Multi-material composite injection mold for automobile rubber part

Abstract

The invention relates to the technical field of injection molds, and discloses an automobile rubber part multi-material composite injection mold which comprises a workbench, the top of the workbench is fixedly connected with a top plate, the bottom of the top plate is provided with a hydraulic cylinder, the output end of the hydraulic cylinder is fixedly connected with an upper mold, and the top of the workbench is provided with a lower mold. The bottom of the upper mold is attached to the top of the lower mold, an injection molding hole is formed in the top of the upper mold, an exhaust mechanism is arranged at the top of the upper mold and comprises a rotating column, and the rotating column is rotationally connected to the top of the upper mold. Through transmission cooperation of the pull rope, the rack plate and the cylindrical gear, the exhaust nozzle and the injection molding hole can be conveniently and accurately overlapped after injection molding is completed, hot air generated in a mold can be rapidly exhausted through the design, the defect that air holes appear in a rubber part due to gas residues is effectively avoided, the appearance quality and the internal structure integrity of a product are guaranteed, and the production efficiency is improved. And the overall quality of the automobile rubber part is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molds, and particularly to a multi-material composite injection mold for automotive rubber parts. Background Art

[0002] In the field of the automotive industry, rubber parts, as important components of automobiles, are widely used in key parts such as automotive sealing, shock absorption, and buffering. Their quality and performance directly affect the safety, comfort, and reliability of automobiles. With the rapid development of the automotive industry, higher requirements are put forward for the precision, performance, and production efficiency of automotive rubber parts. The multi-material composite injection technology has gradually become the mainstream process for manufacturing automotive rubber parts. This technology can endow rubber parts with multiple functions by injecting multiple rubber materials with different properties in the same mold, meeting the usage requirements of complex working conditions of automobiles.

[0003] Currently, in the structural design of common injection molds for automotive rubber parts, they are mainly composed of basic components such as an upper mold, a lower mold, and an injection system. During the mold closing process, a hydraulic drive method is mostly used to close the upper mold and the lower mold to form an injection cavity. During injection, the material is injected into the cavity through the injection hole. After the rubber material is cured and formed, manual assistance is used for demolding.

[0004] However, in actual production scenarios, there are many problems with existing injection molds for automotive rubber parts. When performing multi-material composite injection, the gases generated by injecting different materials are more complex, and it is easy to form pores and bubbles inside the rubber parts, resulting in uneven product surfaces and decreased strength, affecting the sealing performance of automotive seals or the shock absorption effect of shock absorbers. During the demolding process, the efficiency of manual-assisted demolding is low, and it is easy to cause scratches or deformation on the surface of the rubber parts due to improper operation, unable to meet the demolding requirements of rubber parts with complex shapes, and resulting in incomplete demolding or damage to the product. Therefore, the present invention provides a multi-material composite injection mold for automotive rubber parts to solve the deficiencies existing in the prior art. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a multi-material composite injection mold for automotive rubber parts, which solves the problems mentioned in the above background art.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A multi-material composite injection mold for automotive rubber parts, including a workbench, a top plate is fixedly connected to the top of the workbench, a hydraulic cylinder is installed at the bottom of the top plate, the output end of the hydraulic cylinder is fixedly connected to an upper mold, a lower mold is arranged on the top of the workbench, the bottom of the upper mold is attached to the top of the lower mold, an injection hole is opened at the top of the upper mold, and an exhaust mechanism is arranged at the top of the upper mold.

[0007] Preferably, the exhaust mechanism includes a rotating column which is rotatably connected to the top of the upper mold. A cylindrical gear is fixedly connected to the outside of the rotating column. A round hole is formed in the top of the cylindrical gear, and the aperture of the round hole is the same as that of the injection hole.

[0008] Preferably, an exhaust nozzle is installed on the top of the cylindrical gear, and a one-way valve is arranged inside the exhaust nozzle.

[0009] Preferably, a limiting plate is fixedly connected to the top of the upper mold. A rack plate is slidably connected to the inside of the limiting plate, and the rack plate meshes with the cylindrical gear.

[0010] Preferably, one end of the rack plate is fixedly connected to a connecting plate. Two hanging rings are fixedly connected to the outside of the connecting plate. A pull rope is fixedly connected to the outside of the two hanging rings, and a pull ring is fixedly connected to one end of the pull rope.

[0011] Preferably, a demoulding mechanism is arranged outside the upper mold. The demoulding mechanism includes two fixing plates which are fixedly connected to the outside of the upper mold. A sliding column is fixedly connected to the bottom of the fixing plate, and a limiting disc is fixedly connected to the bottom of the sliding column.

[0012] Preferably, an installation ring is slidably connected to the outside of the sliding column, and an L-shaped movable plate is fixedly connected to the outside of the installation ring.

