Lightweight injection molding jig

Abstract

This utility model relates to the field of injection molding fixture technology and discloses a lightweight injection molding fixture, including an upper fixture, a lower fixture, and a locking mechanism disposed between the upper and lower fixtures. The upper and lower fixtures are arranged vertically and vertically, forming a sealed cavity for injection. The locking mechanism includes a positioning groove and a magnetic valve. A positioning pin is disposed in the positioning groove and passes through the upper and lower fixtures for positioning. The magnetic valves are respectively disposed on opposite sides of the upper and lower fixtures and are positioned accordingly for adsorption and locking of the upper and lower fixtures. Both the upper and lower fixtures are injection molded and have a hollow center. The injection molding fixture of this utility model has a short manufacturing cycle, low cost, high operating efficiency, and high stability.

Description

Technical Field

[0001] This utility model relates to the field of injection molding fixture technology, specifically a lightweight injection molding fixture. Background Technology

[0002] In the field of injection molding and glue injection, jigs are key tools for achieving product molding. Early jigs had relatively simple structures and were mainly used for processing small products. With the development of technology, product sizes and structures are constantly changing, and the requirements for jigs are becoming increasingly demanding.

[0003] In LIPO injection molding, traditional fixtures typically consist of an upper and a lower fixture, both made of metal. Throughout their development, metal fixtures have played a crucial role in the injection molding of small products (such as mobile phones), creating cavities through clamping between upper and lower molds for injection molding. However, when dealing with large-sized or wide-bezel products (such as tablets, displays, and laptops), the shortcomings of traditional metal fixtures become increasingly apparent. Metal fixtures, with their monolithic sheet metal structure, are difficult to adapt flexibly to large-sized or wide-bezel products, failing to effectively create sealed cavities and affecting injection molding results. The weight of the metal material itself makes the fixture bulky, requiring significant manpower for transport and installation, increasing labor costs and the workload of automated equipment, resulting in low operational efficiency. Furthermore, the locking of the upper and lower fixtures relies on a manually operated snap-fit ​​structure, which is not only time-consuming and labor-intensive but also prone to wear due to repeated opening and closing, affecting the fixture's lifespan and locking stability. Qualitatively, the complex assembly structure and numerous parts of metal fixtures result in a long overall production cycle and high production costs, especially in mass production, leading to poor economic efficiency. For large-sized products, there is significant loss of adhesive flow during the injection process, and the core structure within the fixture obstructs the adhesive flow, easily causing defects such as delamination and porosity during molding, affecting product quality and lifespan. Traditional plastic stoppers are made of plastic, which is prone to deformation due to high temperatures during subsequent curing, making them difficult to remove. Furthermore, plastic stoppers are consumables, non-recyclable, and consumed in large quantities, especially in large-screen / large-bezel injection, where at least 8 pieces are used per piece, increasing costs and wasting resources. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a lightweight injection molding fixture with advantages such as short manufacturing cycle, low cost, high operating efficiency, and high stability. It solves problems such as poor applicability of large-size products for injection molding, bulky fixtures, low locking efficiency, high cost, poor injection quality, and inconvenient use of glue stoppers.

[0005] To achieve the aforementioned goals of short production cycle, low cost, high operational efficiency, and high stability, this utility model provides the following technical solution: a lightweight injection molding fixture, comprising an upper fixture, a lower fixture, and a locking mechanism disposed between the upper and lower fixtures. The upper and lower fixtures are arranged vertically and vertically, forming a sealed cavity for injection. The locking mechanism includes a positioning groove and a magnetic valve. A positioning pin is disposed in the positioning groove, and the positioning pin passes through the upper and lower fixtures for positioning. The magnetic valve is disposed on the opposite sides of the upper and lower fixtures, and is positioned accordingly, for adsorption and locking of the upper and lower fixtures. Both the upper and lower fixtures are injection molded and have a hollow center.

[0006] Preferably, both the upper and lower fixtures are provided with bolt mounting grooves at their edges, and bolts are embedded in the bolt mounting grooves.

[0007] Preferably, the magnetic valve includes a first magnetic block disposed on the upper fixture and a second magnetic block disposed on the lower fixture, wherein the first magnetic block and the second magnetic block are positioned correspondingly and can attract each other.

[0008] Preferably, there are 6 positioning slots, which are evenly distributed at the edges of the upper and lower fixtures.

[0009] Preferably, the bolt is made of glass fiber plastic composite material, and the bolt is interference-fitted with the bolt mounting groove.

