Metal shell forming processing technology and metal shell for electronic equipment

Abstract

The invention relates to the technical field of electronic equipment metal part processing, and discloses a metal shell forming processing technology and a metal shell for electronic equipment, and the metal shell forming processing technology comprises the following steps: S1, a processing shape is designed according to the requirement of a product to form a plate, the plate is provided with a processing surface, and a processing area corresponding to a plastic part structure needing to be formed is formed on the processing surface; and finally, a molding structure is formed on the processing area through processing. S2, a selected plastic material is combined with the molding structure through an injection molding machine until the plastic material is molded to form an injection molding part, and thus a molded blank is formed; and S3, the formed blank is sequentially subjected to polishing, sand blasting and anodic treatment. By arranging the molding structure, the T treatment process is reduced, the quality of the plate is improved, the use of the plastic material is not limited by the T treatment process any more, any injection molding material can be used, the diversification and economy of the material are improved, the cost of the T treatment process is reduced, and the processing efficiency is improved by reducing the process steps.

Description

Technical Field

[0001] The present invention relates to the technical field of metal parts processing of electronic equipment, and in particular to a metal shell forming processing technology and a metal shell for electronic equipment. Background Art

[0002] As one of the electronic devices, the metal shell of the laptop computer is often made of aluminum, magnesium alloy or aluminum alloy to meet the characteristics of lightness, wear resistance, good heat insulation and high strength.

[0003] The metal shell needs to be processed by injection molding in the process of material selection. The conventional processing method is to use T treatment process or glue to paste the material. The T treatment process is to corrode the surface of the product to produce nano-scale honeycomb meshes, and retain the coupling agent attached during the T treatment process in the mesh. During injection molding, the injection molding material and the coupling agent are chemically reacted by rapid heating, so as to be firmly connected. This processing method not only damages the material, but also the injection molding material must use specific plastic materials such as PPS (polyphenylene sulfide), PBT (polybutylene terephthalate), nylon, etc. to complete the injection molding process. These specific plastic materials are relatively expensive and the use of injection molding materials is limited. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: to provide a metal shell forming processing technology and a metal shell for electronic equipment to solve the problem that the traditional metal shell processing method uses a T-processing process to complete the material selection and the connection between the injection molded parts is damaged and the material selection is limited.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a metal shell forming process comprising the following steps:

[0006] S1. According to the needs of the product, a processing shape is designed to form a plate, the plate has a processing surface, a processing area is formed on the processing surface corresponding to the plastic part structure to be formed, and finally a plastic structure is formed on the processing area;

[0007] S2, using the selected plastic material to combine it with the plastic structure by using an injection molding machine until the plastic material is formed into an injection molded part, thereby forming a molded blank;

[0008] S3, grinding, sandblasting and anodizing the formed blank in sequence.

[0009] Furthermore, the step S1 includes the following sub-steps:

[0010] S11. When the plate is stamped and formed, the processing area is defined as a first processing area when the processing area is a local edge portion at the edge or corner of the processing surface on the plate, and the plastic structure includes a barb structure formed on the first processing area when the plate is stamped and formed.

[0011] Furthermore, in the S11 step: the side of the plate facing away from the processing surface is defined as the back side surface, and the barb structure formed after the plate is stamped and formed includes a barb portion extending from the first processing area toward the side away from the back side surface, and the barb portion is inclined inward relative to the plate along the horizontal distribution direction of the plate, and the barb structure also includes a coupling groove recessed at the first processing area of ​​the back side surface corresponding to the barb portion where the barb portion is located, and the coupling groove is open outward relative to the plate along the horizontal distribution direction of the plate.

[0012] Furthermore, in the S2 step: after injection molding, the injection molded part is combined with the position of the barb structure to form a first combining part wrapped on the outer edge of the barb part and the first processing area, and a second combining part filled in the combining groove, and the second combining part is flush with the back side surface to enable the injection molded part to be combined with the barb structure by mortise and tenon joints.

[0013] Furthermore, the step S1 includes the following sub-steps:

[0014] S12, the sheet is stamped and formed, and when the processing area is a portion of the sheet located within the edge or corner of the processing surface, it is defined as a second processing area, and the plastic structure includes a hook groove structure formed by CNC equipment on the second processing area.

