CN113815179B

CN113815179B - Automobile rearview mirror mask, injection mold and injection molding method thereof

Info

Publication number: CN113815179B
Application number: CN202111090427.1A
Authority: CN
Inventors: 谢寿琴; 华碧辉; 陈学正; 葛军川
Original assignee: Ningbo Ruiyuan Mould & Plastics Co ltd
Current assignee: Ningbo Ruiyuan Mould & Plastics Co ltd
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2023-05-02
Anticipated expiration: 2041-09-17
Also published as: CN113815179A

Abstract

The invention relates to an automobile rearview mirror mask, which comprises a mask body and a light guide strip which are spliced together, wherein the mask body and the light guide strip are respectively provided with a first splicing surface and a second splicing surface at the positions of mutual splicing, one side of the light guide strip is provided with a splicing part, the mask body and the light guide strip are integrally formed, so that the first splicing surface and the second splicing surface are bonded together, and the splicing part and the mask body are laminated and bonded together; the injection mold comprises a fixed mold and a movable mold, wherein a water channel is further arranged on the fixed mold, and the water channel is externally connected with a steam mold temperature machine; the utility model also relates to an injection molding method, wherein the first injection molding forms the mask body with the bulge, then steam mould temperature machine lets in high temperature vapor to the water course, and the second injection molding forms the light guide strip that has the splice simultaneously and bonds mask body and light guide strip to solve among the prior art integrated into one piece's rear-view mirror face guard joint strength low, bond unstable technical problem.

Description

Automobile rearview mirror mask, injection mold and injection molding method thereof

Technical Field

The invention relates to the technical field of automobile accessories, in particular to an automobile rearview mirror mask, an injection mold and an injection molding method thereof.

Background

Light guide bars are typically mounted on the face shield of an automobile rearview mirror. The face guard and the light guide strip in traditional automobile rearview mirror products are two independent injection molding parts, namely, the face guard and the light guide strip are respectively independently developed into a mold, and the two parts are assembled together by using the installation buckle on the product after injection molding. The split rearview mirror mask product has the technical problems of long development period, high cost and low production efficiency. Besides, by adopting a product with a buckle for clamping, a gap exists between the two parts, and the gap leads to the problems that the product is easy to generate noise due to friction and high-speed running of a vehicle, and even causes light scattering of the light guide strip. Thus, a rearview mirror visor has been developed in which a visor and a light guide bar are integrally formed. In the existing rearview mirror mask formed integrally, the connection strength between the mask and the light guide strip is low and unstable, so that the mask is separated from the light guide strip after long-term use, and even the mask is separated from the light guide strip after injection molding and demolding.

Disclosure of Invention

Aiming at the defects of the prior art, the first aim of the invention is to provide an automobile rearview mirror mask with stable connection and high strength between a mask body and a light guide strip.

In order to solve the technical problems, the invention provides an automobile rearview mirror mask, which comprises a mask body and a light guide strip which are spliced together, wherein the mask body and the light guide strip are respectively provided with a first splicing surface and a second splicing surface at the positions of the first splicing surface and the second splicing surface, one side of the light guide strip is provided with a splicing part, the splicing part extends from one end of the second splicing surface to the direction of the mask body, the mask body and the light guide strip are integrally formed through a secondary injection molding process, so that the first splicing surface and the second splicing surface are bonded together, and the splicing part and the mask body are laminated and bonded together.

After adopting above-mentioned structure, the automobile rearview mirror face guard in the invention has following advantage: through setting up the splice and increased the area of contact between light guide bar and the face guard body, increased the bonding degree of light guide bar and face guard body in the secondary is moulded plastics greatly to strengthened the joint strength between face guard body and the light guide bar, made the two difficult emergence break away from, the connection is more stable.

