Cold bonding molding composite press for rubber and metal parts

Abstract

This utility model relates to the field of mold forming technology, and in particular to a composite mold for cold bonding of rubber and metal parts, comprising an upper mold, a middle mold, and a lower mold. The upper and lower molds are respectively disposed on the upper and lower sides of the middle mold. The upper mold has several cavities, each cavity having an venting and weight-reducing hole, and each venting and weight-reducing hole having contact groove cavities on both sides. The middle mold has a stepped hole at the top, a positioning through hole in the middle, and a large-sized inner hole at the bottom. The upper part of the metal part is located in the stepped hole, and the contact groove cavities are connected to the upper part of the metal part. The surface contact fit provides pressure to the upper rubber part of the metal part. The raised truncated cone on the upper part of the metal part is set in the venting and weight reduction hole of the upper mold. The lower rubber part on the upper side of the metal part is in contact fit with the step of the stepped hole. The middle part of the metal part is a positioning section. The surface of the positioning section is provided with a positioning surface. The positioning surface fits with the positioning through hole to realize the positioning of the metal part. The lower part of the metal part is a long rod section. The long rod section is located in a large-sized inner hole. The bottom of the long rod section is provided with a long rod lower end face. The long rod lower end face is in contact fit with the upper surface of the lower mold.

Description

Technical Field

[0001] This utility model relates to the field of mold forming technology, and in particular to the structural design of a composite mold required in the cold bonding molding process of rubber and metal parts. Background Technology

[0002] In aerospace equipment systems and components, rubber seals are a fundamental and universal component in sealing devices, playing a crucial and irreplaceable role in resolving the inherent contradiction between leakage and sealing. Rubber seals are widely used in sealing technology because they are valuable elastic polymer materials with a wide temperature range. They exhibit significant deformation under relatively small stress in different media, providing contact pressure, compensating for leakage gaps, and achieving a seal. However, for some metal parts, the design structure is unique to meet functional requirements, making traditional hot vulcanization unsuitable for bonding rubber and metal. Cold bonding molding is necessary, but the following problems exist in the actual production process: 1. In the traditional cold bonding process of rubber and metal parts, since rubber is a non-metallic material, it has a certain degree of deformation under natural placement. When adhesive is applied to the bonding surface of the metal part, the rubber will rebound and deform at the bonding surface due to the stress of the rubber part itself. This results in the rubber part and metal part not being firmly bonded. At the same time, the flatness dimension of the upper end of the rubber increases, and the sealing function of the rubber-metal valve assembly product fails.

[0003] 2. During the production and processing of the company's products, each rubber part and metal part requires a set of compression molds to ensure the bonding quality of the product. This leads to increased production costs for the company. At the same time, the time cost and labor intensity of the complete process of opening, installing metal parts and closing each set of compression molds are also unbearable for the company.

[0004] Therefore, there is an urgent need for a composite molding die for cold bonding of rubber and metal parts to solve the above series of problems. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings in the background technology. This utility model discloses a composite compression mold for cold bonding of rubber and metal parts. This utility model can realize the cold bonding of rubber products and metal parts through adhesive to meet the sealing function of the formed rubber-metal assembly. It has many advantages such as strong innovation, simple structure, convenient operation and high production efficiency.

[0006] Technical solution: A composite mold for cold bonding of rubber and metal parts includes an upper mold 1, a middle mold 2, and a lower mold 3. The upper mold 1 and the lower mold 3 are respectively disposed on the upper and lower sides of the middle mold 2. The upper mold has several cavities, each cavity having an venting and weight-reducing hole 12, and each venting and weight-reducing hole having a contact groove cavity 11 on both sides. The middle mold 2 has a stepped hole at the top, a positioning through hole 14 in the middle, and a large-sized inner hole 15 at the bottom. The upper part of the metal part is located in the stepped hole, and the contact groove cavity 11 contacts the upper surface of the metal part. The upper rubber part of the metal part is pressurized. The raised truncated cone of the upper metal part is set in the venting and weight reduction hole 12 of the upper mold. The lower rubber part 7 on the upper side of the metal part is in contact with the step of the stepped hole. The middle part of the metal part is a positioning section. The positioning section is provided with a positioning surface 9. The positioning surface is in contact with the positioning through hole 14 to realize the positioning of the metal part. The lower part of the metal part is a long rod section. The long rod section is located in the large-size inner hole 15. The bottom of the long rod section is provided with a long rod lower end face 10. The long rod lower end face is in contact with the upper surface of the lower mold.

