Shell hot-pressing demolding jig

Abstract

The utility model discloses a shell hot-pressing demolding jig, which comprises a first jig, a mold core and a second jig, the first jig, the mold core and the second jig jointly enclose to form a cavity for hot-pressing to form a shell, the mold core comprises a core body and a rubber sleeve coated outside the core body, and the rubber sleeve is sleeved outside the core body. The rubber sleeve is matched with the shell in shape so that materials can be wrapped on the outer wall of the rubber sleeve to form the shell, and the core body is used for supporting the rubber sleeve from inside to outside. Through the unique structural design of the mold core and the rubber sleeve, product scratches and mold damage possibly caused by a traditional forced demolding mode are avoided, meanwhile, the forming defects caused by improper disassembly and assembly of the mold core are reduced, and the production efficiency and the product quality are remarkably improved. In addition, according to the jig, abrasion of the die is reduced, the service life of the die is prolonged, and the production cost is reduced. The design of the mold core and the rubber sleeve is convenient to operate and compatible with external hot pressing equipment, and automatic production is convenient to achieve.

Description

Technical Field

[0001] This utility model relates to the field of mobile phone accessories technology, and in particular to a hot-pressing demolding fixture for a housing. Background Technology

[0002] Mobile phone cases are often manufactured using thermoforming, and their designs typically include complex structures such as curved inverted grooves and button holes to house function buttons like the lock screen and volume control. While this design enhances the functionality and aesthetics of the case, it also presents challenges for demolding. Currently, soft mobile phone cases are mostly produced using a single-piece mold core for thermoforming. However, after molding, the mold core is difficult to remove smoothly from the inverted shell. To solve this problem, existing technologies usually employ mold core disassembly or forced demolding. The molds are mostly steel or aluminum molds. However, for carbon fiber cases, the hardness after curing is extremely high, even exceeding that of mold steel. Traditional forced demolding methods are not only unsuitable but also easily lead to mold damage or scratches on the product surface, and cannot meet the requirement of seamless demolding. Secondly, the assembly and disassembly process of segmented mold cores is cumbersome, increasing operation time and easily leading to molding defects due to improper assembly. In addition, the maintenance of segmented mold cores is also complex; if a component is damaged, more time and effort are required for repair or replacement. Utility Model Content

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a hot-press demolding fixture for shells, which can achieve efficient and non-destructive demolding, while reducing mold wear, simplifying the operation process, improving production efficiency and product quality, and is especially suitable for the production of shells made of high-hardness materials.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: providing a hot-pressing demolding fixture for hot-pressing shells, including a first fixture, a mold core, and a second fixture capable of pressing the mold core onto one side of the first fixture. The first fixture, the mold core, and the second fixture together form a cavity for hot-pressing the shell. The mold core includes a core body and a rubber sleeve covering the outside of the core body. The rubber sleeve matches the shape of the shell so that the material is wrapped around the outer wall of the rubber sleeve to form the shell. The core body is used to support the rubber sleeve from the inside out. The core body is connected to the second fixture and extends into or moves out of the rubber sleeve as the second fixture moves. After the shell is hot-pressed, the second fixture drives the core body to separate from the rubber sleeve and move away from the first fixture, removing the shell and the rubber sleeve as a whole from the cavity, and then separating the shell and the rubber sleeve to complete the demolding.

[0005] Furthermore, the first fixture has a cavity that matches the housing on the side facing the second fixture. The size of the mold core is smaller than the cavity. When the second fixture presses the mold core into the cavity, a gap is formed between the mold core and the cavity wall to heat-press the material to form the housing.

[0006] Furthermore, the cavity includes a molding cavity for molding the housing and a guide cavity for guiding the mold core into the molding cavity. The guide cavity is formed by recessing the first fixture from the side near the second fixture to the side away from the second fixture. The molding cavity is formed at the end of the guide cavity away from the second fixture and communicates with the guide cavity. The sleeve includes a first sleeve that matches the molding cavity and a second sleeve that extends from the first sleeve to the side away from the molding cavity. The outer wall of the second sleeve contacts the inner wall of the guide cavity.

