Injection mold and method for vehicle lamp light guide light leakage prevention structure

Abstract

The invention discloses an injection mold and method for a vehicle lamp light guide light leakage prevention structure, and relates to the technical field of injection molding, the injection mold comprises an upper mold and a lower mold, a cavity for injection molding of the light leakage prevention structure is formed between the upper mold and the lower mold, a pouring gate is formed in the middle of the upper mold and extends into the cavity, and a molten injection molding material is injected into the cavity through the pouring gate; the template is arranged on the upper portion of the lower die, the bottom wall of the template is attached to the top wall of the lower die, the top wall of the template and the upper die form a complete cavity inner wall, the template comprises an attaching part forming the cavity inner wall, a twisting part located at the edge of the template and a connecting part connecting the attaching part and the twisting part, and a groove is formed in the twisting part; a traction piece is arranged at the bottom of the template and connected with the twisting part, drives the twisting part to twist, and pulls the template to cause deformation of the template. By adjusting the demolding mode of the injection molded part, the problems of surface defects and ejection traces generated by ejection after injection molding are avoided, and the surface integrity is guaranteed.

Description

Technical Field

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

[0002] The headlight guide system can efficiently transmit light and improve the lighting effect and aesthetics of the headlights. Among them, the light guide light leakage structure plays the following roles: Improve light efficiency: By preventing light leakage, ensure that the light is focused on the required area, and improve the lighting effect and brightness of the headlights.

[0003] Reduce glare: effectively control the propagation path of light, reduce glare interference to drivers and other road users, and improve driving safety.

[0004] Energy saving and environmental protection: reduce light waste and improve the utilization efficiency of light sources, thereby reducing energy consumption and extending the life of light sources.

[0005] Improved aesthetics: By precisely controlling the light, the light of the car lights is made more uniform and softer, which improves the aesthetics and technological sense of the car lights.

[0006] Reduce internal loss: Through precise design and material selection, reduce the loss of light during transmission and ensure the intensity and quality of light.

[0007] Announcement No. CN110315711A discloses an injection mold for a light-leakage prevention structure for a headlight, comprising 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-leakage prevention structure for a headlight, a plurality of through holes are provided at the bottom of the cavity, an injection channel connected to the cavity is provided on the upper mold, a plurality of ejector pins are provided at the bottom of the lower mold, the tops of the ejector pins are embedded in the through holes and correspond to the through holes one by one, the bottoms of the ejector pins are fixed to the bottom of the lower mold, and the ejector pins can move up and down. The injection mold solves the problem that the light-leakage prevention structure for a headlight is not easy to demold by secondary ejection; wherein, the first ejection ejects the headlight leakage prevention structure as a whole through the ejection block, and the second ejection ejects and peels off the first headlight leakage prevention structure product and the second headlight leakage prevention structure product respectively through the second ejector pins located on the four sides.

[0008] When demolding, the existing injection molds of the anti-light leakage structure mostly use ejectors to eject the mold, such as the above-mentioned patent. However, when the anti-light leakage structure is ejected, the ejector will cause surface defects, ejector marks and deformation of the anti-light leakage structure. Therefore, in order to eliminate the surface problems of the injection molded parts caused by the ejector during the ejection process, it is necessary to strictly control the ejection speed and the matching accuracy between the ejector and the mold to reduce the impact caused by the ejection of the ejector. Ensuring the matching accuracy between the ejector and the mold requires more sophisticated processing and frequent care and maintenance, which increases the injection molding cost of the anti-light leakage structure. Summary of the invention

[0009] One of the purposes of the present invention is to provide an injection mold and method for a light leakage prevention structure of a vehicle lamp, which can separate the injection molded part from the mold plate by twisting.

[0010] To achieve the above objectives, the present invention is implemented through the following technical solutions: an injection mold for a light guide anti-light leakage structure of a car lamp, comprising: an upper mold and a lower mold, a cavity for injection molding the anti-light leakage structure is provided between the upper mold and the lower mold, a gate is provided in the middle of the upper mold and extends into the cavity, and the melted injection molding material is injected into the cavity through the gate; the injection mold also comprises: The mold plate is arranged on the upper part of the lower mold, the bottom wall of the mold plate is fitted with 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 mold cavity, the mold plate includes a fitting part forming the inner wall of the mold cavity, a twisting part located at the edge of the mold plate, and a connecting part connecting the fitting part and the twisting part, and the twisting part is provided with a groove body; A traction piece is arranged at the bottom of the template and is connected with the torsion part. The traction piece drives the torsion part to torsion, and the traction piece pulls the template to cause the template to deform.

