Folding machine middle frame processing method

Abstract

This invention relates to the field of metal processing technology and discloses a method for processing the middle frame of a folding machine. The processing of the lower middle frame includes the following steps: A1, providing a sheet metal; A2, processing a third forming area and a fourth forming area in both the third and fourth processing areas, with a lower injection groove provided in the third forming area; A3, injecting molten plastic into each lower injection groove to form a lower plastic structure; A4, processing a lower back plate, a lower pivot groove, and a lower inner side surface, and disconnecting the connecting material area to form two second forming blanks; A5, processing a lower side plate and various lower hole structures to form the lower middle frame. By symmetrically forming the third and fourth processing areas, two lower middle frames can be formed after processing, which speeds up the processing efficiency to a certain extent. By sequentially slotting to gradually process the third and fourth forming areas, the lower middle frame is processed in a thinning manner, ensuring a reasonable and orderly processing.

Description

Technical Field

[0001] This invention relates to the field of metal processing technology, and in particular to a method for processing the middle frame of a folding machine. Background Technology

[0002] The frame of foldable electronic products is a crucial component, supporting the screen and internal structure of devices like foldable phones, while also influencing the phone's appearance and durability. It effectively protects the screen from external impacts and scratches, and a carefully crafted finish enhances the phone's aesthetics and user comfort. To ensure high strength and meet the durability requirements of foldable electronic products, the frame is typically made of metal.

[0003] The middle frame consists of an upper middle frame and a lower middle frame, which are connected by a hinge to allow for folding. Since the middle frame needs to house internal components such as batteries during use, its internal structure is complex and varied. Therefore, the key is to manufacture the middle frame structure in an orderly manner. 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 processing the middle frame of a folding machine to solve the problem that the middle frame is not easy to process.

[0005] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: providing a method for processing the middle frame of a folding machine, including processing the lower middle frame, the processing of the lower middle frame including the following steps:

[0006] A1. A sheet material is provided, the sheet material includes a connecting area and a third processing area and a fourth processing area symmetrically distributed on opposite sides of the connecting area along the length of the sheet material, the third processing area and the fourth processing area each include a third side surface and a fourth side surface distributed opposite to each other along the thickness direction of the sheet material.

[0007] A2. A third forming area adapted to one side of the lower back plate of the lower middle frame is processed on the third side of both the third and fourth processing areas, and a fourth forming area adapted to the lower inner side of the lower middle frame is processed on the fourth side. A lower injection groove that penetrates the fourth forming area is provided on the third forming area along the thickness direction of the sheet metal.

[0008] A3. Inject molten plastic into each injection tank to form the lower plastic structure;

[0009] A4. Process the lower back plate and lower pivot groove on the third molding area and the lower plastic structure, and then process the lower inner side on the third molding area and the lower plastic structure to disconnect the connecting material area to form two second molding blanks.

[0010] A5. Machining the lower side plate and each lower hole structure on the second forming blank to form the lower middle frame.

[0011] Furthermore, step A2 includes the following sub-steps:

[0012] A21. A seventh processing groove adapted to the lower back plate and recessed relative to the third side is processed on the third side of both the third processing area and the fourth processing area. The two seventh processing grooves penetrate the connecting material area in opposite directions along the length of the plate to form the third forming area.

[0013] A22. A lower injection groove is processed on the edge of the seventh processing groove, which penetrates the fourth forming area along the thickness direction of the sheet metal. The lower injection groove includes a third injection part processed on the side of the seventh processing groove away from the connecting material area and two fourth injection parts processed on the two sides of the seventh processing groove that are respectively distributed opposite to each other along the width direction of the sheet metal.

[0014] A23. On the fourth side of the third and fourth processing areas, an eighth processing groove is machined along the thickness direction at the position opposite to the seventh processing groove, which is adapted to the lower inner side. A ninth processing groove is machined along the thickness direction from the eighth processing groove to be recessed into the eighth processing groove. A second protrusion is formed inside the eighth processing groove and outside the ninth processing groove. The lower plastic structure passes through the second protrusion to form the fourth molding area.

[0015] Furthermore, in step A22: the two seventh processing grooves are thinned along the thickness direction of the sheet material on the side near the connecting area and on the connecting area, so as to form a stepped groove on the side near the connecting area of ​​the two seventh processing grooves.

[0016] Furthermore, step A4 includes the following sub-steps:

[0017] A41. A rough blank for a shaft groove is machined on the lower step groove to fit the shaft of the folding machine.

[0018] A42. On the third side surface and outside the groove of the seventh processing groove, the lower plastic structure corresponding to the lower middle frame is thinned along the thickness direction of the third side surface and the seventh processing groove to process a first lower side edge surrounding the groove of the seventh processing groove and a second plate surface located inside the first lower side edge and adapted to the lower back plate. The lower plastic structure is a part of the second plate surface and is distributed around the first lower side edge, and a part of the lower plastic structure is located on the first lower side edge.

[0019] A43. On the fourth side and outside the opening of the eighth processing groove, the lower plastic structure corresponding to the lower middle frame is thinned along the thickness direction of the fourth side and the eighth processing groove to process a second lower side that surrounds the opening of the eighth processing groove. The first lower side and the second lower side correspond to each other in the thickness direction of the sheet material, and part of the lower plastic structure is located on the second lower side.

[0020] A44. A tenth and eleventh processing grooves are machined into the second protrusion and the lower plastic structure along the thickness direction of the sheet material, which are recessed into the eighth processing groove. The tenth and eleventh processing grooves are distributed on both sides of the ninth processing groove along the length direction of the sheet material. The tenth processing groove is machined into a second inner groove surface and several second perforations that penetrate the second plate surface along the thickness direction of the sheet material to form the lower inner surface of the lower middle frame.

[0021] A45. The material is cut on both sides along the length of the sheet in the continuous material area to form two second forming blanks.

[0022] Furthermore, step A5 includes the following sub-steps:

[0023] A51. Machining a lower side plate along the thickness direction around the first and second lower side edges;

[0024] A52. Machine a lower functional hole on the lower side corresponding to the tenth machining groove.

[0025] The folding machine middle frame processing method of the present invention further includes processing the upper middle frame, and the processing of the upper middle frame includes the following steps:

[0026] S1. Provide a sheet material, the sheet material including a connecting area and a first processing area and a second processing area symmetrically distributed on opposite sides of the connecting area along the length of the sheet material, the first processing area and the second processing area each including a first side surface and a second side surface distributed opposite to each other along the thickness direction of the sheet material.

[0027] S2. A first forming area adapted to one side of the upper back plate of the upper middle frame is processed on the first side of the first processing area and the second processing area, and a second forming area adapted to the upper inner side of the upper middle frame is processed on the second side. An upper injection groove that penetrates the second forming area is opened on the first forming area along the thickness direction of the sheet material.

