A lightweight box structure vehicle body and manufacturing method thereof

Abstract

The present invention belongs to the technical field of production and manufacturing of lightweight box-type vehicles, and relates to a lightweight box-type vehicle body, which includes a vehicle body frame and a vehicle body panel; the vehicle body frame includes a plurality of keel frames, the keel frame is composed of C-shaped keels connected vertically and horizontally, the keel includes a bottom plate, a side plate and a reinforced side wall, the keel frame includes a keel frame, a transverse keel and a longitudinal keel; the transverse keel and the longitudinal keel are connected vertically and horizontally; the vehicle body panel is arranged on the inner surface and the outer surface of the vehicle body frame. While ensuring the strength, the weight of the vehicle body frame is reduced. The entire vehicle body frame only uses one keel material, which is convenient for unified procurement, greatly reduces the procurement cost, and reduces the inventory types. A through hole is opened on the transverse keel, so that the longitudinal keel is inserted through the through hole and the overall integrity of the longitudinal keel is maintained. The riveted connection method is adopted, which can greatly reduce the weight of the vehicle body while ensuring the strength, and has important significance for the development of lightweight vehicles.

Description

Technical Field

[0001] The present invention belongs to the technical field of production and manufacturing of lightweight box-type vehicle bodies, and in particular relates to a lightweight box-type structure vehicle body and a manufacturing method thereof. Background Art

[0002] The country has successively issued the "Management Requirements for Hazardous Substances and Recyclable Utilization Rates in Automobiles" (Ministry of Industry and Information Technology Announcement No. 38 of 2015), "Requirements for Prohibited Substances in Automobiles" and "Calculation Methods for Reusability and Recyclability of Road Vehicles", which put forward environmental protection requirements for vehicle manufacturers to ensure that materials can be recycled.

[0003] The domestic market for box trucks, refrigerated trucks, self-propelled C-type RVs, trailer RVs and other box trucks is huge, and the demand has been on an upward trend. In the current domestic box truck manufacturing process, traditional box truck manufacturing requires a large number of cutting, welding, rust removal, painting and other processes, with high labor costs and high environmental pollution during the production process. The whole plate composite production process needs to be adopted in the manufacturing process of refrigerated transport vehicles, which has low production efficiency, low structural strength and is difficult to decompose. The pollution is relatively large during the later recycling process. For RV manufacturing, most domestic manufacturers have immature production technology. They conventionally use whole plate composite and fill rectangular pipes inside. This method requires cutting and welding of rectangular pipes during the production process. When full welding is used during welding, thermal deformation will occur, which requires correction and grinding. Dust pollution will be generated in the process. The structural strength of point welding is affected to a certain extent and cannot meet the structural strength. The connection accuracy of corner pieces is extremely high, which increases a lot of labor costs. The entire vehicle panel is generally made of fiberglass molds, and a large amount of fiberglass is used in the manufacturing process. The vehicle needs to be polished and painted, and the interior decoration needs to be reinforced. There is a strong odor during the construction process, and the construction is complicated and the production process causes pollution to the environment. Later, the vehicle is difficult to decompose during recycling, which causes a lot of pollution to the environment.

[0004] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a lightweight box-structure vehicle body and a manufacturing method, so as to at least solve the problems of heavy weight of the current vehicle body frame structure, unstable connection points of square tube profiles of the vehicle body frame structure, and severe local damage to the vehicle body after collision.

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

[0007] A lightweight box-structure vehicle body, the vehicle body comprises a vehicle body frame and a vehicle body panel; the vehicle body frame comprises a plurality of keel frames, the plurality of keel frames enclose the vehicle body frame, the keel frame is composed of keels connected in a vertical and horizontal manner, the cross section of the keel is C-shaped, the keel comprises a bottom plate, a side plate and a reinforced side wall, two side plates are provided, the two side plates are located at the two ends of the bottom plate and are vertically connected to the bottom plate, the reinforced side wall is vertically connected to the free ends of the side plates, and the reinforced side wall is located in an opening formed by the two side plates and the bottom plate; the keel frame comprises a keel frame, a transverse keel and a longitudinal keel; at least three keels are connected end to end to form the keel frame, the keel opening directions of the keel frame are all toward the inside of the keel frame, and the transverse keel is vertically and horizontally interlaced with the longitudinal keel; the vehicle body panel is arranged on the inner surface and outer surface of the vehicle body frame.

