Internal parting injection mold, tailgate exterior panel injection molding process and tailgate exterior panel

Abstract

The present application provides an inner split injection mold, a tailgate exterior panel injection molding process and a tailgate exterior panel, which are used to manufacture the tailgate exterior panel, the tailgate exterior panel includes an outer wall and two outer side walls connected to the outer wall, the two outer side walls are arranged relative to each other in the width direction of the tailgate exterior panel, and each outer side wall is arranged at an acute angle with the outer wall to form an undercut structure, and the inner split injection mold includes: a front mold; a rear mold, the rear mold and the front mold can move relative to each other to switch between a mold closing state and a mold opening state; the rear mold is provided with an inner concave cavity, the inner wall of the inner concave cavity is used to mold the outer wall and the two outer side walls; and two driving mechanisms, both of which are connected to the rear mold, and the two driving mechanisms are used to respectively resist the injection molded tailgate exterior panel, so as to drive the two outer side walls to approach each other in the width direction of the tailgate exterior panel, so that the undercut structure can be separated from the inner wall of the inner concave cavity. The mold structure is simple, the cost is low, and the injection molding quality is high.

Description

Technical Field

[0001] The present invention relates to the technical field of mold processing, and in particular to an internal parting injection mold, an injection molding process for a tailgate exterior panel, and a tailgate exterior panel. Background Art

[0002] Auto parts, such as tailgate trim, are often manufactured using injection molds. Existing injection molding methods include external parting and internal parting. When using the existing external parting method, the front and rear mold parting positions are usually located at the boundary of the exterior surface of the part, which easily leaves flash or parting marks, affecting the overall effect of the exterior surface of the part. It requires a secondary process of polishing and painting, which increases cost investment and time consumption. When using the existing internal parting method, the mold structure is complex and the cost is high.

[0003] The inventors have found that the existing tailgate exterior panel processing has the following disadvantages:

[0004] The internal parting mold is used for injection molding, and the mold structure is complex and the cost is high. Summary of the invention

[0005] The object of the present invention is to provide an inner splitting injection mold, a tailgate outer panel injection molding process and a tailgate outer panel, which can simplify the structure and reduce the cost.

[0006] The embodiment of the present invention is achieved as follows:

[0007] In a first aspect, an embodiment of the present invention provides an inner-parting injection mold for manufacturing a tailgate outer trim panel, wherein the tailgate outer trim panel includes an outer wall and two outer side walls connected to the outer wall, wherein the two outer side walls are arranged opposite to each other in a width direction of the tailgate outer trim panel, and each outer side wall is arranged at an acute angle to the outer wall to form an undercut structure, wherein the inner-parting injection mold includes:

[0008] front mold;

[0009] The rear mold can move relative to the front mold to switch between a mold closing state and a mold opening state; the rear mold is provided with a concave cavity, and the inner wall of the concave cavity is used to form the outer wall and two outer side walls;

[0010] And two driving mechanisms, both of which are connected to the rear mold, and the two driving mechanisms are used to respectively abut against the injection-molded tailgate exterior panel, so as to drive the two outer side walls to approach each other in the width direction of the tailgate exterior panel, so that the undercut structure can be separated from the inner wall of the concave cavity.

[0011] In an optional embodiment, the driving mechanism includes a linear telescopic structure, which is connected to the rear mold and is used to abut against the injection-molded tailgate exterior panel. It can drive the two outer walls closer to each other in the width direction of the tailgate exterior panel so that the undercut structure can detach from the inner wall of the concave cavity.

[0012] In an optional embodiment, the linear telescopic structure is a cylinder assembly, a hydraulic cylinder assembly or a screw transmission assembly.

[0013] In an optional embodiment, the internal parting injection mold also includes a slider, which is connected to a driving mechanism and slidingly cooperates with the rear mold to abut against the taillight mounting portion of the tailgate exterior panel; the driving mechanism is used to drive the two sliders to be relatively close, thereby driving the two outer side walls to be close to each other in the width direction of the tailgate exterior panel, so that the undercut structure can be separated from the inner wall of the concave cavity.

