A car lamp shell integrated injection molding and polishing mold and variable temperature forming process

Abstract

The application belongs to the technical field of injection molding machines, and particularly relates to a vehicle lamp shell integrated injection molding and polishing mold and a variable temperature forming process, which comprises a front mold, a rear mold and a heating module. A forming cavity is formed in the rear mold. A spraying module is arranged in the cavity in a retractable manner. The spraying module is used for spraying a release agent to the inner wall of the cavity. The heating module is arranged in the rear mold. The heating module preheats the rear mold and evaporates the moisture of the release agent sprayed on the inner wall of the cavity. The mold further comprises a ejector pin module. The ejector pin module comprises an ejector pin plate and a plurality of ejector pins connected to the ejector pin plate. The plurality of ejector pins penetrate through the through holes on the rear mold and lead to the cavity. The spraying module is arranged on the front end side wall of the ejector pin. The spraying module sprays the release agent to the inner wall of the cavity when the spraying module retracts into the through hole along with the ejector pin. The mold can avoid the first injection material and the second injection material from being unable to be well bonded due to improper spraying of the release agent, and improve the stability of the injection molded product.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of injection molding machines, and particularly relates to a car lamp shell integrated injection molding and polishing mold and a variable temperature forming process. BACKGROUND

[0002] The variable temperature forming process is an advanced forming technology for fusing multiple plastics of different temperatures or materials and colors into a single product through single or multiple injection molding, and is mainly realized by a double-color injection molding machine. The core lies in realizing layer-by-layer combination of materials under precise control by using a special mold and a double-barrel injection molding equipment. The double-color injection molding machine is usually equipped with two independent barrels and nozzle systems, which can control the temperature, pressure and injection speed of different materials respectively, to ensure the compatibility of the two melts at the combination interface; the mold design adopts a rotary, sliding or rotary table structure, which precisely switches the cavity position through mechanical action, so that the semi-finished product can be transferred to the second injection cavity after the first injection molding without demolding, thereby reducing the process interval and improving the precision.

[0003] When producing a car lamp shell through a double-color injection molding process, since the car lamp product usually has a complex structure, high precision requirements and strict standards for the smoothness of the shell surface, in order to reduce the friction between the product and the mold and avoid problems such as scratching, deformation or mold sticking, a release agent needs to be added to ensure that the transparent part (such as PMMA or PC material) formed by the first injection molding can be smoothly demolded from the mold, so as to facilitate subsequent mold transfer and coating operations. The use of release agent can protect the surface quality of the product to some extent and improve the production efficiency.

[0004] However, improper use of release agent also has certain risks in the double-color injection molding process. Since the spraying of release agent needs manual operation, if the spraying range of release agent is not properly controlled, it may be left on the bonding surface of the two injection materials, forming an "isolating layer", which prevents the second injection material from forming good adhesion with the first injection material, and further causes defects such as poor adhesion, delamination and peeling, affecting the long-term reliability of the product. Based on this, a car lamp shell integrated injection molding and polishing mold and a variable temperature forming process are proposed. SUMMARY

[0005] To solve the above problems in the prior art, the application provides a car lamp shell integrated injection molding and polishing mold and a variable temperature forming process.

[0006] The purpose of the application can be achieved by the following technical solutions:

[0007] The application discloses a car lamp shell integrated injection molding and polishing mold.

[0008] Further, the application further comprises a turnover assembly and a ejector pin module, the rear mold is slidably arranged on the turnover assembly, the ejector pin module is arranged on the turnover assembly, the ejector pin module comprises an ejector pin plate and a plurality of ejector pins connected to the ejector pin plate, the plurality of ejector pins penetrate through the through holes on the rear mold and lead to the cavity, and the spraying module is arranged on the side wall of the front end of the ejector pin.

