CN109624150A - Rubber injection cold runner design and optimization method - Google Patents
Rubber injection cold runner design and optimization method Download PDFInfo
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- CN109624150A CN109624150A CN201811508285.4A CN201811508285A CN109624150A CN 109624150 A CN109624150 A CN 109624150A CN 201811508285 A CN201811508285 A CN 201811508285A CN 109624150 A CN109624150 A CN 109624150A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3835—Designing moulds, e.g. using CAD-CAM
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
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- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
A kind of rubber injection cold runner design and optimization method, comprising the following steps: cast gate quantity and position are determined according to required rubber product parameter, is determined according to gate location and shunts path；By fluid motion equation, the diameter of each runner is primarily determined, keep the pressure at each cast gate equal；The inlet flow rate of cold runner needed for rule of thumb formula determines and the value range of gate diameter；Using inlet flow rate, gate diameter and each runner diameter in cold runner running gate system as variable, by orthogonal trial orthogonal test；Three dimensional design is carried out to cold runner test group using PRO/E software, sunykatuib analysis is carried out to pressure field, velocity field and the shear rate field during rubber flowing in cold runner with POLYFLOW software；It is required to establish appraisement system to analog result according to required product；Using the application method, the design cycle of rubber injection cold runner can be shortened, and ensure that the reasonability and reliability of cold runner design.
Description
Technical field
The present invention relates to rubber injection cold runner design field, the design and optimization of specifically a kind of rubber injection cold runner
Method.
Background technique
Development of Rubber Injection Molding Technology is mainly used in the small-sized rubber product of multimode multi-cavity and the large-scale rubber of symmetrical configuration
Product.The cold runner of the rubber product of symmetrical configuration is in design, easy to accomplish each since the symmetry of its structure is relatively simple
The injection pressure of a cast gate and the consistency of injection speed；And the asymmetrical large-scale rubber product cold runner of structure is in design,
It is not easily accomplished the consistency of each gated injection pressure and injection speed, therefore this rubber product holds in injection moulding
It is also easy to produce that quality is uneven, bubble and other issues.And large-scale rubber product asymmetrical for structure is generally used and is molded into
The method of type, but this method there are shaping efficiencies it is low, unstable quality and manipulation strength are big the problems such as.
Summary of the invention
It is a primary object of the present invention to propose a kind of design and optimization method of rubber injection cold runner, finite element is utilized
Simulation analysis is designed and optimizes to cold runner with response surface design analytic approach in conjunction with orthogonal design, reduces rubber injection cold flow
The design cycle in road improves the reasonability and reliability of cold runner design.
To achieve the above objectives, technical scheme is as follows:
A kind of rubber injection cold runner design and optimization method, comprising the following steps:
Step 1, by means of cold runner running gate system, cold runner running gate system includes sprue, is arranged in sprue upper end
Entrance, import and sprue outlet connection runner and the cast gate that is connected with the outlet of corresponding runner；Firstly, selected
The rubber product of required forming；Then, three-dimensional modeling is carried out to rubber product；Secondly, true according to the required rubber product parameter
Determine cast gate quantity and position；Again, it is determined according to gate location and shunts path；
Step 2, firstly, meet the pressure at each cast gate of step 1 it is equal under the premise of, by fluid motion equation,
Primarily determine the diameter of each runner；
Step 3, the inlet flow rate of cold runner needed for rule of thumb formula determines and the value range of gate diameter；
Step 4 is straight with each runner in the inlet flow rate in step 3, the gate diameter in step 3 and step 2
Diameter is variable, determines several design schemes；Then, orthogonal test is designed to design scheme by orthogonal arrage；Secondly, according to orthogonal examination
It tests, two or more cold runner test groups is established in artificial setting；
Step 5, firstly, carrying out three-dimensional respectively to each cold runner test group after permutation and combination using PRO/E software
Modeling；Then, with POLYFLOW software to pressure field, velocity field and the shear rate field during rubber flowing in cold runner
Finite element analysis is carried out, sunykatuib analysis result is obtained；
Step 6, firstly, the rubber product according to needed for step 1 requires to establish evaluation to the sunykatuib analysis result of step 5
System evaluates every sunykatuib analysis result of each design scheme in step 5；
A. the pressure field analysis of each design scheme is evaluated, with each gate outlet pressure uniformly and integral pressure drop it is small
Standard is used as to be excellent；
B. the analysis of Velocity Field of each design scheme is evaluated, is uniformly excellent as standard using each gate outlet speed；
C. the shear rate field analysis of each design scheme is evaluated, is with shear rate value approach optimum valuing range
It is excellent to be used as standard；
Then, d. assigns weight to evaluation every in a-c, calculates total score；
Step 7 firstly, being analyzed using response surface design analytic approach test data, and carries out design scheme excellent
Change；
A. estimate the regression coefficient in each design scheme using least-squares estimation, to regression equation and regression coefficient into
Row significance test, obtains response surface design, acquires preferred result；
