Mobile phone face shell assembly metal plate thermal shaping device

Abstract

The invention discloses a mobile phone face shell assembly metal plate thermal shaping device, and belongs to the technical field of mobile phone face shell machining auxiliary equipment. The shaping device comprises an upper die holder, a lower die holder and a grabbing assembly, the upper die holder and the lower die holder can be attached to a metal plate in a thermal contact mode, and the grabbing assembly directly makes contact with the high-temperature metal plate. The grabbing assembly comprises a driving handle capable of vertically moving and rotating and a core barrel, and a core barrel sliding shaft can elastically move in the radial direction to abut against a large metal plate round hole. A core column in the driving handle can push the sliding shaft to fix the metal plate, and a transmission rack, a swing arm and a clamping component rotating synchronously are arranged on the side portion of the driving handle. The clamping part drives the clamping plate through the speed increasing gear assembly to press the side wall of the rectangular strip hole of the metal plate. During work, the driving handle moves downwards to enable the sliding shaft to abut against the large round hole, the swing arm is clamped into the small round hole after rotation, the swing arm continues to move downwards to drive the clamping component, and stable grabbing of the metal plate is achieved. The mobile phone face shell metal plate can be accurately and reliably positioned and clamped, and the problems that in the prior art, when the face shell metal plate is transferred through a suction cup, heat resistance is poor, loosening, displacement and even falling are likely to happen, and the face shell metal plate cannot be preheated are solved.

Description

Technical Field

[0001] This invention belongs to the technical field of auxiliary equipment for mobile phone casing processing, and more specifically, it is a sheet metal hot forming device for mobile phone casing components. Background Technology

[0002] Currently, the forming of sheet metal covers mainly relies on stamping processes. However, the sheet metal covers formed by stamping are prone to defects such as slight warping, deformation, and contour offset due to factors such as material stress release, mold precision deviation, and stamping parameter fluctuations. These defects cannot directly meet assembly requirements. Therefore, it is necessary to perform shaping treatment on the formed sheet metal covers to correct the above defects. In existing mobile phone shell sheet metal shaping technology, thermal shaping has become the mainstream method for shaping thin sheet metal parts due to its stable shaping effect and low likelihood of secondary stress residue. Its core principle is to place the sheet metal shell in a preset temperature environment and achieve shape correction through mold closing and extrusion. However, existing mobile phone shell sheet metal thermal shaping devices have many shortcomings in practical applications: Firstly, thermal shaping requires preheating the sheet metal shell in a high-temperature environment. Existing gripping and transfer mechanisms mostly use negative pressure adsorption methods such as rubber suction cups. Rubber materials are prone to aging and deformation in high-temperature environments, making it practically impossible to maintain prolonged and direct contact with the high-temperature sheet metal shell. Furthermore, negative pressure adsorption requires a high degree of surface smoothness for thin sheet metal shells. Processing marks and local depressions on the sheet metal shell surface, especially in areas where the sheet metal to be shaped may not meet the set unevenness, can easily cause the suction cups to loosen, leading to gripping and positioning errors or even failure to grip and transfer properly.

[0003] Furthermore, existing hot forming devices' negative pressure adsorption gripping mechanisms cannot frequently approach the heated mold base, nor can they directly grip the preheated sheet metal. Moreover, during transport, a small portion of the sheet metal is prone to significant localized cooling deformation due to temperature loss. This can lead to the shaped sheet metal suddenly loosening and shifting during transport, making it impossible to accurately place on the material stack, or even causing it to fall and scratch. Therefore, to mitigate these drawbacks, existing technologies selectively heat the upper and lower mold bases, placing the cold sheet metal directly into the heated mold base for hot pressing. While this method reduces the high-temperature working time between the suction cup and the sheet metal, it still cannot fundamentally prevent aging and failure due to high-temperature contact. Summary of the Invention In view of the current state of the technology mentioned in the background, and in order to overcome the corresponding defects in the prior art, the present invention specifically discloses a sheet metal thermal shaping device for mobile phone face shell components. This device can effectively solve the problem that traditional suction cups are prone to loosening or even falling off due to sheet metal deformation or insufficient smoothness during gripping, and also solves the problem that traditional suction cups are difficult to withstand the high-temperature shaping environment frequently and for a long time during adsorption and gripping.

[0004] To overcome the deficiencies of the prior art, those skilled in the art provide the following technical solution: a sheet metal thermal forming device for a mobile phone faceplate assembly, comprising a lower mold base and an upper mold base for fitting with sheet metal, at least one of the two mold bases being heated to make thermal contact with the sheet metal, and further comprising a gripping component that can directly contact the high-temperature faceplate sheet metal, the gripping component comprising a drive handle and a core cylinder, the drive handle being able to move vertically and rotate, the top end of the core cylinder being axially slidably mounted inside the bottom end of the drive handle, and a plurality of sliding shafts being radially elastically slidably mounted in the side wall of the bottom end of the core cylinder, all the sliding shafts being arranged in a ring array on the core cylinder, the end of the sliding shaft located outside the core cylinder being used to abut and fix against a large circular hole in the faceplate sheet metal; a transmission rack being vertically fixed on the upper side of the drive handle, and a swing arm being fixed on the lower side; a core column is also vertically elastically slidably mounted inside the drive handle, the bottom end of the core column being located inside the core cylinder, so that when moving downwards, it can push all the sliding shafts to move outwards from the core cylinder to achieve a fixed connection with the faceplate sheet metal.

