Die for vulcanizing double-sided framework silica gel shock pad

Abstract

The utility model relates to the field of double-sided framework silica gel shock pad production equipment, and discloses a mold for vulcanizing a double-sided framework silica gel shock pad, which comprises an upper mold and a lower mold, the upper mold and the lower mold are respectively provided with a plurality of corresponding upper cavities and lower cavities, and the upper cavities and the lower cavities form sealed vulcanized cavities when closed; the magnetic adsorption assembly is arranged in the top area of the upper mold, the magnetic adsorption assembly comprises a magnet, the magnet and the upper cavity are arranged in a staggered mode in the vertical direction, and the magnet is isolated from the upper cavity; according to the mold, through the innovative design of the magnetic adsorption assembly, the top area of the upper mold is provided with the magnet which is vertically staggered with the upper cavity and is completely isolated from the upper cavity, and the upper framework of the silica gel shock pad is indirectly adsorbed through magnetic force; the problems that in a traditional magnet fixing mode, falling, fragmentation and glue failure exist, and appearance defects exist in the double-face framework shock pad after injection molding are effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of vulcanization mold technology for double-sided skeleton silicone shock-absorbing pads, and more specifically, to a mold for vulcanizing double-sided skeleton silicone shock-absorbing pads. Background Technology

[0002] In the field of rubber product vulcanization molding, silicone shock-absorbing pads with double-sided skeleton structures face significant technical challenges in mold positioning and molding processes due to their special shock-absorbing performance requirements. In existing technologies, using magnetic positioning devices to solve the skeleton positioning problem has become a common practice in the industry.

[0003] For example, Chinese utility model patent CN203004137U discloses a mold for embedding a magnet into an upper template to attract and position a skeleton. The mold includes an upper template, a lower template, and a skeleton, as well as a first magnet and a second magnet. The rectangular upper template has two through holes, in which the first magnet and the second magnet are respectively installed. The first magnet and the second magnet are symmetrically distributed about the center of the upper template. The lower surface of the upper template has a circular cavity, within which the skeleton is placed. By using the first magnet and the second magnet to attract and position the skeleton, the upper template can easily and quickly fill the skeleton, achieving precise positioning and high efficiency, greatly improving operational efficiency and product qualification rate.

[0004] According to the appendix of the above plan Figure 1 It is known that a hole is made on the top surface of the mold cavity, and a magnet is installed there. Due to the magnetic force of the magnet, when the product is removed after injection molding, the magnet will be carried out with it. If the magnet is too close to the mounting hole in the mold cavity, the magnet will break when it is inserted (magnetic brittleness). If it is glued to the hole, the glue will fail at high temperatures. In addition, if the magnet is installed in the mounting hole with a clearance fit, glue will seep into the mounting hole during injection molding, resulting in appearance defects. Utility Model Content

[0005] The present invention aims to overcome at least one of the defects of the prior art and provide a mold for vulcanizing double-sided skeleton silicone shock-absorbing pads, which solves the technical problems of unreliable magnet installation in injection molds and appearance defects of double-sided skeleton shock-absorbing pads after injection molding.

[0006] The technical solution adopted by this utility model is a mold for vulcanizing a double-sided skeleton silicone shock-absorbing pad, comprising: an upper mold and a lower mold, wherein the upper mold and the lower mold are respectively provided with multiple corresponding upper cavities and lower cavities, and when closed, the upper cavities and the lower cavities form a sealed vulcanizing cavity; a magnetic adsorption component is disposed in the top area of ​​the upper mold, the magnetic adsorption component includes a magnet, the magnet is offset from the upper cavity in the vertical direction, and the magnet is isolated from the upper cavity; wherein, the magnet is used to adsorb the upper skeleton of the silicone shock-absorbing pad to fix the position of the upper skeleton during the vulcanization process.

[0007] This mold utilizes an innovative design with a magnetic adsorption component. A magnet, vertically offset and completely isolated from the upper cavity, is placed in the top area of ​​the upper mold. This magnetic force indirectly attracts the upper frame of the silicone shock-absorbing pad, effectively solving the problems of detachment, breakage, glue failure, and appearance defects in double-sided frame shock-absorbing pads after injection molding that exist with traditional magnet fixing methods. The magnet is completely physically isolated from the cavity, preventing overflow, flash, or stains caused by molten silicone seeping in, ensuring a smooth and flat product surface after vulcanization, and effectively reducing the scrap rate.