[0011] In one or more embodiments of the present invention, the upper mold and the lower mold are both composed of a fixed plate, a template, a mold core and a positioning block, wherein the fixed plate, the template, the mold core and the positioning block are all arranged up and down, respectively corresponding to the upper mold and the lower mold, the template is located between the fixed plates, the mold core is located inside the template, and the mold cavity is opened on the inner side of the upper mold core, and the lower mold core supports the mold plate; The upper die positioning block is engaged with the lower die positioning block to position the connection between the upper die and the lower die.

[0012] In one or more embodiments of the present invention, a boss is provided at the bottom of the torsion portion, the boss is concave to form a spherical groove, and the traction member extends into the spherical groove; A lifting rod is arranged at the bottom of the traction member, and the lifting rod pushes the traction member to move up and down to change the distance between the template and the lower mold; The bottom of the lifting rod is a pressure chamber, the pressure chamber 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 bottom wall of the pressure chamber, and a push plate is provided on the top of the elastic member to support the push plate.

[0013] In one or more embodiments of the present invention, the traction member includes: A base plate is disposed inside the lower mold and connected to the lifting rod; The torsion rod has one end close to the mold plate and is spherical and extends into the spherical groove, and the other end of the torsion rod extends into the lower mold. A telescopic member is arranged between the torsion rod and the base plate to change the telescopic length of the torsion rod. The template is provided with at least six bosses corresponding to the torsion rods. When the torsion portion of the template is a plane, the highest point of the torsion rod is in a plane parallel to the upper surface of the template. The torsion rod is telescopic to change the highest point to torsion the template.

[0014] In one or more embodiments of the present invention, the telescopic member comprises: A rotating shaft passes through the lower die and can rotate relative to the lower die, and a driving member is provided at one end of the rotating shaft for driving the rotating shaft to rotate; The clamping plate is fixed on the outside of the torsion rod, and a top block is arranged at the position of the rotating shaft corresponding to the clamping plate, and the rotating shaft rotates to push the top block to move upward; A hydraulic chamber is arranged on the top of the base plate, and 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. The setting angle of the top block is based on the twisted state of the mold plate corresponding to the injection molded part being separated from the mold plate.

[0015] In one or more embodiments of the present invention, the telescopic member comprises: The bracket is fixed on the upper part of the base plate, a hydraulic pipe is arranged inside the bracket, the torsion rod extends to the inside of the hydraulic pipe, and the hydraulic pipe extends to the outside of the lower mold; The connecting pipe is installed on the outside of the hydraulic pipe, and a sealing head is installed on the inside of the connecting pipe to seal the hydraulic pipe. A magnetic plate is arranged at one end of the sealing head, and an electromagnet is arranged inside the connecting pipe. The electromagnet changes the sealing state of the sealing head for the hydraulic pipe by cooperating with the magnetic force of the magnetic plate. One end of the connecting pipe is set as a connecting head.

[0016] In one or more embodiments of the present invention, a cooling cavity is provided inside the lower mold, and the cooling cavity is provided with at least two inlets and two outlets; Both inlet and outlet ports extend inside the lower die; The lower die is provided with two mounting heads, and the mounting heads are mounted on the outer side of the lower die.

[0017] In one or more embodiments of the present invention, the two inlets and outlets are arranged up and down, the lower inlet and the lower outlet both extend to the bottom wall of the cooling chamber, the upper inlet and the lower inlet are located on the side wall of the cooling chamber, and the bottom wall of the cooling chamber is arranged in a bucket shape and inclined.

[0018] In one or more embodiments of the present invention, a positioning ring is arranged at the bottom of the template, and a bucket groove is arranged at the position of the lower mold corresponding to the positioning ring, and the bucket groove cooperates with the positioning ring to position the template; The lower die limits the movement of the connection position between the torsion bar and the boss, and maintains the stability of the mold plate and the torsion bar.

