A full protection double material composite sealing ring

Abstract

The present invention discloses a full-protection dual-material composite seal ring, which relates to the field of seal ring production, and includes a rubber O-ring, which is a rubber semi-finished product. The full-protection dual-material composite seal ring can well realize the surface coating of the O-type rubber seal ring with a polytetrafluoroethylene film through the production method of the present invention, thereby solving the problems of difficult molding and low qualified rate of such seal rings from the production process aspect, and firstly bonding and vulcanizing the polytetrafluoroethylene ring and the rubber ring to form an integral body, and then can be processed by a CNC machine, which greatly guarantees the use tolerance of the size, thereby solving the problem that the traditional semi-protection dual-material composite seal ring manufacturing method has certain limitations on size adjustment by the molding process of bonding two semi-finished products by bonding glue.

Description

Technical Field

[0001] The invention relates to the field of sealing ring production, in particular to a full-protection double-material composite sealing ring. Background Art

[0002] With the development of society, especially the progress of science and technology, the rapid development of social productivity has been greatly promoted, especially the development of information industrialization, which has led to a qualitative leap in society. In the high-speed development of society, equipment automation and intelligence have played a strong supporting role in the progress and development of society. With the continuous improvement of the level of modern industrial manufacturing, energy consumption has become the main factor in measuring the cost performance of industrial products, especially for products in cutting-edge fields such as aviation and aerospace, which have put forward demanding technical requirements. Rubber products, as an important part of industrial products, are widely used in many fields with their unique high elastic properties. The sealing field is a rubber product. In the important application occasions, in the field of sealing, the friction coefficient between rubber seals and metal equipment determines the service life of seals and the performance of equipment to a large extent. The friction coefficient between traditional rubber seals and metals is relatively large. Due to mechanical wear and the swelling effect of solvents on rubber products, the performance of seals is damaged, resulting in seal failure and affecting the performance of equipment. Therefore, we considered combining highly wear-resistant and self-lubricating polytetrafluoroethylene film with pure rubber structure seals to reduce the friction coefficient between seals and metal equipment, thereby reducing the heat and wear generated by friction, so as to improve the performance of equipment and the service life of seals.

[0003] However, in today's molding process of fully protected dual-material composite sealing rings, the traditional method is to place the pre-prepared tetrafluoroethylene film and pure rubber O-ring into a vulcanized heating mold, and heat and bond them with adhesive. This setting is theoretically more accurate, but the stress, heat and demolding of the coating material directly affect the product's pass rate and wear-resistant quality coefficient, which makes the traditional molding process of bonding two semi-finished products with adhesives have certain limitations for size adjustment. Therefore, a fully protected dual-material composite sealing ring is proposed to solve this problem. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a fully protected dual-material composite sealing ring, which solves the problem that the traditional method of manufacturing a semi-protected dual-material composite sealing ring is a molding process in which two semi-finished products are bonded together by adhesive, which has certain limitations on size adjustment.

[0006] (II) Technical solution

[0007] To achieve the above purpose, the technical solution adopted by the present invention is: a full-protection dual-material composite sealing ring, including a rubber O-ring, the rubber O-ring is a rubber semi-finished product, the rubber O-ring is in the shape of a square sheet, a polytetrafluoroethylene ring is arranged inside the rubber O-ring, the size of the polytetrafluoroethylene ring is the size of the middle mold cavity, and the height of the polytetrafluoroethylene ring is 1 / 3 of the size of the middle mold cavity.

[0008] Preferably, the rubber O-ring is made of rubber material, and the rubber material includes chloroprene rubber, fluororubber, nitrile rubber, silicone rubber, silicone-fluororubber and natural rubber.

[0009] A method for producing a full-protection dual-material composite sealing ring comprises the following steps:

[0010] a1. Set the temperature of the flat plate vulcanizer to the temperature required for product vulcanization, and place the mold on the flat plate vulcanizer. Let the temperature of the mold reach the required temperature before performing the following operations.

[0011] a2. Place the polytetrafluoroethylene ring into the cavity of the bottom mold.

[0012] a3. Cover the upper mold of the mold.

[0013] a4. Place the weighed rubber material into the upper mold cavity, and then cover it with the upper mold cover.

