A car column interior decoration injection molding equipment

Abstract

The present application relates to the technical field of automobile interior injection molding, and provides an automobile column interior injection molding equipment, which comprises an auxiliary injection unit with an angle adjusting function, an intelligent vibration control system and a modular mold assembly. The auxiliary injection unit is designed with an adjustable angle injection head of 15-30 degrees, cooperates with a spiral flow guide groove and an annular buffer cavity structure, and realizes directional filling of the melt in the complex corner area; the high-frequency micro-vibration generator automatically adjusts the vibration frequency (200-500 Hz) according to the real-time injection speed, effectively improves the melt flow performance; the modular mold design supports rapid changeover and can adapt to the A-pillar production requirements of different vehicle models. The equipment significantly improves the forming quality and production efficiency of the interior part, and improves the product weld mark strength, so that the surface roughness is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of automobile interior decoration injection molding, in particular to an automobile column interior decoration injection molding device. Background Art

[0002] The injection molding production of automobile pillar interior parts is a key process in automobile interior manufacturing, and is mainly used for hard or semi-soft parts such as decorative covers, brackets, and snap bases of A-pillars, B-pillars, and C-pillars.

[0003] During the injection molding of traditional automotive A-pillar interior parts, due to the multi-angle bends and thin-walled structure of the product, a single injection unit can easily lead to insufficient melt filling at corners, weld marks, or surface flow marks. Existing technologies usually improve the filling effect by increasing the injection pressure or mold temperature, but this can lead to material degradation, increased energy consumption, and shortened mold life. Some solutions attempt to add auxiliary injection points, but lack precise control over the melt flow direction, making it difficult to achieve uniform filling of complex curved areas. High-speed injection can also easily cause spray marks, affecting the appearance and mechanical properties of the product.

[0004] To this end, we propose an automobile pillar interior injection molding equipment. Summary of the Invention

[0005] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0006] A device for injection molding an automobile pillar interior, comprising an injection molding table, on which a clamping mechanism and an injection system are provided. The clamping mechanism includes a static mold, and the injection system is arranged on the static mold. The injection system includes a main injection unit and at least one auxiliary injection unit. The auxiliary injection unit includes an injection head, which is arranged at a corner of the static mold cavity. A spiral guide groove is provided at the tail end of the injection head for forming a directional molten material flow in the corner area of ​​the automobile A-pillar interior.

[0007] Preferably, the spiral angle of the spiral guide groove is 15-25°, the groove depth gradually decreases along the melt flow direction, and an annular buffer cavity is provided at the end. The volume of the annular buffer cavity is 1.2-1.8 times the cross-sectional area of ​​the injection head flow channel. The shear rate is reduced by volume expansion, the polymer chain is prevented from breaking, and the material structure is protected.

[0008] Preferably, the mold closing mechanism includes a right fixed plate, which is fixedly connected to the injection molding table, one side of the right fixed plate is fixedly connected to a shooting table moving mechanism, one side of the right fixed plate is provided with a movable template, and the shooting table moving mechanism drives the movable template to move and close the mold, and the injection molding table is also fixedly connected to a left fixed plate, the left fixed plate and the right fixed plate are symmetrically arranged, the left fixed plate is fixedly connected to a static template, and mold units are provided on the static template and the movable template.

[0009] Preferably, a guide rod is fixedly connected between the right fixed plate and the static template, and the guide rod guides the sliding of the movable template.

[0010] Preferably, the mold unit includes the static mold and the dynamic mold, and the static mold and the dynamic mold are modularly installed in the installation holes on the static mold plate and the dynamic mold plate through fixing bolts.

[0011] Preferably, the injection system further comprises a plasticizing injection machine, the pipelines of the plasticizing injection machine being respectively connected with the main injection pipeline in the main injection unit and the auxiliary injection pipeline in the auxiliary injection unit, and the main injection pipeline extends to the bottom of the cavity of the static mold.

[0012] Preferably, a slot is provided on the cavity of the static mold, a sealing plate is rotatably connected in the slot, the injection head passes through the sealing plate, the injection head extends to the cavity plane of the static mold, one end of the injection head is connected to the auxiliary injection pipeline through a radial rotary joint, and the end of the injection head away from the mold cavity is fixedly connected to an angle adjustment knob.

