CN105522283A - Control method, device and system based on laser cutting parameters of temperature field - Google Patents

Abstract

The invention provides a control method, device and system based on laser cutting parameters of a temperature field, and relates to the field of laser cutting technologies. The method includes the steps that cutting zone temperature field distribution data are obtained through an infrared thermography system, and temperature values of all temperature points in the temperature field are determined according to the cutting zone temperature field distribution data; control strategies of the laser cutting parameters are determined according to the temperature values of all temperature points in the temperature field; and the laser cutting parameters are controlled according to the control strategies of the laser cutting parameters, so that a laser cutting device cuts a to-be-cut workpiece according to the laser cutting parameters. By means of the control method, device and system, the problems that the current laser cutting parameters only depend on manual setting by a laser cutting operator according to experience, so that differences of all points in a cutting path are large, the consistency of the notch quality is difficult to achieve, and the workpiece is prone to being poor in quality or being scrapped can be solved.

Description

A kind of control method, Apparatus and system of the parameters of laser cutting based on temperature field

Technical field

The present invention relates to laser cutting technique field, particularly relate to a kind of control method, Apparatus and system of the parameters of laser cutting based on temperature field.

Background technology

Current, laser cutting utilizes the high power density laser bundle of line focus to irradiate workpiece, the material at illuminated place immediately melted, gasification, ablation or reach burning-point, borrow the high velocity air coaxial with light beam to blow down melt substance simultaneously, thus realize a kind of method for hot cutting cutting open workpiece.Laser cutting technique due to its cutting speed fast, heat affected area is little, workpiece deformation is little, light beam noninertia, the advantage such as practicable high-speed cutting, kerf edge perpendicularity are good, be widely used in work piece cut field, it has become one of the conventional means of various metal, non-metal workpiece processing.

In existing main flow laser cutting device, what can control or select be divided into two classes to the influential parameter of cutting result, one class is the intrinsic parameter of equipment, comprise optical maser wavelength, beam mode, output mode (continuously or pulse etc.), focal beam spot diameter and Energy distribution thereof etc., this type of factor is generally along with purchasing of laser equipment is determined substantially.Another kind of is adding selectable parameter in man-hour, and comprise the spacing etc. of laser power, cutting speed, focal position, assist gas kind and pressure, nozzle and workpiece, these parameters have conclusive impact equally on cut quality.

Can be at present pre-set these parameters in procedure to these selectable parameter adjustment control methods, and these parameter values general rule of thumb or pre-stage test obtain.In part process, these parameters rule of thumb manually can only be adjusted by operator.But, when large complicated space three-dimensional part laser cutting, in cutting path, each point otherness is large, operator is adopted rule of thumb manually to adjust cutting parameter, be difficult to the uniformity realizing kerf quality, cause kerf width, particularly the increase of remelted layer and heat affected area thickness, even cause ablated surface time serious or do not cut, part may be caused overproof and scrap in without the precision cutting of surplus.

Summary of the invention

Embodiments of the invention provide a kind of control method, Apparatus and system of the parameters of laser cutting based on temperature field, only rely on laser cutting operation to solve current parameters of laser cutting person rule of thumb manually adjusts, cause each point otherness in cutting path large, be difficult to the uniformity realizing kerf quality, easily make the problem that workpiece quality is poor or scrap.

For achieving the above object, the present invention adopts following technical scheme:

Based on a control method for the parameters of laser cutting in temperature field, comprising:

Obtain cutting zone thermo parameters method data by infrared thermal imagery system, and determine the temperature value of each temperature spot in described temperature field according to described thermo parameters method data;

According to the control strategy of the temperature value determination parameters of laser cutting of temperature spot each in described temperature field;

Control described parameters of laser cutting according to the control strategy of described parameters of laser cutting, cut workpiece to be cut to make laser cutter according to described parameters of laser cutting.

Concrete, described infrared thermal imagery system comprises the first infrared camera and the second infrared camera that are distributed in laser cutter both sides;

Described by infrared thermal imagery system acquisition cutting zone thermo parameters method data, and the temperature value of each temperature spot in described temperature field is determined according to described thermo parameters method data, comprising:

Gather cutting zone thermo parameters method data by described first infrared camera, and determine the first temperature value of each temperature spot in described temperature field;

Gather cutting zone thermo parameters method data by described second infrared camera, and determine the second temperature value of each temperature spot in described temperature field;

First temperature value of temperature spot each in described temperature field and the second temperature value are compared, chooses the higher value among the first temperature value of each temperature spot and the second temperature value, using the temperature value of described higher value as described temperature spot.

