High-strength steel panel structure applied to commercial vehicle and production process thereof

Abstract

The application relates to the technical field of commercial vehicle steel guard plates, and discloses a high-strength steel guard plate structure applied to a commercial vehicle and a production process thereof, the production process comprising the following steps: high-strength steel material is processed to form a guard plate framework component, and heat treatment is carried out; the connecting end of the heat-treated guard plate framework component is subjected to bevel processing to generate an inclined connecting interface; adjacent guard plate framework components are connected through welding to form a guard plate framework; high-strength sheet material is subjected to forming processing to form a guard plate panel; the guard plate panel is arranged on the inner side of the guard plate framework, and the guard plate panel and the guard plate framework form a bonded connecting area; the bonded connecting area of the guard plate panel and the guard plate framework is connected through intermittent welding, and welding is respectively carried out on the two sides of the guard plate panel; and quality detection is carried out on the processed high-strength steel guard plate structure. The application simplifies an assembly process, reduces material cost, and improves the fatigue life of the guard plate under heavy-load working conditions.

Description

Technical Field

[0001] This invention relates to the field of steel sideboard technology for commercial vehicles, and more specifically, to a high-strength steel sideboard structure for use in commercial vehicles and its manufacturing process. Background Technology

[0002] In the side panel structures of light and heavy-duty trucks, a modular assembly structure is often used to meet the requirements of high load-bearing capacity and lightweight design. Current mainstream solutions mostly use high-strength steel rectangular tubing as the side panel frame, combined with hot-pressed high-strength steel corrugated sheets as the panel face.

[0003] The existing manufacturing process is as follows: high-strength steel plates are first extruded into rectangular steel tubes, then heat-treated and tempered to obtain ultra-high strength and toughness. The hot-pressed panels are then welded and fixed to the rectangular tube frame to form a high-strength steel fence. Although this structure has good strength and rigidity, it still has significant drawbacks in actual production and use: The process is lengthy and costly: the rectangular steel tubes need to be extruded, heat-treated, and welded multiple times, resulting in complex procedures, high energy consumption, and low production efficiency. Welding quality is unstable: high-strength steel has poor weldability after heat treatment, and welding thermal cycles easily lead to softening and cold cracking in the heat-affected zone. Welding deformation also easily causes the fence's flatness to exceed tolerances. Service reliability is insufficient: rigid welding cannot effectively absorb high-frequency vibrations during vehicle movement and loading / unloading. After long-term use, micro-cracks easily form at the welds, affecting the fence's fatigue life and safety.

[0004] To address the process and welding defects of the aforementioned high-strength steel solutions, the industry has attempted to revert to using ordinary carbon steel with conventional welding methods as alternatives. However, this approach also faces insurmountable problems: Ordinary steel + continuous full welding: While using thinned ordinary low-carbon steel plates with rectangular tube frames for continuous full welding reduces material costs, for plates 1.4mm thick or less, the massive heat input from continuous welding easily leads to panel melt-through and severe wave deformation. Post-weld leveling is labor-intensive, and the insufficient strength of ordinary steel necessitates increasing plate thickness, resulting in failure to achieve lightweighting goals. Ordinary steel + intermittent welding or spot welding: To avoid burn-through, intermittent welding or resistance spot welding is used. While this solves the thermal deformation problem, the connection strength and sealing performance are significantly reduced, making it prone to tearing under heavy lateral pressure and unable to meet the high load-bearing requirements of truck side panels.

[0005] Therefore, it is necessary to design a high-strength steel side panel structure and its manufacturing process for commercial vehicles to solve the problems existing in the current technology. Summary of the Invention

[0006] In view of this, the present invention proposes a high-strength steel side panel structure for commercial vehicles and its manufacturing process, aiming to solve the problems of complex heat treatment process, poor weldability, easy burn-through and deformation of thin plate welding.