[0014] In an optional embodiment, an assembly protrusion is provided in the concave cavity, the assembly protrusion is provided with a slide groove, the slider and the slide groove can be slidably matched, and the slider has a first working position and a second working position that can be switched with each other; the first working position is that the slider and the assembly protrusion jointly form a molding protrusion for molding the taillight mounting part; the second working position is that the slider protrudes the assembly protrusion along the width direction of the tailgate exterior panel, so that the two outer side walls are close to each other in the width direction of the tailgate exterior panel, and the undercut structure is separated from the inner wall of the concave cavity.

[0015] In an optional embodiment, the inner-parting injection mold further includes a first ejector mechanism, which is connected to the rear mold and is used to abut against the outer wall of the tailgate exterior panel.

[0016] In an optional embodiment, the internal split injection mold also includes a top block and an elastic member, the top block and the front mold slidingly cooperate along the opening and closing direction of the mold, the top block is used to abut against the tailgate exterior panel; the elastic member is arranged on the front mold, the elastic member abuts against the top block, and is used to make the top block tend to move away from the front mold, so that the top block can drive the tailgate exterior panel to separate from the front mold.

[0017] In an optional embodiment, the inner-partition injection mold further includes a second ejector mechanism, which is connected to the front mold and is used to abut against the inner wall of the tailgate exterior panel.

[0018] In a second aspect, an embodiment of the present invention provides a tailgate exterior panel injection molding process, the tailgate exterior panel injection molding process comprising:

[0019] The tailgate exterior panel is injection molded using an internal parting method;

[0020] The two outer side walls in the width direction of the injection-molded tailgate outer trim panel are brought closer to each other;

[0021] Remove the tailgate exterior trim from the mold.

[0022] In a third aspect, an embodiment of the present invention provides a tailgate exterior panel, which is made by using the inner split injection mold of any one of the aforementioned embodiments or by using the tailgate exterior panel injection molding process of the aforementioned embodiments.

[0023] The beneficial effects of the embodiments of the present invention are:

[0024] In summary, the internal split injection mold provided in this embodiment is used for injection molding the tailgate exterior panel. After the front mold and the rear mold are closed, the fluid material enters the molding cavity formed by the front mold and the rear mold from the flow channel of the mold. After the injection molding of the tailgate exterior panel is completed, the front mold is opened. Then, both driving mechanisms are abutted against the tailgate exterior panel, and the driving mechanisms are started to make the two outer side walls of the tailgate exterior panel approach each other, so that the tailgate exterior panel shrinks and deforms in its own width direction, so that the two outer side walls can be separated from the inner wall of the concave cavity of the rear mold, and the undercut structure formed by the outer side wall and the outer wall is separated from the inner wall of the concave cavity, so as to avoid the tailgate exterior panel being stuck in the rear mold during demolding, and then the tailgate exterior panel is removed from the concave cavity of the rear mold by a manipulator. The demolding of the tailgate exterior panel is convenient and quick, and the removal operation is safe and reliable. The mold provided in this embodiment adopts an internal parting method to injection mold the tailgate exterior panel, and uses a driving mechanism to deform the tailgate exterior panel before taking it out, which is convenient for demolding and eliminates structures such as inclined ejectors and multi-stage ejectors. The entire mold structure is simple and the cost is low. The molding quality of the tailgate exterior panel is high, which reduces the subsequent manual polishing steps, reduces labor intensity, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic structural diagram of a tailgate exterior panel according to an embodiment of the present invention;

[0027] Figure 2 It is a structural schematic diagram of an internal splitting injection mold according to an embodiment of the present invention;

[0028] Figure 3 It is a partial structural schematic diagram of the front mold, the rear mold and the tailgate exterior panel of an embodiment of the present invention;

[0029] Figure 4 It is a schematic diagram of the cooperation between the rear mold and the driving mechanism of an embodiment of the present invention;

[0030] Figure 5 is an exploded schematic diagram of a rear mold and a driving mechanism according to an embodiment of the present invention;

[0031] Figure 6 for Figure 5 A schematic diagram of the structure of the local enlarged structure at A in FIG.

