Steel frame for photovoltaic modules and method for manufacturing a steel frame for photovoltaic modules

Abstract

According to the present disclosure, a steel frame for a photovoltaic module is formed by bending a single alloy-plated steel sheet, and the steel frame for the photovoltaic module includes a frame member having an insertion portion into which a photovoltaic panel is inserted and a cavity portion formed with a closed cross section. The alloy-plated steel sheet includes a Mg-Al-Zn-based plating layer on a surface of a steel sheet having a yield strength of 280 MPa to 350 MPa.

Description

Technical Field

[0001] This disclosure relates to the steel frame used in photovoltaic modules and a method for manufacturing the steel frame used in photovoltaic modules. Background Technology

[0002] Typically, photovoltaic modules are power generation devices used outdoors and are required to be durable under extremely harsh conditions such as ultraviolet radiation, wind and snow, salt damage, acid rain, freezing, pollutant accumulation, and the presence of microorganisms.

[0003] Since these photovoltaic modules are primarily installed outdoors, they include a rectangular frame to ensure panel rigidity. The frame uses extruded aluminum to provide an optimized shape for the module, but this method has several drawbacks. First, under heavy loads such as typhoons, the low elongation of the material raises concerns about brittle fracture of the frame. Second, with galvanized aluminum primarily used as the lower support structure, there are concerns about galvanic corrosion due to surface potential differences. Third, extruded aluminum is a material that generates significant amounts of carbon during raw material extraction and processing. While the aluminum frame accounts for 8% to 13% of the total weight of the finished photovoltaic module, it contributes 15% to 20% of the module's carbon emissions. Finally, aluminum is a material with highly volatile raw material prices, affecting the stability of product supply from module suppliers. Summary of the Invention Technical issues

[0004] One aspect of this disclosure is to provide a steel frame for a photovoltaic module and a method for manufacturing the steel frame for the photovoltaic module, wherein the steel frame for the photovoltaic module can ensure strength and rigidity comparable to or higher than that of an aluminum frame. Technical solution

[0005] According to embodiments of the present disclosure, a steel frame for a photovoltaic module is provided. The steel frame for the photovoltaic module includes a frame member formed by bending a single alloy-coated steel sheet, and the frame member has an insertion portion into which a photovoltaic panel is inserted and a hollow portion forming a closed cross-section, wherein the alloy-coated steel sheet includes a Mg-Al-Zn-based coating on the surface of the steel sheet having a yield strength of 280 MPa to 350 MPa.

[0006] The coating may include 2.5% to 3.5% magnesium (Mg), 2.0% to 3.0% aluminum (Al) by mass, and the remainder zinc (Zn).

[0007] The frame members can have a cross-section that, apart from the portion forming the hollow section, consists of an outer panel and an inner panel with overlapping double-sheet structure.

[0008] The frame member may include an upper frame portion located above the insertion portion and a lower frame portion extending from the lower surface of the hollow portion, and a folded joint may be provided in the upper frame portion.

[0009] Multiple riveting joints can be provided in the folded edge joint.

[0010] An adhesive sealant can be applied between the insertion part and the photovoltaic panel.

[0011] The frame member may include an upper frame portion located above the insertion portion and a lower frame portion extending from the lower surface of the hollow portion, and a folded joint may be provided in the lower frame portion.

[0012] Multiple riveting joints can be provided in the folded edge joint.

[0013] The frame members may include long side frame members and short side frame members, and may also include corner key members. The corner key members include a first panel and a second panel intersecting the first panel. The first panel is inserted into the hollow portion of the long side frame member and the second panel is inserted into the hollow portion of the short side frame member to connect the corners of the long side frame members and the short side frame members.

[0014] Corner key components can have a C-shaped cross-section.

[0015] The frame members may be provided with partially deformable and recessed locking portions, and the corner key members may be provided with locking holes in which the locking portions are captured.

[0016] Corner key members can be made of the same material as frame members.

[0017] According to an embodiment of the present disclosure in a method for manufacturing a steel frame for a photovoltaic module, a method for manufacturing a steel frame for a photovoltaic module is provided, wherein the frame components are manufactured using a roll forming process.