[0007] Furthermore, the housing includes a bottom wall and a side wall circumferentially disposed around the bottom wall. The end face of the side wall extends from the outside to the inside in a direction away from the bottom wall to form an inwardly curved surface. The molding cavity matches the housing, and the inner diameter of the guide cavity matches the inner diameter of the end of the molding cavity away from the bottom wall.

[0008] Furthermore, the molding cavity includes a first cavity that matches the bottom wall and the side wall, and a second cavity that matches the inner curved surface. The first fixture includes a boss and a limiting plate located on the side of the boss facing the second fixture. The first cavity is recessed on the side of the boss facing the limiting plate. The second cavity is opened on the side of the limiting plate facing the boss. The guide cavity is opened on the side of the limiting plate away from the boss and communicates with the second cavity. The width of the core is smaller than the width of the guide cavity so that it can be dislodged from the guide cavity. The width of the rubber sleeve is larger than the width of the guide cavity.

[0009] Furthermore, the core includes a first part and a second part coaxially connected. The first part is connected to the second fixture, and the second part is located on the side of the first part away from the second fixture. The cross-section of the second part is smaller than that of the first part to facilitate insertion into or removal from the rubber sleeve.

[0010] Furthermore, the outer diameter of the first component gradually decreases from near the second fixture to far away from the second fixture to form a platform shape.

[0011] Furthermore, the second fixture has a through groove in the middle, and a connecting block for connecting the first part is detachably connected in the through groove. The connecting block near the wall of the first fixture and the inner peripheral wall of the through groove together form an inner groove for accommodating the core.

[0012] Furthermore, it also includes a lower template for supporting the first fixture and an upper template for engaging or disengaging the second fixture from the first fixture. The first fixture is detachably connected to the lower template, and the second fixture is detachably connected to the upper template.

[0013] Furthermore, a positioning hole is provided between the lower template of the hot press table and the first fixture, and a positioning bolt is inserted into the positioning hole to limit the first fixture to the lower template of the hot press table; a screw hole is provided between the upper template of the hot press table and the second fixture, and a bolt is screwed into the screw hole to fix the second fixture to the upper template of the hot press table.

[0014] This utility model's shell hot-press demolding fixture has at least the following beneficial effects: Through its unique mold core and rubber sleeve structure design, it avoids product scratches and mold damage that may result from traditional forced demolding methods, while also reducing molding defects caused by improper mold core disassembly and assembly, significantly improving production efficiency and product quality. Secondly, this fixture is particularly suitable for producing shells from high-hardness materials, such as carbon fiber. Addressing the problem of difficult demolding after curing of such materials, this fixture can meet the requirement of traceless demolding, effectively solving the difficulties of traditional molds in molding high-hardness materials. Furthermore, by reducing mold wear, this fixture extends the mold's service life and reduces production costs. Its mold core and rubber sleeve design not only facilitates operation but also ensures compatibility with external hot-pressing equipment, facilitating automated production. The split structure and gradually decreasing outer diameter design of the mold core further simplify the operation process and reduce operational difficulty. Meanwhile, the detachable design of the fixture allows for flexible adjustment and replacement of the lower and upper templates of the hot press table according to different production needs. In summary, the shell hot press demolding fixture of this utility model has significant improvements and innovations in terms of improving production efficiency, protecting molds, reducing molding defects, and adapting to high-hardness materials. It can effectively improve product quality and production efficiency, and has broad application prospects and important practical value. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the shell hot-press demolding fixture of this utility model;

[0017] Figure 2 This is an exploded view of an embodiment of the shell hot-pressing demolding fixture of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the first fixture and the template under the hot press table in one embodiment of the shell hot press demolding fixture of this utility model;

[0019] Figure 4 This is a schematic diagram of the boss structure in one embodiment of the shell hot-pressing demolding fixture of this utility model;

[0020] Figure 5 This is a schematic diagram of the limiting plate in one embodiment of the shell hot-press demolding fixture of this utility model;

[0021] Figure 6 This is an exploded view of the mold core structure in one embodiment of the shell hot-press demolding fixture of this utility model;

[0022] Figure 7 This is a cross-sectional structural schematic diagram of an embodiment of the shell hot-press demolding fixture of this utility model;

[0023] Figure 8 This is a schematic diagram of the structure of the second fixture in one embodiment of the shell hot-pressing demolding fixture of this utility model.