[0019] The present application also provides an injection molding method for a vehicle lamp light guide anti-light leakage structure, which is used for the above-mentioned injection molding mold, comprising the following steps: The upper die is combined with the lower die and the upper die and the lower die are fixed; The raw material enters the cavity through the gate for injection molding; The water cooling and air cooling of the cooling system are connected to the mounting head to enable air cooling and water cooling to perform cooling circulation; After cooling is completed, the upper mold is removed, and the traction piece pushes the template upwards to control the height of the torsion part; The height change of the torsion portion controls the torsion of the mold plate, and the injection molded part is separated from the mold plate.

[0020] Through the above technical solution, the present invention has the following beneficial effects: 1. The present application avoids the surface defects and ejection marks caused by ejection after injection molding by adjusting the demoulding method of the injection molded parts, thereby ensuring the integrity of the surface and further improving the surface quality of the injection molded parts. The injection molded parts are separated from the mold plate by twisting, and the injection molded parts are completely demoulded to ensure the demoulding quality of the injection molded parts.

[0021] 2. The template is divided into a torsion portion, a fitting portion and a connection portion. The torsion portion can be easily connected to a traction member to pull the torsion portion of the template. The template is twisted 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 to the template.

[0022] 3. Use telescopic parts to control the height position of the template so that the template can be in a torsion state of different degrees. After the template is twisted, ensure that a gap will be created between the injection molded part and the template so that the injection molded part can be separated from the template.

[0023] 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 enter the cooling chamber respectively, mix inside the cooling chamber, and are recovered after separation in the cooling chamber.

[0024] Other features and advantages of the present invention will be described in the following description, and part of them will become obvious from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A perspective view of the present invention; Figure 2 An exploded view of the present invention; Figure 3 This is a partial schematic diagram of the present invention. Figure 1 ; Figure 4 This is a partial schematic diagram of the present invention. Figure 2 ; Figure 5 It is a schematic diagram of the template of the present invention; Figure 6 It is a schematic diagram of a template of the present invention; Figure 7 It is a schematic diagram of the template and mold core structure of the present invention; Figure 8 The telescopic member of the present invention is shown in FIG. Figure 1 ; Fig. 9 It is a schematic diagram of the connecting pipe of the present invention; Fig.10 It is a partial half-section plan view of the present invention; Fig.11 A bottom view of the present invention; Fig.12 is a cross-sectional view of the pressure chamber of the present invention; Fig.13 A partial upward view of the present invention Figure 1 ; Fig.14 A partial upward view of the present invention Figure 2 .

[0026] In the figure: 100 upper mold, 200 lower mold, 300 gate, 400 mold plate, 500 cavity, 600 traction piece; 11 fixing plate, 12 template, 13 mold core, 14 positioning block; 401 fitting portion, 402 twisting portion, 403 connecting portion, 404 boss, 405 spherical groove, 406 positioning ring, 407 bucket groove; 21 jacking rod, 22 pressure chamber, 23 elastic member, 24 push plate; 601 base plate, 602 torsion rod, 603 telescopic member; a31 rotating shaft, a32 driving member, a33 clamping plate, a34 top block, a35 hydraulic chamber; b31 bracket, b32 hydraulic pipe, b33 connecting pipe, b34 sealing head, b35 magnetic plate, b36 electromagnet, b37 connecting head; 31 cooling chamber, 32 inlet, 33 outlet. DETAILED DESCRIPTION

[0027] The following will disclose multiple embodiments of the present invention with the accompanying drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not necessary. And if it is possible to implement, the features of different embodiments can be applied interchangeably.

[0028] Unless otherwise defined, all words (including technical and scientific terms) used herein have their usual meanings, which can be understood by those familiar with this field. Furthermore, the definitions of the above words in commonly used dictionaries should be interpreted in the content of this specification as consistent with the meanings of the relevant fields of the present invention. Unless otherwise clearly defined, these words will not be interpreted as idealized or overly formal meanings.

[0029] The following is an explanation of the relationships and terms used in this application: Parallel: The parallelism defined in this application is not limited to absolute parallelism. This definition of parallelism can be understood as basic parallelism, which allows for non-absolute parallelism due to factors such as assembly tolerance, design tolerance, and the influence of structural flatness. Small angular errors are allowed. For example, an assembly error range of less than 10 degrees can be understood as a parallel relationship.

[0030] Vertical: The verticality defined in this application is not limited to an absolute vertical intersection relationship (angle of 90 degrees). It allows for non-absolute vertical intersection relationships caused by factors such as assembly tolerance, design tolerance, and influence of structural flatness. It also allows for errors in a small angle range. For example, the assembly error range of 80 to 100 degrees can be understood as a vertical relationship.