[0018] The method may include: preparing a clamping device, the clamping device including a stamping clamp having a protruding locking portion, an insertion clamp having a protrusion insertion groove corresponding to the protruding locking portion, and a disassembly clamp supporting the insertion clamp; inserting the insertion clamp and the disassembly clamp into the hollow portion; and using a press to press the stamping clamp against the frame member to form the locking portion.

[0019] After the locking part is formed, the disassembly jig can be pulled out from the hollow part. Beneficial effects

[0020] According to embodiments of this disclosure, by using alloy-coated steel with excellent corrosion resistance and yield strength, structural stability and durability comparable to or greater than those of aluminum frames can be ensured.

[0021] Furthermore, according to embodiments of this disclosure, carbon emissions can be reduced compared to using an aluminum frame. Attached Figure Description

[0022] Figure 1 This is a perspective view showing a photovoltaic module according to an embodiment of the present disclosure.

[0023] Figure 2 This is a view showing a cross-section of a frame member according to an embodiment of the present disclosure.

[0024] Figure 3 This is a perspective view of a frame component according to an embodiment of the present disclosure.

[0025] Figure 4 This is a cross-sectional view showing the state in which a photovoltaic panel is connected to a frame member according to an embodiment of the present disclosure.

[0026] Figure 5 This is a view showing a cross-section of a frame member according to another embodiment of the present disclosure.

[0027] Figure 6 This is a perspective view of a frame component according to another embodiment of the present disclosure.

[0028] Figure 7 This is an exploded perspective view showing the corner connection portion of the steel frame used in a photovoltaic module according to an embodiment of the present disclosure.

[0029] Figure 8 This is a perspective view showing a corner key component according to an embodiment of the present disclosure.

[0030] Figure 9 This is a perspective view showing a corner key member according to another embodiment of the present disclosure.

[0031] Figure 10 This is a cross-sectional view showing the connection between the corner key member and the frame according to an embodiment of the present disclosure.

[0032] Figure 11 This is a perspective view showing a clamping device according to an embodiment of the present disclosure.

[0033] Figure 12 This is a view showing the operating state of a clamping device according to an embodiment of the present disclosure.

[0034] Figure 13 This is a view showing the state in which the disassembly clamp of the clamping device is separated according to an embodiment of the present disclosure. Detailed Implementation

[0035] The embodiments described in this specification are only the most preferred embodiments of the present invention and do not represent the full technical spirit of the present invention. Therefore, it should be understood that various equivalent solutions or modifications may exist to replace them when this application is filed.

[0036] In addition, the same reference numerals or symbols presented in each of the figures in this disclosure indicate parts or components that perform substantially the same function.

[0037] Furthermore, the terminology used in this disclosure is for describing embodiments and is not intended to limit and / or constrain this disclosure. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this disclosure, terms such as “comprising” or “having” are intended to indicate the presence of the features, numbers, steps, operations, components, portions, or combinations thereof described in this disclosure, and do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, portions, or combinations thereof.

[0038] Additionally, ordinal terms such as “first” and “second” used in this disclosure may be used to describe various components, but components are not limited by these terms, and these terms are used only for the purpose of distinguishing one component from another. For example, a first component may be named a second component without departing from the scope of this disclosure, and similarly, a second component may be named a first component. The term “and / or” includes a combination of multiple related listed items or any one of multiple related listed items.

[0039] Furthermore, in this disclosure, "identical" includes cases that have similar properties or are similar within a certain range. Additionally, "identical" means "substantially identical." Substantially identical should be understood as meaning that values ​​falling within the tolerance range of manufacturing processes, or values ​​corresponding to differences within a range that are not meaningful relative to a reference value, are included in the scope of "identical."

[0040] Additionally, terms such as “…part,” “…device,” “…block,” “…component,” and “…module” can refer to a unit that performs at least one function or operation. For example, these terms can refer to at least one piece of hardware, such as an FPGA (Field Programmable Gate Array) / ASIC (Application-Specific Integrated Circuit), at least one piece of software stored in memory, or at least one process processed by a processor.

[0041] Unless the context explicitly indicates an exception, singular expressions include plural expressions.

[0042] Meanwhile, terms such as “front,” “rear,” “left,” and “right” used in the following description are based on the accompanying drawings, and the shape and position of each component are not limited by these terms.

[0043] In the following, preferred embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings.

[0044] Figure 1 This is a perspective view showing a photovoltaic module according to an embodiment of the present disclosure.