[0009] Further, the spraying module comprises a plurality of spray heads and a release agent tank, the plurality of spray heads are arranged on the side wall of the front end of the ejector pin, the release agent tank is arranged outside the cavity, the spray heads and the release agent tank are communicated through a water pipe, and the ejector pin is retracted into the through hole and presses the spray head to spray the release agent on the inner wall of the cavity.

[0010] Further, the side wall of the front end of the ejector pin is provided with a groove, the back surface of the spray head close to the front end of the ejector pin is provided with a spring connected to the groove, the side of the spray head away from the front end of the ejector pin is hinged to the edge of the groove, the spray head is provided with a valve at the hinged position, a valve rod on the valve is connected to the outside of the spray head and fixed in the ejector pin, an angle is formed between the valve channel and the extension direction of the ejector pin, so that the valve is closed when the spray head is completely tilted or completely parallel to the ejector pin, and the valve is opened when the spray head is pressed and rotated into the groove.

[0011] Further, the application further comprises a cooling module, the cooling module comprises a first cooling channel and a second cooling channel arranged on the front mold and the rear mold respectively, and the first cooling channel and the second cooling channel are communicated to a cooling water tank.

[0012] Further, the front mold and the rear mold are provided with two groups of cavities, the ejector pin module has two groups and corresponds to the two groups of cavities respectively, and the two groups of ejector pin modules are connected to the turnover assembly.

[0013] Further, the first hydraulic cylinder and the second hydraulic cylinder are arranged between the two groups of ejector pin modules and the turnover assembly respectively, so as to push the ejector pins in the through holes to retract or extend.

[0014] Further, the application further comprises a second heating module, the second heating module is arranged in the front mold and is used for heating the injection channel in the front mold and keeping the material in a molten state.

[0015] Further, the front mold is provided with an injection flow channel.

[0016] A car lamp shell integrated injection molding temperature forming process, comprising the following steps:

[0017] S1: separate the front mold and the rear mold of the injection molding machine;

[0018] S2: spray water-based release agent to the inner wall of the rear mold cavity of the injection molding machine by extruding the spray head when the ejector pin is retracted;

[0019] S3: heat the rear mold to 80~120℃ by the first heating module, evaporate the water in the water-based release agent adhered to the inner wall of the rear mold cavity, and preheat the mold for 30~60 seconds;

[0020] S4: after the water is evaporated and the effective components of the water-based release agent are adhered to the inner wall of the rear mold cavity, inject cooling liquid into the first cooling channel and the second cooling channel to cool the front mold and the rear mold to the injection molding temperature;

[0021] S5: clamp and perform the first injection, after the first injection is completed, separate the front mold and the rear mold and turn over the rear mold by the turnover assembly;

[0022] S6: clean the adhesion surface of the shell and the rear mold, clamp and perform the second injection;

[0023] S7: inject cooling liquid into the first cooling channel and the second cooling channel again to cool and shape, open the mold and take out the shell product.

[0024] The beneficial effects of the present application are:

[0025] 1. The first heating module inside the rear mold heats the rear mold before the first injection, which can eliminate cold mold stress, avoid rapid solidification of the material when contacting the low-temperature mold, resulting in insufficient filling, and avoid flow marks, obvious weld lines, uneven gloss, etc. caused by cold mold, and also balance the shrinkage rate, uniform mold temperature can also reduce the risk of product warping deformation; on the other hand, by heating the rear mold, the water in the water-based release agent can be quickly evaporated before clamping, only the effective components of the water-based release agent are adhered to the inner wall of the rear mold cavity, preventing the water-based release agent from flowing to the joint surface of the first injection and the second injection during the injection process. After heating by the first heating module, the water-based release agent forms a film on the inner wall of the rear mold cavity, which can be quickly demolded after injection, making the outer surface of the car lamp shell smooth;

