High-precision double-color injection mold structure for automobile cavity cover

Abstract

The application relates to a high-precision double-color injection mold structure for a car cavity cover, and belongs to the technical field of double-color molds. The double-color injection mold structure comprises a core, a hard-plastic hot runner system, a soft-gum hot runner system, an insert piece arranged on the core, a wedge block for positioning and pressing the insert piece, and a sliding block system slidably arranged on the core and used for adjusting an injection cavity. The sliding block system comprises a plurality of piece-type glue-sealing sliding blocks arranged in an array and matched with the insert piece, a guide block arranged on the insert piece and guiding the sliding of the piece-type glue-sealing sliding blocks, a guide pushing block matched with the sliding of the piece-type glue-sealing sliding blocks, and a moving driving piece for driving the guide pushing block to move. The application improves the stability of the sliding block mechanism and reduces the probability of the traditional sliding block being stuck due to thermal expansion in the mold.

Description

Technical Field

[0001] This application relates to the field of two-color mold technology, and in particular to a high-precision two-color injection mold structure for automotive cavity covers. Background Technology

[0002] With the rapid development of automation and precision manufacturing technologies, providing more innovative solutions for the manufacturing industry has become an inevitable requirement. Two-color injection molding technology has received widespread attention and application due to its ability to give products a two- or multi-color appearance. Two-color injection molding is a molding technology that fuses two different colors of plastic together in a single molding process.

[0003] Reference Figure 1 A two-color molded car cavity cover 7 includes a first injection molded part 71 and a second injection molded part 72. The first injection molded part 71 is a hard plastic body, and the second injection molded part 72 is a soft rubber material. As a large two-color injection molded product, the car cavity cover 7 differs from the common form of hard plastic surface covered with soft rubber. It consists of a hard plastic body and a soft rubber portion fused together at the edge. Traditional two-color mold slider mechanisms often use a T-slot wedge-type mating structure. In actual production, this mating structure is prone to jamming and damage due to thermal expansion within the mold. Summary of the Invention

[0004] In order to improve the stability of the slider mechanism and reduce the jamming caused by the thermal expansion of the traditional slider in the mold, this application provides a high-precision two-color injection mold structure for automotive cavity covers.

[0005] The high-precision two-color injection mold structure for automotive cavity covers provided in this application adopts the following technical solution:

[0006] A high-precision two-color injection mold structure for automotive cavity covers includes a core, a hard plastic hot runner system, a soft plastic hot runner system, inserts disposed on the core, wedge blocks for positioning and clamping the inserts, and a slider system slidably mounted on the core for adjusting the injection cavity. The slider system includes multiple sets of sheet-type sealing sliders arranged and fitted with the inserts, guide blocks disposed on the inserts and guiding the sheet-type sealing sliders to slide, guide blocks that slide with the sheet-type sealing sliders, and a moving drive component that drives the guide blocks to move.

[0007] The guide block has a first station away from the moving drive component and a second station close to the moving drive component. When the guide block is in the first station, the top surface of the sheet-type sealing slider is flush with the insert and fits the cavity surface (not shown in the picture), and the mold structure forms a first molding chamber. The hard plastic hot runner system is connected to the first molding chamber. When the guide block switches to the second station, the sheet-type sealing slider moves so that the sheet-type sealing slider, the insert, the cavity (not shown in the picture), and the first injection molded part form a second molding chamber. The second molding chamber is connected to the soft plastic hot runner system.

[0008] By adopting the above technical solution, multiple sets of sheet-type sealing sliders are arranged and assembled, and fitted with the insert. Combined with guide blocks, guide pins, and moving drive components, the injection cavity can be precisely adjusted. When the guide pin is in the first station, the top surface of the sheet-type sealing slider protrudes from the insert and fits against the front mold cavity surface (not shown in the image) to form the first molding chamber, which can be used for hard plastic injection molding. When the guide pin switches to the second station, the sheet-type sealing slider moves to create space for soft plastic injection, forming the second molding chamber and connecting it to the soft plastic hot runner system, which can be used for soft plastic injection molding. The guide pin structure used in this application avoids the problem of traditional T-slot wedge-type mating structures easily jamming and being damaged by thermal expansion.

[0009] Optionally, the insert includes a first insert and a second insert, and the wedge block includes a first wedge block group corresponding to the first insert and a second wedge block group corresponding to the second insert, wherein each of the first wedge block groups is provided with an inclined surface that fits the core.