[0005] The clamping assembly in this invention also includes a clamping component that is synchronously rotated and mounted with the drive handle. The clamping component includes a speed-increasing gear assembly and a pair of clamping plates driven by it that can come into contact with each other. The two clamping plates come together to press the corresponding sidewalls of the two rectangular slots on the sheet metal of the faceplate to grip the sheet metal of the faceplate. At the beginning of operation, the drive handle moves down, and all the sliding shafts move and finally come into contact with the inner sidewall of the large circular hole. During this process, the drive handle must also rotate at an angle so that after the free end of the swing arm slides into the small circular hole on the sheet metal of the faceplate, the drive handle can no longer rotate and at this time the drive handle continues to move vertically downward to drive the speed-increasing gear assembly.

[0006] Furthermore, the sliding shaft also includes an arc-shaped clamping plate fixed to its end and located outside the core cylinder; the outer arc surface of the clamping plate is coaxially fitted with the hole wall of the large circular hole of the sheet metal of the face shell, and the radial extension plate extending radially outward from the top of the clamping plate can be attached to the top surface of the large circular hole to achieve coaxial connection between the drive handle and the large circular hole.

[0007] Furthermore, a tube-shaped transmission tile is fixed to the other end of the sliding shaft. The opposing transmission tiles are connected by an elastic element so that the circular array structure formed by the arc sidewalls of the clamping tiles under normal conditions can enter the large circular hole without contact.

[0008] Furthermore, the elastic element is a spring or an elastic rope, which is arranged in a circular array or staggered with each other in a non-plane manner.

[0009] Furthermore, a truncated cone is coaxially fixed at the bottom end of the core column, with the small end of the truncated cone facing downwards. The core column includes a truncated cone portion located at its bottom end, with the small end of the truncated cone portion facing downwards, so that when the core column moves downwards, its conical surface can be used to push all the sliding shafts to move.

[0010] Furthermore, the top of the truncated cone portion has a guide ring integrally and coaxially. The guide ring is axially slidably installed inside the core cylinder, and when it contacts the sliding shaft, the sliding shaft moves to its limit towards the outside of the core cylinder. A cylindrical spring is coaxially sleeved on the outside of the core column. The two ends of the cylindrical spring are in non-connected contact with at least one of the inner wall of the drive handle and the top surface of the guide ring. The core cylinder also includes an annular portion at its top. Under normal conditions, the cylindrical spring causes the annular portion to be in close coaxial compression contact with the annular stop portion inside the bottom end of the drive handle.

[0011] Furthermore, the swing arm includes an L-shaped main arm and a positioning pin fixed to its free end. When the swing arm rotates synchronously with the drive handle, the positioning pin slides into the small round hole and gets stuck so that the drive handle cannot continue to rotate, but at this time it can be connected to the speed-increasing gear assembly for transmission. The positioning pin is axially elastically slidably installed inside the free end of the main body arm so that the positioning pin can smoothly slide into the small round hole; the end of the positioning pin that contacts the sheet metal of the face shell has a built-in ball, which is used to roll and contact the sheet metal of the face shell.

[0012] Furthermore, the speed-increasing gear assembly includes a large gear and two small gears, with the three gears meshing sequentially. The large gear meshes with a transmission rack on the drive handle that has been rotated into position. Each of the two small gears drives a gear shaft that is rotatably mounted on the mounting bracket to rotate. Each gear shaft has an internally threaded sliding rod that can only slide axially at its end, and the end of the sliding rod is fixed with the clamping plate.

[0013] Furthermore, each gear shaft is rotatably mounted via a rolling bearing mounted on a mounting bracket, and each slide rod is slidably mounted via a sliding bearing mounted on a mounting bracket; the clamping plate is a ﹁-shaped plate structure, which can simultaneously fit tightly against the wall of the rectangular strip hole and one side of the hole end.

[0014] Furthermore, the mounting handle of the mounting bracket is vertically slidably sleeved on the drive handle via a bar key, and is connected to the support plate fixed on the drive handle via a support spring. The support plate is located below the mounting handle so that the drive handle can rotate and move vertically together with the mounting bracket in the initial stage. However, when the swing arm engages with the small round hole, the mounting bracket moves down to contact the end face of the clamping plate and the rectangular strip hole. The continued downward movement of the drive handle will cause it to move downward relative to the mounting bracket, thereby driving the two clamping plates that are now in contact with the end face of the rectangular strip hole to move closer to each other.

