank model and finished product model before and after shaping is reversed in extraction；Turning round
Change on shape front vane blank model head end cross section curve and extract 2 points of one straight lines of work, shaping rear blade finished product model is first reversing
2 points of one straight lines of work corresponding to being determined on end section line, two straight-line intersection o are the centre of twist, and two included angle of straight line α are to reverse
Angle.
Preferably, the step 3）Specifically include：It is distributed using analysis of finite element method deformable blade, determines maximum distortion
Position strains；According to blade blank model and blade twist center and windup-degree, with reference to blade material model at room temperature, establish
Blade twist shapes FEM model, obtains Strain Distribution after blade normal temperature reverses.
Preferably, the step 4）Specifically include：According to blade twist finite element analysis Strain Distribution result, blade is determined
Twist process maximum strain；At different temperatures and initial deformation is progress stress relaxation reality under the conditions of blade twist maximum strain
Test, pass through experimental result identified sign relaxation temperature and stress relaxation time.
Preferably, described clamping torsion device includes：Blade two ends clamping plate fixed plate, blade head end clamping plate,
Nut, screw rod, blade tail end clamping plate, blade tail end clamping plate support base, blade clamping plate fixed plate support base, its
In, blade head end clamping plate, blade tail end clamping plate are connected with blade two ends clamping plate fixed plate respectively by screw rod and nut
Connect, blade two ends clamping plate fixed plate is bolted respectively with blade tail end clamping plate is fixed on blade dress Boards wall
In plate support base and blade tail end clamping plate support base.
Beneficial effects of the present invention：
The present invention can not only accurately control the windup-degree of blade, simultaneously it is possible to prevente effectively from resilience caused by room temperature shaping
Clamping device can be simplified, avoid the motion of high temperature lower clamp and associated actuator mechanism, and stress relaxation temperature and hot forming temperature
Degree is compared to relatively low.Technical process is easy, easy to control, and formed product is stable, efficiency high.
Brief description of the drawings
Fig. 1 is the flow chart of the inventive method.
Fig. 2 is the schematic diagram of clamping torsion device.
Fig. 3 a are the schematic diagram of blade twist center and windup-degree.
Fig. 3 b are Fig. 3 a partial enlarged drawing.
Fig. 4 is the schematic diagram of blade two ends clamping plate.
Embodiment
For the ease of the understanding of those skilled in the art, the present invention is made further with reference to embodiment and accompanying drawing
Bright, the content that embodiment refers to not is limitation of the invention.
Shown in reference picture 1, a kind of uiform section hollow fan blade low-angle torsion side based on stress relaxation of the invention
Method, including it is as follows：
1）Build the blank model and finished product model of uiform section hollow fan blade, the i.e. front and rear model of blade shaping；Referring to figure
3a, wherein, 15 is reverse shaping front vane, and 16 be torsion shaping rear blade.
2）Blade head end cross section curve before and after blade twist shapes is extracted, calculates blade twist angle；Uiform section is hollow
Fan blade reverses the front and rear blank model of shaping and finished product model is imported in same model, and blade tail end is overlapped；Pass through leaf
Piece head end makees a plane, and blade head end cross section curve before and after shaping is reversed in extraction；Front vane head end cross section curve is shaped reversing
Upper 2 points of one straight lines of work of extraction, 2 points of one straight lines of work, two straight lines corresponding to determination on shaping rear blade head end section line is reversed
Intersection point o is the centre of twist, and two included angle of straight line α are windup-degree, and referring to shown in Fig. 3 b, 17 shape front vane head end to reverse
Cross section curve, 18 shape rear blade head end cross section curve to reverse.
3）It is distributed using analysis of finite element method deformable blade, obtains Strain Distribution after blade normal temperature reverses；Using limited
First method analysis deformable blade distribution, determines that maximum distortion position strains；According to blade blank model and blade twist center with
Windup-degree, with reference to blade material model, blade twist shaping FEM model is established, obtains after blade normal temperature reverses and answers variation
Cloth.
