New energy vehicle central control interior embedded part pre-burying and injection molding integrated forming process and device

Abstract

The application relates to a new energy automobile central control interior embedded part pre-burying and injection molding integrated forming process and device, and belongs to the technical field of embedded part injection molding devices. The new energy automobile central control interior embedded part pre-burying and injection molding integrated forming process mainly comprises the following operation steps: step one: a nut embedded part is inserted into a nut embedded part groove in a lower mold of an injection molding mold, and a clamping plate in the nut embedded part groove positions the nut embedded part after the nut is inserted into the bottom; step two: an electromagnet is electrified to fix the clamping plate in the nut embedded part groove, and the nut embedded part is fixed; step three: an upper mold and the lower mold of the injection molding mold are closed; through close engagement of the clamping plate and the nut inner thread, the application solves the problem of axial movement of the nut in horizontal injection molding, the thread engagement can provide extremely high tensile strength and impact resistance, and the nut burying depth precision is ensured.

Description

Technical Field

[0001] This application relates to the field of insert injection molding equipment technology, and in particular to the integrated molding process and equipment for pre-embedding and injection molding of inserts for the central control interior of new energy vehicles. Background Technology

[0002] With the development of lightweighting and integration of new energy vehicles, more and more of their interior control components are made of engineering plastic injection molding. In order to facilitate subsequent assembly, metal nut inserts are usually pre-embedded inside the plastic parts during the injection molding process.

[0003] Currently, horizontal injection molding machines are commonly used in the industry to produce such parts. The existing production process usually involves manually or by a robot placing the nut insert onto the mandrel of the lower mold, followed by mold closing and injection molding. However, this method has some drawbacks.

[0004] In the horizontal mold opening and closing state of a horizontal injection molding machine, the nut insert placed on the mandrel lacks axial positioning. Under the vibration of mold closing or the impact of injection pressure, the nut is very easy to move along the mandrel axis, especially outward. At this time, in areas with large wall thickness such as the intersection of product ribs, the flow pressure of molten plastic can easily push the nut deeper, resulting in nut embedment depth. On the other hand, to prevent the injection molding liquid from entering the internal threads of the nut, if the end face of the nut is not tightly fitted to the bottom of the mold cavity during installation, and there is a tiny gap, the high-temperature plastic will seep into the nut. Once the high-temperature plastic enters the nut, the subsequent solidification of the plastic will affect the internal threads of the nut, which will be detrimental to the subsequent installation of bolts into the nut. Summary of the Invention

[0005] Therefore, it is necessary to provide an integrated molding process for the pre-embedding and injection molding of interior inserts for new energy vehicles, which mainly includes the following steps: Step 1: Insert the nut insert into the nut insert slot in the lower mold of the injection molding mold. After the nut is inserted to the bottom, the clamping plate in the nut insert slot positions the nut insert. Step 2: The electromagnet is energized to fix the clamping plate in the nut insert slot, thus completing the fixing of the nut insert; Step 3: The upper and lower molds of the injection molding die are closed; Step 4: The injection molding machine presses the molten injection material into the injection mold for integrated injection molding; Step 5: Cooling the injection mold to set the product shape; Step 6: Separate the upper and lower molds of the injection molding die; Step 7: When the electromagnet is de-energized, the clamping plate resets and separates from the nut insert. The nut insert in the nut insert slot is ejected, completing the demolding process. Step 8: Repeat steps 1 to 7 to proceed with the next round of production.

[0006] An integrated molding device for pre-embedding and injection molding of interior trim inserts for new energy vehicles, comprising: A mandrel is installed in the nut insert groove, and the mandrel is hollow. A pressure plate is slidably connected in the nut insert groove. A positioning rod is fixedly connected to the bottom of the pressure plate. The positioning rod is slidably connected in the mandrel. The diameters of the mandrel and the pressure plate are both smaller than the inner diameter of the nut insert. The ejector spring is installed inside the mandrel; An electromagnet is installed inside the core rod; Multiple sets of downward pressure rods are installed at the bottom of the pressure plate; Rotating component two is rotatably connected to the side of the mandrel; The clamp is rotatably connected to the end of the rotating assembly two that is away from the mandrel; When the nut insert is inserted into the nut insert slot, the nut insert is pushed down by the pressure plate to move the limiting rod downward. The electromagnet attracts and fixes the limiting rod. At the same time, the pressing rod pushes the rotating assembly two to lock the clamp plate to fix the nut insert.