[0024] The meanings of the labels in the attached diagram are as follows:

[0025] First fixture 1, boss 11, limiting plate 12, cavity 13, first cavity 131, second cavity 132, guide cavity 133, first positioning bolt 14, first positioning hole 15, mold core 2, core 21, first split 211, second split 212, rubber sleeve 22, first sleeve 221, second sleeve 222, second fixture 3, through groove 31, connecting block 32, limiting groove 33, limiting block 34, first bolt 35, inner groove 36, first screw hole 37, shell 4, bottom wall 41, side wall 42, inner curved surface 43, excess material 44, lower template of hot press table 5, second positioning hole 51, second positioning bolt 52, upper template of hot press table 6, second screw hole 61, second bolt 62. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] Please refer to Figure 1 and Figure 2The hot-pressing demolding fixture of this utility model includes a first fixture 1, a mold core 2, and a second fixture 3 capable of pressing the mold core 2 onto one side of the first fixture 1. The first fixture 1, the mold core 2, and the second fixture 3 together enclose a cavity for hot-pressing to form a shell 4. In this embodiment, the first fixture 1 is below, and the second fixture 3 is above, pressing downward against the first fixture 1. In other embodiments, the positions of the first fixture 1 and the second fixture 3 can be changed, as long as the first fixture 1, the mold core 2, and the second fixture 3 can press against each other to form a cavity, thereby hot-pressing to form the shell 4.

[0028] To clearly describe the structure of the hot-press demolding fixture for the housing 4, the external shape of the housing 4 is described first. The housing 4 is a mobile phone case. Specifically, the housing 4 includes a bottom wall 41 and a side wall 42 surrounding the outer periphery of the bottom wall 41. The end face of the side wall 42 extends from the outside to the inside in a direction away from the bottom wall 41 to form an inwardly curved surface 43.

[0029] Please refer to Figure 3 and Figure 4The first fixture 1 includes a boss 11 and a limiting plate 12 located on the side of the boss 11 facing the second fixture 3 (i.e., the upper end face of the boss 11 in this embodiment). The boss 11 and the limiting plate 12 together have a cavity 13 that matches the housing 4. Each of the four ends of the boss 11 has a first positioning bolt 14 protruding upwards. The limiting plate 12 has a first positioning hole 15 corresponding to the four first positioning bolts 14, which vertically penetrates the limiting plate 12. When the first positioning bolt 14 passes through the first positioning hole 15, the limiting plate 12 is limited to the boss 11. The cavity 13 is formed by a downward recess from the upper end face of the limiting plate 12, and the cavity 13 penetrates the limiting plate 12 and extends into the boss 11. Specifically, the cavity 13 includes a molding cavity for molding the housing 4 and a guide cavity 133 for guiding the mold core 2 into the molding cavity. The guide cavity 133 is formed on the limiting plate 12 and is recessed downward from the upper end of the limiting plate 12, and the guide cavity 133 does not penetrate downward through the limiting plate 12. The molding cavity is formed at the lower end of the guide cavity 133 and communicates with the guide cavity 133. The molding cavity includes a first cavity 131 that matches the bottom wall 41 and the side wall 42 and a second cavity 132 that matches the inner curved surface 43. The first cavity 131 is recessed on the side of the boss 11 facing the limiting plate 12, that is, the first cavity 131 is formed by the lower end of the boss 11 being recessed upward. The second cavity 132 is formed on the side of the limiting plate 12 facing the boss 11 and is recessed upward from the lower end of the limiting plate 12. To match the inner curved surface 43, the inner diameter of the second cavity 132 has a structure that is larger at the bottom and smaller at the top. The lower dimension of the second cavity 132 matches the dimension of the first cavity 131 so that they can fit together. The upper end of the second cavity 132 communicates with the guide cavity 133 and matches the inner diameter of the guide cavity 133.

