CN109396762A - The assembly method of marine diesel exhaust gas recirculation device shell - Google Patents
The assembly method of marine diesel exhaust gas recirculation device shell Download PDFInfo
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- CN109396762A CN109396762A CN201811328947.XA CN201811328947A CN109396762A CN 109396762 A CN109396762 A CN 109396762A CN 201811328947 A CN201811328947 A CN 201811328947A CN 109396762 A CN109396762 A CN 109396762A
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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
Abstract
A kind of assembly method of marine diesel exhaust gas recirculation device shell, the device housing is made of air cooler shell and washer shell, including air cooler frame, muti-piece side plate, muti-piece flange, knapsack, muti-piece gusset, more steel pipes, intermediate plate, base plates, the assembly method includes: step 1, marking on slab；Step 2 assembles air cooler shell；Step 3 assembles washer shell；Step 4 closes up assembly；Step 5, base plate assembly.This invention takes the technological measures such as error, the allowance for shrinkage appropriate of control scribing line and installation, it solves the problems, such as since welding deformation is rambunctious caused by more than thin plate, the beneficial effect for having reached raising exhaust gas recirculation device (EGR) shell quality has the advantages that simple process, easy to make, quality assurance.
Description
Technical field
The present invention relates to a kind of manufacturing methods of diesel engine part, and in particular to a kind of marine diesel exhaust gas recycling dress
The assembly method for setting shell belongs to diesel engine manufacturing technology field.
Background technique
Diesel engine has high combustion efficiency, good dynamic property, high reliability, therefore the conduct always in Shipping
Main power device.With the reinforcement of mankind's environmental consciousness, the exhaust gas emission problem of marine diesel has attracted great attention.
Countries in the world and international organization propose stringenter emission regulation one after another.It is marine diesel that exhaust gas, which recycles (EGR) technology,
Reach the important technique measure of new emission regulation, and shell is the carrier of exhaust gas recirculation device, passes through exhaust gas recirculation device
Shell achieve the effect that exhaust gas circulation, conversion, circulation.
Marine diesel exhaust gas recirculation device (EGR) is the best-of-breed technology of current reply emission request, is to use at present
Reduction diesel engine discharged nitrous oxides one of most effective control measure.Referring to Fig. 1, exhaust gas recirculation device (EGR)
Shell is made of air cooler shell 1 and washer shell 2, which is welded in the top of washer shell 2.
The air cooler shell 1 includes upper and bottom section.Fig. 3 is please referred to, the upper part of the air cooler shell 1 includes upper
Left plate 11, upper right side panel 12, flange 13 and upper bent plate 14；The upper left side plate 11 and upper right side panel 12 are respectively perpendicular ground solid welding
In the left and right sides of upper bent plate 14, the flange 13 is welded in the top of bent plate 14；The lower part subpackage of the air cooler shell 1
Air cooler frame 15, muti-piece bent plate 16 and knapsack 17 are included, the air cooler frame 15 and bent plate 16 are connected to the upper bent plate 14
Lower part, the knapsack 17 is welded in the right side of the air cooler frame 15.Fig. 4 is please referred to, the washer shell 2 includes
Lower left plate 21, lower right side plate 22, intermediate bent plate 23, flange 24, cylinder 27, left base plate 25 and right base plate 26, under described
Left plate 21 and lower right side plate 22 are welded in the left and right sides of the intermediate bent plate 23 respectively, are equipped with round flange, method above
The small parts such as orchid, joint chair, the cylinder 27 terminate in lower right side plate 22 from the insertion of lower left plate 21, and the flange 24 is welded in described
On cylinder 27.The left base plate 25 and right base plate 26 are welded in the lower part of lower left plate 21 and lower right side plate 22 respectively.
The air cooler shell 1 and washer shell 2 form the shell of exhaust gas recirculation device (EGR), which follows again
The shell of loop device (EGR) is all made of stainless steel material and is made, and portable construction, welding capacity is few, while reducing assembly difficulty.But
It is that the structure of the exhaust gas recirculation device (EGR) shell generallys use thin plate, and stainless steel material is for welding requirements
Higher, welding deformation is difficult to control, and the difficult point of manufacture is:
1, the case material of exhaust gas recirculation device (EGR) is two phase stainless steel, and thin plate is in the majority, and minimum plate thickness is 3mm,
Welding procedure difficulty is larger, is the key that influence the deformation of overall structure uniform shrinkage.
