CN106503389A - A kind of numerical method of quick determination drop stamping production line process parameter - Google Patents
A kind of numerical method of quick determination drop stamping production line process parameter Download PDFInfo
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- CN106503389A CN106503389A CN201610984974.7A CN201610984974A CN106503389A CN 106503389 A CN106503389 A CN 106503389A CN 201610984974 A CN201610984974 A CN 201610984974A CN 106503389 A CN106503389 A CN 106503389A
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- drop stamping
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- 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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/06—Multi-objective optimisation, e.g. Pareto optimisation using simulated annealing [SA], ant colony algorithms or genetic algorithms [GA]
Abstract
The invention discloses a kind of numerical method of quick determination drop stamping production line process parameter, including choosing technological parameter to be determined and quality evaluation index parameter；Determine technological parameter span；Stochastic sampling produces fundamental technology supplemental characteristic；Obtain the data model of the product that the drop stamping production line under fundamental technology parameter is produced；Ask for the meansigma methodss of each index parameter in data model；The mapping relations that sets up between fundamental technology parameter and index parameter meansigma methodss；Obtain technological parameter reference value during index parameter optimization；Optimal actual process parameter is obtained on the basis of technological parameter reference value.The inventive method can quickly, science determine drop stamping production line supplemental characteristic, it will be apparent that shorten mode processes and make and field adjustable process, accelerate the development process of product, and ensure the stability of properties of product.
Description
Technical field
The invention belongs to specifically related to a kind of numerical method of quick determination drop stamping production line process parameter.
Background technology
With the development and the improvement of people's living standards of economic technology, the lightweight and safety of body of a motor car into
One of important development direction for vehicle body design structural member.
At present, AHSS (Advanced high strength steel) structural member is because possessing higher tensile strength and work
Less resilience during skill and design in automotive light weight technology, during Crash Safety Design of Vehicles optimization and automobile fuel ecomomy are lifted
Application is more and more extensive.It is heat stamping and shaping technology to prepare the most frequently used technique of the type part in engineering, will plate in height
Punch forming under temperature state, then obtains, after quick cooling, the technology that microstructure is uniform martensite.AHSS sheet materials heating,
Insulation, in the continuous flow procedure such as molding and pressurize quenching, is related to more technological parameter, and these parameters can the punching of combined effect product
The such as martensite distribution of the mass parameter of casting die, tensile strength, Vickers hardness etc..Thus, made in drop stamping part process
Cheng Zhong, improves the accuracy of each technological parameter, shortens the field adjustable cycle, it is ensured that the stability of part quality is to need to solve
A key issue.
However, existing research focus mostly on right in single technological parameter, such as holding temperature, drawing velocity or dwell pressure etc.
The impact of quantity of sintered parts, and how collective effect affects product quality to be not directed to multiple parameters；Thus, which results in work
Skill makes and lacking direction property during field adjustable, is more to complete debugging process by the commissioning experience of Field Force,
Result in debugging efficiency extremely low, and cause product quality concordance poor, the shortcomings of unstable product quality.
Content of the invention
It is an object of the invention to provide a kind of quick, science determines the quick true of drop stamping production line supplemental characteristic
Determine the numerical method of drop stamping production line process parameter.
The numerical method of this quick determination drop stamping production line process parameter that the present invention is provided, comprises the steps：
S1. choose it needs to be determined that drop stamping production line technological parameter and heat-punch member quality evaluation index ginseng
Number；
S2. according to existing project data and experience, the span of the technological parameter of selecting step S1；
S3., in the span that step S2 is selected, stochastic sampling produces N group fundamental technology supplemental characteristics；
S4. the N group fundamental technologies supplemental characteristic for obtaining step S3 is input into the phantom of drop stamping production line, obtains
The data model of the product of the drop stamping production line production under the N groups fundamental technology parameter；
S5. ask in the data model of the N set products that step S4 is obtained, the meansigma methodss of each index parameter；
S6. reflecting between the meansigma methodss of the index parameter that the fundamental technology supplemental characteristic of establishment step S3 and step S5 are obtained
Penetrate relation；
S7. the mapping relations for obtaining according to step S6, turn to optimization aim with index parameter optimum, obtain index parameter most
Technological parameter reference value during optimization；
S8., on the basis of the technological parameter reference value for being obtained by step S7, carry out on actual drop stamping production line
Test and the adjustment of technological parameter, obtain the actual process parameter of optimal drop stamping production line, so as to complete drop stamping
The quick determination of production line process parameter.
