A control system and method for vulcanization of aviation rubber

Abstract

This invention relates to an aviation rubber vulcanization control system and its control method. The control system comprises four modules: a core data storage module, which stores vulcanization process parameters, working data, system programs, and user programs for different types of aviation rubber materials into the vulcanization equipment; an editor module, used to modify data and send it to the core data storage module, and also to check the program and detect the operating status of the control system; an input / output unit, which inputs vulcanization process parameters and monitors and displays the vulcanization process in real time; and a central processing unit, which reads sensor commands from the vulcanization equipment and executes pre-defined algorithm commands. This method constrains the mold heating time control rules, achieving effective management of the mold heating time and avoiding product quality problems caused by excessively long mold heating times.

Description

Technical Field

[0001] This invention relates to the field of aviation rubber product manufacturing and processing, specifically to an aviation rubber vulcanization control system and its control method. Background Technology

[0002] Currently, the main processing method for aerospace rubber parts is compression molding vulcanization. This process requires controlling and recording the vulcanization temperature, pressure, and time, which is time-consuming and labor-intensive. Furthermore, there are only two methods for controlling the vulcanization temperature rise of aerospace rubber materials: First, after the rubber blank is placed in the mold cavity, the vulcanization time is recorded immediately upon mold closing. The drawback of this method is that it cannot guarantee whether the mold reaches the vulcanization temperature specified in the process document, nor can it guarantee the degree of cross-linking of the rubber, affecting the physical properties of the product. Second, the timing begins when the mold temperature reaches the lower limit of the vulcanization temperature. The drawback of this method is that operators need to monitor the mold temperature throughout the heating process, and excessively long heating times can lead to pre-vulcanization of the rubber. After the vulcanization time is completed, the rubber may have varying degrees of over-vulcanization, affecting the physical properties of the product. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention proposes a vulcanization control system and method for aviation rubber. The technical problem to be solved by this invention is achieved through the following technical solution:

[0004] An aviation rubber vulcanization control system, the control system comprising four modules:

[0005] The core data storage module stores the vulcanization process parameters, working data, system programs, and user programs of different types of aviation rubber materials into the vulcanization equipment.

[0006] The editor module is used to modify data and send it into the core data storage module. It can also check the working status of the program detection and control system.

[0007] Input / output unit: Input vulcanization process parameters and monitor and display the vulcanization process in real time;

[0008] The central processing unit reads the sensor commands from the vulcanizing equipment and executes the set algorithm commands.

[0009] A method for controlling the vulcanization of aviation rubber, the method comprising the following steps:

[0010] Step 1: Define the specified vulcanization time T of the rubber compound, the mold heating time interval T1, the mold heating time conversion T2, the remaining vulcanization time interval T3 after the mold reaches the temperature, the mold heating start time t0, the mold temperature reaching time t1, and the mold heating process influencing factor A.

[0011] Step 2: Turn on the vulcanization equipment, set the lower limit of vulcanization temperature W1, the upper limit of vulcanization temperature W2, the lower limit of vulcanization pressure P1, and the upper limit of vulcanization pressure P2. When the vulcanization pressure reaches the lower limit P1, the system immediately and automatically records the mold heating start time t0. When the temperature sensor in the vulcanization equipment detects that the mold has reached the specified vulcanization temperature of the rubber material, it records the mold heating time t1. Then, it transmits an electrical signal to the central processing unit to calculate the mold heating time interval T1.

[0012] Step 3: After calculating the mold heating time interval T1, compare T1 with the specified vulcanization time T of the rubber compound stored in the core data storage module to calculate the proportion of T1 in T. At the same time, after the mold temperature reaches the lower limit of vulcanization temperature W1, compare the real-time collected temperature and pressure parameters with the lower limit of vulcanization temperature W1, the upper limit of vulcanization temperature W2, the lower limit of vulcanization pressure P1, and the upper limit of vulcanization pressure P2 stored in the core data storage module to calculate the influence factor A.

[0013] Step 4: Calculate the vulcanization time based on the influencing factor A to determine whether the product is scrapped.

[0014] When the proportion of T1 in T is less than or equal to 15%, A is recorded as 0, the time interval T1 of mold heating is not included in the vulcanization time of rubber compound, and the mold continues to vulcanize rubber compound;

[0015] When T1 accounts for more than 15% and less than or equal to 50% of T, A = 1, and the central processing unit reduces the curing time of the rubber compound by half.

[0016] When any of the following occurs: T1 accounts for more than 50% of T, the vulcanization temperature is lower than W1 or higher than W2, or the vulcanization pressure is lower than P1 or higher than P2, record A = +∞, the vulcanization equipment will alarm, and the rubber compound will be scrapped.

