Forming mold, grating mask forming method and grating mask

Abstract

The invention discloses a forming mold, a grating mask forming method and a grating mask. The technical problem that in the prior art, glue overflows during injection molding of a grating mask is solved. The forming mold comprises a first half mold provided with a first molded surface and a primary glue injection port, and the edge of the first molded surface protrudes relative to the middle part to form an annular protrusion; the second half mold is provided with a second molded surface, and the second half mold is movably arranged so as to be switched between a first position and a second position; the third half mold is provided with a third molded surface and a secondary glue injection port; under the condition that the second half mold is located at the first position, the second half mold and the first half mold define a primary cavity matched with the body with the annular concave part, and the primary glue injection port is communicated with the primary cavity; and under the condition that the second half mold is located at the second position, the second half mold and the body define a secondary cavity matched with the covering layer, and the secondary glue injection opening communicates with the secondary cavity. According to the forming mold, the deformation amount of the body in the injection molding process is reduced, and the problem of glue overflowing is avoided.

Description

Technical Field

[0001] The present application belongs to the technical field of vehicle grille panel molding, and specifically relates to a molding die, a grille mask molding method, and a grille mask. Background Art

[0002] The grille mask is installed at the front end of the cab, and has a light-transmitting part and a light-shielding part. The light-transmitting part allows light to be transmitted, and the light-shielding part can be used as a shielding structure, such as a shielding anti-shrinkage structure or a rubber-ribbed structure.

[0003] In the prior art, grille masks are mostly obtained by injection molding. However, since the length of the grille mask is about 1188 mm, which is very large, and the edge position is a curved surface, glue overflow is very likely to occur during the injection molding process. Summary of the invention

[0004] In order to solve the current technical problem of glue overflow in the molding of large-sized curved grille masks, the present application provides a molding die, a grille mask molding method and a grille mask.

[0005] In a first aspect of the present application, a molding die is provided for molding a curved grille mask, the grille mask comprising a body and an annular covering layer connected to the side edges of the body, both sides of the body along the width direction of the vehicle body are curved surfaces, and the molding die comprises:

[0006] The first half mold is provided with a first molding surface and a primary glue injection port, wherein the edge of the first molding surface protrudes relative to the middle portion to form an annular convexity, and the annular convexity corresponds to the position of the glue coating rib;

[0007] A second mold half is provided with a second molding surface, and the second mold half is movably arranged to switch between a first position and a second position;

[0008] The third half mold is provided with a third molding surface and a secondary injection port;

[0009] Wherein, when the second half mold is located in the first position, the second half mold is molded together with the first half mold, so that the first molding surface and the second molding surface are combined to form a primary molding cavity matching the main body with the annular recess, and the primary injection port is connected to the primary molding cavity; when the second half mold is located in the second position, the second half mold is molded together with the main body, and the main body and the third molding surface are combined to form a secondary molding cavity matching the covering layer, and the secondary injection port is connected to the secondary molding cavity.

[0010] In some embodiments, the height of the annular protrusion is 1.2-1.8 mm, and the distance between the top of the annular protrusion and the second profile surface is 1.6-3 mm.

[0011] In some embodiments, the width of the annular bulge is 10 to 14 mm.

[0012] In some embodiments, a rubber rib is provided on the annular covering layer, and the distance between the third profile and the annular recess is (2.7-3)×d, where d represents the thickness of the rubber rib; the distance between the third profile and the main body is 4-4.2 mm.

[0013] In some embodiments, the body is bent on both sides along the width direction of the vehicle in a direction away from the center of curvature of the curved surface, the third half mold overlaps with the end surface of the bent portion of the body, and along the width direction of the vehicle, the overlap size of the third half mold and the end surface of the body is ≥3mm.

