Processing method of back shell for tablet personal computer

Abstract

The invention relates to the technical field of metal processing, and discloses a method for processing a back shell for a tablet personal computer, comprising the following steps: S1, providing a plate; s2, an inner groove is machined in the first side face of the plate, and a plurality of injection molding grooves are machined in the first side face and the second side face correspondingly; s3, plastic liquid is injected into the injection molding grooves, so that plastic structures are formed in the injection molding grooves; and S4, a back plate, side plates, inner side faces and hole structures are machined in the plate. The shapes of the plastic structures are sequentially machined, then the plastic structures are filled into the injection molding grooves in an injection molding mode, preliminary machining of the plastic structures is completed, then plates and the plastic structures are machined through CNC equipment, finally, hole structures are machined, and machining of the back shell of a complex structure is completed in an ordered mode. And the processing difficulty is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of metal processing, and in particular to a method for processing a back shell for a tablet computer. Background Art

[0002] The tablet back cover is an important part of the tablet. It not only provides a firm protection for the tablet, but also gives the tablet a unique appearance and texture. The metal back cover can withstand greater external pressure in the tablet, effectively protecting the delicate components inside the tablet from damage. The metal material has good heat dissipation performance, which helps the camera maintain a stable temperature during long-term use and avoids performance degradation caused by overheating.

[0003] As people pursue personalization, the designs of tablet computers are diverse. As a result, the structure of the back shell has become increasingly complex, and the appearance processing has become more and more difficult. How to process the back shell reasonably and accurately has become a problem. 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 method for processing a back shell for a tablet computer to solve the problem of processing the back shell for a tablet computer.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is: providing a method for processing a back cover for a tablet computer, comprising the following steps:

[0006] S1. Provide a plate, wherein the plate comprises a first side surface and a second side surface that are oppositely distributed along a thickness direction of the plate, and the plate further comprises two short sides that are oppositely distributed along a length direction of the plate and two long sides that are oppositely distributed along a width direction of the plate;

[0007] S2, processing an inner groove on the first side surface of the plate, and processing a plurality of injection molding grooves on the first side surface and the second side surface respectively;

[0008] S3, injecting plastic liquid into each injection molding groove to form a plastic structure in the injection molding groove;

[0009] S4. Processing the back panel, side panels, inner side panels and various hole structures on the plate.

[0010] Furthermore, the step S2 includes the following sub-steps:

[0011] S21, processing an inner groove recessed relative to the first side surface from the middle position of the first side surface along the thickness direction of the plate, wherein the depth of the inner groove is greater than the depth of the inner side surface of the back shell;

[0012] S22, processing a first injection molding groove recessed relative to the first side surface along the thickness direction of the plate on the first side surface, the first injection molding groove is provided in two portions and arranged outside the inner groove on both sides along the length direction of the plate, and processing areas are reserved between the inner groove and the two long sides and the two first injection molding grooves;

[0013] S23, processing a plurality of second injection molding grooves and a plurality of third injection molding grooves recessed relative to the first side surface on the processing area along the thickness direction of the plate, wherein the second injection molding grooves penetrate the plate along the thickness direction of the plate;

[0014] S24, fourth injection molding grooves are respectively processed on the second side surface at positions opposite to the two first injection molding grooves along the thickness direction, and the two fourth injection molding grooves are respectively connected to the two first injection molding grooves along the thickness direction.

[0015] Furthermore, the step S22 includes the following sub-steps:

[0016] S221, processing two first groove walls spaced apart along the width direction of the plate from the first side surface, processing a bottom groove wall close to the second side surface along the thickness direction of the plate toward the second side surface, and processing second groove walls and third groove walls spaced apart and distributed along the length direction of the plate, so that the first groove wall, the second groove wall, the third groove wall and the bottom groove wall are arranged to form a first injection groove, and the second groove wall is located close to one side of the inner groove, and the spacing between the two second groove walls is adapted to the width of the inner side surface of the back shell, so that the spacing between the two third groove walls of the two first injection grooves is adapted to the length of the inner side surface;

[0017] S222. A protruding first protrusion, a second protrusion and a plurality of recessed first hanging grooves are processed on the first groove wall and the third groove wall, a plurality of hanging gaps are processed on the first protrusion, and a recessed second hanging groove is processed on the bottom groove wall.

[0018] Furthermore, in the step S23: a third injection molding groove is processed near one of the long sides of the plate and located in the middle thereof to be defined as the third injection molding groove, and a through hole connecting the third injection molding groove is processed from the long side along the width direction of the plate.

