An injection molding device for a silicone seal

Abstract

The present invention discloses an injection molding device for a silicone sealant, wherein the silicone sealant comprises a material base and a silicone portion coated on the upper end of the material base; the injection molding device comprises a forming matching mold; the forming matching mold comprises an upper mold core and a lower mold core, wherein the upper mold core is provided with an upper mold cavity insert, and the lower mold core is provided with a lower mold cavity insert; the material base is inserted into the lower mold cavity insert, and the internal shape of the upper mold cavity insert is adapted to the silicone portion; after the upper mold core and the lower mold core are molded together, an injection molding cavity is formed between the upper mold cavity insert and the lower mold cavity insert; the upper mold cavity insert is a metal part, and the lower mold cavity insert is a plastic part. Using the injection molding device of the present invention can reduce product precision requirements, greatly improve product yield, reduce burrs and increase the manpower required in subsequent processes, and improve the production efficiency of silicone sealant products.

Description

Technical Field

[0001] The invention belongs to the technical field of molding, and in particular relates to an injection molding device for a silicone seal. Background Art

[0002] Silicone products are highly sought after by consumers and manufacturers alike. Made from liquid silicone, they possess excellent elasticity, water and moisture resistance, and are resistant to corrosion by various chemicals, including acids and alkalis. Silicone does not contain any harmful substances and is not easily deformed. They are often used to replace plastic products in daily life. Silicone baby bottles, for example, are a popular and popular silicone product. With the evolving sealing requirements of the 3C industry, more and more silicone seals are entering the consumer market.

[0003] Silicone seals have high product requirements, such as high precision and a lack of burrs. They also place high demands on molds. Existing silicone seals, after injection molding, have low yield rates and are prone to burring, requiring a post-process deburring. This process requires additional manpower, significantly reducing production efficiency and increasing costs. Summary of the Invention

[0004] To address the shortcomings of the prior art, the present invention provides an injection molding device for a silicone sealant, wherein the silicone sealant comprises a base material and a silicone portion covering the upper end of the base material. Specific embodiments of the present invention are as follows:

[0005] The injection molding device of the present invention forms a matching mold; the forming matching mold includes an upper mold core and a lower mold core that cooperate with each other, the upper mold core is provided with an upper mold cavity insert, and the lower mold core is provided with a lower mold cavity insert; the material base is inserted into the lower mold cavity insert, and the internal shape of the upper mold cavity insert is adapted to the silicone part; after the upper mold core and the lower mold core are molded together, an injection cavity is formed between the upper mold cavity insert and the lower mold cavity insert; the upper mold cavity insert is a metal part, and the lower mold cavity insert is a plastic part.

[0006] As a further improved solution, the material base is a metal piece.

[0007] As a further improved solution, the lower mold cavity insert includes a lower mold outer cavity insert and a lower mold inner cavity insert, and the material base is inserted between the lower mold outer cavity insert and the lower mold inner cavity insert.

[0008] As a further improvement, an upper die auxiliary screw is provided on the outer side of the upper die core, and a lower die auxiliary screw is provided on the outer side of the lower die core.

[0009] As a further improvement solution, the injection molding device is further configured with a lower mold interchangeable matching mold for rapid replacement, and the lower mold interchangeable matching mold includes a lower mold core and a lower mold cavity insert.

[0010] As a further improvement solution, the injection molding device is further configured with an upper mold interchangeable matching mold for rapid replacement, and the upper mold interchangeable matching mold includes an upper mold core and an upper mold cavity insert.

[0011] As a further improvement, the upper mold core and the lower mold core are respectively provided with N groups of upper mold cavity inserts and lower mold cavity inserts that cooperate with each other, and N is 32 or 64.

[0012] As a further improved solution, the injection molding device further includes an upper mold plate and a lower mold plate; the upper mold core and the upper mold plate are detachably fixedly connected, and the lower mold core and the lower mold plate are detachably fixedly connected.

[0013] As a further improved solution, the injection molding device further includes a nozzle, a runner, a panel, and a stripper plate, and the panel, stripper plate, upper mold plate, and upper mold core are stacked in sequence from top to bottom.