[0014] In some embodiments, the outer edge of the annular covering layer extends out of the main body, and the outer edge of the annular covering layer extends in a direction away from the center of curvature of the curved surface, the third half mold includes a mold core and a slider, the mold core is provided with a first sub-mold surface and a second sub-mold surface, the first sub-mold surface and the second sub-mold surface are arranged at an acute angle, the slider is provided with a third sub-mold surface corresponding to the position of the second sub-mold surface, the middle part of the third sub-mold surface is protruding, and the edge of the main body, the first sub-mold surface, the second sub-mold surface and the third sub-mold surface together enclose the secondary mold cavity.

[0015] In a second aspect of the present application, a grille mask forming method is provided, which is applicable to the forming mold of the first aspect, and is characterized in that the grille mask manufacturing method comprises the following steps:

[0016] The first half mold and the second half mold are combined to form a primary cavity, and a light-transmitting material is injected into the primary cavity through a primary injection port to obtain a body;

[0017] The first half mold is removed, and the second half mold drives the main body to switch from the first position to the second position, so that the second half mold and the main body are combined to form a secondary cavity, and opaque material is injected into the secondary cavity through the secondary injection port to obtain the grille mask.

[0018] In some embodiments, in the one-time injection molding, the injection pressure is 140-155 MPa, the injection rate is 30-40 mm / s, and the temperature of the first half mold and the second half mold is 95-105° C.

[0019] In some embodiments, in the secondary injection molding, the injection pressure is 130-140 MPa, the injection rate is 30-40 mm / s, the temperature of the second half mold and the third half mold is 95-105° C., the holding pressure is 6.5-7.5 MPa, and the holding time is 3-7 s.

[0020] In a third aspect of the present application, there is provided a grille mask formed by the molding die of the first aspect, or formed by the grille mask molding method of the second aspect.

[0021] According to the molding mold provided by the embodiment of the present application, it includes three half molds, namely the first half mold, the second half mold and the third half mold, wherein the first half mold is provided with a first profile and a primary glue injection port, the edge of the first profile is protruding relative to the middle part to form an annular convexity, and the annular convexity corresponds to the position of the glue coating rib; the second half mold is provided with a second profile, and the second half mold is movably arranged to switch between the first position and the second position; the third half mold is provided with a third profile and a secondary glue injection port. Wherein, when the second half mold is located at the first position, the second half mold is molded with the first half mold so that the first profile and the second profile are combined to form a primary mold cavity matching the body with the annular concave, and the primary glue injection port is connected to the primary mold cavity; when the second half mold is located at the second position, the second half mold is molded with the body, and the body and the third profile are combined to form a secondary mold cavity matching the covering layer, and the secondary glue injection port is connected to the secondary mold cavity.

[0022] When the second half mold is located in the first position, the second half mold is combined with the first half mold, so that the first molding surface and the second molding surface are combined to form a primary molding cavity matching the main body with the annular concave, and the primary injection port is connected to the primary molding cavity, so that the light-transmitting material can be injected into the primary molding cavity through the primary injection port to form a main body with the annular concave. When the second half mold is located in the second position, the second half mold is combined with the main body, and the main body and the third molding surface are combined to form a secondary molding cavity matching the covering layer, and the secondary injection port is connected to the secondary molding cavity, so that the light-opaque material, i.e., the shading material, can be injected into the secondary molding cavity through the secondary injection port to form an annular shading layer, thereby completing the injection molding of the grille mask.

[0023] Since the thickness of the middle part of the grille mask formed by the molding mold of the present application is the same as the thickness of the finished light-emitting grille, and the thickness at the edge part is thinner than that at the middle part, less light-transmitting material flows into the edge part during one injection molding process, and the edge part is close to the curved surfaces on both sides of the body. This can reduce the stress concentration at the curved surfaces on both sides of the body, thereby reducing the risk of deformation of the body at the curved surfaces on both sides, thereby reducing the risk of glue overflow during the secondary injection process.

[0024] Even if there is a certain internal stress in the body and deformation occurs after the main body injection molding is completed, since the thickness of the body is relatively thin at the edge, the body can be easily corrected to the target shape under the action of the third half mold. The thicker annular covering layer can also offset part of the deformation of the thinner body, so that the molded grille mask is close to the target size.

