A plastic lower guard plate injection molding die for an automobile A column and a reverse buckle forming mechanism thereof

Abstract

The application relates to an injection molding die for a plastic lower guard plate of an automobile A column and a reverse buckle forming mechanism thereof, which comprises a movable die plate, a first sliding groove is arranged on the movable die plate, a first forming block is slidably arranged in the first sliding groove, a first power part is arranged on the movable die plate, and the first power part is used for driving the first forming block to slide; an inclined ejector block is slidably arranged in the first forming block, and the inclined ejector block is used for forming a reverse buckle; a mounting plate is arranged in the first sliding groove, an inclined ejector seat is arranged on the mounting plate, an inclined ejector rod is arranged on the inclined ejector seat, the inclined ejector rod extends into the first forming block and is connected with the inclined ejector block; a first sliding block is slidably arranged in the first forming block, the first sliding block is used for forming an I-shaped reinforcing rib, a second power part is arranged on the first forming block, and the second power part is used for driving the first sliding block to slide. The application can guarantee the smooth forming of an assembly part and related components and can also guarantee the smooth demolding of the assembly part.

Description

Technical Field

[0001] This invention relates to the field of molds, and in particular to an injection molding mold for a plastic lower guard plate for an automobile A-pillar and its undercut molding mechanism. Background Technology

[0002] A type of plastic lower guard plate for car A-pillars, such as Figures 20-23 As shown, the device includes a protective plate body 6. One end of the protective plate body 6 is raised to form an assembly part 61. The back of the assembly part 61 is provided with multiple crisscrossing first reinforcing ribs 62. At the same time, an undercut 63 is integrally formed on the back of the assembly part 61. The undercut 63 is provided with a snap-fit ​​groove 64. The side of the undercut 63 away from the assembly part 61 is provided with an I-shaped reinforcing rib 65.

[0003] The protective plate body 6 is injection molded using a mold. After the protective plate body 6 is injection molded, the undercut 63 wraps around the molding block of the mold. At this time, the molding block of the mold inserts into the snap-fit ​​groove 64, and the molding block of the mold and the undercut 63 form an undercut 63 structure, which hinders the demolding of the protective plate body 6. Therefore, a new molding structure needs to be designed to ensure that the undercut 63 is formed while the molding block of the mold used to form the undercut 63 can actively move away from the undercut 63 after the undercut 63 is formed, thereby removing the obstacle to the demolding of the protective plate body 6. Summary of the Invention

[0004] The technical solution provided in this application for an injection molding die for a plastic lower guard plate of an automobile A-pillar and its undercut molding mechanism is as follows: A snap-fit ​​molding mechanism for a plastic lower guard plate of an automobile A-pillar includes a movable template, a first sliding groove on the movable template, a first molding block slidably disposed in the first sliding groove, a first molding area on the first molding block for molding an assembly part, and a first molding groove on the first molding area for molding multiple first reinforcing ribs; the movable template also includes a first power unit for driving the first molding block to slide. An inclined push block is slidably disposed within the first molding block, the inclined push block being used to form an undercut; a mounting plate is provided within the first groove, the mounting plate is provided with an inclined push seat, the inclined push seat is provided with an inclined push rod, the inclined push rod extending into the first molding block and connecting with the inclined push block; when the first molding block moves toward the mounting plate, the first molding block presses against the inclined push rod, driving the inclined push rod and the inclined push block to move, so that the inclined push block moves out of the snap-fit ​​groove; when the inclined push block moves out of the snap-fit ​​groove, it always abuts against the assembly part, so as to restrict the assembly part from following the movement of the first molding block; A first slider is slidably disposed inside the first molding block. The first slider is used to form an I-shaped reinforcing rib. A second power unit is provided on the first molding block. The second power unit is used to drive the first slider to slide. When the inclined top block moves out of the snap-fit ​​groove, the second power unit drives the first slider to slide out of the first molding block so that the first slider always abuts against the I-shaped reinforcing rib and restricts the undercut from following the movement of the inclined top block.

[0005] By adopting the above technical solution, after the protective plate body is injection molded, the first power unit drives the first molding block to slide away from the assembly part and approach the mounting plate. During this process, multiple first reinforcing ribs disengage from the first molding groove, thus eliminating the inverted structure between multiple first reinforcing ribs and the first molding groove.

