CN111168315A - Single-piece welding method for low-speed diesel engine frame for ship - Google Patents
Single-piece welding method for low-speed diesel engine frame for ship Download PDFInfo
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- CN111168315A CN111168315A CN202010119376.XA CN202010119376A CN111168315A CN 111168315 A CN111168315 A CN 111168315A CN 202010119376 A CN202010119376 A CN 202010119376A CN 111168315 A CN111168315 A CN 111168315A
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- Prior art keywords
- welding
- plate
- guide rail
- diesel engine
- wing
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/047—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work moving work to adjust its position between soldering, welding or cutting steps
Abstract
The invention aims to provide a novel welding method for a single piece of a frame of a low-speed diesel engine for a ship, which optimizes the assembly welding sequence according to the layout of welding parts and welding seams of the single piece of the frame of the low-speed diesel engine for the ship and the quality requirement. The invention changes the mode that the web plate and the guide rail plate are firstly assembled and welded and then the wing plate is welded in the single-piece welding sequence of the existing marine low-speed diesel engine frame. The invention firstly assembles and welds the guide rail plate and the wing plate, and then assembles and welds the two groups of rail plates and the wing plate together through the web plate. The overall welding mode is adjusted to be respectively welded and then assembled and welded, so that the weight of a single-group welded body is reduced, the complexity is reduced, the land leveling operation can be realized, the climbing is not needed, the safety production risk is effectively reduced, a special welding support tool is not needed to be manufactured, and the production cost is favorably saved. According to the assembly welding sequence, the welding of the single piece of the rack is carried out, the risk of falling from the high altitude can be avoided, the production efficiency is improved, the production cost is reduced, and the welding quality is ensured.
Description
Technical Field
The invention relates to the field of manufacturing of ship power frames, in particular to a method for welding a single piece of a low-speed diesel engine frame for a ship.
Background
When the marine low-speed diesel engine frame is manufactured, the frame single sheets in the frame are assembled and welded firstly, and then the frame is integrally assembled and welded. The size of a single piece of the rack is large, the number of parts is large in assembly welding, and the requirements on welding quality and welding forming size precision are high. Meeting the welding requirements requires designing a reasonable assembly welding sequence, and comprehensively considering factors such as welding stress, welding deformation, welding efficiency, safe operation of field operators and the like.
The existing frame welding sequence is shown in fig. 1-3:
FIG. 1: firstly, assembling and welding the guide rail plate and the middle web plate to form an I shape.
FIG. 2: and then assembling the welding wing plate, the bottom plate and the positioning block.
FIG. 3: then assembling and welding the triangular plates at the two sides of the guide rail plate.
The specific steps of the existing frame welding are shown in fig. 4.
The existing welding sequence causes that when a set square is assembled and welded, a single frame sheet needs to be vertically placed on a supporting tool in a side-standing mode for improving welding efficiency, and a welder ascends to a high position to weld by adopting a welding position of transverse welding. The inventor finds that extra cost expenditure is caused by the need of manufacturing a special supporting tool and an aerial work platform, potential safety hazards also exist for operating personnel, and production efficiency is low due to the fact that multiple times of overturning and hoisting are needed when a single frame is welded; meanwhile, the mode needs transverse welding operation, and the welding quality of the mode is inferior to that of a flat welding position.
Disclosure of Invention
The invention aims to provide a novel welding method for a single piece of a frame of a low-speed diesel engine for a ship, which optimizes the assembly welding sequence according to the layout of welding parts and welding seams of the single piece of the frame of the low-speed diesel engine for the ship and the quality requirement. The operation personnel weld the frame monolithic according to this equipment welding order, need not make special support frock and aerial working platform, can avoid the high altitude risk of falling, also improves production efficiency simultaneously, reduction in production cost guarantees welding quality.
One or more embodiments of the present invention provide the following technical solutions. The welding method of the single piece of the low-speed diesel engine frame for the ship comprises the following steps:
the method comprises the following steps: receiving a single-chip part of the rack, performing self-checking on the appearance, continuing the next step if the self-checking is qualified, and returning the part if the self-checking is unqualified;
the single-chip parts of the machine frame comprise a web plate piece, a guide rail plate piece, a wing plate piece, a bottom plate piece and a triangular plate piece.
Step two: the guide rail plate, the wing plate and the bottom plate are divided into two groups, and each group comprises one guide rail plate, one wing plate and one bottom plate; and assembling and welding each group of guide rail plates, wing plates and bottom plates on the flat ground.
Step three: and assembling and welding the triangular plate.
Step four: and (4) integrally assembling and welding, namely welding two edges of the web plate with one guide rail plate respectively to form the diesel engine frame.
