CN110987484B - Indoor testing method for endurance performance of belt ply of tire - Google Patents
Indoor testing method for endurance performance of belt ply of tire Download PDFInfo
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- CN110987484B CN110987484B CN201911371216.8A CN201911371216A CN110987484B CN 110987484 B CN110987484 B CN 110987484B CN 201911371216 A CN201911371216 A CN 201911371216A CN 110987484 B CN110987484 B CN 110987484B
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Abstract
The invention discloses an indoor testing method for endurance performance of a belt layer of a tire, which comprises the following steps of S1: tire inflation: carrying out nondestructive testing on the test tire, mounting the test tire on a measuring rim, and filling gas of standard air pressure corresponding to the maximum rated load of a single tire; s2: and (3) parking the tire: parking the test tire; s3: and (3) drum test: the combination body of the test tire and the measuring wheel rim is arranged on a rotary drum testing machine, the loading load and the rotary drum speed of the test tire are set on the rotary drum testing machine, the lateral force is applied to the test tire, and the test is carried out in stages until the tire is damaged. Compared with the prior art, the lateral force applied to the tire by the prior art is larger, and the difference between the lateral force applied to the tire by the prior art and the lateral force borne by the tire in actual use is larger, so that the test conditions of the prior art are relatively harsh; meanwhile, in the prior art, the tire tread needs to be polished, and the influence of tire tread heat generation on the durability of the belt ply is neglected in the test after the tire tread is polished, so the test result is not objective.
Description
Technical Field
The invention belongs to the technical field of tire performance testing, and particularly relates to an indoor testing method for endurance performance of a belt ply of a tire.
Background
The belted layer is one of main framework materials of an all-steel radial tire, is a main stressed part of the tire, plays a key role in ensuring that the tire obtains high driving mileage, and has the performances of durability, safety, good control performance, repeated retreading and the like, and the durability of the belted layer directly affects the service life of the tire.
With the increasing demand of the market on tires, the development efficiency of new products is improved, and the ways for testing the tire performance are gradually diversified, one of which is the durability test of the belt layer.
Disclosure of Invention
The object of the present invention is to provide an indoor test method for the endurance performance of the belt of a tire, which overcomes the above technical problems.
The technical purpose of the invention is realized by the following technical scheme:
an indoor test method for endurance performance of a belt layer of a tire comprises the following steps,
s1: tire inflation: carrying out nondestructive testing on the test tire on a nondestructive testing machine, mounting the test tire meeting the requirements on a measuring rim, and filling gas of standard air pressure corresponding to the maximum rated load of a single tire;
s2: and (3) parking the tire: standing the inflated test tire for more than 3 hours at the ambient temperature of 38 +/-3 ℃;
s3: and (3) drum test: the method comprises the steps of installing a combination body of a test tire and a measuring rim on a rotary drum testing machine, setting the loading load and the rotary drum speed of the test tire on the rotary drum testing machine, simulating the acting force of a road surface on the tire in the Y-axis direction through the rotary drum testing machine, continuously applying lateral force to the test tire, testing in stages until the tire is damaged, and stopping the machine to perform appearance inspection when each stage is completed before the tire is damaged.
Further, in step S3, the application of the lateral force is performed in the following manner: setting the maximum lateral force of a tested tire, setting a certain testing time as a control period, and applying the lateral force in a continuous and uninterrupted manner by taking the control period as a basic unit until the testing time of each stage is finished; setting the magnitude of the lateral force by taking the test time as the progress in each control period, wherein the time for the lateral force to increase from zero to the set maximum lateral force is set as T1Setting the time for maintaining the maximum lateral force to be T2Setting the time from the maximum lateral force decreasing to zero as T3And setting the time T for keeping the lateral force to zero4。
Further, the maximum lateral force of the test tire is 15% -30% of the maximum rated load of a single tire.
Further, the test time per control cycle is 60s, where T1Is 20s, T2Is 10s, T3Is 20s, T4Is 10 s.
Further, in step S3, the specific process of performing the test in stages is as follows: according to the set loading load, the drum speed and the lateral force, the test time of the first stage is set to be 12 hours, each stage after the first stage keeps the same test condition as the first stage, the test time is set to be 4-6 hours until the tire is damaged, and the machine needs to be stopped for appearance inspection when each stage is completed.
