Single piece assembly process and welding method for marine engine base
Through the coordinated welding of the intermediate assembly tooling and dual welding machines with three-level positioning function, the problems of low efficiency, insufficient accuracy and high safety risks in the manufacturing of traditional marine engine bases are solved, and an efficient, safe and economical assembly and welding process is achieved.
Patent Information
- Application Number
- CN202510880152.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-27
- Publication Date
- 2025-08-29
AI Technical Summary
The traditional marine engine base manufacturing process has problems such as low assembly efficiency, insufficient accuracy, high safety risks and large material consumption, especially in multiple flips and single welding machine operations, which affects the overall production cycle and welding quality.
The intermediate assembly tooling with three-level positioning function is combined with dual-stage single-chip parallel assembly, dual-welder collaborative welding and integrated flip design, and synchronous assembly and welding are achieved through a multi-level positioning combined tooling system, reducing the number of flips, improving assembly accuracy and safety, and optimizing welding quality.
It significantly improves assembly efficiency and accuracy, reduces safety risks, reduces material consumption, shortens manufacturing cycles, and reduces energy consumption and manufacturing costs.
Smart Images
Figure CN120551981A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of marine engine assembly, and in particular to a marine engine base monolithic assembly process and a welding method. Background Art
[0002] The engine base of a marine engine is a key supporting structure of a ship's power system. It has high strength requirements and needs to withstand the vibration, impact and thermal stress of the engine during operation. It is also large in size and weight. A single-chip engine base can weigh several tons. Assembly and welding require special tooling and lifting equipment. It is usually composed of a ZG200-400 cast steel intermediate and a Class B ship plate wing plate welded together. The number of single pieces is generally 6 to 9, and multiple single pieces need to be precisely docked. The shape and position tolerances of the overall engine base are strict. The traditional manufacturing process adopts a single-piece serial production method, which first assembles and welds a single piece, that is, assembles the cast steel intermediate and wing plate first, adjusts the shape after welding, and then assembles the pedal and welds it a second time, and then flips it multiple times. After each welding process is completed, the workpiece needs to be flipped to weld or adjust the other side. The welding operation is performed by a single welding machine during the process, and the welding of each engine base is completed one by one. However, there are some technical problems with the traditional manufacturing process: First, assembly efficiency is low and production cycle is long. The traditional process uses single-piece serial assembly, that is, completing one piece before moving on to the next. This results in a long overall manufacturing cycle. Multiple flipping (welding one side, flipping, and then welding the other side) further increases working hours. Second, insufficient assembly precision leads to unstable welding quality. Dimensional errors (such as flatness and height differences) between the cast steel intermediate and the Class B ship wing require repeated adjustments during assembly, affecting welding quality. Traditional tooling has limited positioning capabilities and is unable to effectively compensate for part errors, which can easily lead to welding deformation or misalignment. Third, the safety risk is high. The machine base is a large and heavy workpiece. Traditional processes require multiple lifting and flipping. Uneven force can easily lead to skewed lifting, increasing safety hazards. Frequent flipping can also cause workpiece deformation, affecting the final assembly accuracy. Fourth, each welding process requires the installation and removal of arc-starting and arc-ending plates, which increases additional working hours and material consumption. Single-welding machine operation doubles the welding time, affecting overall production efficiency. Summary of the Invention
[0003] In response to the problems existing in the prior art, the present invention provides a single-piece assembly process and welding method for a marine engine base. By setting an intermediate assembly tool with a three-level positioning function, the wing plate height adjustment tool and the intermediate assembly tool are placed on a workbench to assemble two single-pieces of the engine base, thereby absorbing the assembly errors of the parts. The engine base single piece and the intermediate assembly tool are rigidly connected and fixed by assembly bolts, thereby realizing the simultaneous assembly, welding and flipping of the two single pieces, solving the problems of low production efficiency and high safety risks of the existing production method, reducing the number of flipping times of large parts, saving the installation and cutting time of the arc initiation and collection plates, and simultaneously welding two single pieces with two welding machines, thereby shortening the manufacturing cycle of the engine base single piece.