[0028] S3. Inject liquid plastic into each upper injection tank to form an upper plastic structure;

[0029] S4. After machining the upper back plate and upper shaft groove on the first molding area and plastic structure, and machining the upper inner side on the second molding area and upper plastic structure, disconnect the connecting material area to form two first molding blanks.

[0030] S5. Machining the upper side plate and each upper hole structure on the first forming blank to form the upper middle frame.

[0031] Furthermore, step S2 includes the following sub-steps:

[0032] S21. First processing grooves adapted to the upper back plate and recessed relative to the first side of the first processing area and the second processing area are processed. The two first processing grooves are connected to each other along the length of the plate to form a first forming area.

[0033] S22. An upper injection groove is processed on the side of the first processing groove, which extends through the second forming area along the thickness direction of the sheet metal. The upper injection groove includes a first injection part processed on the side of the first processing groove away from the connecting material area and two second injection parts processed on the two sides of the first processing groove that are relatively distributed along the width direction of the sheet metal.

[0034] S23. On the second side of the first processing area and the second processing area, at the position opposite to the first processing groove, a second processing groove adapted to the upper inner side is processed along the thickness direction. A third processing groove is processed from the second processing groove along the thickness direction to be recessed into the second processing groove. A fourth processing groove is opened on the second processing groove along the thickness direction of the sheet and located outside the third processing groove near the connecting material area. A first protrusion adapted to the upper inner side is processed on the side of the third processing groove near the first processing groove. A first partition is formed on the second processing groove between the third processing groove and the fourth processing groove to separate and form a second molding area. The first injection part passes through the third processing groove. A part of the two second injection parts passes through the third processing groove and the other part passes through the second processing groove located on the two sides of the third processing groove that are relatively distributed along the width direction of the sheet.

[0035] Furthermore, in step S22: the two first processing grooves are processed along the thickness direction of the sheet material on one side near the connecting area and on the connecting area, the connecting area is thinned, and a stepped upper step groove is formed on one side of the two first processing grooves near the connecting area.

[0036] Furthermore, step S4 includes the following sub-steps:

[0037] S41. A rough blank for an upper shaft groove is machined on the upper step groove to fit the shaft of the folding machine.

[0038] S42. On the first side and outside the opening of the first processing groove, the upper plastic structure corresponding to the upper middle frame is thinned along the thickness direction of the first side and the first processing groove to process a first upper side that surrounds the opening of the first processing groove and a first plate that is located inside the first upper side and adapted to the upper back plate. The upper plastic structure is a part of the first plate and is distributed around the first upper side, and a part of the upper plastic structure is located on the first upper side.

[0039] S43. On the second side and outside the opening of the second processing groove, the upper plastic structure corresponding to the upper middle frame is thinned along the thickness direction of the second side and the second processing groove to process a second upper side that surrounds the opening of the second processing groove. The first upper side and the second upper side correspond to each other in the thickness direction of the sheet material, and part of the upper plastic structure is located on the second upper side.

[0040] S44. A fifth processing groove is processed on the side of the second processing groove near the connecting material area, and a sixth processing groove is processed on both sides of the second processing groove outside the width direction of the fourth processing groove along the plate. A first protrusion is processed on the third processing groove along the thickness direction of the plate. A first inner groove surface and several first through holes through the first plate surface along the thickness direction of the plate are processed on the first protrusion corresponding to the upper inner side surface to form the upper inner side surface of the upper middle frame.

[0041] S45. The material is cut on both sides along the length of the sheet in the continuous material area to form two first forming blanks.

[0042] Furthermore, step S5 includes the following sub-steps:

[0043] S51. An upper side plate is processed along the thickness direction around the first and second upper side edges, and an upper plastic structure forms an upper partition strip on the upper back plate.

[0044] S52. On the upper side, corresponding to the first machining groove, the second machining groove, the third machining groove and the sixth machining groove, upper functional holes are respectively machined;

[0045] S53. A hole is drilled in the blank of the upper shaft groove to form the upper shaft groove.

[0046] The folding machine middle frame processing method of the present invention has at least the following beneficial effects: by symmetrically forming the third processing area and the fourth processing area, two lower middle frames can be formed after processing, which can speed up the processing efficiency to a certain extent; by sequentially slotting to gradually realize the processing of the third forming area and the fourth forming area, the processing of the lower middle frame is completed in a thinning manner, so that the processing is completed in a reasonable and orderly manner. Attached Figure Description

[0047] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0048] Figure 1 This is a flowchart illustrating the overall processing flow of the lower frame in this invention.

[0049] Figure 2 This is a flowchart of the sub-steps of step A2 in this invention;

[0050] Figure 3 This is a schematic diagram of the structure after processing in step A22 of this invention;

[0051] Figure 4 This is a schematic diagram of the structure after processing in step A223 of this invention;

[0052] Figure 5 This is a schematic diagram of the structure after processing in step A3 of this invention;

[0053] Figure 6 This is a flowchart of the sub-steps of step A4 in this invention;

[0054] Figure 7 This is a schematic diagram of the structure after processing in step A4 of this invention;

[0055] Figure 8 This is a schematic diagram of the structure from another angle after processing in step A4 of this invention;

[0056] Figure 9 This is a flowchart of the sub-steps of step A5 in this invention;

[0057] Figure 10 This is a schematic diagram of the structure after processing in step A5 of this invention;

[0058] Figure 11 This is a schematic diagram of the structure from another angle after processing in step A5 of this invention;

[0059] Figure 12 This is a flowchart illustrating the overall processing flow of the upper and middle frames in this invention.

[0060] Figure 13 This is a flowchart of the sub-steps of step S2 in this invention;

[0061] Figure 14 This is a schematic diagram of the structure after processing in step S22 of this invention;

[0062] Figure 15 This is a schematic diagram of the structure after processing in step S23 of this invention;

[0063] Figure 16This is a schematic diagram of the structure processed in step S3 of this invention;

[0064] Figure 17 This is a flowchart of the sub-steps of step S4 in this invention;

[0065] Figure 18 This is a schematic diagram of the structure after processing in step S4 of this invention;

[0066] Figure 19 This is a schematic diagram of the structure from another angle after processing in step S4 of this invention;

[0067] Figure 20 This is a flowchart of the sub-steps of step S5 in this invention;

[0068] Figure 21 This is a schematic diagram of the structure after processing in step S5 of this invention;

[0069] Figure 22 This is a structural diagram of the hairstyle after step S5 processing from another angle.