4）The stress relaxation curve under different temperatures is obtained, and according to blade twist deformation design stress relaxation temperature and is answered
Power slack time；According to blade twist finite element analysis Strain Distribution result, blade twist process maximum strain is determined；In difference
At a temperature of and initial deformation be blade twist maximum strain under the conditions of carry out stress relaxation experiment, pass through experimental result identified sign
Relaxation temperature and stress relaxation time.
5）Finished product modelling blade both ends clamping plate after being shaped according to blade twist, as shown in figure 4, passing through leaf respectively
Piece finished product model both ends interception blade profile face, design blade two ends clamping plate, wherein, 2 be blade head end clamping plate, and 7 are
Uiform section hollow fan blade finished product, 8 be blade tail end clamping plate.
6）Blade two ends are positioned in clamping torsion device, the two respectively by screw rod 4,6,10,12 and nut 3,
5th, 9,13 it is fixed in blade two ends clamping plate fixed plate 1, at normal temperatures by clamping torsion device by blade twist
To design angle；Blade two ends clamping plate fixed plate 1 is bolted and is fixed on blade respectively with blade tail end clamping plate 8
In two ends clamping plate fixed plate support base 14 and blade tail end clamping plate support base 11.Shown in reference picture 2.
7）The blade assembled and clamping torsion device are together moved into heater, are heated to the stress relaxation of design
Temperature（The stress relaxation temperature determined by Strain Distribution after stress relaxation test and deformable blade）, and be incubated to required stress
Slack time, stop heating, after blade and its cooling of clamping torsion device, it is taken out from heater, blade twist
Shaping is completed.
Wherein, described heater can be resistance-type heating furnace, shaft furnace, vacuum furnace etc., meet heating-up temperature
And heating space.
Concrete application approach of the present invention is a lot, and described above is only the preferred embodiment of the present invention, it is noted that for
For those skilled in the art, under the premise without departing from the principles of the invention, some improvement can also be made, this
A little improve also should be regarded as protection scope of the present invention.
Claims (5)
1. a kind of uiform section hollow fan blade low-angle based on stress relaxation reverses method, it is characterised in that including as follows：
1）Build the blank model and finished product model of uiform section hollow fan blade；
2）Blade head end cross section curve before and after blade twist shapes is extracted, calculates blade twist angle；
3）It is distributed using analysis of finite element method deformable blade, obtains Strain Distribution after blade normal temperature reverses；
4）The stress relaxation curve under different temperatures is obtained, and according to Strain Distribution design stress relaxation temperature after blade twist deformation
Degree and stress relaxation time；
5）According to blade twist shaping front and rear blank model and finished product model, design blade two ends clamping torsion device；
6）Blade two ends are positioned in clamping torsion device, at normal temperatures extremely counted blade twist by clamping torsion device
Obtained blade twist angle；
7）The blade assembled and clamping torsion device are together moved into heater, are heated to the stress relaxation temperature of design
Degree, and be incubated to required stress relaxation time, take out blade after cooling.
2. the uiform section hollow fan blade low-angle according to claim 1 based on stress relaxation reverses method, it is special
Sign is, the step 2）Specifically include：Uiform section hollow fan blade is reversed into the blank model before shaping and reverses shaping
Finished product model afterwards is imported in same model, and the tail end of blade blank model and finished product model is overlapped；It is first by blade blank
A plane is made at end, and the head end cross section curve of blade blank model and finished product model before and after shaping is reversed in extraction；Before shaping is reversed
2 points of one straight lines of work are extracted on blade blank model head end cross section curve, shape rear blade finished product model head end section line reversing
2 points of one straight lines of work corresponding to upper determination, two straight-line intersection o are the centre of twist, and two included angle of straight line α are windup-degree.
