CN108581395B - Process method for assembling and welding diffuser pipe in marine diesel engine - Google Patents
Process method for assembling and welding diffuser pipe in marine diesel engine Download PDFInfo
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- CN108581395B CN108581395B CN201810628838.3A CN201810628838A CN108581395B CN 108581395 B CN108581395 B CN 108581395B CN 201810628838 A CN201810628838 A CN 201810628838A CN 108581395 B CN108581395 B CN 108581395B
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- welding
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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
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
Abstract
The invention discloses a process method for assembling and welding a diffuser pipe in a marine diesel engine, which is characterized in that a positioning rib is used for replacing a taper pipe of the diffuser pipe to adapt the relative positions of a top flange and a bottom flange in the diffuser pipe, so that the problem that the taper pipe in the diffuser pipe is slow in arrival during assembling and preassembling is solved, and normal assembling of a host is ensured; on the other hand, the field welding of the diffuser pipe is changed into the welding in a steel structure factory by using the positioning ribs, so that the limitation of the operation space and the operation position during the welding of the diffuser pipe is changed, and the problem of large deformation of welding is solved; meanwhile, the process of detecting the flatness after welding is added in the process, and a milling surface is processed, so that the problem that the assembly flatness has errors is solved; meanwhile, the expansion joint is arranged on the turbocharger and has the expansion amount of 3mm, so that the assembly is not influenced by proper milling.
Description
Technical Field
The invention relates to the technical field of marine diesel engines, in particular to a process method for assembling and welding diffuser pipes in a marine diesel engine.
Background
The diffuser pipe is used for connecting the scavenging air box and the turbocharger in the marine diesel engine, and mainly comprises three workpieces: a top flange 01, a conical pipe 02 and a bottom flange 03, the structure of which is shown in figures 1-2. Due to the accumulated errors of welding, machining and assembling of the scavenging box and the like, the diffuser pipe needs to be subjected to on-site assembly welding during assembling, namely the on-site assembly welding step of the diffuser pipe is performed in the pre-assembling process of assembling, after the diffuser pipe is shipped, each workpiece of the diffuser pipe is positioned in the pre-assembling process, and then the top flange 01, the conical pipe 02 and the bottom flange 03 are welded on the site in the pre-assembling process.
When the diffuser pipe is welded, the inner side and the outer side of the two flanges are required to be welded, the welding site is limited by the operation space and the operation position, and the top flange and the bottom flange are easy to deform after welding, so that the marine diesel engine is easy to generate air leakage faults at the joint of the top flange 01 and the conical pipe 02 and the joint of the bottom flange 03 and the conical pipe 02 when the whole marine diesel engine runs, and dust can be sucked into the turbocharger due to air leakage, so that the turbocharger is damaged. Meanwhile, the taper pipe 02 of the diffuser pipe needs to be produced outside, so that the phenomenon of slow arrival frequently occurs, and the assembly of equipment is influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a process method for assembling and welding diffuser pipes in a marine diesel engine.
In order to achieve the purpose, the invention adopts the following technical scheme: a process method for assembling and welding diffuser pipes in marine diesel engines comprises the following steps:
the method comprises the following steps: preassembling and assembling the scavenging box and the turbocharger in place;
step two: preassembling a top flange of the diffuser pipe and the turbocharger to position the top flange, preassembling a bottom flange of the diffuser pipe and the scavenging box to position the bottom flange, wherein an expansion joint is arranged at the joint of the turbocharger and the top flange;
step three: welding the outer edges of the top flange and the bottom flange by adopting a plurality of positioning ribs to finish the adaptive connection of the top flange and the bottom flange in the diffuser pipe;
step four: the top flange and the bottom flange which are well adapted are disassembled from the scavenging box and the turbocharger and transferred to a steel structure workshop of a steel structure factory to wait for welding with the taper pipe;
step five: one end of the taper pipe with the small diameter penetrates into the bottom flange which is well adapted from the bottom of the bottom flange upwards, so that the end of the taper pipe with the small diameter is matched with the inner side surface of the top flange, and the end of the taper pipe with the large diameter is matched with the inner side surface of the bottom flange;
step six: respectively welding and connecting the matched top flange and the conical pipe, and the matched bottom flange and the conical pipe;
step seven: removing the positioning ribs connected with the top flange and the bottom flange and removing welding spatters on the surfaces;
step eight: milling the end surfaces of the top flange and the bottom flange;
step nine: measuring the planeness of the top flange and the bottom flange by adopting a horizontal ruler, wherein the planeness is regarded as qualified within 1mm, performing the step ten, and turning to the step eight when the planeness is greater than 1 mm;
step ten: paint repair is carried out on the welded diffuser pipe, and heat insulation cotton is installed;
step eleven: and (4) assembling the diffuser pipe, the pre-assembled scavenging box and the turbocharger in a complete machine.
