Die changing method based on actual running time of car frame

Abstract

A die changing method based on the actual running time of a car frame comprises the steps that firstly, the running time of car frame dies of different material numbers is calculated and serves as the standard time of a die changing period; 2, the actual operation time of each trolley is grabbed through a PLC data acquisition system; 3, comparing the actual operation time of each trolley with the standard time according to the material number of the hung order by the trolley, and judging whether a mold changing period is reached or not; 4, the system obtains the information of arriving at the vehicle platform needing die change, carries out statistics and summarization on the information to form a report, and displays the report; 5, an operator performs manual die change according to the data of the report, logs in an equipment system through a handset after die change, and manually inputs a car number after die change into the system; and sixthly, the system automatically analyzes the difference value between the system prompt mold changing time and the manual actual mold changing time, and the actual mold changing completion time is monitored. According to the method, the utilization rate of the mold is effectively improved, and time waste caused by abnormal conditions such as planned shutdown and car frame maintenance is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel wire drawing, in particular to a die changing method according to actual running time of a machine. BACKGROUND

[0002] The production process of steel cord is: semi-finished product-wet drawing-cord and several steps. The wet drawing process is to draw the alloy raw material of coarse specification through multiple passes of the die to produce the required steel wire of different diameter specifications. In the technical field of steel wire drawing, in order to ensure the stability of the quality of the drawn steel wire, the die needs to be replaced regularly. Generally, the die replacement cycle can be determined according to the service time or output of the die. Since the number of wire drawing machines is generally large, the current periodic die changing generally adopts a fixed date format periodic die changing table, and the machine is periodically changed after the fixed natural days of die replacement.

[0003] The main problem of using the fixed format periodic die changing table is that when the machine structure is changed temporarily during the production of the structure, or the machine is stopped during the production, and the die changing worker still performs periodic die changing according to the corresponding date in the periodic die changing table, the actual service time of the die will be lower than the set period, which will cause waste of the die, and also increase the workload of the die changing worker. SUMMARY

[0004] In view of the above technical problems, the present technical solution provides a die changing method according to the actual running time of the machine, which replaces the natural time period for preventive die changing by grabbing the actual running time of the machine, changes the traditional preventive die changing method in the steel cord industry, and effectively improves the utilization rate of the die; and effectively solves the above problems.

[0005] The present application is realized by the following technical solutions:

[0006] A die changing method according to the actual running time of the machine, comprising the steps of:

[0007] Step 1: The EMS system provides specification information, calculates the running time of each machine with different material numbers according to the specification information, and takes the running time as the standard time of the preventive die changing period, and transmits the standard time to the equipment system;

[0008] Step 2: The PLC data acquisition system grabs the actual running time of each machine, and transmits the actual running time to the equipment system;

[0009] Step 3: The equipment system collects information according to the specifications of the machines, compares the actual running time of each machine with the standard time according to the material number of the order hung on each machine, and judges whether the die changing time is reached;

[0010] Step 4: The device system acquires information of the die-changing machine and carries out statistics, and meanwhile, the device system acquires key information of each specification in the MES system and automatically summarizes the information into a report form to make a die-changing report;

[0011] Step 5: The operator manually changes the die of the machine according to the data of the report, and after the die is changed, the operator logs in the device system through the handheld device, registers and manually inputs the machine number and time after the die is changed into the device system;

[0012] Step 6: The device system synchronizes the die-changing registration time to the "actual die-changing time" in the die-changing report; meanwhile, after the device system receives the manually input machine number and time after the die is changed, the device system re-calculates the running time of the corresponding machine number;

[0013] Step 7: The operation steps of steps 2 to 6 are repeated.

[0014] Further, the running time of the machine with different material numbers in step 1 is as follows:

[0015] When the order material number of the machine is 54xxxNxx, the preventive die-changing period is 240 hours;

[0016] When the order material number of the machine is 54xxxHxx, the preventive die-changing period is 192 hours;

[0017] When the order material number of the machine is 54xxxSxx, the preventive die-changing period is 96 hours;

[0018] When the order material number of the machine is 54xxxUxx, the preventive die-changing period is 72 hours.