[0007] To facilitate pushing the clamping plate toward the nut insert, preferably, the rotating assembly two includes a sleeve two, a return spring two, a sliding rod two, and a torsion spring shaft. One end of the sleeve two is mounted on the mandrel via the torsion spring shaft. The sliding rod two is slidably connected inside the sleeve two, and one end of the sliding rod two is rotatably connected to the clamping plate. The return spring two is disposed between the sliding rod two and the sleeve two.

[0008] To facilitate the movement of the clamping plate along the axis of the mandrel, preferably, multiple sets of sliding grooves are provided on the outer wall of the mandrel, and a return spring is installed in each of the multiple sets of sliding grooves. A sliding block is slidably connected in the sliding groove, one end of the sliding block is connected to the return spring, and the torsion spring shaft is mounted on the sliding block.

[0009] Preferably, a limiting rod is installed in the groove, and the sliding block is slidably connected to the limiting rod.

[0010] To reduce the occurrence of tooth knocking, preferably, a rotating component is installed on the lower pressure rod. The rotating component is used to pull the upper half of the clamping plate so that the clamping plate is in a state where the top is tilted towards the mandrel.

[0011] Preferably, the rotating assembly includes a sleeve, a tension spring, and a sliding rod. The sleeve is rotatably connected to the lower pressure rod, the tension spring is installed inside the sleeve, and the sliding rod is slidably connected inside the sleeve. One end of the sliding rod is connected to the tension spring, and the other end of the sliding rod is rotatably connected to the upper half of the clamping plate.

[0012] Preferably, there is a gap between the bottom of the pressure rod and the second sleeve.

[0013] To facilitate the locking and fixing of the clamping plate to the nut insert via threads, preferably, the clamping plate has external threads on its surface near the nut insert, and the pitch of the external threads on the clamping plate is the same as the pitch of the internal threads of the nut insert.

[0014] To facilitate the threaded connection between the clamping plate and the nut insert, preferably, the external thread depth on the clamping plate is smaller than the internal thread depth of the nut insert.

[0015] Compared with the prior art, the present invention provides an automatic loading and unloading equipment for bundled materials, which has the following beneficial effects: This application solves the problem of axial movement of nuts in horizontal injection molding by tightly engaging the clamping plate with the internal thread of the nut. The thread engagement provides extremely high tensile strength and impact resistance, ensuring the accuracy of nut embedment depth.

[0016] Meanwhile, the clamping plate ensures that the bottom of the nut insert is always in close contact with the bottom surface of the nut insert groove before injection molding. This close fit effectively prevents molten plastic from entering the threaded hole, ensuring that the internal threads of the nut are not contaminated by plastic, which facilitates subsequent bolt installation.

[0017] In addition, the clamping plate is initially conical and inclined, which serves as a guide. Combined with the non-rigid connection of the torsion spring shaft, the clamping plate can engage with the nut by first contacting the lower end and then gradually screwing it in. This method can effectively reduce the risk of thread interference and tooth jamming, extend the mold life, and reduce the frequency of maintenance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ; Figure 3 For the present invention Figure 2 An enlarged schematic diagram of part A in the middle; Figure 4 This is a cross-sectional schematic diagram of the lower mold of the injection molding die in this invention; Figure 5 For the present invention Figure 4 Enlarged schematic diagram of part B in the middle; Figure 6 For the present invention Figure 5 An enlarged schematic diagram of section C; Figure 7 For the present invention Figure 5 An enlarged schematic diagram of section D in the middle; Figure 8 For the present invention Figure 5 An enlarged schematic diagram of section E in the middle; Figure 9 This is a schematic diagram of the structure of the nut insert, pressure plate, mandrel, and clamping plate in this invention.