[0014] As a further improved solution, the injection molding device further includes a lower mold push plate, a push rod, and a bottom plate; the lower mold push plate is arranged between the lower mold plate and the bottom plate;

[0015] One end of the ejector pin is fixedly connected to the lower mold push plate, and the other end of the ejector pin passes through the lower mold plate and abuts against the cavity insert in the lower mold; the ejector pin moves up and down under the drive of the lower mold push plate;

[0016] A positioning column is provided between the lower mold plate and the lower mold push plate, and the lower mold push plate moves up and down along the positioning column under the action of external force.

[0017] The present invention has the following technical effects:

[0018] The use of the injection molding device in the present invention can reduce product precision requirements, for example, relax product precision from the original 0.005mm to ±0.05mm, greatly improving product yield; and after using the injection molding device in the present invention, product burrs are reduced, avoiding the increase in manpower in the subsequent process; thereby improving the production efficiency of silicone seal products and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of the injection molding device of the silicone seal of the present invention

[0020] Figure 2 A partial cross-sectional view of the injection molding device of the present invention at the injection cavity position;

[0021] Figure 3 It is a structural schematic diagram of a silicone seal, an upper mold cavity insert, and a lower mold outer cavity insert according to a specific embodiment of the present invention.

[0022] Reference numerals:

[0023] Panel 1, stripper plate 2, upper mold plate 3, nozzle 4, runner 5, upper mold core 6, upper mold auxiliary screw 7, lower mold core 8, lower mold auxiliary screw 9, lower mold plate 10, ejector pin 11, positioning column 12, bottom plate 13, lower mold push plate 14, upper mold cavity insert 15, lower mold outer cavity insert 16, lower mold inner cavity insert 17, silicone seal 20, silicone part 21, material base 22, gate 30. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0025] As attached Figures 1-3 Shown is a schematic structural diagram of the injection molding device of the silicone seal provided in this embodiment.

[0026] The silicone seal of the present application includes a material base and a silicone portion coated on the upper end of the material base. During injection molding, the material base is placed in the injection molding device in advance, and the silicone portion is directly injection-molded onto the hard material base. The silicone seal is a one-time overmolding product. The material base is a hard material, such as a plastic part or a metal part. Preferably, the material base is a metal part. The silicone portion is the functional part of the silicone seal and is used to perform the actual sealing function. Therefore, the silicone portion has higher product requirements.

[0027] The injection molding device of the silicone seal 20 of the present application includes a nozzle 4, a flow channel 5, and a forming supporting mold.

[0028] The forming supporting mold includes an upper mold core 6 and a lower mold core 8, and the upper mold core 6 and the lower mold core 8 cooperate with each other.

[0029] An upper mold cavity insert 15 is provided at the parting surface of the upper mold core 6. The upper mold core 6 has a first groove, into which the upper mold cavity insert 15 is embedded. A lower mold cavity insert is provided at the parting surface of the lower mold core 8. The lower mold core 8 has a second groove, into which the lower mold cavity insert is embedded.

[0030] During injection molding, the base material 22 is inserted into the lower mold cavity insert. When the upper mold core 6 and lower mold core 8 are closed, an injection cavity is formed between the upper mold cavity insert 15 and the lower mold cavity insert. The internal shape of the upper mold cavity insert 15 matches the shape of the silicone portion 21. During injection molding, molten liquid silicone flows into the injection cavity through the nozzle 4, runner 5, and gate 30.

[0031] The lower mold cavity insert of the present application is a plastic part, and the upper mold cavity insert 15 is a metal part.

[0032] In the existing design, burrs easily appear on the silicone product - silicone part 21 at the connection between the parting surface of the upper mold cavity insert 15 and the parting surface of the lower mold cavity insert. In order to avoid burrs, it is necessary to improve the tightness of the upper mold cavity insert 15 and the lower mold cavity insert at the parting surface to prevent the molten silicone from flowing out of the gap. In the prior art, the upper mold cavity insert 15 and the lower mold cavity insert are hardware parts, which are pure hardware sealants. On the one hand, improving the processing accuracy of the mold is bound to lead to a significant increase in processing costs. On the other hand, as a functional part, the silicone sealant 20 has extremely high requirements in this application. Under the existing conditions, it results in low production efficiency and high costs.

[0033] In contrast, the lower mold cavity insert of the present application is a plastic component, while the upper mold cavity insert 15 is a metal component. The plastic lower mold cavity insert and the metal upper mold cavity insert 15 are mated together. The plastic component is softer than the metal component and exhibits deformability under pressure. By designing an appropriate overpressure level for the lower mold cavity insert, the lower mold cavity insert and the upper mold cavity insert 15 can be tightly fitted together, thus preventing burrs and increasing labor requirements in subsequent processes. This improves production efficiency and reduces costs for the silicone seal 20.

