Mold for injection molding of outer frame of automobile rearview mirror

Abstract

The utility model relates to the technical field of injection molding molds, in particular to a mold for injection molding of an outer frame of an automobile rearview mirror, which comprises a front mold and a rear mold, a molding cavity matched with the outer frame of the automobile rearview mirror is formed between the front mold and the rear mold, and a front mold tunnel is arranged on one side of the front mold, which is positioned on the molding cavity; a two-way sliding rail is arranged on the inner side wall of the front mold tunnel, the front mold tunnel is slidably connected with a dog-leg slide mechanism in the direction of the two-way sliding rail, the dog-leg slide mechanism comprises a tunnel sliding block, a bent pin and a locking rod, the two sides of the tunnel sliding block are slidably connected to the two-way sliding rail, one side of the front mold tunnel sliding block is connected with the forming cavity, the bent pin is of a V-shaped structure, and the locking rod is connected with the front mold tunnel sliding block. One end of the bent pin is fixed on the front mold through a locking rod, and the other end of the bent pin penetrates through the tunnel sliding block and extends to the rear mold; according to the utility model, the dog-leg slide mechanism is adopted to carry out core-pulling demolding on the large-area inverted buckle on the outer side surface of the dog-leg slide mechanism, so that the problems of breakage, breakage and the like of the annular inverted buckle structure are effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding molds, in particular to a mold used for injection molding of an automobile rearview mirror outer frame. Background Art

[0002] A rearview mirror is a crucial component of a car's exterior trim, located on both sides. It's one of the most important exterior components. It allows the driver to observe road conditions while driving, effectively acting as the driver's eyes. A rearview mirror typically consists of a mirror ring, base, housing, bracket, and rotating shaft.

[0003] Among them, the mirror shell is the rearview mirror frame, and the rearview mirror frame is generally a plastic part. When making the rearview mirror frame, injection molding is usually adopted. However, due to the complex shape of the rearview mirror frame, the appearance clip line requirements are extremely high, and there is a large area of undercut on the outer side of the rearview mirror frame and six annular undercuts on the inner side. The undercuts are numerous and large in area, which causes general molds to easily produce spots and gate marks when injecting them. At the same time, when demolding, general molds usually use ejector pins to eject the mold. This method will not only cause defects such as shrinkage depressions, weld marks, and flash on the workpiece, but also cause the annular undercut structure to break and shatter. Utility Model Content

[0004] In order to solve the technical defects raised in the above-mentioned background technology, the purpose of the present utility model is to provide a mold for injection molding of the outer frame of a car rearview mirror. The mold adopts a dogleg sliding mechanism to pull the core and demould the large-area undercut on its outer surface, and also sets a slanted top inner side core pulling mechanism to eject the annular undercut on its inner side, thereby effectively preventing the annular undercut structure from breaking, breaking and other problems.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A mold for injection molding of an automobile rearview mirror frame comprises a front mold and a rear mold, wherein a molding cavity adapted to the automobile rearview mirror frame is formed between the front mold and the rear mold, wherein the front mold is provided with a front mold tunnel on one side of the molding cavity, a bidirectional slide rail is provided on the inner side wall of the front mold tunnel, and the front mold tunnel is connected to a dogleg sliding mechanism in a sliding direction along the bidirectional slide rail, wherein the dogleg sliding mechanism comprises a tunnel slider, a bent pin and a locking rod, wherein both sides of the tunnel slider are slidably connected to the bidirectional slide rail, and one side of the front mold tunnel slider is connected to the molding cavity, the bent pin is in a V-shaped structure, and one end of the bent pin is fixed to the front mold by the locking rod, and the other end passes through the tunnel slider and extends to the rear mold.

[0007] Preferably, an inclined top inner core pulling mechanism is provided at the inner bottom end of the molding cavity, and the inclined top inner core pulling mechanism includes a straight push rod assembly and an inclined push rod assembly. The straight push rod assemblies are provided in multiple groups, and the multiple groups of straight push rod assemblies are evenly arranged between the molding cavity and the rear mold; the inclined push rod assemblies are symmetrically arranged in the middle position of the molding cavity, and the inclined push rod assemblies are inclined along the center direction of the molding cavity.