[0019] In the diagram: 1. Injection mold; 2. Nut insert groove; 3. Mandrel; 301. Slide groove; 302. Return spring component one; 303. Limiting rod; 304. Sliding block; 401. Pressure plate; 402. Positioning rod; 403. Ejection spring component; 404. Electromagnet; 5. Downward pressure rod; 6. Clamping plate; 701. Sleeve one; 702. Tension spring; 703. Sliding sleeve one; 801. Sleeve two; 802. Return spring component two; 803. Sliding sleeve two; 804. Torsion spring shaft. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0021] Example: Refer to Figures 1-3 An integrated molding device for pre-embedding and injection molding of interior trim inserts for new energy vehicles includes an injection molding mold 1. The lower mold cavity has a nut insert groove 2 for inserting a nut insert. A mandrel 3 for fixing the nut is installed in the nut insert groove 2. The mandrel 3 is slightly smaller than the nut insert to facilitate insertion. During processing, the nut insert is placed on the mandrel 3 in the nut insert groove 2 by a robotic arm or manually. Subsequent processes include mold closing, injection molding, and demolding. However, since horizontal injection molding machines are commonly used in the industry, there is a possibility that the nut insert may move axially on the mandrel 3 after being placed in the nut insert groove 2, especially outwards. During subsequent injection molding, the depth of the nut insert in the injection-molded interior trim may change, particularly in thicker areas such as rib intersections, where the nut insert may become too deep. When combined with other accessories, the screw head may not reach the bottom of the nut, causing the connection strength to fail to meet the pre-set requirements. This may result in gaps at the connection, which is detrimental to use.

[0022] To solve the above problems, the following implementation methods can be adopted, such as... Figures 4-7As shown, the mandrel 3 is hollow, and a pressure plate 401 is slidably connected in the nut insert groove 2. A positioning rod 402 is fixedly connected to the bottom of the pressure plate 401 and slidably connected in the mandrel 3. The diameters of the mandrel 3 and the pressure plate 401 are both smaller than the inner diameter of the nut insert. An ejector spring 403 and an electromagnet 404 are installed inside the mandrel 3. Multiple sets of downward pressure rods 5 are installed at the bottom of the pressure plate 401. A rotating assembly two is rotatably connected to the side of the mandrel 3. When in use, the nut insert is inserted into the nut insert groove 2. The pressure plate 401 is pressed and moves laterally, which drives the downward pressure rods 5 to move laterally. At this time, the reset spring 302 is compressed and shortened. The downward pressure rods 5 move synchronously and squeeze the rotating assembly two, causing the clamping plate 6 to move closer to the nut insert until the clamping plate 6 and the inner diameter of the nut insert are close. After the wall is firmly attached and fixed, the limiting rod 303 moves to the bottom of the mandrel 3 and contacts the electromagnet 404. The electromagnet 404 is energized to fix the limiting rod 303 and lock the nut insert. At the same time, the bottom of the nut insert will fit with the nut insert groove 2. The clamping plate 6 locks the nut insert in place. During subsequent injection molding, the nut insert can be pulled to the bottom of the nut insert groove 2 and fixed. This prevents the nut insert from moving on the mandrel 3 during injection molding, which could cause changes in the depth of the nut insert in the injection molded part. After the nut insert is completely placed into the nut insert groove 2, it will fit with the bottom of the nut insert groove 2, preventing the injection molding liquid from entering the nut insert during subsequent injection molding and improving the quality of the injection molded product.

[0023] Subsequently, the following steps can be performed: mold closing, injection molding, cooling and shaping, mold separation, and demolding. During demolding, the electromagnet 404 is de-energized. Since the reset spring 302 was previously in a contracted state, the pressure plate 401 will be reset under the action of the reset spring 302 after the electromagnet 404 is de-energized. During this process, the torsion spring shaft 804 will first drive the clamping plate 6 to push against the nut insert and move continuously. Finally, the surface fixation of the nut insert will be released, and the injection-molded interior of the new energy vehicle center console will be ejected from the lower mold, completing the demolding.

