CN113600976A - DN650 metal flexible connecting pipe installation size control method - Google Patents
DN650 metal flexible connecting pipe installation size control method Download PDFInfo
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- CN113600976A CN113600976A CN202110807072.7A CN202110807072A CN113600976A CN 113600976 A CN113600976 A CN 113600976A CN 202110807072 A CN202110807072 A CN 202110807072A CN 113600976 A CN113600976 A CN 113600976A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
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Abstract
The invention provides a DN650 metal flexible connecting pipe installation size control method, which is suitable for controlling the installation precision of an ultra-large-diameter metal flexible connecting pipe and ensuring the installation quality of the metal flexible connecting pipe. The invention takes advantage of the traditional method, and provides a set of DN650 installation precision control process method through scientific analysis and experimental research, thereby effectively improving the pipeline installation quality of the circulating water system. The method is suitable for popularization and application as a DN650 metal flexible connecting pipe installation size control method.
Description
Technical Field
The invention relates to the installation of large-caliber metal flexible connecting pipes in the field of ships, in particular to a DN650 metal flexible connecting pipe installation size control method.
Background
The flexible connection is also called flexible connection or flexible connection. The connecting mode is that the connecting position is allowed to axially extend and retract, and is folded and generates a certain displacement amount in the vertical axial direction. The connection mode adopts elastic joints such as rubber joints, corrugated pipes and the like, pipe fittings with special structures, flexible fillers and the like. It has vibration isolation, noise reduction, and can prevent displacement from damaging pipeline and regulate installation error.
The flexible connection is generally divided into three connecting pieces, namely a vacuum rubber pipe, a plastic pipe and a metal pipe, wherein the vacuum rubber pipe is mostly used for connecting pipelines with the diameter of less than 50mm, the impact resistance of the plastic flexible connecting piece is weaker, and the metal pipe has the capabilities of providing axial displacement and transverse displacement compensation due to strong impact resistance and good flexibility, can bear higher action pressure, has the characteristics of vibration reduction and impact resistance, ensures that the installation size of the circulating water system is accurately controlled as an important guarantee for ensuring the safe operation of the circulating water system, and is suitable for being applied to the circulating water system of ship products.
The existing circulating water system adopts phi 680 multiplied by 15 (nominal diameter DN 650) ultra-large-diameter stainless steel pipelines, DN650 metal flexible connecting pipes are an important accessory in the circulating water system of ship products, the pipelines are made by rolling stainless steel plates, and the flanges adopt butt welding flanges with the outer diameter phi 930, so that the limit of the maximum specification phi 580 multiplied by 15 (nominal diameter DN 550) and the outer diameter phi 800 of the original ship product system pipelines is broken through, and the traditional manufacturing mode of processing and forming after welding blank flanges and pipelines is also broken through.
However, referring to the mounting accuracy control method of the DN550 metal flexible connection pipe in the prior art, the pipeline needs to be welded and machined for multiple times, which increases the risks of flaw detection repair and machining accuracy control, and cannot ensure the mounting accuracy of the DN650 metal flexible connection pipe, increases the construction cost, prolongs the construction period, and makes the product quality unstable.
Disclosure of Invention
In order to improve the installation precision of the DN650 metal flexible connecting pipe, the invention provides a control method capable of ensuring the installation precision of the DN650 metal flexible connecting pipe, which is suitable for controlling the installation precision of the ultra-large-diameter metal flexible connecting pipe and ensuring the installation quality of the metal flexible connecting pipe. The invention takes advantages of the traditional method, and provides a set of DN650 installation precision control process method through scientific analysis and experimental research, thereby effectively improving the pipeline installation quality of the circulating water system. The method is suitable for being used as a control method for ensuring the installation accuracy of the DN650 metal flexible pipe.
The technical scheme adopted by the invention for solving the technical problem is as follows:
when a pipeline is sampled, the gap between the sample pipe and the sample tire flange is controlled by improving the precision of sample pipe bedding-in, so that the welding deformation is effectively controlled; the method that one side of the sample tube is welded firstly and the other side of the sample tube is welded secondly is adopted, so that the welding stress between the sample tube and the sample tire flange is reduced; by measuring the sizes of the DN650 metal flexible connecting pipe before and after pipeline sampling, the axial size change caused by the metal flexible connecting pipe after pipeline sampling and welding is calculated, and the axial size change is used as the compensation quantity for later-stage sample tire manufacturing, so that the manufacturing precision of the finished product pipeline is improved.