[0013] Preferably, a fixing column is fixedly connected to the outside of the L-shaped movable plate. A demoulding disc is fixedly connected to the tops of the two fixing columns, and the outside of the demoulding disc is slidably connected to the internal through hole of the lower mold.

[0014] Preferably, a cooling mechanism is installed inside the workbench. The cooling mechanism includes two refrigerators and two blowers. The refrigerators are installed outside the workbench. An S-shaped cooling pipe is fixedly connected to the outside of the refrigerator. The S-shaped cooling pipe is located inside the workbench and at the bottom of the lower mold.

[0015] Preferably, the blowers are installed inside the workbench and are located at the bottom of the S-shaped cooling pipe.

[0016] The present invention provides a multi-material composite injection mold for automotive rubber parts, having the following beneficial effects: 1. Through the transmission cooperation of the pull rope, the rack plate and the cylindrical gear, the present invention can accurately align the exhaust nozzle with the injection hole conveniently after injection molding. This design can quickly discharge the hot gas generated in the mold, effectively avoiding defects such as pores and bubbles in the rubber parts caused by gas residue, ensuring the appearance quality and internal structure integrity of the product, and improving the overall quality of automotive rubber parts.

[0017] 2. During the mold opening process of the present invention, the demolding mechanism gives full play to the advantage of automatic demolding. When the upper mold moves upward, the fixed plate drives the sliding column. Through the contact between the limit disk and the mounting ring, components such as the L-shaped movable plate and the fixed column are linked in an orderly manner. Finally, the rubber part is ejected by the demolding disk. This process does not require additional manual operation, which not only improves the demolding efficiency but also reduces product damage caused by manual intervention, ensuring the complete demolding of the rubber part and enhancing production efficiency and product qualification rate.

[0018] 3. The cooling mechanism of the present invention adopts the design of a refrigerator combined with a blower, effectively avoiding the drawback of local overcooling in the traditional cooling method. The cold air generated by the refrigerator is conducted through the S-shaped cooling pipe and then evenly blown onto the lower mold by the blower, ensuring uniform temperature of the rubber part during the cooling process, making the physical properties of the rubber part stable after molding, ensuring the consistency of product quality, and extending the service life of automotive rubber parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the right three-dimensional view of the present invention; Figure 2 is the left three-dimensional view of the present invention; Figure 3 is the structural schematic diagram of the demolding mechanism of the present invention; Figure 4 is Figure 3 the enlarged view of part A in Figure 5 is the structural schematic diagram of the refrigeration mechanism of the present invention; Figure 6 is the structural schematic diagram of the L-shaped movable plate of the present invention.

[0020] Wherein, 1, workbench; 2, top plate; 3, hydraulic cylinder; 4, upper mold; 5, lower mold; 6, exhaust mechanism; 601, rotating column; 602, round hole; 603, exhaust nozzle; 604, limit plate; 605, rack plate; 606, connecting plate; 607, hanging ring; 608, pull rope; 609, pull ring; 7, demolding mechanism; 701, fixed plate; 702, sliding column; 703, limit disk; 704, mounting ring; 705, L-shaped movable plate; 706, fixed column; 707, demolding disk; 8, cooling mechanism; 801, refrigerator; 802, S-shaped cooling pipe; 803, blower. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to the attached Figure 1 - Attachment Figure 6 , an embodiment of the present invention provides a multi - material composite injection mold for automotive rubber parts, including a workbench 1. The workbench 1 serves as the basic support structure of the entire mold system, firmly carrying other components. Its top is fixedly connected to a top plate 2 by a firm method such as welding. The top plate 2 provides a reliable installation position for a hydraulic cylinder 3. A hydraulic cylinder 3 is installed at the bottom of the top plate 2, and the output end of the hydraulic cylinder 3 is fixedly connected to an upper mold 4 by means such as bolts, capable of precisely controlling the up - and - down movement of the upper mold 4. A lower mold 5 is arranged on the top of the workbench 1. The bottom of the upper mold 4 fits with the top of the lower mold 5, jointly forming a cavity for molding automotive rubber parts. An injection hole is opened at the top of the upper mold 4, and an exhaust mechanism 6 is arranged on the top of the upper mold 4. The exhaust mechanism 6 includes a rotating column 601. The rotating column 601 is installed on the top of the upper mold 4 through a rotating connection structure such as a bearing and can rotate flexibly. A cylindrical gear is fixedly connected to its outer side. A round hole 602 is opened at the top of the cylindrical gear, and the aperture of the round hole 602 is the same as that of the injection hole to ensure smooth gas discharge. An exhaust nozzle 603 is installed at the top of the cylindrical gear. A one - way valve is arranged inside the exhaust nozzle 603, only allowing the hot gas in the mold to be discharged. A limiting plate 604 is fixedly connected to the top of the upper mold 4. The limiting plate 604 provides a stable sliding track for a rack plate 605. The rack plate 605 is slidably connected to the inner side of the limiting plate 604, and the rack plate 605 meshes with the cylindrical gear. One end of the rack plate 605 is fixedly connected to a connecting plate 606. Two hanging rings 607 are fixedly connected to the outer side of the connecting plate 606. A pulling rope 608 is fixedly connected to the outer sides of the two hanging rings 607, and one end of the pulling rope 608 is fixedly connected to a pulling ring 609. A demolding mechanism 7 is arranged on the outer side of the upper mold 4. The demolding mechanism 7 includes two fixing plates 701. The fixing plates 701 are fixedly connected to the outer side of the upper mold 4 by means such as bolts. A sliding column 702 is fixedly connected to the bottom of the fixing plate 701, and a limiting disk 703 is fixedly connected to the bottom of the sliding column 702. An installation ring 704 is slidably connected to the outer side of the sliding column 702. An L - shaped movable plate 705 is fixedly connected to the outer side of the installation ring 704. A fixing column 706 is fixedly connected to the outer side of the L - shaped movable plate 705. The tops of the two fixing columns 706 are fixedly connected to a demolding disk 707, and the outer side of the demolding disk 707 is slidably connected to the internal through - hole of the lower mold 5. A cooling mechanism 8 is installed inside the workbench 1. The cooling mechanism 8 includes two refrigerators 801 and two blowers 803. The refrigerators 801 are installed on the outer side of the workbench 1, and an S - shaped cooling pipe 802 is fixedly connected to the outer side of the refrigerator 801. The S - shaped cooling pipe 802 is located inside the workbench 1 and at the bottom of the lower mold 5. The blowers 803 are installed inside the workbench 1 and at the bottom of the S - shaped cooling pipe 802.

