A processing method for B-pillar cover

Abstract

The present invention relates to a processing method for a B-pillar cover, which includes a metal plate and a cover body, wherein the metal plate is provided with a plurality of reinforcing holes extending therethrough, and one side of the B-pillar cover is formed with a smooth curved surface. The processing method includes: coating at least part of the surface of both sides of the metal plate with an adhesive; snapping the receiving portion of the metal plate into a movable mold device; controlling the movable mold device to close with the fixed mold device; closing the fixed mold column and the movable mold column to clamp the metal plate and suspend the periphery of the metal plate, wherein the reinforcing holes are located within the suspended range. Controlling the injection head device to inject hot melt material into the molding cavity, wherein the movable mold device is provided with an injection flow channel, the injection direction of the injection flow channel being opposite to the smooth curved surface; controlling the cooling mechanism to cool the molding cavity, and then opening the mold to remove the B-pillar cover. The metal plate can be used as a heat dissipation portion to fit the heat-generating portion of the circuit board, thereby achieving efficient heat dissipation of the B-pillar cover.

Description

Technical Field

[0001] The present invention relates to the field of mold forming technology, and in particular to a processing method for a B-pillar cover. Background Art

[0002] Existing B-pillar covers are molded using injection molding, and are entirely made of plastic. For example, the public document CN214985171U provides a structure for assembling a B-pillar cover with an aluminum door frame sheet metal. This document discloses the structure and connection relationship of the B-pillar cover.

[0003] With the advancement of automotive technology, some vehicles now have camera modules, fingerprint modules, or other functional electronic modules installed on their B-pillars. For example, Publication No. CN216034248U provides a smart door unlocking system. Publication No. CN218400725U, for example, provides a connection structure between a vehicle's B-pillar and a camera. The B-pillar cover provides space for mounting a circuit board, and each module is assembled with the B-pillar cover.

[0004] In related technologies, B-pillar covers are mounted on the vehicle frame, requiring minimal installation space and thickness. These covers are injection molded from plastic. However, plastic has poor thermal conductivity, making it difficult to meet the heat dissipation requirements of electronic modules. Furthermore, the B-pillar cover must protect the camera and circuit board from moisture, and its mounting surface on one side must meet sealing requirements, requiring improvement. Summary of the Invention

[0005] In order to overcome the problems existing in the related art, an embodiment of the present invention provides a method for processing a B-pillar cover plate, so as to solve the technical problems of poor heat dissipation and difficulty in achieving good sealing performance of the B-pillar cover plate.

[0006] According to a first aspect of an embodiment of the present invention, a method for processing a B-pillar cover is provided. The B-pillar cover includes a metal plate formed by bending a thin plate and a cover body extending from the metal plate to both ends. The metal plate is provided with a plurality of reinforcing holes extending therethrough. One side surface of the B-pillar cover is formed with a smooth curved surface. The processing method includes:

[0007] applying adhesive to at least a portion of the surface of both sides of the metal sheet;

[0008] Snap the receiving portion of the metal sheet into engagement with the movable mold device;

[0009] Controlling the movable mold device and the fixed mold device to close, the fixed mold device being provided with a plurality of fixed mold columns, and the movable mold device being provided with a plurality of movable mold columns; the fixed mold columns and the movable mold columns being closed together to clamp the metal plate and to lift the periphery of the metal plate, and the reinforcement hole being located within the lifting range;

[0010] Controlling the injection head device to inject hot melt material into the molding cavity, wherein the movable mold device is provided with an injection flow channel, and the injection direction of the injection flow channel is opposite to the smooth curved surface;

[0011] The cooling mechanism is controlled to cool the molding cavity, and then the mold is opened to remove the B-pillar cover.

[0012] In one embodiment, coating at least a portion of the surfaces of both sides of the metal plate with an adhesive comprises:

[0013] Cleaning the entire surface of the metal sheet;

[0014] clamped on both sides of the metal plate corresponding to the receiving portion;

[0015] Apply adhesive to the exposed surface of the metal sheet.

