Sheet metal case and manufacturing process thereof

Abstract

The application relates to a sheet metal case and a manufacturing process thereof, and belongs to the field of sheet metal case technology. The application mainly applies to improving the outer surface precision under the condition of simplifying the manufacturing process. The sheet metal case comprises a bottom frame beam frame forming a mounting base, a supporting bottom shell supporting electrical elements, a plane cover plate assembled to an external machine table, and an auxiliary tool for assisting welding. The bottom frame beam frame comprises a first vertical beam, a second vertical beam, and a welding cross beam inserted between the first vertical beam and the second vertical beam to form a to-be-welded group. The auxiliary tool comprises a first tool, the first tool has a first insertion slot inserted into the first vertical beam, a second insertion slot inserted into the second vertical beam, and a limiting plane abutting against the welding cross beam; the first tool is inserted into the first vertical beam and the second vertical beam in parallel with the welding cross beam, and assists in limiting the to-be-welded group, so that welding is facilitated without real-time measurement and correction. The application further provides a manufacturing process of the sheet metal case.

Description

Technical Field

[0001] This application relates to the field of sheet metal chassis technology, and in particular to a sheet metal chassis and its manufacturing process. Background Technology

[0002] Sheet metal refers to the comprehensive cold manufacturing process of thin metal sheets (usually less than 6mm). Sheet metal parts are components manufactured using sheet metal processing techniques. A housing for transformers and power supplies, assembled from multiple sheet metal parts of varying shapes and structures, is called a sheet metal chassis. Because different machines require different functions, the necessary electrical components also vary. Furthermore, the internal space allocated to each machine also differs. Therefore, custom-made sheet metal chassis based on actual needs have become a market necessity.

[0003] Reference Figure 1 A sheet metal chassis with an "I"-shaped bottom frame beam 1 as the mounting base is provided. It includes a first vertical beam 11 and a second vertical beam 12 arranged vertically, and at least one welded crossbeam 13 arranged transversely between them. In related technologies, the first vertical beam 11 is often used as the mounting reference, and then the welded crossbeam 13 is welded to the first vertical beam 11 to form a new reference module. Subsequently, the second vertical beam 12 is welded to the end face of the free end of this reference module, thereby making the bottom frame beam 1 an integral unit, which is convenient for use as a reference for subsequent component assembly.

[0004] Based on the aforementioned technical methods, disassembly is difficult after welding, and the assembly holes are pre-machined before assembly. Therefore, in order to improve the surface precision of the sheet metal chassis and ensure that it can always be assembled according to the reserved assembly holes during the assembly process, multiple measurements must be taken during welding and errors must be corrected in a timely manner to mitigate error accumulation. This results in a relatively cumbersome manufacturing process that is not easy to process and shape. Summary of the Invention

[0005] In order to improve the incompatibility between simplifying the manufacturing process and improving the surface accuracy through real-time measurement in the above-mentioned related technical means, this application provides a sheet metal chassis and its manufacturing process.

[0006] Firstly, this application provides a sheet metal chassis, which adopts the following technical solution.

[0007] A sheet metal chassis includes a bottom frame beam, the bottom frame beam including a first vertical beam, a second vertical beam and a welded crossbeam disposed between the first vertical beam and the second vertical beam, the first vertical beam having a positioning insertion hole for inserting the welded crossbeam, the second vertical beam having the same structure as the first vertical beam and being used for preliminary positioning and assembly into a welding assembly;

[0008] The sheet metal chassis also includes auxiliary tooling, which includes a first tooling arranged parallel to the welding crossbeam. The first tooling is provided with a first slot for insertion into the first vertical beam, a second slot for insertion into the second vertical beam, and a limiting plane abutting against the welding crossbeam. The auxiliary tooling can be inserted into the first vertical beam and the second vertical beam parallel to the welding crossbeam to assist in limiting the welding of the assembly to be welded.

