An injection mold and method for a leak-proof structure of a vehicle lamp light guide

Abstract

The present invention discloses an injection mold and method for a light guide anti-light leakage structure of a vehicle lamp, which relates to the technical field of injection molding, and includes: an upper mold and a lower mold. A cavity for injecting the anti-light leakage structure is provided between the upper mold and the lower mold. A gate is opened in the middle of the upper mold and extends into the cavity, and the molten injection material is injected into the cavity through the gate; a template is arranged on the upper part of the lower mold, and the bottom wall of the template is attached to the top wall of the lower mold. The top wall of the template and the upper mold form a complete inner wall of the cavity. The template includes a fitting part that forms the inner wall of the cavity, a twisting part located at the edge of the template, and a connecting part that connects the fitting part and the twisting part. A groove is opened in the twisting part; a traction piece is arranged at the bottom of the template and connected to the twisting part. The traction piece drives the twisting part to twist, and the traction piece pulls the template to cause deformation of the template. This application avoids the problems of surface defects and ejection marks generated by ejection after injection by adjusting the ejection method of the injection molded part, ensuring the integrity of the surface.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding, and particularly to an injection mold and method for a light guide leakage prevention structure of vehicle lights. Background Art

[0002] The vehicle light guide system can efficiently transmit light, improving the lighting effect and aesthetics of vehicle lights. Among them, the light guide leakage prevention structure plays the following roles:

[0003] Improve light efficiency: By preventing light leakage, ensuring that light is concentrated in the required area, improving the lighting effect and brightness of vehicle lights.

[0004] Reduce glare: Effectively control the propagation path of light, reduce glare interference for drivers and other road users, and improve driving safety.

[0005] Energy conservation and environmental protection: Reduce light waste, improve the utilization efficiency of light sources, thereby reducing energy consumption and extending the service life of light sources.

[0006] Improve aesthetics: By precisely controlling light, make the vehicle light more uniform and soft, improving the aesthetics and technological sense of vehicle lights.

[0007] Reduce internal loss: Through precise design and material selection, reduce the loss of light during the conduction process, ensuring the intensity and quality of light.

[0008] Publication No. CN110315711A discloses an injection mold for a light guide leakage prevention structure of vehicle lights, including an upper mold and a lower mold. A cavity is provided between the upper mold and the lower mold. The shape of the cavity is adapted to the light guide leakage prevention structure of vehicle lights. Multiple through holes are provided at the bottom of the cavity. An injection channel communicating with the cavity is provided on the upper mold. Multiple ejector pins are provided at the bottom of the lower mold. The top of the ejector pin is embedded in the through hole and corresponds to the through hole one by one. The bottom of the ejector pin is fixed to the bottom of the lower mold, and the ejector pin can move up and down. This injection mold solves the problem that the light guide leakage prevention structure of vehicle lights is not easy to demold through secondary ejection. Among them, the first ejection is to eject the light guide leakage prevention structure of vehicle lights as a whole through a top block, and the second ejection is to eject and peel the first light guide leakage prevention structure product and the second light guide leakage prevention structure product respectively through the second ejector pins located around.

[0009] When the existing injection mold with a light leakage prevention structure is demolded, most of them eject the mold through ejector pins. For example, in the above patent, however, when the light leakage prevention structure is ejected, the ejector pins will cause surface defects, ejector pin marks and deformation on the light leakage prevention structure. Therefore, in order to eliminate the surface problems of the injection molded parts caused by the ejector pins during the ejection process, it is necessary to strictly control the ejection speed and the matching accuracy between the ejector pins and the mold to reduce the influence caused by the ejection of the ejector pins. And ensuring the matching accuracy between the ejector pins and the mold requires more precise processing as well as frequent maintenance and upkeep, increasing the injection cost of the light leakage prevention structure. Summary of the Invention

[0010] One of the purposes of the present invention is to provide an injection mold and method for a vehicle lamp light guide light leakage prevention structure, which separates the injection molded part from the mold plate by twisting.

[0011] To achieve the above purposes, the present invention is realized through the following technical solutions: An injection mold for a vehicle lamp light guide light leakage prevention structure includes: an upper mold and a lower mold. Between the upper mold and the lower mold is a cavity for injecting the light leakage prevention structure. A gate is opened in the middle of the upper mold and extends into the cavity, and the melted injection material is injected into the cavity through the gate; The injection mold further includes:

[0012] A mold plate is arranged on the upper part of the lower mold. The bottom wall of the mold plate is attached to the top wall of the lower mold. The top wall of the mold plate and the upper mold form a complete inner wall of the cavity. The mold plate includes a fitting part that forms the inner wall of the cavity, a twisting part located at the edge of the mold plate, and a connecting part that connects the fitting part and the twisting part. A groove is opened in the twisting part;

[0013] A traction member is arranged at the bottom of the mold plate and connected to the twisting part. The traction member drives the twisting part to twist, and the traction member pulls the mold plate to cause deformation of the mold plate.

