CN105373674A - Method and device for optimizing inner cavity structure of protective glass - Google Patents
Method and device for optimizing inner cavity structure of protective glass Download PDFInfo
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- CN105373674A CN105373674A CN201510896756.3A CN201510896756A CN105373674A CN 105373674 A CN105373674 A CN 105373674A CN 201510896756 A CN201510896756 A CN 201510896756A CN 105373674 A CN105373674 A CN 105373674A
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Abstract
The invention relates to a method for optimizing an inner cavity structure of a protective glass. The method comprises the following steps: obtaining a flow field space model of a cutting gas in an inner cavity of the protective glass; building a fluid dynamics analysis model of the cutting gas by the flow field space model; calculating the fluid dynamics analysis model and obtaining corresponding flow field parameter and airflow image; if the flow field parameter and the airflow image do not meet the preset requirements, improving the structure of the inner cavity of the protective glass, and obtaining the improved inner cavity of the protective glass; calculating the improved inner cavity of the protective glass again until the flow field parameter and the airflow image of meeting the preset requirements are obtained, and determining the improved inner cavity structure of the protective glass with the flow field parameter and the airflow image of meeting the preset requirements to be the optimized inner cavity structure of the protective glass. By the method, time and labor can be saved; and quantitative analysis can be carried out. In addition, the invention further provides a device for optimizing the inner cavity structure of the protective glass.
Description
Technical field
The present invention relates to technical field of laser processing, particularly relate to a kind of protective glass inner-cavity structure optimization method and device.
Background technology
In laser cutting parameter, the good cutting section quality of slab sheet material is the difficult point in processing technology.Wherein, the cutting section quality of cutting gas on slab sheet material has important impact.And laser head protective glass (hereinafter referred to as protective glass) inner-cavity structure is as the transmission channel of cutting gas, material impact can be produced to the characteristic of cutting gas again.Therefore, protective glass inner-cavity structure reasonable in design is needed could effectively to ensure cutting section quality.The mode traditional to the design of protective glass inner-cavity structure adopts trial and error, namely by obtaining good design proposal after amendment design repeatedly and actual measurement circulation.This method wastes time and energy, and is difficult to carry out determining quantitative analysis.
Summary of the invention
Based on this, be necessary for above-mentioned technical matters, provide a kind of can be time saving and energy saving and protective glass inner-cavity structure optimization method and the device of quantitative test can be carried out.
A kind of protective glass inner-cavity structure optimization method, described method comprises:
Obtain the flow field spatial model of cutting gas in protective glass inner chamber;
Described flow field spatial model is utilized to set up the hydrodynamic analysis model of described cutting gas;
Described hydrodynamic analysis model is calculated, obtains the gentle stream picture of corresponding flow field parameter;
If the gentle stream picture of described flow field parameter does not meet preset requirement; then the structure of described protective glass inner chamber is improved; protective glass inner chamber after being improved; again the protective glass inner chamber after improving is calculated until the gentle stream picture of flow field parameter that is met preset requirement, the protective glass inner-cavity structure after the improvement of gentle for the flow field parameter meeting preset requirement stream picture is defined as the protective glass inner-cavity structure after optimizing.
Wherein in an embodiment, the described step utilizing described flow field spatial model to set up the hydrodynamic analysis model of described cutting gas comprises:
Described flow field spatial model divides hydrodynamic analysis grid;
Utilize the material properties of described hydrodynamic analysis mesh definition cutting gas;
Define multiple model parameter and the pressure boundary condition of described hydrodynamic analysis model.
Wherein in an embodiment, described flow field parameter comprises mass flowrate, describedly comprises the step that described hydrodynamic analysis model calculates the gentle stream picture of corresponding flow field parameter:
Described hydrodynamic analysis model is calculated, until the convergence of described hydrodynamic analysis model;
Extract multiple flux map pictures of mass flowrate and cutting gas respectively.
Wherein in an embodiment; described flux map picture comprises at least one item in air-flow trace diagram, Velocity Profiles figure, current density distribution plan; wherein; Velocity Profiles figure comprises the Velocity Profiles figure of square section and the Velocity Profiles figure in cross section, protective glass inner chamber gas outlet under protective glass inner chamber, and current density distribution plan comprises the current density distribution plan of square section and the current density distribution plan in cross section, protective glass inner chamber gas outlet under protective glass inner chamber.