Concrete, according to the control strategy of the temperature value determination parameters of laser cutting of temperature spot each in described temperature field, comprising:

If N _minT1<N _t1<N _maxT1, determine that described control strategy is described parameters of laser cutting without the need to adjustment, maintain current parameters of laser cutting; Wherein, N _t1for the temperature value of temperature spot each in described temperature field is greater than T ₁the number of temperature, N _minT1be a first temperature spot amount threshold pre-set, N _maxT1it is a second temperature spot amount threshold pre-set.

Further, according to the control strategy of the temperature value determination parameters of laser cutting of temperature spot each in described temperature field, also comprise:

If N _t1>=N _maxT1, and N _t2>=N _maxT2, determine that described control strategy is that laser cutting process is abnormal, stop treating cut workpiece cutting; Wherein, N _t2for the temperature value of temperature spot each in described temperature field is greater than T ₂the number of temperature, T ₂>T ₁, N _maxT2it is a 3rd temperature spot amount threshold pre-set;

If N _t1>=N _maxT1, and N _t2<N _maxT2, N _t3<N _maxT3, determine that described control strategy is the laser power in parameters of laser cutting be reduced to the first preset percentage of present laser power or the cutting speed in parameters of laser cutting be increased to the second preset percentage of current cutting speed; Wherein, N _t3for the temperature value of temperature spot each in described temperature field is greater than T ₃the number of temperature, T ₃<T ₁, N _maxT3it is a 4th temperature spot amount threshold pre-set;

If N _t1>=N _maxT1, and N _t2<N _maxT2, N _t3>=N _maxT3, determine that described control strategy is the laser power in parameters of laser cutting be increased to the 3rd preset percentage of present laser power or the cutting speed in parameters of laser cutting be reduced to the 4th preset percentage of current cutting speed.

Further, according to the control strategy of the temperature value determination parameters of laser cutting of temperature spot each in described temperature field, also comprise:

If N _t1≤ N _minT1, determine that described control strategy is that laser cutting process is abnormal, stop treating cut workpiece cutting.

In addition, after obtaining cutting zone thermo parameters method data by infrared thermal imagery system, comprising:

The unascertained information of the results change of cutting zone thermo parameters method data is obtained according to infrared thermal imagery system, and the time lag information that cutting zone thermo parameters method data are transmitted between laser cutting control apparatus to laser cutter, determine the maximum allowable variation scope of cutting zone thermo parameters method data;

Cutting zone thermo parameters method data outside described maximum allowable variation scope are rejected, and obtains the cutting zone thermo parameters method data within described maximum allowable variation scope.

Concrete, the unascertained information of the results change of cutting zone thermo parameters method data is obtained according to infrared thermal imagery system, and the time lag information that cutting zone thermo parameters method data are transmitted between laser cutting control apparatus to laser cutter, determine the maximum allowable variation scope of cutting zone thermo parameters method data, comprising:

According to formula:

${\mathrm{\&alpha;}}_i={\mathrm{\&alpha;}}_i^c+({\mathrm{\&theta;}}_r+1){\mathrm{\&alpha;}}_i^r{\mathrm{\&delta;}}_i,\left(\right|{\mathrm{\&delta;}}_i|\&le;1)$

Determine the maximum allowable variation scope of cutting zone thermo parameters method data; Wherein, α _icontrol system for the parameters of laser cutting based on temperature field meets the uncertain parameter of robustness requirement; for α _iaverage; for α _ideviation; θ _rfor the Robust Reliable of the control system of the parameters of laser cutting based on temperature field, θ _r=min (|| δ || _∞)-1; Min (|| δ || _∞) be the Multidisciplinary systems index of the control system of parameters of laser cutting based on temperature field.

Based on a control device for the parameters of laser cutting in temperature field, comprising:

Thermo parameters method data acquisition unit, for obtaining cutting zone thermo parameters method data by infrared thermal imagery system, and determines the temperature value of each temperature spot in described temperature field according to described thermo parameters method data;

Control strategy determining unit, for the control strategy of the temperature value determination parameters of laser cutting according to temperature spot each in described temperature field;

Parameters of laser cutting control unit, for controlling described parameters of laser cutting according to the control strategy of described parameters of laser cutting, cuts workpiece to be cut to make laser cutter according to described parameters of laser cutting.

