A real-time point-and-pull AS scheduling system

Abstract

The present application relates to production plan management technical field, specifically, it relates to a kind of real-time fixed-point pull AS scheduling system, including fixed-point pull module, timing rearrangement module and quantitative pull module, through mold plan end time anchor point setting in fixed-point pull module, whole-link process node inverse push, push calculation and node binding solidification, it can realize the unified calibration and accurate linkage of each process time node, improve production plan execution precision, through 15 minute time window rotation in timing rearrangement module Collection process parameters, mold temperature rise latest completion time threshold setting, actual temperature rise rate and temperature delay length calculation and whole-link node dynamic rearrangement, through production window period and material delivery time calculation in quantitative pull module, vulcanization demand rate and buffer total duration deduction, safety stock dynamic correction, net demand and accurate accounting of production batch quantity and inventory pre-deduction closed-loop control.

Description

Technical Field

[0001] This invention relates to the field of production planning and management technology, and more specifically, to a real-time fixed-point pull AS scheduling system. Background Technology

[0002] With the development of production information management, systems such as APS, AP, and AS have been widely adopted, resulting in a wide variety of technical approaches and a flourishing market. Many manufacturing enterprises customize their systems according to their own process characteristics, leading to diverse and varied customer needs and concepts, resulting in low universality.

[0003] Currently, traditional AS scheduling systems mostly adopt a static calculation mode for the start of the shift. Once the plan is issued, it is difficult to adjust it dynamically. If there are abnormal equipment stoppages, semi-finished product quality defects, or temporary order changes on the production site, manual intervention is required to recalculate the schedule. This not only results in slow response and low efficiency, but also easily leads to unnecessary losses such as vulcanizing machines waiting for materials and wasted capacity due to untimely adjustments. Furthermore, in the tire production scenario, tires need to go through multiple core processes such as mixing, molding, and vulcanization during the production process. Each link is closely linked and has a very high degree of time coupling. If the production line experiences time errors due to delays in upstream processes or deviations in equipment cycle time, it will directly lead to the break in the connection between upstream and downstream processes, mismatch between material supply and demand, and ultimately cause vulcanizing machines to run idle waiting for materials or tire blanks to accumulate in advance, resulting in production disorder. Meanwhile, during the vulcanization process, the tire blank is also prone to delays in vulcanization start time due to process fluctuations such as delayed mold heating and tooling mismatch. At this time, the time disturbance of the vulcanization process will be transmitted upstream along the industrial chain, directly disrupting the production rhythm of upstream processes such as molding and semi-finished parts. This may lead to performance degradation of the tire blank while waiting for vulcanization, reduce tire processing quality, and also cause a chain reaction of problems such as inventory backlog of semi-finished products and insufficient utilization of production resources, ultimately affecting overall production efficiency and product quality. In view of this, we propose a real-time fixed-point pull AS scheduling system. Summary of the Invention

[0004] The purpose of this invention is to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides a real-time fixed-point pull AS scheduling system, including a fixed-point pull module, a timed rescheduling module, and a quantitative pull module; The fixed-point pull module is used to calculate the mold plan end time, and uses the mold plan end time as the time anchor point to calculate the time nodes of the preceding process and the subsequent process. The timed rescheduling module is used to collect mold temperature, set processing parameter thresholds, compare mold temperature with processing parameter thresholds, and determine whether it is necessary to recalculate the time nodes of the preceding and subsequent processes. If so, the mold plan end time is recalculated through the fixed-point pull module. The time nodes of the preceding and subsequent processes are calculated based on the recalculated mold plan end time to match the processing process status. Quantitative pull module: Define the mold plan end time, the time node of the preceding process, and the time node of the subsequent process as time data; Predict the production window and material delivery time for each process based on time data, set safety stock target values, and determine whether it is necessary to calculate and dynamically adjust the safety stock target values; if so, adjust the safety stock target values. Finally, the net demand and production batch size are calculated using the reverse decomposition method.

[0006] Preferably, the mold plan end time is defined as the time anchor point; in the fixed-point pull module, the mold plan end time is equal to the mold plan start time plus the mold plan cycle time; The specific calculation of the time nodes of the preceding process is as follows: based on the embryo process and time anchor points, calculate the end time of the embryo forming plan and the start time of the embryo forming plan; The calculation of subsequent process time nodes is as follows: Based on the vulcanization process and time anchor point, vulcanization time parameters are obtained. Vulcanization time parameters include the standard vulcanization processing cycle, the time from tire blank to vulcanization transfer, and the time from vulcanization to inspection transfer. The vulcanization plan start time and vulcanization plan end time are calculated.

[0007] Preferably, the specific rules for setting the threshold values ​​of processing parameters in the timed reordering module are as follows: Obtain the time nodes of the preceding and subsequent processes, and calculate the latest completion time of mold heating. The specific steps for recalculating the time nodes of the preceding and subsequent processes are as follows: obtain the actual temperature of the mold collected in rotation within time window A, calculate the actual heating rate, calculate the heating delay time based on the actual heating rate, and recalculate the time nodes of the preceding and subsequent processes based on the heating delay time.

[0008] Preferably, the latest completion time of mold heating is equal to the start time of the vulcanization plan minus the temperature difference of mold heating; The specific expression for the actual heating rate is as follows: ; in: The previous acquisition time indicates the moment when the mold temperature data was acquired within the previous time window; The temperature of the mold collected previously indicates that... The actual temperature value of the mold collected at all times; The actual acquisition time represents the moment when the mold temperature data was acquired within time window A. The actual mold temperature collected is represented as... The actual temperature value of the mold collected at all times; The heating delay time is equal to the temperature difference of the mold divided by the actual heating rate.

[0009] Preferably, the rules for setting the safety stock target value in the quantitative pull module are as follows: Obtain the planned quantity of vulcanization process, the production window period of each process, and the process loss rate of molding process. Calculate the vulcanization demand rate, which is equal to the planned quantity of vulcanization process divided by the production window period of each process. Then, the transfer time of this process, the vulcanization preparation time, and the minimum processing cycle of a single batch in the molding process are received, and the total buffer time is calculated. The total buffer time is equal to the transfer time of this process plus the vulcanization preparation time and the minimum processing cycle of a single batch in the molding process. The safety stock target value is equal to the vulcanization demand rate multiplied by the total buffer duration.

