CN108620820B - Anti-deformation machining method for sealing ring of medium-pressure air inlet of medium-pressure outer cylinder of steam turbine - Google Patents
Anti-deformation machining method for sealing ring of medium-pressure air inlet of medium-pressure outer cylinder of steam turbine Download PDFInfo
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Abstract
An anti-deformation processing method for a sealing ring of a medium-pressure air inlet of a medium-pressure outer cylinder of a steam turbine relates to an anti-deformation processing method for a sealing ring. The purpose is to solve the problem of poor product quality caused by high deformation of the inner circle diameter or the outer circle diameter of the medium-pressure air inlet sealing ring of the medium-pressure outer cylinder of the processed steam turbine. Rough turning a blank, rough turning the blank for natural aging treatment, semi-finish turning the blank for natural aging treatment, placing a cast iron mould on a vertical lathe workbench, clamping and aligning, turning the upper plane of the cast iron mould, performing excircle and end face alignment on the semi-finish turning the blank, turning the excircle, the inner circle and the upper and lower end faces of the semi-finish turning the blank, then performing natural aging treatment on the processed semi-finish turning the blank, turning the blank to the designed size of the excircle and the inner circle, and grinding the upper and lower end faces to the designed size. The diameter deformation of the inner circle and the outer circle of the sealing ring processed by the method is less than 0.02 mm. The invention is suitable for processing the sealing ring.
Description
Technical Field
The invention relates to a deformation-preventing machining method for a sealing ring.
Background
The sealing ring of the medium-pressure air inlet of the medium-pressure outer cylinder of the steam turbine is a thin-wall workpiece, the section of the sealing ring is rectangular, the material is 1Cr12Mo/B/HJ462, the diameter of the outer circle of the sealing ring is 522.5 +/-0.13 mm, the diameter of the inner circle is 492.8 +/-0.025 mm, the verticality between the inner circumferential surface and the upper and lower end surfaces is 0.02mm, the width is 14.55 +/-0.05 mm, the parallelism of the two end surfaces is 0.01mm, and the wall thickness is 15 mm; the existing processing method is that a horizontal lathe is adopted to process an outer circle and upper and lower end surfaces according to an inner circle matched with a tire, and then the inner circle and the upper and lower end surfaces are processed according to the outer circle matched with a cast iron tire; after machining, irregular deformation often occurs to the sealing ring, wherein the tolerance requirement of a design drawing is +/-0.025 mm, and the deformation of the diameter of the inner circle or the diameter of the outer circle obtained by the existing machining method is 0.20-0.28 mm, so that the product quality is seriously influenced.
Disclosure of Invention
The invention provides an anti-deformation processing method for a medium-pressure air inlet sealing ring of a medium-pressure outer cylinder of a steam turbine, aiming at solving the problem of poor product quality caused by high deformation of the inner circle diameter or the outer circle diameter of the medium-pressure air inlet sealing ring of the medium-pressure outer cylinder of the steam turbine processed by the existing method.
