CN113702437B - Tire low rolling resistance formula design test method - Google Patents
Tire low rolling resistance formula design test method Download PDFInfo
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- CN113702437B CN113702437B CN202111170296.8A CN202111170296A CN113702437B CN 113702437 B CN113702437 B CN 113702437B CN 202111170296 A CN202111170296 A CN 202111170296A CN 113702437 B CN113702437 B CN 113702437B
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- 238000005096 rolling process Methods 0.000 title claims abstract description 38
- 238000013461 design Methods 0.000 title claims abstract description 21
- 238000010998 test method Methods 0.000 title claims abstract description 19
- 238000004073 vulcanization Methods 0.000 claims abstract description 73
- 238000012360 testing method Methods 0.000 claims abstract description 66
- 239000000463 material Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 28
- 229920001971 elastomer Polymers 0.000 claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 18
- 239000005060 rubber Substances 0.000 claims abstract description 18
- 238000004513 sizing Methods 0.000 claims abstract description 16
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 12
- 238000004458 analytical method Methods 0.000 claims abstract description 8
- 239000006229 carbon black Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 8
- 238000010057 rubber processing Methods 0.000 claims description 7
- 230000004913 activation Effects 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 229920003051 synthetic elastomer Polymers 0.000 claims description 6
- 239000005061 synthetic rubber Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000005062 Polybutadiene Substances 0.000 claims description 3
- 241000872198 Serjania polyphylla Species 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 230000003712 anti-aging effect Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 229920002857 polybutadiene Polymers 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 3
- 238000011161 development Methods 0.000 abstract description 10
- 238000009472 formulation Methods 0.000 description 13
- 239000000203 mixture Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000004636 vulcanized rubber Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000012395 formulation development Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
- G01N25/48—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on solution, sorption, or a chemical reaction not involving combustion or catalytic oxidation
- G01N25/4846—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on solution, sorption, or a chemical reaction not involving combustion or catalytic oxidation for a motionless, e.g. solid sample
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
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Abstract
The invention discloses a tire low rolling resistance formula design test method, which comprises the specific steps of obtaining tire manufacturing materials; repeatedly acquiring vulcanization temperature history data in a tire vulcanization period by a tire vulcanization temperature data acquisition method, wherein the tire vulcanization temperature data acquisition method comprises a thermocouple buried wire temperature measurement test method and an FEA finite element analysis method; preparing a low rolling resistance formula at different stages according to temperature data in a tire vulcanization period to obtain an optimized tire sizing material formula; and (3) vulcanizing and testing the tire finished product of the tire test product according to the optimized tire sizing material formula, and analyzing the test result. According to the invention, temperature data acquisition is carried out on the vulcanization temperature history, new vulcanization conditions are formed after fitting is carried out on the data, the dynamic viscosity test parameters are obtained by vulcanizing the new formula rubber material, and whether the design formula meets the design is determined. The test result can be close to the tire finished product result, the formula development period is shorter, and the cost is lower.
Description
Technical Field
The invention relates to the technical field of tire and rubber processing, in particular to a tire low rolling resistance formula design test method.
Background
When the formula is in low rolling resistance, the process of small matching, large sample trial production, tyre trial production and the like is required, and the process can be repeated for a plurality of times according to development progress and effect part stages. The performance of the new formulation is confirmed mainly in the small matching and large sample trial making stage, the rubber material is vulcanized on a flat vulcanizing machine at constant temperature for a certain time to obtain a 2mm physical sheet, a dynamic viscoelasticity test is carried out, and a new development formulation hysteresis factor is tested to estimate the rolling resistance performance of the new formulation on a tire finished product. In addition, in the tire trial process, the rolling resistance coefficient of the tire can be directly tested first to determine the rolling resistance performance reduction amplitude of the new formula. Furthermore, the finished tire can be dissected and sampled for dynamic viscoelasticity test, and the hysteresis factor of the newly developed formula is tested to determine the new formula to evaluate the rolling resistance of the tire.
The defects of the prior art are that in the stage of small matching and large sample trial, the method for testing the dynamic viscoelasticity hysteresis factor of the constant temperature vulcanized physical sheet of the flat vulcanizing machine is not accurate in evaluating the performance of the new formula on the finished tire product. The constant temperature vulcanization by using the flat vulcanizing machine is that the tire is a thick rubber product, and the rubber is a hot bad conductor, so that the tire is not vulcanized at constant temperature but is vulcanized at variable temperature in the actual vulcanization process. The difference of the vulcanization temperature history influences the vulcanization crosslinking reaction and the difference of the aggregation state of the filler, so that the vulcanized rubber prepared by the two vulcanization histories has larger difference in performance.