[0015] Compared with the prior art, the beneficial effects of the present invention are: the sheet metal hot forming device for mobile phone shell components in the present invention changes the traditional method of gripping sheet metal shells with rubber suction cups. It can use gripping components made of pure metal materials to grip sheet metal shells, which is more suitable for working environments at high temperatures and will not fail due to high temperatures. This allows the excellent process effect of die stamping and forming to be fully utilized.

[0016] Secondly, the thermal shaping device in this invention does not require strict requirements on the surface finish and flatness of the sheet metal shell, making it particularly suitable for shaping deformed sheet metal shells, and the gripping is not affected.

[0017] Furthermore, the gripping component used in this mobile phone front shell assembly sheet metal hot forming device utilizes several existing round holes and rectangular strip holes on the front shell sheet metal for positioning and clamping. This cleverly achieves the positioning and clamping of the gripping component on the front shell sheet metal, improving the accuracy of the clamping action. Specifically, the large round hole is used to position the drive handle. After the drive handle is positioned, the end of the swing arm, which rotates based on its axis, engages with the small round hole to achieve pre-positioning before the clamping action of the gripping component is executed. This accurately achieves the clamping and fixing of the clamping plate on the front shell sheet metal. Under the pressure of the drive handle, the front shell sheet metal is kept in a horizontal position, which promotes more accurate and firm gripping and transfer. Moreover, multiple springs apply force throughout the process, and the contact is not entirely rigid compression, which can prevent the front shell sheet metal from being deformed by excessive compression and clamping.

[0018] Finally, on the one hand, the round holes in this invention are not limited to the round holes described in the specification. Other round holes can also be used for positioning if the hole diameter is appropriate. On the other hand, the sheet metal hot forming device for mobile phone face shell components in this invention can not only be used to heat the face shell sheet metal in the mold base, but also to preheat the face shell sheet metal in batches first, and then directly grab and transfer it to the mold base for extrusion and forming. This makes it easier to design the heating process and its equipment independently, and greatly improves versatility.

[0019] Other functions and features of the present invention will be described in detail in the following embodiments to provide a full understanding of the concept of the present invention and to enable its practical application in production. Attached Figure Description

[0020] Figure 1 This is a schematic diagram showing the disassembly of the front shell sheet metal and the lower mold base in this invention; Figure 2 This is a schematic diagram showing the fit between the sheet metal outer shell and the lower mold base in this invention; Figure 3 A schematic diagram showing the drive handle of the gripping component before it is fixed and positioned to the large circular hole in the sheet metal of the faceplate. Figure 4 A schematic diagram showing the fixed positioning of the drive handle of the gripping component with the large circular hole in the sheet metal of the faceplate. Figure 5 A partial top-view diagram of the component gripping the sheet metal shell; Figure 6 This is a schematic diagram of the swing arm structure; Figure 7 for Figure 5 AA section view in the middle; Figure 8 This is a schematic diagram of a connection structure between the mounting bracket and the drive handle.

[0021] As shown in the figure, the components include: sheet metal faceplate 1, large round hole 101, small round hole 102, rectangular strip hole 103, lower mold base 2, drive handle 3, support plate 301, annular stop part 302, core cylinder 4, circular ring part 401, sliding shaft 5, clamping bearing 6, transmission bearing 7, truncated cone part 8, guide ring 9, core column 10, cylindrical spring 11, swing arm 12, transmission rack 13, clamping plate 14, slide rod 15, gear shaft 16, rolling bearing 17, sliding bearing 18, positioning pin 19, ball bearing 20, mounting bracket 21, mounting handle 2101, support spring 22, speed-increasing gear assembly 23, large gear 2301, small gear 2302, bar key 24, and elastic element 25. Detailed Implementation

[0022] Based on the accompanying drawings and the following description, the technical solutions in the embodiments of the present invention can be clearly and completely described. However, it should be understood that the embodiments mentioned herein are merely one or several specific methods of the present invention, and not all implementation structures or method steps.

[0023] As one of the main structures of the sheet metal thermal shaping device for mobile phone casing components in this invention, such as Figures 1-2As shown, the system specifically includes a lower mold base 2, an upper mold base (not shown in the figure), and a gripping assembly. This gripping assembly includes a clamping component that holds the sheet metal 1 along its plane. The cavity of the lower mold base 2 precisely matches the shape of the sheet metal 1. The upper mold base is correspondingly positioned to the lower mold base 2 and can be closed with the lower mold base 2. Essentially, this is the principle of stamping the sheet metal 1; the already formed sheet metal 1 is then stamped and shaped again. Therefore, the main structure of the lower mold base 2 can utilize the original stamping mold for the sheet metal 1, or be adapted to add a heating function. Unlike stamping molds, the dimensions of the mold base can be appropriately enlarged within permissible limits, and the openings of each forming groove are chamfered to facilitate the smooth and rapid insertion of the sheet metal 1. For example, in this embodiment, the upper mold base and / or lower mold base 2 are heated by electric heating tubes, and the heating temperature is controlled at the temperature required for sheet metal thermal forming, so that when the mold base is closed, it can make thermal contact with the sheet metal to achieve sheet metal thermal forming. One difference from the prior art is that in this embodiment, the heating of the sheet metal shell 1 does not have to be done only when the mold base is in contact, but the sheet metal shell 1 can be preheated first, and the mold base does not need to be heated, because this gripping component can directly contact the sheet metal shell 1 for a long time. In practice, considering the high efficiency and uniformity of thermal forming, the commonly used laser heating technology can also be used. The improvement of the heating device in this embodiment is how to avoid the gripping design of the suction cup gripping the sheet metal shell 1 in the high temperature thermal forming environment, so as to avoid the use of negative pressure adsorption and transfer such as rubber suction cups for this type of thin plate stamping parts. Therefore, the specific heating structure will not be described in detail.