[0007] In one aspect, the present invention proposes a manufacturing process for a high-strength steel side panel structure applied to commercial vehicles, comprising: High-strength steel is processed into a parapet frame component, and the parapet frame component is heat-treated. The connecting ends of the heat-treated parapet frame components are beveled to create an inclined connection interface; and adjacent parapet frame components are connected by welding to form a parapet frame. A high-strength thin sheet material is formed into a balustrade panel through molding and processing; the balustrade panel has a corrugated reinforcement structure. The balustrade panel is disposed on the inner side of the balustrade frame, and the balustrade panel and the balustrade frame form a fitting and connecting area; Intermittent welding is used to connect the mating area of ​​the balustrade panel and the balustrade frame, and welding is performed on both sides of the balustrade panel respectively, forming staggered welding connection areas on both sides of the balustrade panel. The high-strength steel balustrade structure that has been processed is subjected to quality inspection.

[0008] Furthermore, the high-strength steel material is a rectangular square tube with a tensile strength of 1500MPa and a cross-sectional size of 50mm×70mm; the high-strength steel material is formed and processed by a laser pipe welding machine to obtain an initial tube body, and the initial tube body is heated to 930℃ in a heating furnace and held at that temperature for 4 to 11 minutes before being cooled to obtain the parapet frame component.

[0009] Furthermore, the inclined angle of the inclined connection interface formed by the bevel processing of the connecting end of the parapet frame component is 45°±1°; two adjacent parapet frame components fit together through the inclined connection interface, so that the connection position forms a V-shaped welding groove for expanding the welding joint area.

[0010] Furthermore, the V-shaped welding groove is fully welded using gas shielded welding; after welding, adjacent parapet frame components are connected end to end to form a closed parapet frame.

[0011] Furthermore, the balustrade panel is made of a high-strength thin plate material with a tensile strength of 1500MPa and a thickness of 1.4mm; the initial panel with the corrugated reinforcement structure is formed by thermoforming stamping process, and the corrugated reinforcement structure is corrugated or trapezoidal reinforcing ribs; the initial panel is cut and shaped by mold trimming or laser cutting to obtain the balustrade panel.

[0012] Furthermore, the mating connection area between the balustrade panel and the balustrade frame is connected by an intermittent welding method with alternating front and back sides.

[0013] Furthermore, a first set of intermittent welds is formed in the contact area between the front side of the balustrade panel and the balustrade frame; a second set of intermittent welds is formed in the contact area between the back side of the balustrade panel and the balustrade frame; the first set of intermittent welds and the second set of intermittent welds constitute the staggered welding connection area, and are staggered along the extension direction of the balustrade panel.

[0014] Furthermore, the intermittent welding with the front and back sides interspersed is carried out by a skip welding method; during welding, the welding torch first forms multiple single-segment intermittent welds with intervals on the front side of the railing panel, and then switches to the back side of the railing panel to form single-segment intermittent welds with staggered arrangement. After the intermittent welding is completed, the panel of the railing is fully welded.

[0015] Furthermore, the length of the single-segment intermittent weld of the intermittent welding is 20mm to 40mm; the spacing between adjacent single-segment intermittent welds is 80mm to 120mm; and the staggered distance between the intermittent welds on the front and back of the panel is not less than 1 / 2 of the spacing between the single-segment intermittent welds.

[0016] On the other hand, this application also provides a high-strength steel sideboard structure for commercial vehicles, which is manufactured according to the above-mentioned production process of the high-strength steel sideboard structure for commercial vehicles, including a corrugated plate and a high-strength steel rectangular tube skeleton. The high-strength steel rectangular tube skeleton is formed by welding four rectangular tubes, and the inclined connection interface of the rectangular tubes is a slope of 45°±1°. The corrugated plate is fixed to the high-strength steel rectangular tube frame by welding; the corrugated plate has a continuous corrugated reinforcement structure distributed along its length, and the corrugated reinforcement structure is corrugated or trapezoidal reinforcing rib.