In a further improvement, in the first step, the appearance self-inspection comprises checking the size, the shape and the existence of cracks of each part.
In the second step, the method for assembling and welding each group of guide rail plates, wing plates and bottom plates comprises the following steps:
the wing plates are perpendicular to the guide rail plate, and the wing plates are welded to the guide rail plate in a flat welding mode;
then, the bottom plate is welded at one end of the combination body of the wing plate and the guide rail plate, and the plane where the bottom plate is located is perpendicular to the length direction of the wing plate and the guide rail.
The welding seam of the wing plate and the guide rail plate is positioned on the symmetry line of the surface of the guide rail plate where the welding seam is positioned.
And in the third step, the upper edge of the triangular plate is welded with the guide rail plate, and the lower edge of the triangular plate is welded with the wing plate.
In a further improvement, in the fourth step, the plane of the web plate is perpendicular to the plane of the guide rail plate.
In a further improvement, in the first step, the received single-piece part of the rack further comprises two positioning blocks.
Further improvement, the method also comprises the following step five: and welding the positioning block at one end of the guide rail plate.
In a further improvement, in the first step, the received single-piece part of the rack further comprises a plurality of foot pedals and a plurality of handles.
Further improvement, it is characterized by also comprising the sixth step: and welding the pedal on the wing plate, and welding the handle on the wing plate and the triangular plate.
The beneficial effects of one or more of the above technical solutions are as follows:
1) compared with the prior art, the welding device has the advantages that the existing integral welding mode is adjusted to be respectively welded for the two sets of guide rail plates, the wing plates and the bottom plate, then assembly welding is carried out, the weight of a single-set welded assembly is reduced, the complexity is reduced, leveling operation can be realized, ascending is not needed, the safety production risk is effectively reduced, a special welding support tool does not need to be manufactured, and the production cost is saved.
2) The welding method can realize flat ground operation, is favorable for welding long welding seams of workpieces in a flat welding mode, and improves the welding quality compared with the mode of horizontal welding in the prior art.
3) Because the wing plates are welded to form the frame after the two groups of wing plates and the guide rail plate combination are welded, compared with the prior art, the turnover frequency of workpieces is reduced by welding the same number of welding lines, and the workload is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a state after the assembly of a welded guide rail plate and an intermediate web according to the prior art is completed;
FIG. 2 is a state after assembling and welding a wing plate, a base plate and a positioning block in the prior art;
FIG. 3 is a state of a frame after assembling and welding set square plates at both sides of a guide rail plate according to the prior art;
FIG. 4 is a diagram of a prior art specific welding step;
FIG. 5 is a diagram of a welding step provided by an embodiment of the present invention;
FIG. 6 is a received part display view provided by an embodiment of the present invention;
FIG. 7 is a perspective view of the display of FIG. 6 provided by an embodiment of the present invention;
FIG. 8 is a diagram illustrating a state after the assembly and welding of each set of rail plates, wing plates, and bottom plates according to the embodiment of the present invention are completed;
FIG. 9 is a view of the assembled and welded triangular plate provided by the present invention;
FIG. 10 is a state diagram of the frame after the main structure is integrally assembled and welded according to the embodiment of the present invention;
in the figure: 1. a web plate 11, a positioning block 12, a pedal 2, a guide rail plate 3, a wing plate 4, a triangle plate 5, a bottom plate 6 and a handle.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As proposed in the background art, the existing welding method for the single frame of the low-speed diesel engine for the ship needs to manufacture a special supporting tool and an aerial work platform to form extra cost expenditure, the potential safety hazard exists for operators, and the production efficiency is low because the single frame needs to be overturned and hoisted for many times during welding; meanwhile, the mode needs transverse welding operation, and the welding quality of the mode is inferior to that of a flat welding position. According to the new welding method for the marine low-speed diesel engine frame single piece, the optimized welding sequence of the frame single piece is designed according to the layout of welding parts and welding seams of the marine low-speed diesel engine frame single piece and the quality requirement.
In an exemplary embodiment of the present application, as shown in fig. 5, the method comprises the steps of:
step1, receiving the single-chip part of the rack, self-checking the appearance, continuing the next Step if the self-checking is qualified, and returning the part if the self-checking is unqualified, wherein the method comprises the following steps:
step1.1, receiving a frame single-piece part, as shown in figures 6-7, comprising a web plate 1, a guide rail plate 2, a wing plate 3, a triangle plate 4, a bottom plate 5, a positioning block 11, a plurality of handles 6 and a plurality of pedals 12.
The received one-piece part of the housing is shown in fig. 6.
Step1.2, self-checking appearance, the checked appearance content includes the size, shape and whether there is a crack.