[0026] 2. Make a certain angle between the ball valve channel and the extension direction of the ejector pin. In this case, since the ejector pin extends quickly when it extends out of the through hole, it can push out the headlight housing on the rear mold cavity. Therefore, the ejector pin extends out of the through hole at a relatively fast speed. During this process, the nozzle changes from straight to upturned. The nozzle is in a brief open state and completes a brief first spray on the inner wall of the cavity. Then, as the ejector pin slowly returns to its original position, the nozzle is squeezed and changes from upturned to straight. This process not only allows the nozzle to spray out the release agent, but also, with the retraction distance of the ejector pin, the nozzle swings and sprays, that is, sprays from the inside of the cavity to the outside, achieving full coverage of the spray. Attached Figure Description

[0027] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the retractable ejector pin structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the protruding ejector pin structure of the present invention;

[0030] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0031] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0032] Figure 5 This is a schematic diagram of the valve in the open state of the present invention;

[0033] Explanation of reference numerals in the attached drawings: 1. Rear mold; 2. Front mold; 3. Cavity; 4. Ejector pin; 5. Ejector plate; 6. First heating module; 7. Second heating module; 8. Injection runner; 9. Water pipe; 10. Valve; 11. Nozzle. Detailed Implementation

[0034] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0035] like Figures 1-5 As shown, an integrated injection molding and polishing mold for a vehicle headlight housing according to the present invention includes a front mold 2, a rear mold 1 and a heating module. A cavity 3 is formed inside the rear mold 1. A spraying module is telescopically arranged inside the cavity 3. The spraying module is used to spray a release agent onto the inner wall of the cavity 3. The heating module is arranged inside the rear mold 1. The heating module preheats the rear mold and evaporates the moisture of the release agent sprayed on the inner wall of the cavity 3.

[0036] In order to ensure the smoothness of the outer surface of the lamp shell after injection molding, it is necessary to avoid the adhesion of the material to the mold cavity 3 during injection molding. In the prior art, the automatic spraying of release agent is manually activated before injection molding. The injected release agent may be squeezed and pushed and remain on the bonding surface of the two injection materials, forming an "isolating layer", which prevents the second injection material from being well bonded to the first injection material, resulting in defects such as poor bonding, delamination, and peeling, which affect the long-term reliability of the product. In order to avoid this problem, a water-based release agent is sprayed onto the inner wall of the rear mold 1 cavity 3, and then the rear mold 1 is heated by the first heating module 6 inside the rear mold 1. The rear mold 1 is heated before the first injection, which can eliminate cold mold stress, avoid rapid solidification of the material when it contacts the low-temperature mold, and prevent problems such as flow marks, obvious weld lines, and uneven gloss. In addition, it can also balance the shrinkage rate, and uniform mold temperature can also reduce the risk of product warping deformation. On the other hand, heating the rear mold 1 can quickly evaporate the water in the water-based release agent before the mold is closed, leaving only the effective ingredients of the water-based release agent adhering to the inner wall of the rear mold 1 cavity 3, preventing the water-based release agent from flowing to the joint surface of the first and second injection materials during injection molding. After heating by the first heating module 6, the water-based release agent forms a thin film on the inner wall of the rear mold 1 cavity 3, which can be quickly demolded after injection molding, making the outer surface of the lamp shell smooth.

[0037] The reason for choosing a water-based release agent is that the water-based release agent uses water as a solvent or carrier, which contains effective release ingredients (such as wax, silicone oil, polymer, etc.), surfactants, stabilizers, and other additives. After use, the water evaporates, leaving a uniform release film. Oil-based release agents use mineral oil or synthetic oil as a carrier and do not contain water. After use, the oil does not evaporate, but remains on the surface of the mold, requiring long cleaning time before the next injection molding.

[0038] In the prior art, the mold is usually disassembled before spraying the water-based release agent, and then the mold cavity 3 is sprayed. Alternatively, the mold cavity 3 is sprayed from the outside when the mold is opened. However, this spraying method may result in uneven spraying, and the spraying method increases the operation steps, resulting in low production efficiency. In order to avoid this problem, in one embodiment, a turnover assembly and a ejector pin module 4 are also included. The rear mold 1 is slidingly arranged on the turnover assembly, and the ejector pin module 4 is arranged on the turnover assembly. The ejector pin module 4 includes an ejector pin plate 5 and a plurality of ejector pins 4 connected to the ejector pin plate 5. The plurality of ejector pins 4 penetrate the through holes of the rear mold 1 and lead to the cavity 3. A spraying module is arranged on the front end side wall of the ejector pin 4. The spraying module sprays the release agent to the inner wall of the cavity 3 when the ejector pin 4 retracts into the through hole.