[0010] Preferably, the net demand and production batch size are calculated as follows: Obtain the required quantity for the molding process and the current inventory quantity. Combine this with the safety stock target value to calculate the net demand. The net demand equals the required quantity for the molding process minus the current inventory quantity plus the safety stock target value. The production batch size is equal to the maximum of the net demand and the minimum production batch size for the molding process.

[0011] Preferably, the comparative method for dynamically adjusting the safety stock target value is as follows: obtain the heating delay time, compare the heating delay time with 0, if the heating delay time is equal to 0, it means that the mold heating is completed as planned, the vulcanization plan start time is not delayed, the production rhythm is stable, and there is no need to extend the total buffer time. Conversely, if the heating delay time is greater than 0, it means that the mold heating was not completed as planned, the vulcanization plan start time is postponed, and the heating delay time needs to be added to extend the total buffer time, dynamically adjust the safety stock target value, and obtain the safety stock target adjustment value. The revised safety stock target is equal to the sum of the vulcanization demand rate multiplied by the total extended buffer duration plus the heating delay duration.

[0012] Preferably, the end time of the tire blank forming plan is equal to the end time of the mold plan minus the transfer time from the tire blank to vulcanization, and then minus the process deviation buffer time; The start time of the embryo formation plan is equal to the end time of the embryo formation plan minus the standard processing cycle of embryo formation. The start time of the vulcanization plan is equal to ; The end time of the vulcanization plan is equal to the start time of the vulcanization plan plus the standard vulcanization processing cycle.

[0013] Preferably, the expression for calculating the required quantity of forming processes in the quantitative pull module is as follows: ; in: The planned quantity for the vulcanization process is determined by the total order volume, vulcanization capacity, and production window. This refers to the process loss rate of the molding process; The quantity required for the molding process.

[0014] Preferably, the specific expression for predicting the production window period of each process using time data in the quantitative pull module is as follows: ; in: This indicates the earliest possible start time for this process; This indicates the planned completion time of the preceding process in this operation; This refers to the transfer time for this process, which is the standard time for transferring materials from the previous process's work area to this process's work area, including the entire process time for material handling, handover, and positioning. This is the latest time that this process must be completed; This refers to the planned start time of the subsequent processes in this operation; This is a buffer time reserved for material preparation and process review after the completion of this process. The specific expression for Material Requirements Delivery Time is as follows: ; in: Material demand delivery time indicates the point in time when the material needs to be delivered to the downstream process area; The planned start time for downstream processes; This represents the time spent on vulcanization preparation, which is the standard time spent on material preparation, verification, and tooling adaptation before the start of downstream processes.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This real-time fixed-point pull AS scheduling system, through the setting of mold plan end time anchor points, reverse calculation and forward calculation of all process nodes and node binding and solidification in the fixed-point pull module, can achieve unified calibration and precise linkage of time nodes of each process. This can effectively avoid the occurrence of vulcanizing machines waiting for molds and materials, early delivery of tire blanks and idleness, and disordered process connection, thereby improving the accuracy of production plan execution, the comprehensive utilization rate of core equipment, and the stability and efficiency of order delivery. Furthermore, by using the 15-minute time window in the timed rescheduling module to collect process parameters, set the latest completion time threshold for mold heating, calculate the actual heating rate and heating delay time, and dynamically reschedule all nodes in the entire chain, it is possible not only to achieve real-time synchronization of process status and time nodes, but also to effectively avoid quality defects such as under-vulcanization and over-vulcanization of tires caused by process anomalies such as mold temperature fluctuations. This achieves the effects of improving the flexibility of production planning, ensuring the stability of vulcanization process, and reducing production losses. Finally, through the calculation of production window and material delivery time, derivation of vulcanization demand rate and total buffer time, dynamic correction of safety stock, accurate calculation of net demand and production batch, and closed-loop control of inventory pre-deduction in the quantitative pull module, it can not only work in conjunction with the time node constraints in the fixed-point pull module and the process fluctuation deviation data in the timed rescheduling module, but also achieve the goal of accurately matching material demand and production rhythm. Ultimately, it can realize on-demand production, eliminate material shortages and waste due to excessive stockpiling, improve inventory turnover efficiency, production resource utilization, and the overall efficiency of vulcanization equipment. It can effectively carry out three-dimensional integrated control of time, status, and quantity across the entire chain, and completely solve the industry pain points of traditional static scheduling systems such as disconnect between planning and on-site operations, delayed response to anomalies, and rigid resource allocation.