[0008] Preferably, the straight push rod assembly includes a rear mold ejector plate, a rear mold ejector and a guide column. There are multiple rear mold ejector plates, and the multiple rear mold ejector plates are stacked and arranged in the rear mold. The rear mold ejectors are evenly arranged along the four sides of the molding cavity, and one end of the rear mold ejector is fixedly connected to the rear mold ejector plate, and the other end abuts against the bottom end of the molding cavity; a return spring is sleeved on the outer surface of the guide column.

[0009] Preferably, the oblique push rod assembly includes an oblique push rod, an oblique pin slider and an oblique pin guide rail. The bottom end of the oblique push rod is slidably connected to the oblique pin slider by being arranged on a pulley, and the inclination angle of the oblique push rod is 5°-15°; the oblique pin slider is fixedly connected to the rear mold ejector plate by screws, and the oblique pin slider is provided with a positioning groove adapted to the sliding of the pulley; the oblique pin guide rail is connected to the top end of the oblique push rod, and a positioning protrusion protrudes outward on one side of the oblique pin guide rail, and the positioning protrusion abuts against the side wall of the molding cavity.

[0010] Preferably, the front mold includes a front mold base and a front mold plate, a runner for pouring is provided at the top of the front mold base, and a pouring flow channel connected to the molding cavity and the runner gate is provided in the front mold base and the front mold plate; a locking plate for locking the front mold and the rear mold is provided on one side of the front mold plate.

[0011] Preferably, the rear mold includes a rear mold base, a mold foot gasket and a rear mold plate, the mold foot gasket is symmetrically arranged between the rear mold base and the rear mold plate, and the gap between the two mold foot gaskets forms an area for installing a straight push rod assembly.

[0012] Preferably, a plurality of water cooling pipes are provided in the front template and the rear template, the plurality of water cooling pipes are distributed in a crisscross pattern, and the flow direction of the water cooling pipes is the same as the material flow direction.

[0013] Preferably, a limit screw for limiting the sliding distance of the tunnel slider is provided on the top of the front mold tunnel.

[0014] In summary, the beneficial effects of the present invention are as follows:

[0015] The mold of the utility model is used to demould the automobile rearview mirror frame by arranging a dogleg sliding mechanism, wherein the tunnel slider can slide along the bidirectional slide rail when the bending pin is pulled out, and the bending pin and the tunnel slider have a relative movement trend, thereby enabling the tunnel slider to disengage from the undercut in two forms of movement along the mold opening direction and the horizontal direction; and can adapt to the extraction of concave and convex surfaces with a shallow side forming depth and a large area, and effectively complete the core pulling of the front mold tunnel for the undercut with a large area on the outside of the rearview mirror frame; in addition, the core pulling and pushing actions are completed simultaneously, so that it can be demoulded for the annular undercut on the inside of the rearview mirror frame, which is beneficial to improving the special circumstances of overflow and exhaust conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a mold for injection molding of an automobile rearview mirror frame according to the present invention;

[0017] Figure 2 This is a cross-sectional view of a mold for injection molding of an automobile rearview mirror frame according to the present invention;

[0018] Figure 3 The utility model is a half-section view of a mold for injection molding of an automobile rearview mirror outer frame.