[0023] Specifically, first, start the hydraulic cylinder 3. Its output end pushes the upper mold 4 downward to make the bottom of the upper mold 4 fit precisely with the top of the lower mold 5, completing the upper and lower mold closing. This action ensures the sealing of the mold cavity and provides a stable space for the subsequent injection molding process. After the mold closing is completed, inject materials through the round hole 602. The materials enter the mold cavity through the injection hole. At this time, the precise alignment of the round hole 602 and the injection hole ensures that the materials can flow smoothly and unobstructed into the cavity, laying the foundation for the formation of rubber parts. After the material injection is completed, pull the pull ring 609. The movement of the pull ring 609 transmits the pulling force through the pull rope 608. The pull rope 608 pulls the connecting plate 606, and then drives the rack plate 605 to slide inside the limiting plate 604. Since the rack plate 605 meshes with the cylindrical gear, the movement of the rack plate 605 causes the cylindrical gear to rotate. As the cylindrical gear rotates, the exhaust nozzle 603 gradually coincides with the position of the injection hole. When the exhaust nozzle 603 completely coincides with the injection hole, the hot air generated inside the mold cavity during the injection molding process will be discharged outside the mold through the exhaust nozzle 603. This exhaust process is crucial. It effectively avoids defects such as air holes in rubber parts such as tires after molding, greatly improving the quality and performance of the products. After the rubber part is formed and the exhaust is completed, start the hydraulic cylinder 3 again. This time, the hydraulic cylinder 3 drives the upper mold 4 to move upward. The upward movement of the upper mold 4 causes the fixing plate 701 fixed outside the upper mold 4 to move upward synchronously. The fixing plate 701 then drives the sliding column 702 to move upward. When the limiting disk 703 at the bottom of the sliding column 702 moves upward to contact the mounting ring 704, the limiting disk 703 pushes the mounting ring 704 to slide upward along the sliding column 702. The upward movement of the mounting ring 704 drives the L-shaped movable plate 705 to move upward, and the L-shaped movable plate 705 further causes the fixed column 706 to move upward. Finally, the demolding disk 707 connected to the tops of the two fixed columns 706 moves upward. The upward movement of the demolding disk 707 can precisely lift the rubber parts such as tires in the lower mold 5, realizing quick demolding. This demolding method is not only efficient but also can avoid damaging the rubber parts during the demolding process, ensuring the integrity of the products. During the injection molding cooling stage, start the cooler 801. After the cooler 801 starts working, it cools through the S-shaped cooling pipe 802 fixedly connected to the outside, transferring the low temperature to the inside of the workbench 1, especially the bottom of the lower mold 5. At the same time, start the fan 803. The fan 803 evenly blows the cold air around the S-shaped cooling pipe 802 onto the lower mold 5. This auxiliary cooling method of blowing cold air onto the lower mold 5 by the fan 803 can comprehensively and evenly cool the lower mold 5 and the rubber parts inside. Compared with the cooling method in which the traditional cooling structure is in direct contact with the lower mold 5, the cooling method of this embodiment avoids the occurrence of local overcooling phenomena, ensures the temperature uniformity of the rubber parts during the cooling process, and thus improves the forming quality and physical properties of the rubber parts.

