Injection mold and injection molding method for decorative shell of automobile rearview mirror

Abstract

The invention relates to the technical field of injection molds, in particular to an injection mold and method for an automobile rearview mirror decorative shell. In the process that an upper mold base moves downwards relative to a lower mold base, a forming male mold and a side slide move in a linkage mode; the lower mold core, the forming convex mold, the forming concave cavity and the side slide define a forming cavity for injection molding of the automobile rearview mirror decorative shell; when the upper die base moves upwards by a first distance relative to the lower die base, the forming male die can be linked to move to generate inward pre-tension force on the automobile rearview mirror decorative shell. And after the upper die base moves upwards by a second distance relative to the lower die base, the forming male die and the side slide can be linked to move, and the side slide and the automobile rearview mirror decorative shell are demolded. Compared with the prior art, the forming male die is used for providing inward pretension force for the automobile rearview mirror decorative shell, the tension force generated by the follow-up side slide and the automobile rearview mirror decorative shell is reduced, the automobile rearview mirror decorative shell cannot rebound, the scratching problem is completely eradicated, and the production yield is improved.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and in particular to an injection mold for an automotive rearview mirror decorative shell and an injection molding method for the automotive rearview mirror decorative shell. Background Technology

[0002] Car rearview mirror decorative covers are used to protect delicate internal electronic components (such as electric adjustment motors, heating wires, turn signals, and even cameras) from direct damage from sun, rain, and gravel impacts. Therefore, car rearview mirror decorative covers are an important component of the rearview mirror assembly, and are an important car exterior accessory that integrates protection, safety considerations, and personalized decoration.

[0003] Please refer to the following: Figure 1 This is the injection mold currently used by the inventor for injection molding automotive rearview mirror decorative shells. The injection mold 300 typically includes a lower mold base 3001, a lower mold core 3002, a side slide 3003, an upper mold base 3004, and an upper mold core 3005. The upper mold base and the lower mold base are closed together, and the side slide moves in conjunction with the mold, so that the lower mold core, the side slide, and the upper mold core form a cavity for injection molding automotive rearview mirror decorative shells. When the mold is opened, the upper mold base moves upward and the side slide moves in conjunction with the mold, so that the upper mold core and the side slide are demolded from the automotive rearview mirror decorative shell. Then, the ejector pin pushes the automotive rearview mirror decorative shell upward from the lower mold core and discharges it.

[0004] However, the inventors discovered in actual production that, due to the thinness of the car rearview mirror decorative shell, it tends to stick to the side slide during the demolding process of the upper mold base linkage side slide and deforms as the side slide moves. Once the side slide separates from the car rearview mirror decorative shell, the car rearview mirror decorative shell often rebounds, causing it to bounce back to the side slide, thus scratching the product and severely limiting the production yield of the car rearview mirror decorative shell.

[0005] Therefore, it is necessary to research a new technical solution to address the above problems. Summary of the Invention

[0006] In view of this, the present invention addresses the deficiencies of the prior art, and its main objective is to provide an injection mold for automotive rearview mirror decorative shells. This effectively solves the problem in the prior art where the injection mold used for injection molding automotive rearview mirror decorative shells causes the decorative shell to rebound and scratch the product during the mold opening process, thereby improving the overall production yield of automotive rearview mirror decorative shells.

[0007] This invention provides an injection mold for a car rearview mirror decorative shell, comprising: The lower mold base has a lower mold core on its top and a movable side slide; and, The upper mold base is movable up and down and mounted on top of the lower mold base. The top of the upper mold base is equipped with an upper mold core. The lower mold core is movably provided with a forming punch, and the upper mold core is provided with a forming cavity; the upper mold base is provided with a nozzle, the bottom of which extends downward to the forming cavity, and the nozzle is connected to the forming punch through a connecting component; the upper mold base is provided with a drive rod, and the side slide is provided with a drive hole for the drive rod to be inserted, the diameter of which is larger than the diameter of the drive rod. As the upper mold base moves downward relative to the lower mold base, it can move the forming punch and the side slide in conjunction, so that the lower mold core, forming punch, forming cavity and side slide surround the forming chamber for injection molding of automotive rearview mirror decorative shell. When the upper mold base moves up a first distance relative to the lower mold base, it can move the forming punch in conjunction with the mold base to generate an inward pre-tension force on the car rearview mirror decorative shell; when the upper mold base moves up a second distance relative to the lower mold base, it can move the forming punch and the side slide in conjunction with the mold base to demold the side slide from the car rearview mirror decorative shell.

[0008] The beneficial effects of the injection mold for the automotive rearview mirror decorative shell provided by the present invention are as follows: Compared with the prior art, firstly, by setting a forming punch and a side slide, and by controlling the upper mold base to move upward relative to the lower mold base by a first stroke, the displacement of the forming punch provides an inward pre-tension force for the automotive rearview mirror decorative shell; then, by driving the upper mold base to move upward by a second distance, the forming punch is kept still and the side slide is linked to the automotive rearview mirror decorative shell for demolding; such a structure can provide an inward pre-tension force for the automotive rearview mirror decorative shell through the forming punch, reduce the tension generated by the subsequent side slide and the automotive rearview mirror decorative shell, ensure that the deformation of the automotive rearview mirror decorative shell is small during demolding, and thus ensure that the automotive rearview mirror decorative shell does not rebound during demolding, eliminating the problem of scratches during demolding of the automotive rearview mirror decorative shell, thereby improving the overall production yield of the automotive rearview mirror decorative shell; Secondly, the nozzle is connected to the forming punch via a connecting component, and moves in conjunction with the drive rod and drive hole. The diameter of the drive hole is larger than the diameter of the drive rod. This structure allows the upper mold base to move upwards at both ends to coordinate with the movement of the forming punch, and then the side slide moves to demold the car rearview mirror trim shell. No additional hydraulic cylinder is required for control, which simplifies the overall structure of the injection mold and optimizes the mold opening action, thereby further improving the production efficiency of the injection mold for the car rearview mirror trim shell.