[0010] Preferably, the lower fixture is provided with an injection port, and a glue plug is fixedly installed inside the injection port. The glue plug is made of metal, and the side wall of the glue plug is provided with a groove or tooth structure to increase the bonding strength.

[0011] Preferably, the rubber stopper is threadedly connected to the glue injection port.

[0012] Preferably, the outer surfaces of both the upper and lower fixtures are provided with anti-slip textures.

[0013] Preferably, the thickness of the upper and lower fixtures is 3-5 mm.

[0014] Compared with the prior art, this utility model provides a lightweight injection molding fixture, which has the following beneficial effects:

[0015] 1. This lightweight injection-molded fixture, with its injection-molded and hollowed-out structure, significantly reduces weight compared to traditional metal fixtures, lowering labor costs for transportation and installation, and reducing the load on transmission equipment. Furthermore, the injection molding process allows for mass production with a short cycle time and low cost, resulting in significant economic advantages in mass production.

[0016] 2. This lightweight injection molding fixture, through a locking mechanism using positioning pins and a magnetic valve, replaces the traditional manual clamping structure, enabling rapid positioning and locking of the upper and lower fixtures and improving work efficiency. The magnetic force of the magnetic valve is adjustable, and multiple magnetic structures can be independently controlled, making it more suitable for injection locking of large-size, wide-frame products, solving the wear and stability problems of traditional mechanical structures.

[0017] 3. This lightweight injection molding fixture, through the setting of edge bolts, effectively constrains and supports the product structure during glue injection, improves glue flow, reduces defects such as delamination and porosity during the molding process, and improves product quality and lifespan.

[0018] 4. This lightweight injection molding fixture uses metal plugs that are heat-resistant, not easily deformed, easy to remove, and recyclable, reducing material consumption and lowering costs. It is especially suitable for injection molding scenarios with large screens or large bezels. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the upper fixture structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the lower fixture structure of this utility model.

[0022] In the diagram: 1. Upper fixture; 11. Positioning groove; 12. Magnetic valve; 2. Lower fixture; 21. Bolt mounting groove; 22. Bolt; 23. Glue injection port; 24. Glue plug; 3. Anti-slip texture; 4. Hollowed-out. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figures 1-3As shown, a lightweight injection molding fixture includes an upper fixture 1, a lower fixture 2, and a locking mechanism disposed between the upper fixture 1 and the lower fixture 2. The upper fixture 1 and the lower fixture 2 are arranged vertically and vertically, forming a sealed cavity for injection. The locking mechanism includes a positioning groove 11 and a magnetic valve 12. A positioning pin is disposed in the positioning groove 11, passing through the upper fixture 1 and the lower fixture 2, for positioning. The magnetic valve 12 is disposed on the opposite sides of the upper fixture 1 and the lower fixture 2, and is positioned accordingly, for adsorption and locking of the upper fixture 1 and the lower fixture 2. Both the upper fixture 1 and the lower fixture 2 are injection molded and have a hollowed-out center 4. The positioning pin in the positioning groove 11 passes through the upper fixture 1 and the lower fixture 2, ensuring accurate alignment when the mold is closed, guaranteeing the dimensional and positional accuracy of the sealed cavity, thereby ensuring that the size and shape of the injection molded product meet the design requirements. The magnetic valve 12 is disposed on the opposite sides of the upper and lower fixtures 2, and is positioned accordingly, achieving tight locking of the two through magnetic adsorption. This helps maintain the sealing of the cavity during the injection process, preventing the adhesive from overflowing, while also withstanding a certain injection pressure to ensure the stability of the fixture. The upper fixture 1 and the lower fixture 2 are injection molded with a hollowed-out center 4. On the one hand, this reduces the weight of the fixture, making it easier for operators to handle and operate, achieving a lightweight design. On the other hand, the hollowed-out structure 4 can save materials and reduce costs without affecting the strength and function of the fixture, while also facilitating heat dissipation and improving production efficiency.

[0025] like Figure 3 As shown, both the upper fixture 1 and the lower fixture 2 have bolt mounting grooves 21 at their edges, and bolts 22 are embedded in the bolt mounting grooves 21. The bolts 22 are used to constrain and support the product structure during glue injection, limit the flow range of the glue during injection, ensure the dimensional accuracy of the product, and avoid glue overflow or deformation. They also provide local support for thin-walled and complex structural parts, preventing the fixture or product from shifting or collapsing due to glue injection pressure. The bolts 22 are embedded in the bolt mounting grooves 21 and can be flexibly replaced according to the product shape, improving the versatility of the fixture and reducing mold development costs. They also share the impact force during the glue injection process, reduce the wear of the fixture edges, and extend the service life.

