A molding die for a composite gasket

Abstract

The present application relates to sealing forming die technical field, specifically relates to a kind of composite sealing washer's forming die, including upper die mechanism and lower die mechanism;The upper die mechanism includes upper die and upper die core;The lower die mechanism includes lower die, first lower die core, second lower die core and third lower die core, the second lower die core and third lower die core can be vertically slid relative to lower die;First spring is equipped between the second lower die core and lower die;Second spring is equipped between the second lower die core and third lower die core;Upper die, upper die core, lower die and first lower die core jointly enclose forming cavity, the upper die core, first lower die core and second lower die core jointly enclose excess material cavity, and the excess material cavity is communicated with forming cavity.The composite sealing washer's forming die of the present application adopts the die device structure of direct moulding, cancels the flow channel that occupies a large number of glue resources, improves economic benefit under the premise of guaranteeing composite sealing washer product quality.

Description

Technical Field

[0001] This invention relates to the field of sealing component molding die technology, specifically to a molding die for a composite sealing gasket. Background Technology

[0002] The composite gasket is composed of a reinforcing structure (rubber) and a matrix material (metal). The rubber mainly serves to dampen vibrations and reduce deformation, while the metal mainly serves to transfer and balance loads. CN208900715U discloses a sealing composite gasket, including a gasket body. The gasket body includes a metal matrix and a non-metallic sealing body. The metal matrix is ​​a cylinder with an embedded stepped through hole. The non-metallic sealing body is a cylinder with a protruding stepped through hole in the middle. The outer wall of the protruding hole of the non-metallic sealing body fits tightly with the inner wall of the upper hole of the stepped through hole in the metal matrix.

[0003] Composite sealing gaskets are generally injection molded using a vulcanizing machine. Figure 1 This is a structural diagram of an existing composite sealing gasket mold, including an upper mold 12 with a glue injection plug, a middle mold 13 with a glue injection cylinder, and a lower mold 14. A cavity 9 is formed between the middle mold 13 with the glue injection cylinder and the lower mold 14. Glue injection channels 15, 16, and 17, which communicate with the cavity 9, are provided between the upper mold 12 with the glue injection plug and the middle mold 13 with the glue injection cylinder, inside the middle mold 13 with the glue injection cylinder, and between the middle mold 13 with the glue injection cylinder and the lower mold 14. To ensure the glue injection effect and smooth operation, as well as sufficient strength and service life of the mold, the length and cross-sectional dimensions of the glue injection channels are relatively large. Specifically, in order to smoothly remove the rubber material between the upper mold 12 with the injection plug and the middle mold 13 with the injection cylinder after vulcanization, the thickness of the injection channel 15 cannot be too small; otherwise, the rubber material will break during the removal process, requiring multiple removals and resulting in low operating efficiency. In order to ensure that the middle mold 13 with the injection cylinder has sufficient rigidity to prevent deformation during vulcanization and pressurization, the middle mold 13 with the injection cylinder needs to have sufficient thickness, which results in a relatively long injection channel 16. In order to prevent the rubber material in the injection channel from solidifying too quickly due to high temperature, causing the rubber material to fail to fill the cavity 9, the cross-sectional dimensions of the injection channels 15, 16, and 17 cannot be too small.

[0004] Existing injection molds have been used in the sealing industry for decades. In the production of composite gaskets, the vast majority of the adhesive is consumed in the adhesive flow channel and cannot be effectively converted into finished products. Statistics show that, using existing molds, the effective amount of adhesive used in each composite gasket is only about 15% of the original preform, while the remaining 85% is wasted, resulting in high production costs. Summary of the Invention