[0014] In one or more embodiments of the present invention, both the upper mold and the lower mold are composed of a fixing plate, a template, a mold core, and a positioning block. Among them, the fixing plate, the template, the mold core, and the positioning block are arranged up and down, respectively corresponding to form the upper mold and the lower mold. The template is located between the fixing plates, the mold core is located inside the template, and the cavity is opened inside the upper mold core. The lower mold core supports the mold plate;

[0015] The upper mold positioning block and the lower mold positioning block are engaged to position the connection between the upper mold and the lower mold.

[0016] In one or more embodiments of the present invention, a boss is arranged at the bottom of the twisting part, and a spherical groove is formed by the concave of the boss. The traction member extends into the spherical groove;

[0017] A jacking rod is arranged at the bottom of the traction member. The jacking rod pushes the traction member to move up and down to change the distance between the mold plate and the lower mold;

[0018] The bottom of the lifting rod is a pressure chamber, which is fixed inside the lower mold. The lifting rod extends into the pressure chamber. The pressure chamber is filled with a medium, and an elastic member is arranged on the inner bottom wall of the pressure chamber. The top of the elastic member is a push plate, and the elastic member supports the push plate.

[0019] In one or more embodiments of the present invention, the traction member includes:

[0020] A substrate, which is arranged inside the lower mold and connected to the lifting rod;

[0021] A torsion rod, one end close to the mold plate is spherical and extends into the spherical groove. The other end of the torsion rod extends into the lower mold. A telescopic member is arranged between the torsion rod and the substrate to change the telescopic length of the torsion rod;

[0022] The mold plate is provided with at least six bosses corresponding to the torsion rods. When the torsion part of the mold plate is a plane, the highest point of the torsion rod is in a plane parallel to the upper surface of the mold plate. The telescopic change of the torsion rod twists the mold plate by changing the highest point.

[0023] In one or more embodiments of the present invention, the telescopic member includes:

[0024] A rotating shaft, which penetrates the lower mold and can rotate relative to the lower mold. A driving member is arranged at one end of the rotating shaft to drive the rotating shaft to rotate;

[0025] A clamping plate, which is fixed on the outside of the torsion rod. A top block is arranged at the corresponding position of the rotating shaft to the clamping plate. The rotation of the rotating shaft pushes the top block to move upward;

[0026] A hydraulic chamber is arranged at the top of the substrate. The torsion rod extends into the hydraulic chamber. When the rotating shaft rotates to support the torsion rod to move upward, the pressure inside the hydraulic chamber increases;

[0027] The setting angle of the top block is based on the torsion state of the mold plate corresponding to the separation of the injection molded part from the mold plate.

[0028] In one or more embodiments of the present invention, the telescopic member includes:

[0029] A bracket, which is fixed on the upper part of the substrate. A hydraulic pipe is arranged inside the bracket. The torsion rod extends into the hydraulic pipe, and the hydraulic pipe extends to the outside of the lower mold;

[0030] A connecting pipe, which is installed on the outside of the hydraulic pipe. A sealing head is installed inside the connecting pipe to seal the hydraulic pipe. One end of the sealing head is provided with a magnetic plate. An electromagnet is arranged inside the connecting pipe. The electromagnet changes the sealing state of the sealing head to the hydraulic pipe by magnetic force cooperation with the magnetic plate. One end of the connecting pipe is set as a connecting head.

[0031] In one or more embodiments of the present invention, a cooling chamber is arranged inside the lower mold, and the cooling chamber is provided with at least two inlets and two outlets;

[0032] Both the two inlets and the outlets extend inside the lower mold;

[0033] The lower mold is provided with two mounting heads, and the mounting heads are mounted on the outer side of the lower mold.

[0034] In one or more embodiments of the present invention, both the two inlets and the outlet are arranged vertically. The lower inlet and the lower outlet both extend to the bottom wall of the cooling cavity. The upper inlet and the lower inlet are located on the side wall of the cooling cavity, and the bottom wall of the cooling cavity is arranged in a funnel-shaped inclination.

[0035] In one or more embodiments of the present invention, a positioning ring is configured at the bottom of the template, and a hopper groove is arranged at the position of the lower mold corresponding to the positioning ring. The hopper groove and the positioning ring cooperate to position the template.

[0036] The lower mold restricts the movement of the connection position of the torsion rod and the boss, and maintains the stability of the template and the torsion rod.

[0037] The present application also provides an injection molding method for a leak-proof light guide structure of a vehicle lamp, which is used for the above injection mold, and includes the following steps:

[0038] The upper mold and the lower mold are combined and fixed to the upper mold and the lower mold.