[0009] As a preferred embodiment, the forming punch includes a front punch and a rear punch. The front punch has a first connecting part on its rear side and a second connecting part on its front side. The first connecting part and the second connecting part have a first notch on their opposite sides, and the surface of the first notch has a T-slot. The connecting component includes a first connecting block located at the bottom of the nozzle and a first driving block connected to the first connecting block. The first driving block has T-shaped connecting parts on both the front and rear sides, and the T-shaped connecting parts are movably located in the T-shaped groove.

[0010] As a preferred embodiment, there are two first connecting blocks, which are located on the left and right sides of the nozzle and at the same height; The first drive block is provided with a circular clearance notch that extends through the upper surface, front side and rear side of the first drive block. The left and right sides of the circular clearance notch are provided with first mounting notches for the insertion of the first connecting block. The first mounting notches extend through the front side and rear side of the first drive block.

[0011] As a preferred embodiment, it also includes a first mounting port, which extends upward through the upper surface of the upper mold base and downward through the top of the forming cavity; The nozzle includes a nozzle body and a mounting sleeve. The mounting sleeve is fixedly installed on the upper mold base and covers the top of the first mounting port. The nozzle can be screwed together with the mounting sleeve. When the first connecting block is engaged with the first mounting notch, the nozzle can be inserted from the bottom of the first mounting port and screwed together with the mounting sleeve, and the first drive block can be partially inserted into the first mounting port.

[0012] As a preferred embodiment, the first connecting part and the second connecting part are provided with a first inclined surface at the first notch, and the front side and rear side of the first driving block are both second inclined surfaces that can be adapted to the first inclined surface; the T-shaped groove is recessed on the surface of the first inclined surface and extends along the extension direction of the first inclined surface, and the T-shaped connecting part is located at the lower part of the middle of the second inclined surface and is slidably connected to the T-shaped groove.

[0013] As a preferred embodiment, the forming cavity includes a front cavity and a rear cavity, and the front cavity and the rear cavity are separated by a first abutting portion; The side slide includes a front slide located in front of the front punch, a first right slide located to the right of the front punch, a rear slide located behind the rear punch, and a second right slide located to the right of the rear punch. When the upper mold base moves down relative to the lower mold base to close the mold, the front punch, the front slide and the first right slide, together with the front cavity, form the first molding cavity for injection molding the left decorative shell, and the rear punch, the rear slide and the second right slide form the second molding cavity for injection molding the right decorative shell.

[0014] As a preferred option, the distance between the bottom of the circular clearance notch and the bottom of the nozzle is set accordingly; After the upper mold base and the lower mold base are closed, the circular clearance notch can be flush with the upper surfaces of the first connecting part and the second connecting part, and the first abutting part abuts against the first connecting part and the second connecting part to form the glue inlet channel; one end of the glue inlet channel is connected to the circular clearance notch, and the other end is connected to the first molding cavity and the second molding cavity respectively.

[0015] As a preferred embodiment, both the front punch and the rear punch are provided with a first mounting hole penetrating their upper and lower surfaces; The first mounting hole of the front punch can be moved up and down to install the first insert and the second insert, and the first insert, the second insert and the front punch can form the first limiting notch; the first mounting hole of the rear punch can be moved up and down to install the third insert and the fourth insert, and the third insert, the fourth insert and the rear punch can form the second limiting notch. The upper mold core is provided with a first limiting protrusion for inserting into the first limiting notch and cooperating with the mounting hole of the injection-molded car rearview mirror decorative shell, and a second limiting protrusion for inserting into the second limiting notch and cooperating with the mounting hole of the injection-molded car rearview mirror decorative shell.

[0016] As a preferred embodiment, the bottom of the first insert is provided with a first connecting rod extending downward, the bottom of the second insert is provided with a second connecting rod extending downward, the bottom of the third insert is provided with a third connecting rod extending downward, and the bottom of the fourth insert is provided with a fourth connecting rod extending downward. The lower mold base is equipped with a first ejector plate that can be moved up and down. The first connecting rod, the second connecting rod, the third connecting rod, and the fourth connecting rod can all be slidably and rotatably mounted on the first ejector plate.

[0017] This invention also provides an injection molding method for an automotive rearview mirror decorative shell, applied to an injection mold for the automotive rearview mirror decorative shell; the injection molding method includes... Step 1: Provide an injection mold for the car rearview mirror decorative shell and install it on the injection molding machine, and connect the ejector mechanism of the injection molding machine to the upper mold base; Step 2: The ejector mechanism drives the upper mold base to move down relative to the lower mold base to close the mold, and moves the forming punch and side slide in conjunction, so that the forming punch, forming cavity and side slide surround the forming chamber used for injection molding of the automotive rearview mirror decorative shell. Step 3: The injection molding machine injects the hot melt slurry into the molding chamber through the nozzle; Step 4: The ejector mechanism drives the upper mold base to move up a first distance, so that the forming cavity is demolded from the car rearview mirror decorative shell and the forming punch moves in conjunction, providing an inward pre-tension force to the car rearview mirror decorative shell. Step 5: The ejector mechanism drives the upper mold base to move up a second distance, and at the same time moves the forming punch and the side slide, so that the car rearview mirror decorative shell is demolded from the side slide. Step 6: The ejector mechanism drives the first ejector plate to move and ejects the car rearview mirror decorative shell from the forming punch for unloading. Step 7: Repeat steps 2-6 to continue injection molding the car rearview mirror decorative shell.

