A method for welding a single-piece bottom plate of a marine diesel engine frame

Abstract

The invention discloses a method for welding a single-piece bottom plate of a marine diesel engine frame, which solves the problem of serious deformation of a single piece of a marine diesel engine frame after welding in the prior art and has the beneficial effect of effectively controlling welding deformation. The specific scheme is as follows: A method for welding a single-piece bottom plate of a marine diesel engine frame comprises welding a weld between a bottom plate and a wing plate in sections and batches, wherein the weld between the bottom plate and the wing plate is divided into at least three sections: welding a second section where the bottom plate contacts the wing plate, the second section being located on the inner side of a contact position between a triangle plate and the bottom plate, the length of the second section being greater than the length of a fourth section, the fourth section being the projected length of the longest contact line segment between the triangle plate and the bottom plate on the wing plate; welding the bottom plate and the triangle plate; and after the marine diesel engine frame is assembled, welding a first section where the bottom plate contacts the wing plate, wherein the first section, the second section and the third section are sequentially arranged along the length direction of the bottom plate.

Description

Technical Field

[0001] The invention relates to the field of marine diesel engines, in particular to a method for welding a single-piece bottom plate of a marine diesel engine frame. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Marine diesel engine frame has a single piece, reference Figure 1 As shown, the single piece includes a web, a guide plate, a triangular plate, a wing plate and a bottom plate. The traditional welding method for the bottom plate is: after all the front welds are welded, the welds on the back are turned over and welded. The inventor found that such a welding method causes serious deformation of the single piece after welding, and the bottom plate needs to be flame-shaped, resulting in problems such as high labor time consumption and low production efficiency. Moreover, the bottom plate and the triangular plate also need to be welded. There is a problem of needing to adjust the shape when welding the wing plate and the bottom plate first. If the bottom plate and the triangular plate are welded first, it will affect the welding of the wing plate and the bottom plate.

[0004] Taking a certain model as an example, there are two bottom plates on both sides of a single piece (located on the bottom side of the wing plate, with a length less than the width of the wing plate). It takes about 40 minutes to adjust the shape after welding. A frame has a total of 7 single pieces and 14 small bottom plates. The total adjustment time is about 280 minutes, resulting in waste of manufacturing costs and extended production cycle. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a method for welding a single-piece bottom plate of a marine diesel engine frame, improve the single-piece bottom frame welding method, and help improve production efficiency, control welding deformation, and effectively reduce energy consumption.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] A method for welding a single-piece bottom plate of a marine diesel engine frame, wherein the weld between the bottom plate and the wing plate is welded in sections and batches, and the weld between the bottom plate and the wing plate is divided into at least three sections:

[0008] The second section of the welded base plate in contact with the wing plate is located inside the contact position between the triangle plate and the base plate. The length of the second section is greater than the length of the fourth section. The fourth section is the projection length of the longest contact line segment between the triangle plate and the base plate on the wing plate.

[0009] Welding base plate and triangle plate;

[0010] After the marine diesel engine frame is assembled, the first section where the bottom plate contacts the wing plate is welded, and the first section, the second section and the third section are sequentially arranged along the length direction of the bottom plate.

[0011] The welding method described above divides the contact position between the base plate and the wing plate into multiple sections. The second section is welded first, and then the first section is welded. The segmented welding does not need to be flipped for welding, which reduces the welding heat input and controls the welding deformation, thereby eliminating the flame shaping process after welding the single small base plate.

[0012] In the above-mentioned method for welding a single-piece bottom plate of a marine diesel engine frame, the bottom plate is divided into the first section, the second section and the third section from one end adjacent to the guide rail plate to the other end.

[0013] In the above-mentioned method for welding a single-piece bottom plate of a marine diesel engine frame, considering the contact length between the triangle plate and the bottom plate, the length of the second section is greater than the length of the first section.

[0014] In the above-mentioned method for welding a single-piece bottom plate of a marine diesel engine frame, the length of the third section is less than, greater than, or equal to the length of the first section, and the length of the third section is determined according to the length of the engine model.

[0015] In the above-mentioned method for welding a single-piece bottom plate of a marine diesel engine frame, the length of the second section is between 200-300 mm.

[0016] In the above-described method for welding a single-piece bottom plate of a marine diesel engine frame, the number of welding layers is different when welding the first section and the second section. In this way, different welding depths are used for the three welds, and the different weld lengths of the three sections are combined. While ensuring the welding quality, the welding cost is controlled, and the welding deformation of the bottom plate is effectively achieved to be zero.

[0017] In the above-mentioned method for welding a single-piece bottom plate of a marine diesel engine frame, the number of welding layers of the second section is greater than the number of welding layers of the first section, thereby ensuring the reliability of the connection between the bottom plate and the wing plate.