[0024] In a preferred embodiment, the clamping plate 6 has an external thread on its surface near the nut insert. The pitch of the external thread on the clamping plate 6 is the same as the pitch of the internal thread of the nut insert. When the clamping plate 6 is close to the inner wall of the threaded insert, the thread on the clamping plate 6 will gradually engage and fix with the internal thread of the nut insert. Finally, the limiting rod 303 moves to the bottom of the mandrel 3 and contacts the electromagnet 404. The electromagnet 404 is energized to fix the limiting rod 303 and lock the nut insert. At the same time, the bottom of the nut insert will fit with the nut insert groove 2. The external thread of the clamping plate 6 engages and fixes with the internal thread of the nut insert, making the fixation of the threaded insert more stable. This further avoids the possibility of the nut insert moving due to the impact of the injection molding liquid during the injection molding process, so that the position of the threaded insert in the injection molded part after production can be kept consistent, which can improve the quality of the product after injection molding.

[0025] In a preferred embodiment, such as Figure 7 As shown, the rotating assembly two includes a sleeve two 801, a return spring two 802, a sliding rod two 803, and a torsion spring shaft 804. One end of the sleeve two 801 is connected to the mandrel 3 via the torsion spring shaft 804. The sliding rod two 803 is slidably connected inside the sleeve two 801, and one end of the sliding rod two 803 is rotatably connected to the clamping plate 6. The return spring two 802 is installed inside the sleeve two 801 and is positioned between the sliding rod two 803 and the sleeve two 801. When the nut insert is inserted into the mandrel 3, the movement of the pressure plate 401 will drive the lower pressure rod 5 to move, thereby squeezing the sleeve two 801. 1. Sleeve 2 801 will rotate under the action of torsion spring shaft 804, so that the external thread on the clamping plate 6 enters the internal thread of the nut insert. Since the torsion spring shaft 804 will make the clamping plate 6 non-rigidly contact the internal thread of the nut insert, the clamping plate 6 will naturally slide on the inner wall of the internal thread of the nut insert under the action of the external thread, thus completing the connection between the external thread of the clamping plate 6 and the internal thread of the nut insert, locking and fixing the nut insert, improving stability, and having a certain upper and lower matching allowance for the internal thread of the nut insert, avoiding the problem of mismatch between the thread clearance of the local position of the nut insert and the external thread of the clamping plate 6 after installation, which would prevent stability.

[0026] In a preferred embodiment, such as Figure 8 As shown, the outer wall of the mandrel 3 is provided with multiple sets of sliding grooves 301. Each set of sliding grooves 301 is equipped with a return spring component 302. A sliding block 304 is slidably connected in the sliding groove 301. One end of the sliding block 304 is connected to the return spring component 302. The torsion spring shaft 804 is installed on the sliding block 304. A limit rod 303 is installed in the sliding groove 301. The sliding block 304 is slidably connected to the limit rod 303. At this time, under the action of the pressure plate 401, the pressure rod 5 moves to make the clamping plate 6 engage with the internal thread of the nut insert. If the nut insert is not fully in place and still needs to move, the sleeve 801 will continue to move along the sliding groove 301 until the subsequent nut insert is fully in place. This avoids the situation where the clamping plate 6 contacts the nut insert and completes the fixation, but the nut insert is not in place. This allows the nut insert to continue to move until the bottom is tightly attached to the nut insert groove 2, preventing the injection molding liquid from entering the nut insert.

[0027] In a preferred embodiment, such as Figure 6As shown, a rotating assembly 1 is installed on the lower pressure rod 5. The rotating assembly 1 includes a sleeve 1 701, a tension spring 702, and a sliding sleeve rod 1 703. The sleeve 1 701 is rotatably connected to the lower pressure rod 5. The tension spring 702 is installed inside the sleeve 1 701. The sliding sleeve rod 1 703 is slidably connected inside the sleeve 1 701. One end of the sliding sleeve rod 1 703 is connected to the tension spring 702, and the other end of the sliding sleeve rod 1 703 is rotatably connected to the upper half of the clamping plate 6. There is a gap between the bottom of the lower pressure rod 5 and the sleeve 2 801. In use, in the initial state, the tension spring 702 in the rotating assembly 1 will pull the top of the clamping plate 6, causing the clamping plate 6 to be in an inclined state. This will create an approximately conical shape, facilitating the insertion of the nut insert. As the pressing rod 5 moves, the downward force will cause the rotating assembly 1 to gradually rotate. Furthermore, the tension spring 702 will first gradually release its potential energy and then gradually be compressed, causing the clamping plate 6 to tilt further. The side will abut against the internal thread of the nut insert, achieving initial thread engagement and fixation. As the pressing rod 5 continues to move and presses the sleeve 801 of the rotating assembly 2, the generated force will cause the rotating assembly 2 to rotate along the torsion spring shaft 804, facilitating the engagement of the external threads on the clamping plate 6 with the internal threads of the nut insert. At this point, the nut insert is fixed at its closed end, ultimately completing the locking and fixing of the threaded insert. During the subsequent demolding and resetting process, the clamping plate 6 will first be engaged with the internal thread of the nut insert. Then, the clamping plate 6 will gradually move away from the inner wall of the nut insert. At the same time, the clamping plate 6 will gradually tilt under the action of the inner tension spring 702 of the rotating component, and then the side will abut against the inner wall of the nut insert to decelerate the nut insert and avoid the situation where the rapid resetting of the ejector spring 403 will directly eject the interior of the new energy vehicle center console from the lower mold. Finally, the new energy vehicle center console interior will be removed by the robotic arm.