[0045] Reference Figure 1 According to embodiments of the present disclosure, a photovoltaic module 10 may include a photovoltaic panel 11 and a steel frame 20 for the photovoltaic module connected to the edge of the photovoltaic panel 11.

[0046] The steel frame 20 used for the photovoltaic module may include frame members 30 and 40 connected to the edge of the photovoltaic panel 11.

[0047] Frame members 30 and 40 include a pair of long-side frame members 30 surrounding the long side of the photovoltaic panel 11 and a pair of short-side frame members 40 surrounding the short side of the photovoltaic panel 11, and the pair of long-side frame members 30 and the pair of short-side frame members 40 can be connected to each other by corner key members 50.

[0048] Frame members 30 and 40, as well as key member 50, can be formed by bending alloy-coated steel sheets. Considering the effects of local buckling and processing loads, the alloy-coated steel sheets can include a Mg-Al-Zn-based coating on the surface of steel sheets with a yield strength of 280 MPa to 350 MPa. This coating may comprise 2.5% to 3.5% Mg, 2.0% to 3.0% Al, and the remainder Zn by mass. This ensures strength and rigidity comparable to or greater than that of existing aluminum frames. Furthermore, since frame members 30 and 40, as well as key member 50, are made of the same material, corrosion due to the potential difference between the two materials can be prevented.

[0049] Figure 2 This is a cross-sectional view showing a frame member according to an embodiment of the present disclosure. Figure 3 This is a perspective view of a frame component according to an embodiment of the present disclosure, and Figure 4 This is a cross-sectional view showing the state in which a photovoltaic panel is connected to a frame member according to an embodiment of the present disclosure.

[0050] Reference Figures 2 to 4 Frame components 30 and 40 can be manufactured by roll forming alloy-coated steel sheets.

[0051] The long side frame member 30 and the short side frame member 40 that make up the frame members 30 and 40 can each be constructed with the same cross-sectional shape.

[0052] Frame members 30 and 40 may include an insertion portion 60 into which a photovoltaic panel 11 is inserted and a hollow portion 70 having a closed cross-section. The insertion portion 60 and the hollow portion 70 may be formed by repeatedly bending a single alloy-coated steel sheet using roll forming.

[0053] The cross sections of frame members 30 and 40, except for the portion forming the hollow portion 70, can be configured with a double-sheet structure for strength reinforcement.

[0054] Frame members 30 and 40 may include an upper frame portion 21, a side wall frame portion 22, a hollow frame portion 23, and a lower frame portion 24.

[0055] The upper frame portion 21, the side wall frame portion 22, and the lower frame portion 24 can each be configured as a double-sheet structure with overlapping outer and inner panels, and the hollow frame portion 23 forming the hollow portion 70 can be configured as a single-sheet structure.

[0056] The upper frame portion 21 may be located on the upper side of the insertion portion 60, and the side wall frame portion 22 may be located on the lateral side of the insertion portion 60. The insertion portion 60 may be formed by the upper frame portion 21, the side wall frame portion 22, and the upper surface 23a of the hollow frame portion 23.

[0057] A folded joint 80 may be provided in the upper frame portion 21. The folded joint 80 can be formed by bending the end of the outer panel 21a of the upper frame portion 21 to overlap with the inner side of the inner panel 21b.

[0058] Multiple riveting joints 90 may be provided in the folded edge joint 80. The folded edge joint 80 and the inner panel 21b of the upper frame portion 21 can be joined by riveting while overlapping each other.

[0059] An adhesive sealant 100 can be filled between the photovoltaic panel 11 and the insertion portion 60. The folded joint 80 provided in the upper frame portion 21 can help facilitate the filling of the adhesive sealant 100 into the insertion portion 60. The adhesive sealant 100 can evenly transfer the load of the photovoltaic panel 11 to the frame members 30 and 40 through the adhesion and cushioning effect of the photovoltaic panel 11 to the insertion portion 60.

[0060] The hollow frame portion 23 may include an upper surface 23a forming the lower side portion of the insertion portion 60 and the upper portion of the hollow portion 70, two side surfaces 23b and 23c forming the two side surfaces of the hollow portion 70, and a lower surface 23d forming the lower portion of the hollow portion 70. This hollow frame portion 23 may be provided as a single sheet structure.