[0006] When the first molding block moves close to the mounting plate, it will press against the inclined push rod, causing the inclined push rod to slide on the inclined push seat. When the inclined push rod slides, it will drive the inclined push block to move, causing the inclined push block to extend out of the first molding block and move away from the undercut, gradually moving out of the snap-fit ​​groove.

[0007] When the first molding block moves close to the mounting plate, the second power unit drives the first slider to slide out of the first molding block, so that the first slider always abuts against the I-shaped reinforcing rib, and the two form an inverted structure, thereby restricting the inverted buckle from following the inclined top block when it moves, thus preventing the inverted buckle from being deformed and strained.

[0008] Meanwhile, when the first molding block moves away from the assembly part, the inclined top block and the first slider will restrict the assembly part and multiple first reinforcing ribs from following the movement of the first molding block, ensuring that the first molding block can be smoothly separated from the assembly part and the first reinforcing ribs, reducing the probability of the assembly part and the first reinforcing ribs being strained when the first molding block moves.

[0009] Preferably, the first power unit includes a hydraulic cylinder disposed on the moving template and a connecting block slidably disposed in the first slide groove. The connecting block passes through the mounting plate, one end of the connecting block is connected to the telescopic shaft of the hydraulic cylinder, and the other end of the connecting block is connected to the first forming block.

[0010] By adopting the above technical solution, the extension of the hydraulic cylinder's telescopic shaft drives the connecting block and the first forming block to move away from the assembly part. The retraction of the hydraulic cylinder's telescopic shaft drives the connecting block and the first forming block to move back to their original positions.

[0011] Preferably, the mounting plate is slidably disposed in the first groove. When the first molding block moves away from the assembly part, it will abut against the mounting plate and drive the mounting plate to move away from the assembly part. The connecting block is integrally formed with a protrusion, which is located on the side of the mounting plate away from the moving template. The protrusion is used to push the mounting plate to move and reset. The second power unit includes a first connecting rod slidably disposed on the first molding block. The two ends of the first connecting rod are respectively connected to the first slider and the mounting plate. When the first molding block moves closer to the mounting plate, the first slider slides out of the first molding block.

[0012] By adopting the above technical solution, in the initial state, the protrusion abuts against the mounting plate. During the movement of the first molding block away from the assembly part, the first molding block initially drives the protrusion to move, with the first molding block moving closer to the mounting plate and the protrusion moving away from the mounting plate. During this stage, under the action of the first connecting rod, the first slider will not move with the first molding block. Therefore, relative to the first molding block, the first slider will slide out of the first molding block and always abut against the I-shaped reinforcing rib.

[0013] Once the first molding block moves to contact the mounting plate, it pushes the mounting plate to move together, so that the mounting plate and the first molding block slide away from the assembly part synchronously. When the mounting plate moves away from the assembly part, it drives the first slider to move away from the I-shaped reinforcing rib through the first connecting rod, thus releasing the I-shaped reinforcing rib.

[0014] During the subsequent resetting process of the first molding block, the first molding block first slides away from the mounting plate, causing the inclined push block and the first slider to move into the first molding block. After the inclined push block and the first slider move to contact the first molding block, the protrusion also moves to contact the mounting plate. When the first molding block continues to move and reset, the protrusion will push the mounting plate to move and reset.

[0015] Preferably, a stop block and a third connecting rod are slidably disposed on the first molding block. The stop block is located in the first molding area and is used to mold the assembly part. The two ends of the third connecting rod are respectively connected to the stop block and the mounting plate.

[0016] By adopting the above technical solution, during the process of the first molding block moving away from the assembly part on its own, the abutment block, the inclined push block, and the first slider together restrict the assembly part and multiple first reinforcing ribs from moving with the first molding block. When the first molding block pushes the mounting plate to move together, the mounting plate drives the abutment block to move together through the third connecting rod, so that the abutment block moves away from the assembly part, completing the separation from the assembly part.

[0017] During the subsequent reset process of the first slider, the first molding block moves away from the mounting plate, and the abutment block moves back into the first molding block to complete the reset.