Further, in step S3, the load is 80% to 120% of the maximum rated load of the single tire.
Further, in step S3, the rotating drum speed is 30-60 km/h.
Further, in step S2, the distance between the monitoring point of the environmental temperature and the parking position of the tested tire is required to be kept between 145mm and 155 mm.
Has the advantages that:
the test method adopted by the invention can determine the test time according to the damage condition of the tire, and the test time is used for evaluating the endurance performance of the belt layers with different specifications, and meanwhile, the test method can also be used for judging the endurance performance of the belt layers before and after the improvement of the same specification tire; compared with the prior art, the test time is fixed to 12h, and the comparative examples 1-2 show that the test tires can run for 12h without damage on appearance, so that the defects in the tires need to be detected through a nondestructive test, the tires with different specifications before and after improvement or different specifications need to be tested under the condition of the defects, the tire section needs to be detected under the condition of consistent defect conditions, and the tests are carried out through comparison of the fracture length of the end points of the belt layer;
secondly, compared with the prior art, the lateral force applied to the tire by the prior art is larger, and the difference between the lateral force applied to the tire by the prior art and the lateral force born by the tire in actual use is larger, so that the test conditions of the prior art are relatively harsh; meanwhile, in the prior art, the tire tread needs to be polished, and the test after the tire tread is polished is equivalent to neglecting the influence of the heat generation of the tire tread on the durability of the belted layer, so that the test result of the existing test method is not objective;
finally, the lateral force is controlled to be between 15% and 30%, the loading load is controlled to be between 80% and 120%, and the purpose is that when the lateral force and the loading load are smaller, the test time is prolonged, the occupied test resources are more, and the test efficiency is lower; if the lateral force and loading load are too great, the time for tire damage is short, and when product improvement or competitive product comparison is carried out, the time difference is small, so that the resolution of belt comparison is low.
Drawings
FIG. 1 is a graph of the application of lateral force versus test time in accordance with the present invention;
Detailed Description
In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "front", "rear", and the like, indicate orientations or positional relationships only for the purpose of describing the present invention and simplifying the description, but do not indicate or imply that the designated device or structure must have a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention relates to an indoor testing method for endurance performance of a belt ply of a tire, which comprises the following steps,
s1: tire inflation: carrying out nondestructive testing on the test tire on a nondestructive testing machine to ensure that the tire has no defects of delaminating, air bubbles and the like, mounting the test tire meeting the requirements on a measuring rim, and filling gas of standard air pressure corresponding to the maximum rated load of a single tire;
s2: and (3) parking the tire: parking the inflated test tire for more than 3 hours at the ambient temperature of 38 +/-3 ℃, wherein the distance between a monitoring point of the ambient temperature and the parking position of the test tire needs to be kept at 145-155 mm;
s3: and (3) drum test: the method comprises the steps of installing a combination body of a test tire and a measuring rim on a rotary drum testing machine, setting a loading load and a rotary drum speed of the test tire on the rotary drum testing machine, wherein the loading load is 80% -120% of the maximum rated load of a single tire, the rotary drum speed is 30-60 km/h, simulating the acting force of a road surface on the tire in the Y-axis direction through the rotary drum testing machine, and continuously applying a lateral force to the test tire; the test is carried out by stages, and the specific process is as follows: according to the set loading load, the drum speed and the lateral force, the test time of the first stage is set to be 12 hours, each stage after the first stage keeps the same test condition as the first stage, the test time is set to be 4-6 hours until the tire is damaged, and the machine needs to be stopped for appearance inspection when each stage is completed. In step S3, the application of the lateral force is performed in the following manner: setting the maximum lateral force of a test tire to be 15% -30% of the maximum rated load of a single tire, setting a certain test time to be a control period, and applying the lateral force in a continuous and uninterrupted manner by taking the control period as a basic unit until the test time of each stage is finished; setting the magnitude of the lateral force by taking the test time as the progress in each control period, wherein the time for the lateral force to increase from zero to the set maximum lateral force is set as T1Setting the time for maintaining the maximum lateral force to be T2Setting the time from the maximum lateral force decreasing to zero as T3And setting the time T for keeping the lateral force to zero4Preferably, the test time per control cycle is 60s, where T1Is 20s, T2Is 10s, T3Is 20s, T4Is 10 s.
