A method for manufacturing a carriage and an assembly process

Abstract

The present invention discloses a method for manufacturing and assembling a carriage, which has the following manufacturing steps: determining the front panel, rear door panel, top panel, bottom panel, left side panel and right side panel according to the design drawings, and cutting the fiberglass panels, Q460 steel plates and aluminum-lithium alloy plates into the shapes of the front panel, rear door panel, top panel, bottom panel, left side panel and right side panel. In the present invention, by designing metal vertical bars arranged at equal distances on the carriage panel, on the basis of enhancing the lateral impact resistance of the carriage panel, the metal vertical bars at both ends of the carriage panel cooperate with each other, and the assembly of the carriage panel can be achieved by screwing nuts on stud bolts; at the same time, nitrile and silicone rubber material plates are attached to the inner side of the carriage panel, and the damping effect of the nitrile and silicone rubber material plates is utilized to absorb energy so that the carriage panel has damping effects such as vibration reduction and noise reduction, and then resin glue is poured to fill the gaps in the carriage panel, thereby achieving the effect of sealing and firming the carriage panel.

Description

Technical Field

[0001] The present invention relates to the technical field of carriage panel manufacturing and assembly, and in particular to a carriage manufacturing method and assembly process. Background Art

[0002] Carriage panels are used for different types of vehicles such as rail trains, passenger cars, trucks, special vehicles, etc. According to their functional characteristics, there are anti-slip car panels, anti-fire car panels, and waterproof car panels. According to the characteristics of the wood, there are birch car panels, beech car panels, etc. Some are used in the position of the ceiling, some are used in the position of the side box, and some are used in the position of the floor. The existing car panels used for transport vehicles must cope with multiple environments, multiple climates, and multiple road conditions. Multiple environments, multiple climates, and multiple road conditions have higher requirements on the high hardness, high strength and corrosion resistance of the car panels. At the same time, reliable car sealing is also an important aspect of the car. For this reason, a car manufacturing method and assembly process are proposed. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for manufacturing a carriage and an assembly process to solve the above-mentioned deficiencies in the technology.

[0004] In order to achieve the above-mentioned object, the present invention provides the following technical solution: a method for manufacturing a carriage and an assembly process, wherein the manufacturing method includes the following manufacturing steps:

[0005] S1: Determine the front panel, rear door panel, top panel, bottom panel, left side panel and right side panel according to the design drawings, and cut the fiberglass panels, Q460 steel plates and aluminum-lithium alloy plates into the shapes of the front panel, rear door panel, top panel, bottom panel, left side panel and right side panel;

[0006] S2: The car body panel material cut in S1 is pre-pressed into three layers with an aluminum-lithium alloy plate in the middle, and fiberglass panels and Q460 steel plates at the upper and lower positions, and stacked. The pre-pressed material is heat-treated and heated, and the punching machine is pressurized to punch the heat-treated material using the punching machine;

[0007] S3: The front panel, rear door panel, top panel, bottom panel, left panel and right panel stamped in S2 are stacked and placed for cooling, and nitrile and silicone rubber material sheets are attached to the inner side of the car body panel. After completion, resin glue is poured to fill the gaps in the car body panel.

[0008] S4: The material after filling the gap in S3 is pressed again into the carriage panel using a punching machine with positive pressure, so that the resin glue and the side wall of the material sandwich are tightly fitted, and then the carriage panel is left to stand and wait for the resin glue in the carriage panel to solidify. After trimming the burrs, the carriage panel is obtained.

[0009] As a preferred solution of the present invention, the Q460 steel plate is a high-strength steel plate with low welding crack sensitivity and a thickness of 5 mm to 100 mm in accordance with the standard YB / T4137-2013.

[0010] As a preferred solution of the present invention, the resin glue adopts any one or a combination of two or more of the epoxy modified corrosion-resistant resin glue with model number 197E#, the corrosion-resistant shaped resin glue with model number 3301A#, the low shrinkage resin glue with model number 196-P# or the para-phenylene heat-resistant resin glue with model number 199A#.

[0011] As a preferred solution of the present invention, the Q460 steel plate is located between the fiberglass reinforced plastic panel and the aluminum-lithium alloy plate, and is located on the inner side of the car body panel, and the aluminum-lithium alloy plate is located on the outer side of the car body panel.