2, the shell of exhaust gas recirculation device (EGR) is body structure, internal spacious, welding contraction distortion be difficult to it is anticipated that
Strict requirements are proposed to the allowance for shrinkage of welding.
3, grade size is opened in 1600mm between the left plate 21 and right side plate 22 of washer shell 2, it is big to open grade size, two sides
For plate without support, welding contraction is larger, and welding deformation is difficult to control.
4, the shell whole height of exhaust gas recirculation device (EGR) is higher, and top piece installation dimension is difficult to control, for
Whole assembly proposes strict requirements.
5, since each component plate thickness differs greatly, there are biggish welding stresses for structure after processing, to the weld seam antifatigue longevity
Life has large effect.
Summary of the invention
The present invention is directed to the manufacture difficult point of marine diesel exhaust gas recirculation device shell, and it is useless to provide a kind of marine diesel
The assembly method of gas recycling device shell, overcomes that welding difficulty is big, component is easily-deformable, installation accuracy requires high technique difficult
Point improves the welding production quality of marine diesel exhaust gas recirculation device shell.
To achieve the above object, technical scheme is as follows:
A kind of assembly method of marine diesel exhaust gas recirculation device shell, the exhaust gas recirculation device shell is by sky
Cooler shell body and washer shell are constituted, which is welded in the top of washer shell；The air cooler shell packet
Include upper and bottom section, wherein upper part includes upper left side plate, upper right side panel, flange and upper bent plate, upper left side plate and upper right
Side plate is welded in the two sides of bent plate with being respectively perpendicular, and flange is welded in the top of bent plate, lower part point including air cooler frame,
Muti-piece bent plate and knapsack, air cooler frame and bent plate are connected to the lower part of bent plate, and knapsack is welded in the right side of air cooler frame；Institute
Stating washer shell includes lower left plate, lower right side plate, intermediate bent plate, flange, cylinder, left base plate and right base plate, wherein
Lower left plate and lower right side plate are welded in the two sides of intermediate bent plate respectively, and cylinder terminates in lower right side plate, method from the insertion of lower left plate
Orchid is welded on cylinder, and left base plate and right base plate are welded in the lower part of lower left plate and lower right side plate respectively；Its feature exists
In whole assembly works carry out on platform, and specific step is as follows for the assembly method:
Step 1, marking on slab,
1.1, the levelness of verifying bench, guarantee the platform in the range of 6 meters of width, 10 meters of length horizontal gradient error≤
2mm；
1.2, following scribing line: longitudinal centre line, transverse direction is carried out according to the structure of exhaust gas recirculation device shell on platform
Center line, the side plate position line, the upper bent plate position line, intermediate bent plate contour line, frame position line and base plate scribing line, and reach and draw
Line requirement；
Step 2 assembles air cooler shell,
2.1, it installs bent plate: according to the upper bent plate position line on platform, upper bent plate being placed on platform, is then put down this
Cross central line and longitudinal centre line on platform are rejected on upper bent plate；
2.2, left plate and upper right side panel are installed: marking center line, bent plate installation on upper left side plate and upper right side panel
Line is aligned according to the side plate position line on platform with cross central line, deviation≤1mm, upper left side plate and upper right side panel when installation
Bent plate in abutting, local gap are not more than 2mm；
2.3, mounting flange: flange contour line is marked on upper bent plate, and is cut on upper bent plate according to the flange contour line
Flange is inserted into the flange mounting hole by flange mounting hole out, and control flange angle and height dimension, deviation≤1mm, installation
Bent plate in Shi Falan abutting, local gap are not more than 2mm；
2.4, air cooler frame is installed: according to the frame position line on platform, four steel being laid on platform, and is added
Square box is formed with fixation, the position line of four vertical steel and solid welding are marked on square box, then by four root steel shapes
At square box be welded in top, four pieces of bent plates are finally welded in the front and rear sides of air cooler frame, all steel installations are inclined
Difference≤1mm；
Step 3 assembles washer shell,
3.1, lower left plate is installed: according to the side plate position line on platform, two blocks of side plates being placed on the platform, then
Longitudinal centre line, cross central line on the platform is rejected on lower left plate；
3.2, intermediate bent plate is installed: center line, bent plate hookup wire are marked on lower left plate, according to curved on lower left plate
Plate scribing position is stood on intermediate bent plate on lower left plate and solid welding, dimensional discrepancy≤2mm, and when installation is close to lower left plate, office
Portion gap is not more than 2mm；
3.3, lower right side plate is installed: being crossed by lower right cover with side on intermediate bent plate according to the bent plate on lower right side plate, and
And " hanging method " is utilized to guarantee that the center line of lower left plate is aligned with the center line of lower right side plate, and deviation≤1mm, lower right when installation
Side plate is close to intermediate bent plate, and local gap is not more than 2mm；
3.4, small part assembles: according to the scribing line mounting flange and pipe on lower left plate, lower right side plate and intermediate bent plate,
Centerline deviation≤1mm；
Step 4 closes up assembly,
4.1, air cooler shell and washer shell to the layout line, are closed up into assembly, air cooler shell is placed in washer shell
On body, horizontal departure is not more than 2mm；
4.2, in identical platform, lower left plate and lower right side plate is corrected, is allowed to vertical with platform；
Step 5, base plate assembly,
According to the base plate scribing line on platform, left base plate and right base plate are placed on the platform, in left pedestal
The hookup wire that the lower left plate and lower right side plate are marked on plate and right base plate by the air cooler shell closed up after assembling and is washed
It washs device shell to be placed on left base plate and right base plate, and solid welding.