[0017] The mold heating time T2 is calculated using T2 = 1 / 2(t1-t0) × A. The remaining vulcanization time interval T3 after the mold reaches the desired temperature is calculated using the formula T3 = T - T2, i.e., T3 = T - 1 / 2(t1-t0) × A.

[0018] The beneficial effects of this invention are: This method constrains the mold heating time control rules, realizes effective management of mold heating time, avoids product quality problems caused by excessive mold heating time, and realizes automatic judgment and calculation of vulcanization process, solving problems such as high frequency of manual calculation and large amount of calculation, and greatly improving product quality and production efficiency. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the system structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the method flow of the present invention. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described more clearly and completely below with reference to the accompanying drawings in the embodiments. Of course, the described embodiments are only a part of the present invention and not all of it. Based on this embodiment, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of the present invention.

[0023] like Figures 1 to 2 As shown, an aviation rubber vulcanization control system includes four modules:

[0024] The core data storage module stores the vulcanization process parameters, working data, system programs, and user programs of different types of aviation rubber materials into the vulcanization equipment; the vulcanization process parameters include vulcanization temperature, vulcanization pressure, vulcanization time, etc.

[0025] The editor module is used to modify data and send it into the core data storage module. It can also check the working status of the program detection and control system. The editor module can set the PLC programmer for the vulcanizing machine and can also be connected to a personal computer to program the PLC of the vulcanizing machine.

[0026] The input / output unit inputs vulcanization process parameters and monitors and displays the vulcanization process in real time. It inputs processing parameters such as vulcanization temperature, time, and pressure of a certain rubber material to be processed through a display screen or an external computer. At the same time, it monitors the vulcanization processing parameters of aviation rubber materials at all times through temperature, time, and pressure sensors inside the vulcanizing machine and displays the relevant data in real time through a display screen or an external computer.

[0027] The central processing unit (CPU) reads sensor commands from the vulcanizing equipment and executes pre-defined algorithm commands. The CPU mainly consists of control circuitry, an arithmetic logic unit (ALU), and registers. It is connected to the core data storage module and input / output unit via address, data, and control buses. It can also read commands from the temperature and time sensors in the vulcanizing machine's memory and execute the pre-defined algorithm commands.

[0028] A method for controlling the vulcanization of aviation rubber, the method comprising the following steps:

[0029] Step 1: Define the specified vulcanization time T of the rubber compound, the mold heating time interval T1, the mold heating time conversion T2, the remaining vulcanization time interval T3 after the mold reaches the temperature, the mold heating start time t0, the mold temperature reaching time t1, and the mold heating process influencing factor A.

[0030] Step 2: Turn on the vulcanization equipment, set the lower limit of vulcanization temperature W1, the upper limit of vulcanization temperature W2, the lower limit of vulcanization pressure P1, and the upper limit of vulcanization pressure P2. When the vulcanization pressure reaches the lower limit P1, the system immediately and automatically records the mold heating start time t0. When the temperature sensor in the vulcanization equipment detects that the mold has reached the specified vulcanization temperature of the rubber material, it records the mold heating time t1. Then, it transmits an electrical signal to the central processing unit to calculate the mold heating time interval T1.

[0031] Step 3: After calculating the mold heating time interval T1, compare T1 with the specified vulcanization time T of the rubber compound stored in the core data storage module to calculate the proportion of T1 in T. At the same time, after the mold temperature reaches the lower limit of vulcanization temperature W1, compare the real-time collected temperature and pressure parameters with the lower limit of vulcanization temperature W1, the upper limit of vulcanization temperature W2, the lower limit of vulcanization pressure P1, and the upper limit of vulcanization pressure P2 stored in the core data storage module to calculate the influence factor A.

[0032] Step 4: Calculate the vulcanization time based on the influencing factor A to determine whether the product is scrapped.

[0033] When T1 accounts for less than or equal to 15% of T, A = 0 is recorded. The mold heating time interval T1 is not included in the vulcanization time of the rubber compound, and the mold continues to vulcanize the rubber compound. At this time, the mold heating time T2 = 0, the mold heating time interval is automatically filtered and is not included in the overall vulcanization time of the aviation rubber material. At this time, the remaining vulcanization time of the rubber compound T3 = T - 1 / 2(t1 - t0) × A. Since A = 0, T3 = T. When T1 accounts for less than or equal to 15% of T, the rubber compound macromolecular chain ends only undergo a very low degree of cross-linking reaction during the heating process. The rubber compound is still in a highly elastic state. The heating time T1 has a very small impact on the specified vulcanization time T of the rubber compound. Therefore, A = 0 is recorded.

