A hot pressing machine for curved panels of electronic products

Abstract

This utility model provides a hot-press forming machine for curved panels of electronic products, including several sets of hot-pressing devices and cooling and shaping devices distributed in a straight line, as well as forming mold assemblies that move sequentially. Each hot-pressing device includes a lower support base, an upper heating plate assembly, and a first hydraulic drive device for driving the upper heating plate assembly to rise and fall. Some hot-pressing devices are equipped with a vacuum device, which includes an upper sealing cover sealed to the outer periphery of the upper heating plate assembly, a lower sealing cover sealed to the outer periphery of the lower support base, and a vacuum port on either the upper or lower sealing cover. The bottom of the lower sealing cover is supported on the frame by several springs, allowing the lower sealing cover to rise and fall elastically. After closing, a vacuum is drawn, expelling air from the cavity of the forming mold assembly, thus preventing air bubbles from easily forming during the material's flow and shaping process. The multiple sets of hot-pressing devices and cooling and shaping devices not only improve production efficiency but also reduce product stress deformation.

Description

Technical Field

[0001] This utility model relates to the technical field of curved panel hot pressing forming equipment. Background Technology

[0002] With the development of various curved screen or curved back cover mobile phones on the market, corresponding products such as curved screen glass, or curved back covers and curved protective films made of thermoplastic materials such as PC and PET have emerged. These products are all formed by hot pressing sheets using a hot press mold. In the hot pressing process, the product needs to be heated to a certain temperature through the mold to soften it, then shaped by the mold pressure, and then the mold pressure is maintained for a certain period of time to allow it to cool and solidify before finally being opened and removed from the mold.

[0003] On the one hand, during the production process, the blank softens and flows within the mold, undergoing reshaping. Due to the presence of air in the mold cavity, the blank easily traps air during its flow, generating air bubbles. These bubbles are difficult to expel through mold pressure, leading to product defects. On the other hand, the blank needs to be heated to a set stable temperature and held under pressure for a certain period before cooling and solidifying to release stress. This process is relatively lengthy, resulting in low production efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a hot pressing molding equipment with high production efficiency and less susceptibility to bubble defects.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A hot press forming machine for curved panels of electronic products includes a frame, several sets of hot forming devices and several sets of cooling and shaping devices sequentially mounted on the frame along a horizontal straight line, and one or more sets of forming mold assemblies that move between the hot forming devices and the cooling and shaping devices in the processing sequence. Each hot forming device includes a lower support fixed to the frame for supporting and heating the bottom surface of the forming mold assembly, an upper heating plate assembly corresponding to the lower support for applying pressure and heating the top surface of the forming mold assembly, and a first hydraulic drive device for driving the upper heating plate assembly to rise and fall. A vacuum device is provided on some of the hot forming devices. The vacuum device includes an upper sealing cover sealed to the outer periphery of the upper heating plate assembly, a lower sealing cover sealed to the outer periphery of the lower support, and a vacuum port provided on the upper or lower sealing cover. The bottom of the lower sealing cover is supported on the frame by several springs, allowing the lower sealing cover to rise and fall elastically.

[0007] In a preferred embodiment, the first hydraulic drive device includes a cylinder vertically mounted on the frame, the movable end of the cylinder corresponding to the upper heating plate assembly, and two sets of linear cylinders vertically fixed on the frame and disposed on both sides of the cylinder, and a plurality of guide posts corresponding to each linear cylinder and vertically slidably mounted on the frame. The two ends of each set of guide posts are respectively fixedly connected to the movable end of the corresponding linear cylinder and the upper heating plate assembly. During the pressing process, the upper heating plate assembly is first driven down by the linear cylinder to contact the molding die assembly, and then the movable end of the cylinder moves down to contact the upper heating plate assembly and apply pressure.

[0008] In a preferred embodiment, the vacuum device comprises at least two sets.

[0009] In a preferred embodiment, each of the vacuum devices is correspondingly disposed on one of the thermoforming devices at the front end of the processing sequence.

[0010] In a preferred embodiment, the lower sealing cover is a rectangular frame adapted to surround the outer periphery of the lower support base, and a first circumferential sealing ring is embedded between the inner peripheral wall of the rectangular frame of the lower sealing cover and the outer peripheral wall of the lower support base.

[0011] In a preferred embodiment, a second sealing ring is provided between the mating edges of the upper sealing cover and the lower sealing cover.