[0070] The meanings of the labels in the attached diagram are as follows:

[0071] Sheet 1, Connecting Material Area 11, First Processing Area 12, Second Processing Area 13, First Side 14, Second Side 15, First Molding Area 16, Second Molding Area 17, Upper Injection Tank 18, First Injection Part 181, Second Injection Part 182, Upper Extension Groove 183, First Processing Groove 191, Positioning Groove 192, First Material Reduction Groove 193, Upper Step Groove 194, Second Processing Groove 195, Third Processing Groove 196, Fourth Processing Groove 197, First 198. Protrusion 198, First positioning hole 1981, First partition 199, First upper side 20, First plate surface 21, Second upper side 22, Protruding strip structure 23, Fifth machining groove 24, Sixth machining groove 25, First molding blank 26, Upper plastic structure 30, Upper back plate 31, Upper pivot groove 32, First protruding structure 331, Second protruding structure 332, Third protruding structure 333, Card holder hole 341, Power hole 342, Volume hole 343, Mute key hole 344, Upper 35. Partition strip 36. Upper side panel 37. Upper inner groove 38. Upper back groove 39. Upper inner side 39. Third processing area 41. Fourth processing area 42. Third side 43. Fourth side 44. Third molding area 45. Fourth molding area 46. Lower injection tank 47. Third injection part 471. Fourth injection part 472. Lower extension groove 473. Seventh processing groove 481. Second material reduction groove 482. Lower step groove 483. Eighth processing groove 484. Ninth processing groove 485 Second protrusion 486, second positioning hole 4861, second forming blank 49, second plate surface 50, first lower side 51, second lower side 52, tenth processing groove 53, eleventh processing groove 54, lower plastic structure 60, lower back plate 61, lower pivot groove 62, fourth protrusion structure 631, fifth protrusion structure 632, sixth protrusion structure 633, lower inner side 64, lower back groove 65, lower side plate 66, lower partition strip 67, USB hole 681, volume hole 682. Detailed Implementation

[0072] The invention will now be further described with reference to the accompanying drawings.

[0073] The folding machine frame of the present invention includes an upper frame and a lower frame.

[0074] The upper frame includes a square upper back plate 31 and upper side plates 36 surrounding three adjacent sides of the upper back plate 31, with chamfered edges between adjacent upper side plates 36. One side of the upper back plate 31 is recessed relative to the upper side plate 36 to form an upper back groove 38, and the other side of the upper back plate 31 is recessed relative to the upper side plate 36 to form an upper inner side surface. On the side of the lower back plate 61 where the upper side plate 36 is not provided, an upper pivot groove 32 is formed that is recessed relative to the upper back plate 31, and several uneven first protruding structures are machined in the upper pivot groove 32. The upper back plate 31 has a second protruding structure that protrudes relative to the upper back plate 31, and the second protruding structure is flush with the thickness direction of the back plate. A first functional hole is formed on one of the upper side plates 36 along the width direction of the upper back plate 31. The first functional hole includes a card tray hole 341 and a power hole 342. A second functional hole is formed on the other opposite upper side plate 36 along the width direction of the upper back plate 31. The second functional hole includes a volume hole 343 and a mute button hole 344. Several uneven third protrusion structures 333 are formed on the upper inner side of the upper back plate 31.

[0075] The lower frame includes a lower back panel 61 oriented in a certain direction and lower side panels 66 surrounding three adjacent sides of the upper back panel 31, with chamfered edges between adjacent lower side panels 66. One side of the lower back panel 61 is recessed relative to the upper side panel 36 to form a lower back groove 65, and the other side of the lower back panel 61 is recessed relative to the lower side panel 66 to form a lower inner side surface 64. A lower hinge groove 62 is formed on the side of the lower back panel 61 where the lower side panel 66 is not located, and the lower hinge groove 62 has several uneven fourth protruding structures. A fifth protruding structure protrudes relative to the lower back panel 61, and the fifth protruding structure is flush with the thickness direction of the back panel. A third functional hole is formed on a lower side panel 66 of the lower back panel 61, away from the lower hinge groove 62, along the width direction of the back panel. The third functional hole includes a USB hole 681 and a volume hole 343. The lower inner side 64 of the lower back plate 61 has several uneven sixth protrusion structures 633.

[0076] Please refer to Figures 1 to 22 The middle frame processing method of the present invention includes processing the upper middle frame and processing the lower middle frame. Please refer to... Figures 12 to 22 The processing of the upper and middle frames includes the following steps:

[0077] S1. Provide a sheet material 1, the sheet material 1 includes a connecting area 11 and a first processing area 12 and a second processing area 13 symmetrically distributed on opposite sides of the connecting area 11 along the length direction of the sheet material 1. The first processing area 12 and the second processing area 13 each include a first side 14 and a second side 15 distributed opposite to each other along the thickness direction of the sheet material 1.

[0078] In this step, the sheet material 1 can be either extruded aluminum or die-cast aluminum. The sheet material 1 is rectangular and has a length, width, and thickness. The sheet material 1 is divided into three areas: the middle part is the connecting area 11, and the parts of the sheet material 1 outside the connecting area 11 along the length of the sheet material 1 are respectively divided into the first processing area 12 and the second processing area 13, so that the two upper middle frames can be processed at the same time, and the connecting area 11 provides convenience for fixing the sheet material 1.

[0079] S2, please refer to Figures 12 to 15 A first forming area 16 adapted to one side of the upper back plate 31 of the upper middle frame is processed on the first side 14 of the first processing area 12 and the second processing area 13, and a second forming area 17 adapted to the upper inner side of the upper middle frame is processed on the second side 15. An upper injection groove 18 that penetrates the second forming area 17 is provided on the first forming area 16 along the thickness direction of the plate 1.

[0080] Step S2 includes the following sub-steps:

[0081] S21. On the first side 14 of the first processing area 12 and the second processing area 13, a first processing groove 191 adapted to the upper back plate 31 and recessed relative to the first side 14 is processed. The two first processing grooves 191 pass through the connecting material area 11 in opposite directions along the length of the plate 1 to form the first forming area 16.

[0082] In this step, the sheet material 1 is first double-sided ground, and then the first side surface 14 is processed after the sheet material 1 is fixed. After the sheet material 1 is fixed to a certain thickness, CNC machining equipment is used to sequentially thin the first side surface 14, thinning the first processing area 12, the second processing area 13, and the connecting area 11 together to create a groove structure, so that the first processing area 12 and the second processing area 13 have mutually connected first processing grooves 191. In this step, recessed positioning grooves 192 are machined on the four sides of the sheet material 1 to facilitate subsequent positioning of the sheet material 1. The positioning grooves 192 are relatively shallow, and each positioning groove 192 reserves the processing position and area for the upper middle frame. A first material reduction groove 193 is formed on the connecting area 11 along the thickness direction of the sheet material 1, facilitating subsequent processing of the connecting area 11 and positioning of the sheet material 1. After processing, the side wall of the first processing groove 191 facing the second side surface 15 along the thickness direction of the sheet material 1 corresponds to a part of the upper back plate 31.