Concrete, described infrared thermal imagery system comprises the first infrared camera and the second infrared camera that are distributed in laser cutter both sides;

Described thermo parameters method data acquisition unit, comprising:

First acquisition module, for gathering cutting zone thermo parameters method data by described first infrared camera, and determines the first temperature value of each temperature spot in described temperature field;

Second acquisition module, for gathering cutting zone thermo parameters method data by described second infrared camera, and determines the second temperature value of each temperature spot in described temperature field;

Comparison module, for the first temperature value of temperature spot each in described temperature field and the second temperature value being compared, chooses the higher value among the first temperature value of each temperature spot and the second temperature value, using the temperature value of described higher value as described temperature spot.

In addition, described control strategy determining unit, specifically for:

At N _minT1<N _t1<N _maxT1time, determine that described control strategy is described parameters of laser cutting without the need to adjustment, maintain current parameters of laser cutting; Wherein, N _t1for the temperature value of temperature spot each in described temperature field is greater than T ₁the number of temperature, N _minT1be a first temperature spot amount threshold pre-set, N _maxT1it is a second temperature spot amount threshold pre-set.

Further, described control strategy determining unit, also for:

At N _t1>=N _maxT1, and N _t2>=N _maxT2time, determine that described control strategy is that laser cutting process is abnormal, stop treating cut workpiece cutting; Wherein, N _t2for the temperature value of temperature spot each in described temperature field is greater than T ₂the number of temperature, T ₂>T ₁, N _maxT2it is a 3rd temperature spot amount threshold pre-set;

At N _t1>=N _maxT1, and N _t2<N _maxT2, N _t3<N _maxT3time, determine that described control strategy is the laser power in parameters of laser cutting be reduced to the first preset percentage of present laser power or the cutting speed in parameters of laser cutting be increased to the second preset percentage of current cutting speed; Wherein, N _t3for the temperature value of temperature spot each in described temperature field is greater than T ₃the number of temperature, T ₃<T ₁, N _maxT3it is a 4th temperature spot amount threshold pre-set;

At N _t1>=N _maxT1, and N _t2<N _maxT2, N _t3>=N _maxT3time, determine that described control strategy is the laser power in parameters of laser cutting be increased to the 3rd preset percentage of present laser power or the cutting speed in parameters of laser cutting be reduced to the 4th preset percentage of current cutting speed.

Further, described control strategy determining unit, also for:

At N _t1≤ N _minT1time, determine that described control strategy is that laser cutting process is abnormal, stop treating cut workpiece cutting.

In addition, based on the control device of the parameters of laser cutting in temperature field, thermo parameters method data screening unit should also be comprised, for:

The unascertained information of the results change of cutting zone thermo parameters method data is obtained according to infrared thermal imagery system, and the time lag information that cutting zone thermo parameters method data are transmitted between laser cutting control apparatus to laser cutter, determine the maximum allowable variation scope of cutting zone thermo parameters method data;

Cutting zone thermo parameters method data outside described maximum allowable variation scope are rejected, and obtains the cutting zone thermo parameters method data within described maximum allowable variation scope.

In addition, described thermo parameters method data screening unit, specifically for:

According to formula:

${\mathrm{\&alpha;}}_r={\mathrm{\&alpha;}}_i^c+({\mathrm{\&theta;}}_r+1){\mathrm{\&alpha;}}_i^r{\mathrm{\&delta;}}_i,\left(\right|{\mathrm{\&delta;}}_i|\&le;1)$

Determine the maximum allowable variation scope of cutting zone thermo parameters method data; Wherein, α _icontrol system for the parameters of laser cutting based on temperature field meets the uncertain parameter of robustness requirement; for α _iaverage; for α _ideviation; θ _rfor the Robust Reliable of the control system of the parameters of laser cutting based on temperature field, θ _r=min (|| δ || _∞)-1; Min (|| δ || _∞) be the Multidisciplinary systems index of the control system of parameters of laser cutting based on temperature field.

Based on a control system for the parameters of laser cutting in temperature field, comprising: laser cutter, infrared thermal imagery system, Cutting platform, laser cutting control apparatus, AC servo motor; Described AC servo motor is for driving described laser cutter;

Described infrared thermal imagery system comprises the first infrared camera and the second infrared camera; Described first infrared camera and the second infrared camera are distributed in described laser cutter both sides, to gather the thermo parameters method data that laser cutter sends when cutting workpiece to be cut; Described Cutting platform is positioned at the below of described laser cutter;

Described first infrared camera is connected with described laser cutting control apparatus respectively by Ethernet with the second infrared camera; Described laser cutting control apparatus is connected with described AC servo motor, and is connected with described laser cutter by an I/O port.