[0007] Furthermore, the upper mold 1 and the middle mold 2 are fitted together with a clearance by two large locating pins 4.

[0008] Furthermore, the lower mold 3 has a planar structure, and the lower mold 3 is fitted with the middle mold 2 with a clearance through two locating pins on opposite corners.

[0009] Furthermore, the lower mold 3 is provided with a mis-proof positioning pin 20, which cooperates with the mis-proof positioning pin hole on the middle mold 2.

[0010] Furthermore, the upper mold, middle mold, and lower mold form a closed cavity.

[0011] Furthermore, the upper end of the side of the middle mold 2 has an L-shaped stepped structure, which forms an opening groove 16 with the lower end face of the upper mold, for opening the upper mold 1.

[0012] Furthermore, the upper end of the side of the lower mold 3 has an L-shaped stepped structure, which forms an opening groove 19 with the lower end face of the middle mold, for opening the lower mold 3.

[0013] Technical effects of this utility model: This utility model proposes a composite mold for cold bonding of rubber and metal parts. In production applications, it boasts numerous advantages, including strong innovation, simple structure, convenient operation, stable and reliable quality, and high production efficiency. It can meet the needs of mass production of cold-bonded rubber and metal parts, specifically offering the following advantages: (1) Compared with the prior art, the most important innovation of this utility model is the use of a completely new cold-bonding three-layer multi-cavity compression mold design. The composite compression mold adopts a planar structure as a whole, forming a closed cavity through the upper mold, middle mold, and lower mold, and adopts a positioning pin positioning structure. In the specific production operation, the upper mold is opened, the rubber and metal components that have just been bonded are placed into the middle mold, and the upper mold is closed to achieve stable pressing, bonding, curing and molding of rubber and metal parts.

[0014] After using the cold bonding composite molding with this structure, the cold bonding production process of rubber products and metal parts is simple to operate, the bonding is firm, and the production efficiency is high, which can meet the normal production of metal rubber components and the customer's product assembly needs.

[0015] (2) The mold cavity is designed with a through hole in the middle and a rectangular groove structure of a certain depth outside the hole. The traditional design concept of a planar structure is no longer adopted because there is a raised truncated cone in the middle of the upper surface of this type of metal valve assembly. The edge of the truncated cone is a certain distance from the rubber part, and the planar structure cannot achieve effective bonding between the rubber and the metal part.

[0016] This novel design effectively avoids protruding parts on the metal components, while the through-holes allow for significant weight reduction in the mold. The bottom of the rectangular groove cavity contacts the upper surface of the upper rubber component, applying a certain force to enhance the adhesion between the rubber and metal components.

[0017] (3) The upper end of the middle mold is designed as a stepped hole structure. This design can form a step at the junction of the two holes, namely the junction fillet R. Under the action of the metal part's own weight, the fillet not only plays a supporting role, but also applies a certain force to the rubber surface under the influence of gravity, which promotes the improvement of the adhesion between the lower rubber part and the metal.

[0018] (4) The middle position of the mold is designed as a positioning through-hole structure. Because this type of rubber-metal valve assembly has two sealing zones, namely the upper rubber part and the lower rubber part, the upper rubber part is pressed by the upper mold, and the lower rubber part is pressed by the assembly's own weight combined with the corner R of the middle mold. The metal-rubber assembly will move to some extent within the middle mold, resulting in uneven stress on the two rubber surfaces. By designing the middle position of the mold as a positioning through-hole structure, the long rod of the metal part in the assembly passes through this hole, restricting the horizontal movement of the entire assembly and achieving overall positioning. This invention effectively solves the problem of indentations on the rubber surface caused by uneven stress on the upper and lower rubber parts, as well as the problem of uneven circumferential adhesive stress.