[0083] S22. An upper injection groove 18 is processed on the edge of the first processing groove 191, which penetrates the second molding area 17 along the thickness direction of the sheet 1. The upper injection groove 18 includes a first injection part 181 processed on the side of the first processing groove 191 away from the connecting material area 11 and two second injection parts 182 respectively processed on the two sides of the first processing groove 191 that are relatively distributed along the width direction of the sheet 1.

[0084] In this step: The two first processing grooves 191 are processed along the thickness direction of the sheet material 1 on one side near the connecting area 11, and on the connecting area 11 itself. The connecting area 11 is thinned, forming a stepped upper groove 194 on one side of the two first processing grooves 191 near the connecting area 11. During processing, CNC machining is used to process the two first processing grooves 191 facing each other and the connecting area 11 together to form the first groove structure. Then, the two first processing grooves 191 and the connecting area 11 are further thinned relative to the middle of the first groove structure to form a second groove structure. The first groove structure and the second groove structure together form the upper stepped groove 194.

[0085] In this step, the upper injection groove 18 has an irregular shape. Since the sheet 1 is made of metal, the all-metal structure can easily cause electrical signals to be blocked and unable to be transmitted during use. Therefore, the upper plastic structure 30 is mainly used to isolate the metal and ensure its connection so that electrical signals can be transmitted. In order to ensure the normal use of the function keys of the corresponding folding machine for each of the first and second function holes, the upper injection groove 18 is opened on the three sides of the first processing groove 191. The side corresponding to the upper step groove 194 is used to open the upper pivot groove 32, so the upper plastic structure 30 is not required. Therefore, the first injection part 181 is located on the side away from the upper step groove 194 along the length direction of the sheet 1, and the two second injection parts 182 are opened on both sides of the first processing groove 191 along the width direction of the sheet 1. The structures of the first injection part 181 and the second injection part 182 are adapted to the third protrusion structure 333 on the inner side of the upper frame. In this embodiment, both the first injection molding portion 181 and the second injection molding portion 182 have upper extension grooves 183 machined on the sidewalls of the second processing groove 195. The upper extension grooves 183 are part of the upper injection molding groove 18 and extend through the sheet 1 along its thickness direction. It should be noted that the upper extension grooves 183 extend away from the first processing groove 191 beyond the reserved portion of the sheet 1 that fits into the upper middle frame, so as to separate the metal portion during subsequent injection molding to form the upper plastic structure 30. In this embodiment, the first processing groove 191 corresponds to the upper back groove 38.

[0086] S23. On the second side surface 15 of the first processing area 12 and the second processing area 13, at a position opposite to the first processing groove 191, a second processing groove 195 adapted to the upper inner side surface is machined along the thickness direction. A third processing groove 196 recessed into the second processing groove 195 is machined along the thickness direction from the second processing groove 195. A fourth processing groove 197 is formed on the second processing groove 195. The fourth processing groove 197 is located along the thickness direction of the plate 1 on the side of the third processing groove 196 near the connecting area 11. A first protrusion 198 adapted to the upper inner side is machined on one side near the first processing groove 191. A first partition 199 is formed on the second processing groove 195 between the third processing groove 196 and the fourth processing groove 197 to separate and form a second molding area 17. The first injection part 181 passes through the third processing groove 196. A part of the two second injection parts 182 passes through the third processing groove 196 and another part passes through the second processing groove 195 located on both sides of the third processing groove 196 that are relatively distributed along the width direction of the sheet 1.

[0087] In this step, the second processing groove 195 is formed corresponding to the upper inner groove 37. During processing, after the CNC machining equipment processes the second processing groove 195 along the thickness direction of the sheet 1, it processes the second processing groove 195 near the first side 14. First, the third processing groove 196 is processed on the side away from the connecting area 11, avoiding processing the portion corresponding to the third protrusion structure 333, so that after the third processing groove 196 is completed, a protruding first protrusion 198 is formed in the third processing groove 196. The portion between the second processing groove 195 and the third processing groove 196 is not connected, forming the first partition 199. After the processing in this step is completed, it is fully inspected and polished to remove burrs, and then E-processed before proceeding to the next step. In this step, in order to ensure a more stable connection between the upper plastic structure 30 and the inner wall of the upper injection molding groove 18 after injection molding, uneven material hanging grooves and material hanging protrusions are processed on the inner wall of the upper injection molding groove 18. In this step, in order to prevent any obstruction to the subsequent processing of the upper side plate 36, a first positioning hole 1981 is provided on the first protrusion 198.

[0088] S3, please refer to Figure 16 Molten plastic is injected into each upper injection tank 18 to form the upper plastic structure 30. After this step is completed, the sheet 1 is fully inspected to prevent unqualified products from entering the next processing step.

[0089] S4, please refer to Figures 17 to 19 The upper back plate 31 and the upper pivot groove 32 are machined on the first molding area 16 and the plastic structure. The upper inner side is machined on the second molding area 17 and the upper plastic structure 30, and then the connecting material area 11 is disconnected to form two first molding blanks 26.

[0090] Step S4 includes the following sub-steps:

[0091] S41. A rough blank of an upper rotating shaft groove 32 is machined on the upper step groove 194 to be adapted to the rotating shaft of the folding machine.

[0092] In this step, the upper stepped groove 194 on the first processing area 12 and the second processing area 13 is processed to form a first protrusion structure 331 corresponding to the first groove structure. Several first bosses of the same height are processed from the first protrusion structure 331. At least two of the first bosses need to be machined with hole structures, while the other first protrusion structures 331 are lower than the first bosses and are further processed to form them. Then, processing is carried out corresponding to the second groove structure until an upper rotating shaft groove 32 blank with the same structure as the upper rotating shaft groove 32 is formed. At this time, since some hole structures are not processed, it is called the upper rotating shaft groove 32 blank.

[0093] S42. The upper side plate 36, located on the first side 14 and outside the opening of the first processing groove 191 and corresponding to the upper middle frame, is thinned along the thickness direction. The upper plastic structure 30 inside the first processing groove 191 is also thinned to process a first upper side 20 surrounding the opening of the first processing groove 191 and a first plate surface 21 located inside the first upper side 20 and adapted to the upper back plate 31. The upper plastic structure 30 is a part of the first plate surface 21 and is distributed around the first upper side 20, and a part of the upper plastic structure 30 is located on the first upper side 20.