[0016] In one embodiment, the method of engaging the receiving portion of the metal sheet with the movable mold device includes:

[0017] Clamping the receiving portion of the metal sheet to the supporting boss of the movable mold device, wherein the movable mold device is provided with a concave forming groove, and the supporting boss partially protrudes from the bottom of the forming groove;

[0018] The positions and postures of the bending edges on opposite sides of the metal sheet toward the fixed mold device are adjusted, wherein a lateral flow channel is provided between the bending edge and the wall surface of the forming cavity.

[0019] In one embodiment, the controlling the movable mold device and the fixed mold device to close together further includes:

[0020] Control the insertion of forming bosses into the area between the bend edges and push the metal sheet to the center;

[0021] Among them, the fixed mold device includes a forming boss, a partially concave forming groove and a plurality of positioning ribs distributed on both sides of the forming groove. The forming boss is inserted into the forming groove, the supporting boss is inserted into the forming groove, and the positioning ribs are respectively inserted between the two bent edges and push the metal sheet to slide along the supporting boss.

[0022] In one embodiment, a hollow space is provided between the bottom of the forming groove and the surface of the receiving portion.

[0023] In one embodiment, the movable mold device includes a movable mold core and two horn inserts located on one side of the molding groove, the horn inserts are provided with horn glue injection channels, the metal plate is located between the two horn inserts, and the movable mold core is provided with a main channel and branch channels respectively connected to the horn inserts;

[0024] The movable mold core is provided with a main exhaust groove and a side exhaust groove surrounding the molding cavity. The main exhaust groove and the side exhaust groove are connected to the molding cavity through a plurality of branch grooves. The main exhaust groove and the main channel are arranged opposite to each other.

[0025] In one embodiment, the forming cavity includes a first space and a second space located on both sides of the metal sheet, the volume of the first space is less than or equal to one half of the second space, one of the horn inserts is located in the intersection area of ​​the first space and the metal sheet; the other horn insert is located in the middle area of ​​the second space.

[0026] In one embodiment, the movable mold device and the fixed mold device are provided with two molding cavities, and the two molding cavities are arranged in a clockwise complementary manner. The fixed mold device is provided with an upper cooling channel, and the movable mold device is provided with a lower cooling channel. The return channel of the lower cooling channel is the same as the return channel of the upper cooling channel. In the projection direction on the mold closing surface, the projection of the upper cooling channel coincides with the projection of the lower cooling channel, and the two molding cavities are at least partially within the projection range.

[0027] In one embodiment, the metal sheet includes a first wall, a second wall, a third wall, a fourth wall and a fifth wall that are continuously bent, and the second wall, the third wall and the fourth wall form a concave accommodating portion; the first wall is bent on both sides to form two groups of first bent edges with an unfolding angle, and the third wall is bent on both sides to form two groups of second bent edges with an unfolding angle, the first bent edge and the second bent edge are away from the opening direction of the accommodating portion and have a height difference, and the reinforcement holes are distributed on the first bent edge and the second bent edge, the first wall and the fifth wall.

[0028] In one embodiment, the third wall is provided with a plurality of reinforcement holes, and the metal plate is punched from an aluminum alloy plate having a thickness of 0.1 mm to 0.5 mm.

[0029] The technical solution provided by the embodiments of the present invention may include the following beneficial effects: the metal sheet and the cover body are integrally formed, the cover body covers the edge of the metal sheet, the joint between the cover body and the metal sheet is airtight and has high connection strength, and the metal sheet can be bonded to the heating part of the circuit board as a heat dissipation part, thereby achieving efficient heat dissipation of the B-pillar cover. The smooth curved surface serves as the assembly and bonding sealing surface of the B-pillar cover, thereby achieving a sealed assembly connection of the B-pillar cover. The metal sheet and the cover body are integrally formed, which greatly improves the heat dissipation and assembly sealing of the B-pillar cover. The adhesive can further enhance the tightness of the bonding between the metal sheet and the cover body. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0031] Figure 1 The present invention is a flowchart illustrating a method for manufacturing a B-pillar cover according to an embodiment.

[0032] Figure 2 The present invention is a schematic structural diagram showing the mold closing between a movable mold assembly and a fixed mold assembly according to one embodiment.

[0033] Figure 3 The present invention is a schematic structural diagram showing the mold opening of a movable mold device and a fixed mold device according to an embodiment.