Example 1
An indoor test method for endurance performance of a belt layer of a tire comprises the following steps,
s1: tire inflation: carrying out nondestructive testing on the test tire on a nondestructive testing machine, mounting the test tire meeting the requirements on a measuring rim, and filling gas of standard air pressure corresponding to the maximum rated load of a single tire;
s2: and (3) parking the tire: parking the inflated test tire for 3 hours at the environment temperature of 35 ℃, wherein the distance between the monitoring point of the environment temperature and the parking position of the test tire needs to be kept at 150 mm;
s3: and (3) drum test: the method comprises the following steps of mounting a combination body of a test tire and a measuring rim on a rotary drum testing machine, setting a loading load and a rotary drum speed of the test tire on the rotary drum testing machine, wherein the loading load is the maximum rated load of a single tire, the rotary drum speed is 60km/h, simulating acting force of a road surface on the tire in the Y-axis direction through the rotary drum testing machine, and continuously applying lateral force to the test tire; the test is carried out by stages, and the specific process is as follows: according to the set loading load, the drum speed and the lateral force, the test time of the first stage is set to be 12h, each stage after the first stage keeps the same test condition as the first stage, the test time is set to be 4h until the tire is damaged, and the machine needs to be stopped for appearance inspection when each stage is completed; in step S3, the application of the lateral force is performed in the following manner: setting the maximum lateral force of a tested tire to be 30% of the maximum rated load of a single tire, setting a certain testing time to be a control period, and applying the lateral force in a continuous and uninterrupted manner by taking the control period as a basic unit until the testing time of each stage is finished; setting the magnitude of the lateral force by taking the test time as the progress in each control period, wherein the time for the lateral force to increase from zero to the set maximum lateral force is set as T1Setting the time for maintaining the maximum lateral force to be T2Setting the time from the maximum lateral force decreasing to zero as T3And setting the time T for keeping the lateral force to zero4Preferably, the test time per control cycle is 60s, where T1Is 20s, T2Is 10s, T3Is 20s, T4The time is 10s, see table 1.
Example 2
An indoor test method for endurance performance of a belt layer of a tire comprises the following steps,
s1: tire inflation: carrying out nondestructive testing on the test tire on a nondestructive testing machine, mounting the test tire meeting the requirements on a measuring rim, and filling gas of standard air pressure corresponding to the maximum rated load of a single tire;
s2: and (3) parking the tire: parking the inflated test tire for 4 hours at the ambient temperature of 38 ℃, wherein the distance between the monitoring point of the ambient temperature and the parking position of the test tire needs to be kept at 155 mm;
s3: and (3) drum test: the method comprises the following steps of (1) mounting a combination body of a test tire and a measuring rim on a rotary drum testing machine, setting a loading load and a rotary drum speed of the test tire on the rotary drum testing machine, wherein the loading load is the maximum rated load of a single tire multiplied by 0.8, the rotary drum speed is 45km/h, simulating an acting force of a road surface on the tire in the Y-axis direction through the rotary drum testing machine, and continuously applying a lateral force to the test tire; the test is carried out by stages, and the specific process is as follows: according to the set loading load, the drum speed and the lateral force, the test time of the first stage is set to be 12h, each stage after the first stage maintains the same test condition as the first stage, the test time is set to be 6h until the tire is damaged, and the machine is stopped for appearance inspection every time one stage is completed. In step S3, the application of the lateral force is performed in the following manner: setting the maximum lateral force of a tested tire to be 20% of the maximum rated load of a single tire, setting a certain testing time to be a control period, and applying the lateral force in a continuous and uninterrupted manner by taking the control period as a basic unit until the testing time of each stage is finished; setting the magnitude of the lateral force by taking the test time as the progress in each control period, wherein the time for the lateral force to increase from zero to the set maximum lateral force is set as T1Setting the time for maintaining the maximum lateral force to be T2Setting the time from the maximum lateral force decreasing to zero as T3And setting the time T for keeping the lateral force to zero4Preferably, the test time per control cycle is 60s, where T1Is 20s, T2Is 10s, T3Is 20s, T4The time is 10s, see table 1.