[0032] Figure 7 is a schematic structural diagram of a driving mechanism according to an embodiment of the present invention;

[0033] Figure 8 A schematic structural diagram of a front mold according to an embodiment of the present invention;

[0034] Fig. 9 It is a structural schematic diagram of a second ejector mechanism and a pull rod mechanism according to an embodiment of the present invention;

[0035] Fig.10 The figure is a schematic diagram of the structure of the top block, the screw and the elastic member according to an embodiment of the present invention.

[0036] icon:

[0037] 001-tailgate exterior panel; 101-outer wall; 102-outer side wall; 103-undercut structure; 104-taillight mounting portion; 100-front mold; 200-rear mold; 210-concave cavity; 220-assembly convex portion; 221-slide groove; 2211-first end; 2212-second end; 300-driving mechanism; 310-linear telescopic structure; 320-slider; 321-main body; 322-insert; 323-core; 330-fixing plate; 340-wear-resistant block; 500-second ejector pin mechanism; 600-pull rod mechanism; 700-elastic block; 800-screw; 900-elastic member. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, 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 described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0041] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0042] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only 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.

[0043] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The present embodiment provides an inner-parting injection mold for injection molding a tailgate exterior panel 001. The mold has a simple structure, is easy to demould the tailgate exterior panel 001, and has a high molding quality of the product.

[0045] See also Figure 1 And combined Figure 3 It should be noted that the tailgate outer panel 001 includes an outer wall 101 and two outer side walls 102 connected to the outer wall 101. The two outer side walls 102 are arranged opposite to each other in the width direction of the tailgate outer panel 001, and each outer side wall 102 is arranged at an acute angle with the outer wall 101 to form an undercut structure 103. Optionally, the outer side wall 102 is smoothly connected to the outer wall 101. In other words, the outer side wall 102 and the outer wall 101 are connected by an arc surface. At the same time, the tailgate outer panel 001 is also provided with two recessed taillight mounting portions 104, and the taillight mounting portions 104 are located on the outer wall 101.

[0046] In addition, the tailgate exterior panel 001 is used to be installed at the rear of the vehicle, and the width direction of the tailgate exterior panel 001 is the width direction of the vehicle, that is, Figure 1The outer side of the tailgate outer panel 001 and the outer side wall 102 form the outer surface of the vehicle after the tailgate outer panel 001 is assembled with the vehicle frame.

[0047] See also Figure 2-Figure 8 , in this embodiment, the internal split injection mold includes a front mold 100;

[0048] The rear mold 200 can move relative to the front mold 100 to switch between a mold closing state and a mold opening state; the rear mold 200 is provided with an inner concave cavity 210, and the inner wall of the inner concave cavity 210 is used to form the outer wall 101 and the two outer side walls 102;

[0049] And two driving mechanisms 300, both of which are connected to the rear mold 200, and the two driving mechanisms 300 are used to respectively abut against the injection-molded tailgate exterior panel 001, so as to drive the two outer side walls 102 to approach each other in the width direction of the tailgate exterior panel 001, so that the undercut structure 103 can be separated from the inner wall of the concave cavity 210.

[0050] In the internal split injection mold provided in this embodiment, after the front mold 100 and the rear mold 200 are closed, the fluid material enters the molding cavity formed by the front mold 100 and the rear mold 200 from the flow channel of the mold, and after the injection molding of the tailgate exterior panel 001 is completed, the front mold 100 is opened. Then, the two driving mechanisms 300 are both held against the tailgate exterior panel 001, and the driving mechanisms 300 are started, so that the two outer side walls 102 of the tailgate exterior panel 001 are brought close to each other, so that the tailgate exterior panel 001 shrinks and deforms in its own width direction, so that the two outer side walls 102 can be separated from the inner wall of the concave cavity 210 of the rear mold 200, that is, the undercut structure 103 formed by the outer side walls 102 and the outer wall 101 is separated from the inner wall of the concave cavity 210, so as to avoid the tailgate exterior panel 001 being stuck in the rear mold 200 during demoulding. Then, the tailgate exterior panel 001 is removed from the concave cavity 210 of the rear mold 200 by a robot arm, and the demoulding of the tailgate exterior panel 001 is convenient and quick, and the removal operation is safe and reliable. The mold provided in this embodiment adopts an internal parting method to injection mold the tailgate exterior panel 001, and utilizes a driving mechanism 300 to deform the tailgate exterior panel 001 before taking it out, so as to facilitate demolding and eliminate structures such as a slanted ejector and a multi-stage ejector pin. The entire mold structure is simple and the cost is low. The molding quality of the tailgate exterior panel 001 is high, and the subsequent manual polishing steps are reduced, thereby reducing labor intensity and improving production efficiency.