[0009] By adopting the above technical solution, the positioning holes provide an installation position for the welding crossbeam. After the welding crossbeam is inserted into the first and second vertical beams through the positioning hole blocks, the three are initially assembled into a welding assembly. Then, the first tooling is placed parallel to the welding crossbeam so that the first slot is inserted into the first vertical beam and the second slot is inserted into the second vertical beam, thereby limiting the movement of the first and second vertical beams in a direction away from each other. This allows the welding crossbeam to be reliably inserted into the welding assembly, and welding can then be performed without real-time measurement. On the other hand, the first tooling, which can be inserted into the first and second vertical beams, precisely provides the vertical reference required for welding. After insertion, the first tooling is parallel to the welding crossbeam, thus making the welding crossbeam perpendicular to the first and second vertical beams, providing the lateral reference required for welding. The welding reference in the bottom frame beam is transferred from the reference module composed of the first vertical beam and welding crossbeam in related technologies to the first tooling. This ensures that the welding of the bottom frame beam is not affected by the straightness errors of the first vertical beam, second vertical beam, and welding crossbeam. The resulting bottom frame beam has high surface finish, facilitating subsequent assembly of the sheet metal chassis. This improves upon the incompatibility between simplified manufacturing processes and real-time measurement for improved surface finish in related technologies.

[0010] Optionally, the first tooling is integrally formed with a force arm abutting against the first vertical beam and two insertion positioning surfaces extending vertically along the force arm parallel to both sides of the welded crossbeam, the length of the insertion positioning surface corresponding to the length of the welded crossbeam, and the limiting plane formed on the length surface of the insertion positioning surface; the first tooling also includes a first limiting surface and a second limiting surface that are vertically bent along the side of the force arm parallel to the first vertical beam; a first slot is formed between the insertion positioning surface and the first limiting surface, and a second slot is formed between the insertion positioning surface and the second limiting surface;

[0011] The height of both the first slot and the second slot is less than the height of the bottom frame beam, which is used to form a flat reference surface for the flat welding of the bottom frame beam.

[0012] By adopting the above technical solution, the force-applying arm of the first tooling provides the auxiliary working surface required for welding force application. The first limiting surface and the second limiting surface are symmetrical and identical, thus making the first slot and the second slot symmetrical and identical. The force-applying arm is arranged parallel to the large surface in the bottom frame beam. Then, when welding, applying force to the force-applying arm will cause the first slot and the second slot to be compressed and correspondingly abut against the first vertical beam and the second vertical beam, so that the first vertical beam and the second vertical beam are aligned with each other under the abutment pressure. The height of the first limiting surface and the insertion positioning surface is less than the height of the bottom frame beam, thus ensuring that the side of the bottom frame beam without the auxiliary tooling installed maintains complete flatness and forms a flat reference surface, which facilitates the bottom frame beam and the first tooling to be laid flat on the worktable for welding operations.

[0013] Optionally, the sheet metal chassis also includes a supporting base shell for supporting electrical components and a flat cover plate for flat contact with an external machine platform. The flat cover plate is integrally formed with a bent straight edge extending towards the supporting base shell. The supporting base shell has a fastening edge fixedly connected to the bent straight edge. Two sets of the bent straight edge and the fastening edge are symmetrically arranged in a one-to-one correspondence. The supporting base shell is integrally formed with a positioning edge that rests on the welded crossbeam to form an installation reference for the flat cover plate.

[0014] By adopting the above technical solution, the positioning edge of the supporting base shell is erected on the welded crossbeam, thus achieving the initial positioning and installation of the supporting base shell on the bottom frame beam. Then, the flat cover plate is snapped onto the supporting base shell. Through the contact between the bent straight edge and the corresponding snapping edge, the flat cover plate is installed on the bottom frame beam with the supporting base shell as the installation reference. After the supporting base shell is initially installed, it can serve as the installation reference for the flat cover plate, facilitating the assembly of the flat cover plate and the bottom frame beam.

[0015] Optionally, the first vertical beam and the second vertical beam have symmetrical and identical structures, and the first vertical beam has a riveting cavity for accommodating the core-pulling rivets for fixing the first vertical beam and the flat cover plate.

[0016] The riveting cavity has multiple caster through holes on the side away from the flat cover plate. An assembly pad is provided in the riveting cavity. The assembly pad has multiple thickened mounting holes that are coaxially connected to the caster through holes one by one. The number of caster through holes is more than two.

[0017] By adopting the above technical solution, since sheet metal parts are generally thin metal plates less than 6mm thick, there is a problem that it is not convenient to securely install casters (the number of tapping turns is small, making it inconvenient to install screws). A riveting cavity is provided inside the first vertical beam, with pre-drilled holes for casters to pass through. The thickened mounting holes of the assembly pad are coaxially aligned with the caster passing through holes of the first vertical beam, thus transferring the mounting base of the casters from the first vertical beam to the assembly pad, facilitating the secure assembly of the casters. Compared to the method of extending a welding torch into the riveting cavity to weld a nut to each caster passing through hole, the welding method in this application requires fewer weld points and is easier to weld. Furthermore, the assembly pad does not need to be coaxially aligned with each caster passing through hole as with welding nuts, making implementation easier.