[0012] As a preferred solution of the present invention, the curing and molding process in step S4 can be carried out by natural cooling and curing or low-temperature cooling and curing, wherein the low-temperature cooling and curing can be carried out by contact ice cooling, water cooling and vacuum cooling.

[0013] A car body assembly process includes the following processes and steps:

[0014] ① Place the carriage assembly rack on a horizontal surface, and pre-place the front panel, rear door panel, top panel, bottom panel, left panel, and right panel on the six surfaces of the assembly rack one by one;

[0015] ② Adjust the placement of the carriage panels in step ①, and then use stainless steel screws to fasten the carriage panels placed on the assembly frame;

[0016] ③ Fill the unsaturated resin glue into the joints of the car body panels after tightening in ②, and wait for the unsaturated resin glue to solidify after standing for 24-36 hours;

[0017] ④Install accessories on the car body panel.

[0018] As a preferred solution of the present invention, the unsaturated resin glue is any one of a low water absorption unsaturated polyester resin and a low volatility resin.

[0019] As a preferred solution of the present invention, it also includes a car panel structure, wherein the car panel structure includes a car panel, a support block, a protruding side, a recessed side, a first nut, a second nut and a double-section bolt. The car panel structure is composed of two or more car panels spliced ​​together, and the support blocks are arranged in an array on the back of the car panel in an equidistant manner, and the protruding side and the recessed side are arranged at both ends of the car panel. The protruding side and the recessed side can cooperate with each other and overlap, and the double-section bolt passes through the overlapping part of the protruding side and the recessed side, and the first nut and the second nut are sleeved on the outer ring of the double-section bolt located outside the protruding side and the recessed side.

[0020] As a preferred solution of the present invention, the double-section bolt has two sections of threads, and the thread directions of the two sections are opposite. The thread directions inside the first nut and the second nut are also opposite, and cooperate with the threads on the double-section bolt.

[0021] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0022] In the present invention, by designing metal vertical bars arranged at equal distances on the car body panel, on the basis of enhancing the lateral impact resistance of the car body panel, the metal vertical bars at both ends of the car body panel cooperate with each other, and the car body panel can be assembled by means of nuts on stud bolts; and the high strength, high hardness and high corrosion resistance of the fiberglass panel, Q460 steel plate and aluminum-lithium alloy plate are utilized to enhance the overall strength and hardness of the car body panel, and at the same time, nitrile and silicone rubber material plates are attached to the inner side of the car body panel, and the damping effect of the nitrile and silicone rubber material plates is utilized to absorb energy so that the car body panel has damping effects such as vibration reduction and noise reduction, and then the gaps in the car body panel are filled with resin glue, which has the effect of sealing and strengthening the car body panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0024] Figure 1 This is a schematic structural diagram of the process of a method for manufacturing a carriage proposed by the present invention;

[0025] Figure 2 This is a structural diagram of the assembly process of a carriage proposed by the present invention;

[0026] Figure 3 This is a schematic diagram of the carriage plate structure proposed by the present invention;

[0027] Figure 4This is a schematic diagram of the structure of a single-piece carriage panel proposed in the present invention;

[0028] Figure 5 This is a schematic diagram of the top view of the carriage plate structure proposed by the present invention;

[0029] Figure 6 The present invention proposes Figure 5 Schematic diagram of the partially enlarged structure of part A.

[0030] Attachment Figure 3 To the attached Figure 6 Reference numerals in the figures:

[0031] 1. Carriage plate; 2. Support block; 3. Protruding side; 4. Recessed side; 5. First nut; 6. Second nut; 7. Double-section bolt. DETAILED DESCRIPTION

[0032] In order to more clearly explain and illustrate the technical solution and implementation of the present invention, several preferred specific embodiments for implementing the technical solution of the present invention are introduced below.

[0033] The following description is merely exemplary in nature and is not intended to limit the present disclosure, its applications and uses. It should be understood that in all of these figures, the same or similar reference numerals indicate the same or similar parts and features. The various figures only schematically represent the concepts and principles of the embodiments of the present disclosure and do not necessarily show the specific dimensions and proportions of the various embodiments of the present disclosure. Specific parts in specific figures may use exaggerated methods to illustrate the relevant details or structures of the embodiments of the present disclosure. The various publications, patents and published patent specifications cited herein are incorporated herein by reference in their entirety. The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention.