[0051] See also Figure 4-Figure 6 In this embodiment, optionally, two assembly protrusions 220 are provided in the concave cavity 210 of the rear mold 200, and the two assembly protrusions 220 are arranged at intervals in the length direction of the concave cavity 210, and the length direction of the concave cavity 210 is the width direction of the exterior decorative panel.

[0052] Furthermore, each assembly protrusion 220 is provided with a slide groove 221, which is a through groove. In other words, the slide groove 221 extends along the length direction of the inner concave cavity 210, and the two ends of the slide groove 221 in its own length direction extend to the corresponding surface of the rear mold 200 respectively.

[0053] See also Figure 7-10 Optionally, the driving mechanism 300 includes a linear telescopic structure 310, a slider 320, a fixed plate 330 and a wear-resistant block 340. The linear telescopic structure 310 is arranged on the rear mold 200 through the fixed plate 330, that is, the fixed plate 330 is connected to the rear mold 200, and the linear telescopic structure 310 is connected to the fixed plate 330; the wear-resistant block 340 is fixedly connected to the rear mold 200, and the slider 320 is slidably matched with the wear-resistant block 340, and a portion of the slider 320 can be located in the slide groove 221 and slidably matched with the slide groove 221. During the sliding process of the slider 320 and the slide groove 221, the slider 320 has a first working position and a second working position, and the slider 320 can slide relative to the slide groove 221 to switch between the first working position and the second working position. The telescopic end of the linear telescopic structure 310 is connected to the slider 320, which is used to drive the slider 320 to slide relative to the slide groove 221 in the length direction of the concave cavity 210.

[0054] The first working position is that the slider 320 and the assembly protrusion 220 together form a molding protrusion for molding the taillight mounting portion 104. The second working position is that the slider 320 protrudes from the assembly protrusion 220 along the width direction of the tailgate outer panel 001 (the length direction of the inner concave cavity 210), so that the two outer side walls 102 are close to each other in the width direction of the tailgate outer panel 001, and the undercut structure 103 is separated from the inner wall of the inner concave cavity 210. It should be noted that, since the slide groove 221 is a through groove, the end of the two slide grooves 221 that are close to each other is the first end 2211, and the end of the two slide grooves 221 that are away from each other is the second end 2212. When the slider 320 is located at the second working position, the slider 320 protrudes from the first end 2211 of the slide groove 221, thereby being able to squeeze the tailgate exterior panel 001 located in the concave cavity 210 from both sides toward the middle to produce shrinkage deformation, so that the undercut structure 103 of the tailgate exterior panel 001 is separated from the inner wall of the concave cavity 210 to facilitate demolding.

[0055] Optionally, the slider 320 is a split structure, and the slider 320 includes a main body 321, an insert 322, and a core 323 connected in sequence, the main body 321 is slidably matched with the wear block 340, and the core 323 is slidably matched with the slide groove 221 on the assembly protrusion 220. When the slider 320 is located at the first working position, the core 323 and the assembly protrusion 220 together form a molding protrusion for molding the taillight mounting portion 104. When the slider 320 is located at the second working position, the core 323 can be supported on the tailgate outer trim 001 and cause the tailgate outer trim 001 to shrink and deform inward in its width direction.

[0056] By setting the slider 320 as a split type, since the core body 323 cooperates with the assembly protrusion 220 to form the tailgate exterior panel 001 and transmit force to the tailgate exterior panel 001, the core body 323 has high precision requirements and is worn out relatively quickly. Therefore, when the core body 323 does not meet the use requirements, the core body 323 can be removed from the slider 320 insert 322 and replaced with a new core body 323, which saves costs.

