Variable cavity laminated injection mold equipment for automobile bumper

Abstract

The invention relates to the technical field of injection molds, and discloses deformation cavity laminated injection mold equipment for an automobile bumper, the deformation cavity laminated injection mold equipment comprises a female mold part, the female mold part comprises a female mold plate, the outer surface of the female mold plate is provided with a molding cavity, and the interior of the female mold plate is slidably connected with a guide column. The deformation cavity laminated injection mold equipment for the automobile bumpers can effectively solve the problems that in the prior art, mechanical arms are mostly adopted for blanking, the automobile bumpers subjected to injection molding are large in area, thin and low in strength at high temperature, the contact area of mechanical arm grippers and the bumpers is limited, uniform supporting is difficult to obtain after demolding, and the production efficiency is high. The problems that when a mechanical arm gripper moves, the mechanical arm gripper shakes under the action of inertia and gravity and is prone to distortion and bending, and meanwhile when the mechanical arm gripper grabs the edge position, the edge position is sunken or scratched due to bearing large pressure, and the quality of a finished product is affected are solved.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and specifically to a variable cavity stacked injection mold equipment for automobile bumpers. Background Technology

[0002] Injection molds are core equipment in the plastic molding industry. Working in conjunction with injection molding machines, they inject molten plastic raw materials into a closed cavity, which then cools and solidifies to form a plastic product of a predetermined shape. They are widely used in the production of automotive bumpers. To balance lightweight design and impact resistance, modified polypropylene-based composite materials are commonly used in automotive bumpers. These materials are characterized by their ability to be repeatedly melted and processed with minimal performance loss, and their properties can be restored or even partially improved by adding modifiers. This provides a material basis for the application of recycled plastics in bumper injection molding.

[0003] In existing technologies, robotic arms are mostly used for material unloading. However, due to the large area, thin thickness, and low strength at high temperatures of the injection-molded car bumper, the contact area between the robotic arm gripper and the bumper is limited. It is difficult to obtain uniform support after demolding. When moving, it will sway under the action of inertia and gravity, which can easily cause twisting and bending. At the same time, when the robotic arm gripper grasps the edge, the edge will be dented or scratched due to the large pressure, which will affect the quality of the finished product. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a variable cavity stacked injection mold device for automobile bumpers. This device effectively solves the problems of existing technologies that mostly use robotic arms for material handling. However, due to the large area, thin thickness, and low strength at high temperatures of the injection-molded automobile bumper, the contact area between the robotic arm gripper and the bumper is limited. This results in difficulty in obtaining uniform support after demolding, causing swaying under inertia and gravity during movement, and easily leading to twisting and bending. Furthermore, when the robotic arm grips the edge, the edge may experience dents or scratches due to the significant pressure, affecting the quality of the finished product.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a cavity stack injection molding machine for automobile bumpers, comprising:

[0007] The die part includes a die template, the outer surface of which is provided with a forming cavity, and a guide post is slidably connected inside the die template;

[0008] The punch part includes a pad plate that is slidably connected to the outer surface of the guide post. A punch plate is fixedly connected to the side of the pad plate near the concave plate. A mold core that is adapted to the forming cavity is provided on the side of the punch plate away from the pad plate. A base plate that fits against the outer surface of the guide post is slidably connected to the side of the pad plate away from the punch plate. A support member is provided on the outer surface of the punch plate.

[0009] The mold core includes a fixed protrusion, the outer surface of which is fixedly connected to the outer surface of the mold plate. The mold plate has a sliding groove inside, and a sliding protrusion that fits against the side of the fixed protrusion is slidably connected to the inner wall surface of the sliding groove. The pad has a drive component for retracting the sliding protrusion through a cavity inside it.

[0010] Furthermore, two pads are provided, and the two pads are symmetrically distributed around the convex template. The side of the concave template is rotatably connected to a gear, and the side of the convex template is fixedly connected to a rack that meshes with the outer surface of the gear.

[0011] Furthermore, the groove is connected to the interior of the cavity, and the driving component includes a connecting column fixedly connected to the side of the sliding protrusion near the pad. The end of the connecting column away from the sliding protrusion passes through the protrusion template and extends into the cavity, where it is fixedly connected to an inclined block. A spring is sleeved on the outer surface of the connecting column and connected to the side of the inclined block near the fixed protrusion. A guide rod is slidably connected inside the pad and fixedly connected to the outer surface of the base plate.