Described in step S1 choose drop stamping production line technological parameter be holding temperature, transfer time, pressure-pad-force,
Dwell pressure and pressurize cool time.
The quality evaluation index parameter of the heat-punch member that chooses described in step S1 is Vickers hardness, tensile strength and martensite
Content.
Stochastic sampling described in step S3 is Latin Hypercube Sampling.
Mapping relations of setting up described in step S6 are to set up mapping relations using RBF alternative models.
Technological parameter reference value when obtaining index parameter optimization described in step S7 is to adopt multi-objective genetic algorithm
(MOGA) optimize technological parameter reference value when obtaining index parameter optimization.
The numerical method of this quick determination drop stamping production line process parameter that the present invention is provided, is passed through by engineering first
The span for choosing parameter to be determined is tested, then produced basic data, bring model into and carry out simulation calculation by stochastic sampling
And set up mapping relations, and it is optimized so as to obtaining technological parameter reference during index parameter optimization according to mapping relations
Value, and be optimized on actual production line on the basis of this reference value；Therefore the inventive method can quickly, science determine heat
Sheet Metal Forming Technology production line supplemental characteristic, it will be apparent that shorten mode processes and make and field adjustable process, accelerate the exploitation of product
Journey, and ensure the stability of properties of product.
Description of the drawings
Fig. 1 is method of the present invention flow chart.
Fig. 2 is the relation curve of a kind of holding temperature of embodiment of the present invention and time and crystal grain diameter.
Fig. 3 is a kind of relation curve of the work hardening index of the temperature and 22MnB5 of embodiment of the present invention.
Fig. 4 is a kind of plate cool time of embodiment of the present invention and the relation curve of temperature.
It is plate temperature and die pressure and the relation curve of cool time that Fig. 5 is a kind of embodiment of the present invention.
It is mold temperature and die pressure and the relation curve of cool time that Fig. 6 is a kind of embodiment of the present invention.
Vickers hardness measurement selected point schematic diagrams of the Fig. 7 for embodiments of the invention.
Selection sample schematic diagrams of the Fig. 8 for the tensile strength test of embodiments of the invention.
Measurement selected point schematic diagrams of the Fig. 9 for the part tensile test piece of embodiments of the invention.
Position views of the Figure 10 for the martensitic structure observation selection sample of embodiments of the invention.
The I points observation of martensite microstructure distributions of the Figure 11 for observing under the microscope of embodiments of the invention is illustrated
Figure.
The J points observation of martensite microstructure distributions of the Figure 12 for observing under the microscope of embodiments of the invention is illustrated
Figure.
The K points observation of martensite microstructure distributions of the Figure 13 for observing under the microscope of embodiments of the invention is illustrated
Figure.
Specific embodiment
It is illustrated in figure 1 method of the present invention flow chart：This quick determination drop stamping production line work that the present invention is provided
The numerical method of skill parameter, comprises the steps：
S1. choose it needs to be determined that drop stamping production line technological parameter (such as holding temperature, transfer time, flanging
Power, dwell pressure and pressurize cool time) and heat-punch member quality evaluation index parameter (such as Vickers hardness, tensile strength and
Martensite content)；
S2. according to existing project data and experience, the span of the technological parameter of selecting step S1；
S3., in the span that step S2 is selected, N group fundamental technology parameter numbers are produced using Latin Hypercube Sampling
According to；
S4. the N group fundamental technologies supplemental characteristic for obtaining step S3 is input into the phantom of drop stamping production line, obtains
The data model of the product of the drop stamping production line production under the N groups fundamental technology parameter；
S5. ask in the data model of the N set products that step S4 is obtained, the meansigma methodss of each index parameter；
S6. using the fundamental technology supplemental characteristic and the index parameter that obtains of step S5 of RBF alternative model establishment step S3
Meansigma methodss between mapping relations；
S7. the mapping relations for obtaining according to step S6, turn to optimization aim with index parameter optimum, are optimized with MOGA and are obtained
Technological parameter reference value during index parameter optimization；
S8., on the basis of the technological parameter reference value for being obtained by step S7, carry out on actual drop stamping production line
Test and the adjustment of technological parameter, obtain the actual process parameter of optimal drop stamping production line, so as to complete drop stamping
The quick determination of production line process parameter.
