CN105252201B - A kind of unqualified rescue method of dynamic balancing of essence casting integral power turbine wheel - Google Patents
A kind of unqualified rescue method of dynamic balancing of essence casting integral power turbine wheel Download PDFInfo
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- CN105252201B CN105252201B CN201510673535.XA CN201510673535A CN105252201B CN 105252201 B CN105252201 B CN 105252201B CN 201510673535 A CN201510673535 A CN 201510673535A CN 105252201 B CN105252201 B CN 105252201B
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- 230000007704 transition Effects 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 18
- 210000001114 tooth apex Anatomy 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 9
- 238000012937 correction Methods 0.000 description 15
- 238000005495 investment casting Methods 0.000 description 5
- 238000003754 machining Methods 0.000 description 4
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/02—Blade-carrying members, e.g. rotors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
A kind of unqualified rescue method of dynamic balancing of essence casting integral power turbine wheel, it comprises the following steps, step A, carries out single part dynamic balancing detection, calculates in former both sides offset；Step B, the second center hole to the wheel shaft of the second periphery side on lathe is modified；Step C, the first center hole to the wheel shaft of the first periphery side is modified；Step D, eccentric mill is carried out to power turbine impeller；Step E, the power turbine impeller after being processed to step D carries out single part dynamic balancing；Step F, after the dynamically balanced power turbine impeller of single part being completed in step E and is combined into the power turbine combination, carries out component dynamic, completes the unqualified redemption of dynamic balancing to the power turbine impeller.A kind of unqualified rescue method of dynamic balancing of essence casting integral power turbine wheel provided by the present invention, is rectified a deviation by eccentric turner sequence, substantially improves blank deviation to dynamically balanced influence.
Description
Technical Field
The invention relates to the field of machinery, in particular to a dynamic balance disqualification rescue method for a precision-cast integral power turbine impeller.
Background
Fig. 1 is a schematic sectional structure view of a power turbine impeller, fig. 2 is a schematic sectional structure view of a power turbine rotor assembly formed by combining the power turbine impeller shown in fig. 1, and referring to fig. 1 and 2, the power turbine impeller 1 includes blades 11, a web 12 and a wheel shaft 13 which are connected in sequence, convex correction rings 121 are arranged on two sides of the web 12, the power turbine impeller 1 belongs to a typical integral precision casting, and the integral impeller formed by precision casting has the characteristics of high processing efficiency, low cost, good integral performance, high material utilization rate and the like, so that the power turbine impeller is widely used for producing parts of the rotor assembly of power equipment such as an aeroengine and the like. Since the power turbine rotor assembly 2 operates under high-speed rotation conditions, a dynamic balance correction is required to eliminate the unbalance amount of the power turbine rotor assembly 2, so as to ensure safe operation.
For a single power turbine impeller 1 part, the purpose of dynamic balance is only to ensure smooth over-rotation, and the problem that over-rotation test cannot be performed due to vibration caused by centrifugal inertia generated by unbalance of the power turbine impeller 1 is avoided. The dynamic balancing of the individual power turbine wheels 1 is therefore actually for the purpose of balancing the power turbine wheel 1 and the combination of the over-rotation clamp, the individual parts for the power turbine wheel 1 themselves not being relieved of their own unbalance.
Because the blank of the power turbine impeller 1 which is integrally and finely cast is an integral casting, the blank is unevenly distributed in the integral casting process, that is, the blank of the power turbine impeller 1, which is integrally precision cast, may have some deviation in thickness and positional deviation of the respective blades, and further, because the machining reference is converted back and forth for many times in the machining process, the accumulated error is increased, the centers of two side surfaces of the power turbine impeller 1 of the precision casting whole are not coincident (namely, an included angle exists between the actual central axis of the power turbine impeller 1 and the theoretical axis thereof), therefore, eccentric moment can be generated in the dynamic balancing process of a single part, so that the initial unbalance amount of the single part is larger, the calibration rings 121 balance the parts by stripping, and it is difficult to reach the final requirement when the parts are stripped. It is necessary to readjust the initial unbalance amount of the part by relief machining.