The anti-deformation processing method for the medium-pressure air inlet sealing ring of the medium-pressure outer cylinder of the steam turbine is carried out according to the following steps:
firstly, taking a steel plate blank, fixing the steel plate blank on a lathe, roughly turning the outer circle, the inner circle and the upper and lower end faces, and reserving 2mm machining allowance on each surface during rough turning to obtain a roughly turned blank;
the cutting parameters during rough machining of the excircle, the inner circle and the upper and lower end faces are as follows: the cutting depth is 0.4-0.6 mm, the feeding amount is 0.2-0.5 mm/r, and the cutting speed is 14-16 m/min;
the diameter of the outer circle of the rough turning blank is 522.5 +/-0.13; the diameter of the inner circle of the rough turning blank is 492.8 +/-0.025;
secondly, performing natural aging treatment on the rough turned blank for 46-50 hours;
measuring the actual measurement size of the rough turning blank, and processing a matched cast iron mould according to the actual measurement size, wherein the interference magnitude of the cast iron mould and the rough turning blank is 0-0.01 mm; semi-finish turning is carried out on the outer circle, the inner circle and the upper and lower end faces of the rough-turned blank, 1mm machining allowance is reserved on each face of the outer circle and the inner circle during semi-finish turning, and 0.2mm machining allowance is reserved on the upper and lower end faces to obtain a semi-finish-turned blank;
the cutting parameters when the outer circle, the inner circle and the upper and lower end faces of the rough turning blank are subjected to semi-finish turning are as follows: the cutting depth is 0.15-0.25 mm, the feeding amount is 0.1-0.2 mm/r, and the cutting speed is 19-21 m/min;
fourthly, naturally aging the semi-finished turning blank for 46-50 hours;
placing the cast iron mould obtained in the third step on a vertical lathe workbench, clamping and aligning, turning the upper plane of the cast iron mould, wherein the removal amount is 0.5-1 mm, placing the semi-finish turning blank on the upper plane of the cast iron mould, taking the design shape and size of a workpiece as a reference, aligning the outer circle and the end face of the semi-finish turning blank until the deviation is less than 0.02mm, screwing a pressing plate bolt, turning the outer circle, the inner circle, the upper end face and the lower end face of the semi-finish turning blank, and keeping the turning allowance of 0.20mm on each surface during turning; loosening the pressing plate 2-3 times in the turning process; in the turning process, the pressing plate is loosened for 2-3 times to release the machining stress;
a torque wrench is adopted when the pressing plate bolt is screwed; the torque is 15-25 N.m;
the cutting parameters for turning the excircle, the inner circle and the upper and lower end faces of the semi-finish turning blank are as follows: the cutting depth is 0.9-1.1 mm, the feeding amount is 0.1-0.2 mm/r, and the cutting speed is 19-21 m/min;
sixthly, performing natural aging treatment on the semi-finish turning blank processed in the step five for 46-50 hours;
seventhly, taking the designed shape and size of the workpiece as a reference, aligning the outer circle and the end face of the blank subjected to the six steps of natural aging treatment until the deviation is less than 0.02mm, screwing a pressing plate bolt, and turning the blank subjected to the six steps of natural aging treatment to the designed size of the outer circle and the inner circle;
the cutting parameters during turning are as follows: the cutting depth is 0.04-0.06 mm, the feeding amount is 0.09-0.11 mm/r, and the cutting speed is 19-21 m/min;
a torque wrench is adopted when the pressing plate bolt is screwed; the torque is 15-25 N.m;
and eighthly, grinding the upper end face and the lower end face of the blank obtained in the step seven to the designed size, and finishing.
The invention has the following beneficial effects:
based on the existing production practice, the quality of the product is controlled within the range of drawing requirements, the drawing size, roughness and flatness requirements are guaranteed, the processing quality of the product can be guaranteed, the excircle diameter deformation of the medium-pressure air inlet sealing ring of the medium-pressure outer cylinder of the steam turbine processed by the method is less than 0.02mm, and the deformation in the height direction is less than 0.02 mm.
Description of the drawings:
FIG. 1 is a schematic diagram of a cast iron mold and a semi-finish-turned blank;
fig. 2 is a sectional view taken along the direction of a-a in fig. 1, wherein 1 is a cast iron mold, 2 is a semi-finish turning blank of a medium pressure air inlet sealing ring of a medium pressure outer cylinder of a steam turbine, 3 is a pressure plate, and 4 is a bolt.
The specific implementation mode is as follows:
the technical scheme of the invention is not limited to the specific embodiments listed below, and any reasonable combination of the specific embodiments is included.