Wherein in an embodiment, after the step of the protective glass inner chamber after described being improved, also comprise:
Utilize the protective glass inner chamber after improving to repeat the step of the flow field spatial model of cutting gas in described acquisition protective glass inner chamber, calculate the flow field parameter after improvement and the flux map picture after improving;
Flow field parameter after improvement and the flow field parameter before improving are compared, and the flux map picture before the flux map picture after improvement and improvement is compared;
If the flow field parameter after improving is greater than the flow field parameter before improvement, and air flow method in flux map picture after improving is more more even than the air flow method in the flux map picture before improving, then represent that the protective glass inner-cavity structure after improvement is closer to preset requirement.
A kind of protective glass inner-cavity structure optimization device, described device comprises:
Acquisition module, for obtaining the flow field spatial model of cutting gas in protective glass inner chamber;
MBM, for the hydrodynamic analysis model utilizing described flow field spatial model to set up described cutting gas;
Computing module, for calculating described hydrodynamic analysis model, obtains the gentle stream picture of corresponding flow field parameter;
Optimize module; if do not meet preset requirement for the gentle stream picture of described flow field parameter; then the structure of described protective glass inner chamber is improved; protective glass inner chamber after being improved; again the protective glass inner chamber after improving is calculated until the gentle stream picture of flow field parameter that is met preset requirement, the protective glass inner-cavity structure after the improvement of gentle for the flow field parameter meeting preset requirement stream picture is defined as the protective glass inner-cavity structure after optimizing.
Wherein in an embodiment, described MBM also for dividing hydrodynamic analysis grid on the spatial model of described flow field; Utilize the material properties of described hydrodynamic analysis mesh definition cutting gas; Define multiple model parameter and the pressure boundary condition of described hydrodynamic analysis model.
Wherein in an embodiment, described flow field parameter comprises mass flowrate, and described computing module is also for calculating described hydrodynamic analysis model, until the convergence of described hydrodynamic analysis model; Extract multiple flux map pictures of mass flowrate and cutting gas respectively.
Wherein in an embodiment; described flux map picture comprises at least one item in air-flow trace diagram, Velocity Profiles figure, current density distribution plan; wherein; Velocity Profiles figure comprises the Velocity Profiles figure of square section and the Velocity Profiles figure in cross section, protective glass inner chamber gas outlet under protective glass inner chamber, and current density distribution plan comprises the current density distribution plan of square section and the current density distribution plan in cross section, protective glass inner chamber gas outlet under protective glass inner chamber.
Wherein in an embodiment, the step of described computing module also for utilizing the protective glass inner chamber after improvement to repeat the flow field spatial model of cutting gas in described acquisition protective glass inner chamber, calculates the flow field parameter after improvement and the flux map picture after improving;
Flux map picture before flux map picture after improvement and improvement also for the flow field parameter after improvement and the flow field parameter before improving being compared, and compares by described optimization module; If the flow field parameter after improving is greater than the flow field parameter before improvement, and air flow method in flux map picture after improving is more more even than the air flow method in the flux map picture before improving, then represent that the protective glass inner-cavity structure after improvement is closer to preset requirement.Above-mentioned protective glass inner-cavity structure optimization method and device, by obtaining the flow field spatial model of cutting gas in protective glass inner chamber, utilize described flow field spatial model to set up the hydrodynamic analysis model of described cutting gas with this; Described hydrodynamic analysis model is calculated, obtains the gentle stream picture of corresponding flow field parameter.By flow field parameter gentle stream picture, quantitative test is carried out to the structure of protective glass inner chamber; if the gentle stream picture of described flow field parameter does not meet preset requirement; then the structure of described protective glass inner chamber is improved; protective glass inner chamber after being improved; again the protective glass inner chamber after improving is calculated until the gentle stream picture of flow field parameter that is met preset requirement, the protective glass inner-cavity structure after the improvement of gentle for the flow field parameter meeting preset requirement stream picture is defined as the protective glass inner-cavity structure after optimizing.Quantitative test can be carried out by the hydrodynamic analysis model of cutting gas to the protective glass inner-cavity structure after improving thus, avoid trial-production blindly and test, can be time saving and energy saving be optimized after protective glass inner-cavity structure.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of protective glass inner-cavity structure optimization method in an embodiment;