[0030] Please refer to Figure 5 and Figure 6The mold core 2 includes a core body 21 and a rubber sleeve 22 covering the outside of the core body 21. The rubber sleeve 22 is shaped to match the shell 4 so that material is wrapped around the outer wall of the rubber sleeve 22 to form the shell 4. The core body 21 is used to support the rubber sleeve 22 from the inside out. Specifically, the rubber sleeve 22 includes a first sleeve 221 that matches the molding cavity and a second sleeve 222 that matches the guide cavity 133. The second sleeve 222 is formed by extending upward from the upper end surface of the first sleeve 221. The first sleeve 221 and the second sleeve 222 have core grooves that match the core body 21 for insertion into the core body 21. The core body 21 includes a first part 211 and a second part 212 coaxially connected. The first part 211 is connected to the second fixture 3 and moves with the movement of the second fixture 3. The second part 212 is fixedly disposed on the lower end face of the first part 211, and the cross-sectional size of the second part 212 is smaller than that of the first part 211, so that the core 21 can easily extend into or retract from the rubber sleeve 22. To further facilitate the entry and exit of the core 21 from the rubber sleeve 22, the outer diameter of the first part 211 gradually decreases from near the second fixture 3 to far away from the second fixture 3 (i.e., from top to bottom), thus forming a platform shape. In this way, the first part 211 can more easily enter the core groove without pressing down and bending the upper edge of the rubber sleeve 22. The maximum outer diameter of the core 21 is smaller than the inner diameter of the guide cavity 133 so that it can extend into or retract from the guide cavity 133, while the width of the rubber sleeve 22 is greater than the width of the guide cavity 133 to match the shape of the housing 4. Since the rubber sleeve 22 is made of rubber and can deform, it can be easily removed from the cavity 13.

[0031] Please refer to Figure 7 and Figure 8The second fixture 3 has a vertically penetrating groove 31 in its middle, and a connecting block 32 for connecting the first split body 211 is detachably connected within the groove 31. A limiting groove 33 is formed on the second fixture 3 at a position corresponding to one side of the groove 31. The limiting groove 33 is recessed downwards from the upper end face of the second fixture 3 and does not penetrate through the second fixture 3. A limiting block 34, matching the limiting groove 33, protrudes from the upper end face of the connecting block 32 at a position corresponding to the limiting groove 33. When the connecting block 32 is located in the groove 31 and the limiting block 34 is located in the limiting groove 33, the upper end face of the connecting block 32 is not higher than the upper end face of the second fixture 3, and the connecting block 32 will not move downwards under the limiting action of the limiting block 34. Simultaneously, the lower end face of the connecting block 32 is higher than the lower end face of the second fixture 3. The core 21 is mounted on the lower end face of the connecting block 32. Specifically, the connecting block 32 and the core 21 share a first screw hole 37. The first screw hole 37 vertically penetrates the connecting block 32 and extends downward into the core 21. A first bolt 35 is screwed into the first screw hole 37, and the first bolt 35 screws the core 21 and the connecting block 32 together. The lower end face of the connecting block 32 and the inner peripheral wall of the through groove 31 together form an inner groove 36 for accommodating the core 21. When the rubber sleeve 22 is confined within the cavity 13 and the upper end of the rubber sleeve 22 extends upward into the cavity 13, and the second fixture 3 drives the mold core 2 into the core groove, the upper end of the rubber sleeve 22 is located within the inner groove 36. This not only allows the rubber sleeve 22 to better cover the core 21, but also makes the positioning of the rubber sleeve 22, the first fixture 1, and the second fixture 3 more stable.