[0016] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall module of a real-time fixed-point pull AS scheduling system according to the present invention. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Currently, the production of tires typically involves core processes such as rubber compound preparation, semi-finished component processing, tire blank forming, mold matching, tire vulcanization, and finished product inspection. Each process is interconnected and linked step by step to ultimately complete the overall tire production process. During the tire production process, when the AS scheduling system controls the production line, the traditional method is to use a one-time static calculation mode at the start of the shift. For example, based on the static basic data before the start of the shift, the planners use the AS scheduling system to calculate and issue the production plan for the entire process and each process of the shift at once. During the production process, the AS scheduling system does not automatically recalculate or adjust the plan, and the plan remains fixed throughout the entire process. While the one-time static calculation mode can quickly complete the formulation and issuance of shift production plans, achieve unified allocation of production tasks, and ensure the basic progress of the production process under normal production line conditions, meeting the basic scheduling requirements of standardized batch production, tire production involves many processes and long links. Each step, including rubber preparation, semi-finished component processing, tire blank forming, mold matching, and vulcanization, is interconnected. The production process is affected by various dynamic factors such as equipment operating status, material supply, and fluctuations in process parameters. Therefore, tire production may experience unexpected issues such as production delays, quality defects, production line failures, material shortages, and tooling mismatches. In such situations, the static calculation model for a single shift can easily lead to problems such as a disconnect between the plan and actual production, delayed response to anomalies, and rigid resource allocation. This results in the production plan being unable to adapt to the dynamic production site, causing problems such as work stoppages due to material shortages, overproduction and material backlog, idle and wasteful equipment, low production efficiency, and fluctuations in product quality during tire production. This not only affects the completion rate of tire production plans for a single shift but also causes ineffective waste of production resources, increases tire production inventory and labor costs, and reduces the overall utilization rate of core equipment such as vulcanizing machines and molding machines, ultimately affecting the overall production and delivery efficiency and production benefits of tires. Therefore, to avoid the above situation, such as Figure 1 As shown, this invention provides a real-time fixed-point pull AS scheduling system, including a fixed-point pull module 100, a timed rescheduling module 200, and a quantitative pull module 300, specifically: The fixed-point pull module 100 obtains the mold plan start time and mold plan cycle time, calculates the mold plan end time based on this, defines the mold plan end time as the time anchor point, and calculates the time nodes of the preceding process and the subsequent process using the time anchor point as the reference through the reverse calculation method and the forward calculation method. The time nodes of the preceding process and the subsequent process are bound and fixed, the fixed-point pull command is issued, and the initial state of the time nodes of the preceding process and the subsequent process is marked as the waiting-to-start state. Because the tire production process is interconnected and the connection between each link is highly demanding, and the vulcanization process is the core process, when a tire needs to be vulcanized, if the mold matching process is delayed, the tire blank will be transported to the vulcanizing machine in advance, resulting in the tire blank waiting time being too long and the vulcanizing machine waiting for the mold, which affects the continuity of the production cycle and the utilization rate of the vulcanizing machine. If the tire blank is left for too long, it will cause the plastic to soften, deform, and become contaminated. If the mold matching process is completed too early, the vulcanizing machine will run idle. At this time, the mold will be preheated at high temperature on the vulcanizing machine for a long time, which will accelerate the wear of the mold pattern and the peeling of the coating. This will not only reduce the service life of the mold, but also cause the tire surface pattern to be unclear, resulting in dimensional deviations, poor rubber layer bonding, and ineffective waste of rubber preheating energy, ultimately leading to a reduction in tire production quality. To avoid production waste caused by the disconnect between vulcanizing machine preparation and mold matching, and to prevent a decrease in the overall tire production quality, it is essential to obtain the planned start time of the mold. Since the planned start time serves as the starting point for the entire mold matching process, it provides a unified time benchmark for mold selection, installation, debugging, and verification. This results in precise planning of the entire mold matching process and anchoring the planned end time of the mold, thus accurately matching the timing of subsequent vulcanization processes. This ensures that the progress of the mold matching process is highly aligned with the start rhythm of the vulcanization process, guaranteeing that the mold is precisely in place when the vulcanizing machine is ready. This achieves synchronous connection between tire delivery and mold matching, preventing problems such as idle vulcanizing machines and waiting for materials in production processes from the outset. Furthermore, due to the differences in the compatibility of molds used in tire production and the standardized time requirements for machine operation, it is impossible to accurately control the entire process of mold assembly and determine the actual delivery time of the mold to the vulcanization process if only the planned start time of the mold is used. This will result in a misalignment between the mold assembly completion time and the vulcanization process start time. Therefore, it is necessary to accurately obtain the corresponding mold planning cycle time based on specific production process parameters such as tire specifications, tread type, and matching vulcanizing machine model. The mold planning cycle time can serve as a standardized time consumption benchmark for the entire mold matching process, accurately defining the total time required for mold selection, installation, debugging to verification, thereby improving the accuracy of mold planning end time calculation, providing a reliable basis for anchoring the time of the entire process, and enabling the progress rhythm of the mold matching process to have a clear time scale and form a precise matching effect with the time connection of the preceding and following processes. Furthermore, due to the strong coupling of processes throughout the tire production chain, time deviations in any link can affect upstream and downstream processes. Tire production is also highly susceptible to dynamic factors such as equipment operating status, material transfer rhythm, and on-site operational efficiency. If only the time nodes of individual processes are determined without establishing a unified time benchmark, the start and end times of each process will lack a unified calibration basis. This can easily lead to disordered process connections, loss of production rhythm, and even a chain reaction of material shortages, shutdowns, and idle equipment. Therefore, based on the mold planning start time and mold planning cycle time, the mold planning end time needs to be accurately calculated. The specific expression is as follows: ; in: The mold plan end time represents the planned time when the mold can be delivered to the vulcanization process after the entire process of mold selection, installation, debugging and verification is completed. It is the core time anchor point of the entire tire production chain. The mold start time represents the planned start point for the official commencement of the mold-related processes, and serves as the starting point for calculating the total time consumption of the entire mold process. The mold planning cycle time represents the standardized total time required to complete the entire mold assembly process, which is precisely determined by process parameters such as tire specifications, tread type, and vulcanizing machine model. Since the tire production process is carried out sequentially, from start to finish, it is a continuous process. Therefore, the planned end time for the mold is... It must be within the mold planning start time. Based on this, the mold planning cycle time This is the standard time required to complete the production of a tire of this specification, accurately representing the overall time span from the start to the end of tire production. Therefore, the start time is planned through the mold. mold planning cycle time Calculate the mold design end time This not only accurately anchors the completion node of the mold matching process, making the time matching between the mold matching process and the vulcanization process a clear benchmark, thus effectively avoiding production waste problems such as vulcanization machine waiting for molds and molds being idle in advance, ensuring the connection efficiency of core processes, but also lays the core foundation for subsequent derivation of the time nodes of all pre-processes and subsequent processes in the entire chain using this time as the sole benchmark through reverse and forward methods, providing a unified and accurate time calibration basis for the fixed-point pull of the entire tire production process.

[0020] Because the various processes in tire production are highly interconnected, time deviations can easily lead to a chain reaction throughout the entire production chain. The lack of a unified time benchmark can cause the connection between processes to be unclear, the production rhythm to be out of control, and production losses such as equipment idleness and waiting for materials in the process. Therefore, in order to achieve unified calibration and precise linkage of the time nodes of each process in the entire production chain, the mold planning end time is defined as the time anchor point of the entire production chain. At this time, the time anchor point can provide a unified calibration benchmark for the calculation of the time nodes of tire blank forming, vulcanization process and subsequent processes, thereby avoiding production waste such as vulcanizing machines waiting for molds and materials, tire blanks being idle, and finished products piling up. It can not only enable the time nodes of all processes such as rubber preparation, tire blank forming, vulcanization, etc. to be deduced in an orderly manner based on this anchor point, ensuring seamless connection and consistent rhythm of each link, but also significantly improve the execution accuracy of production plan, effectively reduce various production wastes caused by process disconnection, and optimize the comprehensive utilization effect of core equipment. Due to the mold project's end time Based on mold planning start time Mold planning start-up cycle time Precise calculations reveal that the pre-production processes of tire manufacturing, such as plastic preparation, semi-finished component processing, and tire blank forming, follow the core logic that the start time of subsequent processes determines the delivery time of pre-production processes. Therefore, using a time anchor point as a base, the time nodes for pre-production processes such as rubber preparation, semi-finished component processing, and tire blank forming are precisely calculated using a reverse calculation method. Taking the tire blank forming process as an example, the specific details are as follows: Using time anchor points as a reference, the embryo forming time parameters are obtained, including the process deviation buffer time. Standard processing cycle for embryo molding and the transfer time from embryo to vulcanization Calculate the end time of the embryo formation plan. ; Then, the end time of the embryo formation plan is used. Subtract the standard processing cycle for embryo formation The start time of the embryo formation plan was obtained. ; At this point, the end time of the embryo formation plan is calculated using the embryo formation time parameter. and the start time of the embryo formation plan It can not only accurately pinpoint the end time of the preform forming process, but also... Start time of embryo formation plan This allows for the reverse derivation of the time nodes for the tire blank forming process, ensuring a precise match between the production rhythm of the tire blank forming process and the start-up requirements of the downstream vulcanization process. This avoids production waste issues such as vulcanization machines waiting for materials and tire blanks being delivered early and left idle, thus improving the time coordination of the entire production chain and the comprehensive utilization rate of core equipment. Moreover, the derived time nodes for the tire blank forming process can provide a precise downstream benchmark for the reverse derivation of the time nodes for upstream processes such as semi-finished parts processing and rubber preparation. This ensures that the production rhythm of all upstream processes unfolds in an orderly manner with the vulcanization process as the core, achieving unified calibration and seamless connection of the time nodes of all processes in the entire production chain, and further guaranteeing the accurate execution and efficient implementation of the production plan.

