Method of manufacturing a metal casing for a sports camera

Abstract

This invention relates to the field of metal processing technology and discloses a method for manufacturing a metal housing for an action camera, comprising the following steps: S1, a first processing hole is formed through the blank along the Z direction, and three protrusions are formed on the outer wall of the blank; S2, a first positioning hole is opened on the protrusions using a CNC machining equipment, and the outer wall and inner wall are machined on the blank; S3, a medium plate is placed in the first processing hole and welded to the inner wall of the blank; S4, a layer of plastic liquid is injected to form a plastic layer; S5, the outer shape, inner cavity, and first side hole are machined using a CNC machining equipment, and the protrusions and excess plastic layer are removed. This invention can position the blank for processing; by using CNC machining and injection molding, the complex metal housing structure can be processed separately, greatly reducing processing difficulty and improving processing accuracy and quality; finally, the excess parts are removed, and the inner cavity is used for positioning during the final outer shape processing, ensuring the normal progress of the processing steps.

Description

Technical Field

[0001] This invention relates to the field of metal processing technology, and in particular to a method for manufacturing a metal housing for an action camera. Background Technology

[0002] The metal housing of an action camera is an essential component, providing not only robust protection but also a unique look and feel. The metal housing can withstand significant external pressure, effectively protecting the camera's delicate internal components from damage. Furthermore, the metal material's excellent heat dissipation properties help maintain a stable temperature during extended shooting sessions, preventing overheating and performance degradation.

[0003] As people pursue personalization, action camera designs have become more diverse. Consequently, the structure of metal housings has become increasingly complex, and the difficulty of surface processing has increased. How to process the surface of metal housings reasonably and precisely has become a challenge. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a method for manufacturing a metal housing for an action camera to solve the problem of difficult metal housing processing.

[0005] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: providing a method for manufacturing a metal housing for an action camera, comprising the following steps:

[0006] S1. An aluminum extrusion profile is formed into a blank, and a first processing hole is formed through the blank along the Z direction. Three protrusions are formed on the outer wall of the blank.

[0007] S2. Use CNC machining equipment to open the first positioning hole on the protrusion, and machine the outer wall and inner wall on the blank;

[0008] S3. A medium plate is placed in the first machining hole and welded to the inner wall of the blank, wherein the medium plate divides the first machining hole into a first chamber and a second chamber distributed along the Z-axis direction, and the openings of the first chamber and the second chamber face away from each other; a gap is formed between the edge of the medium plate and the inner wall of the blank, and the first chamber and the second chamber are connected through the gap;

[0009] S4. Using the gap as a channel for the flow of injection molding liquid, a layer of plastic liquid is injected into the inner wall of the blank so that each inner surface of the first chamber and the second chamber is covered with a plastic layer by the plastic liquid.

[0010] S5. Use CNC machining equipment to process the outer shape, inner cavity and first side hole, and remove the protrusions and excess plastic layer.

[0011] Furthermore, step S2 includes the following sub-steps:

[0012] S21. Define the two sides of the billet distributed along the Z direction as surface A and surface B, and make surface A face up and surface B face down along the Z direction. Use a fixture to fix the billet from the inner wall of the first machining hole. Use a CNC machining device to open the first positioning hole through the Z direction on each protrusion. Then use a fixture to fix the billet using the first positioning hole. Then machine the outer wall of the billet to roughen it.

[0013] S22. With B side facing up and A side facing down, fix the blank using the first positioning hole. Machin the inner wall of the first machining hole from B side to A side. At least two sets of protruding parts are provided on the inner wall of the first machining hole and on the side closer to A side. At least two sets of protruding parts are provided on the inner walls of opposite sides of the first machining hole, and the height of each set of protruding parts is the same.

[0014] S23. Continue to fix the blank with B side facing up and A side facing down using the first positioning hole. Open the second side hole on the outer wall of the blank to connect to the first chamber. Open the first notch groove in the middle of each protrusion along the Z direction to divide the protrusion into the first lug and the second lug along the Z axis.