[0094] In this step, the upper plastic structure 30 is processed to correspond to the second protruding structure 332. For the first upper side 20, only a portion of the upper side plate 36 structure is processed, thereby initially determining the position of the upper side plate 36, while retaining the positioning groove 192 outside the plate 1 to facilitate fixing the plate 1 during further processing. In this step, the first upper side 20 has only three edges processed corresponding to the upper side plate 36, and an upper extension groove 183 is processed on the first upper side 20 to separate the upper plastic structure 30 to the first upper side 20.

[0095] S43. The upper side plate 36 on the second side 15, located outside the groove of the second processing groove 195 and corresponding to the upper middle frame, is thinned along the thickness direction of the second side 15 and the upper plastic structure 30 inside the second processing groove 195 is thinned to process a second upper side 22 surrounding the groove of the second processing groove 195. The first upper side 20 and the second upper side 22 correspond to each other in the thickness direction of the plate 1, and part of the upper plastic structure 30 is located on the second upper side 22.

[0096] In this step, the processing of the upper plastic structure 30 is to remove the excess portion of the upper plastic structure 30, that is, the plastic portion located in the inlet or venting structure during injection molding, so that the second processing groove 195 can form the upper inner groove 37. The second upper side 22 has the same function as the first upper side 20, the difference being that a raised strip structure 23 is retained on the side of the second side 15 near the connecting material area 11. The two ends of the raised strip structure 23 are respectively connected to the two second upper side 22 to form a closed frame structure, and the second processing groove 195 is located within the second upper side 22 and the raised strip structure 23.

[0097] S44. A fifth processing groove 24 is processed on the side of the second processing groove 195 near the connecting material area 11, and a sixth processing groove 25 is processed on both sides of the second processing groove 195 outside the width direction of the fourth processing groove 197. A first protrusion 198 protruding along the thickness direction of the plate 1 is processed on the third processing groove 196. A first inner groove surface and several first through holes penetrating the first plate surface 21 along the thickness direction of the plate 1 are processed on the first protrusion 198 corresponding to the upper inner side surface 39 to form the upper inner side surface of the upper middle frame.

[0098] In this step, the fifth processing groove 24 and the sixth processing groove 25 are set independently of the third processing groove 196 and the fourth processing groove 197, respectively. The fifth processing groove 24 is opened corresponding to the battery connection structure and is connected to the fourth processing groove 197. The sixth processing groove 25 is opened in four places corresponding to the positions of the first functional hole and the second functional hole. Each sixth processing groove 25 is through along the width direction of the plate 1, so as to form the card holder hole 341, power hole 342, volume hole 343 and mute key hole 344 respectively after the upper side plate 36 is processed, so as to facilitate the subsequent installation of card holder key, power key, etc. The first inner groove surface is formed on the first protrusion 198 corresponding to the upper inner surface 39, and the third processing groove 196 and the fourth processing groove 197 are processed to form the upper inner surface 39. The first through hole is formed by fine machining based on the first positioning hole 1981.

[0099] S45. The material is cut on both sides of the continuous material area 11 along the length of the sheet 1 to form two first forming blanks 26.

[0100] In this step, the first forming blank 26 has been machined with an upper back plate 31, an upper back groove 38, an upper inner groove 37, and an upper inner side surface 39. After this step, the first forming blank 26 is polished to remove burrs and then cleaned.

[0101] S5, please refer to Figures 20 to 22 The upper side plate 36 and various upper hole structures are machined on the first forming blank 26 to form the upper middle frame.

[0102] Step S5 includes the following sub-steps:

[0103] S51. An upper side plate 36 is processed along the thickness direction around the first upper side 20 and the second upper side 22, and an upper plastic structure 30 forms an upper partition strip 35 on the upper back plate 31.

[0104] In this step, the first forming blank 26 is fixed through the first positioning hole 1981, and the excess part of the plate 1 is cut off to form the upper side plate 36. The upper plastic structure 30 corresponds to the three upper side plates 36 respectively, that is, the upper extension groove 183 is opened on the three upper side plates 36. The corresponding upper plastic structure 30 forms an upper partition strip 35 on the three upper side plates 36 to avoid the upper middle frame being all metal and affecting signal transmission. After this step, it is cleaned and fully inspected, and then the upper side plate 36 is polished.

[0105] S52. On the upper side, corresponding to the first machining groove 191, the second machining groove 195, the third machining groove 196 and the sixth machining groove 25, upper functional holes are respectively machined.

[0106] In this step, the upper functional holes include first functional holes and second functional holes. After the upper side plate 36 is formed, each of the first and second functional holes extends through the upper side plate 36 along the width direction of the plate 1. After deburring the area, a full inspection is performed again, followed by a second grinding using fine grinding. After another full inspection, anodizing is carried out, followed by a full inspection. Each processing of a functional hole requires a full inspection.

[0107] S53. A hole is drilled in the rough blank of the upper shaft groove 32 to form the upper shaft groove 32.

[0108] After this step, continue polishing to remove burrs, then conduct a full inspection. After laser engraving the necessary markings, assemble the auxiliary materials, conduct a full inspection and packaging, and finally ship the product.

[0109] Please refer to Figures 1 to 11 The processing of the lower middle frame of the present invention includes the following steps:

[0110] A1. A sheet material 1 is provided, the sheet material 1 includes a connecting area 11 and a third processing area 41 and a fourth processing area 42 symmetrically distributed on opposite sides of the connecting area 11 along the length direction of the sheet material 1. The third processing area 41 and the fourth processing area 42 each include a third side surface 43 and a fourth side surface 44 distributed opposite to each other along the thickness direction of the sheet material 1.

[0111] In this step, the sheet material 1 can be either extruded aluminum or die-cast aluminum. The sheet material 1 is rectangular and has a length, width, and thickness. The sheet material 1 is divided into three areas: the middle part is the connecting area 11, and the parts of the sheet material 1 outside the connecting area 11 along the length of the sheet material 1 are respectively divided into the third processing area 41 and the fourth processing area 42, so that the two lower middle frames can be processed at the same time, and the connecting area 11 provides convenience for fixing the sheet material 1.

[0112] A2, please refer to Figures 1 to 4 A third forming area 45 adapted to one side of the lower back plate 61 of the lower middle frame is formed on the third side 43 of the third processing area 41 and the fourth processing area 42, and a fourth forming area 46 adapted to the lower inner side 64 of the lower middle frame is formed on the fourth side 44. A lower injection groove 47 that penetrates the fourth forming area 46 is formed on the third forming area 45 along the thickness direction of the plate 1.