[0010] By adopting the above technical solution, the insert is divided into a first insert and a second insert. The first wedge block group and the second wedge block group are used to position and press the insert accordingly. The first wedge block group is equipped with an extrusion inclined surface to fit the core, which can more accurately position and press the insert, avoid displacement of the insert during injection molding, improve the stability of the mold structure and the injection precision, and thus ensure the molding quality of the car cavity cover.

[0011] Optionally, the top of the insert is provided with a soft rubber delivery groove that connects to the soft rubber hot runner system, and the insert has a flow pipe at one end of the soft rubber delivery groove that penetrates the top surface of the insert and communicates with the second molding chamber.

[0012] By adopting the above technical solution, a soft rubber conveying groove is opened on the top of the insert to connect with the soft rubber hot runner system. The insert has a flow pipe that penetrates the top surface of the insert and connects with the second molding chamber at one end of the soft rubber conveying groove, so that the soft rubber can be smoothly conveyed from the soft rubber hot runner system to the second molding chamber.

[0013] Optionally, the slider system has three sets of sheet-type sealing sliders, which are sequentially designated as a first sealing slider, a second sealing slider, and a third sealing slider.

[0014] By adopting the above technical solution, three sets of sealing sliders are used to separate the two molding chambers. Compared with using a single large slider, this ensures mold accuracy, effectively prevents deformation, reduces processing difficulty and cost, and facilitates disassembly and local maintenance.

[0015] Optionally, both the first and second sealing sliders are provided with guide holes for relative sliding engagement with the guide block. The guide block is provided with a locking bolt for fixing the insert. The guide block and the guide hole on the sheet sealing slider are in vertical sliding engagement. The guide block and the guide hole on the sheet sealing slider are in sliding engagement on both sides in the vertical movement direction.

[0016] By adopting the above technical solution, the first and second sealing sliders are provided with guide holes on the side facing the insert. The guide block is fixed to the insert by locking bolts and the other end is limited in the guide hole to prevent the sheet sealing slider from shifting left and right and to precisely control the up and down movement of the slider.

[0017] Optionally, the bottom of the first sealing slider, the second sealing slider, and the third sealing slider are further provided with guide posts, and the core is provided with guide post holes that cooperate with the guide posts.

[0018] By adopting the above technical solution, guide posts are set at the bottom of the first, second, and third sealing sliders, and guide post holes are set on the core accordingly. This makes the sliding of the sheet sealing slider on the core more stable and precise, thereby improving the injection accuracy of the mold and the quality of the product.

[0019] Optionally, the guide block includes a sliding part and a driving part, the sheet-type sealing slider is provided with a square oblique hole for the driving part to slide, and the driving part has a driving inclined surface that abuts against the square oblique hole.

[0020] By adopting the above technical solution, the guide block is divided into a sliding part and a driving part. A square oblique hole is provided in the sheet-type sealing slider for the driving part to slide and arrange. The driving part has a driving inclined surface that abuts against the square oblique hole. When the moving driving component drives the guide block to move, the cooperation between the driving inclined surface and the square oblique hole can drive the sheet-type sealing slider to move more stably and accurately.

[0021] Optionally, the core is provided with a drive through groove for the sliding part to slide, and one end of the drive through groove passes through the core.

[0022] By adopting the above technical solution, the core is provided with a drive groove for the sliding part to slide and one end of the core to pass through, which can ensure the smooth sliding of the guide block, so that the sheet sealing slider can move precisely to switch the molding chamber and realize the precise operation of two-color injection molding.

[0023] Optionally, a connecting component is further provided between the sliding part and the output end of the moving drive component. The connecting component includes a connecting block that snaps onto the guide block and a moving rod that fixes the connecting block and the moving drive component at both ends respectively.

[0024] By adopting the above technical solution, the sliding part and the output end of the moving drive are connected by a connecting component, the guide block is engaged by a connecting block, and the moving drive and the connecting block are connected at both ends of the moving rod, respectively. This allows the moving drive to be set on the outer side of the core and can stably drive the guide block to move, ensuring the normal operation of the slider system.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] Reduce the probability of the slider system jamming and being damaged due to thermal expansion during mass production, ensure normal mold use and injection molded product quality, and meet the mass production needs of large two-color injection molded products such as high-precision automotive cavity covers;

[0027] The connection structure between the three sets of sheet-type sealing sliders and the drive block abandons the traditional T-slot wedge structure. In this invention, the drive block structure is designed as a guide pull block mechanism. The guide pull block and the square oblique hole designed on the sheet-type sealing slider are obliquely inserted and slide in the front and back directions. When the hydraulic cylinder generates force, the guide pull block drives the sheet-type sealing slider to move up and down. Compared with the traditional T-slot fit structure, the design structure adopted by this invention can further enhance the stability of the slider system and effectively avoid the problem of jamming and damage caused by the expansion of the traditional T-slot slider structure due to heat in the mold. Attached Figure Description

[0028] Figure 1 This is a drawing of a two-color automotive cavity cover that needs to be injection molded according to this application.

