CN101224494A - Technique for rapidly repairing axial flow fans rotor blades - Google Patents
Technique for rapidly repairing axial flow fans rotor blades Download PDFInfo
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- CN101224494A CN101224494A CN 200810052211 CN200810052211A CN101224494A CN 101224494 A CN101224494 A CN 101224494A CN 200810052211 CN200810052211 CN 200810052211 CN 200810052211 A CN200810052211 A CN 200810052211A CN 101224494 A CN101224494 A CN 101224494A
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Abstract
The invention discloses a fast repair process used for the movable vane of an axial flow fan rotor, comprising the following process steps that 1) alloy elements of Ni, Mo and Nb are added into an original 2Cr13 steel by a laser melting casting technique; the movable vane of the axial flow fan rotor is repaired detailedly by that a CO2 1000W crossflow laser processing device is adopted and the simulation profile modelling melting casting fast process of the movable vane is achieved and controlled by a computer digital program; 2) a 3-D finite element method is adopted to achieve a stress analysis, a material strength calculation and a service life analysis to the movable vane; 3) the natural vibration frequency of the repaired movable vane is measured. The invention has the advantages and effective effects that the damaged movable vane of the axial flow fan rotor can be fast repaired in a short time. The service life of the repaired movable vane of the axial flow fan rotor reaches or exceeds the new vane level of the original factory, with the highest service life which exceeds that of the new vane of the original factory by more than 70%. Furthermore, the invention can save the expense used for replacing new vanes for the enterprises, and reduce output value loss.
Description
Technical field
The invention belongs to a kind of blower blade renovation technique, particularly relate to a kind of technique for rapidly repairing axial flow fans rotor blades of the moving vane on a kind of axial flow fans rotor that can repair damage at short notice fast.
Background technology
Axial flow blower is the widely used power air feed equipments of industries such as iron and steel, oil, chemical industry, also is the key-point management equipment of enterprise.In the axial flow blower long-time running, owing to exist various dust in the working environment, corrosive medium, for example the heavy particle metallic dust and the sand dust of iron and steel enterprise, the corrosion of gases such as chloride in the petroleum chemical enterprise, sulphur, moving vane on the axial flow fans rotor is washed away and is corroded, and is thinned into knife edge type in the air inlet lateral root portion of moving vane and the upper top of exhaust side, serious formation breach.When breach expands to a certain degree, the strength degree of moving vane can't be applied to the shearing force that surpasses on the blade more than 10 tons in the bear rotor high speed rotating process, blade is the three-dimensional flow pneumatic modelling, the stack of its vibration frequency, sudden blade fatigue fracture can take place, and the result causes the stopping production of scrapping of whole unit.Original solution has only and more renews rotor and moving vane, the rehabilitation cost costliness, and maintenance cycle reaches the several months long, influences enterprise's ordinary production.
Summary of the invention
The present invention provides a kind of technique for rapidly repairing axial flow fans rotor blades of the moving vane on a kind of axial flow fans rotor that can repair damage at short notice fast for solving the technical problem that exists in the known technology.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is: a kind of technique for rapidly repairing axial flow fans rotor blades includes following processing step:
1) adopting the laser casting technology to repair the moving vane of axial flow fans rotor, specifically is to adopt CO2 1000W crossing current laser processing device, by the computer digit programme-control moving vane is simulated the contour melting cast rapid processing; 2) adopt the three-dimensional finite element method, the moving vane of repairing is carried out stress analysis, the strength of materials is calculated and analyze service life; 3) measure the moving vane eigentone of repairing.
The moving vane of being repaired is the three-dimensional flow pneumatic modelling blade that the 2Cr13 steel is made, and employed melt material is in described founding rapid processing of the 1st step: add Ni, Mo, Nb alloying element in the former 2Cr13 steel of moving vane.
Described melt material is given by the blade surface form automatically by pneumatic autoloader.
The 1st step laser casting parameter of described founding rapid processing is: use the automatic analog scanning of continuous light, spot diameter Φ 5mm adopts the nitrogen protection molten bath, and the overlapping rate of multiple tracks founding is 40%.
The 2nd step, described employing three-dimensional finite element method was analyzed the moving vane of repairing, and included: set up computation model, selecting the fan rotor axle is the origin of coordinates, X-axis is a rotor axis, and downstream direction is for just, and the Z axle is a rotor radial, outwards for just, Y-axis is definite by Y=Z * X; Set up mesh of finite element, blade is divided into 770 nodes, 850 20 node 3D solid unit; Apply external applied load, consider the centrifugal force load effect, on model, apply the centrifugal load of several=3700r/min.
The moving vane eigentone that described mensuration of the 3rd step is repaired is to measure under blade installation fixing state, uses sensor, signal amplifier, and the FFT spectrum analyzer, the power hammer detects; Adopt the frequency thinning method, resolving accuracy 0.025, reading is got 0.1HZ, presses the blade rank and measures.