[0113] Step A2 includes the following sub-steps:

[0114] A21. A seventh processing groove 481 adapted to the lower back plate 61 and recessed relative to the third side 43 is processed on the third processing area 41 and the fourth processing area 42. The two seventh processing grooves 481 penetrate the connecting material area 11 in opposite directions along the length of the plate 1 to form the third forming area 45.

[0115] In this step, the plate 1 is first double-sided ground, and then the third side 43 is processed after the plate 1 is fixed. After the plate 1 is fixed, the third side 43 is thinned sequentially using CNC machining equipment, and the third processing area 41, the fourth processing area 42 and the connecting area 11 are thinned together to form a groove structure, so that the third processing area 41 and the fourth processing area 42 are processed to form a seventh processing groove 481 that runs through each other. In this step, recessed positioning grooves 192 are also processed on the four sides of the plate 1 to facilitate the subsequent positioning of the plate 1. A second material reduction groove 482 is formed on the connecting area 11 along the thickness direction of the plate 1 to facilitate the subsequent processing of the connecting area 11 and the positioning of the plate 1. After processing, the side wall of the seventh processing groove 481 facing the fourth side 44 along the thickness direction of the plate 1 corresponds to a part of the lower back plate 61.

[0116] A22. A lower injection groove 47 is machined on the edge of the seventh processing groove 481, penetrating the fourth molding area 46 along the thickness direction of the sheet 1. The lower injection groove 47 includes a third injection part 471 machined on the side of the seventh processing groove 481 away from the connecting material area 11 and two fourth injection parts 472 respectively machined on the two sides of the seventh processing groove 481 that are relatively distributed along the width direction of the sheet 1. The two seventh processing grooves 481 are thinned along the thickness direction of the sheet 1 on the side of the two seventh processing grooves 481 near the connecting material area 11 and on the connecting material area 11, so as to form a stepped lower step groove 483 on the side of the two seventh processing grooves 481 near the connecting material area 11.

[0117] In this step: The two seventh processing grooves 481 are processed along the thickness direction of the sheet material 1 on one side near the connecting area 11, and on the connecting area 11 itself. The connecting area 11 is thinned, forming a stepped lower groove 483 on one side of the two seventh processing grooves 481 near the connecting area 11. During processing, CNC machining is used to process the two seventh processing grooves 481 facing each other and the connecting area 11 together until the third groove structure is formed. Then, the two seventh processing grooves 481 and the connecting area 11 are further thinned relative to the middle of the third groove structure to form a fourth groove structure. The third and fourth groove structures together form the stepped lower groove 483.

[0118] In this step, the lower injection groove 47 has an irregular shape because the sheet metal 1 is made of metal. To ensure the normal use of the corresponding function keys of the folding machine for each third function hole, the lower injection groove 47 is opened on the three sides of the first processing groove 191. Since the side corresponding to the lower step groove 483 needs to be used to open the lower pivot groove 62, the upper plastic structure 30 is not required. Therefore, the third injection part 471 is located on the side away from the upper step groove 194 along the length direction of the sheet metal 1, and the two fourth injection parts 472 are opened on both sides of the seventh processing groove 481 along the width direction of the sheet metal 1. The structures of the third injection part 471 and the fourth injection part 472 are adapted to the sixth protrusion structure 633 on the lower inner side surface 64 of the lower middle frame. In this embodiment, both the third injection molding section 471 and the fourth injection molding section 472 have lower extension grooves 473 machined on the sidewall of the eighth processing groove 484. The lower extension groove 473 is part of the lower injection molding groove 47 and extends through the sheet 1 along its thickness direction. It should be noted that the lower extension groove 473 is positioned identically to the upper extension groove 183 to facilitate the separation of the metal portion during subsequent injection molding to form the lower plastic structure 60. In this embodiment, the seventh processing groove 481 is opened corresponding to the upper back groove 38.

[0119] A23. On the fourth side surface 44 of the third processing area 41 and the fourth processing area 42, an eighth processing groove 484 is machined along the thickness direction at the position opposite to the seventh processing groove 481, which is adapted to the lower inner side surface 64. A ninth processing groove 485 is machined along the thickness direction from the eighth processing groove 484 to be recessed into the eighth processing groove 484. A second protrusion 486 is formed in the eighth processing groove 484 and outside the ninth processing groove 485. The lower plastic structure 60 passes through the second protrusion 486, thereby forming the fourth molding area 46.

[0120] In this step, the eighth processing groove 484 is formed corresponding to the lower inner groove. During processing, the CNC machining equipment processes the eighth processing groove 484 along the thickness direction of the sheet 1, and then processes it on the third side 43 near the eighth processing groove 484. First, the eighth processing groove 484 is processed on the side away from the connecting material area 11, and the processing of the sixth protruding structure 633 is avoided, so that after the eighth processing groove 484 is completed, a second protrusion 486 is formed inside the eighth processing groove 484 and outside the ninth processing groove 485 relative to the ninth processing groove 485. After the processing in this step is completed, it is fully inspected and polished to remove burrs, and then E-processed before proceeding to the next step. In this step, in order to ensure a more stable connection between the lower plastic structure 60 and the inner wall of the upper injection molding groove 18 after injection molding, uneven material hanging grooves and material hanging protrusions are also processed on the inner wall of the lower injection molding groove 47. And a second positioning hole is provided on the second protrusion 486.

[0121] A3, please refer to Figure 5 Plastic liquid is injected into each of the lower injection tanks 47 to form the lower plastic structure 60.

[0122] After this step is completed, a full inspection of board 1 is carried out to prevent unqualified products from entering the next processing step.

[0123] A4, please refer to Figures 6 to 8 A lower back plate 61 and a lower pivot groove 62 are machined on the third molding area 45 and the lower plastic structure 60. After the lower inner side surface 64 is machined on the third molding area 45 and the lower plastic structure 60, the connecting material area 11 is disconnected to form two second molding blanks 49.

[0124] Step A4 includes the following sub-steps:

[0125] A41. A rough blank of a lower rotating shaft groove 62 is machined on the lower step groove 483 to fit the rotating shaft of the folding machine.

[0126] In this step, the lower step groove 483 on the third processing area 41 and the fourth processing area 42 is processed to form the fourth protrusion structure 631 corresponding to the third groove structure, and then processed to form the lower shaft groove 62 blank that is consistent with the structure of the lower shaft groove 62. At this time, since some hole structures are not processed, it is called the lower shaft groove 62 blank.

[0127] A42. The lower side plate 66, located on the third side 43 and outside the opening of the seventh processing groove 481 and corresponding to the lower middle frame, is thinned along the thickness direction. The lower plastic structure 60 inside the seventh processing groove 481 is also thinned to process a first lower side 51 surrounding the opening of the seventh processing groove 481 and a second plate surface 50 located inside the first lower side 51 and adapted to the lower back plate 61. The lower plastic structure 60 is a part of the second plate surface 50 and is distributed around the first lower side 51, and a part of the lower plastic structure 60 is located on the first lower side 51.