In addition, based on the control system of the parameters of laser cutting in temperature field, also programmable logic controller (PLC) should be comprised;

Described programmable logic controller (PLC) is connected with described laser cutting control apparatus;

Described programmable logic controller (PLC) is connected with the proportional servo valve of laser cutter and autofocus system respectively by the 2nd I/O port.

The control method of a kind of parameters of laser cutting based on temperature field that the embodiment of the present invention provides, Apparatus and system, the control strategy of parameters of laser cutting can be determined by the thermo parameters method data of cutting zone during laser cutting, thus the items of equipment rule of thumb manually adjusted without the need to laser cutting operation person in laser cutting, avoid current parameters of laser cutting only to rely on laser cutting operation person rule of thumb manually adjusts, cause each point otherness in cutting path large, be difficult to the uniformity realizing kerf quality, easily make the problem that workpiece quality is poor or scrap.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

The flow chart one of the control method of a kind of parameters of laser cutting based on temperature field that Fig. 1 provides for the embodiment of the present invention;

The flowchart 2 of the control method of a kind of parameters of laser cutting based on temperature field that Fig. 2 provides for the embodiment of the present invention;

The structural representation one of the control device of a kind of parameters of laser cutting based on temperature field that Fig. 3 provides for the embodiment of the present invention;

The structural representation two of the control device of a kind of parameters of laser cutting based on temperature field that Fig. 4 provides for the embodiment of the present invention;

The structural representation of the control system of a kind of parameters of laser cutting based on temperature field that Fig. 5 provides for the embodiment of the present invention.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

As shown in Figure 1, the embodiment of the present invention provides a kind of control method of the parameters of laser cutting based on temperature field, comprising:

Step 101, obtain cutting zone thermo parameters method data by infrared thermal imagery system, and determine the temperature value of each temperature spot in temperature field according to thermo parameters method data.

Step 102, control strategy according to the temperature value determination parameters of laser cutting of temperature spot each in temperature field.

Step 103, control parameters of laser cutting according to the control strategy of parameters of laser cutting, cut workpiece to be cut to make laser cutter according to parameters of laser cutting.

The control method of a kind of parameters of laser cutting based on temperature field that the embodiment of the present invention provides, the control strategy of parameters of laser cutting can be determined by the thermo parameters method data of cutting zone during laser cutting, thus the items of equipment rule of thumb manually adjusted without the need to laser cutting operation person in laser cutting, avoid current parameters of laser cutting only to rely on laser cutting operation person rule of thumb manually adjusts, cause each point otherness in cutting path large, be difficult to the uniformity realizing kerf quality, easily make the problem that workpiece quality is poor or scrap.

In order to make those skilled in the art better understand the present invention, enumerate an embodiment specifically below, as shown in Figure 2, the embodiment of the present invention provides a kind of control method of the parameters of laser cutting based on temperature field, comprising:

Step 201, gather cutting zone thermo parameters method data by the first infrared camera, and gather cutting zone thermo parameters method data by the second infrared camera.

Concrete, the specification of the data point of thermo parameters method data that each infrared camera gathers herein can be 512*512 pixel, and each data point size is 0.07mm/pixel.Like this, the pixel of an infrared camera collection is 262144.

Herein, infrared thermal imagery system comprises the first infrared camera and the second infrared camera that are distributed in laser cutter both sides; Like this, gather cutting zone thermo parameters method data by two infrared cameras, can eliminate because cut direction is different, the change of the nozzle shade brought is on the impact of thermo parameters method data.

Step 202, obtain the unascertained information of the results change of cutting zone thermo parameters method data according to infrared thermal imagery system, and the time lag information that cutting zone thermo parameters method data are transmitted between laser cutting control apparatus to laser cutter, determine the maximum allowable variation scope of cutting zone thermo parameters method data.

