A method for assembling and welding a double-fuel diesel engine frame single piece and the frame single piece

Abstract

The present application relates to a kind of dual-fuel diesel engine rack single piece assembly welding method and rack single piece, comprising the following steps: the assembly welding first side component: first wing plate of first side component is welded with first bearing block, then first wing plate is flame leveled, the second wing plate of first side component, baffle and first wing plate are assembled with guide rail plate and then welded and fixed;Assembly welding middle component: second bearing block is welded and fixed with web, web is flame leveled;Assembly welding second side component: wing plate of second side component, baffle and guide rail plate are assembled and then welded and fixed;Folding assembly welding: middle component, first side component and second side component are welded and fixed, the assembly welding of rack single piece is completed, and the assembly welding quality of rack single piece containing bearing block is guaranteed using the method of the present application.

Description

Technical Field

[0001] This invention relates to the field of diesel engine processing technology, specifically to a method for welding a single piece of frame for a dual-fuel diesel engine and the single piece of frame. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] The dual-fuel diesel engine frame, a crucial component connecting the base and cylinder block, bears the dynamic load of the engine crankshaft connecting rod mechanism. Therefore, the welding quality of the frame plays a vital role in the engine's lifespan. Currently, there is a dual-fuel diesel engine frame with dimensions of 16210mm in length, 5660mm in width, and 4950mm in height. It is bulky and has strict dimensional requirements. It consists of 11 individual pieces, accounting for 2 / 3 of the welding production cycle. Each piece of this frame contains a bearing block made of ZG200-400 cast steel. In traditional frame assembly methods, all pieces are shaped after welding. However, when applied to the above-mentioned frame, the bearing blocks prevent the shaped blocks from being adjusted to the target requirements after welding. Therefore, there is an urgent need for a welding method for the aforementioned dual-fuel diesel engine frame containing bearing blocks. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a method for welding a single frame piece of a dual-fuel diesel engine and a single frame piece, which ensures the welding quality of the frame piece with bearing blocks.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, embodiments of the present invention provide a method for welding a single piece of a dual-fuel diesel engine frame. The frame consists of a central assembly, a first side assembly located on one side of the central assembly, and a second side assembly located on the other side of the central assembly. The central assembly includes a web and a first bearing block. The first and second side assemblies include two parallel wing plates with a partition between them. The wing plates are fixed to a guide rail plate, and the guide rail plate is fixed to the web. The wing plate of the first side assembly is provided with a second bearing block. The welding method includes the following steps: Assemble and weld the first side assembly: weld the first wing plate of the first side assembly to the first bearing block, then flame level the first wing plate, assemble the second wing plate, partition plate and the first wing plate of the first side assembly to the guide rail plate and then weld and fix them. Welding of the middle component: Weld the second bearing block to the web plate and fix it in place, and then perform flame leveling on the web plate; Assemble and weld the second side assembly: Assemble the wing plate, partition plate and guide rail plate of the second side assembly and then weld them in place; Assembly and welding: The middle component, the first side component and the second side component are assembled and fixed by welding to complete the assembly and welding of the frame piece.

[0006] Optionally, when assembling and welding the first side component, the first wing plate is flame leveled until the flatness of the first wing plate is no more than 3mm.

[0007] Optionally, when assembling the first side component, the first bearing block is preheated to 75℃-85℃ and then fixed to the first wing plate by symmetrical welding.

[0008] Optionally, when assembling the first side component, UT and MT inspections shall be carried out 24 hours after the first bearing block and the first wing plate are welded. If the inspection is qualified, flame leveling shall be performed; otherwise, repair shall be carried out until the UT and MT inspections are qualified.

[0009] Optionally, when assembling and welding the middle components, the web plate is flame-leveled until the flatness of the web plate is no more than 2mm.

[0010] Optionally, when assembling the middle component, the second bearing block is preheated to 75℃-85℃ and then the web plate is welded and fixed to the second bearing block using a symmetrical welding method.

[0011] Optionally, when assembling the middle components, UT and MT inspections should be carried out 24 hours after the second bearing block is welded to the web. If the inspection is qualified, flame leveling should be performed; otherwise, repair treatment should be carried out until the UT and MT inspections are qualified.

[0012] Optionally, during the assembly welding, the first side component, the second side component, and the middle component are first positioned and welded, then the root welding is performed, and finally the fill welding is performed. After assembling the individual small parts, the weld seam is trimmed and polished.