[0005] The purpose of this invention is to provide a molding die for composite sealing gaskets, which adopts a direct molding die structure, eliminating the flow channel that occupies a large amount of rubber material, thereby improving economic efficiency while ensuring the quality of composite sealing gasket products.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a molding die for a composite sealing gasket, comprising an upper die mechanism and a lower die mechanism; the upper die mechanism includes an upper die and an upper die core, the upper die core being disposed inside the upper die; the lower die mechanism includes a lower die, a first lower die core, a second lower die core, and a third lower die core, the first lower die core, the second lower die core, and the third lower die core are all disposed inside the lower die, the first lower die core is fixedly installed at the top of the lower die, and the second lower die core and the third lower die core are both capable of vertically sliding relative to the lower die. The lower mold core is located above the third lower mold core; a first spring is provided between the second lower mold core and the lower mold, and the first spring exerts a vertically downward force on the second lower mold core; a second spring is provided between the second lower mold core and the third lower mold core, and the second spring exerts a vertically upward force on the second lower mold core; the outer circular surface of the second lower mold core slides in fit with the inner circular surface of the first lower mold core; the upper mold, upper mold core, lower mold, and first lower mold core together form a forming cavity, and the upper mold core, first lower mold core, and second lower mold core together form a material reserve cavity, which is connected to the mold cavity.

[0007] The working process of the molding die for the composite sealing gasket of the present invention is as follows:

[0008] S1. The upper mold mechanism and the lower mold mechanism open the mold, and the metal ring (metal base) is placed into the cavity by the tooling;

[0009] S2. The adhesive is placed in the waste material cavity through the stencil tool. In order to avoid waste due to insufficient adhesive, the unit consumption of the placed adhesive will be slightly greater than the effective usage amount.

[0010] S3. Vulcanization and mold closing: The vulcanizing machine applies pressure to the third lower mold core. The third lower mold core, through the second spring, applies an upward force to the second lower mold core. The second lower mold core uses a piston principle to squeeze the rubber material, allowing it to enter the cavity. Excess rubber material can be slightly moved downward by the elastic force of the first spring, ensuring a certain reaction force, to create clearance space for the rubber material and prevent product overflow. The rubber material is vulcanized and molded by the pre-set temperature, pressure, and time of the vulcanizing machine.

[0011] S4. After vulcanization, the upper mold mechanism separates from the lower mold mechanism, and the product is removed (small tooling can be used); with the help of the elastic force of the first spring, the second lower mold core overcomes the resistance of the rubber material in the residual material cavity and is successfully reset. One vulcanization cycle is completed.

[0012] Compared with the prior art, the beneficial effects of the molding die of the composite sealing gasket of the present invention are as follows: (1) The present invention abandons the original injection structure and adopts the mold device structure of direct molding, which eliminates the flow channel that occupies a large amount of rubber material resources, and only a small amount of rubber material is wasted in the residual material cavity. Therefore, compared with the existing injection mold, the molding die of the composite sealing gasket of the present invention can save a lot of rubber material when producing the same product, resulting in huge economic benefits. (2) During the vulcanization molding process, the first spring and the second spring work together to effectively balance the vulcanization pressure, which can not only ensure the clamping force of the cavity, so that the rubber material fills the entire cavity and avoids insufficient rubber, but also absorb the reaction force generated by the excess rubber in the cavity, preventing the excess rubber material from overflowing the metal ring and causing "overflow" and forming waste. Therefore, the molding die of the composite sealing gasket of the present invention, under the premise of ensuring that the productivity remains basically unchanged, only needs to increase the processing input of the mold device, and the other production process links remain basically unchanged, so as to obtain the same quality composite sealing gasket product. (3) The upper mold core and the first lower mold core are both parts that apply pressure to the metal ring, and are more prone to wear. In this invention, the upper mold and the first lower mold core are manufactured separately and assembled with the upper mold and the lower mold respectively. When the upper mold core and the first lower mold core are worn, they are easy to replace. Moreover, the upper mold core and the first lower mold core can be quenched separately, avoiding the mold deformation caused by the overall quenching of the large plate mold. (4) The molding mold of the composite sealing gasket of this invention adopts a two-opening mold structure, which is one less layer than the existing composite sealing gasket mold, and is more conducive to matching different specifications of vulcanizing equipment.

[0013] Furthermore, the force of the second spring is greater than that of the first spring.

[0014] Furthermore, the upper mold core, the first lower mold core, the second lower mold core, and the third lower mold core are made of Cr12MoV.

[0015] Furthermore, the upper mold core can slide vertically relative to the upper mold.

[0016] Furthermore, both the upper mold core and the first lower mold core are subjected to quenching treatment. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of an existing composite sealing gasket mold.

[0018] Figure 2 This is a schematic diagram of the molding die for the composite sealing gasket in Example 1.

[0019] Wherein: 1-First lower mold core, 2-Second lower mold core, 3-Third lower mold core, 4-Upper mold, 5-Upper mold core, 6-Lower mold, 7-First spring, 8-Second spring, 9-Cavity, 10-Excess material cavity, 12-Upper mold with injection plug, 13-Middle mold with injection cylinder, 14-Lower mold, 15, 16, 17-Injection channel. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings:

[0021] Example 1

[0022] Figure 2 Embodiment 1 of the present invention is shown. The molding die of the composite sealing gasket in this embodiment is matched with a two-opening vulcanizing machine for vulcanizing and molding the composite sealing gasket.

[0023] like Figure 2 As shown, a molding die for a composite sealing gasket includes an upper mold mechanism and a lower mold mechanism, which are capable of closing and separating the mold.

[0024] The upper mold mechanism includes an upper mold 4 and an upper mold core 5. The upper mold core 5 is vertically slidably disposed inside the upper mold 4. This structure is suitable for large-sized products. The upper mold core 5 can move downward a certain distance relative to the upper mold 4 to assist in product demolding. A retaining ring groove is provided near the upper end of the upper mold core 5 for installing a limiting retaining ring to prevent the upper mold core 5 from detaching from the upper mold 4.

[0025] The lower mold mechanism includes a lower mold 6, a first lower mold core 1, a second lower mold core 2, and a third lower mold core 3. The first lower mold core 1, the second lower mold core 2, and the third lower mold core 3 are all disposed inside the lower mold 6. The first lower mold core 1 is fixedly installed at the top of the lower mold 6. The second lower mold core 2 and the third lower mold core 3 can both slide vertically relative to the lower mold 6, with the second lower mold core 2 located above the third lower mold core 3. A first spring 7 is provided between the second lower mold core 2 and the lower mold 6, and the force exerted by the first spring 7 on the second lower mold core 2 is vertically downward. A second spring 8 is provided between the second lower mold core 2 and the third lower mold core 3, and the force exerted by the second spring 8 on the second lower mold core 2 is vertically upward.

[0026] The force values ​​of the second spring 8 and the first spring 7 are selected based on the second lower mold core 2 and the third lower mold core 3 (pressure displacement data). Specifically, in this embodiment, the first spring 7 is selected as a spring with a free length of 20mm to ensure more than 300,000 uses, and a force value of 31N / mm (3.2kgf / mm) is selected, characterized by a close-fitting length of 9mm; when the compression is 10mm, the load reaches 313N (32kgf). The second spring 8 is selected as a spring with a free length of 20mm to ensure more than 300,000 uses, and a force value of 122N / mm (12.5kgf / mm) is selected, characterized by a close-fitting length of 12.5mm; when the compression is 6.4mm, the load reaches 784N (80kgf).

[0027] For ease of assembly, the lower mold 6 consists of two modules, upper and lower, which are fixedly connected by bolts.

[0028] The outer circular surface of the second lower mold core 2 slides in contact with the inner circular surface of the first lower mold core 1.

[0029] The upper mold 4, upper mold core 5, lower mold 6 and first lower mold core 1 together form the cavity 9. The upper mold core 5, first lower mold core 1 and second lower mold core 2 together form the material surplus cavity 10. The material surplus cavity 10 is connected to the cavity 9.

[0030] The upper mold core 5, the first lower mold core 1, the second lower mold core 2, and the third lower mold core 3 are made of Cr12MoV.

[0031] To ensure that the upper mold core 5 and the first lower mold core 1 have sufficient hardness and service life, both the upper mold core 5 and the first lower mold core 1 are subjected to quenching treatment.

[0032] The working process of the molding die for the composite sealing gasket of the present invention is as follows:

[0033] S1. The upper mold mechanism and the lower mold mechanism open the mold, and the metal ring is placed into the cavity 9 by the tooling;

[0034] S2. The adhesive is placed into the waste material chamber 10 through the stencil tool. In order to avoid waste due to insufficient adhesive, the unit consumption of the placed adhesive will be slightly greater than the effective usage.

[0035] S3. Vulcanization and mold closing: The vulcanizing machine applies pressure to the third lower mold core 3. The third lower mold core 3 applies an upward force to the second lower mold core 2 through the second spring 8. The second lower mold core 2 uses the piston principle to squeeze the rubber material, allowing the rubber material to enter the cavity 9. Excess rubber material can be slightly moved downward by the elastic force of the first spring 7, ensuring a certain reaction force, to create clearance space for the rubber material and avoid product overflow. The rubber material is vulcanized and molded by the pre-set temperature, pressure, and time of the vulcanizing machine.

[0036] S4. After vulcanization, the upper mold mechanism separates from the lower mold mechanism, and the product is removed (small tooling can be used). During this process, the upper mold core 5 can move downward a certain distance relative to the upper mold 4 to assist in demolding the product. With the help of the elastic force of the first spring 7, the second lower mold core 2 overcomes the resistance of the rubber material in the residual material cavity 10 and is successfully reset. One vulcanization cycle is completed.

[0037] The molding die for the composite sealing gasket in this embodiment was internally developed and implemented in October 2021. Currently, an 80-cavity mold for the MW0005 composite sealing gasket has been manufactured, and trial production, small-batch production, and mass production have been completed, with a cumulative production of approximately 600,000 MW0005 composite sealing gaskets. Compared with existing injection molds, the molding die for the composite sealing gasket in this embodiment can save approximately 75% of the adhesive material when producing the same product, resulting in significant economic benefits.

[0038] Example 2

[0039] The difference from Embodiment 1 is that the upper mold core 5 is fixedly set inside the upper mold 4 by interference fit. This structure is suitable for small-sized products. Only small tooling is needed to assist in demolding, and the upper mold core 5 is not required to eject the product.

[0040] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A molding die for a composite sealing gasket, characterized in that: The system includes an upper mold mechanism and a lower mold mechanism; the upper mold mechanism includes an upper mold (4) and an upper mold core (5), the upper mold core (5) being disposed inside the upper mold (4); the lower mold mechanism includes a lower mold (6), a first lower mold core (1), a second lower mold core (2), and a third lower mold core (3), the first lower mold core (1), the second lower mold core (2), and the third lower mold core (3) being disposed inside the lower mold (6), the first lower mold core (1) being fixedly installed at the top of the lower mold (6), the second lower mold core (2) and the third lower mold core (3) being able to slide vertically relative to the lower mold (6), the second lower mold core (2) being located above the third lower mold core (3); the second lower mold core (2) and the third lower mold core (3) being able to slide vertically relative to the lower mold (6). A first spring (7) is provided between the lower molds (6), and the force exerted by the first spring (7) on the second lower mold core (2) is vertically downward; a second spring (8) is provided between the second lower mold core (2) and the third lower mold core (3), and the force exerted by the second spring (8) on the second lower mold core (2) is vertically upward; the outer circular surface of the second lower mold core (2) slides with the inner circular surface of the first lower mold core (1); the upper mold (4), the upper mold core (5), the lower mold (6) and the first lower mold core (1) together form a cavity (9), and the upper mold core (5), the first lower mold core (1) and the second lower mold core (2) together form a material reserve cavity (10), and the material reserve cavity (10) is connected to the cavity (9).

2. The molding die for the composite sealing gasket as described in claim 1, characterized in that, The force of the second spring (8) is greater than that of the first spring (7).

3. The molding die for the composite sealing gasket as described in claim 1, characterized in that, The upper mold core (5), the first lower mold core (1), the second lower mold core (2) and the third lower mold core (3) are made of Cr12MoV.

4. The molding die for the composite sealing gasket as described in any one of claims 1 to 3, characterized in that, The upper mold core (5) can slide vertically relative to the upper mold (4).

5. The molding die for the composite sealing gasket as described in any one of claims 1 to 3, characterized in that, Both the upper mold core (5) and the first lower mold core (1) are hardened.

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