[0012] Furthermore, a pin is embedded inside the sliding protrusion, and one end of the pin near the pad is fixedly connected to the inner wall surface of the groove.

[0013] Furthermore, the slide is provided in two parts and symmetrically distributed around the fixed protrusion. The slide is inclined. The outer surface of the inclined block near the fixed protrusion is perpendicular to the axis of the connecting column, and the outer surface of the inclined block away from the fixed protrusion is parallel to the inner wall surface of the cavity.

[0014] Furthermore, the support includes a connecting frame, the outer end of which is rotatably connected to the placement groove formed on the outer surface of the convex template. The connecting frame is rotatably connected to the support frame via a shaft disposed above it, and a torsion spring connected to the inside of the support frame is sleeved on the outer surface of the shaft.

[0015] Furthermore, a connecting rod is fixedly connected to the bottom end of the concave template, a toothed ring is fixedly connected to the outer side of the connecting frame, teeth that mesh with the toothed ring are provided on the upper surface of the connecting rod away from the concave template, and a limiting block that fits against the outer surface of the connecting rod is fixedly connected to the bottom end of the pad.

[0016] Furthermore, the support surface of the support bracket adopts a curved surface design, the support surface of the support bracket is provided with a buffer layer, and the outer surface of the support bracket away from the buffer layer adopts a magnetic design.

[0017] The technical solution provided by this invention has the following advantages compared with the prior art:

[0018] This invention features a concave template, a convex template, and a support component. Traditional blanking often relies on external handling equipment, which can easily cause blank shaking, localized collisions, and damage. This design achieves in-situ buffer support. After mold opening, the support frame unfolds below through the linkage of the toothed ring and the connecting frame, forming a buffer support for the bumper blank. After the blank falls off, the support frame provides buffer support, ensuring stable blanking. Blank receiving and releasing can be completed without the need for additional robotic arms, improving automation and cycle time. The support frame's support surface covers a larger area, resulting in more even weight distribution, reducing the risk of localized overload and deformation. It absorbs energy when the hot and relatively soft blank falls, reducing surface damage from hard impacts. A torsion spring is installed between the support frame and the connecting frame, forming an elastic hinge. The support surface of the support frame has adaptive deformation capabilities. During blanking, the torsion spring provides buffering, absorbing the impact energy of the hot, soft bumper falling, preventing instantaneous deformation, and allowing the support surface to slightly adjust its tilt angle according to weight distribution, achieving multi-point contact support. The double shock absorption of the support frame's buffer layer and torsion springs can reduce the risk of indentation on the bottom of injection molded parts, avoiding the situation where conventional robotic arm grippers may cause dents or scratches at the edges due to excessive pressure when gripping the edge, thus affecting the quality of the finished product. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the mold-closed state according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the mold opening state according to an embodiment of the present invention;

[0022] Figure 3 This is a cross-sectional structural diagram of the mold-closed state according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the separated structure of the base plate, pad plate, protruding template and connecting frame in an embodiment of the present invention;

[0024] Figure 5This is a schematic diagram of the separation structure of the base plate, pad plate, convex template, connecting frame and concave template at another angle in an embodiment of the present invention;

[0025] Figure 6 This is a schematic cross-sectional view of the pad structure according to an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the convex template, fixing protrusion, and sliding groove according to an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the structure of the support member, concave template, and convex template according to an embodiment of the present invention;

[0028] Figure 9 This is a schematic diagram of the separate structure of the connecting frame, torsion spring, and support frame according to an embodiment of the present invention;

[0029] Figure 10 This is a schematic diagram illustrating the state transitions of the connecting frame and the support frame in an embodiment of the present invention.

[0030] The labels in the diagram represent: 1. Die cavity; 11. Die template; 12. Molding cavity; 13. Guide pillar; 14. Gear; 141. Rack; 2. Punch cavity; 21. Backing plate; 211. Cavity; 22. Punch template; 221. Slide groove; 23. Mold core; 231. Fixed protrusion; 232. Sliding protrusion; 2321. Ejector pin; 24. Base plate; 25. Support component; 251. Connecting frame; 252. Support frame; 253. Torsion spring; 254. Connecting rod; 2541. Tooth; 255. Gear ring; 26. Drive component; 261. Connecting pillar; 262. Inclined block; 263. Spring; 264. Guide rod. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] The present invention will be further described below with reference to embodiments.