[0004] The technical solutions of the present invention are as follows: In a first aspect of the present invention, a monolithic assembly process for a marine engine base is provided, wherein the assembly process is implemented using an intermediate assembly tool, a plurality of combined positioning toolings, and a plurality of wing plate positioning and adjustment toolings, wherein the intermediate assembly tooling is symmetrically provided with primary and tertiary positioning holes at both ends, and a secondary positioning hole is provided in the middle of the intermediate assembly tooling; The intermediate body assembly tooling, several combined positioning tooling and several wing plate positioning and adjustment tooling are set on the workbench, and the two intermediate bodies are pre-assembled and positioned in a mirror image in sequence using the first-level positioning holes. The intermediate body and the intermediate body assembly tooling are connected and fixed by assembling bolts in conjunction with the second-level positioning holes and the third-level positioning holes. The wing plate positioning and adjustment tooling is used to assemble the wing plates on the outside of the two intermediate bodies respectively. The combined positioning tooling is used to assemble and position the wing plates and the intermediate body to realize the single-piece assembly of the dual-base. In some embodiments of the present invention, the workbench is provided with several slide grooves, and the bottoms of the intermediate body assembly tooling, several combined positioning tooling and several wing plate positioning and adjustment tooling are all provided with sliders, and the intermediate body assembly tooling, several combined positioning tooling and several wing plate positioning and adjustment tooling are connected and fixed to the slide grooves on the workbench through sliders. In some embodiments of the present invention, the intermediate body assembly tooling, several combined positioning tooling and several wing plate positioning and adjustment tooling are set on the workbench. Specifically, the intermediate body assembly tooling is first set on the workbench, and then the several wing plate positioning and adjustment tooling are set on the outside of the intermediate body assembly tooling, and then the several combined positioning tooling are set at one end of the intermediate body assembly tooling, located at the assembly connection position of the intermediate body and one end of the wing plate. In some embodiments of the present invention, the intermediate body is connected and fixed to the intermediate body assembly tooling by assembling bolts in conjunction with secondary positioning holes and tertiary positioning holes. Specifically, the assembling bolts include secondary assembly bolts and tertiary assembly bolts. The secondary assembly bolts are first used in conjunction with the secondary positioning holes to perform secondary assembly on the intermediate body, and then the tertiary assembly bolts are used in conjunction with the tertiary positioning holes to assemble and position the intermediate body. In some embodiments of the present invention, the intermediate assembly tool is configured as a bar structure, the two ends of the intermediate body are configured as arc structures, the arc structures are provided with a primary positioning hole and a plurality of tertiary positioning holes; the middle portion of the intermediate body is configured as a rectangular structure, the rectangular structure is provided with a plurality of secondary positioning holes; One end of the intermediate arc structure is provided with a flip lug, and the other end of the intermediate arc structure is provided with two transition support lugs. In some embodiments of the present invention, the bottom of the wing plate positioning and adjustment tool is provided with an equal height block, the upper part of the equal height block is set as a hollow conical structure, the top of the conical structure is connected to the height adjustment structure by a thread, the bottom of the height adjustment structure is provided with a handle located in the hollow conical structure, and the top of the height adjustment structure is set as an arc structure to abut the wing plate. In some embodiments of the present invention, a T-shaped slider is provided at the bottom of the combined positioning tool, an L-shaped plate structure is provided on the top of the T-shaped slider, and a strip-shaped protrusion structure is provided on a side of the L-shaped plate structure close to the wing plate. In some embodiments of the present invention, transition cone surfaces are provided in the middle portions of the secondary assembly bolts and the tertiary assembly bolts. In a second aspect of the present invention, a welding method based on the above-mentioned single-piece assembly process for a marine engine base is provided, comprising: The assembled double-base single piece is hoisted to the welding station using the intermediate assembly tooling; Use dual welding machines to weld synchronously to complete the welds between the intermediate body and one side of the wing plate; Use the intermediate assembly tool to flip the two single pieces 180 degrees at the same time, lift the flip lug at one end, and use the two transition fulcrum lugs at the bottom as flip transition fulcrums to flip; After flipping, dual welding machines are used to weld the seams between the intermediate body and the other side of the wing plate synchronously; After the wing panels are welded, assemble the footrests according to the dimensions on the drawing. After the footrests are welded, turn them 180° and install and weld the other footrests again. After welding is completed, the two pieces of the machine base are separated from the tooling and subjected to VT, MT, and UT inspections. After passing the inspections, they are transferred to the machine base assembly process.