The test of the rolling resistance coefficient of the tire and the test of the hysteresis factor of the anatomical sample of the finished tire to evaluate the development effect of the new formulation are relatively delayed in the tire test-making stage, if the development effect of the formulation does not meet the expectations in the stage, the small-fit, large-sample test-making and the tire test-making processes are carried out again, the development period of the formulation is longer, the tire test-making process and a series of test processes are involved, and the development cost is higher.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and adopts a tire low rolling resistance formula design test method to solve the problems in the prior art.
A tire low rolling resistance formula design test method comprises the following steps:
obtaining a tire manufacturing material;
repeatedly acquiring vulcanization temperature history data in a tire vulcanization period by a tire vulcanization temperature data acquisition method, wherein the tire vulcanization temperature data acquisition method comprises a thermocouple buried wire temperature measurement test method and an FEA finite element analysis method;
preparing a low rolling resistance formula at different stages according to temperature data in a tire vulcanization period to obtain an optimized tire sizing material formula;
and (3) vulcanizing and testing the tire finished product of the tire test product according to the optimized tire sizing material formula, and analyzing the test result.
As a further aspect of the invention: the thermocouple buried wire temperature measurement test method specifically comprises the following steps:
firstly, embedding a thermocouple at a collection point when a tire blank is formed, wherein the collection point comprises a tread, a sidewall, a tire shoulder, a belt layer endpoint, a tire cavity and a apex;
setting the blank with embedded thermocouple inside vulcanizing machine, connecting recorder, cooling naturally to form one vulcanizing period, cutting off thermocouple, and storing temperature measurement data to complete data acquisition.
As a further aspect of the invention: the FEA finite element analysis method comprises the following specific steps:
firstly, thermodynamic parameters, density and vulcanization characteristics of a tire component rubber material and a steel wire are obtained, wherein the thermodynamic parameters comprise a heat conductivity coefficient, a specific heat capacity and activation energy;
and then establishing an FEA vulcanization simulation model, and calculating the vulcanization temperature history of the component rubber material in the vulcanization period through the model to complete data acquisition.
As a further aspect of the invention: the specific steps of preparing the low rolling resistance formula at different stages according to the temperature data in the tire vulcanization period to obtain the optimized tire sizing material formula comprise:
firstly, selecting, proportioning and screening materials in different systems according to performance requirements, wherein the systems comprise a raw rubber system, a reinforcing filling system, an anti-aging system, an activation system, a vulcanization system, a softening and plasticizing system and an adhesive system;
the weight fraction of the carbon black is reduced by using white carbon black to replace part of the carbon black in the reinforcing filling system or using carbon black with larger particle size; or (b)
In the raw rubber system, part of low-hysteresis synthetic rubber is used together, wherein the synthetic rubber is cis-butadiene rubber or solution polymerized styrene-butadiene rubber.
As a further aspect of the invention: the specific steps of vulcanization and testing include:
firstly, inputting or fitting the acquired vulcanization temperature history data into a rubber processing instrument;
vulcanizing operation is carried out by taking vulcanization temperature history data as vulcanization conditions;
secondly, setting a test program, reducing the temperature in a test cavity to 60 ℃ and maintaining the temperature, and testing under the double strain amplitude with the frequency of 10Hz and 5+/-0.1%;
and (3) obtaining a sizing material cutting sample prepared at different stages, placing the sizing material cutting sample in a test cavity for vulcanization and testing, obtaining an output hysteresis factor, an elastic modulus, a viscous modulus and loss compliance, and evaluating according to a test result.
As a further aspect of the invention: in the dynamic deformation process, the strain is determinedDuring dynamic deformation, the person is added with->And viscous modulus->Proportional to the ratio;
when stress is fixedDuring dynamic deformation, the person is added with->Compliance with loss->Proportional to the ratio;
when energy is suppliedDuring dynamic deformation, the person is added with->And hysteresis factor->Proportional to the ratio;
wherein,loss compliance for energy loss or dynamic hysteresis>，/>Is the elastic modulus.