[0039] The raw material enters the cavity through the gate for injection molding.

[0040] The water cooling and air cooling of the cooling system are connected to the mounting head, so that the air cooling and water cooling perform a cooling cycle.

[0041] After cooling is completed, the upper mold is removed, the traction member pushes the template upward, and the height of the torsion portion is controlled.

[0042] The change in the height of the torsion portion controls the torsion of the template, and the injection molded part is separated from the template.

[0043] Through the above technical solutions, the present invention has the following beneficial effects:

[0044] 1. By adjusting the demolding method of the injection molded part, the present application avoids the surface defects and ejection marks generated by ejection after injection molding, ensures the integrity of the surface, further improves the surface quality of the injection molded part, and demolds the injection molded part by twisting, ensuring the quality of demolding of the injection molded part.

[0045] 2. The template is divided into a torsion portion, a fitting portion and a connecting portion. The arrangement of the torsion portion can facilitate the connection with the traction member to traction the torsion portion of the template, and realize the torsion of the template according to the height position of the template. After the template is twisted, a gap is generated between the injection molded part and the template, so that the injection molded part can be separated from the adhesion with the template.

[0046] 3. The telescopic member is used to control the height position of the template, so that the template can be in different degrees of torsion states. After the template is twisted, it is ensured that a gap will be generated between the injection molded part and the template, so that the injection molded part is separated from the template.

[0047] 4. When cooling the mold, the mold is cooled by air cooling and water cooling, and the temperature of the mold is reduced through double circulation. The water cooling and air cooling respectively enter the inside of the cooling cavity, mix inside the cooling cavity, and are recovered after separation by the cooling cavity.

[0048] Other features and advantages of the present invention will be described in the following specification, and some of them will become obvious from the specification or be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures specifically pointed out in the written specification and the accompanying drawings. Brief Description of the Drawings

[0049] Figure 1 is a perspective view of the present invention;

[0050] Figure 2 is an exploded view of the present invention;

[0051] Figure 3 is a partial schematic view of the present invention Figure 1 ;

[0052] Figure 4 is a partial schematic view of the present invention Figure 2 ;

[0053] Figure 5 is a schematic view of the template of the present invention;

[0054] Figure 6 is a schematic view of the template of the present invention;

[0055] Figure 7 is a schematic view of the structure of the template and the mold core of the present invention;

[0056] Figure 8 is a schematic view of the telescopic member of the present invention Figure 1 ;

[0057] Figure 9 is a schematic view of the connecting pipe of the present invention;

[0058] Figure 10 is a partial half-sectional plan view of the present invention;

[0059] Figure 11 is a bottom view of the present invention;

[0060] Figure 12 is a cross-sectional view of the pressure cavity of the present invention;

[0061] Figure 13 is a partial bottom view of the present invention Figure 1 ;

[0062] Figure 14 is a partial bottom view of the present invention Figure 2 .

[0063] In the figure: 100 upper die, 200 lower die, 300 gate, 400 mold plate, 500 cavity, 600 traction part;

[0064] 11 fixing plate, 12 template, 13 mold core, 14 positioning block;

[0065] 401 fitting part, 402 torsion part, 403 connecting part, 404 boss, 405 spherical groove, 406 positioning ring, 407 bucket groove;

[0066] 21 lifting rod, 22 pressure chamber, 23 elastic part, 24 push plate;

[0067] 601 base plate, 602 torsion rod, 603 telescopic part;

[0068] a31 rotating shaft, a32 driving part, a33 clamping plate, a34 ejector block, a35 hydraulic chamber;

[0069] b31 bracket, b32 hydraulic pipe, b33 connecting pipe, b34 sealing head, b35 magnetic plate, b36 electromagnet, b37 connecting head;

[0070] 31 cooling chamber, 32 inlet, 33 outlet. Detailed implementation manners

[0071] The following will disclose multiple embodiments of the present invention with the accompanying drawings. For the sake of clear illustration, many practical details will be described together in the following narrative. However, it should be understood that these practical details are not used to limit the present invention. That is to say, in some embodiments of the present invention, these practical details are not necessary. And if possible in implementation, the features of different embodiments can be applied interactively.

[0072] Unless otherwise defined, all the terms (including technical and scientific terms) used herein have their ordinary meanings, and their meanings can be understood by those skilled in this field. Further, the definitions of the above terms in commonly used dictionaries should be interpreted as having the same meaning as that in the relevant field of the present invention. Unless specifically defined, these terms will not be interpreted as idealized or overly formal meanings.

[0073] The following explains the relationships and terms used in this application:

[0074] Parallel: The parallel defined in this application is not limited to absolute parallel. This definition of parallel can be understood as substantially parallel, allowing for situations where it is not absolutely parallel due to factors such as assembly tolerances, design tolerances, and the influence of structural flatness. Small-angle range errors are allowed, for example, within an assembly error range of 10 degrees, and it can be understood as a parallel relationship.