[0005] In some embodiments of the present invention, the dual-welder synchronous welding method is specifically to set two parallel welding tracks on both sides of the intermediate body, and respectively set a first welder and a second welder on the two welding tracks to weld the intermediate body and the two side wing plates.
[0006] One or more technical solutions of the present invention have the following beneficial effects: The present invention provides a single-piece assembly process and welding method for a marine engine base. This process reconstructs the traditional single-piece assembly manufacturing process for a marine engine base through a multi-level positioning modular tooling system, a dual-piece parallel assembly operation mode, an integrated flip design, and collaborative welding with two welders. This process achieves a synergistic breakthrough in efficiency, precision, safety, and economy, including: Through the parallel assembly and welding of two pieces and the use of a mirror-symmetrical tooling layout, the synchronous assembly of two single pieces on the two machine bases is supported, which completely changes the traditional serial operation mode, greatly improves the efficiency of the assembly process, and optimizes the flipping process. The integrated lifting lugs of the tooling are used to achieve a synchronous 180° flip of the two single pieces, which greatly reduces the number of flips and avoids the production line stagnation caused by repeated lifting of single pieces in the traditional process. In addition, based on the assembly process, a mode of collaborative operation of two welders is adopted, parallel welding tracks are set on both sides of the intermediate body, and the two welders weld synchronously, shortening the welding time. The present invention sets a three-level error compensation mechanism: the first level pre-positioning and coarse adjustment of the intermediate position to absorb the initial error; the second level transition locking, adaptive hole position deviation, releases assembly stress; the third level rigid fixation, and the final locking ensures positioning accuracy, greatly improving assembly accuracy and significantly enhancing welding quality. In addition, deformation is controlled collaboratively through the combination of multiple toolings. The wing plate adjustment tooling eliminates the flatness error of the plate through thread fine-tuning; the bar-shaped protrusions of the combined positioning tooling constrain lateral displacement; the double welding machines perform symmetrical welding to balance the heat input, effectively reducing the welding deformation rate.
[0007] At the same time, the tooling's integrated lifting lugs serve as turning fulcrums, eliminating the risk of tilting or slanting during traditional lifting, reducing the accident rate and systematically lowering safety risks. This effectively controls the risks of operating heavy workpieces, and reduces the number of flips, effectively avoiding the risk of workpieces slipping. The T-shaped sliders provide a vibration torque to prevent the tooling from tipping over during welding, and the slideway slider structure supports position adjustment, making it suitable for assembly with machine bases of different specifications. The tapered bolt tolerance design accommodates differences in part batches. In addition, the parallel operation of the two pieces reduces the standby time of the welding machine, effectively reducing energy consumption; it reduces the use of arc-starting and arc-ending plates, saving materials and cutting time, and the improvement of the assembly accuracy of the entire process reduces the rework rate, thereby achieving an overall reduction in the manufacturing cost of a single machine base. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 This is a structural diagram of a single chip of a marine engine base provided by Example 1 of the present invention; Figure 2 A schematic structural diagram of the intermediate assembly tool provided in Example 1 of the present invention; Figure 3 A schematic structural diagram of the wing panel positioning and adjustment tooling provided in Example 1 of the present invention; Figure 4A schematic structural diagram of the combined positioning tool provided in Example 1 of the present invention; Figure 5 A schematic structural diagram of a secondary assembly bolt provided in Example 1 of the present invention; Figure 6 A schematic structural diagram of a three-stage assembly bolt provided in Example 1 of the present invention; Figure 7 A schematic structural diagram of an intermediate body assembly tool, a plurality of combined positioning tools, and a plurality of wing plate positioning and adjustment tools provided in Example 1 of the present invention arranged on a workbench; Figure 8 A schematic structural diagram of the assembly of the intermediate and intermediate assembly tooling provided in Example 1 of the present invention; Figure 9 A schematic structural diagram of the assembly of the wing plate and the intermediate body provided in Example 1 of the present invention; Figure 10 This is a schematic structural diagram of the wing plate and the intermediate body provided in Example 1 of the present invention being connected and fixed by assembly bolts; Figure 11 This is a schematic diagram of the structure of lifting a single piece with two machine bases provided in Example 1 of the present invention; Figure 12 A schematic structural diagram of a double-base single-chip single-side welding process provided in Example 1 of the present invention; Figure 13 This is a schematic diagram of the structure of a double-base single chip provided in Example 1 of the present invention, which is flipped after single-side welding. Figure 14 This is a schematic diagram of the structure of the double-base single-piece flipping provided by Example 1 of the present invention, performing secondary single-sided welding, and then flipping; Figure 15 This is a schematic structural diagram of the first pedal welding of a double-base single-piece single-sided structure provided by Example 1 of the present invention; Figure 16 This is a schematic structural diagram of the second pedal welding on the other side of the double-base single piece after flipping over provided by Example 1 of the present invention; In the figure: 1. Machine base single piece; 2. First-level assembly boss; 3. Second-level assembly hole; 4. Third-level assembly hole; 5. Wing plate; 6. Footrest; 7. Intermediate body; 8. Intermediate body assembly tool; 9. First-level positioning hole; 10. Second-level positioning hole; 11. Third-level positioning hole; 12. Combined positioning tool; 13. T-shaped slider; 14. Intermediate body assembly surface; 15. Wing plate assembly surface; 16. Wing plate positioning and adjustment tool; 17. Equal height block; 18. Height adjustment structure; 19. Workbench; 20. Second-level assembly bolt; 21. Third-level assembly bolt; 22. Flip lug; 23. Transition fulcrum lug; 24. First welding machine; 25. Second welding machine; 26. Welding track; 27. Transition cone surface. DETAILED DESCRIPTION
[0009] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0010] Example 1 In a typical embodiment of the present invention, a monolithic assembly process for a marine engine base is provided. The assembly process is implemented by an intermediate assembly tool 8, a plurality of combined positioning tooling 12, and a plurality of wing plate positioning and adjustment tooling 16. The intermediate assembly tool 8 is symmetrically provided with a primary positioning hole 9 and a tertiary positioning hole 11 at both ends, and a secondary positioning hole 10 is provided in the middle of the intermediate assembly tool 8. The intermediate body assembly tool 8, several combined positioning toolings 12 and several wing plate positioning and adjustment toolings 16 are set on the workbench 19, and the two intermediate bodies 7 are pre-assembled and positioned in a mirror image in sequence using the first-level positioning holes 9. The intermediate body 7 is connected and fixed to the intermediate body assembly tooling 8 by assembling bolts in conjunction with the second-level positioning holes 10 and the third-level positioning holes 11. The wing plate positioning and adjustment tooling 16 is used to assemble the wing plates 5 on the outside of the two intermediate bodies 7 respectively. The combined positioning tooling 12 is used to assemble and position the wing plates 5 and the intermediate body 7 to realize the assembly of the double-base single-piece 1.
[0011] In this embodiment, the base monolith 1 includes an intermediate body 7 and a wing plate 5 . The intermediate body 7 is provided with a primary assembly boss 2 , a secondary assembly hole 3 , and a tertiary assembly hole 4 . The wing plate 5 is provided with a pedal 6 .