As an improvement, the mask body is provided with a plurality of bulges extending towards the direction of the splicing part, the splicing part is provided with a plurality of bonding holes for accommodating the bulges, and when the mask body and the light guide strip are bonded together through secondary injection molding, the outer peripheral wall of each bulge is bonded with the inner peripheral wall of the corresponding bonding hole; by adopting the structure, the contact area between the mask body and the light guide strip is further increased by arranging the bulges and the bonding holes and bonding the bulges and the bonding holes, namely, the connection strength between the mask body and the light guide strip is further enhanced.

As an improvement, the bulges and the bonding holes are cylindrical, the diameter d of the bulges ranges from 1mm to 2mm, the thickness h of the splicing part ranges from 3mm to 5mm, and the width a of the splicing part ranges from 9mm to 12mm; if the value of d is too large, a splicing part with a larger size is needed, the material cost is increased, and if the value of d is too small, the processing difficulty is increased; if the values of h and a are too large, the material cost is increased, and if the values are too small, the effect of enhancing the connection strength between the mask body and the light guide strip is not good.

The second object of the invention is to provide an injection mold capable of producing an integrally formed automobile rearview mirror mask with more stable adhesion between a mask body and a light guide strip and higher product quality.

In order to solve the technical problems, the invention provides an injection mold for producing the automobile rearview mirror mask, which comprises an upper stacking template, a runner plate, a fixed mold, a movable mold, a stripper plate and a lower stacking template which are sequentially arranged from top to bottom, wherein a first cavity and a cavity assembly are arranged in the fixed mold, the cavity assembly comprises a third cavity and a second cavity, a rotating mechanism for driving the movable mold to rotate and a lifting mechanism for driving the movable mold to lift are arranged on the movable mold, two core assemblies are arranged in the movable mold, the two core assemblies are respectively positioned below the first cavity and the cavity assembly, and each core assembly comprises a first core and a second core; when the mold is closed, a first mold cavity for producing the mask body with the bulge is formed between the first mold cavity and the first mold core positioned below the first mold cavity, a second mold cavity for producing the light guide strip with the splicing part is formed between the second mold cavity and the second mold core positioned below the second mold cavity, and a third mold cavity for placing the mask body with the bulge is formed between the third mold cavity and the first mold core positioned below the third mold cavity; a water channel is also arranged on the fixed die and is positioned above the die cavity for producing the splicing part in the second die cavity, and the water channel is externally connected with a steam die temperature machine; the runner plate is provided with a first runner and a second runner, the fixed die is provided with a first glue inlet runner and a second glue inlet runner, the first glue inlet runner is communicated with the first runner and the first cavity, and the second glue inlet runner is communicated with the second runner and the second cavity.

After adopting above-mentioned structure, through first die cavity and first core production have bellied face guard body, second die cavity and second core production have the leaded light strip of splice, can make face guard body and leaded light strip at same injection mold internal integrated into one piece, pour into high temperature vapor through the water course by steam mould temperature machine to the aerial fog that produces when eliminating to form the bonding hole, improve the quality of product.

As an improvement, the first cavity, the cavity assembly and the core assembly all adopt mosaic structures; by adopting the structure, the processing of the first cavity, the cavity assembly and the core assembly is facilitated.

As an improvement, each core assembly is provided with an insert; by adopting the structure, the insert can be flexibly arranged in the core assembly according to the requirement, so that the required shape is achieved, and the product molding is facilitated.

As an improvement, a sliding block and a shovel machine are arranged on the movable die, an inclined guide post is arranged on the fixed die, the sliding block is arranged beside the core assembly in a sliding manner, the mask body comprises a pointed arc surface, a forming surface which is matched with the arc surface is arranged on the sliding block, the forming surface is positioned beside the core assembly and forms a complete core with the core assembly, the shovel machine presses the sliding block, a first inclined through hole is arranged on the sliding block, a second inclined through hole coaxial with the first inclined through hole is arranged on the shovel machine, and the inclined guide post is sequentially inserted into the second inclined through hole and the first inclined through hole during die assembly; because the face guard body is the arc structure, the degree of difficulty of directly processing the arc surface of pointed form is great in core subassembly, so adopt and process out this partial structure on the slider in order to simplify the mould structure, practice thrift development cost, the shaping of face guard body of being convenient for to can slide or change the slider according to the size difference of the product of production, make the operation more simple and convenient.

