CN116698903A - Method for analyzing most difficult vulcanization point of thick rubber product - Google Patents
Method for analyzing most difficult vulcanization point of thick rubber product Download PDFInfo
- Publication number
- CN116698903A CN116698903A CN202310842142.1A CN202310842142A CN116698903A CN 116698903 A CN116698903 A CN 116698903A CN 202310842142 A CN202310842142 A CN 202310842142A CN 116698903 A CN116698903 A CN 116698903A
- Authority
- CN
- China
- Prior art keywords
- dimensional model
- entity
- thermal analysis
- time
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004073 vulcanization Methods 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 51
- 239000000463 material Substances 0.000 claims abstract description 64
- 238000002076 thermal analysis method Methods 0.000 claims abstract description 62
- 238000004088 simulation Methods 0.000 claims abstract description 43
- 238000004364 calculation method Methods 0.000 claims abstract description 40
- 230000001052 transient effect Effects 0.000 claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 claims abstract description 30
- 230000008569 process Effects 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims description 41
- 230000004913 activation Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 abstract description 4
- 230000008859 change Effects 0.000 description 7
- 230000006870 function Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000005070 sampling Methods 0.000 description 4
- 230000001788 irregular Effects 0.000 description 3
- 238000010079 rubber tapping Methods 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009434 installation 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
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
-
- 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
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
- G01N25/12—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering of critical point; of other phase change
-
- 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
- G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity
-
- 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
Abstract
The invention provides a method for analyzing the most difficult vulcanization point of a thick rubber product, which comprises the steps of firstly measuring the sizes of the thick rubber product, a mould and the like, drawing a three-dimensional model combination entity, introducing the three-dimensional model combination entity into thermal analysis software, confirming the material properties of each part of the thick rubber product, inquiring the corresponding heat conductivity information of the thick rubber product, giving the corresponding heat conductivity information to the corresponding division part, carrying out grid division on the three-dimensional model combination entity, setting parameters, then running thermal analysis software, sequentially carrying out steady-state thermal analysis simulation and transient thermal analysis simulation, and finally obtaining the most difficult vulcanization point position of the thick rubber product through the simulation time-three-dimensional temperature cloud picture obtained through analysis. According to the invention, the thermal analysis software is utilized to simulate the actual production process of the thick rubber product, so that the cost is low, the simulated operation process is simple, the running time is short, and the most difficult vulcanization point of the thick rubber product can be rapidly analyzed through the simulated calculation result.
Description
Technical Field
The invention relates to the technical field of rubber product production, in particular to a method for analyzing the most difficult vulcanization point of a thick rubber product.
Background
In mining equipment, the wear-resistant rubber is used as equipment material, so that the wear resistance of the equipment can be improved, and the service life of the equipment can be prolonged. Since mining equipment is generally large-scale equipment, the rubber spare parts are generally thick in structure and irregular in shape, part of the products also have metal frameworks, and the vulcanization time of the products is difficult to estimate during production. When the vulcanization time is estimated empirically, in order to avoid the loss caused by failure due to incomplete vulcanization of the thick rubber product, more time is usually reserved to ensure complete vulcanization of the inside of the thick rubber product. This also results in an excessively long reserved vulcanization time and a lower production efficiency when producing thick rubber products of new structure. In addition, the vulcanization equipment, the environment, the structural design of the mold and the like have influence on the actual vulcanization temperature, which leads to uneven quality of the same thick rubber product in the same vulcanization time. The vulcanization pressure to which the thick rubber product is subjected during vulcanization is not greatly fluctuated, but the temperature distribution inside thereof is uneven because the rubber is a poor conductor of heat. Therefore, the most difficult vulcanization point of the thick rubber product is obtained, and the equivalent vulcanization time is determined by measuring the temperature of the thick rubber product in real time, so that the vulcanization time is flexibly adjusted, the production efficiency of the thick rubber product can be improved on the premise of ensuring the vulcanization quality of the thick rubber product, the utilization rate of equipment is improved, the production cost is reduced, the energy is saved, and the overall benefit of enterprises is increased.
In the prior art, the position of the lowest temperature point, namely the most difficult vulcanization point, in the thick rubber product is determined, and the simplest method is a bubble point method. However, the bubble point method is costly and difficult to perform even with a metal skeleton due to the wide variety of thick rubber products and the varying shapes. Therefore, there is a need for a method that is relatively inexpensive and that can quickly determine the most difficult cure point of a thick rubber article, from which the equivalent cure time can be quickly calculated.
Disclosure of Invention
The invention aims to provide a method for analyzing the most difficult vulcanization point of a thick rubber product, which solves the technical problems of high cost and difficult execution of a bubble method in the prior art, realizes the technical effects of low cost and easy execution, and can rapidly determine the most difficult vulcanization point of the thick rubber product.