[0018] The beneficial effects of the injection molding method for the automotive rearview mirror decorative shell provided by this invention are as follows: Compared with the prior art, by setting up an injection mold for the automotive rearview mirror decorative shell; during the mold opening process, the upper mold base is first driven to move upward by a first distance through the ejector mechanism, so that the molding cavity is demolded from the automotive rearview mirror decorative shell and the molding punch moves in conjunction, providing an inward pre-tension force to the automotive rearview mirror decorative shell; then, the ejector mechanism drives the upper mold base to move upward by a second distance, and simultaneously moves the molding punch and the side slide, increasing the space between the molding punch and the side slide and demolding the automotive rearview mirror decorative shell from the side slide; this structure can provide an inward pre-tension force to the automotive rearview mirror decorative shell through the molding punch before demolding the automotive rearview mirror decorative shell from the side slide, reducing the tension generated by the subsequent side slide and the automotive rearview mirror decorative shell, ensuring that no rebound phenomenon occurs when the automotive rearview mirror decorative shell is demolded from the side slide, eliminating the problem of scratches during demolding of the automotive rearview mirror decorative shell, thereby improving the overall production yield of the automotive rearview mirror decorative shell. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural cross-sectional view of the injection mold currently used by the inventor for injection molding automotive rearview mirror decorative shells; Figure 2 This is a three-dimensional structural schematic diagram of the injection mold for the automotive rearview mirror decorative shell provided in the embodiments of this application; Figure 3 yes Figure 2 The diagram shows the specific structure of the lower mold base of the injection mold for the automotive rearview mirror decorative shell. Figure 4 yes Figure 3 A magnified view of part A of the lower mold base of the injection mold for the car rearview mirror decorative shell shown; Figure 5 yes Figure 3 A partial cross-sectional view of the first and second connecting parts of the lower mold base of the injection mold for the automotive rearview mirror decorative shell, which are slidably connected to the first drive block. Figure 6 yes Figure 2 A schematic diagram of the specific three-dimensional structure of the upper mold base of the injection mold for the automotive rearview mirror decorative shell; Figure 7 yes Figure 2 A top view of the injection mold for the car rearview mirror trim housing shown; Figure 8 yes Figure 7 A cross-sectional view at point AA of the injection mold for the car rearview mirror decorative housing shown. Figure 9 yes Figure 7 A cross-sectional view of the injection mold at point BB of the car rearview mirror decorative housing shown. Figure 10 yes Figure 7 A cross-sectional view at the CC section of the injection mold for the car rearview mirror trim housing shown. Figure 11 yes Figure 10 A magnified view of part B of the injection mold for the car rearview mirror decorative shell shown; Figure 12 yes Figure 3 A partial three-dimensional structural diagram of the lower mold base of the injection mold for the automotive rearview mirror decorative shell is shown. Figure 13 yes Figure 3 A partial three-dimensional structural diagram of the lower mold base of the injection mold for the automotive rearview mirror decorative shell is shown. Figure 14 yes Figure 2 The diagram shows a three-dimensional structure of the left and right decorative shells produced by injection molding of the car rearview mirror decorative shell using an injection mold. Figure 15 yes Figure 14 The diagram shows a three-dimensional view of the left and right decorative shells, which are produced by injection molding of the car rearview mirror decorative shell using an injection mold.

[0021] The following are the labeling elements in the figure: 100. Injection mold for automotive rearview mirror decorative shell; 1001. First molding cavity; 1002. Second molding cavity; 1003. Glue inlet channel; 10. Lower mold base; 11. Lower mold core; 111. Front punch; 1111. First connecting part; 112. Rear punch; 1121. Second connecting part; 113. First notch; 1131. First inclined surface; 114. T-slot; 115. First mounting hole; 116. First insert; 1161. First connecting rod; 117. Second insert; 1171. Second connecting rod; 118. Third insert; 1181. Third connecting rod; 119. Fourth insert; 1191. Fourth connecting rod; 1101. First limiting notch; 1102. Second limiting notch; 12. First ejector plate; 121. First connecting seat; 122. Second connecting seat; 123. Third connecting seat; 124. Fourth connecting seat; 125. First T-slot limiting groove; 126. First limiting post; 13. Second ejector plate; 131. Snap-fitting insert; 20. Upper mold base; 21. Upper mold core; 211. Front cavity; 212. Rear cavity; 213. First abutment; 214. First limiting protrusion; 215. Second limiting protrusion; 216. First locking protrusion; 22. Nozzle; 221. Nozzle body; 222. Mounting sleeve; 223. Injection port; 23. Drive rod; 231. First rod body; 232. Second rod body; 233. Third rod body; 234. Fourth rod body; 24. First mounting port; 30. Side travel position; 301. Drive hole; 31. Front travel position; 32. Rear travel position; 33. First right travel position; 34. Second right travel position; 35. Abutting slope; 36. First locking notch; 40. Connecting component; 41. First connecting block; 42. First driving block; 4201. Second inclined surface; 421. T-shaped connecting part; 422. Circular clearance notch; 423. First mounting notch; 200. Car rearview mirror decorative shell; 2001. Left decorative shell; 2002. Right decorative shell; 2003. Mounting hole; 2004. Clip; 300, Injection mold; 3001, Lower mold base; 3002, Lower mold core; 3003, Side slide; 3004, Upper mold base; 3005, Upper mold core. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects to be solved by 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 are not intended to limit the scope of this application.

[0023] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0024] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] Please refer to the following: Figures 2 to 15 The injection mold 100 for the automotive rearview mirror decorative shell 200 provided in this application embodiment will now be described. The injection mold 100 for the automotive rearview mirror decorative shell 200 includes a lower mold base 10 and an upper mold base 20.