[0019] Furthermore, in the step S24: two ends of the fourth injection groove are respectively opened and penetrated to the two first groove walls.

[0020] Furthermore, in the step S3: plastic liquid is respectively filled into each of the first injection molding groove, the second injection molding groove, the third injection molding groove and the fourth injection molding groove, and a plastic structure is formed after cooling.

[0021] Furthermore, the S4 step includes the following sub-steps:

[0022] S41, processing a first plate surface from the second side surface, processing two first outer sides adapted to the long side plates of the back shell and two second outer sides adapted to the short side plates of the back shell along the thickness direction of the outer periphery of the first plate surface, and after processing, the two ends of the plastic structure in the fourth injection molding groove are located on the two first outer sides to form a partition strip;

[0023] S42, thinning the processing area and the plastic structure along the thickness direction from the second side surface, so that the processing area corresponds to the inner groove to form a second plate surface, and two first inner side edges adapted to the long side plate of the back shell and two second inner side edges adapted to the short side plate of the back plate are respectively formed on the outer periphery of the second plate surface, the second plate surface and the first plate surface form a back plate, the first outer side edge and the second inner side edge form a long side plate, the second outer side edge and the second inner side edge form a short side plate, and the second plate surface, the first inner side edge and the second inner side edge form an inner side surface;

[0024] S43, processing hole structures on the long side and the short side respectively.

[0025] Furthermore, in the step S41: the two first outer edges and the second outer edges are recessed relative to the plate, so that a step edge is formed on the plate.

[0026] Furthermore, in step S42: when processing the first inner side and the second inner side, the plastic structure covering the first protrusion and the second protrusion is retained, and the plastic structure of other parts is thinned to form the first boss and the second boss on the short side panel and the long side panel corresponding to the inner side surface. After the inner side surface is processed, the step edges are removed from each outer side and each inner side along the thickness direction to form a side panel.

[0027] Furthermore, the step S43 includes the following sub-steps:

[0028] S431, processing first functional holes on the second side surface;

[0029] S432, machining second functional holes on the long side plate and the short side plate respectively;

[0030] S433. Open a third functional hole on the inner side surface and the plastic structure.

[0031] The back shell processing method for a tablet computer of the present invention has at least the following beneficial effects: the shape of the plastic structure is processed in sequence, and then the plastic structure is filled into the injection molding groove by injection molding to complete the preliminary processing of the plastic structure, and then the plate and the plastic structure are processed by CNC equipment, and finally the hole structures are processed to complete the back shell processing of the complex structure in an orderly manner, which effectively reduces the processing difficulty; by processing the embryonic shell and the step edge, the side and the back are processed one by one while ensuring the positioning, thereby reducing the damage to the inner cavity structure that may occur during the processing and improving the yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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:

[0033] Figure 1 It is a flow chart of the back shell processing method of the present invention;

[0034] Figure 2 It is a sub-step flow chart of step S2 in the present invention;

[0035] Figure 3 This is a schematic diagram of the structure after processing in step S21 of the present invention;

[0036] Figure 4 It is a schematic diagram of the structure at another angle after processing in step S21 of the present invention;

[0037] Figure 5 It is a sub-step flow chart of step S22 in the present invention;

[0038] Figure 6 This is a schematic diagram of the structure after processing in step S2 of the present invention;

[0039] Figure 7 for Figure 6 An enlarged schematic diagram of part A is shown;

[0040] Figure 8 It is a schematic diagram of the structure at another angle after processing in step S2 of the present invention;

[0041] Fig. 9 This is a schematic diagram of the structure after processing in step S3 of the present invention;

[0042] Fig.10 It is a schematic diagram of the structure at another angle after processing in step S3 of the invention;

[0043] Fig.11 It is a sub-step flow chart of step S4 in the present invention;

[0044] Fig.12 This is a schematic diagram of the structure after processing in step S41 of the present invention;

[0045] Fig.13 This is a schematic diagram of the structure of the processing step S42 in the present invention;

[0046] Fig.14 This is a structural schematic diagram of the second processing of step S42 in the present invention;

[0047] Fig.15 It is a sub-step flow chart of step S43 in the present invention;

[0048] Fig.16 This is a schematic diagram of the structure after processing in step S431 of the present invention;

[0049] Fig.17 This is a schematic diagram of the structure after processing in step S432 of the present invention;

[0050] Fig.18 It is a schematic diagram of the structure at another angle after processing in step S432 of the present invention;

[0051] Fig.19 It is a schematic diagram of the structure after processing in step S433 of the present invention.