[0018] Optionally, the supporting base shell is provided with a plurality of raised truncated cones extending toward the flat cover plate, and the plurality of raised truncated cones are integrally formed on the supporting base shell; the sides of the plurality of raised truncated cones near the flat cover plate are flush to form a locking plane for suspending electrical components, and to form a shock-absorbing space between the bottom wall of the supporting base shell and the locking plane.

[0019] By adopting the above technical solution, the raised frustum facilitates the elevation of the locking plane used to install electrical components, creating a vibration-damping space between the locking plane and the bottom wall of the supporting base. This ensures a distance between the electrical components and the supporting base after installation, thus buffering vibrations generated during operation. The raised frustum is integrally stamped without welding or assembly, saving materials and further simplifying the manufacturing process.

[0020] Secondly, this application provides a manufacturing process for a sheet metal chassis, applicable to the aforementioned sheet metal chassis, comprising the following process steps:

[0021] S1. Use a first and a second tooling, which are parallel to the welding beam and have similar structures, to assist in welding the bottom frame beam;

[0022] S2. Overlap the positioning edge of the supporting bottom shell with the top edge of the first crossbeam to form the installation reference for the flat cover plate;

[0023] S3. Overlap the snap-fit ​​edge of the flat cover plate with the bent straight edge of the supporting base shell to initially install the flat cover plate;

[0024] S4. Insert the wider first tooling into the electrical installation groove reserved in the flat cover plate along the direction from the flat cover plate to the supporting bottom shell, in order to limit the alignment of the flat cover plate with the bottom frame beam;

[0025] S5. Rivet the flat cover plate to the bottom frame beam, and then rivet it to fix the bottom shell after positioning the support with the snap-fit ​​edge as the reference.

[0026] By adopting the above technical solution, the first and second tooling are parallel to the welding crossbeam and can fully engage and fix the assembly to be welded, thereby further improving the surface finish of the bottom frame beam after welding, avoiding error accumulation, and facilitating the precise installation of the subsequent flat cover plate and supporting base shell. After the positioning edge is overlapped with the top edge of the first crossbeam, the installation reference of the supporting base shell is formed; the flat cover plate is fastened relative to the bottom frame beam along the bent straight edge, thus realizing the initial installation of the flat cover plate, supporting base shell, and bottom frame beam. Then, the wider first tooling is fastened along the direction from the flat cover plate to the supporting base shell, so that the insertion positioning surface of the first tooling is inserted into the electrical mounting groove, making the side of the flat cover plate flush with and limited to the side of the bottom frame beam. This prevents the flat cover plate and the bottom frame beam from misaligning due to the gap reserved in the rivet holes during the riveting process, which helps to further improve the surface finish of the sheet metal chassis.

[0027] Furthermore, step S1 includes:

[0028] S11. Insert the welding crossbeam between the first vertical beam and the second vertical beam to form the welding assembly;

[0029] S12. Insert the first tooling between the first crossbeam and the middle crossbeam, and insert the second tooling between the middle crossbeam and the second crossbeam; move the first tooling to abut against the first crossbeam, weld the first crossbeam, move the second tooling to abut against the second crossbeam, and then move the first tooling and the second tooling to abut against the middle crossbeam in both directions, and weld the middle crossbeam.

[0030] S13. Insert multiple third tools one by one along their protruding hollow truncated cones to the side of the bottom frame beam away from the flat cover plate;

[0031] S14. A screw is inserted through the thickened mounting hole along the direction of the third tooling near the assembly pad, and the third tooling is locked to the bottom frame beam by the screw thread engagement.

[0032] S15. Welding assembly pad;

[0033] S16. Grind the welded joints and electroplat the bottom frame beam with environmentally friendly colored zinc.

[0034] By adopting the above technical solution, the first crossbeam is welded using a first tooling, and the second crossbeam is welded using a second tooling. The first and second toolings are moved to bidirectionally abut against the middle crossbeam, thus assisting in the welding of the middle crossbeam and achieving integrated welding assembly of the bottom frame beam. Multiple third toolings are inserted one-to-one along the protruding hollow truncated cones onto the outer bottom surface of the bottom frame beam, and then secured with screws. The screws pass through thickened mounting holes, and it is evident that the diameter of the thickened mounting holes is larger than the screw's diameter. The screws, after installation, limit the assembly pads, facilitating coaxial alignment between the thickened mounting holes and the caster through holes, improving the welding accuracy of the assembly pads. Simultaneously, the method of outsourcing (i.e., electroplating the outer surface) before assembly facilitates the application of environmentally friendly color zinc plating throughout, ensuring the appearance of the assembled sheet metal chassis.