[0008] In the lightweight box-structure vehicle body as described above, as a preferred embodiment, a through hole is provided on the bottom plate of the transverse keel, the longitudinal keel passes through the through hole and is connected to the transverse keel, and the side panels of the transverse keel and the longitudinal keel are both located on the upper surface and the lower surface of the keel frame; a narrowing groove is provided on the bottom plate of the longitudinal keel at the connecting portion, and the width of the longitudinal keel at the connecting portion is equal to the distance between the inner surfaces of the two side panels of the transverse keel.

[0009] In the lightweight box-structure vehicle body as described above, as a preferred embodiment, a positioning connection hole is opened on the side panel of the connected keels, and a connecting piece is inserted into the positioning connection hole to achieve the connection between the keels; preferably, the connecting piece is a rivet; preferably, a stamping and drawing groove is provided on the side panel, the stamping and drawing groove is recessed in the outer surface of the side panel, and the bottom surface of the stamping and drawing groove protrudes from the inner surface of the side panel; the stamping and drawing groove is a truncated cone groove, and the positioning connection hole passes through the bottom surface of the stamping and drawing groove.

[0010] In the lightweight box-structure vehicle body as described above, as a preferred solution, the material of the vehicle body panel is aluminum alloy.

[0011] In the lightweight box-structure vehicle body as described above, as a preferred embodiment, the keel frame includes a top frame, a chassis frame and a vehicle body enclosure frame, and the unit area mass of the keel on the top frame is smaller than the unit area mass of the keel on the chassis frame.

[0012] In the lightweight box-structure vehicle body as described above, as a preferred solution, a weight-saving hollow structure is provided on the side panels of the keel on the top frame; preferably, the weight-saving hollow structure is a weight-saving circular hole.

[0013] The present invention also provides a method for manufacturing the above-mentioned lightweight box-structure vehicle body.

[0014] S1, assembling the body frame;

[0015] S2, laying body panels on the inner and outer surfaces of the assembled body frame;

[0016] S3, installing doors and windows on the vehicle body with the vehicle body panels laid out to form a finished vehicle body.

[0017] In the method for manufacturing a lightweight box-structure vehicle body as described above, as a preferred solution, the S1 specifically includes:

[0018] S11, cutting, selecting a keel of appropriate length according to the size of the vehicle body frame, and processing through holes, positioning connection holes and punching and drawing grooves on the keel parts to be connected;

[0019] S12, assembling the keel frame, and respectively assembling the top frame, the chassis frame, the body side frame and the body front and rear frames according to the structure of the body frame;

[0020] S13, assembling the assembled keel frames end to end and connecting them together to form a vehicle body enclosure frame;

[0021] S14, placing the vehicle body enclosure frame on the chassis frame and connecting them so that the outer frame of the vehicle body enclosure frame is flush with the outer frame of the chassis frame;

[0022] S15, connecting the top frame to the upper surface of the vehicle body enclosure frame to form a complete vehicle body skeleton.

[0023] In the method for manufacturing a lightweight box-structure vehicle body as described above, as a preferred solution, the S2 specifically includes:

[0024] S21, cutting, cutting the body panels according to the shapes of the keel frames of the body frame;

[0025] S22, applying adhesive to the frame side panels on the outer surface and inner surface of the vehicle body frame;

[0026] S23, bonding the vehicle body panel to the inner and outer surfaces of the corresponding vehicle body frame;

[0027] S24, welding the adjacent body panels together to complete the laying of the body panels.