[0012] In a preferred embodiment, the cooling and shaping device includes a lower cooling plate for supporting and cooling the bottom surface of the molding die assembly, an upper cooling plate corresponding to the lower cooling plate for cooling the top surface of the molding die assembly, and a second hydraulic drive device for driving the upper cooling plate to rise and fall.

[0013] A preferred embodiment further includes a stepper drive device for driving the molding die assembly to move stepwise along the processing sequence. The stepper drive device includes a slide rail arranged along the processing sequence direction, a mounting rod arranged parallel to the slide rail, a mounting seat connected to the mounting rod via a bearing and slidably mounted on the slide rail, a rotary drive assembly for driving the mounting rod to rotate around an axis, a plurality of levers corresponding to the positions on both sides of each of the thermoforming devices and the cooling and shaping devices and fixed vertically to the mounting rod, and a stepper motor drive device for driving the mounting rod and the rotary drive assembly to move stepwise back and forth along the processing position distribution direction.

[0014] The beneficial effects of this utility model are as follows: A vacuum device is installed on some thermoforming equipment. When the molding die assembly enters the station, the first hydraulic drive device drives the upper heating plate assembly to press down. At this time, the upper sealing cover presses down synchronously until it seals with the lower sealing cover. Then, a vacuum is drawn to expel the air from the cavity of the molding die assembly, thus preventing air bubbles from easily forming during the material flow and shaping process. The lower sealing cover can be elastically raised and lowered by spring support, avoiding impact or sealing failure caused by stroke errors during pressing. Furthermore, by setting up multiple sets of thermoforming and cooling / settling devices, the heating / settling and cooling / settling processes are separated and carried out at multiple stations. After continuous production, this not only greatly shortens the product molding cycle and improves production efficiency, but also gradually releases product stress, reducing product deformation defects. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is an overall structural diagram of the hot press molding machine in the embodiment;

[0017] Figure 2 This is a schematic diagram of the thermoforming device with a vacuum device in the embodiment;

[0018] Figure 3 This is a schematic cross-sectional view of the installation structure of the lower support base and the lower sealing cover in the embodiment;

[0019] Figure 4 This is a schematic diagram of the cooling and shaping device in the embodiment;

[0020] Figure 5 This is a schematic diagram of the stepper drive device in the embodiment. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] It should be noted that the terms indicating orientation in this application document, such as top surface, bottom surface, vertical direction, etc., are only for the purpose of providing a more intuitive description of the structure in conjunction with the accompanying drawings, and are not intended to limit the product structure.

[0023] refer to Figures 1 to 5As shown, a hot pressing machine for curved panels of electronic products includes a frame 1, eight sets of hot forming devices 2 and two sets of cooling and shaping devices 3 sequentially mounted on the frame 1 along a horizontal straight line, and one or more sets of forming mold assemblies 4 that move between the hot forming devices 2 and the cooling and shaping devices 3 in the processing sequence; each hot forming device 2 includes a lower support base 21 fixed on the frame 1 for supporting and heating the bottom surface of the forming mold assembly 4, and an upper heating plate assembly corresponding to the lower support base 21 for applying pressure and heating the top surface of the forming mold assembly 4. 22, and a first hydraulic drive device 23 for driving the upper heating plate assembly 22 to rise and fall; wherein, a portion of the thermoforming device 2 is provided with a vacuum device 5, the vacuum device 5 including an upper sealing cover 51 sealed to the outer periphery of the upper heating plate assembly 22, a lower sealing cover 52 sealed to the outer periphery of the lower support base 21, and a vacuum port provided on the upper sealing cover 51 or the lower sealing cover 52, and the bottom of the lower sealing cover 52 is supported on the frame 1 by a plurality of springs 521, so that the lower sealing cover 52 can be elastically raised and lowered.