Before the pipeline is manufactured, the same batch of pipes are adopted for welding test to obtain the welding shrinkage of the pipeline, and the shrinkage is reserved during pipeline grinding, so that the length of the pipeline is effectively controlled; after sampling, the pipeline fixes the sample tire on the platform through the fixed blind plate in a welding manner, and the positioning pin is arranged to ensure the centering and positioning precision between the flanges. After the fixed blind plate is welded, removing a fixed flange at one end of the sample tire to keep the fixed flange in a free state, and measuring the axial deflection and radial deflection of the sample tire flange and the fixed blind plate to obtain the deformation caused by welding of the fixed blind plate, wherein the deformation is used for adjusting and centering monitoring in the later stage of pipeline manufacturing and compensating the positioning deviation caused by welding and fixing the sample tire; before the pipeline is ground and matched, an alignment tool is adopted for adjustment, and finished flanges are positioned according to circumferential deflection and radial offset after the sample tires are welded and fixed; when the pipeline is ground, the allowance of the pipeline is accurately removed through two times of processing; meanwhile, considering the cold shrinkage of welding, reserving the shrinkage obtained in the previous welding test during the research and preparation, and effectively controlling the length of the welded pipeline; the pipeline and the flange are welded and positioned by adopting the positioning chock blocks, the welding deformation is monitored by using the dial indicator during welding, and the welding position is adjusted by welding in a 'reversible deformation' mode, so that the welding deformation is effectively controlled.
When the flexible connecting pipe is installed, the compression amount of the wound gasket is controlled through fastening of the bolts, and the size of the DN650 metal flexible connecting pipe after installation is ensured, so that the flexible connecting pipe meets the use requirement.
The method has the advantages that the shortening amount and the welding deformation value of the pipeline welding do not have any reference data, and the construction faces unprecedented difficulties. The invention breaks through the traditional manufacturing mode of processing and forming after welding the blank flange and the pipeline, the finished flange is directly welded with the pipeline for the first time, the compensation amount and the shortening amount required by pipeline welding are preset, a set of scientific, reasonable and efficient technological method is provided through experimental research, each construction link is finely controlled, the construction efficiency and the construction quality are improved, the welding shortening amount of the stainless steel pipeline is obtained through a welding test, and the precision of pipeline manufacturing is effectively improved. The method is suitable for popularization and application as a DN650 metal flexible connecting pipe installation size control method.
Drawings
FIG. 1 is a schematic diagram of a pipeline sampling;
FIG. 2 is a schematic view of a pipe welding shortening test;
FIG. 3 is a sectional view of a pipe welding shortening test;
FIG. 4 is a front view of the positioning block;
FIG. 5 is a side view of a locating chock;
FIG. 6 is a schematic view of a sample tire platform fixing structure;
FIG. 7 is a schematic view of a first pass of a blank tube;
FIG. 8 is a schematic view of a second pass of the blank tube;
FIG. 9 is a schematic view of the welding of the finished flange to the blank pipe.
In the figure, 1, a circulating water pump; DN650 metal flexible connecting pipe; 3. a sample tire flange I; 4. a sample tire flange II; 5. a sample tube I; 6. a sample tube II; 7. sampling a tire; 8. welding short pipes; 9. positioning the chock block; 10. a fixed flange I; 11. a bolt; 12. a nut; 13. adjusting a jackscrew; 14. adjusting the bracket; 15. positioning pins; 16. a back support; 17. laterally supporting; 18. a cushion block I; 19. a support block; 20. a platform; 21. a finished flange I; 22. a cushion block II; 23. a sample rod; 24. a blank pipe; 25. a dial indicator; 26. a finished flange II; 27. and fixing a flange II.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
DN650 metal flexible connecting pipe installation process:
firstly, adjusting the size of the DN650 metal flexible connecting pipe 2; secondly, sampling the pipeline and determining the compensation quantity of the sample tire 7; secondly, acquiring post-welding shortening data by a pipeline welding shortening test, and manufacturing a pipeline; and finally, installing the pipeline.