[0034] Figure 4 FIG1 is an enlarged schematic diagram showing a mold closing position of a metal sheet according to an embodiment.

[0035] Figure 5 FIG1 is a schematic structural diagram showing a B-pillar cover according to an embodiment.

[0036] Figure 6 FIG1 is a schematic structural diagram showing a metal plate according to an embodiment.

[0037] Figure 7 1 is a schematic structural diagram showing a fixed mold device according to an embodiment.

[0038] Figure 8 The figure is a schematic diagram showing the layout of the lower cooling channel cooling the molding cavity according to one embodiment.

[0039] In the figure, there are a fixed mold device 10; a molding groove 11; a fixed mold column 12; a molding boss 13; a positioning rib 14; a movable mold device 20; a molding groove 21; a supporting boss 22; a movable mold column 23; a horn insert 24; a lower cooling channel 25; a branch groove 26; a main exhaust groove 27; a side exhaust groove 28; a B-pillar cover 30; a metal plate 31; a first wall 311; a second wall 312; a third wall 313; a fourth wall 314; a fifth wall 315; a first bending edge 316; a second bending edge 317; a reinforcement hole 318; an accommodating portion 319; a cover body 32; a smooth curved surface 321; a first space 322; and a second space 323. DETAILED DESCRIPTION

[0040] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inside", "outside" and the like indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0041] like Figures 1 to 4 As shown, the present invention provides a processing method for a B-pillar cover 30. The B-pillar cover 30 is a long, thin-walled structural member. The B-pillar cover 30 is used to install a camera module, a control module, etc., so as to realize the extended function of the corresponding vehicle on the B-pillar. The B-pillar cover 30 includes a metal plate 31 formed by bending a thin plate and a cover body 32 extending from the metal plate 31 to both ends. The metal plate 31 has a heat dissipation effect. For example, the metal plate 31 is made of a stainless steel plate, an aluminum plate, a copper plate or other metal plates to improve the heat dissipation effect of the B-pillar cover 30. Preferably, the metal plate 31 is formed with a concave accommodating portion 319. The accommodating portion 319 is used to accommodate electronic components or circuit boards. The metal plate 31 can be used as a heat dissipation portion to fit the heat-generating portion of the circuit board, thereby achieving efficient heat dissipation of the B-pillar cover 30.

[0042] A smooth curved surface 321 is formed on one side of the B-pillar cover 30. This surface is designed to mate with the assembly components, facilitating a sealed connection. The smooth curved surface 321 serves as the assembly sealing surface for the B-pillar cover 30, thereby achieving a sealed assembly connection.

[0043] The B-pillar cover 30 is used to mount a circuit board. The cover body 32 is integrally formed with the metal plate 31. The cover body 32 forms a sealed area within the accommodating portion 319, with the smooth curved surface 321 facing away from the opening of the accommodating portion 319. The circuit board is located within the accommodating portion 319 and at least partially engages the metal plate 31. Furthermore, a camera mounting hole is provided in the cover body 32 for mounting a camera.

[0044] The metal plate 31 is provided with a plurality of reinforcing holes 318 extending therethrough, with the reinforcing holes 318 being located near the edges of the metal plate 31. During the molding process of the cover body 32, hot melt plastic fluid coats both sides of the metal plate 31. The cover body 32 penetrates both sides at the reinforcing holes 318, which not only improves the tightness of the connection between the cover body 32 and the metal plate 31, but also increases the strength of the junction between the two.

[0045] The B-pillar cover plate 30 is processed by injection molding. The processing method of the B-pillar cover plate 30 includes the following steps:

[0046] S101: Apply adhesive to at least a portion of the surfaces on both sides of the metal sheet 31. The adhesive adheres to the surface of the metal sheet 31 and improves the bonding strength between the metal sheet 31 and the plastic portion during the molding process. For example, the adhesive can be epoxy, polyurethane, or acrylic adhesive. The adhesive is applied to an area larger than the bonding area between the metal sheet 31 and the cover body 32 to enhance the bonding effect. The adhesive further strengthens the bonding between the metal sheet 31 and the cover body 32.