[0018] Preferably, the first groove is further provided with a limiting block, which is located on the side of the mounting plate away from the first forming block; two support legs are slidably connected to the limiting block, and both support legs are connected to the mounting plate.

[0019] By adopting the above technical solution, a limiting block is set to limit the sliding stop position of the first forming block and the mounting plate. Two support legs are set to ensure that the mounting plate can slide smoothly.

[0020] Preferably, the first molding block has a first assembly hole, and the second power unit includes a second slider slidably disposed in the first assembly hole, a second connecting rod for connecting the first slider and the second slider, a first spring disposed in the first assembly hole, a T-shaped block slidably disposed on the inclined top block, a slot disposed on the second slider, and a second spring disposed on the inclined top block; the first spring is sleeved on the second connecting rod, one end of the first spring abuts against the wall of the first assembly hole, and the other end of the first spring abuts against the second slider, and the first spring always drives the second slider to move toward the mounting plate; the inclined top block has a second assembly cavity, one end of the T-shaped block is slidably disposed in the second assembly cavity, and the other end of the T-shaped block extends out of the inclined top block and is inserted into the slot, the second spring is disposed in the second assembly cavity, the second spring is located on the side of the T-shaped block facing away from the second slider, and the two ends of the second spring abut against the cavity wall of the second assembly cavity and the T-shaped block respectively, and the second spring restricts the T-shaped block from sliding into the second assembly cavity.

[0021] By adopting the above technical solution, in the mold-closed state, the T-block is inserted into the slot, thereby restricting the first slider from sliding away from the I-shaped reinforcing rib. As the first forming block moves away from the assembly part, the inclined ejector block gradually moves away from the undercut. Under the restriction of the T-block, the first slider will not follow the movement of the first forming block and will always be in contact with the I-shaped reinforcing rib. Therefore, the action of the first slider relative to the first forming block is to slide out of the first forming block. When the first slider slides out of the first forming block, it will drive the second slider to slide within the first assembly hole and press against the first spring via the second connecting rod.

[0022] As the inclined top block gradually moves away from the inverted clamp, it also drives the T-shaped block to gradually move out of the slot. Subsequently, when the T-shaped block moves out of the slot, the first spring rebounds and drives the second slider to slide towards the mounting plate. When the second slider slides, it drives the first slider to move away from the I-shaped reinforcing rib and into the first molding block through the second connecting rod. Finally, the first slider moves to the initial position and comes into contact with the first molding block.

[0023] When the first molding block subsequently resets, it drives the inclined push rod to move, causing the inclined push block to move into the first molding block. During this process, the top of the T-shaped block will abut against the first slider and be pushed into the second assembly cavity, causing the second spring to be compressed. When the inclined push block moves to abut against the first molding block, the T-shaped block moves to face the slot, and the second spring rebounds, driving the T-shaped block to move and insert into the slot, completing the reset.

[0024] An injection molding mold for a plastic lower guard plate for an automotive A-pillar, comprising an undercut molding mechanism.

[0025] By adopting the above technical solution, the complete injection molding of the plastic lower guard plate of the automobile A-pillar can be achieved.

[0026] The main technical effects of this invention are reflected in the following aspects: 1. In this invention, when the first molding block moves close to the mounting plate, the second power unit drives the first slider to slide out of the first molding block, so that the first slider always abuts against the I-shaped reinforcing rib. When the inclined top block moves, it restricts the undercut from following the inclined top block, thereby preventing the undercut from deforming and being strained. 2. When the first molding block moves away from the assembly part, the inclined top block and the first slider will restrict the assembly part and multiple first reinforcing ribs from following the movement of the first molding block, ensuring that the first molding block can be smoothly separated from the assembly part and the first reinforcing ribs, reducing the probability of the assembly part and the first reinforcing ribs being strained when the first molding block moves. 3. In this invention, the abutment block and the inclined top block, together with the first slider, restrict the assembly part and multiple first reinforcing ribs from moving along with the first molding block. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the inverted molding mechanism and a protective plate body in Embodiment 1.

[0028] Figure 2 yes Figure 1 A schematic diagram of the inverted forming mechanism.

[0029] Figure 3 This is a structural schematic diagram of the inverted forming mechanism from another angle.