[0035] Furthermore, the process steps for the flat cover plate in step S3 include:

[0036] S31. Laser cutting, cutting the bending groove corresponding to each buckle edge;

[0037] S32. Bending and forming: vertically bending multiple snap-fit ​​edges along the bending groove, with the outer side of the snap-fit ​​edges aligned with the outer side of the flat cover plate;

[0038] S33. Bend the straight edge in a direction away from the bent snap edge.

[0039] By adopting the above technical solution, the bending groove corresponding to each snap-fit ​​edge is first cut out, and then the snap-fit ​​edge is bent into shape. This processing sequence makes it easy to align the outer side of the snap-fit ​​edge with the outer side of the flat cover plate, so as to ensure the accuracy of the outer side of the sheet metal chassis.

[0040] In summary, this application includes at least one of the following beneficial technical effects:

[0041] 1. Facilitates welding and assembly. The first vertical beam, the second vertical beam, and the welding crossbeam inserted between the first and second vertical beams are initially assembled into a welding assembly through positioning holes. The positioning holes provide a foothold for the welding crossbeam, facilitating the formation of the welding assembly. Subsequently, the first and second fixtures are inserted to securely limit the welding assembly, facilitating the welding and assembly of the bottom frame beam. When welding the flat cover plate, the wider first fixture can be fastened to the surface of the flat cover plate to align it with the bottom frame beam, thus facilitating the welding and assembly of the flat cover plate. After the flat cover plate is welded, it can also serve as a welding reference for supporting the bottom shell, eliminating the need for real-time measurement and correction.

[0042] 2. High surface finish. The first and second tooling fixtures assist in welding the bottom frame beam, resulting in a high surface finish after welding. The supporting bottom shell and flat cover plate are then installed using the bottom frame beam as a reference. The first tooling fixture is used to assist in welding the flat cover plate, further enhancing the surface finish of the welded product. Furthermore, a third tooling fixture is used to assist in welding the assembly pads: the third tooling fixture is inserted into the caster through-hole, and a hollow frustum-shaped locking screw is inserted into the thickened mounting hole, providing a coaxial mounting base for the assembly pads. This prevents the assembly pads from shifting or misaligning during welding, resulting in a high surface finish for the welded bottom frame beam. Attached Figure Description

[0043] Figure 1 A schematic diagram of the bottom frame beam structure in the background art is shown;

[0044] Figure 2 The illustration shows an exploded and assembled view of the finished product, consisting of a bottom frame beam, a supporting bottom shell, and a flat cover plate, according to an embodiment of this application.

[0045] Figure 3 The diagram illustrates the structure of the bottom frame beam in the embodiments of this application, as well as the structure after using auxiliary tooling.

[0046] Figure 4 The diagram illustrates the structure of the first tooling in an embodiment of this application.

[0047] Figure 5 A schematic diagram illustrating the welding of assembly pads using a third tooling in an embodiment of this application is shown;

[0048] Figure 6 A partial structural schematic diagram of the planar cover plate in an embodiment of this application is shown.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1. Base frame beam; 11. First vertical beam; 111. Positioning insertion hole; 112. Overlap edge; 113. Riveting cavity; 114. Caster through hole; 12. Second vertical beam; 13. Welded crossbeam; 131. First crossbeam; 132. Second crossbeam; 133. Middle crossbeam; 14. Assembly pad; 141. Thickened mounting hole; 2. Support base shell; 21. Positioning edge; 22. Fastening edge; 23. Elevated truncated cone; 24. 3. Shock-absorbing space; 4. Flat cover plate; 5. Bending straight edge; 6. Electrical installation groove; 7. Bending groove opening; 8. Snap-on edge; 9. Auxiliary tooling; 10. First tooling; 11. Lifting arm; 12. Insertion positioning surface; 13. First limiting surface; 14. First slot; 15. Second limiting surface; 16. Second slot; 17. Second tooling; 18. Third tooling; 19. Hollow truncated cone. Detailed Implementation

[0051] The present application will be further described in detail below with reference to the accompanying drawings.