According to the installation requirement of the DN650 metal flexible connecting pipe 2, before the pipeline sampling, the axial size of the DN650 metal flexible connecting pipe 2 is adjusted to a target value of 822.50 mm.
And after the axial size of the DN650 metal flexible connecting pipe 2 is adjusted to be qualified, pipeline sampling is started.
Connecting a sample tire flange I3 and a sample tire flange II 4 with a DN650 metal flexible connecting pipe 2 and a circulating water pump 1 respectively, and installing a metal winding gasket between the flanges; after the flanges are uniformly and symmetrically screwed, the gap between each group of flanges is measured, and the deviation of each point of the circumference is not more than 0.2 mm.
Bending sample tire tubes in advance in an inner field according to the shape of a field sampling pipeline, wherein one sample tire tube I5 with phi 219 multiplied by 7mm and three sample tire tubes II 6 with phi 108 multiplied by 4mm are reserved at each end of the pipeline length on the basis of the theoretical length, and the matching allowance is not less than 100 mm; the sample tire tube I5 and the sample tire tube II 6 are ground and matched on site, so that the end faces of the sample tire tube I5 and the sample tire tube II 6 are tightly attached to the end faces of the sample tire flange I3 and the sample tire flange II 4, and the gaps of the sample tire tube I5 and the sample tire tube II 6 are not more than 0.2 mm; after the sample tube is completely assembled, one end pipeline is welded, and the other end pipeline is welded after the to-be-welded joint is completely cooled, so that the welding stress is reduced.
After the sample tube is welded and naturally cooled, loosening the adjusting pull rod of the DN650 metal flexible connecting tube 2, measuring the axial size of the DN650 metal flexible connecting tube 2 by using a vernier caliper, uniformly distributing four points on the circumference, marking by using numbers 1, 2, 3 and 4, comparing with the target size, and calculating to obtain the axial size of the DN650 metal flexible connecting tube 2; the compensation amount of the sample tire 7 is obtained by the fact that the positive value is tensile and the negative value is compression due to the fact that the sample tire pipe is welded to generate an over-difference value, the positive value is an increasing amount, the negative value is a shortening amount, and the compensation amount is added during later-stage pipeline manufacturing so as to ensure manufacturing accuracy of a finished product pipeline. The amount of compensation for tire 7 is shown in table 1.
TABLE 1 sample tire compensation quantity (unit mm)
| | 1 | 2 | 3 | 4 |
| Axial target size | 822.50 | 822.50 | 822.50 | 822.50 |
| Axial dimension after welding | 822.76 | 822.50 | 823.10 | 822.88 |
| Variance value | 0.26 | 0 | 0.60 | 0.38 |
| Amount of compensation | 0.26 | 0 | 0.60 | 0.38 |
Note: because the three points determine a plane, when the subsequent pipeline is manufactured, the four-point compensation amount only needs to consider the three points, and the other point can be cancelled.
Before the sample tire 7 is disassembled, the axial measuring point position of the DN650 metal flexible connecting pipe 2 is respectively transplanted to the excircle of the I3 flange of the sample tire, the typing head is marked, meanwhile, the installation marking line is made by using a double vertical line '|' at the same position of the excircle of the II 4 flange of the sample tire and the excircle of the 1 flange of the circulating water pump, and the marking position is marked with a sample punching hole.