[0034] In the description of the present invention, unless otherwise expressly specified or limited, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless otherwise specified or explained, the term "plurality" refers to two or more. The terms "connected" and "fixed" are to be understood broadly. For example, "connected" can mean a fixed connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0035] In the description of this specification, it should be understood that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described from the perspectives shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should be understood that when it is mentioned that an element is connected to another element "on" or "under", it can not only be directly connected to the other element "on" or "under", but also be indirectly connected to the other element "on" or "under" through an intermediate element.

[0036] Example 1

[0037] Refer to the instruction manual Figure 1 To the attached Figure 2 , a method for making a carriage:

[0038] According to the design drawings, the front panel, rear door panel, top panel, bottom panel, left panel and right side panel are determined, and the fiberglass panels, Q460 steel plates and aluminum-lithium alloy plates are cut into the shapes of the front panel, rear door panel, top panel, bottom panel, left panel and right side panel. The cut car body panel materials are pre-pressed into three layers with the aluminum-lithium alloy plate in the middle and the fiberglass panels and Q460 steel plates at the upper and lower positions, and are stacked. The pre-pressed materials are heat-treated and heated, and the punching machine is pressurized. The heat-treated materials are punched by the punching machine. The stamped front panel, rear door panel, top panel, bottom panel, left panel and right side panels are stacked and cooled. After cooling, the gaps in the car body panels are poured with resin glue. The materials after filling the gaps are pressed again with positive pressure by the punching machine to make the resin glue fit tightly with the side walls of the material interlayer. Then, the car body panels are left to stand and wait for the resin glue in the car body panels to solidify. After trimming the burrs, the car body panels are obtained.

[0039] Example 2

[0040] Based on the first embodiment, refer to the attached Figure 1 To the attached Figure 2 , a method for making a carriage:

[0041] The ANSYS first-order optimization method is used for the left and right side panels of the car body to conduct stress analysis on the side panels when the panel thickness is 10mm~2mm. When other parameters remain unchanged, as the panel thickness decreases, the maximum mises stress first increases slowly and then starts to rise rapidly after the panel thickness is less than 6mm. The maximum displacement first increases slowly and then starts to climb rapidly after the panel thickness is less than 3mm. Therefore, in order to reduce stiffness loss, the side panel thickness should not be less than 3.0mm.

[0042] A stress analysis of the front panel with panel thicknesses ranging from 10mm to 2mm reveals that, with decreasing thickness, the maximum mises stress increases slowly, then rapidly increases after the panel thickness drops below 5mm. The maximum displacement increases slowly, then rapidly increases after the panel thickness drops below 4.5mm. Therefore, to minimize stiffness loss, the side panel thickness should not be less than 4.5mm.

[0043] The stress analysis of the rear panel is conducted when the panel thickness is 10mm~2mm. When other parameters remain unchanged, as the thickness decreases, the maximum mises stress of the panel first increases slowly, and then begins to rise rapidly after the panel thickness is less than 3mm. The maximum displacement first increases slowly, and then begins to rise rapidly after the panel thickness is less than 3mm. In order to reduce the stiffness loss, the thickness of the rear panel should not be less than 3mm.

[0044] A stress analysis was conducted on the base plate when the panel thickness was 10mm~2mm. When other parameters remained unchanged, as the thickness decreased, the maximum mises stress of the panel first increased very slowly, and then began to rise rapidly after the panel thickness was less than 4.7mm. The maximum displacement first increased slowly, and then began to rise rapidly after the panel thickness was less than 4.7mm. Therefore, in order to reduce the stiffness loss, the base plate panel thickness should not be less than 4.7mm.