[0030] Figure 4 yes Figure 3 A schematic diagram of the inverted forming mechanism after removing the mounting plate and two support legs.

[0031] Figure 5 This is a structural schematic diagram of the inverted forming mechanism from another angle.

[0032] Figure 6 yes Figure 1 A structural diagram of the central guard plate body, mounting plate, two inclined top blocks, and other components.

[0033] Figure 7 yes Figure 6 A structural schematic diagram of the middle component from another angle.

[0034] Figure 8 This is a structural diagram of the mounting plate and a connecting block.

[0035] Figure 9 yes Figure 8 A cross-sectional view of the middle component along line AA.

[0036] Figure 10 This is a schematic diagram of the inverted forming mechanism when the first forming block moves to contact the mounting plate.

[0037] Figure 11 yes Figure 10 A magnified view of a section at point B in the middle.

[0038] Figure 12 This is a schematic diagram of the undercut forming mechanism when the mounting plate moves to the point of contact with the limiting block.

[0039] Figure 13 yes Figure 12 A magnified view of a section at point C.

[0040] Figure 14 This is a schematic diagram of the inverted molding mechanism and a protective plate body in Embodiment 2.

[0041] Figure 15 yes Figure 14 A schematic diagram of the inverted forming mechanism from another angle.

[0042] Figure 16 yes Figure 14 A cross-sectional view of the undercut forming mechanism along line DD.

[0043] Figure 17 yes Figure 16 A magnified view of a section at point E in the middle.

[0044] Figure 18 This is an exploded view of the structure of the inclined block, the T-shaped block, and the second spring.

[0045] Figure 19 This is an exploded view of the structure of the first slider, the first spring, the second connecting rod, and the second slider.

[0046] Figure 20 This is a structural diagram of the protective plate body.

[0047] Figure 21 yes Figure 20 A magnified view of a section at point F.

[0048] Figure 22 This is a structural diagram of the protective plate body from another angle.

[0049] Figure 23 yes Figure 22 A magnified view of a section at point G.

[0050] Reference numerals: 1. Moving template; 11. First slide groove; 12. Mounting plate; 13. Slanted top seat; 14. Slanted top rod; 17. Support leg; 18. Core; 19. Limiting block; 2. First forming block; 21. First forming area; 22. First forming groove; 23. Slanted top block; 231. Second assembly cavity; 24. First slider; 25. First assembly hole; 3. First power unit; 31. Hydraulic cylinder; 32. Connecting block; 321. Protrusion; 4. Second power unit; 41. First connecting rod; 42. Second slider; 43. Second connecting rod; 44. First spring; 45. T-shaped block; 46. Slot; 47. Second spring; 51. Abutment block; 52. Third connecting rod; 6. Guard plate body; 61. Assembly part; 62. First reinforcing rib; 63. Undercut; 64. Snap-fit ​​groove; 65. I-shaped reinforcing rib. Detailed Implementation

[0051] The present invention will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this application can be more easily understood and mastered.

[0052] Reference Figures 1-4 Example 1: This embodiment describes an injection molding mold for a plastic lower A-pillar trim panel for automobiles and its undercut molding mechanism. The mold includes a movable template 1 with two cores 18 for molding the trim panel body 6. The movable template 1 has a first groove 11, within which a first molding block 2 is slidably disposed. A limiting block 19 is fixedly connected to the first groove 11, located on the side of the first molding block 2 away from the cores 18.

[0053] Reference Figure 1 and Figure 2 The first molding block 2 is provided with two first molding areas 21 for molding two assembly parts 61, and the first molding areas 21 are provided with first molding grooves 22 for molding multiple first reinforcing ribs 62. The two first molding areas 21 respectively cooperate with two cores 18 to ensure the smooth molding of the protective plate body 6.

[0054] Reference Figure 4 and Figure 5The moving template 1 is also equipped with two sets of first power units 3, which are used to drive the first molding block 2 to slide. The first power unit 3 includes a hydraulic cylinder 31 fixed on the moving template 1 and a connecting block 32 slidably disposed in the first slide groove 11. The connecting block 32 passes through the limiting block 19, one end of the connecting block 32 is connected to the telescopic shaft of the hydraulic cylinder 31, and the other end of the connecting block 32 is connected to the first molding block 2. When the telescopic shafts of the two hydraulic cylinders 31 extend, they drive the two connecting blocks 32 and the first molding block 2 to move away from the core 18. When the telescopic shafts of the two hydraulic cylinders 31 retract, they drive the two connecting blocks 32 and the first molding block 2 to move back to their original position.