Because the general metal materials can cause the shrinkage of the materials under the action of thermal stress after being welded, and the shrinkage of the materials and specifications are different; in order to avoid pipeline length change caused by the fact that the route of the stainless steel pipe is shortened after welding, the pipeline welding shortening amount test must be carried out before pipeline welding, so that reliable shortening amount data can be obtained, and the shortening amount is reserved during pipeline grinding, so that the length of the pipeline is accurately controlled; during testing, selecting pipes in the same batch as the product pipeline, cutting out four welding short pipes 8, and performing two sets of welding tests, wherein each welding short pipe 8 is 100mm long, and positioning welding is performed on the two welding short pipes 8 by using eight positioning plugs 9 after the two welding short pipes 8 are aligned, so that the gap between the welding short pipes 8 is ensured to be 3 mm; manual argon arc welding bottoming and manual electric arc welding filling are adopted for welding; before bottoming, the open end and the welding seam part of the welding short pipe 8 are plugged by using an adhesive tape, so that the inside of the pipeline is filled with argon; when bottoming, the welding current is 100A, and the welding speed is 8 cm/min; during filling, the welding current is 120A, and the welding speed is 8 cm/min; the temperature between the channels is controlled to be below 100 ℃ in the whole welding process; measuring the length L of the pipeline before welding by using a vernier caliper after positioning welding, uniformly distributing four points on the circumference for measurement, and taking an average value; measuring the length L' of the pipeline after welding by using a vernier caliper, measuring four points uniformly distributed on the circumference, and averaging; specific data are shown in Table 2
TABLE 2. phi 680X 15 stainless steel pipe shortening after welding (unit mm)
| Test group | Number of craters | Preweld length (L) | Postweld length (L') | Amount of shortening |
| 1 | 1 | 203.10 | 198.90 | 4.20 |
| 2 | 1 | 203.00 | 198.90 | 4.10 |
The experiment confirms that the shortening of the stainless steel pipe with the diameter of 680 multiplied by 15mm after welding is about 4mm, and the data is used as the reserved amount basis during the pipeline grinding.
Placing the sample tire 7 on a platform 20, and supporting and leveling the sample tire by using an adjusting jackscrew 13, an adjusting bracket 14 and a supporting block 19; the sample tire flanges I3 and II 4 at two ends of the sample tire 7 are respectively connected with the fixing flange I10 and the fixing flange II 27 through bolts 11 and nuts 12, and each group of flanges is provided with four positioning pins 15 so as to ensure the centering between the two flanges; because the height of the sealing surface of the flange is 5mm, the welding shortening amount which is reserved before the pipeline is welded is 4mm, in order to ensure the normal disassembly and assembly of the pipeline in the process of research and distribution, enough gaps must be reserved among the fixed flange I10 and the fixed flange II 27, the sample tire flange I3 and the sample tire flange II 4, and therefore a cushion block I18 needs to be installed among the connecting flanges; the thickness of the cushion block I18 at the end of the sample tire flange II 4 is 25mm, the thickness of the cushion block I18 at the end of the sample tire flange I3 is in consideration of compensation quantity on the basis of 25mm standard, the thickness of each point adjusting cushion block is obtained by calculation according to the compensation quantity value in the table 1, wherein the four-point compensation quantity only takes three points 1, 2 and 3, and the other point is obtained by calculation according to the principle of 'coplanar four-point diagonal sum equality', and the specific data are shown in the table 3; after the sample tire flange I3 and the sample tire flange II 4 are evenly tightened with the fixing flange I10 and the fixing flange II 27, the fixing flange I10 and the fixing flange II 27 are welded on the platform 20 through the back support 16 and the lateral support 17.
TABLE 3 cushion block I thickness (unit mm)
| Position of | 1 | 2 | 3 | 4 |
| Tyre flange I end (connecting metal flexible pipe end) | 24.74 | 25.00 | 24.40 | 24.24 |
| Sample tire flange II end (connecting circulating water pump inlet end) | 25.00 | 25.00 | 25.00 | 25.00 |
After the fixing flange I10 and the fixing flange II 27 are welded, in order to avoid deformation of the sample tire 7 caused by welding, the connection between the sample tire 7 and the fixing flange I10 is loosened, the axial deviation and the radial deviation between the two flanges are measured, and deviation compensation is carried out when the finished flange I21 is positioned; before the sample tire 7 is disassembled, the measurement marks and the installation lines on the sample tire flange I3 and the sample tire flange II 4 are transplanted to the corresponding positions of the fixed flange I10 and the fixed flange II 27.