B. rise search method using steepest, optimized design scheme is determined in preferred result.
Wherein, fluid motion equation selects Poiseuille's law in the step 2:
Further, in step 5, FEM Numerical Simulation should include that material defines, and grid dividing defines perimeter strip
Part；
A. grid division, selects tetrahedral grid, and the expansion number of plies and multiple is arranged to boundary in setting size of mesh opening；
B. boundary condition is defined, the model for defining cold runner is the isothermal steady-state model of generalized Newtonian fluid, constitutive equation
Select Power Law model, and following parameter is arranged: power law index, slack time, viscosity coefficient, entrance are set as INFLOW；
And according to scheme inlet flow rate, mode is restrained using Picate in simulation process；Outlet is disposed as OUTFLOW；Perimeter strip
Part is runner wall surface without sliding；
C. it is solved and is calculated using POLYFLOW software.
Further, in step 5, the warm fluid model of the newton of broad sense is selected to be configured in POLYFLOW.
Further, in step 6, appraisement system uses ten point system, to pressure field analysis, analysis of Velocity Field, shearing speed
Three analysis results of rate field analysis determine superiority and inferiority level, formulate evaluation criterion, artificial to give a mark.
Further, in step 6, according to the difference of required product parameter in c, best shear rate value is also different, needs
It is voluntarily calculated according to required.
Further, in step 6, weighted value in d, according to pressure field analysis, analysis of Velocity Field and shearing
Rate field analysis three's importance, it is artificial to determine.
Further, it in step 7, is analyzed in a using a response surface design analytic approach.
Further, in step 7, in b, premise is to ensure that the reliability of optimum results, firstly, again to optimum results
Secondary carry out finite element analysis, and evaluated；Secondly, designing steepest buildup tests according to the optimizing step-length of steepest ascent；Most
Eventually in the hope of optimal result.
The present invention has the advantage that and effect:
(1) existing finite element theory is used, it is cold to rubber injection under the support of finite element analysis software POLYFLOW
The pressure field of runner, velocity field, shear rate field carry out sunykatuib analysis, provide good reason for the design and optimization of cold runner
By basis.
(2) finite element analysis is effectively risen the optimizations such as search method with orthogonal design, response surface design analytic approach, steepest to set
Meter method combines, and makes entirely to design and optimization process has that the period is short, at low cost, high reliability.
(3) the design optimization method is applicable to various rubber products symmetrically or non-symmetrically, has good applicability.
Detailed description of the invention
Fig. 1: for design and optimization flow chart of the present invention；
Fig. 2: for high-speed rail motor-car outer hood three-dimensional figure；
Fig. 3: for cold runner three-dimensional figure concrete application structural schematic diagram；
Fig. 4: for cold runner three-dimensional figure.