[0055] Reference Figure 3 A mounting plate 12 is slidably disposed within the first groove 11. The mounting plate 12 is located between the first molding block 2 and the limiting block 19. When the first molding block 2 moves away from the assembly part 61, it will abut against the mounting plate 12 and drive the mounting plate 12 to move away from the assembly part 61. Two support legs 17 are fixedly connected to the side of the mounting plate 12 away from the first molding block 2. The ends of the two support legs 17 away from the mounting plate 12 are slidably connected to the limiting block 19.

[0056] Reference Figure 2 , Figure 3 , Figure 6 and Figure 7 Two inclined ejector blocks 23 are slidably disposed within the first molding block 2, located in two molding zones respectively. The inclined ejector blocks 23 are used to form the undercut 63. An inclined ejector seat 13 (a standard part of the mold, its structure will not be described in detail here) is provided on the mounting plate 12. An inclined ejector rod 14 is mounted on the inclined ejector seat 13, extending into the first molding block 2 and connecting to the inclined ejector blocks 23. The inclined ejector rod 14 can slide relative to the first molding block 2. When the first molding block 2 moves towards the mounting plate 12, it presses against the inclined ejector rod 14, driving the inclined ejector rod 14 and the inclined ejector blocks 23 to move, causing the inclined ejector blocks 23 to move out of the snap-fit ​​groove 64. When the inclined ejector blocks 23 move out of the snap-fit ​​groove 64, they always contact the assembly part 61, thereby restricting the assembly part 61 from following the movement of the first molding block 2.

[0057] Reference Figure 3 , Figure 4 , Figure 8 and Figure 9 Both connecting blocks 32 have integrally formed protrusions 321, located on the side of the mounting plate 12 away from the moving template 1. Initially, the two protrusions 321 are in contact with the mounting plate 12. When the first forming block 2 moves towards the mounting plate 12, the two protrusions 321 move away from the mounting plate 12. When the first forming block 2 moves away from the mounting plate 12 (i.e., towards the core 18), the two protrusions 321 will contact the mounting plate 12 and push the mounting plate 12 to its original position.

[0058] Reference Figure 2 , Figure 6 , Figure 7 A first slider 24 is slidably disposed inside the first forming block 2 along its direction of movement. The first slider 24 is used to form the I-shaped reinforcing rib 65. A second power unit 4 is provided on the first forming block 2. The second power unit 4 is used to drive the first slider 24 to slide. When the inclined top block 23 moves out of the snap-fit ​​groove 64, the second power unit 4 drives the first slider 24 to slide out of the first forming block 2, so that the first slider 24 always abuts against the I-shaped reinforcing rib 65, restricting the movement of the inclined top block 23 and causing the inverted buckle 63 to move together.

[0059] Reference Figure 2 , Figure 6 , Figure 7 The second power unit 4 includes a first connecting rod 41 slidably disposed on the first molding block 2, and the sliding direction of the first connecting rod 41 is the same as the sliding direction of the first molding block 2. The two ends of the first connecting rod 41 are fixedly connected to the first slider 24 and the mounting plate 12, respectively. When the first molding block 2 moves closer to the mounting plate 12, the first slider 24 slides out of the first molding block 2.

[0060] Reference Figure 1 , Figure 2 , Figure 6 , Figure 7 The first forming block 2 is also slidably provided with four abutment blocks 51 and four third connecting rods 52 along its direction of movement. The four abutment blocks 51 and the four third connecting rods 52 are symmetrically arranged in pairs on the first forming block 2. The two abutment blocks 51 on the same side are located in the same first forming area 21 and are used to form the same assembly part 61. The two ends of the four third connecting rods 52 are fixedly connected to the four abutment blocks 51 and the mounting plate 12, respectively.