As an improvement, the stripper plate is a thimble plate, and an inclined top is arranged on the stripper plate; by adopting the structure, the product can be ejected out of the die after being obliquely propped against the product, and the operation is convenient.

The third object of the invention is to provide an injection molding method for producing an integrally formed automobile rearview mirror mask with more stable adhesion between a mask body and a light guide strip and higher product quality.

In order to solve the technical problems, the invention provides an injection molding method of an automobile rearview mirror mask, which adopts the injection mold and comprises the following steps:

s1, fixing an upper code template and a lower code template in an injection molding machine;

s2, preparing materials of the mask body and materials of the light guide strips after drying by a dehumidifying dryer;

s3, placing the material of the mask body into a first injection hopper of an injection molding machine, and placing the material of the light guide strip into a second injection hopper of the injection molding machine;

s4, the fixed die and the movable die are clamped, the temperature of the melt adhesive is controlled to be 260-270 ℃, the injection pressure is controlled to be 90-100 MPA, and materials of the mask body are injected into the first cavity from an injection hopper sequentially through the first runner and the first adhesive inlet runner to form the mask body with the protrusions;

s5, cooling for 25 to 30 seconds after injection molding;

s6, after cooling, the lifting mechanism drives the movable die to descend for die opening, the rotating mechanism drives the movable die to rotate 180 degrees, the lifting mechanism drives the movable die to ascend and the fixed die to be matched with the die again, and the mask body is moved into the third cavity;

s7, injecting steam with the temperature of 100-120 ℃ into a water inlet channel from a steam mould temperature machine, simultaneously injecting a light guide strip material into a second cavity from a two-shot hopper sequentially through a second runner and a second glue inlet runner to form a light guide strip with a splicing part, bonding the first splicing surface with the second splicing surface, bonding the splicing part with a mask body, and bonding the peripheral wall of each bulge with the inner peripheral wall of a corresponding bonding hole;

s8, the lifting mechanism drives the movable mould to descend for mould opening, the demoulding plate moves to demould the product, and finally, the part is taken by hand or a mechanical arm.

After the method is adopted, the mask body with the bulge is formed during the first injection molding, then the lifting mechanism and the rotating mechanism drive the movable mould to open the mould and carry out secondary mould closing, the light guide strip with the splicing part is formed during the secondary injection molding, the first splicing surface is bonded with the second splicing surface, the splicing part is bonded with the mask body, the bulge peripheral wall is bonded with the inner peripheral wall of the bonding hole, the contact area between the mask body and the light guide strip is increased, and meanwhile, the high-temperature steam introduced by the water channel eliminates the gas fog generated during the production of the bonding hole, and the product quality is improved.

As an improvement, the moisture weight ratio of the material of the mask body and the material of the light guide strip in the step S2 after drying is lower than 0.025%; the yield of the product can be improved.

Drawings

Fig. 1 is a schematic perspective view of the whole automobile rearview mirror mask according to the first embodiment of the invention.

Fig. 2 is a partial enlarged view of the portion a in fig. 1.

Fig. 3 is a schematic diagram of the overall structure of an injection mold in a third embodiment of the present invention.

Fig. 4 is a partial enlarged view of the portion B in fig. 3.

Fig. 5 is a schematic structural view of a stationary mold part in a third embodiment of the present invention.

Fig. 6 is a partial enlarged view of a portion C in fig. 5.

Fig. 7 is a schematic structural diagram of a movable mold part in a third embodiment of the present invention.

Fig. 8 is a partial enlarged view of a portion D in fig. 7.