Concrete, the unascertained information of the results change of cutting zone thermo parameters method data is obtained according to infrared thermal imagery system, and the time lag information that cutting zone thermo parameters method data are transmitted between laser cutting control apparatus to laser cutter, determine the maximum allowable variation scope of cutting zone thermo parameters method data, comprising:

Herein, can according to formula:

${\mathrm{\&alpha;}}_i={\mathrm{\&alpha;}}_i^c+({\mathrm{\&theta;}}_r+1){\mathrm{\&alpha;}}_i^r{\mathrm{\&delta;}}_i,\left(\right|{\mathrm{\&delta;}}_i|\&le;1)$

Determine the maximum allowable variation scope of cutting zone thermo parameters method data; Wherein, α _icontrol system for the parameters of laser cutting based on temperature field meets the uncertain parameter of robustness requirement; for α _iaverage; for α _ideviation; θ _rfor the Robust Reliable of the control system of the parameters of laser cutting based on temperature field, θ _r=min (|| δ || _∞)-1; Min (|| δ || _∞) be the Multidisciplinary systems index of the control system of parameters of laser cutting based on temperature field.

What deserves to be explained is, because the embodiment of the present invention needs to adjust parameters of laser cutting, thus the unsure states such as whole system vibration may be caused to occur, therefore, herein in order to ensure the stability that parameters of laser cutting adjusts, will obtain the uncertainty of the results change of cutting zone thermo parameters method data to infrared thermal imagery system, and the time lag that cutting zone thermo parameters method data are transmitted between laser cutting control apparatus to laser cutter is analyzed.

According to robust control theory, the result of cutting zone thermo parameters method data infrared thermal imagery system obtained is defined as α (t), then have in detection zone: α (t)=α ₀+ α ₁δ (t), δ (t) ∈ [-1,1], wherein α ₀for the average of α (t); α ₁for the deviation of α (t); δ (t) is standardization interval variable.

Like this, the Multidisciplinary systems index based on the control system of the parameters of laser cutting in temperature field can be expressed as:

θ _np＝min(||δ|| _∞)

And the Robust Reliable of control system based on the parameters of laser cutting in temperature field, θ _r=min (|| δ || _∞)-1.

In addition, control system based on the parameters of laser cutting in temperature field is controlled laser power output and is generally realized by quick I/O, the refreshing of quick I/O is realized by digital control loop, therefore the process issuing a signal to laser response based on the control system of the parameters of laser cutting in temperature field substantially can be regarded one as and determine time lag, has this:

$\stackrel{\&CenterDot;}{x}\left(t\right)=Ax\left(t\right)+A_{e}x(t-e)+Bw\left(t\right)$

z(t)＝Cx(t)+C _ex(t-e)+Dw(t)

Wherein, x (t) ∈ R ^mfor the state vector of system, w (t) ∈ R ^qthe external disturbance of finite energy, i.e. w (t) ∈ L ₂[0, ∞), z (t) ∈ R ^pfor system is adjusted output.A, A herein _e, B, C, C _e, D is the known matrix of suitable dimension, e>0 is lag time.

For the control system of the parameters of laser cutting based on temperature field, a given constant γ >0, if there is symmetric positive definite matrix ρ >0 and S>0, makes formula below set up:

$\left[\begin{array}{cccc}{A}^{T}P+PA+S& PB& C^T& {\mathrm{PA}}_e\\ B^{T}P& -\mathrm{\&gamma;}I& D^T& 0\\ C& D& -\mathrm{\&gamma;}I& C_e\\ A_e^{T}P& 0& C_e^T& -S\end{array}\right]<0$

Then based on the control system of the parameters of laser cutting in temperature field, there is H ∞ performance γ.

Host computer can be provided with in the control system of the parameters of laser cutting based on temperature field, the cutting zone thermo parameters method data that infrared camera gathers can be processed by the software in host computer, can be connected by Ethernet between this host computer and the control device of the parameters of laser cutting of rear end, thus the result of host computer is transferred to the control device of parameters of laser cutting.For single image, the processing time of software, and the result passing time of Ethernet is probabilistic, this can think delay systems with uncertainty, that is:

$\stackrel{\&CenterDot;}{x}\left(t\right)=A\left(\mathrm{\&alpha;}\right)x\left(t\right)+A_e\left(\mathrm{\&alpha;}\right)x(t-e)+B_1\left(\mathrm{\&alpha;}\right)w\left(t\right)+B_2\left(\mathrm{\&alpha;}\right)u\left(t\right)$

z(t)＝Cx(t)+C _ex(t-e)+D ₁w(t)+D ₂u(t)