[0024] In this embodiment, the gripping component is made of no rubber material, allowing it to directly contact the high-temperature sheet metal 1 of the outer shell, and can also approach the heated mold base, such as... Figures 3-4As shown, the gripping assembly consists of a drive handle 3 and a core cylinder 4. The drive handle 3 achieves rotation and / or vertical movement through a hydraulic lifting mechanism and a rotating mechanism driven by a motor, specifically, it can move up and down vertically and rotate around its own axis. The top end of the core cylinder 4 is axially slidably mounted inside the bottom end of the drive handle 3, allowing the drive handle 3 to slide axially relative to the core cylinder 4. Several radially penetrating sliding holes are provided on the side wall of the bottom end of the core cylinder 4. A sliding shaft 5 is elastically slidably mounted in each sliding hole through a sliding pair. In this embodiment, there are four or three sliding shafts 5, all of which are evenly distributed in a circular array on the side wall of the core cylinder 4. The end of the sliding shaft 5 located on the outside of the core cylinder 4 is used to abut against the inner wall of the pre-set large circular hole 101 on the sheet metal surface 1 to achieve fixation with the sheet metal surface 1. A transmission rack 13 is vertically fixed on the upper side of the drive handle 3. A swing arm 12 is fixed on the lower side of the drive handle 3 by welding or other means. The drive handle 3 has a vertical mounting hole inside. A core post 10 is slidably mounted in the mounting hole via an elastic element (such as a circular spring in this embodiment). The top end of the core post 10 is slidably mounted inside the drive handle 3, and the bottom end extends into the core cylinder 4. In use, when the core post 10 is subjected to a downward force and moves downward, its bottom end can simultaneously push all the sliding shafts 5 to move radially outward from the core cylinder 4, thereby achieving contact and fixation between the sliding shafts 5 and the large circular hole 101 of the sheet metal 1. In this embodiment, the clamping component and the drive handle 3 are mounted to rotate synchronously. Specifically, they can be linked together or driven independently by an external drive element. However, they must be able to rotate synchronously, that is, ensure that the transmission rack 13 and the large gear 2301 mentioned later are always in a state of vertically relative and can immediately mesh after moving into position. Therefore, they must rotate synchronously to maintain this relative positional relationship. For example, when one motor drives the drive handle 3 to rotate and another motor drives the entire clamping component to rotate around the drive handle 3, their rotation speeds are the same, that is, they rotate synchronously.

[0025] In the above embodiments, such as Figure 5 The specific structure of the clamping components includes: a speed-increasing gear assembly 23 and a pair of clamping plates 14 driven by the speed-increasing gear assembly 23. The two clamping plates 14 can quickly move closer together or separate under the drive of the speed-increasing gear assembly 23. When the two clamping plates 14 move closer together, they can press the corresponding side walls of the two existing rectangular slots 103 on the sheet metal 1. Under the action of the clamping pads 6 mentioned below driven by the sliding shaft 5, a more stable grip on the sheet metal 1 is achieved. For example, in the specific manufacturing process, please refer to the following. Figure 7The clamping plate 14 adopts a ﹁-shaped plate structure, integrally formed from a horizontal section and a vertical section. The horizontal section is used to closely fit the end face of the rectangular slot 103, and the vertical section is used to closely fit the inner side wall of the rectangular slot 103. When the two clamping plates 14 are close together, their horizontal and vertical sections can simultaneously contact the end face and side wall of the rectangular slot 103, increasing the contact area, improving the stability of the clamping, and preventing the sheet metal 1 of the face shell from shifting during the gripping process. In practice, for sheet metal 1 of the face shell with a relatively small thickness, a corresponding accommodating groove can be adapted to be machined on the part of the lower mold base 2 opposite the round hole or rectangular slot 103 as needed, so that the bottom end of the clamping plate 14 or the clamping tile 6 can freely pass through the corresponding round hole or rectangular slot 103 to fully contact the hole wall of the round hole or rectangular slot 103.