Preferably, in the second step, the top flange and the turbocharger are preassembled through bolts, and the bottom flange and the scavenging air box are preassembled through bolts.
Preferably, in the third step, the number of the positioning ribs is four.
Preferably, the positioning ribs are made of square steel, round tubes or angle steel.
Preferably, in the sixth step, flame drying is performed before the top flange and the conical pipe, and before the bottom flange and the conical pipe are welded.
Preferably, in the sixth step, the top flange and the taper pipe, and the bottom flange and the taper pipe are welded by carbon dioxide arc welding.
Preferably, in the sixth step, the flux-cored wire adopted for welding the top flange and the conical tube and the bottom flange and the conical tube is AWS A5.20E71T-1 in model, and the diameter of the flux-cored wire is equal to that of the flux-cored wire
Preferably, in the sixth step, the top flange and the taper pipe, and the bottom flange and the taper pipe are all fillet welded.
Preferably, in the sixth step, the welding current when the top flange and the taper pipe are welded, and the welding voltage is 28-32V, and the welding speed is 29-35 cm/min.
Preferably, in the eleventh step, the expansion joint has a 3mm expansion amount.
The invention has the following beneficial effects:
(1) according to the process method for assembling and welding the diffuser pipe in the marine diesel engine, the positioning ribs are used for replacing the taper pipe of the diffuser pipe to adapt the relative positions of the top flange and the bottom flange in the diffuser pipe, so that the problem that the taper pipe in the diffuser pipe is slow in arrival during assembling and preassembling is solved, and normal assembling of a host is guaranteed; on the other hand, the field welding of the diffuser pipe is changed into the welding of a steel structure factory by using the positioning ribs, so that the limitation of the operation space and the operation position during the welding of the diffuser pipe is changed, and the problem of large deformation of welding is solved.
(2) According to the technical method for assembling and welding the diffuser pipe in the marine diesel engine, the process of detecting the flatness after welding is added, and the milled surface is processed, so that the problem that the assembling flatness has errors is solved; meanwhile, when the turbocharger is preassembled with a top flange of the diffuser pipe, an expansion joint is installed firstly, and the expansion joint has 3mm of expansion amount, so that the assembly is not influenced by proper face milling.
Drawings
FIG. 1 is a schematic front view of a diffuser pipe construction;
FIG. 2 is a schematic left side view of the diffuser pipe construction;
FIG. 3 is a schematic view of the fitting structure of the positioning rib with the top flange and the bottom flange;
FIG. 4 is a schematic view of the assembly process of the top flange, the bottom flange and the cone of the present invention;
FIG. 5 is a schematic view of the assembly of the top flange, bottom flange, locating ribs and cone of the present invention;
FIG. 6 is a schematic front view of the assembled diffuser pipe, scavenging air box and turbocharger of the present invention;
FIG. 7 is a schematic left side view of the assembled diffuser pipe, scavenging air box and turbocharger of the present invention;
wherein, the pressure expansion pipe is 0 part, the top flange is 01 part, the taper pipe is 02 part, the bottom flange is 03 part, the turbocharger is 04 part, and the scavenging box is 05 part;
1-positioning rib and 2-expansion joint.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
A process method for assembling and welding diffuser pipes in marine diesel engines comprises the following steps:
the method comprises the following steps: preassembling and assembling the scavenging box 05 and the turbocharger 04 in place;
step two: preassembling a top flange 01 of a diffuser pipe 0 and a turbocharger 04 to position the top flange 01, preassembling a bottom flange 03 of the diffuser pipe 0 and a scavenging box 05 to position the bottom flange 03, wherein an expansion joint 2 is arranged at the joint of the turbocharger 04 and the top flange 01;
step three: welding the outer edges of the top flange 01 and the bottom flange 03 by adopting a plurality of positioning ribs 1, and finishing the adaptive connection of the top flange 01 and the bottom flange 03 in the diffuser pipe 0 as shown in figure 3;
step four: the top flange 01 and the bottom flange 03 which are well adapted are detached from the scavenging box 05 and the turbocharger 04 and transferred to a steel structure workshop of a steel structure factory to wait for welding with the taper pipe 02;
step five: as shown in fig. 4, the end with the small diameter of the taper pipe 02 is inserted into the bottom flange 03 from the bottom of the bottom flange 03, so that the end with the small diameter of the taper pipe 02 is matched with the inner side surface of the top flange 01, and the end with the large diameter of the taper pipe 02 is matched with the inner side surface of the bottom flange 03, as shown in fig. 5;
step six: respectively welding and connecting the matched top flange 01 and the taper pipe 02, and the matched bottom flange 03 and the taper pipe 02;
step seven: removing the positioning ribs 1 connected on the top flange 01 and the bottom flange 03 and removing welding spatters on the surfaces;
step eight: milling the end surfaces of the top flange 01 and the bottom flange 03;
step nine: measuring the planeness of the top flange 01 and the bottom flange 03 by adopting a horizontal ruler, wherein the planeness is regarded as qualified within 1mm, performing the step ten, and turning to the step eight when the planeness is larger than 1 mm; thereby solving the problem of error in assembly flatness
Step ten: paint repair is carried out on the welded diffuser pipe 0, and heat insulation cotton is installed;
step eleven: assembling the diffuser pipe 0, the pre-assembled scavenging air box 05 and the turbocharger 04 in a whole machine; the diffuser pipe after being assembled with the complete machine is shown in fig. 6-7.