Step1.3, continuing the next step if the self-inspection is qualified, and returning the parts if the self-inspection is unqualified.
Step2, grouping the guide rail plates 2, the wing plates 3 and the bottom plate 5, assembling and welding each group of guide rail plates, wing plates and bottom plate on the flat ground, and forming the concrete steps as shown in fig. 8:
step2.1, the guide rail plate 2, the wing plate 3 and the bottom plate 5 are divided into two groups, and each group comprises a guide rail plate, a wing plate and a bottom plate.
Step2.2, assembling and welding a group of rail plates 2, wing plates 3 and a bottom plate 5, specifically comprising:
step2.21, the wing plates 3 are perpendicular to the guide rail plate 2, the wing plates are welded to the guide rail plate in a flat welding mode, and the welding seams of the wing plates and the guide rail plate are located on the symmetry line of the plane where the welding seams are located on the guide rail.
And Step2.22, welding a bottom plate 5 at one end of the combination of the wing plate 3 and the guide rail plate 2, wherein the plane of the bottom plate is vertical to the length directions of the wing plate and the guide rail.
And Step2 and 23, assembling and welding the other group of the rail plate 2, the wing plate 3 and the bottom plate 5 in the same welding mode as that of Step2.21, and welding the bottom plate at one end of the combination of the wing plate and the guide rail plate in the same welding mode as that of Step 2.22.
Step3, assembling and welding the triangle 4, as shown in fig. 9, specifically comprising:
step3.1, assembling and welding a triangular plate 4 on a combination of one wing plate 3 and the guide rail plate 2, welding the upper edge of the triangular plate with the guide rail plate, and welding the lower edge with the wing plate, wherein the welding modes are flat welding.
And step3.2, assembling and welding a triangular plate on the other assembly of the wing plate and the guide rail plate in the same way as the step 3.1.
Here, the triangle is not triangular in shape, but is named as a triangle because it forms a triangular prism space with the wing plate and the guide rail plate, and the cross section of the space is triangular.
Step4, wholly assemble the welding, with two edges of web 1 respectively with a guide rail plate 2 welding, form the diesel engine frame, specifically include:
and Step4.1, welding the edge of one side of the web plate 1 to the guide rail plate 2 in the combination of the wing plate 3 and the guide rail plate 2 in a flat welding mode.
And Step4.1, welding the edge of the other side of the web plate to the guide rail in the combination of the other wing plate and the guide rail plate in a flat welding mode.
At the moment, the whole assembly and welding of the main body structure of the diesel engine frame are completed.
For Step2-Step4, because the two groups of wing plates and the guide rail plate combination are firstly assembled and welded and then the wing plates are welded to form the frame, compared with the prior art, the turnover frequency of the workpiece is reduced and the workload is reduced by welding the same number of welding seams.
Step5, welding the positioning block 11 at one end of the guide rail plate 2, which is the end opposite to the bottom plate.
Step6, the Step 12 is welded to the wing plate, and the handle 6 is welded to the triangle and the wing plate.
Through above-mentioned step can see, for the prior art earlier assembly welding web, guide rail plate, the mode of back welding pterygoid lamina, this application is the assembly welding guide rail plate, pterygoid lamina earlier, and rethread web is in the same place two sets of rail plates, pterygoid lamina assembly welding.
Therefore, the existing integral welding mode is adjusted to be that two groups of guide rail plates, wing plates and bottom plates are respectively welded and then assembled and welded, the weight of a single-group welded assembly is reduced, the complexity is reduced, the land leveling operation can be realized, the climbing is not needed, and the safety production risk is effectively reduced; and a special welding support tool is not required to be manufactured, so that the production cost is saved.
And the flat land operation is favorable for welding the long welding seam of the workpiece in a flat welding mode, and the welding quality is improved compared with the prior art which needs horizontal welding.
Because the wing plates are welded to form the frame after the two groups of wing plates and the guide rail plate combination are welded, compared with the prior art, the turnover frequency of workpieces is reduced by welding the same number of welding lines, and the workload is reduced.
Claims (10)
1. A welding method for a single piece of a frame of a marine low-speed diesel engine is characterized by comprising the following steps:
the method comprises the following steps: receiving a single-chip part of the rack, performing self-checking on the appearance, continuing the next step if the self-checking is qualified, and returning the part if the self-checking is unqualified;
the single-chip parts of the machine frame comprise a web plate part, a guide rail plate part, a wing plate part, a bottom plate part and a triangular plate part;
step two: the guide rail plate, the wing plate and the bottom plate are divided into two groups, and each group comprises one guide rail plate, one wing plate and one bottom plate; assembling and welding each group of guide rail plates, wing plates and bottom plates on the flat ground;
step three: assembling and welding a triangular plate;
step four: and (4) integrally assembling and welding, namely welding two edges of the web plate with one guide rail plate respectively to form the diesel engine frame.