[0019] Further, the comparison of the actual running time of each machine with the standard time in step 3 is based on the total number of dies in the die-changing machine report acquired by the device system. When the total number of dies is between 4 and 17, the machine number is replaced according to the die-changing period of 1+4(B) to 1+4(F) in sequence. When the "intermediate die number" acquired is greater than or equal to 18, the die is replaced from 1+4(B) again. The starting die-changing period is acquired from the "stop-die-changing report", and the subsequent die-changing period is sequentially continued according to the data of the "die-changing machine report". During the production process, the small period die is replaced due to abnormal reasons, and the starting time of the small period die is calculated again according to the abnormal small period die to improve the utilization rate of the die.

[0020] Further, the die change report in step 4 is a die change report for a die change vehicle platform, and the die change platform report template includes six kinds of reports: full set (A), 1+4 (B), 1+4 (C), 1+6 (D), 1+4 (E), and 1+4 (F); the die change number of the full set (A) is 26, the die change number of 1+4 (B), 1+4 (C), 1+4 (E), and 1+4 (F) is 8, and the die change number of 1+6 (D) is 10 (in general, the die change number is as described above, and the specific specifications will be adjusted slightly).

[0021] Further, the full set (A), 1+4 (B), 1+4 (C), 1+6 (D), 1+4 (E), and 1+4 (F) are defined as six-step cycle die change, and when the die change on the platform is A, the user should be informed to change the die according to the B mode when the next die change is due; if the die change is advanced, it is considered to have been changed according to the B mode, and the next cycle is started to be calculated, and the next time the die change is due, the user is prompted to change the die according to the C mode; the die change cycle between every two is 72 / 96 / 192 / 240 hours.

[0022] Further, the 72 / 96 / 192 / 240 hours correspond to the specification strength of UT (ultra super strength), ST (ultra high strength), HT (high strength), and NT (ordinary strength), respectively; taking UT as an example, the die change cycle between the full set (A) and 1+4 (B) is 72 hours, and the die change cycle between 1+4 (B) and 1+4 (C) is 72 hours. Taking ST as an example, the die change cycle between the full set (A) and 1+4 (B) is 96 hours, and the die change cycle between 1+4 (B) and 1+4 (C) is 96 hours.

[0023] Further, the die change report in step 4 can be displayed through a handheld machine or a display, and the die change report displays the die sequence that needs to be changed.

[0024] Further, after the operator manually enters the vehicle platform number and time after the die change into the device system through the handheld machine in step 5, the system automatically analyzes the difference between the system prompt die change time and the manual actual die change time, and monitors whether the actual die change time is advanced or delayed.

[0025] Further, the calculation logic of the difference between the system prompt die change time and the manual actual die change time is that the manual actual die change time is subtracted from the system prompt die change time, and the positive difference value indicates that the actual die change time is delayed, and the negative difference value indicates that the actual die change time is advanced.

[0026] Beneficial effects

[0027] The die change method according to the actual running time of the vehicle platform provided by the present application has the following beneficial effects compared with the prior art:

[0028] The present application changes the traditional preventive die changing mode in the steel cord industry by using the actual running time of the vehicle platform to replace the natural time period for preventive die changing, effectively improves the utilization rate of the die, avoids the waste of time caused by planned downtime, vehicle platform maintenance and other abnormal situations, and optimizes the die changing period from "days" to "hours". Taking 0.295 specifications as an example, the die utilization efficiency can be improved from 70% to 100% after using the die changing method according to the actual running time of the vehicle platform, the die consumption is reduced from 12.464 to 8.725 per ton, the die consumption is reduced by 30%, and the production cost is greatly saved. And using the actual running time of the vehicle platform as the preventive die changing period, the preventive die changing mode of different steel wire diameters is unified on the basis of the same material number form, so that the die changing mode becomes simple, for example: the die changing mode of 54225S00 and 54295S00 is consistent. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a whole flowchart of the present application.

[0030] Figure 2 It is a flowchart of six-step cycle die changing in the present application.

[0031] Figure 3 It is an example of report summary in the present application.

[0032] Figure 4 It is an experimental die chain analysis diagram of 90ST-0.295ST in the present application.

[0033] Figure 5 It is a single wire twist performance comparison diagram under different die changing modes in the present application.

[0034] Figure 6 It is a single wire breaking performance comparison diagram under different die changing modes in the present application.

[0035] Figure 7 It is a die consumption trend chart of the present application. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The described embodiments are only some of the embodiments of the present application, not all. Without departing from the design concept of the present application, various modifications and improvements of the technical solutions of the present application made by those skilled in the art shall fall within the protection scope of the present application.