[0025] In addition, the thinning of the edge of the main body means that the thickness of the annular covering layer at the curved surfaces on both sides will increase, and the rubber ribs correspond to the position of the annular convexity, that is, the annular covering layer is thickened at the position of the rubber ribs, which can improve the connection strength between the annular covering layer and the rubber ribs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a grille mask in one or more embodiments of the present application is shown.

[0027] Figure 2 A schematic structural diagram of a main body of a grille mask and an annular covering layer in one or more embodiments of the present application is shown.

[0028] Figure 3 A schematic diagram of the structure of a molding die in one or more embodiments of the present application is shown.

[0029] Figure 4 Shows Figure 3 Schematic diagram of the structure of the primary cavity of the molding mold.

[0030] Figure 5 Shows Figure 3 Schematic diagram of the structure of the secondary cavity of the molding mold.

[0031] Figure 6 Shows Figure 3 A partial enlarged view of point A in the middle.

[0032] Figure 7 Shows Figure 3 A partial enlarged view of point B in the middle.

[0033] Description of reference numerals:

[0034] 10-first half mold, 11-primary glue injection port, 12-annular convexity, 13-first molding surface, 14-half mold body, 15-pressing block.

[0035] 20-second half mold, 21-second molding surface. 30-third half mold, 31-secondary injection port, 32-third molding surface, 33-mold core, 331-first sub-molding surface, 332-second sub-molding surface, 34-slider, 341-third sub-molding surface, 342-protrusion.

[0036] 60-primary cavity, 70-secondary cavity;

[0037] 80 - grid mask, 81 - main body, 811 - annular recess, 82 - annular covering layer, 83 - first curved surface, 84 - second curved surface. DETAILED DESCRIPTION

[0038] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0039] The first embodiment of the present application provides a molding die, which is used to mold a large-sized curved grille mask 80, which can reduce the deformation risk of the grille mask 80 during the molding process and reduce the amount of glue overflow.

[0040] See also Figure 1 as well as Figure 2 The curved grille mask 80 is an axisymmetric structure, and both sides along its own length direction, that is, the width direction of the vehicle body, are curved surfaces, and the center of curvature of the curved surface is close to the outside of the vehicle. The middle part of the grille mask 80 is also a curved surface, and the center of curvature of the middle curved surface is close to the inside of the vehicle. In other words, the centers of curvature of the middle curved surface and the two side curved surfaces are respectively located on both sides of the grille mask 80, and appear to be W-shaped when viewed from top to bottom, thus forming a multi-curved large-size grille mask 80 with a middle curved surface and two side curved surfaces. For ease of explanation, the middle curved surface can be named as the first curved surface 83, and the two side curved surfaces can be named as the second curved surface 84, wherein the curvature of the two side curved surfaces, that is, the second curved surface 84, is 0.013 to 0.035.

[0041] See also Figure 1 as well as Figure 2 The grille mask 80 includes a body 81 and an annular covering layer 82. The annular covering layer 82 covers the side edge of the body 81 close to the inside of the vehicle, that is, close to the center of curvature of the first curved surface 83. The annular covering layer 82 can be made of opaque material to cover the internal structures such as the anti-shrinkage structure (doghouse) and the rubber-coated ribs. The body 81 can be made of translucent material to achieve the light-transmitting function, so that the light-emitting grille assembly can present the lighting effects in scenes such as welcoming guests and seeing off guests.

[0042] The main body 81 is bent on both sides along the width direction of the vehicle body in a direction away from the center of curvature of the second curved surface 84, that is, it is bent toward the inside of the vehicle. The edge of the annular covering layer 82 extends out of the main body 81, and the part of the annular covering layer 82 extending out of the main body 81 extends in a direction away from the center of curvature of the curved surfaces on both sides, forming a connection structure that cooperates with the grille mounting structure.