[0061] The lower frame portion 24 can extend inward from the lower surface 23d of the hollow frame portion 23 (along the direction of the photovoltaic panel). The lower frame portion 24 can be configured as a double-sheet structure with the inner panel 24b and the outer panel 24a overlapping.

[0062] Such frame members 30 and 40 can be manufactured by roll forming in the following order: inner panel 21b of the upper portion of the forming insertion portion 60 of the upper frame portion 21, inner panel 22b of the side wall frame portion 22, upper surface 23a of the hollow portion 70, one side surface 23b of the hollow portion 70, inner panel 24b of the lower frame portion 24, outer panel 24a of the lower frame portion 24, lower surface 23d of the hollow portion 70, other side surface 23c of the hollow portion 70, outer panel 22a of the side wall frame portion 22, outer panel 21a of the upper frame portion 21, and folded joint portion 80.

[0063] Figure 5 This is a view showing a cross-section of a frame member according to another embodiment of the present disclosure, and Figure 6 This is a perspective view of a frame member according to another embodiment of the present disclosure. In the following, the same reference numerals are assigned to the same structures, and detailed descriptions of the same structures are omitted.

[0064] Reference Figure 5 and Figure 6 According to another embodiment of this disclosure, the frame members 30 and 40 are the same as those in the above embodiment except that a folded joint portion 81 is provided in the lower frame portion 24.

[0065] Specifically, a folded joint 81 can be provided in the lower frame portion 24. The folded joint 81 can be formed by bending the end of the outer panel 24a of the lower frame portion 24 to overlap with the inner side of the inner panel 24b. Multiple riveting joints 91 can be provided in the folded joint 81 provided in the lower frame portion 24. These multiple riveting joints 91 can be formed by riveting with the folded joint 81 overlapping with the inner panel 24b of the lower frame portion 24.

[0066] Such frame members 30 and 40 can be manufactured by roll forming in the following order: inner panel 24b of lower frame portion 24, one side surface 23b of hollow portion 70, upper surface 23a of hollow portion 70, inner panel 22b of side wall frame portion 22, inner panel 21b of upper frame portion 21, outer panel 21a of upper frame portion 21, outer panel 22a of side wall frame portion 22, other side surface 23c of hollow frame portion 23, lower surface 23d of hollow frame portion 23, outer panel 24a of lower frame portion 24, and folded joint portion 81.

[0067] Figure 7 This is an exploded perspective view showing the corner connection portion of the steel frame used in a photovoltaic module according to an embodiment of the present disclosure. Figure 8 This is a perspective view showing a corner key member according to an embodiment of the present disclosure. Figure 9 This is a perspective view showing a corner key member according to another embodiment of the present disclosure, and Figure 10 This is a cross-sectional view showing the connection between the corner key member and the frame according to an embodiment of the present disclosure.

[0068] Reference Figures 7 to 10 According to embodiments of the present disclosure, the corner key member 50 may include a first panel 51 and a second panel 52 arranged to intersect each other. The corner key member 50 may be configured as an "L"-shaped corner member. The first panel 51 and the second panel 52 may be configured as members having a C-shaped cross-section or a U-shaped cross-section. Figure 8 As shown, the first panel 51 and the second panel 52, which intersect each other, can be joined together by welding. Alternatively, as... Figure 9 As shown, the first panel 51 and the second panel 52 that intersect each other can be formed by bending and manufacturing individual components.

[0069] The first panel 51 can be inserted into the hollow portion 70 of the long side frame member 30, and the second panel 52 can be inserted into the hollow portion 70 of the short side frame member 40.

[0070] The first panel 51 may include a first contact panel 51a that contacts one side surface 23b of the hollow portion 70 of the long side frame member 30, and a pair of first flanges 51b bent at both ends of the first contact panel 51a. The pair of first flanges 51b may contact the upper surface 23a and lower surface 23d of the hollow portion 70 of the long side frame member 30 when inserted into the hollow portion 70.

[0071] The second panel 52 may include a second contact panel 52a that contacts one side surface 23b of the hollow portion 70 of the short side frame member 40, and a pair of second flanges 52b bent at both ends of the second contact panel 52a. The pair of second flanges 52b may contact the upper surface 23a and lower surface 23d of the hollow portion 70 of the short side frame member 40 when inserted into the hollow portion 70.