[0052] The meanings of the symbols in the accompanying drawings are:

[0053] Back shell 1, back plate 11, side plate 12, long side plate 121, short side plate 122, inner side a, plastic structure 13, first functional hole 14, camera hole 141, decorative slot 142, second functional hole 15, card holder hole 151, power hole 152, volume hole 153, speaker hole 154, USB hole 155, third functional hole 16, positioning column 17, first structural slot 18, second structural slot 19, plate 20, inner slot 21, first positioning hole 22, second positioning hole 23, first injection molding slot 24, first slot wall 241, bottom slot wall 242, second slot wall 243, third slot wall 244, first protrusion 245, second Protrusion 246, first hanging groove 247, hanging gap 248, second hanging groove 249, second injection groove 25, third injection groove 26, third injection groove 261, fourth injection groove 27, end groove 271, perforation 28, first side groove 29, second side groove 30, third side groove 31, step edge 32, partition strip 33, long side edge 34, short side edge 35, third positioning hole 36, first side surface 371, second side surface 372, first outer edge 381, second outer edge 382, ​​first inner edge 383, second inner edge 384, first plate surface 391, second plate surface 392, first boss 401, second boss 402. DETAILED DESCRIPTION

[0054] The present invention will be further described below in conjunction with the accompanying drawings.

[0055] Please refer to Fig.19The illustrated example is the structure of the back shell for a tablet computer (hereinafter referred to as "back shell 1") formed after the processing is completed, including a rectangular back plate 11 and side plates 12 sequentially arranged on the four sides of the back plate 11, the side plates 12 include two long side plates 121 and two short side plates 122, and the connection between the side plates 12 is rounded. The cavity surface where the cavity structure surrounded by the back plate 11 and the side plates 12 is located is defined as the inner side a, and the surface of the back plate 11 and the side surface outside the inner side a are its outer shape. The back plate 11 and the side plates 12 are both made of metal material, and AL6013A material can be selected. The back shell 1 includes a plastic structure 13 located in the inner side a, a first functional hole 14 formed on the back plate 11, a second functional hole 15 formed on the long side plates 121 and the short side plates 122, and a third functional hole 16 formed on the inner side a and on the plastic structure 13. The first functional hole 14 includes a camera hole 141 and a decorative slot 142, and the camera hole 141 and the decorative slot 142 are arranged parallel to the long side plate 121 and on a line. The second functional hole 15 includes a card holder hole 151, a power hole 152, a volume hole 153 and a lanyard hole located on the long side plate 121, and the second functional hole 15 also includes a speaker hole 154 and a USB hole 155 located on the side edge. In order to install the back shell 1, a plurality of positioning posts 17 are protruded in the inner side a along the thickness direction, and the third functional hole 16 includes a plurality of positioning slots that respectively penetrate the positioning posts 17, a first structural slot 18 opened on the plastic structure 13 to adapt to other structures of the tablet computer, and a second structural slot 19 formed on the back plate 11 to adapt to other structures of the tablet computer for easy installation.

[0056] Please refer to Figures 1 to 19 The method for processing the tablet computer back cover 1 of the present invention comprises the following steps:

[0057] S1. Provide a plate 20, wherein the plate 20 comprises a first side surface 371 and a second side surface 372 that are relatively distributed along the thickness direction of the plate 20, and the plate 20 further comprises two short sides 35 that are relatively distributed along the length direction of the plate 20 and two long sides 34 that are relatively distributed along the width direction of the plate 20. In this step, the plate 20 is a rectangular parallelepiped structure and is formed by aluminum extrusion. The plate 20 can be made of AL6063, and the flatness needs to be controlled to be 0.2 mm during aluminum extrusion.

[0058] S2, please refer to Figures 1 to 8 An inner groove 21 is processed on the first side surface 371 of the plate 20 , and a plurality of injection molding grooves are processed on the first side surface 371 and the second side surface 372 , respectively.

[0059] The S2 step includes the following sub-steps:

[0060] S21, please refer to Figure 3 to Figure 4An inner groove 21 recessed relative to the first side surface 371 is processed from the middle position of the first side surface 371 along the thickness direction of the plate 20 , and the depth of the inner groove 21 is greater than the depth of the inner side surface a of the back shell 1 .