Sprue (1)；Entrance (2)；Runner (3)；Cast gate (4)
Specific embodiment
Picture 1-4, a kind of rubber injection cold runner design and optimization method, comprising the following steps:
Step 1, by means of cold runner running gate system, cold runner running gate system includes sprue 1, is arranged on sprue 1
Cast gate 4 of the entrance 2, import at end with the runner 3 of the outlet of sprue 1 connection and with corresponding runner 3 outlet connection；It is first
First, the rubber product shaped needed for selecting；Then, three-dimensional modeling is carried out to rubber product；Secondly, according to the required rubber product
Parameter determines cast gate quantity and position；Again, it is determined according to gate location and shunts path；
Step 2, firstly, meet the pressure at each cast gate of step 1 it is equal under the premise of, by fluid motion equation,
Primarily determine the diameter of each runner；
Step 3, the inlet flow rate of cold runner needed for rule of thumb formula determines and the value range of gate diameter；
Step 4 is straight with each runner in the inlet flow rate in step 3, the gate diameter in step 3 and step 2
Diameter is variable, determines several design schemes；Then, orthogonal test is designed to design scheme by orthogonal arrage；Secondly, according to orthogonal examination
It tests, two or more cold runner test groups is established in artificial setting；
Step 5, firstly, carrying out three-dimensional respectively to each cold runner test group after permutation and combination using PRO/E software
Modeling；Then, with POLYFLOW software to pressure field, velocity field and the shear rate field during rubber flowing in cold runner
Finite element analysis is carried out, sunykatuib analysis result is obtained；
Step 6, firstly, the rubber product according to needed for step 1 requires to establish evaluation to the sunykatuib analysis result of step 5
System evaluates every sunykatuib analysis result of each design scheme in step 5；
A. the pressure field analysis of each design scheme is evaluated, with each gate outlet pressure uniformly and integral pressure drop it is small
Standard is used as to be excellent；
B. the analysis of Velocity Field of each design scheme is evaluated, is uniformly excellent as standard using each gate outlet speed；
C. the shear rate field analysis of each design scheme is evaluated, is with shear rate value approach optimum valuing range
It is excellent to be used as standard；
Then, d. assigns weight to evaluation every in a-c, calculates total score；
Step 7 firstly, being analyzed using response surface design analytic approach test data, and carries out design scheme excellent
Change；
A. estimate the regression coefficient in each design scheme using least-squares estimation, to regression equation and regression coefficient into
Row significance test, obtains response surface design, acquires preferred result；
B. rise search method using steepest, optimized design scheme is determined in preferred result.
Wherein, fluid motion equation selects Poiseuille's law in the step 2:
Further, in step 5, FEM Numerical Simulation should include that material defines, and grid dividing defines perimeter strip
Part；
A. grid division, selects tetrahedral grid, and the expansion number of plies and multiple is arranged to boundary in setting size of mesh opening；
B. boundary condition is defined, the model for defining cold runner is the isothermal steady-state model of generalized Newtonian fluid, constitutive equation
Select Power Law model, and following parameter is arranged: power law index, slack time, viscosity coefficient, entrance are set as INFLOW；
And according to scheme inlet flow rate, mode is restrained using Picate in simulation process；Outlet is disposed as OUTFLOW；Perimeter strip
Part is runner wall surface without sliding；
C. it is solved and is calculated using POLYFLOW software.
Further, in step 5, the warm fluid model of the newton of broad sense is selected to be configured in POLYFLOW.
Further, in step 6, appraisement system uses ten point system, to pressure field analysis, analysis of Velocity Field, shearing speed
Three analysis results of rate field analysis determine superiority and inferiority level, formulate evaluation criterion, artificial to give a mark.
Further, in step 6, according to the difference of required product parameter in c, best shear rate value is also different, needs
It is voluntarily calculated according to required.
Further, in step 6, weighted value in d, according to pressure field analysis, analysis of Velocity Field and shearing
Rate field analysis three's importance, it is artificial to determine.
Further, it in step 7, is analyzed in a using a response surface design analytic approach.
Further, in step 7, in b, premise is to ensure that the reliability of optimum results, firstly, again to optimum results
Secondary carry out finite element analysis, and evaluated；To continue to improve the reliability optimized, secondly, seeking according to steepest ascent
Excellent step-length designs steepest buildup tests；Finally in the hope of optimal result.
Below by taking high-speed rail motor-car outer hood as an example, in conjunction with Figure of description 1-4 to a specific embodiment of the invention make into
The description of one step.
(1) the cold runner running gate system for establishing high-speed rail motor-car outer hood models high-speed rail motor-car outer hood triangle；According to height
The parameter of iron motor-car outer hood determines cast gate quantity and position, as shown in Figure 2；And determined according to gate location and shunt path,
As shown in Figure 3.