Further, scribing line described in the step 1.2 requires to refer to,
A, institute's own centre line scale error≤0.5mm；
B, each position linear dimension error≤1mm；
C, it opens a grade size and places 1.5mm allowance for shrinkage.
Further, in the step 2.4, often the air cooler frame is turned in welding process, and
Intermediate setting support when necessary, to reduce welding deformation；Gouge back chipping is needed when the air cooler frame welding.
Further, the gouge back chipping refers to method that root of weld gas is melted and blown down by ontology
Lack of penetration and slag inclusion defect expressivity.
Further, " hanging method " described in the step 3.3 refers to, using the hanging from top to bottom of taper weight, protects
Card locates method on the same line up and down.
The assembly method of marine diesel exhaust gas recirculation device shell of the present invention takes control scribing line and installation
The technological measures such as error, allowance for shrinkage appropriate, reversible deformation, the effect of EGR shell quality requirement is met, with the prior art
It compares, becomes the beneficial effects of the present invention are: solving exhaust gas recirculation device (EGR) shell due to welding caused by more than thin plate
Shape problem rambunctious completes the whole assembling work of EGR shell by the method that sub-unit makes, have simple process,
The advantages of easy to make, quality assurance.
Detailed description of the invention
Fig. 1 is the housing assembly stereoscopic schematic diagram of exhaust gas recirculation device.
Fig. 2 is that marking on slab figure is divided in air cooler upper part of the housing.
Fig. 3 is that marking on slab figure is divided in air cooler lower part of the housing.
Fig. 4 is washer shell deck scribing line figure.
Fig. 5 is the side view of air cooler shell.
Fig. 6 is the side view of washer shell.
In figure:
1- air cooler shell, 2- washer shell, 11- upper left side plate, 12- upper right side panel, 13- flange, the upper bent plate of 14-,
15- air cooler frame, 16- bent plate, 17- knapsack, left plate under 21-, right side plate under 22-, bent plate among 23-, 24- flange, 25-
Left base plate, the right base plate of 26-, 27- cylinder, the L11- side plate position line, the L12- side plate position line, the L21- side plate position line,
The L22- side plate position line, the scribing line of L25- base plate, the scribing line of L26- base plate, X- cross central line, Y- longitudinal centre line.
Specific embodiment
The present invention is further elaborated with specific embodiment with reference to the accompanying drawing, but cannot be used as a limitation the present invention
Protection scope.