[0012] Through the mirror design of the intermediate assembly tool 8, the synchronous assembly of the double-base single piece 1 is achieved, which reduces the assembly time. By setting up a three-level error compensation mechanism, that is, the first-level assembly boss 2 and the first-level positioning hole 9 are assembled to achieve the first-level pre-positioning and coarse adjustment of the intermediate body 7 position to absorb the initial error; the second-level assembly bolt 20 is assembled with the second-level assembly hole 3 and the second-level positioning hole 10 to achieve the second-level transition locking, adaptive hole position deviation, and release assembly stress; the third-level assembly bolt 21 is assembled with the third-level assembly hole 4 and the third-level positioning hole 11 to achieve third-level rigid fixation, and the final locking ensures positioning accuracy, greatly improves the assembly accuracy and significantly enhances the welding quality; and through the collaborative control of deformation by a combination of multiple tooling types, the risk of welding deformation is reduced.
[0013] In some embodiments of the present invention, the workbench 19 is provided with several slide grooves, and the bottoms of the intermediate body assembly tooling 8, several combined positioning tooling 12 and several wing plate positioning and adjustment tooling 16 are all provided with sliders, and the intermediate body assembly tooling 8, several combined positioning tooling 12 and several wing plate positioning and adjustment tooling 16 are connected and fixed to the slide grooves on the workbench 19 through sliders. Such an arrangement enables rapid adaptation and high installation stability of the intermediate assembly tooling 8, several combined positioning toolings 12 and several wing plate positioning and adjustment toolings 16 with the workbench 19. The slider at the bottom of the tooling cooperates with the slide groove of the workbench 19 to achieve fine-tuning of the position to adapt to the assembly of single-piece machine bases 1 of different sizes; at the same time, the shear resistance performance is improved to prevent the tooling from shifting due to welding vibration.
[0014] In some embodiments of the present invention, the intermediate body assembly tooling 8, several combined positioning tooling 12 and several wing plate positioning and adjustment tooling 16 are set on the workbench 19. Specifically, the intermediate body assembly tooling 8 is first set on the workbench 19, and then the several wing plate positioning and adjustment tooling 16 are set on the outside of the intermediate body assembly tooling 8, and then the several combined positioning tooling 12 are set at one end of the intermediate body assembly tooling 8, located at the assembly connection position of the intermediate body 7 and one end of the wing plate 5. Such an arrangement strictly limits the installation sequence of the tooling, avoids installation interference, standardizes the process, reduces the assembly preparation time, concentrates multiple tooling combinations at the junction of the intermediate body 7 and the wing plate 5, reduces the area occupied by the workbench 19, and improves space utilization.
[0015] In some embodiments of the present invention, the intermediate body 7 is connected and fixed to the intermediate body assembly tool 8 by assembling bolts in conjunction with the secondary positioning holes 10 and the tertiary positioning holes 11. Specifically, the assembling bolts include secondary assembly bolts 20 and tertiary assembly bolts 21. The secondary assembly bolts 20 are first used in conjunction with the secondary positioning holes 10 to perform secondary assembly on the intermediate body 7, and then the tertiary assembly bolts 21 are used in conjunction with the tertiary positioning holes 11 to assemble and position the intermediate body 7. With this arrangement, the secondary assembly bolts 20 achieve transitional fixation, and the tertiary assembly bolts 21 achieve a step-by-step operation of final tightening, thereby reducing internal assembly stress, achieving graded stress release during assembly, and preventing assembled workpieces from cracking.
[0016] In some embodiments of the present invention, the intermediate assembly tool 8 is configured as a strip structure, the two ends of the intermediate body 7 are configured as arc structures, and the arc structures are provided with a primary positioning hole 9 and a plurality of tertiary positioning holes 11; the middle portion of the intermediate body 7 is configured as a rectangular structure, and the rectangular structure is provided with a plurality of secondary positioning holes 10; One end of the arc-shaped structure of the intermediate body 7 is provided with a flip lug 22 , and the other end of the arc-shaped structure of the intermediate body 7 is provided with two transition support lugs 23 .
