Noise reduction type automobile stamping die

Abstract

The utility model relates to the technical field of stamping dies, in particular to a noise reduction type automobile stamping die and a control method.The noise reduction type automobile stamping die comprises a base, a die table is fixedly installed above the base, a die groove is formed in the upper end of the die table, a channel is formed in the lower end of the die table, and first air cylinders symmetrically distributed along the base are arranged in the channel; the lower end of the first air cylinder is fixed to the surface of the base through a screw, and a first piston rod for stretching is arranged in the first air cylinder. According to the scheme, wide-frequency-band noise control is achieved through the design of the five-layer composite sound insulation cover, the core innovation is that the synergistic effect of the array type rubber sound insulation columns and layered materials is achieved, the hollow structures of the sound insulation columns are combined with the rubber damping characteristic, 500-2000 Hz high-frequency noise can be attenuated in a targeted mode, and the impedance gradient design of the polyurethane foam reinforcing layer and the sound insulation cotton layer can achieve the purpose of noise reduction. And the die adopts a two-way limiting mechanism and a double-cylinder driving design, so that the accurate matching of a die head and a die groove is ensured, and the repeated positioning accuracy of stamping is high.

Description

Technical Field

[0001] This utility model relates to the field of stamping die technology, and in particular to a noise-reducing automotive stamping die and its control method. Background Technology

[0002] Automotive stamping dies are molds used in the automobile manufacturing process, primarily for stamping sheet metal into parts of various shapes. These dies are typically made of high-strength steel, possessing excellent wear resistance and impact resistance. During use, automotive stamping dies can stamp sheet metal into predetermined shapes and sizes, thereby manufacturing various automotive parts, such as car bodies, doors, and roofs.

[0003] A search revealed a noise-reducing automotive stamping die according to the authorization announcement number "CN222153530U". The die includes a lower die, an upper die fitted onto the upper surface of the lower die, and a noise-reducing structure fixedly installed on the lower surface of the upper die. The upper die includes insert holes, a top plate, a first base, and a die core. The top plate has four sets of insert holes at its four corners. The first base is fixedly installed on the lower surface of the top plate, and the die core is fixedly installed on the lower surface of the first base. The lower die includes a die core, a hydraulic rod, a first insert groove, a second insert groove, a second base, a bottom plate, a cylinder, a third insert groove, and limiting rods. The bottom plate has four sets of limiting rods fixedly installed at its four corners. The third insert groove is located in the middle of the top surface of the bottom plate. This noise-reducing automotive stamping die can reduce noise during stamping and allows for rapid demolding.

[0004] Currently, the stamping process for automobiles involves the processing of various sheet metal parts and the housing of equipment. During stamping, when the metal sheet is deformed by the pressure of the mold, a contact noise, similar to a hissing sound, is generated between it and the mold. This sound can cause discomfort to the human senses. If workers hear this noise continuously during processing, it can cause certain damage to their ears and senses. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned shortcomings in the existing technology by proposing a noise-reducing automotive stamping die and its control method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a noise-reducing automotive stamping die, including a base, a die platform fixedly installed on the top of the base, a die groove opened at the upper end of the die platform, a channel provided at the lower end of the die platform, a cylinder 1 symmetrically distributed along the base inside the channel, the lower end of the cylinder 1 being fixed to the surface of the base by screws, and a piston rod 1 for extension and retraction inside the cylinder 1.

[0007] A top block is fixedly installed at the end of the piston rod, and a through hole is provided at the bottom of the mold groove to penetrate the mold table. Both the piston rod and the top block are provided through the through hole.

[0008] A support frame is fixedly installed on the top of the base. The support frame has a U-shaped structure. A second cylinder is symmetrically fixed through the upper end of the support frame along both sides. The second cylinder has a piston rod for extension and retraction inside. A mold head is fixedly installed at the end of the piston rod distributed along both sides. The mold head fits into the mold groove.

[0009] In detail, the inner wall of the support frame is provided with limit grooves on both sides, and the two ends of the mold head are fixed with limit blocks. The surface of the limit blocks is slidably and tightly attached to the inside of the limit groove.

[0010] In detail, the base is covered with a soundproof cover, and a doorway is opened on one side of the soundproof cover.

[0011] In detail, the soundproof cover is located on one side of the doorway and covers a door panel. The door panel and the soundproof cover are hinged together by door hinges. A viewing hole is provided on the surface of the door panel, and a tempered glass plate is embedded and fixed inside the viewing hole.

[0012] In detail, the soundproof cover includes a central layer, soundproof columns, a noise reduction layer, a sound insulation reinforcement layer, and an outer layer in sequence. Several soundproof columns are provided and penetrate through the central layer. Noise reduction layers are bonded to both sides of the central layer with resin adhesive. A sound insulation reinforcement layer is bonded to the other side of the noise reduction layer with resin adhesive. The outer layer is bonded to the outside of the sound insulation reinforcement layer with resin adhesive.