[0028] In a preferred embodiment, such as Figure 9 As shown, multiple sets of grooves 301 are arranged in a ring at equal intervals on the outer wall of the mandrel 3. This arrangement can uniformly apply thrust to the inner wall of the nut insert, ensuring that the nut insert is coaxial with the mandrel 3 and preventing the nut insert from being skewed on the mandrel 3, which facilitates subsequent injection molding.

[0029] In a preferred embodiment, the tooth depth on the clamping plate 6 is less than the internal thread of the nut insert. This arrangement allows the clamping plate 6 to engage more smoothly with the internal thread of the nut insert, further reducing tooth breakage and thread damage on the clamping plate 6. This facilitates long-term use of the device and reduces the frequency of maintenance.

[0030] The integrated molding process for pre-embedded and injection-molded interior trim inserts in new energy vehicles mainly includes the following steps: Step 1: Insert the nut insert into the nut insert groove 2 in the lower mold of the injection molding mold 1. During the insertion process, the nut insert contacts the pressure plate 401 that is initially protruding from the mandrel 3. Due to the pulling effect of the rotating component 1, the clamping plate 6 is in a conical inclined state at this time, which guides the nut insert and allows it to move relatively smoothly. After the nut is inserted to the bottom, the clamping plate 6 in the nut insert groove 2 positions the nut insert. Step 2: The electromagnet 404 is energized to fix the clamping plate 6 in the nut insert slot 2, thus completing the fixing of the nut insert; Step 3: The upper and lower molds of the injection molding die 1 are closed under the action of the horizontal injection molding machine; Step 4: The injection molding machine presses the molten injection molding material into the injection molding mold 1 for integrated injection molding; Step 5: The injection mold 1 cools down using its own water-cooling function to shape the product; Step 6: Separate the upper and lower molds of injection molding mold 1; Step 7: When the electromagnet 404 is de-energized, the pressure plate 401 will be reset under the action of the reset spring 302. The torsion spring shaft 804 will first drive the clamping plate 6 away from the nut insert. The clamping plate 6 will separate from the nut insert, and the nut insert in the nut insert groove 2 will be ejected, thus completing the demolding. Step 8: Repeat steps 1 to 7 to proceed with the next round of production.

Claims

1. An integrated molding process for pre-embedding and injection molding of interior trim inserts in new energy vehicles, characterized in that, The main operating steps are as follows: Step 1: Insert the nut insert into the nut insert groove (2) in the lower mold of the injection molding mold (1). After the nut is inserted to the bottom, the clamping plate (6) in the nut insert groove (2) positions the nut insert. Step 2: The electromagnet (404) is energized to fix the clamp plate (6) in the nut insert slot (2), thus completing the fixing of the nut insert; Step 3: The upper and lower molds of the injection molding die (1) are closed; Step 4: The injection molding machine presses the molten injection molding material into the injection molding mold (1) for integrated injection molding; Step 5, Injection Molding Mold (1) Cooling down to set the product shape; Step 6, Injection Molding Mold (1) Separation of Upper and Lower Molds; Step 7: The electromagnet (404) is de-energized, the clamping plate (6) is reset and separated from the nut insert, the nut insert in the nut insert groove (2) is ejected, and the demolding is completed; Step 8: Repeat steps 1 to 7 to proceed with the next round of production.