The first embodiment is as follows: the deformation preventing processing method for the sealing ring of the medium-pressure air inlet of the medium-pressure outer cylinder of the steam turbine in the embodiment is described by combining the following steps with the accompanying drawings of fig. 1 and fig. 2:
firstly, taking a steel plate blank, fixing the steel plate blank on a lathe, roughly turning the outer circle, the inner circle and the upper and lower end faces, and reserving 2mm machining allowance on each surface during rough turning to obtain a roughly turned blank;
secondly, performing natural aging treatment on the rough turned blank for 46-50 hours;
measuring the actual measurement size of the rough turning blank, and processing a matched cast iron mould according to the actual measurement size, wherein the interference magnitude of the cast iron mould and the rough turning blank is 0-0.01 mm; semi-finish turning is carried out on the outer circle, the inner circle and the upper and lower end faces of the rough-turned blank, 1mm machining allowance is reserved on each face of the outer circle and the inner circle during semi-finish turning, and 0.2mm machining allowance is reserved on the upper and lower end faces to obtain a semi-finish-turned blank;
fourthly, naturally aging the semi-finished turning blank for 46-50 hours;
placing the cast iron mould obtained in the third step on a vertical lathe workbench, clamping and aligning, turning the upper plane of the cast iron mould, wherein the removal amount is 0.5-1 mm, placing the semi-finish turning blank on the upper plane of the cast iron mould, taking the design shape and size of a workpiece as a reference, aligning the outer circle and the end face of the semi-finish turning blank until the deviation is less than 0.02mm, screwing a pressing plate bolt, turning the outer circle, the inner circle, the upper end face and the lower end face of the semi-finish turning blank, and keeping the turning allowance of 0.20mm on each surface during turning; loosening the pressing plate 2-3 times in the turning process;
sixthly, performing natural aging treatment on the semi-finish turning blank processed in the step five for 46-50 hours;
seventhly, taking the designed shape and size of the workpiece as a reference, aligning the outer circle and the end face of the blank subjected to the six steps of natural aging treatment until the deviation is less than 0.02mm, screwing a pressing plate bolt, and turning the blank subjected to the six steps of natural aging treatment to the designed size of the outer circle and the inner circle;
and eighthly, grinding the upper end face and the lower end face of the blank obtained in the step seven to the designed size, and finishing.
The embodiment has the following beneficial effects:
the method is based on the existing production practice, the product quality is controlled within the range of drawing requirements, the drawing size, the roughness and the flatness requirements are guaranteed, the processing quality of the product can be guaranteed, the excircle diameter deformation of the medium-pressure air inlet sealing ring of the medium-pressure outer cylinder of the steam turbine processed by the method is less than 0.02mm, and the deformation in the height direction is less than 0.02 mm.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: step one, cutting parameters during rough machining of the outer circle, the inner circle and the upper and lower end faces are as follows: the cutting depth is 0.4-0.6 mm, the feeding amount is 0.2-0.5 mm/r, and the cutting speed is 14-16 m/min. Other steps and parameters are the same as in the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: the diameter of the outer circle of the rough turning blank is 522.5 +/-0.13; the diameter of the inner circle of the rough turning blank is 492.8 +/-0.025. Other steps and parameters are the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: and step three, cutting parameters during semi-finish turning of the excircle, the inner circle and the upper and lower end faces of the rough-turned blank are as follows: the cutting depth is 0.15-0.25 mm, the feeding amount is 0.1-0.2 mm/r, and the cutting speed is 19-21 m/min. Other steps and parameters are the same as in one of the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: fifthly, a torque wrench is adopted when the pressing plate bolt is screwed; the torque is 15 to 25 N.m. Other steps and parameters are the same as in one of the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is: fifthly, the cutting parameters for turning the outer circle, the inner circle, the upper end face and the lower end face of the semi-finished blank are as follows: the cutting depth is 0.9-1.1 mm, the feeding amount is 0.1-0.2 mm/r, and the cutting speed is 19-21 m/min. Other steps and parameters are the same as in one of the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: seventhly, the cutting parameters in the turning process are as follows: the cutting depth is 0.04-0.06 mm, the feeding amount is 0.09-0.11 mm/r, and the cutting speed is 19-21 m/min. Other steps and parameters are the same as in one of the first to sixth embodiments.