[0052] This application discloses a sheet metal chassis and its manufacturing process. (Refer to...) Figure 2 This application provides a sheet metal chassis, including a bottom frame beam 1 forming an installation base, a support bottom shell 2 for supporting electrical components, and a flat cover plate 3 for flat contact with an external machine tool for assembly. The support bottom shell 2 and the flat cover plate 3 are riveted to the bottom frame beam 1.

[0053] Reference Figure 3 The bottom frame beam 1 is generally in the shape of an "I" and includes a first vertical beam 11, a second vertical beam 12, and a welded crossbeam 13 inserted between the first vertical beam 11 and the second vertical beam 12. The first vertical beam 11 has a positioning insertion hole 111 for inserting the welded crossbeam 13. The second vertical beam 12 has the same structure as the first vertical beam 11 and also has a positioning insertion hole 111 in the same position and shape. After the welded crossbeam 13 is inserted into the first vertical beam 11, the second vertical beam 12 is then inserted, thus completing the initial assembly to form the assembly to be welded.

[0054] Reference Figure 3 To facilitate welding and fixing, this embodiment of the application also includes an auxiliary tooling 4 for assisting welding. The auxiliary tooling 4 is detachable and used only for assisting welding; it is not shown in the finished product consisting of the bottom frame beam 1, the supporting bottom shell 2, and the flat cover plate 3. (Refer to...) Figure 4The auxiliary tooling 4 includes a first tooling 41 arranged parallel to the welding crossbeam 13. The first tooling 41 is integrally formed with a horizontally arranged force arm 411. The cross-section of the force arm 411 is generally "U" shaped and its length is equal to the width of the bottom frame beam 1, so it can abut against the bottom frame beam 1, thereby providing a force landing point and support for the operator during welding. Two insertion positioning surfaces 412 are provided on the upper and lower sides of the force arm 411 respectively. The length of the insertion positioning surface 412 is equal to the length of the welding crossbeam 13, so that the insertion positioning surface 412 can be inserted into the inner side of the first vertical beam 11 and the second vertical beam 12. The length surface of the insertion positioning surface 412 is set as the limiting plane of the welding crossbeam 13. After insertion, the first tooling 41 is slidable so that the limiting plane abuts against the welding crossbeam 13.

[0055] Reference Figure 3 and Figure 4 The force arm 411 is vertically bent on one side near the first vertical beam 11 to form a first limiting surface 413, and on the other side near the second vertical beam 12 to form a second limiting surface 414. A first slot 4131 is formed between the left side of the insertion positioning surface 412 and the first limiting surface 413, and a second slot 4141 is formed between the right side of the insertion positioning surface 412 and the second limiting surface 414. It is worth noting that the length of the first slot 4131 corresponds to the width of the first vertical beam 11, so that it can be inserted into the first vertical beam 11 so that the first limiting surface 413 abuts against the outside of the first vertical beam 11, thereby limiting the left and right movement of the first vertical beam 11. The first slot 4131 is in the shape of a regular symmetrical "n" shape, and the height of the first slot 4131 is less than the height of the bottom frame beam 1, so that the back of the bottom frame beam 1 maintains a complete flatness and forms a flat reference surface, which facilitates the bottom frame beam 1 to be laid flat against the workbench for welding operations. The second slot 4141 is symmetrical and identical to the first slot 4131, and will not be elaborated on here.

[0056] Reference Figure 3 The first slot 4131 is inserted into the first vertical beam 11, and the second slot 4141 is inserted into the second vertical beam 12, thus limiting the aforementioned assembly to be welded. This eliminates the need for real-time measurement and correction. The bottom frame beam 1 uses the auxiliary fixture 4 as the welding reference, improving upon the incompatibility between simplified manufacturing processes and real-time measurement for improved surface precision found in related technologies. The welding crossbeam 13 includes a first crossbeam 131 at the top, a second crossbeam 132 at the bottom, and a middle crossbeam 133 between them. The auxiliary fixture 4 also includes a second fixture 42 with a similar structure to the first fixture 41 but a smaller width, facilitating precise positioning of the assembly to be welded.

[0057] Reference Figure 3The top wall of the first vertical beam 11 is bent horizontally in a direction that brings them closer together to form two overlapping edges 112. A rivet cavity 113 for installing blind rivets is formed between the overlapping edges 112 and the bottom wall of the first vertical beam 11. This cavity is used to rivet and fix the flat cover plate 3 to the bottom frame beam 1. There is a certain distance between the two horizontal overlapping edges 112 to provide space for installing blind rivets. Since the flat cover plate 3 is mounted on the external machine tool by abutting its surface, the surface of the flat cover plate 3 must maintain complete flatness. Therefore, in this embodiment, the blind rivets in the rivet cavity 113 are all countersunk blind rivets.

