Insert plastic coating mold, plastic coating process and plastic coating product

Abstract

The invention discloses an insert plastic coating mold, a plastic coating process and a plastic coating product, the plastic coating mold comprises a mold and a floating needle assembly, the mold is composed of an upper mold and a lower mold, the upper mold and the lower mold are matched to form a cavity for insert plastic coating, and the floating needle assembly comprises a plurality of floating needles and a floating needle driving mechanism; the floating needle extends into the cavity from the two opposite sides of the embedded part and realizes clamping or releasing action through the floating needle driving mechanism; the plastic coating process is realized on the basis of the mold, and molding is completed through the steps of clamping and positioning, injection molding, timely releasing and cooling and demolding. The problems that in an existing plastic coating technology, an insert is prone to displacement, a fusion seam exists on the surface of a product or even a cavity cannot be formed through fusion, the metal insert is short-circuited after deviating, the product yield is low, and the requirement for mass production cannot be met are solved, and the plastic coating mold has the advantages of being high in positioning precision, smooth in demolding and stable in product quality and is suitable for plastic coating machining of various inserts.

Description

Technical Field

[0001] This invention relates to plastic coating technology, specifically to an insert plastic coating mold, a plastic coating process based on the mold, and a plastic-coated product made using the process. Background Technology

[0002] In industrial production, in-line plastic coating is a common process that involves encapsulating plastic material onto the surface of metal or other material inserts through injection molding to form composite products. It is widely used in the automotive, electronics, and machinery industries. However, existing in-line plastic coating technologies have the following prominent problems:

[0003] Insufficient positioning accuracy of embedded parts: Existing plastic encapsulation molds mostly use a single support or simple snap-fit ​​structure to fix the embedded parts. During the injection molding process, when the high temperature and high pressure molten plastic impacts the embedded parts, it is easy to cause the embedded parts to shift or deviate, resulting in uneven thickness of the plastic coating layer, which affects the product assembly accuracy and performance.

[0004] Incomplete plastic coating; some molds use floating pins to hold the inserts, and the timing of the floating pins' withdrawal is not properly controlled, resulting in fusion gaps between the plastic-coated parts and the corresponding floating pins, or even voids in the fusion.

[0005] Complex structure and low production efficiency: Some high-precision positioning molds use multiple sets of linkage fixtures, which are complex in structure and cumbersome to debug. Furthermore, the clamping and demolding actions are not smoothly connected, which prolongs the production cycle and reduces production efficiency.

[0006] In view of the shortcomings of the existing technology, there is an urgent need to design an insert encapsulation solution that is accurate in positioning, smooth in demolding, and simple in structure to solve the above technical problems. Summary of the Invention

[0007] To overcome the shortcomings of the prior art, the present invention aims to provide an insert molding process, a molding process, and a molded product.

[0008] To achieve the above and other related objectives, the technical solution provided by the present invention is: an insert mold, comprising:

[0009] A mold, the mold including a cavity for encapsulating an insert, the cavity being provided with an injection port;

[0010] The floating needle assembly includes multiple sets of floating needles and a floating needle driving mechanism. The multiple sets of floating needles extend into the cavity and are located on two opposite sides of the insert. The floating needle driving mechanism is used to control the multiple sets of floating needles to clamp or release the insert.

[0011] The preferred technical solution is as follows: the mold includes an upper mold and a lower mold, the upper mold has an upper cavity on its bottom side, and the lower mold has a lower cavity on its top side, the upper cavity and the lower cavity corresponding vertically to form the cavity.

[0012] The preferred technical solution is that the injection port is located on the upper mold and connected to the upper cavity.

[0013] The preferred technical solution is as follows: the floating needle includes an upper floating needle and a lower floating needle. The upper floating needle extends into the upper cavity through the upper mold, and the lower floating needle extends into the lower cavity through the lower mold. The floating needle driving mechanism is used to control the upper floating needle and the lower floating needle to move towards each other to clamp and fix the insert, or to control the upper floating needle and the lower floating needle to move away from each other to release the insert.

[0014] A plastic encapsulation process based on the above-mentioned insert encapsulation molding includes the following steps:

[0015] Step 1: Select the corresponding mold according to the specifications of the insert, and place the insert into the cavity;

[0016] Step 2: Control the extension of multiple sets of floating needles through the floating needle drive mechanism to clamp the insert;

[0017] Step 3: Fill the cavity with molten plastic through the injection port. During this process, after the molten plastic on the inner wall of the cavity can support the insert, and before the molten plastic on the outer wall of the float pin can be fused again to fill the space left by the retraction of the float pin, the float pin drive mechanism controls multiple sets of float pins to retract to release the insert.

[0018] Step 4: Once the molten plastic has completely solidified, open the cavity and remove the product.

[0019] A plastic-coated product, said plastic-coated product being manufactured based on the above-described plastic-coating process.

[0020] Due to the application of the above technical solution, the beneficial effects of this invention are as follows:

[0021] High positioning accuracy solves the problem of insert displacement: The insert is clamped from opposite sides by the upper and lower floating pins to form bidirectional positioning. The clamping force is uniform and stable, which can effectively resist the impact of molten plastic, avoid the insert from shifting or tilting during injection molding, ensure uniform plastic layer thickness, and improve product assembly accuracy.