The method of the present invention is further described below in conjunction with a specific embodiment：
By taking the process modeling of body structural member threshold buttress brace as an example：
S1. choose important technological parameter in hot stamping operation first, realized by the control to these parameters to producing
The control of quality.Have chosen holding temperature, transfer time, pressure-pad-force, dwell pressure and pressurize cool time；Heat is chosen simultaneously
Stamping parts quality evaluation index, on the premise of part does not occur the failures such as corrugation cracking, have chosen the Vickers of part style
Hardness, tensile strength, evaluation index of the martensite content as part quality；
S2. establish the approximate range of inputting process parameters by correlation engineering experience, have chosen holding temperature for 880～
960 DEG C, transfer time be 5～12S, pressure-pad-force be 5～10T, the pressurize cool time be 3～15S, dwell pressure be 200～
400T；
S3. by Latin Hypercube Sampling, 50 groups of data have chosen so that 5 |input parametes are rationally evenly distributed on choosing
In the region for taking；
S4. 50 groups of data are distinguished input model, the model that chooses in this patent is representative " several " font
Threshold buttress brace, after carrying out 50 groups of emulation, result is derived；
S5. simulation result is processed in Matlab, obtains the corresponding average Vickers hardness of 50 groups of emulation, average anti-
Tensile strength and average martensite content；
S6. inputting process parameters and output parameter is arranged, and reflecting between input and output is set up using RBF alternative models
Penetrate；
S7. based on industrial needs, Vickers hardness, tensile strength and martensite content are chosen in MOGA optimization process
Maximum as optimization aim, obtain corresponding |input paramete.
S8. the inputting process parameters for finally obtaining are：Holding temperature is 954 DEG C, and transfer time is 5.8S, and pressure-pad-force is
5.5T, pressurize cool time are 9.7S, and dwell pressure is 431T；Under the parameter, the corresponding tensile strength of structure is obtained
For 1480Mpa, Vickers hardness is 487.5, and martensite content is 99.96%.
The debugging stage is entered to optimize the |input paramete for obtaining as foundation in debugging process at the scene, is finally obtained at the scene
More than 1480MPa, more than 480, it is 950 that corresponding |input paramete is holding temperature to Vickers hardness to the product average tensile strength for arriving
DEG C, transfer time is 5S, and pressure-pad-force is 5T, and the pressurize cool time is 10S, and dwell pressure is 400T；
In AHSS thermoforming part punching courses, holding temperature and temperature retention time for austenite crystal nucleation process very
Important, also it is related to follow-up processability, as shown in Fig. 2 when temperature is when 850 DEG C rise to 900 DEG C, austenite crystal is straight
Footpath increases rapidly, while austenite crystal increases also with the accumulation of time.It is demonstrated experimentally that when temperature retention time reaches 5 minutes
Afterwards, austenite crystal starts homogenization, but temperature retention time is long or the too high roughening for also resulting in austenite crystal of temperature, because
And holding temperature is have chosen for 880～960 DEG C.Initial forming temperature has large effect to blank processability, because which affects
Work hardening index to material.As shown in figure 3, initial forming temperature rises to 700 DEG C by 600 DEG C, the processing of 22MnB5 is hard
Change index to raise with the rising of temperature, and when temperature continues to raise, the work hardening index of 22MnB5 begins to decline, because
And choose initial forming temperature and be located at 600～800 DEG C, it is beneficial to the forming process of plate.Plate is transferred to mould by resistance furnace
Temperature drop during tool will also take into full account, be illustrated in fig. 4 shown below, the plate after insulation under room temperature (20 DEG C), in 0～5S
Temperature drops to 1137K by 1200K, drops to 800K in 25～30S temperature by 837K, temperature drop speed pushing away over time
Move gradually slack-off.Dwell pressure and dwell time are the piths of thermoforming process, and dwell pressure and dwell time will be directly
The quality of profiled member is affected, is illustrated in fig. 5 shown below, when the pressure was increased, plate rapid drop in temperature, plate temperature is under 800 degree
The martensite transfor mation finishing temperature used time is down to for 10S, meanwhile, when plate is temperature-resistant, pressure is bigger, and plate temperature drop is got over
Hurry up；It is illustrated in fig. 6 shown below, mold temperature temperature in the stamping period presents downward trend after first rising, mold temperature
When identical, pressure increases, and cooling effectiveness is significantly improved.Thus in actual production process, in the case where equipment tonnage is allowed,
Increase pressure can be obviously improved Cooling capacity in mold, promote the raising of production efficiency.The pressurize that chooses in this patent is quenched
The fiery time is 3～15S, and dwell pressure is 200～400T.