In order to achieve the above purpose, the present invention proposes the following technical scheme:
a method of analyzing the most difficult cure point of a thick rubber article comprising the steps of:
step one: measuring the actual size of a thick rubber product to obtain the actual size of the thick rubber product, wherein the thick rubber product comprises a rubber part and a metal framework, and the metal framework is internally arranged in the rubber part;
Measuring the actual sizes of a die, an insert and a positioning pin which are matched with the die to obtain the actual sizes of the die, the insert and the positioning pin;
wherein, the mould is a forming mould matched with the thick rubber product in actual production;
step two: according to the actual size of the thick rubber product, the thick rubber product of the thick rubber product is a three-dimensional model entity;
drawing a mould three-dimensional model entity of the mould according to the actual size of the mould;
drawing an insert three-dimensional model entity of the insert according to the actual size of the insert;
drawing a locating pin three-dimensional model entity of the locating pin according to the actual size of the locating pin;
matching and combining the rubber thick product three-dimensional model entity, the mold three-dimensional model entity, the insert three-dimensional model entity and the locating pin three-dimensional model entity together to obtain a three-dimensional model combined entity;
step three: the three-dimensional model combined entity is led into thermal analysis software, then the three-dimensional model combined entity is divided into a plurality of parts according to different material properties and named respectively, and after the material properties are divided, each part of the three-dimensional model combined entity after the material properties are divided is added with a label corresponding to the material properties;
Step four: according to the material attribute of each part of the three-dimensional model combined entity after the material attribute division is completed, recording the heat conductivity information of the corresponding material, and giving the heat conductivity information to each part of the three-dimensional model combined entity with the corresponding label after the material attribute division is completed;
step five: in the thermal analysis software, setting the surface-to-surface contact between every two parts in the three-dimensional model combined entity after finishing material attribute division as "bonded", and adjusting the "Pinball Region" as "Auto Detection Value" so as to enable the thermal analysis software to automatically adjust the value of the "Pinball Region", thereby ensuring that the value of the "Pinball Region" is smaller than the size of a unit grid set in the later step under any condition; or, manually adjusting the value of the Pinball Region to adapt to the size of the unit grid set in the later step;
step six: performing grid division on each part of the three-dimensional model combined entity after material attribute division by using a grid division function of the thermal analysis software;
step seven: importing the three-dimensional model combined entity after grid division into a steady-state thermal analysis module of the thermal analysis software, applying constant thermal load to each corresponding part of the three-dimensional model combined entity after grid division according to the temperature conditions of the rubber part, the metal framework, the die, the insert and the locating pin before the actual production of the thick rubber product, and acting on the three-dimensional model combined entity after the whole grid division, and simultaneously, running steady-state thermal analysis calculation to obtain a steady-state thermal analysis calculation result;
Step eight: importing the three-dimensional model combined entity after grid division and the steady-state thermal analysis calculation result into a transient thermal analysis module of the thermal analysis software, and taking the steady-state thermal analysis calculation result as an initial temperature setting condition of transient thermal analysis;
step nine: in the transient thermal analysis module, applying constant thermal load to the upper surface of the upper die cover and the lower surface of the lower die cover of the three-dimensional model combined entity after grid division, and setting the temperature of the upper die cover and the lower surface as the process temperature set by a vulcanizing machine during actual production of the thick rubber product;
applying heat convection load to other surfaces of the three-dimensional model combined entity after grid division, setting an air temperature value, a heat exchange coefficient and transient thermal analysis simulation running time, and defining a set time node as time;
setting the automatic time step as 'no', and setting a time step value according to the requirement;
setting the time integral to be 'on';
after the setting is finished, the transient thermal analysis module of the thermal analysis software is operated to start solving;
after the solving is completed, obtaining a transient thermal analysis calculation result;
step ten: taking a plurality of time nodes of the transient thermal analysis simulation running time, and drawing a simulation time-three-dimensional temperature cloud picture for the rubber part of the thick rubber product;
And adjusting the time axis of the simulation time-three-dimensional temperature cloud chart to a time node corresponding to the determined process time when the rubber thick product is actually produced, obtaining a three-dimensional temperature cloud chart of the rubber part of the rubber thick product, using an equivalent surface view, adjusting a temperature scale, determining the position of the lowest point of the rubber temperature, carrying out view sectioning on the position of the lowest point of the rubber temperature, modifying the temperature display precision of the temperature scale to be 0.1 ℃, and enabling accurate temperature valleys to appear in the equivalent surface view, wherein the temperature valleys are the most difficult vulcanization points of the rubber part.
As a preferable technical scheme of the invention, the three-dimensional model entity of the rubber thick product, the three-dimensional model entity of the mould, the three-dimensional model entity of the insert and the three-dimensional model entity of the locating pin in the second step are CAD three-dimensional model entities.
In the third step, the three-dimensional model assembly entity is imported into thermal analysis software, and then the three-dimensional model assembly entity is divided into a plurality of parts according to different material properties and named respectively, including:
the three-dimensional model combined entity is imported into thermal analysis software, and then the three-dimensional model combined entity is divided into 4 parts according to different material properties and named respectively, specifically:
For the upper die cover, lower die cover and outer rim of the die, named "outidemould";
for the insert and the locating pin, named "insert mound";
for the rubber parts of the thick rubber product, the parts are further divided according to different rubber types and respectively named as corresponding rubber marks and rubber;
for the metal framework, the metal framework is further divided according to the difference of materials of the metal framework, and the metal framework is named as corresponding metal framework material+skeleton;
after the material attribute is divided, adding a label corresponding to the material attribute on each part of the three-dimensional model combination entity after the material attribute is divided.
In the fifth step, the unit mesh is set to be sized such that the upper cover, the lower cover, and the outer frame of the mold are larger than the insert and the positioning pin, and the rubber portion of the thick rubber product is larger than the metal skeleton.
In the sixth step, the meshing function of the thermal analysis software performs meshing on each part of the three-dimensional model assembly entity after finishing the material attribute meshing, and the method includes:
For the upper die cover, the lower die cover and the outer frame of the die, a Hex domino grid dividing mode is used, an Element Order is set as linear, if generation of the Hex domino grid fails, the three-dimensional model combination entity is readjusted, the three-dimensional model combination entity is split or combined to form a regular convex body, and a split part is connected with a part by using a bond;
for the insert and the locating pin, an Automatic grid division mode is used, and an Element Order is set to be a quadric so as to reduce calculation errors;
for the rubber part of the thick rubber product, whether or not it is regular, forcing its meshing mode to Tetrahedrons, setting its "Element Order" to "quadric";
for the metal skeleton, the Element Order was set to "quadric" using tetrahedron meshing.
In a preferred embodiment of the present invention, in the step nine, the air temperature set point is 30 ℃.
As a preferable technical scheme of the invention, in the step nine, the heat exchange coefficient is set to be 0.0000015w/mm 2 ·℃。
In a preferred embodiment of the present invention, in the step nine, the transient thermal analysis simulation run time is set to 1800s more than the process time when the thick rubber product is actually produced, or 3600s more than the estimated vulcanization time.
In the step nine, for the process time determined when the thick rubber product is actually produced, and only the position of the most difficult vulcanization point is required to be solved, setting the time step value to be 180 s-300 s;
in the case where the vulcanization time needs to be solved, the time step is set to 60s.