Furthermore, the assembly dynamic balancing is the self-balancing of the assembly, where the two correction rings 121 of the individual parts of the power turbine wheel 1 balance the power turbine rotor assembly 2 by stripping. When the power turbine impeller 1 has a large amount of material removed in the dynamic balancing process of a single part, the material removal of the single part of the power turbine impeller 1 required for the dynamic balancing of the components of the power turbine rotor assembly 2 is also increased correspondingly, so that the dynamic balancing of the components of the power turbine rotor assembly 2 is easily impossible due to the insufficient material removal amount of the correction ring 121.
The existing mechanical processing method cannot completely eliminate the influence of blank states on the dynamic balance of single parts, and the single parts of the power turbine impeller 1 with large initial motionless balance amount are difficult to reach final balance by a method of removing the material of the correction ring 121 after being combined into the power turbine rotor combination 2, so that the one-time intersection and inspection yield is low.
Disclosure of Invention
The invention aims to provide a method for remedying unqualified dynamic balance of a precision-cast integral power turbine impeller, so as to reduce or avoid the problems.
In order to solve the technical problem, the invention provides a dynamic balance disqualification remedying method of a precision casting integral power turbine impeller, which is used for remedying the power turbine impeller with disqualified dynamic balance and comprises the following steps,
step A, carrying out dynamic balance detection on a single part of the power turbine impeller with unqualified dynamic balance, then respectively marking key and light point parts and specific unbalance amounts of the part measured in the dynamic balance process on two sides of a web, and calculating the eccentric amount of the single part of the power turbine impeller on the two sides of the web through the following formula;
eccentricity is the unbalance amount of the part multiplied by the unbalance radius/part mass;
step B, clamping and fixing a single part of the power turbine impeller by taking a first outer circular surface of the wheel shaft on one side of the web plate as a positioning surface and taking a first edge plane of the web plate on the same side as a supporting surface on a lathe, aligning a second outer circular surface of the wheel shaft on the other side of the web plate and a second edge plane of the web plate, and carrying out eccentricity on the power turbine impeller according to the key points, light point positions and eccentricity marked on the web plate on one side of the second outer circular surface which is not clamped and fixed and obtained in the step A, so that a second tip hole of the wheel shaft on one side of the second outer circular surface can be corrected;
step C, the second outer circular surface is used as a positioning surface, the second edge plane on the same side is used as a support surface to clamp and fix a single part of the power turbine impeller, the first outer circular surface and the first edge plane are aligned, the power turbine impeller is eccentric according to the key points, light points and eccentric amounts marked on the web plate on one side of the first outer circular surface which is not clamped and fixed and obtained in the step A, and then the first tip hole of the wheel shaft on one side of the first outer circular surface can be corrected;
d, grinding the second apical foramen and the first apical foramen corrected in the steps B and C to ensure that the second apical foramen and the first apical foramen are coaxial, and then using two apexes to prop against the second apical foramen and the first apical foramen to perform eccentric grinding on the power turbine impeller so as to remove the eccentric amount on the blade tip parts of the blades and the first outer circular surface and the second outer circular surface of the wheel shaft;
e, carrying out dynamic balance on the single part of the power turbine impeller processed in the step D;
and F, combining the power turbine impeller which completes the dynamic balance of the single part in the step E into the power turbine rotor combination, and then performing component dynamic balance to complete the unqualified rescue of the dynamic balance of the power turbine impeller.
Preferably, in step F, material is removed at a first transition fillet between the first side plane and the correction ring and at a second transition fillet between the second side plane and the correction ring in the direction of the important part of the power turbine rotor assembly, so that the assembly is dynamically balanced.
According to the method for rescuing the unqualified dynamic balance of the precision-cast integral power turbine impeller, the influence of blank deviation on the dynamic balance is greatly improved through the deviation rectification of the eccentric lathe, so that the final product can meet the design requirement.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein,
FIG. 1 is a schematic cross-sectional view of a power turbine wheel assembly;
FIG. 2 is a cross-sectional structural schematic view of a power turbine rotor assembly formed by the combination of power turbine wheel components shown in FIG. 1.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings. Wherein like parts are given like reference numerals.