[0028] In the method for manufacturing a lightweight box-structure vehicle body as described above, as a preferred embodiment, S2 also includes: S25, drilling a hole on the vehicle body frame and installing an exhaust nozzle, connecting the exhaust device to the exhaust nozzle, and exhausting the space between the inner and outer vehicle body panels to a preset pressure to form a negative pressure.

[0029] Compared with the closest prior art, the technical solution provided by the present invention has the following beneficial effects:

[0030] The lightweight box-shaped structure vehicle body provided by the present invention adopts a C-shaped keel as the material of the vehicle body frame, which reduces the weight of the vehicle body frame while ensuring the strength. The entire vehicle body frame only adopts one keel material, which is convenient for unified procurement, greatly reduces the procurement cost, and reduces the inventory types. The present invention opens a through hole on the transverse keel, so that the longitudinal keel is inserted through the through hole and maintains the overall integrity of the longitudinal keel. The connection is made by riveting, which is simple to construct. The keel frame after connection is an integral whole with greater overall strength. When the keel frame is locally stressed, the force can be well dispersed to reduce the probability of local damage. By setting a stamping and drawing groove at the positioning connection hole, the positioning between the connected keels is facilitated, and the overlapping drawing grooves can also greatly enhance the connection strength. By adopting a C-shaped keel and a riveting connection method, the weight of the vehicle body can be greatly reduced while ensuring the strength, which is of great significance to the development of lightweight vehicle bodies. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings constituting a part of the present application 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 an improper limitation of the present invention. Among them:

[0032] Figure 1 This is a schematic diagram of the connection between the transverse keel and the longitudinal keel according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the keel frame connection according to an embodiment of the present invention;

[0034] Figure 3 It is an expanded view of the vehicle body enclosure frame structure according to an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the structure of the reinforced longitudinal beam according to an embodiment of the present invention;

[0036] Figure 5 It is a structural schematic diagram of a chassis frame according to an embodiment of the present invention;

[0037] Figure 6 A schematic diagram of a stamping and drawing groove structure according to an embodiment of the present invention;

[0038] Figure 7 The figure is a schematic diagram of the vehicle body skeleton structure according to an embodiment of the present invention.

[0039] In the figure: 1. Top frame; 2. Chassis frame; 3. Body enclosure frame; 4. Horizontal keel; 5. Longitudinal keel; 6. Bottom plate; 7. Side plate; 8. Reinforced side wall; 9. Through hole; 10. Narrowing groove; 11. Positioning connection hole; 12. Stamping and drawing groove; 13. Rivet; 14. Reinforced longitudinal beam; 15. Reinforced cross beam; 16. Longitudinal reinforcing keel. DETAILED DESCRIPTION

[0040] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0041] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0042] Example 1

[0043] According to an embodiment of the present invention, Figures 1 to 7 As shown, the present invention provides a lightweight box-structure vehicle body, which includes a vehicle body frame and a vehicle body panel. The arrow in the accompanying drawing indicates the moving direction of the keel when it is installed.

[0044] The vehicle body frame includes a plurality of keel frames, which are enclosed to form the vehicle body frame. The keel frame is composed of keels connected vertically and horizontally, such as Figure 4 As shown, the cross-section of the keel is a C-shaped structure. The keel includes a bottom plate 6, a side plate 7 and a reinforced side wall 8. Two side plates 7 are provided. The two side plates 7 are located at both ends of the bottom plate 6 and are vertically connected to the bottom plate 6. The reinforced side wall 8 is vertically connected to the free end of the side plate 7, and the reinforced side wall 8 is located in the opening formed by the two side plates 7 and the bottom plate 6.

[0045] The keel frame includes a keel frame, a transverse keel 4 and a longitudinal keel 5; at least three keels are connected end to end to form a keel frame, and the keel openings of the keel frame are all directed toward the inside of the keel frame, and the transverse keel 4 and the longitudinal keel 5 are connected vertically and horizontally.