[0021] Because the entire tire production chain requires not only precise support from upstream processes for downstream applications, but also the orderly connection of the core process (vulcanization) to subsequent stages, if only the time nodes of the upstream processes are derived without locking in the time for subsequent processes, it will lead to a lack of clear rhythm for finished product inspection, packaging, and warehousing after vulcanization starts. This can result in problems such as finished products piling up awaiting inspection and idle inspection processes, and may even disrupt the overall production schedule and affect order delivery efficiency. Therefore, we again use a time anchor point as the base point and lock in the time nodes of the vulcanization process through a forward calculation method, as follows: Based on the time anchor point, combined with the end time of the embryo formation plan. Obtain vulcanization time parameters, including the standard vulcanization processing cycle. Time from embryo to vulcanization and the time from vulcanization to testing and transportation ; Since the vulcanization process requires the simultaneous fulfillment of two core conditions—the completion of mold assembly and the delivery of the tire blank—for the vulcanization process to start smoothly and enter a stable production state, the production rhythms of the tire blank forming process and the core vulcanization process are precisely linked and synchronized without deviation. Therefore, the vulcanization plan start time... It needs to be in conjunction with the end time of the embryo formation plan. Mold design completion time Precise alignment effectively avoids production waste from the outset, such as vulcanizing machines waiting for molds and materials, and premature delivery of tire blanks leaving them idle. Therefore, the vulcanization plan start time... This enables precise time coordination between the tire blank forming process and the vulcanization process, thereby improving the time connection accuracy of the entire production chain and the comprehensive utilization rate of core equipment.

[0022] Furthermore, because the vulcanization process is the core bottleneck in the entire supply chain, only after vulcanization is completed does the tire possess the form and performance of a qualified finished product. Therefore, the completion time of the vulcanization schedule directly determines the start time of subsequent processes such as finished product inspection, packaging, and warehousing. Thus, the standard vulcanization processing cycle... and the start time of the vulcanization plan Calculate the end time of the vulcanization plan. The specific expression is as follows: ; in: The standard vulcanization cycle represents the total standard time required to complete the vulcanization process of a single batch of tires under given process parameters (such as temperature, pressure, and tire specifications).

[0023] By calculating the end time of the vulcanization plan and the start time of the vulcanization plan It can not only obtain the time node of the vulcanization process, thus facilitating the generation of accurate production schedules and ensuring that the production rhythm of each process in the entire chain is orderly and controllable, but also use the vulcanization process as the time benchmark for the core bottleneck process, enabling precise time linkage of each process in the entire tire production process and achieving seamless connection of each link. At the same time, it provides a unified time benchmark for the AS scheduling system to dynamically adjust the production plan in the future, fundamentally avoiding problems such as process disconnection, equipment idleness, and production waste, and ensuring the efficient implementation of the production plan. Furthermore, by constructing a time-riveting system with the vulcanization process as the core bottleneck, it is possible to calculate and execute the core production link points from tire blank forming to the vulcanization process. If production management only needs to cover the core manufacturing process, the vulcanization process nodes can be directly solidified and instructions can be issued based on the existing calculation results. It should be explained that if a closed-loop control of the entire process, including finished product testing and packaging, is to be achieved, the planned end time of the vulcanization process must be used as the benchmark. The time nodes of each subsequent process must be calculated and generated using the forward calculation method in order to obtain a complete production plan.

[0024] In summary, by calculating the mold design completion time... This is defined as a time anchor point. By using reverse and forward methods to calculate the time nodes of the entire process chain (e.g., tire blank forming, vulcanization), the time nodes of each process can be bound and solidified with the tire production batch. This not only ensures that the time nodes of each process correspond one-to-one with the production batch and cannot be arbitrarily altered, but also achieves precise synchronization between the tire blank forming and vulcanization processes. The rhythm of mold matching, material transfer and production execution is highly consistent, completely avoiding the production waste of waiting for molds and materials on vulcanizing machines and delivering tire blanks in advance and leaving them idle. This ensures that the execution of the entire production plan is highly consistent with the theoretical calculation. At the same time, it builds a tire production time management system with precise anchor points, coordinated links, and controllable execution, which can fundamentally guarantee the orderliness and stability of the production process, effectively improve the execution accuracy of the production plan, the comprehensive utilization rate of core equipment, and the stability and efficiency of order delivery.