[0029] Figure 2 This is an assembly diagram of the mold structure and the product on the rear mold according to an embodiment of this application.

[0030] Figure 3 This is an assembly diagram of the slider system and product according to an embodiment of this application.

[0031] Figure 4 This is a cross-sectional schematic diagram of the first insert in the soft rubber delivery groove according to an embodiment of this application.

[0032] Figure 5 This is an isometric view of the product and slider system structure according to an embodiment of this application.

[0033] Figure 6 yes Figure 3 A cross-sectional view of AA.

[0034] Figure 7yes Figure 3 A cross-sectional view of BB.

[0035] Figure 8 yes Figure 3 A cross-sectional view of CC.

[0036] Explanation of reference numerals in the attached drawings: 1. Core; 11. Molding groove; 12. Insert groove; 121. Guide post hole; 13. Drive channel; 2. Hard plastic hot runner system; 3. Soft plastic hot runner system; 4. Insert; 41. First insert; 42. Second insert; 43. Soft plastic conveying groove; 44. Flow channel; 5. Wedge block; 51. First wedge block group; 511. Inclined surface; 52. Second wedge block group; 6. Slider system; 61. Sheet-type sealing slider; 611. First 612. Sealing slider; 613. Second sealing slider; 614. Third sealing slider; 615. Guide hole; 616. Guide post; 617. Square oblique hole; 62. Guide block; 621. Locking bolt; 63. Guide block; 631. Sliding part; 632. Drive part; 6321. Drive inclined surface; 64. Moving drive component; 65. Connecting assembly; 651. Connecting block; 652. Connecting rod; 7. Car cavity cover; 71. First injection molded part; 72. Second injection molded part. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 2-8 This application will be described in further detail.

[0038] This application discloses a high-precision two-color injection mold structure for automotive cavity covers.

[0039] Reference Figure 2 A high-precision two-color injection mold structure for automotive cavity covers includes a core 1, a hard plastic hot runner system 2, a soft plastic hot runner system 3, an insert 4 disposed on the core 1, a wedge block for positioning and clamping the insert 4, and a slider system 6 slidably mounted on the core 1 for adjusting the injection cavity. The mold structure has a first molding chamber and a second molding chamber. The first molding chamber is connected to the hard plastic hot runner system 2 and is used to mold a first injection molded part 71; the second molding chamber is connected to the soft plastic hot runner system 3 and is used to mold a second injection molded part 72. The slider system 6 enables the second molding chamber to be connected to or closed with the first chamber.

[0040] Reference Figure 2 and Figure 3The core 1 has a molding groove 11 at its top for molding the first injection molded part 71. The insert 4 includes a first insert 41 and a second insert 42, with the arc surfaces of the first insert 41 and the second injection molded part 72 corresponding, and the corners of the second insert 42 and the second injection molded part 72 corresponding. The core 1 has an insert groove 12 at its top and on one side of the molding groove 11 for arranging the insert 4. The top of the insert 4 has a soft rubber delivery groove 43, which communicates with the soft rubber hot runner system 3. One end of the soft rubber delivery groove 43 has a flow channel 44 penetrating the top of the insert 4.

[0041] The wedge block 5 is used to abut against the insert 4 on the inner wall of the insert groove 12. In this embodiment, the wedge block 5 includes a first wedge block group 51 and a second wedge block group 52, both of which are located on the side of the insert groove 12 away from the forming groove 11.

[0042] Reference Figure 2 and Figure 4 The first wedge block group 51 corresponds to the first insert 41, and the first wedge block group 51 has two sets of mating wedge blocks. The second wedge block group 52 corresponds to the second insert 42, and the second wedge block group 52 has two sets of mating wedge blocks. Both the first wedge block group 51 and the second wedge block group 52 have inclined surfaces 511 that abut against the inner wall of the insert groove 12. The insert 4 is precisely positioned by the pressure of the inclined surfaces 511.