[0072] At least one locking hole 53 may be formed through each of the first panel 51 and the second panel 52. The locking hole 53 may be rectangular or square. The locking hole 53 may be provided in the first contact panel 51a and the second contact panel 52a respectively.

[0073] A locking portion 110 disposed in frame members 30 and 40 can be captured and supported in a locking hole 53. The locking portion 110 can be configured to deform a portion of frame members 30 and 40 and protrude toward the hollow portion 70. The locking portion 110 can be located at a position in frame members 30 and 40 corresponding to the portion connected to the key member 50. The locking portion 110 can be disposed on a side surface 23b forming the hollow portion 70 in frame members 30 and 40. The locking portion 110 can be integrally formed with frame members 30 and 40 by being recessed to a certain depth from a side surface 23b of frame members 30 and 40 through stamping. The locking portion 110 can include an entry guide surface 111 and a locking surface 112. The entry guide surface 111 can extend obliquely toward the hollow portion 70 from a side surface 23b of frame members 30 and 40, and the locking surface 112 can extend perpendicularly to a side surface 23b of frame members 30 and 40 at the end of the entry guide surface 111. When the corner key member 50 is inserted and connected to the hollow portion 70 of the frame members 30 and 40, the locking surface 112 of the locking portion 110 is captured and supported by the locking hole 53 of the corner key member 50, thereby allowing the corner key member 50 to be joined to the frame members 30 and 40.

[0074] The locking portions 110 provided in the frame members 30 and 40 can be manufactured using a fixture device. A method for manufacturing the locking portions 110 in the frame members 30 and 40 will be described below.

[0075] Figure 11 This is a perspective view showing a clamping device according to an embodiment of the present disclosure. Figure 12 This is a view showing the operating state of a clamping device according to an embodiment of the present disclosure, and Figure 13 This is a view showing the state in which the disassembly clamp of the clamping device is separated according to an embodiment of the present disclosure.

[0076] Reference Figures 11 to 13 The clamping device 120 that forms the locking portion 110 in the frame members 30 and 40 may include a stamping clamp 121, an insertion clamp 122, and a disassembly clamp 123.

[0077] The stamping fixture 121 may include a locking portion forming a protrusion 121a. The stamping fixture 121 is connected to a press (not shown) and can be moved downwards by operation of the press. The locking portion forming protrusion 121a may be formed in a serrated shape. The stamping fixture 121 may be located outside the hollow portions 70 of the frame members 30 and 40. The stamping fixture 121 may be positioned to face a side surface 23b of the hollow portion 70 of the frame members 30 and 40 with a predetermined gap, and when the stamping fixture 121 is lowered by operation of the press, the stamping fixture 121 may press against a side surface 23b of the frame members 30 and 40.

[0078] An insertion jig 122 can be inserted into the hollow portion 70 of the frame members 30 and 40. The insertion jig 122 can be in close contact with a side surface 23b of the frame members 30 and 40 inside the hollow portion 70. The insertion jig 122 may include a first portion 122a and a second portion 122b. The first portion 122a extends laterally within the hollow portion 70 to be in close contact with a side surface 23b of the frame members 30 and 40, and the second portion 122b extends longitudinally outside the hollow portion 70. The first portion 122a may be provided with a protrusion insertion groove 122c, which corresponds to a locking portion forming protrusion 121a provided on the stamping jig 121. The protrusion insertion groove 122c can accommodate the locking portion forming protrusion 121a while the stamping jig 121 stamps a side surface 23b of the frame members 30 and 40.

[0079] The disassembly clamp 123 can be inserted into the hollow portion 70 of the frame members 30 and 40. The disassembly clamp 123 can be configured to support the bottom of the insertion clamp 122 inserted into the hollow portion 70, i.e., the bottom of the first portion 122a. The disassembly clamp 123 can be inserted into the hollow portion 70 between the insertion clamp 122 and the other side surface 23c forming the hollow portion 70. The disassembly clamp 123 may include a through hole 123a, on which a latch is suspended to facilitate extraction from the hollow portion 70.