[0047] S102: The receiving portion 319 of the metal sheet 31 is snapped into engagement with the movable mold assembly 20. The metal sheet 31 is continuously bent to form a bent metal sheet, wherein the receiving portion 319 is a recessed space formed by the bending of the metal sheet 31. The metal sheet 31 is snapped into engagement with the movable mold assembly 20 to achieve snap-fit ​​positioning. At least a portion of the edge of the metal sheet 31 is extended or bent to increase the bonding area between the metal sheet 31 and the plastic part.

[0048] like Figures 3 to 6 As shown, in one embodiment, the metal sheet 31 includes a first wall 311, a second wall 312, a third wall 313, a fourth wall 314, and a fifth wall 315 that are continuously bent. The second wall 312, the third wall 313, and the fourth wall 314 form a concave receiving portion 319. The second wall 312, the third wall 313, and the fourth wall 314 form a U-shaped structure. The first wall 311 and the fifth wall 315 protrude in opposite directions and extend to conform to the shape of the cover body 32. To further enhance the structural stability of the metal sheet 31, the second wall 312 is configured with a curved portion to improve the structural stability of the second wall 312.

[0049] Furthermore, the two sides of the first wall 311 are bent to form two sets of first bent edges 316 with an expansion angle. The two sets of first bent edges 316 are located on opposite sides of the first wall 311, and the two sets of first bent edges 316 are relatively inclined to facilitate tilting. Preferably, the two sets of first bent edges 316 are symmetrically distributed on both sides of the first wall 311. The two sides of the third wall 313 are bent to form two sets of second bent edges 317 with an expansion angle. The second bent edges 317 are distributed on opposite sides of the third wall 313. Based on the same principle, the second bent edges 317 can be understood with reference to the structure of the first bent edges 316. The first bent edges 316 and the second bent edges 317 are away from the opening direction of the accommodating portion 319. The second bent edges 317 can strengthen the structural strength of the accommodating portion 319 area, thereby keeping the third wall 313 in a planar state, and then improving the consistency of the bonding surface between the circuit board and the third wall 313. In particular, the two sets of second bent edges 317 , the second wall 312 and the fourth wall 314 form a four-sided bent structure of the third wall 313 , thereby improving the structural stability of the third wall 313 .

[0050] Furthermore, the first and second bent edges 316, 317 are both contained within the cover body 32. The height difference between the first and second bent edges 316, 317 enhances the structural strength of the cover body 32. Reinforcement holes 318 are distributed throughout the first and second bent edges 316, 317, the first wall 311, and the fifth wall 315, covering the corresponding areas of the cover body 32. The reinforcement holes 318 connect the two sides of the metal sheet 31, preventing the metal sheet 31 and the cover body 32 from being connected solely by adsorption, thereby significantly improving the bonding strength between the cover body 32 and the metal sheet 31.

[0051] S103, control the movable mold assembly 20 to close with the fixed mold assembly 10. The fixed mold assembly 10 is provided with a plurality of fixed mold columns 12, and the movable mold assembly 20 is provided with a plurality of movable mold columns 23. The fixed mold columns 12 and the movable mold columns 23 close together to clamp the metal sheet 31 and suspend the periphery of the metal sheet 31, with the reinforcement holes 318 located within the suspended range. After the metal sheet 31 is buckled into place, the movable mold assembly 20 is driven by the injection molding machine to close the mold against the fixed mold assembly 10. A molding cavity is formed between the movable mold assembly 20 and the fixed mold assembly 10, and the metal sheet 31 is located within the molding cavity. The fixed mold columns 12 and the movable mold columns 23 are boss structures distributed within the molding cavity. The movable mold columns 23 are respectively clamped on both sides of the metal sheet 31, thereby further fixing the metal sheet 31.

[0052] In a specific embodiment, the fixed mold column 12 and the movable mold column 23 are respectively clamped on the first wall 311 and the fifth wall 315 to achieve overhead clamping at both ends. Further preferably, the fixed mold column 12 and the movable mold column 23 are respectively staggered with the reinforcement hole 318.