[0043] Reference Figure 5 The slider system 6 includes multiple sets of sheet-type sealing sliders 61, guide blocks 62 disposed on the insert 4 and used for guiding the sheet-type sealing sliders 61 left and right, guide blocks 63 that slide and cooperate with the sheet-type sealing sliders 61, and a moving drive member 64 that drives the guide blocks 63 to move. In this embodiment, the slider system 6 has three sets of sheet-type sealing sliders 61 and corresponding guide blocks 62, guide blocks 63, and moving drive members 64. The three sets of sheet-type sealing sliders 61 are defined as the first sealing slider 611, the second sealing slider 612, and the third sealing slider 613, respectively.

[0044] Reference Figure 5 and Figure 6The first sealing slider 611, the second sealing slider 612, and the third sealing slider 613 are fitted to the insert 4 and slide up and down the core 1. The sheet-type sealing slider 61 and the insert 4 are guided and slidably connected by a guide block 62, one end of which is provided with a locking bolt 621 for bolting to the insert 4. The first sealing slider 611 and the second sealing slider 612 each have a guide hole 614 on the side facing the insert 4, which mates with the guide block 62. The guide hole 614 and the first sealing slider 611 and the second sealing slider 612 slide vertically. Through the cooperation of the guide hole 614 and the guide block 62, the vertical movement of the first sealing slider 611 and the second sealing slider 612 can be precisely guided, eliminating the probability of left and right jumping during vertical sliding.

[0045] Reference Figure 5 and Figure 7 In order to further guide the sliding of the sheet-type sealing slider 61, the bottom of the first sealing slider 611, the second sealing slider 612 and the third sealing slider 613 are also provided with guide posts 615. One end of the guide post 615 is fixedly inserted into the bottom of the sheet-type sealing slider 61. The core 1 has a guide post hole 121 at the bottom of the insert groove 12 that is inserted and matched with the guide post 615.

[0046] Reference Figure 5 and Figure 8 The core 1 has a drive through groove 13 at the bottom of the insert groove 12 for the guide block 63 to slide horizontally. The guide block 63 includes a sliding part 631 that slides and engages with the drive through groove 13 and a drive part 632 that obliquely engages with the sheet-type sealing slider 61. The drive part 632 is inclined downward in a direction away from the sliding part 631 and has a drive inclined surface 6321. Both the first sealing slider 611 and the second sealing slider 612 have square oblique holes 616 through which the drive part 632 passes, and the square oblique holes 616 and the drive part 632 are adapted to be connected.

[0047] As the guide block 63 slides horizontally, the sheet-type sealing slider 61 slides precisely up and down under the limiting action of the guide block 62 and the guide post 615. All three sets of sheet-type sealing sliders 61 have straight molding ends and are made of beryllium copper. The high hardness, high wear resistance, corrosion resistance, and high thermal conductivity of beryllium copper reduce the additional costs of maintenance and replacement due to slider wear.

[0048] The movable drive component 64 is a prior art hydraulic cylinder, horizontally fixed to the outer edge of the core 1. A connecting assembly 65 is provided between the output shaft of the movable drive component 64 and the sliding part 631. The connecting assembly 65 includes a connecting block 651 and a connecting rod 652. The connecting block 651 and the sliding part 631 are engaged through a T-slot, and the connecting block 651 and the connecting rod 652 are also engaged through a T-slot. The other end of the connecting rod 652 is fixedly connected to the output shaft of the movable drive component 64. The three sets of movable drive components 64 achieve hydraulic synchronization through a series-parallel hydraulic circuit design, enabling the three sets of movable drive components 64 to start simultaneously and accurately complete the sliding movement of the three sets of sheet-type sealing sliders 61.

[0049] The implementation principle of a high-precision dual-color injection mold structure for automotive cavity covers in this application is as follows:

[0050] The driving of the moving drive 64 causes the guide block 63 to have a first station and a second station in the drive channel 13. When the guide block 63 is in the first station, the guide block 63 is located on the side of the drive channel 13 away from the moving drive 64. When the guide block 63 is in the second station, the guide block 63 is located on the side of the drive channel 13 closer to the moving drive 64.