[0033] Example:

[0034] Please see Figures 1-10 This invention provides a technical solution: a variable cavity stacked injection mold equipment for automobile bumpers, comprising:

[0035] The die part 1 includes a die template 11, a forming cavity 12 is formed on the outer surface of the die template 11, and a guide post 13 is slidably connected inside the die template 11.

[0036] The punch part 2 includes a pad 21 that is slidably connected to the outer surface of the guide post 13. A punch 22 is fixedly connected to the side of the pad 21 near the concave template 11. A mold core 23 that is adapted to the molding cavity 12 is provided on the side of the punch 22 away from the pad 21. A bottom plate 24 that is in contact with the outer surface of the guide post 13 is slidably connected to the side of the pad 21 away from the punch 22. A support member 25 is provided on the outer surface of the punch 22.

[0037] The mold core 23 includes a fixed protrusion 231, the outer surface of which is fixedly connected to the outer surface of the mold plate 22. The mold plate 22 has a groove 221 inside, and a sliding protrusion 232 that fits against the side of the fixed protrusion 231 is slidably connected to the inner wall surface of the groove 221. The pad 21 has a drive member 26 for retracting the sliding protrusion 232 through a cavity 211 inside it.

[0038] There are two pads 21, which are symmetrically distributed around the convex template 22. The side of the concave template 11 is rotatably connected to a gear 14, and the side of the convex template 22 is fixedly connected to a rack 141 that meshes with the outer surface of the gear 14.

[0039] The slide groove 221 is connected to the interior of the cavity 211. The driving component 26 includes a connecting post 261 that is fixedly connected to the side of the sliding protrusion 232 near the pad 21. The end of the connecting post 261 away from the sliding protrusion 232 passes through the protrusion template 22 and extends into the cavity 211 and is fixedly connected to the inclined block 262. The outer surface of the connecting post 261 is fitted with a spring 263 that is connected to the side of the inclined block 262 near the fixed protrusion 231. The pad 21 is slidably connected to a guide rod 264 that is fixedly connected to the outer surface of the base plate 24.

[0040] A pin 2321 is embedded inside the sliding protrusion 232, and one end of the pin 2321 near the pad 21 is fixedly connected to the inner wall surface of the groove 221.

[0041] Two slides 221 are provided and symmetrically distributed with the fixed protrusion 231 as the center. The slides 221 are inclined. The outer surface of the inclined block 262 near the fixed protrusion 231 is perpendicular to the axis of the connecting column 261, and the outer surface of the inclined block 262 away from the fixed protrusion 231 is parallel to the inner wall surface of the cavity 211.

[0042] The support member 25 includes a connecting frame 251. The outer end of the connecting frame 251 is rotatably connected to the placement groove opened on the outer surface of the protruding template 22. The connecting frame 251 is rotatably connected to the support frame 252 by a shaft set above it. A torsion spring 253 connected to the inside of the support frame 252 is sleeved on the outer surface of the shaft.

[0043] A connecting rod 254 is fixedly connected to the bottom end of the concave template 11, a toothed ring 255 is fixedly connected to the outer side of the connecting frame 251, and a tooth 2541 that meshes with the toothed ring 255 is provided on the upper surface of the connecting rod 254 away from the concave template 11. A limiting block that fits against the outer surface of the connecting rod 254 is fixedly connected to the bottom end of the pad 21.

[0044] The support surface of the support bracket 252 is designed with a curved surface and a buffer layer is provided on the support surface of the support bracket 252. The outer surface of the support bracket 252 away from the buffer layer is designed with magnetic force.

[0045] Currently, some automakers have implemented the application of recycled PP materials in non-appearance areas of bumpers, such as inner reinforcing ribs and mounting brackets. Some emerging automakers have improved their modification processes and increased the proportion of recycled materials, which can then be applied to the secondary surfaces of bumpers.