[0028] The lower mold base 10 has a lower mold core 11 and a movably mounted side slide 30 on its top. The upper mold base 20 is movable and mounted on the top of the lower mold base 10, and has an upper mold core 21 on its top. The lower mold core 11 has a movably mounted forming punch, and the upper mold core 21 has a forming cavity. The upper mold base 20 has a nozzle 22, the bottom of which extends downwards to the forming cavity. The nozzle 22 is connected to the forming punch via a connecting component 40. The upper mold base 20 has a drive rod 23, and the side slide has a drive hole 301 for inserting the drive rod 23. The diameter of the drive hole 301 is larger than the diameter of the drive rod 23. When the upper mold base 20 moves downwards relative to the lower mold base 10, it can simultaneously move the forming punch and... The side slide 30 moves, so that the lower mold core 11, the forming punch, the forming cavity and the side slide 30 form a molding chamber for injection molding the car rearview mirror decorative shell 200; when the upper mold base 20 moves up a first distance relative to the lower mold base 10, it can move the forming punch in conjunction with the mold to generate an inward pre-tension force on the car rearview mirror decorative shell 200; when the upper mold base 20 moves up a second distance relative to the lower mold base 10, it can move the forming punch and the side slide in conjunction with the mold and demold the side slide from the car rearview mirror decorative shell.

[0029] Specifically, compared with the prior art, firstly, by setting a forming punch and a side slide, and by controlling the upper mold base 20 to move upward relative to the lower mold base 10 by a first stroke, the displacement of the forming punch provides an inward pre-tension force for the car rearview mirror trim shell; then, by driving the upper mold base 20 to move upward by a second distance, the forming punch remains stationary and the side slide is linked to the car rearview mirror trim shell for demolding; this structure can provide an inward pre-tension force for the car rearview mirror trim shell through the forming punch, reducing the tension generated by the subsequent side slide and the car rearview mirror trim shell, ensuring that the deformation of the car rearview mirror trim shell during demolding is small, thereby ensuring that the car rearview mirror trim shell will not rebound during demolding, and eliminating the possibility of the car rearview mirror trim shell rebounding. The problem of scratches during demolding of the rearview mirror trim shell is addressed, thereby improving the overall production yield of the rearview mirror trim shell. Secondly, the nozzle 22 is connected to the forming punch through the connecting component 40, and moves in conjunction with the drive rod 23 and the drive hole 301. The diameter of the drive hole 301 is larger than the diameter of the drive rod 23. With this structure, the upper mold base 20 can move upwards at both ends to coordinate with the movement of the forming punch, and then the side slide moves to demold the rearview mirror trim shell. No additional hydraulic cylinder is required for control, which simplifies the overall structure of the injection mold and optimizes the mold opening action, further improving the production efficiency of the injection mold 100 for the rearview mirror trim shell.

[0030] In some embodiments, the forming punch includes a front punch 111 and a rear punch 112. The front punch 111 has a first connecting portion 1111 on its rear side, and the rear punch 112 has a second connecting portion 1121 on its front side. The first connecting portion 1111 and the second connecting portion 1121 have a first notch 113 on opposite sides. The surface of the first notch 113 has a T-groove 114. The connecting component 40 includes a first connecting block 41 at the bottom of the nozzle 22 and a first driving block 42 connected to the first connecting block 41. The first driving block 42 has a T-groove 421 on both its front and rear sides. The T-groove 421 is movably disposed in the T-groove 114. With this structure, when the upper mold base 20 moves upward, the first connecting block 41 and the first driving block 42 of the nozzle are connected, thereby linking the first driving block 42 to move upward. During the upward movement of the first driving block 42, the front punch 111 and the rear punch 112 can move together, thereby providing an inward pre-tension force for the car rearview mirror decorative shell through the front punch 111 and the rear punch 112.

[0031] Specifically, there are two first connecting blocks 41, which are located on the left and right sides of the nozzle 22 and at the same height; the first driving block 42 is provided with a circular clearance notch 422, which penetrates the upper surface, front side and rear side of the first driving block 42. The left and right sides of the circular clearance notch 422 are provided with first mounting notches 423 for the first connecting blocks 41 to be inserted, which penetrate the front side and rear side of the first driving block 42.

[0032] Furthermore, it also includes a first mounting port 24, which extends upward through the upper surface of the upper mold base 20 and downward through the top of the molding cavity; the nozzle 22 includes a nozzle body 221 and a mounting sleeve 222, which is fixedly mounted on the upper mold base 20 and covers the top of the first mounting port 24, and the nozzle 22 can be screwed together with the mounting sleeve 222; when the first connecting block 41 is engaged with the first mounting notch 423, the nozzle 22 can be inserted from the bottom of the first mounting port 24 and screwed together with the mounting sleeve 222, and the first driving block 42 can be partially inserted into the first mounting port 24. The first mounting port 24 includes an upper end adapted for mounting the nozzle body 221 and a lower end adapted for insertion of the first driving block 42. After the nozzle body and the first driving block are installed, the nozzle body and the first driving block can be fixed in the first mounting port.

[0033] Understandably, the mounting sleeve 222 has a glue inlet 223, which is conductively connected to the nozzle body 221; hot melt slurry is provided and injected from the glue inlet 223 through the screw mechanism of the injection molding machine, flowing through the nozzle and the glue channel into the molding cavity.

[0034] More specifically, the installation process of the nozzle and connecting component 40 is as follows: First, the first connecting block 41 of the nozzle and the first mounting notch 423 of the first driving block 42 are offset. Then, the bottom of the nozzle is inserted into the circular clearance notch 422, so that the first connecting block 41 and the first mounting notch 423 are at the same height. Next, the nozzle or the first driving block 42 is rotated so that the first connecting block 41 is engaged in the first mounting notch 423. Then, the nozzle is inserted upward from the bottom of the first mounting opening 24 and screwed together with the top of the nozzle from the top of the upper mold base 20 through the mounting sleeve 222, so that the top part of the first driving block 42 is inserted into the first notch 113, and the position of the first driving block 42 is restricted by the first notch 113, thus completing the installation of the nozzle and connecting component 40. Subsequently, the first driving block 42 can be moved in conjunction with the front punch 111 and the rear punch 112 simply by moving the upper mold base 20.