[0057] At the same time, by arranging the wear-resistant block 340 on the rear mold 200 , the main body 321 and the wear-resistant block 340 are slidably matched, thereby reducing the wear of the main body 321 on the rear mold 200 .

[0058] In this embodiment, optionally, the linear telescopic structure 310 may be, but is not limited to, a cylinder assembly, a hydraulic cylinder assembly or a screw transmission assembly.

[0059] In this embodiment, optionally, the inner parting injection mold further includes a first ejector mechanism, a second ejector mechanism 500, a pull rod mechanism 600, an ejector block 700, a screw 800 and an elastic member 900. The first ejector mechanism is provided on the rear mold 200, and is used to abut against the outer wall 101 of the tailgate exterior panel 001. The second ejector mechanism 500 is provided on the front mold 100, and the second ejector mechanism 500 is connected to the pull rod mechanism 600, and the pull rod mechanism 600 is slidably matched with the front mold 100, and the pull rod mechanism 600 is used to reset the first ejector mechanism when the mold is closed, and to pull the first ejector mechanism when the mold is opened. The top block 700 is fixed to the front mold 100 by screws 800, and the top block 700 can slide relative to the front mold 100 in the axial direction of the screws 800. The elastic member 900 is provided on the front mold 100 and abuts against the top block 700 to make the top block 700 move away from the front mold 100. At the same time, the top block 700 cooperates with the front mold 100 to jointly form the inner surface of the tailgate exterior panel 001.

[0060] When the tailgate interior trim is formed, the top block 700 contacts part of the tailgate exterior trim 001. After the mold is opened, the elastic member 900 drives the top block 700 to move the tailgate exterior trim 001 away from the front mold 100, thereby improving the situation where the tailgate exterior trim 001 adheres to the front mold 100.

[0061] It should be understood that the elastic force of the elastic member 900 can be adjusted as needed to control the holding force, and the height of the top block 700 can be adjusted by adjusting the length of the screw 800. Optionally, in this embodiment, in the mold opening state, the top block 700 can be lifted by the elastic member 900 by about 5 mm.

[0062] It should be noted that the elastic member 900 may be a spring.

[0063] In addition, the number of the supporting mechanism composed of the supporting block 700, the elastic member 900 and the screw 800 can be multiple.

[0064] With the internal split injection mold provided in the present embodiment, after the injection molding of the tailgate exterior panel 001 is completed, since two undercut structures 103 are formed on both sides of the tailgate exterior panel 001 in its own width direction, the undercut structures 103 are abutted against the inner wall of the concave cavity 210. When the tailgate exterior panel 001 is directly taken out away from the rear mold 200 in the mold opening direction, the undercut structures 103 are stuck in the concave cavity 210, making it difficult to take out the tailgate exterior panel 001, or the tailgate exterior panel 001 is easily damaged. At this time, the two driving mechanisms 300 are operated to drive the core 323 to move. The core 323 abuts against the tailgate outer panel 001 and drives the tailgate outer panel 001 to shrink inward along its width direction. The undercut structure 103 can be separated from the inner wall of the rear mold 200, so that the tailgate outer panel 001 can be taken out in the mold opening direction. The operation is convenient, the tailgate outer panel 001 is not easily damaged, and the tailgate outer panel 001 is made by the internal parting method, with high molding quality and high appearance quality. In addition, the core 323 abuts against the taillight mounting portion 104, which is used to install the taillight, so as to shield the impact caused by the contact between the slider 320 and the tailgate outer panel 001.

[0065] It should be noted that there is also an undercut structure 103 on one side of the tailgate exterior panel 001 in the height direction (the height direction of the vehicle). The undercut structure 103 at this position can be separated from the inner wall of the rear mold 200 by the contraction of the tailgate exterior panel 001 itself, and will not affect the demoulding of the tailgate exterior panel 001.

[0066] This embodiment also provides an injection molding process for a tailgate exterior panel 001, comprising the following steps:

[0067] The tailgate exterior panel 001 is injection molded by internal parting method;

[0068] The two outer side walls 102 in the width direction of the injection-molded tailgate outer trim panel 001 are brought closer to each other;

[0069] Remove the tailgate exterior panel 001 from the mold.