The specific implementation mode is eight: the present embodiment differs from one of the first to seventh embodiments in that: seventhly, adopting a torque wrench when screwing the pressing plate bolt; the torque is 15 to 25 N.m. Other steps and parameters are the same as in one of the first to seventh embodiments.
The following examples were used to demonstrate the beneficial effects of the present invention:
example 1:
the anti-deformation processing method for the medium-pressure air inlet sealing ring of the medium-pressure outer cylinder of the steam turbine in the embodiment comprises the following steps of:
firstly, taking a steel plate blank, fixing the steel plate blank on a lathe, roughly turning the outer circle, the inner circle and the upper and lower end faces, and reserving 2mm machining allowance on each surface during rough turning to obtain a roughly turned blank;
the cutting parameters during rough machining of the excircle, the inner circle and the upper and lower end faces are as follows: the cutting depth is 0.5mm, the feed rate is 0.5mm/r, and the cutting speed is 15 m/min;
the diameter of the outer circle of the rough turning blank is 522.5 +/-0.13; the diameter of the inner circle of the rough turning blank is 492.8 +/-0.025;
secondly, performing natural aging treatment on the rough turning blank for 48 hours;
measuring the actual measurement size of the rough turning blank, and processing a matched cast iron mould according to the actual measurement size, wherein the interference magnitude of the cast iron mould and the rough turning blank is 0.01 mm; semi-finish turning is carried out on the outer circle, the inner circle and the upper and lower end faces of the rough-turned blank, 1mm machining allowance is reserved on each face of the outer circle and the inner circle during semi-finish turning, and 0.2mm machining allowance is reserved on the upper and lower end faces to obtain a semi-finish-turned blank;
the cutting parameters when the outer circle, the inner circle and the upper and lower end faces of the rough turning blank are subjected to semi-finish turning are as follows: the cutting depth is 0.2mm, the feed rate is 0.1mm/r, and the cutting speed is 20 m/min;
fourthly, naturally aging the semi-finished blank for 48 hours;
fifthly, placing the cast iron mould obtained in the third step on a vertical lathe workbench, clamping and aligning, turning the upper plane of the cast iron mould, wherein the removal amount is 1mm, placing the semi-finish turning blank on the upper plane of the cast iron mould, aligning the outer circle and the end surface of the semi-finish turning blank until the deviation is less than 0.02mm by taking the designed shape and the size of a workpiece as the reference, screwing a pressing plate bolt, turning the outer circle, the inner circle, the upper end surface and the lower end surface of the semi-finish turning blank, and keeping the turning allowance of 0.20mm on each surface during turning; loosening the pressure plate 3 times in the turning process; the machining stress can be released by loosening the pressure plate for 3 times in the turning process;
a torque wrench is adopted when the pressing plate bolt is screwed; the moment is 15 N.m;
the cutting parameters for turning the excircle, the inner circle and the upper and lower end faces of the semi-finish turning blank are as follows: the cutting depth is 0.1mm, the feed rate is 0.1mm/r, and the cutting speed is 20 m/min;
sixthly, performing natural aging treatment on the semi-finish turning blank processed in the step five for 48 hours;
seventhly, taking the designed shape and size of the workpiece as a reference, aligning the outer circle and the end face of the blank subjected to the six steps of natural aging treatment until the deviation is less than 0.02mm, screwing a pressing plate bolt, and turning the blank subjected to the six steps of natural aging treatment to the designed size of the outer circle and the inner circle;
the cutting parameters during turning are as follows: the cutting depth is 0.05mm, the feed rate is 0.1mm/r, and the cutting speed is 20 m/min;
a torque wrench is adopted when the pressing plate bolt is screwed; the moment is 15 N.m;
and eighthly, grinding the upper end face and the lower end face of the blank obtained in the step seven to the designed size, and finishing.
The excircle diameter deflection of the medium-pressure air inlet sealing ring of the medium-pressure outer cylinder of the steam turbine processed by the embodiment is less than 0.005mm, and the deflection in the height direction is less than 0.005 mm.