[0045] Example 3

[0046] Based on the first embodiment, refer to the attached Figure 1 To the attached Figure 2 , a method for making a carriage:

[0047] According to the design drawings, the front panel, rear door panel, top panel, bottom panel, left panel and right side panel are determined, and the fiberglass panels, Q460 steel plates and aluminum-lithium alloy plates are cut into the shapes of the front panel, rear door panel, top panel, bottom panel, left panel and right side panel. The cut car body panel materials are pre-pressed into three layers with the aluminum-lithium alloy plate in the middle and the fiberglass panels and Q460 steel plates at the upper and lower positions, and are stacked. The pre-pressed materials are heat-treated and heated, and the punching machine is pressurized. The heat-treated materials are punched by the punching machine. The stamped front panel, rear door panel, top panel, bottom panel, left panel and right side panels are stacked and cooled. After cooling, the gaps in the car body panels are poured with resin glue. The materials after filling the gaps are pressed again with positive pressure by the punching machine to make the resin glue fit tightly with the side walls of the material interlayer. Then, the car body panels are left to stand and wait for the resin glue in the car body panels to solidify. After trimming the burrs, the car body panels are obtained.

[0048] The car body panels are placed on the assembly frame for sealing design:

[0049] Design of carriage sealing: Reliable sealing is an important condition to ensure that the air leakage and heat leakage rate of the carriage are at a high level. At the same time, reliable sealing can prevent the increase of the heat leakage rate of the carriage during use.

[0050] Sealed by structure:

[0051] Steps are designed at the assembly points of the car body panels to increase the sealing length of the assembly section and improve the structural strength of the assembly points. The joint surfaces of each panel (including the rear door frame and each panel) are coated with body assembly glue to achieve reliable sealing.

[0052] Carriage floor sealing: Polyurethane structural adhesive is used to seal the joints between the bottom panel, side panels and front panels.

[0053] Sealing between door and door frame: The rear door and door frame adopt universal labyrinth-type rubber strips and effective control of door gap to achieve reliable sealing.

[0054] Apply sealant to the lamp openings and switches in the compartment before installation.

[0055] Example 4

[0056] Based on the first embodiment, refer to the attached Figure 1 To the attached Figure 2 , an assembly process of a carriage:

[0057] Requirements and formulation of assembly process regulations:

[0058] Under the given production conditions, the most appropriate assembly process is determined in the form of documents, and the assembly system diagram and the organizational form of assembly production are designed. In order to explain the assembly system diagram, it is first necessary to explain the terms in the assembly system diagram: Parts: A product made of a whole piece of material, which is the most basic unit of assembly; Components: A composite unit composed of several parts. Components can be divided into assemblies and subassemblies according to their positional relationship with the general assembly line during the assembly process. Subassemblies can be divided into first-level subassemblies and second-level subassemblies.

[0059] Parts that go directly into final product assembly are called components. Parts that go into component assembly are called first-level subassemblies. Parts that go into first-level subassembly assembly are called second-level subassemblies, and so on. Subassemblies at any level are made up of subassemblies and parts at the next lower level, while the lowest-level subassembly consists of only a few parts.

[0060] The assembly of process parts and the overall assembly of products should be carried out in a certain order, and the order of assembly should be expressed in the form of a diagram; the assembly order of the first assembly system diagram is from top to bottom, and the parts and small parts directly installed on the process parts are drawn from the vertical line. The parts are drawn on the right side of the vertical line, and the small parts are drawn on the left side of the vertical line; the second assembly system diagram is to draw a horizontal line first, and draw a rectangle representing the reference part or reference part on its left end, and then draw the parts and components directly installed on the machine from left to right from the horizontal line in the assembly order. The parts are drawn above the horizontal line and the components are drawn below the horizontal line.

[0061] After formulating the assembly system diagram, select the organizational form of assembly production, namely mobile assembly and fixed assembly; for mobile assembly: when this assembly form is adopted, the assembled object is continuously or intermittently moved from one workstation to another, which is called flow assembly. The assembly line organized in this assembly form is called an assembly line, which is the basic assembly organization form for mass production.

[0062] Example 5

[0063] Based on the first embodiment, refer to the attached Figure 1 To the attached Figure 2 , an assembly process of a carriage:

[0064] Fixed assembly:

[0065] Fixed assembly organized according to the principle of centralization:

[0066] It is completed by a group of workers at one work location. The workers and the assembly objects are fixed at the same work station. This assembly organization form takes a long time to assemble and requires a high level of technical skills from the workers. It is only suitable for single-piece production.