Fig. 2 is the structural representation of protective glass inner chamber in an embodiment;
Fig. 3 is the schematic diagram of the flow field spatial model of cutting gas in an embodiment;
Fig. 4 is the schematic diagram of hydrodynamic analysis grid in an embodiment;
Fig. 5 is the structural representation of the protective glass inner chamber after adding the improvement guiding gas distribution structure in an embodiment;
Fig. 6 is the air-flow trace diagram before improving in an embodiment;
Fig. 7 is the air-flow trace diagram after improving in an embodiment;
Fig. 8 is the lower square section velocity profile before improving in an embodiment;
Fig. 9 is the lower square section velocity profile after improving in an embodiment;
Figure 10 is cross section, the gas outlet velocity profile before improving in an embodiment;
Figure 11 is the current density distribution plan before improving in an embodiment;
Figure 12 is cross section, the gas outlet velocity profile after improving in an embodiment;
Figure 13 is the current density distribution plan after improving in an embodiment;
Figure 14 is the cutting section figure before improving in an embodiment;
Figure 15 is the cutting section figure after improving in an embodiment;
Figure 16 is the structural representation of protective glass inner-cavity structure optimization device in an embodiment.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In one embodiment, as shown in Figure 1, provide a kind of protective glass inner-cavity structure optimization method, the method comprises:
Step 102, obtains the flow field spatial model of cutting gas in protective glass inner chamber.
Protective glass inner chamber and laser head protective glass inner chamber, as shown in Figure 2, protective glass 202 is positioned at the top of protective glass cavity of resorption 204 to structural representation, and protective glass cavity of resorption 204 is connected with outlet passageway 208 by connection chamber 206.Cutting head 210 is also provided with at the end of outlet passageway 208.The sidewall of connection chamber 206 offers air intake opening, and the sidewall that inlet channel 212 surrounds air intake opening with connection chamber 206 is connected.Wherein, inlet channel 212 can have multiple.Outlet passageway 208 is taper.
Obtain the Three Dimensional Design Model of protective glass inner-cavity structure, utilize this Three Dimensional Design Model to extract the flow field spatial model of cutting gas in protective glass inner chamber.Concrete, extract the flow field spatial model of the space in the Three Dimensional Design Model of protective glass inner-cavity structure as cutting gas in protective glass inner chamber.
Cutting gas refers to the gas for cutting sheet material, such as, and nitrogen.The flow field spatial model of cutting gas as shown in Figure 3, comprising protective glass cavity of resorption 302, inlet channel 304 and outlet passageway 306.Inlet channel is provided with air intake opening 308, and outlet passageway is provided with gas outlet 310.Space, flow field must be a closed solid.
Step 104, utilizes flow field spatial model to set up the hydrodynamic analysis model of cutting gas.
Dynamic analysis is carried out to the flow field spatial model of the cutting gas extracted.In one embodiment, the step utilizing described flow field spatial model to set up the hydrodynamic analysis model of described cutting gas comprises: on the spatial model of described flow field, divide hydrodynamic analysis grid; Utilize the material properties of described hydrodynamic analysis mesh definition cutting gas; Define multiple model parameter and the pressure boundary condition of described hydrodynamic analysis model.
Gas dynamics analysis software can be utilized to set up the hydrodynamic analysis model of cutting gas.Flow field spatial model divides hydrodynamic analysis grid, and the schematic diagram of hydrodynamic analysis grid as shown in Figure 4.Utilize ready-portioned hydrodynamic analysis grid to define the material properties of cutting gas.Material properties comprises packed attribute, density, heat-conduction coefficient, specific heat and viscosity etc.Take cutting gas as nitrogen be example, the material properties of definition cutting gas is as follows: density: 1.138Kg/m
3(kilograms per cubic meter), heat-conduction coefficient: 0.0242W/mK (watt/ meter Du), specific heat: 1040.67J/KgK (burnt/kilogram open), viscosity: 1.663 × 10
-5kg/ms (kg/m second).