[0019] Description of reference numerals in the figures:

[0020] 1. Front mold; 11. Front mold base; 111. Runner gate; 112. Pouring runner; 12. Front mold plate; 13. Locking plate; 2. Back mold; 21. Back mold base; 22. Mold foot gasket; 23. Back mold plate; 3. Molding cavity; 4. Front mold tunnel; 41. Bidirectional slide rail; 42. Limit screw; 5. Dogleg sliding mechanism; 51. Tunnel slider; 52. Bend pin; 53. Locking rod; 6. Straight push rod assembly; 61. Back mold ejector plate; 62. Back mold ejector; 63. Guide column; 64. Return spring; 7. Oblique push rod assembly; 71. Oblique push rod; 72. Oblique pin slider; 721. Sliding groove; 73. Oblique pin guide rail; 731. Positioning bump; 8. Water cooling pipe. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0022] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which 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 orientation, be constructed and operated in a specific orientation. Therefore, the above terms cannot be understood as limiting the present invention.

[0023] In the description of this utility model, if the word "several" or "several" is used, it means one or more, and "more" means two or more. "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of the words "first," "second," and "third" is only for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.

[0024] The following is combined with Figure 1-3 , an embodiment of the utility model of a mold for injection molding of an automobile rearview mirror frame is further described in detail.

[0025] A mold for injection molding of the outer frame of a rearview mirror of an automobile, such as Figure 1 、 2 As shown, it includes a front mold 1 and a rear mold 2, and a molding cavity 3 adapted to the outer frame of the automobile rearview mirror is formed between the front mold 1 and the rear mold 2. The front mold 1 is located on one side of the molding cavity 3 and is provided with a front mold 1 tunnel. A two-way slide rail 41 is provided on the inner side wall of the front mold 1 tunnel, and the front mold 1 tunnel is slidably connected to the dogleg sliding mechanism 5 along the direction of the two-way slide rail 41. The dogleg sliding mechanism 5 includes a tunnel slider 51, a bent pin 52 and a locking rod 53. Both sides of the tunnel slider 51 are slidably connected to the two-way slide rail 41, and one side of the front mold 1 tunnel slider 51 is connected to the molding cavity 3. The bent pin 52 is a V-shaped structure, and one end of the bent pin 52 is fixed to the front mold 1 through the locking rod 53, and the other end passes through the tunnel slider 51 and extends to the rear mold 2.

[0026] Specifically, in order to enable the annular undercuts on the inner and outer sides of the automobile rearview mirror frame to be demolded more smoothly during the injection molding process, the width of the tunnel slider 51 is not less than 30 mm, and the length of the tunnel slider 51 is not less than the height of the tunnel slider 51, so as to ensure that the tunnel slider 51 slides stably and smoothly along the two-way slide rail 41 in the tunnel of the front mold 1 when opening and closing the mold. At the same time, the length of the tunnel of the front mold 1 should not be greater than one-quarter of the length of the slider. The tunnel slider 51 must remain in the tunnel of the front mold 1 after the core pulling and demolding are completed. For this purpose, a limit screw 42 is provided on the top of the tunnel of the front mold 1 for limiting the sliding distance of the tunnel slider 51 to ensure that the tunnel slider 51 is reset safely and reliably.

[0027] It is worth noting that when the dogleg sliding mechanism 5 performs lateral parting and core pulling, the bent pin 52 acts on the tunnel slider 51, causing the bent pin 52 to push the tunnel slider 51 outward. Since the bent pin 52 is a V-shaped structure, its top end is fixed and limited by the locking rod 53, and its bottom end abuts against the rear mold 2, and the bent pin 52 passes through the center of the tunnel slider 51. During the pushing process, the tunnel slider 51 is driven to move outward along the direction of the two-way slide rail 41, causing the tunnel slider 51 to move backward and be limited and fixed at the maximum point by the limit screw 42, thereby preventing the tunnel slider 51 from falling. After completing the core pulling action, the injection molded product will be ejected by the inclined core pulling mechanism.

[0028] In this embodiment, if Figure 3 As shown, an inclined top inner core pulling mechanism is provided at the inner bottom end of the molding cavity 3, and the inclined top inner core pulling mechanism includes a straight push rod assembly 6 and an inclined push rod 71 assembly 7. There are multiple groups of straight push rod assemblies 6, and the multiple groups of straight push rod assemblies 6 are evenly arranged between the molding cavity 3 and the rear mold 2; the inclined push rod 71 assembly 7 is symmetrically arranged in the middle position of the molding cavity 3, and the inclined push rod 71 assembly 7 is inclined along the center direction of the molding cavity 3.