[0046] In practical applications, this injection molding equipment can simultaneously injection mold two car bumpers. It has two punches 2, symmetrically distributed around a die 1. Simultaneously, molding cavities 12 are formed on both sides of the die 11, respectively adapting to the mold cores 23 on both sides to injection mold the car bumper. Guide pillars 13 penetrate the die 11, the backing plate 21, the punches 22, and the base plate 24, and are slidably connected to the outer circumferential surface of the guide pillars 13.

[0047] In the initial state, the punch 2 and the die 1 are in a closed state. Plastic raw material granules with added recycled plastic are injected into the mold through the injection equipment. The injection molding machine injects the molten modified polypropylene-based composite material into the two closed cavities through the main runner and the branch runner respectively. The raw material fills the gap between the molding cavity 12 and the mold core 23.

[0048] In this state, the outer surface of the toothed ring 255 does not mesh with the teeth 2541 on the outer surface of the connecting rod 254, and the outer end of the connecting rod 254 passes through the limiting block, keeping it in a constant horizontal state. The rotating end of the connecting frame 251 is inside the placement groove, and under the gravity of the connecting frame 251 and the support frame 252, the connecting frame 251 is in a vertical state. The outer surface of the base plate 24 is completely in contact with the outer surface of the pad plate 21. At the same time, the outer surface of the base plate 24 is in contact with the side of the inclined block 262 in the cavity 211 away from the concave template 11. The connecting column 261 drives the sliding protrusion 232 to the maximum extension position along the inclined groove 221 of the protruding template 22, which together with the fixed protrusion 231 forms a complete mold core 23. The outer contour of the mold core 23 is in contact with the inner wall of the forming cavity 12 of the concave template 11, forming two symmetrical closed cavities, and the spring 263 is in a compressed state. The guide rod 264 has a larger diameter at the end near the concave template 11, and a smaller diameter at the end that is fixed to the outer surface of the base plate 24. The guide rod 264 is completely inside the base plate 21 due to the influence of the positions of the base plate 24 and the pad 21.

[0049] The mold is kept closed, and cooling water is introduced through the pre-set cooling channels inside the concave mold plate 11 and the convex mold plate 22 to cool the molten material inside the cavity. After the material is completely solidified into a car bumper blank, the mold opening and demolding process begins.

[0050] The process of mold making:

[0051] One of the punches 2 remains stationary, while the injection molding machine drives the other punch 2 and the die 1 to move outward along the guide post 13. During this process, a gear 14 is rotatably connected to the side of the die 11, and two racks 141 are distributed circumferentially on the outer surface of the gear 14. The two racks 141 are fixedly connected to the sides of the two punches 22, respectively. Therefore, when the outer punches 2 and die 1 slide against the outer surface of the guide post 13, the gear 14 and the two racks 141 move relative to each other, and when the gear 14 rotates, the two racks 141 move in opposite directions.

[0052] Through the meshing transmission of gear 14 and two racks 141, regardless of how far the die cavity 1 and the single-sided punch 2 move outward (within the maximum mold opening stroke), the distance between the two punches 22 and the die cavity 11 remains equal and constant. Therefore, the gap thickness of the two cavities (formed by the die cavity 11 and the mold cores 23 on both sides) is always consistent, avoiding uneven bumper wall thickness caused by spacing deviation. At the same time, the forces exerted by the punches 22 on the die cavity 11 are symmetrical, which can prevent the die cavity 1 from tilting due to unilateral force, protecting the fitting accuracy of the guide post 13 and the guide hole. The opening rhythm of the two cavities during the mold opening process is completely consistent, which can ensure that the demolding time of the two bumper blanks is synchronized, avoiding workpiece deformation caused by premature demolding on one side.

[0053] External force drives the punch 2 and die 1 on one side to move along the guide post 13. Correspondingly, the base plate 24 moves away from the pad 21. The squeezing force of the guide rod 264 on the inclined block 262 disappears, the spring 263 recovers its deformation, and pushes the inclined block 262 to slide in the opposite direction along the cavity 211. Through the connecting post 261, the sliding protrusion 232 is driven to retract obliquely inward along the inclined slide groove 221 (the retraction stroke meets the arc demolding requirements of this type of bumper). The outer arc surface of the sliding protrusion 232 separates from the arc surface on both sides of the bumper along the arc tangent direction. While the sliding protrusions 232 on both sides retract towards the base plate 24, they also move and retract towards the fixed protrusion 231 at the same time, avoiding the arc surface scratches caused by traditional hard demolding. The arc area can be demolded without interference by only oblique retraction on both sides.