[0013] In detail, the core layer is made of wood fiberboard material and has a thickness of not less than 3mm.

[0014] In detail, the soundproof column is a cylindrical structure made of rubber material, and the interior of the soundproof column 2002 is hollow.

[0015] In detail, the noise reduction layer is made of sound-absorbing cotton material and has a thickness of 2-4mm.

[0016] In detail, the sound insulation reinforcement layer is made of polyurethane foam board material with a thickness of 8-12mm.

[0017] In detail, the outer layer is made of stainless steel and has a thickness of 1-3 mm.

[0018] The design scheme proposed in this utility model has the following beneficial effects in application:

[0019] 1. This solution achieves wide-band noise control through a five-layer composite soundproof enclosure design. The core innovation lies in the synergistic effect of arrayed rubber soundproof columns and layered materials. The hollow structure of the soundproof columns, combined with the damping characteristics of rubber, can specifically attenuate high-frequency noise of 500-2000Hz. The impedance gradient design of the polyurethane foam reinforcement layer and the soundproof cotton layer effectively suppresses the transmission of mid- and low-frequency sound waves.

[0020] 2. As described in 1, the mold adopts a two-way limiting mechanism and a dual-cylinder drive design to ensure precise matching between the mold head and the mold slot, resulting in high stamping repeatability and positioning accuracy. The ejection mechanism achieves non-destructive demolding by driving the ejector block with a cylinder, avoiding workpiece deformation caused by traditional manual prying. The soundproof cover is equipped with a double-layer tempered glass viewing window, which not only meets the needs of real-time observation but also maintains local sound insulation performance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a front view of the stamping structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the interior of the mold platform of this utility model;

[0024] Figure 4 This is an enlarged schematic diagram of point A in this utility model;

[0025] Figure 5 This is a schematic diagram of the interior side of the soundproof cover of this utility model;

[0026] Figure 6 This is a schematic diagram of the composition of the soundproof cover of this utility model;

[0027] Figure 7 This is a schematic diagram of the cross-section of the soundproof column of this utility model.

[0028] In the diagram: 1. Base; 11. Mold table; 12. Mold groove; 13. Channel; 14. Cylinder 1; 15. Top block; 16. Through hole; 17. Support frame; 18. Cylinder 2; 19. Mold head; 1001. Limiting groove; 1002. Limiting block; 2. Soundproof cover; 21. Doorway; 22. Door panel; 23. Peephole; 24. Tempered glass panel; 2001. Middle layer; 2002. Soundproof column; 2003. Noise reduction layer; 2004. Soundproof reinforcement layer; 2005. Outer layer. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] Example 1

[0031] Reference Figures 1-7 A noise-reducing automotive stamping die includes a base 1, a die table 11 fixedly installed on the top of the base 1, a die groove 12 opened at the upper end of the die table 11, a channel 13 provided at the lower end of the die table 11, and cylinders 14 symmetrically distributed along the base 1 inside the channel 13. The lower end of the cylinders 14 is fixed to the surface of the base 1 by screws, and a piston rod for extension and retraction is provided inside the cylinders 14. The channel 13 facilitates the installation of cylinders 14.

[0032] A top block 15 is fixedly installed at the end of the piston rod 1. A through hole 16 is provided at the bottom of the mold groove 12, which passes through the mold table 11. Both the piston rod 1 and the top block 15 are provided through the through hole 16. The mold groove 12 can store the base plate to be stamped. The mold groove 12 and the mold head 19 are non-standard structures and can be set according to the actual product shape. The through hole 16 facilitates the passage of the push component. After stamping, the product is ejected from the mold groove 12.

[0033] A support frame 17 is fixedly installed on the top of the base 1. The support frame 17 has a U-shaped structure. A second cylinder 18 is symmetrically fixed through the upper end of the support frame 17 on both sides. The second cylinder 18 has a piston rod 2 for extension and retraction inside. A mold head 19 is fixedly installed at the end of the piston rod 2 distributed on both sides. The mold head 19 is fitted with the mold groove 12. During processing, the base plate is placed into the mold groove 12. Then, the piston rod 2 of the second cylinder 18 extends, causing the mold head 19 to move downward and fit into the mold groove 12, thereby stamping the base plate. After stamping, the piston rod 1 of the first cylinder 14 extends, causing the top block 15 to push the formed product out of the mold groove 12 through the through hole 16.

[0034] It should be further noted that limit grooves 1001 are provided on both sides of the inner wall of the support frame 17, and limit blocks 1002 are fixed at both ends of the mold head 19. The surface of the limit block 1002 is slidably attached to the inside of the limit groove 1001. By sliding the limit block 1002 on the inside of the limit groove 1001, the upper and lower paths of the mold head 19 can be stabilized during movement.