A kind of technique for rapidly repairing axial flow fans rotor blades of the present invention, the advantage and the good effect that have are: can repair the moving vane on the axial flow fans rotor of damage at short notice fast.The moving vane of the axial flow fans rotor of repairing all meets or exceeds the new blade level of former factory service life, surpasses the new blade of former factory the highest service life more than 70%.Can be enterprise and save the expense of changing new blade, reduce output value loss.
Description of drawings
Fig. 1 is the 5th a grade of rotor blade frequency diagram of the present invention.
The specific embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, exemplify following examples now, it is as follows to describe a kind of technique for rapidly repairing axial flow fans rotor blades of the present invention in detail:
A kind of technique for rapidly repairing axial flow fans rotor blades of the present invention includes following processing step:
The 1st step: adopt the laser casting technology to repair the moving vane of axial flow fans rotor, specifically be to adopt CO2 1000W crossing current laser processing device, by the CNC laser processing machine bed control that five tetrads are moving moving vane is simulated the contour melting cast rapid processing, the laser casting technology is the novel forming technique of a kind of not damaged, contactless, luminous effect.
The moving vane that the present invention repaired is that the 2Cr13 steel is made, and is three-dimensional flow pneumatic modelling blade.Moving vane under arms in, every blade bears shear stress more than 10 tons, has the superpositing vibration of vibration frequency in blade self eigentone and the rotation process, requires both antiscour wearing and tearing of blade material, anticorrosion stress-resistant again, blade must be laid in very high intensity index.
The present invention's employed melt material in the founding rapid processing is: add Ni, Mo, Nb alloying element in the former 2Cr13 steel of moving vane.Its melt material is to be given automatically by the blade surface form by pneumatic autoloader.
The laser casting parameter of described founding rapid processing is: use the automatic analog scanning of continuous light, spot diameter Φ 5mm adopts the nitrogen protection molten bath, and the overlapping rate of multiple tracks founding is 40%.
Second step: adopt the three-dimensional finite element method, the moving vane of repairing is carried out stress analysis, the strength of materials is calculated and analyze service life;
Described employing three-dimensional finite element method is analyzed the moving vane of repairing, and includes: set up computation model, selecting the fan rotor axle is the origin of coordinates, X-axis is a rotor axis, and downstream direction is for just, and the Z axle is a rotor radial, outwards for just, Y-axis is definite by Y=Z * X; Set up mesh of finite element, blade is divided into 770 nodes, 850 20 node 3D solid unit; Apply external applied load, consider the centrifugal force load effect, on model, apply the centrifugal load of n=3700r/min.
Result of calculation is as follows:
Table 1, Stress calculation result
| б(Mpa) | No.2 | The position |
| 163.0 | 3.13 | Leaf basin trailing edge is followed about 0.3mm place apart from leaf |
| 98.3 | 5.19 | Dorsal part, about 1/3 apart from trailing edge, apart from the about 1.66mm of blade root place |
Table 2, creep rupture life
| б(Mpa) | The position | Creep rupture life (H) |
| 65.8 | Leaf basin trailing edge is apart from the about 0.3mm of blade root place | ＞10 5 |
Think that axial flow fans rotor blades is behind the laser casting repair and reconstruction, blade has higher intensity and life-span deposit, can continue to use, and is higher than the new blade of former manufacturing its creep rupture life.
The 3rd step: measure the moving vane eigentone of repairing.
The moving vane eigentone that described mensuration is repaired is to measure under blade installation fixing state, and firmly hammer knocks blade, and by sensor the blade vibration signal is sent into and to be sent into the FFT spectrum analyzer again after amplifier amplifies, and detects; Adopt the frequency thinning method, resolving accuracy 0.025, reading is got 0.1HZ, presses the blade rank and measures.
Measurement result is:
With the 5th grade of axial flow fans rotor totally 20 moving vanes be example, the frequency dispersion degree is 2.1%.Detailed results sees Table 3 and Fig. 1.
Table 3, the 5th grade of rotor blade side frequency result
| Blade number | Frequency F1 (HZ) | Blade number | Frequency F1 (HZ) |
| 1 | 243.8 | 11 | 241.5 |
| 2 | 240.9 | 12 | 242.4 |
| 3 | 240.4 | 13 | 241.0 |
| 4 | 240.7 | 14 | 240.3 |
| 5 | 241.2 | 15 | 242.2 |
| 6 | 240.8 | 16 | 242.3 |
| 7 | 240.5 | 17 | 241.4 |
| 8 | 242.3 | 18 | 238.7 |
| 9 | 241.7 | 19 | 242.0 |
| 10 | 240.4 | 20 | 240.8 |
Find out that from the result because blade is assemblied on the fan rotor, tenon is fastening good, the blade frequencies measurement result is true and reliable.First order frequency of axial flow fans rotor blades disperses less, and 8.0% standard that is not more than far below domestic and international regulation satisfies instructions for use.