[0031] The above explanation does not completely include the relationship definitions given in this application, but only represents part of it.

[0032] The present invention provides an injection mold for a light guide anti-light leakage structure of a vehicle lamp, which is used for injection molding the light guide anti-light leakage structure, changing the ejection demoulding method, and controlling the anti-light leakage structure to be separated from the mold by twisting and changing the mold state, thereby avoiding surface problems caused by ejection of the ejector.

[0033] like Figure 1-Figure 4 As shown, in one embodiment, the injection mold includes: an upper mold 100 and a lower mold 200, a cavity 500 for injection molding the light leakage prevention structure is provided between the upper mold 100 and the lower mold 200, a gate 300 is provided in the middle of the upper mold 100 and extends into the cavity 500, and the melted injection material is injected into the cavity 500 through the gate 300; Injection molds also include: The mold plate 400 is arranged on the upper part of the lower mold 200, the bottom wall of the mold plate 400 is fitted with the top wall of the lower mold 200, 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 portion 401 forming the inner wall of the cavity 500, a twisting portion 402 located at the edge of the mold plate 400, and a connecting portion 403 connecting the fitting portion 401 and the twisting portion 402, and the twisting portion 402 is provided with a groove; A traction member 600 is provided at the bottom of the template 400 and is connected to the torsion portion 402 . The traction member 600 drives the torsion portion 402 to torsion, and the traction member 600 pulls the template 400 to cause the template 400 to deform.

[0034] In one feasible method, the mold plate 400 is used to form the bottom wall of the cavity 500. When the injection molded part is demolded, the mold plate 400 is lifted up, and the traction member 600 is used to drive the mold plate 400 to twist, so that the cavity 500 formed by the mold plate 400 is deformed, so that the injection molded part can be separated from the mold plate 400. The mold plate 400 has a small thickness and is a rigid structure. After the mold plate 400 is bent, a gap is generated in the connection between the injection molded part and the mold plate 400, so that the injection molded part is separated from the cavity 500.

[0035] The torsion portion 402 is provided with a groove to distinguish the torsion states at different positions, 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.

[0036] When the mold plate 400 is attached to the lower mold 200, the mold plate 400 is restricted by the lower mold 200 and will not bend, thereby ensuring the stability of the injection molded part during the injection molding and cooling process. In order to ensure that the injection molded part adheres to the mold plate 400 during demoulding, the surface of the mold plate 400 is specially treated, such as polishing or coating, 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 processing method of the mold plate 400, and the injection molded part can be located inside the lower mold 200 after demoulding.

[0037] It should be noted that the adhesion between the injection molded part and the mold plate 400 is to facilitate the subsequent part removal operation. Compared with the injection molded part adhering to the upper mold plate 100 or not adhering, the adhesion between the injection molded part and the mold plate 400 can avoid the injection molded part from falling or position deviation, which is more conducive to grabbing the injection molded part.

[0038] like Figure 2-Figure 5As shown, in one embodiment, the upper mold 100 and the lower mold 200 are both composed of a fixed plate 11, a template 12, a mold core 13 and a positioning block 14, wherein the fixed plate 11, the template 12, the mold core 13 and the positioning block 14 are all arranged up and down, respectively corresponding to the upper mold 100 and the lower mold 200, the template 12 is located between the fixed plates 11, the mold core 13 is located inside the template 12, and the cavity 500 is opened on the inner side of the upper mold 100, and the lower mold 200 supports the mold plate 400; The positioning block 14 of the upper mold 100 engages with the positioning block 14 of the lower mold 200 to position the upper mold 100 and the lower mold 200 .

[0039] In one feasible method, optionally, the upper mold 100 and the lower mold 200 are connected via guide pillars, which are installed in the lower mold 200 and extend toward the upper mold 100. Bolts are configured inside the upper mold 100 and are spirally installed inside the guide pillars to fix the upper mold 100 and the lower mold 200.

[0040] like Figure 10-12 As shown, in one embodiment, a boss 404 is provided at the bottom of the torsion portion 402, the boss 404 is concave to form a spherical groove 405, and the traction member 600 extends into the spherical groove 405; A lifting rod 21 is disposed at the bottom of the traction member 600, and the lifting 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 bottom of the lifting rod 21 is a pressure chamber 22, which is fixed inside the lower mold 200. The lifting rod 21 extends into the pressure chamber 22, and the pressure chamber 22 is filled with a medium. An elastic member 23 is configured on the bottom wall of the pressure chamber 22, and a push plate 24 is provided on the top of the elastic member 23 to support the push plate 24.