Hydrodynamic analysis model also comprises multiple model parameter, comprises Name-based Routing, steady-state model, turbulence model and energy model etc.After the material properties defining cutting gas, also need the multiple model parameters defining hydrodynamic analysis model.Concrete, utilize gas dynamics analysis software convection cell dynamic analysis model to define Name-based Routing, define steady-state model, define turbulence model and open energy model etc.Wherein in an embodiment, the turbulence model of convection cell dynamic analysis model is defined as k-ε turbulence model.
Further, the pressure boundary condition of convection cell dynamic analysis model defines.In one embodiment, pressure boundary condition comprises inlet pressure boundary condition, gas outlet pressure boundary condition and wall boundary condition.Wherein, inlet pressure boundary condition refers to the face at air intake opening place, and gas outlet pressure boundary condition refers to the face at place, gas outlet, and wall boundary condition refers to the face except air intake opening and gas outlet.Inlet pressure boundary condition is defined, the force value of air intake opening can be defined.The force value of air intake opening is the air inlet pressure force value of laser head cutting gas, can be tested obtain by barometer.Such as, the force value of air intake opening is 10.65atm (atmosphere writes a Chinese character in simplified form, standard atmospheric pressure).Gas outlet pressure boundary condition is defined, the force value of gas port can be defined.The force value of gas outlet is the force value of laser head cutting gas in cutting head inflow point, can be tested obtain by barometer.Such as, the force value of gas outlet is 9.15atm.
Step 106, convection cell dynamic analysis model calculates, and obtains the gentle stream picture of corresponding flow field parameter.
Gas dynamics analysis software can be utilized to carry out convection cell dynamic analysis model calculate.In one embodiment, flow field parameter comprises mass flowrate, described the step that described hydrodynamic analysis model calculates the gentle stream picture of corresponding flow field parameter to be comprised: described hydrodynamic analysis model is calculated, until the convergence of described hydrodynamic analysis model; Extract multiple flux map pictures of mass flowrate and cutting gas respectively.
In gas dynamics analysis software, submit hydrodynamic analysis model to, and convection cell dynamic analysis model calculates, until the convergence of described hydrodynamic analysis model.The convergence of hydrodynamic analysis model also just means that the convergence of hydrodynamic analysis model reaches default accuracy requirement.Extract the flow field parameter of protective glass inner-cavity structure internal cutting gas.Wherein, flow field parameter comprises mass flowrate.If mass flowrate is little, then represent that the vapour lock of protective glass inner-cavity structure is high, namely the energy loss of cutting gas is large, is unfavorable for cutting.
In one embodiment, flux map picture comprises at least one item in air-flow trace diagram, Velocity Profiles figure, current density distribution plan.In order to improve the accuracy that convection cell dynamic analysis model is analyzed, Velocity Profiles figure and current density distribution plan are not arbitrarily extract, but have certain status requirement.Wherein, Velocity Profiles figure comprises the Velocity Profiles figure of square section and the Velocity Profiles figure in cross section, protective glass inner chamber gas outlet under protective glass inner chamber.Under protective glass inner chamber, square section refers to the cross section that distance protection mirror lower surface predeterminable range goes out, and this cross section is generally between protective glass lower surface and inlet channel place plane.Cross sectional shape can be circular, and predeterminable range can be 4mm.Current density distribution plan can be the current density distribution plan of square section under protective glass inner chamber, also can be the current density distribution plan in cross section, protective glass inner chamber gas outlet.
The whirlpool of the gas streamline in air-flow trace diagram reduces, then represent that the ride comfort of air-flow can improve.Velocity Profiles in Velocity Profiles figure evenly, then represent the velocity field of air-flow evenly.Current density in current density distribution plan is more evenly distributed, then represent the density field of air-flow evenly, be more conducive to improve cutting section quality.
Step 108; if the gentle stream picture of described flow field parameter does not meet preset requirement; then the structure of protective glass inner chamber is improved; protective glass inner chamber after being improved; again the protective glass inner chamber after improving is calculated until the gentle stream picture of flow field parameter that is met preset requirement, the protective glass inner-cavity structure after the improvement of gentle for the flow field parameter meeting preset requirement stream picture is defined as the protective glass inner-cavity structure after optimizing.