[0008] Furthermore, when the vertical distance between the bottom surface of the magnet and the top surface of the upper cavity is 0.5 mm, the lateral misalignment distance between the side of the magnet and the side of the upper cavity is no more than 3 mm. This magnet positioning structure, by controlling the vertical distance (0.5 mm) and the lateral misalignment distance (no more than 3 mm) between the magnet and the upper cavity, ensures that the magnet has an attractive force on the upper skeleton during vulcanization and maintains a safe distance from the mold, thus ensuring that the mold has high structural strength.

[0009] Furthermore, the upper mold and lower mold are respectively detachably equipped with an upper core and a lower core. The upper cavity is formed on the upper core, and the lower cavity is formed on the lower core. The top area of ​​the upper core is provided with an embedding hole that matches the shape of the magnet. The magnet is fixed to the top of the upper core through the embedding hole, and the embedding hole and the upper cavity are isolated by the body structure of the upper core. This design allows for flexible replacement of the mold cavity through the detachable upper and lower cores, facilitating maintenance and adaptation to different product specifications. The magnet is fixed and isolated in the upper cavity through the embedding hole, ensuring accurate adsorption and positioning of the skeleton, and allowing for easy adjustment of the skeleton position if the adsorption force is too strong and the skeleton is not placed correctly.

[0010] Furthermore, a pre-drilled hole is provided on the top surface of the upper cavity, and a boss is formed on the boss surface of the upper skeleton. The outer diameter of the boss is smaller than the diameter of the pre-drilled hole, and the height of the boss is smaller than the depth of the pre-drilled hole. This structure, through the clearance fit between the boss and the pre-drilled hole (outer diameter difference of 0.4-0.6 mm, height difference reserved space), forms a clearance structure, ensuring the precise positioning of the upper skeleton in the mold and avoiding skeleton displacement during vulcanization, which would lead to uneven sealing or glue overflow. At the same time, the appropriate clearance ensures that the silicone material fully fills the interface between the skeleton and the mold during vulcanization, improving the sealing performance, and the height limitation prevents the boss from being too deep, causing mold interference and glue leakage onto the boss surface of the upper skeleton during injection molding, thereby reducing product defects and improving the vulcanization molding yield.

[0011] Furthermore, when the upper and lower cavities are closed, a gap is formed between their mating surfaces. The width of this gap is 0.05 mm, which allows for the formation of a flash layer during injection molding. This reasonable gap ensures a suitable flash structure for trimming. The silicone used in this type of shock-absorbing pad has good elasticity, and the rubber has a Shore hardness of 30-35 degrees. Thicker rubber is difficult to tear, and tearing it easily leaves granular residue. Flash formed at this size is very easy to remove manually; it tears off easily without leaving any residue.

[0012] Furthermore, the vulcanization pressure during vulcanization of the mold used for vulcanizing the double-sided skeleton silicone shock absorber is 5 MPa. The vulcanization pressure is reduced to 55 MPa to enhance the sealing effect of the skeleton on the rubber material and reduce glue overflow defects.

[0013] Furthermore, the magnet has a heat resistance temperature of not less than 300℃. This ensures that it maintains magnetic stability in the high-temperature working environment of the vulcanization mold and prevents magnetic attenuation or structural failure due to excessive temperature.

[0014] Furthermore, the upper and lower molds are connected on the same side via a hinge structure. After the upper mold is pried open using a lever, it flips to one side, allowing both the upper and lower cavities to face the operator, making product removal and skeleton placement easy. This structure reduces labor intensity, making it suitable for both male and female operators, eliminating the need to specifically hire male employees.

[0015] Furthermore, the upper mold is equipped with a glue injection system, which includes a glue injection cylinder located in the top area of ​​the upper mold for storing or conveying raw materials; a top block slidably disposed within the glue injection cylinder for squeezing the raw materials and causing them to flow into the mold cavity through the flow channel within the upper mold; and a spring disposed between the top block and the inner wall of the glue injection cylinder for providing elastic force to push the glue injection cylinder open after the vulcanizing machine is removed. The movement of the top block overcomes the elastic force of the spring through external force, squeezing the raw materials into the flow channel for glue injection. Only one glue injection cylinder is manufactured, and all the rubber used in the mold cavities is supplied through this cylinder. Pre-forming can be completed using a single piece of rubber, improving efficiency. Similar products can be manufactured using commercially available vulcanizing machines, saving the cost of developing such equipment.