[0067] Fixed assembly organized according to the principle of decentralization:

[0068] The assembly process is divided into component assembly and final assembly. Component assembly is performed simultaneously by several teams of workers, while final assembly is performed by several other teams. Final assembly is performed on fixed workstations, while component assembly can be stationary or continuous, depending on production conditions. This assembly method, with many teams working simultaneously and using a greater number of specialized tools, allows for worker specialization. It is also a suitable assembly organization format for batch production of large and medium-sized machines. Currently, this format is used in batch production of diesel locomotives.

[0069] Development of assembly process regulations:

[0070] Generally speaking, the documents within the scope of assembly process regulations include assembly drawings of machines and their parts and components, dimension chain analysis drawings, application drawings of various assembly fixtures, inspection method drawings and their descriptions, a list of technical requirements for machining parts, operation and test procedures of each "assembly unit" and the entire machine, drawings of the equipment used, and even assembly cycle charts. This series of documents and the assembly process cards and procedure cards used in daily life constitute a complete set of technical data for mastering product assembly technology and ensuring product quality.

[0071] Four principles for formulating assembly process regulations:

[0072] Ensure the quality of product assembly and strive to improve its quality; the workload of fitter assembly is as small as possible; the assembly cycle is shortened as much as possible; the production area of ​​the workshop is as small as possible, that is, strive to have the maximum productivity per unit area.

[0073] When compiling assembly process procedures, we must first study the structure and function of the product in detail, as well as the technical conditions for product manufacturing, testing and acceptance. The compilation of assembly process procedures should be coordinated with mechanical processing process procedures, welding process procedures, etc., so as to minimize additional mechanical processing, manual repair and welding work during the assembly process. The compilation of assembly process procedures starts with the product assembly drawing, and the assembly system diagram is compiled based on the assembly drawing, and then detailed assembly process procedures are formulated based on the assembly system diagram.

[0074] Analysis of assembled carriage products:

[0075] Study product drawings and the technical requirements to be met during assembly; conduct "dimensional analysis" and "process analysis" of the product structure. The former refers to the analysis and calculation of the assembly dimension chain, while the latter refers to the analysis of the structural assembly processability, the rough manufacturing of parts, and the machining processability. The product is broken down into "assembly units" that can be assembled independently to organize the assembly work in a parallel, streamlined manner.

[0076] Through the work in the above stages, the product drawings and technical requirements are clarified and confirmed (if there are any discrepancies with the processability, they need to be modified), and the methods to achieve assembly accuracy and the corresponding parts processing accuracy requirements are finally determined.

[0077] Determination of assembly process:

[0078] Corresponding to the level of assembly units, there are assembly, subassembly, component assembly, and final machine assembly. These assembly processes are completed through a series of assembly tasks in the optimal construction sequence. To this end, it is necessary to first describe the basic content of assembly tasks, their functions, and relevant key points.

[0079] Basic contents of assembly work:

[0080] Cleaning, scraping, balancing, interference connection, threaded connection, correction, in addition to the above-mentioned assembly work, inspection of components or final assembly, trial operation, painting, packaging, etc. generally also belong to assembly work. The final assembly work of large-scale power machinery is generally carried out directly on a special test bench with detailed test procedures. In this case, the test work is carried out by the test workshop.

[0081] For example, for interference fits, press fits or thermal expansion (or contraction) fits are used. For some assembly process parameters, such as the preload force during rolling bearing assembly and the preload force for threaded connections, if no empirical data is available, experiments or calculations are necessary. When specialized tools or equipment are necessary, a design brief is submitted. To estimate assembly cycles and arrange work schedules, time quotas and worker grades are determined for each assembly task. Time quotas are generally estimated based on actual factory experience and statistical data.

[0082] Determination of assembly sequence:

[0083] Regardless of the level of assembly unit, a certain part or an assembly unit one level lower than it must be selected as the reference part and the assembly work must be started first; then the order of installation of other parts or assembly units should be considered according to the specific conditions of the structure and the assembly technical requirements. In short, it is conducive to ensuring the assembly accuracy and making the assembly connection and correction work go smoothly; the general rule is: first bottom, then top; first inside, then outside; first difficult, then easy; first heavy, then light and small; first precision, then general.

[0084] Preparation work for parts or assembly units to enter assembly: mainly pay attention to inspection to prevent unqualified products from entering assembly; pay attention to chamfering, removing burrs, and preventing surface damage; clean and dry, etc.