If the gentle stream picture of process parameter does not meet preset requirement, then need to improve the structure of protective glass inner chamber.Multiple improved procedure can be had to the structure of protective glass inner chamber, such as, increase in the inside of protective glass inner chamber and guide gas distribution structure, increase the tapering of protective glass inner chamber outlet passageway and increase the height etc. of protective glass cavity of resorption.
Protective glass inner chamber after improvement is repeated to the step of the flow field spatial model obtaining cutting gas in protective glass inner chamber; namely obtain the flow field spatial model of the cutting gas in the protective glass inner chamber after improving; hydrodynamic analysis model after utilizing the flow field spatial model after improving to set up the improvement of cutting gas; hydrodynamic analysis model after improving is calculated, the flow field parameter after being improved and the flux map picture after improving.Flow field parameter after improvement and the flow field parameter before improving are compared; and the flux map picture after improvement and the flux map picture before improving are compared; be met the gentle stream picture of flow field parameter of preset requirement, the protective glass inner-cavity structure after the improvement of gentle for the flow field parameter meeting preset requirement stream picture be defined as the protective glass inner-cavity structure after optimizing.
Further, preset requirement can change according to actual needs, and protective glass inner-cavity structure also can through repeatedly improving.Before protective glass inner chamber through repeatedly improving is improved next time again, the protective glass inner chamber before improving can also be referred to as.
In the present embodiment, by obtaining the flow field spatial model of cutting gas in protective glass inner chamber, described flow field spatial model is utilized to set up the hydrodynamic analysis model of described cutting gas with this; Described hydrodynamic analysis model is calculated, obtains the gentle stream picture of corresponding flow field parameter.By flow field parameter gentle stream picture, quantitative test is carried out to the structure of protective glass inner chamber; if the gentle stream picture of described flow field parameter does not meet preset requirement; then the structure of described protective glass inner chamber is improved; protective glass inner chamber after being improved; again the protective glass inner chamber after improving is calculated until the gentle stream picture of flow field parameter that is met preset requirement, the protective glass inner-cavity structure after the improvement of gentle for the flow field parameter meeting preset requirement stream picture is defined as the protective glass inner-cavity structure after optimizing.Quantitative test can be carried out by the hydrodynamic analysis model of cutting gas to the protective glass inner-cavity structure after improving thus, avoid trial-production blindly and test, can be time saving and energy saving be optimized after protective glass inner-cavity structure.
In one embodiment, after the step of the protective glass inner chamber after described being improved, also comprise: utilize the protective glass inner chamber after improving to repeat the step of the flow field spatial model of cutting gas in described acquisition protective glass inner chamber, calculate the flow field parameter after improvement and the flux map picture after improving; Flow field parameter after improvement and the flow field parameter before improving are compared, and the flux map picture before the flux map picture after improvement and improvement is compared; If the flow field parameter after improving is greater than the flow field parameter before improvement, and air flow method in flux map picture after improving is more more even than the air flow method in the flux map picture before improving, then represent that the protective glass inner-cavity structure after improvement is closer to preset requirement.
In the present embodiment; protective glass inner chamber after improvement is repeated to the step of the flow field spatial model obtaining cutting gas in protective glass inner chamber; namely obtain the flow field spatial model of the cutting gas in the protective glass inner chamber after improving; hydrodynamic analysis model after utilizing the flow field spatial model after improving to set up the improvement of cutting gas; hydrodynamic analysis model after improving is calculated, the flow field parameter after being improved and the flux map picture after improving.
Flow field parameter after improvement and the flow field parameter before improving are compared, and the flux map picture before the flux map picture after improvement and improvement is compared; If the flow field parameter after improving is greater than the flow field parameter before improvement, and air flow method in flux map picture after improving is more more even than the air flow method in the flux map picture before improving, then represent that the protective glass inner-cavity structure after improvement is closer to preset requirement.
Flow field parameter comprises mass flowrate.If the mass flowrate after improving is larger than the mass flowrate before improvement, then represent that the vapour lock of protective glass inner-cavity structure is little, namely the capacity loss of cutting gas is little, is more conducive to cutting.