[0016] Furthermore, the lower mold is equipped with an ejection mechanism, including a top plate and ejector pins. The top plate drives the ejector pins to move in a preset direction to eject the vulcanized double-sided skeleton silicone damping pad. This ejection mechanism, through the top plate driving the ejector pins in a preset direction, precisely ejects the vulcanized double-sided skeleton silicone damping pad, effectively solving the problems of product deformation, damage to the sealing surface, or sticking to the mold that are common in traditional demolding methods. Its automated design significantly improves demolding efficiency, reduces manual intervention, and avoids separation of the rubber body from the skeleton due to improper ejection force or direction, ensuring the structural integrity of the product.

[0017] Compared with existing technologies, the advantages of this invention are as follows: Through the innovative design of the magnetic adsorption component, a magnet is set in the top area of ​​the upper mold, vertically offset from and completely isolated from the upper cavity. This uses magnetic force to indirectly adsorb the upper skeleton of the silicone shock-absorbing pad, effectively solving the problems of detachment, breakage, glue failure, and appearance defects of the double-sided skeleton shock-absorbing pad after injection molding that exist in traditional magnet fixing methods. The magnet is completely physically isolated from the cavity, preventing overflow, flash, or stains caused by molten silicone seeping in, ensuring a smooth and flat product surface after vulcanization, and effectively reducing the scrap rate.

[0018] The mold cavity can be flexibly replaced by a detachable upper core and lower core, which is convenient for maintenance and adapting to different product specifications. The clearance fit between the boss and the reserved hole (outer diameter difference 0.4~0.6 mm, height difference reserved space) forms a clearance structure to ensure the precise positioning of the upper skeleton in the mold and avoid skeleton displacement during vulcanization, which may lead to uneven sealing or glue overflow. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the double-sided skeleton silicone shock-absorbing pad of this utility model.

[0020] Figure 2 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 3 This is a partial structural diagram of the upper and lower molds of this utility model.

[0022] Figure 4 This utility model Figure 3 Enlarged view of the local structure at point A in the middle.

[0023] Figure 5 This is a front view of the upper mold of this utility model.

[0024] In the diagram: 1. Double-sided skeleton silicone shock-absorbing pad; 2. Upper skeleton; 21. Boss surface; 211. Boss; 22. Warped surface; 3. Lower skeleton; 4. Rubber body; 5. Upper mold; 51. Upper cavity; 511. Reserved hole; 52. Upper core; 53. Embedded hole; 6. Lower mold; 61. Lower cavity; 62. Lower core; 7. Hinge structure; 8. Magnet; 9. Connecting runner; 10. Top plate; 11. Injection cylinder; 12. Spring; 13. Top block; 14. Runner; 15. Ejector pin. Detailed Implementation

[0025] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0026] like Figure 1 As shown, the double-sided skeleton silicone shock absorber 1 includes a rubber body 4 and a skeleton. The skeleton includes an upper skeleton 2 and a lower skeleton 3. The upper skeleton 2 and the lower skeleton 3 are respectively attached to the top and bottom of the rubber body 4. The upper skeleton 2 and the lower skeleton 3 are respectively vulcanized and bonded to the rubber body 4. The rubber body 4 is made of silicone rubber with a Shore hardness of 30 to 35 degrees.

[0027] The technical problem this invention aims to solve is how to successfully mass-produce silicone shock-absorbing pads with skeletons on both the top and bottom surfaces. This invention provides a vulcanization mold structure for such products.

[0028] The current challenges in manufacturing this product are:

[0029] 1. It has skeletons at both the top and bottom, making it impossible to position it in the mold. The upper skeleton is prone to falling into the cavity.

[0030] 2. In order to achieve better shock absorption, this type of shock-absorbing pad will use low-hardness silicone (rubber with a Shore hardness of 30-35 degrees) with good shock absorption performance and excellent elasticity. The characteristic of this silicone is that it has high viscosity and is difficult to pre-form. One of the difficulties that this mold solves is how to improve the efficiency of pre-forming. Silicone is a semi-fluid state with high viscosity, which is not easy to pre-form mechanically. The efficiency of one product per blank is very low.