As a preferred technical solution of the present invention, in the case of solving the vulcanization time, the method further includes a step eleven:
deriving a temperature data table of the lowest temperature point of the rubber part of the thick rubber product from the transient thermal analysis calculation result, removing all items below 90 ℃ in the data table, placing all the remaining items in the data table into a spreadsheet for operation, wherein the formula is used
In the above, T s For the accumulated equivalent vulcanization time, x is the corresponding item number, deltat is the set time step, E is the activation energy of the rubber material, R is the gas constant, T n T is the temperature at the nth item n-1 For the temperature of the preceding item of item n, T 0 The corresponding temperature of the equivalent vulcanization time is calculated;
and calculating the corresponding accumulated equivalent vulcanization time, and when the accumulated equivalent vulcanization time reaches the set demolding equivalent vulcanization time when the thick rubber product is actually produced, obtaining the corresponding time as the estimated vulcanization time.
According to the method for analyzing the most difficult vulcanization point of the thick rubber product, firstly, a three-dimensional model combination entity which is matched and combined with a mold and the like is drawn, the three-dimensional model combination entity is used for replacing a combination entity which is matched and combined with the thick rubber product and the mold in actual production, then the three-dimensional model combination entity is led into thermal analysis software, material attribute division, grid division and the like are carried out on the three-dimensional model combination entity by using the thermal analysis software, then corresponding parameters are respectively set in the thermal analysis software according to each parameter setting when the thick rubber product is actually produced, so that the vulcanization process in the simulation is close to the vulcanization process in actual production, the obtained calculation result is ensured to be similar to the result in the actual production process, the accuracy is high, and finally, the position of the highest temperature point and the position of the lowest temperature point of the thick rubber product can be qualitatively and rapidly analyzed by analyzing the rule that the vulcanization temperature of each part of the thick rubber product in the whole simulation process is changed along with time.
Therefore, by utilizing the simulated thermal analysis software, the three-dimensional model entity of the thick rubber product is set according to parameters in actual production, and simulated simulation is carried out according to the actual production process of the thick rubber product.
It should be understood that all combinations of the foregoing concepts, as well as additional concepts described in more detail below, may be considered a part of the inventive subject matter of the present disclosure as long as such concepts are not mutually inconsistent.
The foregoing and other aspects, embodiments, and features of the present teachings will be more fully understood from the following description, taken together with the accompanying drawings. Other additional aspects of the invention, such as features and/or advantages of the exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the embodiments according to the teachings of the invention.
Drawings
The drawings are not intended to be drawn to scale with respect to true references. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a perspective view of a simulated time-three-dimensional temperature cloud image of a thick rubber article of example 1 of the present invention;
FIG. 2 is a cross-sectional view of a simulated time-three-dimensional temperature cloud image of a thick rubber article of example 1 of the present invention;
FIG. 3 is a longitudinal cross-sectional view of a simulated time-three-dimensional temperature cloud image of a thick rubber article of example 1 of the present invention;
FIG. 4 is a schematic diagram showing the comparison of the locations of simulated and empirical holes of the thick rubber article of example 1 of the present invention;
FIG. 5 is a graph showing the comparison of the temperature change of a simulated hole and an empirical hole of a thick rubber product of example 1 of the present invention at the time of actual production;
FIG. 6 is a graph showing the variation of the highest temperature point and the lowest temperature point of the thick rubber article of example 2 of the present invention;
FIG. 7 is a graph showing the cumulative equivalent cure time for the thick rubber article of example 2 of the present invention;
FIG. 8 is a simulated time-three-dimensional temperature cloud image of a thick rubber article of example 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Also, unless the context clearly indicates otherwise, singular forms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "comprises," "comprising," or the like are intended to cover a feature, integer, step, operation, element, and/or component recited as being present in the element or article that "comprises" or "comprising" does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. "up", "down", "left", "right" and the like are used only to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed accordingly.
A method of analyzing the most difficult cure point of a thick rubber article comprising the steps of:
step one: measuring the actual size of the thick rubber product to obtain the actual size of the thick rubber product, wherein the thick rubber product comprises a rubber part and a metal framework, and the metal framework is internally arranged in the rubber part, so that the actual size of the thick rubber product actually comprises the actual size of the rubber part and the actual size of the metal framework;
Measuring the actual sizes of the die, the insert and the positioning pin matched with the die to obtain the actual sizes of the die, the insert and the positioning pin;
the mold is a forming mold matched with the thick rubber product in actual production.
Step two: drawing a rubber thick product three-dimensional model entity of the rubber thick product according to the actual size of the rubber thick product, wherein the rubber thick product three-dimensional model entity comprises a three-dimensional model entity of a rubber part and a three-dimensional model entity of a metal framework, and the metal framework is embedded in the rubber part, so that the three-dimensional model entity of the metal framework is also embedded in the three-dimensional model entity of the rubber part in the rubber thick product three-dimensional model entity;
drawing a three-dimensional model entity of the mould according to the actual size of the mould;
drawing an insert three-dimensional model entity of the insert according to the actual size of the insert;
drawing a locating pin three-dimensional model entity of the locating pin according to the actual size of the locating pin;
the three-dimensional model entity of the rubber thick product, the three-dimensional model entity of the mould, the three-dimensional model entity of the insert and the three-dimensional model entity of the locating pin are matched and combined together to obtain a three-dimensional model combined entity, and specifically, the three-dimensional model entity is combined according to the installation and combination mode of the rubber thick product, the mould, the insert and the locating pin when the rubber thick product is actually produced, so that the three-dimensional model combined entity is similar to the combined entity, and the accuracy of a calculation result is ensured to be high;
In addition, when the drawing is carried out, the obtained three-dimensional model entity of the rubber thick product, the three-dimensional model entity of the mould and the like are ensured to be consistent with corresponding real objects, so that the three-dimensional model combination entity for calculation is ensured to be consistent with the real objects, and the accuracy of results obtained by adopting thermal analysis software to simulate and analyze is ensured to be high.
Furthermore, CAD drawing software is adopted for drawing the three-dimensional model entity, so that the three-dimensional model entity of the rubber thick product, the three-dimensional model entity of the mold, the three-dimensional model entity of the insert and the three-dimensional model entity of the locating pin in the second step are all CAD three-dimensional model entities.