[0070] The injection molding process provided in this embodiment has high molding quality for the tailgate exterior panel 001 and is easy to demould.

[0071] The present embodiment further provides a tailgate exterior panel 001, which is manufactured by using the inner split injection mold of the above embodiment or the injection molding process of the tailgate exterior panel 001 of the above embodiment, and has high molding quality.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An inner split injection mold for manufacturing a tailgate outer panel, the tailgate outer panel comprising an outer wall and two outer side walls connected to the outer wall, the two outer side walls are arranged opposite to each other in the width direction of the tailgate outer panel, and each of the outer side walls is arranged at an acute angle to the outer wall to form an undercut structure, characterized in that: The inner parting injection mold comprises: front mold; A rear mold, wherein the rear mold and the front mold can move relative to each other to switch between a mold closing state and a mold opening state; the rear mold is provided with a concave cavity, and the inner wall of the concave cavity is used to form the outer wall and the two outer side walls; and two driving mechanisms, both of which are connected to the rear mold, and are used to respectively abut against the injection-molded tailgate outer panel, thereby driving the two outer side walls to approach each other in the width direction of the tailgate outer panel, so that the undercut structure can be separated from the inner wall of the concave cavity; The driving mechanism includes a linear telescopic structure, which is connected to the rear mold and is used to abut against the injection-molded tailgate outer panel, and can drive the two outer side walls to approach each other in the width direction of the tailgate outer panel, so that the undercut structure can be separated from the inner wall of the concave cavity; The inner split injection mold further includes a first ejector mechanism, which is connected to the rear mold and is used to abut against the outer wall of the tailgate exterior panel.

2. The internal splitting injection mold according to claim 1, characterized in that: The linear telescopic structure is a cylinder assembly, a hydraulic cylinder assembly or a screw transmission assembly.

3. The internal splitting injection mold according to claim 1, characterized in that: The inner parting injection mold also includes a slider, which is connected to the driving mechanism, and the slider is slidably matched with the rear mold to be used to abut against the taillight mounting portion of the tailgate exterior panel; the driving mechanism is used to drive the two sliders to be relatively close, thereby driving the two outer side walls to be close to each other in the width direction of the tailgate exterior panel, so that the undercut structure can be separated from the inner wall of the concave cavity.

4. The internal split injection mold according to claim 3, characterized in that: An assembly convex portion is provided in the concave cavity, and the assembly convex portion is provided with a slide groove. The slider is slidably matched with the slide groove, and the slider has a first working position and a second working position that can be switched with each other; the first working position is that the slider and the assembly convex portion jointly form a molding convex portion for molding the taillight mounting portion; the second working position is that the slider protrudes from the assembly convex portion along the width direction of the tailgate exterior panel, so that the two outer side walls are close to each other in the width direction of the tailgate exterior panel, and the undercut structure is separated from the inner wall of the concave cavity.

5. The internal split injection mold according to claim 1, characterized in that: The inner-partition injection mold also includes a top block and an elastic member. The top block is slidably matched with the front mold along the opening and closing direction of the mold, and the top block is used to abut against the tailgate exterior panel; the elastic member is arranged on the front mold, and the elastic member abuts against the top block, and is used to make the top block tend to move away from the front mold, so that the top block can drive the tailgate exterior panel to separate from the front mold.

6. The inner parting injection mold according to claim 5, characterized in that: The inner split injection mold further includes a second ejector mechanism, which is connected to the front mold and is used to abut against the inner wall of the tailgate exterior panel.

7. A tailgate exterior panel injection molding process, characterized in that: Using the internal split injection mold according to any one of claims 1 to 6, the tailgate exterior panel injection molding process includes: The tailgate exterior panel is injection molded using an internal parting method; Bringing two outer side walls of the tailgate outer trim panel that has been completed by injection molding closer to each other in the width direction; The tailgate outer trim panel is removed from the mold.

8. A tailgate exterior panel, characterized in that: The tailgate exterior panel is made by using the inner split injection mold described in any one of claims 1 to 6 or by using the tailgate exterior panel injection molding process described in claim 7.

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