[0035] Preferably, the first connecting part 1111 and the second connecting part 1121 are provided with a first inclined surface 1131 at the first notch 113, and the front and rear sides of the first driving block 42 are both second inclined surfaces 4201 that can be adapted to the first inclined surface 1131; the T-shaped groove 114 is recessed on the surface of the first inclined surface 1131 and extends along the extension direction of the first inclined surface 1131, and the T-shaped connecting part 421 is located at the lower part of the middle of the second inclined surface 4201 and is slidably connected to the T-shaped groove 114. This structure enables the upper mold base 20 to move upwards, and through the connection of the nozzle and the first drive block 42, the front punch 111 moves backwards and forwards in conjunction with the upper mold base 20, providing an inward pre-tension force (i.e., a tension force away from the side slide 30) for the car rearview mirror decorative shell. This reduces the tension generated between the subsequent side slide and the car rearview mirror decorative shell, ensuring that the car rearview mirror decorative shell will not rebound when it is demolded from the side slide, eliminating the problem of scratches during demolding of the car rearview mirror decorative shell, and thus improving the overall production yield of the car rearview mirror decorative shell.

[0036] Since the car rearview mirror decorative shell includes a left decorative shell 2001 and a right decorative shell 2002, in order to improve the molding efficiency of the injection mold, the injection mold 100 for the car rearview mirror decorative shell provided by the present invention is a double cavity injection mold, which can mold the left decorative shell 2001 and the right decorative shell 2002 in one go by closing the upper mold base 20 and the lower mold base 10.

[0037] Specifically, the molding cavity includes a front cavity 211 and a rear cavity 212, which are separated by a first abutment 213. The side slides include a front slide 31 located in front of the front punch 111, a first right slide 33 located to the right of the front punch 111, a rear slide 32 located behind the rear punch 112, and a second right slide 34 located to the right of the rear punch 112. When the upper mold base 20 moves down relative to the lower mold base 10 to close the mold, the front punch 111, the front slide 31, and the first right slide 33, together with the front cavity 211, form a first molding cavity 1001 for injection molding the left decorative shell 2001, and the rear punch 112, the rear slide 32, and the second right slide 34, together with the second right slide 34, form a second molding chamber 1002 for injection molding the right decorative shell 2002.

[0038] Preferably, the drive rod 23 includes a first rod 231 for driving the front slide 31 to move back and forth, a second rod 232 for driving the rear slide 32 to move back and forth, a third rod 233 for driving the first right slide 33 to move, and a fourth rod 234 for driving the second right slide 34 to move. The first rod 231 is inclined forward from top to bottom, the second rod 232 is inclined backward from top to bottom, and the third rod 233 and the fourth rod 234 are inclined to the right from top to bottom. When the upper mold base 20 moves upward, the first rod 231 can drive the front slide 31 to move forward, the second rod 232 can drive the rear slide 32 to move backward, and the third rod 233 and the fourth rod 234 can drive the first right slide 33 and the second right slide 34 to move to the right.

[0039] It should be noted that the front slide 31, rear slide 32, first right slide 33, and second right slide 34 are all provided with driving holes 301; the driving hole 301 is defined as the first diameter D1, and the first rod 231 is defined as the second diameter D2, with the first diameter being larger than the second diameter; the diameters of the second rod 232, third rod 233, and fourth rod 234 are the same as the diameter of the first rod 231, so that when the upper mold base 20 moves upward by a first distance, the front slide 31, rear slide 32, first right slide 33, and second right slide 34 do not move, only driving the front punch 111 to move backward and the rear punch 112 to move forward; when the upper mold base 20 moves upward by a second distance, the first rod 231 moves in conjunction with the front slide 31, the second rod 232 moves in conjunction with the rear slide 32, the third rod 233 moves in conjunction with the first right slide 33, and the fourth rod 234 moves in conjunction with the second right slide 34.

[0040] More specifically, the front slide 31, rear slide 32, first right slide 33, and second right slide 34 are all provided with abutment slopes 35. The abutment slopes 35 can cooperate with the shovel to lock the mold, so as to ensure that the injection pressure and holding pressure will not cause the front slide 31, rear slide 32, first right slide 33, and second right slide 34 to deviate. Furthermore, the upper surface of the front slide 31, rear slide 32, first right slide 33, and second right slide 34 is provided with a first locking notch 36, and the upper mold core 21 is provided with a first locking protrusion 216. When the upper mold base 20 and the lower mold base 10 are closed, the first locking protrusion 216 can be inserted into the first locking notch 36 to further enhance the positional accuracy of the front slide 31, rear slide 32, first right slide 33, and second right slide 34, ensuring that the injection-molded car rearview mirror decorative shell meets the design requirements and improves the production yield.

[0041] More specifically, the bottom of the circular clearance notch 422 is spaced from the bottom of the nozzle 22; when the upper mold base 20 and the lower mold base 10 are closed, the circular clearance notch 422 can be flush with the upper surfaces of the first connecting part 1111 and the second connecting part 1121, and the first abutting part 213 abuts against the first connecting part 1111 and the second connecting part 1121 to form the glue inlet channel 1003; one end of the glue inlet channel 1003 is connected to the circular clearance notch 422, and the other end is connected to the first molding cavity 1001 and the second molding cavity 1002 respectively.