[0029] Specifically, the straight push rod assembly 6 includes a rear mold 2 ejector plate, a rear mold 2 ejector and a guide column 63. There are multiple rear mold 2 ejector plates, and multiple rear mold 2 ejector plates are superimposed and arranged in the rear mold 2. Among them, in the utility model, there are three rear mold 2 ejector plates, and the three rear mold 2 ejector plates can adjust the ejection distance. The rear mold 2 ejectors are evenly arranged around the molding cavity 3, and one end of the rear mold 2 ejector is fixedly connected to the rear mold 2 ejector plate, and the other end abuts against the bottom end of the molding cavity 3. Through the action of the rear mold 2 ejector, the position of the injection molded product without undercut can be directly ejected, thereby accelerating its demoulding efficiency; a return spring 64 is sleeved on the outer surface of the guide column 63. The return spring 64 is used to reduce shock and buffer when the front mold 1 and the rear mold 2 are opening or closing the mold, and can also effectively assist the guide column 63 in guiding.

[0030] In this embodiment, the inclined push rod 71 assembly 7 includes an inclined push rod 71, an inclined pin slider 72 and an inclined pin guide rail 73. The bottom end of the inclined push rod 71 is slidably connected to the inclined pin slider 72 by being set on a pulley, and the inclination angle of the inclined push rod 71 is 5°-15°; the inclined pin slider 72 is fixedly connected to the ejector plate of the rear mold 2 by screws, and the inclined pin slider 72 is provided with a sliding groove 721 adapted to the sliding of the pulley; the inclined pin guide rail 73 is connected to the top end of the inclined push rod 71, and a positioning protrusion 731 protrudes outward on one side of the inclined pin guide rail 73, and the positioning protrusion 731 abuts against the side wall of the molding cavity 3.

[0031] Specifically, the bottom end of the inclined rod can slide left and right along the row groove 721. When the inner annular buckle of the injection molded product is demolded, the inclined pin guide rail 73 on the inclined push rod 71 is used to abut against the side wall of the molding cavity 3. After the injection molding is completed, the slider on the annular buckle can be disengaged along the direction of the annular buckle by moving the inclined push rod 71, and then the core can be pulled out to avoid the annular buckle from breaking or breaking during the core pulling process.

[0032] In this embodiment, the front mold 1 includes a front mold base and a front mold plate. A runner 111 for pouring is provided at the top of the front mold base. A pouring channel 112 connected to the molding cavity 3 and the runner 111 is provided in the front mold base and the front mold plate; a locking plate 13 for locking the front mold 1 and the rear mold 2 is provided on one side of the front mold plate.

[0033] Specifically, a concave profile of the surface of the face-shaped plastic part is opened on the fixed template, so that when it is spliced with the rear mold 2, a molding cavity 3 is formed, which is convenient for injecting plastic liquid, wherein the runner 111 is a section of the channel in the mold that connects the injection molding machine nozzle to the branch channel or the cavity; its top is concave to connect with the nozzle, and the diameter of the runner 111 is slightly larger than the nozzle diameter to avoid overflow and prevent the two from being blocked due to inaccurate connection. At the same time, the diameter of the runner 111 is expanded inward at an angle of 3°-5°. The purpose of this design is to facilitate the demoulding of runner excess; a plurality of runner pipes are connected to the bottom end of the runner gate 111, and one end of the runner pipe is connected to the molding cavity 3 to quickly transport the plastic glue to the molding cavity 3 to complete the injection molding.

[0034] In this embodiment, the rear mold 2 includes a rear mold 2 base, a mold foot gasket 22 and a rear mold 2 plate. The mold foot gasket 22 is symmetrically arranged between the rear mold 2 base and the rear mold 2 plate, and the gap between the two mold foot gaskets 22 forms an area for installing the straight push rod assembly 6.