[0075] Vertical: The vertical as defined in this application is not limited to an absolutely vertically intersecting (with an included angle of 90 degrees) relationship. A relationship that is not an absolutely vertically intersecting one due to factors such as assembly tolerances, design tolerances, and the influence of structural flatness is allowed, and a small-angle range of errors is permitted. For example, within the assembly error range of 80 degrees to 100 degrees, it can all be understood as a vertical relationship.

[0076] The above explanation does not fully cover the relationship definition given in this application and only represents a part of this application.

[0077] The present invention provides an injection mold for a leak-proof structure of a vehicle lamp light guide, which is used for injecting the leak-proof structure of the light guide, changes the ejection demolding method, and controls the separation of the leak-proof structure from the mold by twisting to change the mold state, avoiding surface problems caused by ejector pins during ejection.

[0078] As Figures 1 - 4 shown, in one embodiment, the injection mold includes: an upper mold 100 and a lower mold 200. Between the upper mold 100 and the lower mold 200 is a cavity 500 for injecting the leak-proof structure. A gate 300 is opened in the middle of the upper mold 100 and extends into the cavity 500, and the molten injection material is injected into the interior of the cavity 500 through the gate 300;

[0079] The injection mold further includes:

[0080] A template 400 is arranged on the upper part of the lower mold 200. The bottom wall of the template 400 is attached to the top wall of the lower mold 200. The top wall of the template 400 and the upper mold 100 form a complete inner wall of the cavity 500. The template 400 includes a fitting part 401 that forms the inner wall of the cavity 500, a twisting part 402 located at the edge of the template 400, and a connecting part 403 that connects the fitting part 401 and the twisting part 402. A groove is opened in the twisting part 402;

[0081] A traction member 600 is arranged at the bottom of the template 400 and is connected to the twisting part 402. The traction member 600 drives the twisting part 402 to twist, and the traction member 600 pulls the template 400 to cause deformation of the template 400.

[0082] In an implementable manner, the template 400 is used to form the bottom wall of the cavity 500. When demolding the injection molded part, the template 400 is lifted, and the traction member 600 is used to drive the template 400 to twist, causing deformation of the cavity 500 formed by the template 400, so that the injection molded part can be separated from the template 400. The thickness of the template 400 is small and it is a rigid structure. After the template 400 is bent, a gap is generated in the connection between the injection molded part and the template 400, enabling the injection molded part to be separated from the cavity 500.

[0083] Among them, the torsion part 402 determines the torsion states at multiple different positions by opening slots, and the height of the traction member 600 changes, so that the template 400 is twisted to different states, thereby realizing the judgment of the bending state of the template 400.

[0084] When the template 400 fits the lower mold 200, the template 400 is restricted by the lower mold 200 and will not bend, ensuring the stability of the injection molded part during the injection molding and cooling processes. In order to ensure that the injection molded part adheres to the template 400 during demolding, the surface of the template 400 is specially treated, such as polishing or plating, to increase the adhesion of the injection molded part, and the surface of the upper mold 100 is treated to reduce adhesion. The present application does not limit the treatment method of the template 400, and the injection molded part can be located inside the lower mold 200 after demolding.

[0085] It should be noted that ensuring the adhesion of the injection molded part to the template 400 is for the convenience of subsequent part-taking operations. Compared with the injection molded part adhering to the upper mold 100 plate or not adhering, the adhesion of the injection molded part to the template 400 can prevent the injection molded part from falling or deviating in position, which is more conducive to grasping the injection molded part.

[0086] As Figures 2 - 5 shown, in one embodiment, both the upper mold 100 and the lower mold 200 are composed of a fixing plate 11, a template 12, a mold core 13, and a positioning block 14. Among them, the fixing plate 11, the template 12, the mold core 13, and the positioning block 14 are all arranged vertically, respectively corresponding to form the upper mold 100 and the lower mold 200. The template 12 is located between the fixing plates 11, the mold core 13 is located inside the template 12, and the cavity 500 is opened inside the upper mold 100 core, and the lower mold 200 core supports the template 400;

[0087] The positioning block 14 of the upper mold 100 meshes with the positioning block 14 of the lower mold 200 to position the connection between the upper mold 100 and the lower mold 200.

[0088] In an implementable manner, optionally, the upper mold 100 and the lower mold 200 are connected by guide posts. The guide posts are installed in the lower mold 200 and extend upward to the upper mold 100. Bolts are configured inside the upper mold 100 and are screwed into the guide posts to fix the upper mold 100 and the lower mold 200.