[0061] In this step, in order to facilitate the processing of the back shell 1, the overall thickness of the plate 20 is greater than the overall thickness of the back shell 1. For this reason, the depth of the inner groove 21 is opened to a depth greater than the depth of the inner side a, which is conducive to the processing of the redundant parts during the subsequent injection molding, so that when there are relatively minor problems in the processing, the structure can be modified to a certain extent through processing. Two first positioning holes 22 that are diagonally distributed and penetrate the plate 20 in the thickness direction and second positioning holes 23 that are diagonally distributed and penetrate the plate 20 in the thickness direction are opened on the plate 20. A plurality of side grooves are opened on each side of the plate 20. The first positioning holes 22 and each side groove are defined as positioning structures, and the first positioning holes 22 and the second positioning holes 23 are distributed on each side close to the plate 20. An area where the back shell 1 can be processed is reserved between each first positioning hole 22 and the second positioning hole 23, so that the plate 20 can be fixed during processing and does not hinder the processing of the back shell 1.

[0062] In this step, when the first positioning hole 22 and the second positioning hole 23 are opened, the plate 20 is clamped in the width direction and the length direction from the side of the plate 20 by the clamping device. After the two first positioning holes 22 are opened, the position of the plate 20 is fixed by the first positioning holes 22 to position and prevent fooling. Subsequently, the plate 20 is fixed by the first positioning holes 22 through the clamping device so that each side of the plate 20 is exposed, and a first side groove 29 is recessed along the width direction on one of the long sides 34 of the plate 20, and a second side groove 30 is provided in a stepped manner on the edge position of the first side 371 close to the other side edges. The first side groove 29 penetrates the plate 20 in the thickness direction, and the second side groove 30 is recessed from the first side 371, so that the first side grooves 29 and the second side grooves 30 can be quickly aligned when the clamping device is used, and at the same time play a certain fooling-proofing role. Then, the CNC processing equipment is continued to be used to process the inner groove 21 on the first side 371. In this way, the processing is carried out step by step, and the complex structures on the back shell 1 and its inner side a are processed separately to ensure the basic position and reduce the processing difficulty to a certain extent. It should be noted that a three-axis fixture can be used in this step to fix the plate 20.

[0063] S22, please refer to Figure 5 A first injection molding groove 24 recessed relative to the first side surface 371 is machined on the first side surface 371 along the thickness direction of the plate 20. The first injection molding groove 24 is divided into two and is arranged outside the inner groove 21 on both sides along the length direction of the plate 20. Processing areas are reserved between the inner groove 21 and the two long sides 34 and the two first injection molding grooves 24.

[0064] The processing uses CNC processing equipment, and uses a three-axis fixture to position and fix the plate 20 with the first positioning hole 22, and the first side 371 of the plate 20 faces upward, and the second side 372 faces the fixture and is distributed downward. In this step, the two first injection grooves 24 are processed to have the contour shape of the plastic structure 13 and the groove depth is deepened, and the groove wall of the first injection groove 24 is adapted to the outer contour of the plastic structure 13.

[0065] Please refer to Figures 5 to 8 , the step S22 includes the following sub-steps:

[0066] S221. Two first groove walls 241 spaced apart along the width direction of the plate 20 are processed from the first side surface 371, a bottom groove wall 242 close to the second side surface 372 along the thickness direction of the plate 20 is processed toward the second side surface 372, and second groove walls 243 and third groove walls 244 spaced apart and distributed along the length direction of the plate 20 are processed, so that the first groove wall 241, the second groove wall 243, the third groove wall 244 and the bottom groove wall 242 are arranged to form a first injection groove 24, and the second groove wall 243 is located on the side close to the inner groove 21, and the distance between the two second groove walls 243 is adapted to the width of the inner side surface a of the back shell 1, so that the distance between the two third groove walls 244 of the two first injection grooves 24 is adapted to the length of the inner side surface a.

[0067] In this step, the first injection molding groove 24 is formed by hollowing out the corresponding position of the plate 20 along the thickness direction, and processing the first groove wall 241, the second groove wall 243, the third groove wall 244 and the bottom groove wall 242 one by one. Among them, the first groove wall 241 is processed and opened corresponding to the position a of the inner side surface where the long side plate 121 of the back shell 1 is located, so that the two first groove walls 241 serve as a part of the long side plate 121 after the subsequent processing is completed. The third groove wall 244 is processed and opened corresponding to the position a of the inner side surface where the short side plate 122 of the back shell 1 is located, and the two ends of the third groove wall 244 are respectively processed onto the two first groove walls 241, so that the two third groove walls 244 serve as a part of the short side plate 122 after the subsequent processing is completed. The second groove wall 243 is only processed to form an injection molding cavity during subsequent injection molding, and for this reason, the second groove wall 243 is smooth and flat.