(2) it by Poiseuille's law, primarily determines the diameter of each runner, keeps the pressure at each cast gate equal, such as Fig. 3 institute
Show, each runner diameter is chosen to be 13mm, 14mm, 12mm, 11mm, 9mm, 8mm, 9mm respectively.
(3) the inlet flow rate value range of cold runner needed for rule of thumb formula determines is 73~90cc, gate diameter
Value range is 2~10mm.
(4) runner 6 is only selected to optimize in this example, with inlet flow rate, the gate diameter in cold runner running gate system
It is variable with 6 diameter of runner, by orthogonal arrage L8(27) design orthogonal test.The diameter of runner 6 takes 8mm and 8.5mm, cast gate
Diameter takes 6mm and 7mm, and inlet flow rate takes 73cc and 90cc.
(5) three-dimensional modeling is carried out using cold runner of the PRO/E software to 8 kinds of design schemes, threedimensional model is imported into
In POLYFLOW software；
A. grid division, this example select tetrahedral grid, and size of mesh opening 4mm, it is 4 that the expansion number of plies, which is arranged, to boundary,
Multiple is 1；
B. boundary condition is defined, the model for defining cold runner is the isothermal steady-state model of generalized Newtonian fluid, constitutive equation
Select Power Law model, the parameter of setting are as follows: power law index 0.3, slack time are set to 1, viscosity coefficient 59572；Enter
Mouthful setting INFLOW, and according to scheme input entrance flow, suggest restraining mode using Picate in simulation process；8 outlets
It is disposed as OUTFLOW；Boundary condition is runner wall surface without sliding, i.e., any velocity component is 0；
C. it is solved and is calculated using POLYFLOW software；
(6) appraisement system is established to analog result, every sunykatuib analysis result of each design scheme is evaluated, use
Ten point system is manually given a mark.
A. the pressure field analysis of each design scheme is evaluated, uniformly and integral pressure drop smaller is with each outlet pressure
It is excellent；
B. the analysis of Velocity Field of each design scheme is evaluated, is uniformly excellent with each muzzle velocity；
C. the shear rate field analysis of each design scheme is evaluated, optimum valuing range is approached with shear rate value
102~104/ s is excellent；
D. items are evaluated and assigns weight, the uniformity of pressure and speed is even more important in this example, therefore makes pressure field point
The weight of analysis and analysis of Velocity Field is 0.35, and the weight of shear rate field analysis is 0.3, and calculates total score.
(7) test data is analyzed using response surface design analytic approach, and design is optimized.
A. each regression coefficient is estimated using least-squares estimation, conspicuousness inspection is carried out to regression equation and regression coefficient
It tests, obtains response surface design；
B. rise search method using steepest and acquire optimal design.
6 diameter of runner is 8.5mm, gate diameter 6mm, inlet flow rate 90cc.
Examples detailed above is one embodiment of the present invention, but a specific embodiment of the invention is not limited by examples detailed above
System, other any changes, modification, simplification without departing from spirit of the invention and principle are regarded as protection model of the invention
It encloses.