Axial flow fans rotor blades installation operation runtime verification through the present technique process is repaired all meets or exceeds the new blade level of former factory system service life, surpasses the new blade of former factory the highest service life more than 70%.In recent years, use the present technique process,, reduce the output value and lose about 2,600,000,000 yuan for enterprise saves about 200,000,000 yuan of the new blade expense of changing for enterprises such as iron and steel, oil, chemical industry reparation all size model axial flow blower reaches more than 60 (cover).
Example 1:
Certain iron and steel group company iron-smelter blast furnace air-supply AV45-11 profile shaft flow fan, rotating speed 6800r/min has 11 grades of rotor blades.Blade material is the 2Cr13 steel, finds that through operation in nearly 2 years rotor blade air inlet side heel all by erosion corrosion wearing and tearing in various degree, forms the about 17 * 30mm of maximum breach, and exhaust limit and top are washed away attenuate and become knife edge type.Adopt the reparation of the art of this patent process, moving vane is repaired through the laser casting flash mould, X-ray, fluorescence nondestructive flaw detection examination do not have repair-deficiency, carry out assessing intensity calculating and creep rupture life and reach application requirements, the average dispersion rate of 11 grade blade vibration frequencies reaches critical field 2.1～5.6%.Experiment reaches the G1.0 grade standard through adjustment of balance in the blade installation, goes into operation to start once success, and running status is steady, and performance is up to standard.Use three and half just to enter next maintenance interval, surpass more than 70% of former axial flow blower service life, for enterprise saves about 2,000,000 yuan of the new blade expense of changing, reduce downtime and reach 3 first quarter moons only 15 days maintenance time, reduce the output value and lose 1.05 hundred million yuan.
Claims (6)
1. a technique for rapidly repairing axial flow fans rotor blades is characterized in that, includes following processing step:
1) adopting the laser casting technology to repair the moving vane of axial flow fans rotor, specifically is to adopt CO2 1000W crossing current laser processing device, by the computer digit programme-control moving vane is simulated the contour melting cast rapid processing;
2) adopt the three-dimensional finite element method, the moving vane of repairing is carried out stress analysis, the strength of materials is calculated and analyze service life;
3) measure the moving vane eigentone of repairing.
2. a kind of technique for rapidly repairing axial flow fans rotor blades according to claim 1, it is characterized in that, the moving vane of being repaired is the three-dimensional flow pneumatic modelling blade that the 2Cr13 steel is made, and employed melt material is in described founding rapid processing of the 1st step: add Ni, Mo, Nb alloying element in the former 2Cr13 steel of moving vane.
3. a kind of technique for rapidly repairing axial flow fans rotor blades according to claim 2 is characterized in that described melt material is given by the blade surface form automatically by pneumatic autoloader.
4. a kind of technique for rapidly repairing axial flow fans rotor blades according to claim 1; it is characterized in that; the 1st step laser casting parameter of described founding rapid processing is: use the automatic analog scanning of continuous light; spot diameter Φ 5mm; adopt the nitrogen protection molten bath, the overlapping rate of multiple tracks founding is 40%.
5. a kind of technique for rapidly repairing axial flow fans rotor blades according to claim 1, it is characterized in that, the 2nd step, described employing three-dimensional finite element method was analyzed the moving vane of repairing, include: set up computation model, selecting the fan rotor axle is the origin of coordinates, and X-axis is a rotor axis, downstream direction is for just, the Z axle is a rotor radial, and outwards for just, Y-axis is definite by Y=Z * X; Set up mesh of finite element, blade is divided into 770 nodes, 850 20 node 3D solid unit; Apply external applied load, consider the centrifugal force load effect, on model, apply the centrifugal load of several=3700r/min.
6. a kind of technique for rapidly repairing axial flow fans rotor blades according to claim 1, it is characterized in that, the moving vane eigentone that described mensuration of the 3rd step is repaired, be under blade installation fixing state, to measure, use sensor, signal amplifier, the FFT spectrum analyzer, the power hammer detects; Adopt the frequency thinning method, resolving accuracy 0.025, reading is got 0.1HZ, presses the blade rank and measures.
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| CN 200810052211 CN101224494A (en) | 2008-01-30 | 2008-01-30 | Technique for rapidly repairing axial flow fans rotor blades |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104384719A (en) * | 2014-09-19 | 2015-03-04 | 江苏大学 | Device and method for removing damage region of fiber reinforced composite materials |
| CN114367783A (en) * | 2022-01-10 | 2022-04-19 | 广东韶钢松山股份有限公司 | Maintenance method for fan vibration |
-
2008
- 2008-01-30 CN CN 200810052211 patent/CN101224494A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104384719A (en) * | 2014-09-19 | 2015-03-04 | 江苏大学 | Device and method for removing damage region of fiber reinforced composite materials |
| CN104384719B (en) * | 2014-09-19 | 2016-04-27 | 江苏大学 | A kind of apparatus and method removing fibre reinforced composites damaged zone |
| CN114367783A (en) * | 2022-01-10 | 2022-04-19 | 广东韶钢松山股份有限公司 | Maintenance method for fan vibration |
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