Gas streamline in air-flow trace diagram after improvement is compared with the gas streamline in the air-flow trace diagram before improving, and whirlpool reduces, then represent in the protective glass inner chamber after improving and mention at the ride comfort of outlet passageway air-flow.Gas velocity in Velocity Profiles figure after improvement and improve before Velocity Profiles figure in gas velocity to comparing, be more evenly distributed, then represent improve after protective glass inner chamber in air-flow velocity field evenly.Current density in current density in current density distribution plan after improvement and the current density distribution plan before improving, to comparing, is more evenly distributed, then represent the density field of the air-flow in the protective glass inner chamber after improving evenly, be more conducive to improve cutting section quality.
With the protective glass inner chamber that the protective glass inner chamber before improving is initial designs, the protective glass inner chamber after improvement guides gas distribution structure to be that example is described for adding.With addition of the structure of the protective glass inner chamber after the improvement guiding gas distribution structure 214 as shown in Figure 5.
Mass flowrate (being called for short the mass flowrate before the improving) Q of the protective glass inner chamber before improvement
m0=0.061Kg/s (Kilograms Per Second), mass flowrate (being called for short the mass flowrate after the improving) Q of the protective glass inner chamber after improvement
m1=0.069Kg/s, the mass flowrate after improvement is higher than the mass flowrate before improvement, and illustrate that in the structure of the protective glass inner chamber after improving, vapour lock is less, namely the energy loss of cutting gas is less, is more conducive to cutting.
As shown in Figure 6, the air trajectory line of cutting gas is mixed and disorderly, and gas streamline develops under the inside of protective glass inner chamber helically alignment for the air-flow trace diagram (being called for short the air-flow trace diagram before improving) of the protective glass inner chamber before improvement.In this, gas streamline can cause the flow field of cutting gas unstable.In practical laser cutting process, be easily subject to extraneous interference change, thus affect the transmission of laser optical path.The air-flow trace diagram (being called for short the air-flow trace diagram after improving) of the protective glass inner chamber after improvement as shown in Figure 7.The whirlpool of the gas streamline of the protective glass inner chamber after improvement obviously reduces, and be flat substantially at outlet passageway air-flow, ride comfort significantly improves.
The velocity profile (being called for short the lower square section velocity profile before improving) of square section under protective glass inner chamber before improvement; as shown in Figure 8; the gas velocity in portion is maximum in cross section; gas velocity near cylindrical is less, and the velocity uniformity that air-flow enters behind inside, protective glass chamber from inlet channel is poor.The velocity profile (being called for short the lower square section velocity profile after improving) of square section under protective glass inner chamber after improvement; as shown in Figure 9; owing to guiding the shunting action of gas distribution structure in the protective glass inner-cavity structure after improvement, the Velocity Profiles near protective glass lower surface is more even.
The velocity profile (being called for short cross section, the gas outlet velocity profile before improving) in the cross section, protective glass inner chamber gas outlet before improvement; as shown in Figure 10; the current density distribution plan (being called for short the current density distribution plan before improving) in the cross section, protective glass inner chamber gas outlet before improvement; as shown in figure 11; the speed of air-flow in exit of cutting gas, Density Distribution are eccentric, skewness.Because air-flow out will enter cutting head afterwards from this outlet, if the air-flow of this outlet is uneven, will the flow field of cutting head be affected, finally affect cutting effect.The velocity profile (being called for short cross section, the gas outlet velocity profile after improving) in the cross section, protective glass inner chamber gas outlet after improvement; as shown in figure 12; the density profile (being called for short the current density distribution plan after improving) in the cross section, protective glass inner chamber gas outlet after improvement; as shown in figure 13, cross section, the protective glass inner-cavity structure gas outlet velocity distribution after improvement, Density Distribution are more even.
By analyzing the protective glass inner-cavity structure before improvement, the streamline of its air-flow is chaotic, and velocity field, density field distribution are uneven.From the cutting effect of reality, light path is unstable, and cutting section effect is poor.Thickness be 10mm stainless steel material cutting section as shown in figure 14, section is coarse and have obvious layering.