[0041] In one feasible manner, the setting of the pressure chamber 22 can change with the position of the lifting rod 21. When the lifting rod 21 is squeezed, that is, the upper mold 100 and the lower mold 200 are connected and fixed during injection molding, the lifting rod 21 retracts, so that the medium pressure inside the pressure chamber 22 increases, thereby squeezing the push plate 24, and the push plate 24 moves downward, and the elastic member 23 is subjected to force. After the upper mold 100 and the lower mold 200 are removed, the rebound effect of the elastic member 23 pushes the push plate 24 to push the lifting rod 21 outward, thereby pushing out the traction member 600.

[0042] 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.

[0043] Alternatively, the elastic member 23 is two repelling magnets, and the repulsive force of the magnets is used to reset the push plate 24.

[0044] 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 synchronously by the lifting rod 21 , so that the mold plate 400 can be lifted up immediately after the upper mold 100 is separated from the lower mold 200 .

[0045] like Figure 5-Figure 6 as well as Fig.13 As shown, in one embodiment, the traction member 600 includes: Base plate 601, disposed inside lower mold 200 and connected to lifting rod 21; The torsion rod 602 has one end close to the mold plate 400 and is spherical and extends into the spherical groove 405, and the other end of the torsion rod 602 extends into the lower mold 200. A telescopic member 603 is provided between the torsion rod 602 and the base plate 601 to change the telescopic length of the torsion rod 602; The template 400 is provided with at least six bosses 404 corresponding to the torsion rods 602. When the torsion portion 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 torsion rod 602 is extended and retracted to change the highest point to twist the template 400.

[0046] In one feasible method, the mold plate 400 is twisted by utilizing the height change of the torsion rod 602, thereby changing the height state of the mold plate 400 at different positions and achieving a corresponding torsion effect, and the groove body opened by the torsion portion 402 can reduce the force required to twist the mold plate 400. When twisting, it is not necessary to apply excessive torsional force to the mold plate 400, and the injection molded part can be separated from the mold plate 400. Therefore, a groove body is opened to determine the torsion range.

[0047] The present application does not limit the specific number and position of the torsion rods 602. The number and position of the torsion rods 602 can be determined according to the different structures of the anti-light leakage structure and the different shapes of the template 400. For example, in the present application, the number of the torsion rods 602 is six, and the positions of the torsion rods 602 are symmetrically arranged front to back and left to right.

[0048] like Fig.10 As shown, in one embodiment, the telescopic member 603 includes: A rotating shaft passes through the lower mold 200 and can rotate relative to the lower mold 200, and a driving member a32 is provided at one end of the rotating shaft for driving the rotating shaft to rotate; The clamping plate a33 is fixed to the outer side of the torsion rod 602, and a top block a34 is arranged at the position of the rotating shaft corresponding to the clamping plate a33, and the rotating shaft rotates to push the top block a34 to move upward; A hydraulic chamber a35 is provided on the top of the base plate 601, and the torsion rod 602 extends into the hydraulic chamber a35. When the rotating shaft rotates to support the torsion rod 602 to move upward, the pressure inside the hydraulic chamber a35 increases; The setting angle of the top block a34 is based on the twisted state of the mold plate 400 corresponding to the injection molded part being separated from the mold plate 400.

[0049] In one practicable manner, the rotating shaft is driven to rotate by a driving member a32, and by using a top block a34 set at different angles, the torsion rod 602 can be used to twist the mold plate 400, so that the injection molded part can be separated from the adhesion to the mold plate 400. The setting angle of the top block a34 is determined according to the torsion change of the mold plate 400 required for the injection molded part to be separated from the mold plate 400.

[0050] Since the rotating shaft and the top block a34 are fixedly connected, the height of the torsion rod 602 is changed by the top block a34 during the rotation of the rotating shaft. Therefore, correspondingly, the torsion angle of the template 400 that can be achieved by each rotating shaft is a fixed angle. In order to be able to adjust the torsion angle, the rotating shaft is detachably installed.

[0051] A fastener is disposed on the outer side of the rotating shaft, and the fastener is installed on the inner side of the lower mold 200 by means of screws. The fastener cooperates with the lower mold 200 to position the rotating shaft.