[0031] 3. Silicone has excellent fluidity and is prone to overflowing and spreading to the skeleton surface, resulting in substandard product appearance.

[0032] 4. There are no dedicated vulcanizing machines with this structure, or the equipment is too expensive and the return on investment is not worthwhile.

[0033] 5. The rubber of the silicone damping pad has very good fluidity, which may result in the cavity closer to the injection hole being filled with rubber, while the cavity farther away is not yet filled with rubber. By the time the cavity farther away is filled with rubber, the cavity closer to the hole has already started to overflow with rubber.

[0034] like Figure 2 As shown, this utility model discloses a mold for vulcanizing a double-sided skeleton silicone shock-absorbing pad. The mold is specifically designed for vulcanizing silicone shock-absorbing pads with a double-sided skeleton structure and includes an upper mold 5 and a lower mold 6. The upper mold 5 integrates an injection system and has multiple upper cavities 51. Correspondingly, the lower mold 6 has the same number of lower cavities 61. The upper cavities 51 and lower cavities 61 form the cavity for vulcanizing the double-sided skeleton silicone shock-absorbing pad 1. When the upper mold 5 and lower mold 6 are precisely aligned and closed, each upper cavity 51 will perfectly align with its corresponding lower cavity 61, forming a sealed cavity to accommodate and vulcanize the silicone shock-absorbing pad with an upper skeleton 2 and a lower skeleton 3.

[0035] like Figure 1 , 2 As shown in Figure 3: To prevent the upper skeleton 2 from falling off when installed in the upper cavity 51, several magnets 8 are installed inside the upper mold 5 to attract the upper skeleton 2. One magnet 8 is installed at the top of each upper cavity 51. The magnets 8 are high-temperature resistant magnets, such as samarium cobalt magnets that can withstand temperatures up to 350 degrees Celsius. As long as they can withstand the high temperature of injection molding, the attraction force is greater than the weight of the upper skeleton 2. The distance between the magnet 8 and the upper cavity 51 affects its attraction force on the upper skeleton 2. If it is too thick, the magnetic force is weakened and the upper skeleton 2 cannot be attracted. If it is too thin, the mold strength is insufficient and it is easy to deform under pressure. Finally, through multiple rounds of verification, the height distance between the magnet 8 and the upper cavity 51 ( Figure 3 (As shown in H) is 0.5mm; the position and size are also relatively important. If the position of magnet 8 is completely aligned with the top of the upper cavity 51, the strength of the top of the upper cavity 51 will be insufficient and it will be easily crushed. Therefore, magnet 8 should be offset from the upper cavity 51, that is, on one side, magnet 8 should be at most 3mm away from the side of the upper cavity 51. Figure 3 As shown in L in the figure, the specific situation at this time is as follows:

[0036] Initially, the design distance was 1.1mm, but the adsorption force was insufficient, and almost all the skeletons fell off. Reducing it to 0.9mm resulted in 80% falling off, showing initial effectiveness. Reducing it to 0.7mm resulted in 50% falling off, and to 0.6mm, almost no falling off occurred. However, during mold operation and handling, vibrations caused some skeletons to fall off, indicating insufficient adsorption force. Reducing it to 0.5mm prevented falling off. In a batch production of 2000 pieces, no skeleton falling off occurred, and the 0.5mm dimension was finalized. Initially, misalignment was not an issue at a thickness of 1.1mm. Later, as the thickness was gradually reduced to 0.5mm, it became too thin, causing deformation of the cavity wall. To increase the strength of the partition wall, a misalignment method was adopted. Initially, cylindrical magnets without holes were used directly on top, but this caused the central column in the cavity to be compressed and deformed. At misalignments of 4mm and 5mm, the magnet adsorption area was small, resulting in insufficient adsorption force.

[0037] During rubber vulcanization, the mold temperature needs to reach around 200°C. High-temperature resistant and strong magnets are used here, and the magnets must not lose their magnetism due to high temperatures; they must maintain their magnetism at high temperatures. The position of the magnets in the mold is very important. If the distance between the magnets and the frame is too far, they cannot be attracted; if they are too close, the mold must be thin, and if the strength is insufficient, the mold will easily deform.