[0026] In the above design, such as Figures 3-4 As shown, for the specific design of the sliding shaft 5, a tubular transmission plate 7 can be fixed to the other end of the sliding shaft 5. The transmission plates 7 facing each other are connected by an elastic element 25 such as a spring or elastic rope, so that the circular array structure formed by the arc sidewalls of the clamping plates 6 in normal condition can enter the large circular hole 101 without contact. In specific manufacturing, the elastic element 25 can be as follows: Figure 4 As shown, it is connected between two opposing transmission bearings 7, or as... Figure 3 As shown, the ring array is on the sliding shafts 5 of these transmission tiles 7. The working process of this shaping device is as follows: At the beginning of operation, an external driving mechanism such as a hydraulic rod drives the driving handle 3 to move vertically downward. During this process, the core column 10 moves downward under its own weight and the squeezing action of the elastic element, pushing all the sliding shafts 5 to move outward towards the core cylinder 4, and finally abutting against the inner wall of the large circular hole 101 of the sheet metal 1, thus fixing the driving handle 3 coaxially in the large circular hole 101, realizing its initial positioning and fixation on the sheet metal 1; during this period, the driving handle 3 can rotate as described above while moving downward, or the driving handle 3 can move downward first and then rotate. In either case, as long as the driving handle 3 rotates by a preset angle under the drive of its matching rotating mechanism (for example, in this embodiment, the rotation angle can be set to 25°, i.e., ...), it can be a fixed position. Figure 5The dotted line indicates the initial position of the swing arm 12, causing its free end to slide into the pre-set small round hole 102 on the sheet metal 1. At this time, the swing arm 12 is limited by the small round hole 102, and the drive handle 3 cannot continue to rotate. Since the drive handle 3 and the clamping component do not rotate relative to each other, the swing arm 12 is limited by the small round hole 102, indicating that the clamping component is at the predetermined clamping height. That is, the two clamping plates 14 of the clamping component are respectively located at a certain point on the two rectangular slots 103, and the clamping plates 14 have partially entered the rectangular slots 103: for example, the vertical section of the clamping plate 14 has entered the rectangular slot 103, and / or the horizontal section is attached to the surface of the sheet metal 1. After that, the drive handle 3 continues to move vertically downward. If the clamping plate If the horizontal section of clamping plate 14 is not attached to the surface of sheet metal 1, the clamping component will continue to move downward with the drive handle 3. If it is already attached to the surface of sheet metal 1, when the drive handle 3 and the clamping component are vertically and elastically installed, the corresponding elastic connector will continue to deform adaptively, so that the horizontal section of clamping plate 14 is more reliably attached to sheet metal 1. Furthermore, when the drive handle 3 drives the speed-increasing gear assembly 23 to move, the two clamping plates 14 of the clamping component will move closer together. The two clamping plates 14 will move relatively closer together while attached to the surface of sheet metal 1, and finally press the side wall of the rectangular strip hole 103 of sheet metal 1, or / and the surface of sheet metal 1, to firmly grasp sheet metal 1. Then, sheet metal 1 can be transferred between the lower mold base 2 and the upper mold base for heat forming. In the above design, for the final clamping and fixing method between the clamping plate 14 and the sheet metal 1, it is recommended to use the method of pressing the horizontal plate segment and the vertical plate segment against the top surface and side wall of the rectangular strip hole 103 respectively. This method is the most reliable for thin sheet metal 1. The sheet metal thermal forming device for the mobile phone casing assembly in this embodiment can also refine the structural design of the core pillar 10 and the core cylinder 4, such as... Figure 3As shown, a guide ring 9 is integrally formed coaxially at the top of the truncated cone 8. The outer diameter of the guide ring 9 matches the inner diameter of the core cylinder 4. The guide ring 9 is axially slidably installed inside the core cylinder 4 and can slide freely along the axial direction of the core cylinder 4. When the guide ring 9 moves down with the core column 10 to contact the corresponding end of the sliding shaft 5 (the corresponding end can specifically be the transmission bearing 7 mentioned below), it can limit the sliding shaft 5, allowing the sliding shaft 5 to move to its limit position outward from the core cylinder 4, preventing the sliding shaft 5 from over-extending and damaging the sheet metal 1 of the face shell or its own structure. On the outside of the core column 10, a cylindrical spring 11 is coaxially sleeved. The cylindrical spring 11 is a compression spring, and its elastic coefficient is set according to the force requirements of the core column 10. The top end of the cylindrical spring 11 contacts the inner wall of the drive handle 3, and the bottom end contacts the top surface of the guide ring 9. In its specific manufacturing process, the core cylinder 4 also includes a circular ring 401 located at its top. The circular ring 401 is integrally formed with the core cylinder 4, and its outer diameter is slightly larger than the outer diameter of the main body of the core cylinder 4. Under normal conditions (i.e., when the core column 10 has not moved down), the cylindrical spring 11 is also in a compressed state, applying a downward force to the guide ring 9, thereby... Figure 3 As shown, the annular portion 401 of the core cylinder 4 is coaxially pressed and in close contact with the pre-set annular stop portion 302 inside the bottom end of the drive handle 3, so as to achieve normal positioning between the core cylinder 4 and the drive handle 3 and prevent the core cylinder 4 from sliding randomly. like Figure 6 As shown, this embodiment specifies the structure of the swing arm 12. The swing arm 12 includes an L-shaped main arm and a positioning pin 19. One end of the main arm is fixed to the lower side of the drive handle 3 by welding, and the other end is a free end. The positioning pin 19 is installed inside the free end of the main arm. The positioning pin 19 is elastically slidably installed inside the free end of the main arm by an elastic element (a return spring is used in this embodiment). One end of the return spring is connected to the inner wall of the main arm, and the other end is connected to the positioning pin 19, so that the positioning pin 19 can slide elastically along the axial direction. This facilitates the smooth sliding of the positioning pin 19 into the small round hole 102 of the sheet metal 1 when the drive handle 3 rotates, avoiding jamming. To reduce friction, a ball bearing 20 is installed at the end of the positioning pin 19 that contacts the sheet metal 1. When the swing arm 12 rotates synchronously with the drive handle 3, the ball bearing 20 rolls against the surface of the sheet metal 1, reducing friction and preventing scratches on the surface of the sheet metal 1. At the same time, it facilitates the positioning pin 19 to slide quickly into the small round hole 102. After the positioning pin 19 slides into the small round hole 102, it will be stuck by the side wall of the small round hole 102, preventing the drive handle 3 from continuing to rotate. This ensures that the clamping component reaches the predetermined temporary stopping position. If the drive handle 3 continues to move vertically downward, it will drive the speed-increasing gear assembly 23 to perform the clamping action of the clamping plate 14. This embodiment provides specific definitions for the speed-increasing gear assembly 23, such as... Figure 5As shown, the speed-increasing gear assembly 23 includes a large gear 2301, two small gears 2302, and a mounting bracket 21 to achieve accelerated transmission, allowing the clamping plate 14 to move more rapidly, thereby also shortening the structural dimensions of the transmission rack 13 and its corresponding mounting elements. All three gears are rotatably mounted on an adaptively designed mounting bracket 21 and mesh sequentially. Specifically, the large gear 2301 meshes with one of the small gears 2302, which in turn meshes with the other small gear 2302. The large gear 2301 drives the small gears 2302 to achieve speed-increasing transmission. The large gear 2301 meshes with the transmission rack 13 on the driven handle 3 when it has rotated to its position. When the driven handle 3 rotates to its position and moves downwards, the transmission rack 13 precisely meshes with the large gear 2301, driving the large gear 2301 to rotate, which in turn drives the two small gears 2302 to rotate. Two small gears 2302 are each coaxially fixedly connected to a gear shaft 16, driving the corresponding gear shaft 16 to rotate. The gear shaft 16 is rotatably mounted on the mounting bracket 21. Each gear shaft 16 has an internal thread at its end. A slide rod 15 is threadedly connected to the end of the gear shaft 16. A guide key (not shown in the figure) is provided on the outer side of the slide rod 15. A guide groove is provided on the mounting bracket 21, so that the slide rod 15 can only slide axially and cannot rotate synchronously with the gear shaft 16. A clamping plate 14 is fixed to the end of the slide rod 15 away from the gear shaft 16. When the gear shaft 16 rotates, the slide rod 15 is driven to move axially through the threaded transmission, thereby driving the two clamping plates 14 to move closer or further apart, realizing the pressing or loosening of the rectangular strip hole 103 on the opposite sheet metal 1. More specifically, as Figure 5 Each of the gear shafts 16 is rotatably mounted on the mounting bracket 21 via rolling bearings 17. The rolling bearings 17 are deep groove ball bearings to ensure smooth rotation. Each of the slide rods 15 is slidably mounted on the mounting bracket 21 via sliding bearings 18 to ensure that the slide rods 15 can slide smoothly along the axial direction and avoid jamming. In the above structural design, if the drive handle 3 and the clamping component are linked by the same power element, instead of using two motors or similar drive elements to drive them independently and maintain synchronous rotation as mentioned in the previous embodiments, then as follows: Figure 8 As shown, a mounting handle 2101 is integrally formed on one side of the mounting bracket 21. This mounting handle 2101 has a vertical through hole, and a groove for a key 24 is provided within the through hole. A corresponding key 24 is provided on the outer side of the drive handle 3. The mounting handle 2101 is vertically slidably fitted onto the drive handle 3 through the cooperation of the key 24 and its groove. This allows the mounting bracket 21 to slide vertically relative to the drive handle 3, but it cannot rotate relative to the drive handle 3, achieving synchronous rotation with the drive handle 3. Consequently, the transmission rack 13 and the large gear 2301 can always return to meshing when they have moved to a certain position relatively vertically. (Continue reading...) Figure 8On the drive handle 3, below the mounting handle 2101, a support plate 301 is fixed by welding. The support plate 301 is arranged horizontally. A support spring 22 (i.e. the elastic connector mentioned above) is connected between the bottom of the mounting handle 2101 and the top of the support plate 301. The support spring 22 is sleeved on the outside of the drive handle 3. Therefore, when the mounting handle 2101 is moved, the support spring 22 carries the mounting handle 2101, that is, the clamping component, to rotate together. When moving vertically, it can carry the mounting handle 2101 and its clamping component vertically within the elastic limit. If necessary, it can maintain the contact force between the horizontal section of the clamping plate 14 and the surface of the sheet metal 1, so that the clamping plate 14 can clamp the sheet metal 1 more reliably.