[0043] See also Figure 3 , Figure 4 as well as Figure 5The molding mold provided in the present application includes three half molds, namely a first half mold 10, a second half mold 20 and a third half mold 30, wherein the first half mold 10 is provided with a first molding surface 13 and a primary glue injection port 11, the edge of the first molding surface 13 protrudes relative to the middle part to form an annular bulge 12, and the annular bulge 12 corresponds to the position of the glue coating rib; the second half mold 20 is provided with a second molding surface 21, and the second half mold 20 is movably arranged to switch between the first position and the second position; the third half mold 30 is provided with a third molding surface 32 and a secondary glue injection port 31.

[0044] In which, when the second half mold 20 is located at the first position, the second half mold 20 is molded with the first half mold 10 so that the first mold surface 13 and the second mold surface 21 are combined to form a primary mold cavity 60 matching the body 81 with the annular concave 811, and the primary injection port 11 is connected to the primary mold cavity 60, so that the light-transmitting material can be injected into the primary mold cavity 60 through the primary injection port 11 to form a body 81 with the annular concave 811, that is, the thickness of the middle position of the body 81 is the same as the thickness of the finished light-emitting grille, and the thickness of the edge position is thinner than that of the middle position, so that in the process of primary injection molding, the light-transmitting material flowing into the edge position is There is less light-transmitting material, and the edge position is close to the two side curved surfaces of the body 81, which can reduce the stress concentration at the two side curved surfaces of the body 81, thereby reducing the deformation risk of the body 81 at the two side curved surfaces, thereby reducing the risk of glue overflow during the secondary glue injection process; even if there is a certain internal stress in the body 81 after the injection molding of the body 81, the body 81 is easily corrected to the target shape under the action of the third half mold 30 because the thickness of the body 81 at the edge is relatively thin, and the thicker annular covering layer 82 can also offset the partial deformation of the thinner body 81, so that the grille mask 80 after molding is close to the target size. In addition, the thinning of the edge position of the body 81 means that the thickness of the annular covering layer 82 at the two side curved surfaces will increase, and the glue ribs correspond to the position of the annular convex 12, that is, the annular covering layer 82 is thickened at the position of the glue ribs, which can improve the connection strength between the annular covering layer 82 and the glue ribs.

[0045] When the second half mold 20 is in the second position, the second half mold 20 is molded together with the main body 81, and the main body 81 and the third mold surface 32 are enclosed to form a secondary cavity 70 that matches the covering layer. The secondary injection port 31 is connected to the secondary cavity 70, so that opaque material, i.e., shading material, can be injected into the secondary cavity 70 through the secondary injection port 31 to form an annular shading layer, thereby completing the injection molding of the grille mask 80.

[0046] In some embodiments, the height of the annular protrusion 12 can be 1.2 to 1.8 mm, that is, the depth of the annular concave 811 of the body 81 formed is 1.2 to 1.8 mm, such as 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm or 1.7 mm, etc. If the height of the annular protrusion 12 is too high, the thickness of the body 81 at the position of the annular concave 811 will be too small to a certain extent, and uneven material filling will occur. If the height of the annular protrusion 12 is too small, the effect of preventing glue overflow will be reduced to a certain extent. In other embodiments, the height of the annular protrusion 12 can also be 1.9 mm or 1.1 mm, which can still reduce the deformation risk of the curved surfaces on both sides, thereby reducing the glue overflow problem.

[0047] In some embodiments, the distance between the top of the annular protrusion 12 and the second profile 21 can be 1.6 to 3 mm, that is, the thickness of the body 81 at the annular recess 811 is 1.6 to 3 mm, for example, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.5 mm, 2.6 mm, 2.8 mm or 2.9 mm, etc., to ensure the filling effect of the material. In other embodiments, the distance between the top of the annular protrusion 12 and the second profile 21 can be 1.5 mm or 3.1 mm.