[0042] In other embodiments, both the front punch 111 and the rear punch 112 are provided with first mounting holes 115 penetrating their upper and lower surfaces; the first mounting hole 115 of the front punch 111 is movably mounted with a first insert 116 and a second insert 117, the first insert 116, the second insert 117 and the front punch 111 can form a first limiting notch 1101; the first mounting hole 115 of the rear punch 112 is movably mounted with a third insert 118 and a fourth insert 119, the third insert 118, the fourth insert 119 and the rear punch 112 can form a second limiting notch 1102; the upper mold core 21 is provided with a first limiting protrusion 214 for inserting into the first limiting notch 1101 and cooperating in injection molding the left decorative shell 2001 and a second limiting protrusion 215 for inserting into the second limiting notch 1102 and cooperating in injection molding the right decorative shell 2002.

[0043] Specifically, the bottom of the first insert 116 is provided with a downwardly extending first connecting rod 1161, the bottom of the second insert 117 is provided with a downwardly extending second connecting rod 1171, the bottom of the third insert 118 is provided with a downwardly extending third connecting rod 1181, and the bottom of the fourth insert 119 is provided with a downwardly extending fourth connecting rod 1191. The lower mold base 10 is equipped with a first ejector plate 12 that can be moved up and down. The first connecting rod 1161, the second connecting rod 1171, the third connecting rod 1181, and the fourth connecting rod 1191 can all be slidably and rotatably mounted on the first ejector plate 12. When the upper mold base 20 completes the upward movement of the second distance, the first ejector plate 12 moves upward, which in turn moves the first insert 116, the second insert 117, the third insert 118, and the fourth insert 119 upward, so as to eject the left decorative shell 2001 from the front punch 111 and eject the right decorative shell 2002 from the rear punch 112.

[0044] More specifically, the first ejector plate 12 is fixedly mounted with a first connecting seat 121, a second connecting seat 122, a third connecting seat 123, and a fourth connecting seat 124. Each of the first connecting seat 121, second connecting seat 122, third connecting seat 123, and fourth connecting seat 124 is provided with a first T-shaped limiting groove 125. The bottom of each of the first connecting rod 1161, second connecting rod 1171, third connecting rod 1181, and fourth connecting rod 1191 is provided with a first limiting post 126. The first limiting post 126 is slidably and rotatably disposed within the first T-shaped limiting groove 125. When the front punch 111 moves backward... The first limiting post 126 of the first connecting rod 1161 and the second connecting rod 1171 can slide from the front end to the rear end of the first T-shaped limiting groove 125; when the rear punch 112 moves forward, the first limiting post 126 of the third connecting rod 1181 and the fourth connecting rod 1191 can slide from the rear end to the front end of the first T-shaped limiting groove 125, thereby compensating for the movement position of the front punch 111 and the rear punch 112, so as to control the subsequent ejection of the left decorative shell 2001 by the first insert 116 and the second insert 117 and the ejection of the right decorative shell 2002 by the third insert 118 and the fourth insert 119.

[0045] It should be noted that the first connecting rod 1161 and the second connecting rod 1171 are inclined backward from bottom to top, while the third connecting rod 1181 and the fourth connecting rod 1191 are inclined forward from bottom to top. This ensures that when the first ejector plate 12 moves upward, the first connecting rod 1161, the second connecting rod 1171, the third connecting rod 1181, and the fourth connecting rod 1191 will not get stuck, thereby improving the reliability of the injection mold 100 for the automotive rearview mirror decorative shell.

[0046] In other embodiments, a plurality of snap-fit ​​molding inserts 131 are also included. The snap-fit ​​molding inserts 131 can cooperate with the front punch 111 and the rear punch 112 to injection mold different types of snaps 2004 into the inner side of the left decorative shell 2001 and the right decorative shell 2002. The snap-fit ​​molding inserts 131 move up and down in linkage with the second ejector plate 13. The first ejector plate 12 and the second ejector plate 13 are stacked on top of each other. The connection method between the snap-fit ​​molding inserts 131 and the second ejector plate 13 is the same as the connection method between the first insert 116 and the first ejector plate 12, and will not be described in detail here.

[0047] It should be noted that the lower mold base 10 and the upper mold base 20 are provided with guide rods at one of the four corners and guide holes at the other four corners. The guide rods are inserted into the guide holes to restrict the upper mold base 20 to move only up and down relative to the lower mold base 10, thereby ensuring the reliability of the mold closing and opening of the upper mold base 20 and the lower mold base 10.

[0048] This invention also provides an injection molding method for a car rearview mirror decorative shell, applied to an injection mold 100 for the car rearview mirror decorative shell, the injection molding method comprising: Step 1: Provide an injection mold 100 for the car rearview mirror decorative shell and install it on the injection molding machine, and connect the ejector mechanism of the injection molding machine to the upper mold base 20; Step 2: The ejector mechanism drives the upper mold base 20 to move down relative to the lower mold base 10 to close the mold, and moves the forming punch and the side slide in conjunction, so that the forming punch, the forming cavity and the side slide form the forming chamber for injection molding the automotive rearview mirror decorative shell 200. Step 3: The injection molding machine injects the hot melt slurry nozzle 22 into the molding chamber; Step 4: The ejector mechanism drives the upper mold base 20 to move upward by a first distance, so that the forming cavity is demolded from the car rearview mirror decorative shell 200 and the forming punch moves in conjunction, providing an inward pre-tension force to the car rearview mirror decorative shell 200. Step 5: The ejector mechanism drives the upper mold base 20 to move up a second distance, and at the same time moves the forming punch and the side slide, so that the car rearview mirror decorative shell 200 is demolded from the side slide. Step 6: The ejector mechanism drives the first ejector plate 12 to move and ejects the car rearview mirror decorative shell 200 from the forming punch for unloading. Step 7: Repeat steps 2-6 to continuously injection mold the car rearview mirror decorative shell 200.