[0027] In practical manufacturing, the drive handle 3 can be mounted on a mounting arm (not shown in the figure) to move the gripping component to the corresponding position. More specifically, a corresponding drive device can be mounted on the mounting arm to drive the drive handle 3 to rotate and move vertically. For example, a hydraulic rod can be connected to the top of the drive handle 3 for vertical movement. The hydraulic rod can be fixed to the main shaft of the motor to realize the rotation of the drive handle 3, thereby realizing the vertical or rotational movement of the entire clamping component. In use, moving the mounting arm moves the gripping component in this heat-forming device, placing the sheet metal 1 onto the heated mold base for heat forming. Specifically, in this embodiment, when the drive handle 3 moves downward in the initial stage, the mounting bracket 21 rotates and moves vertically synchronously with the drive handle 3 under the action of the bar key 24 and the support spring 22. When the positioning pin 19 of the swing arm 12 slides into the small round hole 102 of the faceplate sheet 1 and gets stuck, the drive handle 3 can no longer rotate. The drive handle 3 continues to move vertically downward. At this time, the mounting bracket 21 can continue to move downward until the clamping plate 14 contacts the end face of the rectangular bar hole 103 on the faceplate sheet 1, that is, the horizontal section of the clamping plate 14 is in contact with the surface of the sheet metal. When the drive handle 3 continues to move downward, the drive handle 3 will move downward relative to the mounting bracket 21. The two move relative to each other in the vertical direction, and then the transmission rack 13 drives the large gear 2301 of the speed-increasing gear assembly 23 to start moving. Finally, it drives the two clamping plates 14 to come closer to each other, press the side wall of the rectangular bar hole 103, and complete a more reliable and stable grip on the faceplate sheet 1 while pressing the surface of the faceplate sheet 1 at the same time.