[0024] Working principle: First, start the hydraulic cylinder 3 to drive the upper mold 4 to descend for upper and lower mold clamping. Then, inject materials through the round hole 602. After completion, pull the pull ring 609 so that the pull rope 608 drives the rack plate 605 to move, causing the cylindrical gear to rotate, and making the exhaust nozzle 603 coincide with the injection hole. In this way, the hot air in the mold will be discharged from the exhaust nozzle 603 to avoid air holes in the formed tire. Then, start the hydraulic cylinder 3 to drive the upper mold 4 to move upward, so that the fixed plate 701 drives the sliding column 702 to move. When the limit disk 703 moves upward and contacts the mounting ring 704, it will drive the L-shaped movable plate 705 to move upward, and further drive the two fixed columns 706 to drive the demolding disk 707 to move upward, so as to jack up the tire in the lower mold 5 for quick demolding. And during injection molding and cooling, the cooler 801 can be started to make the S-shaped cooling pipe 802 refrigerate, and then the fan 803 is started to blow cold air to the lower mold 5 for auxiliary refrigeration, avoiding the situation of local overcooling caused by the direct structure of the refrigeration structure and the lower mold 5.

[0025] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automotive rubber multi-material composite injection mold, comprising a workbench (1), characterized in that, A top plate (2) is fixedly connected to the top of the workbench (1). A hydraulic cylinder (3) is installed at the bottom of the top plate (2). The output end of the hydraulic cylinder (3) is fixedly connected to an upper mold (4). A lower mold (5) is arranged on the top of the workbench (1). The bottom of the upper mold (4) is in contact with the top of the lower mold (5). An injection hole is formed in the top of the upper mold (4), and an exhaust mechanism (6) is arranged on the top of the upper mold (4).

2. The multi-material composite injection mold for automotive rubber parts according to claim 1, wherein, The exhaust mechanism (6) includes a rotating column (601). The rotating column (601) is rotatably connected to the top of the upper mold (4). A cylindrical gear is fixedly connected to the outer side of the rotating column (601). A round hole (602) is formed in the top of the cylindrical gear. The aperture of the round hole (602) is the same as that of the injection hole.

3. The multi-material composite injection mold for automotive rubber parts according to claim 2, wherein, An exhaust nozzle (603) is installed at the top of the cylindrical gear. A check valve is arranged inside the exhaust nozzle (603).

4. The multi-material composite injection mold for automotive rubber parts according to claim 3, characterized in that, A limit plate (604) is fixedly connected to the top of the upper mold (4). A rack plate (605) is slidably connected to the inner side of the limit plate (604). The rack plate (605) meshes with the cylindrical gear.

5. The multi-material composite injection mold for automotive rubber parts according to claim 4, characterized in that, One end of the rack plate (605) is fixedly connected to a connecting plate (606). Two hanging rings (607) are fixedly connected to the outer side of the connecting plate (606). A pull rope (608) is fixedly connected to the outer sides of the two hanging rings (607). One end of the pull rope (608) is fixedly connected to a pull ring (609).

6. The multi-material composite injection mold for automotive rubber parts according to claim 1, wherein A demolding mechanism (7) is arranged on the outer side of the upper mold (4). The demolding mechanism (7) includes two fixing plates (701). The fixing plates (701) are fixedly connected to the outer side of the upper mold (4). A sliding column (702) is fixedly connected to the bottom of the fixing plate (701). A limit disk (703) is fixedly connected to the bottom of the sliding column (702).

7. The multi-material composite injection mold for automotive rubber parts according to claim 6, wherein An installation ring (704) is slidably connected to the outer side of the sliding column (702). An L-shaped movable plate (705) is fixedly connected to the outer side of the installation ring (704).

8. The multi-material composite injection mold for automotive rubber parts according to claim 7, characterized in that, A fixing column (706) is fixedly connected to the outer side of the L-shaped movable plate (705). The tops of the two fixing columns (706) are fixedly connected to a demolding disk (707). The outer side of the demolding disk (707) is slidably connected to the inner through hole of the lower mold (5).

9. The multi-material composite injection mold for automotive rubber parts according to claim 1, characterized in that, A cooling mechanism (8) is installed inside the workbench (1). The cooling mechanism (8) includes two refrigerators (801) and two blowers (803). The refrigerators (801) are installed on the outer side of the workbench (1). An S-shaped cooling pipe (802) is fixedly connected to the outer side of the refrigerator (801). The S-shaped cooling pipe (802) is located inside the workbench (1) and at the bottom of the lower mold (5).

10. A multi-material composite injection mold for automotive rubber parts according to claim 9, characterized in that, The blowers (803) are installed inside the workbench (1) and at the bottom of the S-shaped cooling pipe (802).

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