Removing the sample tire 7, connecting the finished flange I21 and the finished flange II 26 with the fixing flange I10 and the fixing flange II 27 by using bolts 11 and nuts 12, installing four positioning pins 15 on each group of flanges, installing cushion blocks II 22 between the flanges, wherein the thickness is 10mm, and the flanges are convenient to disassemble and assemble; after the flange is uniformly tightened by bolts 11 and nuts 12, measuring the circumferential clearance of the flange, wherein the deviation is not more than 0.10 mm; bending a sample rod 23 by using round steel with the diameter of 8mm in advance according to the appearance of the blank pipe, inserting the sample rod 23 into a finished product flange I21 and a finished product flange II 26, adjusting the position of the sample rod 23 to ensure that the sample rod 23 is vertical to the end faces of the finished product flange I21 and the finished product flange II 26, marking the sample rod 23 at the moment, enabling a marking line to be flush with the end faces of the finished product flange I21 and the finished product flange II 26, drawing a first allowance processing line on the blank pipe 24 by using the sample rod 23, roughly processing, and cutting off redundant pipes by using a sawing machine according to the marking position; during cutting, in order to facilitate the second alignment and scribing of the blank pipe 24 in the later stage, the cutting position is controlled to be close to the inner side of the machining line by 2-3 mm.
Loosening the finished flange I21, taking out the cushion block II 22, adjusting the position of the finished flange I21 relative to the fixed flange I10 by adjusting the jackscrew 13 according to the axial deviation and the radial deviation measured when the sample tire 7 is welded and fixed, and further compensating the welding deformation when the fixed flange I10 and the fixed flange II 27 are welded; placing the blank pipe 24 subjected to the first allowance processing between a finished flange I21 and a finished flange II 26, aligning the blank pipe 24 with the interface ends of the finished flange I21 and the finished flange II 26 by using a temporary support, and checking radial deviation by using a cutting rule, wherein the deviation is not more than 0.10 mm; measuring the neck length B of the finished flange I21 and the finished flange II 26, measuring the distance from the end face of the bolt hole to the end face of the groove, then drawing a second allowance processing line on the blank pipe 24 by taking the end faces of the bolt holes of the finished flange I21 and the finished flange II 26 as a reference and taking the neck length B +13mm as a marking length, finishing, removing redundant pipes by using a boring machine according to the marking position, and processing a pipeline welding groove; description of the drawings: according to data obtained by an early-stage welding shortening test, the difference between the gap between the finished flange I21 and the finished flange II 26 and the gap between the finished flange I10 and the gap between the finished flange II 27 and the sample tire 7 is 15mm when the finished flange I21 and the finished flange II 27 are fixed, the gap between welding openings is 3mm, 1mm of grinding allowance is reserved, and the length of a scribing line is obtained after integral calculation, wherein the length of the scribing line is 15-4+3-1=13 mm.
The finished flange II 26 is disassembled to be connected with the fixed flange II 27, a cushion block I18 with the thickness of 25mm is arranged between the flanges, four positioning pins 15 are arranged, after the flanges are uniformly tightened by bolts 11 and nuts 12, the circumferential clearance of the flanges is measured, and the deviation is not more than 0.10 mm; the positions of a finished flange I21 and a fixed flange I10 are adjusted through an adjusting bracket 14 and an adjusting jackscrew 13, the flange gap is the thickness value of a cushion block I18 at the flange I5 end of a sample tire in the table 3, and the axial deviation and the radial deviation of the sample tire 7 during fixed welding are considered; placing the blank pipe 24 subjected to the second allowance processing between a finished flange I21 and a finished flange II 26, and aligning the blank pipe with the finished flange I21 and the finished flange II 26 by using a temporary support to ensure that the gap of a connecting groove is 3-3.5 mm and the deviation is not more than 0.2 mm; if the requirements are not met, properly grinding the groove of the blank pipe 24; after the butt joint groove gaps of the finished product flange I21, the finished product flange II 26 and the blank pipe 24 meet the requirements, the deviation between the excircle of the blank pipe 24 and the interface excircles of the finished product flange I21 and the finished product flange II 26 is checked by a cutting rule, and the deviation is not more than 0.1 mm; and installing positioning plugs 9 among the finished flange I21, the finished flange II 26 and the blank pipe 24, uniformly distributing eight blocks on the circumference, fixing by spot welding to complete the positioning of the finished flange I21, the finished flange II 26 and the blank pipe 24, and transplanting the measuring point marks and the installation lines on the fixed flange I10 and the fixed flange II 27 to the finished flange I21 and the finished flange II 26.