[0058] Reference Figure 5 To maintain the flatness of the surface of the flat cover plate 3, an assembly pad 14 for mounting casters is placed on the bottom wall of the riveting cavity 113. The bottom wall of the riveting cavity 113 has multiple caster through holes 114, and the assembly pad 14 has multiple thickened mounting holes 141 corresponding to and coaxially aligned with each caster through hole 114. The number of caster through holes 114 is more than two. Compared to the method of welding nuts one by one, the structure using the assembly pad 14 for thickening has fewer weld points and is easier to weld.

[0059] Continue to refer to Figure 5 The auxiliary tooling 4 also includes four third toolings 43 installed on the outer bottom wall of the bottom frame beam 1, which are centrally symmetrically distributed. Each third tooling 43 extends towards the bottom frame beam 1 and has a hollow frustum 431. The diameter of the caster through hole 114 is equal to the outer diameter of the hollow frustum 431, allowing the third tooling 43 to be inserted and installed on the bottom frame beam 1. Furthermore, both the thickened mounting hole 141 and the through hole of the hollow frustum 431 are threaded holes, but the diameter of the thickened mounting hole 141 is larger than that of the hollow frustum 431, facilitating the insertion of screws to secure the third tooling 43 and forming a coaxial limiting reference for the assembly pad 14.

[0060] Reference Figure 2 and Figure 6 The supporting base shell 2 is integrally formed with a positioning edge 21 that rests on the top wall of the first crossbeam 131, thus enabling the initial installation of the supporting base shell 2. The flat cover plate 3 is integrally formed with a bent straight edge 31 extending towards the supporting base shell 2. The supporting base shell 2 has a fastening edge 22 that is fixedly connected to the bent straight edge 31. One bent straight edge 31 and one fastening edge 22 are configured as an assembly module, and two sets of this assembly module are symmetrically arranged. Thus, after the supporting base shell 2 is installed, the installation reference of the flat cover plate 3 is formed. By erecting the flat cover plate 3 relative to the supporting base shell 2, the initial installation of the flat cover plate 3 can be achieved. It is worth noting that the flat cover plate 3 also has an electrical mounting groove 32 for avoiding the installation of electrical components. The two sides of the electrical mounting groove 32 are flush with the inner sides of the bottom frame beam 1.

[0061] Reference Figure 6The flat cover plate 3 is provided with a snap-fit ​​edge 34 that can be installed with an external machine. In order to further maintain the flatness of the surface of the flat cover plate 3, bending slots 33 are provided on both sides of each snap-fit ​​edge 34 so that the outer side of the snap-fit ​​edge 34 is flush with the outer side of the bottom frame beam 1.

[0062] Reference Figure 1 Furthermore, the supporting base shell 2 extends towards the flat cover plate 3 and is provided with multiple raised frustums 23. The sides of the multiple raised frustums 23 near the flat cover plate 3 are flush to form a locking plane. Electrical components are installed on the locking plane. There is a certain distance between the locking plane and the bottom wall of the supporting base shell 2. The space within this distance range is set as a shock-absorbing space to buffer the vibration generated when the electrical components are operating. Furthermore, in this embodiment of the application, there are 6 raised frustums 23, all of which are integrally stamped and formed without the need for additional welding for raising.

[0063] Reference Figure 2 This application also relates to a manufacturing process for a sheet metal chassis, used for welding the sheet metal chassis described above. The process steps are explained in conjunction with the specific structure of the sheet metal chassis:

[0064] S1. Using a first tooling 41 and a second tooling 42 that are parallel to the welding crossbeam 13 and have similar structures to assist in welding the bottom frame beam 1, real-time measurement is not required and the surface accuracy of the bottom frame beam 1 is improved.

[0065] S2. The positioning edge 21 of the supporting bottom shell 2 is overlapped with the top edge of the first crossbeam 131 to form the installation reference of the flat cover plate 3;

[0066] S3. Overlap the snap-fit ​​edge 22 of the flat cover plate 3 onto the bent straight edge 31 of the supporting base shell 2 to initially install the flat cover plate 3. Before this step, during the processing of the flat cover plate 3, the bending groove 33 corresponding to each snap-fit ​​edge 34 needs to be cut out first, and then the snap-fit ​​edge 34 is bent to form a snap-fit ​​edge 34 to avoid the snap-fit ​​edge 34 protruding outwards.