[0019] (5) The lower end of the middle mold is designed with a large-size inner hole structure. Due to the long length of the rubber-metal valve assembly, the relative displacement between the long rod and the mold is relatively long during the process of inserting the metal part into the mold and opening the mold. This can easily cause surface scratches and appearance quality problems. At the same time, it is very inconvenient to remove the metal part after opening the mold. With the lower end of the middle mold designed with a large-size inner hole structure, the size of the middle positioning surface of the middle mold becomes smaller, which can effectively avoid scratches and appearance defects. With the increase in the diameter of the inner hole, the rubber-metal assembly can be easily ejected by gently pressing the lower end of the metal rod with a finger at the lower end of the inner hole, and demolding can be done smoothly and quickly.

[0020] (6) Anti-misalignment pins are designed for the lower mold. The lower mold needs to cooperate with the middle mold. After cooperation, it plays the role of supporting the long rod of the metal part in the whole mold. It needs to be cooperated by locating pins. Usually only two locating pins are needed. However, the two locating pins of the lower mold should avoid the locating hole positions of the upper mold and the middle mold. That is, they are designed at diagonal positions on both sides of the lower mold. In the actual operation, the lower mold and the middle mold are easy to be placed in reverse, resulting in the two not being able to cooperate. Therefore, anti-misalignment pins are designed for the lower mold. The size of the anti-misalignment hole in the middle mold is much larger than the outer diameter of the anti-misalignment pin. The anti-misalignment function replaces the locating function, and the operator can easily and quickly assemble and assemble the mold. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the use of the composite molding die for cold bonding of rubber and metal parts according to this utility model; Figure 2 This is a schematic diagram of a metal part; Figure 3 This is a schematic diagram of the upper mold; Figure 4 This is a schematic diagram of the intermediate model; Figure 5 This is a schematic diagram of the lower mold; The components are as follows: 1. Upper mold; 2. Middle mold; 3. Lower mold; 4. Large locating pin; 5. Small locating pin; 6. Upper rubber part; 7. Lower rubber part; 8. Raised truncated cone; 9. Long rod locating surface; 10. Lower end face of long rod; 11. Upper mold pressing surface cavity; 12. Upper mold through hole; 13. Step corner R; 14. Locating through hole; 15. Large inner hole; 16. Middle mold opening groove; 17. Middle mold locating hole; 18. Middle mold anti-misalignment hole; 19. Lower mold opening groove; 20. Lower mold anti-misalignment hole; 21. Lower mold locating hole. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] The features and illustrative embodiments of various aspects of this utility model will now be described in detail. In the following detailed description, numerous specific details are set forth in order to provide a comprehensive understanding of this utility model. However, it will be apparent to those skilled in the art that this utility model can be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this utility model by illustrating examples of it. This utility model is by no means limited to any specific arrangements and methods set forth below, but covers any improvements, substitutions, and modifications to the structure, method, and apparatus without departing from the spirit of this utility model. In the accompanying drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring this utility model.

[0025] It should be noted that, where there is no conflict, the embodiments of this utility model and the features therein can be combined with each other, and the various embodiments can be referenced and cited in turn. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] Figure 1-5 This is a schematic diagram illustrating an embodiment of the present invention: a composite molding die for cold bonding of rubber and metal parts. See the attached specification. Figure 1-5 This utility model proposes a composite mold for cold bonding of rubber and metal parts, comprising an upper mold 1, a middle mold 2, a lower mold 3, large locating pins 4, and small locating pins 5. The upper mold 3 consists of 15 cavities, each with a venting and weight-reducing through-hole 12 and a contact groove cavity 11 providing pressure to the upper rubber part 6. The middle mold 2 has a stepped hole at the upper end, a locating through-hole 14 in the middle, and a large inner hole 15 at the lower end. The upper mold 1 and the middle mold 2 are connected by two large locating pins 4. The lower mold 3 has a planar structure, providing support for the lower end face 10 of the long metal rod. The lower mold 3 is connected to the middle mold 2 by two locating pins on its diagonally opposite sides, and is also designed with anti-misalignment locating pins 20 to prevent misalignment during assembly. After assembly, the upper mold 1, middle mold 2, and lower mold 3 form a complete closed cavity at the middle mold 2.