[0028] This invention is not limited to the field covered by this embodiment. Some well-known structures or principles have not been further described. However, those skilled in the art can theoretically know all the well-known technologies in this field prior to the application date or priority date, and can fully master all the prior art in this field. They also have the means and ability to apply these prior art in practical design. Under the technical guidance provided in this application, those skilled in the art can more comprehensively improve and implement this invention by combining their own capabilities. Furthermore, it should be noted that although the text and graphics of the above embodiments have shown specific implementation scenarios of the invention, those skilled in the art can make various obvious extensions and expansions to these embodiments without departing from the design concept of the invention, forming different embodiments. However, this does not affect the fact that the scope of protection of the invention is covered and embodied by the technical features of this claim and equivalent technical features.

Claims

1. A sheet metal hot forming device for a mobile phone front shell assembly, comprising a lower mold base (2) and an upper mold base for fitting with the sheet metal front shell (1), characterized in that, It also includes a gripping component that can move the sheet metal (1) of the face shell (1) into the lower mold base (2) under heating environment. The gripping component includes a drive handle (3) and a core cylinder (4). The drive handle (3) can move vertically and rotate. The top end of the core cylinder (4) is axially slidably installed inside the bottom end of the drive handle (3). Several sliding shafts (5) are radially elastically slidably installed in the side wall of its bottom end. All the sliding shafts (5) are arranged in a ring on the core cylinder (4). One end of the sliding shaft (5) located outside the core cylinder (4) is used to abut and fix the large round hole (101) of the sheet metal (1) of the face shell (1). The drive handle (3) has a transmission rack (13) vertically fixed on the upper side and a swing arm (12) fixed on the lower side; a core column (10) is also vertically and elastically slidably installed inside the drive handle (3), with the bottom end of the core column (10) located inside the core cylinder (4) so ​​that when it moves downward, it can push all the sliding shafts (5) to move outward from the core cylinder (4) to achieve a fixed connection with the sheet metal (1) of the face shell; It also includes a clamping component that is mounted to rotate synchronously with the drive handle (3). The clamping component includes a speed-increasing gear assembly (23) and a pair of clamping plates (14) driven by it that can come into contact with each other. The two clamping plates (14) come into contact with each other and press the corresponding sidewalls of the two rectangular slots (103) on the faceplate sheet metal (1) to grip the faceplate sheet metal (1). At the beginning of operation, the drive handle (3) moves down, and all the sliding shafts (5) move and finally come into contact with the inner wall of the large round hole (101). During this process, the drive handle (3) also needs to rotate at an angle so that the free end of the swing arm (12) slides into the small round hole (102) on the sheet metal (1) of the faceplate. Then the drive handle (3) can no longer rotate and at this time the drive handle (3) continues to move vertically down to drive the speed-increasing gear assembly (23).