[0026] In one embodiment of this solution, the magnetic valve 12 includes a first magnetic block disposed on the upper fixture 1 and a second magnetic block disposed on the lower fixture 2. The first magnetic block and the second magnetic block are positioned correspondingly and can attract each other. The magnetic force is used to quickly align and fit the upper and lower fixtures 2, improving clamping efficiency and reducing manual operation time. The magnetic force provides uniform attraction force to ensure that the sealed cavity between the fixtures fits tightly and prevents glue leakage during glue injection. The magnetic pre-positioning assists in precise alignment of the positioning pin, while buffering the impact force of mold closing and reducing fixture wear. The magnetic attraction can be quickly released by power failure or external force, which facilitates fixture separation and product removal, making it suitable for automated production lines.

[0027] Furthermore, there are 6 positioning grooves 11, which are evenly distributed on the edges of the upper fixture 1 and the lower fixture 2. The even distribution of multiple points ensures that the upper and lower fixtures 2 are precisely aligned in three dimensions (X / Y / Z axes), avoiding product size deviations due to misalignment during injection. The 6-point support disperses the mold closing pressure, preventing deformation of the fixture edges due to uneven force, and improving the stability of the sealed cavity. The even layout is suitable for large-sized or irregular fixtures, especially for products that require strict edge positioning (such as multi-cavity injection molded parts), ensuring consistent positioning accuracy in each area. The symmetrically distributed positioning grooves 11 can guide the fixture to align quickly, reducing manual alignment time and making it suitable for mass production on assembly lines.

[0028] Furthermore, bolt 22 is made of fiberglass-plastic composite material, and bolt 22 is interference-fitted with bolt mounting groove 21. Through the combination of fiber and resin matrix, fiberglass-plastic composite material retains the lightweight and corrosion-resistant properties of plastic while significantly improving tensile strength, stiffness and impact resistance. The interference fit can precisely control the installation position of bolt 22, thereby ensuring the dimensional accuracy of the product and maintaining the correct shape and size during injection molding. Although it is an interference fit, bolt 22 can still be removed by appropriate external force when it needs to be replaced, which is convenient for maintenance and replacement to meet the production needs of different products.

[0029] like Figure 3 As shown, the lower fixture 2 is provided with a glue injection port 23, and a glue plug 24 is fixedly installed inside the glue injection port 23. The glue plug 24 is made of metal. In one embodiment of this utility model, the side wall of the glue plug 24 is provided with a groove or tooth structure to increase the bonding strength; the glue plug 24 is threadedly connected to the glue injection port 23; it can withstand the high pressure of glue injection and the impact of glue flow, avoiding deformation or damage; it can adapt to the high temperature environment of injection molding and extend its service life; the groove / tooth structure functions to tightly fit with the inner wall of the glue injection port 23 through mechanical interlocking (such as knurling, sawing), preventing the glue plug 24 from loosening or falling off; it fills the mating gap and reduces the risk of glue overflowing from the connection.

[0030] like Figure 1 As shown, both the upper fixture 1 and the lower fixture 2 have anti-slip textures 3 on their outer surfaces. This increases the friction between the operator's hand and the fixture, allowing the operator to hold the fixture more firmly when picking up, moving, and operating it, preventing the fixture from slipping from their hands and improving the safety and convenience of operation. When the fixture is placed on a workbench or other equipment, the anti-slip textures 3 can increase the friction between the fixture and the contact surface, reducing the possibility of the fixture shifting due to external impacts or equipment vibrations, ensuring that the fixture maintains a stable position during operation, which is beneficial for improving processing accuracy and product quality.

[0031] Furthermore, the thickness of the upper fixture 1 and the lower fixture 2 is 3-5mm. This thickness range ensures that the fixtures are not easily deformed or damaged when subjected to injection pressure, clamping force, and various external forces during the product molding process, thus ensuring the molding accuracy of the product. Appropriate thickness facilitates the uniform dissipation of heat during injection molding, avoiding poor heat dissipation due to excessive thickness, which would affect product quality and production efficiency, or excessive thinness, which would cause heat loss too quickly and increase energy consumption. This thickness also makes the fixtures of moderate weight, which is convenient for operators to handle and operate, while also controlling material costs and achieving economy while meeting usage requirements.