[0013] Optionally, after the frame pieces are welded together, the welded frame pieces are subjected to stress-relieving annealing to complete the finished frame pieces.

[0014] Secondly, embodiments of the present invention provide a single piece of dual-fuel diesel engine frame, which is assembled and welded using the single-piece welding method for dual-fuel diesel engine frame described in the first aspect.

[0015] The beneficial effects of this invention are as follows: The present invention provides a single-piece welding method for a dual-fuel diesel engine frame. The first side assembly, the middle assembly, and the second side assembly are welded separately and then joined together. When welding the first side assembly, the first bearing block is welded to the first wing plate and then flame leveled. When welding the middle assembly, the second bearing block is welded to the web plate and then flame leveled. This ensures the flatness of the wing plate and the web plate, eliminating the need for flame leveling after welding all three components. This ensures the welding quality of the single piece and meets the welding requirements of a single piece of a dual-fuel diesel engine frame containing bearing blocks. Attached Figure Description

[0016] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0017] Figure 1 This is a schematic diagram of the single-piece frame structure of Embodiment 1 of the present invention; Figure 2 This is a flowchart of the welding method according to Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of segment a structure in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the segmented C structure of Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of segment B structure in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the segmented D structure of Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the welding assembly in Embodiment 1 of the present invention; Among them, 1. First wing plate, 2. Second wing plate, 3. Partition plate, 4. First guide rail plate, 5. First bearing block, 6. Web plate, 7. Second bearing block, 8. Second guide rail plate, 9. Partition plate, 10. Wing plate. Detailed Implementation Example 1 This embodiment provides a method for welding a single piece of a dual-fuel diesel engine frame, such as... Figure 1 As shown, the dual-fuel diesel engine frame is a 9X92DF-2.0-iCER dual-fuel diesel engine frame. The frame includes a central assembly, a first side assembly located on one side of the central assembly, and a second side assembly located on the other side of the central assembly. The first side assembly includes two parallel wing plates, defined as a first wing plate 1 and a second wing plate 2. A partition 3 is provided between the first wing plate 1 and the second wing plate 2. The inner edges of the first wing plate 1 and the second wing plate 2 are fixedly connected to a first guide rail plate 4. A first bearing block 5 is provided on the wing plate 1. The middle component includes a web plate 6. A second bearing block 7 is fixed to the bottom end of the web plate 6. One side edge of the web plate 6 is fixedly connected to the first guide rail plate 4 of the first side component. The second side component has the same structure as the first side component, except that the wing plate of the second side component does not have a first bearing block. The second side component includes two parallel wing plates 10. The inner edges of the two wing plates 10 are fixed to the second guide rail plate 8. The second guide rail plate 8 is fixed to the other side edge of the web plate. A partition plate 9 is provided between the two wing plates.

[0018] The above structure can be achieved using existing technology, and its further technical details will not be described in detail here. Figure 2 As shown, the welding method for assembling a single piece of the dual-fuel diesel engine frame includes the following specific steps: Step 1: Assemble and weld the first side assembly, which specifically includes the following steps: Step 1.1: The first bearing block 5 is made of ZG200-400 cast steel. The maximum thickness of the first bearing block 5 is 160mm. Before welding the first bearing block, the first bearing block is preheated to 75℃-85℃, preferably 80℃. The preheating method can use existing technology and will not be described in detail here.

[0019] Step 1.2: As Figure 3 As shown, taking the first wing plate 1 as a reference (that is, fixing the first wing plate 1 and hoisting the first bearing block 5), after assembling the first bearing block 5 with the first wing plate 1, the first bearing block 5 is welded onto the first wing plate 1. First, the first wing plate 1 and the first bearing block 5 are fixed by positioning welding (spot welding). After the first wing plate 1 and the first bearing block 5 are fixed by positioning welding and spot welding, the first wing plate 1 and the first bearing block 5 are then welded and fixed. Circular welds are used for welding and a symmetrical welding method is used. The symmetrical welding method can use existing technology and will not be described in detail here.

[0020] Step 1.3: 24 hours after tack welding, perform UT and MT inspections on the weld according to the ISO 5817-C welding standard. Existing technologies can be used for UT and MT inspections, which will not be described in detail here. If the inspection results are unqualified, the weld should be repaired until the inspection results are qualified. Existing methods can be used for repair, which will not be described in detail here. If the inspection results are qualified, proceed to the next step.