Claims (8)
1. The anti-deformation processing method for the sealing ring of the medium-pressure air inlet of the medium-pressure outer cylinder of the steam turbine is characterized by comprising the following steps of: the method comprises the following steps:
firstly, taking a steel plate blank, fixing the steel plate blank on a lathe, roughly turning the outer circle, the inner circle and the upper and lower end faces, and reserving 2mm machining allowance on each surface during rough turning to obtain a roughly turned blank;
secondly, performing natural aging treatment on the rough turned blank for 46-50 hours;
measuring the actual measurement size of the rough turning blank, and processing a matched cast iron mould according to the actual measurement size, wherein the interference magnitude of the cast iron mould and the rough turning blank is 0-0.01 mm; semi-finish turning is carried out on the outer circle, the inner circle and the upper and lower end faces of the rough-turned blank, 1mm machining allowance is reserved on each face of the outer circle and the inner circle during semi-finish turning, and 0.2mm machining allowance is reserved on the upper and lower end faces to obtain a semi-finish-turned blank;
fourthly, naturally aging the semi-finished turning blank for 46-50 hours;
placing the cast iron mould obtained in the third step on a vertical lathe workbench, clamping and aligning, turning the upper plane of the cast iron mould, wherein the removal amount is 0.5-1 mm, placing the semi-finish turning blank on the upper plane of the cast iron mould, taking the design shape and size of a workpiece as a reference, aligning the outer circle and the end face of the semi-finish turning blank until the deviation is less than 0.02mm, screwing a pressing plate bolt, turning the outer circle, the inner circle, the upper end face and the lower end face of the semi-finish turning blank, and keeping the turning allowance of 0.20mm on each surface during turning; loosening the pressing plate 2-3 times in the turning process;
sixthly, performing natural aging treatment on the semi-finish turning blank processed in the step five for 46-50 hours;
seventhly, taking the designed shape and size of the workpiece as a reference, aligning the outer circle and the end face of the blank subjected to the six steps of natural aging treatment until the deviation is less than 0.02mm, screwing a pressing plate bolt, and turning the blank subjected to the six steps of natural aging treatment to the designed size of the outer circle and the inner circle;
and eighthly, grinding the upper end face and the lower end face of the blank obtained in the step seven to the designed size, and finishing.
2. The anti-deformation processing method for the sealing ring of the medium-pressure air inlet of the medium-pressure outer cylinder of the steam turbine according to claim 1, characterized by comprising the following steps of: step one, cutting parameters during rough machining of the outer circle, the inner circle and the upper and lower end faces are as follows: the cutting depth is 0.4-0.6 mm, the feeding amount is 0.2-0.5 mm/r, and the cutting speed is 14-16 m/min.
3. The anti-deformation processing method for the sealing ring of the medium-pressure air inlet of the medium-pressure outer cylinder of the steam turbine according to claim 1, characterized by comprising the following steps of: the diameter of the outer circle of the rough turning blank is 522.5 +/-0.13; the diameter of the inner circle of the rough turning blank is 492.8 +/-0.025.
4. The anti-deformation processing method for the sealing ring of the medium-pressure air inlet of the medium-pressure outer cylinder of the steam turbine according to claim 1, characterized by comprising the following steps of: and step three, cutting parameters during semi-finish turning of the excircle, the inner circle and the upper and lower end faces of the rough-turned blank are as follows: the cutting depth is 0.15-0.25 mm, the feeding amount is 0.1-0.2 mm/r, and the cutting speed is 19-21 m/min.
5. The anti-deformation processing method for the sealing ring of the medium-pressure air inlet of the medium-pressure outer cylinder of the steam turbine according to claim 1, characterized by comprising the following steps of: fifthly, a torque wrench is adopted when the pressing plate bolt is screwed; the torque is 15 to 25 N.m.
6. The anti-deformation processing method for the sealing ring of the medium-pressure air inlet of the medium-pressure outer cylinder of the steam turbine according to claim 1, characterized by comprising the following steps of: fifthly, the cutting parameters for turning the outer circle, the inner circle, the upper end face and the lower end face of the semi-finished blank are as follows: the cutting depth is 0.9-1.1 mm, the feeding amount is 0.1-0.2 mm/r, and the cutting speed is 19-21 m/min.