[0046] The vehicle body panels are disposed on the inner and outer surfaces of the vehicle body frame.

[0047] When in use, the keels are first connected into a keel frame, and then a plurality of keel frames are enclosed and connected together to form a vehicle body frame, and finally the vehicle body panels are laid on the inner and outer surfaces of the vehicle body frame to obtain the lightweight box structure vehicle body. The present invention adopts a C-shaped keel, which greatly reduces the weight of the vehicle body frame while ensuring strength, thereby reducing the weight of the entire vehicle body and achieving lightweight.

[0048] In this embodiment, the C-shaped keel is formed by cold-bending a thin-walled steel strip or an aluminum alloy strip, and its cross-sectional specifications are uniform. When in use, it can be cut to a fixed length according to the required length.

[0049] Furthermore, if Figure 1 As shown, a through hole 9 is opened on the bottom plate 6 of the transverse keel 4, and the longitudinal keel 5 passes through the through hole 9 to be interlaced with the transverse keel 4 and connected with the transverse keel 4, and the side plates 7 of the transverse keel 4 and the longitudinal keel 5 are both located in the upper surface and the lower surface of the keel frame; a narrowing groove 10 is provided on the bottom plate 6 of the longitudinal keel 5 at the connection part, specifically, a groove is punched out on the bottom plate 6 of the longitudinal keel 5 at the connection part, so that the width of the longitudinal keel 5 at this part is reduced, and then the width of the longitudinal keel 5 at the connection part is equal to the distance between the inner surfaces of the two side plates 7 of the transverse keel 4, so that the width of the transverse keel 4 and the longitudinal keel 5 after the interlaced connection is consistent, which is convenient for the subsequent paving of the vehicle body panel.

[0050] Furthermore, if Figure 6 As shown, a positioning connection hole 11 is opened on the side panel 7 of the connected keels, and the connecting piece is inserted into the positioning connection hole 11 to achieve the connection between the keels; preferably, the connecting piece is a rivet 13, and the material of the rivet 13 is determined according to the material of the keel, mainly to achieve a strong connection; preferably, a stamping and drawing groove 12 is provided on the side panel 7, and the stamping and drawing groove 12 is recessed in the outer surface of the side panel 7, and the bottom surface of the stamping and drawing groove 12 protrudes from the inner surface of the side panel 7; the stamping and drawing groove 12 is a truncated cone groove, and the positioning connection hole 11 passes through the bottom surface of the stamping and drawing groove 12.

[0051] Furthermore, the vehicle body panel is an aluminum alloy plate. The aluminum alloy panel is strong and light, which is conducive to the lightweight of the vehicle body. In this embodiment, the vehicle body panel adopts a metal carved plate, which includes a core material, a surface material and a bottom material. The surface material adopts an aluminum alloy carved plate with various optional carved patterns, and the core material adopts flame-retardant foam. This type of vehicle body panel does not need to be painted after laying, and the protective film of the surface material can be directly torn off. The finished product has a better appearance and is easy to produce. The core material not only plays a supporting role, but also has the effects of heat preservation, noise reduction and heat insulation.

[0052] Furthermore, the keel frame includes a top frame 1, a chassis frame 2 and a body enclosure frame 3. The mass per unit area of ​​the keel on the top frame 1 is smaller than the mass per unit area of ​​the keel on the chassis frame 2, that is, the weight of the keel of the top frame 1 per unit area is smaller than the weight of the keel of the chassis frame 2 per unit area, thereby lowering the center of gravity of the vehicle body, ensuring the stability of the vehicle body during movement while reducing the weight of the vehicle body, and avoiding rollover.