[0061] In this embodiment, the demolding process of assembly part 61 is as follows: Reference Figure 1 , Figure 6 , Figure 10 , Figure 11 First, the extension shafts of the two hydraulic cylinders 31 extend, driving the two connecting blocks 32, the two protrusions 321, and the first forming block 2 to move away from the core 18 and the already formed assembly part 61 (the first forming block 2 moves towards the mounting plate 12). During the movement of the first forming block 2 away from the assembly part 61, the first forming block 2 and the two protrusions 321 move independently, with the two protrusions 321 moving away from the mounting plate 12. During the movement of the first forming block 2 towards the mounting plate 12, the first forming block 2 presses against the inclined push rod 14, causing the inclined push rod 14 to slide on the inclined push seat 13. When the inclined push rod 14 slides, it drives the inclined push block 23 to move, causing the inclined push block 23 to extend out of the first forming block 2 and disengage from the undercut 63, gradually moving out of the snap-fit ​​groove 64.

[0062] Reference Figure 1 , Figure 6 , Figure 10 , Figure 11 During the movement of the first molding block 2 alone, the first slider 24 will not move with the first molding block 2 under the action of the first connecting rod 41. So, relative to the first molding block 2, the first slider 24 will slide out of the first molding block 2 and always contact the I-shaped reinforcing rib 65. The first molding block 2 and the I-shaped reinforcing rib 65 form a natural inverted structure. When the inclined top block 23 moves away from the inverted buckle 63, it restricts the inverted buckle 63 from following the inclined top block 23, thereby preventing the inverted buckle 63 from deforming and being strained.

[0063] Reference Figure 1 , Figure 6 , Figure 10 , Figure 11 Of course, during the movement of the first molding block 2 alone, the abutment block 51 is always in contact with the assembly part 61 under the action of the third connecting rod 52. Therefore, during the movement of the first molding block 2 alone, the abutment block 51, the inclined top block 23, and the first slider 24 together restrict the assembly part 61 and the multiple first reinforcing ribs 62 to move with the first molding block 2.

[0064] Reference Figure 1 , Figure 6 , Figure 10 , Figure 11 When the first molding block 2 moves to contact the mounting plate 12, the inclined push block 23 has already disengaged from the undercut 63. Therefore, when the inclined push block 23 subsequently moves away from the assembly part 61 along with the first molding block 2, the undercut 63 will not hinder its movement. Subsequently, the first molding block 2 continues to move away from the assembly part 61 and pushes the mounting plate 12 to move away from the assembly part 61 together. When the mounting plate 12 moves away from the assembly part 61, it drives the first slider 24, the abutment block 51, and the inclined push rod 14 to move away from the assembly part 61, and releases the undercut 63 structure between the first slider 24 and the I-shaped reinforcing rib 65.

[0065] Reference Figure 12 , Figure 13 When the mounting plate 12 moves to abut against the limiting block 19, the mounting plate 12 and the first forming block 2 stop moving. Then, the guard plate body 6 can be removed from the core 18. After the guard plate body 6 is removed from the moving template 1, the telescopic shafts of the two hydraulic cylinders 31 retract, driving the two connecting blocks 32, the two protrusions 321, and the first forming block 2 to move and reset.

[0066] Reference Figure 1 , Figure 6 , Figures 10-13During the resetting process of the first molding block 2 and the two protrusions 321, the first molding block 2 first slides away from the mounting plate 12. During the resetting process of the first molding block 2, it pushes the inclined push rod 14 to slide relative to the inclined push seat 13, so that the inclined push block 23 moves into the first molding block 2. At the same time, during the resetting process of the first molding block 2, the first slider 24 and the abutment 51 remain stationary. Therefore, when the first molding block 2 is reset, the two will gradually approach the first molding block 2 and enter the first molding block 2.

[0067] Reference Figure 1 , Figure 6 , Figure 10 , Figure 11 When the inclined top block 23, the first slider 24, and the abutment block 51 move to contact the first forming block 2, the two protrusions 321 move to contact the mounting plate 12. Subsequently, the two protrusions 321 continue to move and reset, pushing the mounting plate 12 to move and reset.

[0068] Reference Figure 14 and Figure 15 Example 2: In this example, the second power unit 4 is different from that in Example 1, and the mounting plate 12 is fixedly installed and directly abuts against the limiting block 19.