[0013] Preferably, the injection head 332 is bent 15-30 degrees at one end close to the mold cavity.

[0014] Preferably, a valve control system is further included, wherein the valve control system includes an auxiliary injection valve and a main injection valve, and the auxiliary injection valve and the main injection valve are fixedly connected to the auxiliary injection pipeline and the main injection pipeline respectively.

[0015] Preferably, a high-frequency micro-vibration generator is integrated on the movable platen of the mold clamping mechanism, the vibration frequency is 200-500 Hz, the vibration direction is parallel to the mold parting surface, and the vibration frequency is directly proportional to the current injection speed.

[0016] Beneficial effects of the present invention:

[0017] The present invention uses a main and auxiliary dual injection unit that works in tandem. The main injection unit fills the main body from the bottom of the mold cavity, while the auxiliary injection unit points to the corner area at an angle of 15-30 degrees, and cooperates with the spiral guide groove to induce the melt to spiral into the flow, thereby shortening the corner filling time, increasing the weld mark strength, and improving the filling effect in complex corner areas. The annular buffer cavity reduces the shear rate through volume expansion, avoiding polymer chain breakage. The high-frequency micro-vibration generator automatically adjusts the frequency (200-500Hz) according to the injection speed, eliminating flow mark defects during high-speed injection and improving the yield rate. The modular mold design and radial rotary joint facilitate the rapid replacement of injection heads of different specifications to meet the production needs of multiple models. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] in:

[0020] Figure 1 This is a schematic diagram of the overall structure of an automobile pillar interior injection molding equipment;

[0021] Figure 2 Schematic diagram of the connection structure of the mold clamping mechanism;

[0022] Figure 3 for Figure 2 A magnified schematic diagram of the structure at center A;

[0023] Figure 4 Schematic diagram of the connection structure between the feeding mechanism and the auxiliary injection unit;

[0024] Figure 5 for Figure 4 A magnified schematic diagram of the structure at B in the middle;

[0025] Figure 6 Schematic diagram of the connection structure between the mold clamping mechanism and the injection system;

[0026] Figure 7 for Figure 6 A magnified schematic diagram of the structure at position C in the middle;

[0027] Figure 8 Schematic diagram of the connection structure of the mold unit.

[0028] In the picture:

[0029] 1. Injection molding table;

[0030] 2. Clamping mechanism; 21. Right fixed plate; 22. Shooting platform moving mechanism; 23. Moving platen; 24. Left fixed platen; 25. Static platen; 26. Guide rods; 27. Mold unit; 271. Static mold; 272. Fixing bolts; 273. Moving mold; 274. Mounting holes;

[0031] 3. Injection system; 31. Plasticizing injection machine; 32. Main injection unit; 321. Main injection line; 33. Auxiliary injection unit; 331. Auxiliary injection line; 332. Injection head; 333. Spiral guide groove; 334. Annular buffer chamber; 335. Closing plate; 336. Angle adjustment knob; 337. Notch;

[0032] 4. Valve control system; 41. Auxiliary injection valve; 42. Main injection valve;

[0033] 5. Feeding mechanism; 51. Screw feeder; 52. Feeding pipeline;

[0034] 6. High-frequency micro-vibration generator. DETAILED DESCRIPTION

[0035] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] Example: Figures 1-8 As shown, an automobile pillar interior injection molding device includes an injection molding table 1, on which a clamping mechanism 2 and an injection system 3 are provided. The clamping mechanism 2 includes a static mold 271. The injection system 3 is arranged on the static mold 271. The injection system 3 includes a main injection unit 32 and at least one auxiliary injection unit 33. The auxiliary injection unit 33 includes an injection head 332, which is arranged at a corner of the mold cavity of the static mold 271. The tail end of the injection head 332 is provided with a spiral guide groove 333 for forming a directional molten material flow in the corner area of ​​the automobile A-pillar interior. The bottom of the mold cavity of the static mold 271 is provided with a main injection pipeline 321 of the main injection unit 32 for injecting melt from the bottom of the mold cavity, which is a main filling step. The injection head 332 of the auxiliary injection unit 33 is provided at the corner of the mold cavity of the static mold 271 (for example, a complex structure) for injecting melt into the corner of the mold cavity of the static mold 271. This is an auxiliary filling step used to repair areas that are difficult to fill in the main filling step.