Compared with the prior art, the invention has the following technical effects:
by adopting the technical scheme, the vulcanization temperature history of a certain part or a plurality of parts of the tire is repeatedly obtained for a plurality of times by adopting a thermocouple buried wire temperature measurement test or an FEA finite element analysis method, and is input or fitted into a function to be input into a rubber processing instrument. And then, the tire formula design is carried out, the setting of vulcanization conditions and dynamic viscoelasticity test are carried out according to a rubber processing instrument input with the vulcanization temperature process, and hysteresis factors, elastic modulus, viscous modulus and loss compliance are output. And finally, performing performance evaluation to determine whether the formula design meets the design target. Thereby solving the problems of the prior formula design, such as larger difference of vulcanized rubber performance due to the difference of vulcanization temperature history, and the like. Shortens the development period of the formula design and reduces the development cost of the formula.
Drawings
The following detailed description of specific embodiments of the invention refers to the accompanying drawings, in which:
FIG. 1 is a schematic illustration of steps of a tire low rolling resistance formulation testing method according to some embodiments of the present disclosure;
FIG. 2 is a flow chart of a tire low rolling resistance formulation testing method according to some embodiments of the present disclosure;
FIG. 3 is a schematic diagram of thermocouple junction temperature measurement test mode collection tire tread vulcanization temperature history according to some embodiments disclosed herein;
FIG. 4 is a schematic diagram of a fitted curve and a fitted equation of the temperature rise history of vulcanization 0-1.7min according to some embodiments of the present disclosure;
FIG. 5 is a schematic diagram of a fitted curve and a fitted equation for a temperature rise history of vulcanization of 1.7-45.0min according to some embodiments of the present disclosure;
FIG. 6 is a schematic diagram of a fitted curve and a fitted equation for a temperature rise history of vulcanization of 45.0-90.0min in some embodiments disclosed herein.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 and 2, in an embodiment of the present invention, a method for testing a low rolling resistance tire formula design includes the following specific steps:
s1, obtaining tire manufacturing materials, wherein the tire manufacturing materials specifically comprise manufacturing materials required in different stages of tire formula development small fit, large sample trial production, tire trial production and the like;
s2, repeatedly acquiring vulcanization temperature history data in a tire vulcanization period by a tire vulcanization temperature data acquisition method, wherein the tire vulcanization temperature data acquisition method comprises a thermocouple buried wire temperature measurement test method and an FEA finite element analysis method;
in a specific embodiment, the thermocouple buried wire temperature measurement test method specifically comprises the following steps:
firstly, embedding a thermocouple at a collection point when a tire blank is formed, wherein the collection point comprises a tread, a sidewall, a tire shoulder, a belt layer endpoint, a tire cavity and a apex;
and arranging the blank embedded with the thermocouple in a vulcanizing machine, switching on a recorder, starting timing from the mold closing time, unloading the tire after one period of tire vulcanization, naturally cooling the tire in an unloading frame for one vulcanization period, switching off the thermocouple, and storing temperature measurement data to finish data collection.
In a specific embodiment, the FEA finite element analysis method comprises the following specific steps:
firstly, thermodynamic parameters, density and vulcanization characteristics of a tire component rubber material and a steel wire are obtained, wherein the thermodynamic parameters comprise a heat conductivity coefficient, a specific heat capacity and activation energy;
and then establishing an FEA vulcanization simulation model, and calculating the vulcanization temperature history of the component rubber material in the vulcanization period through the model to complete data acquisition.
S3, preparing a low rolling resistance formula at different stages according to temperature data in a tire vulcanization period to obtain an optimized tire sizing material formula, wherein the specific steps comprise:
firstly, selecting, proportioning and screening materials in different systems according to performance requirements, wherein the systems comprise a raw rubber system, a reinforcing filling system, an anti-aging system, an activation system, a vulcanization system, a softening and plasticizing system and an adhesive system, and part of special performance requirement formulas also comprise a flame retardant system and the like;
the weight fraction of the carbon black is reduced by using white carbon black to replace part of the carbon black in the reinforcing filling system or using carbon black with larger particle size; or (b)
In the raw rubber system, part of low-hysteresis synthetic rubber is used together, wherein the synthetic rubber is cis-butadiene rubber or solution polymerized styrene-butadiene rubber.