[0068] S222, a protruding first protrusion 245, a second protrusion 246 and a plurality of recessed first hanging grooves 247 are processed on the first groove wall 241 and the third groove wall 244, a plurality of hanging gaps 248 are processed on the first protrusion 245, and a recessed second hanging groove 249 is processed on the bottom groove wall 242.

[0069] In this step, since the area of ​​the first injection molding groove 24 is relatively large, and the processing of the first injection molding groove 24 is mainly used for subsequent injection molding, for this reason, the first protrusion 245, the second protrusion 246 and the first hanging groove 247 are formed on the first groove wall 241 and the second groove wall 243, so that the part that is easy to be injected after injection molding can stay on the first groove wall 241 and the third groove wall 244 more stably during demolding. Similarly, the second hanging groove 249 on the bottom groove wall 242 has the same function. Among them, the first protrusion 245 and the second protrusion 246 not only ensure the stability of the array part, but also are used to form a protruding structure after subsequent injection molding to correspond to the formation of the inner side a and the short side plate 122. The specific protruding position and structure are adapted to the inner side a of the short side plate 122. See for details. Figure 6 and Figure 7 .

[0070] S23, a plurality of second injection grooves 25 and a plurality of third injection grooves 26 recessed relative to the first side surface 371 are processed in the processing area along the thickness direction of the plate 20, wherein the second injection grooves 25 penetrate the plate 20 along the thickness direction of the plate 20.

[0071] In the step S23, the second injection molding groove 25 penetrates the plate 20 along the thickness direction and is set to two and both are rectangular parallelepiped structures. The two second injection molding grooves 25 are spaced apart along the length direction and are located on a line. The position of one second injection molding groove 25 corresponds to the position of the camera hole 141 of the back shell 1 and is smaller than the other second injection molding groove 25. The larger second injection molding groove 25 is used as a subsequent decorative groove. In this step, a third side groove 31 is added. The processing method of the third side groove 31 is similar to that of the second side groove 30. Both are processed on the long side 34 and the short side 35 along the thickness direction, and the groove depth is greater than the groove depth of the second side groove 30.

[0072] In this step, one of the third injection molding grooves 26 is processed near one of the long sides 34 of the plate 20 and is located in the middle position to be defined as the third injection molding groove 261. The third injection molding groove 261 and the two second injection molding grooves 25 are arranged on both sides of the inner groove 21. A through hole 28 connecting the third injection molding groove 261 is processed from the long side 34 along the width direction of the plate 20, and three through holes 28 are processed along the length direction of the plate 20.

[0073] S24. Fourth injection grooves 27 are respectively processed on the second side surface 372 at positions opposite to the two first injection grooves 24 along the thickness direction. The two fourth injection grooves 27 are respectively connected to the two first injection grooves 24 along the thickness direction.

[0074] In the step S24: a clamp device is used to fix the plate 20 with the two second positioning holes 23, so that the second side 372 faces upward and the first side 371 faces downward, the two fourth injection grooves 27 are respectively opposite to the two first injection grooves 24 along the thickness direction, and the two fourth injection grooves 27 respectively penetrate the bottom groove walls 242 of the two first injection grooves 24 along the thickness direction to connect the two first injection grooves 24 respectively, so that the plastic liquid can be poured into the fourth injection groove 27 from the first side 371 during injection. The two ends of the fourth injection molding groove 27 are respectively opened and penetrated to the two first groove walls 241, and the two ends of the fourth injection molding groove 27 are bent in accordance with the first groove wall 241 and are parallel to the first groove wall 241, and the two ends of the fourth injection molding groove 27 are further opened along the length direction of the plate 20 to form an end groove 271, and the end groove 271 intersects the first groove wall 241, so that when the long side plate 121 is processed after injection molding, it can be processed to the end groove 271, so that the injection molding part can separate the back plate 11 part and the long side plate 121 part. After the processing of each injection molding groove and perforation 28 is completed, step S2 is completed, and the processed plate 20 is polished and fully inspected to remove burrs, and then chemical sandblasting and T treatment are performed in sequence to ensure the quality of the surface of the plate 20.

[0075] S3, please refer to Figures 9 and 10 , inject plastic liquid into each injection molding groove to form a plastic structure 13 in the injection molding groove.