[0128] In this step, the lower plastic structure 60 is processed to correspond to the fourth protruding structure 631. Only a portion of the lower side plate 66 structure is processed on the first lower side 51, thus initially determining the position of the lower side plate 66, while retaining the positioning groove 192 outside the sheet 1 to facilitate fixing the sheet 1 during further processing. In this step, the first lower side 51, corresponding to the lower side plate 66, is also processed with only three edges, and a lower extension groove 473 is processed on the first lower side 51 to separate the lower plastic structure 60 to the first lower side 51.

[0129] A43. The lower side plate 66 on the fourth side 44, located outside the groove of the eighth processing groove 484 and corresponding to the lower middle frame, is thinned along the thickness direction. Then, the lower plastic structure 60 inside the eighth processing groove 484 is further thinned to process a second lower side 52 surrounding the groove of the eighth processing groove 484. The first lower side 51 and the second lower side 52 correspond to each other in the thickness direction of the plate 1. Part of the lower plastic structure 60 is located on the second lower side 52.

[0130] In this step, the processing of the lower plastic structure 60 is to remove the excess portion of the lower plastic structure 60 so that the eighth processing groove 484 can form the lower inner groove. The second lower side 52 has the same function as the first lower side 51, the difference being that the fourth side 44 also retains the protruding strip structure 23 on the side near the connecting material area 11. The two ends of the protruding strip structure 23 are respectively connected to the two second lower side 52 to form a closed frame structure, and the eighth processing groove 484 is located within the second lower side 52 and the protruding strip structure 23.

[0131] A44. A tenth processing groove 53 and an eleventh processing groove 54 recessed in the eighth processing groove 484 are machined on the second protrusion 486 and the lower plastic structure 60 along the thickness direction of the sheet 1. The tenth processing groove 53 and the eleventh processing groove 54 are distributed on both sides of the ninth processing groove 485 along the length direction of the sheet 1. The tenth processing groove 53 is machined with a second inner groove surface and several second through holes that penetrate the second plate surface 50 along the thickness direction of the sheet 1 to form the lower inner surface 64 of the lower middle frame.

[0132] In this step, the tenth machining groove 53 is formed by machining the second protrusion 486, corresponding to the lower inner surface 64 of the folding machine, forming the second inner groove surface. The ninth machining groove 485 is used to install the battery, while the tenth machining groove 53 is used to install the various circuit structures. The eleventh machining groove 54 connects to the ninth machining groove 485 for the installation of the battery charging structure, and the second through hole is formed by precision machining based on the second positioning hole 4861. The second inner groove surface, the ninth machining groove 485, and the tenth machining groove 53 together form the lower inner surface 64.

[0133] A45. The material is cut on both sides of the continuous material area 11 along the length of the sheet 1 to form two second forming blanks 49.

[0134] A5, please refer to Figures 9 to 11 The lower side plate 66 and various lower hole structures are machined on the second forming blank 49 to form the lower middle frame.

[0135] Step A5 includes the following sub-steps:

[0136] A51. A lower side plate 66 is machined along the thickness direction around the first lower side 51 and the second lower side 52, and a lower plastic structure 60 forms a lower partition strip 67 on the lower back plate 61.

[0137] A52. A lower functional hole is machined on the lower side corresponding to the tenth machining groove 53.

[0138] In this step, the lower functional hole is the third functional hole, including a USB hole 681 and a volume hole 343 opened on the lower side plate 66. Both the USB hole 681 and the volume hole 343 are opened on the lower side plate 66 on the side of the plate 1 away from the lower pivot groove 62 along the length direction of the plate 1 and are connected to the tenth processing groove 53.

[0139] A53. A hole is drilled in the blank of the lower shaft groove 62 to form the lower shaft groove 62.

Claims

1. A method for processing a folding machine middle frame, the folding machine middle frame comprising an upper middle frame and a lower middle frame, the upper middle frame and the lower middle frame being connected by a pivot to enable folding between the upper middle frame and the lower middle frame; characterized in that, This includes processing the lower middle frame, which includes the following steps: A1. A sheet material is provided, the sheet material includes a connecting area and a third processing area and a fourth processing area symmetrically distributed on opposite sides of the connecting area along the length of the sheet material, the third processing area and the fourth processing area each include a third side surface and a fourth side surface distributed opposite to each other along the thickness direction of the sheet material. A2. A third forming area adapted to one side of the lower back plate of the lower middle frame is processed on the third side of both the third and fourth processing areas, and a fourth forming area adapted to the lower inner side of the lower middle frame is processed on the fourth side. A lower injection groove that penetrates the fourth forming area is provided on the third forming area along the thickness direction of the sheet metal. A3. Inject molten plastic into each injection tank to form the lower plastic structure; A4. Process the lower back plate and lower pivot groove on the third molding area and the lower plastic structure, and then process the lower inner side on the third molding area and the lower plastic structure to disconnect the connecting material area to form two second molding blanks. A5. Machining the lower side plate and each lower hole structure on the second forming blank to form the lower middle frame; It also includes processing the upper middle frame, which includes the following steps: S1. Provide a sheet material, the sheet material including a connecting area and a first processing area and a second processing area symmetrically distributed on opposite sides of the connecting area along the length of the sheet material, the first processing area and the second processing area each including a first side surface and a second side surface distributed opposite to each other along the thickness direction of the sheet material. S2. A first forming area adapted to one side of the upper back plate of the upper middle frame is processed on the first side of the first processing area and the second processing area, and a second forming area adapted to the upper inner side of the upper middle frame is processed on the second side. An upper injection groove that penetrates the second forming area is opened on the first forming area along the thickness direction of the sheet material. S3. Inject liquid plastic into each upper injection tank to form an upper plastic structure; S4. After machining the upper back plate and upper shaft groove on the first molding area and plastic structure, and machining the upper inner side on the second molding area and upper plastic structure, disconnect the connecting material area to form two first molding blanks. S5. Machining the upper side plate and each upper hole structure on the first forming blank to form the upper middle frame.