[0080] Therefore, in order to form the locking portion 110 in the frame members 30 and 40, such as Figure 12As shown, the first portion 122a of the insertion clamp 122 and the removal clamp 123 are inserted into the hollow portion 70 of the frame members 30 and 40. At this time, the second portion 122b of the insertion clamp 122 can contact the end of one side surface 23b of the frame members 30 and 40. With the insertion clamp 122 and the removal clamp 123 inserted into the hollow portion 70, the insertion clamp 122 can be in close contact with one side surface 23b of the frame members 30 and 40, and the removal clamp 123 can be in close contact with the other side surface 23c of the frame members 30 and 40.

[0081] After insertion of the insertion jig 122 and the disassembly jig 123 into the hollow portion 70 is completed, the locking portion 110 is created by moving the stamping jig 121 with a press to press against one side surface 23b of the frame members 30 and 40. Then, as Figure 13 As shown, when the disassembly clamp 123 is pulled out from the hollow portion 70, the insertion clamp 122 moves downward, making it easy to pull the clamping device 120 out from the hollow portion 70.

[0082] Although the technical spirit of the invention as described above has been illustrated through specific embodiments, the scope of the invention is not limited to these embodiments. Various modifications or variations that can be made by those skilled in the art without departing from the spirit of the invention as defined in the claims will also fall within the scope of the invention.

Claims

1. A steel frame for a photovoltaic module, comprising: A frame member, formed by bending a single alloy-coated steel sheet, having an insertion portion into which a photovoltaic panel is inserted and a hollow portion forming a closed cross-section. The alloy-coated steel sheet has a Mg-Al-Zn-based coating on its surface, which has a yield strength of 280 MPa to 350 MPa.

2. The steel frame used in the photovoltaic module according to claim 1, wherein, The coating comprises 2.5% to 3.5% magnesium (Mg), 2.0% to 3.0% aluminum (Al) by mass, and the remainder is zinc (Zn).

3. The steel frame used for the photovoltaic module according to claim 1, wherein, The cross-section of the frame member, excluding the portion forming the hollow part, is a double-sheet structure with overlapping outer and inner panels.

4. The steel frame used for the photovoltaic module according to claim 3, wherein, The frame member includes an upper frame portion located above the insertion portion and a lower frame portion extending from the lower surface of the hollow portion, and A folded edge joint is provided in the upper frame portion.

5. The steel frame used for the photovoltaic module according to claim 4, wherein, Multiple riveting joints are provided in the folded edge joint.

6. The steel frame used for the photovoltaic module according to claim 4, wherein, An adhesive sealant is provided between the insertion portion and the photovoltaic panel.

7. The steel frame used for the photovoltaic module according to claim 3, wherein, The frame member includes an upper frame portion located above the insertion portion and a lower frame portion extending from the lower surface of the hollow portion, and A folded edge joint is provided in the lower frame portion.

8. The steel frame used for the photovoltaic module according to claim 7, wherein, Multiple riveting joints are provided in the folded edge joint.

9. The steel frame used for the photovoltaic module according to claim 1, wherein, The frame components include long side frame components and short side frame components, and It also includes a corner key member, which includes a first panel and a second panel intersecting the first panel. The first panel is inserted into the hollow portion of the long side frame member and the second panel is inserted into the hollow portion of the short side frame member to connect the corners of the long side frame member and the short side frame member.

10. The steel frame used in the photovoltaic module according to claim 9, wherein, The corner key component has a C-shaped cross-section.

11. The steel frame used in the photovoltaic module according to claim 9, wherein, The frame member is provided with a partially deformable and recessed locking portion, and The corner key component is provided with a locking hole, and the locking part is captured in the locking hole.

12. The steel frame used in the photovoltaic module according to claim 9, wherein, The corner key member is formed of the same material as the frame member.

13. A method for manufacturing a steel frame for a photovoltaic module according to claim 11, wherein, The frame components are manufactured using a roll forming process.

14. The method for manufacturing a steel frame for a photovoltaic module according to claim 13, comprising: A fixture preparation device is provided, the fixture device comprising: a stamping fixture having a locking portion forming a protrusion; an insertion fixture having a protrusion insertion groove corresponding to the locking portion forming a protrusion; and a disassembly fixture supporting the insertion fixture; Insert the insertion clamp and the disassembly clamp into the hollow portion; and The locking portion is formed by pressing the stamping fixture against the frame member using a press.

15. The method for manufacturing a steel frame for a photovoltaic module according to claim 14, wherein, After the locking portion is formed, the disassembly jig is pulled out from the hollow portion.

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