[0017] The arc-shaped end and the intermediate body 7 are adaptively assembled to avoid installation interference. The middle rectangular structure strengthens the bearing capacity. The single flip lug 22 end is used for lifting, and the double flip lug 22 end is specially used as a flip fulcrum to improve the flip stability.
[0018] In some embodiments of the present invention, a contour block 17 is provided at the bottom of the wing plate positioning and adjustment tooling 16, and the upper part of the contour block 17 is set as a hollow conical structure. The top of the conical structure is connected to a height adjustment structure 18 through a thread, and the bottom of the height adjustment structure 18 is provided with a handle located in the hollow conical structure, and the top of the height adjustment structure 18 is set as an arc structure to abut against the wing plate 5. The tapered hollow structure is embedded with a threaded height adjustment structure 18. By fine-tuning the handle, the flatness error of the wing plate 5 is eliminated to achieve precise leveling. The top surface of the arc fits the curved surface of the wing plate 5, dispersing local pressure and preventing indentations on the assembled workpiece.
[0019] In some embodiments of the present invention, a T-shaped slider 13 is provided at the bottom of the combined positioning tool 12, an L-shaped plate structure is provided on the upper portion of the T-shaped slider 13, and a strip-shaped protrusion structure is provided on a side of the L-shaped plate structure close to the wing plate 5.
[0020] The L-shaped plate structure of the combined positioning fixture 12 is provided with an intermediate body assembly surface 14 and the strip-shaped protruding structure is provided with a wing plate assembly surface 15 for restricting the displacement of the assembled workpiece to achieve stable assembly.
[0021] In some embodiments of the present invention, a transition cone 27 is provided in the middle of the secondary assembly bolt 20 and the tertiary assembly bolt 21. The transition cone 27 guides the bolt into the deviation hole position, allows a certain assembly error, and reduces the rework rate.
[0022] In a second aspect of the present invention, a welding method based on the above-mentioned single-piece assembly process for a marine engine base is provided, comprising: The assembled double-base single piece 1 is lifted and transported to the welding station using the intermediate assembly tool 8; Use dual welding machines to weld synchronously to complete the weld between the intermediate body 7 and one side of the wing plate 5; Use the intermediate assembly tool 8 to flip the two single pieces 180 degrees at the same time, lift the flip lug 22 at one end, and use the two transition fulcrum lugs 23 at the bottom as flip transition fulcrums to flip; After flipping, dual welding machines are used to weld the seam between the intermediate body 7 and the other side of the wing plate 5 simultaneously; After the wing plate 5 is welded, the footrest 6 is assembled according to the drawing size. After the footrest 6 is welded, it is turned 180 degrees as a whole and the other side footrest 6 is installed and welded again. After welding is completed, the two pieces of the machine base are separated from the tooling and subjected to VT, MT, and UT inspections. After passing the inspections, they are transferred to the machine base assembly process.
[0023] In some embodiments of the present invention, the dual-welder synchronous welding method is specifically as follows: two parallel welding tracks 26 are set on both sides of the intermediate body 7, and a first welder 24 and a second welder 25 are respectively set on the two welding tracks 26 to weld the intermediate body 7 and the two side wing plates 5.