[0085] Handling of reference parts: In addition to arranging the above work, attention should be paid to the placement level and rigidity. Only leveling can be done, not forced pressure, to prevent deformation due to gravity or tightening from affecting the assembly accuracy. To this end, attention should be paid to arranging the placement of supports, the adjustment of reference parts, etc.

[0086] Inspection work: During and after an assembly work, inspection work must be arranged according to quality requirements.

[0087] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A method for manufacturing a carriage, characterized in that: The production method includes the following production steps: S1: Determine the front panel, rear door panel, top panel, bottom panel, left side panel and right side panel according to the design drawings, and cut the fiberglass panels, Q460 steel plates and aluminum-lithium alloy plates into the shapes of the front panel, rear door panel, top panel, bottom panel, left side panel and right side panel; S2: The car body panel materials cut in S1 are pre-pressed into three layers with an aluminum-lithium alloy plate in the middle, and fiberglass panels and Q460 steel plates at the upper and lower positions, and are stacked. The pre-pressed materials are heat-treated, pressurized with a punching machine, and then punched with the punching machine; S3: The front panel, rear door panel, top panel, bottom panel, left panel and right panel stamped in S2 are stacked and placed for cooling, and nitrile and silicone rubber material sheets are attached to the inner side of the car body panel. After completion, resin glue is poured to fill the gaps in the car body panel. S4: The material after the gap is filled in S3 is pressed again into the carriage panel using a punching machine in a positive pressure manner, so that the resin glue and the side wall of the material sandwich are tightly attached, and then the carriage panel is left to stand and wait for the resin glue in the carriage panel to solidify. After trimming the burrs, the carriage panel is obtained; The method for manufacturing a carriage further includes an assembly process for the carriage, wherein the assembly process includes the following processes and steps: placing a carriage assembly frame on a horizontal surface, and pre-placing the front panel, rear door panel, top panel, bottom panel, left panel, and right panel on the six surfaces of the assembly frame one by one; Adjust the placement of the carriage panels, and then use stainless steel screws to fasten the carriage panels placed on the assembly frame; Fill the unsaturated resin glue into the joints of the car body panels after tightening, and wait for the unsaturated resin glue to solidify after standing for 24-36 hours; Install accessories on the carriage panel; The method for manufacturing a carriage further includes a carriage plate structure, wherein the carriage plate structure includes a carriage plate (1), a support block (2), a protruding side edge (3), a recessed side edge (4), a first nut (5), a second nut (6) and a double-section bolt (7); the carriage plate structure is formed by splicing two or more carriage plates (1); the support block (2) is arranged in an array on the back of the carriage plate (1) in an equidistant manner; the protruding side edge (3) and the recessed side edge (4) are arranged at both ends of the carriage plate (1); the protruding side edge (3) and the recessed side edge (4) can cooperate with each other and overlap; the double-section bolt (7) passes through the overlapping portion of the protruding side edge (3) and the recessed side edge (4); the first nut (5) and the second nut (6) are sleeved on the outer ring of the double-section bolt (7) located outside the protruding side edge (3) and the recessed side edge (4); The double-section bolt (7) has two sections of threads, and the thread directions of the two sections are opposite. The thread directions inside the first nut (5) and the second nut (6) are also opposite, and they cooperate with the threads on the double-section bolt (7).

2. The method for manufacturing a carriage according to claim 1, characterized in that: The Q460 steel plate is a high-strength steel plate with low welding crack sensitivity and a thickness of 5 mm to 100 mm, which is in accordance with the standard YB / T4137-2013.

3. The method for manufacturing a carriage according to claim 1, characterized in that: The resin glue is any one of the following: epoxy modified corrosion-resistant resin glue with model number 197E#, corrosion-resistant shaped resin glue with model number 3301A#, low shrinkage resin glue with model number 196-P#, or paraben heat-resistant resin glue with model number 199A#, or a combination of two or more thereof.

4. The method for manufacturing a carriage according to claim 1, characterized in that: The curing and molding process in step S4 can be performed by natural cooling and curing or low-temperature cooling and curing, wherein the low-temperature cooling and curing can be performed by contact ice cooling, water cooling and vacuum cooling.

5. The method for manufacturing a carriage according to claim 1, characterized in that: The unsaturated resin glue is any one of a low water absorption type unsaturated polyester resin and a low volatility resin.

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