[0048] In some embodiments, the width dimension of the annular protrusion 12 can be 10-14 mm, that is, the radius difference of the annular protrusion 12 along the radial direction can be 10-14 mm, that is, the width dimension of the annular recess 811 on the body 81 can be 10-14 mm, for example, 11 mm, 12 mm or 13 mm, etc. If the width dimension of the annular protrusion 12 is too large, the material of the body 81 at this location is too small, which may aggravate the deformation of the body 81 at the side curved surface to a certain extent. If the width dimension of the annular protrusion 12 is too small, the effect of suppressing deformation may be reduced. In other embodiments, the width dimension of the annular protrusion 12 can also be 15 mm or 9 mm, which can also achieve a certain effect of suppressing deformation of the curved surfaces on both sides.

[0049] In some embodiments, the distance between the third profile 32 and the annular concave 811 may be (2.7-3)×d, where d represents the thickness of the rubber rib, that is, the thickness of the annular covering layer 82 at the rubber rib in the formed grille mask 80 may be (2.7-3)×d, such as 2.8d or 2.9d, etc., which can ensure the connection strength between the rubber rib and the annular covering layer 82. Of course, in other embodiments, the distance between the third profile 32 and the annular concave 811 may also be 3.2d, which can still ensure the connection strength between the rubber rib and the annular covering layer 82.

[0050] In some embodiments, the distance between the third profile 32 and the body 81 can be 4 to 4.2 mm, that is, the conventional thickness of the annular covering layer 82 can be 4 to 4.2 mm, for example, 4.1 mm, which is less than the thickness of the annular covering layer 82 at the rubber rib. In other embodiments, the distance between the third profile 32 and the body 81, that is, the conventional thickness of the annular covering layer 82 can also be 4.3 mm or 3.9 mm.

[0051] See also Figure 6 The first half mold 10 includes a half mold body 14 and a clamping block 15. The half mold body 14 and the clamping block 15 jointly provide a first mold surface 13. When the first half mold 10 is separated from the second half mold 20, as the second half mold 20 moves away from the first half mold 10, the clamping block 15 moves in a direction away from the half mold body 14, so that the clamping block 15 and the half mold 10 are both detached from the body 81. The structure for separating the clamping block 15 relative to the half mold body 14 during the mold separation process is a prior art. For example, a tilting rod is provided on the second half mold 20, and a guide hole is provided on the clamping block 15. When the second half mold 20 reciprocates along the first direction, the tilting rod can extend into or leave the guide hole, so that the clamping block 15 is close to or away from the half mold body 14. For more information, please refer to the prior art disclosure, which will not be described in detail in this application.

[0052] In some embodiments, the primary glue injection port 11 is located in the central part of the primary cavity 60, and coincides with the center line of the length direction and the center line of the height direction of the grille mask 80 to ensure the consistency of the curved surfaces on both sides of the body 81, reduce weld lines, and reduce internal stress and deformation of parts. The sealing height H1 of the clamping block 15 at the end of the length direction of the body 81 is ≥2.0mm to ensure that the parts can be effectively compressed and there will be no product crushing problems. The parting crimping width W1 of the clamping block 15 at the end of the length direction of the body 81 is ≥0.9mm to ensure that the body of the grille mask is compressed. There are two clamping blocks 15, and the two clamping blocks 15 are respectively located on both sides of the grille along its own length direction. The two clamping blocks 15 can move away from each other along the parting surface to demold the body 81 and the first half mold 10.