Backing welding is carried out by adopting manual argon arc welding, two ends cannot be simultaneously carried out, welding is carried out in a circumferential symmetric mode during welding, the welding speed is controlled, the flange welding deformation condition is monitored by using a dial indicator 25, and the welding deformation of the flange is effectively controlled by a welding mode of 'reverse deformation' (reverse deformation welding, namely, when the deformation of a certain position is monitored to be large, the welding is stopped immediately, and the welding is carried out in the circumferential symmetric direction of the position); and manual electric arc welding filling is adopted after argon arc welding bottoming, the welding speed and the inter-lane temperature are controlled, the flange welding deformation is monitored by using a dial indicator 25, and the flange welding deformation is controlled by adopting reverse deformation welding.
Before the pipeline is installed on a ship, compressing the DN650 metal flexible connecting pipe 2 by about 6mm in advance, aligning the installation line on the finished flange II 26 with the installation line of the circulating water pump 1, installing the pipeline in place, installing metal winding gaskets among the finished flange I21, the finished flange II 26, the DN650 metal flexible connecting pipe 2 and the circulating water pump 1 flange, loosening the compressed DN650 metal flexible connecting pipe 2, uniformly tightening the flange by using bolts, and ensuring that the gap deviation of the flange is not more than 0.20 mm; in addition, when the bolt is fastened, the compression amount of the wound gasket can be changed by controlling the fastening torque, the thickness of the wound gasket is 3.2mm, the compression rate is 18-34%, and the compression amount is 0.58-1.09; further adjusting the axial size of the DN650 metal flexible connecting pipe 2; after the DN650 metal flexible adapter 2 is installed, the axial dimension of the DN650 metal flexible adapter 2 is measured by a vernier caliper, which is shown in Table 4.
TABLE 4 DN650 axial dimension (unit: mm) of metal flexible connecting pipe after installation
| 1 | 2 | 3 | 4 | |
| Theoretical value | 822.50±1.5 | 822.50±1.5 | 822.50±1.5 | 822.50±1.5 |
| After installation | 822.98 | 823.16 | 823.06 | 822.66 |
And (4) conclusion:
through the research on the process methods of size adjustment, pipeline sampling, pipeline manufacturing and pipeline installation of the DN650 metal flexible connecting pipe 2, various technical indexes of the DN650 metal flexible connecting pipe 2 after installation meet the requirements of installation and use specifications, and the following conclusion is obtained:
(1) the process method for sampling the pipeline between the circulating water pump 1 and the metal flexible connecting pipe effectively ensures the manufacturing precision of the sample tire pipeline and meets the requirements of site construction.
(2) The process method for manufacturing the pipeline between the circulating water pump 1 and the metal flexible connecting pipe effectively ensures the manufacturing precision of the pipeline and meets the requirements of site construction.
(3) After the DN650 metal flexible connecting pipe 2 is installed, the technical requirements of installation and use specifications of the DN650 metal flexible connecting pipe 2 are met.
Through verification of the whole field construction process, the DN650 metal flexible connecting pipe installation process method proves that the process method has rationality, feasibility and reliability, the construction method is easy to master and convenient to construct, and the tool designed according to construction needs and the welding deformation control method obtained through test verification play a vital role in the pipeline manufacturing precision, so that the installation precision of the metal flexible connecting pipe is ensured.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (3)
1. A DN650 metal flexible connecting pipe installation size control method is characterized in that:
DN650 metal flexible connecting pipe installation process: firstly, adjusting the size of DN650 metal flexible connecting pipe; secondly, sampling by a pipeline, and determining the tire compensation amount; secondly, acquiring post-welding shortening data by a pipeline welding shortening test, and manufacturing a pipeline; finally, pipeline installation is carried out;
when the pipeline is sampled, the welding deformation is controlled by accurately grinding and matching the sample tube and time-sharing welding the two ends of the sample tube, and the axial deformation of the DN650 metal flexible connecting tube before and after the sample tube is welded is measured and used as the compensation quantity when the finished flange is positioned;
the sample tire is fixed on the platform through a fixing tool and is positioned and tightened by a positioning pin, a cushion block and a bolt, so that the positioning precision is improved, and meanwhile, the welding deformation during the sample tube manufacturing is compensated through the thickness of the cushion block; positioning the finished flange by adopting an alignment tool, and considering welding deformation during welding of the fixed flange; obtaining the welding shortening of the pipeline through a pipe welding test; the blank pipe is ground and matched by twice processing, so that the grinding and matching quality of the pipeline is improved; when the finished flange is welded with the pipe, a dial indicator monitoring and 'anti-deformation' welding method is adopted to control the welding deformation of the finished pipe;
when the pipeline is installed, the compression amount of the wound gasket is controlled by fastening the bolts, and the size of the DN650 metal flexible connecting pipe after installation is ensured.