[0053] Furthermore, a weight-reducing hollow structure is provided on the side panels 7 of the keel on the top frame 1; preferably, the weight-reducing hollow structure is a weight-reducing circular hole. That is, a plurality of evenly distributed circular holes are punched out on the keel side panels 7 of the top frame 1, so as to reduce the weight of the vehicle body while meeting the strength requirements. Because the bearing force on the top of the vehicle body is relatively small, it is chosen to punch holes on the keel side panels 7 of the top frame 1. In an embodiment of the present invention, the keel distribution density on the top frame 1 is less than the keel distribution density on the vehicle body enclosure frame 3, and the keel distribution density on the vehicle body enclosure frame 3 is less than or equal to the keel distribution density on the chassis frame 2. The distribution density of the keel here refers to the number of keels per unit area. In some embodiments of the present invention, in order to enhance the overall strength of the top frame 1, diagonal supports may be provided at the four corners of the frame of the top frame 1, the chassis frame 2, and each keel frame constituting the vehicle body enclosure frame 3 to prevent the above-mentioned keel frame from being deformed. The diagonal support also adopts the above-mentioned C-type keel.

[0054] like Figure 5 The figure is a schematic diagram of the structure of the chassis frame 2. In order to enhance the overall structural strength of the chassis frame 2, at least one group of bottom plates 6 of adjacent longitudinal keels 5 are closely connected and open in opposite directions in the chassis frame 2 to form a reinforced longitudinal beam 14. At least one group of bottom plates 6 of adjacent transverse keels 4 are closely connected and open in opposite directions in the chassis frame 2 to form a reinforced crossbeam 15. The bottom surface of the reinforced longitudinal beam 14 is provided with a longitudinal reinforcing keel 16, and the bottom plates 6 of the longitudinal reinforcing keel 16 are closely connected to the side plates 7 at the bottom of the reinforced longitudinal beam 14, respectively. The bottom surface of the reinforced crossbeam 15 is provided with a transverse reinforcing keel, and the bottom plates 6 of the transverse reinforcing keel are closely connected to the side plates 7 at the bottom of the reinforced crossbeam 15, respectively. The structure of the reinforced longitudinal beam 14 is shown in FIG. Figure 4 As shown, the structure of the reinforcing cross beam 15 is the same as that of the reinforcing longitudinal beam 14, and is not shown in the figure. In this embodiment, one reinforcing longitudinal beam 14 is provided, and the reinforcing longitudinal beam 14 is arranged in the middle of the chassis frame 2. In order to facilitate the installation of wheels, wheel avoidance notches are provided on both sides of the chassis frame 2. Two reinforcing cross beams 15 are provided, and the two reinforcing cross beams 15 are respectively arranged at the front side and the rear side of the wheel avoidance notch.

[0055] The invention also provides a method for manufacturing the above-mentioned lightweight box-structure vehicle body, comprising the following steps:

[0056] S1, assembling the vehicle body frame, this step specifically includes:

[0057] S11, cutting, according to the size of the body frame, select a keel of appropriate length, and process the through hole 9, the positioning connection hole 11 and the punching and drawing groove 12 on the keel part to be connected;

[0058] S12, assembling the keel frame, and assembling the top frame 1, the chassis frame 2, the body side frame and the body front and rear frames respectively according to the structure of the body frame.

[0059] The specific operation method of this step is: first, insert the longitudinal keel 5 in the keel frame through the through hole 9 of the transverse keel 4. During the insertion and installation process, the stamped and drawn groove 12 on the side plate 7 of the transverse keel 4 is overlapped with the stamped and drawn groove 12 on the side plate 7 of the longitudinal keel 5, so as to facilitate the positioning of the positioning connection hole 11. The rivet 13 is used to pass through the positioning connection hole 11, and the longitudinal keel 5 and the transverse keel are riveted together; then, each keel constituting the keel frame is respectively connected to the end of the transverse keel 4 or the longitudinal keel 5, and each keel is connected head to tail (the connection is made by stacking the stamped and drawn groove 12 and riveting with the rivet 13), so as to form a keel frame.