By analyzing the protective glass inner-cavity structure after improvement, the whirlpool of its air-flow streamline reduces, and ride comfort significantly improves, and velocity field, the density field of air-flow are more even, are more conducive to improving cutting section quality.Contrast through actual cutting experiment, under identical cutting technique parameter, when adopting the laser head cutting of the protective glass inner-cavity structure after improving, light path is more stable, and workpiece cross section quality is better.As shown in figure 15, for thickness is 10mm stainless steel material cutting section, section is smooth, and cross section quality significantly improves.
In one embodiment, as shown in figure 16, provide a kind of protective glass inner-cavity structure optimization device, this device comprises: acquisition module 1602, MBM 1604, computing module 1606 and optimization module 1608, wherein:
Acquisition module 1602, for obtaining the flow field spatial model of cutting gas in protective glass inner chamber.
MBM 1604, for the hydrodynamic analysis model utilizing described flow field spatial model to set up described cutting gas.
Computing module 1606, for calculating described hydrodynamic analysis model, obtains the gentle stream picture of corresponding flow field parameter.
Optimize module 1608; if do not meet preset requirement for the gentle stream picture of described flow field parameter; then the structure of described protective glass inner chamber is improved; protective glass inner chamber after being improved; again the protective glass inner chamber after improving is calculated until the gentle stream picture of flow field parameter that is met preset requirement, the protective glass inner-cavity structure after the improvement of gentle for the flow field parameter meeting preset requirement stream picture is defined as the protective glass inner-cavity structure after optimizing.
In one embodiment, MBM 1604 also for dividing hydrodynamic analysis grid on the spatial model of described flow field; Utilize the material properties of described hydrodynamic analysis mesh definition cutting gas; Define multiple model parameter and the pressure boundary condition of described hydrodynamic analysis model.
In one embodiment, flow field parameter comprises mass flowrate, and described computing module 1606 is also for calculating described hydrodynamic analysis model, until the convergence of described hydrodynamic analysis model; Extract multiple flux map pictures of mass flowrate and cutting gas respectively.
In one embodiment; described flux map picture comprises at least one item in air-flow trace diagram, Velocity Profiles figure, current density distribution plan; wherein; Velocity Profiles figure comprises the Velocity Profiles figure of square section and the Velocity Profiles figure in cross section, protective glass inner chamber gas outlet under protective glass inner chamber, and current density distribution plan comprises the current density distribution plan of square section and the current density distribution plan in cross section, protective glass inner chamber gas outlet under protective glass inner chamber.
In one embodiment, the step of described computing module 1606 also for utilizing the protective glass inner chamber after improvement to repeat the flow field spatial model of cutting gas in described acquisition protective glass inner chamber, calculates the flow field parameter after improvement and the flux map picture after improving; Flux map picture before flux map picture after improvement and improvement also for the flow field parameter after improvement and the flow field parameter before improving being compared, and compares by described optimization module 1608; If the flow field parameter after improving is greater than the flow field parameter before improvement, and air flow method in flux map picture after improving is more more even than the air flow method in the flux map picture before improving, then represent that the protective glass inner-cavity structure after improvement is closer to preset requirement.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this instructions is recorded.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a protective glass inner-cavity structure optimization method, described method comprises:
Obtain the flow field spatial model of cutting gas in protective glass inner chamber;
Described flow field spatial model is utilized to set up the hydrodynamic analysis model of described cutting gas;
Described hydrodynamic analysis model is calculated, obtains the gentle stream picture of corresponding flow field parameter;
If the gentle stream picture of described flow field parameter does not meet preset requirement; then the structure of described protective glass inner chamber is improved; protective glass inner chamber after being improved; again the protective glass inner chamber after improving is calculated until the gentle stream picture of flow field parameter that is met preset requirement, the protective glass inner-cavity structure after the improvement of gentle for the flow field parameter meeting preset requirement stream picture is defined as the protective glass inner-cavity structure after optimizing.
2. method according to claim 1, is characterized in that, the described step utilizing described flow field spatial model to set up the hydrodynamic analysis model of described cutting gas comprises:
Described flow field spatial model divides hydrodynamic analysis grid;
Utilize the material properties of described hydrodynamic analysis mesh definition cutting gas;
Define multiple model parameter and the pressure boundary condition of described hydrodynamic analysis model.