Fig. 1 is a schematic sectional structure view of a power turbine impeller part, fig. 2 is a schematic sectional structure view of a power turbine rotor assembly formed by combining the power turbine impeller parts shown in fig. 1, and referring to fig. 1-2, for the case that centers of two side surfaces of the power turbine impeller 1 mentioned in the background art are not overlapped and the case that the dynamic balance of components of the power turbine rotor assembly 2 cannot be performed due to insufficient material removal amount of the correction ring 121, in order to enable the power turbine impeller 1 in the two cases to be repaired to be qualified, the invention provides a method for rescuing the unqualified dynamic balance of a precision cast integral power turbine impeller, which is used for rescuing the power turbine impeller 1 with unqualified dynamic balance, and comprises the following steps,
step A, carrying out dynamic balance detection on a single part of the power turbine impeller 1 with unqualified dynamic balance, then marking key and light point parts and specific unbalance amounts of the part measured in the dynamic balance process on two sides of a web 12 respectively, and calculating the eccentric amount of the single part of the power turbine impeller 1 on two sides of the web 12 through the following formula;
eccentricity is the unbalance x unbalance radius/mass of the part
For example, the mass of the component of the power turbine impeller 1 is 970g, the radius of the correction ring 121 (i.e., the unbalance radius in the above formula) is 62mm, and the initial unbalance amount on the outer circumferential surface 132 side of the hub 13 is 3.5g, so that the eccentricity amount of the single component of the power turbine impeller 1 on the outer circumferential surface 132 side of the hub 13 is 3.5 × 62/970 — 0.115mm, that is, the eccentricity amount of the single component of the power turbine impeller 1 is 0.115 × 2 — 0.23 mm.
In order to avoid the influence of the overlarge eccentricity on the length of the blade 11, the eccentricity needs to be controlled within 0.2mm
Step B, clamping and fixing the single part of the power turbine impeller 1 by using the first outer circular surface 131 of the axle 13 on one side of the web 12 as a positioning surface and the first edge plane 122 of the web 12 on the same side as a supporting surface on a lathe, aligning the second outer circular surface 132 of the axle 13 on the other side of the web 12 and the second edge plane 123 of the web 12, ensuring that the runout of the second outer circular surface 132 and the second edge plane 123 is not more than 0.01mm in the alignment process, and decentering the power turbine impeller 1 according to the key points, the light points and the eccentricity marked on the web 12 on one side of the second outer circular surface 132 which is not clamped and fixed, which are obtained in the step a, that is, adjusting the center of one side of the second outer circular surface 132 to the key point direction, and moving the fixture and the power turbine impeller 1 integrally to the light point direction of one side of the second outer circular surface 132 on the lathe for adjusting the center of one side of the second outer circular surface 132 The dimension of the movement is consistent with the eccentric amount, the movement can be detected by recording on the second outer circular surface 132 in the direction of the light point, if the recording runout is twice the eccentric amount (i.e. the eccentric runout calculated in step a), the movement position is correct, and then the second apex hole 1302 of the wheel shaft 13 on one side of the second outer circular surface 132 can be corrected.
Step C, using the second outer circular surface 132 as a positioning surface, using the second edge plane 123 on the same side as a supporting surface to clamp and fix a single part of the power turbine impeller 1, aligning the first outer circular surface 131 and the first edge plane 122, and ensuring that the runout of the first outer circular surface 131 and the first edge plane 122 is not more than 0.01mm during the alignment process, wherein the power turbine impeller 1 is eccentric according to the key and light point positions and the eccentric amount marked on the web 12 on the side of the first outer circular surface 131, which is obtained in step a and is not clamped and fixed, that is, the center on the side of the first outer circular surface 131 is adjusted toward the key direction, and in order to adjust the center on the side of the first outer circular surface 131, the fixture and the power turbine impeller 1 are moved on a lathe toward the light point direction on the side of the first outer circular surface 131 by a size consistent with the eccentric amount, after the movement, the user can check the first outer circular surface 131 in the direction of the light point by typing a meter, and if the typing runout is twice the eccentricity (i.e., the eccentricity runout calculated in step a), the movement position is correct, and then the first apex hole 1301 of the axle 13 on the side of the first outer circular surface 131 can be corrected.