[0038] like Figure 3As shown, considering the potential for future aging of magnet 8, insufficient attraction, and the need for replacement; or improper operation by the operator, such as improper placement of the frame, leading to mold damage. This invention employs a detachable core structure for the mold. The upper core 52 and lower core 62 are respectively installed on the upper mold 5 and lower mold 6 using countersunk screws. The upper core 52 has an insertion hole 53 for installing the magnet 8. Removing the upper core 52 allows for the insertion of the magnet 8. If the upper core 52 or lower core 62 is damaged, or if the magnet 8 ages, the countersunk screws can be quickly removed for replacement. If any individual cavity is damaged, the amount of adhesive used in the entire mold, the vulcanization process, and the operating procedures will change, leading to changes in the overall vulcanization efficiency and negatively impacting product quality stability. The core structure allows for immediate replacement, enabling the mold to be put into use as soon as possible. No changes to the vulcanization process are required, ensuring product consistency.

[0039] like Figure 2 As shown, the glue injection system includes a glue injection cylinder 11 disposed within the upper mold 5, a spring 12 disposed within the glue injection cylinder 11, and a top block 13 disposed within the glue injection cylinder 11. A flow channel 14 is provided within the upper mold 5 for connecting the glue injection cylinder 11 and the cavity; as shown... Figure 4 As shown, the cavities are connected by a uniform and reasonable layout of connecting channels 9 (e.g.) Figure 4 (As shown) and connected to the output port of the flow channel 14, ensuring that the distance between each upper cavity 51 and the output port of the flow channel 14 is the same, guaranteeing that the amount of rubber flowing into each cavity at the same time is the same, ensuring that each cavity can be filled with rubber at the same time, and preventing situations where some cavities are short of rubber while others have started to cross-contaminate. Only one injection cylinder 11 is manufactured, and all the rubber used in all cavities is supplied through this injection cylinder 11. During preforming, one piece of rubber can be used, improving efficiency.

[0040] When adding raw materials, the amount of rubber needed for all cavities needs to be calculated, and then the volume of the injection cylinder 11 needs to be calculated. The volume of the injection cylinder 11 must be greater than the sum of the volumes of all cavities, the runner 14, the connecting runner 9, and the flash material to ensure sufficient rubber injection. During injection molding, simply fill the injection cylinder 11 with a single piece of rubber. For example, if the unit consumption for one product is 3g, and there are 16 cavities, then 48g of rubber is needed. Adding the rubber type for the injection holes, runner 14, connecting runner 9, and flash in the injection cylinder 11, the total is 57.6g. Then, calculate the volume space required for 57.6g of rubber. The injection cylinder 11 must have sufficient depth and diameter to hold 57.6g of rubber.

[0041] like Figure 4As shown, the clearance structure has a boss surface 21 at one end and a warped surface 22 at the other end of the upper frame 2. The boss surface 21 is provided with a boss 211, and the top of the upper cavity 51 is provided with a reserved hole 511. The diameter of the boss 211 is smaller than the diameter of the reserved hole 511, approximately 0.4 to 0.6 mm, preferably 0.5 mm. This is only to illustrate the role of this clearance structure in product molding. As for the specific data, it is necessary to comprehensively consider and adjust according to the product shape, magnet size, frame material, molding temperature, etc.

[0042] The height of the boss 211 is less than the depth of the pre-drilled hole 511. During vulcanization, the boss 211 of the upper skeleton 2's boss surface 21 is inserted into the pre-drilled hole 511, and the boss surface 21 and the end face of the pre-drilled hole 511 are tightly fitted. This design effectively prevents glue from migrating to the boss surface 21 of the upper skeleton 2. Similarly, the lower skeleton 3 and the lower cavity 61 also have similar structures, which effectively prevent glue from migrating to the boss surface 21 of the lower skeleton 3 during injection molding. Due to process limitations during skeleton stamping, one side of the stamped skeleton is flat, while the other side is prone to having a curved surface (i.e., warped surface 22). The curved surface is prone to unevenness in the mold and easy glue migration. The curved surface is marked during skeleton stamping, and the marked surface is used as the vulcanizing surface during vulcanization, while the boss surface 21 is the sealing surface, which is better for sealing. By adopting an open structure, the smaller the contact area between the skeleton sealing part and the mold, the less the sealing effect is affected by the flatness of the skeleton, and the easier it is to seal. Excessive vulcanization pressure can cause rubber to flow too quickly and increase impact force, leading to rubber cross-contamination. Multiple tests have verified that a vulcanization pressure of 5 MPa ensures sufficient rubber injection into the mold cavity while avoiding overflow and cross-contamination defects; therefore, a lower pressure value of 5 MPa is preferred.