[0069] Reference Figures 16-19 The first molding block 2 has a first mounting hole 25. The second power unit 4 includes a second slider 42 slidably disposed within the first mounting hole 25, a second connecting rod 43 for connecting the first slider 24 and the second slider 42, and a first spring 44 disposed within the first mounting hole 25. The second slider 42 and the connecting rod are integrally formed. The first spring 44 is sleeved on the second connecting rod 43. The second slider 42 is located on the side of the first slider 24 near the mounting plate 12, and the first spring 44 is located between the first slider 24 and the second slider 42. One end of the first spring 44 abuts against the wall of the first mounting hole 25, and the other end of the first spring 44 abuts against the second slider 42. The first spring 44 always drives the second slider 42 to move toward the mounting plate 12. Without external force, the first slider 24 always abuts against the first molding block 2 under the action of the first spring 44.

[0070] Reference Figure 16 and Figure 17 During machining, the first mounting hole 25 is drilled from the side of the first forming block 2 facing the mounting plate 12. The first mounting hole 25 is connected to the hole on the first forming block 2 for accommodating the inclined push rod 14. In order to prevent assembly interference, during the assembly of the mechanism, the first slider 24, the first spring 44 and the second slider 42 are assembled first, and then the inclined push block 23 and the inclined push rod 14 are assembled.

[0071] Reference Figures 16-19The inclined top block 23 has a second assembly cavity 231. The second power unit 4 also includes a T-shaped block 45 slidably disposed in the second assembly cavity 231, a slot 46 disposed on the second slider 42, and a second spring 47 disposed in the second assembly cavity 231. The larger end of the T-shaped block 45 is called the large end, and the smaller end of the T-shaped block 45 is called the small end. The large end of the T-shaped block 45 is slidably disposed in the second assembly cavity 231, and the small end of the T-shaped block 45 extends out of the inclined top block 23 and is inserted into the slot 46. The second spring 47 is disposed in the second assembly cavity 231, and the second spring 47 is located on the side of the T-shaped block 45 away from the second slider 42. The two ends of the second spring 47 abut against the cavity wall of the second assembly cavity 231 and the T-shaped block 45, respectively, and the second spring 47 restricts the T-shaped block 45 from sliding into the second assembly cavity 231. Without external force, the second spring 47 presses the large end of the T-shaped block 45 against the wall of the second assembly cavity 231 near the first slider 24, and the small end of the T-shaped block 45 is inserted into the slot 46, restricting the movement of the first slider 24 toward the mounting plate 12.

[0072] Reference Figures 16-19 In this embodiment, the demolding process of assembly part 61 is as follows: As the first molding block 2 moves away from the assembly part 61, the inclined push block 23 gradually moves away from the undercut 63. The first slider 24, restrained by the T-shaped block 45, does not follow the movement of the first molding block 2 and remains in contact with the I-shaped reinforcing rib 65. Therefore, the action of the first slider 24 relative to the first molding block 2 is to slide out of the first molding block 2. When the first slider 24 slides out of the first molding block 2, it will drive the second slider 42 to slide within the first assembly hole 25 and press against the first spring 44 via the second connecting rod 43.

[0073] As the inclined top block 23 gradually moves away from the inverted clip 63, it also drives the T-shaped block 45 to gradually move out of the slot 46. Subsequently, when the T-shaped block 45 moves out of the slot 46, the first spring 44 rebounds and drives the second slider 42 to slide towards the mounting plate 12. When the second slider 42 slides, it drives the first slider 24 to move away from the I-shaped reinforcing rib 65 and into the first molding block 2 through the second connecting rod 43. Finally, the first slider 24 moves to the initial position and abuts against the first molding block 2.

[0074] When the first molding block 2 subsequently moves to reset, it drives the inclined push rod 14 to move, causing the inclined push block 23 to move into the first molding block 2. During this process, the small end of the T-shaped block 45 will abut against the first slider 24 and be pushed into the second assembly cavity 231, so that the second spring 47 is compressed. When the inclined push block 23 moves to abut against the first molding block 2, the first molding block 2 also stops moving and resets. At this time, the T-shaped block 45 moves to face the slot 46, and the second spring 47 rebounds to drive the T-shaped block 45 to move and insert into the slot 46, completing the reset.