Wherein, u (t) ∈ R ^rfor the control inputs of system, adopt state feedback controller: u (t)=Kx (t).Then controller is applied to the closed-loop system that system forms and is:

x(t)＝A _c(α)x(t)+A _e(α)x(t-e)+B ₁(α)w(t)

z(t)＝C _cx(t)+C _ex(t-e)+D ₁w(t)

Wherein, A _c(α)=A (α)+B ₂(α) K; C _c=C+D ₂k

Based on sometimes the becoming uncertain parameter α (t) and can be limited by its bound of control system of the parameters of laser cutting in temperature field, interval variable can be described it as,, and be expressed as normalized form, and then sytem matrix is expressed as affine matrix functional form:

A _c(α)＝A _c(δ)＝A ₀+∑ _iA _iδ _i(t)

A _e(α)＝A _e(δ)＝A _d0+∑ _jA _ejδ _j(t)

B ₁(α)＝B ₁(δ)＝B ₁₀+∑ _kA _1kδ _k(t)

B ₂(α)＝B ₂(δ)＝B ₂₀+∑ _lA _2lδ _l(t)

By δ (t) referred to as δ, to time-varying Hurst index time lag system and given constant γ >0, there is symmetric positive definite matrix ρ >0 and S>0, formula below set up:

$\left[\begin{array}{cccc}{\&part;}_1& {\&part;}_2& C_c^T& {\&part;}_3\\ \mathrm{\&beta;}& -\mathrm{\&gamma;}I& D_1^T& 0\\ \mathrm{\&beta;}& \mathrm{\&beta;}& -\mathrm{\&gamma;}I& C_e\\ \mathrm{\&beta;}& \mathrm{\&beta;}& \mathrm{\&beta;}& -S\end{array}\right]<0$

Wherein, " β " represents the transposition of symmetrical matrix block.

Wherein, ${\&part;}_1=P{(A_0+B_{20}K)}^T+P(A_0+B_{20}K)+\underset{i}{\&Sigma;}(A_i^{T}P+{\mathrm{PA}}_i){\mathrm{\&delta;}}_i+\underset{i}{\&Sigma;}\&lsqb;P{\left(B_{2l}K\right)}^T+P\left(B_{2l}K\right)\&rsqb;{\mathrm{\&delta;}}_1+S$

${\&part;}_2={\mathrm{PB}}_{10}+{\mathrm{\&Sigma;}}_K{\mathrm{PB}}_{1k}{\mathrm{\&delta;}}_k$

${\&part;}_3={\mathrm{PA}}_{d0}+{\mathrm{\&Sigma;}}_j{\mathrm{PA}}_{dj}{\mathrm{\&delta;}}_j$

From control performance angle, when $\left[\begin{array}{cccc}{\&part;}_1& {\&part;}_2& C_c^T& {\&part;}_3\\ \mathrm{\&beta;}& -\mathrm{\&gamma;}I& D_1^T& 0\\ \mathrm{\&beta;}& \mathrm{\&beta;}& -\mathrm{\&gamma;}I& C_e\\ \mathrm{\&beta;}& \mathrm{\&beta;}& \mathrm{\&beta;}& -S\end{array}\right]<0$ During establishment, system is reliable, so can be defined as based on the power function of the control system performance reliability analysis of the parameters of laser cutting in temperature field:

$M\left(\mathrm{\&delta;}\right)=\left[\begin{array}{cccc}{\&part;}_1& {\&part;}_2& C_c^T& {\&part;}_3\\ \mathrm{\&beta;}& -\mathrm{\&gamma;}I& D_1^T& 0\\ \mathrm{\&beta;}& \mathrm{\&beta;}& -\mathrm{\&gamma;}I& C_e\\ \mathrm{\&beta;}& \mathrm{\&beta;}& \mathrm{\&beta;}& -S\end{array}\right]$

Herein, define:

Will $M\left(\mathrm{\&delta;}\right)=\left[\begin{array}{cccc}{\&part;}_1& {\&part;}_2& C_c^T& {\&part;}_3\\ \mathrm{\&beta;}& -\mathrm{\&gamma;}I& D_1^T& 0\\ \mathrm{\&beta;}& \mathrm{\&beta;}& -\mathrm{\&gamma;}I& C_e\\ \mathrm{\&beta;}& \mathrm{\&beta;}& \mathrm{\&beta;}& -S\end{array}\right]$ Be expressed as: M (δ)=M (δ, P, S), thus can by following optimization problem based on the robust reliability of the control system of the parameters of laser cutting in temperature field:

$\left\{\begin{array}{c}min\left|\right|\mathrm{\&delta;}\left|\right|\mathrm{\&infin;}\\ M_1=M({\mathrm{\&delta;}}^{*},P,S)<0,(P>0,S>0)\\ M_2=M(\mathrm{\&delta;},P^{*},S^{*})\end{array}\right.$

Can LMI method and Multidisciplinary systems index method for solving be passed through herein, obtain the Robust Reliable of the control system of the parameters of laser cutting based on temperature field, θ _r=min (|| δ || _∞)-1.And then, can according to following formula:

${\mathrm{\&alpha;}}_i={\mathrm{\&alpha;}}_i^c+({\mathrm{\&theta;}}_r+1){\mathrm{\&alpha;}}_i^r{\mathrm{\&delta;}}_i,\left(\right|{\mathrm{\&delta;}}_i|\&le;1)$

Determine the maximum allowable variation scope of cutting zone thermo parameters method data.

Step 203, the cutting zone thermo parameters method data outside maximum allowable variation scope to be rejected, and obtain the cutting zone thermo parameters method data within maximum allowable variation scope.

Like this, discrete cutting zone thermo parameters method data can be avoided the interference of final result.

Step 204, determined the first temperature value of each temperature spot in temperature field by the cutting zone thermo parameters method data within the maximum allowable variation scope of the first infrared camera collection, and determine the second temperature value of each temperature spot in temperature field by the cutting zone thermo parameters method data within the maximum allowable variation scope of the second infrared camera collection.

Step 205, the first temperature value of temperature spot each in temperature field and the second temperature value to be compared, choose the higher value among the first temperature value of each temperature spot and the second temperature value, using the temperature value of higher value as temperature spot.

After step 205, step 206, step 207, step 208, step 209 or step 210 is performed.

If step 206 N _minT1<N _t1<N _maxT1, determine that control strategy is parameters of laser cutting without the need to adjustment, maintain current parameters of laser cutting; Wherein, N _t1for the temperature value of temperature spot each in temperature field is greater than T ₁the number of temperature, such as, this T ₁temperature can be 300 DEG C, N _minT1being a first temperature spot amount threshold pre-set, such as, can be 1000, N _maxT1being a second temperature spot amount threshold pre-set, such as, can be 2500.

If step 207 N _t1>=N _maxT1, and N _t2>=N _maxT2, determine that control strategy is that laser cutting process is abnormal, stop treating cut workpiece cutting; Wherein, N _t2for the temperature value of temperature spot each in temperature field is greater than T ₂the number of temperature, T ₂>T ₁, such as T ₂can be 400 DEG C, N _maxT2being a 3rd temperature spot amount threshold pre-set, such as, can be 100.

If step 208 N _t1>=N _maxT1, and N _t2<N _maxT2, N _t3<N _maxT3, determine that control strategy is the laser power in parameters of laser cutting be reduced to the first preset percentage of present laser power or the cutting speed in parameters of laser cutting be increased to the second preset percentage of current cutting speed.Wherein, N _t3for the temperature value of temperature spot each in temperature field is greater than T ₃the number of temperature, T ₃<T ₁, such as T ₃be 200 DEG C, N _maxT3being a 4th temperature spot amount threshold pre-set, such as, can be 11000.This first preset percentage and the second preset percentage can be 10%, but are not only confined to this.

If step 209 N _t1>=N _maxT1, and N _t2<N _maxT2, N _t3>=N _maxT3, determine that control strategy is the laser power in parameters of laser cutting be increased to the 3rd preset percentage of present laser power or the cutting speed in parameters of laser cutting be reduced to the 4th preset percentage of current cutting speed.3rd preset percentage and the 4th preset percentage also can be 10%, but are not only confined to this.

If step 210 N _t1≤ N _minT1, determine that control strategy is that laser cutting process is abnormal, stop treating cut workpiece cutting.After step 206, step 207, step 208, step 209 and step 210, perform step 211.

Step 211, control parameters of laser cutting according to the control strategy of parameters of laser cutting, cut workpiece to be cut to make laser cutter according to parameters of laser cutting.