[0015] Furthermore, in the step S12: a groove is machined on the second machining area using CNC equipment, and the groove walls on both sides of the groove are tilted away from the machining surface so that the bottom of the groove is widened relative to the groove opening and inner angles are formed on both sides of the bottom of the groove, so that the groove walls on both sides of the groove are located between one side of the groove opening and the machining surface to form a barb portion.

[0016] Furthermore, in the step S12: the inner corner is formed by the groove bottom surface and the side groove wall, and the barb portion is formed by the side groove wall and the processed surface.

[0017] Furthermore, in the S12 step: the groove is connected to the plate toward the side away from the processing surface, the side groove wall is processed with a first arm segment on the side close to the processing surface and a second arm segment on the side away from the processing surface from the first arm segment, the second arm segments are inclined away from the processing surface on the side, the inner angle is formed by the side of the plate away from the processing surface and the second arm segment, and the hook portion is formed by the first arm segment, the second arm segment and the processing surface.

[0018] Furthermore, in the step S2: after injection molding, the injection molded part is molded at the position of the hook groove structure to have a third joint part filled in the groove to be combined with the hook groove by mortise and tenon joints.

[0019] The present invention also provides a metal shell for electronic equipment including the above-mentioned plastic-bonding structure.

[0020] The metal shell forming processing technology and the metal shell for electronic equipment of the present invention have at least the following beneficial effects: by arranging a plastic structure on the processing area of ​​the plate, there is no need to use the T-treatment process, which not only improves the quality of the plate, but also ensures the connection stability between the injection molding part and the plate. The use of plastic materials is no longer limited by the T-treatment process and any injection molding material can be used, which improves the diversity and economy of materials, reduces the cost of the T-treatment process, and increases processing efficiency by reducing process steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0022] Figure 1 It is a flowchart of the metal shell forming process of the present invention;

[0023] Figure 2 It is a flowchart of the sub-steps of step S1 of the present invention;

[0024] Figure 3 It is a schematic diagram of the partial structure of the plate and the plastic structure in step S1 of the first embodiment of the present invention;

[0025] Figure 4 It is a schematic diagram of the partial structure of the molded blank in step S1 of the first embodiment of the present invention;

[0026] Figure 5 This is a schematic structural diagram of a plate and a plastic structure in step S1 of the second embodiment of the present invention;

[0027] Figure 6 It is a front cross-sectional view of the plate and the plastic structure in step S2 of the second embodiment of the present invention;

[0028] Figure 7 for Figure 6 An enlarged schematic diagram of part A is shown;

[0029] Figure 8 This is a schematic structural diagram of a molded blank in step S2 of the second embodiment of the present invention;

[0030] Fig. 9It is a front cross-sectional view of the formed blank in step S2 of the second embodiment of the present invention;

[0031] Fig.10 for Fig. 9 An enlarged schematic diagram of portion B is shown;

[0032] Fig.11 This is a schematic structural diagram of a plate and a plastic structure in step S1 of the third embodiment of the present invention;

[0033] Fig.12 It is a front cross-sectional view of the plate and the plastic structure in step S1 of the third embodiment of the present invention;

[0034] Fig.13 This is a schematic structural diagram of a preform in step S2 of the third embodiment of the present invention;

[0035] Fig.14 It is a front cross-sectional view of the formed blank in step S2 of embodiment 3 of the present invention.

[0036] The meanings of the symbols in the accompanying drawings are:

[0037] Plate 1, processing surface 11, first processing area 121, second processing area 122, back side surface 13, injection molding part 2, first connecting part 21, second connecting part 22, third connecting part 23, barb structure 31, barb part 311, connecting groove 312, hook groove structure 32, groove 321, inner corner 3211, barb part 3212, first arm segment 3213, second arm segment 3214. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings.

[0039] Please refer to Figures 1 to 14 The metal shell forming process of the present invention comprises the following steps:

[0040] S1. According to the needs of the product, a processing shape is designed to form a plate 1, the plate 1 has a processing surface 11, a processing area is formed on the processing surface 11 corresponding to the plastic part structure to be formed, and finally a plastic structure is formed on the processing area;

[0041] S2, using the selected plastic material to combine it with the plastic structure by using an injection molding machine until the plastic material is formed into an injection molding part 2, thereby forming a molded blank;

[0042] S3, grinding, sandblasting and anodizing the formed blank in sequence.