[0022] Smooth demolding and protection of product surface quality: The "timely release" mechanism is adopted to withdraw the floating pin in time after the coating layer is initially formed and can support the insert, so as to avoid the problem of fusion gap or fusion void at the contact position between the insert and the floating pin.

[0023] Simple structure and improved production efficiency: The floating needle assembly has a simple structure, the drive mechanism controls the action quickly, the clamping and releasing actions are smoothly connected, no complicated debugging process is required, the molding cycle is shortened and the production efficiency is improved;

[0024] Wide applicability and stable product quality: The mold can be flexibly adapted to the specifications of the inserts, and the holding force of the floating pins can be adjusted through the drive mechanism. It is suitable for plastic coating of inserts of different materials and sizes, and the process steps are controllable, resulting in good product consistency and stable quality. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the internal structure of the mold involved in the present invention.

[0026] Figure 2 This is a process flow diagram related to the present invention. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0028] Please see Figures 1-2 It should be noted that in the description of this invention, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These terms are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. The terms "horizontal," "vertical," and "suspended," etc., do not indicate that the component must be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] Example:

[0031] Implementation of the structure of the embedded component mold

[0032] like Figure 1 As shown, in this embodiment, the insert mold includes an upper mold 1 and a lower mold 2; the injection port 11 is located in the middle of the upper mold 1 and connects to the upper cavity.

[0033] The floating needle assembly includes multiple sets of upper floating needles 31 and multiple sets of lower floating needles 32. The upper floating needles 31 are vertically arranged along the upper mold 1, and the lower floating needles 32 are vertically arranged along the lower mold 2. The floating needle drive mechanism is driven by a hydraulic cylinder. The hydraulic cylinder is connected to the control system through a solenoid valve, which can precisely control the extension and retraction stroke (and movement speed) of the floating needles, and realize flexible adjustment of the clamping force.

[0034] The implementation process of plastic coating process ( Figure 2 )

[0035] Preparation stage: Select metal inserts, and choose upper mold 1 and lower mold 2 with corresponding cavity sizes according to their specifications. Pre-position upper mold 1 and lower mold 2 to ensure that the upper cavity and lower cavity are aligned.

[0036] Insert placement and positioning: Open the mold, place the metal insert 100 into the preset position of the lower cavity, start the floating pin drive mechanism, control the lower floating pin 32 to extend upward to the preset height, and then control the upper floating pin 31 to extend downward, cooperate with the lower floating pin 32 to clamp and fix the insert 100 from the upper and lower sides, ensuring that the insert is not loose.

[0037] Injection molding process: Molten PPS plastic is injected into the cavity through injection port 11 until the cavity is completely filled;

[0038] Timely release of floating needles: During the injection molding process, when the molten plastic on the inner wall of the cavity has initially solidified to form a support layer, the molten plastic on the surface of the floating needles is still in an unsolidified state. The control system sends a signal, and the floating needle drive mechanism controls the upper floating needle 31 to move upward and the lower floating needle 32 downward in opposite directions, retracting to the initial position and releasing the insert 100.

[0039] Cooling and demolding: Continue to keep the mold closed for 10-15 seconds to cool. Once the molten plastic has completely cooled and solidified, open the upper mold 1 and use the lower floating pin 32 to help eject the product and remove the finished product.

[0040] Performance verification of plastic-coated products

[0041] The plastic-coated product obtained in this embodiment has a uniform plastic layer thickness and a tight bond with the metal insert; the product surface is smooth and free from defects such as floating needle marks and scratches; the insert does not shift or skew, and the assembly accuracy meets the design requirements.

[0042] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An insert molding die characterized by, The application relates to a plastic injection mold and a plastic injection process. The mold comprises a mold cavity for embedding an inner part, and an injection port. The mold comprises an upper mold and a lower mold, the upper mold is provided with an upper mold cavity at the bottom side, the lower mold is provided with a lower mold cavity at the top side, and the upper mold cavity and the lower mold cavity correspond to each other to form the mold cavity.

2. An insert molding die according to claim 1, wherein: The injection port is arranged on the upper mold and communicates with the upper mold cavity.

3. An insert-molded part according to claim 2, characterized in that: The floating needle comprises an upper floating needle and a lower floating needle, the upper floating needle extends into the upper mold cavity through the upper mold, the lower floating needle extends into the lower mold cavity through the lower mold, and the floating needle driving mechanism is used for controlling the upper floating needle and the lower floating needle to move towards each other to clamp and fix the inner part or to control the upper floating needle and the lower floating needle to move reversely to release the inner part.

4. An insert molding die according to claim 2, wherein: The application further discloses a plastic injection process.

5. A process for overmolding a part based on the insert-molded part of any of claims 1-4, characterized in that, Step one: selecting the mold according to the specification of the inner part, and placing the inner part into the mold cavity; Step two: controlling the floating needles to extend out to clamp the inner part through the floating needle driving mechanism; Step three: filling the mold cavity with molten plastic through the injection port, and after the molten plastic on the inner wall of the mold cavity can support the inner part, and before the molten plastic on the outer wall of the floating needle can be secondarily fused to fill the space left by the floating needle, controlling the floating needles to retreat to release the inner part through the floating needle driving mechanism; Step four: opening the mold cavity after the molten plastic is completely solidified, and taking out the product. The plastic injection product is prepared based on the plastic injection process.

6. A coated product, characterized by: ​

Images