It is illustrated in figure 7 the Vickers hardness measurement selected point schematic diagram of embodiments of the invention；It is the present invention as shown in table 1
In Vickers hardness number simulation result and actual measured results signal table：
1 part Vickers hardness number of table illustrates table
Can see, simulation result is 4.13% with actual measured results mean error.
The selection sample schematic diagram of the tensile strength test of embodiments of the invention, is illustrated in figure 9 this as shown in Figure 8
The measurement selected point schematic diagram of the part tensile test piece of bright embodiment；It is the part tension in the present invention as shown in table 2
The simulation result of intensity level and the signal table of actual measured results：
2 part tensile strength values of table illustrate table
Can see, simulation result is 2.46% with actual measured results mean error.
In order to test the performance of martensite content index, sample is chosen using martensitic structure observation as shown in Figure 10
Position view.The martensite microstructure point that observes under the microscope for being respectively embodiments of the invention as shown in Figure 11～13
I, J and K point observation schematic diagram of cloth.Can see, optical microscope inspection sample also show the geneva of highly uniform distribution
Body is organized.
Claims (7)
1. a kind of numerical method of quick determination drop stamping production line process parameter, comprises the steps：
S1. choose it needs to be determined that drop stamping production line technological parameter and the quality evaluation index parameter of heat-punch member；
S2. according to existing project data and experience, the span of the technological parameter of selecting step S1；
S3., in the span that step S2 is selected, stochastic sampling produces N group fundamental technology supplemental characteristics；
S4. the N group fundamental technologies supplemental characteristic for obtaining step S3 is input into the phantom of drop stamping production line, obtains institute
State the data model of the product that the drop stamping production line under N group fundamental technology parameters is produced；
S5. ask in the data model of the N set products that step S4 is obtained, the meansigma methodss of each index parameter；
S6. the mapping between the meansigma methodss of the index parameter that the fundamental technology supplemental characteristic of establishment step S3 and step S5 are obtained is closed
System；
S7. the mapping relations for obtaining according to step S6, turn to optimization aim with index parameter optimum, obtain index parameter optimization
When technological parameter reference value；
S8., on the basis of the technological parameter reference value for being obtained by step S7, tested on actual drop stamping production line
With the adjustment of technological parameter, the actual process parameter of optimal drop stamping production line is obtained, so as to complete drop stamping production
The quick determination of Wiring technology parameter.
2. the numerical method of quick determination drop stamping production line process parameter according to claim 1, it is characterised in that step
The technological parameter of the drop stamping production line that chooses described in rapid S1 is holding temperature, transfer time, pressure-pad-force, dwell pressure and
The pressurize cool time.
3. the numerical method of quick determination drop stamping production line process parameter according to claim 1, it is characterised in that step
The quality evaluation index parameter of the heat-punch member that chooses described in rapid S1 is Vickers hardness, tensile strength and martensite content.
4. the numerical method of quick determination drop stamping production line process parameter according to claim 2, it is characterised in that step
The quality evaluation index parameter of the heat-punch member that chooses described in rapid S1 is Vickers hardness, tensile strength and martensite content.
5. the numerical method of quick determination drop stamping production line process parameter according to claims 1 to 4, it is characterised in that
Stochastic sampling described in step S3 is Latin Hypercube Sampling.
6. the numerical method of quick determination drop stamping production line process parameter according to claims 1 to 4, it is characterised in that
Mapping relations of setting up described in step S6 are to set up mapping relations using RBF alternative models.
7. the numerical method of quick determination drop stamping production line process parameter according to claims 1 to 4, it is characterised in that
Technological parameter reference value when obtaining index parameter optimization described in step S7 is to be obtained using multi-objective genetic algorithm optimization
Technological parameter reference value during index parameter optimization.
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Application publication date: 20170315 |