[0053] S104: Control the injection head assembly to inject hot melt plastic fluid into the molding cavity. The movable mold assembly 20 is provided with an injection channel, with the injection direction of the injection channel facing away from the smooth curved surface 321. The hot melt plastic fluid material is injected into the molding cavity along the injection channel, avoiding the smooth curved surface 321. This prevents the formation of injection holes on the surface and sides of the smooth curved surface 321, significantly improving the surface quality of the smooth curved surface 321.

[0054] S105 , controlling the cooling mechanism to cool the molding cavity, and then opening the mold to remove the B-pillar cover 30 .

[0055] The metal plate 31 and the cover body 32 are integrally formed, with the cover body 32 wrapping around the edges of the metal plate 31. The joint between the cover body 32 and the metal plate 31 is airtight and highly rigid. This integral formation significantly improves heat dissipation and assembly sealing of the B-pillar cover 30.

[0056] In the above step S101, the adhesive is applied to at least part of the surfaces of both sides of the metal plate 31, including the following steps:

[0057] S201: Clean the entire surface of the metal sheet 31, removing oil, dust, and other debris from the metal sheet 31, thereby improving the surface adsorption of the metal sheet 31. Optionally, the metal sheet 31 may be cleaned in a cleaning solution and then dried; further, the metal sheet 31 may be immersed in the cleaning solution and ultrasonically cleaned to avoid shape changes of the metal sheet 31.

[0058] S202, clamping the metal plate 31 on both sides of the corresponding receiving portion 319. The periphery of the metal plate 31 is molded with the hot-melt plastic fluid material, and the surface of the receiving portion 319 needs to be exposed to avoid being covered by the cover plate body 32. Therefore, clamping in the receiving portion 319 can facilitate the application of the adhesive and the control of the coating area of ​​the metal plate 31. For example, the clamping tool is provided with two clamping blocks, which are respectively clamped on the two side surfaces of the receiving portion 319, so as to shield the central area of ​​the receiving portion 319 and flexibly adjust the coating angle of the metal plate 31.

[0059] S203, applying adhesive to the exposed surface of the metal plate 31. The adhesive is attached to the exposed surface of the metal plate 31 by soaking, spraying or brushing, which reduces the brushing restriction on the metal plate 31, improves the coating efficiency and the control of the coating area.

[0060] In step S102, the receiving portion 319 of the metal plate 31 is engaged with the movable mold device 20, which specifically includes the following steps:

[0061] The receiving portion 319 of the metal plate 31 is clamped to the supporting boss 22 of the movable mold device 20 . The movable mold device 20 is provided with a concave molding groove 21 , and the supporting boss 22 partially protrudes from the bottom of the molding groove 21 .

[0062] The positions and postures of the bent edges on opposite sides of the metal plate 31 toward the fixed mold device 10 are adjusted, and lateral flow channels are formed between the bent edges and the wall surface of the molding cavity.

[0063] The support boss 22 is a block-shaped raised structure with a top surface smaller than the surface of the third wall 313. The second wall 312 and the fourth wall 314 at least partially conform to opposite sides of the support boss 22, thereby securing the metal sheet 31 to the support boss 22. Preferably, the top surface of the support boss 22 is smaller than the surface of the third wall 313. Accordingly, the plastic can cover the gap between the support boss 22 and the third wall 313, thereby achieving edge coverage.

[0064] Furthermore, the third wall 313 is provided with a plurality of reinforcement holes 318 to improve the tightness of the connection between the third wall 313 and the cover body 32 .

[0065] Preferably, the metal sheet 31 is stamped from a 0.1mm-0.5mm aluminum alloy sheet, which can not only achieve the consistency of the metal sheet 31 but also keep the metal sheet 31 adapted to the thin-walled B-pillar cover 30 structure, with a plastic layer of corresponding thickness on both sides of the metal sheet 31.

[0066] like Figures 3 to 7 As shown, the two sets of second bent edges 317 protrude in a direction away from the support boss 22. Accordingly, the second bent edges 317 are entirely covered by the cover plate body 32. A flow channel space is defined between the inner side of the second bent edge 317 and the support boss 22, and a lateral flow channel is defined between the outer side of the second bent edge 317 and the groove wall of the molding groove 21. The lateral flow channel can connect the opposite sides of the metal sheet 31, thereby improving the flowability of the hot melt plastic fluid material and maintaining the quality reliability within the covering range. The principles of the first bent edge 316 and the second bent edge 317 are similar and can be understood by reference. The difference is that the first bent edge 316 is located between the groove wall of the molding groove 21 and the raised portion of the fixed mold device 10.