[0021] Step 1.4: After the welding inspection is qualified, flame shaping is performed on the first wing plate 1 until the flatness of the first wing plate 1 is no more than 3mm.

[0022] The method for flame shaping can be achieved using existing technology, and will not be described in detail here.

[0023] After the flame shaping of the first wing plate 1 is completed, segment a of the frame single piece is formed.

[0024] Step 1.5: As Figure 4As shown, using the first guide rail plate 4 as a reference (the first guide rail plate 4 is fixed), segment a, the second wing plate 2, and the partition plate 3 are hoisted and assembled. After assembly, segment a, the second wing plate 2, and the partition plate 3 are positioned and fixed by spot welding. Multiple supports are welded between the first wing plate 1 and the second wing plate 3 to prevent deformation, effectively controlling the deformation of single-piece welding and meeting the ISO13920 tolerance requirements. Then, segment a, the second wing plate 3, the partition plate 3, and the first guide rail plate 4 are welded and fixed.

[0025] After step 1.5 is completed, segment C of the rack unit is obtained.

[0026] Step 2: Assemble and weld the middle components, including the following specific steps: Step 2.1: Preheat the second bearing block 7. The second bearing block 7 is made of ZG200-400 cast steel material, and its maximum thickness is 340mm. Preheat the second bearing block 7 to 75℃-85℃, preferably to 80℃.

[0027] Step 2.2, as follows Figure 5 As shown, with the web plate 6 as the reference (fixing the web plate), the second bearing block 7 is hoisted. After the web plate 6 and the second bearing block 7 are assembled in place, the web plate 6 and the second bearing block 7 are tack welded. The web plate 6 and the second bearing block 7 are positioned and fixed by tack welding. Then, the web plate 6 and the second bearing block 7 are welded and fixed by symmetrical welding method to control welding deformation. The symmetrical welding method can use existing technology and will not be described in detail here.

[0028] Step 2.3: 24 hours after welding, perform UT and MT inspections on the weld in accordance with the ISO 5817-C welding standard. Existing technologies can be used for UT and MT inspections, which will not be described in detail here.

[0029] If the inspection results are unsatisfactory, the weld should be repaired until the inspection results are satisfactory. Existing technologies can be used for the repair, which will not be described in detail here.

[0030] If the test results are satisfactory, proceed to the next step.

[0031] Step 2.4: Flame-shape the web plate 6 until the flatness of the web plate 6 is no more than 2mm.

[0032] The method for flame shaping can be achieved using existing technology, and will not be described in detail here.

[0033] After step 2.4 is completed, segment B of the rack unit is obtained.

[0034] Step 3: Weld the second side assembly together. The specific method is as follows: like Figure 6 As shown, with the second guide plate 8 as the reference (the second guide plate 8 is fixed), the two wing plates 10 and the partition plate 9 of the second side component are hoisted. The second guide plate 8, the two wing plates 10 and the partition plate 9 are assembled. Then, the second guide plate 8, the two wing plates 10 and the partition plate 9 are tack welded to fix them in place. Then, multiple supports are welded between the two wing plates 10 to prevent the wing plates from deforming, effectively controlling the deformation of the single piece welding, and meeting the ISO13920 tolerance requirements. Then, the two wing plates 10 are welded and fixed to the second guide plate 8 and the partition plate 9. At this time, the segment D of the single piece of the frame is obtained.

[0035] Step 4: Joining and welding like Figure 7 As shown, with segment B as the reference (segment B remains fixed), segments C and D are hoisted and assembled. Then, one side of the web plate 6 and the second bearing block 7 of segment B is tack welded to the first guide rail plate 4 of segment C, i.e., spot welded for fixation. The other side of the web plate 6 and the second bearing block 7 of segment B is tack welded to the second guide rail plate 8 of segment D, i.e., spot welded for fixation.

[0036] After segment B, segment C and segment D are spot welded and fixed, the weld seams are sequentially subjected to root pass welding and filler welding to form a single frame piece.

[0037] The frame pieces are flipped over, and the smaller parts of the pieces are welded together to form a single piece.

[0038] After the single piece is processed as a whole, the weld seam is trimmed and polished, and the appearance is cleaned to form a finished single piece. At this point, the assembly welding of the single piece is completed.

[0039] Step 5: Perform stress-relieving annealing on the assembled pieces. Existing technology can be used for the annealing process, which will not be described in detail here.