[0054] When the sliding protrusion 232 retracts along the groove 221, the end of the ejector pin 2321 inside it near the pad 21 is fixedly connected to the inner wall of the groove 221. Therefore, when the sliding protrusion 232 moves, the ejector pin 2321 is fixed relative to the sliding protrusion 232 in the direction closer to the molding cavity 12. The top end of the ejector pin 2321 acts on the inner reinforcing rib area of ​​the bumper blank to help the finished car bumper separate from the outer surface of the sliding protrusion 232.

[0055] The curved area of ​​a car bumper is a typical thin-walled structure. Furthermore, the modified PP material containing recycled material tends to form a slight adhesive force with the outer surface of the mold core 23 after cooling. Traditional demolding of curved areas often uses single axial ejection or multiple sets of lateral ejector pins 2321 forcibly pushing the material out, which can easily lead to bending deformation or root cracking in the thin-walled area due to concentrated local stress. In addition, the curved surface of the bumper (such as the outer arc of the wheel arch) has a small radius of curvature. During axial ejection, the sliding protrusion 232 will generate sliding friction and localized compression with the curved surface. This can result in scratches on the curved surface or permanent indentations due to compression, especially since recycled material has lower strength and a higher indentation rate.

[0056] In this structure, the movement of the sliding protrusion 232 is a compound separation along the arc tangent direction. The sliding protrusion 232 actively moves away from the inner wall of the bumper, directly cutting off the micro-adhesion between the mold core 23 and the blank. With the auxiliary pushing of the ejector pin 2321, the uniformity of the force when the blank separates from the mold core 23 is improved, and the bending deformation is reduced.

[0057] Because the slide groove 221 is inclined, the movement path of the sliding protrusion 232 completely coincides with the tangent of the bumper's curved surface. During the separation process, there is no relative friction between the outer curved surface of the protrusion and the curved surface of the bumper; only parallel separation occurs. The contraction of the fixed protrusion 231 further increases the distance between the protrusion and the inner wall of the bumper, preventing the edge of the protrusion from scraping and hooking with the curved surface during separation. The retraction towards the base plate 24 (moving synchronously with the separation of the guide rod 264 and the inclined block 262) ensures that the protrusion is completely away from the cavity, eliminating the risk of secondary contact. In practical applications, this movement can reduce the scratch rate of the bumper's curved surface and directly reduce the indentation rate to zero, fully meeting the quality requirements of the automotive bumper's exterior surface.

[0058] In the initial stage of mold opening, the teeth 2541 on the upper surface of the connecting rod 254 do not contact the toothed grooves on the outer surface of the toothed ring 255. The connecting frame 251 is not subject to external force and remains in a vertical state, with the support member 25 located below the die cavity 1. As the distance between the die cavity 1 and the punch 2 continues to increase, and the mold core 23 is fully exposed, the teeth 2541 on the upper surface of the connecting rod 254 gradually approach the toothed ring 255. When the die cavity 1 and the punch 2 continue to move, the teeth 2541 on the upper surface of the connecting rod 254 and the toothed ring 255 on the outer side of the connecting frame 251 engage in a relative meshing motion. Taking the support member 25 on the right side as an example, the toothed ring 255 rotates counterclockwise under the drive of the teeth 2541, and drives the connecting frame 251, which is fixedly connected to the side of the toothed ring 255, to rotate counterclockwise.

[0059] As the distance between the die cavity 1 and the punch 2 increases, the teeth 2541 on the upper surface of the connecting rod 254 and the toothed ring 255 move relative to each other, driving the toothed ring 255 on the left side to rotate counterclockwise continuously. When the distance between the die cavity 1 and the punch 2 is at its maximum, the teeth 2541, through the toothed ring 255, drive the connecting frame 251 to rotate between the mold core 23 and the forming cavity 12. The connecting frame 251 is in an upward tilted state, and its outer surface is rotatably connected to the support frame 252, which, under the action of its internal unfolding torsion spring 253, always forms a large angle with the connecting frame 251. At this time, the support frame 252 is in an tilted state, positioned diagonally below and outside the mold core 23, preparing for the finished bumper to be cut.