[0034] When T1 accounts for more than 15% and less than or equal to 50% of T, A = 1, and the central processing unit reduces the vulcanization time of the rubber compound by half; at this time, T2 = 1 / 2(t1-t0) × 1, and the vulcanizing machine timer automatically reduces the heating time interval by half, i.e., T3 = T - 1 / 2(t1-t0) × A; when T1 accounts for more than 15% and less than or equal to 50% of T, the rubber compound macromolecular chain ends have undergone a certain degree of cross-linking reaction during the heating process, and the rubber compound is in a viscous flow state. The heating time T1 has a significant impact on the specified vulcanization time T of the rubber compound, so A = 1.

[0035] When any of the following occurs: T1 accounts for more than 50% of T, the vulcanization temperature is lower than W1 or higher than W2, or the vulcanization pressure is lower than P1 or higher than P2, A = +∞ is recorded, the vulcanization equipment alarms, and the rubber compound is scrapped. At this time, T2 = 1 / 2(t1-t0)×A, and A = +∞, that is, T2 < 0. The vulcanizing machine automatically alarms, indicating that the vulcanization of this mold is not completed, and the vulcanized rubber product is scrapped. When T1 accounts for more than 50% of T, the rubber compound macromolecular chain ends undergo a high degree of cross-linking reaction during the heating process. After passing through the high elastic state and viscous flow state, the rubber compound gradually transforms back into the high elastic state. The heating time T1 has a great influence on the specified vulcanization time T of the rubber compound, so A = +∞ is recorded.

[0036] When the vulcanization temperature is lower than W1, the vulcanization speed is slow, and the degree of vulcanization of the rubber decreases within the same time, resulting in lower physical properties. When the vulcanization temperature is higher than W2, the vulcanization reaction of the rubber intensifies. With the vulcanization time remaining unchanged, the aging resistance decreases. Therefore, we denote A = +∞.

[0037] When the vulcanization pressure is lower than P1, the rubber density decreases, affecting the rubber's hardness, strength, and other properties. When the vulcanization pressure is higher than P2, it can easily lead to mold damage. Therefore, we denote A = +∞.

[0038] The mold heating time T2 is calculated using T2 = 1 / 2(t1-t0) × A. The remaining vulcanization time interval T3 after the mold reaches the desired temperature is calculated using the formula T3 = T - T2, i.e., T3 = T - 1 / 2(t1-t0) × A.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely prisms of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for controlling the vulcanization of aviation rubber, characterized in that: The method includes the following steps: Step 1: Define the specified vulcanization time T of the rubber compound, the mold heating time interval T1, the mold heating time conversion T2, the remaining vulcanization time interval T3 after the mold reaches the temperature, the mold heating start time t0, the mold temperature reaching time t1, and the mold heating process influencing factor A. Step 2: Turn on the vulcanization equipment, set the lower limit of vulcanization temperature W1, the upper limit of vulcanization temperature W2, the lower limit of vulcanization pressure P1, and the upper limit of vulcanization pressure P2. When the vulcanization pressure reaches the lower limit P1, the system immediately and automatically records the mold heating start time t0. When the temperature sensor in the vulcanization equipment detects that the mold has reached the specified vulcanization temperature of the rubber material, it records the mold heating time t1. Then, it transmits an electrical signal to the central processing unit to calculate the mold heating time interval T1. Step 3: After calculating the mold heating time interval T1, compare T1 with the specified vulcanization time T of the rubber compound stored in the core data storage module to calculate the proportion of T1 in T. At the same time, after the mold temperature reaches the lower limit of vulcanization temperature W1, compare the real-time collected temperature and pressure parameters with the lower limit of vulcanization temperature W1, the upper limit of vulcanization temperature W2, the lower limit of vulcanization pressure P1, and the upper limit of vulcanization pressure P2 stored in the core data storage module to calculate the influence factor A. Step 4: Calculate the vulcanization time based on influencing factor A to determine whether the product is scrapped; When the proportion of T1 in T is less than or equal to 15%, A is recorded as 0, the time interval T1 of mold heating is not included in the vulcanization time of rubber compound, and the mold continues to vulcanize rubber compound; When T1 accounts for more than 15% and less than or equal to 50% of T, A = 1, and the central processing unit reduces the curing time of the rubber compound by half. When any of the following occurs: T1 accounts for more than 50% of T, vulcanization temperature is lower than W1 or exceeds W2, or vulcanization pressure is lower than P1 or exceeds P2, record A = +∞, the vulcanization equipment will alarm, and the rubber compound will be scrapped. The mold heating time T2 is calculated through T2 = 1 / 2(t1-t0)×A, the remaining vulcanization time interval T3 after the mold reaches the desired temperature is given by the formula T3=T-T2, i.e., T3=T- 1 / 2(t1-t0)×A.

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