[0049] Specifically, compared with existing technologies, by setting up an injection mold for the car rearview mirror trim shell, during the mold opening process, the upper mold base 20 is first moved upward by a first distance through an ejector mechanism, causing the molding cavity to detach from the car rearview mirror trim shell and the molding punch to move in conjunction, providing an inward pre-tension force to the car rearview mirror trim shell; then, the ejector mechanism drives the upper mold base 20 to move upward by a second distance, and simultaneously moves the molding punch and the side slide, increasing the space between the molding punch and the side slide and allowing the car rearview mirror trim shell to detach from the side slide; this structure can provide an inward pre-tension force to the car rearview mirror trim shell through the molding punch before the car rearview mirror trim shell detaches from the side slide, reducing the tension generated by the subsequent side slide and the car rearview mirror trim shell, ensuring that there is no rebound phenomenon when the car rearview mirror trim shell detaches from the side slide, eliminating the problem of scratches when the car rearview mirror trim shell detaches from the mold, thereby improving the overall production yield of the car rearview mirror trim shell.

[0050] More specifically, due to the use of a double-cavity injection mold, after the upper mold base 20 closes relative to the lower mold base 10, it can form a first molding cavity 1001 for injection molding the left decorative shell 2001 by linking the front punch 111, the front slide 31 and the first right slide 33 with the front cavity 211, and form a second molding cavity 1002 for injection molding the right decorative shell 2002 by linking the rear punch 112, the rear slide 32 and the second right slide 34. Thus, the upper mold base 20 and the lower mold base 10 are closed to perform one-time injection molding of the left decorative shell 2001 and the right decorative shell 2002.

[0051] Furthermore, in step 4, the upper mold base 20 moves upward by a first distance of 4mm, and simultaneously the front punch 111 moves backward by 1.5mm and the rear punch 112 moves forward by 1.5mm, so that the front punch 111 provides an inward pre-tension force to the left decorative shell 2001 and the rear punch 112 provides an inward pre-tension force to the right decorative shell 2002.

[0052] More specifically, when the upper mold base 20 has moved up a first distance, it continues to move up a second distance of 10 cm. During this upward movement, the front punch 111 moves backward and the rear punch 112 moves forward. At the same time, the first rod 231 moves forward in conjunction with the front slide 31, the second rod 232 moves backward in conjunction with the rear slide 32, the third rod 233 moves to the right in conjunction with the first right slide 33, and the fourth rod 234 moves to the right in conjunction with the second right slide 34. This increases the demolding space of the left decorative shell 2001 and the right decorative shell 2002, thereby further preventing scratches from occurring during the demolding process of the left decorative shell 2001 and the right decorative shell 2002.

[0053] Specifically, in step 6, the ejector mechanism can simultaneously drive the first ejector plate 12 and the second ejector plate 13 to move upward, and through the first insert 116, the second insert 117, the third insert 118, the fourth insert 119 and the snap-fit ​​forming insert 131, they simultaneously extend upward from the front punch 111 and the rear punch 112, so as to eject the left decorative shell 2001 from the front punch 111 and the right decorative shell 2002 from the rear punch 112.

[0054] The above are merely preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for explaining the principles of the present invention and should not be construed as limiting the scope of protection of the present invention in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention, as well as other specific embodiments of the present invention that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of the present invention.

Claims

1. An injection mold for a decorative shell for a car rearview mirror, comprising: The lower mold base (10) has a lower mold core (11) on its top and a movable side slide; and, An upper mold base (20) is movable up and down and mounted on top of a lower mold base (10). An upper mold core (21) is provided on the top of the upper mold base (20). Its characteristic is that... The lower mold core (11) is movably provided with a forming punch, and the upper mold core (21) is provided with a forming cavity; the upper mold base (20) is provided with a nozzle (22), the bottom of the nozzle (22) extends downward to the forming cavity, and the nozzle (22) is connected to the forming punch through a connecting component (40); the upper mold base (20) is provided with a drive rod (23), and the side slide is provided with a drive hole (301) for the drive rod (23) to be inserted, the diameter of the drive hole (301) being larger than the diameter of the drive rod (23); As the upper mold base (20) moves downward relative to the lower mold base (10), it can move the forming punch and the side slide in conjunction, so that the lower mold core (11), the forming punch, the forming cavity and the side slide surround the forming chamber for injection molding of the car rearview mirror decorative shell (200). When the upper mold base (20) moves up a first distance relative to the lower mold base (10), it can move the forming punch in conjunction with the movement to generate an inward pre-tension force on the car rearview mirror decorative shell (200); when the upper mold base (20) moves up a second distance relative to the lower mold base (10), it can move the forming punch and the side slide in conjunction with the movement to demold the side slide from the car rearview mirror decorative shell (200).

2. The injection mold for the automotive rearview mirror decorative shell according to claim 1, characterized in that, The forming punch includes a front punch (111) and a rear punch (112). The front punch (111) has a first connecting part (1111) on its rear side, and the rear punch (112) has a second connecting part (1121) on its front side. The first connecting part (1111) and the second connecting part (1121) have a first notch (113) on their opposite sides. The surface of the first notch (113) has a T-slot. The connecting component (40) includes a first connecting block (41) located at the bottom of the nozzle (22) and a first driving block (42) connected to the first connecting block (41). The first driving block (42) has a T-shaped connecting part (421) on both the front and rear sides. The T-shaped connecting part (421) is movably located in the T-shaped groove.

3. The injection mold for the automotive rearview mirror decorative shell according to claim 2, characterized in that, There are two first connecting blocks (41), which are located on the left and right sides of the nozzle (22) and at the same height; The first drive block (42) is provided with a circular clearance notch (422), which penetrates the upper surface, front side and rear side of the first drive block (42). The left and right sides of the circular clearance notch (422) are provided with first installation notches (423) for the first connecting block (41) to be inserted, and the first installation notches (423) penetrate the front side and rear side of the first drive block (42).