[0017] Compared with existing technologies, the advantages of this invention are as follows: Utilizing the V-shaped weld formed by a 45° bevel joint, stress concentration at the weld root is reduced without sacrificing the heat treatment strengthening effect of high-strength steel, thus avoiding the risk of cold cracking caused by welding thermal cycling in high-strength steel. The use of a 1.4mm thick high-strength steel corrugated plate with cross-welding utilizes the rapid thermal response and easy heat dissipation characteristics of thin plates to suppress heat accumulation. Simultaneously, the discontinuous weld releases shrinkage stress, ensuring the flatness of the enclosure is controlled within tolerance, avoiding extensive post-weld leveling processes. By utilizing the geometric rigidity formed by the 45° bevel joint and the moment of inertia of the corrugated plate section, load-bearing capacity comparable to thick-walled pipes is achieved without increasing the rectangular tube wall thickness or adding triangular plates or corner protectors, simplifying assembly processes and reducing material costs. The cross-welding creates a discontinuous elastic connection interface between the panel and the frame, effectively absorbing high-frequency vibrations during vehicle travel and loading / unloading, blocking the initiation path of microcracks, and improving the fatigue life of the enclosure under heavy load conditions. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A flowchart illustrating the production process of a high-strength steel side panel structure for commercial vehicles, provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of a high-strength steel side panel structure for commercial vehicles provided in an embodiment of the present invention; Figure 3 This is a cross-sectional schematic diagram of a high-strength steel sideboard structure for commercial vehicles provided in an embodiment of the present invention.

[0019] Among them, 1. Corrugated plate; 2. High-strength steel rectangular tube skeleton; 3. Inclined connection interface; 4. Corrugated reinforcement structure. Detailed Implementation

[0020] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey its scope to those skilled in the art. It should be noted that, unless otherwise specified, embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] In some embodiments of this application, see Figure 1 As shown, a manufacturing process for high-strength steel side panel structures used in commercial vehicles is proposed, including: High-strength steel is processed into the balustrade frame components, and the balustrade frame components are then heat-treated. The connecting ends of the heat-treated parapet frame components are beveled to create an inclined connection interface; and adjacent parapet frame components are connected by welding to form the parapet frame. High-strength thin sheet material is formed into a balustrade panel through molding and processing; the balustrade panel has a corrugated reinforcement structure; The balustrade panel is placed inside the balustrade frame, and the balustrade panel and the balustrade frame form a fitting and connecting area. Intermittent welding is used to connect the mating area between the balustrade panel and the balustrade frame, and welding is performed on both sides of the balustrade panel, forming staggered welding connection areas on both sides of the balustrade panel. The high-strength steel balustrade structure that has been processed is subjected to quality inspection.

[0022] Specifically, the high-strength steel railing structure in this embodiment mainly includes a railing frame and a railing panel disposed inside the railing frame. The railing frame, as the main load-bearing component of the high-strength steel railing structure, is used to withstand the impact loads generated during the operation of the commercial vehicle and the forces exerted by the cargo. The railing panel, as a protective and enclosing structure, forms the outer protective area of ​​the railing and improves its overall bending resistance through its corrugated reinforcement structure.

[0023] In the fabrication of the balustrade frame, high-strength steel materials that meet ultra-high strength requirements are first selected. In this embodiment, the high-strength steel material is preferably steel with a tensile strength of 1500 MPa, and the resulting balustrade frame component is a rectangular tube with a cross-sectional dimension of 50 mm × 70 mm. During the specific forming process, the high-strength steel material (such as high-strength steel strip) is continuously rolled and laser-welded using a laser-welded pipe machine to obtain the initial tube body. Using laser-welded pipe forming not only results in high production efficiency but also ensures that the balustrade frame component has precise cross-sectional dimensions and a continuous stress path.

[0024] Because 1500MPa-grade high-strength steel, while achieving ultra-high strength, has significantly increased weldability compared to ordinary steel, and the initial tube body after laser welding exhibits residual welding stress and microstructure inhomogeneity, this embodiment involves a specific heat treatment of the initial tube body before subsequent bevel processing and connection of the parapet frame components. Specifically, the initial tube body is heated to 930°C in a furnace and held for 4–11 minutes before cooling to obtain the final parapet frame components.

[0025] The heat treatment process, conducted at a specific temperature (930℃) and holding time (4–11 minutes), allows for the full austenitization of the internal microstructure of the 1500MPa grade rectangular tube, which then transforms into a uniform high-strength microstructure such as martensite or bainite during subsequent cooling. This heat treatment effectively eliminates residual stress generated during laser-welded tube forming, improves the internal microstructure of the material, and enables the material to maintain a stable tensile strength of 1500MPa while achieving a good balance of plasticity and toughness. This not only reduces the material's sensitivity to weld cracks but also lowers the risk of brittle fracture due to impact loads during subsequent service. It ensures that the parapet frame components meet the comprehensive requirements for strength, toughness, and weld connection stability, guaranteeing sufficient structural stability when used as a load-bearing structure.