Example 3
An indoor test method for endurance performance of a belt layer of a tire comprises the following steps,
s1: tire inflation: carrying out nondestructive testing on the test tire on a nondestructive testing machine, mounting the test tire meeting the requirements on a measuring rim, and filling gas of standard air pressure corresponding to the maximum rated load of a single tire;
s2: and (3) parking the tire: parking the inflated test tire for 3 hours at the ambient temperature of 41 ℃, wherein the distance between the monitoring point of the ambient temperature and the parking position of the test tire needs to be kept at 145 mm;
s3: and (3) drum test: the method comprises the following steps of (1) mounting a combination body of a test tire and a measuring rim on a rotary drum testing machine, setting a loading load and a rotary drum speed of the test tire on the rotary drum testing machine, wherein the loading load is the maximum rated load of a single tire multiplied by 1.2, the rotary drum speed is 30km/h, simulating an acting force of a road surface on the tire in the Y-axis direction through the rotary drum testing machine, and continuously applying a lateral force to the test tire; the test is carried out by stages, and the specific process is as follows: according to the set loading load, the drum speed and the lateral force, the test time of the first stage is set to be 12h, each stage after the first stage maintains the same test condition as the first stage, the test time is set to be 6h until the tire is damaged, and the machine is stopped for appearance inspection every time one stage is completed. In step S3, the application of the lateral force is performed in the following manner: setting the maximum lateral force of a test tire to be 15% of the maximum rated load of a single tire, setting a certain test time to be a control period, and applying the lateral force in a continuous and uninterrupted manner by taking the control period as a basic unit until the test time of each stage is finished; setting the magnitude of the lateral force by taking the test time as the progress in each control period, wherein the time for the lateral force to increase from zero to the set maximum lateral force is set as T1Setting the time for maintaining the maximum lateral force to be T2Setting the time from the maximum lateral force decreasing to zero as T3And setting the time T for keeping the lateral force to zero4Preferably, the test time per control cycle is 60s, where T1Is 20s, T2Is 10s, T3Is 20s, T4The time is 10s, see table 1.
Comparative example 1
An indoor test method for endurance performance of a belt layer of a tire, comprising the steps of: (1) carrying out nondestructive testing on the test tire before testing; (2) polishing the crown of the tire of the test wheel to the position of the abrasion mark, namely keeping the rubberizing thickness of the belt ply to be 7mm, and enabling the crown arc to be consistent with the crown arc before polishing as much as possible; (3) mounting the test tire meeting the requirements on a measuring rim, inflating the test tire to the maximum rated standard air pressure of a single tire, and standing the test tire for 3 hours at the temperature of 38 ℃; (4) adjusting the air pressure of the parked tire to a required value and then parking for 15 min; (5) the tire and rim assembly was mounted on a drum tester and the test was started according to the test procedures set forth in table 1; (6) after the 12h test is finished, the tire is detached from the rim, firstly, the appearance of the tire needs to be checked, and secondly, nondestructive testing is carried out to determine whether defects such as delamination, bubbles and the like exist in the tire.
Comparative example 2
An indoor test method for endurance performance of a belt layer of a tire, comprising the steps of: (1) carrying out nondestructive testing on the test tire before testing; (2) polishing the crown of the tire of the test wheel to the position of the abrasion mark, namely keeping the rubberizing thickness of the belt ply to be 10mm, and enabling the crown arc to be consistent with the crown arc before polishing as much as possible; (3) mounting the test tire meeting the requirements on a measuring rim, inflating the test tire to the maximum rated standard air pressure of a single tire, and standing the test tire for 4 hours at the temperature of 35 ℃; (4) adjusting the air pressure of the parked tire to a required value and then parking for 15 min; (5) the tire and rim assembly was mounted on a drum tester and the test was started according to the test procedures set forth in table 1; (6) after the 12h test is finished, the tire is detached from the rim, firstly, the appearance of the tire needs to be checked, and secondly, nondestructive testing is carried out to determine whether defects such as delamination, bubbles and the like exist in the tire.