[0037] Furthermore, the spiral guide groove 333 has a spiral angle of 15-25 degrees, the groove depth gradually decreases along the flow direction of the melt, and an annular buffer chamber 334 is provided at the end. The volume of the annular buffer chamber 334 is 1.2-1.8 times the cross-sectional area of ​​the flow channel of the injection head 332. The shear rate is reduced by volume expansion, the polymer chain is prevented from breaking, and the material structure is protected. The melt enters the injection head 332 through the auxiliary injection line 331. Since the tail of the injection head 332 is provided with a spiral guide groove 333 and the spiral angle is 15-25 degrees, the spiral angle induces the melt to do a spiral motion (the melt does a spiral motion). When the melt is ejected from the injection head 332, it flows in a circle and spreads evenly in all directions without accumulating at the corners. Eventually, the corners are as full as the straight edges, improving the filling quality of the melt at the corners of the mold cavity. The radial temperature gradient is eliminated, making the melt temperature more uniform and preventing cold material marks from reducing the quality of the product. At the same time, the tapered design of the spiral guide groove 333 increases the flow rate of the melt when it passes through, so that the melt has speed when it is ejected from the injection head 332, thereby better filling complex structures. The annular buffer cavity 334 reduces the shear rate by volume expansion, preventing the breakage of polymer chains and protecting the material structure.

[0038] Furthermore, the injection system 3 also includes a plasticizing injection machine 31, the pipelines of the plasticizing injection machine 31 are respectively connected to the main injection pipeline 321 in the main injection unit 32 and the auxiliary injection pipeline 331 in the auxiliary injection unit 33, and the main injection pipeline 321 extends to the bottom of the cavity of the static mold 271; the feeding pipe 52 in the feeding mechanism 5 replenishes the plastic particles into the spiral feeder 51, and then the spiral feeder 51 inputs the plastic particles into the plasticizing injection machine 31 at a preset speed, and the plasticizing injection machine 31 (the plasticizing injection machine 31 is a prior art and will not be described in detail here) melts the plastic particles and transports them to the main injection pipeline 321 and the auxiliary injection pipeline 331.

[0039] Furthermore, a slot 337 is provided on the cavity of the static mold 271, and a sealing plate 335 is rotatably connected in the slot 337. The injection head 332 passes through the sealing plate 335, and the injection head 332 extends to the cavity plane of the static mold 271. One end of the injection head 332 is connected to the auxiliary injection pipeline 331 through a radial rotary joint, and the end of the injection head 332 away from the mold cavity is fixedly connected to an angle adjustment knob 336; the melt enters the injection head 332 through the auxiliary injection pipeline 331, and is then ejected from the injection head 332 to fill the mold cavity.

[0040] Furthermore, the injection head 332 is bent 15-30 degrees at one end close to the mold cavity; it should be noted that the injection head 332 can be rotated by turning the angle adjustment knob 336, thereby adjusting the direction of the end of the injection head 332 and controlling the angle of melt injection (the angle is optimized through fluid simulation).

[0041] like Figure 1 、 Figure 2 and Figure 8 As shown, the clamping mechanism 2 includes a right fixed plate 21, which is fixedly connected to the injection molding table 1, and a shooting platform moving mechanism 22 is fixedly connected to one side of the right fixed plate 21. A movable plate 23 is provided on one side of the right fixed plate 21. The shooting platform moving mechanism 22 drives the movable plate 23 to move and clamp the mold. A left fixed plate 24 is also fixedly connected to the injection molding table 1. The left fixed plate 24 and the right fixed plate 21 are symmetrically arranged. A static plate 25 is fixedly connected to the left fixed plate 24, and a mold unit 27 is provided on the static plate 25 and the movable plate 23; the moving end of the shooting platform moving mechanism 22 passes through the right fixed plate 21 to drive the movable plate 23 to move, and the movable plate 23 drives the movable mold 273 and the static mold 271 on the static plate 25 to clamp the mold.

[0042] Furthermore, a guide rod 26 is fixedly connected between the right fixed plate 21 and the static plate 25 , and the guide rod 26 guides the movable plate 23 for sliding.