[0076] In step S3: plastic liquid is filled into each first injection molding groove 24, second injection molding groove 25, third injection molding groove 26 and fourth injection molding groove 27 respectively, and a plastic structure 13 is formed after cooling. In which, an injection molding machine is used, and then the plate 20 is installed in the mold, and the flatness is controlled to be 0.2mm, so that three flow channels are formed between the first side 371 and the mold, wherein the first flow channel is connected from the outside to the inside to the third injection molding groove 261 with a perforation 28, the second flow channel is connected from the outside to the inside to one of the first injection molding grooves 24 and the fourth injection molding groove 27, and the third flow channel is connected from the outside to the inside to another first injection molding groove 24, the second injection molding groove 25 and the other third injection molding groove 26, so that the formation of the plastic structure 13 can be ensured and the possibility of the loss of the plastic structure 13 can be reduced. Plastic liquid is filled into each first injection molding groove 24, the second injection molding groove 25, the third injection molding groove 26 and the fourth injection molding groove 27 respectively through three flow channels, and a plastic structure 13 with residual material is formed after cooling. A test piece is provided on each injection molding groove to test the bonding force between the plastic structure 13 and the plate 20. The structure of each plastic groove wall can also ensure a certain bonding force. A full inspection is performed after injection molding to select unqualified products. Among them, the plastic structure 13 completely fills the fourth injection molding groove 27, and the first injection molding groove 24, the second injection molding groove 25 and the third injection molding groove 26 are all covered with plastic on one side to form the plastic structure 13, which is not completely filled, and there is no plastic structure 13 on the corresponding second groove wall 243.

[0077] S4, please refer to Figures 11 to 19 The back plate 11 , the side plate 12 , the inner side surface a and the USB holes 155 are processed on the plate 20 .

[0078] The S4 step includes the following sub-steps:

[0079] S41, please refer to Fig.12 A first plate surface 391 is processed from the second side surface 372, and two first outer edges 381 adapted to the long side plate 121 of the back shell 1 and two second outer edges 382 adapted to the short side plate 122 of the back shell 1 are respectively processed along the thickness direction on the outer periphery of the first plate surface 391. After processing, the two ends of the plastic structure 13 in the fourth injection molding groove are located on the two first outer edges 381 to form a partition belt 33.

[0080] In the step S41: the plate 20 is fixed by the second positioning hole 23 through the clamping device, so that the second side 372 faces upward and the first side 371 faces downward, and the control plane is 0.3mm. The first outer edge 381 intersects with the plastic structure 13 in the end groove 271 along the length direction of the plate 20 to form the partition strip 33. The back shell 1 and the side panel 12 of part of the back shell 1 are initially formed by processing from the second side 372 corresponding to the size of the back shell 1, and the injection molding part outside the fourth injection molding groove 27 is removed, and the plastic structure 13 in the fourth injection molding groove 27 and the first injection molding groove 24 partitions the plate 20 along the width direction. The partition strip 33 can keep the metal material isolated by the plastic structure 13 after the final molding, so as to ensure the signal transmission inside and outside the back shell 1. The two first outer edges 381 and the second outer edges 382 are recessed relative to the second side surface 372 of the plate 20 so that a step edge 32 is formed on the plate 20. The first positioning hole 22 and the second positioning hole 23 are both located on the step edge 32. At this time, the step edge 32 is retained to facilitate fixing the plate 20.

[0081] S42, please refer to Fig.13 and Fig.14 , the processing area and the plastic structure 13 are thinned along the thickness direction from the second side surface 372, so that the processing area corresponds to the inner groove 21 to form a second plate surface 392, and two first inner sides 383 adapted to the long side plate 121 of the back shell 1 and two second inner sides 384 adapted to the short side plate 122 of the back plate 11 are respectively formed on the outer periphery of the second plate surface 392, the second plate surface 392 and the first plate surface 391 form the back plate 11, the first outer side edge 381 and the second inner side edge 384 form the long side plate 121, the second outer side edge 382 and the second inner side edge 384 form the short side plate 122, and the second plate surface 392, the first inner side edge 383 and the second inner side edge 384 form the inner side a.

[0082] In step S42: use a fixture to fix the plate 20 with the first positioning hole 22 or the second positioning hole 23 as a positioning point, and make the first side 371 face upward and the second side 372 face downward, and control the flatness to be 0.5 mm. The first side 371 and the redundant plastic structure 13 are processed based on a bottom groove surface of the inner groove 21 close to the second side 372. When processing the first inner side edge 383 and the second inner side edge 384, the plastic structure 13 covering the first protrusion 245 and the second protrusion 246 is retained, and the plastic structure 13 of the other parts is thinned to form the first boss 401 and the second boss 402 on the short side plate 122 and the long side plate 121 corresponding to the inner side a. After the inner side a is processed, the step edge 32 is removed from each outer side edge and each inner side edge along the thickness direction to form the side plate 12. Among them, the first boss 401 corresponds to the first protrusion 245, and the second boss 402 corresponds to the second protrusion 246.