[0053] The second mold half 20 is a movable mold half, which can be switched between the first position and the second position, and the first mold half 10 and the third mold half 30 are fixed molds, and their positions remain unchanged. In a specific implementation, the first mold half 10, the second mold half 20 and the third mold half 30 can be arranged in sequence along the first direction, and the first direction can be a vertical direction or a horizontal direction. The first mold half 10 and the third mold half 30 can be used as fixed molds, and the second mold half 20 is located between the first mold half 10 and the third mold half 30. The second mold half 20 can rotate around itself and can reciprocate along the first direction. In this way, after the first injection molding is completed, the first mold half 10 and the second mold half 20 can be opened by moving away from the first mold half 10 along the first direction. After the mold opening, the body 81 formed by the first injection molding will adhere to the second mold half 20 and move to the second position with the second mold half 20. The second mold half 20 can rotate 180° around itself with the body 81, so that the body 81 faces the third mold half 30, and then approaches the third mold half 30 along the first direction until reaching the second position, thereby realizing the mold closing of the body 81 and the third mold half 30. The second mold half 20 moves away from the third mold half 30 along the first direction to realize the mold opening of the second mold half 20 and the third mold half 30. The reciprocating movement and rotation of the second mold half 20 can be realized by a driving mechanism, which can include a hydraulic cylinder and a motor. The driving mechanism is a prior art, and more details thereof can be referred to the prior art disclosure, and will not be described in detail in this application. In some embodiments, the third half mold 30 can move back and forth along the first direction to approach or move away from the second half mold 20. The second half mold 20 is provided with two second molding surfaces 21 arranged opposite to each other along the first direction. One of the second molding surfaces 21 of the second half mold 20 can be combined with the first half mold 10 to form a primary cavity 60, and the other second molding surface 21 with the body 81 and the third half mold 30 can be combined to form a secondary cavity 70. The primary injection molding and the secondary injection molding are carried out simultaneously to improve the molding efficiency.

[0054] See also Figure 7 The third half mold 30 includes a mold core 33 and a slider 34. The mold core 33 is provided with a first sub-mold 331 and a second sub-mold 332. The first sub-mold 331 and the second sub-mold 332 are arranged at an acute angle. The slider 34 is provided with a third sub-mold 341 corresponding to the position of the second sub-mold 332. The middle part of the third sub-mold 341 protrudes to form a protrusion 342. The edge of the body 81, the first sub-mold 331, the second sub-mold 332 and the third sub-mold 341 together form a secondary mold cavity 70. That is to say, the secondary mold cavity 70 forms a depression at a position corresponding to the protrusion in the middle part of the third sub-mold 341. In this way, the part of the annular covering layer 82 formed by injection molding that extends out of the body 81 will form a groove, which can increase the contact area between the third sub-mold 341 and the annular covering layer 82 and prevent the annular covering layer 82 from breaking. At the same time, the groove of the annular covering layer 82 can also be a carded connection structure.

[0055] During the demolding process of the second mold half 20 and the third mold half 30, the third mold half 30 moves in a direction away from the second mold half 20, and the slider 34 moves sideways away from the mold core 33 to realize demolding of the grille mask 80. Regarding the implementation structure of the slider 34 approaching or moving away from the mold core 33, the slider 34 is also provided with a guide hole, and the tilting rod of the second mold half 20 can extend into or leave the guide hole of the slider 34, so as to realize the slider 34 approaching or moving away from the mold core 33. This part of the content is the prior art, and more content can be referred to the prior art disclosure, and this application will not repeat it.

[0056] In some embodiments, please refer to Figure 7 , the end faces of the third half mold 30 and the bent part of the body 81 overlap, and along the width direction of the vehicle, the overlap dimension w2 of the end faces of the third half mold 30 and the body 81 is ≥3mm, that is, the overlap dimension w2 of the end faces of the slider 34 and the body 81, which can also be called the sealing width w2 ≥3mm, such as 4mm, 5mm or 6mm, etc., so that the third half mold 30 can apply pressure to the body 81 toward the outside of the vehicle, increase the effective area with the end face of the body 81, and prevent the body 81 from being crushed. In other embodiments, the overlap dimension of the end faces of the third half mold 30 and the body 81 can also be 2mm. The sealing height H2 of the slider 34 is ≥2mm, such as 3mm, 4mm or 5mm, etc.

[0057] In some embodiments, see Figure 5 There are multiple secondary injection ports 31, and the multiple secondary injection ports 31 are spaced apart at the edge of the body 81, that is, the multiple secondary injection ports 31 are spaced apart along the circumference of the annular secondary cavity 70 to improve the uniformity of each position of the annular covering layer 82 and improve the injection efficiency at the same time.

[0058] The second embodiment of the present application provides a method for manufacturing a grille mask 80, which is applicable to the molding mold of any embodiment of the first aspect.