[0034] The upper mold cavity insert 15 is still a metal mold, which has higher precision, thus ensuring higher dimensional accuracy requirements of the silicone part 21. The lower mold cavity insert is mainly a material base 22, and the use of plastic parts in the lower mold cavity insert does not affect the product function.

[0035] The lower mold cavity insert of the present application includes a lower mold outer cavity insert 16 and a lower mold inner cavity insert 17. A material base 22 is inserted between the lower mold outer cavity insert 16 and the lower mold inner cavity insert 17.

[0036] Preferably, the material base is a metal part - a hardware part. By making the lower mold cavity insert a plastic part and the upper mold cavity insert 15 a metal part, the precision requirement for the silicone sealant 20 is greatly reduced. The product precision can be relaxed to ±0.05mm from the original 0.005mm burr of pure hardware sealant, which greatly improves the yield of the material base 22 and greatly reduces the manpower of the post-process; because traditional pure hardware sealant cannot be over-pressurized, otherwise it will cause the material base to be crushed or deformed, so the precision requirements for the mold and product are relatively high. By changing the lower mold cavity insert to plastic, over-pressurization can be carried out, and the material base is a metal part, so there is no risk of crushing. Through improvements, the yield of the material base 22 can be improved by at least 50%, and manpower can be saved by more than 50%. At the same time, the problems of internal and external scraping and crushing caused by traditional hardware sealants can be reduced, and the product appearance yield can be improved.

[0037] The lower mold cavity insert can be made of materials such as PC, PMMA or PEEK, but it is understandable that other plastic materials can also be used, and the invention is not limited thereto. The specific material can be adjusted according to the different requirements of the silicone seal 20 product.

[0038] To further improve production capacity, N sets of cooperating upper mold cavity inserts 15 and lower mold cavity inserts are provided on the upper mold core 6 and the lower mold core 8, respectively, to achieve a one-out-many design. N is preferably 32 or 64, so that in one injection molding cycle, 32 or 64 can be produced. This greatly improves the production capacity of each mold set and avoids the traditional one-out-four, one-out-eight, or one-out-sixteen production methods. If the traditional design is one-out-eight, and this solution is one-out-thirty-two, assuming a molding cycle of 60 seconds, then the production capacity can be increased from 9.6K to 38.4K, and the yield rate and post-process deburring capacity are higher.

[0039] Since the lower mold cavity insert is made of plastic and has low strength, it suffers significant loss during injection molding. As a further improvement, lower mold core 8 is provided with lower mold auxiliary screws 9 on the outside. These screws allow the lower mold core 8 to be easily removed, facilitating replacement of the lower mold cavity insert to ensure product stability.

[0040] As a preferred embodiment, the injection molding apparatus is further equipped with a lower mold interchangeable matching mold for rapid replacement, comprising a lower mold core 8 and a lower mold cavity insert. For example, two sets of lower mold core 8 and lower mold cavity inserts may be provided: in addition to one set of lower mold core 8 and lower mold cavity inserts for production, another set of lower mold core 8 and lower mold cavity inserts may be added as the lower mold interchangeable matching mold.

[0041] The injection molding device of the present application is loaded outside the mold. When the lower mold cavity insert is greatly worn out during production, the upper mold core 6 and the upper mold cavity insert 15 serving as an interchangeable matching mold can be loaded outside the mold and directly replaced with a set of lower mold core 8 and lower mold cavity insert in the injection molding machine.

[0042] The injection molding device of the present application also includes an upper mold plate 3 and a lower mold plate 10. Preferably, the upper mold core 6 and the upper mold plate 3 are detachably fixedly connected. Preferably, the lower mold core 8 and the lower mold plate 10 are detachably fixedly connected. This facilitates the replacement of mold cores at a later stage.

[0043] If a new product needs to be produced, the injection molding system is also equipped with a quick-change upper mold. This upper mold interchangeable set includes an additional upper mold core 6 and an upper mold cavity insert 15. When replacement is needed, the upper mold core 6 and upper mold cavity insert 15 can be assembled outside the mold by loading the material. Upper mold auxiliary screws 7 are installed on the outside of the upper mold core 6. The upper mold core 6 and lower mold core 8 are easily replaceable, allowing the existing upper mold plate 3 and lower mold plate 10 to be used when producing a new product. Only the upper mold core 6 and lower mold core 8 need to be replaced, reducing the new mold development cycle and saving costs.