[0032] The hot-press demolding fixture of the housing 4 also includes a lower hot-press template 5 for supporting the first fixture 1 and an upper hot-press template 6 for engaging or disengaging the second fixture 3 from the first fixture 1. Both the upper hot-press template 6 and the lower hot-press template 5 are connected to external hot-pressing equipment (not shown in the figure). A second positioning hole 51 is provided between the lower hot-press template 5 and the boss 11. The second positioning hole 51 vertically penetrates the lower hot-press template 5 and extends upward into the boss 11. A second positioning bolt 52 is inserted from bottom to top in the second positioning hole 51 to limit the boss 11 to the lower hot-press template 5. A second screw hole 61 is provided between the upper hot-press template 6 and the second fixture 3. The second screw hole 61 vertically penetrates the upper hot-press template 6 and extends downward into the second fixture 3. A second bolt 62 is screwed from top to bottom in the second screw hole 61 to fix the second fixture 3 to the upper hot-press template 6.

[0033] One embodiment of the hot-press demolding fixture for the housing 4 of this utility model operates as follows: First, the first fixture 1 is positioned on the lower template 5 of the hot press platform. The connecting block 32 is placed in the through groove 31. Then, the core 21 is fixed to the connecting block 32. Finally, the second fixture 3 and the core 21 are jointly fixed to the upper template 6 of the hot press platform. After the device is assembled, the hot-pressing process of the housing 4 can begin.

[0034] During hot pressing, the carbon fiber pre-compressed sheet is first placed into the cavity 13, and then the rubber sleeve 22 is placed inside the cavity 13 to press the carbon fiber pre-compressed sheet into the cavity 13. Because the temperature of the device is high during hot pressing, the silicone rubber sleeve 22 will experience thermal expansion and contraction; the size of the cavity 13 is designed to account for this. When the rubber sleeve 22 is placed into the cavity 13, it does not expand due to heat; therefore, the thickness of the carbon fiber pre-compressed sheet that is not hot-pressed into the housing 4 does not affect the placement of the rubber sleeve 22.

[0035] After placement, the template 6 on the hot press table moves the core 21 down to extend into the core groove of the rubber sleeve 22. At this time, a gap is formed between the mold core 2 and the cavity wall of the cavity 13 to hot press the carbon fiber pre-compressed sheet to form the shell 4.

[0036] During demolding, the template 6 on the hot press platform is first moved upward, causing the core 21 to move upward and remove the rubber sleeve 22. The rubber sleeve 22 remains in the cavity 13 under the limitation of the limiting plate 12. Then, the limiting plate 12 is removed, and the rubber sleeve 22 and the formed mobile phone case are removed from the boss 11. Finally, the mobile phone case and the rubber sleeve 22 are separated to complete the demolding. It should be emphasized that, under the limiting action of the guide cavity 133, the finished shell 4 also includes an annular excess material 44 formed on the upper end of the inner curved surface 43. The excess material 44 is removed in subsequent processing steps.

[0037] Compared with existing technologies, this utility model's shell hot-press demolding fixture, through its unique mold core and rubber sleeve structure design, avoids product scratches and mold damage that may be caused by traditional forced demolding methods. It also reduces molding defects caused by improper mold core disassembly and assembly, significantly improving production efficiency and product quality. Secondly, this fixture is particularly suitable for producing shells from high-hardness materials, such as carbon fiber. Addressing the difficulty of demolding these materials after curing, this fixture meets the requirement of traceless demolding, effectively solving the problem of traditional molds in molding high-hardness materials. Furthermore, by reducing mold wear, this fixture extends mold life and lowers production costs. Its mold core and rubber sleeve design not only facilitates operation but also ensures compatibility with external hot-pressing equipment, enabling automated production. The split structure and gradually decreasing outer diameter design of the mold core further simplify the operation process and reduce operational difficulty. Meanwhile, the detachable design of the fixture allows for flexible adjustment and replacement of the lower and upper templates of the hot press table according to different production needs. In summary, the shell hot press demolding fixture of this utility model has significant improvements and innovations in terms of improving production efficiency, protecting molds, reducing molding defects, and adapting to high-hardness materials. It can effectively improve product quality and production efficiency, and has broad application prospects and important practical value.