[0015] Furthermore, in step S22: a plurality of grooves and a plurality of protrusions are recessed on the inner wall of each side of the first machining hole.

[0016] Furthermore, a connecting part is integrally protruded on the side of the middle plate at the position corresponding to each protrusion, and two second positioning holes are opened on the middle plate.

[0017] In step S3: with B side facing up and A side facing down, the blank is fixed using the first positioning hole. The middle plate is gripped through the two second positioning holes and inserted into the first cavity from B side along the Z direction. Each connecting part is supported on each protruding part. There is a welding gap between each connecting part and the inner wall of the first cavity. The connecting part is welded to the protruding part by spot welding at the welding gap, so as to divide the first processing hole into the first cavity and the second cavity.

[0018] Furthermore, in step S3: the gaps are formed between each pair of adjacent connecting portions and between each pair of adjacent protruding portions.

[0019] Furthermore, in step S3: a second notch is provided on each protrusion, and the second notch and the first notch are distributed at intervals along the Z direction.

[0020] Furthermore, in step S3: the surface of the blank is subjected to E treatment after the middle plate is welded.

[0021] Furthermore, in step S4: a plastic layer is formed by nano-injection molding, the plastic layer covers the inner walls of the first chamber and the second chamber to form the inner cavity of the product, and test pieces are used on both surface A and surface B to test the bonding strength.

[0022] Furthermore, in step S4: the plastic layer fills into the second side hole.

[0023] Furthermore, step S5 includes the following sub-steps:

[0024] S51. With side B facing up, fix the blank using the first positioning hole, process the top side of the product from side B, determine the product height, and perform plastic layer finishing to form the inner cavity of the product to remove excess plastic layer.

[0025] S52. With surface A facing up and the blank fixed in the inner cavity, use CNC machining equipment to continue machining along the Z direction toward surface B through the top side of the already machined product to polish the outer wall and form the product shape, so as to remove the protrusion. After machining, the plastic layer in the second side hole separates the shape along the Z direction.

[0026] S53. Make the first side hole on the blank corresponding to the product.

[0027] The method for manufacturing a metal housing for an action camera according to the present invention has at least the following advantages: by setting the protruding part and the first positioning hole, the blank can be positioned for processing; the complex metal housing structure is processed separately by CNC machining and injection molding, which greatly reduces the processing difficulty and improves the processing accuracy and quality; finally, the excess part is removed, and the inner cavity part is used for positioning during the final shape processing to ensure the normal progress of the processing steps. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0029] Figure 1 This is a flowchart of the method for manufacturing the metal housing of an action camera according to the present invention;

[0030] Figure 2 This is a flowchart of the sub-steps of step S2 in this invention;

[0031] Figure 3 This is a flowchart of the sub-steps of step S5 in the invention;

[0032] Figure 4 This is a schematic diagram of the billet structure in step S1 of the present invention;

[0033] Figure 5This is a schematic diagram of the structure of the blank in step S21 of the present invention;

[0034] Figure 6 This is a schematic diagram of the structure of the blank in step S22 of the present invention;

[0035] Figure 7 This is a schematic diagram of the blank from another angle in step S22 of the present invention;

[0036] Figure 8 This is a schematic diagram of the structure of the middle plate of the present invention;

[0037] Figure 9 This is a schematic diagram of the structure of the blank in step S3 of the present invention;

[0038] Figure 10 This is a schematic diagram of the billet structure in step S4 of the present invention;

[0039] Figure 11 This is a schematic diagram of the billet from another angle in step S4 of the present invention;

[0040] Figure 12 This is a schematic diagram of the structure of the blank in step S51 of the present invention;

[0041] Figure 13 This is a schematic diagram of the blank from another angle in step S51 of the present invention;

[0042] Figure 14 This is a schematic diagram of the structure when a portion of the protruding part is removed in step S52 of the present invention;

[0043] Figure 15 This is a schematic diagram of the structure after all the protrusions are removed in step S52 of the present invention;

[0044] Figure 16 This is a schematic diagram of the structure of the blank in step S53 of the present invention.