[0044] The injection molding device of the present application also includes a panel 1 and a stripper plate. The panel 1, stripper plate, upper mold plate 3, and upper mold core 6 are stacked in sequence from top to bottom, with the panel 1, stripper plate, and upper mold core 3 fixedly connected. A nozzle 4 and a runner 5 are embedded within the panel 1, stripper plate, upper mold plate 3, and upper mold core 6.

[0045] The injection molding device of the present application also includes a lower mold push plate 14, a push rod 11, and a bottom plate 13. The lower mold push plate 14 is arranged between the lower mold plate 10 and the bottom plate 13, and the lower mold push plate 14 can move up and down. One end of the push rod 11 is fixedly connected to the lower mold push plate 14, and the push rod 11 moves up and down under the drive of the lower mold push plate 14. The other end of the push rod 11 passes through the lower mold plate 10 and abuts against the cavity insert 17 in the lower mold, so that the push rod 11 can eject the product when the lower mold push plate 14 moves upward. A positioning column 12 is provided between the lower mold plate 10 and the lower mold push plate 14, and the lower mold push plate 14 moves up and down along the positioning column 12 under the action of external force.

[0046] The present invention has the following technical effects:

[0047] The use of the injection molding device in the present invention can reduce product precision requirements, for example, relax product precision from the original 0.005mm to ±0.05mm, greatly improving product yield; and after using the injection molding device in the present invention, product burrs are reduced, avoiding the increase in manpower in the subsequent process; and improving the production efficiency of silicone sealing products.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention rather than to limit them. Although the embodiments of the present invention are described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the embodiments of the present invention can still be modified or replaced by equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An injection molding device for a silicone seal, the silicone seal comprising a base material and a silicone portion covering an upper end of the base material; the injection molding device comprising a matching molding mold; characterized in that: The forming matching mold includes an upper mold core and a lower mold core that cooperate with each other, the upper mold core is provided with an upper mold cavity insert, and the lower mold core is provided with a lower mold cavity insert; The material base is inserted into the lower mold cavity insert, and the internal shape of the upper mold cavity insert is adapted to the silicone portion; after the upper mold core and the lower mold core are molded together, an injection mold cavity is formed between the upper mold cavity insert and the lower mold cavity insert; The upper mold cavity insert is a metal part, the lower mold cavity insert is a plastic part, the material base is a metal part, the lower mold cavity insert includes a lower mold outer cavity insert and a lower mold inner cavity insert, the material base is inserted between the lower mold outer cavity insert and the lower mold inner cavity insert, the upper mold core is provided with an upper mold auxiliary screw on the outside, and the lower mold core is provided with a lower mold auxiliary screw on the outside. The injection molding device is also equipped with a lower mold interchangeable matching mold for rapid replacement, the lower mold interchangeable matching mold includes a lower mold core and a lower mold cavity insert, and the injection molding device is also equipped with an upper mold interchangeable matching mold for rapid replacement, the upper mold interchangeable matching mold includes an upper mold core and an upper mold cavity insert.

2. The injection molding device according to claim 1, wherein: The upper mold core and the lower mold core are respectively provided with N groups of upper mold cavity inserts and lower mold cavity inserts that cooperate with each other, and the N is 32 or 64.

3. The injection molding device according to claim 1, wherein: The injection molding device further comprises an upper mold plate and a lower mold plate; the upper mold core and the upper mold plate are detachably fixedly connected, and the lower mold core and the lower mold plate are detachably fixedly connected.

4. The injection molding device according to claim 3, wherein: The injection molding device further comprises a nozzle, a runner, a panel, and a stripper plate. The panel, the stripper plate, the upper mold plate, and the upper mold core are stacked in sequence from top to bottom.

5. The injection molding device according to claim 4, characterized in that: The injection molding device further comprises a lower mold push plate, a push rod, and a bottom plate; the lower mold push plate is arranged between the lower mold plate and the bottom plate; One end of the ejector pin is fixedly connected to the lower mold push plate, and the other end of the ejector pin passes through the lower mold plate and abuts against the cavity insert in the lower mold; the ejector pin moves up and down under the drive of the lower mold push plate; A positioning column is provided between the lower mold plate and the lower mold push plate, and the lower mold push plate moves up and down along the positioning column under the action of external force.

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