[0037] Embodiment 1:

[0038] A die changing method according to the actual running time of the vehicle platform, comprising the steps of:

[0039] Step 1: The EMS system provides each specification information, and calculates the running time of different material number car platform according to each specification information, as the standard time of the preventive mold change cycle, and transmits the standard time to the equipment system.

[0040] The running time of different material number car platform is:

[0041] When the order material number of the car platform is 54xxxNxx, the preventive mold change cycle is 240 hours;

[0042] When the order material number of the car platform is 54xxxHxx, the preventive mold change cycle is 192 hours;

[0043] When the order material number of the car platform is 54xxxSxx, the preventive mold change cycle is 96 hours;

[0044] When the order material number of the car platform is 54xxxUxx, the preventive mold change cycle is 72 hours.

[0045] Step 2: The PLC data acquisition system captures the actual running time of each car, and transmits the actual running time to the equipment system.

[0046] Step 3: The equipment system collects information according to the specifications of the car platform, compares the actual running time of each car with the standard time according to the material number of the order hung by each car platform, and judges whether the mold change time is reached.

[0047] Among them, the comparison of the actual running time of each car with the standard time is based on the equipment system to capture the total number of molds in the mold change report, and the total number of molds is between 4 and 17, and the corresponding car number is replaced in turn according to the mold change cycle 1+4(B) to 1+4(F), when the "intermediate mold quantity" captured is greater than or equal to 18, the mold change is restarted from 1+4(B), the starting mold change cycle is obtained from the "stop mold change report", and the subsequent is sequentially continued according to the data of "mold change car platform report"; the small cycle is replaced in the production process due to abnormal reasons, and the starting time of the planned small cycle mold change is calculated again according to the abnormal small cycle time, so as to improve the mold utilization rate.

[0048] Step 4: The equipment system obtains the information of the car platform that needs to be changed and carries out statistics, and captures the key information of each specification in the MES system, automatically summarizes into a report form, and makes a mold change report; the mold change report can be displayed through a handheld machine or a display, and the mold change report displays the mold sequence that needs to be replaced.

[0049] The mold changing report is a mold changing vehicle station report, and the mold changing vehicle station report template includes six kinds of reports: full set (A), 1+4 (B), 1+4 (C), 1+6 (D), 1+4 (E), and 1+4 (F); the number of mold changes of the full set (A) is 26, the number of mold changes of the 1+4 (B), 1+4 (C), 1+4 (E), and 1+4 (F) is 8, and the number of mold changes of the 1+6 (D) is 10. The full set (A), 1+4 (B), 1+4 (C), 1+6 (D), 1+4 (E), and 1+4 (F) are defined as six-step mold changing cycles, as shown in Figure 2 When the last mold change on the machine is A, the user should be informed to change the mold in the B mode when the current period expires; if the mold is changed in advance, it is considered to have been changed in the B mode, and the next period starts to be calculated, and the next time the machine is prompted to change the mold in the C mode; the mold changing period between each two is 72 / 96 / 192 / 240 hours.

[0050] The 72 / 96 / 192 / 240 hours correspond to the specification strength of UT (ultra-super strength), ST (ultra-high strength), HT (high strength), and NT (ordinary strength), respectively; taking UT as an example, the mold changing period between the full set (A) and 1+4 (B) is 72 hours, and the mold changing period between 1+4 (B) and 1+4 (C) is 72 hours. Taking ST as an example, the mold changing period between the full set (A) and 1+4 (B) is 96 hours, and the mold changing period between 1+4 (B) and 1+4 (C) is 96 hours.

[0051] Step 5: The operator manually changes the mold of the vehicle station according to the data of the report, and after the mold is changed, logs in the device system through the handheld machine, registers and manually enters the vehicle station number and time after the mold is changed into the device system.

[0052] After the operator manually enters the vehicle station number and time after the mold is changed into the device system, the system automatically analyzes the difference between the system prompt mold changing time and the manual actual mold changing time, and monitors whether the actual mold changing time is advanced or delayed; the calculation logic of the difference between the system prompt mold changing time and the manual actual mold changing time is that the manual actual mold changing time is subtracted from the system prompt mold changing time, and the positive difference value indicates that the actual mold changing time is delayed, and the negative difference value indicates that the actual mold changing time is advanced.