3. method according to claim 1, is characterized in that, described flow field parameter comprises mass flowrate, describedly comprises the step that described hydrodynamic analysis model calculates the gentle stream picture of corresponding flow field parameter:
Described hydrodynamic analysis model is calculated, until the convergence of described hydrodynamic analysis model;
Extract multiple flux map pictures of mass flowrate and cutting gas respectively.
4. method according to claim 3; it is characterized in that; described flux map picture comprises at least one item in air-flow trace diagram, Velocity Profiles figure, current density distribution plan; wherein; Velocity Profiles figure comprises the Velocity Profiles figure of square section and the Velocity Profiles figure in cross section, protective glass inner chamber gas outlet under protective glass inner chamber, and current density distribution plan comprises the current density distribution plan of square section and the current density distribution plan in cross section, protective glass inner chamber gas outlet under protective glass inner chamber.
5. method according to claim 1, is characterized in that, after the step of the protective glass inner chamber after described being improved, also comprises:
Utilize the protective glass inner chamber after improving to repeat the step of the flow field spatial model of cutting gas in described acquisition protective glass inner chamber, calculate the flow field parameter after improvement and the flux map picture after improving;
Flow field parameter after improvement and the flow field parameter before improving are compared, and the flux map picture before the flux map picture after improvement and improvement is compared;
If the flow field parameter after improving is greater than the flow field parameter before improvement, and air flow method in flux map picture after improving is more more even than the air flow method in the flux map picture before improving, then represent that the protective glass inner-cavity structure after improvement is closer to preset requirement.
6. a protective glass inner-cavity structure optimization device, is characterized in that, described device comprises:
Acquisition module, for obtaining the flow field spatial model of cutting gas in protective glass inner chamber;
MBM, for the hydrodynamic analysis model utilizing described flow field spatial model to set up described cutting gas;
Computing module, for calculating described hydrodynamic analysis model, obtains the gentle stream picture of corresponding flow field parameter;
Optimize module; if do not meet preset requirement for the gentle stream picture of described flow field parameter; then the structure of described protective glass inner chamber is improved; protective glass inner chamber after being improved; again the protective glass inner chamber after improving is calculated until the gentle stream picture of flow field parameter that is met preset requirement, the protective glass inner-cavity structure after the improvement of gentle for the flow field parameter meeting preset requirement stream picture is defined as the protective glass inner-cavity structure after optimizing.
7. device according to claim 6, is characterized in that, described MBM also for dividing hydrodynamic analysis grid on the spatial model of described flow field; Utilize the material properties of described hydrodynamic analysis mesh definition cutting gas; Define multiple model parameter and the pressure boundary condition of described hydrodynamic analysis model.
8. device according to claim 6, is characterized in that, described flow field parameter comprises mass flowrate, and described computing module is also for calculating described hydrodynamic analysis model, until the convergence of described hydrodynamic analysis model; Extract multiple flux map pictures of mass flowrate and cutting gas respectively.
9. device according to claim 8; it is characterized in that; described flux map picture comprises at least one item in air-flow trace diagram, Velocity Profiles figure, current density distribution plan; wherein; Velocity Profiles figure comprises the Velocity Profiles figure of square section and the Velocity Profiles figure in cross section, protective glass inner chamber gas outlet under protective glass inner chamber, and current density distribution plan comprises the current density distribution plan of square section and the current density distribution plan in cross section, protective glass inner chamber gas outlet under protective glass inner chamber.
10. device according to claim 6, it is characterized in that, the step of described computing module also for utilizing the protective glass inner chamber after improvement to repeat the flow field spatial model of cutting gas in described acquisition protective glass inner chamber, calculates the flow field parameter after improvement and the flux map picture after improving;
Flux map picture before flux map picture after improvement and improvement also for the flow field parameter after improvement and the flow field parameter before improving being compared, and compares by described optimization module; If the flow field parameter after improving is greater than the flow field parameter before improvement, and air flow method in flux map picture after improving is more more even than the air flow method in the flux map picture before improving, then represent that the protective glass inner-cavity structure after improvement is closer to preset requirement.
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