[0043] In step S1, the plate 1 is usually made of one of magnesium alloy, aluminum alloy and magnesium-aluminum alloy and is stamped by a traditional stamping process to stamp out the required product shape. It can also be formed by forging and other methods, which is not limited to this embodiment. The specific shape is determined according to the actual product requirements, but it is usually a sheet structure. Some plates 1 have a frame, and the specific structure is not described in detail here. The plate 1 has a certain thickness and a thickness direction. One of the sides of the plate 1 along the thickness direction is defined as a processing surface 11, and the other side of the plate 1 along the thickness direction is defined as a back side 13, and the back side 13 is distributed away from the processing surface 11 in the thickness direction. In the present invention, a processing area is reserved on the processing surface 11 at the position where the plastic part structure to be formed is designed according to the design needs of the manufacturer, etc. A plastic structure is processed on the processing area corresponding to the plastic part structure. In other embodiments, the processing surface 11 changes according to different processing areas of different products.

[0044] In step S1, the processing area includes a first processing area 121 located at the edge and corner of the processing surface 11 and a second processing area 122 located at the inner part of the edge and corner of the processing surface 11, wherein the first processing area 121 is located at the edge area of ​​the plate 1, which is located at the cutoff part of the plate 1; the second processing area 122 is located on the plate surface of the plate 1, and the second processing area 122 is surrounded by the plate 1 and located inside thereof. Any plate 1 may have both the first processing area 121 and the second processing area 122; in another embodiment, the plate 1 only has the first processing area 121; in another embodiment, the plate 1 only has the second processing area 122.

[0045] Please refer to Figure 3 and Figure 4 In the first embodiment, step S1 includes the following sub-steps:

[0046] S11, the plate 1 is stamped and formed. When the processing area is a local edge portion of the plate 1 at the edge or corner of the processing surface 11, it is defined as the first processing area 121. The plastic structure includes a barb structure 31 formed on the first processing area 121 when the plate 1 is stamped and formed.

[0047] Each corner of the plate 1 has an L-shaped notch and a part is missing. The processing area of ​​the plate 1 includes a first processing area 121. The first processing area 121 is L-shaped and located at each corner of the metal shell. It is formed by the edges of the missing parts of each corner of the plate 1. The corresponding injection molding part 2 completes the missing part of the plate 1 where the first processing area 121 is located to make it present a complete square or other shaped structure. In another embodiment, the first processing area 121 can be any side of the plate 1 that needs to be completed by the injection molding part 2. The plastic structure includes a barb structure 31 formed on the first processing area 121. Since the first processing area 121 is at the edge of the plate 1, the slotting method is obviously not suitable for this situation. Therefore, the barb structure 31 is stamped integrally with the plate 1.

[0048] In step S11: in order to facilitate the stamping and demoulding of the barb structure 31 and the plate 1, and to better lock with the injection molding part 2 during injection molding, the barb structure 31 includes a barb portion 311 extending from the first processing area 121 toward the side away from the back side 13, and a coupling groove 312 recessed from the first processing area 121 of the back side 13 corresponding to the barb portion 311. The barb portion 311 is convenient for locking with the injection molding part 2 to hook the injection molding part 2, so that the connection between it and the plate 1 is more secure, and the coupling groove 312 further increases the contact surface with the injection molding part 2 to enhance the bonding force. Among them, the barb portion 311 is inclined inwardly relative to the plate 1 along its horizontal distribution direction, that is, the extension direction of the plate 1 is its horizontal distribution direction. For example, when the plate 1 is rectangular, the direction of its length and width is its horizontal distribution direction; if the plate 1 is circular, any diameter direction is its horizontal distribution direction. The first processing area 121 has a side facing the plate 1 in the horizontal distribution direction of the plate 1 as its inner side, and conversely, a side facing away from the plate 1 in the horizontal distribution direction as its outer side. The inclined barb 311 allows the injection molding part 2 to be limited by the barb 311 in both the thickness direction and the horizontal distribution direction relative to the plate 1 after it is combined with the barb 311, so that it cannot be separated. Among them, the combining groove 312 opens outward relative to the plate 1 along its horizontal distribution direction, and the combining groove 312 opens on the side away from the processing surface 11 in the thickness direction of the plate 1, so that when the mold is used to perform injection molding of the injection molding part 2, the plastic material can wrap the entire first processing area 121 and the edge of the plate 1 where it is located. The setting of the combining groove 312 can not only be well combined with the injection molding part 2, but also can be completed along the thickness direction of the plate 1 during demoulding. The stamping molding method is not only convenient for production, but also has sufficient strength to support the injection molding part 2.