Step three: and (3) importing the three-dimensional model combined entity into thermal analysis software, dividing the three-dimensional model combined entity into a plurality of parts according to different material properties and naming the parts respectively, and adding a label corresponding to the material properties of each part of the three-dimensional model combined entity after the material properties are divided so as to facilitate the follow-up parameter setting and the follow-up calculation result derivation or calling.
Further, in the third step, the three-dimensional model assembly entity is imported into thermal analysis software, and then the three-dimensional model assembly entity is divided into a plurality of parts according to different material properties and named respectively, including:
The three-dimensional model combined entity is led into thermal analysis software, and is divided into 4 parts according to different material properties and named respectively, specifically:
for the upper die cover, lower die cover and outer rim of the die, named "outidemould";
for the insert and the locating pin, named "insert mound";
the rubber parts of the thick rubber products are further divided according to different rubber types and are respectively named as corresponding rubber marks and rubber;
for the metal framework, the metal framework is further divided according to the difference of materials of the metal framework, and the metal framework is named as corresponding metal framework material+skeleton;
after the material attribute is divided, adding a label corresponding to the material attribute on each part of the three-dimensional model combination entity after the material attribute is divided.
Step four: according to the material property of each part of the three-dimensional model combination entity after the material property division is completed, the thermal conductivity information of the corresponding material, such as the thermal conductivity information of the rubber part of the thick rubber product, the thermal conductivity information of the metal framework, the thermal conductivity information of the mold and the like, is input, and the thermal conductivity information is endowed to each part of the three-dimensional model combination entity with the corresponding label after the material property division is completed.
Step five: because in actual measurement, gaps among all the component structures of the die cannot be completely and accurately measured, in order to reduce calculation failure caused by errors of a three-dimensional model combined entity and a combined entity, in thermal analysis software, setting the surface-to-surface contact between every two parts in the three-dimensional model combined entity as "bonded", and adjusting the "Pinball Region" as "Auto Detection Value", so that the thermal analysis software automatically adjusts the value of the "Pinball Region", and the value of the "Pinball Region" is ensured to be smaller than the size of a unit grid set in the later step under any condition; alternatively, the value of "Pinball Region" is manually adjusted to accommodate the size of the unit cell set in the next step.
Step six: and performing grid division on each part of the three-dimensional model combination entity after the material attribute division by using a grid division function of thermal analysis software.
Further, in order to adapt to the thermal analysis calculation result of the thermal analysis software, in the sixth step, the mesh division function of the thermal analysis software is used to perform mesh division on each part of the three-dimensional model assembly entity after the material attribute division is completed, and the method includes:
For the upper die cover, the lower die cover and the outer frame of the die, a Hex domino grid dividing mode is used, an Element Order is set as linear, so that thermal analysis calculation is stable, the consumed memory is small, if Hex domino grid generation fails, the three-dimensional model combination entity is readjusted, namely the three-dimensional model combination entity is split or combined to form a regular convex body, and the split parts are connected by using bonding;
for other parts such as the insert and the locating pin, an Automatic grid division mode is used, and the 'element order' of the part is set as 'quadric' due to the fact that the structure of the part is complex, so that calculation errors are reduced;
for the rubber part of the thick rubber product, whether the thick rubber product is regular or not, forcing the grid division mode to be Tetrahedrons, and setting the 'element order' to be 'quadric'; because the grid division cannot be infinitely small and the internal structure of the rubber part is irregular, an irregular grid division mode is adopted, and the most difficult vulcanization point of the thick rubber product can be confirmed by adopting the mode of taking the geometric center of an isothermal line and the like in the final analysis;
for the metal framework, a tetrahedron grid division mode is used in the same way, and the Element Order is set to be quadric for reducing the overall calculation error.
Further, the unit mesh is set to be the upper die cover, the lower die cover and the outer frame of the die, the insert and the locating pin are more than the rubber part of the thick rubber product=the metal skeleton, namely, the thick rubber product is subjected to superfine mesh division, and other parts (such as the die) can be subjected to rough mesh division; emphasis is placed on the thick rubber article itself to save the computational effort and reduce the computational errors of the thermal analysis software while reducing the difficulty of analysis.
The initial temperatures of the respective portions may be set at the time of setting the material parameters, but in most cases, even the same material is not the same at different positions. Therefore, in the embodiment of the application, the three-dimensional model combined entity is firstly led into a steady-state thermal analysis module of thermal analysis software, and a constant thermal load is applied to each corresponding part in the three-dimensional model combined entity according to the temperature condition of each part before the actual production of the thick rubber product, so as to act on the whole three-dimensional model combined entity. Specifically, the method is as in step seven.
Step seven: and importing the three-dimensional model combined entity after grid division into a steady-state thermal analysis module of thermal analysis software, applying constant thermal load to each part of the three-dimensional model combined entity after grid division according to the temperature conditions of the rubber part, the metal framework, the die, the insert and the locating pin before actual production of the thick rubber product, and applying the constant thermal load to the three-dimensional model combined entity after grid division to the whole three-dimensional model combined entity after grid division, and meanwhile, running steady-state thermal analysis calculation to obtain a steady-state thermal analysis calculation result. Under the condition that all parts of the three-dimensional model combined entity are forced to apply constant heat load, running steady-state thermal analysis calculation, wherein the obtained steady-state thermal analysis calculation result is necessarily that the temperatures of all the divided parts inside the three-dimensional model combined entity correspond to the heat load temperatures set by all the parts of the combined entity, so that the temperature can be used as the initial temperature conditions of all the parts in the transient thermal analysis module.
Step eight: and importing the three-dimensional model combined entity after grid division and the steady-state thermal analysis calculation result into a transient thermal analysis module of thermal analysis software, and taking the steady-state thermal analysis calculation result as an initial temperature setting condition of transient thermal analysis. The initial temperature herein includes an initial temperature of a rubber portion of a rubber thick article, an initial temperature of a metal skeleton, an initial temperature of a mold, and the like.