[0060] The support frame 252 and the connecting frame 251 form an elastic angle through the torsion spring 253. This angle design allows the support frame 252 to naturally unfold to an inclined posture. Its curved support surface is exactly located at the lower side of the outside of the mold core 23, forming a matching support space with the bottom contour of the finished bumper to be demolded on the mold core 23 (at this time, the sliding protrusion 232 is in a retracted state, and the outer surface of the fixed protrusion 231 is in contact with the inner wall of the bumper).

[0061] The process of cutting the bumper:

[0062] The elastic angle formed between the support frame 252 and the connecting frame 251 by the torsion spring 253 provides a cushioning effect when the finished bumper falls and contacts the support frame 252, stabilizing the finished product and preventing it from tilting or falling during the unloading process. When the bumper, softened by high temperature, lands on the support surface, the torsion spring 253 can absorb the impact energy through slight deformation. The cushioning layer of the support surface of the support frame 252 is made of elastic material, which, in conjunction with the torsion spring 253, can prevent bumper deformation or surface scratches caused by hard contact. At the same time, the elastic angle setting allows the support frame 252 to adaptively fine-tune according to the weight distribution of the bumper, ensuring that the support surface fully fits the bottom of the bumper, achieving multi-point uniform support, and further preventing the finished product from deforming due to excessive local stress. This is especially suitable for the unloading protection of large-sized thin-walled bumpers. When the finished product falls onto the support frame 252, the torsion spring 253 absorbs part of the impact force through slight deformation, which not only prevents the rigid connection between the support frame 252 and the connecting frame 251 from being damaged by the impact, but also reduces the surface indentation or deformation of the finished product caused by excessive instantaneous force.

[0063] The punch section 2 is equipped with an ejection structure. Through activation control, multiple ejector pins penetrate the mold core 23 and contact the inner wall surface of the car bumper. The bumper blank falls smoothly under the push of the ejector pins, landing precisely on the unfolded support frame 252 buffer layer. Because the two support components 25 are symmetrically distributed, two bumper blanks can be received simultaneously. The receiving process is seamlessly connected to the demolding action, eliminating the need to wait for the robotic arm to position, thus improving production efficiency. Simultaneously, the large-area support of the support frame 252 prevents the blank from swaying due to inertia and gravity during movement, preventing twisting, bending, and deformation.

[0064] The injection molding machine drives one of the punches 2 and the die 1 to move and reset along the guide post 13 towards the other fixed punch 2. The base plate 24 re-fits the pad plate 21, the guide rod 264 presses the inclined block 262, the spring 263 is compressed, and the connecting post 261 drives the sliding protrusion 232 to reset to the extended state along the slide groove 221. At the same time, the connecting frame 251 rotates under the reverse meshing of the toothed ring 255 and the tooth 2541, and is in a vertical state in the placement groove of the punch plate 22. The outer surface of the support frame 252 away from the buffer layer is magnetically designed. In this position, the outer surface of the support frame 252 is subjected to the magnetic force of the external magnetic attraction device, and rotates about the shaft relative to the vertical connecting frame 251. The angle between the support frame 252 and the connecting frame 251 bracket becomes larger, and the car bumper can slowly slide along the curved surface of the support frame 252 under the action of the inclined surface, and achieve material unloading by its own gravity.

[0065] When the support frame 252 is completely under the mold, the teeth 2541 disengage from the outer surface of the toothed ring 255. The die cavity 1 and the punch 2 are still in the initial stage of mold closing. The mold core 23 is still completely exposed to the external space and has not entered the coverage area of ​​the molding cavity 12. The distance between the die cavity 11 and the punch 22 is relatively large. This ensures that the support 25 is retracted first, and then the die cavity 1 and the punch 2 are fully pushed in to close the mold. On the one hand, after the teeth 2541 disengage from the toothed ring 255, the support 25 is no longer constrained by the transmission of the connecting rod 254 and can be stably maintained in the retracted position under the mold, avoiding collision with the die cavity 11 and the punch 22 during mold closing. On the other hand, the large gap in the initial stage of mold closing provides sufficient space for the retraction action of the support 25. Even if there is a slight deviation in posture of the support 25 during the retraction process, it will not interfere with the mold core 23 or the molding cavity 12. After the support component 25 is fully retracted into place, the die cavity 1 and the punch 2 continue to advance and close the mold. The punch platen 22 drives the mold core 23 to gradually approach the forming cavity 12, finally completing the matching between the cavity 12 and the mold core 23. This eliminates the movement interference between the retraction action of the support component 25 and the mold closing action, ensuring the stability and safety of the mold opening and closing process. The support frame 252 is at the bottom of the mold, the mold equipment returns to its initial state, and the next production cycle begins.