[0039] The ejector pin 4 module is used to push the car lamp shell after the injection is completed, so that the car lamp shell is separated from the back mold 1, and the spraying module is arranged on the front end side wall of the ejector pin 4. During the injection process, the end of the ejector pin 4 and the inner wall of the cavity 3 of the back mold 1 form a complete plane, and after the injection is completed, the car lamp shell product is separated from the back mold 1 by the ejector pin 4, and the spraying module is stretched out of the through hole. At this time, the spraying module is still in the closed state. Then, the ejector pin 4 needs to be completely retracted before the next injection. With the action of the ejector pin 4 retracted into the through hole, the edge of the through hole will extrude the spraying module, so that the spraying module changes from the closed state to the open state under pressure and uniformly sprays the water-based release agent to the inner wall of the cavity 3. When the ejector pin 4 is completely retracted into the through hole, the spraying module is re-sealed by the inner wall of the through hole. Therefore, by arranging the spraying module on the front end side wall of the ejector pin 4 module and spraying the water-based release agent to the inner wall of the cavity 3 according to the action of the ejector pin 4 module, the operation steps can be saved, the work efficiency can be improved, and compared with the external spraying method, the spraying from the inner wall of the cavity 3 can also ensure more uniformity, avoiding too much or too little spraying in some areas.

[0040] Specifically, the spraying module includes a plurality of spray heads 11 and a release agent tank. The plurality of spray heads 11 are arranged on the front end side wall of the ejector pin 4, and the release agent tank is arranged outside the cavity 3. The spray heads 11 and the release agent tank are connected by a water pipe 9. The ejector pin 4 retracts into the through hole and extrudes the spray heads 11 to spray the release agent to the inner wall of the cavity 3. The water pipe 9 is arranged in the ejector pin 4 and extends to the outside of the back mold 1 along the ejector pin 4 to communicate with the external release agent tank. The release agent tank contains water-based release agent. In order to spray the release agent to the inner wall of the cavity 3 of the back mold 1 when the ejector pin 4 is retracted, a small water pump is connected to the end of the water pipe 9 in the release agent tank, which is used to continuously provide pressure to the water-based release agent in the release agent tank and spray the release agent in time when the spray head 11 is in the open state. Since the ejector pin 4 is located at the center of the cavity 3, in order to uniformly spray all areas of the inner wall of the cavity 3, a plurality of spray heads 11 need to be arranged around the front end circumferential surface of the ejector pin 4 at equal angles. Each spray head 11 can spray a certain angle area, and the combination of a plurality of spray heads 11 can realize full coverage of the inner wall of the cavity 3.

[0041] If the inner wall of the cavity 3 has a certain depth, if only through the nozzle 11 in the instant the ejector pin 4 retraction for a short time spraying, will result in the nozzle 11 only on the inner wall of the cavity 3 of a region of spraying, rather than complete spraying, and if the cavity 3 depth of the back mold 1 is deep, and the nozzle 11 only in the retraction hole in a moment can be sprayed, resulting in the area away from the hole end can not be covered, in order to avoid this problem, need to make the nozzle 11 in the spraying of a certain front and rear swing, expand the spraying range, therefore in an embodiment, the ejector pin 4 front end side wall is provided with a groove, the nozzle 11 close to the ejector pin 4 front end side of the back surface is provided with a spring connected to the groove, the nozzle 11 away from the ejector pin 4 front end side and the edge of the groove hinge, the nozzle 11 in the hinge position is provided with a valve 10, the valve stem on the valve 10 is connected to the outside of the nozzle 11 and fixed in the ejector pin 4, the valve 10 channel and the extension direction of the ejector pin 4 form an angle, so that the nozzle 11 completely up and completely parallel to the ejector pin 4 when the valve 10 is closed, the nozzle 11 is pressed and rotates into the groove when the valve 10 is opened;