[0025] The present invention takes into account that, since the vulcanization process is the core molding process in the tire production process, by heating and pressurizing the semi-finished tire in the mold, the rubber material undergoes a vulcanization cross-linking reaction, thereby completing the tire shape shaping and physical property construction, and finally forming a finished tire with strength, elasticity and wear resistance. In actual production, even if the curing time nodes of each process are not deviated and the processes are executed according to the values ​​calculated by the AS scheduling system, when heating and pressurizing the semi-finished tires in the vulcanization process, factors such as mold temperature fluctuations, abnormal heating rates, and unstable pressure may lead to problems such as insufficient rubber vulcanization, inadequate cross-linking reaction, and inconsistent shape setting. This results in a situation where the time nodes of the semi-finished tires match, but the actual process conditions do not. For example, the vulcanization process is scheduled to take 15 minutes, but in actual production, the mold is set to a temperature of 150°C. At this point, the 15 minutes have elapsed, and the semi-finished tire needs to be placed into the mold for pressurization and heating. However, the temperature in the mold has only reached 140°C. If the semi-finished tire is vulcanized at this time, the temperature will be too low, resulting in under-vulcanization of the semi-finished tire in the mold. This leads to low vulcanization quality and affects the overall tire production effect. Therefore, to avoid the above situation, the timed rescheduling module 200 sets a time window A based on the time nodes of each process, dividing the time window A into 15-minute intervals. It then collects tire processing parameters within time window A in a rotating manner. These processing parameters include the actual mold temperature, vulcanizing machine pressure, and the real-time status of the tire blank. A threshold for the processing parameters is set, and the processing parameters are compared with the threshold. Taking the actual mold temperature as an example, the specific details are as follows: The process parameter thresholds are set as follows: Obtain the time nodes for each process step, and calculate the latest completion time of mold heating based on the time nodes for each process step. Specifically: Because the mold heating rate is affected by factors such as equipment operating conditions, ambient temperature, and rubber compound formulation, it is uncertain. If the heating is too slow, the timing of vulcanization initiation will not match the process requirements. It may also result in forced vulcanization initiation before the mold temperature reaches the target value, causing quality defects such as under-vulcanization, poor rubber layer bonding, and dimensional deviations. Therefore, in the mold assembly process, the latest completion time of mold heating accurately represents the final time when the mold temperature reaches the preset target value of the vulcanization process. Thus, calculating the latest completion time of mold heating is crucial. This technology can precisely control the mold heating progress, ensure that the mold is in the correct state when vulcanization starts, improve the synchronization of the process state and time nodes during the tire vulcanization process, and ensure the latest completion time of mold heating. The specific expression is as follows: ; in: The latest time to complete heating the mold to the preset temperature (process parameter threshold). The mold temperature difference represents the difference between the preset target temperature and the current actual temperature of the mold. This indicates that the mold needs to be heated to an even higher temperature. This refers to the start time of the vulcanization plan; Based on the time nodes of each process, the start time of the vulcanization plan Using the end-to-end time base as the core constraint, reverse engineering is performed. This not only ensures that the mold reaches the process temperature before the vulcanization process, but also avoids production waste caused by mold idling or preform waiting. It effectively achieves the requirement of synchronizing time nodes with process status. Therefore, by calculating the latest completion time of mold heating... This allows for precise binding of all time nodes across the entire production chain with the process requirements of mold and equipment status, thereby improving the executability of production plans and the controllability of process status, while also ensuring the latest completion time of mold heating. As a criterion for judging the process status, setting it as a threshold for processing parameters can not only accurately quantify the process constraints of each process and improve the real-time and accuracy of production status perception, but also verify whether the process status meets the fixed-point pull requirements within each time window A, so that the time node and the process status are always synchronized, and completely avoid the production problem of matching time nodes but mismatching process status. Furthermore, since mold temperature is a core processing parameter affecting the rate of rubber vulcanization and the degree of crosslinking, the deviation between its actual value and the threshold of the processing parameter directly determines the quality of vulcanization. Therefore, taking mold temperature as an example, comparing mold temperature with the threshold of the processing parameter can not only accurately identify the degree of matching between the mold heating progress and the process requirements, providing a clear quantitative basis for judging the production status, but also improve the timeliness of process anomaly warnings and the effectiveness of dynamic adjustment of production plans. Specifically: Compare mold temperature with the threshold values ​​of machining process parameters: If the mold temperature is not equal to the processing parameter threshold (mold temperature ≤ processing parameter threshold, mold temperature > processing parameter threshold), it indicates that the mold temperature has not reached the specified target state. This may lead to insufficient rubber crosslinking reaction, inadequate vulcanization, and inconsistent shape shaping, resulting in problems such as under-vulcanization, over-vulcanization, poor rubber layer bonding, and dimensional deviations in subsequent tire vulcanization processes. Consequently, the finished tire quality will be substandard, production losses will increase, and the utilization rate of core equipment will decrease, affecting order delivery stability and production efficiency. Therefore, the vulcanization plan start time needs to be recalculated. Triggering time node rescheduling and updating the time nodes of each process can effectively avoid the occurrence of mismatch between time nodes and process status, vulcanization quality defects, and disorder of the entire production rhythm, thereby improving tire production quality, comprehensive utilization rate of core equipment, accuracy of production plan execution, and stability and efficiency of order delivery. Recalculate the start time of the vulcanization plan Specifically, this involves: acquiring the actual temperature of the mold through a rotating data acquisition system, recording the actual acquisition time, and calculating the actual heating rate. The specific expression is as follows: ; in: The previous acquisition time indicates the moment when the mold temperature data was acquired within the previous time window; The temperature of the mold collected previously indicates that... The actual temperature value of the mold collected at all times; The actual acquisition time represents the moment when the mold temperature data was acquired within time window A. The actual mold temperature collected is represented as... The actual temperature value of the mold collected at all times; Due to the actual heating rate This only indicates the real-time heating rate of the mold within the current time window, and cannot directly reflect the additional time required for the mold to reach the target temperature. This will cause a deviation between the original vulcanization start time and the actual mold readiness state, resulting in a mismatch between the vulcanization start timing and process requirements. The formula for calculating the heating delay time is as follows: ; in: The mold temperature difference represents the difference between the preset target temperature and the current actual temperature of the mold. This indicates that the mold needs to be heated to an even higher temperature. The heating delay time represents the additional time required for the mold to rise from the current temperature to the preset target temperature at the current actual heating rate, i.e., the length of time that vulcanization start needs to be delayed. By calculating the actual heating rate and the duration of temperature rise It can not only accurately quantify the deviation between the mold heating state and the plan, improving the real-time and accuracy of production status perception, but also avoid quality defects such as under-vulcanization and over-vulcanization caused by forcibly starting vulcanization due to mismatch in process status. It plays a role in dynamically correcting the production plan and ensuring the synchronization of process status and time nodes, thereby improving the quality and stability of tire vulcanization and achieving the effect of precise control of the entire production rhythm, reduced production loss, and improved order delivery efficiency.