[0035] Specifically, in order to enable the rear mold 2 to be installed quickly and accurately on the injection molding machine, a positioning hole is opened on the rear base, and the positioning hole is used to match and connect with the positioning mechanism of the injection molding machine, so that it can be stably fixed on the injection molding machine to complete injection molding, and the mold foot gasket 22 is used to adjust the height of the mold closure and place the ejector pin rear mold 2 plate to form the ejection space required for the straight push rod assembly 6; and the locking plate 13 is provided on one side of the rear mold 2 to cooperate with the front mold 1, so as to ensure that when the mold is closed, the front mold 1 and the rear mold 2 are locked, and the splicing gap between them is tightly clamped to avoid the gap affecting the injection molding effect.

[0036] In this embodiment, a plurality of water cooling pipes 8 are provided in the front mold plate 1 and the rear mold plate 2. The plurality of water cooling pipes 8 are arranged in a crisscross pattern, and the flow direction of the water cooling pipes 8 is the same as the material flow direction.

[0037] Since the automobile rearview mirror frame is an exterior decoration part, the appearance requirements are extremely high. In order to ensure that the injection molded parts are molded quickly during the injection molding process, a temperature control system is set inside the mold. The quality of the temperature control system has a great influence on the molding cycle of the mold and the molding quality of the plastic parts. Therefore, the temperature control system usually uses a water-cooling pipe 8 for cooling. One of the design principles of the water-cooling pipe 8 is that the distance from the cavity surface should be roughly equal to achieve a roughly balanced temperature in all parts of the mold cavity; in the utility model, four groups of water channels are designed in the front mold 1 and the rear mold 2, and two groups of water channels are designed for each mold cavity. The front mold 1 and the rear mold 2 both have four inlets and four outlets. The mold cooling water channel design is consistent with the material flow direction, and adopts the design form of "straight-through water pipe + inclined water channel + water well". The inlet and outlet distances are equal, so that the plastic parts have a good cooling effect and appearance quality.

[0038] It is worth noting that since the tunnel slider 51 of this mold and the lateral core pulling projection area at the undercut of the workpiece are large and heat is concentrated, water cooling pipes 8 are designed on the dogleg sliding mechanism 5 and the inclined top inner core pulling mechanism to focus on cooling the glue position at the tunnel slider 51 and the straight push rod assembly 6.

[0039] Among them, the direction of cooling water must be consistent with the direction of material flow, so that the dissipated heat can be quickly absorbed during cooling; secondly, the water-cooling pipes 8 in the front mold 1 plate and the rear mold 2 plate are preferably designed in a cross grid form, and the cooling circuits form an interwoven water network that intersects each other to evenly cool the plastic parts; and when it is not possible to design a cross-type water channel, the water channels of the front mold 1 and the rear mold 2 are arranged alternately at gaps between each other; finally, the cooling water channel should be designed to be connected to another set of water channels for external water pipe connection, so as to facilitate the subsequent adjustment of plastic parts due to deformation, shrinkage, etc.

[0040] The working principle of this utility model:

[0041] The melt enters the molding cavity 3 of the mold through the nozzle of the injection molding machine. After the melt fills the molding cavity 3, it is pressurized, cooled and solidified to be sufficiently rigid. The bent pin 52 fixed on the front mold 1 acts on the tunnel slider 52, causing the bent pin 52 to push the tunnel slider 51 outward, and during the pushing process, the tunnel slider 51 is driven to move outward along the direction of the two-way slide rail 41, so that the tunnel slider 51 moves backward and is limited and fixed by the limit screw 42 at the maximum point, thereby preventing the tunnel slider 51 from falling. After completing the core pulling action, the injection molded product will be further ejected by the inclined ejector core pulling mechanism; then the injection molding machine pulls the front mold 1 plate of the mold, and the mold is opened from the joint of the front template 12 and the rear template 23. After the plastic part is taken out, the injection molding machine pushes the front mold to close the mold, and the mold starts the next injection molding.