[0024] During production, the sheet blank is placed into the cavity of the molding die assembly 4, and the molding die assembly 4 is moved between the various thermoforming devices 2 and cooling and shaping devices 3 along the processing sequence. Vacuum devices 5 are installed on some thermoforming devices 2. When the molding die assembly 4 enters the station, the first hydraulic drive device 23 drives the upper heating plate assembly 22 to press down. At this time, the upper sealing cover 51 is pressed down synchronously to seal with the lower sealing cover 52. Then, a vacuum is drawn to expel the air in the cavity of the molding die assembly 4, so that air bubbles are less likely to be generated during the blank flow and shaping process. The lower sealing cover 52 can be elastically raised and lowered by the support of the spring 521, which can avoid impact or failure to seal due to stroke error during pressing. By setting up multiple sets of thermoforming devices 2 and cooling and shaping devices 3, the heating and shaping process and the cooling and shaping process are carried out separately in multiple stations. After continuous production, not only is the product molding cycle greatly shortened and the production efficiency improved, but the product stress is also gradually released, which can reduce product deformation defects.

[0025] In a preferred embodiment, the first hydraulic drive device 23 includes a cylinder 231 vertically mounted on the frame 1, with the movable end 2311 of the cylinder 231 corresponding to the upper heating plate assembly 22. It also includes two sets of linear cylinders 232 vertically fixed to the frame 1 and distributed on both sides of the cylinder 231, and several guide posts 233 corresponding to each linear cylinder 232 and vertically slidably mounted on the frame 1. The two ends of each set of guide posts 233 are respectively fixedly connected to the movable end of the corresponding linear cylinder 232 and the upper heating plate assembly 22. During the pressing process, the upper heating plate assembly 22 is first driven down by the linear cylinders 232 to contact the molding die assembly 4, and then the movable end 2311 of the cylinder 231 descends to contact the upper heating plate assembly 22 and applies pressure. First, the upper heating plate assembly 22 is smoothly driven down to contact the molding mold assembly 4 by two sets of linear cylinders 232, and then the oil cylinder 231 applies downward pressure; not only can the molding pressure be guaranteed by the oil cylinder 231, but it can also avoid damage to the molding mold assembly 4 by excessive pressure from the oil cylinder 231 when it is uneven.

[0026] In a preferred embodiment, there are at least two sets of vacuum devices 5. Furthermore, each vacuum device 5 is correspondingly disposed on one of the several thermoforming devices 2 at the beginning of the processing sequence, starting from the first thermoforming device 2. By disposing of the vacuum devices 5 on the several thermoforming devices 2 at the beginning, the blank is placed in a vacuum environment during the initial stage of flow molding, thereby preventing air bubbles from being trapped within the blank and difficult to expel.

[0027] In a preferred embodiment, the lower sealing cover 52 is a rectangular frame adapted to surround the outer periphery of the lower support base 21, and a circumferential first sealing ring 522 is embedded between the inner peripheral wall of the rectangular cover 52 and the outer peripheral wall of the lower support base 21. The first sealing ring 522 ensures the sealing between the relatively sliding lower sealing cover 52 and the lower support base 21.

[0028] In a preferred embodiment, a second sealing ring 523 is provided between the mating edges of the upper sealing cover 51 and the lower sealing cover 52. This ensures a sealed box when the upper sealing cover 51 and the lower sealing cover 52 are closed.

[0029] In a preferred embodiment, the cooling and shaping device 3 includes a lower cooling plate 31 for supporting and cooling the bottom surface of the molding die assembly 4, an upper cooling plate 32 above the lower cooling plate 31 for cooling the top surface of the molding die assembly 4, and a second hydraulic drive device 33 for driving the upper cooling plate 32 to rise and fall. The upper cooling plate 32 and the lower cooling plate 31 can accelerate the cooling and shaping of the blank, thereby improving production efficiency.

[0030] In a preferred embodiment, the hot press molding machine further includes a stepper drive device 6 for moving the molding die assembly 4 stepwise along the processing sequence. The stepper drive device 6 includes a slide rail 61 arranged along the processing sequence direction, a mounting rod 62 arranged parallel to the slide rail 61, a mounting seat 63 connected to the mounting rod 62 by a bearing and slidably mounted on the slide rail 61, a rotary drive assembly 64 for driving the mounting rod 62 to rotate around an axis, a plurality of levers 65 corresponding to the positions on both sides of each of the hot forming devices 2 and the cooling and shaping devices 3 and fixed vertically to the mounting rod 62, and a stepper motor drive device 66 for driving the mounting rod 62 and the rotary drive assembly 64 to move back and forth stepwise along the processing position distribution direction. During operation, the rotary drive assembly 64 drives the mounting rod 62 to rotate around its axis, thereby pressing each lever 65 down to its horizontal position between its respective workstations. Then, the stepper motor drive device 66 drives the mounting rod 62 to translate one workstation along the vertical processing direction, moving the molding die assembly 4 forward one workstation. Next, the rotary drive assembly 64 drives the mounting rod 62 to rotate in the opposite direction, raising each lever 65 to the vertical position. Finally, the stepper motor drive device 66 drives the mounting rod 62 to retract one workstation, completing one translation cycle. The rotary drive assembly 64 includes a cylinder 641 and a connecting rod 642 hinged to the movable rod of the cylinder 641. The connecting rod 642 is vertically fixed to the mounting rod 62. In other embodiments, the rotary drive assembly 64 can also be implemented using a motor and gear assembly. In other embodiments, the stepper drive device 6 can also be implemented using a robotic arm or other methods.