Preferably, in the second step, the top flange 01 and the turbocharger 04 are preassembled through bolts, and the bottom flange 03 and the scavenging air box 05 are preassembled through bolts.
Preferably, in the third step, the number of the positioning ribs 1 is four.
Preferably, the positioning rib 1 is made of square steel, round tubes or angle steel.
Preferably, in the sixth step, flame drying is performed before the top flange 01 and the taper pipe 02 and before the bottom flange 03 and the taper pipe 02 are welded.
Preferably, in the sixth step, the top flange 01 and the taper pipe 02, and the bottom flange 03 and the taper pipe 03 are welded by carbon dioxide arc welding.
Preferably, in the sixth step, the flux-cored wire adopted for welding the top flange 01 and the taper pipe 02 and the bottom flange 03 and the taper pipe 03 has the model AWS A5.20E71T-1 and the diameter of the flux-cored wire
Preferably, in the sixth step, the top flange 01 and the taper pipe 02, and the bottom flange 03 and the taper pipe 02 are all fillet welded.
Preferably, in the sixth step, the welding current when the top flange 01 and the taper pipe 02 and the bottom flange 03 and the taper pipe 02 are welded is 210-260A, the welding voltage is 28-32V, and the welding speed is 29-35 cm/min.
Preferably, in the eleventh step, the expansion joint 2 has a 3mm expansion amount, so that proper surface milling does not affect assembly.
According to the process method for assembling and welding the diffuser pipe in the marine diesel engine, the positioning ribs 1 are used for replacing the conical pipes 02 of the diffuser pipe 0 to adapt the relative positions of the top flange 01 and the bottom flange 03 in the diffuser pipe 0, so that the problem that the conical pipes 02 in the diffuser pipe 0 are slow in arrival during assembling and preassembling is solved, and normal assembling of a host is guaranteed; on the other hand, the field welding of the diffuser pipe 0 is changed into the welding of a steel structure factory by using the positioning ribs 1, so that the limitation of the operation space and the operation position during the welding of the diffuser pipe 0 is changed, and the problem of large welding deformation is solved.
In the description of the present invention, it is to be understood that the terms "bottom" and the like are based on the orientations and positional relationships shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the present invention, and it should be understood by those skilled in the art that various modifications and changes may be made without inventive efforts based on the technical solutions of the present invention.
Claims (10)
1. A technical method for assembling and welding diffuser pipes in marine diesel engines is characterized by comprising the following steps:
the method comprises the following steps: preassembling and assembling the scavenging box and the turbocharger in place;
step two: preassembling a top flange of the diffuser pipe and the turbocharger to position the top flange, preassembling a bottom flange of the diffuser pipe and the scavenging box to position the bottom flange, wherein an expansion joint is arranged at the joint of the turbocharger and the top flange;
step three: welding the outer edges of the top flange and the bottom flange by adopting a plurality of positioning ribs to finish the adaptive connection of the top flange and the bottom flange in the diffuser pipe;
step four: the top flange and the bottom flange which are well adapted are disassembled from the scavenging box and the turbocharger and transferred to a steel structure workshop of a steel structure factory to wait for welding with the taper pipe;
step five: one end of the taper pipe with the small diameter penetrates into the bottom flange which is well adapted from the bottom of the bottom flange upwards, so that the end of the taper pipe with the small diameter is matched with the inner side surface of the top flange, and the end of the taper pipe with the large diameter is matched with the inner side surface of the bottom flange;
step six: respectively welding and connecting the matched top flange and the conical pipe, and the matched bottom flange and the conical pipe;
step seven: removing the positioning ribs connected with the top flange and the bottom flange and removing welding spatters on the surfaces;
step eight: milling the end surfaces of the top flange and the bottom flange;
step nine: measuring the planeness of the top flange and the bottom flange by adopting a horizontal ruler, wherein the planeness is regarded as qualified within 1mm, performing the step ten, and turning to the step eight when the planeness is greater than 1 mm;
step ten: paint repair is carried out on the welded diffuser pipe, and heat insulation cotton is installed;
step eleven: and (4) assembling the diffuser pipe, the pre-assembled scavenging box and the turbocharger in a complete machine.