[0045] The meanings of the labels in the attached diagram are as follows:

[0046] Inner cavity a, outer shape b, circular hole 11, square hole 12, through hole 13, blank 14, first machining hole 15, protrusion 16, first notch groove 161, second notch groove 162, first positioning hole 17, middle plate 18, connecting part 181, second positioning hole 182, A side 191, B side 192, first chamber 20, protrusion 21, protrusion block 211, second chamber 22, groove 231, protrusion 232, plastic layer 24, top side of product 25, test piece 26, first lug 27, second lug 28, second side hole 29. Detailed Implementation

[0047] The invention will now be further described with reference to the accompanying drawings.

[0048] Please refer to Figure 16 The diagram shows the final structure of the metal shell after processing. The metal shell is a square cube structure with a hollow interior containing an inner cavity a and an outer shape b. A middle plate 18 is located within the inner cavity a. A first side hole is formed on the metal shell, comprising a circular hole 11 and a square hole 12 located on opposite side walls of the metal shell. The circular hole 11 is round, and the square hole 12 is rectangular. Additionally, other rectangular square holes 12 are located between one of the adjacent side walls. These other square holes 12 do not penetrate the inner cavity a. For the installation of the optical structure, several through holes 13 of varying shapes are formed on the middle plate 18, each through hole 13 extending along the Z-direction.

[0049] Please refer to Figures 1 to 16 The method for manufacturing the metal housing of an action camera according to the present invention includes the following steps:

[0050] S1. An aluminum extrusion profile is formed into a blank 14. A first processing hole 15 is formed through the blank 14 along the Z direction. Three protrusions 16 are formed on the outer wall of the blank 14.

[0051] Please refer to Figure 4 In step S1, the aluminum extrusion material can be AL6063 and have a square frame structure with dimensions of 53×46.00×26.00mm. The aluminum extrusion with the first processing hole 15 forms a billet 14. The billet 14 weighs approximately 0.051kg and has a material hardness ≥125HV. Three protrusions 16 are provided, all distributed along the Z-direction. Two protrusions 16 are located on adjacent outer side walls of the billet 14, and another protrusion 16 is located at the junction of the two adjacent outer side walls. The protrusion 16 in the middle position is used for error prevention, avoiding incorrect installation of the billet 14 during positioning. The other two protrusions 16 are diagonally distributed. The four corners of the billet 14 are rounded, and the protrusions 16 protrude along the X or Y direction with curved outer walls. For ease of understanding, a three-axis description is used, including the mutually perpendicular X and Y axes in addition to the Z-axis. After the billet 14 is formed, it undergoes a full inspection. Defective products must be promptly removed to prevent further processing and increased costs.

[0052] S2. Using CNC machining equipment, a first positioning hole 17 is opened on the protrusion 16, and the outer wall and inner wall are machined on the blank 14.

[0053] Please refer to Figures 5 to 7 Step S2 includes the following sub-steps:

[0054] S21. Define the two sides of the blank 14 distributed along the Z direction as surface A 191 and surface B 192, and make surface A 191 face upward and surface B 192 face downward along the Z direction. Use a jig to fix the blank 14 with the inner wall of the first machining hole 15. Use a CNC machining equipment to open the first positioning hole 17 through the Z direction on each protrusion 16. Then use the jig to fix the blank 14 with the first positioning hole 17. Then machine the outer wall of the blank 14 to roughen it according to the shape b of the metal shell.