[0024] The present invention provides a single-piece assembly process and welding method for a marine engine base. This process reconstructs the traditional single-piece assembly and manufacturing process for a marine engine base through a multi-level positioning modular tooling system, a dual-piece parallel assembly operation mode, an integrated flip design, and collaborative welding with two welders. This process achieves a synergistic breakthrough in efficiency, precision, safety, and economy. Specifically: Through the parallel assembly and welding of the two-base single-piece 1, the use of a mirror-symmetrical tooling layout supports the synchronous assembly of the two-base single-piece 1, which completely changes the traditional serial operation mode, greatly improves the efficiency of the assembly process, and optimizes the flipping process. The tooling integrated flip lug 22 and the transition support lug 23 are used to achieve the synchronous 180° flipping of the two single-pieces, which greatly reduces the number of flips and avoids the production line stagnation caused by repeated lifting of a single piece in the traditional process. In addition, based on the assembly process, a mode of collaborative operation of two welders is set up with parallel welding tracks 26 on both sides of the intermediate body 7. The two welders weld synchronously, shortening the welding time. The present invention provides a three-level error compensation mechanism. The first-level assembly boss 2 and the first-level positioning hole 9 are assembled to achieve a first-level pre-positioning and rough adjustment of the intermediate body 7, thereby eliminating the initial error. The second-level assembly bolt 20 is assembled with the second-level assembly hole 3 and the second-level positioning hole 10 to achieve a second-level transition locking, which adapts to the hole position deviation and releases the assembly stress. The third-level assembly bolt 21 is assembled with the third-level assembly hole 4 and the third-level positioning hole 11 to achieve a third-level rigid fixation. The final locking ensures the positioning accuracy, greatly improving the assembly accuracy and significantly enhancing the welding quality. In addition, deformation is controlled collaboratively through the combination of multiple toolings. The wing plate 5 adjustment tooling eliminates the flatness error of the plate through thread fine-tuning; the L-shaped plate structure of the combined positioning tooling 12 is provided with an intermediate body assembly surface 14 and the strip-shaped protrusion structure is provided with a wing plate assembly surface 15 for constraining displacement; the double welding machines perform symmetrical welding to balance the heat input, which effectively reduces the welding deformation rate.
[0025] At the same time, the tooling integrated hoist uses the flip lug 22 and the transition fulcrum lug 23 as the flip fulcrum, eliminating the risk of tilting and slanting in traditional hoisting, reducing the accident rate, systematically reducing safety risks, and effectively controlling the risks of heavy workpiece operation. Since the number of flips is reduced, the hidden danger of workpiece slippage is effectively avoided; the T-shaped slider 13 is set with a vibration torque to prevent the tooling from overturning during welding, and the slide slider structure supports position adjustment and can be adapted to the assembly of machine bases of different specifications; the tolerance design of the tapered bolt is compatible with the differences in part batches; In addition, the parallel operation of the two pieces reduces the standby time of the welding machine, effectively reducing energy consumption; it reduces the use of arc-starting and arc-ending plates, saving materials and cutting time, and the improvement of the assembly accuracy of the entire process reduces the rework rate, thereby achieving an overall reduction in the manufacturing cost of a single machine base.
[0026] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.
Claims
1. A single-piece assembly process for a marine engine base, characterized in that: The assembly process is realized by an intermediate assembly tool, a plurality of combined positioning toolings and a plurality of wing plate positioning and adjustment toolings. The intermediate assembly tooling is symmetrically provided with a primary positioning hole and a tertiary positioning hole at both ends, and a secondary positioning hole is provided in the middle of the intermediate assembly tooling. The intermediate body assembly tooling, several combined positioning tooling and several wing plate positioning and adjustment tooling are set on the workbench, and the two intermediate bodies are pre-assembled and positioned in a mirror image in sequence using the first-level positioning holes. The intermediate body and the intermediate body assembly tooling are connected and fixed by assembling bolts in conjunction with the second-level positioning holes and the third-level positioning holes. The wing plate positioning and adjustment tooling is used to assemble the wing plates on the outside of the two intermediate bodies respectively. The combined positioning tooling is used to assemble and position the wing plates and the intermediate body to realize the single-piece assembly of the dual-base.
2. A single-piece assembly process for a marine engine base according to claim 1, characterized in that: The workbench is provided with several slide grooves, and the bottoms of the intermediate body assembly tooling, several combined positioning tooling and several wing plate positioning and adjustment tooling are all provided with sliders, and the intermediate body assembly tooling, several combined positioning tooling and several wing plate positioning and adjustment tooling are connected and fixed to the slide grooves on the workbench through the sliders.