2. The DN650 metal flexible adapter installation size control method according to claim 1, wherein the method comprises the following steps:
when a pipeline is sampled, the gap between the sample pipe and the sample tire flange is controlled by improving the precision of sample pipe bedding-in, so that the welding deformation is effectively controlled; the method that one side of the sample tube is welded firstly and the other side of the sample tube is welded secondly is adopted, so that the welding stress between the sample tube and the sample tire flange is reduced; by measuring the sizes of the DN650 metal flexible connecting pipe before and after pipeline sampling, the axial size change caused by the metal flexible connecting pipe after pipeline sampling and welding is calculated, and the axial size change is used as the compensation quantity for later-stage sample tire manufacturing, so that the manufacturing precision of the finished product pipeline is improved.
3. The DN650 metal flexible adapter installation size control method according to claim 1, wherein the method comprises the following steps:
before the pipeline is manufactured, the same batch of pipes are adopted for welding test to obtain the welding shrinkage of the pipeline, and the shrinkage is reserved during pipeline grinding, so that the length of the pipeline is effectively controlled; after sampling, the pipeline fixes the sample tire on the platform through the fixed blind plate in a welding way, and a positioning pin is arranged to ensure the centering and positioning precision between flanges; after the fixed blind plate is welded, removing a fixed flange at one end of the sample tire to keep the fixed flange in a free state, and measuring the axial deflection and radial deflection of the sample tire flange and the fixed blind plate to obtain the deformation caused by welding of the fixed blind plate, wherein the deformation is used for adjusting and centering monitoring in the later stage of pipeline manufacturing and compensating the positioning deviation caused by welding and fixing the sample tire; before the pipeline is ground and matched, an alignment tool is adopted for adjustment, and finished flanges are positioned according to circumferential deflection and radial offset after the sample tires are welded and fixed; when the pipeline is ground, the allowance of the pipeline is accurately removed through two times of processing; meanwhile, considering the cold shrinkage of welding, reserving the shrinkage obtained in the previous welding test during the research and preparation, and effectively controlling the length of the welded pipeline; the pipeline and the flange are welded and positioned by adopting the positioning chock blocks, the welding deformation is monitored by using the dial indicator during welding, and the welding position is adjusted by welding in a 'reversible deformation' mode, so that the welding deformation is effectively controlled.
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| CN111702376A (en) * | 2020-06-18 | 2020-09-25 | 贵州永红航空机械有限责任公司 | Control method for ensuring multi-interface size after welding of aviation radiator |
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2021
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| CN87100959A (en) * | 1987-02-28 | 1988-09-07 | 航空工业部六二五研究所 | The thin-plate element low stress does not have distortion welding method and device thereof |
| CN102513664A (en) * | 2011-12-29 | 2012-06-27 | 江南造船(集团)有限责任公司 | Actual ship assembly welding process for ultra-large high-precision base |
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| CN109530871A (en) * | 2018-12-21 | 2019-03-29 | 渤海造船厂集团有限公司 | A kind of steam pipework is without surplus assembly method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115848584A (en) * | 2022-11-08 | 2023-03-28 | 沪东中华造船(集团)有限公司 | Method for manufacturing and installing marine large-deformation flexible hose folding pipe |
| CN115848584B (en) * | 2022-11-08 | 2024-06-11 | 沪东中华造船(集团)有限公司 | Manufacturing and installing method of folding pipe of marine flexible hose capable of being deformed greatly |
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| CN113600976B (en) | 2023-07-11 |
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