[0026] After heat treatment, the connecting ends of the parapet frame components are processed to create an inclined connection interface. Compared to the traditional rectangular tube end-to-end right-angle butt joint with a vertical cut, this embodiment changes the geometry of the connecting ends to create an inclined transition area when adjacent parapet frame components are connected.

[0027] Specifically, the connecting ends of two adjacent parapet frame components are machined to form matching beveled surfaces, and the two beveled surfaces are made to fit together. Preferably, the inclination angle of the inclined connecting interface is set to 45°±1°, thereby ensuring that a stable V-shaped welding groove structure is formed after the adjacent parapet frame components are assembled.

[0028] The V-shaped weld bevel increases the welding area between two parapet frame components, resulting in a more uniform stress transfer path in the welded area. Compared to traditional right-angle butt joints, the oblique joint structure in this embodiment reduces stress concentration at the weld root, allowing some of the lateral loads acting on the parapet frame to be transferred along the weld direction. This transforms the local shearing action in traditional structures into tensile and compressive action along the weld direction, improving the torsional resistance and deformation resistance of the connection joint.

[0029] After forming the V-groove, adjacent parapet frame components are welded together. In this embodiment, gas shielded welding is used to fully weld the V-groove, creating a continuous connection between adjacent parapet frame components. During the V-groove connection, the adjacent parapet frame components are first positioned to ensure a stable fit between the two inclined connection interfaces. Then, gas shielded welding equipment is used to continuously weld along the V-groove area. During welding, the welding wire melts to form molten metal, which fills the space between the two inclined connection interfaces, creating a metallurgical bond between the weld metal and the base materials on both sides. By controlling the welding speed, welding current, and welding path, the weld is continuously formed, and excessive heat input in localized areas is avoided.

[0030] After welding, multiple balustrade frame components are connected end-to-end to form a closed balustrade frame structure. Internal connection structures are designed according to the overall dimensions of the balustrade, creating a complete load-bearing framework. Due to the use of a beveled joint structure, the welding process reduces localized heat concentration while ensuring connection strength, lowering the risk of performance degradation in the high-strength steel heat-treated area due to welding thermal cycling. Compared to the traditional rectangular tube connection method of vertically cutting the ends and then butt-jointing at right angles, the beveled joint structure in this embodiment alters the geometric stress state of the welded area. In a right-angle connection structure, external loads tend to concentrate at the weld root and the base material transition area, causing significant shear stress in localized areas, which can easily induce welding cracks, especially in the heat-treated state of high-strength steel. This embodiment uses an inclined connection interface to create a continuous transition, allowing the load to be gradually transferred along the inclined weld direction, reducing localized stress peaks and improving the fatigue load-bearing capacity of the connection joint.

[0031] After the balustrade frame is fabricated, the balustrade panel is further prepared. In this embodiment, the balustrade panel is made of high-strength thin sheet material and is formed into a corrugated structure with enhanced rigidity through molding.

[0032] Specifically, a high-strength thin sheet material with a tensile strength of 1500 MPa and a thickness of 1.4 mm is selected as the raw material for the balustrade panel. During processing, the high-strength thin sheet material is first stamped using a thermoforming stamping process to form a continuously distributed corrugated reinforcement structure along its length on its surface, thus obtaining an initial panel with the corrugated reinforcement structure. The corrugated reinforcement structure can be corrugated or trapezoidal reinforcing ribs.

[0033] After the initial panel is obtained through stamping, it is cut into shape using either die trimming or laser cutting to remove excess material from the edges and ensure the dimensional accuracy of the final product, thus obtaining the panel. Die trimming is suitable for large-scale, high-efficiency standardized production, while laser cutting offers greater flexibility and superior edge quality. The choice between the two can be made flexibly based on actual production pace and cost requirements.

[0034] The corrugated reinforcement structure significantly improves the moment of inertia of the thin-plate structure by altering the cross-sectional shape of the panel, enabling the panel to undergo less bending deformation under vertical loads or lateral impacts. Compared to flat steel plates of the same thickness, panels with corrugated or trapezoidal reinforcing ribs can significantly improve bending resistance by utilizing the spatial structure formed by bending. Combined with the ultra-high strength characteristics of the 1500MPa material, this panel structure perfectly meets the dual requirements of commercial vehicle sideboards for extreme lightweighting and extremely high structural strength without increasing the material thickness (maintaining a 1.4mm thin plate).