Step nine: the vulcanizing machine heats the upper surface of the upper die cover and the lower surface of the lower die cover of the die when the rubber thick product is actually produced, so that in the transient thermal analysis module, constant thermal load is applied to the upper surface of the upper die cover and the lower surface of the lower die cover of the three-dimensional model combined entity after grid division, and the temperature of the upper surface of the upper die cover and the lower surface of the lower die cover is set as the process temperature set by the vulcanizing machine when the rubber thick product is actually produced;
applying heat convection load to other surfaces (namely, the upper surface of the upper die cover and the lower surface of the lower die cover) of the three-dimensional model combined entity after grid division, setting an air temperature value, a heat exchange coefficient and transient thermal analysis simulation running time, and defining a time node as time;
Setting the automatic time step as 'no', and setting a time step value according to the requirement;
setting the time integral to be 'on';
after the setting is finished, a transient thermal analysis module of thermal analysis software is operated to start solving;
and after the solving is completed, obtaining a transient thermal analysis calculation result.
Specifically, the air temperature value is set to 30 ℃;
the heat exchange coefficient is set to 0.0000015w/mm 2 ·℃；
The transient thermal analysis simulation run time is set to 1800s more than the process time when the thick rubber product is actually produced, or 3600s more than the approximate estimated vulcanization time;
the process time of the actual production of the thick rubber product is determined, and only the position of the most difficult vulcanization point is required to be solved, and the time step value is set to be 180 s-300 s;
in the case where the vulcanization time needs to be solved, the time step is set to 60s.
Step ten: taking a plurality of time nodes of transient thermal analysis simulation running time, and drawing a simulation time-three-dimensional temperature cloud picture for a rubber part of the thick rubber product;
and adjusting the time axis of the simulation time-three-dimensional temperature cloud chart to the vicinity of a time node corresponding to the determined process time when the rubber thick product is actually produced, obtaining a three-dimensional temperature cloud chart of the rubber part of the rubber thick product, using an isosurface view, adjusting a temperature scale, roughly determining the position of the lowest point of the rubber temperature, carrying out view sectioning on the position of the lowest point of the rubber temperature, modifying the temperature display precision of the temperature scale to be 0.1 ℃, enabling the temperature display precision of the position of the lowest point of the temperature to be 0.1 ℃, and being convenient for distinguishing the position of the lowest point of the temperature with two temperature values close to each other, thereby more accurately finding the position of the lowest point of the temperature, enabling accurate temperature valleys to appear in the isosurface view, and being convenient for finding the position of the lowest point of the temperature, wherein the temperature valleys are the most difficult vulcanization points of the rubber part of the rubber thick product.
Step eleven: in the case where the cure time needs to be solved,
deriving a temperature data table of the lowest temperature point of the rubber part of the thick rubber product from the transient thermal analysis calculation result, removing all items below 90 ℃ in the data table, placing all the remaining items in the data table into a spreadsheet for operation, wherein the formula is used
In the above, T s To accumulate the equivalent vulcanization time, x is the corresponding number of terms, Δt is the set time step, E is the activation energy of the rubber material, R is the gas constant, T n T is the temperature at the nth item n-1 For the temperature of the preceding item of item n, T 0 The corresponding temperature of the equivalent vulcanization time is calculated;
by calculating the corresponding accumulated equivalent vulcanization time, when the accumulated equivalent vulcanization time reaches the set demolding equivalent vulcanization time when the thick rubber product is actually produced, the corresponding time is the estimated vulcanization time.
According to the method for analyzing the most difficult vulcanization point of the thick rubber product, firstly, a three-dimensional model combined entity which is formed by matching and combining the thick rubber product with a mould and the like is drawn, the three-dimensional model combined entity is used for replacing a combined entity which is formed by matching and combining the thick rubber product and the mould in actual production, thermal analysis software is utilized for carrying out simulation on the three-dimensional model combined entity, namely, the vulcanization process of the simulated combined entity in the actual production process is simulated, the temperature change rule of each part of the thick rubber product is analyzed through a simulation result, the parts (the parts with the highest temperature and the lowest temperature) of the history of heating of the thick rubber product are qualitatively analyzed, a simulation time-three-dimensional temperature cloud picture of the rubber part is drawn, and finally, the lowest temperature point of the thick rubber product, namely the most difficult vulcanization point, is analyzed according to the simulation time-three-dimensional temperature cloud picture.
Therefore, by utilizing the simulation thermal analysis software, the actual production process of the thick rubber product is simulated according to parameter setting in actual production, compared with the prior art, the method has the advantages of low cost, repeated simulation, simple simulation operation process and short running time, and the most difficult vulcanization point of the thick rubber product can be rapidly analyzed through the simulation calculation result.
In addition, the numerical curve of the temperature change of each part of the thick rubber product along with time can be quantitatively obtained through the calculation result of the thermal analysis software, so that the position of the most difficult vulcanization point (the part with the lowest heating history) of the thick rubber product can be conveniently obtained, the temperature change numerical curve of the part is obtained, the equivalent vulcanization time of the part of the rubber material can be rapidly calculated according to the curve, the time of the occurrence of the bubble point of the product can be rapidly determined according to the production experience of the similar thick rubber product, and the time of the occurrence of the bubble point of the thick rubber product can be found out through one or two tests, thereby determining the vulcanization time of the thick rubber product, greatly shortening the process test times and time of the thick rubber product, greatly improving the development efficiency of the product and saving the development cost.
Example 1
The location of the most difficult to cure point of the thick rubber article is analyzed and determined.
A feed end liner of a 6.2m overflow ball mill was produced. According to the traditional experience, the most difficult vulcanization point of the three-dimensional model entity of the thick rubber product is usually determined by the geometric center (namely the gravity center), and similarly, according to the traditional experience, the most difficult vulcanization point of the feeding end lining plate is the geometric center (the gravity center). According to the embodiment of the application, after simulation by adopting thermal analysis software, the position of the most difficult vulcanization point of the feed end lining plate is determined by analyzing the calculation result of the simulation.