And D, grinding the second apical foramen 1302 and the first apical foramen 1301 corrected in the steps B and C to ensure that the second apical foramen 1302 and the first apical foramen 1301 are coaxial, and then using two apexes to prop against the second apical foramen 1302 and the first apical foramen 1301 to perform eccentric grinding on the power turbine impeller 1, so as to remove the eccentric amount on the blade tip parts of the blades 11 and the first outer circular surface 131 and the second outer circular surface 132 of the hub 13.
And E, carrying out dynamic balance on the single part of the power turbine impeller 1 processed in the step D. When the power turbine impeller 1 is combined with the dynamic balance clamp, the original assembly holes (such as the pin holes for riveting the power turbine impeller 1 and the dynamic balance clamp) can be avoided, and the assembly holes are reworked, so that the power turbine impeller 1 and the dynamic balance clamp can be combined on the basis of a new central shaft. Since the central shaft of the power turbine impeller 1 is adjusted, the material removal of the correction ring 121 is enough to ensure that the power turbine impeller 1 completes the dynamic balance of a single part in the dynamic balance detection process of the single part.
And F, after the power turbine impeller 1 subjected to the dynamic balance of the single part in the step E is combined into the power turbine rotor combination 2, carrying out component dynamic balance, and completing the unqualified rescue of the dynamic balance of the power turbine impeller 1.
After the steps a to E are completed, in the dynamic balancing process of the components after the power turbine impeller 1 is combined into the power turbine rotor combination 2, the heavy and light points of the power turbine rotor combination 2 are usually different from those before the disqualification rescue is not performed, which means that the calibration ring 121 in the new heavy point direction can provide enough material removal amount to complete the dynamic balancing of the components.
If the heavy and light points of the power turbine rotor assembly 2 are close to those before the disqualification repair is made during the dynamic balancing of the assembly, that is, the correction ring 121 cannot provide enough material removal to complete the dynamic balancing of the assembly, the material removal can be performed by eccentric turning on the first transition fillet 124 between the first edge plane 122 and the correction ring 121 and the second transition fillet 125 between the second edge plane 123 and the correction ring 121 in the direction of the heavy points of the power turbine rotor assembly 2, and when the material removal is performed on the first transition fillet 124 and the second transition fillet 125, the material removal can be performed on the side wall where the first edge plane 122 is connected with the first transition fillet 124 and the side wall where the second edge plane 123 is connected with the second transition fillet 125 at the same time, so that a larger material removal amount can be provided, thereby, the dynamic balance of the assembly can be ensured. Due to the wall thickness of the first and second edge planes 122, 123, and the design tolerances of the first and second transition fillets 124, 125, therefore, as long as the size after material removal is within the tolerance range, for example, when eccentric turning removal is carried out, the eccentricity amount can be less than or equal to half of the remaining tolerance of the part to be removed, this ensures that the power turbine wheel 1 is still a good product after the eccentric turning has been removed, and, in addition, since the first transition fillets 124 and the second transition fillets 125 are farther from the central axis of the power turbine wheel 1 than the correction ring 121, i.e. the first transition fillets 124 and the second transition fillets 125 have a larger moment arm than the correction ring 121, a larger amount of unbalance may be adjusted by removing a small amount of material at the location of the first transition rounding 124 and the second transition rounding 125.
During the machining of the blank of the power turbine impeller 1, the wall thickness dimensions of the first edge plane 122 and the second edge plane 123 and the circular arc dimensions of the first transition fillet 124 and the second transition fillet 125 can be machined to tolerance limits, that is, as much body material as possible is reserved in the above-mentioned areas, so that a large stock removal allowance can be reserved for the later dynamic balance adjustment.
According to the method for rescuing the unqualified dynamic balance of the precision-cast integral power turbine impeller, the influence of blank deviation on the dynamic balance is greatly improved through the deviation rectification of the eccentric lathe, so that the final product can meet the design requirement.
It should be appreciated by those of skill in the art that while the present invention has been described in terms of several embodiments, not every embodiment includes only a single embodiment. The description is given for clearness of understanding only, and it is to be understood that all matters in the embodiments are to be interpreted as including technical equivalents which are related to the embodiments and which are combined with each other to illustrate the scope of the present invention.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations can be made by those skilled in the art without departing from the spirit and principles of the invention.