The present invention provides a kind of technique assembly method, to manufacture the shell of marine diesel exhaust gas recirculation device (EGR)
Body.Referring to Fig. 1, exhaust gas recirculation device (EGR) shell is made of air cooler shell 1 and washer shell 2.Institute
Stating air cooler shell 1 includes upper and bottom section, and the air cooler upper part of the housing point includes upper left side plate 11, upper right side panel
12, flange 13 and upper bent plate 14, the upper left side plate 11, upper right side panel 12 are vertically welded in 14 two sides of bent plate, the flange
13 are welded on bent plate 14；The air cooler lower part of the housing point includes air cooler frame 15, knapsack 17 and muti-piece bent plate 16,
Knapsack 17 is welded in 15 side of air cooler frame, please refers to Fig. 5；The washer shell 2 includes lower left plate 21, lower right side
Plate 22, intermediate bent plate 23, flange 24 and cylinder 27, other small parts such as round flange, square flange, joint chair etc. are mounted on institute in advance
It states on lower left plate 21 and lower right side plate 22, the lower left plate 21 and lower right side plate 22 are welded in 23 liang of intermediate bent plate respectively
Side, the cylinder 27 terminate in lower right side plate 22 from the insertion of lower left plate 21, and the flange 24 is welded on cylinder 27, incorporated by reference to ginseng
Read Fig. 6.The left base plate 25 and right base plate 26 are welded in respectively under washer shell upper left side plate 21 and upper right side panel 22
Portion.The air cooler shell 1 and washer shell 2 form the exhaust gas recirculation device (EGR) shell, please refer to Fig. 1.
Below by way of the assembly of an embodiment the present invention will be described in detail the marine diesel exhaust gas recirculation device shell
Method, in the present embodiment, specific step is as follows for the production method:
Step 1, marking on slab,
1.1, whole assembly productions work of marine diesel exhaust gas recirculation device (EGR) shell is used flat in assembly
It is carried out on platform, and the levelness of the platform will directly affect the verticality and machining allowance of part, therefore first have to examine before crossing
The levelness for testing platform guarantees platform horizontal gradient error≤2mm in the range of 6 meters of width, 10 meters of length.
1.2, on the platform to air cooler shell 1 and washer shell 2 carry out upper left side plate 11, upper right side panel 12,
Lower left plate 21, lower right side plate 22, upper bent plate 14, the intermediate each component of bent plate 23 are crossed, and please refer to Fig. 2, Fig. 3 and Fig. 4: horizontal
To center line X, longitudinal centre line Y, the side plate position line L11, L12, L21 and L22, the upper bent plate position line, intermediate bent plate contour line,
Frame position line, base plate scribing line L25, L26；Scribing line should reach following size requirement:
A, scale error≤0.5mm of institute's own centre line,
B, each position linear dimension error≤1mm,
C, according to the experience of diesel air cooler erection welding and the research to EGR drawing, for ensure postwelding because welding,
The factors such as firework correction and caused by contraction distortion, respectively open the allowance for shrinkage that shelves place 1mm.
Step 2 assembles air cooler shell 1, sees Fig. 5.
2.1, it installs bent plate 14: according to the upper bent plate position line L14 on platform, upper bent plate 14 being placed in the platform
On, then whole scribing line on the platform are rejected on upper bent plate 14, i.e., are crossed again on upper bent plate 14, content of crossing and position
Set it is consistent with the whole scribing line on platform, all scribing line include: longitudinal centre line Y, cross central line X.
2.2, left plate 11, upper right side panel 12 are installed: marking center line, bent plate hookup wire on upper left side plate 11, presses
It according to the side plate position line L11 and L12 on platform, is aligned with bent plate cross central line X, deviation≤1mm, upper left side plate 11 when installation
Bent plate 14 in abutting, local gap are not more than 2mm, and it is exceeded to will cause out grade size because gap is excessive, cause to weld after-contraction and become
Shape is excessive.
2.3, mounting flange 13: flange contour line is marked on upper bent plate 14, and cuts out flange installation according to the contour line
Flange is inserted into the mounting hole by hole, and control flange angle and height dimension, deviation≤1mm, on flange 13 is close to when installation
Bent plate 14, local gap are not more than 2mm.
2.4, air cooler frame 15 is installed: according to frame position line, the crossbeam center line X, longitudinal centre line Y on platform,
Four steel are laid on platform, and is fixed and to form square box, the position of four vertical steel is marked on square box
Four pieces of bent plates 16 are finally installed on frame two by line and solid welding, the square box solid welding for then forming four root steel and top
Side, all steel installation deviation≤1mm.
2.5, the air cooler shell 1 that each component is dressed up is welded: big, the welding of opening shelves between side plate, between air cooler frame
When pay attention to welding deformation, it is necessary to when among settable support；It often turns in welding process to reduce welding deformation.Air cooler
Frame 15 is required to gouge back chipping when welding；Gouge back chipping refers to the method that root of weld gas is melted and blown down, can
The defects of the lack of penetration of our department, slag inclusion, to be eliminated.
Step 3 assembles washer shell, sees Fig. 6.