Firstly, according to the operations from the first step to the second step, the feeding end lining plate and the mould, the insert and the locating pin for producing the feeding end lining plate are drawn into a precise three-dimensional model entity by using CAD drawing software, and the three-dimensional model entities of the feeding end lining plate, the mould, the insert and the locating pin are combined together according to actual production conditions, so that a three-dimensional model combined entity is obtained. And (3) introducing the three-dimensional model combination entity into thermal analysis software, and performing material assignment on all geometric entities contained in the three-dimensional model combination entity by using a material assignment function of the thermal analysis software according to the operations of the third step, the fourth step and the fourth step. According to the operations from the fifth step to the sixth step, the meshing function of the thermal analysis software is used for meshing the three-dimensional model combination entity according to the material properties and the geometric complexity of the three-dimensional model combination entity to different degrees and different modes.
And then, according to the operation of the step seven, the three-dimensional model combined entity is led into a steady-state thermal analysis module of thermal analysis software, and according to the temperature conditions of the rubber part, the metal framework, the die, the insert and the locating pin of the feeding end lining plate which are actually produced, a constant thermal load is applied to each part of the three-dimensional model combined entity, and steady-state thermal analysis calculation is performed, so that a steady-state thermal analysis calculation result is obtained.
Then, according to the operations from the step eight to the step nine, the three-dimensional model combined entity is led into a transient thermal analysis module of thermal analysis software, and according to the steady-state thermal analysis calculation result, the initial temperature of the rubber part of the feeding end lining plate is set to 90 ℃, the initial temperature of the metal framework is set to 45 ℃, and the initial temperature of the die is set to 100 ℃; setting boundary conditions of transient thermal analysis of the three-dimensional model assembly entity, specifically, setting the upper surface of an upper die cover and the lower surface of a lower die cover of a die asThe process temperature set by the vulcanizing machine is 143 ℃; applying heat convection load to other surfaces of the three-dimensional model combined entity, setting the air temperature value to be 30 ℃ and the heat exchange coefficient to be 0.0000015w/mm 2 The transient thermal analysis simulated run time was set to 1800s more than the process time at which the thick rubber article was actually produced, or 3600s more than the approximate inferred cure time, in the practice of the present application, the transient thermal analysis simulated run time was set to 19200s; setting a time node to be defined as 'time';
Setting the automatic time step as 'no', setting a time step value according to the requirement, specifically, setting the time step value as 180 s-300 s for the process time determined when the thick rubber product is actually produced and only requiring the position of the most difficult vulcanization point to be solved;
setting the time integral to be 'on';
after the setting is finished, a transient thermal analysis module of thermal analysis software is operated to start solving;
and after the solving is completed, obtaining a transient thermal analysis calculation result.
Finally, according to the operation of the step ten, a plurality of time nodes of the transient thermal analysis simulation running time are taken, and a simulation time-three-dimensional temperature cloud chart is drawn on the rubber part of the thick rubber product, so that the simulation time-three-dimensional temperature cloud chart shown in the figure 1 is obtained.
At 19200s, simulated time-three dimensional temperature clouds for different angles of the feed end liner were shown in FIGS. 2 and 3, with a maximum temperature of 143℃at the upper and lower surfaces of the feed end liner; the lowest temperature is 128.02 ℃, is positioned at the center of the feed end lining plate and is biased towards the inner arc side of the feed end lining plate. And (3) carrying out coordinate calibration on the position of the lowest temperature point on the three-dimensional model combination entity, marking the position as the most difficult vulcanization point, then carrying out tapping on the model, and adopting thermal software analysis simulation to obtain tapping position (simulation hole) and tapping position (experience hole) pairs with the geometric center as the reference, such as shown in figure 4.
The simulated hole obtained by thermal software analysis simulation is put into actual production, and compared with the temperature measurement result of the empirical hole based on the geometric center, as shown in fig. 5. The initial temperatures of the simulation hole and the experience hole are 84 ℃, and after the rubber thick product is vulcanized for 50min, the temperatures of the simulation hole and the experience hole are different, specifically the temperature of the experience hole is higher than that of the simulation hole; when the temperature of the empirical hole is 125 ℃ and the temperature of the simulated hole is 120 ℃ after the vulcanization is carried out for 339min, the temperature rising rate of the empirical hole is faster than that of the simulated hole in the vulcanization process; equivalent vulcanization time in the vulcanization process, the empirical hole is 1256s, the simulation hole is 896s, and the equivalent vulcanization time difference between the empirical hole and the simulation hole is 360s; when the automatic demolding is carried out according to the setting of the equivalent vulcanization time of the empirical hole as 1200s, the equivalent vulcanization time of the simulated hole as 861s is just over the bubble point of the NP-01 glue. Therefore, the simulated hole obtained by analysis by the method provided by the embodiment of the application has higher accuracy through actual temperature measurement comparison. In addition, compared with the prior art, the method has the advantages of low cost and easiness in execution.
Example 2
Solving the vulcanization time of the thick rubber product.
Barrel lifting bars of 6.1X6.4 semi-autogenous mill were produced, which had a thickness of 300mm and were irregularly shaped.
To determine the most difficult cure point of the barrel lifting bar, thermal analysis software was used to thermally analyze the entirety of the barrel lifting bar and its mold assembly. Firstly, operating according to the first step to the seventh step, then setting the initial temperature of the rubber part of the cylinder lifting bar to 90 ℃, setting the initial temperature of the metal framework to 45 ℃ and setting the initial temperature of the die to 100 ℃; setting the transient thermal analysis simulation running time to 36000s to obtain a temperature data graph of the whole cylinder lifting bar, wherein the temperature data graph comprises a temperature change curve of a highest temperature point, a temperature change curve of a lowest temperature point and an average temperature change curve, as shown in fig. 6. For fig. 6, the term below 90 ℃ is eliminated, and the value of the lowest point of the temperature (i.e., the value on curve G) is placed in the electronic table for calculation, using the following formula:
an equivalent cure time versus time plot is obtained as shown in fig. 7. Setting the equivalent vulcanization time of the demolding to 800s, carrying the equivalent vulcanization time-time curve graph into the equivalent vulcanization time-time curve graph to obtain the equivalent vulcanization time of the theoretical demolding to 20460s, analyzing the simulation time-three-dimensional temperature cloud picture of the whole barrel lifting bar in the time period, and then carrying out cross section on the position of the lowest temperature point of the barrel lifting bar, as shown in fig. 8. Because the most difficult vulcanization point of the thick rubber product is positioned on the central line of the thick rubber product, the thermocouple can reach the position by taking any position on the central line for perforating.