Or strengthen the formula vulcanization system, promote the crosslinking density, etc.
Specifically, the tire formulation process can generally have the following 3 stages, small fit, large sample trial and tire trial. Wherein the formulation design is mainly performed according to the tire performance requirement in the small matching stage. The formulation is subject to other properties besides hysteresis properties, such as "devil's triangle" (abrasion, rolling resistance, wet grip) in tire formulations, which is a balancing process with performance emphasis. For small matches, the preferred formulation requires a series of tests to evaluate performance, including but not limited to tensile, tear, high temperature, aged, abrasion, fatigue, etc. test items.
S4, vulcanizing and testing the tire finished product of the tire test product according to the optimized tire sizing material formula, and analyzing the test result.
Firstly, after performance evaluation, the dynamic viscoelasticity of the new formula is required to be tested, and the influence condition of the dynamic viscoelasticity on the rolling resistance performance of the tire is estimated.
The specific steps of vulcanization and testing include:
firstly, inputting or fitting the acquired vulcanization temperature history data into a rubber processing instrument;
vulcanizing operation is carried out by taking vulcanization temperature history data as vulcanization conditions;
secondly, setting a test program, reducing the temperature in a test cavity to 60 ℃ and maintaining the temperature, and testing under the double strain amplitude with the frequency of 10Hz and 5+/-0.1%;
and (3) obtaining a sizing material cutting sample prepared at different stages, placing the sizing material cutting sample in a test cavity for vulcanization and testing, obtaining an output hysteresis factor, an elastic modulus, a viscous modulus and loss compliance, and evaluating according to a test result.
In the specific embodiment, during the dynamic deformation process, the strain is determinedDuring dynamic deformation, the person is added with->And viscous modulus->Proportional to the ratio;
when stress is fixedDuring dynamic deformation, the person is added with->Compliance with loss->Proportional to the ratio;
when energy is suppliedDuring dynamic deformation, the person is added with->And hysteresis factor->Proportional to the ratio;
wherein,loss compliance for energy loss or dynamic hysteresis>，/>Is the elastic modulus.
S5, testing the rolling resistance coefficient of the finished tire and testing the anatomical sampling dynamic viscoelasticity of the finished tire
Specifically, the optimal scheme of the formula design in the step S3 is subjected to mass sample trial production, and after the mass sample performance of the workshop is confirmed by the method introduced in the step S4, the tire trial production is performed. After the tire is vulcanized, the rolling resistance coefficient of the tire finished product is tested;
the specific test method refers to the single-point test and the correlation of the measurement result of the GB/T29040-2012 automobile tire rolling resistance test method, meanwhile, the anatomical sampling of the tire finished product is carried out to carry out the dynamic viscoelasticity test of the sizing material, and the dynamic viscoelasticity result of the finished product is confirmed.
And the actual effect of the formula on the finished product is confirmed through the rolling resistance coefficient test of the finished product of the tire. The finished tire anatomical sampling test confirms the actual contribution of rolling resistance of the developed component.
Examples:
example 1:
as shown in fig. 3, first, the tire-vulcanized tread part vulcanization temperature history is collected according to step S1;
as shown in fig. 4, 5 and 6, in order to more accurately and conveniently input the tire tread vulcanization temperature history data into the rubber processing analyzer, the temperature rise curve of fig. 1 is fitted into the following three curves and a corresponding fitting equation is obtained.
The compound of the formula in example 1 was vulcanized and tested by the test method of the invention to confirm the dynamic viscoelasticity of the compound as shown in the following table:
according to the test result, the preferable formula 1 with lower rolling resistance coefficient can be selected for tire trial production.
Comparative example 2:
in order to develop an all-steel radial tire with the tire rolling resistance coefficient lower than 4.0, according to the prior experience, the influence proportion of the tire crown to the tire finished product rolling resistance coefficient is maximum and reaches more than 40 percent, so that an all-new low-rolling-resistance tread formula needs to be developed.
According to the prior art formulation development method, a minor compounding test is performed to confirm the preferred protocol. The test results of the preferred scheme are confirmed by a plurality of rounds of small matching tests and the current test method in the prior art as follows:
the loss compliance was comparable as a result of the dynamic viscoelasticity test of preference 1 and preference 2. For this, large sample trial production and tire trial production are generally required, and the scheme is optimized continuously by testing the rolling resistance coefficient of the tire finished product or the viscoelasticity test result of the tread rubber compound by the anatomical sampling test of the tire finished product.