Fig. 9 is a schematic bottom view of a rearview mirror visor and a waterway in a fixed mold according to a third embodiment of the present invention.

Fig. 10 is a partial enlarged view of the portion E in fig. 9.

Reference numerals: 1. a mask body; 2. a light guide bar; 3. a code template is arranged; 4. a flow channel plate; 41. a first flow passage; 42. a second flow passage; 5. a fixed mold; 51. a first cavity; 52. a cavity assembly; 521. a third cavity; 522. a second cavity; 53. a first glue inlet flow passage; 54. a second glue inlet flow passage; 6. a movable mold; 61. a core assembly; 611. a first core; 612. a second core; 7. removing the template; 71. a pitched roof; 8. a lower code template; 9. an insert; 10. a slide block; 101. a first inclined through hole; 102. molding surface; 11. a shovel; 111. a second inclined through hole; 12. oblique guide posts; 13. a first split surface; 14. a second split surface; 15. a splice; 16. a protrusion; 17. a bonding hole; 18. a water channel; 19. an arc surface.

Detailed Description

The automobile rearview mirror mask, the injection mold and the injection molding method of the invention are described in detail below with reference to the accompanying drawings.

Embodiment one:

as shown in fig. 1 and 2, the present embodiment discloses an automobile rearview mirror mask, which comprises a mask body 1 and a light guide bar 2 that are spliced together, wherein the mask body 1 and the light guide bar 2 are respectively provided with a first splicing surface 13 and a second splicing surface 14 at the mutual splicing position; a splicing part 15 is arranged on one side of the light guide strip 2, and the splicing part 15 extends from one end of the second splicing surface 14 towards the mask body 1; the mask body 1 is provided with a plurality of cylindrical bulges 16 extending towards the direction of the splicing part 15, and the splicing part 15 is provided with a plurality of cylindrical bonding holes 17 for accommodating the bulges 16; the mask body 1 and the light guide strip 2 are integrally formed through a secondary injection molding process, so that the first splicing surface 13 and the second splicing surface 14 are bonded together, the splicing part 15 and the mask body 1 are laminated and bonded together, and the outer peripheral wall of each protrusion 16 is bonded with the inner peripheral wall of the corresponding bonding hole 17; the diameter d of the protrusion 16 ranges from 1mm to 2mm, the thickness h of the splice 15 ranges from 3mm to 5mm, and the width a of the splice 15 ranges from 9mm to 12mm. In this embodiment, the diameter d of the protrusion 16 is 1mm, the thickness h of the splice 15 is 3mm, and the width a is 9mm.

Embodiment two:

the difference between this embodiment and the first embodiment is mainly that the diameter d of the protrusion 16 is 2mm, the thickness h of the splice 15 is 5mm, and the width a is 12mm.

Embodiment III:

as shown in fig. 3, the present embodiment discloses an injection mold for producing the automobile rearview mirror mask in the first or second embodiment, which comprises an upper code template 3, a runner plate 4, a fixed mold 5, a movable mold 6, a stripper plate 7 and a lower code template 8 which are sequentially arranged from top to bottom; as shown in fig. 5 and 6, the fixed mold 5 is provided therein with a first cavity 51 and a cavity assembly 52, each cavity assembly 52 including a third cavity 521 and a second cavity 522; the movable mould 6 is provided with a rotating mechanism for driving the movable mould 6 to rotate and a lifting mechanism for driving the movable mould 6 to lift, as shown in fig. 7 and 8, two core assemblies 61 are arranged in the movable mould 6, and the two core assemblies 61 are respectively positioned below the first cavity 51 and the cavity assembly 52; each core assembly 61 includes a first core 611 and a second core 612; when the mold is closed, a first mold cavity for producing the mask body 1 with the protrusion 16 is formed between the first mold cavity 51 and the first mold core 611 positioned below the first mold cavity, a second mold cavity for producing the light guide strip 2 with the splicing part 15 is formed between the second mold cavity 522 and the second mold core 612 positioned below the second mold cavity, and a third mold cavity for placing the mask body 1 with the protrusion 16 is formed between the third mold cavity 521 and the first mold core 611 positioned below the third mold cavity; as shown in fig. 9 and 10, the fixed mold 5 is also provided with a water channel 18, the water channel 18 is positioned above the cavity for producing the splicing part 15 in the second cavity 522, and the water channel 18 is externally connected with a steam mold temperature machine; as shown in fig. 3 and 5, a first runner 41 and a second runner 42 are arranged on the runner plate 4, a first glue inlet runner 53 and a second glue inlet runner 54 are arranged on the fixed mold 5, the first glue inlet runner 53 is communicated with the first runner 41 and the first cavity 51, and the second glue inlet runner 54 is communicated with the second runner 42 and the second cavity 522; as shown in fig. 3, 5 and 7, in the present embodiment, two sets of the first cavity 51, the cavity assembly 52 and the core assembly 61 are provided, that is, the first cavity 51 and the cavity assembly 52 are respectively provided with two sets of four core assemblies 61, the two first cavities 51 are located at the left side, the two cavity assemblies 52 are located at the right side, the two first cavities 51 and the two third cavities 521 are symmetrically arranged in the center, the four core assemblies 61 are symmetrically arranged in the center, that is, after the movable mold 6 rotates 180 degrees, the rotated core assemblies 61 can still be smoothly matched with the first cavities 51 and the cavity assemblies 52 to produce products; correspondingly, the runner plate 4 is provided with two first runners 41 and two second runners 42, the fixed mold 5 is provided with two first glue inlet runners 53 and two second glue inlet runners 54, the first glue inlet runners 53 on the left side are communicated with one first runner 41 and one first cavity 51, and the second glue inlet runners 54 on the right side are communicated with one second runner 42 and one second cavity 522; this embodiment allows two products to be injection molded at a time.

In this embodiment, the stripper plate 7 is an ejector plate, the stripper plate 7 is provided with an inclined top 71 for demolding, and specific structures of the rotating mechanism, the lifting mechanism, the inclined top 71 and the steam mold temperature machine are in the prior art and are not described herein; the first cavity 51, the cavity assembly 52 and the core assemblies 61 are all of an insert structure, and each core assembly 61 is provided with an insert 9.

As shown in fig. 4, a sliding block 10 and a shovel 11 are arranged on the movable mold 6, an inclined guide post 12 is arranged on the fixed mold 5, the sliding block 10 is slidably arranged beside each core assembly 61, the mask body 1 comprises a pointed arc surface 19, a forming surface 102 which is matched with the arc surface 19 is arranged on the sliding block 10, the forming surface 102 is positioned beside the core assemblies 61 and forms a complete core with the core assemblies 61, the shovel 11 presses the sliding block 10, a first inclined through hole 101 is arranged on the sliding block 10, a second inclined through hole 111 coaxial with the first inclined through hole 101 is arranged on the shovel 11, and the inclined guide posts 12 are sequentially inserted into the second inclined through hole 111 and the first inclined through hole 101 during mold closing.

Because the light guide strip 2 needs a higher polished mirror surface, and the mask body 1 and the light guide strip 2 are both irregularly curved surfaces, the first cavity 51, the cavity assembly 52 and the core assembly 61 are all made of 1.2343ESR steel; the first cavity 51 and the first core 611 are rough, heat treated, destressed, semi-finished, and the second cavity 522 and the second core 612 are rough, heat treated, destressed, semi-finished, and superfinished; the heat treatment process enables the hardness of the first cavity 51 and the second cavity 522 to reach HRC52-54, so that a better polishing effect is achieved; since the light guide bar 2 has the light guide characteristic and the characteristic structure is a triangle structure, when the second core 612 is machined, a high-rotation-speed five-axis machine tool with a rotation speed of more than forty thousand turns is adopted for finish machining.