[0042] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A mold for injection molding of a rearview mirror frame of an automobile, comprising a front mold and a rear mold, characterized in that: A molding cavity adapted to the outer frame of the automobile rearview mirror is formed between the front mold and the rear mold. The front mold is provided with a front mold tunnel on one side of the molding cavity. A two-way slide rail is provided on the inner side wall of the front mold tunnel, and the front mold tunnel is connected to a dogleg sliding mechanism in the direction of the two-way slide rail. The dogleg sliding mechanism includes a tunnel slider, a bent pin and a locking rod. Both sides of the tunnel slider are slidably connected to the two-way slide rail, and one side of the front mold tunnel slider is connected to the molding cavity. The bent pin is V-shaped, and one end of the bent pin is fixed to the front mold by the locking rod, and the other end passes through the tunnel slider and extends to the rear mold.

2. The mold for injection molding of the automobile rearview mirror frame according to claim 1, characterized in that: An inclined top inner core pulling mechanism is provided at the inner bottom end of the molding cavity, and the inclined top inner core pulling mechanism includes a straight push rod assembly and an inclined push rod assembly. The straight push rod assemblies are provided in multiple groups, and the multiple groups of straight push rod assemblies are evenly arranged between the molding cavity and the rear mold; the inclined push rod assemblies are symmetrically arranged in the middle position of the molding cavity, and the inclined push rod assemblies are inclined along the center direction of the molding cavity.

3. The mold for injection molding of the automobile rearview mirror frame according to claim 2, characterized in that: The straight push rod assembly includes a rear mold ejector plate, a rear mold ejector and a guide column. There are multiple rear mold ejector plates, and the multiple rear mold ejector plates are stacked and arranged in the rear mold. The rear mold ejectors are evenly arranged along the four sides of the molding cavity, and one end of the rear mold ejector is fixedly connected to the rear mold ejector plate, and the other end abuts against the bottom end of the molding cavity; a return spring is sleeved on the outer surface of the guide column.

4. The mold for injection molding of the automobile rearview mirror frame according to claim 3, characterized in that: The inclined push rod assembly includes an inclined push rod, an inclined pin slider and an inclined pin guide rail. The bottom end of the inclined push rod is slidably connected to the inclined pin slider by being set on a pulley, and the inclination angle of the inclined push rod is 5°-15°; the inclined pin slider is fixedly connected to the rear mold ejector plate by screws, and the inclined pin slider is provided with a positioning groove adapted to the sliding of the pulley; the inclined pin guide rail is connected to the top end of the inclined push rod, and a positioning protrusion protrudes outward on one side of the inclined pin guide rail, and the positioning protrusion abuts against the side wall of the molding cavity.

5. The mold for injection molding of the automobile rearview mirror frame according to claim 1, characterized in that: The front mold includes a front mold base and a front mold plate. A runner for pouring is provided at the top of the front mold base. A pouring flow channel connected to the molding cavity and the runner is provided in the front mold base and the front mold plate. A locking plate for locking the front mold and the rear mold is provided on one side of the front mold plate.

6. The mold for injection molding of the automobile rearview mirror frame according to claim 1, characterized in that: The rear mold includes a rear mold base, a mold foot gasket and a rear mold plate. The mold foot gasket is symmetrically arranged between the rear mold base and the rear mold plate, and the gap between the two mold foot gaskets forms an area for installing a straight push rod assembly.

7. The mold for injection molding of the automobile rearview mirror frame according to claim 6, characterized in that: A plurality of water cooling pipes are arranged in the front template and the rear template. The plurality of water cooling pipes are arranged in a crisscross pattern, and the flow direction of the water cooling pipes is the same as the material flow direction.

8. The mold for injection molding of the automobile rearview mirror frame according to claim 1, characterized in that: A limit screw for limiting the sliding distance of the tunnel slider is provided on the top of the front mold tunnel.

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