Multi-cavity injection molding mold for automotive grille decorative plastic parts

Abstract

This utility model provides a multi-cavity injection mold for automotive grille decorative plastic parts, belonging to the field of mold technology. It includes an upper mold plate and a lower mold plate, with several decorative part molding cavities arranged in a rectangular array between the upper and lower mold plates. The upper mold plate also has a combined injection mechanism connected to the molding cavities, and the lower mold plate has a top plate with several separate combined ejection mechanisms corresponding to the molding cavities. The mold, through its rectangular array multi-cavity design, enables simultaneous injection of multiple parts; the combined injection mechanism and the separate combined ejection mechanism work together to ensure uniform injection and avoid damage caused by traditional forced ejection, thus improving production efficiency and product qualification rate.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to a multi-cavity injection molding mold for automotive grille decorative plastic parts. Background Technology

[0002] Automotive grille trim parts are typically injection molded, and the side inserts of the grille trim mold need to extend into the trim part to form the slots on both sides. During demolding, existing technologies often use a forced ejection method to directly eject the trim part. Due to the tight fit between the side inserts and the slots, the forced ejection process is prone to causing hard pulling, resulting in damage to the edges of the trim part's slots, surface scratches, or overall deformation, seriously affecting product quality. At the same time, forced ejection also causes some wear and tear on the mold's side inserts, increasing maintenance costs.

[0003] For example, a Chinese patent discloses a parting line-free composite automotive upper grille center trim mold assembly [application number: 201822221402.0], which includes a template, a cavity for molding products is provided in the template, and an insert connected to the cavity and located above the cavity is also provided in the template. The two ends of the insert extend out of the two ends of the cavity, and an arc groove communicating with the cavity is provided at the bottom of the insert. Summary of the Invention

[0004] The purpose of this utility model is to address the above-mentioned problems by providing a multi-cavity injection molding mold for automotive grille decorative plastic parts.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A multi-cavity injection mold for automotive grille decorative plastic parts includes an upper mold plate and a lower mold plate. Several decorative part forming cavities are arranged in a rectangular array between the upper mold plate and the lower mold plate. The upper side of the upper mold plate is also provided with a combined glue injection mechanism connected to the several decorative part forming cavities. The lower side of the lower mold plate is also provided with a top plate. The top plate is provided with several separate combined ejection mechanisms corresponding to the decorative part forming cavities.

[0007] In the aforementioned multi-cavity injection molding mold for automotive grille decorative plastic parts, the detachable combined ejection mechanism includes several adapter seats arranged along the length of the decorative part molding cavity and fixed on the lower template. Each adapter seat is connected to two detachable ejector rods via two rotating shafts. The top of the detachable ejector rod penetrates the lower template vertically and is flush with the upper end face of the lower template. The decorative part molding cavity is located between the two detachable ejector rods, and a side insert that is horizontally inserted into the decorative part molding cavity is fixed to the top of the inner side wall of the detachable ejector rod. An ejector rod guide structure is provided between the two detachable ejector rods.

[0008] In the aforementioned multi-cavity injection molding mold for automotive grille decorative plastic parts, the ejector guide structure includes a horizontally arranged guide plate. The guide plate has inwardly recessed limiting grooves on both sides, corresponding to the separable ejector rods. The separable ejector rods are slidably disposed within the limiting grooves. The limiting grooves also have a guide inclined surface structure that moves the two separable ejector rods away from each other when the separable ejector rods move upward under the action of the top plate.

[0009] In the aforementioned multi-cavity injection molding mold for automotive grille decorative plastic parts, the guide slope structure includes a guide slope inclinedly disposed at the lower part of the limiting slide groove.

[0010] In the aforementioned multi-cavity injection molding mold for automotive grille decorative plastic parts, the side insert and the separable ejector pin are integrally molded.

[0011] In the aforementioned multi-cavity injection molding mold for automotive grille decorative plastic parts, a straight ejector rod is also provided between two adjacent sets of separable ejector rods. The straight ejector rod vertically penetrates the guide plate and its top is connected to the molding cavity of the decorative part.

[0012] In the aforementioned multi-cavity injection molding mold for automotive grille decorative plastic parts, the guide plate and the molding cavity of the decorative part are parallel in length direction.

[0013] In the aforementioned multi-cavity injection molding mold for automotive grille decorative plastic parts, the combined injection mechanism includes four rectangularly distributed manifolds. The lower side of the four manifolds is provided with an I-shaped connecting plate, which is connected to the four manifolds. The upper cover plate of the upper mold plate is also provided with an injection port connected to the connecting plate. Several injection tubes are provided on the manifolds.