[0014] a5. Place the assembled mold on a flat vulcanizer for hot vulcanization molding to obtain a semi-finished product.

[0015] a6. For the semi-finished product in the fifth step, the remaining rubber in the inner hole is repaired and the outer diameter is precisely processed by CNC machine to ensure the size of the product.

[0016] Preferably, the temperature required for vulcanization is 140-180°C and the time is 5-30 minutes, and the temperature required for the mold is 140-180°C and the time is 5-30 minutes.

[0017] (III) Beneficial effects

[0018] The beneficial effects of the present invention are:

[0019] The fully protected dual-material composite sealing ring can well realize the coating of the polytetrafluoroethylene film on the surface of the O-type rubber sealing ring through the production method of the present invention, thereby solving the problems of difficult molding and low qualified rate of such sealing rings from the production process aspect. The polytetrafluoroethylene ring and the rubber ring are firstly bonded and vulcanized to form an integral body, and then can be processed and formed by a numerical control machine, thereby greatly ensuring the use tolerance of the size, thereby controlling the product tolerance to within the range of 0.05mm, and the accuracy exceeds the tolerance of ordinary O-rings between 0.15mm-0.3mm, thereby being suitable for the molding production of fully protected dual-material composite sealing rings with a larger size range, thereby solving the problem that the traditional method for manufacturing a semi-protected dual-material composite sealing ring has certain limitations on size adjustment by the molding process of bonding two semi-finished products by adhesive glue. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the process of forming the O-type sealing ring wrapped with polytetrafluoroethylene film of the present invention;

[0021] Figure 2 It is a schematic diagram of the process of forming an O-type sealing ring wrapped with a polytetrafluoroethylene film according to the present invention;

[0022] Figure 3 This is a schematic diagram of the top cross-sectional structure of the O-type sealing ring wrapped with polytetrafluoroethylene film of the present invention;

[0023] Figure 4 This is a schematic diagram of the side cross-sectional structure of the O-type sealing ring wrapped with polytetrafluoroethylene film of the present invention;

[0024] Figure 5 It is a schematic diagram of the top view of the cross-sectional structure of the O-type sealing ring containing a polytetrafluoroethylene film of the present invention;

[0025] Figure 6 The figure is a schematic diagram of the side cross-sectional structure of the O-type sealing ring wrapped with polytetrafluoroethylene film of the present invention.

[0026] In the figure: 1 upper mold cover, 2 upper mold, 3 middle mold, 4 bottom mold, 5 polytetrafluoroethylene ring, 6 rubber O-ring. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figure 1-4As shown, the present invention provides a technical solution: a full-protection dual-material composite sealing ring, including a rubber O-ring 6, the rubber O-ring 6 is a rubber semi-finished product, the rubber O-ring 6 is in the shape of a square sheet, a polytetrafluoroethylene ring 5 is arranged in the rubber O-ring 6, the size of the polytetrafluoroethylene ring 5 is the size of the middle mold 3 cavity, and the height of the polytetrafluoroethylene ring 5 is 1 / 3 of the size of the middle mold 3 cavity.

[0029] The material of the rubber O-ring 6 is rubber material, and the rubber material includes chloroprene rubber, fluororubber, nitrile rubber, silicone rubber, silicone fluororubber and natural rubber.

[0030] A method for producing a full-protection dual-material composite sealing ring comprises the following steps:

[0031] a1. Set the temperature of the flat plate vulcanizer to the temperature required for product vulcanization, and place the mold on the flat plate vulcanizer. Let the temperature of the mold reach the required temperature before performing the following operations.

[0032] a2. Place the polytetrafluoroethylene ring 5 into the mold cavity formed by the bottom mold 4 and the middle mold 3.

[0033] a3. Cover the upper mold 2 of the mold.

[0034] a4. Place the weighed rubber material into the cavity of the upper mold 2, and then cover it with the upper mold cover 1.

[0035] a5. Place the assembled mold on a flat vulcanizer for hot vulcanization molding to obtain a semi-finished product.

[0036] a6. For the semi-finished product in the fifth step, the remaining rubber in the inner hole is repaired and the outer diameter is precisely processed by CNC machine to ensure the size of the product.