Embodiment four:

the embodiment discloses an injection molding method of an automobile rearview mirror mask in the first or second embodiment, which adopts an injection mold in the third embodiment and comprises the following steps:

s1, fixing an upper code template 3 and a lower code template 8 in an injection molding machine;

s2, preparing the material of the mask body 1 and the material of the light guide strip 2 after drying by a dehumidifying dryer, wherein the moisture weight ratio of the material of the mask body 1 to the material of the light guide strip 2 after drying is lower than 0.025%;

s3, placing the material of the mask body 1 into a first injection hopper of an injection molding machine, and placing the material of the light guide strip 2 into a second injection hopper of the injection molding machine;

s4, the fixed die 5 and the movable die 6 are clamped, the temperature of the melt adhesive is controlled to be 260 ℃, the adhesive injection pressure is controlled to be 90MPA, and materials of the mask body 1 are sequentially injected into the first cavity 51 from an injection hopper through the first flow channel 41 and the first adhesive inlet flow channel 53 to form the mask body 1 with the bulges 16;

s5, cooling for 25 seconds after injection molding;

s6, after cooling, the lifting mechanism drives the movable die 6 to descend for die opening, the rotating mechanism drives the movable die 6 to rotate 180 degrees, the lifting mechanism drives the movable die 6 to ascend and the fixed die 5 to be matched with the die again, and the mask body 1 is moved into the third cavity 521;

s7, injecting 100 ℃ water vapor into the water inlet channel 18 from a steam mold temperature machine, simultaneously injecting materials of the light guide strips 2 into the second cavity 522 from the two injection hoppers through the second runner 42 and the second glue inlet runner 54 in sequence to form the light guide strips 2 with the splicing parts 15, bonding the first splicing surfaces 13 and the second splicing surfaces 14 together, bonding the splicing parts 15 and the mask body 1 together, and bonding the peripheral wall of each protrusion 16 and the inner peripheral wall of the corresponding bonding hole 17 together;

s8, the lifting mechanism drives the movable mould 6 to descend for mould opening, the demoulding plate 7 moves to demould the product, and finally, the product is taken by hands or manipulators.

Fifth embodiment:

the difference between this example and the fourth example is that the sol temperature in step S4 is 270 degrees celsius, the ejection pressure is 100MPA, the cooling time in step S5 is 30 seconds, and the water vapor temperature in step S7 is 120 ℃.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above five embodiments, and all other examples obtained by those skilled in the art without making any inventive effort are within the scope of the present invention.

Claims

1. An injection mold for producing a rearview mirror mask of an automobile is characterized by comprising an upper stacking template (3), a runner plate (4), a fixed mold (5), a movable mold (6), a demolding plate (7) and a lower stacking template (8) which are sequentially arranged from top to bottom, wherein a first cavity (51) and a cavity assembly (52) are arranged in the fixed mold (5), the cavity assembly (52) comprises a third cavity (521) and a second cavity (522), a rotating mechanism for driving the movable mold (6) to rotate and a lifting mechanism for driving the movable mold (6) to lift are arranged on the movable mold (6), two core assemblies (61) are arranged in the movable mold (6), and the two core assemblies (61) are respectively positioned below the first cavity (51) and the cavity assembly (52), and each core assembly (61) comprises a first core (611) and a second core (612); when the mold is closed, a first mold cavity for producing the mask body (1) with the bulge (16) is formed between the first mold cavity (51) and the first mold core (611) positioned below the first mold cavity, a second mold cavity for producing the light guide strip (2) with the splicing part (15) is formed between the second mold cavity (522) and the second mold core (612) positioned below the second mold cavity, and a third mold cavity for placing the mask body (1) with the bulge (16) is formed between the third mold cavity (521) and the first mold core (611) positioned below the third mold cavity; a water channel (18) is further arranged on the fixed die (5), the water channel (18) is positioned above a die cavity for producing the splicing part (15) in the second die cavity (522), and the water channel (18) is externally connected with a steam die temperature machine; be equipped with first runner (41) and second runner (42) on runner board (4), be equipped with first runner (53) and second runner (54) that advance on cover half (5), first runner (53) intercommunication first runner (41) with first die cavity (51), second runner (54) intercommunication second runner (42) with second die cavity (522).