[0035] It should be further explained that the base 1 is covered with a soundproof cover 2, and a doorway 21 is opened on one side of the soundproof cover 2. The soundproof cover 2 can reduce the noise generated during the stamping of the product, so as to avoid harming the human senses and ears. The doorway 21 can facilitate entering and exiting the soundproof cover 2 to retrieve items.

[0036] It should be further explained that the soundproof cover 2 is located on one side of the doorway 21 and is covered by a door panel 22. The door panel 22 and the soundproof cover 2 are hinged together by door hinges. A viewing hole 23 is provided on the surface of the door panel 22. A tempered glass plate 24 is embedded and fixed inside the viewing hole 23. The viewing hole 23 and the tempered glass plate 24 can facilitate the observation of the processing. The tempered glass plate 24 is provided with two layers and a gap between the two layers to ensure the sound insulation effect of the viewing hole 23 area.

[0037] It should be further explained that the soundproof enclosure 2 comprises, in sequence, a central layer 2001, soundproof columns 2002, a noise reduction layer 2003, a sound insulation reinforcement layer 2004, and an outer layer 2005. Several soundproof columns 2002 are provided and penetrate through the central layer 2001. The noise reduction layer 2003 is bonded to both sides of the central layer 2001 with resin adhesive. The sound insulation reinforcement layer 2004 is bonded to the other side of the noise reduction layer 2003 with resin adhesive. The outer layer 2005 is bonded to the outside of the sound insulation reinforcement layer 2004 with resin adhesive. The soundproof enclosure 2 adopts a five-layer composite structure design. The array-like distribution of the sound insulation columns 2002 is the core innovation. Its design, which runs through the central layer, can effectively disperse sound wave energy and block the straight-line propagation path of sound. The noise reduction layer 2003 is symmetrically bonded to both sides of the central layer with resin adhesive to form a double sound absorption barrier. The sound insulation reinforcement layer 2004 further suppresses mid-to-low frequency noise through high-density materials. The outermost layer 2005 not only provides structural protection, but its metallic properties can also reflect residual sound waves. This layered and collaborative design makes the soundproof enclosure perform well in wide-band noise control, especially suitable for high-decibel environments in industrial equipment.

[0038] It should be further noted that the core layer 2001 is made of wood fiberboard and has a thickness of not less than 3mm. The core layer 2001 uses wood fiberboard as the base material, and its thickness of not less than 3mm ensures the structural rigidity and basic sound insulation. Wood fiberboard has a natural porous structure, which can dissipate some high-frequency sound energy through fiber vibration. At the same time, its environmental protection characteristics meet modern industrial standards.

[0039] It should be further noted that the soundproof column 2002 is a cylindrical structure made of rubber. The interior of the soundproof column 2002 is hollow. The hollow structure of the cylindrical rubber soundproof column 2002 is the key to its noise reduction. The high damping characteristics of the rubber material can effectively absorb the sound energy of structural vibration, while the hollow design attenuates noise in specific frequency bands through the Helmholtz resonance principle. Experimental data shows that the insertion loss of a cylindrical array with a diameter of 6-8mm can reach 12dB for noise in the 500-2000Hz range.

[0040] It should be further noted that the noise reduction layer 2003 is made of sound insulation cotton material and has a thickness of 2-4mm. The sound insulation cotton noise reduction layer 2003 achieves broadband sound absorption through a three-stage process: the surface micropores dissipate high-frequency sound waves through viscous dissipation, the internal interwoven fibers form a labyrinthine channel to extend the sound wave propagation path, and the moderate thickness ensures effective capture of mid-frequency sound.

[0041] It should be further noted that the sound insulation reinforcement layer 2004 is made of polyurethane foam board material with a thickness of 8-12mm. The sound insulation reinforcement layer 2004, which is composed of polyurethane foam board, has a unique blocking effect on low-frequency sound waves due to its closed-cell structure. The sound transmission loss of this material in the 100-500Hz frequency band is 15% higher than that of mineral wool board of the same thickness. Its elastic modulus forms an impedance gradient with the noise reduction layer, which effectively suppresses interlayer sound reflection.

[0042] It should be further noted that the outer layer 2005 is made of stainless steel and is 1-3mm thick. The outer layer 2005 has good compressive strength, which can ensure the structural stability of the soundproof cover 2.

[0043] In practice

[0044] This solution completes stamping by cooperating the mold head 19 and the mold groove 12. First, the base plate to be processed is placed in the mold groove 12. The shape of the mold groove can be customized according to product requirements to ensure forming accuracy. After starting the cylinder 18, the piston rod pushes the mold head 19 downward. The mold head and the mold groove 12 fit precisely and apply pressure to the plate to deform it into a preset shape. To ensure the stability of the mold head during the stamping process, the limiting block 1002 slides in the limiting groove 1001 to prevent displacement. After the stamping is completed, the piston rod of the cylinder 14 pushes the top block 15 through the through hole 16 to eject the formed part from the mold groove, realizing automated demolding. This process is achieved by the linkage of two cylinders, which not only ensures stamping accuracy but also improves production efficiency. At the same time, the design of the ejection mechanism avoids mold damage that may be caused by manual removal.