[0042] When the ejector pin 4 is in the hole, the nozzle 11 is pressed in the groove, and is parallel to the ejector pin 4, at this time the spring between the groove and the nozzle 11 is compressed, and when the ejector pin 4 pushes out the car lamp shell after injection molding, the nozzle 11 is also pushed out, because of the loss of the force of the inner wall of the hole on the nozzle 11, so the nozzle 11 is upturned under the action of the spring and forms a certain bending angle, and in this state the nozzle 11 is in the closed state, can not spray the release agent, this is to avoid the ejector pin 4 needs long time exposed, the nozzle 11 is always in the state of spraying release agent, therefore through the design of the structure of the nozzle 11, the nozzle 11 can only be sprayed when compressed back.

[0043] Specifically, the spray head 11 is hinged to the edge of the recess away from the end of the ejector pin 4, so that the spray head 11 can rotate based on the hinge point. A valve 10 is arranged at the hinge point, which can be a ball valve. The valve stem of the ball valve is fixed to the side wall of the recess of the ejector pin 4, so that the valve stem cannot move relative to the ejector pin 4. At this time, the action of the spray head 11 itself can change the valve 10 from the closed state to the open state. In order to avoid the spray head 11 from continuously spraying the release agent when it is stretched out of the through hole, the ball valve is in the closed state when the spray head 11 is completely flat, and is also in the closed state when the spray head 11 is completely tilted. Only when the spray head 11 is between the completely tilted state and the completely flat state, the ball valve is in the open state. In order to achieve this effect, the channel of the ball valve needs to form a certain angle with the extension direction of the ejector pin 4. In this case, since the ejector pin 4 is stretched out of the through hole quickly to push the lamp housing on the cavity 3 of the back mold 1, the speed of the ejector pin 4 when it is stretched out of the through hole is relatively fast. Therefore, the spray head 11 changes from flat to tilted in this process, and the spray head 11 is in a short open state and completes a short first spraying to the inner wall of the cavity 3. Then, with the slow repositioning of the ejector pin 4, the spray head 11 is squeezed and changes from tilted to flat. This process not only makes the spray head 11 spray the release agent, but also makes the spray head 11 swing and spray as the ejector pin 4 retracts, i.e., from the inside to the outside of the cavity 3, achieving full coverage of the spraying.

[0044] Since the two-color injection molding needs to be performed twice by two different colors and two different materials, and the injection molding temperatures of the two different materials are different, in order to ensure that the two materials can be bonded together after injection molding and maintain a certain strength, the temperature of the first injection molding needs to be higher than that of the second injection molding. Therefore, in order to control the temperature inside the mold cavity 3 during the two injection moldings to reach the temperature suitable for injection molding, and to quickly cool the inside of the lamp housing after injection molding, a cooling module is further included in an embodiment. The cooling module includes first and second cooling channels arranged on the front mold 2 and the back mold 1 respectively. The first and second cooling channels are both connected to a cooling water tank and are respectively connected with a water pump. The water pump is electrically connected with a control module, and the control module controls the start and stop of the water pump to control the temperature of the mold. Temperature sensors are further arranged on the front mold 2 and the back mold 1 respectively and are electrically connected to the control module for control.

[0045] Further, the front mold 2 and the rear mold 1 are provided with two sets of cavities 3, the ejector pin 4 module has two sets and corresponds to the two sets of cavities 3 respectively, and the two sets of ejector pin 4 modules are connected to the turnover assembly; since double-color injection molding needs to be realized, two cavities 3 are needed on the mold of the injection molding machine, after the first injection molding is completed in one of the rear mold 1 cavities 3 and the first front mold 2, the mold is turned over to make the rear mold 1 cavity 3 and the internal semi-finished product after the first injection molding and the second front mold 2 close, and then the second injection molding is performed, so the mold needs to be turned over by the turnover assembly.

