A method of lengthening welding for a chassis side beam

Abstract

The present application relates to the field of workpiece fixing or positioning method, and particularly relates to a lengthening welding method for a chassis side beam, comprising: selecting a plate with a preset size, cutting a polygonal groove at a preset position of the plate; bending the long side of the plate without the polygonal groove according to a set width, bending the long side of the plate with the polygonal groove according to the set width, and welding an inclined plate along the edge formed on the plate along the polygonal groove to form a fish belly structure with a concave cross section. The present application reduces the length of the welding seam of the fish belly structure, and the welding is performed by short welding seams, which is more beneficial to the welding of operators in actual production and has a high welding speed.

Description

Technical Field

[0001] This invention relates to the field of methods for fixing or positioning workpieces, and more specifically to a method for welding extensions of side beams of a base frame. Background Technology

[0002] With the rapid development of the manufacturing industry, after completing the production tasks of the C70 general-purpose open wagon and the X70 container flat wagon, we are now facing the production task of the new CMZ60 flat wagon.

[0003] Whether it's an open wagon or a flatcar, the underframe, as a crucial component bearing the main load, must be manufactured in strict accordance with the technical specifications to ensure its quality. The side beams, as an important part of the underframe of export flatcars, are vital for ensuring the safe operation of the entire vehicle.

[0004] Currently, open wagons or flatcars use fish-belly beams for their underframes. These beams are made of long, narrow channel steel with right-angled trapezoidal openings. A hydraulic cylinder then compresses the long base of the opening, which is in a deformed state, to fit against the short base. Finally, the opening is welded together using submerged arc welding, resulting in a continuous, straight weld that is quite long. This current fish-belly beam manufacturing process is complex and cumbersome, and the long, straight weld is prone to deformation under high heat input. Summary of the Invention

[0005] The present invention aims to provide a method for welding the extension of the side beam of the underframe, so as to solve the problems of complex and troublesome formation process of the fish belly beam and easy deformation of the weld.

[0006] The welding methods for extending the side beams of the underframe in this solution include: Step 1: Select a board of a preset size and cut a piece off at a preset position on the board to form a polygonal groove; Step 2: Bend the long side of the board without polygonal grooves to the set width, and bend the long side of the board with polygonal grooves to the set width. Weld a slanted plate along the edge formed by the polygonal grooves on the board to form a fish belly structure with a concave cross-section.

[0007] The beneficial effects of this plan are: When forming the fish belly structure using this method, it is only necessary to bend the plate after cutting it, and then weld it on the edge formed by the polygonal groove on the plate. This reduces the length of the weld for processing the fish belly structure. Welding with a short weld is more convenient for operators in actual production. The welding speed is fast, and gas shielded welding can be used instead of submerged arc welding, reducing welding deformation caused by excessive welding heat input and saving the step of correcting deformation after welding.

[0008] Furthermore, it also includes: Step 3: Weld the fish belly structure to both ends of the concave middle beam to form the fish belly beam structure; Step 4: Weld the open end of the fish belly beam structure to the bottom of the vehicle to complete the welding of the fish belly beam.

[0009] The beneficial effects are: the overall structure is completed by welding three parts, and the base frame is extended by welding the fish belly structure to both ends of the concave middle beam, which is simple and convenient to operate.

[0010] Furthermore, in step 1, a polygonal groove is cut at one corner of the board. The polygonal groove is composed of a right trapezoid and a rectangle. One long side of the rectangle coincides with the base of the right trapezoid but is not equal to it. The other long side of the rectangle coincides with the long side of the board. The right-angled leg of the right trapezoid is located at the center of the long side of the board, and the upper base of the right trapezoid is located on the side of the board facing the center of gravity.

[0011] The beneficial effects are: by cutting the sheet metal, it is easier to weld it into a fish belly beam in subsequent steps. The cutting and welding operations are simple, the processing speed is improved, and the production efficiency is accelerated.