[0040] Step 6: After stress-relieving annealing, the weld seams of individual pieces are subjected to UT, MT and scribing inspections. If they pass the inspection, they are transferred to the next process. If they fail the inspection, certain repair measures are taken until they pass the inspection and then they are transferred to the next process. The repair measures can use existing technology and will not be described in detail here.

[0041] Using the assembly welding method of this embodiment, the first side component, the middle component, and the second side component are assembled and welded separately before being joined together. When assembling the first side component, the first bearing block is welded to the first wing plate and then flame leveled. When assembling the middle component, the second bearing block is welded to the web plate and then flame leveled. This ensures the flatness of the wing plate and the web plate, eliminating the need for flame leveling after the three components are assembled and welded. This ensures the assembly welding quality of a single piece and meets the assembly welding requirements of a single piece of a dual-fuel diesel engine frame containing bearing blocks.

[0042] Meanwhile, the two bearing blocks are welded separately with the first side component and the middle component, instead of welding the bearing blocks after all components are welded. This makes it easier to position the bearing blocks during welding, ensuring the ISO 5817-C grade welding quality of the frame bearing blocks, greatly reducing labor time and improving frame production efficiency.

[0043] Example 2 This embodiment provides a single piece of dual-fuel diesel engine frame, which is welded using the single-piece welding method for dual-fuel diesel engine frame described in Embodiment 1.

[0044] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for welding a single-piece frame of a dual-fuel diesel engine, wherein the single-piece frame comprises a central assembly, a first side assembly located on one side of the central assembly, and a second side assembly located on the other side of the central assembly. The central assembly includes a web and a first bearing block. The first and second side assemblies each include two wing plates, a partition is provided between the wing plates, the wing plates are fixed to a guide rail plate, and the guide rail plate is fixed to the web. The wing plate of the first side assembly is provided with a second bearing block. The assembly welding method includes the following steps: Assemble and weld the first side assembly: weld the first wing plate of the first side assembly to the first bearing block, then flame level the first wing plate, assemble the second wing plate, partition plate and the first wing plate of the first side assembly to the guide rail plate and then weld and fix them. Welding of the middle component: Weld the second bearing block to the web plate and fix it in place, and then perform flame leveling on the web plate; Assemble and weld the second side assembly: Assemble the wing plate, partition plate and guide rail plate of the second side assembly and then weld them in place; Assembly and welding: The middle component, the first side component and the second side component are assembled and fixed by welding to complete the assembly and welding of the frame piece; When welding the first side component, UT and MT inspections are carried out 24 hours after the first bearing block and the first wing plate are welded. If the inspection is qualified, flame leveling is carried out; otherwise, repair is carried out until the UT and MT inspections are qualified. When welding the middle component, 24 hours after the second bearing block and web plate are welded together, UT and MT inspections are carried out. If the inspection is qualified, flame leveling is performed; otherwise, repair is carried out until the UT and MT inspections are qualified.

2. The method for welding a single piece of a dual-fuel diesel engine frame as described in claim 1, characterized in that, When welding the first side component, the first wing plate is flame leveled until the flatness of the first wing plate is no more than 3mm.

3. The method for welding a single piece of a dual-fuel diesel engine frame as described in claim 1, characterized in that, When assembling the first side component, the first bearing block is preheated to 75℃-85℃ and then fixed to the first wing plate by symmetrical welding.

4. The method for welding a single piece of a dual-fuel diesel engine frame as described in claim 1, characterized in that, When assembling and welding the middle components, the web plate is flame-leveled until the flatness of the web plate is no more than 2mm.

5. The method for welding a single piece of a dual-fuel diesel engine frame as described in claim 1, characterized in that, When assembling the middle component, the second bearing block is preheated to 75℃-85℃ and then the web plate is welded and fixed to the second bearing block using a symmetrical welding method.

6. The method for welding a single piece of a dual-fuel diesel engine frame as described in claim 1, characterized in that, During the assembly and welding process, the first side component, the second side component, and the middle component are first positioned and welded, then the root welding is performed, and finally the fill welding is performed. After assembling the individual small parts, the weld seams are trimmed and polished.

7. The method for welding a single piece of a dual-fuel diesel engine frame as described in claim 1, characterized in that, After the frame pieces are welded together, they are subjected to stress-relieving annealing to complete the finished frame pieces.

8. A single-piece frame for a dual-fuel diesel engine, characterized in that, It is assembled and welded using the single-piece welding method for the dual-fuel diesel engine frame as described in any one of claims 1-7.

Images