2. The injection mold of claim 1, wherein the first cavity (51), the cavity assembly (52) and the core assembly (61) each employ a mosaic structure.

3. Injection mold according to claim 1, wherein each core assembly (61) is provided with an insert (9).

4. The injection mold according to claim 1, characterized in that a sliding block (10) and a shovel (11) are arranged on the movable mold (6), an inclined guide post (12) is arranged on the fixed mold (5), the sliding block (10) is slidably arranged beside the mold core assembly (61), a tip-shaped circular arc surface (19) is arranged on the mask body (1), a molding surface (102) matching the shape of the circular arc surface (19) is arranged on the sliding block (10), the molding surface (102) is arranged beside the mold core assembly (61) and forms a complete mold core with the mold core assembly (61), the shovel (11) presses the sliding block (10), a first inclined through hole (101) is arranged on the sliding block (10), a second inclined through hole (111) concentric with the first inclined through hole (101) is arranged on the shovel (11), and the inclined guide post (12) is sequentially inserted into the second inclined through hole (111) and the first inclined through hole (101) during mold closing.

5. Injection mold according to claim 1, characterized in that the stripper plate (7) is a thimble plate, and that the stripper plate (7) is provided with a beveled roof (71).

6. An injection molding method of an automobile rearview mirror mask, characterized in that the injection mold according to any one of claims 1 to 5 is used, comprising the steps of:

s1, fixing an upper code template (3) and a lower code template (8) in an injection molding machine;

s2, preparing materials of the mask body (1) and materials of the light guide strips (2) after drying by a dehumidifying dryer;

s3, placing the material of the mask body (1) into a first injection hopper of an injection molding machine, and placing the material of the light guide strip (2) into a second injection hopper of the injection molding machine;

s4, the fixed die (5) and the movable die (6) are clamped, the temperature of the melt adhesive is controlled to be 260-270 ℃, the injection pressure is controlled to be 90-100 MPA, and materials of the mask body (1) are injected into the first cavity (51) from an injection hopper sequentially through the first flow channel (41) and the first glue inlet flow channel (53) to form the mask body (1) with the bulges (16);

s5, cooling for 25 to 30 seconds after injection molding;

s6, after cooling, the lifting mechanism drives the movable die (6) to descend for die opening, the rotating mechanism drives the movable die (6) to rotate 180 degrees, the lifting mechanism drives the movable die (6) to ascend and the fixed die (5) to be matched with the die again, and the mask body (1) is moved into the third cavity (521);

s7, injecting water vapor at 100-120 ℃ into a water inlet channel (18) from a steam mould temperature machine, simultaneously injecting materials of the light guide strip (2) from a two-shot hopper into a second cavity (522) sequentially through a second flow channel (42) and a second glue inlet flow channel (54) to form the light guide strip (2) with a splicing part (15), bonding the first splicing surface (13) with the second splicing surface (14), bonding the splicing part (15) with the mask body (1), and bonding the peripheral wall of each protrusion (16) with the inner peripheral wall of a corresponding bonding hole (17);

s8, the lifting mechanism drives the movable mould (6) to descend for mould opening, the demoulding plate (7) moves to demould the product, and finally, the part is taken by hand or a mechanical arm.

7. The injection molding method of the automobile rearview mirror mask according to claim 6, wherein the moisture weight ratio of the material of the mask body (1) and the material of the light guide strip (2) in the step S2 after drying is lower than 0.025%.