[0051] In the first station, the top surface of the sheet-type sealing slider 61 is higher than the top of the insert 4. At this time, the top molding section of the sheet-type sealing slider 61 abuts against the cavity surface, and the first molding chamber and the second molding chamber are isolated and closed. The first injection molded part is formed by injection molding. When the moving drive 64 retracts, it drives the guide block 63 to move horizontally. The guide block 63 drives the three sets of sheet-type sealing sliders 61 to move downward, so that a second molding chamber is formed between the top of the sheet-type sealing slider 61, the top of the insert 4, the cavity surface, and the first injection molded part 71. The soft rubber hot runner system 3 is started, and the soft rubber is transported to the second molding chamber along the soft rubber conveying groove 43 and the flow pipe 44. The soft rubber fills the second molding chamber to form the second injection molded part 72. The second injection molded part 72 is fused and fixed at the edge of the first injection molded part 71 to form the car cavity cover 7.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-precision two-color injection mold structure for automotive cavity covers, characterized in that, The system includes a core (1), a hard plastic hot runner system (2), a soft plastic hot runner system (3), an insert (4) disposed on the core (1), a wedge block (5) for positioning and pressing the insert (4), and a slider system (6) slidably mounted on the core (1) for adjusting the injection cavity. The slider system (6) includes multiple sets of sheet-type sealing sliders (61) arranged and fitted with the insert (4), a guide block (62) disposed on the insert (4) and guiding the sheet-type sealing sliders (61) to slide, a guide block (63) that slides with the sheet-type sealing sliders (61), and a moving drive (64) that drives the guide block (63) to move. The slider system (6) has three sets of sheet-type sealing sliders (61), which are respectively the first sealing slider (611), the second sealing slider (612) and the third sealing slider (613). The bottom of the first sealing slider (611), the second sealing slider (612) and the third sealing slider (613) are also provided with guide posts (615), and the core (1) is provided with guide post holes (121) that cooperate with the guide posts (615). The guide block (63) includes a sliding part (631) and a driving part (632). The sheet-type sealing slider (61) is provided with a square oblique hole (616) for the driving part (632) to slide. The driving part (632) has a driving inclined surface (6321) that abuts against the square oblique hole (616). The guide block (63) has a first station away from the moving drive (64) and a second station close to the moving drive (64). When the guide block (63) is in the first station, the top surface of the sheet-type sealing slider (61) protrudes from the insert (4), and the mold structure forms a first molding chamber. The hard plastic hot runner system (2) is connected to the first molding chamber. When the guide block (63) switches to the second station, the sheet-type sealing slider (61) moves so that the sheet-type sealing slider (61), the insert (4), and the first injection molded part (71) that has been injection molded form a second molding chamber. The second molding chamber is connected to the soft plastic hot runner system (3).

2. The high-precision automotive cavity cover two-color injection mold structure according to claim 1, characterized in that, The insert (4) includes a first insert (41) and a second insert (42). The wedge block (5) includes a first wedge block group (51) corresponding to the first insert (41) and a second wedge block group (52) corresponding to the second insert (42). Both the first wedge block group (51) and the second wedge block group (52) are provided with inclined surfaces (511) that fit the core (1).

3. The high-precision automotive cavity cover two-color injection mold structure according to claim 2, characterized in that, The top of the insert (4) is provided with a soft rubber delivery groove (43) that connects to the soft rubber hot runner system (3), and the insert (4) has a flow pipe (44) that penetrates the top surface of the insert (4) and connects to the second molding chamber at one end of the soft rubber delivery groove (43).

4. The high-precision automotive cavity cover two-color injection mold structure according to claim 1, characterized in that, The first sealing slider (611) and the second sealing slider (612) are both provided with guide holes (614) for relative sliding cooperation of the guide block (62). The guide block (62) is provided with a locking bolt (621) for fixing to the insert (4). The other end of the guide block (62) is limited and arranged on one side of the guide hole (614). The guide block (62) and the guide hole (614) on the sheet sealing slider (61) are in sliding cooperation on both sides in the up and down movement direction.

5. The high-precision automotive cavity cover two-color injection mold structure according to claim 1, characterized in that, The core (1) is provided with a drive through groove (13) for the sliding part (631) to slide, and one end of the drive through groove (13) passes through the core (1).

6. The high-precision automotive cavity cover two-color injection mold structure according to claim 1, characterized in that, A connecting component (65) is also provided between the output end of the sliding part (631) and the moving drive (64). The connecting component (65) includes a connecting block (651) that snaps into the guide block (63) and a moving rod that fixes the connecting block (651) and the moving drive (64) at both ends respectively.

Images