2. The sheet metal hot forming device for a mobile phone faceplate assembly according to claim 1, characterized in that, The sliding shaft (5) also includes an arc-shaped clamping plate (6) fixed to its end and located outside the core cylinder (4); the outer arc surface of the clamping plate (6) is coaxially fitted with the hole wall of the large circular hole (101) of the sheet metal shell (1), and the radial extension plate extending radially outward from the top of the clamping plate (6) can be attached to the top surface of the large circular hole (101) to achieve coaxial connection between the drive handle (3) and the large circular hole (101).

3. The sheet metal hot forming device for a mobile phone faceplate assembly according to claim 2, characterized in that, The other end of the sliding shaft (5) is fixed with a tube-shaped transmission tile (7). The transmission tiles (7) facing each other are installed through an elastic element (25) so that the circular array structure formed by the arc sidewalls of the clamping tile (6) under normal conditions can enter the large circular hole (101) without contact.

4. The sheet metal hot forming device for a mobile phone faceplate assembly according to claim 3, characterized in that, The elastic element (25) is a spring, which is arranged in a circular array or staggered with each other in a non-plane manner.

5. The sheet metal hot forming device for a mobile phone faceplate assembly according to claim 1, characterized in that, A truncated cone is coaxially fixed at the bottom end of the core column (10), with the small end of the truncated cone facing downwards. The core column (10) includes a truncated cone portion (8) located at its bottom end, with the small end of the truncated cone portion (8) facing downwards, so that when the core column (10) moves downwards, its conical surface can be used to push all the sliding shafts (5) to move.

6. The sheet metal hot forming device for a mobile phone casing assembly according to claim 5, characterized in that, The top of the truncated cone (8) has a guide ring (9) integrally formed on the same axis. The guide ring (9) is axially slidably installed inside the core cylinder (4). When it contacts the sliding shaft (5), the sliding shaft (5) moves to the limit towards the outside of the core cylinder (4). A cylindrical spring (11) is coaxially sleeved on the outer side of the core (10). The two ends of the cylindrical spring (11) are in non-connected contact with at least one of the inner wall of the drive handle (3) and the top surface of the guide ring (9). The core cylinder (4) also includes a ring portion (401) located at its top end. Under normal conditions, the cylindrical spring (11) causes the ring portion (401) to be in close coaxial compression contact with the annular stop portion (302) inside the bottom end of the drive handle (3).

7. The sheet metal hot forming device for a mobile phone faceplate assembly according to claim 1, characterized in that, The swing arm (12) includes an L-shaped main arm and a positioning pin (19) fixed to its free end. When the swing arm (12) rotates synchronously with the drive handle (3), the positioning pin (19) slides into the small round hole (102) and gets stuck so that the drive handle (3) cannot continue to rotate, but at this time it can be connected to the speed-increasing gear assembly (23) for transmission. The positioning pin (19) is axially elastically slidably installed inside the free end of the main body arm so that the positioning pin (19) can smoothly slide into the small round hole (102); the end of the positioning pin (19) that contacts the sheet metal (1) has a built-in ball (20) for rolling contact with the sheet metal (1).

8. The sheet metal hot forming device for a mobile phone faceplate assembly according to claim 1, characterized in that, The speed-increasing gear assembly (23) includes a large gear (2301) and two small gears (2302). The three gears mesh in sequence. The large gear (2301) meshes with the transmission rack (13) on the drive handle (3) which has been rotated to the position. Each of the two small gears (2302) drives a gear shaft (16) that is rotatably mounted on the mounting bracket (21) to rotate. Each gear shaft (16) has an internal threaded connection at its end with a slide rod (15) that can only slide axially. The end of the slide rod (15) is fixed with the clamping plate (14).

9. The sheet metal hot forming device for a mobile phone faceplate assembly according to claim 8, characterized in that, Each of the gear shafts (16) is rotatably mounted via a rolling bearing (17) mounted on a mounting bracket (21), and each of the slide rods (15) is slidably mounted via a sliding bearing (18) on a mounting bracket (21); the clamping plate (14) is a ﹁-shaped plate structure, so as to be able to simultaneously fit tightly against the hole wall and one side of the hole end of the rectangular strip hole (103).

10. A sheet metal hot forming device for a mobile phone faceplate assembly according to claim 9, characterized in that, The mounting handle (2101) of the mounting bracket (21) is vertically slidably sleeved on the drive handle (3) via a bar key (24), and is connected to the support plate (301) fixed on the drive handle (3) via a support spring (22). The support plate (301) is located below the mounting handle (2101) so that the drive handle (3) can rotate and move vertically together with the mounting bracket (21) in the initial stage. However, when the swing arm (12) engages with the small round hole (102), the mounting bracket (21) moves down to contact the end face of the clamping plate (14) and the rectangular strip hole (103). The continued downward movement of the drive handle (3) will cause it to move downward relative to the mounting bracket (21) to drive the two clamping plates (14) that are now in contact with the end face of the rectangular strip hole (103) to move closer to each other.

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