[0045] The soundproof enclosure 2 adopts a five-layer composite structure to suppress stamping noise over a wide frequency range. Its core layer 2001 is made of wood fiberboard, which absorbs high-frequency sound waves through its porous structure. The rubber sound insulation column 2002 running through it uses a hollow design to induce Helmholtz resonance, specifically attenuating harsh noise in the 500-2000Hz range. The sound insulation cotton in the noise reduction layer 2003 extends the sound wave path through fiber interweaving, consuming mid-frequency energy. The polyurethane foam board in the sound insulation reinforcement layer 2004 blocks low-frequency vibrations with its high-density closed-cell structure. The outermost stainless steel plate 2005 reflects residual sound waves and enhances structural strength. The layers are bonded together with resin adhesive to form a gradual impedance change, reducing sound wave reflection. Experiments show that this design reduces the insertion loss of high-frequency noise by 12dB, and the overall noise reduction effect is better than that of traditional single-layer soundproof enclosures.

[0046] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A noise-reducing automotive stamping die, comprising a base (1), characterized in that: A mold platform (11) is fixedly installed above the base (1). A mold groove (12) is opened at the upper end of the mold platform (11). A channel (13) is provided at the lower end of the mold platform (11). A cylinder (14) is symmetrically distributed along the base (1) inside the channel (13). The lower end of the cylinder (14) is fixed to the surface of the base (1) by screws. A piston rod for extension and retraction is provided inside the cylinder (14). A top block (15) is fixedly installed at the end of the piston rod, and a through hole (16) is provided at the bottom of the mold groove (12) to pass through the mold table (11). Both the piston rod and the top block (15) are provided through the through hole (16). A support frame (17) is fixedly installed above the base (1). The support frame (17) is a U-shaped structure. A cylinder (18) is symmetrically fixed through the upper end of the support frame (17) on both sides. A piston rod (2) for telescopic extension is provided inside the cylinder (18). A mold head (19) is fixedly installed at the end of the piston rod (2) distributed on both sides. The mold head (19) fits into the mold groove (12).

2. The noise-reducing automotive stamping die according to claim 1, characterized in that: The inner walls of the support frame (17) are provided with limit grooves (1001) on both sides, and the mold head (19) is fixed with limit blocks (1002) at both ends. The surface of the limit block (1002) is slidably attached to the inside of the limit groove (1001).

3. The noise-reducing automotive stamping die according to claim 2, characterized in that: The base (1) is covered with a soundproof cover (2), and a doorway (21) is opened on one side of the soundproof cover (2).

4. The noise-reducing automotive stamping die according to claim 3, characterized in that: The soundproof cover (2) is located on one side of the doorway (21) and is covered by a door panel (22). The door panel (22) and the soundproof cover (2) are hinged together by a door hinge. A viewing hole (23) is provided on the surface of the door panel (22), and a tempered glass plate (24) is embedded and fixed inside the viewing hole (23).

5. A noise-reducing automotive stamping die according to claim 4, characterized in that: The soundproof cover (2) includes, in sequence, a central layer (2001), soundproof columns (2002), a noise reduction layer (2003), a sound insulation reinforcement layer (2004), and an outer layer (2005). Several soundproof columns (2002) are provided and penetrate through the central layer (2001). The noise reduction layer (2003) is bonded to both sides of the central layer (2001) with resin adhesive. The sound insulation reinforcement layer (2004) is bonded to the other side of the noise reduction layer (2003) with resin adhesive. The outer layer (2005) is fixed to the outside of the sound insulation reinforcement layer (2004) with resin adhesive.

6. A noise-reducing automotive stamping die according to claim 5, characterized in that: The central layer (2001) is made of wood fiberboard material and has a thickness of not less than 3 mm.

7. A noise-reducing automotive stamping die according to claim 6, characterized in that: The soundproof column (2002) is a cylindrical structure made of rubber material, and the interior of the soundproof column (2002) is hollow.

8. A noise-reducing automotive stamping die according to claim 7, characterized in that: The noise reduction layer (2003) is made of sound-absorbing cotton material and has a thickness of 2-4 mm.

9. A noise-reducing automotive stamping die according to claim 7, characterized in that: The sound insulation reinforcement layer (2004) is made of polyurethane foam board material and has a thickness of 8-12mm.

10. A noise-reducing automotive stamping die according to claim 7, characterized in that: The outer layer (2005) is made of stainless steel and has a thickness of 1-3 mm.

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