[0060] S13, assemble the assembled keel frames end to end to form a vehicle body enclosure frame 3; during assembly, clamp the front and rear keel frames of the vehicle body between the keel frames on both sides of the vehicle body, and make the front surface of the keel frame at the front end of the vehicle body and the front surfaces of the keel frames on both sides of the vehicle body in the same plane, and make the rear surface of the keel frame at the rear end of the vehicle body and the rear surfaces of the keel frames on both sides of the vehicle body in the same plane.

[0061] S14, placing the body enclosure frame 3 on the chassis frame 2 and connecting them so that the outer frame of the body enclosure frame 3 is flush with the outer frame of the chassis frame 2; here, preferably, screw connection is used to connect the bottom frame of the body enclosure frame 3 with the outer frame of the chassis frame 2.

[0062] S15, connecting the top frame 1 to the upper surface of the vehicle body enclosure frame 3 to form a complete vehicle body skeleton.

[0063] S2, laying body panels on the inner and outer surfaces of the assembled body frame, this step specifically includes:

[0064] S21, cutting, cutting the body panels according to the shapes of the keel frames of the body frame;

[0065] S22, apply adhesive to the frame side panels 7 on the outer and inner surfaces of the vehicle body frame; since the transverse keel 4 and the longitudinal keel 5 of the present invention are provided with narrowing grooves 10 when they are inserted and connected, the inner and outer surfaces of the keel frame after connection are relatively flat, so the vehicle body panel of the present invention can be laid by bonding, and the flatness of the laid vehicle body panel is relatively good.

[0066] S23, bonding the body panel to the inner and outer surfaces of the corresponding body frame; of course, in other embodiments of the present invention, when the body panel and the body frame are made of the same material, the body panel can be laid by welding. The body panel can also be laid by compression molding and foaming vacuum film forming. In order to achieve mass production, taking into account the recyclability, lightweight body, and improve production efficiency, the body frame can adopt a C-shaped keel made of aluminum alloy, and the body panel is also made of aluminum alloy, so as to achieve an all-aluminum body. The body panel and the body frame can be directly connected by laser welding process. The laser welding has high precision and can improve production efficiency. The body panel can also adopt seamless connection strip hanging plate, riveting the body panel to the body frame, and then performing insulation filling and installation of the internal body panel in turn, and reserving some gaps to facilitate the direct riveting connection between the frame and the frame. (The bottom, surroundings, top, and rivet connection of the box body) The external body panel extension is connected to the adjacent keel frame to play an auxiliary reinforcement role, and then riveted with corner pieces.

[0067] S24, welding the adjacent body panels together to complete the laying of the body panels;

[0068] S25, drill a hole in the body frame and install a vacuum nozzle, connect the vacuum device to the vacuum nozzle, and evacuate the space between the inner and outer body panels to a preset pressure, so that a negative pressure is formed in the space between the inner and outer body panels. The purpose of setting the vacuum nozzle and evacuating air is to make the body panel fit tightly against the body frame, so that the adhesive can be firmly bonded. In the subsequent use of the body, when the insulation conditions inside and outside the body are relatively high (for example, the body is used as a cold storage preservation vehicle), a vacuum device can be installed on the body and connected to the vacuum nozzle to continuously perform vacuuming operations, thereby achieving a good insulation effect.

[0069] S3, installing doors and windows on the vehicle body with the vehicle body panels laid;

[0070] S4, decoration, the interior of the car body is decorated with aluminum alloy for full house customization;

[0071] S5, connecting the chassis frame 2 of the finished vehicle body to the chassis beam by rivets or bolts.

[0072] Example 2

[0073] In this embodiment, the method for manufacturing a lightweight box-shaped structure vehicle body comprises the following steps:

[0074] S1, assembling the vehicle body frame, this step specifically includes:

[0075] S11, cutting, according to the size of the body frame, select a keel of appropriate length, and process the through hole 9, the positioning connection hole 11 and the punching and drawing groove 12 on the keel part to be connected;

[0076] S12, assembling the keel frame, and assembling the top frame 1, the chassis frame 2, the body side frame and the body front and rear frames respectively according to the structure of the body frame.