[0067] Preferably, the first bending edge 316 and the second bending edge 317 are both raised bending structures. Furthermore, the first bending edge 316 and the second bending edge 317 are provided with three to five reinforcement holes 318 to connect the cover plate body 32 on both side surfaces of the first bending edge 316 and the second bending edge 317, and have high tensile strength.

[0068] Furthermore, there are multiple reinforcement holes 318 on the edges of the third wall 313, and the two sides of the third wall 313 in the area where the reinforcement holes 318 are located are suspended, so that the cover body 32 is wrapped around the edge of the third wall 313, which not only enhances the structural strength and stability of the third wall 313, but also can always keep the cover body 32 and the metal plate 31 tightly and stably combined even if the metal plate 31 is affected by bending and torsion.

[0069] In step S103 , the movable mold assembly 20 and the fixed mold assembly 10 are controlled to close together, and the process also includes: controlling the forming boss 13 to be inserted into the area between the bent edges, and pushing the metal sheet 31 to be centered.

[0070] Among them, the fixed mold device 10 includes a forming boss 13, a partially concave forming groove 11 and a plurality of positioning ribs 14 distributed on both sides of the forming groove 11. The forming boss 13 is inserted into the forming groove 21, the supporting boss 22 is inserted into the forming groove 11, and the positioning ribs 14 are respectively inserted between the two bent edges and push the metal sheet 31 to slide along the supporting boss 22.

[0071] The metal sheet 31 is snap-fitted to the support boss 22 to provide first-axis positioning. The forming boss 13 and the support boss 22 form a complementary structure to jointly clamp and position the metal sheet 31. The fixed mold column 12 is located on the forming boss 13, and the movable mold column 23 is located on the support boss 22. The forming cavity is formed by the combination of the forming boss 13 and the forming groove 21.

[0072] Before the fixed mold column 12 and the movable mold column 23 clamp the metal sheet 31, the positioning rib 14 engages and pushes against the first bent edge 316 and the second bent edge 317, thereby fine-tuning the metal sheet 31 in the second direction. The first and second directions are perpendicular to each other. Optionally, each side of the forming boss 13 is provided with at least two forming ribs.

[0073] like Figures 3 to 7 As shown, after the movable mold assembly 20 and the fixed mold assembly 10 are closed, the fixed mold column 12 and the movable mold column 23 are closed and clamped, and a hollow space is formed between the bottom of the molding groove 11 and the surface of the accommodating portion 319. One side surface of the third wall 313 is in contact with the top surface of the molding boss 13, and a hollow space is formed between the other side surface of the third wall 313 and the bottom of the molding groove 11. The periphery of the hollow space blocks the inflow of hot-melt plastic fluid, thereby preventing the central portion of the accommodating portion 319 from being filled with plastic fluid. The provision of the hollow space can provide the metal sheet 31 with space to release internal pressure due to thermal expansion and contraction, thereby preventing subsequent distortion.

[0074] The B-pillar cover 30 is surrounded by a flange. A smooth curved surface 321 is located on a first side of the flange, while the raised portion of the metal plate 31 and the cover body 32 is located on a second side of the flange. Preferably, the flange is an annular structure. To avoid the formation of a gate on the surface or side of the smooth curved surface 321, the gate of the B-pillar cover 30 is located on the second side of the flange.

[0075] In one embodiment, the movable mold assembly 20 includes a movable mold core and two horn inserts 24 located on either side of the molding groove 21. The metal sheet 31 is located between the two horn inserts 24. The movable mold core is provided with a main channel and branch channels connected to the horn inserts 24. The horn inserts 24 are provided with horn injection channels to eliminate the gate on the side of the smooth curved surface 321, greatly improving quality.

[0076] Furthermore, the metal plate 31 is located between the two bull horn inserts 24, so that the bull horn glue injection channel flows from the middle section of both sides to the metal plate 31, thereby improving the balance of the hot melt plastic fluid injection; and, the hot melt plastic fluid is injected from both ends of the metal plate 31, which can reduce the impact of the hot melt plastic fluid on the length fluidity of the metal plate 31, reduce the internal pressure of the deformation, thereby maintaining the structural stability of the metal plate 31, and improving the tightness of the bonding between the hot melt plastic fluid and the metal plate 31.