[0027] During the cold bonding process between rubber and metal parts, the entire mold is first opened, the upper mold 1 is placed on the operating platform, and then the rubber-metal valve assembly that has been preliminarily bonded is placed into the middle mold 2. During this process, the long metal rod is carefully and slowly passed through the positioning through hole 14 of the middle mold until the lower rubber part 7 contacts the upper end of the middle mold 2 at the R-angle 13. The remaining 14 parts are handled in the same way. After all the valve assemblies have been placed in all the cavities, the upper end of the raised truncated cone 8 of the metal part is checked to see if there is a significant height difference. If there is no such difference, the upper mold is closed.

[0028] When preparing to demold after the rubber and metal parts have been cold-bonded, first open the upper mold 1 and place it on the operating table, then open the lower mold 3, so that both ends of the middle mold 2 are fully exposed. At this time, press the lower end face 11 of the long metal rod with your fingers to push out the metal-rubber valve assembly, and place it in the product box required by the process specifications. At this point, the cold bonding and curing of the rubber and metal parts in the mold is completed.

[0029] After the rubber-metal valve assembly is cold-bonded and molded, the mold is in a three-layer closed assembly state, making mold opening difficult. To solve this problem, a single-sided L-shaped step structure is machined on the upper part of the sides of the middle mold 2 and the lower mold 3, serving as mold opening grooves 16 and 19. When the mold is closed, the mold opening tool can be placed in this position, and the upper mold 1 and the lower mold 3 can be opened separately using the lever principle, which is convenient, quick, and has high mold opening efficiency.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should be covered within the protection scope of this utility model.

Claims

1. A composite molding die for cold bonding of rubber and metal parts, characterized in that, The device includes an upper mold, a middle mold, and a lower mold. The upper and lower molds are respectively located on the upper and lower sides of the middle mold. The upper mold has several cavities, each with a venting and weight-reducing hole. Each venting and weight-reducing hole has a contact groove cavity on both sides. The middle mold has a stepped hole at the top, a positioning through hole in the middle, and a large-sized inner hole at the bottom. The upper part of the metal part is located in the stepped hole. The contact groove cavity contacts and fits with the upper surface of the metal part, providing pressure to the upper rubber part of the metal part. The raised frustum at the top of the metal part is located in the venting and weight-reducing hole of the upper mold. The lower rubber part on the upper side of the metal part contacts and fits with the step of the stepped hole. The middle part of the metal part is a positioning section. The surface of the positioning section has a positioning surface, which fits with the positioning through hole to position the metal part. The lower part of the metal part is a long rod section, located in the large-sized inner hole. The bottom of the long rod section has a lower end face, which contacts and fits with the upper surface of the lower mold.

2. The composite molding die for cold bonding of rubber and metal parts according to claim 1, characterized in that, The upper mold and the middle mold are fitted together with a clearance through two large locating pins.

3. The composite molding die for cold bonding of rubber and metal parts according to claim 1, characterized in that, The lower mold has a planar structure and is fitted with the middle mold with a clearance through two locating pins on opposite corners.

4. The composite molding die for cold bonding of rubber and metal parts according to claim 1, characterized in that, The lower mold is equipped with a misalignment positioning pin, which mates with the misalignment positioning pin hole on the middle mold.

5. The composite molding die for cold bonding of rubber and metal parts according to claim 1, characterized in that, The upper mold, middle mold, and lower mold form a closed cavity.

6. The composite molding die for cold bonding of rubber and metal parts according to claim 1, characterized in that, The upper end of the side of the middle mold has an L-shaped stepped structure, which forms a mold opening groove with the lower end face of the upper mold, used to open the upper mold.

7. The composite molding die for cold bonding of rubber and metal parts according to claim 1, characterized in that, The upper end of the side of the lower mold has an L-shaped stepped structure, which forms a mold opening groove II with the lower end face of the middle mold, used to open the lower mold.

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