In the actual production process, setting the equivalent vulcanization time of the demolding to be 710s, sampling the position of the most difficult vulcanization point of the thick rubber product by using a driller after the thick rubber product is demolding, and finding that the position contains small bubbles after sampling, so that the position is not completely vulcanized; the equivalent vulcanization time of the demolding is changed to 850s, sampling is carried out again after the demolding, and the position of the most difficult vulcanization point is found to be free of bubbles after sampling. Then, other positions of the thick rubber product were randomly sampled, and no air bubbles were contained. Therefore, when the equivalent vulcanization time of the most difficult vulcanization point of the cylinder lifting bar is calculated, the equivalent vulcanization time of the demolding is set to be about 850s, and the complete vulcanization of the thick rubber product can be realized.
While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the invention is defined by the appended claims.
Claims (10)
1. A method for analyzing the most difficult vulcanization point of a thick rubber article, comprising the steps of:
Step one: measuring the actual size of a thick rubber product to obtain the actual size of the thick rubber product, wherein the thick rubber product comprises a rubber part and a metal framework, and the metal framework is internally arranged in the rubber part;
measuring the actual sizes of the die, the insert and the positioning pin matched with the die to obtain the actual sizes of the die, the insert and the positioning pin;
wherein, the mould is a forming mould matched with the thick rubber product in actual production;
step two: drawing a rubber thick product three-dimensional model entity of the rubber thick product according to the actual size of the rubber thick product;
drawing a mould three-dimensional model entity of the mould according to the actual size of the mould;
drawing an insert three-dimensional model entity of the insert according to the actual size of the insert;
drawing a locating pin three-dimensional model entity of the locating pin according to the actual size of the locating pin;
matching and combining the rubber thick product three-dimensional model entity, the mold three-dimensional model entity, the insert three-dimensional model entity and the locating pin three-dimensional model entity together to obtain a three-dimensional model combined entity;
step three: the three-dimensional model combined entity is led into thermal analysis software, then the three-dimensional model combined entity is divided into a plurality of parts according to different material properties and named respectively, and after the material properties are divided, each part of the three-dimensional model combined entity after the material properties are divided is added with a label corresponding to the material properties;
Step four: according to the material attribute of each part of the three-dimensional model combined entity after the material attribute division is completed, recording the heat conductivity information of the corresponding material, and giving the heat conductivity information to each part of the three-dimensional model combined entity with the corresponding label after the material attribute division is completed;
step five: in the thermal analysis software, setting the surface-to-surface contact between every two parts in the three-dimensional model combined entity after finishing material attribute division as "bonded", and adjusting the "Pinball Region" as "Auto Detection Value", so that the thermal analysis software automatically adjusts the value of the "Pinball Region", thereby ensuring that the value of the "Pinball Region" is smaller than the size of a unit grid set in the later step under any condition; or, manually adjusting the value of the Pinball Region to adapt to the size of the unit grid set in the later step;
step six: performing grid division on each part of the three-dimensional model combined entity after material attribute division by using a grid division function of the thermal analysis software;
step seven: importing the three-dimensional model combined entity after grid division into a steady-state thermal analysis module of the thermal analysis software, applying constant thermal load to each part of the three-dimensional model combined entity after grid division according to the temperature conditions of the rubber part, the metal framework, the die, the insert and the locating pin before the actual production of the thick rubber product, and acting on the three-dimensional model combined entity after grid division, and simultaneously, running steady-state thermal analysis calculation to obtain a steady-state thermal analysis calculation result;
Step eight: importing the three-dimensional model combined entity after grid division and the steady-state thermal analysis calculation result into a transient thermal analysis module of the thermal analysis software, and taking the steady-state thermal analysis calculation result as an initial temperature setting condition of transient thermal analysis;
step nine: in the transient thermal analysis module, applying constant thermal load to the upper surface of the upper die cover and the lower surface of the lower die cover of the three-dimensional model combined entity after grid division, and setting the temperature of the upper die cover and the lower surface as the process temperature set by a vulcanizing machine during actual production of the thick rubber product;
applying heat convection load to other surfaces of the three-dimensional model combined entity after grid division, setting an air temperature value, a heat exchange coefficient and transient thermal analysis simulation running time, and defining a set time node as time;
setting the automatic time step as 'no', and setting a time step value according to the requirement;
setting the time integral to be 'on';
after the setting is finished, the transient thermal analysis module of the thermal analysis software is operated to start solving;
after the solving is completed, obtaining a transient thermal analysis calculation result;
step ten: taking a plurality of time nodes of the transient thermal analysis simulation running time, and drawing a simulation time-three-dimensional temperature cloud picture for the rubber part of the thick rubber product;
And adjusting the time axis of the simulated time-three-dimensional temperature cloud picture to a time node corresponding to the determined process time when the thick rubber product is actually produced, obtaining a three-dimensional temperature cloud picture of the rubber part, using an isosurface view, adjusting a temperature scale, determining the position of the lowest point of the rubber temperature, carrying out view sectioning on the position of the lowest point of the rubber temperature, modifying the temperature display precision of the temperature scale to be 0.1 ℃, and enabling accurate temperature valleys to appear in the isosurface view, wherein the temperature valleys are the most difficult vulcanization points of the rubber part.
2. The method according to claim 1, wherein the three-dimensional model entity of the thick rubber product, the three-dimensional model entity of the mold, the three-dimensional model entity of the insert and the three-dimensional model entity of the locating pin in the second step are CAD three-dimensional model entities.
3. The method for analyzing the most difficult vulcanization point of a thick rubber product according to claim 1, wherein in the third step, the three-dimensional model assembly entity is imported into thermal analysis software, and then the three-dimensional model assembly entity is divided into a plurality of parts according to different material properties and named respectively, and the method comprises the following steps:
The three-dimensional model combined entity is imported into thermal analysis software, and then the three-dimensional model combined entity is divided into 4 parts according to different material properties and named respectively, specifically:
for the upper die cover, lower die cover and outer rim of the die, named "outide mould";
for the insert and the locating pin, named "insert mould";
the rubber parts of the thick rubber products are further divided according to different rubber types and are respectively named as corresponding rubber marks and rubber;
for the metal framework, the metal framework is further divided according to the difference of materials of the metal framework, and the metal framework is named as corresponding metal framework material+skeleton;
after the material attribute is divided, adding a label corresponding to the material attribute on each part of the three-dimensional model combination entity after the material attribute is divided.