[0077] like Figure 3 and Figure 8 As shown, to accommodate the injection and cladding of a metal sheet 31 using double horn inserts 24, the movable mold core is equipped with a main venting groove 27 and side venting grooves 28 surrounding the molding cavity. Both the main venting groove 27 and the side venting groove 28 are connected to the molding cavity via multiple branch grooves 26. The main venting groove 27 and the main channel are arranged opposite each other. The main venting groove 27 and the side venting groove 28 surround the molding cavity on three sides, and the two horn inserts 24 are located on the fourth side. During the injection of the hot melt plastic fluid, the gas in the molding cavity can be discharged circumferentially, greatly improving the molding stability of the plastic part and reducing stress.

[0078] Preferably, the main exhaust groove 27 and the side exhaust groove 28 are U-shaped or C-shaped exhaust structures, and multiple branch grooves 26 are provided to achieve balanced air conduction and greatly improve stability. In particular, the two bull horn glue injection channels are injected from the middle area at both ends of the metal plate 31 to achieve rapid filling of hot-melt plastic fluid material with fewer air holes.

[0079] Furthermore, the molding cavity includes a first space 322 and a second space 323 located on either side of the metal sheet 31. The volume of the first space 322 is less than or equal to half of the volume of the second space 323. The cover body 32 is a thin-walled shell structure that gradually expands from one end to the other. The first space 322 is approximately half the volume of the second space 323. By adjusting the gate position and combining the main vent grooves 27 and side vent grooves 28, the overall injection molding effect of the B-pillar cover 30 with the metal sheet 31 structure is basically the same, thereby improving overall performance balance.

[0080] One horn insert 24 is located at the intersection of the first space 322 and the metal plate 31; the other horn insert 24 is located in the middle of the second space 323. The gate position of the horn injection runner is adjusted to optimize mold flow and facilitate the adhesion of hot-melt plastic fluid material to the channel space of the metal plate 31.

[0081] Furthermore, the movable mold assembly 20 and the fixed mold assembly 10 are provided with two molding cavities, which are arranged in a clockwise, complementary manner. The two molding cavities improve production efficiency. The B-pillar cover 30 has an unbalanced structure, with the two molding cavities located on either side of the main flow channel and adopting a complementary structure, which can balance the overall thermal energy of the mold.

[0082] Furthermore, the fixed mold assembly 10 is provided with an upper cooling channel, and the movable mold assembly 20 is provided with a lower cooling channel 25. The return channel of the lower cooling channel 25 is the same as the return channel of the upper cooling channel. In the projection direction on the mold surface, the projection of the upper cooling channel coincides with the projection of the lower cooling channel 25, and the two molding cavities are at least partially within the projection range.

[0083] Both the upper and lower cooling channels 25 can flow with cooling medium, which exchanges heat during circulation, lowering the molding cavity and mold temperature, thereby cooling the hot-melt plastic fluid material and forming it. The cooling area of ​​the upper and lower cooling channels 25 is the same, cooling both sides of the molding cavity, thereby achieving balanced cooling and high cooling consistency.

[0084] In one embodiment, the upper cooling channel and the lower cooling channel 25 have a channel structure approximately in the shape of a Chinese character "concave" to form a continuous cooling area, thereby performing directionally cooling on the first space 322 and the second space 323 .

[0085] It should be understood that the present application is not limited to the precise structure described above and shown in the accompanying drawings, and that various modifications and variations may be made without departing from the scope thereof. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of this application and include common knowledge or customary techniques in the art that are not disclosed herein.

