Air bag type vulcanizing mold and method for bonding test of tire calendered cord fabric

Abstract

The invention provides an air bag type vulcanization mold and method for a tire calendering cord fabric bonding test, and belongs to the technical field of tire production, the air bag type vulcanization mold comprises a mold frame, the mold frame is of a rectangular frame structure defined by square steel, and an air inlet pipe is fixedly connected to the outer side wall of one side of the mold frame; an upper sealing gasket covers the top of the mold frame, a lower sealing gasket covers the bottom of the mold frame, an upper cover plate is arranged above the upper sealing gasket, a lower cover plate is arranged below the lower sealing gasket, and independent vulcanization units for placing samples are formed between the upper sealing gasket and the upper cover plate and between the lower sealing gasket and the lower cover plate. The vulcanization requirements of cord fabrics with different thicknesses can be met, a plurality of samples can be vulcanized at a time, and the test efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of tire manufacturing technology, and in particular relates to an airbag-type vulcanizing mold and method for tire calendering cord bonding test. Background Technology

[0002] Tire calendered cord is a key reinforcing material in the tire carcass, and its interfacial adhesion performance with the rubber matrix has a decisive impact on tire durability and high-speed driving safety. Tire cord adhesion testing is an important verification method for evaluating the interfacial adhesion strength between the cord and rubber, quantifying the adhesion effect by measuring the force required to separate the two cord layers.

[0003] This experiment requires strict control of vulcanization conditions and sample preparation processes to ensure the accuracy, repeatability, and stability of the data. Studying the adhesive properties of tire cord fabric is of great significance for optimizing tire manufacturing processes and improving tire service life.

[0004] In the tire calendering cord bonding test, vulcanized samples were prepared using a vulcanization mold. First, the cut lower layer rubber sheet was accurately placed into the lower cavity of the mold, the cord was placed on the rubber sheet, the upper layer rubber sheet was placed on the cord and the lower layer rubber, the mold cover was closed, and the closed sample was placed into the vulcanizing machine for vulcanization at the set temperature, pressure and time. After vulcanization, the sample was cooled and removed.

[0005] Because there are many specifications and models of tires, and the thickness of the cord fabric varies greatly, the above method requires the preparation of molds of different sizes to meet the vulcanization requirements of cord fabrics of different thicknesses. Moreover, the existing molds can only vulcanize one sample at a time, which affects the efficiency of the test. Summary of the Invention

[0006] In view of the defects or deficiencies in the prior art, the present invention provides an airbag type vulcanization mold and method for tire calendered cord bonding test, which can meet the vulcanization requirements of cords of different thicknesses and can vulcanize multiple samples at one time, thus improving the test efficiency.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, embodiments of the present invention provide an airbag-type vulcanizing mold for tire calendering cord bonding tests, comprising a mold frame, wherein the mold frame is a rectangular frame structure enclosed by square steel, and an air inlet pipe is fixedly connected to one outer side wall of the mold frame. The mold frame is covered with an upper sealing gasket on top and a lower sealing gasket on bottom. An upper cover plate is provided above the upper sealing gasket and a lower cover plate is provided below the lower sealing gasket. An independent vulcanization unit for placing the sample is formed between the upper sealing gasket and the upper cover plate and between the lower sealing gasket and the lower cover plate.

[0008] Furthermore, the mold frame is made of four square steel bars welded together end to end.

[0009] Furthermore, the air intake pipe penetrates the side wall of the mold frame and is connected to the interior of the mold frame.

[0010] Furthermore, a quick-connect fitting is fixedly connected to the end of the air intake pipe away from the mold frame for connection to an air compressor.

[0011] Furthermore, the upper sealing plate covers the top opening of the mold frame, and the lower sealing gasket covers the bottom opening of the mold frame, forming a sealing cavity between the upper sealing gasket, the lower sealing gasket, and the mold frame.

[0012] Furthermore, the top and bottom surfaces of the mold frame are provided with fixing grooves, and the outer edge of the bottom surface of the upper sealing point and the outer edge of the top surface of the lower sealing gasket are provided with fixing blocks, which are adapted to the fixing grooves.

[0013] Furthermore, the fixing blocks on the upper and lower sealing gaskets are respectively embedded in the fixing grooves on the top and bottom surfaces of the mold frame to fix the upper and lower sealing gaskets.

[0014] Furthermore, the upper cover plate is larger than the upper sealing gasket, and the upper cover plate is arranged parallel to the upper sealing gasket.

[0015] Furthermore, the lower cover plate is larger than the lower sealing gasket, and the lower cover plate is arranged parallel to the lower sealing gasket.

[0016] Secondly, embodiments of the present invention provide a method for testing the bonding of tire calendered ply fabric, utilizing an air-cushion type vulcanizing mold for testing tire calendered ply fabric bonding as described above, comprising the following steps: First, cut several samples of the same size from the tire metal cord fabric in the direction perpendicular to the cord, ensuring that each sample has the same number of steel cords. Glue two samples together and wrap them tightly. Put the wrapped samples into the airbag mold. Place the same number of samples in each of the upper and lower independent vulcanization units. The samples are parallel to each other and spaced at a set distance. The airbag mold containing the sample is placed on a vulcanizing machine at a suitable temperature. The air pipe of the air compressor is connected to the air inlet pipe of the mold frame by quick insertion. The mold closing pressure of the vulcanizing machine is adjusted to the set value. After the mold is closed, compressed air at the set pressure is introduced. The sample is pressurized by the sealing gasket. After the vulcanizing machine is in place, the sample is vulcanized. After vulcanization, the sample is removed and cooled for a set time. The cooled sample is then placed on a tensile testing machine for tensile testing.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention features a mold frame with an air inlet pipe fixedly connected to the outer wall of one side. The air inlet pipe is connected to the interior of the mold frame, and an air compressor is connected to the air inlet pipe to introduce compressed gas into the mold frame. The compressed gas enters the sealed cavity through the air inlet pipe, forming an airbag-like structure. The sealing gaskets on the upper and lower sides of the sealed cavity pressurize the samples on both sides. After the vulcanizing machine closes the mold, it vulcanizes the samples. On the one hand, it ensures that the pressure is applied evenly from all sides of the sample, resulting in a more consistent and reliable vulcanization effect and test data. On the other hand, by providing uniform and adaptive air pressure, it overcomes the limitations of traditional fixed cavity molds on sample thickness, and can be compatible with everything from ultra-thin bicycle tire cord fabric (0.5mm) to thick engineering machinery tire cord fabric (4.0mm), achieving "one mold for multiple uses".

[0018] 2. This invention presents a unique dual-station design by setting sealing gaskets at both the top and bottom of the mold frame. Samples can be placed on the sealing gaskets at both the top and bottom of the mold frame, and cover plates are added to the samples on both sides of the mold frame, thereby achieving simultaneous vulcanization of two sets of samples, increasing the sample volume of a single vulcanization by 100%, and greatly improving testing efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the side structure of the airbag-type vulcanizing mold in Embodiment 1 of the present invention; Figure 2 This is a diagram showing the positional relationship between the sample and the mold frame in Embodiment 2 of the present invention; The components are: 1. Mold frame; 2. Air inlet pipe; 3. Upper sealing gasket; 4. Lower sealing gasket; 5. Sealing cavity; 6. Fixing groove; 7. Fixing block; 8. Upper cover plate; 9. Lower cover plate; 10. Sample. Detailed Implementation

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

[0021] Example 1 A typical embodiment of the present invention, such as Figure 1 As shown, an airbag-type vulcanizing mold for tire calendering cord bonding test includes a mold frame 1, which is a rectangular frame structure formed by square steel bars. Specifically, the mold frame 1 is welded together from four square steel bars end to end. An air inlet pipe 2 is fixedly connected to the outer wall of one side of the mold frame 1. The air inlet pipe 2 is set perpendicular to the outer wall of the mold frame 1, penetrates the side wall of the mold frame 1, and communicates with the inside of the mold frame 1. A quick-connect connector is fixedly connected to the end of the air inlet pipe 2 away from the mold frame 1, which can be connected to an air compressor through quick-connection to introduce compressed air into the mold frame 1.

[0022] The top of the mold frame 1 is covered with an upper sealing gasket 3, which can completely cover the top opening of the mold frame 1 and seal the top opening of the mold frame 1. The bottom of the mold frame 1 is covered with a lower sealing gasket 4, which can completely cover the bottom opening of the mold frame 1 and seal the bottom opening of the mold frame 1. Thus, a sealed cavity 5 is formed between the upper sealing gasket 3, the lower sealing gasket 4 and the mold frame 1. Compressed air enters the sealed cavity 5 through the air inlet pipe 2. The upper sealing gasket 3 and the lower sealing gasket 4 can seal the compressed gas.

[0023] In this embodiment, both the upper sealing gasket 3 and the lower sealing gasket 4 are made of high-temperature resistant materials, which are not easily deformed at high temperatures and are suitable for tire calendered cord bonding tests.

[0024] Furthermore, fixing grooves 6 are provided on the top and bottom periphery of the mold frame 1. Fixing blocks 7 are provided on the outer edge of the bottom surface of the upper sealing gasket 3 and the outer edge of the top surface of the lower sealing gasket 4. The fixing blocks 7 are adapted to the fixing grooves 6. When the upper sealing gasket 3 and the lower sealing gasket 4 are placed on the upper and lower sides of the mold frame 1 respectively, the fixing blocks 7 on the upper sealing gasket 3 and the lower sealing gasket 4 can be embedded into the fixing grooves 6 on the top and bottom surfaces of the mold frame 1 respectively, thereby fixing the upper sealing gasket 3 and the lower sealing gasket 4 and preventing the upper sealing gasket 3 and the lower sealing gasket 4 from moving and affecting the normal sealing of the compressed gas.

[0025] An upper cover plate 8 is provided above the upper sealing gasket 3. The size of the upper cover plate 8 is larger than that of the upper sealing gasket 3, and the upper cover plate 8 is set parallel to the upper sealing gasket 3. A lower cover plate 9 is provided below the lower sealing gasket 4. The size of the lower cover plate 9 is larger than that of the lower sealing gasket 4, and the lower cover plate 9 is set parallel to the lower sealing gasket 4. Both the upper cover plate 8 and the lower cover plate 9 are made of steel plates. Independent vulcanization units are formed between the upper sealing gasket 3 and the upper cover plate 8, and between the lower sealing gasket 4 and the lower cover plate 9. The sample 10 is placed in the vulcanization unit to vulcanize the sample 10.

[0026] In use, the upper sealing gasket 3 is placed on top of the mold frame 1, and the lower sealing gasket 4 is placed on bottom of the mold frame 1. A sealed cavity 5 is formed between the upper sealing gasket 3, the lower sealing gasket 4 and the mold frame 1 to seal the compressed gas. The cord fabric bonding sample to be vulcanized (preferably 5 samples) is placed on the top surface of the upper sealing gasket 3, and then the upper cover plate 8 is placed on top of the sample 10. Similarly, the cord fabric bonding sample to be vulcanized is placed on the bottom surface of the lower sealing gasket 4, and the lower cover plate 9 is placed on the sample 10. Finally, the sample 10 is placed between the two cover plates and the two sealing gaskets, respectively. Two sets of sample 10 can be vulcanized at the same time. The unique dual-station design increases the sample volume of a single vulcanization by 100%, which greatly improves the testing efficiency.

[0027] The air compressor is connected to the air inlet pipe 2 via a quick-connect coupling. Compressed air enters the sealed cavity 5 through the air inlet pipe 2, forming an airbag-type structure. The sealing gaskets on the upper and lower sides of the sealed cavity 5 pressurize the samples 10 on both sides. After the vulcanizing machine closes the mold, it vulcanizes the samples 10.

[0028] Compressed air enters the entire mold frame 1 and applies pressure evenly from all sides to the central sealing gasket, thereby uniformly transmitting pressure to the sample 10. On the one hand, this ensures that the pressure is applied evenly from all sides of the sample 10, resulting in a more consistent and reliable vulcanization effect and test data. On the other hand, by providing uniform and adaptive air pressure, it overcomes the limitations of traditional fixed cavity molds on the thickness of the sample 10, and is compatible with everything from ultra-thin bicycle tire cord fabric (0.5mm) to thick engineering machinery tire cord fabric (4.0mm), achieving "one mold for multiple uses".

[0029] Example 2 This embodiment provides a method for testing the bonding of tire calendered cord fabric, utilizing a bladder-type vulcanizing mold for tire calendered cord fabric bonding as described in Embodiment 1, and includes the following steps: Cut 10 samples of 200mm × (20±1)mm each from the tire's metal cord fabric, perpendicular to the cord direction, ensuring each sample has the same number of steel cords. Wrap at least 30mm of aluminum foil around the end of each sample as a fixing point during vulcanization. Starting from the opposite direction of the aluminum foil, glue two pieces of fabric together (squeeze with your fingers to remove air between the fabrics). After gluing the two fabrics together, wrap the sample twice with polyester film to prevent movement between components and to prevent deformation of the rubber compound during vulcanization. To obtain good samples, the fabric must be tightly wrapped. This method involves wrapping transparent adhesive tape around three equidistant points on the sample. Place the wrapped samples into an airbag mold. Place 5 samples in each of the two independent vulcanization units, spaced 5mm apart and parallel to each other.

[0030] like Figure 2 As shown, samples 1 and 5 are used to ensure consistent pressure. They will have slight deformation and should be discarded. Alternatively, pre-vulcanized samples can be used, but they need to be the same thickness as the samples.

[0031] The airbag mold containing the sample is placed on a vulcanizing machine at a suitable temperature. The air hose of the compressed air equipment is connected to the air inlet pipe of the mold frame via a quick-connect method. The vulcanizing machine's mold closing pressure is 3MPa-4MPa (this pressure is used to ensure no compressed air leakage). To avoid damaging the mold and cover plate, the maximum mold closing pressure should be determined based on the material used. (The material of the airbag mold used in this invention is suitable for a mold closing pressure of 3MPa-4MPa.) Ensure no compressed air leakage and that the sealing gasket is not easily damaged. After mold closing, compressed air (pressure 8.5±0.5 bar) is introduced, and the sample is pressurized using the sealing gasket. After the vulcanizing machine is in place, the sample is vulcanized. When vulcanization is complete, the air pressure needs to be released before turning on the vulcanizing machine. The sample should be taken out and cooled for a set time. After cooling, the sample should be placed on the tensile testing machine for tensile testing.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A bladder-type vulcanizing mold for tire calendering cord bonding tests, characterized in that, Includes a mold frame, which is a rectangular frame structure formed by square steel bars, and an air inlet pipe is fixedly connected to one of the outer side walls of the mold frame. The mold frame is covered with an upper sealing gasket on top and a lower sealing gasket on bottom. An upper cover plate is provided above the upper sealing gasket and a lower cover plate is provided below the lower sealing gasket. An independent vulcanization unit for placing the sample is formed between the upper sealing gasket and the upper cover plate and between the lower sealing gasket and the lower cover plate.

2. The air-bag type vulcanizing mold for tire calendering cord bonding test as described in claim 1, characterized in that, The mold frame is made of four square steel bars welded together end to end.

3. The air-bag type vulcanizing mold for tire calendering cord bonding test as described in claim 1, characterized in that, The air intake pipe penetrates the side wall of the mold frame and is connected to the interior of the mold frame.

4. The air-bag type vulcanizing mold for tire calendering cord bonding test as described in claim 1, characterized in that, The end of the air intake pipe away from the mold frame is fixedly connected to a quick-connect fitting for connecting to an air compressor.

5. The air-bag type vulcanizing mold for tire calendering cord bonding test as described in claim 1, characterized in that, The upper sealing plate covers the top opening of the mold frame, and the lower sealing gasket covers the bottom opening of the mold frame, forming a sealing cavity between the upper sealing gasket, the lower sealing gasket, and the mold frame.

6. The air-bag type vulcanizing mold for tire calendering cord bonding test as described in claim 1, characterized in that, The mold frame has fixing grooves on the top and bottom sides, and fixing blocks are provided on the outer edge of the bottom surface of the upper sealing gasket and the outer edge of the top surface of the lower sealing gasket. The fixing blocks are adapted to the fixing grooves.

7. The air-bag type vulcanizing mold for tire calendering cord bonding test as described in claim 6, characterized in that, The fixing blocks on the upper and lower sealing gaskets are respectively embedded in the fixing grooves on the top and bottom surfaces of the mold frame to fix the upper and lower sealing gaskets.

8. The air-bag type vulcanizing mold for tire calendering cord bonding test as described in claim 1, characterized in that, The upper cover plate is larger than the upper sealing gasket, and the upper cover plate is set parallel to the upper sealing gasket.

9. The air-bag type vulcanizing mold for tire calendering cord bonding test as described in claim 1, characterized in that, The lower cover plate is larger than the lower sealing gasket, and the lower cover plate is set parallel to the lower sealing gasket.

10. A method for testing the bonding of tire calendered cord fabric, utilizing an air-cushion type vulcanizing mold for testing tire calendered cord fabric as described in any one of claims 1-9, characterized in that, Includes the following steps: First, cut several samples of the same size from the tire metal cord fabric in the direction perpendicular to the cord, ensuring that each sample has the same number of steel cords. Glue two samples together and wrap them tightly. Put the wrapped samples into the airbag mold. Place the same number of samples in each of the upper and lower independent vulcanization units. The samples are parallel to each other and spaced at a set distance. The airbag mold containing the sample is placed on a vulcanizing machine at a suitable temperature. The air pipe of the air compressor is connected to the air inlet pipe of the mold frame by quick insertion. The mold closing pressure of the vulcanizing machine is adjusted to the set value. After the mold is closed, compressed air at the set pressure is introduced. The sample is pressurized by the sealing gasket. After the vulcanizing machine is in place, the sample is vulcanized. After vulcanization, the sample is removed and cooled for a set time. The cooled sample is then placed on a tensile testing machine for tensile testing.

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