2. The method for processing the middle frame of a folding machine as described in claim 1, characterized in that, Step A2 includes the following sub-steps: A21. A seventh processing groove adapted to the lower back plate and recessed relative to the third side is processed on the third side of both the third processing area and the fourth processing area. The two seventh processing grooves penetrate the connecting material area in opposite directions along the length of the plate to form the third forming area. A22. A lower injection groove is processed on the edge of the seventh processing groove, which penetrates the fourth forming area along the thickness direction of the sheet metal. The lower injection groove includes a third injection part processed on the side of the seventh processing groove away from the connecting material area and two fourth injection parts processed on the two sides of the seventh processing groove that are respectively distributed opposite to each other along the width direction of the sheet metal. A23. On the fourth side of the third and fourth processing areas, an eighth processing groove is machined along the thickness direction at the position opposite to the seventh processing groove, which is adapted to the lower inner side. A ninth processing groove is machined along the thickness direction from the eighth processing groove to be recessed into the eighth processing groove. A second protrusion is formed inside the eighth processing groove and outside the ninth processing groove. The lower plastic structure passes through the second protrusion to form the fourth molding area.

3. The method for processing the middle frame of a folding machine as described in claim 2, characterized in that, In step A22: the two seventh processing grooves are thinned along the thickness direction of the plate on the side of the connecting area and on the connecting area, so as to form a stepped lower step groove on the side of the two seventh processing grooves near the connecting area.

4. The method for processing the middle frame of a folding machine as described in claim 3, characterized in that, Step A4 includes the following sub-steps: A41. A rough blank for the lower shaft groove is machined on the lower step groove to fit the shaft of the folding machine. A42. On the third side surface and outside the groove of the seventh processing groove, the lower plastic structure corresponding to the lower middle frame is thinned along the thickness direction of the third side surface and the seventh processing groove to process a first lower side edge surrounding the groove of the seventh processing groove and a second plate surface located inside the first lower side edge and adapted to the lower back plate. The lower plastic structure is a part of the second plate surface and is distributed around the first lower side edge, and a part of the lower plastic structure is located on the first lower side edge. A43. On the fourth side and outside the opening of the eighth processing groove, the lower plastic structure corresponding to the lower middle frame is thinned along the thickness direction of the fourth side and the eighth processing groove to process a second lower side that surrounds the opening of the eighth processing groove. The first lower side and the second lower side correspond to each other in the thickness direction of the sheet material, and part of the lower plastic structure is located on the second lower side. A44. A tenth and eleventh processing grooves are machined into the second protrusion and the lower plastic structure along the thickness direction of the sheet material, which are recessed into the eighth processing groove. The tenth and eleventh processing grooves are distributed on both sides of the ninth processing groove along the length direction of the sheet material. The tenth processing groove is machined into a second inner groove surface and several second perforations that penetrate the second plate surface along the thickness direction of the sheet material to form the lower inner surface of the lower middle frame. A45. The material is cut on both sides along the length of the sheet in the continuous material area to form two second forming blanks.

5. The method for processing the middle frame of a folding machine as described in claim 4, characterized in that, Step A5 includes the following sub-steps: A51. A lower side plate is machined along the thickness direction around the first and second lower side edges, and a lower plastic structure forms a partition strip on the lower back plate. A52. Machine a lower functional hole on the lower side corresponding to the tenth machining groove; A53. A hole is drilled in the blank of the lower shaft groove to form the lower shaft groove.

6. The method for processing the middle frame of a folding machine as described in claim 1, characterized in that, Step S2 includes the following sub-steps: S21. First processing grooves adapted to the upper back plate and recessed relative to the first side of the first processing area and the second processing area are processed. The two first processing grooves are connected to each other along the length of the plate to form a first forming area. S22. An upper injection groove is processed on the side of the first processing groove, which extends through the second forming area along the thickness direction of the sheet metal. The upper injection groove includes a first injection part processed on the side of the first processing groove away from the connecting material area and two second injection parts processed on the two sides of the first processing groove that are relatively distributed along the width direction of the sheet metal. S23. On the second side of the first processing area and the second processing area, at the position opposite to the first processing groove, a second processing groove adapted to the upper inner side is processed along the thickness direction. A third processing groove is processed from the second processing groove along the thickness direction to be recessed into the second processing groove. A fourth processing groove is opened on the second processing groove along the thickness direction of the sheet and located outside the third processing groove near the connecting material area. A first protrusion adapted to the upper inner side is processed on the side of the third processing groove near the first processing groove. A first partition is formed on the second processing groove between the third processing groove and the fourth processing groove to separate and form a second molding area. The first injection part passes through the third processing groove. A part of the two second injection parts passes through the third processing groove and the other part passes through the second processing groove located on the two sides of the third processing groove that are relatively distributed along the width direction of the sheet.

7. The method for processing the middle frame of a folding machine as described in claim 6, characterized in that, In step S22: the two first processing grooves are processed along the thickness direction of the plate on one side near the connecting area and on the connecting area, the connecting area is thinned, and a stepped upper step groove is formed on one side near the connecting area of ​​the two first processing grooves.

8. The method for processing the middle frame of a folding machine as described in claim 7, characterized in that, Step S4 includes the following sub-steps: S41. A rough blank for an upper shaft groove is machined on the upper step groove to fit the shaft of the folding machine. S42. On the first side and outside the opening of the first processing groove, the upper plastic structure corresponding to the upper middle frame is thinned along the thickness direction of the first side and the first processing groove to process a first upper side that surrounds the opening of the first processing groove and a first plate that is located inside the first upper side and adapted to the upper back plate. The upper plastic structure is a part of the first plate and is distributed around the first upper side, and a part of the upper plastic structure is located on the first upper side. S43. On the second side and outside the opening of the second processing groove, the upper plastic structure corresponding to the upper middle frame is thinned along the thickness direction of the second side and the second processing groove to process a second upper side that surrounds the opening of the second processing groove. The first upper side and the second upper side correspond to each other in the thickness direction of the sheet material, and part of the upper plastic structure is located on the second upper side. S44. A fifth processing groove is processed on the side of the second processing groove near the connecting material area, and a sixth processing groove is processed on both sides of the second processing groove outside the width direction of the fourth processing groove along the plate. A first protrusion is processed on the third processing groove along the thickness direction of the plate. A first inner groove surface and several first through holes through the first plate surface along the thickness direction of the plate are processed on the first protrusion corresponding to the upper inner side surface to form the upper inner side surface of the upper middle frame. S45. The material is cut on both sides along the length of the sheet in the continuous material area to form two first forming blanks.

9. The method for processing the middle frame of a folding machine as described in claim 8, characterized in that, Step S5 includes the following sub-steps: S51. An upper side plate is processed along the thickness direction around the first and second upper side edges, and an upper plastic structure forms an upper partition strip on the upper back plate. S52. On the upper side, corresponding to the first machining groove, the second machining groove, the third machining groove and the sixth machining groove, upper functional holes are respectively machined; S53. A hole is drilled in the blank of the upper shaft groove to form the upper shaft groove.

Images