[0031] The above description does not limit the technical scope of this utility model. Any modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. A hot pressing machine for curved panels of electronic products, characterized in that: The system includes a frame, several sets of thermoforming devices and several sets of cooling and shaping devices sequentially mounted on the frame along a horizontal straight line, and one or more sets of forming mold assemblies that move between the thermoforming devices and the cooling and shaping devices in the processing sequence. Each thermoforming device includes a lower support fixed to the frame for supporting and heating the bottom surface of the forming mold assembly, an upper heating plate assembly corresponding to the lower support for applying pressure and heating the top surface of the forming mold assembly, and a first hydraulic drive device for driving the upper heating plate assembly to rise and fall. Some of the thermoforming devices are equipped with a vacuum device, which includes an upper sealing cover sealed to the outer periphery of the upper heating plate assembly, a lower sealing cover sealed to the outer periphery of the lower support, and a vacuum port provided on the upper or lower sealing cover. The bottom of the lower sealing cover is supported on the frame by several springs, allowing the lower sealing cover to rise and fall elastically.

2. The electronic product curved panel hot pressing forming machine according to claim 1, characterized in that: The first hydraulic drive device includes a cylinder vertically mounted on the frame, with the movable end of the cylinder corresponding to the upper heating plate assembly. It also includes two sets of linear cylinders vertically fixed on the frame and distributed on both sides of the cylinder, and several guide posts corresponding to each linear cylinder and vertically slidably mounted on the frame. The two ends of each set of guide posts are fixedly connected to the movable end of the corresponding linear cylinder and the upper heating plate assembly, respectively. During the pressing process, the upper heating plate assembly is first driven down by the linear cylinder to contact the molding die assembly, and then the movable end of the cylinder moves down to contact the upper heating plate assembly and apply pressure.

3. The electronic product curved panel hot pressing forming machine according to claim 1, characterized in that: The vacuum device shall be no less than two sets.

4. The hot pressing machine for curved panels of electronic products according to claim 3, characterized in that: Each of the vacuum devices is correspondingly disposed on one of the thermoforming devices at the front end of the processing sequence.

5. The hot pressing machine for curved panels of electronic products according to claim 1, characterized in that: The lower sealing cover is a square frame adapted to surround the outer periphery of the lower support base, and a first sealing ring is embedded between the inner peripheral wall of the square frame of the lower sealing cover and the outer peripheral wall of the lower support base.

6. The hot pressing machine for curved panels of electronic products according to claim 5, characterized in that: A second sealing ring is provided between the joint edge of the upper sealing cover and the lower sealing cover.

7. The hot pressing machine for curved panels of electronic products according to claim 1, characterized in that: The cooling and shaping device includes a lower cooling plate for supporting and cooling the bottom surface of the molding die assembly, an upper cooling plate above the lower cooling plate for cooling the top surface of the molding die assembly, and a second hydraulic drive device for driving the upper cooling plate to rise and fall.

8. The hot pressing machine for curved panels of electronic products according to claim 1, characterized in that: It also includes a stepper drive device for pushing the molding die assembly to move step by step along the processing sequence. The stepper drive device includes a slide rail arranged along the processing sequence direction, a mounting rod arranged parallel to the slide rail, a mounting seat connected to the mounting rod through a bearing and slidably mounted on the slide rail, a rotary drive assembly for driving the mounting rod to rotate around an axis, a plurality of levers corresponding to the positions on both sides of each of the thermoforming device and the cooling and shaping device and fixed vertically to the mounting rod, and a stepper motor drive device for driving the mounting rod and the rotary drive assembly to move step by step back and forth along the processing position distribution direction.

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