[0052] In another embodiment, the driving member a32 is a servo motor, which is installed at the lower mold 200 and has an output end connected to the rotating shaft. The servo motor drives the rotating shaft to rotate.

[0053] In another optional embodiment, meshing gears are installed at 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 gears.

[0054] like Figure 7-Figure 9 As shown, in one embodiment, the telescopic member 603 includes: The bracket b31 is fixed on the upper part of the base plate 601. A hydraulic pipe b32 is arranged inside the bracket b31. The torsion rod 602 extends into the inside of the hydraulic pipe b32. The hydraulic pipe b32 extends to the outside of the lower mold 200. The connecting pipe b33 is installed on the outside of the hydraulic pipe b32. The sealing head b34 is installed on the inside of the connecting pipe b33 to seal the hydraulic pipe b32. A magnetic plate b35 is arranged at one end of the sealing head b34. An electromagnet b36 is arranged inside the connecting pipe b33. The electromagnet b36 changes the sealing state of the sealing head b34 for the hydraulic pipe b32 by cooperating with the magnetic force of the magnetic plate b35. One end of the connecting pipe b33 is set as a connecting head b37.

[0055] In one implementable method, one end of the connector b37 is connected to the hydraulic component, and the connector b37 is connected through the hydraulic component to increase the amount of medium inside the hydraulic pipe b32, thereby realizing the control of the torsion state of the mold plate 400. The electromagnet b36 and the magnetic plate b35 repel or attract each other to change the position of the sealing head b34, thereby controlling the connection state between the connecting pipe b33 and the hydraulic pipe b32.

[0056] In another embodiment, the hydraulic pipe b32 corresponding to each torsion rod 602 is separately connected to the hydraulic assembly, and the hydraulic assembly controls the amount of medium inside each hydraulic pipe b32 respectively.

[0057] In another optional embodiment, the telescopic member 603 is an electric telescopic rod, which is used to control the extension length of the torsion rod 602. 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.

[0058] like Figure 10-11 As shown, in one embodiment, a cooling cavity 31 is provided inside the lower mold 200, and the cooling cavity 31 is provided with at least two inlets 32 and two outlets 33; Both the inlet 32 ​​and the outlet 33 extend inside the lower mold 200; 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 .

[0059] In one feasible manner, the mounting head is used to connect the cooling pipe of the cooling system, and the two inlets 32 and outlets 33 are used for air cooling and water cooling respectively, that is, the inlet 32 ​​and the outlet 33 form a separate cooling circulation path, and the air cooling and the water cooling are mixedly cooled in the cooling chamber 31. In the cooling chamber 31, the water cooling is at the bottom of the cooling chamber 31 due to its own mass, and the air cooling is at the top where the cooling is strong.

[0060] like Figure 4 , Fig.10 as well as Fig.14 As shown, in one embodiment, the two inlets 32 and the outlet 33 are arranged up and down, the lower inlet 32 ​​and the lower outlet 33 both extend to the bottom wall of the cooling chamber 31, the upper inlet 32 ​​and the lower inlet 32 ​​are located on the side wall of the cooling chamber 31, and the bottom wall of the cooling chamber 31 is bucket-shaped and inclined.

[0061] In one feasible manner, the lower inlet 32 ​​and the lower outlet 33 are located on the bottom wall of the cooling chamber 31, and both the lower inlet 32 ​​and the lower outlet 33 are used for water cooling. The bucket-shaped setting of the bottom wall of the cooling chamber 31 can facilitate the guidance of the coolant, thereby ensuring the stable recovery of the coolant.

[0062] like Figure 4 as well as Figure 13-14 As shown, in one embodiment, a positioning ring 406 is disposed at the bottom of the template 400, and a bucket groove 407 is disposed at the position of the lower mold 200 corresponding to the positioning ring 406, and the bucket groove 407 cooperates with the positioning ring 406 to position the template 400; The lower mold 200 limits the movement of the connection position between the torsion rod 602 and the boss 404 to maintain the stability of the mold plate 400 and the torsion rod 602.

[0063] In one feasible method, the template 400 is positioned to 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. The bucket groove 407 is larger than the positioning ring 406. During installation, when the template 400 is matched with the lower mold 200, the position of the template 400 can be quickly adjusted by using the bucket groove 407 and the positioning ring 406 to ensure the matching accuracy of the template 400 and the lower mold 200.