[0049] In step S2, the shape profile of the injection molding part 2 corresponds to the shape profile of the plastic part structure, so that the processing area forms the injection molding part 2 after the injection molding process and finalization. The injection molding part 2 is combined with the plastic structure during injection molding, and after the injection molding part 2 is finalized, it is matched with the plastic structure by mortise and tenon joints, and the injection molding part 2 can be firmly fixed on the plate 1 without the need for a T-treatment process. This process will not damage the plate 1, and the metal shell reduces the T-treatment process during the processing, greatly improving the output efficiency and simplifying the processing process. Compared with the expensive T-treatment process, the present embodiment has lower costs and is more environmentally friendly, and improves the yield to a certain extent.

[0050] In step S2: the injection molding part 2 is adapted to the barb structure 31 and complements the missing part of the plate 1, and its thickness is consistent with the thickness of the plate 1, so that the plate 1 forms a complete metal shell and can be used as a metal part of an electronic device such as a metal shell of a laptop computer. The part of the injection molding part 2 that contacts the first processing area 121 has a first combination part 21 wrapped on the outer side of the barb part 311 and the first processing area 121, and a second combination part 22 penetrated into the combination groove 312. Among them, the second combination part 22 is flush with the back side surface 13 to just fill the entire combination groove 312 and ensure the flatness of the back side surface 13 of the entire plate 1. The first combination part 21 and the second combination part 22 are surrounded by a groove body with the same shape as the barb structure 31, so that the entire barb structure 31 is wrapped inside it, and the barb structure 31 is combined with the mortise and tenon joints to be encapsulated and molded, so that it has sufficient bonding force to ensure firmness.

[0051] Please refer to Figures 5 to 10 In the second embodiment, step S1 further includes the following sub-steps:

[0052] S12, the sheet 1 is stamped and formed. When the processing area is the portion of the sheet 1 located within the edge and corner of the processing surface 11, it is defined as the second processing area 122. The plastic structure includes a hook groove structure 32 formed on the second processing area 122 using CNC equipment.

[0053] In step S12, a second processing area 122 is formed on the plate 1, and the second processing area 122 is distributed at various positions of the processing surface 11. The specific structure and position of the injection molding part 2 in step S2 are designed according to the actual electronic device and protrude from the processing surface 11. In order to better combine the injection molding part 2 with the second processing area 122 and simplify the injection molding operation, the plastic structure includes a hook groove structure 32 on the second processing area 122 using a CNC device, and the thickness of the plate 1 is fixed. For this purpose, the hook groove structure 32 includes a groove 321 recessed in the second processing area 122 at a processing position on the second processing area 122 using a CNC device, and the side walls of the groove 321 are inclined away from the side of the processing surface 11, so that the cross section of the groove 321 is trapezoidal and the groove bottom of the groove 321 is widened relative to the notch, and inner corners 3211 are formed on both sides of the groove bottom of the groove 321, and the groove walls on both sides of the groove 321 are located between one side of the notch and the processing surface 11 to form a barb 3212. The inner corner 3211 is formed by the bottom surface of the groove 321 and the side groove wall, and the barb portion 3212 is formed by the side groove wall and the processing surface 11.

[0054] The CNC equipment is a CNC numerical control machine tool. The product is placed in a special fixture and fixed tightly. The CNC numerical control machine tool is controlled by a numerical control program to process the processing area corresponding to the plastic part structure. According to different structures, corresponding special cutting tools are selected to process the hook groove structure 32.

[0055] In step S2, when the plastic material is buckled on the plate 1 using the mold and the liquid plastic material is injected therein, the plastic material gradually fills the groove 321 and convexly fills until the injection molded part 2 is formed. The formed injection molded part 2 abuts against the processing surface 11 and has a third joint part 23 adapted to the groove 321 and joined in the groove 321 by mortise and tenon. The inner corner 3211 allows the plastic material to be filled inside it during injection molding, and after molding, the injection molded part 2 is restricted by the barb part 3212 so that it is firmly fixed on the plate 1.