[0066] In summary, this mold injection equipment has the following advantages:

[0067] Advantage 1: The injection mold features two symmetrically arranged punches 2 centered on the cavity 1. Molding cavities 12 are formed on both sides of the cavity 11, allowing for the simultaneous injection molding of two car bumpers. Compared to existing single-cavity molds, this improves production efficiency. Furthermore, the symmetrical arrangement of the punches 2 on both sides reduces the problem of uneven equipment load caused by uneven force distribution during injection molding, extending mold life.

[0068] Advantage 2: Existing recycled material bumper molds require strong ejection to remove recycled material due to the slight adhesion between the recycled material and the mold core 23, resulting in high bending deformation rates in thin-walled arc-shaped areas. This equipment addresses this by using sliding protrusions 232 to obliquely retract along the arc-shaped tangent on both sides of the bumper. During the removal process, the outer arc surface of the sliding protrusion 232 has no relative friction with the arc-shaped surface of the inner wall of the bumper; they separate only in parallel. Simultaneously, the protrusions retract towards the fixed protrusion 231, reducing the distance and avoiding the arc-shaped surface scratches caused by the axial ejection of existing products. Especially addressing the issue of low strength in recycled materials, the oblique retraction of the sliding protrusion 232 has no squeezing effect, meeting the surface quality requirements. Under the action of the inclined block 262 and the inclined groove 221, the sliding protrusion 232 achieves inward and outward retraction along the arc-shaped tangent, forming a frictionless demolding path.

[0069] Advantage 3: Traditional blanking often relies on external handling equipment, which can easily cause blank shaking, localized collisions, and damage. This design achieves in-situ buffer support. After mold opening, the support frame 252 unfolds below through the linkage of the toothed ring 255 and the connecting frame 251, forming a buffer support for the bumper blank; after the blank falls off, the support frame 252 buffers and catches it, ensuring stable blanking. Blank receiving and releasing can be completed without the intervention of an additional robotic arm, improving the degree of automation and cycle time. The support surface of the support frame 252 covers a larger area, and the weight distribution is more uniform, reducing the risk of localized overload and deformation. When the high-temperature and relatively soft bumper blank is dropped, it absorbs energy and reduces surface damage caused by hard impacts.

[0070] Advantage 4: Compared to conventional rigid supports that cannot buffer against deformation or surface dents caused by hot parts, the support frame 252 and connecting frame 251 are connected by a torsion spring 253, forming an elastic hinge. The support surface of the support frame 252 has adaptive deformation capabilities. During the unloading process, the torsion spring 253 provides cushioning, absorbing the impact energy of the hot, soft bumper falling, preventing instantaneous deformation, and allowing the support surface to slightly adjust its tilt angle according to weight distribution, achieving multi-point contact support. Through the dual shock absorption of the support frame 252's buffer layer and the torsion spring 253, the risk of indentation on the bottom of the injection-molded parts can be reduced.

[0071] Advantage 5: The ejector pin 2321 is fixed to the inner wall of the slide groove 221. When the sliding protrusion 232 moves, the ejector pin 2321 remains stationary relative to the cavity, directly acting on the reinforcing rib area to push the blank away. During demolding, the sliding protrusion 232 is first pushed out of the partial contact area on the side by the drive component 26, while the ejector pin 2321 remains fixed. During demolding, the apex of the ejector pin 2321 is located in the structural rigid area of ​​the inner wall of the bumper, avoiding force concentration in weak areas. Compared with the traditional ejector pin 2321 moving with the mold plate as a whole, which is prone to causing penetration or misalignment, this equipment achieves precise force application between the sliding protrusion 232 and the ejector pin 2321, resulting in smoother demolding.