[0089] As Figures 10 - 12 shown, in one embodiment, a boss 404 is provided at the bottom of the torsion part 402, and a spherical groove 405 is formed by concave in the boss 404, and the traction member 600 extends into the spherical groove 405;

[0090] A jacking rod 21 is configured at the bottom of the traction member 600, and the jacking rod 21 pushes the traction member 600 to move up and down to change the distance between the template 400 and the lower mold 200;

[0091] The bottom of the lifting rod 21 is a pressure chamber 22. The pressure chamber 22 is fixed inside the lower mold 200. The lifting rod 21 extends into the pressure chamber 22. The pressure chamber 22 is filled with a medium, and an elastic member 23 is disposed on the inner bottom wall of the pressure chamber 22. The top of the elastic member 23 is a push plate 24, and the elastic member 23 supports the push plate 24.

[0092] In an implementable manner, the setting of the pressure chamber 22 can change following the position of the lifting rod 21. When the lifting rod 21 is squeezed, that is, during the process of injection molding when the upper mold 100 and the lower mold 200 are connected and fixed, the lifting rod 21 retracts, increasing the pressure of the medium inside the pressure chamber 22, thereby squeezing the push plate 24. The push plate 24 moves downward, and the elastic member 23 is stressed. After the upper mold 100 and the lower mold 200 are removed, the elastic member 23 rebounds against the push plate 24, pushing the lifting rod 21 outwards, thereby pushing out the traction member 600.

[0093] Optionally, the elastic member 23 is a compression spring, and the resilience of the spring is used to support the push plate 24 so that the push plate 24 can be reset.

[0094] Another option is that the elastic member 23 is two mutually repulsive magnets, and the repulsive force of the magnets is used to reset the push plate 24.

[0095] The height position of the push plate 24 is changed by the elastic member 23, and the height of the traction member 600 is controlled by the lifting rod 21 synchronously, so that after the upper mold 100 is separated from the lower mold 200, the template 400 can be lifted immediately.

[0096] As Figures 5 - 6 and Figure 13 shown, in an embodiment, the traction member 600 includes:

[0097] A substrate 601, disposed inside the lower mold 200 and connected to the lifting rod 21;

[0098] A torsion rod 602, one end close to the template 400 is spherical and extends into the spherical groove 405. The other end of the torsion rod 602 extends into the lower mold 200. A telescopic member 603 is disposed between the torsion rod 602 and the substrate 601 to change the telescopic length of the torsion rod 602;

[0099] The template 400 is provided with at least six bosses 404 corresponding to the torsion rods 602. When the torsion part 402 of the template 400 is a plane, the highest point of the torsion rod 602 is in a plane parallel to the upper surface of the template 400. The telescopic change of the torsion rod 602 twists the template 400 by changing the highest point.

[0100] In an implementable manner, the height change of the torsion bar 602 is utilized to twist the template 400, thereby changing the height states of the template 400 at different positions and achieving the corresponding twisting effect. The groove formed in the twisting portion 402 can reduce the force required to twist the template 400. When twisting, it is not necessary to apply an excessive twisting force to the template 400. It is sufficient that the injection molded part can be separated from the template 400. Therefore, the groove is formed to determine the twisting range.

[0101] The present application does not limit the specific number and position of the torsion bars 602. The number and position of the torsion bars 602 can be determined according to the leakage prevention structure with different structures and the shape of the template 400. Exemplarily, in the present application, the number of the torsion bars 602 is six, and the positions of the torsion bars 602 are symmetrically arranged in the front, back, left, and right directions.

[0102] As Figure 10 shown, in an embodiment, the telescopic member 603 includes:

[0103] A rotating shaft that penetrates the lower mold 200 and can rotate relative to the lower mold 200. One end of the rotating shaft is provided with a driving member a32 for driving the rotation of the rotating shaft;

[0104] A clamping plate a33 is fixed to the outside of the torsion bar 602. A top block a34 is provided at the corresponding position of the rotating shaft with respect to the clamping plate a33. The rotation of the rotating shaft pushes the top block a34 to move upward;

[0105] A hydraulic cavity a35 is provided at the top of the substrate 601. The torsion bar 602 extends into the hydraulic cavity a35. When the rotating shaft rotates to support the upward movement of the torsion bar 602, the pressure inside the hydraulic cavity a35 increases;

[0106] The setting angle of the top block a34 is based on the twisting state of the template 400 corresponding to the separation of the injection molded part from the template 400.

[0107] In an implementable manner, the rotating shaft is driven to rotate by the driving member a32. By using the top blocks a34 set at different angles, the template 400 can be twisted and changed by the torsion bar 602, so that the injection molded part can be separated from the adhesion with the template 400. The setting angle of the top block a34 is determined according to the twisting change of the template 400 required for the separation of the injection molded part from the template 400.