Claims

1. A hot-press demolding jig for a housing, for hot-press processing a housing, characterized by: The device includes a first fixture, a mold core, and a second fixture capable of pressing the mold core onto one side of the first fixture. The first fixture, the mold core, and the second fixture together enclose a cavity for hot-pressing to form a shell. The mold core includes a core body and a rubber sleeve covering the outside of the core body. The rubber sleeve matches the shape of the shell so that the material wraps around the outer wall of the rubber sleeve to form the shell. The core body is used to support the rubber sleeve from the inside out. The core body is connected to the second fixture and extends into or out of the rubber sleeve as the second fixture moves. After the shell is hot-pressed, the second fixture drives the core body to separate from the rubber sleeve and move away from the first fixture. The shell and the rubber sleeve are removed from the cavity as a whole, and then the shell and the rubber sleeve are separated to complete the demolding.

2. The shell thermal press demolding fixture of claim 1, wherein: The first fixture has a cavity that matches the housing on one side facing the second fixture. The size of the mold core is smaller than the cavity. When the second fixture presses the mold core into the cavity, a gap is formed between the mold core and the cavity wall to heat-press the material to form the housing.

3. The shell thermal press demolding fixture of claim 2, wherein: The cavity includes a molding cavity for molding the housing and a guide cavity for guiding the mold core into the molding cavity. The guide cavity is formed by recessing the first fixture from the side near the second fixture to the side away from the second fixture. The molding cavity is formed at the end of the guide cavity away from the second fixture and communicates with the guide cavity. The sleeve includes a first sleeve that matches the molding cavity and a second sleeve that extends from the first sleeve to the side away from the molding cavity. The outer wall of the second sleeve contacts the inner wall of the guide cavity.

4. The shell thermal press demolding fixture of claim 3, wherein: The housing includes a bottom wall and a side wall circumferentially disposed around the bottom wall. The end face of the side wall extends from the outside to the inside in a direction away from the bottom wall to form an inwardly curved surface. The molding cavity matches the housing, and the inner diameter of the guide cavity matches the inner diameter of the end of the molding cavity away from the bottom wall.

5. The shell thermal press demolding fixture of claim 4, wherein: The molding cavity includes a first cavity that matches the bottom wall and the side wall, and a second cavity that matches the inner curved surface. The first fixture includes a boss and a limiting plate located on the side of the boss facing the second fixture. The first cavity is recessed on the side of the boss facing the limiting plate. The second cavity is opened on the side of the limiting plate facing the boss. The guide cavity is opened on the side of the limiting plate away from the boss and communicates with the second cavity. The width of the core is smaller than the width of the guide cavity so that it can be dislodged from the guide cavity. The width of the rubber sleeve is larger than the width of the guide cavity.

6. The shell thermal press demolding fixture of claim 5, wherein: The core includes a first part and a second part coaxially connected. The first part is connected to the second fixture. The second part is located on the side of the first part away from the second fixture. The cross-section of the second part is smaller than that of the first part to facilitate insertion into or removal from the rubber sleeve.

7. The shell thermal press demolding fixture of claim 6, wherein: The outer diameter of the first part gradually decreases from near the second fixture to far away from the second fixture to form a platform shape.

8. The shell thermal press demolding fixture of claim 6, wherein: The second fixture has a through groove in the middle, and a connecting block for connecting the first part is detachably connected in the through groove. The connecting block near the wall of the first fixture and the inner peripheral wall of the through groove together form an inner groove for accommodating the core.

9. The shell heat press stripping jig of any one of claims 1 to 8, wherein: It also includes a lower template for supporting the first fixture and an upper template for engaging or disengaging the second fixture from the first fixture. The first fixture is detachably connected to the lower template, and the second fixture is detachably connected to the upper template.

10. The shell thermal press demolding fixture of claim 9, wherein: A positioning hole is provided between the lower template of the hot press table and the first fixture. A positioning bolt is inserted into the positioning hole to limit the first fixture to the lower template of the hot press table. A screw hole is provided between the upper template of the hot press table and the second fixture. A bolt is screwed into the screw hole to fix the second fixture to the upper template of the hot press table.

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