Claims (9)
1. a kind of rubber injection cold runner design and optimization method, which comprises the following steps:
Step 1, by means of cold runner running gate system, cold runner running gate system includes sprue, entering for sprue upper end is arranged in
The cast gate of mouth, import with the runner of sprue outlet connection and with corresponding runner outlet connection；Firstly, needed for selected
The rubber product of forming；Then, three-dimensional modeling is carried out to rubber product；Secondly, being poured according to the required rubber product parameter determination
Mouth quantity and position；Again, it is determined according to gate location and shunts path；
Step 2, firstly, meet the pressure at each cast gate of step 1 it is equal under the premise of, by fluid motion equation, tentatively
Determine the diameter of each runner；
Step 3, the inlet flow rate of cold runner needed for rule of thumb formula determines and the value range of gate diameter；
Step 4 is with each runner diameter in the inlet flow rate in step 3, the gate diameter in step 3 and step 2
Variable determines several design schemes；Then, orthogonal test is designed to design scheme by orthogonal arrage；Secondly, according to orthogonal test,
Two or more cold runner test groups is established in artificial setting；
Step 5 is built firstly, carrying out three-dimensional respectively to each cold runner test group after permutation and combination using PRO/E software
Mould；Then, with POLYFLOW software in cold runner rubber flowing during pressure field, velocity field and shear rate field into
Row finite element analysis obtains sunykatuib analysis result；
Step 6, firstly, the rubber product according to needed for step 1 requires to establish appraisement system to the sunykatuib analysis result of step 5,
Every sunykatuib analysis result of each design scheme in step 5 is evaluated；
A. the pressure field analysis of each design scheme is evaluated, uniformly and integral pressure drop is small to be excellent with each gate outlet pressure
As standard；
B. the analysis of Velocity Field of each design scheme is evaluated, is uniformly excellent as standard using each gate outlet speed；
C. the shear rate field analysis of each design scheme is evaluated, with shear rate value approach optimum valuing range for excellent work
For standard；
Then, d. assigns weight to evaluation every in a-c, calculates total score；
Step 7 firstly, being analyzed using response surface design analytic approach test data, and optimizes design scheme；
A. the regression coefficient in each design scheme is estimated using least-squares estimation, regression equation and regression coefficient is shown
Work property is examined, and is obtained response surface design, is acquired preferred result；
B. rise search method using steepest, optimized design scheme is determined in preferred result.
2. rubber injection cold runner design and optimization method according to claim 1, which is characterized in that in the step 2
Fluid motion equation selects Poiseuille's law:
3. rubber injection cold runner design and optimization method according to claim 1, which is characterized in that in step 5,
FEM Numerical Simulation should include that material defines, and grid dividing defines boundary condition；
A. grid division, selects tetrahedral grid, and the expansion number of plies and multiple is arranged to boundary in setting size of mesh opening；
B. boundary condition is defined, the model for defining cold runner is the isothermal steady-state model of generalized Newtonian fluid, constitutive equation selection
Power Law model, and following parameter is set: power law index, slack time, viscosity coefficient, entrance are set as INFLOW；And root
According to scheme inlet flow rate, mode is restrained using Picate in simulation process；Outlet is disposed as OUTFLOW；Boundary condition is
Runner wall surface is without sliding；
C. it is solved and is calculated using POLYFLOW software.
4. rubber injection cold runner design and optimization method according to claim 1, which is characterized in that in step 5,
The warm fluid model of the newton of broad sense is selected to be configured in POLYFLOW.
5. rubber injection cold runner design and optimization method according to claim 1, which is characterized in that in step 6,
Appraisement system uses ten point system, determines superiority and inferiority to three pressure field analysis, analysis of Velocity Field, shear rate field analysis analysis results
Level formulates evaluation criterion, artificial to give a mark.
6. rubber injection cold runner design and optimization method according to claim 1, which is characterized in that in step 6, c
The difference of the middle product parameter according to needed for, best shear rate value is also different, needs voluntarily to be calculated according to required.
7. rubber injection cold runner design and optimization method according to claim 1, which is characterized in that in step 6, d
In weighted value, it is artificial to determine according to pressure field analysis, analysis of Velocity Field and shear rate field analysis three's importance.
8. rubber injection cold runner design and optimization method according to claim 1, which is characterized in that in step 7, a
It is middle to be analyzed using a response surface design analytic approach.
9. rubber injection cold runner design and optimization method according to claim 1, which is characterized in that in step 7, b
In, premise is to ensure that the reliability of optimum results, firstly, carrying out finite element analysis again to optimum results, and is evaluated；Its
It is secondary, according to the optimizing step-length of steepest ascent, design steepest buildup tests；Finally acquire optimal result.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110688802A (en) * | 2019-09-30 | 2020-01-14 | 株洲时代新材料科技股份有限公司 | Equivalent processing method, system and medium for glue injection runner in filling analysis of metal rubber composite product |
| CN113710460A (en) * | 2019-04-25 | 2021-11-26 | 弗罗伊登伯格欧洲股份公司 | Additive manufacturing method for manufacturing a shaped body from an elastomer |
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