[0043] Furthermore, the mold unit 27 includes the static mold 271 and the movable mold 273, and the static mold 271 and the movable mold 273 are modularly installed in the mounting holes 274 on the static mold plate 25 and the movable mold plate 23 through fixing bolts 272; the static mold 271 and the movable mold 273 can be installed in the mounting holes 274 through the fixing bolts 272, which facilitates the disassembly and replacement of different mold units 27, so that the present invention can be applied to the processing and molding of various plastic parts.

[0044] like Figure 6 and Figure 7 As shown, it also includes a valve control system 4, which includes an auxiliary shot valve 41 and a main shot valve 42, and the auxiliary shot valve 41 and the main shot valve 42 are fixedly connected to the auxiliary injection pipeline 331 and the main injection pipeline 321 respectively; during the injection molding process, the main shot valve 42 is first opened, and the melt enters the main injection pipeline 321, and then the melt is ejected from the bottom of the mold cavity to fill the mold cavity, and the auxiliary shot valve 41 is opened after a short delay, and the melt passes through the auxiliary injection pipeline 331 and is then ejected from the injection head 332 to perform secondary filling on the corners of the mold cavity, thereby improving the filling effect at the corners and avoiding cavities (the opening gap between the main shot valve 42 and the auxiliary shot valve 41 is controlled by an external PLC, and the gap can be adjusted by optimization).

[0045] A high-frequency micro-vibration generator 6 is integrated on the movable platen 23 of the clamping mechanism 2, with a vibration frequency of 200-500 Hz, a vibration direction parallel to the mold parting surface, and a vibration frequency that is directly proportional to the current injection speed. The injection speed is monitored in real time (e.g., collected every 5 ms) by a high-precision encoder installed on the injection screw of the plasticizing injection machine 31, and the speed signal is transmitted to an external PLC controller. The controller automatically calculates the target vibration frequency based on the preset material coefficient k, and outputs a signal to drive an electromagnetic exciter (e.g., a Bräuer high-frequency vibrator) to adjust the vibration frequency of the high-frequency micro-vibration generator 6, ultimately forming an intelligent control of "faster speed → faster vibration" (when the injection speed is accelerated, the melt in the traditional process will hit the mold wall in a "jet-like" shape, forming a serpentine flow mark. High-frequency vibration can break the melt into thin streams, achieve laminar filling, and reduce surface roughness). It should be noted that the vibration frequency is automatically adaptively adjusted according to the injection speed. The above adjustment logic is prior art and will not be elaborated on here.

[0046] The workflow is as follows: First, the required static mold 271 and movable mold 273 are installed in the mounting holes 274 using the fixing bolts 272. Then, the movable end of the shooting platform moving mechanism 22 passes through the right fixed plate 21 to move the movable platen 23, which then drives the movable mold 273 to close the mold with the static mold 271 on the static platen 25. Simultaneously, the feeding pipe 52 in the feeding mechanism 5 replenishes plastic pellets into the screw feeder 51. The screw feeder 51 then feeds the plastic pellets into the plasticizing injection machine 31 at a preset speed. The plasticizing injection machine 31 melts the plastic pellets and delivers them to the main injection line 321 and the auxiliary injection line 331. During the injection molding process, the main shot valve 42 is first opened, and the melt enters the main injection line 321. Then the melt is ejected from the bottom of the mold cavity to fill the mold cavity. The auxiliary shot valve 41 is opened after a short delay, and the melt passes through the auxiliary injection line 331 and is then ejected from the injection head 332 to perform secondary filling on the corners of the mold cavity, thereby improving the filling effect at the corners and avoiding cavities. During the secondary filling process, the melt enters the injection head 332 through the auxiliary injection line 331. Since the tail of the injection head 332 is equipped with a spiral guide groove 333 with a helix angle of 15-25°, the helix angle induces the melt to spiral inward, eliminating radial temperature gradients, making the melt temperature more uniform and preventing cold material marks from reducing product quality. At the same time, the tapered design of the spiral guide groove 333 increases the flow rate of the melt as it passes through, ensuring that the melt has speed when it is ejected from the injection head 332, thereby better filling complex structures. The annular buffer chamber 334 reduces the shear rate through volume expansion, preventing polymer chain breakage and protecting the material structure. At the same time, the high-frequency micro-vibration generator 6 can break the melt into fine streams, achieving laminar filling and reducing surface roughness. The melt is then shaped, and the reverse movement of the shooting platform moving mechanism 22 drives the dynamic mold 273 and the static mold 271 to open, completing the blanking process.