3.1, lower left plate 21 is installed: according to the side plate position line on platform, two blocks of side plates being placed on the platform, so
Longitudinal centre line Y, the cross central line X on the platform are rejected on lower left plate 21 afterwards.
3.2, intermediate bent plate 23 is installed: center line, bent plate hookup wire are marked on lower left plate 21, according to lower left plate 21
On bent plate scribing position, intermediate bent plate 23 is stood on lower left plate 21 and solid welding, dimensional discrepancy≤2mm, when installation is close to
Lower left plate 21, local gap are not more than 2mm.
3.3, lower right side plate 22 is installed: crossing according to the bent plate on lower right side plate 22 and covers lower right side plate 22 in intermediate bent plate
On 23, and " hanging method " is utilized to guarantee that the center line of lower left plate 21 is aligned with the center line of lower right side plate 22, deviation≤
1mm, right side plate 22 is close to intermediate bent plate 23 at present for installation, and local gap is not more than 2mm；" the hanging method " refers to, utilizes
The hanging from top to bottom of taper weight guarantees the method for place on the same line up and down, this is a kind of in boat diesel engine manufacture
More universal method meets the required precision of diesel engine manufacture.
3.4, it pipe, small part assembly: is installed according to the scribing line on lower left plate 21, lower right side plate 22, intermediate bent plate 23
Flange, pipe, etc. small parts, centerline deviation≤1mm.
3.5, weld the washer shell 2 that each component is dressed up: washer shell 2 is body structure, internal spacious, when welding
Pay attention to contraction distortion, it is necessary to when bracing reinforcement is set, guarantee to open shelves between both side plate.
Step 4 closes up assembly, sees Fig. 1.
4.1, air cooler shell 1 and washer shell 2 are closed up into assembly, air cooler shell 1 be placed in washer shell 2 it
On, center alignment, horizontal departure is not more than 2mm.
4.2, in identical platform, lower left plate 21 is corrected with lower right side plate 22 and is allowed to vertical with platform.
4.3, pay attention to the height dimension after air cooler shell 1 and washer shell 2 close up, place welding appropriate in advance and receive
Contracting surplus guarantees that welding is contracted in controlled range.
Step 5, base plate assembly,
According to base plate scribing line L25, L26 on platform, left base plate 25, right base plate 26 are placed in the platform
On, hookup wire L21, L22 of 2 both side plate of washer shell are marked on left base plate 25 and right base plate 26, will be closed up
Air cooler shell 1 and washer shell 2 after assembly are placed on left base plate 25 and right base plate 26, and solid welding.Two base plates it
Between open grade size no more than 3mm；Base plate flange is paid attention to when welding, it is necessary to when installation reversible deformation control.
Unquestionably, present invention is obviously not limited to the details of above-mentioned exemplary embodiment, and the marine diesel exhaust gas is again
The assembly method of circulator shell is not limited to the parameter values mentioned in above-described embodiment, should also include other techniques
Parameter selection；To sum up, the present invention claims protection scope should also include those be aobvious to those skilled in the art
And the transformation and substitution being clear to.
Claims (5)
1. a kind of assembly method of marine diesel exhaust gas recirculation device shell, the exhaust gas recirculation device shell is by air-cooled
Device shell and washer shell are constituted, which is welded in the top of washer shell；The air cooler shell includes
Upper and bottom section, wherein upper part includes upper left side plate, upper right side panel, flange and upper bent plate, upper left side plate and upper right side
Plate is welded in the two sides of bent plate with being respectively perpendicular, and flange is welded in the top of bent plate, and it includes air cooler frame that lower part, which is divided, more
Block bent plate and knapsack, air cooler frame and bent plate are connected to the lower part of bent plate, and knapsack is welded in the right side of air cooler frame；It is described
Washer shell includes lower left plate, lower right side plate, intermediate bent plate, flange, cylinder, left base plate and right base plate, wherein under
Left plate and lower right side plate are welded in the two sides of intermediate bent plate respectively, and cylinder terminates in lower right side plate, flange from the insertion of lower left plate
It is welded on cylinder, left base plate and right base plate are welded in the lower part of lower left plate and lower right side plate respectively；It is characterized in that,
Whole assembly works carry out on platform, and specific step is as follows for the assembly method:
Step 1, marking on slab,
1.1, the levelness of verifying bench guarantees platform horizontal gradient error≤2mm in the range of 6 meters of width, 10 meters of length；
1.2, following scribing line: longitudinal centre line, transverse center is carried out according to the structure of exhaust gas recirculation device shell on platform