2. The process for welding the diffuser pipe in the marine diesel engine according to claim 1, wherein in the second step, the top flange and the turbocharger are preassembled through bolts, and the bottom flange and the scavenging air box are preassembled through bolts.
3. The process for assembling and welding the diffuser pipe in the marine diesel engine according to claim 1, wherein in the third step, the number of the positioning ribs is four.
4. The process for assembling and welding the diffuser pipe in the marine diesel engine according to claim 1, wherein the positioning rib is made of square steel, round steel or angle steel.
5. The process for assembly welding of diffuser pipes in marine diesel engines as set forth in claim 1, wherein in the sixth step, flame drying is performed before the top flange and the conical pipe and before the bottom flange and the conical pipe are welded.
6. The process for assembly welding of diffuser pipes in marine diesel engines according to claim 1, wherein in the sixth step, the top flange and the conical pipe, and the bottom flange and the conical pipe are welded by carbon dioxide arc welding.
7. The process method for assembly welding of the diffuser pipe in the marine diesel engine according to claim 1, wherein in the sixth step, the flux-cored wire used for welding the top flange and the conical pipe and the bottom flange and the conical pipe is AWS A5.20E71T-1, and the diameter of the flux-cored wire is equal to that of the flux-cored wire
8. The process for assembly welding of diffuser pipes in marine diesel engines according to claim 1, wherein in the sixth step, the top flange and the conical pipe, and the bottom flange and the conical pipe are fillet welded.
9. The process method for assembling and welding the diffuser pipe in the marine diesel engine according to claim 1, wherein in the sixth step, the welding current for welding the top flange and the conical pipe and the welding current for welding the bottom flange and the conical pipe are 210 to 260A, the welding voltage is 28 to 32V, and the welding speed is 29 to 35 cm/min.
10. The process for welding a diffuser pipe in a marine diesel engine according to claim 1, wherein in the eleventh step, the expansion joint has a 3mm expansion amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810628838.3A CN108581395B (en) | 2018-06-19 | 2018-06-19 | Process method for assembling and welding diffuser pipe in marine diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810628838.3A CN108581395B (en) | 2018-06-19 | 2018-06-19 | Process method for assembling and welding diffuser pipe in marine diesel engine |
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| Publication Number | Publication Date |
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| CN108581395A CN108581395A (en) | 2018-09-28 |
| CN108581395B true CN108581395B (en) | 2020-02-14 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110091092B (en) * | 2019-06-17 | 2020-12-22 | 中国船舶重工集团柴油机有限公司 | Assembly welding method for upper cross beam of press |
| CN112692482B (en) * | 2020-11-29 | 2022-12-27 | 中船海洋动力部件有限公司 | Positioning and mounting method for air branch pipe of scavenging header supercharger |
| CN113369807B (en) * | 2021-05-27 | 2024-03-29 | 凌云(宜昌)航空装备工程有限公司 | Manufacturing and repairing method and manufacturing and repairing device for metal conduit in aircraft maintenance process |
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| CN106224503A (en) * | 2016-08-24 | 2016-12-14 | 常州澳德森江浪减速机有限公司 | High strength type cycloidal planetary gear speed reducer frame |
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2018
- 2018-06-19 CN CN201810628838.3A patent/CN108581395B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004039006A1 (en) * | 2004-08-11 | 2006-02-23 | Bayerische Motoren Werke Ag | Procedure for welding an end of tail pipe of vehicle exhaust system with flange plate involves welding by carbon dioxide laser welding jig and welding rod positioned at joint |
| CN201635463U (en) * | 2010-03-09 | 2010-11-17 | 江苏方盛电力通信工程有限公司 | Round tower body single-tube communication tower provided with alternating-force resistant structure |
| CN201714724U (en) * | 2010-08-20 | 2011-01-19 | 杭州隆达真空设备有限公司 | Diffusing pipe used on ejector with high suction specific speed |
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| CN108581395A (en) | 2018-09-28 |
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Address after: 266520 No. 501 Lijiang East Road, Huangdao District, Qingdao, Shandong Patentee after: China Shipbuilding Industry Corporation Diesel ENGINE Co.,Ltd. Address before: 266520 No. 501 Lijiang East Road, Huangdao District, Qingdao, Shandong Patentee before: CHINA SHIPBUILDING INDUSTRY CORPORATION DIESEL ENGINE Co.,Ltd. |