[0055] In step S21: A second chamber 22 is formed around the first machining hole 15 from surface A 191 along the Z direction towards surface B 192. The cross-section of the second chamber 22 is L-shaped, so that the second chamber 22 and the first machining hole 15 are T-shaped as a whole. The second chamber 22 penetrates the first machining hole 15 inward along the X or Y direction. Specifically, the two sides of the groove 231 of the second chamber 22 along the X direction penetrate the first machining hole 15 inward along the X direction, and the two sides of the groove 231 of the second chamber 22 along the Y direction penetrate the first machining hole 15 inward along the Y direction. The second chamber 22 corresponds to a part of the inner cavity of the product. Surface A 191 is also processed to make the height of the entire blank 14 match the height of the product. The outer wall of the blank 14, except for the protrusion 16, is roughened to reduce the thickness of the blank 14.

[0056] S22. With B-side 192 facing upward and A-side 191 facing downward, fix the blank 14 using the first positioning hole 17. Process the inner wall of the first machining hole 15 from B-side 192 toward A-side 191. At least two sets of protruding portions 21 are provided on the inner wall of the first machining hole 15 and on the side closer to A-side 191. At least two sets of protruding portions 21 are respectively provided on the inner walls of opposite sides of the first machining hole 15, and the height of each set of protruding portions 21 is the same.

[0057] In step S22, the external fixture fixes the blank 14 through two diagonally distributed first positioning holes 17, with surface A 191 facing down and surface B 192 facing up in the Z direction. The inner wall of the first machining hole 15 is machined from surface B 192 along the Z direction towards surface A 191, causing the volume of the first machining hole 15 to gradually expand in the X and Y directions to form a square first chamber 20. The volume of the first chamber 20 is larger than the final product cavity a to allow sufficient space for injection molding. To increase the bonding strength between the plastic layer 24 and the first chamber 20 during injection molding, several grooves 231 and several protrusions 232 are recessed on the inner walls of each side of the first chamber 20. This increases the contact area between the plastic layer 24 and the first chamber 20 during injection molding, while also increasing the bonding strength, improving stability, and overall robustness. Both the groove 231 and the protrusion 232 are square block structures with certain angles between them and the inner wall of the first chamber 20, thereby further enhancing the fastening force after the plastic layer 24 is formed and restricting the degree of freedom in the Z direction to ensure the stability of the connection. The side of the first chamber 20 facing surface A 191 does not penetrate surface A 191 but extends to the side of the second chamber 22 facing surface B 192. The length and width of the first chamber 20 are greater than the length and width of the second chamber 22, respectively. After the first chamber 20 extends to the second chamber 22, the second chamber 22 penetrates the first chamber 20 along the Z direction, and the groove wall of the second chamber 22 protrudes inward relative to the first chamber 20, so that the inner wall of the blank 14 facing surface A 191 is constricted relative to the first chamber 20. The protruding part 21 can be configured as two sets, with the two sets of protruding parts 21 respectively arranged on the inner walls of the two sides of the first chamber 20 along the X or Y direction. In another embodiment, the protrusions 21 can be configured as four groups, with the four groups of protrusions 16 distributed on the four inner walls of the first chamber 20. The protrusions 21 are located on the side of the first chamber 20 closest to the second chamber 22 and protrude inward relative to the second chamber 22, so as to support the middle plate 18 during welding and to facilitate connection with the middle plate 18 as a welding point. Each group of protrusions 21 has at least two protruding blocks 211, which are trapezoidal with the narrow side facing inward. The protruding blocks 211 in each group are spaced apart from each other, so that the injection plastic can flow from the second chamber 22 to the first chamber 20 or from the first chamber 20 to the second chamber 22 through the gaps between adjacent protruding blocks 211 during injection molding. The first positioning hole 17 is further widened during the processing of surface B 192, and the two sides where the protrusions 16 connect to the outer wall of the blank 14 are also processed to reduce the material. At this time, the overall thickness of the blank 14 is reduced again.

[0058] S23. Continue to keep B side 192 facing up and A side 191 facing down and fix the blank 14 using the first positioning hole 17. On the outer side wall of the blank 14, open the second side hole 29 that communicates with the first chamber 20 inward. Open the first notch 161 in the middle of each protrusion 16 along the Z direction to divide the protrusion 16 into the first lug 27 and the second lug 28 along the Z axis.