[0012] Furthermore, the rectangle has a length × width of 922mm × 2.28mm, the right trapezoid has a top side length of 118mm, a height of 140mm, and a base side length of 855mm.

[0013] The beneficial effect is that the desired fish belly shape can be formed by setting the size, and the fish belly shape is formed more accurately.

[0014] Furthermore, in step 1, the length of the board in the preset dimensions is set to 3104mm, and the width of the board in the preset dimensions is 500.55mm.

[0015] The beneficial effect is that by setting the size, the length of the weld can be reduced, thus ensuring the strength of the weld.

[0016] Furthermore, in step 2, the welding is performed using a carbon dioxide gas shielded welding method.

[0017] The beneficial effect is that welding using gas shielded welding can reduce the heat required during welding.

[0018] Furthermore, in step 2, the welding current is set to 200A-260A and the welding voltage is set to 22V-28V.

[0019] The beneficial effects are: by setting the welding current and welding voltage parameters, the heat generated during welding can be reduced, and weld deformation can be prevented.

[0020] Furthermore, in step 3, multiple partitions are uniformly welded onto the inner wall of the concave groove of the fish belly beam structure.

[0021] The beneficial effect is that the strength of the fish belly beam structure can be enhanced through multiple partitions. Attached Figure Description

[0022] Figure 1 This is a flowchart illustrating an embodiment of the welding method for extending the side beams of the underframe according to the present invention. Figure 2 This is a top view after cutting in an embodiment of the welding method for extending the side beam of the underframe of the present invention; Figure 3 This is a three-dimensional structural diagram of the plate material after the bending process and before the welding of the inclined plate in an embodiment of the welding method for extending the side beam of the base frame of the present invention. Figure 4 for Figure 2 View after bending; Figure 5 for Figure 2 View after welding the inclined plate; Figure 6 This is a front view of the extended welding method for the side beam of the underframe according to an embodiment of the present invention; Figure 7 A view showing the openings in an existing welding method; Figure 8 for Figure 4 A view of the fish belly beam after welding. Detailed Implementation

[0023] The following detailed description provides further details on specific implementation methods.

[0024] The reference numerals in the accompanying drawings include: 1. Plate, 2. Inclined plate, 3. Opening, 4. Gap, 5. Polygonal groove.

[0025] Example like Figure 1 As shown, the welding method for extending the side beams of the base frame includes: Step 1, as follows Figure 2 and Figure 3 As shown, a pre-defined board material 1 is selected, with its length set to 3104mm (i.e., the length in the pre-defined dimensions is 3104mm) and its width to 500.55mm. A polygonal groove 5 is formed by cutting away a piece at a pre-defined position on board material 1, and a polygonal groove 5 is formed by cutting away a piece at a pre-defined height and a pre-defined top base length at one corner of board material 1, resulting in the following... Figure 2The shown board has a polygonal groove 5 composed of a right trapezoid and a rectangle. The rectangle has a length × width of 922mm × 2.28mm, the right trapezoid has a top side length of 118mm, a height of 140mm, and a base side length of 855mm. One long side of the rectangle coincides with the base side of the right trapezoid but is not equal in length. The right trapezoid is located towards the center of the board 1, and the other long side of the rectangle coincides with the long side of the board 1, so that the upper base of the right trapezoid is located on the side of the board 1 facing the center of gravity.

[0026] Step 2: Bend the long side of board 1 without the polygonal groove 5 to a set width, and bend the long side of board 1 with the polygonal groove 5 to a set width of 150mm, to obtain the following... Figure 3 and Figure 4 The structure shown, Figure 4 The image includes a top view and a left view of the sheet material 1 after the bending process. An inclined plate 2 is welded along the edge formed by the polygonal groove on the sheet material to create a fish-belly structure with a concave cross-section, resulting in the image shown. Figure 5 The structure shown, Figure 5 The image includes a top view and a left view after welding the inclined plate 2. The welding was performed using carbon dioxide gas shielded welding, with the welding current set to 200A-260A and the welding voltage set to 22V-28V.