[0072] Advantage 6: In the initial stage of mold closing, the support component 25 first disengages from the gear 2541 and gear ring 255 and is stored under the mold. At this time, the cavity part 1 and the punch part 2 still maintain a large distance (the mold core 23 is fully exposed), leaving sufficient space for the support component 25 to be stored, avoiding component collisions caused by the mold closing before the support component 25 is stored, thus improving operational stability. During the mold closing and opening process, the forces exerted by the punch parts 2 on the cavity part 1 on both sides are always symmetrical, avoiding tilting of the cavity part 1 caused by unilateral force.

[0073] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cavity stacking injection mold equipment for automobile bumpers, characterized in that, include: The die part (1) includes a die template (11), the outer surface of the die template (11) is provided with a forming cavity (12), and the interior of the die template (11) is slidably connected with a guide post (13). The punch part (2) includes a pad (21) that is slidably connected to the outer surface of the guide post (13). A punch (22) is fixedly connected to the side of the pad (21) near the concave template (11). A mold core (23) is provided on the side of the punch (22) away from the pad (21). A base plate (24) that is in contact with the outer surface of the guide post (13) is slidably connected to the side of the pad (21) away from the punch (22). A support member (25) is provided below the punch (22). The mold core (23) includes a fixed protrusion (231), the outer surface of which is fixedly connected to the outer surface of the convex template (22), and a sliding groove (221) is provided inside the convex template (22). A sliding protrusion (232) that fits against the side of the fixed protrusion (231) is slidably connected to the inner wall surface of the sliding groove (221). The pad (21) is provided with a drive member (26) for driving the sliding protrusion (232) to retract through a cavity (211) opened inside it.

2. The cavity stacking injection mold equipment for automobile bumpers according to claim 1, characterized in that: Two pads (21) are provided, and the two pads (21) are symmetrically distributed around the convex template (22). The side of the concave template (11) is rotatably connected to a gear (14), and the side of the convex template (22) is fixedly connected to a rack (141) that meshes with the outer surface of the gear (14).

3. The cavity stacked injection mold equipment for automobile bumpers according to claim 2, characterized in that: The groove (221) is connected to the interior of the cavity (211). The driving component (26) includes a connecting column (261) fixedly connected to the sliding protrusion (232) near the pad (21). The end of the connecting column (261) away from the sliding protrusion (232) passes through the protrusion template (22) and extends into the cavity (211) and is fixedly connected to the inclined block (262). The outer surface of the connecting column (261) is fitted with a spring (263) connected to the side of the inclined block (262) near the fixed protrusion (231). The pad (21) is slidably connected to the guide rod (264) fixedly connected to the outer surface of the base plate (24).

4. The cavity stacked injection mold equipment for automobile bumpers according to claim 3, characterized in that: The sliding protrusion (232) is fitted with a pin (2321), and the end of the pin (2321) near the pad (21) is fixedly connected to the inner wall surface of the groove (221).

5. The cavity stacking injection mold equipment for automobile bumpers according to claim 4, characterized in that: Two grooves (221) are provided and symmetrically distributed with the fixed protrusion (231) as the center. The grooves (221) are inclined. The outer surface of the inclined block (262) near the fixed protrusion (231) is perpendicular to the axis of the connecting column (261). The outer surface of the inclined block (262) away from the fixed protrusion (231) is parallel to the inner wall surface of the cavity (211).

6. The cavity stacked injection mold equipment for automobile bumpers according to claim 2, characterized in that: The support member (25) includes a connecting frame (251), the outer end of which is rotatably connected to the placement groove opened on the outer surface of the protruding template (22). The connecting frame (251) is rotatably connected to the support frame (252) by a shaft set above it. A torsion spring (253) connected to the inside of the support frame (252) is sleeved on the outer surface of the shaft.

7. The cavity stacking injection mold equipment for automobile bumpers according to claim 6, characterized in that: A connecting rod (254) is fixedly connected to the bottom end of the concave template (11), and a toothed ring (255) is fixedly connected to the outer side of the connecting frame (251). The upper surface of the connecting rod (254) away from the concave template (11) is provided with teeth (2541) that mesh with the toothed ring (255).

8. The cavity stacking injection mold equipment for automobile bumpers according to claim 6, characterized in that: The support surface of the support frame (252) is designed with a curved surface, and the support surface of the support frame (252) is provided with a buffer layer.

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