[0047] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automobile column interior injection molding device, comprising an injection molding table (1), wherein the injection molding table (1) is provided with a mold clamping mechanism (2) and an injection system (3), characterized in that: The clamping mechanism (2) includes a static mold (271), the injection system (3) is arranged on the static mold (271), the injection system (3) includes a main injection unit (32) and at least one auxiliary injection unit (33), the auxiliary injection unit (33) includes an injection head (332), the injection head (332) is arranged at a corner of the mold cavity of the static mold (271), and a spiral guide groove (333) is provided at the tail end of the injection head (332) for forming a directional molten material flow in the corner area of ​​the automobile A-pillar interior trim; The spiral guide groove (333) has a spiral angle of 15-25°, and the groove depth gradually decreases along the melt flow direction. An annular buffer cavity (334) is provided at the end. The volume of the annular buffer cavity (334) is 1.2-1.8 times the cross-sectional area of ​​the flow channel of the injection head (332). The shear rate is reduced by volume expansion, thereby preventing polymer chain breakage and protecting the material structure. A notch (337) is provided on the cavity of the static mold (271), a sealing plate (335) is rotatably connected in the notch (337), the injection head (332) passes through the sealing plate (335), and the injection head (332) extends to the cavity plane of the static mold (271), one end of the injection head (332) is connected to the auxiliary injection pipeline (331) via a radial rotary joint, and an angle adjustment knob (336) is fixedly connected to the end of the injection head (332) away from the mold cavity; It also includes a valve control system (4), the valve control system (4) including an auxiliary injection valve (41) and a main injection valve (42), the auxiliary injection valve (41) and the main injection valve (42) being fixedly connected to the auxiliary injection pipeline (331) and the main injection pipeline (321), respectively.

2. The automobile pillar interior decoration injection molding equipment as described in claim 1, characterized in that: The mold clamping mechanism (2) includes a right fixed plate (21), the right fixed plate (21) is fixedly connected to the injection molding table (1), a shooting table moving mechanism (22) is fixedly connected to one side of the right fixed plate (21), a movable plate (23) is provided on one side of the right fixed plate (21), and the shooting table moving mechanism (22) drives the movable plate (23) to move and clamp the mold, and a left fixed plate (24) is also fixedly connected to the injection molding table (1), the left fixed plate (24) and the right fixed plate (21) are symmetrically arranged, a static plate (25) is fixedly connected to the left fixed plate (24), and a mold unit (27) is provided on the static plate (25) and the movable plate (23).

3. The automobile pillar interior decoration injection molding equipment as described in claim 2, characterized in that: A guide rod (26) is fixedly connected between the right fixed plate (21) and the static plate (25), and the guide rod (26) guides the sliding movement of the movable plate (23).

4. The automobile pillar interior decoration injection molding equipment as described in claim 2, characterized in that: The mold unit (27) includes the static mold (271) and the movable mold (273), and the static mold (271) and the movable mold (273) are modularly mounted in mounting holes (274) on the static mold plate (25) and the movable mold plate (23) via fixing bolts (272).

5. The automobile pillar interior decoration injection molding equipment as described in claim 1, characterized in that: The injection system (3) further includes a plasticizing injection machine (31), the pipelines of the plasticizing injection machine (31) being respectively connected to the main injection pipeline (321) in the main injection unit (32) and the auxiliary injection pipeline (331) in the auxiliary injection unit (33), and the main injection pipeline (321) extending to the bottom of the cavity of the static mold (271).

6. The automobile pillar interior decoration injection molding equipment as described in claim 5, characterized in that: The injection head (332) is bent 15-30 degrees at one end close to the mold cavity.

7. The automobile pillar interior decoration injection molding equipment as described in claim 1, characterized in that: A high-frequency micro-vibration generator (6) is integrated on the movable platen (23) of the mold clamping mechanism (2), with a vibration frequency of 200-500 Hz, a vibration direction parallel to the mold parting surface, and a positive proportional relationship between the vibration frequency and the current injection speed.

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