[0018] In the above-mentioned method for welding a single-piece bottom plate of a marine diesel engine frame, the number of welding layers of the second section is three layers until the cover surface is completed.

[0019] In the above-mentioned method for welding a single-piece bottom plate of a marine diesel engine frame, the second section plays the main role of connecting the wing plate and the bottom plate, and the first section plays an auxiliary role of connection. The number of welding layers of the first section is one.

[0020] In the above-mentioned method for welding a single-piece bottom plate of a marine diesel engine frame, the welding of the first section and the second section is sufficient to ensure the connection strength between the wing plate and the bottom plate, and the number of welding layers of the third section is zero.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1) The present invention provides a welding method to divide the contact position between the base plate and the wing plate into multiple sections. The second section is welded first, and then the first section is welded. The segmented welding does not need to be flipped for welding, which reduces the welding heat input and controls the welding deformation. Therefore, the flame shaping process after welding the single small base plate is eliminated, which reduces labor time consumption and energy waste, improves production efficiency, controls welding deformation, and effectively reduces energy consumption.

[0023] 2) In the present invention, the second section between the bottom plate and the wing plate is welded first, and then the triangle plate and the bottom plate are welded. This eliminates the need for welding and shaping, and the welding of the triangle plate and the bottom plate will not affect the welding of the bottom plate and the wing plate.

[0024] 3) In the present invention, the length of the second section (the second section weld) is set to be greater than the length of the first section (the first section weld), and the length of the third section (the third section weld) is determined according to the model of the diesel engine. Under the premise of ensuring the reliability of the connection between the bottom plate and the wing plate, the third section does not need to be welded, further reducing the manual workload and controlling production costs.

[0025] 4) The present invention adopts different welding depths in the three weld sections and different weld lengths in the three weld sections, thereby controlling welding costs while ensuring welding quality and effectively achieving zero welding deformation of the base plate.

[0026] 5) The present invention welds the second section in advance, which will not affect the welding of the triangle plate and the base plate. After the triangle plate and the base plate are welded, the first section is welded after the frame is assembled (after the single piece is connected with other components to form a better structure). The third section is not welded, so no shape adjustment is required after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] Figure 1 It is a three-dimensional diagram of a single piece of a diesel engine frame in the prior art.

[0029] Figure 2 The figure is a schematic diagram of a method for welding a single-piece bottom plate of a marine diesel engine frame according to one or more embodiments of the present invention.

[0030] Figure 3 The present invention is a schematic diagram of a completed frame in a method for welding a single-piece bottom plate of a marine diesel engine frame according to one or more embodiments of the present invention.

[0031] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0032] Among them: 1. Guide plate, 2. Web plate, 3. Bottom plate, 4. Wing plate, 5. Triangular plate, 6. First section, 7. Second section, 8. Third section. DETAILED DESCRIPTION

[0033] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise clearly indicated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprising" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations;

[0035] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0036] Explanation of terms: The terms "install", "connect", "connect", "fix" and the like in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection, a direct connection, or an indirect connection through an intermediate medium, an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0037] As described in the background art, the prior art has the problem that the bottom plate is severely deformed after welding and needs to be adjusted. In order to solve the above technical problem, the present invention proposes a method for welding a single-piece bottom plate of a marine diesel engine frame.

[0038] In a typical embodiment of the present invention, reference is made to Figure 2 As shown, a method for welding a single-piece bottom plate of a marine diesel engine frame is provided, wherein the weld between the bottom plate 3 and the wing plate 4 is welded in sections and batches: the weld between the bottom plate 3 and the wing plate 4 is divided into at least three sections, including a first section, a second section, and a third section arranged in sequence;

[0039] Weld the second section where the base plate 3 contacts the wing plate 4. The second section is located inside the contact position between the triangle plate 5 and the base plate 3. The length of the second section 7 (weld length) is greater than the length of the fourth section. The fourth section is the projection length of the longest contact line between the triangle plate and the base plate on the wing plate 4.

[0040] Weld the bottom plate 3 and the triangle plate 5, first weld the second section, so that there will be no interference caused by welding the triangle plate and the bottom plate first and then welding the wing plate and the bottom plate;

[0041] Finally, reference Figure 3 As shown, after the marine diesel engine frame is assembled, the first section 6 where the bottom plate 3 contacts the wing plate 4 is welded. The first section 6 , the second section 7 and the third section 8 are sequentially arranged along the length direction of the bottom plate 3 .

[0042] It should be explained that one end of the triangle plate is welded to the base plate, and the end of the triangle plate welded to the base plate is in the shape of a triangle.