2. A device for integrated pre-embedding and injection molding of interior trim inserts for new energy vehicles, used in the integrated pre-embedding and injection molding process for interior trim inserts for new energy vehicles as described in claim 1, characterized in that, include: The mandrel (3) is installed in the nut insert groove (2), and the mandrel (3) is hollow. The pressure plate (401) is slidably connected in the nut insert groove (2). The bottom of the pressure plate (401) is fixedly connected to a positioning rod (402). The positioning rod (402) is slidably connected in the mandrel (3). The diameters of the mandrel (3) and the pressure plate (401) are both smaller than the inner diameter of the nut insert. The ejector spring (403) is installed inside the mandrel (3); An electromagnet (404) is installed inside the core rod (3); Multiple sets of pressure rods (5) are installed at the bottom of the pressure plate (401); Rotating component two is rotatably connected to the side of the mandrel (3); The clamp (6) is rotatably connected to the end of the rotating assembly two that is away from the core rod (3); When the nut insert is inserted into the nut insert groove (2), the nut insert is pressed down by the pressure plate (401) to move the limiting rod (303) downward. The electromagnet (404) attracts and fixes the limiting rod (303). At the same time, the pressing rod (5) presses the rotating assembly two to lock and fix the clamp (6) to the nut insert.

3. The integrated molding device for pre-embedding and injection molding of interior trim inserts for new energy vehicles according to claim 2, characterized in that, The rotating assembly two includes a sleeve two (801), a reset spring two (802), a sliding rod two (803), and a torsion spring shaft (804). One end of the sleeve two (801) is mounted on the mandrel (3) via the torsion spring shaft (804). The sliding rod two (803) is slidably connected inside the sleeve two (801). One end of the sliding rod two (803) is rotatably connected to the clamping plate (6). The reset spring two (802) is disposed between the sliding rod two (803) and the sleeve two (801).

4. The integrated molding device for pre-embedding and injection molding of interior trim inserts for new energy vehicles according to claim 3, characterized in that, The outer wall of the core rod (3) is provided with multiple sets of sliding grooves (301) arranged in a ring at equal intervals. Each set of sliding grooves (301) is equipped with a reset spring component (302). A sliding block (304) is slidably connected in the sliding groove (301). One end of the sliding block (304) is connected to the reset spring component (302). The torsion spring shaft (804) is mounted on the sliding block (304).

5. The integrated molding device for pre-embedding and injection molding of interior trim inserts for new energy vehicles according to claim 4, characterized in that, A limiting rod (303) is installed in the groove (301), and the sliding block (304) is slidably connected to the limiting rod (303).

6. The integrated molding device for pre-embedding and injection molding of interior trim inserts for new energy vehicles according to claim 5, characterized in that, A rotating component is installed on the pressure rod (5). The rotating component is used to pull the upper part of the clamping plate (6) so that the clamping plate (6) is tilted towards the mandrel (3) at the top.

7. The integrated molding device for pre-embedding and injection molding of interior trim inserts for new energy vehicles according to claim 6, characterized in that, The rotating assembly includes a sleeve (701), a tension spring (702), and a sliding rod (703). The sleeve (701) is rotatably connected to the lower pressure rod (5). The tension spring (702) is installed inside the sleeve (701). The sliding rod (703) is slidably connected inside the sleeve (701). One end of the sliding rod (703) is connected to the tension spring (702), and the other end of the sliding rod (703) is rotatably connected to the upper half of the clamping plate (6).

8. The integrated molding device for pre-embedding and injection molding of interior trim inserts for new energy vehicles according to claim 7, characterized in that, There is a gap between the bottom of the pressure rod (5) and the sleeve (801).

9. The integrated molding device for pre-embedding and injection molding of interior trim inserts for new energy vehicles according to claim 7, characterized in that, The clamping plate (6) has an external thread on its surface near the nut insert, and the pitch of the external thread on the clamping plate (6) is the same as the pitch of the internal thread of the nut insert.

10. The integrated device for pre-embedding and injection molding of interior trim inserts for new energy vehicles according to claim 9, characterized in that, The external thread depth on the clamp (6) is less than the internal thread depth of the nut insert.

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