Comparative example 3:
in order to actually verify the reliability of the test method, the preferred formula 1 and the preferred formula 2 are subjected to tire trial production, the finished product rolling resistance coefficient and the dynamic viscoelasticity of the tire finished product anatomical sampling tread rubber are tested, and the test results are summarized in the following table:
according to the test result, the preferable formula 1 is finally selected for limited production, namely mass production. The feasibility and accuracy of the tire low rolling resistance formula design and test method introduced by the invention should be also characterized.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (4)
1. The method for testing the low rolling resistance formula design of the tire is characterized by comprising the following steps of:
obtaining a tire manufacturing material;
repeatedly acquiring vulcanization temperature history data in a tire vulcanization period by a tire vulcanization temperature data acquisition method, wherein the tire vulcanization temperature data acquisition method comprises a thermocouple buried wire temperature measurement test method and an FEA finite element analysis method;
preparing a low rolling resistance formula at different stages according to temperature data in a tire vulcanization period to obtain an optimized tire sizing material formula;
performing tire product vulcanization and test on the tire test product according to the optimized tire sizing material formula, and analyzing the test result;
wherein the specific steps of vulcanization and testing include:
firstly, inputting or fitting the acquired vulcanization temperature history data into a rubber processing instrument;
vulcanizing operation is carried out by taking vulcanization temperature history data as vulcanization conditions;
secondly, setting a test program, reducing the temperature in a test cavity to 60 ℃ and maintaining the temperature, and testing under the double strain amplitude with the frequency of 10Hz and 5+/-0.1%;
obtaining a sizing material cutting sample prepared at different stages, placing the sizing material cutting sample in a test cavity for vulcanization and testing to obtain an output hysteresis factor, an elastic modulus, a viscous modulus and loss compliance, and evaluating according to a test result;
in the dynamic deformation process, the strain is determinedDuring dynamic deformation, the person is added with->And viscous modulus->Proportional to the ratio;
when stress is fixedDuring dynamic deformation, the person is added with->Compliance with loss->Proportional to the ratio;
when energy is suppliedDuring dynamic deformation, the person is added with->And hysteresis factor->Proportional to the ratio;
wherein,loss compliance for energy loss or dynamic hysteresis>，/>Is the elastic modulus.
2. The method for testing the low rolling resistance formula design of the tire according to claim 1, wherein the specific steps of the thermocouple buried wire temperature measurement test method comprise:
firstly, embedding a thermocouple at a collection point when a tire blank is formed, wherein the collection point comprises a tread, a sidewall, a tire shoulder, a belt layer endpoint, a tire cavity and a apex;
setting the blank with embedded thermocouple inside vulcanizing machine, connecting recorder, cooling naturally to form one vulcanizing period, cutting off thermocouple, and storing temperature measurement data to complete data acquisition.
3. The method for testing the low rolling resistance formula design of the tire according to claim 1, wherein the specific steps of the FEA finite element analysis method comprise:
firstly, thermodynamic parameters, density and vulcanization characteristics of a tire component rubber material and a steel wire are obtained, wherein the thermodynamic parameters comprise a heat conductivity coefficient, a specific heat capacity and activation energy;
and then establishing an FEA vulcanization simulation model, and calculating the vulcanization temperature history of the component rubber material in the vulcanization period through the model to complete data acquisition.
4. The method for testing the low rolling resistance formula design of the tire according to claim 1, wherein the specific steps of preparing the low rolling resistance formula at different stages according to temperature data in a tire vulcanization period to obtain the optimized tire compound formula comprise the following steps:
firstly, selecting, proportioning and screening materials in different systems according to performance requirements, wherein the systems comprise a raw rubber system, a reinforcing filling system, an anti-aging system, an activation system, a vulcanization system, a softening and plasticizing system and an adhesive system;
the weight fraction of the carbon black is reduced by using white carbon black to replace part of the carbon black in the reinforcing filling system or using carbon black with larger particle size; or (b)
In the raw rubber system, part of low-hysteresis synthetic rubber is used together, wherein the synthetic rubber is cis-butadiene rubber or solution polymerized styrene-butadiene rubber.
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