[0077] The specific operation method of this step is: first, insert the longitudinal keel 5 in the keel frame through the through hole 9 of the transverse keel 4. During the insertion and installation process, the stamped and drawn groove 12 on the side plate 7 of the transverse keel 4 is overlapped with the stamped and drawn groove 12 on the side plate 7 of the longitudinal keel 5, so as to facilitate the positioning of the positioning connection hole 11. The rivet 13 is used to pass through the positioning connection hole 11, and the longitudinal keel 5 and the transverse keel are riveted together; then, each keel constituting the keel frame is respectively connected to the end of the transverse keel 4 or the longitudinal keel 5, and each keel is connected head to tail (the connection is made by stacking the stamped and drawn groove 12 and riveting with the rivet 13), so as to form a keel frame.

[0078] S2, laying and assembling the body panels on the inner and outer surfaces of the assembled keel frame, this step specifically includes:

[0079] S201, laying a vehicle body panel on the outer surface of the assembled keel frame;

[0080] S202, filling the interior of the keel frame on which the outer surface vehicle body panels are laid with a thermal insulation material;

[0081] S203, integrally assembling the keel frame filled with thermal insulation material;

[0082] S204, laying body panels inside the integrally assembled body frame.

[0083] S3, installing doors and windows on the vehicle body with the vehicle body panels laid;

[0084] S4, decoration, the interior of the car body is customized with aluminum alloy.

[0085] S5, connecting the chassis frame 2 of the finished vehicle body to the chassis beam by rivets or bolts.

[0086] In summary, the lightweight box-shaped structure vehicle body provided by the present invention adopts C-shaped keel as the material of the vehicle body frame, which reduces the weight of the vehicle body frame while ensuring the strength. The entire vehicle body frame only adopts one keel material, which is convenient for unified procurement, greatly reduces the procurement cost, and reduces the inventory types. The present invention opens a through hole on the transverse keel, so that the longitudinal keel is inserted through the through hole and maintains the overall integrity of the longitudinal keel. The connection is made by riveting, which is simple to construct. The keel frame after connection is an integral whole with greater overall strength. When the keel frame is locally stressed, the force can be well dispersed to reduce the probability of local damage. By setting a stamping and drawing groove at the positioning connection hole, the positioning between the connected keels is facilitated, and the overlapping drawing grooves can also greatly enhance the connection strength. By adopting a C-shaped keel and a riveting connection method, the weight of the vehicle body can be greatly reduced while ensuring the strength, which is of great significance to the development of lightweight vehicle bodies.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lightweight box-structure vehicle body, characterized in that: The vehicle body comprises a vehicle body frame and a vehicle body panel; The vehicle body frame includes a plurality of keel frames, and the plurality of keel frames are enclosed to form the vehicle body frame. The keel frame is composed of keels connected vertically and horizontally, and the cross section of the keel is C-shaped. The keel includes a bottom plate, a side plate and a reinforced side wall. Two side plates are provided, and the two side plates are located at both ends of the bottom plate and are vertically connected to the bottom plate. The reinforced side wall is vertically connected to the free end of the side plate, and the reinforced side wall is located in an opening formed by the two side plates and the bottom plate. The keel frame includes a keel frame, a transverse keel and a longitudinal keel; at least three keels are connected end to end to form the keel frame, the keel openings of the keel frame are all oriented toward the inside of the keel frame, and the transverse keel is connected to the longitudinal keel in a vertical and horizontal manner; The body panels are arranged on the inner surface and the outer surface of the body frame; The keel frame includes a top frame, a chassis frame and a body enclosure frame, and the unit area mass of the keel on the top frame is less than the unit area mass of the keel on the chassis frame; In the chassis frame, at least one group of adjacent longitudinal keels have bottom plates that are closely connected and have opposite opening directions, forming a reinforced longitudinal beam; in the chassis frame, at least one group of adjacent transverse keels have bottom plates that are closely connected and have opposite opening directions, forming a reinforced transverse beam; the bottom surface of the reinforced longitudinal beam is provided with a longitudinal reinforcing keel, and the bottom plates of the longitudinal reinforcing keel are closely connected to the side plates at the bottom of the reinforced longitudinal beam respectively; the bottom surface of the reinforced transverse beam is provided with a transverse reinforcing keel, and the bottom plates of the transverse reinforcing keel are closely connected to the side plates at the bottom of the reinforced transverse beam respectively.