3. the uiform section hollow fan blade low-angle according to claim 2 based on stress relaxation reverses method, it is special
Sign is, the step 3）Specifically include：It is distributed using analysis of finite element method deformable blade, determines that maximum distortion position should
Become；According to blade blank model and blade twist center and windup-degree, with reference to blade material model at room temperature, blade torsion is established
Shape FEM model is changed into, obtains Strain Distribution after blade normal temperature reverses.
4. the uiform section hollow fan blade low-angle according to claim 3 based on stress relaxation reverses method, it is special
Sign is, the step 4）Specifically include：According to blade twist finite element analysis Strain Distribution result, blade twist process is determined
Maximum strain；At different temperatures and initial deformation is progress stress relaxation experiment under the conditions of blade twist maximum strain, is passed through
Experimental result identified sign relaxation temperature and stress relaxation time.
5. the uiform section hollow fan blade low-angle according to claim 1 based on stress relaxation reverses method, it is special
Sign is that described clamping torsion device includes：Blade two ends clamping plate fixed plate, blade head end clamping plate, nut, spiral shell
Bar, blade tail end clamping plate, blade tail end clamping plate support base, blade clamping plate fixed plate support base, wherein, blade is first
End clamping plate, blade tail end clamping plate are connected with blade two ends clamping plate fixed plate respectively by screw rod and nut, and blade is first
Tail end clamping plate fixed plate is bolted respectively with blade tail end clamping plate is fixed on blade clamping plate fixed plate support bottom
On seat and blade tail end clamping plate support base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710852930.3A CN107671152B (en) | 2017-09-20 | 2017-09-20 | A kind of cross-section hollow fan blade low-angle torsion method based on stress relaxation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710852930.3A CN107671152B (en) | 2017-09-20 | 2017-09-20 | A kind of cross-section hollow fan blade low-angle torsion method based on stress relaxation |
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| Publication Number | Publication Date |
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| CN107671152A true CN107671152A (en) | 2018-02-09 |
| CN107671152B CN107671152B (en) | 2019-01-11 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3680060A1 (en) * | 2019-01-11 | 2020-07-15 | United Technologies Corporation | Method of forming gas turbine engine components |
| CN112808814A (en) * | 2020-12-31 | 2021-05-18 | 南京航空航天大学 | Auxiliary electric heating torsion forming device and method for shroud plate of blade |
| CN112845746A (en) * | 2020-12-31 | 2021-05-28 | 南京航空航天大学 | High-temperature progressive torsion forming device and method for fan blades |
| CN113182405A (en) * | 2021-04-30 | 2021-07-30 | 北京航空航天大学 | Thermal torsion forming method of titanium alloy hollow blade and torsion assembly thereof |
| CN114417642A (en) * | 2022-03-29 | 2022-04-29 | 中国工程物理研究院流体物理研究所 | Large-scale structure surface deformation prediction method |
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| DE2826989A1 (en) * | 1978-05-26 | 1979-11-29 | Bbc Brown Boveri & Cie | Continuously twisted metal strip for flow machine blade - uses die aligned at right angles to axes of pairs of rollers |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3680060A1 (en) * | 2019-01-11 | 2020-07-15 | United Technologies Corporation | Method of forming gas turbine engine components |
| CN112808814A (en) * | 2020-12-31 | 2021-05-18 | 南京航空航天大学 | Auxiliary electric heating torsion forming device and method for shroud plate of blade |
| CN112845746A (en) * | 2020-12-31 | 2021-05-28 | 南京航空航天大学 | High-temperature progressive torsion forming device and method for fan blades |
| CN113182405A (en) * | 2021-04-30 | 2021-07-30 | 北京航空航天大学 | Thermal torsion forming method of titanium alloy hollow blade and torsion assembly thereof |
| CN114417642A (en) * | 2022-03-29 | 2022-04-29 | 中国工程物理研究院流体物理研究所 | Large-scale structure surface deformation prediction method |
| CN114417642B (en) * | 2022-03-29 | 2022-06-10 | 中国工程物理研究院流体物理研究所 | Large-scale structure surface deformation prediction method |
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