[0059] In step S23, two second side holes 29 are formed on one side wall. Both second side holes 29 are distributed along the Z-direction, and their lengths are greater than the height of the final product. The first notch 161 is formed along the X or Y direction without affecting the formation of the outer wall of the blank 14, thus allowing for material reduction. Finally, the processed blank 14 is cleaned and fully inspected to re-check for any defective products. Defective products must be removed promptly.

[0060] S3. A middle plate 18 is placed in the first machining hole 15 and welded to the inner wall of the blank 14. The middle plate 18 divides the first machining hole 15 into a first chamber 20 and a second chamber 22 distributed along the Z-axis direction. The openings of the first chamber 20 and the second chamber 22 face away from each other. A gap is formed between the edge of the middle plate 18 and the inner wall of the blank 14. The first chamber 20 and the second chamber 22 are connected through the gap.

[0061] Please refer to Figure 8 and Figure 9 As shown in the illustration, the middle plate 18 has a square sheet structure. Connecting portions 181 are integrally formed on the sides of the middle plate 18, corresponding to the positions of each protrusion 21. The connecting portions 181 can be square or trapezoidal, and the number and position of the connecting portions 181 correspond to the number and position of the protrusions 211 for compatibility. Therefore, there is a gap between adjacent connecting portions 181 to facilitate communication between the second chamber 22 and the first chamber 20 through the side of the middle plate 18 during welding or injection molding. Two second positioning holes 182 are provided on the middle plate 18, diagonally distributed, and the corners of the middle plate 18 are rounded. The length and width of the middle plate 18 are smaller than the length and width of the second chamber 22, allowing it to pass freely within it.

[0062] In step S3: With side B 192 facing upwards and side A 191 facing downwards, the blank 14 is fixed using the first positioning hole 17. The middle plate 18 is gripped through the two second positioning holes 182 and inserted into the first chamber 20 along the Z direction from side B 192, moving the middle plate 18 to the side of the first chamber 20 closer to the second chamber 22. Each connecting part 181 is supported on each protruding part 21. To ensure that the middle plate 18 does not shift during welding, it is fixed using the second positioning holes 182 after installation. There is a welding gap between each connecting part 181 and the inner wall of the first chamber 20. The connecting parts 181 are welded to the protruding parts 21 by spot welding at the welding gaps, thereby dividing the first machining hole 15 into the first chamber 20 and the second chamber 22, completing the installation of the middle plate 18.

[0063] In step S3: a second notch 162 is provided on each protrusion 16. The second notch 162 and the first notch 161 are spaced apart along the Z direction to facilitate further material reduction and reduce the difficulty of subsequent finishing. In this embodiment, after the welding of the middle plate 18 is completed, it undergoes a full inspection. The surface of the qualified blank 14 is subjected to E treatment, and a process method is used to form a special film or change its properties on the surface of the blank 14. Then, a full inspection is carried out again.

[0064] S4. Using the gap as a channel for the flow of injection molding liquid, a layer of plastic liquid is injected into the inner wall of the blank 14 so that each inner surface of the first chamber 20 and the second chamber 22 is covered with a plastic layer 24 by the plastic liquid.

[0065] Please refer to Figure 10 and Figure 11 In step S4: A plastic layer 24 is formed by nano-injection molding. The plastic layer 24 covers the inner walls of the first chamber 20 and the second chamber 22 to form the product cavity a. The blank 14 is fixed, and an inner mold is set within the first chamber 20 and the second chamber 22. The inner mold is adapted to the features of the product cavity a, forming a flow channel that is interconnected through gaps between the inner mold and the first and second chambers 20 and 22. Molten plastic is injected and allowed to solidify, forming the product cavity a after solidification. Test pieces 26 are used on both surface A 191 and surface B 192 to test the bonding force between the plastic layer 24 and the blank 14. The flatness is controlled to 0.01 mm during injection molding, and a full inspection is performed after injection molding. During injection molding, the plastic layer 24 fills into the second side hole 29. It can fill the side closest to the inner wall of the first processing hole 15, or it can fill the entire second side hole 29, but the thickness of the injection portion within the second side hole 29 must be greater than or equal to the thickness of the product.