[0108] Since the rotating shaft and the top block a34 are fixedly connected, the height of the torsion bar 602 is changed by the top block a34 during the rotation of the rotating shaft. Therefore, correspondingly, the twisting angle of the template 400 that each rotating shaft can achieve is a fixed angle. In order to adjust the twisting angle, the rotating shaft is detachably installed.

[0109] A fastening member is arranged on the outside of the rotating shaft. The fastening member is installed on the inner side of the lower mold 200 through screws. The fastening member and the lower mold 200 cooperate to form the positioning of the rotating shaft.

[0110] In another embodiment, the driving member a32 is a servo motor, which is installed at the lower mold 200, and the output end is connected to the rotating shaft, and the servo motor drives the rotating shaft to rotate.

[0111] In another alternative embodiment, a meshing gear is installed on the rotating shaft, and the servo motor is installed inside the lower mold 200, and the two rotating shafts are driven to rotate through the transmission of the meshing gear.

[0112] As Figures 7 - 9 shown, in one embodiment, the telescopic member 603 includes:

[0113] A bracket b31, fixed to the upper part of the substrate 601, a hydraulic pipe b32 is arranged inside the bracket b31, the torsion bar 602 extends into the hydraulic pipe b32, and the hydraulic pipe b32 extends to the outside of the lower mold 200;

[0114] A connecting pipe b33, installed on the outside of the hydraulic pipe b32, a sealing head b34 is installed inside the connecting pipe b33 to seal the hydraulic pipe b32, one end of the sealing head b34 is configured with a magnetic plate b35, an electromagnet b36 is configured inside the connecting pipe b33, and the electromagnet b36 changes the sealing state of the sealing head b34 for the hydraulic pipe b32 by magnetic force cooperation with the magnetic plate b35, and one end of the connecting pipe b33 is set as a connecting head b37.

[0115] In an implementable manner, one end of the connecting head b37 is connected to the hydraulic component, and the connecting head b37 is connected through the hydraulic component to increase the amount of medium inside the hydraulic pipe b32, so as to control the torsional state of the template 400. The electromagnet b36 repels or attracts the magnetic plate b35 to change the position of the sealing head b34 and control the communication state between the connecting pipe b33 and the hydraulic pipe b32.

[0116] In another embodiment, the hydraulic pipe b32 corresponding to each torsion bar 602 is separately connected to the hydraulic component, and the hydraulic component controls the amount of medium inside each hydraulic pipe b32 respectively.

[0117] In another alternative embodiment, the telescopic member 603 is an electric telescopic rod, and the extension length of the torsion bar 602 is controlled by the electric telescopic rod. However, the structure of the electric telescopic rod is relatively complex and needs to be installed inside the mold. Therefore, compared with the above two embodiments of the telescopic member 603, the installation of the electric telescopic rod will increase the volume of the mold.

[0118] As Figures 10 - 11 shown, in one embodiment, a cooling cavity 31 is arranged inside the lower mold 200, and the cooling cavity 31 is configured with at least two inlets 32 and two outlets 33;

[0119] Both the two inlets 32 and the outlets 33 extend inside the lower mold 200;

[0120] The lower mold 200 is provided with two mounting heads, and the mounting heads are mounted on the outer side of the lower mold 200.

[0121] In an implementable manner, the mounting head is used to connect the cooling pipe of the cooling system. The two inlets 32 and the outlet 33 are respectively used for air cooling and water cooling, that is, the inlet 32 and the outlet 33 form a separate cooling circulation path, and air cooling and water cooling are mixed and cooled at the cooling cavity 31. At the position of the cooling cavity 31, due to the influence of its own mass, the water cooling is at the bottom of the cooling cavity 31, and the air cooling is at the top of the cooling cavity.

[0122] Such as Figure 4 、 Figure 10 And Figure 14 As shown in

[0123] In an implementable manner, at the bottom wall of the cooling cavity 31 where the lower inlet 32 and the lower outlet 33 are located, the lower inlet 32 and the lower outlet 33 are both used for water cooling. The funnel-shaped setting of the bottom wall of the cooling cavity 31 can facilitate the guiding of the coolant, so as to ensure the stable recovery of the coolant.

[0124] Such as Figure 4 And Figures 13 - 14 As shown in

[0125] The lower mold 200 restricts the movement of the connection position between the torsion bar 602 and the boss 404, and maintains the stability of the template 400 and the torsion bar 602.

[0126] In an implementable manner, positioning the template 400 can ensure the stability of the template 400. After the template 400 is matched with the lower mold 200, the movement of the template 400 is avoided. And the hopper groove 407 is set larger than the positioning ring 406. During installation, when the template 400 is matched with the lower mold 200, the cooperation between the hopper groove 407 and the positioning ring 406 can quickly adjust the position of the template 400 and ensure the matching accuracy between the template 400 and the lower mold 200.