[0037] The temperature required for vulcanization is 140~180°C and the time is 5~30 minutes. The temperature that the mold needs to reach is 140~180°C and the time is 5~30 minutes.

[0038] The embodiments of the present invention are:

[0039] Embodiment 1

[0040] like Figure 1 As shown, the production method of the O-type rubber sealing ring wrapped with polytetrafluoroethylene film has the following specific steps:

[0041] Step 1: Set the temperature of the flat vulcanizer to the temperature required for product vulcanization, and place the mold on the flat vulcanizer. Let the temperature of the mold reach the required temperature before performing the following operations.

[0042] Step 2: Place the polytetrafluoroethylene ring 5 into the mold cavity formed by the bottom mold 4 and the middle mold 3.

[0043] Step 3: Cover with upper mold 2.

[0044] Step 4: Place the weighed rubber material into the cavity of the upper mold 2 and cover it with the upper mold cover 1.

[0045] Step 5: Place the assembled mold on a flat vulcanizer for hot vulcanization molding to obtain a semi-finished product.

[0046] Step 6: The inner hole angle of the semi-finished product in step 5 is repaired, and the outer diameter is processed by CNC machine to ensure the precise size tolerance of the product is 0.05mm.

[0047] The shape of the rubber semi-finished product is sheet-like, and the height of the polytetrafluoroethylene rubber ring is 1 / 3 of the size of the middle mold cavity 3. The external conditions required for molding: the rubber hot vulcanization condition is 140-180°C, and the time is 5-30 minutes.

[0048] The rubber materials include: chloroprene rubber, fluororubber, nitrile rubber, silicone rubber, silicone fluororubber and natural rubber.

[0049] Embodiment 2

[0050] like Figure 2 As shown, the production method of the O-type rubber sealing ring with polytetrafluoroethylene film is as follows:

[0051] Step 1: Set the temperature of the flat vulcanizer to the temperature required for product vulcanization, and place the mold on the flat vulcanizer. Let the temperature of the mold reach the required temperature before performing the following operations.

[0052] Step 2: Place the polytetrafluoroethylene ring 5 into the mold cavity formed by the bottom mold 4 and the middle mold 3.

[0053] Step 3: Cover the upper mold 2 of the mold.

[0054] Step 4: Place the weighed rubber material into the cavity of the upper mold 2 and cover it with the upper mold cover 1.

[0055] Step 5: Place the assembled mold on a flat vulcanizer for hot vulcanization molding to obtain a semi-finished product.

[0056] Step 6: The outer diameter of the semi-finished product in step 5 is trimmed and the inner diameter is processed by CNC machine to ensure the size of the product accurately.

[0057] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A full protection dual material composite seal ring, comprising a rubber O-ring (6), characterized in that: The rubber O-ring (6) is a rubber semi-finished product. The shape of the rubber O-ring (6) is a square sheet. A polytetrafluoroethylene ring (5) is arranged inside the rubber O-ring (6). The size of the polytetrafluoroethylene ring (5) is the same as the size of the cavity of the middle mold (3). The height of the polytetrafluoroethylene ring (5) is 1 / 3 of the size of the cavity of the middle mold (3). The rubber O-ring (6) is made of rubber material, and the rubber material includes chloroprene rubber, nitrile rubber, silicone fluororubber and natural rubber; A method for producing a full-protection dual-material composite sealing ring comprises the following steps: a1. Set the temperature of the flat vulcanizer to the temperature required for product vulcanization, and place the mold on the flat vulcanizer. Let the temperature of the mold reach the required temperature before performing the following operations; a2. Place the polytetrafluoroethylene ring (5) into the mold cavity formed by the bottom mold (4) and the middle mold (3); a3, cover the upper mold (2) of the mold; a4. Place the weighed rubber material into the cavity of the upper mold (2), and then cover the upper mold cover (1); a5. Place the assembled mold on a flat vulcanizer for hot vulcanization molding to obtain a semi-finished product; a6. Repair the remaining rubber in the inner hole of the semi-finished product of a5, and use CNC machine tools to process its outer diameter to ensure the size of the product; The temperature required for vulcanization is 140-180°C and the time is 5-30 minutes, and the temperature required for the mold is 140-180°C and the time is 5-30 minutes.

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