[0064] The present application also provides an injection molding method for a vehicle lamp light guide anti-light leakage structure, which is used for the above-mentioned injection molding mold, comprising the following steps: The upper mold 100 is combined with the lower mold 200 to fix the upper mold 100 and the lower mold 200; 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 air cooling and water cooling to perform cooling circulation; After cooling is completed, the upper mold is removed, and the traction member 600 pushes the mold plate 400 upward and controls the height of the torsion portion 402; The height change of the twisting portion 402 controls the twisting of the mold plate 400 , and the injection molded part is separated from the mold plate 400 .

[0065] In summary, the technical solutions disclosed in the above embodiments of the present invention have at least the following advantages: 1. The present application avoids the surface defects and ejection marks caused by ejection after injection molding by adjusting the demoulding method of the injection molded parts, thereby ensuring the integrity of the surface and further improving the surface quality of the injection molded parts. The injection molded parts are separated from the mold plate by twisting, and the injection molded parts are completely demoulded to ensure the demoulding quality of the injection molded parts.

[0066] 2. The template is divided into a torsion portion, a fitting portion and a connection portion. The torsion portion can be easily connected to a traction member to pull the torsion portion of the template. The template is twisted 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 to the template.

[0067] 3. Use telescopic parts to control the height position of the template so that the template can be in a torsion state of different degrees. After the template is twisted, ensure that a gap will be created between the injection molded part and the template so that the injection molded part can be separated from the template.

[0068] 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 enter the cooling chamber respectively, mix inside the cooling chamber, and are recovered after separation in the cooling chamber.

[0069] Although the present invention is disclosed in conjunction with the above embodiments, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the attached claims.

Claims

1. An injection mold for a light guide and light leakage prevention structure for a vehicle lamp, comprising: An upper mold (100) and a lower mold (200), a mold cavity (500) for injection molding a light leakage prevention structure is provided between the upper mold (100) and the lower mold (200), a gate (300) is provided in the middle of the upper mold (100) and extends into the mold cavity (500); the injection mold further comprises: The mold plate (400) is arranged on the upper part of the lower mold (200), the bottom wall of the mold plate (400) is fitted with the top wall of the lower mold (200), the top wall of the mold plate (400) and the upper mold (100) form a complete inner wall of the mold cavity (500), the mold plate (400) comprises a fitting portion (401) forming the inner wall of the mold cavity (500), a twisting portion (402) located at the edge of the mold plate (400), and a connecting portion (403) connecting the fitting portion (401) and the twisting portion (402), and the twisting portion (402) is provided with a groove body; A traction member (600) is provided at the bottom of the template (400) and is connected to the torsion portion (402). The traction member (600) drives the torsion portion (402) to torsion, and the traction member (600) pulls the template (400) to cause the template (400) to deform.

2. The injection mold for the light guide and anti-light leakage structure of a vehicle lamp according to claim 1, characterized in that: The upper mold (100) and the lower mold (200) are both composed of a fixed plate (11), a template (12), a mold core (13) and a positioning block (14), wherein the fixed plate (11), the template (12), the mold core (13) and the positioning block (14) are arranged up and down, respectively corresponding to form the upper mold (100) and the lower mold (200), the template (12) is located between the fixed plates (11), the mold core (13) is located inside the template (12), and the mold cavity (500) is opened on the inner side of the upper mold (100) core, and the lower mold (200) core supports the mold plate (400); The positioning block (14) of the upper die (100) engages with the positioning block (14) of the lower die (200) to position the connection between the upper die (100) and the lower die (200).

3. The injection mold for the light guide and anti-light leakage structure of a vehicle lamp according to claim 2, characterized in that: A boss (404) is provided at the bottom of the torsion portion (402), the boss (404) is concave to form a spherical groove (405), and the traction member (600) extends into the interior of the spherical groove (405); A lifting rod (21) is disposed at the bottom of the traction member (600), and the lifting 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 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 arranged on the bottom wall of the pressure chamber (22), and a push plate (24) is arranged on the top of the elastic member (23), and the elastic member (23) supports the push plate (24).