[0059] The method for manufacturing the grille mask 80 of the present application comprises the following steps:

[0060] S1, the first half mold 10 and the second half mold 20 are combined to form a primary cavity 60, and a light-transmitting material is injected into the primary cavity 60 through the primary injection port 11 to obtain a body 81;

[0061] S2. Remove the first half mold 10, and the second half mold 20 drives the main body 81 to switch from the first position to the second position, so that the second half mold 20 and the main body 81 enclose the secondary cavity 70, and inject opaque material into the secondary cavity 70 through the secondary injection port 31 to obtain the grille mask 80.

[0062] The grille mask 80 is obtained by injection molding twice, the first injection molding is for the light-transmitting body 81, and the second injection molding is for the opaque annular covering layer 82. Separate injection molding can meet the injection molding requirements of two-color, i.e., transparent material and opaque material, on the one hand, and can reduce the internal stress of the grille mask 80 and the deformation of the grille mask 80 on the other hand. However, for a grille mask 80 with a large size and multiple curved surfaces, the injection molding process is very easy to deform at the curved surfaces on both sides. By controlling the primary cavity 60 to have a smaller thickness dimension at the curved surfaces on both sides, the feed amount can be reduced, thereby reducing stress concentration and reducing the deformation of the body 81; at the same time, it can also be corrected under the action of the thicker annular covering layer 82, so that the grille mask 80 is close to the target size, and the manufacturing accuracy of the grille mask 80 is improved.

[0063] In some embodiments, in the one-time injection molding, the injection pressure is 140-155 MPa, such as 141 MPa, 143 MPa, 145 MPa, 148 MPa, 150 MPa, 152 MPa, 153 MPa or 154 MPa. The injection rate is 30-40 mm / s, such as 31 mm / s, 33 mm / s, 35 mm / s, 36 mm / s, 37 mm / s, 38 mm / s or 39 mm / s. The temperature of the first half mold 10 and the second half mold 20 is 95-105° C., such as 96° C., 97° C., 98° C., 99° C., 100° C., 101° C., 102° C., 103° C. or 104° C.

[0064] In addition, the baking temperature of the transparent material is 290-300° C., such as 293° C., 295° C. or 298° C., etc., and after baking, it is injected into the primary cavity 60 .

[0065] In some embodiments, in the secondary injection molding, the injection pressure is 13-14 MPa, for example, 13.5 MPa, 13.7 MPa, 13.8 MPa or 13.9 MPa, and the injection rate is 30-40 mm / s, for example, 31 mm / s, 33 mm / s, 35 mm / s, 36 mm / s, 37 mm / s, 38 mm / s or 39 mm / s. The temperature of the second half mold 20 and the third half mold 30 is 95-105° C., for example, 96° C., 97° C., 98° C., 99° C., 100° C., 101° C., 102° C., 103° C. or 104° C., the holding pressure is 6.5-7.5 MPa, for example, 6.6 MPa, 6.7 MPa, 6.8 MPa, 6.9 MPa, 7.0 MPa, 7.1 MPa, 7.2 MPa, 7.3 MPa or 7.4 MPa, and the holding time is 3-7 s, for example, 4 s, 5 s or 6 s.

[0066] A third aspect of the present application provides a grille mask 80, which is obtained by molding using the molding mold of any embodiment of the first aspect, or by molding using the molding method of the grille mask 80 of the second aspect.

[0067] The grille mask 80 also includes a coating, a laser engraved pattern and a protective layer, wherein the coating covers the side of the grille mask 80 close to the outside of the vehicle, the laser engraved pattern and the protective layer sequentially cover the body 81 of the grille mask 80 and are located in the annular covering layer 82.

[0068] The coating may be a hardened coating, or the coating may include a transparent primer layer, a vehicle body color paint layer and a protective layer arranged in sequence from the main body 81 to the outside, wherein the transparent primer layer may increase the adhesion of the paint, and the protective layer may increase the weather resistance and mechanical wear resistance of the parts.