[0026] In summary, taking mold temperature as an example, the latest completion time of mold heating is calculated based on the time nodes of each process. By setting processing parameter thresholds based on this, not only can the production cycle time and process status be matched in advance, improving the prediction and control accuracy of subsequent vulcanization processes, but it can also facilitate the comparison of real-time processing parameters and thresholds, accurately determining whether the process status meets the fixed-point pull conditions. Simultaneously, by calculating the heating delay time... It can dynamically rearrange the vulcanization start time and process nodes throughout the entire chain, avoiding quality defects such as under-vulcanization or over-vulcanization in subsequent tire vulcanization processes due to inconsistent timing and substandard conditions. It can also improve the flexibility of production planning and significantly enhance the synergy between time control and process control in tire vulcanization processes.

[0027] Furthermore, this invention also considers that, since the entire tire production chain is a multi-process continuous collaborative operation mode, the material requirements, output and production rhythm of each process are highly correlated, and the inventory of semi-finished parts, the number of tooling in use and the material consumption rate on site are all changing dynamically in real time. Although the core time nodes of the entire chain have been anchored by fixed-point pull and the process status and time nodes have been dynamically matched by the timed rescheduling module 200 to solve the core problems of when to produce and whether the nodes meet the standards, if only the production time and process status are controlled, without simultaneously combining the actual production to calculate the material requirements and reasonable output of each process, there will still be situations where the output of the previous process does not match the actual demand of the next process, there is a shortage or excessive backlog of core semi-finished parts and rubber materials, and tooling equipment runs idle or overloaded due to material mismatch. This will lead to problems such as blockage of the production logistics chain, a significant increase in inventory holding costs and a decrease in material turnover efficiency. Meanwhile, the binding, solidification and adjustment of process nodes in the fixed-point pull module 100, and the rescheduling of vulcanization start time caused by mold heating rate fluctuations and abnormal process parameters in the timed rescheduling module 200, will directly lead to dynamic changes in the production rhythm of each process in the entire chain. This will cause the demand time and quantity of rubber and semi-finished parts for each process to fluctuate synchronously. If only fixed-point pull and timed rescheduling are carried out, without quantitative pull, the production schedule of semi-finished parts and rubber will be seriously out of sync with the actual demand on site, some materials will be cut off from supply, causing production to stop and wait for materials, and some materials will be overproduced and stockpiled, resulting in expired and scrapped situations. This will lead to the disorder of the entire production chain rhythm, a significant decrease in the utilization rate of core equipment, an increase in the production material loss rate, and an extension of the order delivery cycle. Therefore, based on the core time nodes of fixed-point pull and the dynamic process status of timed rescheduling, the monthly production plan is decomposed step by step to the mold plan, vulcanization plan, molding plan, component plan, and rubber material demand plan. Combined with constraints such as inventory consumption cycle, tooling loading capacity, tooling usage quantity, and total order volume, the actual material demand and reasonable production plan of each process are calculated in real time to determine the optimal production sequence. This achieves precise matching between material demand and production rhythm, while simultaneously following preset rules to complete plan reductions and production sequence adjustments, avoiding disruption to the established logistics plan and current material feeding rules, ultimately constructing a time-based... state The three-dimensional integrated production control system completely avoids various production waste problems caused by time mismatch and status compliance but quantity mismatch during the production process, as detailed below: The quantitative pull module 300 receives time data and calculates the production window period and material delivery time for each process. The time data includes the planned end time of the mold. Mold planning start time Time nodes for each process; Obtain the planned processing quantity for the vulcanization process, and calculate the requirements for the next process using the reverse decomposition method; Obtain inventory quantity and loss rate, calculate net demand and production batch size.

[0028] Because the entire tire production process is highly collaborative, with stringent time requirements for each stage, and because the process status and equipment operation on the production site are constantly changing, static time nodes alone cannot accurately match material demand with production rhythm. This can easily lead to problems such as material delivery being too early and accumulating, or too late and waiting for materials. Therefore, based on time data, the earliest possible start time for each process is calculated. With the latest deadline Anchoring the production window period of each process , The specific expression is as follows: ; in: This indicates the earliest possible start time for this process; This indicates the planned completion time of the preceding process in this operation; This refers to the transfer time for this process, which is the standard time for transferring materials from the previous process's work area to this process's work area, including the entire process time for material handling, handover, and positioning. This is the latest time that this process must be completed; This refers to the planned start time of the subsequent processes in this operation; This is a buffer time reserved for material preparation and process review after the completion of this process. Because the entire tire production process is highly collaborative and the timing requirements for each stage are stringent, and the process status and equipment operation on the production site are constantly changing, static time nodes alone cannot accurately match material demand and production rhythm. This can easily lead to problems such as material delivery being too early and backlogging or too late and waiting for materials. Therefore, by calculating the production window period of each process, it is possible not only to achieve precise binding between the entire production rhythm and material demand, but also to eliminate material waiting backlog and avoid process downtime due to material shortages. This effectively improves the continuity of production rhythm and material turnover efficiency, and provides a unified and accurate time benchmark for subsequent quantitative demand decomposition, net demand calculation, and determination of optimal production batch size.

[0029] Meanwhile, the material requirements of each process must be precisely aligned with the start-up nodes of downstream processes. If only the production window is specified without constraining the material delivery time, problems such as material arrival leading to backlog or material delays causing downstream processes to stop due to material shortages may still occur. Therefore, it is also necessary to calculate the material delivery time based on time data. The specific expression is as follows: ; in: Material demand delivery time indicates the point in time when the material needs to be delivered to the downstream process area; The planned start time for downstream processes; This represents the time spent on vulcanization preparation, which is the standard time spent on material preparation, verification, and tooling adaptation before the start of downstream processes. By calculating the production window period and material delivery time of each process using time data, it is possible to not only achieve precise binding between the production rhythm and material demand of the entire chain, but also to eliminate material waiting backlog and avoid process stoppage due to material shortages, thereby improving the continuity of production rhythm and material turnover efficiency. It can effectively provide a unified and accurate time benchmark for subsequent quantitative demand decomposition, net demand calculation and optimal production batch determination. Since only the time-anchoring module determines the production window and material delivery time for each process, it can only constrain when to produce and when to deliver, but cannot fully represent the actual amount of material that should be produced for each process. This can easily lead to problems such as mismatch between output and demand, material waste, or downtime due to material shortages. Therefore, to obtain the planned processing quantity for the vulcanization process, the demand for the next process is calculated using a reverse decomposition method. Specifically, this involves obtaining the process loss of the molding process and combining it with the planned processing quantity for the vulcanization process. Calculate the required quantity for the molding process. The specific expression is as follows: ; in: The planned quantity for the vulcanization process is determined by the total order volume, vulcanization capacity, and production window. This refers to the process loss rate of the molding process; The quantity required for the molding process; In actual production, the molding process inevitably involves process losses such as defective embryos and scrap. If the planned vulcanization quantity is directly used as the molding output, the molding output, after deducting losses, will not be able to meet the vulcanization requirements. Therefore, the planned quantity processed through the vulcanization process should be used instead. and the process loss rate of the molding process. Able to calculate the required quantity for molding processes At this time, the number of molding processes required It can effectively represent the actual number of tire blanks to be produced to meet vulcanization requirements and cover molding losses, thereby improving the matching accuracy between material demand and production rhythm, and laying a foundation for subsequent net demand calculation and optimal production batch determination.