[0127] This application also provides an injection molding method for a leak-proof light guide structure of a vehicle lamp, which is used for the above injection molding mold, and includes the following steps:

[0128] The upper mold 100 and the lower mold 200 are combined and the upper mold 100 and the lower mold 200 are fixed;

[0129] The raw material enters the interior of the cavity 500 through the gate 300 for injection molding;

[0130] The water-cooling and air-cooling of the cooling system are connected to the mounting head, enabling the air-cooling and water-cooling to carry out a cooling cycle;

[0131] After cooling is completed, the upper mold is removed, the traction member 600 pushes the mold plate 400 upward, and controls the height of the torsion part 402;

[0132] The change in the height of the torsion part 402 controls the torsion of the mold plate 400, and the injection molded part is separated from the mold plate 400.

[0133] In summary, the technical solutions disclosed in the above embodiments of the present invention have at least the following advantages:

[0134] 1. By adjusting the demolding method of the injection molded part, the present application avoids the surface defects and ejection marks generated after ejection, ensures the integrity of the surface, further improves the surface quality of the injection molded part, and uses the torsion method to separate the injection molded part from the mold plate, completing the demolding of the injection molded part and ensuring the demolding quality of the injection molded part.

[0135] 2. The mold plate is divided into a torsion part, a fitting part, and a connecting part. The setting of the torsion part facilitates the connection with the traction member to traction the torsion part of the mold plate, and realizes the torsion of the mold plate according to the height position of the mold plate. After the mold plate is twisted, a gap is generated between the injection molded part and the mold plate, enabling the injection molded part to be separated from the adhesion of the mold plate.

[0136] 3. The telescopic member is used to control the height position of the mold plate, enabling the mold plate to be in different degrees of torsion states. After the mold plate is twisted, it is ensured that a gap will be generated between the injection molded part and the mold plate, enabling the injection molded part to be separated from the mold plate.

[0137] 4. When cooling the mold, the mold is cooled by air-cooling and water-cooling, and the temperature of the mold is reduced through double circulation. The water-cooling and air-cooling respectively enter the interior of the cooling cavity, mix inside the cooling cavity, and are recovered after separation in the cooling cavity.

[0138] Although the present invention is disclosed in combination with the above embodiments, it is not intended to limit the present invention. Any person familiar with this art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims

1. An injection mold for a light guide leak-proof structure of a vehicle lamp, comprising: The upper mold (100) and the lower mold (200), there is a cavity (500) for injection molding of a light leakage prevention structure between the upper mold (100) and the lower mold (200), and a gate (300) is opened in the middle of the upper mold (100) and extends into the cavity (500); It is characterized in that the injection mold further includes: A mold plate (400), arranged on the upper part of the lower mold (200), the bottom wall of the mold plate (400) is attached to the top wall of the lower mold (200), and the top wall of the mold plate (400) and the upper mold (100) form a complete inner wall of the cavity (500). The mold plate (400) includes a fitting part (401) that forms the inner wall of the cavity (500), a twisting part (402) located at the edge of the mold plate (400), and a connecting part (403) that connects the fitting part (401) and the twisting part (402), and a groove is opened in the twisting part (402); A traction member (600) is arranged at the bottom of the mold plate (400) and is connected to the twisting part (402). The traction member (600) drives the twisting part (402) to twist, and the traction member (600) pulls the mold plate (400) to cause deformation of the mold plate (400); A boss (404) is arranged at the bottom of the twisting part (402), and a spherical groove (405) is formed by concave in the boss (404), and the traction member (600) extends into the spherical groove (405); A jacking rod (21) is arranged at the bottom of the traction member (600), and the jacking rod (21) pushes the traction member (600) to move up and down to change the distance between the mold plate (400) and the lower mold (200); The traction member (600) includes: A base plate (601), arranged inside the lower mold (200) and connected to the jacking rod (21); A twisting rod (602), one end close to the mold plate (400) is spherical and extends into the spherical groove (405), the other end of the twisting rod (602) extends into the lower mold (200), and a telescopic member (603) is arranged between the twisting rod (602) and the base plate (601) to change the telescopic length of the twisting rod (602).

2. The injection mold for a vehicle lamp light guide anti-light leakage structure according to claim 1, characterized in that, Both the upper mold (100) and the lower mold (200) are composed of a fixing plate (11), a template (12), a mold core (13), and a positioning block (14). Among them, the fixing plate (11), the template (12), the mold core (13), and the positioning block (14) are all arranged up and down, respectively corresponding to form the upper mold (100) and the lower mold (200). The template (12) is located between the fixing plates (11), the mold core (13) is located inside the template (12), and the cavity (500) is opened inside the upper mold core (100), and the lower mold core supports the mold plate (400); The positioning blocks (14) of the upper mold (100) and the lower mold (200) are engaged to position the connection between the upper mold (100) and the lower mold (200).