Line, the side plate position line, the upper bent plate position line, intermediate bent plate contour line, frame position line and base plate scribing line, and reach scribing line and want
It asks；
Step 2 assembles air cooler shell,
2.1, it installs bent plate: according to the upper bent plate position line on platform, upper bent plate being placed on platform, it then will be on the platform
Cross central line and longitudinal centre line reject on upper bent plate；
2.2, left plate and upper right side panel are installed: marking center line, bent plate hookup wire on upper left side plate and upper right side panel, presses
It according to the side plate position line on platform, is aligned with cross central line, deviation≤1mm, upper left side plate and upper right side panel are close to when installation
Upper bent plate, local gap are not more than 2mm；
2.3, mounting flange: marking flange contour line on upper bent plate, and according to the flange contour line on upper bent plate the method for cutting out
Flange is inserted into the flange mounting hole by blue mounting hole, and control flange angle and height dimension, deviation≤1mm, method when installation
Orchid is close to upper bent plate, and local gap is not more than 2mm；
2.4, air cooler frame is installed: according to the frame position line on platform, four steel being laid on platform, and are consolidated
It is shaped as square box, the position line of four vertical steel and solid welding are marked on square box, then forms four root steel
Square box is welded in top, and four pieces of bent plates are finally welded in the front and rear sides of air cooler frame, and all steel installation deviations≤
1mm；
Step 3 assembles washer shell,
3.1, lower left plate is installed: according to the side plate position line on platform, two blocks of side plates being placed on the platform, then should
Longitudinal centre line, cross central line on platform are rejected on lower left plate；
3.2, intermediate bent plate is installed: marking center line, bent plate hookup wire on lower left plate, is drawn according to the bent plate on lower left plate
Line position stands on intermediate bent plate on lower left plate and solid welding, dimensional discrepancy≤2mm, and when installation is close to lower left plate, between part
Gap is not more than 2mm；
3.3, lower right side plate is installed: being crossed by lower right cover with side on intermediate bent plate according to the bent plate on lower right side plate, and benefit
Guarantee that the center line of lower left plate is aligned with the center line of lower right side plate with " hanging method ", deviation≤1mm installs right side plate at present
It is close to intermediate bent plate, local gap is not more than 2mm；
3.4, small part assembles: according to the scribing line mounting flange and pipe on lower left plate, lower right side plate and intermediate bent plate, center
Line deviation≤1mm；
Step 4 closes up assembly,
4.1, air cooler shell and washer shell to the layout line, are closed up into assembly, air cooler shell be placed in washer shell it
On, horizontal departure is not more than 2mm；
4.2, in identical platform, lower left plate and lower right side plate is corrected, is allowed to vertical with platform；
Step 5, base plate assembly,
According to the base plate scribing line on platform, left base plate and right base plate are placed on the platform, in left base plate and
The hookup wire that the lower left plate and lower right side plate are marked on right base plate will close up air cooler shell and washer after assembling
Shell is placed on left base plate and right base plate, and solid welding.
2. the assembly method of marine diesel exhaust gas recirculation device shell according to claim 1, which is characterized in that institute
Scribing line requirement described in the step 1.2 stated refers to,
A, institute's own centre line scale error≤0.5mm；
B, each position linear dimension error≤1mm；
C, it opens a grade size and places 1.5mm allowance for shrinkage.
3. the assembly method of marine diesel exhaust gas recirculation device shell according to claim 1, which is characterized in that institute
In the step 2.4 stated, often the air cooler frame is turned in welding process, and intermediate setting support if necessary,
To reduce welding deformation；Gouge back chipping is needed when the air cooler frame welding.
4. the assembly method of marine diesel exhaust gas recirculation device shell according to claim 3, which is characterized in that institute
The gouge back chipping stated refers to the method that root of weld gas is melted and blown down by ontology is lack of penetration and the defect of slag inclusion disappears
It removes.
5. the assembly method of marine diesel exhaust gas recirculation device shell according to claim 1, which is characterized in that institute
" hanging method " described in the step 3.3 stated refers to, using the hanging from top to bottom of taper weight, guarantees that place is on the same line up and down
Method.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111660071A (en) * | 2020-06-30 | 2020-09-15 | 湛江德利车辆部件有限公司 | Processing technology of EGR (exhaust gas recirculation) flange |
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