[0043] like Figure 4 As shown, after the upper skeleton 2 is placed into the upper cavity 51, the warped surfaces 22 (surfaces that have been bent and deformed compared to the plane) of the upper skeleton 2 and the lower skeleton 3 are all facing away from the top of the upper skeleton 2 cavity and the bottom of the lower skeleton 3 cavity. During injection molding after placement, the rubber material first contacts the warped surface 22, and the non-warped surface 22 is the sealing surface. This will avoid the situation where the skeleton mold does not fit tightly due to skeleton warping deformation and overflow. In addition, the sealing surface adopts the method of avoiding gaps (i.e., the boss 211 is inserted into the reserved hole 511) to adjust the radial dimension of the skeleton and the mold fitting part to 0.5mm as much as possible (i.e., the diameter of the boss 211 is 0.5mm smaller than the size of the reserved hole 511), minimizing the risk of skeleton deformation leading to poor fitting and overflow. Another factor is the pressure. If the pressure is high, the impact force of the rubber between the upper skeleton 2 and the top of the upper cavity will be greater. The rubber will enter between the upper skeleton 2 and the top of the upper cavity 51 through the gap. Multiple tests have shown that the best effect is achieved when the vulcanization pressure of the equipment is 5MPa. If it is less than 4MPa, the rubber will not fill the space, the cavity pressure will be insufficient, the density will be low, and the adhesion will be poor.

[0044] like Figure 4 As shown, the burr thickness, which is the gap between the upper cavity 51 and the lower cavity 61 (d in the figure), should remain consistent at an optimal tear-off thickness of 0.05mm. If it exceeds 0.1mm, the burr will be difficult to tear, leaving granular residue. If it is less than 0.05mm, the rubber will be unable to be injected into the cavity through the excess rubber channel. Therefore, 0.05mm is the optimal thickness. Using an injection molding structure, the burr thickness is less affected by interference factors, has good consistency, and the thickness will not change, always remaining at a thickness suitable for easy tearing.

[0045] like Figure 1-5 As shown, due to the limitations of the product structure, during vulcanization, the upper skeleton 2 needs to be placed in the upper cavity 51 of the upper mold 5. If a traditional solution is used, when the automatic vulcanizing machine with a flip-up plate pulls open the injection cylinder 11 and raises the upper mold 5, it is difficult for the operator to place the upper skeleton; they would have to tilt their head back, making it very difficult to place the skeletons one by one. Therefore, the upper mold 5 is connected to the lower mold 6 via a hinge structure 7. After the upper mold 5 is pried open by a lever, it flips to one side, so that both the upper cavity 51 and the lower cavity 61 face the operator, making it easy to remove the product and place the skeleton. Using this structure, the labor intensity is reduced, and both male and female operators can perform the task, eliminating the need to specifically select male employees.

[0046] To facilitate operation, this solution focuses on three key aspects: First, the lifting of the injection cylinder 11 utilizes a compression spring 12, requiring minimal effort. Once the pressure applied to the mold by the vulcanizing machine is removed, the compression spring 12 will lift and open the injection cylinder 11. Second, a hinge structure 7 is employed, allowing the mold to be easily pried open on the right side using a pry bar and lever principle, aligning the upper cavity 51 of the upper mold 5 directly with the operator. Third, the product removal process utilizes an ejection mechanism within the lower mold 6. Pressure is applied to the top plate 10, which drives the ejector pin 15 to move, ejecting the product and effectively improving its automation performance.