4. The method of analyzing the most difficult-to-cure point of a thick rubber product according to claim 1, wherein in the fifth step, the unit cell is sized such that an upper cover, a lower cover, and an outer frame of the mold > the insert and the positioning pin > the rubber portion of the thick rubber product = the metal skeleton.
5. The method of analyzing the most difficult-to-cure point of a thick rubber product according to claim 1, wherein in the sixth step, the meshing of each part of the three-dimensional model assembly body after the completion of the material property meshing using the meshing function of the thermal analysis software comprises:
for the upper die cover, the lower die cover and the outer frame of the die, a Hex domino grid dividing mode is used, an Element Order is set as linear, if generation of the Hex domino grid fails, the three-dimensional model combination entity is readjusted, the three-dimensional model combination entity is split or combined to form a regular convex body, and a split part is connected with a part by using a bond;
for the insert and the locating pin, an Automatic grid division mode is used, and an Element Order is set to be a quadric so as to reduce calculation errors;
for the rubber part of the thick rubber product, whether or not it is regular, forcing its meshing mode to Tetrahedrons, setting its "Element Order" to "quadric";
for the metal skeleton, the Element Order was set to "quadric" using tetrahedron meshing.
6. The method of claim 1, wherein in step nine, the air temperature value is set at 30 ℃.
7. The method of analyzing the most difficult to cure point of a thick rubber article according to claim 1, wherein in said step nine, said heat exchange coefficient is set to 0.0000015w/mm 2 ·℃。
8. The method of claim 1, wherein in step nine, the transient thermal analysis simulation run time is set to 1800s more than the process time when the thick rubber article is actually produced or 3600s more than the estimated cure time.
9. The method according to claim 1, wherein in the step nine, for the process time determined when the thick rubber product is actually produced, and only the position of the most difficult vulcanization point is required to be solved, the set time step value is 180 s-300 s;
in the case where the vulcanization time needs to be solved, the time step is set to 60s.
10. The method of analyzing the most difficult vulcanization point of a thick rubber article according to claim 1, further comprising the step eleven of, for the case where the vulcanization time needs to be solved:
Deriving a temperature data table of the lowest temperature point of the rubber part of the thick rubber product from the transient thermal analysis calculation result, removing all items below 90 ℃ in the data table, placing all the remaining items in the data table into a spreadsheet for operation, wherein the formula is used
In the above, T s For the accumulated equivalent vulcanization time, x is the corresponding item number, deltat is the set time step, E is the activation energy of the rubber material, R is the gas constant, T n T is the temperature at the nth item n-1 For the temperature of the preceding item of item n, T 0 The corresponding temperature of the equivalent vulcanization time is calculated;
and calculating the corresponding accumulated equivalent vulcanization time, and when the accumulated equivalent vulcanization time reaches the set demolding equivalent vulcanization time when the thick rubber product is actually produced, obtaining the corresponding time as the estimated vulcanization time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310842142.1A CN116698903A (en) | 2023-07-11 | 2023-07-11 | Method for analyzing most difficult vulcanization point of thick rubber product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310842142.1A CN116698903A (en) | 2023-07-11 | 2023-07-11 | Method for analyzing most difficult vulcanization point of thick rubber product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116698903A true CN116698903A (en) | 2023-09-05 |
Family
ID=87827722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310842142.1A Pending CN116698903A (en) | 2023-07-11 | 2023-07-11 | Method for analyzing most difficult vulcanization point of thick rubber product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116698903A (en) |
-
2023
- 2023-07-11 CN CN202310842142.1A patent/CN116698903A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108062427A (en) | The method that gradient rate controlling based on numerical computations reduces turbine disk forging residual stress | |
| CN102567582A (en) | Finite-element analysis-based method for designing profile of autoclave molding fixture of composite material member | |
| CN105528484A (en) | CAE simulation analysis method of workpiece forming force, and forming device optimization method | |
| CN101923589B (en) | Method for simulating radial tire forming process | |
| CN112257303A (en) | Thermal simulation model-based temperature stability time testing method | |
| CN111259583A (en) | IGBT module solder layer fatigue aging failure simulation method based on voidage | |
| CN109918704B (en) | Die forging die life prediction method based on finite element simulation | |
| CN112304478A (en) | Residual stress testing method based on creep profile method | |
| CN105138806B (en) | The strength check methods of hydro-pneumatic spring not uniform thickness annular valve block | |
| CN116698903A (en) | Method for analyzing most difficult vulcanization point of thick rubber product | |
| CN111444619B (en) | Online analysis method and equipment for injection mold cooling system | |
| CN104646976A (en) | Quick profile manufacturing method of composite material thin-shell mold for aircraft | |
| CN111859735A (en) | Optimization method of process for repairing shaft surface wear part through laser cladding | |
| CN106093115A (en) | A kind of rubber heat conductivity accuracy tester | |
| CN102708233A (en) | Reliability implementing capability assessment method applicable to surface mounting process | |
| CN112906136B (en) | Method and system for predicting laser thermoforming deformation of hull plate | |
| US10551279B2 (en) | Surface demoldability prediction model | |
| CN115416192A (en) | Intelligent control rubber vulcanization process, method and system | |
| CN212208299U (en) | Heating plate surface structure for hot bending machine based on ANSYS simulation analysis | |
| CN112307575B (en) | Method for checking qualification of composite material wallboard part for judging assembly result | |
| CN114833973A (en) | Simulation auxiliary vulcanization method for large-size shock insulation rubber support | |
| CN105334820B (en) | A kind of process intelligent optimization production method of radial tire detachable mould | |
| CN113798368A (en) | Curved panel forming method | |
| CN102861850B (en) | Reverse design method based on large torsion angle rotor blade die forging production | |
| CN106779322A (en) | Obey the value working procedure ability estimation method of reckoning by the piece of bi-distribution |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |