A stress detection device and method for rubber vulcanization process

Abstract

This invention proposes a stress detection device and method for the rubber vulcanization process. The detection device includes a heating chamber; the heating chamber is equipped with a support platform for fixing the sample, and the heating chamber wall is provided with a transparent viewing window facing the support platform; the sample includes sheet-shaped fully vulcanized rubber and sheet-shaped unvulcanized rubber samples (2) with different moments of inertia. The fully vulcanized rubber and unvulcanized rubber samples are bonded together over a large area to form a sheet-shaped sample assembly. When testing is performed, the heating chamber heats the sample assembly at the support platform to deform it, and the stress of the unvulcanized rubber during the vulcanization process is evaluated based on the degree of deformation. This invention can obtain information on the stress change of rubber materials during the vulcanization process under different processes by observing the deformation of fully vulcanized rubber caused by vulcanization stress, providing support for the production and design of rubber parts.

Description

Technical Field

[0001] This invention relates to the field of rubber vulcanization technology, and in particular to a stress detection device and method for the rubber vulcanization process. Background Technology

[0002] Rubber parts possess excellent elasticity and damping properties, enabling their application in various fields. During the manufacturing process, the rubber compound undergoes heat vulcanization to obtain high-performance rubber parts with three-dimensional cross-linking of molecular chains.

[0003] During the vulcanization process, cross-linking of rubber causes a shortening of the molecular chain spacing, resulting in rubber volume shrinkage and stress. In existing technologies, the vulcanization status of the rubber part in the mold is unknown during the vulcanization process, and the stress changes in the rubber are also unknown, which is detrimental to the production and process design of rubber parts. Summary of the Invention

[0004] This invention proposes a stress detection device and method for the rubber vulcanization process, which can obtain information on stress changes in rubber materials under different processes by observing the deformation of fully vulcanized rubber caused by vulcanization stress, thus providing support for the production and design of rubber parts.

[0005] The present invention adopts the following technical solution.

[0006] A stress detection device for rubber vulcanization process, the detection device includes a heating chamber (3); the heating chamber is provided with a support platform (6) for fixing the sample, and a transparent window (4) facing the support platform is provided on the wall of the heating chamber; the sample includes sheet-shaped fully vulcanized rubber (1) and sheet-shaped unvulcanized rubber sample (2) with different moments of inertia, the fully vulcanized rubber and the unvulcanized rubber sample are bonded together over a large area to form a sheet-shaped sample assembly, when the test is performed, the heating chamber heats the sample assembly at the support platform to deform it, and the stress of the unvulcanized rubber in the rubber vulcanization process is evaluated according to the degree of deformation.

[0007] The sheet-shaped fully vulcanized rubber (1) and the sheet-shaped unvulcanized rubber sample (2) have the same size specifications. The sheet-shaped unvulcanized rubber sample is located at the top of the sample assembly, and the sheet-shaped fully vulcanized rubber sample is located at the bottom of the sample assembly.

[0008] The sample assembly is in the shape of a long rectangular strip, and the fixed end (5) on one side of the sample assembly is fixed to the support platform.

[0009] The transparent window is made of a high-temperature resistant, light-transmitting material.

[0010] The transparent window is made of quartz glass.

[0011] The sheet-like fully vulcanized rubber is molded using rubber with a known moment of inertia.

[0012] The heating box is connected to an external electronic device (8) via a data cable (9) for control.

[0013] Next to the heating box is a camera (7) for recording the deformation process of the non-fixed part of the sample assembly; the electronic device is also connected to the camera via a data cable.

[0014] A method for detecting stress during the vulcanization process of rubber, using the aforementioned stress detection device for the vulcanization process of rubber, includes the following steps;

[0015] Step S1: Measure the moment of inertia of the fully vulcanized rubber (1), and denot it as I;

[0016] Step S2: Measure the elastic modulus of the fully vulcanized rubber (1) and record it as E;

[0017] Step S3: Measure the length of the fully vulcanized rubber (1) on the side adjacent to the transparent window, and record it as... l ;

[0018] Step S4: Control the heating chamber to set the temperature required for stress testing of the unvulcanized rubber sample (2), and record the deformation of the free end of the bond between the fully vulcanized rubber (1) and the unvulcanized rubber sample (2) during heating. The free end is the non-fixed end. Record the length of the free end from the platform as... d t ;

[0019] Step S5: Calculate the stress during the vulcanization process. The calculation formula is as follows:

[0020] .

[0021] The method is used for stress detection during the vulcanization process of high mechanical performance rubber parts; in step S4, the temperature of the heating process is gradually changed so that the temperature of each part of the unvulcanized rubber sample is uniformly raised.

[0022] This invention obtains information on stress changes in rubber materials during vulcanization under different processes by observing the deformation of fully vulcanized rubber caused by vulcanization stress, thus providing support for the production and design of rubber parts. Attached Figure Description

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0024] Appendix Figure 1 This is a schematic diagram of the detection device;

[0025] Appendix Figure 2 This is a flowchart of a method for stress testing of nitrile rubber during the vulcanization process at 150℃;

[0026] In the diagram: 1: Fully vulcanized rubber; 2: Unvulcanized rubber sample; 3: Heating chamber; 4: Transparent window; 5: Fixed end; 6: Support platform; 7: Camera; 8: Electronic equipment (computer); 9: Data cable. Detailed Implementation

[0027] As shown in the figure, a stress detection device for rubber vulcanization process is provided. The detection device includes a heating chamber 3. The heating chamber is provided with a support platform (6) for fixing the sample. A transparent window 4 facing the support platform is provided on the wall of the heating chamber. The sample includes sheet-shaped fully vulcanized rubber (1) with different moments of inertia and sheet-shaped unvulcanized rubber sample 2. The fully vulcanized rubber and unvulcanized rubber sample are bonded together over a large area to form a sheet-shaped sample assembly. When the test is performed, the heating chamber heats the sample assembly at the support platform to deform it. The stress of the unvulcanized rubber during the rubber vulcanization process is evaluated according to the degree of deformation.

[0028] The sheet-shaped fully vulcanized rubber 1 and the sheet-shaped unvulcanized rubber sample 2 have the same size specifications. The sheet-shaped unvulcanized rubber sample is located at the top of the sample assembly, and the sheet-shaped fully vulcanized rubber sample is located at the bottom of the sample assembly.

[0029] The sample assembly is in the shape of a long rectangular strip, and the fixed end 5 on one side of the sample assembly is fixed to the support platform.

[0030] The transparent window is made of a high-temperature resistant, light-transmitting material.

[0031] The transparent window is made of quartz glass.

[0032] The sheet-like fully vulcanized rubber is molded using rubber with a known moment of inertia.

[0033] The heating box is connected to an external electronic device 8 via a data cable 9 for control.

[0034] Next to the heating box is a camera (7) for recording the deformation process of the non-fixed part of the sample assembly; the electronic device is also connected to the camera via a data cable.

[0035] A method for detecting stress during the vulcanization process of rubber, using the aforementioned stress detection device for the vulcanization process of rubber, includes the following steps;

[0036] Step S1: Measure the moment of inertia of the fully vulcanized rubber 1, and record it as I;

[0037] Step S2: Measure the elastic modulus of the fully vulcanized rubber 1 and record it as E;

[0038] Step S3: Measure the length of the fully vulcanized rubber 1 on the side adjacent to the transparent window, and record it as... l; is considered as the contact length between sheet-like fully vulcanized rubber 1 and sheet-like unvulcanized rubber sample 2;

[0039] Step S4: Control the heating chamber to set the temperature required for stress testing of the uncured rubber sample 2, and record the deformation of the free end of the bond between the fully vulcanized rubber (1) and the uncured rubber sample 2 during heating. The free end is the non-fixed end. Record the length of the free end from the platform as... d t ;

[0040] Step S5: Calculate the stress during the vulcanization process. The calculation formula is as follows:

[0041] .

[0042] The method is used for stress detection during the vulcanization process of high mechanical performance rubber parts; in step S4, the temperature of the heating process is gradually changed so that the temperature of each part of the unvulcanized rubber sample is uniformly raised.

[0043] Example:

[0044] This embodiment is used for stress testing of nitrile rubber during the vulcanization process at 150℃, such as... Figure 2 As shown, it includes the following steps:

[0045] (a) The moment of inertia of fully vulcanized nitrile butadiene rubber is measured and denoted as I1;

[0046] (b) The elastic modulus of fully vulcanized nitrile butadiene rubber is measured and recorded as E1;

[0047] (c) The length of the fully vulcanized nitrile rubber is measured and recorded as follows: l 1;

[0048] (d) Set the heating chamber temperature to 150℃, record the deformation of the free end (non-fixed end) of the bond between the fully vulcanized and unvulcanized nitrile rubber samples, and record the length of the free end from the platform as . d t .

[0049] (e) Calculate the stress during the vulcanization process, as shown in the following formula:

[0050] stress

[0051] The above technical description is illustrated with reference to the accompanying drawings, which form a part of this application, and which show implementations according to the described embodiments. While these embodiments are described in sufficient detail to enable those skilled in the art to implement them, these embodiments are not limiting; thus, other embodiments can be used, and variations can be made without departing from the scope of the described embodiments. For example, the order of operations described in the flowcharts is not limiting, and thus the order of two or more operations illustrated in and described in the flowcharts can be changed according to several embodiments.

[0052] Furthermore, terminology is used in the above technical description to provide a thorough understanding of the described embodiments. However, excessive detail is not required to implement the described embodiments. Therefore, the above description of the embodiments is presented for illustrative and descriptive purposes. The embodiments presented in the above description, as well as the examples disclosed according to the embodiments, are provided separately to add context and aid in understanding the described embodiments. The above specification is not intended to be exhaustive or to limit the described embodiments to the precise form of this application. Based on the above teachings, several modifications, selections, and variations are possible. In some cases, well-known processing steps have not been described in detail to avoid unnecessarily affecting the described embodiments.

[0053] This application uses specific embodiments to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

[0054] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A stress detection device for the rubber vulcanization process, characterized in that: The testing device includes a heating chamber (3); the heating chamber is equipped with a support platform (6) for fixing the sample, and a transparent viewing window (4) facing the support platform is provided on the wall of the heating chamber; the sample includes sheet-shaped fully vulcanized rubber (1) and sheet-shaped unvulcanized rubber sample (2) with different moments of inertia. The fully vulcanized rubber and the unvulcanized rubber sample are bonded together over a large area to form a sheet-shaped sample assembly. When testing is performed, the heating chamber heats the sample assembly at the support platform to deform it, and the stress of the rubber vulcanization process of the unvulcanized rubber is evaluated according to the degree of deformation. The sheet-shaped fully vulcanized rubber (1) and the sheet-shaped unvulcanized rubber sample (2) have the same size specifications. The sheet-shaped unvulcanized rubber sample is located at the top of the sample assembly, and the sheet-shaped fully vulcanized rubber sample is located at the bottom of the sample assembly. The sample assembly is in the shape of a long rectangular strip, and the fixed end (5) on one side of the sample assembly is fixed to the support platform; the stress during the vulcanization process is calculated using the following formula: Moment of inertia I; elastic modulus E; length l of the vulcanized rubber adjacent to the transparent window; The length d of the distance from the free end of the bond between the fully vulcanized rubber and the unvulcanized rubber sample to the platform is... t .

2. The stress detection device for the rubber vulcanization process according to claim 1, characterized in that: The transparent window is made of a high-temperature resistant, light-transmitting material.

3. The stress detection device for the rubber vulcanization process according to claim 2, characterized in that: The transparent window is made of quartz glass.

4. The stress detection device for the rubber vulcanization process according to claim 1, characterized in that: The sheet-like fully vulcanized rubber is molded using rubber with a known moment of inertia.

5. The stress detection device for the rubber vulcanization process according to claim 1, characterized in that: The heating box is connected to an external electronic device (8) via a data cable (9) for control.

6. The stress detection device for the rubber vulcanization process according to claim 5, characterized in that: Next to the heating box is a camera (7) for recording the deformation process of the non-fixed part of the sample assembly; the electronic device is also connected to the camera via a data cable.

7. A method for detecting stress during the vulcanization process of rubber, using the stress detection device for the vulcanization process of rubber as described in claim 5, characterized in that: Includes the following steps; Step S1: Measure the moment of inertia of the fully vulcanized rubber (1), and denot it as I; Step S2: Measure the elastic modulus of the fully vulcanized rubber (1) and record it as E; Step S3: Measure the length of the fully vulcanized rubber (1) on the side adjacent to the transparent window, and record it as l; Step S4: Control the heating chamber to set the temperature required for stress testing of the unvulcanized rubber sample (2), and record the deformation of the free end of the bond between the fully vulcanized rubber (1) and the unvulcanized rubber sample (2) during heating. The free end is the non-fixed end. The length of the free end from the platform is recorded as d. t ; Step S5: Calculate the stress during the vulcanization process.

8. The method for stress detection during rubber vulcanization process according to claim 7, characterized in that: The method is used for stress detection during the vulcanization process of high mechanical performance rubber parts; in step S4, the temperature of the heating process is gradually changed so that the temperature of each part of the unvulcanized rubber sample is uniformly raised.

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