[0066] S5. Use CNC machining equipment to process the outer shape b, inner cavity a and first side hole, and remove the protrusion and excess plastic layer 24.

[0067] Please refer to Figures 12 to 15 Step S5 includes the following sub-steps:

[0068] S51. With B side 192 facing upward, fix the blank 14 using the first positioning hole 17, process the top side 25 of the product from B side 192, determine the product height, and perform fine finishing of the plastic layer 24 to form the inner cavity a of the product, so as to remove excess plastic layer 24.

[0069] S52. With A side 191 facing upward and the blank 14 fixed in the inner cavity a, the CNC machining equipment is used to continue processing along the Z direction toward B side 192 through the already processed product top side 25 to form the product shape b by polishing the outer wall, so as to remove the protrusion 16. After processing, the plastic layer in the second side hole 29 separates the shape b along the Z direction.

[0070] S53. A first side hole is made on the blank 14 corresponding to the product.

[0071] In step S51, the flatness is controlled to be 0.05mm. The excess injection molding part is removed from side B 192 and the top side edge of the product is processed to initially process the top side 25 and determine the height position of the product.

[0072] In step S52, the flatness is also controlled to be 0.05mm. The blank 14 is fixed through the second positioning hole 182, or directly through the cavity wall of the inner cavity a. Then, it is machined along the Z-phase from surface A 191 to surface B 192 to the top side 25 of the product, thus completing the processing of the product shape b. After the outer wall is polished, the position of the second side hole 29 is replaced by a plastic layer 24. The plastic layer 24 at the position of the second side hole 29 completely separates the metal part of the product and the blank part during processing in the Z-axis. If the plastic layer 24 at the position of the second side hole 29 is opened on one of the two sides in the X-axis, it also separates the metal part of the product in the X-axis. If the position of the second side hole 29 is located on one of the two sides in the Y-axis, it also separates the metal part of the product in the Y-axis. This avoids the product from affecting signal reception during use. The plastic separation can ensure signal reception. Then, the billet 14 is subjected to full inspection. The billet 14 that passes the full inspection is rough-ground and cleaned. After cleaning and drying, it is subjected to full inspection again.

[0073] In step S53, the blank 14 is fixed with surface A 191 facing upwards using the product cavity a or the second positioning hole 182. A first side hole penetrating the product cavity a, namely a circular hole 11 and a square hole 12, is made on the blank 14. The circular hole 11 is located on the same side as the second side hole 29 and between the plastic layers 24 of the two metal partitions. One of the square holes 12 is located on the opposite side of the circular hole 11, facilitating the use of the probe. After cleaning and full inspection, fine grinding, cleaning, and full inspection are performed. Subsequently, sandblasting and anodizing are performed sequentially. After full inspection after sandblasting and anodizing, the action camera assembly is completed, and after a final full inspection, it is packaged and shipped.