[0056] Specifically, after heating and drying ordinary injection molding raw materials (no need to limit the raw materials and no need for adhesives), they are sucked into the injection molding machine for injection molding. After the product processed in step S1 is cleaned, the product is placed in the injection molding mold according to the positioning direction on the mold. The injection molding machine uses strong pressure to inject and extrude the melted injection molding raw materials into the required specific structure and integrate them with the groove 321 to form the injection molding part 2. The injection molding part 2 and the plate 1 are connected by a barb to produce a product in which the metal shell of the notebook is connected to the plastic structure (plastic).

[0057] Please refer to Figures 11 to 14 In the third embodiment, step S1 still includes the following sub-steps:

[0058] S12, the sheet 1 is stamped and formed. When the processing area is the portion of the sheet 1 located within the edge and corner of the processing surface 11, it is defined as the second processing area 122. The plastic structure includes a hook groove structure 32 formed on the second processing area 122 using CNC equipment.

[0059] In step S12 of the third embodiment, the injection molding part 2 that needs to be formed on some metal shells needs to penetrate the plate 1. In this case, a second processing area 122 is also formed on the plate 1. Compared with the second embodiment, the third embodiment uses CNC equipment to open multiple hook groove structures 32 at intervals on the second processing area 122, so that the injection molding part 2 can be connected to the plate 1 at multiple points locally after molding, and it can also be firmly connected to the plate 1 while ensuring the design requirements. The hook groove structure 32 can be opened in a circular shape or in other shapes. The hook groove structure 32 is also a groove 321 opened at a selected point in the second processing area 122 of the processing surface 11. The difference from the second embodiment is that the groove 321 is connected to the back side surface 13 away from the processing surface 11 to penetrate the plate 1. Among them, the groove 321 is also formed with an inner corner 3211 and a barb 3212. The side groove wall is processed with a first arm segment 3213 on the side close to the processing surface 11 and a second arm segment 3214 on the side away from the processing surface 11 from the first arm segment 3213. The two second arm segments 3214 are inclined away from the processing surface 11 in opposite directions. The inner corner 3211 is formed by the side surface of the plate 1 facing away from the processing surface 11 and the second arm segment 3214. The hook portion 3212 is formed by the first arm segment 3213, the second arm segment 3214 and the processing surface 11.

[0060] In step S2, the injection molding part 2 is adapted to fill the groove 321 to form the third joint part 23 so as to be connected with the groove 321 by mortise and tenon joints. Thus, compared with the second embodiment, the groove 321 with multiple discontinuous distribution increases the notch size of the groove 321 when the groove 321 passes through the plate 1, avoiding the formation of sharp barbs 3212 and reducing the strength of the third joint part 23 and the diameter of the injection molding part 2 after molding. It should be noted that the injection molding process of this embodiment is consistent with that of the second embodiment, and will not be described in detail here.

[0061] In step S3 of any embodiment of the present invention, robot-assisted feeding is used to place the formed blank into a grinding machine to grind away defects and scraps on the surface of the product, thereby obtaining qualified appearance requirements; after grinding, a robot-assisted feeding device is used to place the product into a special sandblasting machine, and the product surface is sandblasted using traditional sandblasting methods to improve product friction and aesthetics; the combined metal shell is placed in a traditional anodizing tank, and through the joint reaction of electrolysis and chemical agents in the tank, various exquisite colors are attached to the surface of the product; the combined shell is sent to the assembly workshop, the remaining accessories are assembled, and after testing, disinfection, sterilization, separation and packaging and other process treatments, an exquisite finished laptop metal shell is obtained.

[0062] The metal housing for electronic equipment of the present invention may be a metal part of electronic equipment such as a tablet computer back panel or a notebook computer metal housing. The metal housing for electronic equipment includes a plastic structure as described in any of the above embodiments.

[0063] Compared with the prior art, the metal shell forming process and the metal shell for electronic equipment of the present invention are

[0064] (I) From the perspective of basic materials science, metal alloys and plastics belong to two completely different ranges of materials, one is a metal material and the other is a non-metal material. If the traditional processing method is to combine the two, extraordinary means must be used, such as using glue, T treatment and other special processes. By adding a plastic structure to combine it with the injection molding part 2 using a mortise and tenon structure, the injection molding part 2 and the plate 1 no longer use the T treatment process during processing, and the injection molding part 2 and the metal plate 1 are tightly connected;