[0014] In the above-mentioned multi-cavity injection molding mold for automotive grille decorative plastic parts, an injection insert is provided between two adjacent decorative part molding cavities. The injection insert is provided with an injection channel connected to the injection tube, and the two ends of the injection channel are respectively connected to the two decorative part molding cavities.

[0015] In the aforementioned multi-cavity injection molding mold for automotive grille decorative plastic parts, the injection insert is detachably fixed to the lower template by several bolts.

[0016] Compared with existing technologies, the advantages of this utility model are:

[0017] 1. The mold uses a multi-cavity design with rectangular array distribution to achieve simultaneous injection molding of multiple parts; the combination of combined injection mechanism and separate combined ejection mechanism ensures uniform injection and avoids damage caused by traditional forced ejection, thereby improving production efficiency and product qualification rate.

[0018] 2. The separate combined ejection mechanism adopts the design of connecting the adapter seat and the detachable ejector rod with a rotating shaft, so that the ejector rod can move separately; the side insert is fixed to the top of the inner side wall of the ejector rod, and can be separated from the decorative part slot with the ejector rod during the ejection process. This structure solves the demolding damage problem caused by the traditional side insert fixing. At the same time, the ejector rod guide structure ensures the stability of the ejection movement and reduces the risk of deformation of the decorative part.

[0019] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the external structure of this utility model;

[0021] Figure 2 This is a partial structural schematic diagram of the present invention;

[0022] Figure 3 This is a structural diagram of the lower template;

[0023] Figure 4 This is a partial structural diagram of the lower template;

[0024] Figure 5 This is a schematic diagram of a split-type combined ejection mechanism. Detailed Implementation

[0025] like Figures 1-5 As shown, a multi-cavity injection molding mold for automotive grille decorative plastic parts includes an upper mold plate 1 and a lower mold plate 2. A plurality of decorative part forming cavities 3 arranged in a rectangular array are provided between the upper mold plate 1 and the lower mold plate 2. The upper mold plate 1 is also provided with a combined glue injection mechanism 4 connected to the plurality of decorative part forming cavities 3. The lower mold plate 2 is also provided with a top plate 5. The top plate 5 is provided with a plurality of separate combined ejection mechanisms 6 corresponding to the decorative part forming cavities 3.

[0026] In this invention, the mold uses a multi-cavity design with rectangular array distribution to achieve simultaneous injection molding of multiple parts; the combination of the combined injection mechanism and the separate combined ejection mechanism ensures uniform injection and avoids damage caused by traditional forced ejection, thereby improving production efficiency and product qualification rate.

[0027] Specifically, the detachable combined ejection mechanism 6 includes several adapter seats 7 arranged along the length of the decorative part forming cavity 3 and fixed on the lower template 2. Each adapter seat 7 is connected to two separable ejector rods 8 via two rotating shafts. The top of each separable ejector rod 8 penetrates the lower template 2 vertically and is flush with the upper surface of the lower template 2. The decorative part forming cavity 3 is located between the two separable ejector rods 8, and a side insert 9, horizontally inserted into the decorative part forming cavity 3, is fixed to the top of the inner wall of each separable ejector rod 8. An ejector rod guide structure is provided between the two separable ejector rods 8. The detachable combined ejection mechanism adopts a rotating shaft connection design between the adapter seats and the separable ejector rods, allowing the ejector rods to move separately. The side insert is fixed to the top of the inner wall of the ejector rod and can detach from the decorative part slot during the ejection process along with the separation action of the ejector rod. This structure solves the demolding damage problem caused by the traditional fixed side insert, while the ejector rod guide structure ensures stable ejection movement and reduces the risk of deformation of the decorative part.

[0028] Specifically, the push rod guide structure includes a horizontally arranged guide plate 10. The guide plate 10 has inwardly recessed limiting grooves 11 on both sides, corresponding to the separable push rods 8. The separable push rods 8 are slidably disposed within the limiting grooves 11. The limiting grooves 11 also have a guide inclined surface structure that causes the two separable push rods 8 to move away from each other when they move upward under the action of the top plate 5. The guide plate and limiting grooves of the push rod guide structure cooperate to form a precise constraint on the separable push rods. The guide inclined surface structure within the limiting grooves causes the push rods to automatically move away from each other when they move upward. This design achieves synchronous linkage between the push rod separation action and the ejection action, avoiding jamming of the side inserts caused by push rod offset, ensuring that the side inserts smoothly disengage from the slots, and further reducing the probability of damage to the decorative parts.