Claims

1. A method for manufacturing a metal housing for an action camera, characterized in that, Includes the following steps: S1. An aluminum extrusion profile is formed into a blank, and a first processing hole is formed through the blank along the Z direction. Three protrusions are formed on the outer wall of the blank. S2. Use CNC machining equipment to open the first positioning hole on the protrusion, and machine the outer wall and inner wall on the blank; Step S2 includes the following sub-steps: S21. Define the two sides of the billet distributed along the Z direction as surface A and surface B, and make surface A face up and surface B face down along the Z direction. Use a fixture to fix the billet from the inner wall of the first machining hole. Use a CNC machining device to open the first positioning hole through the Z direction on each protrusion. Open the second chamber connected to the first machining hole from surface A around the first machining hole along the Z direction towards surface B. Then use a fixture to fix the billet using the first positioning hole. Then machine the outer wall of the billet to roughen it. S22. With B side facing up and A side facing down, fix the blank using the first positioning hole. Process the inner wall of the first processing hole from B side towards A side, so that the first processing hole is widened in the X and Y directions to form a first chamber with a size larger than the inner cavity size of the product. At least two sets of protruding parts are provided on the inner wall of the first processing hole and on the side closer to A side, and at least two sets of protruding parts are provided on the inner walls of opposite sides of the first processing hole, and the height of each set of protruding parts is the same. S3. A medium plate is placed in the first machining hole and welded to the inner wall of the blank, wherein the medium plate divides the first machining hole into a first chamber and a second chamber distributed along the Z-axis direction, and the openings of the first chamber and the second chamber face away from each other; a gap is formed between the edge of the medium plate and the inner wall of the blank, and the first chamber and the second chamber are connected through the gap; S4. Using the gap as a channel for the flow of injection molding liquid, a layer of plastic liquid is injected into the inner wall of the blank so that each inner surface of the first chamber and the second chamber is covered with a plastic layer by the plastic liquid. S5. Use CNC machining equipment to process the outer shape, inner cavity and first side hole, and remove the protrusions and excess plastic layer.

2. The method for manufacturing a metal housing for an action camera as described in claim 1, characterized in that, Step S2 further includes the following sub-steps: S23. Continue to fix the blank with B side facing up and A side facing down using the first positioning hole. Open the second side hole on the outer wall of the blank to connect to the first chamber. Open the first notch groove in the middle of each protrusion along the Z direction to divide the protrusion into the first lug and the second lug along the Z axis.

3. The method for manufacturing a metal housing for an action camera as described in claim 2, characterized in that, In step S22: a plurality of grooves and a plurality of protrusions are recessed on the inner wall of each side of the first machining hole.

4. The method for manufacturing a metal housing for an action camera as described in claim 3, characterized in that, A connecting part is integrally protruded on the side of the middle plate and at the position corresponding to each protrusion, and two second positioning holes are opened on the middle plate. In step S3: with B side facing up and A side facing down, the blank is fixed using the first positioning hole. The middle plate is gripped through the two second positioning holes and inserted into the first cavity from B side along the Z direction. Each connecting part is supported on each protruding part. There is a welding gap between each connecting part and the inner wall of the first cavity. The connecting part is welded to the protruding part by spot welding at the welding gap, so as to divide the first processing hole into the first cavity and the second cavity.

5. The method for manufacturing a metal housing for an action camera as described in claim 3, characterized in that, In step S3: the gaps are formed between each pair of adjacent connecting parts and between each pair of adjacent protruding parts.

6. The method for manufacturing a metal housing for an action camera as described in claim 4, characterized in that, In step S3: a second notch is provided on each protrusion, and the second notch and the first notch are distributed at intervals along the Z direction.

7. The method for manufacturing a metal housing for an action camera as described in claim 5, characterized in that, In step S3: the surface of the blank is subjected to E treatment after the middle plate is welded.

8. The method for manufacturing a metal housing for an action camera as described in claim 7, characterized in that, In step S4: a plastic layer is formed by nano-injection molding, which covers the inner walls of the first and second chambers to form the inner cavity of the product, and test pieces are used on both surface A and surface B to test the bonding strength.

9. The method for manufacturing a metal housing for an action camera as described in claim 8, characterized in that, In step S4: the plastic layer fills into the second side hole.

10. The method for manufacturing a metal housing for an action camera as described in claim 7, characterized in that, Step S5 includes the following sub-steps: S51. With side B facing up, fix the blank using the first positioning hole, process the top side of the product from side B, determine the product height, and perform plastic layer finishing to form the inner cavity of the product to remove excess plastic layer. S52. With surface A facing up and the blank fixed in the inner cavity, use CNC machining equipment to continue machining along the Z direction toward surface B through the top side of the already machined product to polish the outer wall and form the product shape, so as to remove the protrusion. After machining, the plastic layer in the second side hole separates the shape along the Z direction. S53. Make the first side hole on the blank corresponding to the product.

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