7. The anti-deformation processing method for the sealing ring of the medium-pressure air inlet of the medium-pressure outer cylinder of the steam turbine according to claim 1, characterized by comprising the following steps of: seventhly, the cutting parameters in the turning process are as follows: the cutting depth is 0.04-0.06 mm, the feeding amount is 0.09-0.11 mm/r, and the cutting speed is 19-21 m/min.
8. The anti-deformation processing method for the sealing ring of the medium-pressure air inlet of the medium-pressure outer cylinder of the steam turbine according to claim 1, characterized by comprising the following steps of: seventhly, adopting a torque wrench when screwing the pressing plate bolt; the torque is 15 to 25 N.m.
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| CN111702422A (en) * | 2020-06-30 | 2020-09-25 | 重庆红江机械有限责任公司 | Machining method of crosshead sliding sleeve |
| CN112894266A (en) * | 2020-12-18 | 2021-06-04 | 四川德兰航宇科技发展有限责任公司 | Machining method of ring forging with complex special-shaped cross section |
| CN113305511B (en) * | 2021-05-27 | 2022-07-22 | 哈尔滨汽轮机厂有限责任公司 | Processing method for preventing elastic ring from deforming |
| CN115255812B (en) * | 2022-06-15 | 2023-08-08 | 中船澄西船舶修造有限公司 | Manufacturing process of large-sized special-coated double-sided seat board |
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| CN102501008A (en) * | 2011-10-26 | 2012-06-20 | 哈尔滨汽轮机厂有限责任公司 | Method for processing sealing ring |
| CN102649164B (en) * | 2012-04-28 | 2014-05-14 | 浙江坤博机械制造有限公司 | Machining method for stainless steel seal rings in large valves |
| WO2013163968A1 (en) * | 2012-05-03 | 2013-11-07 | Federal-Mogul Burscheid Gmbh | Method for the production of metallic slide ring seals |
| CN103240575B (en) * | 2013-05-14 | 2015-06-10 | 西安北方光电科技防务有限公司 | Method for improving sheet annular titanium alloy gear part machining precision |
| CN103659158A (en) * | 2013-12-05 | 2014-03-26 | 重庆跃进机械厂有限公司 | Method for machining ultrathin wall sleeve parts |
| CN104148896A (en) * | 2014-08-04 | 2014-11-19 | 贵州航宇科技发展股份有限公司 | Manufacturing method of GH4169 high-temperature alloy semi-ring |
| CN105522341A (en) * | 2015-11-12 | 2016-04-27 | 陕西一品达石化有限公司 | Austenitic stainless steel thin-walled pipe machining method |
| CN105328209B (en) * | 2015-12-04 | 2017-09-12 | 无锡易通精密机械股份有限公司 | A kind of Vehicle Processing technique of aircraft air intake casing |
| CN105563042A (en) * | 2016-01-29 | 2016-05-11 | 柳州市安龙机械设备有限公司 | Machining method for hard-alloy sealing ring |
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| CN106583755A (en) * | 2017-02-20 | 2017-04-26 | 兰州兰石重型装备股份有限公司 | Machining method for omega-shaped ring sealing washer |
| CN206544034U (en) * | 2017-02-20 | 2017-10-10 | 兰州兰石重型装备股份有限公司 | Process the Special mould of Ω ring seal washers |
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Effective date of registration: 20221221 Address after: 150000 building 3, high tech production base, Nangang District, Harbin City, Heilongjiang Province Patentee after: HARBIN TURBINE Co.,Ltd. Patentee after: HADIAN POWER EQUIPMENT NATIONAL ENGINEERING RESEARCH CENTER CO.,LTD. Address before: 150046 No. three power road 345, Xiangfang District, Heilongjiang, Harbin Patentee before: HARBIN TURBINE Co.,Ltd. |