[0035] After the processing of the balustrade panel is completed, the balustrade panel is installed on the inner side of the balustrade frame, so that the edge area of ​​the balustrade panel and the balustrade frame form a close connection area, and is then welded into the finished balustrade panel by a welding workstation or by manual welding (full welding or intermittent welding).

[0036] Because the balustrade panel is made of thin, high-strength steel plate, if continuous full welding is used for connection, the large amount of heat input generated during the welding process can easily cause the local temperature of the thin plate to rise rapidly, resulting in burn-through, collapse, and wavy deformation of the panel. Therefore, this embodiment uses a cross-interval welding method on both sides to connect the balustrade panel and the balustrade frame.

[0037] During the specific welding process, a first set of intermittent welds is formed in the area where the front of the balustrade panel meets the balustrade frame, and a second set of intermittent welds is formed in the area where the back of the balustrade panel meets the balustrade frame. The first and second sets of intermittent welds are not on the same straight line, but are staggered along the extension direction of the balustrade panel, creating a cross-staggered structure between the welding areas on both sides. This structure avoids the same cross-sectional area being simultaneously subjected to welding heat from both sides, reducing localized heat accumulation. Furthermore, the intermittent welds release internal stress generated during welding shrinkage, reducing deformation of the thin plate due to welding shrinkage.

[0038] In this embodiment, the alternating front and back side welding is performed using a skip welding method. Specifically, during the welding process, the welding torch first forms multiple spaced single-segment welds on the front side of the panel according to a preset welding path. After completing the connection of a portion of the area, it then moves to the back side of the panel and forms a second set of single-segment welds at a position staggered from the front welds. By using the alternating front and back side skip welding method, the welding heat is dispersed to different areas, avoiding heat concentration caused by continuous welding, and improving the dimensional stability during the welding process.

[0039] Intermittent welds employ short weld segments with a length of 20mm to 40mm, and the spacing between adjacent weld segments is set to 80mm to 120mm. The intermittent welds on the front and back of the balustrade panel are staggered along the projection direction, with a stagger distance not less than half the spacing between adjacent weld segments. The parameters of the intermittent welds are set based on the balustrade panel thickness, material thermal conductivity, and welding heat input requirements. When the weld length is too long, the heat accumulation within the unit welding area increases, easily causing excessive local temperature rise in the thin plate, leading to burn-through or wavy deformation; when the weld length is too short, it may reduce the connection strength between the panel and the frame. Therefore, by setting appropriately long short weld segments and combining them with a reasonable welding spacing, the welding heat can be fully diffused between adjacent welding areas, ensuring connection strength while reducing the risk of thermal deformation.

[0040] For example, the length of a single weld segment is set to 30mm, the pitch between adjacent welds is set to 100mm, and the front weld and the back weld are staggered by 50mm, so that the welding positions on the front and back sides form an intersecting distribution structure.

[0041] The staggered arrangement of the front and back welds is not merely used to increase the number of welding areas, but rather to alter the distribution of welding heat along the thickness and length of the panel. When the front and back welds are in the same position, the heat generated by welding on both sides tends to overlap, creating a large temperature gradient in localized areas and causing localized shrinkage deformation of the thin panel. This embodiment, by staggering the front and back welds along the extension direction, allows different areas to bear the welding heat input separately, thereby reducing thermal stress concentration and improving the overall flatness of the panel.

[0042] Finally, the entire panel is fully welded to increase its overall strength.

[0043] By adopting the above welding parameters, the welding heat input per unit length can be effectively reduced, so that the thin corrugated panel can avoid burn-through while ensuring the connection strength. At the same time, the interval area formed between the intermittent welds can be used to release welding stress and improve the planar stability of the parapet structure.

[0044] After completing the above welding process, the high-strength steel balustrade structure undergoes quality inspection. Specific inspection items include: visual and internal quality inspection of the mitered welds to determine if there are any incomplete penetrations, cracks, or forming defects in the V-shaped weld joints; connection strength testing of the intermittent weld areas between the balustrade panel and the frame to confirm that the welded areas meet structural connection requirements; and inspection of the overall dimensions, flatness, and local deformation of the balustrade to evaluate the effectiveness of the intermittent welding process in controlling welding deformation.