Claims

1. A method for processing a B-pillar cover, characterized in that: The B-pillar cover includes a metal plate formed by bending a thin plate and a cover body extending from the metal plate to both ends. The metal plate is provided with a plurality of reinforcing holes therethrough. One side surface of the B-pillar cover is formed with a smooth curved surface. The processing method includes: applying adhesive to at least a portion of the surface of both sides of the metal sheet; Snap the receiving portion of the metal sheet into engagement with the movable mold device; Controlling the movable mold device and the fixed mold device to close, the fixed mold device being provided with a plurality of fixed mold columns, and the movable mold device being provided with a plurality of movable mold columns; the fixed mold columns and the movable mold columns being closed together to clamp the metal plate and to lift the periphery of the metal plate, and the reinforcement hole being located within the lifting range; Controlling the injection head device to inject hot melt material into the molding cavity, wherein the movable mold device is provided with an injection flow channel, and the injection direction of the injection flow channel is opposite to the smooth curved surface; Control the cooling mechanism to cool the molding cavity, then open the mold and remove the B-pillar cover; The device for snapping the receiving portion of the metal plate into the movable mold comprises: Clamping the receiving portion of the metal sheet to the supporting boss of the movable mold device, wherein the movable mold device is provided with a concave forming groove, and the supporting boss partially protrudes from the bottom of the forming groove; Adjusting the positions of the bent edges on opposite sides of the metal sheet toward the fixed mold device, wherein a lateral flow channel is provided between the bent edges and the wall surface of the forming cavity; The controlling mechanism of closing the movable mold device and the fixed mold device further comprises: Control the insertion of forming bosses into the area between the bend edges and push the metal sheet to the center; Among them, the fixed mold device includes a forming boss, a partially concave forming groove and a plurality of positioning ribs distributed on both sides of the forming groove. The forming boss is inserted into the forming groove, the supporting boss is inserted into the forming groove, and the positioning ribs are respectively inserted between the two bent edges and push the metal sheet to slide along the supporting boss.

2. The processing method according to claim 1, characterized in that: The step of coating at least a portion of the surfaces of both sides of the metal plate with a binder comprises: Cleaning the entire surface of the metal sheet; clamped on both sides of the metal plate corresponding to the receiving portion; Apply adhesive to the exposed surface of the metal sheet.

3. The processing method according to claim 1, characterized in that: A hollow space is defined between the bottom of the forming groove and the surface of the accommodation portion.

4. The processing method according to claim 1, characterized in that: The movable mold device includes a movable mold core and two horn inserts located on one side of the molding groove, the horn inserts are provided with horn glue injection channels, the metal plate is located between the two horn inserts, and the movable mold core is provided with a main channel and branch channels respectively connected to the horn inserts; The movable mold core is provided with a main exhaust groove and a side exhaust groove surrounding the molding cavity. The main exhaust groove and the side exhaust groove are connected to the molding cavity through a plurality of branch grooves. The main exhaust groove and the main channel are arranged opposite to each other.

5. The processing method according to claim 4, characterized in that: The forming cavity includes a first space and a second space located on both sides of the metal sheet, the volume of the first space is less than or equal to half of the second space, one of the horn inserts is located in the intersection area of ​​the first space and the metal sheet; the other horn insert is located in the middle area of ​​the second space.

6. The processing method according to claim 1, characterized in that: The movable mold device and the fixed mold device are provided with two molding cavities, and the two molding cavities are arranged in a clockwise complementary manner. The fixed mold device is provided with an upper cooling channel, and the movable mold device is provided with a lower cooling channel. The return channel of the lower cooling channel is the same as the return channel of the upper cooling channel. In the projection direction on the mold closing surface, the projection of the upper cooling channel coincides with the projection of the lower cooling channel, and the two molding cavities are at least partially within the projection range.

7. The processing method according to claim 1, characterized in that: The metal sheet includes a first wall, a second wall, a third wall, a fourth wall and a fifth wall that are continuously bent, and the second wall, the third wall and the fourth wall form a concave accommodating portion; the first wall is bent on both sides to form two groups of first bent edges with an expansion angle, and the third wall is bent on both sides to form two groups of second bent edges with an expansion angle, the first bent edge and the second bent edge are away from the opening direction of the accommodating portion and have a height difference, and the reinforcement holes are distributed on the first bent edge and the second bent edge, the first wall and the fifth wall.

8. The processing method according to claim 7, characterized in that: The third wall is provided with a plurality of reinforcement holes, and the metal plate is punched from an aluminum alloy plate having a thickness of 0.1 mm to 0.5 mm.

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