[0069] The laser engraving pattern can be formed by first spraying a covering primer onto the portion of the body 81 located within the annular covering layer 82, and then processing a light-transmitting area to form a laser engraving pattern.

[0070] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0071] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0072] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0073] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0074] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A molding die for molding a curved grille mask, characterized in that: The grille mask comprises a body and an annular covering layer connected to the side edges of the body, both sides of the body along the width direction of the vehicle body are curved surfaces, and the molding die comprises: The first half mold is provided with a first molding surface and a primary glue injection port, wherein the edge of the first molding surface protrudes relative to the middle portion to form an annular convexity, and the annular convexity corresponds to the position of the glue coating rib; A second mold half is provided with a second molding surface, and the second mold half is movably arranged to switch between a first position and a second position; The third half mold is provided with a third molding surface and a secondary injection port; Wherein, when the second half mold is located in the first position, the second half mold is molded together with the first half mold, so that the first molding surface and the second molding surface are combined to form a primary molding cavity matching the main body with the annular recess, and the primary injection port is connected to the primary molding cavity; when the second half mold is located in the second position, the second half mold is molded together with the main body, and the main body and the third molding surface are combined to form a secondary molding cavity matching the covering layer, and the secondary injection port is connected to the secondary molding cavity.

2. The molding die according to claim 1, characterized in that: The height of the annular convexity is 1.2-1.8 mm, and the distance between the top of the annular convexity and the second profile surface is 1.6-3 mm.

3. The molding die according to claim 1, characterized in that: The width of the annular bulge is 10 to 14 mm.

4. The molding die according to claim 1, characterized in that: The annular covering layer is provided with a rubber rib, and the distance between the third profile and the annular recess is (2.7-3)×d, wherein d represents the thickness of the rubber rib; the distance between the third profile and the main body is 4-4.2 mm.

5. The grille mask forming mold according to any one of claims 1 to 4, characterized in that: The body is bent at both sides along the width direction of the vehicle in a direction away from the center of curvature of the curved surface, the third half mold overlaps with the end surface of the bent portion of the body, and along the width direction of the vehicle, the overlap dimension of the third half mold and the end surface of the body is ≥3mm.

6. The grille mask forming mold according to any one of claims 1 to 4, characterized in that: The outer edge of the annular covering layer extends out of the main body, and the outer edge of the annular covering layer extends in a direction away from the center of curvature of the curved surface. The third half mold includes a mold core and a slider. The mold core is provided with a first sub-mold surface and a second sub-mold surface, and the first sub-mold surface and the second sub-mold surface are arranged at an acute angle. The slider is provided with a third sub-mold surface corresponding to the position of the second sub-mold surface, and the middle part of the third sub-mold surface is protruding. The edge of the main body, the first sub-mold surface, the second sub-mold surface and the third sub-mold surface together enclose the secondary mold cavity.

7. A grille mask forming method, applicable to the forming mold according to any one of claims 1 to 6, characterized in that: The grille mask manufacturing method comprises the following steps: The first half mold and the second half mold are combined to form a primary cavity, and a light-transmitting material is injected into the primary cavity through a primary injection port to obtain a body; The first half mold is removed, and the second half mold drives the main body to switch from the first position to the second position, so that the second half mold and the main body are combined to form a secondary cavity, and opaque material is injected into the secondary cavity through the secondary injection port to obtain the grille mask.

8. The grille mask forming method according to claim 7, characterized in that: In the one-time injection molding, the injection pressure is 140-155 MPa, the injection rate is 30-40 mm / s, and the temperature of the first half mold and the second half mold is 95-105° C.

9. The grille mask forming method according to claim 7, characterized in that: In the secondary injection molding, the injection pressure is 130-140 MPa, the injection rate is 30-40 mm / s, the temperature of the second half mold and the third half mold is 95-105° C., the holding pressure is 6.5-7.5 MPa, and the holding time is 3-7 s.

10. A grille mask, characterized in that: It is obtained by molding using the molding die described in any one of claims 1-6, or by molding using the grille mask molding method described in any one of claims 7-9.

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