[0032] Working Principle: Select a lightweight injection molding fixture of appropriate specifications based on the size and structure of the product to be injected. Check that the sealed cavities of the upper fixture 1 and lower fixture 2 are clean, that bolts 22 are securely embedded in the bolt mounting slots 21, that the magnetic valve 12 and positioning pins are functioning properly, and that the glue plug 24 is installed at the injection port 23 with a secure threaded connection. Place the product to be injected in the corresponding position within the sealed cavity of the lower fixture 2, and use the shape and structure of the fixture to initially position the product. Then, align the upper fixture 1 with the lower fixture 2, inserting the positioning pin into the positioning holes of both fixtures to achieve precise positioning. Next, the magnetic valve 12 is activated by the control unit, causing the first and second magnetic blocks to attract each other, locking the upper and lower fixtures 2 and forming a sealed cavity. Adhesive is injected into the sealed cavity using an injection device. During injection, bolts 22 constrain and support the product structure, ensuring the adhesive fills the cavity evenly, reducing flow loss and obstruction of the adhesive by the core structure, thus improving molding quality. After injection, the adhesive is allowed to cure. Once cured, the magnetic valve 12 is closed by the control unit, releasing the attraction between the upper and lower fixtures 2. The upper fixture 1 is then manually separated from the lower fixture 2. Because the stopper 24 is made of metal and has grooves / toothed structures on its sidewalls, the cured adhesive adheres firmly to the stopper 24 while being easy to clean. The stopper 24 can be easily removed, completing the product injection molding process. After use, the fixtures are cleaned, and all components are inspected for damage or wear. The metal stopper 24 can be cleaned and recycled for reuse, reducing costs.

[0033] In summary, this lightweight injection molding fixture, through its injection-molded structure with a central hollow section 4, significantly reduces weight compared to traditional metal fixtures, lowering labor costs for transportation and installation, and reducing the load on transmission equipment. Simultaneously, the injection molding process allows for mass production with a short cycle time and low cost, resulting in significant economic advantages in mass production. The locking mechanism using positioning pins and magnetic valves 12 replaces the traditional manual latching structure, enabling rapid positioning and locking of the upper and lower fixtures 2, improving operational efficiency. The adjustable magnetic force of the magnetic valves 12, with multiple independently controllable magnetic structures, makes it more suitable for injection locking of large-size, large-bezel products, solving the wear and stability problems of traditional mechanical structures. The edge bolts 22 effectively constrain and support the product structure during injection, improving glue flow, reducing defects such as delamination and porosity during molding, and improving product quality and lifespan. The glue stopper 24, made of metal, is heat-resistant, not easily deformed, easy to remove, and recyclable, reducing consumable consumption and lowering costs, making it particularly suitable for injection scenarios involving large screens or large bezels.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lightweight injection molding fixture, characterized by: The device includes an upper fixture, a lower fixture, and a locking mechanism disposed between the upper and lower fixtures. The upper and lower fixtures are arranged vertically and vertically, forming a sealed cavity for glue injection. The locking mechanism includes a positioning groove and a magnetic valve. A positioning pin is disposed in the positioning groove and passes through the upper and lower fixtures for positioning. The magnetic valves are respectively disposed on opposite sides of the upper and lower fixtures and are positioned accordingly to achieve adsorption and locking of the upper and lower fixtures. Both the upper and lower fixtures are injection molded and have a hollow center.

2. The lightweight injection molding fixture of claim 1, wherein: Both the upper and lower fixtures are provided with bolt mounting grooves at their edges, and bolts are embedded in the bolt mounting grooves.

3. The lightweight injection molding fixture of claim 1, wherein: The magnetic valve includes a first magnetic block disposed on the upper fixture and a second magnetic block disposed on the lower fixture. The first magnetic block and the second magnetic block are positioned correspondingly and can attract each other.

4. The lightweight injection molding fixture of claim 1, wherein: The number of positioning slots is 6, and the positioning slots are evenly distributed on the edge positions of the upper fixture and the lower fixture.

5. The lightweight injection molding fixture of claim 2, wherein: The bolt is made of fiberglass plastic composite material, and the bolt is interference-fitted with the bolt mounting groove.

6. The lightweight injection molding fixture of claim 1, wherein: The lower fixture is provided with an injection port, and a glue plug is fixedly installed inside the injection port. The glue plug is made of metal, and the side wall of the glue plug is provided with a groove or tooth structure to increase the bonding strength.

7. The lightweight injection molding fixture of claim 6, wherein: The rubber stopper is threadedly connected to the glue injection port.

8. The lightweight injection molding fixture of claim 1, wherein: Both the upper and lower fixtures have anti-slip textures on their outer surfaces.

9. The lightweight injection molding fixture of claim 1, wherein: The thickness of the upper and lower fixtures is 3-5 mm.

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