4. The injection mold for the automotive rearview mirror decorative shell according to claim 3, characterized in that, It also includes a first mounting port (24), which extends upward through the upper surface of the upper mold base (20) and downward through the top of the forming cavity; The nozzle (22) includes a nozzle body (221) and a mounting sleeve (222). The mounting sleeve (222) is fixedly installed on the upper mold base (20) and covers the top of the first mounting port (24). The nozzle (22) can be screwed together with the mounting sleeve (222). When the first connecting block (41) is engaged with the first mounting notch (423), the nozzle (22) can be inserted from the bottom of the first mounting port (24) and screwed together with the mounting sleeve (222), and the first drive block (42) can be partially inserted into the first mounting port (24).

5. The injection mold for the automotive rearview mirror decorative housing according to any one of claims 2-4, characterized in that, The first connecting part (1111) and the second connecting part (1121) are provided with a first inclined surface (1131) at the first notch (113). The front side and the rear side of the first driving block (42) are both second inclined surfaces (4201) that can be adapted to the first inclined surface (1131). The T-shaped groove (114) is recessed on the surface of the first inclined surface (1131) and extends along the extension direction of the first inclined surface (1131). The T-shaped connecting part (421) is located in the lower part of the middle of the second inclined surface (4201) and is slidably connected to the T-shaped groove (114).

6. The injection mold for the automotive rearview mirror decorative housing according to claim 5, characterized in that, The forming cavity includes a front cavity (211) and a rear cavity (212), and the front cavity (211) and the rear cavity (212) are separated by a first abutment (213); The side slides include a front slide (31) located in front of the front punch (111), a first right slide (33) located to the right of the front punch (111), a rear slide (32) located behind the rear punch (112), and a second right slide (34) located to the right of the rear punch (112). When the upper mold base (20) moves down relative to the lower mold base (10) and closes the mold, the front punch (111), the front slide (31) and the first right slide (33) together with the front cavity (211) form the first molding cavity (1001) for injection molding of the left decorative shell (2001), and the rear punch (112), the rear slide (32) and the second right slide (34) together form the second molding cavity (1002) for injection molding of the right decorative shell (2002).

7. The injection mold for the automotive rearview mirror decorative housing according to claim 6, characterized in that, The distance between the bottom of the circular clearance notch (422) and the bottom of the nozzle (22) is set; When the upper mold base (20) and the lower mold base (10) are closed, the circular clearance notch (422) can be flush with the upper surfaces of the first connecting part (1111) and the second connecting part (1121), and the first abutting part (213) abuts against the first connecting part (1111) and the second connecting part (1121) to form the glue inlet channel (1003); one end of the glue inlet channel (1003) is connected to the circular clearance notch (422), and the other end is connected to the first molding cavity (1001) and the second molding cavity (1002) respectively.

8. The injection mold for the decorative shell of a car rearview mirror according to claim 2, 3, 4, 6, or 7, characterized in that, Both the front punch (111) and the rear punch (112) are provided with a first mounting hole (115) that penetrates their upper and lower surfaces. The first mounting hole (115) of the front punch (111) is movable up and down to mount the first insert (116) and the second insert (117). The first insert (116), the second insert (117) and the front punch (111) can form a first limiting notch (1101). The first mounting hole (115) of the rear punch (112) is movable up and down to mount the third insert (118) and the fourth insert (119). The third insert (118), the fourth insert (119) and the rear punch (112) can form a second limiting notch (1102). The upper mold core (21) is provided with a first limiting protrusion (214) for inserting the first limiting notch (1101) and cooperating with the mounting hole (2003) for injection molding the left decorative shell (2001) and a second limiting protrusion (215) for inserting the second limiting notch (1102) and cooperating with the mounting hole (2003) for injection molding the right decorative shell (2002).

9. The injection mold for the automotive rearview mirror decorative housing according to claim 8, characterized in that, The first insert (116) has a downwardly extending first connecting rod (1161) at the bottom, the second insert (117) has a downwardly extending second connecting rod (1171) at the bottom, the third insert (118) has a downwardly extending third connecting rod (1181) at the bottom, and the fourth insert (119) has a downwardly extending fourth connecting rod (1191) at the bottom. The lower mold base (10) is equipped with a first ejector plate (12) that can be moved up and down. The first connecting rod (1161), the second connecting rod (1171), the third connecting rod (1181) and the fourth connecting rod (1191) can be slidably and rotatably installed on the first ejector plate (12).

10. An injection molding method for a car rearview mirror decorative shell (200), applied to the injection mold of the car rearview mirror decorative shell according to any one of claims 1-9, characterized in that, Injection molding methods include Step 1: Provide an injection mold for the car rearview mirror decorative shell and install it on the injection molding machine, and connect the ejector mechanism of the injection molding machine to the upper mold base (20); Step 2: The ejector mechanism drives the upper mold base (20) to move down relative to the lower mold base (10) to close the mold, and moves the forming punch and side slide in conjunction, so that the forming punch, forming cavity and side slide surround the forming chamber for injection molding of the car rearview mirror decorative shell (200). Step 3: The injection molding machine injects the hot melt slurry into the molding chamber through the nozzle (22); Step 4: The push rod mechanism drives the upper mold base (20) to move up a first distance, so that the molding cavity is demolded from the car rearview mirror decorative shell (200) and the molding punch moves in conjunction, providing an inward pre-tension force to the car rearview mirror decorative shell (200); Step 5: The ejector mechanism drives the upper mold base (20) to move up a second distance, and at the same time moves the forming punch and the side slide, so that the car rearview mirror decorative shell (200) is demolded from the side slide; Step 6: The ejector mechanism drives the first ejector plate (12) to move and ejects the car rearview mirror decorative shell (200) from the forming punch. Step 7: Repeat steps 2-6 to continuously injection mold the car rearview mirror decorative shell (200).

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