[0083] In this step, the processing area is thinned, and the material is reduced based on the inner groove 21 until the processing area is basically flush with the groove wall of the inner groove 21 close to the second side 372, and the processing of the inner side a is completed. After the inner side a is formed, the inner groove 21 is flush with the cavity wall of the inner side a. Two secondary positioning columns 17 are processed in the inner side a, and the two positioning columns 17 are respectively arranged at the diagonal positions. The positioning columns 17 are penetrated in the thickness direction on the two positioning columns 17 to process the third positioning hole 36, and the third positioning hole 36 does not penetrate the young shell. After the processing of the inner side a is completed, the back plate 11 and the side plate 12 of the back shell 1 are basically formed and defined as a young shell. The young shell is cleaned and polished to remove burrs, and then the young shell is polished with coarse cloth, and then cleaned and fully inspected, and then the processing is continued. The young shell is fixed with two third positioning holes 36 using a fixture, and the first side 371 is facing downward and the second side 372 is facing upward, and the flatness is controlled to be 0.6mm. Then, CNC processing equipment is used to remove the step edge 32 from the side of the juvenile shell in the thickness direction, thereby forming a long side plate 121 and a short side plate 122. After the processing is completed, cleaning and full inspection are carried out.

[0084] S43, please refer to Figures 15 to 19 , hole structures are processed on the long side 34 and the short side 35 respectively.

[0085] The step S43 includes the following sub-steps:

[0086] S431 , processing each first functional hole 14 on the second side surface 372 .

[0087] In the step S431, the first functional hole 14 is processed in the plastic structure 13 corresponding to the second injection molding groove 25 to form the camera hole 141 and the decorative part groove 142. It is easier to process on plastic. After the processing is completed, it is necessary to laser engrave the LOGO, use a robot to fine-grind it, clean and inspect it, sandblast it, anodize it once, inspect it, and apply a film on the surface. After fixing the back panel 11 through the third positioning hole 36, make the first side 371 face down and the second side 372 face up. The side is finely processed to form the final side panel 12.

[0088] S432 , processing the second functional holes 15 on the long side plate 121 and the short side plate 122 respectively.

[0089] In step S432, the back plate 11 is fixed with the third positioning hole 36, so that the first side surface 371 faces downward and the second side surface 372 faces upward. The second functional holes 15 include the processed card holder hole 151, power hole 152, volume hole 153 and lanyard hole opened on the long side 34, and the speaker hole 154 and USB hole 155 formed on the short side 35. After the second functional holes 15 are processed, secondary anodization, cleaning, full inspection and film application are performed.

[0090] S433 , processing a third functional hole 16 on the inner side surface a and the plastic structure 13 .

[0091] In step S433, the back plate 11 is fixed with the third positioning hole 36, so that the second side 372 faces downward and the first side 371 faces upward. The third functional hole 16 includes slots on each positioning column 17, slots on each plastic structure 13, and slots or holes on the inner side a cavity wall, including fine processing of the speaker hole 154 and the USB hole 155, etc. After completion, the entire back shell 1 is processed. After that, the grinding and full inspection are carried out to remove burrs, and then the conductive bits are laser engraved, and the other parts of the tablet computer structure are assembled to the back shell 1, and then the full inspection is packaged and shipped.

[0092] According to the above manufacturing method, CNC processing equipment is first used for roughing, and then injection molding is performed to form a basic plastic structure 13, and finally the back panel 11, the side panel 12, the inner side surface a and the hole structure are processed to ensure that each structure is processed during processing, and to avoid the plastic structure 13 blocking the hole structures and affecting the final molding and product quality; processing the hole structures after the inner side surface a, the back panel 11 and the side panel 12 are formed can make processing faster and easier.

Claims

1. A method for processing a back cover for a tablet computer, characterized in that: The following steps are involved: S1. Provide a plate, wherein the plate comprises a first side surface and a second side surface that are oppositely distributed along a thickness direction of the plate, and the plate further comprises two short sides that are oppositely distributed along a length direction of the plate and two long sides that are oppositely distributed along a width direction of the plate; S2, processing an inner groove on the first side surface of the plate, and processing a plurality of injection molding grooves on the first side surface and the second side surface respectively; S3, injecting plastic liquid into each injection molding groove to form a plastic structure in the injection molding groove; S4. Processing the back panel, side panels, inner side panels and various hole structures on the plate.