[0053] Step 6: The device system synchronizes the mold changing registration time to the “actual mold changing time” in the mold changing report; at the same time, after receiving the manually entered vehicle station number and time after the mold is changed, the device system re-calculates the running time of the corresponding vehicle station;

[0054] Step 7: The operation steps of steps 2 to 6 are cycled.

[0055] The actual running time of the car platform is used for preventive die change cycle. When the running time of the car platform of the order reaches the set value, preventive die change is performed, and the equipment system will count the car platforms that need to be changed and form a report summary. The report summary is shown in the following table, and the report example is Figure 3

[0056] Table 1 Die Change Car Platform Report Template

[0057]

[0058]

[0059] Each item in the report summary can be individually screened, and the screened report can be entered into the following table:

[0060] Table 2 Screened Report

[0061]

[0062] Case 1:

[0063] The material number of the wet drawing car platform A is 54225N00. When the running time of the car platform reaches 240 hours, the report will be formed in the equipment system to remind the car platform that needs to be changed. After manual die change, the corresponding car platform information is registered. The equipment system will automatically summarize the registered car platform information into the original report, and compare the time of the car platform that needs to be changed with the car platform that has been changed after registration, so as to understand the execution of the die change. By grabbing the actual running time of the car platform instead of the natural time cycle for preventive die change, the actual running time of the car platform is used for preventive die change, and the natural time cycle is used for preventive die change. The comparison of the two methods is shown in the following table:

[0064] Table 3 Natural Time Cycle for Preventive Die Change Parameters

[0065]

[0066]

[0067] Table 4 Actual Running Time of Car Platform for Preventive Die Change Parameters

[0068]

[0069] ​From the parameters of Table 3 and Table 4, it can be obtained that the mold changing mode of the actual running time of the grabbing trolley table for preventive mold changing and the natural time period for preventive mold changing is: full set-1+4-1+4-1+6-1+4-1+4-full set, each interval is 4 days, and a cycle is 24 days. The theoretical mold consumption = the number of theoretical mold changing in a cycle / the total yield in a cycle. For the test structure, the mold consumption under the natural cycle is 12.464, and the mold consumption under the actual running cycle of the trolley table is 8.725. The mold consumption is reduced from 12.464 grains / ton to 8.725 grains / ton, and the mold consumption is reduced by 30%. The mold utilization rate under the natural cycle is 0.70, and the mold utilization rate under the actual running cycle of the trolley table is 1; the mold utilization rate is maximized.

[0070] Case 2:

[0071] The current order material number of the wet drawing trolley table B is 54225U00. When the data collection system collects the running time of the trolley table to reach 72 hours, a report reminding the trolley table number that needs to be changed will be formed in the device system. After manual mold changing, the corresponding trolley table information is registered. At this time, the device system will automatically summarize the registered trolley table information into the original report, and compare the time of the mold changing trolley table and the registered mold changed trolley table, so as to understand the execution of the mold changing and maximize the utilization rate of the mold.

[0072] By distinguishing the running time of the trolley table of different material number types of 54xxxNxx, 54xxxHxx, 54xxxSxx and 54xxxUxx, the corresponding trolley table can be accurately reminded to change the mold within a specified time, effectively improving the utilization rate of the mold and reducing the production cost.

[0073] In order to verify the effectiveness and advantages of the above scheme, the applicant carries out a test, and the specific test process and data analysis are as follows:

[0074] Test title:

[0075] 1. 90ST-0.295ST specification mold changing test according to the actual running time of the trolley table instead of the natural time

[0076] Test purpose:

[0077] Reduce the mold consumption of wet drawing and save the production cost.

[0078] Test expectation:

[0079] The performance of the steel wire meets the production requirements.

[0080] Test scheme:

[0081] The test is carried out on the 1.90ST-0.295ST mold chain, and the test content includes:

[0082] 1) Select 4 groups of car platform for synchronous verification;

[0083] 2) Detect the performance data of steel wire;

[0084] 3) Detect the pass compression rate of the used die chain;

[0085] 4) Determine the actual running time.

[0086] Data arrangement:

[0087] 1. According to the actual running time, the die change test data statistics

[0088]

[0089]

[0090] Note: The microscope test results in the above table are represented by letters, and each letter represents different internal phenomena of the die. A: The sizing band is complete, and there is no drawing circle in the compression zone; B: The sizing band is complete, and there is a drawing circle in the compression zone; C: The sizing band has slight scratches, and the compression zone has a drawing circle ring, with slight scratches or no scratches; D: The sizing band has obvious scratches, and the compression zone has a drawing circle ring and obvious scratches; E: The sizing band has very deep scratches, and the compression zone has a drawing circle ring and very deep scratches; F: The sizing band is pulled off; G: Burst; H: Blockage.