[0030] Furthermore, since the quantity required for the molding process is only the theoretical demand value and does not deduct the current existing inventory, the quantity required for the molding process is... It can only represent the theoretical demand for tire blanks to meet the needs of the downstream vulcanization process, and cannot determine whether actual production scheduling is required. It cannot achieve the effect of accurately matching the actual material shortage, which makes it impossible to accurately match the subsequent real-time deduction logic of inventory. It will also lead to tire blank inventory backlog and occupation of production resources due to excessive production scheduling. Therefore, to avoid the above situation, the net demand can be calculated by using parameters such as the required quantity of the molding process, the current inventory quantity, the safety stock threshold, and the process loss rate. This allows for the calculation of the final production batch size, and real-time inventory updates after production. The fixed-point pull module 100 can prevent the vulcanization demand from being met in a timely manner, increasing the risk of material shortages. Therefore, the time consumed by the transfer in this process is considered. Vulcanization preparation time Minimum processing cycle for a single batch in the molding process Calculate the total buffer duration The specific expression is as follows: ; in: The minimum processing cycle for a single batch in the molding process, that is, the shortest time from the start of production to the production of a qualified embryo blank; Since the replenishment cycle of the molding process and the time difference between material transfer and vulcanization preparation are the core uncertainties leading to material shortages and disrupted production rhythms, the total buffer time needs to be calculated. This method can effectively derive a time buffer benchmark that covers the entire production delay process, thereby providing an accurate time dimension basis for calculating the safety stock target value. This will improve the matching accuracy between the inventory buffer and actual production fluctuations, avoid waiting for materials in the vulcanization process due to insufficient inventory or tire blanks being stockpiled due to excessive inventory, and lay a reliable foundation for the subsequent quantitative calculation of the safety stock target value.

[0031] Furthermore, due to uncertainties such as replenishment cycles and material flow delays throughout the tire production chain, vulcanization processes may experience downtime due to material shortages or inventory buildup of tire blanks. Therefore, the vulcanization demand rate is crucial in these situations. and total buffer duration It can effectively calculate the target value of safety stock. This allows for a precise match between inventory buffers and production fluctuations, thereby improving production continuity and inventory turnover efficiency. Furthermore, process anomalies such as delayed mold heating can postpone vulcanization start-up times, easily leading to situations where conventional safety stock cannot cover extended demand and result in material shortages. Therefore, it is necessary to dynamically adjust the safety stock target value in such cases. This will prevent the above situation from occurring, specifically: Obtain the heating delay duration from the timed rescheduling module 200. If the heating time is delayed A value of 0 indicates that the mold heating was completed as planned, the vulcanization start time was not delayed, the production rhythm was stable, and there was no need to extend the total buffer time. ; Conversely, if the heating time is delayed If the value is greater than 0, it indicates that the mold heating was not completed as planned, and the vulcanization start time will be postponed, with the heating delay time being added to the total time. Extend the total buffer time Dynamically adjust the safety stock target value The safety stock target adjustment value is obtained. The specific calculation expression is as follows: ; Because delayed mold heating will postpone the vulcanization start-up time, the standard safety stock cannot cover the extended demand cycle. In this case, a target safety stock value needs to be calculated. This can effectively prevent the vulcanization process from stopping due to material shortages, and then the safety stock target value is taken. The calculation result is a fixed value, which is used to obtain a precise safety stock target quantity. As a fixed parameter, the net demand is calculated, which can effectively link the actual production demand of the molding process, the current inventory status and the safety stock benchmark. This enables material replenishment and production scheduling, and dynamic inventory deduction to be carried out effectively, thereby improving production continuity and inventory turnover efficiency. Ultimately, the goal of quantitative pull is achieved, resulting in a stable production rhythm and precise matching of material supply and demand throughout the tire industry chain.

[0032] Since current inventory neither fully covers the theoretical demand of the vulcanization process nor reaches the preset safety stock level, and the molding process is constrained by factors such as tooling load and equipment operating efficiency, making arbitrary small-batch production impossible, the net demand needs to be determined. And combined with production constraints (minimum production batch size for molding process) ), calculate production batch The specific calculation expression is as follows: ; in: The minimum production batch size for a single batch in the molding process is determined by both the tooling load and production efficiency. like If the value is ≤0, it means that the current inventory has met the demand and is higher than the safety stock level. There is no need to issue a production scheduling instruction to avoid overproduction and the backlog of embryos. Finally, the production batch will be scheduled. The data is sent to the AS scheduling system. During the production window of each process, inventory pre-deduction is executed simultaneously. This is synchronized with the fixed-point pull module 100 and the timed rescheduling module 200 to update inventory status and process progress in real time, thereby realizing demand transmission. Inventory calibration Production schedule issued The closed-loop management of the entire process, with synchronized status, ensures continuous production in the vulcanization process while minimizing the risk of inventory backlog of semi-finished products.

[0033] In summary, by using fixed-point pull scheduling of mold node anchor points, timed rearrangement of 15-minute dynamic process adjustments, and quantitative pull for precise safety stock and net demand calculations, it is possible to effectively... Improving the scheduling accuracy and responsiveness of the AS system enables coordinated production rhythm across the entire tire supply chain. This not only avoids downtime during the vulcanization process due to material shortages and disruptions in process nodes, effectively reducing inventory backlog of semi-finished products and material waste, but also fully... Real-time linkage between production data and inventory status can effectively improve the overall efficiency of vulcanizing equipment and the utilization rate of production resources.