2. The method for processing a back cover for a tablet computer according to claim 1, wherein: The S2 step includes the following sub-steps: S21, processing an inner groove recessed relative to the first side surface from the middle position of the first side surface along the thickness direction of the plate, wherein the depth of the inner groove is greater than the depth of the inner side surface of the back shell; S22, processing a first injection molding groove recessed relative to the first side surface along the thickness direction of the plate on the first side surface, the first injection molding groove is provided in two portions and arranged outside the inner groove on both sides along the length direction of the plate, and processing areas are reserved between the inner groove and the two long sides and the two first injection molding grooves; S23, processing a plurality of second injection molding grooves and a plurality of third injection molding grooves recessed relative to the first side surface on the processing area along the thickness direction of the plate, wherein the second injection molding grooves penetrate the plate along the thickness direction of the plate; S24, fourth injection molding grooves are respectively processed on the second side surface at positions opposite to the two first injection molding grooves along the thickness direction, and the two fourth injection molding grooves are respectively connected to the two first injection molding grooves along the thickness direction.

3. The method for processing a tablet computer back cover according to claim 2, wherein: The step S22 includes the following sub-steps: S221, processing two first groove walls spaced apart along the width direction of the plate from the first side surface, processing a bottom groove wall close to the second side surface along the thickness direction of the plate toward the second side surface, and processing second groove walls and third groove walls spaced apart and distributed along the length direction of the plate, so that the first groove wall, the second groove wall, the third groove wall and the bottom groove wall are arranged to form a first injection groove, and the second groove wall is located close to one side of the inner groove, and the spacing between the two second groove walls is adapted to the width of the inner side surface of the back shell, so that the spacing between the two third groove walls of the two first injection grooves is adapted to the length of the inner side surface; S222. A protruding first protrusion, a second protrusion and a plurality of recessed first hanging grooves are processed on the first groove wall and the third groove wall, a plurality of hanging gaps are processed on the first protrusion, and a recessed second hanging groove is processed on the bottom groove wall.

4. The method for processing a tablet computer back cover according to claim 3, wherein: In the step S23: a third injection molding groove is processed near one of the long sides of the plate and located in the middle thereof to be defined as the third injection molding groove, and a through hole connecting the third injection molding groove is processed from the long side along the width direction of the plate.

5. The method for processing a tablet computer back cover according to claim 4, characterized in that: In the step S24: two ends of the fourth injection groove are respectively opened and penetrated to the two first groove walls.

6. The method for processing a tablet computer back cover according to claim 5, characterized in that: In the step S3: plastic liquid is respectively filled into each of the first injection molding groove, the second injection molding groove, the third injection molding groove and the fourth injection molding groove, and a plastic structure is formed after cooling.

7. The method for processing a tablet computer back cover according to claim 2, wherein: The S4 step includes the following sub-steps: S41, processing a first plate surface from the second side surface, processing two first outer sides adapted to the long side plates of the back shell and two second outer sides adapted to the short side plates of the back shell along the thickness direction of the outer periphery of the first plate surface, and after processing, the two ends of the plastic structure in the fourth injection molding groove are located on the two first outer sides to form a partition strip; S42, thinning the processing area and the plastic structure along the thickness direction from the second side surface, so that the processing area corresponds to the inner groove to form a second plate surface, and two first inner side edges adapted to the long side plate of the back shell and two second inner side edges adapted to the short side plate of the back plate are respectively formed on the outer periphery of the second plate surface, the second plate surface and the first plate surface form a back plate, the first outer side edge and the second inner side edge form a long side plate, the second outer side edge and the second inner side edge form a short side plate, and the second plate surface, the first inner side edge and the second inner side edge form an inner side surface; S43, processing hole structures on the long side and the short side respectively.

8. The method for processing a tablet computer back cover according to claim 7, wherein: In the step S41: the two first outer sides and the second outer sides are recessed relative to the plate, so that a step edge is formed on the plate.

9. The method for processing a tablet computer back cover according to claim 7, wherein: In step S42: when processing the first inner side and the second inner side, the plastic structure covering the first protrusion and the second protrusion is retained, and the plastic structure of other parts is thinned to form the first boss and the second boss on the short side plate and the long side plate corresponding to the inner side surface. After the inner side surface is processed, the step edges are removed from each outer side and each inner side along the thickness direction to form a side panel.

10. The method for processing a tablet computer back cover according to claim 7, wherein: The step S43 includes the following sub-steps: S431, processing first functional holes on the second side surface; S432, machining second functional holes on the long side plate and the short side plate respectively; S433, a third functional hole is processed on the inner side surface and the plastic structure.

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