[0067] S4. Insert the wider first tooling 41 into the electrical installation groove 32 reserved in the flat cover plate 3 along the direction from the flat cover plate 3 to the supporting bottom shell 2, and limit the flat cover plate 3 to align it with the bottom frame beam 1.

[0068] S5. Rivet and fix the flat cover plate 3 to the bottom frame beam 1, so that the flat cover plate 3 can reverse to form the limiting reference for supporting the bottom shell 2. After the bottom shell 2 is limited by the fastening edge 22, it is riveted and fixed.

[0069] Reference Figure 3 In step S1, the processing of the bottom frame beam 1 includes the following steps:

[0070] First, the welding crossbeam 13 is inserted between the first vertical beam 11 and the second vertical beam 12 to form a welding assembly.

[0071] Subsequently, the first tooling 41 is inserted between the first crossbeam 131 and the middle crossbeam 133, and the second tooling 42 is inserted between the middle crossbeam 133 and the second crossbeam 132. The first tooling 41 is moved to abut against the first crossbeam 131, and the first crossbeam 131 is welded. The second tooling 42 is moved to abut against the second crossbeam 132, and then the first tooling 41 and the second tooling 42 are moved to abut against the middle crossbeam 133 in both directions, and the middle crossbeam 133 is welded. Thus, the overall welding of the assembly to be welded is achieved. In this process, the welding reference of the assembly to be welded is not itself, but the first tooling 41 and the second tooling 42. Therefore, the installation error in the assembly to be welded will not accumulate. Moreover, since the first tooling 41 and the second tooling 42 are inserted and limited to the assembly to be welded, the assembly to be welded can be limited without measurement and correction, simplifying the manufacturing process.

[0072] Then, four third tooling 43 are symmetrically inserted into the bottom frame beam 1 along their protruding hollow frustum 431. Screws are inserted into the third tooling 43 in the direction close to the assembly pad 14. The third tooling 43 is locked to the bottom frame beam 1 by threaded engagement with the screws. The screws pass through the thickened mounting hole 141 to form a coaxial mounting reference for the assembly pad 14, which facilitates the installation and limits the position of the assembly pad 14. The assembly pad 14 is then welded and fixed.

[0073] Finally, the outer surface is treated, the welded joints are polished, and the bottom frame beam 1 is electroplated with environmentally friendly colored zinc.

[0074] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the above description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sheet metal chassis, comprising a bottom frame beam (1), wherein the bottom frame beam (1) comprises a first vertical beam (11), a second vertical beam (12), and a welded crossbeam (13) disposed between the first vertical beam (11) and the second vertical beam (12), characterized in that, The first vertical beam (11) is provided with a positioning socket (111) for inserting the welded cross beam (13). The second vertical beam (12) has the same structure as the first vertical beam (11) and is used for preliminary positioning and assembly into a welding group to be welded. The sheet metal chassis further includes an auxiliary tooling (4). The auxiliary tooling (4) includes a first tooling (41) and a second tooling (42) arranged parallel to the welded cross beam (13). The first tooling (41) is provided with a first slot (4131) inserted into the first vertical beam (11), a second slot (4141) inserted into the second vertical beam (12), and a limiting plane abutting against the welded cross beam (13). The first tooling (41) is inserted into the first vertical beam (11) and the second vertical beam (12) parallel to the welded cross beam (13) to assist in limiting and welding the welding group to be welded. The first tooling (41) is integrally formed with a force-applying arm (411) abutting against the first vertical beam (11). The cross-section of the force-applying arm (411) is integrally in an "L" shape and its length is equal to the width of the bottom frame beam frame (1) so as to abut against the bottom frame beam frame (1). The first vertical beam (11) and the second vertical beam (12) have the same symmetrical structure. The sheet metal chassis further includes a support bottom shell (2) for supporting electrical components and a flat cover plate (3) for flatly abutting against an external machine table. The first vertical beam (11) has a riveting cavity (113) for accommodating and fixing a blind rivet for the first vertical beam (11) and the flat cover plate (3). A plurality of caster through holes (114) are reserved on one side of the riveting cavity (113) away from the flat cover plate (3). An assembly cushion block (14) is arranged in the riveting cavity (113). The assembly cushion block (14) is provided with a plurality of thickened mounting holes (141) corresponding to and coaxially docked with the caster through holes (114) one by one. The number of the caster through holes (114) is more than two.