[0045] Through the aforementioned manufacturing process, this embodiment utilizes a 45° oblique joint structure to improve the stress state of the high-strength steel frame connection area. Simultaneously, it employs thin corrugated plates and intermittent welding on both sides to reduce the heat impact of welding, achieving the manufacturing of a high-strength, lightweight, and low-deformation commercial vehicle high-strength steel sideboard structure. This solution uses high-strength steel rectangular tubes as the main load-bearing frame of the sideboard, and the connecting ends of the rectangular tubes are obliquely processed, allowing adjacent rectangular tubes to form a V-shaped connection node with continuous transition characteristics through a 45° oblique joint. Compared to the load concentration at the weld root in traditional right-angle butt joint structures, this solution expands the welded joint area using the oblique joint interface, allowing the vertical shear load acting on the sideboard surface to be transferred along the oblique weld and transformed into tensile and compressive loads distributed along the weld direction. This reduces local stress concentration in the connection area and improves the torsional resistance and deformation resistance of the sideboard frame nodes. Furthermore, this structure increases connection stiffness without the need for additional reinforcements, reducing structural redundancy.

[0046] To address the issue that thin high-strength steel corrugated panels are prone to localized overheating due to concentrated heat input during continuous full welding, leading to problems such as burn-through, thermal deformation, and reduced flatness, this solution employs a cross-welding process on both sides to connect the corrugated panel to the rectangular tube frame. By breaking down the continuous welding process into multiple short, spaced weld segments, the heat input to individual welding areas is effectively controlled. Furthermore, the staggered arrangement of weld points on both sides prevents continuous heating of the same cross-sectional area, thus reducing welding heat accumulation. Simultaneously, the discontinuous connection interface formed by the intermittent welds releases welding shrinkage stress, effectively suppressing corrugated deformation of the thin plate while ensuring the connection strength between the panel and the frame, thereby improving the stability and fatigue reliability of the parapet structure under long-term vibration conditions.

[0047] Based on another preferred embodiment described above, see [link to preferred embodiment]. Figure 2-3 As shown, this embodiment provides a high-strength steel sideboard structure for commercial vehicles, which is manufactured according to the above-mentioned production process of the high-strength steel sideboard structure for commercial vehicles, including a corrugated plate 1 and a high-strength steel rectangular tube frame 2. The high-strength steel rectangular tube skeleton 2 is formed by welding 4 rectangular tubes, and the inclined connection interface 3 of the rectangular tubes is a slope of 45°±1°. The corrugated plate 1 is fixed to the high-strength steel rectangular tube frame 2 by welding; the corrugated plate 1 has a continuous corrugated reinforcement structure 4 along its length, which is corrugated or trapezoidal reinforcing rib.

[0048] In summary, the V-shaped weld formed by the 45° bevel joint reduces stress concentration at the weld root without sacrificing the heat treatment strengthening effect of high-strength steel, thus avoiding the risk of cold cracking caused by welding thermal cycling in high-strength steel. Using a 1.4mm thick high-strength steel corrugated plate with cross-welding, the rapid thermal response and easy heat dissipation of the thin plate suppress heat accumulation. Simultaneously, the discontinuous weld releases shrinkage stress, ensuring the flatness of the enclosure is controlled within tolerance, avoiding extensive post-weld leveling processes. Utilizing the geometric rigidity formed by the 45° bevel joint and the moment of inertia of the corrugated plate section, load-bearing capacity comparable to thick-walled pipes is achieved without increasing the rectangular tube wall thickness or adding triangular plates or corner protectors, simplifying assembly processes and reducing material costs. The cross-welding creates a discontinuous elastic connection interface between the panel and the frame, effectively absorbing high-frequency vibrations during vehicle travel and loading / unloading, blocking the initiation path of microcracks, and improving the fatigue life of the enclosure under heavy load conditions.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the present invention.