[0046] Further, the two sets of ejector pin 4 modules and the turnover assembly are respectively provided with a first hydraulic cylinder and a second hydraulic cylinder for pushing the through hole ejector pin 4 to extend and retract; the ejector pin 4 module only needs to push the finished car lamp shell product after two injection moldings, and the semi-finished product after only one injection molding does not need to be pushed, so the two sets of ejector pin 4 modules in the two cavities 3 cannot be started synchronously and need to act respectively. The first hydraulic cylinder and the second hydraulic cylinder are used for the action source of the two ejector pin 4 modules.

[0047] Further, it further includes a second heating module 7, the second heating module 7 is arranged in the front mold 2 and is used for heating the injection runner 8 in the front mold 2 and keeping the material in a molten state; the front mold 2 is provided with an injection runner 8, and the injection runner 8 is used for injection molding into the cavity 3. Since the injection runner 8 exists in the front mold 2, if the front mold 2 is not continuously heated, the material in the injection runner 8 of the front mold 2 will solidify, causing the injection runner 8 to be blocked, so the front mold 2 needs to be continuously heated during the injection molding process to ensure that the material in the injection runner 8 is in a molten state.

[0048] A car lamp shell integrated injection molding variable temperature forming process, comprising the following steps:

[0049] S1: separate the front mold 2 and the rear mold 1 of the injection molding machine;

[0050] S2: spray water-based release agent to the inner wall of the rear mold 1 cavity 3 by extruding the spray head 11 when the ejector pin 4 is retracted;

[0051] S3: heat the rear mold 1 to 80~120℃ by the first heating module 6, evaporate the water in the water-based release agent adhered to the inner wall of the rear mold 1 cavity 3, and preheat the mold, lasting for 30~60 seconds;

[0052] S4: after the water evaporates and the active ingredients of the water-based release agent adhere to the inner wall of the rear mold 1 cavity 3, inject cooling liquid into the first cooling channel and the second cooling channel to cool the front mold 2 and the rear mold 1 to the injection molding temperature;

[0053] S5: close the mold and perform the first injection molding, after the first injection molding is completed, separate the front mold 2 and the rear mold 1 and turn over the rear mold 1 by the turnover assembly;

[0054] S6: clean the contact surface of the shell and the back mold 1, close the mold and perform the second injection molding;

[0055] S7: inject the cooling liquid into the first and second cooling channels again to cool and shape, open the mold and take out the shell product.

[0056] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, equivalent change and modification of the above embodiments, which does not depart from the technical solution of the present application and is based on the technical essence of the present application, still belongs to the scope of the technical solution of the present application.