[0029] Specifically, the guide ramp structure includes a guide ramp 12 inclined at the lower part of the limiting slide groove 11. The guide ramp structure, through the inclined guide ramp at the lower part of the limiting slide groove, provides a clear separation guide trajectory for the separable ejector pin. This design makes the ejector pin separation action smoother, avoids movement jamming caused by complex guide structures, ensures uniform force on the side inserts during demolding, and reduces scratch damage to the decorative part slots.

[0030] Preferably, the side insert 9 and the separable top rod 8 are integrally formed.

[0031] Specifically, a straight push rod 13 is provided between two adjacent sets of separable push rods 8. The straight push rod 13 vertically penetrates the guide plate 10 and its top is connected to the decorative part forming cavity 3. The straight push rods provided between adjacent separable push rods form a combined ejection system with the separable ejection mechanism. The straight push rods provide auxiliary ejection force to the main body of the decorative part, making the ejection force more balanced and avoiding excessive local force and deformation of the decorative part caused by ejection from a single separable push rod; at the same time, the vertical penetration design through the guide plate ensures stable movement of the straight push rods and improves the overall ejection reliability.

[0032] Specifically, the guide plate 10 and the decorative part forming cavity 3 are parallel in length direction.

[0033] Specifically, the combined injection mechanism 4 includes four rectangularly distributed flow dividers 14. I-shaped connecting plates 15 are located on the lower side of each flow divider 14, connecting the connecting plates 15 to the four flow dividers 14. An injection port connected to the connecting plates 15 is also provided on the cover plate on the upper side of the upper mold plate 1. Several injection tubes 16 are mounted on the flow dividers 14. The combined injection mechanism, through the cooperation of the rectangularly distributed flow dividers and the I-shaped connecting plates, achieves uniform flow distribution from the injection port to each molding cavity. Multiple sets of injection tubes correspond to each molding cavity, ensuring synchronous and uniform filling of the molten material. This structure solves the problem of product quality differences caused by uneven injection in traditional methods, improves the consistency of multi-cavity molded products, and simplifies the injection system structure for easier maintenance.

[0034] Specifically, a glue inlet 17 is provided between two adjacent decorative part molding cavities 3. The glue inlet 17 has a glue inlet channel 18 connected to the injection tube 16, and both ends of the glue inlet channel 18 are connected to the two decorative part molding cavities 3 respectively. The glue inlet 17 between adjacent molding cavities and the glue inlet channel connected at both ends enable a single channel to simultaneously supply material to both molding cavities. This design reduces the number of glue inlet channels, reducing melt loss; at the same time, it ensures that the filling speed and pressure of adjacent molding cavities are consistent, further improving the uniformity of multi-cavity product quality and avoiding product defects caused by differences in material supply.

[0035] Preferably, the glue-inserting block 17 is detachably fixed to the lower template 2 by a number of bolts.

[0036] The working principle of this utility model is as follows: the mold uses a multi-cavity design with a rectangular array to achieve simultaneous injection molding of multiple parts; the combination of the combined injection mechanism and the separate combined ejection mechanism ensures uniform injection and avoids the damage caused by traditional forced ejection, thereby improving production efficiency and product qualification rate.

[0037] The detachable combined ejection mechanism adopts a design that connects the adapter seat and the detachable ejector pin via a rotating shaft, allowing the ejector pin to move separately. The side insert is fixed to the top of the inner wall of the ejector pin and can disengage from the decorative part slot during the ejection process. This structure solves the demolding damage problem caused by the traditional fixed side insert. At the same time, the ejector pin guide structure ensures stable ejection movement and reduces the risk of deformation of the decorative part. The guide plate of the ejector pin guide structure cooperates with the limiting slide to form a precise constraint on the detachable ejector pin. The guide slope structure in the limiting slide causes the ejector pins to automatically move away from each other when moving upward. This design realizes the synchronous linkage between the ejector pin separation action and the ejection action, avoiding the side insert jamming caused by ejector pin offset, ensuring that the side insert smoothly disengages from the slot, and further reducing the probability of damage to the decorative part. The guide slope structure provides a clear separation guide trajectory for the detachable ejector pin through the inclined guide slope at the bottom of the limiting slide. This design makes the ejector pin separation action smoother, avoids movement jamming caused by complex guide structure, ensures that the side insert is subjected to uniform force during demolding, and reduces scratch damage to the decorative part slot;

[0038] The straight push rods installed between adjacent separable push rods form a combined ejection system with the separable ejection mechanism. The straight push rods provide auxiliary ejection force to the main body of the decorative component, making the ejection force more balanced and avoiding excessive local stress and deformation of the decorative component caused by ejection from a single separable push rod; at the same time, the design of the vertically penetrating guide plate ensures the stable movement of the straight push rods and improves the overall ejection reliability.