[0043] Specifically, the bottom plate 3 is divided into a first section 6 , a second section 7 and a third section 8 from one end adjacent to the guide rail plate 1 to the other end.

[0044] Taking into account the contact length of the triangle plate 5 with the base plate 3 and ensuring the reliability of the connection between the middle section of the base plate and the bottom end of the wing plate, the length of the second section 7 is greater than that of the first section 6. In some examples, the length of the second section is at least 100 mm greater than that of the first section.

[0045] In this embodiment, the length of the third section 8 is determined according to the length of the diesel engine model. Different models have different bottom plate lengths. Since there are multiple options for engine models, the length of the third section 8 is less than, greater than, or equal to the length of the first section 6.

[0046] Similarly, the length of the second section 7 is determined according to the machine model. The length of the second section 7 is between 200-300 mm. The larger the volume of the machine model, the longer the length of the second section (the second section weld).

[0047] In addition, the number of welding layers when welding the first section 6 and the second section 7 is different. In this way, the three sections of welds use different welding depths, which are combined with the different weld lengths of the three sections to ensure welding quality and control welding costs. After the diesel engine frame is assembled and the single piece is connected to other components to form a structure with good rigidity, the first section is welded. No shape adjustment is required after welding, effectively achieving zero welding deformation of the base plate.

[0048] It should be explained that the number of welding layers of the second section 7 is greater than that of the first section 6 , so as to ensure the reliability of the connection between the bottom plate and the wing plate.

[0049] In this embodiment, the weld seam of the second section primarily connects the wing panel to the base plate, while the weld of the first section serves as a secondary connection. Specifically, the second section 7 is welded in three layers until the cover is complete, while the first section 6 is welded in two or one layers, preferably one layer. In some examples, the welds of the first and second sections are sufficient to ensure the connection strength between the wing panel and the base plate, so the third section is welded in zero layers, meaning no welding is required. This omission of welding in the third section further shortens the welding time between the base plate and the wing panel, further improving work efficiency.

[0050] In addition, in other examples, the weld between the bottom plate and the wing plate is divided into multiple sections, the first section and the second section are the same, and the third section can be divided into two sections, the section adjacent to the second section is welded, and the section away from the second section is also not welded.

[0051] The welding method provided in this embodiment divides the contact position between the base plate and the wing plate into multiple sections. The second section is welded first, and then the first section is welded. The segmented welding does not need to be flipped for welding, which reduces the welding heat input and controls the welding deformation, thereby eliminating the flame shaping process after the single-piece base plate welding. The time and labor costs are effectively controlled, the labor time consumption and energy waste are reduced, the production efficiency is improved, the welding deformation is controlled, and the energy consumption is effectively reduced.

[0052] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for welding a single-piece bottom plate of a marine diesel engine frame, characterized in that: The welds between the bottom plate and the wing plate are welded in sections and batches. The welds between the bottom plate and the wing plate are divided into at least three sections: The second section of the welded base plate in contact with the wing plate is located inside the contact position between the triangle plate and the base plate. The length of the second section is greater than the length of the fourth section. The fourth section is the projection length of the longest contact line segment between the triangle plate and the base plate on the wing plate. Welding base plate and triangle plate; After the marine diesel engine frame is assembled, the first section where the bottom plate contacts the wing plate is welded, and the first section, the second section, and the third section are sequentially arranged along the length direction of the bottom plate; The bottom plate is divided into the first section, the second section and the third section in sequence from one end adjacent to the guide rail plate to the other end.

2. A method for welding a single-piece bottom plate of a marine diesel engine frame according to claim 1, characterized in that: The length of the second segment is greater than the length of the first segment.

3. A method for welding a single-piece bottom plate of a marine diesel engine frame according to claim 1, characterized in that: The length of the third segment is less than, greater than, or equal to the length of the first segment.

4. A method for welding a single-piece bottom plate of a marine diesel engine frame according to claim 1, characterized in that: The length of the second section is between 200-300 mm.

5. A method for welding a single-piece bottom plate of a marine diesel engine frame according to claim 1, characterized in that: The number of welding layers of the first section and the second section is different when welding.

6. A method for welding a single-piece bottom plate of a marine diesel engine frame according to claim 1 or 5, characterized in that: The number of welding layers in the second section is greater than the number of welding layers in the first section.

7. A method for welding a single-piece bottom plate of a marine diesel engine frame according to claim 1 or 5, characterized in that: The number of welding layers in the second section is three until the cover surface is completed.

8. A method for welding a single-piece bottom plate of a marine diesel engine frame according to claim 1 or 5, characterized in that: The number of welding layers in the first section is one.

9. A method for welding a single-piece bottom plate of a marine diesel engine frame according to claim 1, characterized in that: The number of welding layers in the third section is zero.

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