[0065] (ii) The new process eliminates the processes of T-treatment, dispensing, hot pressing, etc., greatly improving the output efficiency; while the T-treatment process limits the material used in the injection molding part 2, the structure of this embodiment makes it no longer limited, achieving product diversification and economy, and is more environmentally friendly than the traditional process, while also saving costs;

[0066] (iii) T treatment is a special process with high manufacturing cost and low output yield. Compared with the high cost and yield of T treatment, the process of the present invention eliminates and reduces the number of process flows, thereby improving product efficiency;

[0067] (iv) After the T treatment process, the plastic raw materials used are limited. Currently, the plastic raw materials known in the industry can only react with a few types of raw materials such as PBT, PPS, and nylon. The present invention is not limited by materials, which improves the diversification and economy of the products. During the T treatment, a rapid cooling and rapid heating system is required to heat and cool the mold during injection molding, which consumes a lot of electricity and tap water. The present invention does not require a large amount of electricity and tap water, which greatly reduces energy consumption.

Claims

1. A metal shell forming process, characterized in that: The following steps are involved: S1. According to the needs of the product, a processing shape is designed to form a plate, the plate has a processing surface, a processing area is formed on the processing surface corresponding to the plastic part structure to be formed, and finally a plastic structure is formed on the processing area; S2, using the selected plastic material to combine it with the plastic structure by using an injection molding machine until the plastic material is formed into an injection molded part, thereby forming a molded blank; S3, grinding, sandblasting and anodizing the formed blank in sequence.

2. The metal shell forming process according to claim 1, characterized in that: The S1 step includes the following sub-steps: S11. When the plate is stamped and formed, the processing area is defined as a first processing area when the processing area is a local edge portion at the edge or corner of the processing surface on the plate, and the plastic structure includes a barb structure formed on the first processing area when the plate is stamped and formed.

3. The metal shell forming process according to claim 2, characterized in that: In the S11 step: the side of the plate facing away from the processing surface is defined as the back side surface, and the barb structure formed after the plate is stamped and formed includes a barb portion extending from the first processing area toward the side away from the back side surface, and the barb portion is inclined inward relative to the plate along the horizontal distribution direction of the plate, and the barb structure also includes a coupling groove recessed at the first processing area of ​​the back side surface corresponding to the barb portion, and the coupling groove is open outward relative to the plate along the horizontal distribution direction of the plate.

4. The metal shell forming process according to claim 3, characterized in that: In the S2 step: after injection molding, the injection molded part is combined with the position of the barb structure to form a first combining part wrapped on the outer edge of the barb part and the first processing area, and a second combining part filled in the combining groove, and the second combining part is flush with the back side surface to make the injection molded part and the barb structure mortise and tenon combined.

5. The metal shell forming process according to claim 1, characterized in that: The S1 step includes the following sub-steps: S12, the sheet is stamped and formed, and when the processing area is a portion of the sheet located within the edge or corner of the processing surface, it is defined as a second processing area, and the plastic structure includes a hook groove structure formed by CNC equipment on the second processing area.

6. The metal shell forming process according to claim 5, characterized in that: In the step S12: a groove is machined on the second machining area using CNC equipment, and the groove walls on both sides of the groove are tilted away from the machining surface so that the bottom of the groove is widened relative to the groove opening and inner angles are formed on both sides of the bottom of the groove, so that the groove walls on both sides of the groove are located between one side of the groove opening and the machining surface to form a barb portion.

7. The metal shell forming process according to claim 6, characterized in that: In the step S12: the inner corner is formed by the groove bottom surface and the side groove wall, and the barb portion is formed by the side groove wall and the processed surface.

8. The metal shell forming process according to claim 6, characterized in that: In the step S12: the groove is connected to the plate toward the side away from the processing surface, the side groove wall is processed with a first arm segment on the side close to the processing surface and a second arm segment on the side away from the processing surface from the first arm segment, the second arm segments are inclined away from the processing surface on the side, the inner angle is formed by the side of the plate facing away from the processing surface and the second arm segment, and the hook portion is formed by the first arm segment, the second arm segment and the processing surface.

9. The metal shell forming process according to claim 7 or 8, characterized in that: In the step S2: after injection molding, the injection molded part is molded at the position of the hook groove structure to have a third joint part filled in the groove to be combined with the hook groove by mortise and tenon joints.

10. A metal casing for electronic equipment, characterized in that: It comprises the plastic structure as described in any one of claims 1 to 8.

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