[0091] From the above table data, it can be understood that: 1.90ST-0.295ST test specifications are based on the actual running time of the car platform as the cycle die change, and there is no burst and blockage phenomenon of the die, and according to the single wire data performance, the overall damage degree of the die can be accepted.

[0092] 2. Take the average of 4 groups of experimental die chain specifications to calculate the pass compression rate--steel wire wear

[0093]

[0094] From the above table data, it can be understood that: the diameter size of each specification of the test die chain is not abnormally increased, and the pass compression rate is within the control range by comparing with the designed die chain specification. The analysis of the experimental die chain of 90ST-0.295ST is as Figure 4 described, from Figure 4 which it can be understood that: the pass compression rate of the used die meets the requirements and is not much different from the initial design die chain pass.

[0095] 3. Calculate the pass compression rate

[0096]

[0097]

[0098] From the above table data can be understood: using the mold chain compression rate calculation method to express, so that more intuitive to see the degree of wear of the mold; test mold chain each specification wire diameter size no abnormal increase, by comparing with the design mold chain specification each pass compression rate within the control range.

[0099] The actual running time of the grabbing car platform is compared with the natural time period of the preventive mold change, and the steel wire produced by the car platform is compared with the single wire twist performance, and the comparison result is shown in Figure 5 From Figure 5 It can be understood that: this data is used to compare whether there is a significant difference in single wire twist under two test conditions, and the single wire plasticity under natural time period is better than that under running time, but there is no significant difference, so it meets the single wire performance requirements.

[0100] N Mean Standard Deviation Standard Error Twist - Natural Time Period 7 121.9 26.1 9.9 Twist - Run Time Period 7 115.14 9.77 3.7

[0101] N in the above table represents the data of the detected steel wire, and here only the significant analysis of the data is performed, and there is no significant difference.

[0102] Difference = μ (twist-natural time period) - μ (twist-running time period);

[0103] Difference estimate: 6.7;

[0104] 95% confidence interval of difference: (-18.2, 31.6);

[0105] Difference = 0, T test of (≠): T value = 0.64, P value = 0.544, degree of freedom = 7.

[0106] The single wire breaking performance of the steel wire produced by the grabbing car platform with actual running time preventive mold change and natural time period preventive mold change is compared, and the comparison result is shown in Figure 6 From Figure 6 It can be understood that: this data is used to compare whether there is a significant difference in single wire breaking under two test conditions, and the single wire breaking under natural time period is greater than that under running time, but there is no significant difference, so it meets the single wire performance requirements.

[0107] N Mean Standard Deviation Standard Error Break - Natural Time Period 7 250.29 3.25 1.2 Break - Run Time Period 7 245.86 4.74 1.8

[0108] N represents the data of the detected steel wire, and here only the significant analysis of the data is performed, and there is no significant difference.

[0109] Difference = μ (break-natural time period) - μ (break-running time period);

[0110] Difference estimate: 4.43;

[0111] 95% confidence interval for the difference: (-0.41, 9.27);

[0112] Difference = 0, T-test for ≠: T = 2.04, P = 0.069, degrees of freedom = 10.

[0113] After the preventive die change mode using the actual running time of the grabbing platform, the die consumption change trend is as shown in Figure 7 From Figure 7 It can be understood that after the die change according to the actual running time of the platform as the period, the die consumption (the number of dies needed for producing one ton of products) presents a downward trend.

[0114] Test conclusion:

[0115] From the above experimental data, the following conclusions can be obtained: 1. The pass elongation rate after the die change according to the actual running time of the platform has certain fluctuation but is within the control range, which meets the production standard. 2. The single wire twist P value is 0.544>0.05 and the single wire breakage P value is 0.069>0.05 under the die change mode of different periods, so the two die change modes have no significant difference in the performance of the steel wire. 3. The actual running time of the platform can be used to replace the natural time for the period die change.

[0116] The above embodiments are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent transformation or modification according to the spirit and essence of the present application should be covered in the present application.