Claims (2)
1. A method for remedying the unqualified dynamic balance of the precision-cast integral power turbine impeller, which is used for remedying the power turbine impeller with unqualified dynamic balance, comprises the following steps,
step A, carrying out dynamic balance detection on a single power turbine impeller part on the power turbine impeller with unqualified dynamic balance, then respectively marking key and light point parts and specific unbalance amounts of the part measured in the dynamic balance process on two sides of a web, and calculating the eccentricity of the single part of the power turbine impeller on the two sides of the web through the following formula;
eccentricity is the unbalance amount of the part multiplied by the unbalance radius/part mass;
b, clamping and fixing a single part of the power turbine impeller by taking a first outer circular surface of a wheel shaft on one side of the web plate as a positioning surface and taking a first edge plane of the web plate on the same side as a supporting surface on a lathe, aligning a second outer circular surface of the wheel shaft on the other side of the web plate and a second edge plane of the web plate, and carrying out eccentricity on the power turbine impeller according to the key points, light point positions and eccentricity marked on the web plate on one side of the second outer circular surface which is not clamped and fixed and obtained in the step A, so that a second tip hole of the wheel shaft on one side of the second outer circular surface can be corrected;
step C, the second outer circular surface is used as a positioning surface, the second edge plane on the same side is used as a support surface to clamp and fix a single part of the power turbine impeller, the first outer circular surface and the first edge plane are aligned, the power turbine impeller is eccentric according to the key points, light points and eccentric amounts marked on the web plate on one side of the first outer circular surface which is not clamped and fixed and obtained in the step A, and then the first apex hole of the wheel shaft on one side of the first outer circular surface can be corrected;
d, grinding the second apical foramen and the first apical foramen corrected in the steps B and C to ensure that the second apical foramen and the first apical foramen are coaxial, and then using two apexes to prop against the second apical foramen and the first apical foramen to perform eccentric grinding on the power turbine impeller so as to remove the eccentric quantities on the blade tips of the blades and the first outer circular surface and the second outer circular surface of the wheel shaft;
e, carrying out dynamic balance on the single part of the power turbine impeller processed in the step D;
and F, combining the power turbine impeller which completes the dynamic balance of the single part in the step E into a power turbine rotor combination, and then performing component dynamic balance to complete the unqualified rescue of the dynamic balance of the power turbine impeller.
2. The method of claim 1, wherein in step F, material is removed at a first transition fillet between the first side plane and the calibration ring and at a second transition fillet between the second side plane and the calibration ring in the direction of the point of interest of the power turbine rotor assembly to dynamically balance the assembly.
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| GB9106368D0 (en) * | 1991-03-26 | 1991-05-15 | Biwater Pumps Limited | Single vane impeller |
| JP3059401B2 (en) * | 1997-02-27 | 2000-07-04 | 株式会社電業社機械製作所 | Rotating body having one blade impeller and dynamic balancing method thereof |
| CN100540208C (en) * | 2006-12-22 | 2009-09-16 | 沈阳大陆激光技术有限公司 | A kind of renovation technique of centrifugal compressor runner blade |
| GB2463453B (en) * | 2008-09-06 | 2012-08-08 | Cummins Turbo Tech Ltd | Turbomachine |
| CN101362214B (en) * | 2008-09-11 | 2010-07-21 | 陈国兴 | Rotor cutting processing method using running balance indicating machine and special device thereof |
| CN103084778A (en) * | 2011-10-27 | 2013-05-08 | 南通大通宝富风机有限公司 | Precise mass decreasing method for calibrating dynamic balance of impeller |
| CN102658486A (en) * | 2012-04-27 | 2012-09-12 | 内蒙古五湖泵业有限公司 | Member for correcting static balance of electric diving pump impeller |
| CN202622274U (en) * | 2012-06-29 | 2012-12-26 | 宁夏青龙塑料管材有限公司 | Vacuum pump impeller dynamic balance alignment device |
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Address after: 412000 No. 2 Airway Road, Lusong District, Zhuzhou City, Hunan Province Patentee after: Hunan Nanfang General Aviation Engine Co., Ltd. Address before: 412002 No. 2 Aviation Road, Lusong District, Zhuzhou City, Hunan Province Patentee before: AVIC HUNAN GENERAL AVIATION ENGINE CO., LTD. |
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