[0027] Depend on Figure 2 It can be seen that the width of board 1 before bending was 500.55mm, and from Figure 4 and Figure 5 It can be seen that the calculated width of board 1 after bending is 540mm. The reason for the width deviation before and after bending is that two bends were made on the long side of board 1, and the bends formed an arc. Furthermore, from... Figure 4 It is known that the thickness of board 1 is 12mm. Board 1 has elongation deformation at the bending point. Therefore, the width of board 1 calculated after bending is greater than the actual width of board 1 before bending, which is not contradictory.

[0028] Step 3: Weld the fish belly structure to both ends of the concave middle beam to form the fish belly beam structure. Weld multiple partitions evenly on the inner wall of the concave groove of the fish belly beam structure.

[0029] Step 4: Weld the open end of the fish belly beam structure to the bottom of the vehicle to complete the welding of the fish belly beam.

[0030] An opening 3 is currently being made in the channel steel, such as... Figure 7 As shown, then extrusion is performed, and a fish-belly beam is formed at the joint 4 of opening 3 by submerged arc welding, as shown. Figure 8As shown. During submerged arc welding, the welding wire is TH550-NQ-II, the wire diameter is 440mm, the flux is SJ101, the welding current is (650±25)A, and the welding voltage is (39±3)V.

[0031] This embodiment first forms a fish-belly structure in the shape of a channel steel in the form of plate 1, instead of directly using actual channel steel for processing. The cut-off part is then welded to the edge to form the fish-belly shape. This allows for precise formation of the fish-belly structure. Compared to the existing channel steel opening method, less plate material is wasted, saving materials. It also avoids the errors in the fish-belly structure caused by operational mistakes during extrusion molding in the existing method. Furthermore, the fish-belly structure can be designed according to actual needs, making it more suitable for practical requirements. The fish-belly beam is then divided into three parts and welded together, reducing long weld beads into short welds. This simplifies the operation and makes welding easier for operators in actual production. The welding speed is fast, and gas shielded welding can be used instead of submerged arc welding, reducing welding deformation caused by excessive welding heat input and saving the step of correcting deformation after welding.

[0032] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for welding extensions of side beams of a base frame, characterized in that, include: Step 1: Select a board of a preset size and cut a piece off at a preset position on the board to form a polygonal groove; A polygonal groove is cut at one corner of the board. The polygonal groove is composed of a right trapezoid and a rectangle. One long side of the rectangle coincides with the base of the right trapezoid but is not equal to it. The other long side of the rectangle coincides with the long side of the board. The right-angled leg of the right trapezoid is located at the center of the long side of the board, and the upper base of the right trapezoid is located on the side of the board facing the center of gravity. Step 2: Bend the long side of the plate without polygonal grooves to the set width, bend the long side of the plate with polygonal grooves to the set width, and weld the inclined plate along the edge formed by the polygonal grooves on the plate. Use carbon dioxide gas shielded welding to weld to form a fish belly structure with a concave cross-section. Step 3: Weld the fish belly structure to both ends of the concave middle beam to form the fish belly beam structure; Step 4: Weld the open end of the fish belly beam structure to the bottom of the vehicle to complete the welding of the fish belly beam.

2. The method for welding the extension of the side beam of the base frame according to claim 1, characterized in that: The rectangle has a length × width of 922mm × 2.28mm, the right trapezoid has a top side length of 118mm, a height of 140mm, and a base side length of 855mm.

3. The method for welding extensions of the side beams of the base frame according to claim 1, characterized in that: In step 1, the length of the board in the preset dimensions is set to 3104mm, and the width of the board in the preset dimensions is 500.55mm.

4. The method for welding the extension of the side beam of the base frame according to claim 1, characterized in that: In step 2, the welding current is set to 200A-260A and the welding voltage is set to 22V-28V.

5. The method for welding extensions of the side beams of the underframe according to claim 1, characterized in that: In step 3, multiple partitions are uniformly welded onto the inner wall of the concave groove of the fish belly beam structure.

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