Claims

1. A mold for integrally injection molding and polishing a housing of a vehicle lamp, characterized by: The injection molding machine comprises a front mold, a rear mold and a first heating module, a cavity is formed in the rear mold, a spraying module is arranged in the cavity in a retractable manner, the spraying module is used for spraying release agent to the inner wall of the cavity, the first heating module is arranged in the rear mold, the first heating module preheats the rear mold and evaporates the moisture of the release agent sprayed on the inner wall of the cavity; The injection molding machine further comprises a turnover assembly and a ejector pin module, the rear mold is arranged on the turnover assembly in a sliding manner, the ejector pin module is arranged on the turnover assembly, the ejector pin module comprises an ejector pin plate and a plurality of ejector pins connected to the ejector pin plate, the plurality of ejector pins pass through through holes on the rear mold and extend into the cavity, the spraying module is arranged on the side wall of the front end of the ejector pin, and the spraying module sprays release agent to the inner wall of the cavity in action of the ejector pin extending out of and retracting into the through hole. The spraying module comprises a plurality of nozzles and a release agent tank, the plurality of nozzles are arranged on the side wall of the front end of the ejector pin, the release agent tank is arranged outside the cavity, the nozzles and the release agent tank are connected through a water pipe, the water pipe is arranged in the ejector pin, a small water pump is connected to the end of the water pipe in the release agent tank, the water pump is used for pumping out the water-based release agent in the release agent tank and continuously providing pressure to the nozzles, and the release agent is sprayed in time when the nozzles are in an open state. The side wall of the front end of the ejector pin is provided with a groove, the back surface of the nozzle close to the front end of the ejector pin is provided with a spring connected to the groove, the side of the nozzle away from the front end of the ejector pin is hinged to the edge of the groove, the nozzle is provided with a valve at the hinged position, the valve rod of the valve is connected to the outside of the nozzle and fixed in the ejector pin, and the valve channel and the extension direction of the ejector pin form an included angle, so that the valve is closed when the nozzle is completely tilted up and completely parallel to the ejector pin. When the ejector pin extends out of the through hole at a high speed, the nozzle changes from flat to tilted up in this process, the nozzle is in a short open state, and the first short-time spraying to the inner wall of the cavity is completed, then, with the slow reset of the ejector pin, the nozzle is squeezed and changes from tilted up to flat, this process not only enables the nozzle to spray release agent, but also enables the nozzle to swing and spray with the retracting distance of the ejector pin.

2. The integrally injection-molded and polished vehicle lamp housing of claim 1, wherein: The injection molding machine further comprises a cooling module, the cooling module comprises a first cooling channel and a second cooling channel arranged on the front mold and the rear mold respectively, and the first cooling channel and the second cooling channel are connected to a cooling water tank.

3. The integrally injection-molded and polished vehicle lamp housing of claim 1, wherein: The front mold and the rear mold are provided with two groups of cavities, and the ejector pin module has two groups and corresponds to the two groups of cavities respectively.

4. The integrally injection-molded and polished vehicle lamp housing of claim 3, wherein: First and second hydraulic cylinders are arranged between the two groups of ejector pin modules and the turnover assembly respectively to drive the ejector pins in the through holes to extend and retract.

5. The integrally injection-molded and polished vehicle lamp housing of claim 1, wherein: The injection molding machine further comprises a second heating module, the second heating module is arranged in the front mold and used for heating an injection channel in the front mold and keeping the material in a molten state.

6. The integrally injection-molded and polished vehicle lamp housing of claim 1, wherein: An injection runner is arranged on the front mold.

7. A process for integrally injection molding a vehicle lamp housing, suitable for use with a process for integrally injection molding a vehicle lamp housing as claimed in any one of claims 1-6, characterized by: The injection molding machine comprises the following steps: S1: separating the front mold and the rear mold of the injection molding machine; S2: the speed of the ejector pin when it extends from the through hole is fast, the nozzle changes from flat to upturn in this process, the nozzle is in a short open state and completes the first short-time spraying to the inner wall of the cavity, then, with the slow reset of the ejector pin, the nozzle is squeezed and changes from upturn to flat, this process not only makes the nozzle spray the release agent, but also makes the nozzle swing and spray as the retracting distance of the ejector pin; S3: the rear mold is heated to 80~120℃ by the first heating module, the water in the water-based release agent adhered to the inner wall of the rear mold cavity is evaporated and the mold is preheated, which lasts for 30~60 seconds; S4: after the water is evaporated and the active ingredients of the water-based release agent are adhered to the inner wall of the rear mold cavity, the front mold and the rear mold are cooled to the injection temperature by injecting cooling liquid into the first cooling channel and the second cooling channel; S5: the molds are closed and the first injection is carried out, after the first injection is completed, the front mold and the rear mold are separated and the rear mold is turned over by the turnover assembly; S6: clean the adhering surface of the shell and the rear mold, close the molds and carry out the second injection; S7: inject cooling liquid into the first cooling channel and the second cooling channel again to cool and shape, open the mold and take out the shell product.

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