4. The injection mold for the light guide and anti-light leakage structure of a vehicle lamp according to claim 3, characterized in that: The traction member (600) comprises: A base plate (601) is disposed inside the lower mold (200) and connected to the lifting rod (21); The torsion rod (602) has one end close to the mold plate (400) which is spherical and extends into the spherical groove (405), and the other end of the torsion rod (602) extends into the lower mold (200). A telescopic member (603) is provided between the torsion rod (602) and the base plate (601) to change the telescopic length of the torsion rod (602); The mold plate (400) is provided with at least six bosses (404) corresponding to the torsion rods (602); when the torsion portion (402) of the mold plate (400) is a plane, the highest point of the torsion rod (602) is in a plane parallel to the upper surface of the mold plate (400); the torsion rod (602) is extended and retracted to change the highest point to torsion the mold plate (400).

5. The injection mold for the light guide and anti-light leakage structure of a vehicle lamp according to claim 4, characterized in that: The telescopic member (603) comprises: A rotating shaft passes through the lower die (200) and is rotatable relative to the lower die (200); a driving member (a32) is provided at one end of the rotating shaft for driving the rotating shaft to rotate; The clamping plate (a33) is fixed on the outside of the torsion rod (602), and a top block (a34) is arranged at a position of the rotating shaft corresponding to the clamping plate (a33), and the rotating shaft rotates to push the top block (a34) to move upward; A hydraulic chamber (a35) is provided on the top of the base plate (601), and the torsion rod (602) extends into the hydraulic chamber (a35). When the rotating shaft rotates to support the torsion rod (602) to move upward, the pressure inside the hydraulic chamber (a35) increases. The setting angle of the top block (a34) is based on the twisting state of the mold plate (400) corresponding to the injection molded part being separated from the mold plate (400).

6. The injection mold for the light guide and anti-light leakage structure of a vehicle lamp according to claim 4, characterized in that: The telescopic member (603) comprises: A bracket (b31) is fixed to the upper part of the base plate (601), a hydraulic pipe (b32) is arranged inside the bracket (b31), a torsion rod (602) extends into the inside of the hydraulic pipe (b32), and the hydraulic pipe (b32) extends to the outside of the lower mold (200); The connecting pipe (b33) is installed on the outside of the hydraulic pipe (b32). A sealing head (b34) is installed on the inside of the connecting pipe (b33) to seal the hydraulic pipe (b32). A magnetic plate (b35) is arranged at one end of the sealing head (b34). An electromagnet (b36) is arranged inside the connecting pipe (b33). The electromagnet (b36) changes the sealing state of the sealing head (b34) with respect to the hydraulic pipe (b32) by cooperating with the magnetic force of 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 and anti-light leakage structure for a vehicle lamp according to claim 5 or 6, characterized in that: A cooling cavity (31) is disposed inside the lower mold (200), and the cooling cavity (31) is configured with at least two inlets (32) and two outlets (33); Both the inlet (32) and the outlet (33) extend inside the lower mold (200); 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).

8. The injection mold for the light guide and anti-light leakage structure of a vehicle lamp according to claim 7, characterized in that: The two inlets (32) and the outlet (33) are arranged up and down, the lower inlet (32) and the lower outlet (33) both extend to the bottom wall of the cooling chamber (31), the upper inlet (32) and the lower inlet (32) are located on the side wall of the cooling chamber (31), and the bottom wall of the cooling chamber (31) is arranged in a bucket shape and tilted.

9. The injection mold for the light guide and anti-light leakage structure of a vehicle lamp according to claim 8, characterized in that: A positioning ring (406) is disposed at the bottom of the mold plate (400), and a bucket groove (407) is provided on the lower mold (200) at a position corresponding to the positioning ring (406), and the bucket groove (407) cooperates with the positioning ring (406) to position the mold plate (400); The lower mold (200) limits the movement of the connection position between the torsion rod (602) and the boss (404), thereby maintaining the stability of the mold plate (400) and the torsion rod (602).

10. A method for injection molding a light guide and anti-leakage structure for a vehicle lamp, used for an injection mold according to any one of claims 1 to 9, characterized in that: The following steps are involved: The upper mold (100) is combined with the lower mold (200) to fix the upper mold (100) and the lower mold (200); The raw material enters the mold 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 air cooling and water cooling to perform cooling circulation; After cooling is completed, the upper mold is removed, and the pulling member (600) pushes the mold plate (400) upwards to control the height of the torsion portion (402); The height change of the twisting portion (402) controls the twisting of the mold plate (400), so that the injection molded part is separated from the mold plate (400).

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