[0039] The combined injection mechanism utilizes rectangular distribution of flow dividers and I-beam connecting plates to achieve uniform flow distribution from the injection port to each molding cavity. Multiple injection tubes correspond to each molding cavity, ensuring synchronous and uniform filling of the molten material. This structure solves the product quality variation problem caused by uneven injection in traditional systems, improves the consistency of multi-cavity molded products, simplifies the injection system structure, and facilitates maintenance. Injection inserts between adjacent molding cavities and injection channels connected at both ends enable synchronous feeding of two molding cavities by a single channel. This design reduces the number of injection channels, lowers molten material loss, and ensures consistent filling speed and pressure between adjacent molding cavities, further improving the uniformity of multi-cavity product quality and avoiding product defects caused by material supply differences.

[0040] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A multi-cavity injection mold for automotive grille decorative plastic parts, comprising an upper mold plate (1) and a lower mold plate (2), characterized in that, A plurality of decorative part forming cavities (3) arranged in a rectangular array are provided between the upper template (1) and the lower template (2). The upper template (1) is also provided with a combined glue injection mechanism (4) connected to the plurality of decorative part forming cavities (3). The lower template (2) is also provided with a top plate (5). The top plate (5) is provided with a plurality of separate combined ejection mechanisms (6) corresponding to the decorative part forming cavities (3).

2. The multi-cavity injection molding mold for automotive grille decorative plastic parts according to claim 1, characterized in that, The detachable combined ejection mechanism (6) includes several adapter seats (7) arranged along the length of the decorative part forming cavity (3) and fixed on the lower template (2). Each adapter seat (7) is connected to two detachable ejector rods (8) by two rotating shafts. The top of the detachable ejector rod (8) passes through the lower template (2) vertically and is flush with the upper surface of the lower template (2). The decorative part forming cavity (3) is located between the two detachable ejector rods (8), and the top of the inner side wall of the detachable ejector rod (8) is fixed with a side insert (9) that is horizontally inserted into the decorative part forming cavity (3). An ejector rod guide structure is provided between the two detachable ejector rods (8).

3. The multi-cavity injection molding mold for automotive grille decorative plastic parts according to claim 2, characterized in that, The top rod guide structure includes a horizontally arranged guide plate (10). The guide plate (10) has inwardly recessed limiting grooves (11) on both sides, which correspond to the separable top rods (8). The separable top rods (8) are slidably arranged in the limiting grooves (11). The limiting grooves (11) are also provided with a guide slope structure that moves the two separable top rods (8) away from each other when the separable top rods (8) move upward under the action of the top plate (5).

4. The multi-cavity injection molding mold for automotive grille decorative plastic parts according to claim 3, characterized in that, The guide ramp structure includes a guide ramp (12) that is inclined and disposed at the lower part of the limiting slide groove (11).

5. The multi-cavity injection molding mold for automotive grille decorative plastic parts according to claim 2, characterized in that, The side insert (9) and the separable top rod (8) are integrally formed.

6. The multi-cavity injection molding mold for automotive grille decorative plastic parts according to claim 4, characterized in that, A straight push rod (13) is also provided between two adjacent sets of separable push rods (8). The straight push rod (13) vertically penetrates the guide plate (10) and its top is connected to the decorative part forming cavity (3).

7. The multi-cavity injection molding mold for automotive grille decorative plastic parts according to claim 4, characterized in that, The guide plate (10) and the decorative part forming cavity (3) are parallel in length direction.

8. The multi-cavity injection molding mold for automotive grille decorative plastic parts according to claim 1, characterized in that, The combined glue injection mechanism (4) includes four rectangular distribution diversion plates (14). The lower side of the four diversion plates (14) is provided with a connecting plate (15) with an I-shaped cross section. The connecting plate (15) is connected to the four diversion plates (14). The cover plate on the upper side of the upper template (1) is also provided with a glue injection port connected to the connecting plate (15). Several injection tubes (16) are provided on the diversion plates (14).

9. The multi-cavity injection molding mold for automotive grille decorative plastic parts according to claim 8, characterized in that, An injection insert (17) is provided between two adjacent decorative part molding cavities (3). The injection insert (17) is provided with an injection channel (18) connected to the injection tube (16). The two ends of the injection channel (18) are respectively connected to the two decorative part molding cavities (3).

10. The multi-cavity injection molding mold for automotive grille decorative plastic parts according to claim 9, characterized in that, The glue-insertion block (17) is detachably fixed to the lower template (2) by several bolts.

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