2. The marine low speed diesel engine frame monolithic welding method of claim 1, wherein in the first step, the self-checking appearance comprises checking the size, shape and cracks of each part.
3. The marine low-speed diesel engine frame single sheet welding method according to claim 1, wherein in the second step, the method for assembling and welding each group of the guide rail plate, the wing plate and the bottom plate comprises the following steps:
the wing plates are perpendicular to the guide rail plate, and the wing plates are welded to the guide rail plate in a flat welding mode;
then, the bottom plate is welded at one end of the combination body of the wing plate and the guide rail plate, and the plane where the bottom plate is located is perpendicular to the length direction of the wing plate and the guide rail.
4. The welding method for one piece of marine low speed diesel engine frame according to claim 3, wherein the weld of the wing plate and the rail plate is located on the rail plate at the symmetry line of the surface where the weld is located.
5. The welding method of the marine low-speed diesel engine frame single piece according to claim 1, wherein in the third step, the upper edge of the triangular plate is welded with the guide rail plate, and the lower edge is welded with the wing plate.
6. The welding method for single frame of low speed diesel engine for ship of claim 1, wherein in step four, the plane of web is perpendicular to the plane of guide rail plate.
7. The marine low speed diesel engine frame singles welding method of claim 1, wherein in step one, the received frame singles further comprises two locating pieces.
8. The marine low speed diesel engine frame monolith welding method of claim 7, further comprising the step of five: and welding the positioning block at one end of the guide rail plate.
9. The method for welding marine low speed diesel engine frame pieces according to claim 8, wherein in step one, the received frame piece parts further comprise a step and a pull handle.
10. The marine low speed diesel engine frame monolith welding method of claim 9, further comprising the steps of six: and welding the pedal on the wing plate, and welding the handle on the wing plate and the triangular plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010119376.XA CN111168315A (en) | 2020-02-26 | 2020-02-26 | Single-piece welding method for low-speed diesel engine frame for ship |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010119376.XA CN111168315A (en) | 2020-02-26 | 2020-02-26 | Single-piece welding method for low-speed diesel engine frame for ship |
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| CN111168315A true CN111168315A (en) | 2020-05-19 |
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| CN202010119376.XA Pending CN111168315A (en) | 2020-02-26 | 2020-02-26 | Single-piece welding method for low-speed diesel engine frame for ship |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111872643A (en) * | 2020-08-04 | 2020-11-03 | 中国船舶重工集团柴油机有限公司 | Assembly welding process for guide rail plate, wing plate and bottom plate of diesel engine frame and product |
| CN113478148A (en) * | 2021-07-20 | 2021-10-08 | 中国船舶重工集团柴油机有限公司 | Rapid assembling and welding tool and method for diesel engine frame pedal |
| CN113478055A (en) * | 2021-07-22 | 2021-10-08 | 中国船舶重工集团柴油机有限公司 | Diesel engine frame single-piece double-face double-arc synchronous gas shield welding process |
| CN113695775A (en) * | 2021-09-27 | 2021-11-26 | 大连船用柴油机有限公司 | Method for assembling and welding lower panel of long rib plate of large-scale low-speed marine diesel engine frame |
| CN115156750A (en) * | 2022-07-28 | 2022-10-11 | 大连船用柴油机有限公司 | Single piece assembling method for large low-speed marine diesel engine base |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111872643A (en) * | 2020-08-04 | 2020-11-03 | 中国船舶重工集团柴油机有限公司 | Assembly welding process for guide rail plate, wing plate and bottom plate of diesel engine frame and product |
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| CN113478055A (en) * | 2021-07-22 | 2021-10-08 | 中国船舶重工集团柴油机有限公司 | Diesel engine frame single-piece double-face double-arc synchronous gas shield welding process |
| CN113695775A (en) * | 2021-09-27 | 2021-11-26 | 大连船用柴油机有限公司 | Method for assembling and welding lower panel of long rib plate of large-scale low-speed marine diesel engine frame |
| CN113695775B (en) * | 2021-09-27 | 2022-10-21 | 大连船用柴油机有限公司 | Method for assembling and welding lower panel of long rib plate of large-scale low-speed marine diesel engine frame |
| CN115156750A (en) * | 2022-07-28 | 2022-10-11 | 大连船用柴油机有限公司 | Single piece assembling method for large low-speed marine diesel engine base |
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Application publication date: 20200519 |
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