Claims

1. A mold-changing method based on the actual running time of the vehicle platform, characterized in that: Including the following steps: Step 1: The EMS system provides information on various specifications, calculates the run-time of different material number car units based on the information on various specifications, uses it as the standard time to prevent mold change cycles, and transmits the standard time to the equipment system; Step 2: The PLC data acquisition system captures the actual running time of each vehicle and transmits the actual running time to the equipment system; Step 3: The equipment system summarizes information based on the vehicle specifications, and compares the actual running time of each vehicle with the standard time based on the material number of the order attached to each vehicle to determine whether the mold change time has been reached. Step 4: The equipment system obtains and compiles the information of the mold changing machine, and at the same time captures the key information of each specification in the MES system, automatically summarizes it into a report, and creates a mold changing report. Step 5: The operator manually changes the mold on the machine that needs to be changed according to the data in the report. After changing the mold, the operator logs into the equipment system through a handheld device, registers and manually enters the machine number and time after the mold change into the equipment system. Step 6: The equipment system synchronizes the mold change registration time to the "actual mold change time" in the mold change report; at the same time, after receiving the manually entered machine number and time after the mold change, the equipment system recalculates the machine running time for the corresponding machine number. Step 7: Repeat steps 2 through 6.

2. The mold-changing method based on the actual running time of the vehicle platform according to claim 1, characterized in that: The run time for the different material number carts mentioned in step 1 is: When the order material number on the machine is 54xxxNxx, the mold change cycle is 240 hours. When the material number of the order attached to the machine is 54xxxHxx, the mold change cycle is 192 hours. When the order material number on the machine is 54xxxSxx, the mold change cycle is 96 hours. When the order material number on the machine is 54xxxUxx, the mold change cycle is 72 hours.

3. The mold-changing method based on the actual running time of the vehicle platform according to claim 1, characterized in that: Step 3, comparing the actual running time of each vehicle with the standard time, is based on the total number of molds in the mold-changing vehicle report retrieved by the equipment system. The total number of molds is between 4 and 17. The corresponding vehicle number is changed sequentially according to the mold change cycle from 1+4 (B) to 1+4 (F). When the retrieved "intermediate mold quantity" is greater than or equal to 18, the mold change starts again from changing 1+4 (B). The initial mold change cycle is retrieved from the "stopping mold change report", and subsequent cycles are continued sequentially based on the data in the "mold-changing vehicle report". If a small cycle is changed due to abnormal reasons during production, the planned small cycle mold change start time is recalculated based on the abnormal small cycle change time to improve mold utilization.

4. The mold-changing method based on the actual running time of the vehicle platform according to claim 1, characterized in that: The mold change report mentioned in step 4 is a mold change vehicle report. The templates for the mold change vehicle report include six types: full set (A), 1+4 (B), 1+4 (C), 1+6 (D), 1+4 (E), and 1+4 (F). The full set (A) has 26 mold changes, the 1+4 (B), 1+4 (C), 1+4 (E), and 1+4 (F) have 8 mold changes, and the 1+6 (D) has 10 mold changes.

5. The mold changing method based on the actual running time of the vehicle platform according to claim 4, characterized in that: The complete set (A), 1+4 (B), 1+4 (C), 1+6 (D), 1+4 (E), and 1+4 (F) are defined as a six-step cyclic mold change. When the last mold change on the machine is A, the user should be informed to change the mold according to method B when the current expiration date arrives. If the mold is changed in advance, it will be considered as if it has been changed according to method B, and the next cycle will be calculated. When the next cycle expires, you will be prompted to change the mold according to method C.

6. The mold changing method based on the actual running time of the vehicle platform according to claim 1, characterized in that: The mold change report mentioned in step 4 can be displayed on a handheld device or a monitor, and the mold change report shows the mold sequence that needs to be replaced.

7. The mold-changing method based on the actual running time of the vehicle platform according to claim 1, characterized in that: After the operator manually enters the machine number and time after mold change into the equipment system via a handheld device as described in step 5, the system automatically analyzes the difference between the mold change time prompted by the system and the actual mold change time manually, and monitors whether the actual mold change time is completed ahead of schedule or behind schedule.

8. The mold changing method based on the actual running time of the vehicle platform according to claim 7, characterized in that: The calculation logic for the difference between the system-prompted mold change time and the actual manual mold change time is as follows: the actual manual mold change time minus the system-prompted mold change time. If the difference is positive, the actual mold change time is delayed; if the difference is negative, the actual mold change time is advanced.

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