[0047] The mold design includes a glue injection cylinder 11. Pre-forming only requires one piece of rubber. The weight of the rubber blank is weighed manually, and the mixed rubber is torn by hand (silicone has a high viscosity and is easy to stick to the knife). Sealing is the difficult part, and three methods are used: First, the skeleton is identified, which is divided into a warped surface 22 and a boss surface 21; second, the skeleton sealing surface adopts an air-proof structure in the mold; third, the vulcanization pressure is reduced to 5MPa.

[0048] If the entire process requires mechanical equipment, there is currently no such equipment on the market. If such equipment were to be specially developed, the cost would be very high. This invention can save the funds for developing such equipment and can achieve the production of similar products using ordinary vulcanizing machines available on the market.

[0049] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model, and are not intended to limit the specific implementation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A mold for vulcanizing double-sided skeleton silicone shock-absorbing pads, characterized in that, include: The upper mold (5) and the lower mold (6) are respectively provided with multiple corresponding upper cavities (51) and lower cavities (61). When closed, the upper cavity (51) and the lower cavity (61) form a sealed vulcanized cavity. A magnetic adsorption assembly is disposed in the top area of ​​the upper mold (5). The magnetic adsorption assembly includes a magnet (8). The magnet (8) is offset from the upper cavity (51) in the vertical direction and is isolated from the upper cavity (51). The magnet (8) is used to adsorb the upper skeleton (2) of the silicone shock-absorbing pad.

2. The mold for vulcanizing double-sided skeleton silicone shock-absorbing pads according to claim 1, characterized in that: When the vertical distance between the bottom surface of the magnet (8) and the top surface of the upper cavity (51) is 0.5 mm, the misalignment distance between the side of the magnet (8) and the side of the upper cavity (51) in the lateral direction is no more than 3 mm.

3. The mold for vulcanizing double-sided skeleton silicone shock-absorbing pads according to claim 1, characterized in that: The upper mold (5) and the lower mold (6) are respectively detachably equipped with an upper core (52) and a lower core (62), the upper cavity (51) is formed on the upper core (52), and the lower cavity (61) is formed on the lower core (62); The top region of the upper core (52) is provided with an embedding hole (53) that matches the shape of the magnet (8). The magnet (8) is fixed to the top of the upper core (52) through the embedding hole (53), and the embedding hole (53) and the upper cavity (51) are isolated by the body structure of the upper core (52).

4. The mold for vulcanizing double-sided skeleton silicone shock-absorbing pads according to claim 1, characterized in that: When the upper cavity (51) and the lower cavity (61) are closed, a gap is formed between their mating surfaces. The width of the gap is 0.05 mm, so as to form a flash layer during the injection molding process.

5. The mold for vulcanizing double-sided skeleton silicone shock-absorbing pads according to claim 1, characterized in that: The vulcanization pressure of the mold used for vulcanizing the double-sided skeleton silicone shock-absorbing pad is 5 MPa.

6. The mold for vulcanizing double-sided skeleton silicone shock-absorbing pads according to any one of claims 1-5, characterized in that: The heat resistance temperature of the magnet (8) is not lower than 300℃.

7. The mold for vulcanizing double-sided skeleton silicone shock-absorbing pads according to any one of claims 1-5, characterized in that: The upper mold (5) and the lower mold (6) are connected on the same side by a hinge structure (7).

8. The mold for vulcanizing double-sided skeleton silicone shock-absorbing pads according to any one of claims 1-5, characterized in that: The upper mold (5) is provided with a glue injection system, which includes a glue injection cylinder (11) located in the top area of ​​the upper mold (5) for storing or conveying raw materials; The top block (13) is slidably set in the injection cylinder (11) to squeeze the raw material and make it flow into the cavity through the flow channel (14) in the upper mold (5); A spring (12) is provided between the top block (13) and the inner wall of the injection cylinder (11) to provide elastic force to push the injection cylinder (11) open after the vulcanizing machine is removed. The movement of the top block (13) overcomes the elastic force of the spring (12) by external force to squeeze the raw material into the flow channel (14) for injection.

9. The mold for vulcanizing double-sided skeleton silicone shock-absorbing pads according to any one of claims 1-5, characterized in that: The lower mold (6) is provided with an ejection mechanism, including a top plate (10) and an ejector pin (15); the top plate (10) drives the ejector pin (15) to move in a preset direction to eject the vulcanized double-sided skeleton silicone shock-absorbing pad.

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