2. The lightweight box-structure vehicle body according to claim 1, characterized in that: A through hole is provided on the bottom plate of the transverse keel, and the longitudinal keel passes through the through hole and is connected to the transverse keel. The side plates of the transverse keel and the longitudinal keel are both located within the upper surface and the lower surface of the keel frame; a narrowing groove is provided on the bottom plate of the longitudinal keel at the connection position, and the width of the longitudinal keel at the connection position is equal to the distance between the inner surfaces of the two side plates of the transverse keel.

3. The lightweight box-structure vehicle body according to claim 1, characterized in that: The side plates of the connected keels are provided with positioning connection holes, and the connecting pieces are inserted into the positioning connection holes to achieve the connection between the keels; The connecting piece is a rivet; The side plate is provided with a stamping and drawing groove, which is recessed in the outer surface of the side plate, and the bottom surface of the stamping and drawing groove protrudes from the inner surface of the side plate; the stamping and drawing groove is a truncated cone groove, and the positioning connection hole passes through the bottom surface of the stamping and drawing groove.

4. The lightweight box-structure vehicle body according to claim 1, characterized in that: The material of the vehicle body panel is aluminum alloy.

5. The lightweight box-structure vehicle body according to claim 1, characterized in that: The side panels of the keel on the top frame are provided with a weight-reducing hollow structure; The weight-reducing hollow structure is a weight-reducing circular hole.

6. A method for manufacturing a lightweight box-structure vehicle body according to any one of claims 1 to 5, characterized in that: The steps include: S1, assembling the body frame; S2, laying body panels on the inner and outer surfaces of the assembled body frame; S3, installing doors and windows on the vehicle body with the vehicle body panels laid to form a finished vehicle body; The S2 specifically includes: S21, cutting, cutting the body panels according to the shapes of the keel frames of the body frame; S22, applying adhesive to the frame side panels on the outer surface and inner surface of the vehicle body frame; S23, bonding the vehicle body panel to the inner and outer surfaces of the corresponding vehicle body frame; S24, welding the adjacent body panels together to complete the laying of the body panels; The S2 further includes: S25, drilling a hole on the body frame and installing an exhaust nozzle, connecting an exhaust device to the exhaust nozzle, and exhausting air in the space between the inner and outer body panels to a preset pressure to form a negative pressure.

7. The method for manufacturing a lightweight box-structure vehicle body according to claim 6, characterized in that: The S1 specifically includes: S11, cutting, selecting a keel of appropriate length according to the size of the vehicle body frame, and processing through holes, positioning connection holes and punching and drawing grooves on the keel parts to be connected; S12, assembling the keel frame, and respectively assembling the top frame, the chassis frame, the body side frame and the body front and rear frames according to the structure of the body frame; S13, assembling the assembled keel frames end to end and connecting them together to form a vehicle body enclosure frame; S14, placing the vehicle body enclosure frame on the chassis frame and connecting them so that the outer frame of the vehicle body enclosure frame is flush with the outer frame of the chassis frame; S15, connecting the top frame to the upper surface of the vehicle body enclosure frame to form a complete vehicle body skeleton.

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