3. A single-piece assembly process for a marine engine base according to claim 1, characterized in that: The intermediate body assembly tooling, several combined positioning tooling and several wing plate positioning and adjustment tooling are arranged on the workbench. Specifically, the intermediate body assembly tooling is first arranged on the workbench, and then the several wing plate positioning and adjustment tooling are arranged on the outside of the intermediate body assembly tooling. Then, the several combined positioning tooling are arranged at one end of the intermediate body assembly tooling, at the position where the intermediate body and one end of the wing plate are assembled and connected.
4. A single-piece assembly process for a marine engine base according to claim 1, characterized in that: The intermediate body is connected and fixed to the intermediate body assembly tooling by assembling bolts in conjunction with the secondary positioning holes and the tertiary positioning holes. Specifically, the assembling bolts include secondary assembling bolts and tertiary assembling bolts. The secondary assembling bolts are first used in conjunction with the secondary positioning holes to perform secondary assembly on the intermediate body, and then the tertiary assembling bolts are used in conjunction with the tertiary positioning holes to assemble and position the intermediate body.
5. The process for assembling a single piece of a marine engine base according to claim 1, wherein: The intermediate assembly tooling is configured as a strip structure, the two ends of the intermediate body are configured as arc structures, the arc structures are provided with a primary positioning hole and a plurality of tertiary positioning holes; the middle portion of the intermediate body is configured as a rectangular structure, the rectangular structure is provided with a plurality of secondary positioning holes; One end of the intermediate arc structure is provided with a flip lug, and the other end of the intermediate arc structure is provided with two transition support lugs.
6. A single-piece assembly process for a marine engine base according to claim 1, characterized in that: The bottom of the wing plate positioning and adjustment tooling is provided with an equal height block, the upper part of the equal height block is set as a hollow conical structure, the top of the conical structure is connected to the height adjustment structure by a thread, the bottom of the height adjustment structure is provided with a handle located in the hollow conical structure, and the top of the height adjustment structure is set as an arc structure to abut against the wing plate.
7. A single-piece assembly process for a marine engine base according to claim 1, characterized in that: A T-shaped slider is provided at the bottom of the combined positioning tool, an L-shaped plate structure is provided on the upper portion of the T-shaped slider, and a strip-shaped protrusion structure is provided on a side of the L-shaped plate structure close to the wing plate.
8. The process for assembling a single piece of a marine engine base according to claim 1, wherein: The middle parts of the secondary assembly bolts and the tertiary assembly bolts are provided with transition cone surfaces.
9. A welding method for a single-piece assembly process of a marine engine base according to any one of claims 1 to 9, characterized in that: include: The assembled double-base single piece is hoisted to the welding station using the intermediate assembly tooling; Use dual welding machines to weld synchronously to complete the welds between the intermediate body and one side of the wing plate; Use the intermediate assembly tool to flip the two single pieces 180 degrees at the same time, lift the flip lug at one end, and use the two transition fulcrum lugs at the bottom as flip transition fulcrums to flip; After flipping, dual welding machines are used to weld the seams between the intermediate body and the other side of the wing plate synchronously; After the wing panels are welded, assemble the footrests according to the dimensions on the drawing. After the footrests are welded, turn them 180° and install and weld the other footrests again. After welding is completed, the two pieces of the machine base are separated from the tooling and subjected to VT, MT, and UT inspections. After passing the inspections, they are transferred to the machine base assembly process.
10. The welding method for a single-piece assembly process of a marine engine base according to claim 9, characterized in that: The dual-welder synchronous welding method is specifically as follows: two parallel welding tracks are arranged on both sides of the intermediate body; a first welder and a second welder are respectively arranged on the two welding tracks to weld the intermediate body and the two side wing plates.