[0034] 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 preferred examples and are not intended to limit 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 present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A real-time fixed-point pull AS scheduling system, characterized in that: It includes a fixed-point pull module, a timed rearrangement module, and a quantitative pull module; The fixed-point pull module is used to calculate the mold plan end time, and uses the mold plan end time as the time anchor point to calculate the time nodes of the preceding process and the subsequent process. The timed rescheduling module is used to collect mold temperature, set processing parameter thresholds, compare mold temperature with processing parameter thresholds, and determine whether it is necessary to recalculate the time nodes of the preceding and subsequent processes. If necessary, the mold plan end time can be recalculated via the fixed-point pull module; The time nodes of the preceding and subsequent processes are calculated based on the recalculated mold plan end time to match the processing process status. Quantitative pull module: Define the mold plan end time, the time node of the preceding process, and the time node of the subsequent process as time data; Predict the production window and material delivery time for each process based on time data, set safety stock target values, and determine whether it is necessary to calculate and dynamically adjust the safety stock target values; if so, adjust the safety stock target values. Finally, the net demand and production batch size are calculated using the reverse decomposition method.

2. A real-time fixed-point pull AS scheduling system according to claim 1, characterized in that: Define the mold plan end time as the time anchor point; in the fixed-point pull module, the mold plan end time is equal to the mold plan start time plus the mold plan cycle time; The specific calculation of the time nodes of the preceding process is as follows: based on the embryo process and time anchor points, calculate the end time of the embryo forming plan and the start time of the embryo forming plan; The calculation of subsequent process time nodes is as follows: Based on the vulcanization process and time anchor point, vulcanization time parameters are obtained. Vulcanization time parameters include the standard vulcanization processing cycle, the time from tire blank to vulcanization transfer, and the time from vulcanization to inspection transfer. The vulcanization plan start time and vulcanization plan end time are calculated.

3. A real-time fixed-point pull AS scheduling system according to claim 1, characterized in that: The specific rules for setting the threshold values ​​of processing parameters in the timed reordering module are as follows: Obtain the time nodes of the preceding and subsequent processes, and calculate the latest completion time of mold heating. The specific steps for recalculating the time nodes of the preceding and subsequent processes are as follows: obtain the actual temperature of the mold collected in rotation within time window A, calculate the actual heating rate, calculate the heating delay time based on the actual heating rate, and recalculate the time nodes of the preceding and subsequent processes based on the heating delay time.

4. A real-time fixed-point pull AS scheduling system according to claim 3, characterized in that: The latest completion time of mold heating is equal to the start time of the vulcanization plan minus the temperature difference of mold heating; The specific expression for the actual heating rate is as follows: ； in: The previous acquisition time indicates the moment when the mold temperature data was acquired within the previous time window; The temperature of the mold collected previously indicates that... The actual temperature value of the mold collected at all times; The actual acquisition time represents the moment when the mold temperature data was acquired within time window A. The actual mold temperature collected is represented as... The actual temperature value of the mold collected at all times; The heating delay time is equal to the temperature difference of the mold divided by the actual heating rate.

5. A real-time fixed-point pull AS scheduling system according to claim 1, characterized in that: The rules for setting the safety stock target value in the quantitative pull module are as follows: Obtain the planned quantity of vulcanization process, the production window period of each process, and the process loss rate of molding process. Calculate the vulcanization demand rate, which is equal to the planned quantity of vulcanization process divided by the production window period of each process. Then, the transfer time of this process, the vulcanization preparation time, and the minimum processing cycle of a single batch in the molding process are received, and the total buffer time is calculated. The total buffer time is equal to the transfer time of this process plus the vulcanization preparation time and the minimum processing cycle of a single batch in the molding process. The safety stock target value is equal to the vulcanization demand rate multiplied by the total buffer duration.

6. A real-time fixed-point pull AS scheduling system according to claim 5, characterized in that: The net demand and production batch size are calculated as follows: Obtain the required quantity for the molding process and the current inventory quantity. Combine this with the safety stock target value to calculate the net demand. The net demand equals the required quantity for the molding process minus the current inventory quantity plus the safety stock target value. The production batch size is equal to the maximum of the net demand and the minimum production batch size for the molding process.

7. A real-time fixed-point pull AS scheduling system according to claim 6, characterized in that: The specific method for dynamically adjusting the safety stock target value using the comparison method is as follows: obtain the heating delay time, compare the heating delay time with 0, if the heating delay time is equal to 0, it means that the mold heating is completed as planned, the vulcanization plan start time is not delayed, the production rhythm is stable, and there is no need to extend the total buffer time. Conversely, if the heating delay time is greater than 0, it means that the mold heating was not completed as planned, the vulcanization plan start time is postponed, and the heating delay time needs to be added to extend the total buffer time, dynamically adjust the safety stock target value, and obtain the safety stock target adjustment value. The revised safety stock target is equal to the sum of the vulcanization demand rate multiplied by the total extended buffer duration plus the heating delay duration.

8. A real-time fixed-point pull AS scheduling system according to claim 2, characterized in that: The end time of the tire blank forming plan is equal to the end time of the mold plan minus the transfer time from the tire blank to vulcanization, and then minus the process deviation buffer time; The start time of the embryo formation plan is equal to the end time of the embryo formation plan minus the standard processing cycle of embryo formation. The start time of the vulcanization plan is equal to ; The end time of the vulcanization plan is equal to the start time of the vulcanization plan plus the standard vulcanization processing cycle.

9. A real-time fixed-point pull AS scheduling system according to claim 6, characterized in that: The formula for calculating the required quantity of forming processes in the quantitative pull module is as follows: ； in: The planned quantity for the vulcanization process is determined by the total order volume, vulcanization capacity, and production window. This refers to the process loss rate of the molding process; The quantity required for the molding process.

10. A real-time fixed-point pull AS scheduling system according to claim 1, characterized in that: The specific expression for predicting the production window period of each process using time data in the quantitative pull module is as follows: ； in: This indicates the earliest possible start time for this process; This indicates the planned completion time of the preceding process in this operation; This refers to the transfer time for this process, which is the standard time for transferring materials from the previous process's work area to this process's work area, including the entire process time for material handling, handover, and positioning. This is the latest time that this process must be completed; This refers to the planned start time of the subsequent processes in this operation; This is a buffer time reserved for material preparation and process review after the completion of this process. The specific expression for Material Requirements Delivery Time is as follows: ； in: Material demand delivery time indicates the point in time when the material needs to be delivered to the downstream process area; The planned start time for downstream processes; This represents the time spent on vulcanization preparation, which is the standard time spent on material preparation, verification, and tooling adaptation before the start of downstream processes.

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