3. The injection mold for a vehicle lamp light guide anti-light leakage structure according to claim 2, characterized in that, The bottom of the jacking rod (21) is a pressure chamber (22), the pressure chamber (22) is fixed inside the lower mold (200), the jacking rod (21) extends into the pressure chamber (22), the pressure chamber (22) is filled with a medium, and an elastic member (23) is arranged on the inner bottom wall of the pressure chamber (22), and the top of the elastic member (23) is a push plate (24), and the elastic member (23) supports the push plate (24).

4. The injection mold for a vehicle lamp light guide anti-light leakage structure according to claim 3, characterized in that, The template (400) is provided with at least six bosses (404) corresponding to the torsion rods (602). When the torsion part (402) of the template (400) is a plane, the highest point of the torsion rod (602) is in a plane parallel to the upper surface of the template (400). The telescopic change of the torsion rod (602) twists the template (400) by changing the highest point.

5. The injection mold for a vehicle lamp light guide anti-light leakage structure according to claim 4, characterized in that, The telescopic member (603) includes: A rotating shaft that penetrates the lower mold (200) and can rotate relative to the lower mold (200). One end of the rotating shaft is provided with a driving member (a32) for driving the rotating shaft to rotate; A clamping plate (a33) is fixed to the outside of the torsion rod (602). A top block (a34) is provided at the corresponding position of the rotating shaft with respect to the clamping plate (a33). The rotation of the rotating shaft pushes the top block (a34) to move upward; A hydraulic cavity (a35) is provided at the top of the base plate (601). The torsion rod (602) extends into the hydraulic cavity (a35). When the rotating shaft rotates to support the upward movement of the torsion rod (602), the pressure inside the hydraulic cavity (a35) increases; The setting angle of the top block (a34) is based on the torsion state of the template (400) corresponding to the injection molded part detaching from the template (400).

6. The injection mold for a vehicle lamp light guide anti-light leakage structure according to claim 4, characterized in that, The telescopic member (603) includes: A bracket (b31) is fixed to the upper part of the base plate (601). A hydraulic pipe (b32) is provided inside the bracket (b31). The torsion rod (602) extends into the hydraulic pipe (b32), and the hydraulic pipe (b32) extends to the outside of the lower mold (200); A connecting pipe (b33) is installed outside the hydraulic pipe (b32). A sealing head (b34) is installed inside the connecting pipe (b33) to seal the hydraulic pipe (b32). One end of the sealing head (b34) is configured with a magnetic plate (b35). An electromagnet (b36) is configured inside the connecting pipe (b33). The electromagnet (b36) changes the sealing state of the sealing head (b34) for the hydraulic pipe (b32) through magnetic cooperation with the magnetic plate (b35). One end of the connecting pipe (b33) is set as a connecting head (b37).

7. An injection mold for a light guide anti-light leakage structure of a vehicle lamp according to claim 5 or 6, characterized in that, A cooling cavity (31) is provided inside the lower mold (200). The cooling cavity (31) is configured with at least two inlets (32) and two outlets (33); Both of the two inlets (32) and the outlets (33) extend inside the lower mold (200); Two mounting heads are provided on the lower mold (200), and the mounting heads are installed outside the lower mold (200).

8. An injection mold for a light guide anti-light leakage structure of a vehicle lamp, characterized in that, Both of the two inlets (32) and the outlets (33) are arranged vertically. The lower inlet (32) and the lower outlet (33) both extend to the bottom wall of the cooling cavity (31). The upper inlet (32) and the lower inlet (32) are located on the side wall of the cooling cavity (31). The bottom wall of the cooling cavity (31) is inclined in a funnel shape.

9. An injection mold for a light guide anti-light leakage structure of a vehicle lamp, characterized in that, A positioning ring (406) is configured at the bottom of the template (400). A bucket-shaped groove (407) is provided at the corresponding position of the lower mold (200) with respect to the positioning ring (406). The bucket-shaped groove (407) cooperates with the positioning ring (406) to position the template (400); The lower mold (200) restricts the movement of the connection position between the torsion rod (602) and the boss (404) to maintain the stability of the template (400) and the torsion rod (602).

10. Injection molding method for the light guide leak-proof structure of vehicle lights, which is used for the injection mold according to any one of claims 1-9, characterized in that, Including the following steps: The upper mold (100) is combined with the lower mold (200) and the upper mold (100) and the lower mold (200) are fixed; The raw material enters the cavity (500) through the gate (300) for injection molding; The water cooling and air cooling of the cooling system are connected to the mounting head to enable the air cooling and water cooling to carry out a cooling cycle; After cooling is completed, the upper mold is removed, the traction part (600) pushes the mold plate (400) upward, and controls the height of the torsion part (402); The change in the height of the torsion part (402) controls the torsion of the mold plate (400), and the injection molded part is separated from the mold plate (400).

Images