TABLE 1
Wherein TRA refers to trapezoidal waves, see fig. 1.
The drum times and tire damage patterns of examples 1-3 and comparative examples 1-2 were counted and the data is shown in Table 2 below.
TABLE 2
| Time of tumbling | Form of damage to a tyre | |
| Example 1 | 27h | Upper die groove bottom split |
| Example 2 | 35h | Upper die groove bottom split |
| Example 3 | 42h | Upper die groove bottom split |
| Comparative example 1 | 12h | The tire has good appearance and nondestructive testing shows that the end point of the belted layer has air bubbles |
| Comparative example 2 | 12h | The tire has good appearance and nondestructive testing shows that the end point of the belted layer has air bubbles |
As can be seen from Table 2, the appearance of the test tire can be damaged within a certain period of time by the present invention, so that the test time of the test tire can be determined, and the judgment can be made by the present invention when the comparison between the tire and the competitive products is improved; while comparative examples 1-2 showed no change in appearance over the test period, it was necessary to determine the condition in the tire by a non-destructive testing experiment.
In order to make the objects, technical solutions and advantages of the present invention more concise and clear, the present invention is described with the above specific embodiments, which are only used for describing the present invention, and should not be construed as limiting the scope of the present invention. It should be understood that any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. An indoor test method for endurance performance of a belt layer of a tire is characterized by comprising the following steps,
s1: tire inflation: carrying out nondestructive testing on the test tire on a nondestructive testing machine, mounting the test tire meeting the requirements on a measuring rim, and filling gas of standard air pressure corresponding to the maximum rated load of a single tire;
s2: and (3) parking the tire: standing the inflated test tire for more than 3 hours at the ambient temperature of 38 +/-3 ℃;
s3: and (3) drum test: the method comprises the following steps of installing a combination body of a test tire and a measuring rim on a rotary drum testing machine, setting the loading load and the rotary drum speed of the test tire on the rotary drum testing machine, simulating the acting force of a road surface on the tire in the Y-axis direction through the rotary drum testing machine, continuously applying lateral force to the test tire, carrying out tests in stages until the tire is damaged, and stopping the machine to carry out appearance inspection when each stage is finished before the tire is damaged;
in step S3, the application of the lateral force is performed in the following manner: setting trialTesting the maximum lateral force of the tire, setting a certain test time as a control period, and applying the lateral force in a continuous and uninterrupted manner by taking the control period as a basic unit until the test time of each stage is finished; setting the magnitude of the lateral force by taking the test time as the progress in each control period, wherein the time for the lateral force to increase from zero to the set maximum lateral force is set as T1Setting the time for maintaining the maximum lateral force to be T2Setting the time from the maximum lateral force decreasing to zero as T3And setting the time T for keeping the lateral force to zero4。
2. An indoor test method for belt endurance performance of a tire according to claim 1, wherein the maximum lateral force of the test tire is 15% to 30% of the maximum rated load of a single tire.
3. An indoor test method for the belt endurance of a tire according to claim 1, wherein the test time per control cycle is 60s, where T is1Is 20s, T2Is 10s, T3Is 20s, T4Is 10 s.
4. An indoor test method for the belt durability of a tire according to claim 1, wherein in step S3, the specific process of conducting the test in stages is: according to the set loading load, the drum speed and the lateral force, the test time of the first stage is set to be 12 hours, each stage after the first stage keeps the same test condition as the first stage, the test time is set to be 4-6 hours until the tire is damaged, and the machine needs to be stopped for appearance inspection when each stage is completed.
5. The indoor test method for belt endurance of a tire according to claim 1, wherein in step S3, said load is 80% to 120% of maximum rated load of single tire.
6. An indoor test method for durability of a belt of a tire according to claim 1, wherein in step S3, the drum speed is 30 to 60 km/h.
7. An indoor test method for endurance of a belt of a tire according to claim 1, wherein in the step S2, the distance between the monitoring point of the ambient temperature and the parking position of the test tire is maintained at 145 to 155 mm.
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