Claims

1. A manufacturing process for a high-strength steel side panel structure used in commercial vehicles, characterized in that, include: High-strength steel is processed into a parapet frame component, and the parapet frame component is heat-treated. The connecting ends of the heat-treated parapet frame components are beveled to create an inclined connection interface; and adjacent parapet frame components are connected by welding to form a parapet frame. A high-strength thin sheet material is formed into a balustrade panel through molding and processing; the balustrade panel has a corrugated reinforcement structure. The balustrade panel is disposed on the inner side of the balustrade frame, and the balustrade panel and the balustrade frame form a fitting and connecting area. Intermittent welding is used to connect the mating area of ​​the balustrade panel and the balustrade frame, and welding is performed on both sides of the balustrade panel respectively, forming staggered welding connection areas on both sides of the balustrade panel. The high-strength steel balustrade structure that has been processed is subjected to quality inspection.

2. The manufacturing process of the high-strength steel side panel structure for commercial vehicles according to claim 1, characterized in that, The high-strength steel material is a rectangular square tube with a tensile strength of 1500MPa and a cross-sectional size of 30-50mm × 40-90mm. The high-strength steel material is formed and processed by a laser pipe welding machine to obtain an initial tube body. The initial tube body is heated to 930℃ in a heating furnace and held at that temperature for 4-11 minutes before being cooled to obtain the parapet frame component.

3. The manufacturing process of the high-strength steel side panel structure for commercial vehicles according to claim 1, characterized in that, The inclined angle of the inclined connection interface formed by the bevel processing of the connecting end of the parapet frame component is 45°±1°; two adjacent parapet frame components fit together through the inclined connection interface, so that the connection position forms a V-shaped welding groove for expanding the welding joint area.

4. The manufacturing process of the high-strength steel side panel structure for commercial vehicles according to claim 3, characterized in that, The V-shaped welding groove is fully welded using gas shielded welding; after welding, adjacent parapet frame components are connected end to end to form a closed parapet frame.

5. The manufacturing process for the high-strength steel side panel structure applied to commercial vehicles according to claim 1, characterized in that, The balustrade panel is made of a high-strength thin plate material with a tensile strength of 1500MPa and a thickness of 0.8-3mm; the initial panel with the corrugated reinforcement structure is formed by thermoforming stamping process, and the corrugated reinforcement structure is corrugated or trapezoidal reinforcing ribs; the initial panel is cut and shaped by mold trimming or laser cutting to obtain the balustrade panel.

6. The manufacturing process of the high-strength steel side panel structure for commercial vehicles according to claim 5, characterized in that, The mating connection area between the balustrade panel and the balustrade frame is connected by an intermittent welding method with alternating front and back sides.

7. The manufacturing process for the high-strength steel side panel structure applied to commercial vehicles according to claim 6, characterized in that, A first set of intermittent welds is formed in the contact area between the front side of the balustrade panel and the balustrade frame; a second set of intermittent welds is formed in the contact area between the back side of the balustrade panel and the balustrade frame; the first set of intermittent welds and the second set of intermittent welds constitute the staggered welded connection area, and are staggered along the extension direction of the balustrade panel.

8. The manufacturing process for the high-strength steel side panel structure applied to commercial vehicles according to claim 7, characterized in that, The intermittent welding with the front and back sides intersecting is carried out by skip welding. During welding, the welding torch first forms multiple single-segment intermittent welds with intervals on the front side of the railing panel, and then switches to the back side of the railing panel to form single-segment intermittent welds with staggered arrangement. After the intermittent welding is completed, the panel of the railing is fully welded.

9. The manufacturing process for the high-strength steel side panel structure applied to commercial vehicles according to claim 8, characterized in that, The length of a single intermittent weld in the intermittent welding is 20mm to 40mm; the spacing between adjacent single intermittent welds is 80mm to 120mm; the staggered distance between the intermittent welds on the front and back of the panel is not less than 1 / 2 of the spacing between the single intermittent welds.

10. A high-strength steel side panel structure for commercial vehicles, manufactured according to the production process of the high-strength steel side panel structure for commercial vehicles as described in any one of claims 1-9, characterized in that, Includes corrugated plates and a high-strength steel rectangular tube frame; The high-strength steel rectangular tube skeleton is formed by welding four rectangular tubes, and the inclined connection interface of the rectangular tubes is a slope of 45°±1°. The corrugated plate is fixed to the high-strength steel rectangular tube frame by welding; the corrugated plate has a continuous corrugated reinforcement structure distributed along its length, and the corrugated reinforcement structure is corrugated or trapezoidal reinforcing rib.

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