2. The sheet metal chassis according to claim 1, characterized in that, The first tooling (41) is integrally formed with two plug-in positioning surfaces (412) vertically extending corresponding to both sides of the force-applying arm (411) parallel to the welded cross beam (13). The length of the plug-in positioning surfaces (412) corresponds to the length of the welded cross beam (13). The limiting plane is formed on the length surface of the plug-in positioning surfaces (412). The first tooling (41) further includes a first limiting surface (413) and a second limiting surface (414) vertically bent along the side of the force-applying arm (411) parallel to the first vertical beam (11). The first slot (4131) is formed between the plug-in positioning surface (412) and the first limiting surface (413), and the second slot (4141) is formed between the plug-in positioning surface (412) and the second limiting surface (414). The heights of the first slot (4131) and the second slot (4141) are both smaller than the height of the bottom frame beam frame (1) and are used to form a flat laying reference surface for flat laying and welding of the bottom frame beam frame (1).

3. The sheet metal chassis according to claim 2, characterized in that, The flat cover plate (3) is integrally formed with a bent straight edge (31) extending toward the supporting bottom shell (2). The supporting bottom shell (2) has a fastening edge (22) fixedly connected to the bent straight edge (31). The bent straight edge (31) and the fastening edge (22) are symmetrically arranged in two sets. The supporting bottom shell (2) is integrally formed with a positioning edge (21) that is erected on the welded crossbeam (13) to form the installation reference of the flat cover plate (3).

4. The sheet metal chassis according to claim 3, characterized in that, The supporting base shell (2) is provided with a plurality of raised frustums (23) extending toward the flat cover plate (3), and the plurality of raised frustums (23) are integrally formed on the supporting base shell (2); the side of the plurality of raised frustums (23) close to the flat cover plate (3) is flush to form a locking plane for suspending electrical components, and to form a shock-absorbing space between the bottom wall of the supporting base shell (2) and the locking plane.

5. A manufacturing process for a sheet metal chassis, applied to the sheet metal chassis of claim 4, characterized in that, The process includes the following steps: S1. Use the first tooling (41) and the second tooling (42) parallel to the welding crossbeam (13) to assist in welding the bottom frame beam (1); S2. The positioning edge (21) of the supporting bottom shell (2) is overlapped with the top edge of the first crossbeam (131) to form the installation reference of the flat cover plate (3); S3. Overlap the snap-fit ​​edge (22) of the flat cover plate (3) onto the bent straight edge (31) of the supporting bottom shell (2) to initially install the flat cover plate (3); S4. Insert the first tooling (41) into the electrical installation groove (32) reserved in the flat cover plate (3) along the direction from the flat cover plate (3) to the supporting bottom shell (2) to limit the alignment of the flat cover plate (3) to the bottom frame beam (1); S5. Rivet the flat cover plate (3) to the bottom frame beam (1), and then rivet the bottom shell (2) with the fastening edge (22) as the reference for positioning and supporting it.

6. The manufacturing process of the sheet metal chassis according to claim 5, characterized in that, Step S1 includes: S11. Insert the welding crossbeam (13) between the first vertical beam (11) and the second vertical beam (12) to form a welding assembly; S12. Insert the first tooling (41) between the first crossbeam (131) and the middle crossbeam (133), and insert the second tooling (42) between the middle crossbeam (133) and the second crossbeam (132); move the first tooling (41) to abut against the first crossbeam (131), weld the first crossbeam (131), move the second tooling (42) to abut against the second crossbeam (132), and then move the first tooling (41) and the second tooling (42) to abut against the middle crossbeam (133) in both directions, and weld the middle crossbeam (133); S13. Insert multiple third fixtures (43) one by one along their protruding hollow truncated cones (431) to the side of the bottom frame beam (1) away from the flat cover plate (3); S14. A screw is inserted through the thickened mounting hole (141) along the direction of the third tooling (43) near the assembly pad (14), and the third tooling (43) is locked to the bottom frame beam (1) by the screw thread engagement; S15. Welding assembly pad (14); S16. Grind the welded joints and electroplat the bottom frame beam (1) with environmentally friendly colored zinc.

7. The manufacturing process of the sheet metal chassis according to claim 5, characterized in that, The process steps for the flat cover plate (3) in step S3 include: S31. Laser cutting: cut the bending groove (33) corresponding to each buckle edge (34); S32. Bending and forming: vertically bend multiple snap-fit ​​edges (34) along the bending groove (33), with the outer side of the snap-fit ​​edges (34) aligned with the outer side of the flat cover plate (3); S33. Bend the straight edge (31) in a direction away from the bent snap edge (34).

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