[0075] Of course, the above are just typical examples of this application. In addition, this application may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed in this application.

Claims

1. A snap-fit ​​molding mechanism for a plastic lower guard plate of an automotive A-pillar, comprising a movable template, characterized in that: The moving template is provided with a first sliding groove, in which a first forming block is slidably disposed. The first forming block is provided with a first forming area for forming an assembly part, and the first forming area is provided with a first forming groove for forming multiple first reinforcing ribs. The moving template is also provided with a first power unit for driving the first forming block to slide. An inclined push block is slidably disposed within the first molding block, the inclined push block being used to form an undercut; a mounting plate is provided within the first groove, the mounting plate is provided with an inclined push seat, the inclined push seat is provided with an inclined push rod, the inclined push rod extending into the first molding block and connecting with the inclined push block; when the first molding block moves toward the mounting plate, the first molding block presses against the inclined push rod, driving the inclined push rod and the inclined push block to move, so that the inclined push block moves out of the snap-fit ​​groove; when the inclined push block moves out of the snap-fit ​​groove, it always abuts against the assembly part, so as to restrict the assembly part from following the movement of the first molding block; A first slider is slidably disposed inside the first molding block. The first slider is used to form an I-shaped reinforcing rib. A second power unit is provided on the first molding block. The second power unit is used to drive the first slider to slide. When the inclined top block moves out of the snap-fit ​​groove, the second power unit drives the first slider to slide out of the first molding block so that the first slider always abuts against the I-shaped reinforcing rib and restricts the undercut from following the movement of the inclined top block. The first power unit includes a hydraulic cylinder mounted on a moving template and a connecting block slidably disposed in a first sliding groove. The connecting block passes through a mounting plate, one end of the connecting block is connected to the telescopic shaft of the hydraulic cylinder, and the other end of the connecting block is connected to a first forming block. The mounting plate is slidably disposed in the first groove. When the first molding block moves away from the assembly part, it will abut against the mounting plate and drive the mounting plate to move away from the assembly part. The connecting block has an integrally formed protrusion. The protrusion is located on the side of the mounting plate away from the moving template. The protrusion is used to push the mounting plate to move and reset. The second power unit includes a first connecting rod slidably disposed on the first molding block. The two ends of the first connecting rod are respectively connected to the first slider and the mounting plate. When the first molding block moves closer to the mounting plate, the first slider slides out of the first molding block. A stop block and a third connecting rod are slidably disposed on the first molding block. The stop block is located in the first molding area and is used to mold the assembly part. The two ends of the third connecting rod are respectively connected to the stop block and the mounting plate.

2. The undercut molding mechanism for a plastic lower protective plate of an automotive A-pillar according to claim 1, characterized in that: The first groove is also provided with a limiting block, which is located on the side of the mounting plate away from the first forming block; two support legs are slidably connected to the limiting block, and both support legs are connected to the mounting plate.

3. The undercut molding mechanism for a plastic lower A-pillar guard plate of an automobile according to claim 1, characterized in that: The first molding block has a first assembly hole. The second power unit includes a second slider slidably disposed in the first assembly hole, a second connecting rod for connecting the first slider and the second slider, a first spring disposed in the first assembly hole, a T-shaped block slidably disposed on the inclined top block, a slot disposed on the second slider, and a second spring disposed on the inclined top block. The first spring is sleeved on the second connecting rod. One end of the first spring abuts against the wall of the first assembly hole, and the other end of the first spring abuts against the second slider. The first spring always drives the second slider to move toward the mounting plate. The inclined top block has a second assembly cavity. One end of the T-shaped block is slidably disposed in the second assembly cavity, and the other end of the T-shaped block extends out of the inclined top block and is inserted into the slot. The second spring is disposed in the second assembly cavity. The second spring is located on the side of the T-shaped block facing away from the second slider. The two ends of the second spring abut against the cavity wall of the second assembly cavity and the T-shaped block, respectively. The second spring restricts the T-shaped block from sliding into the second assembly cavity.

4. A molding die for injection molding a plastic lower guard plate for an automotive A-pillar, characterized in that: Includes the undercut forming mechanism as described in any one of claims 1-3.

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