The control method of a kind of parameters of laser cutting based on temperature field that the embodiment of the present invention provides, the control strategy of parameters of laser cutting can be determined by the thermo parameters method data of cutting zone during laser cutting, thus the items of equipment rule of thumb manually adjusted without the need to laser cutting operation person in laser cutting, avoid current parameters of laser cutting only to rely on laser cutting operation person rule of thumb manually adjusts, cause each point otherness in cutting path large, be difficult to the uniformity realizing kerf quality, easily make the problem that workpiece quality is poor or scrap.

Corresponding to the embodiment of the method shown in above-mentioned Fig. 1, Fig. 2, as shown in Figure 3, the embodiment of the present invention also provides a kind of control device of the parameters of laser cutting based on temperature field, comprising:

Thermo parameters method data acquisition unit 31, can obtain cutting zone thermo parameters method data by infrared thermal imagery system, and determine the temperature value of each temperature spot in temperature field according to thermo parameters method data.

Control strategy determining unit 32, can according to the control strategy of the temperature value determination parameters of laser cutting of temperature spot each in temperature field.

Parameters of laser cutting control unit 33, can control parameters of laser cutting according to the control strategy of parameters of laser cutting, cut workpiece to be cut to make laser cutter according to parameters of laser cutting.

Concrete, infrared thermal imagery system comprises the first infrared camera and the second infrared camera that are distributed in laser cutter both sides.

As shown in Figure 4, this thermo parameters method data acquisition unit 31, can comprise:

First acquisition module 311, can gather cutting zone thermo parameters method data by the first infrared camera, and determine the first temperature value of each temperature spot in temperature field.

Second acquisition module 312, can gather cutting zone thermo parameters method data by the second infrared camera, and determine the second temperature value of each temperature spot in temperature field.

Comparison module 313, can compare the first temperature value of temperature spot each in temperature field and the second temperature value, chooses the higher value among the first temperature value of each temperature spot and the second temperature value, using the temperature value of higher value as temperature spot.

In addition, control strategy determining unit 32, specifically can:

At N _minT1<N _t1<N _maxT1time, determine that control strategy is parameters of laser cutting without the need to adjustment, maintain current parameters of laser cutting; Wherein, N _t1for the temperature value of temperature spot each in temperature field is greater than T ₁the number of temperature, N _minT1be a first temperature spot amount threshold pre-set, N _maxT1it is a second temperature spot amount threshold pre-set.

Further, control strategy determining unit 32, all right:

At N _t1>=N _maxT1, and N _t2>=N _maxT2time, determine that control strategy is that laser cutting process is abnormal, stop treating cut workpiece cutting; Wherein, N _t2for the temperature value of temperature spot each in temperature field is greater than T ₂the number of temperature, T ₂>T ₁, N _maxT2it is a 3rd temperature spot amount threshold pre-set.

At N _t1>=N _maxT1, and N _t2<N _maxT2, N _t3<N _maxT3time, determine that control strategy is the laser power in parameters of laser cutting be reduced to the first preset percentage of present laser power or the cutting speed in parameters of laser cutting be increased to the second preset percentage of current cutting speed; Wherein, N _t3for the temperature value of temperature spot each in temperature field is greater than T ₃the number of temperature, T ₃<T ₁, N _maxT3it is a 4th temperature spot amount threshold pre-set.

At N _t1>=N _maxT1, and N _t2<N _maxT2, N _t3>=N _maxT3time, determine that control strategy is the laser power in parameters of laser cutting be increased to the 3rd preset percentage of present laser power or the cutting speed in parameters of laser cutting be reduced to the 4th preset percentage of current cutting speed.

Further, control strategy determining unit 32, all right:

At N _t1≤ N _minT1time, determine that control strategy is that laser cutting process is abnormal, stop treating cut workpiece cutting.

In addition, as shown in Figure 4, based on the control device of the parameters of laser cutting in temperature field, thermo parameters method data screening unit 34 should also be comprised, can:

The unascertained information of the results change of cutting zone thermo parameters method data is obtained according to infrared thermal imagery system, and the time lag information that cutting zone thermo parameters method data are transmitted between laser cutting control apparatus to laser cutter, determine the maximum allowable variation scope of cutting zone thermo parameters method data.

Cutting zone thermo parameters method data outside maximum allowable variation scope are rejected, and obtains the cutting zone thermo parameters method data within maximum allowable variation scope.

In addition, thermo parameters method data screening unit 34, specifically can:

According to formula:

${\mathrm{\&alpha;}}_i={\mathrm{\&alpha;}}_i^c+({\mathrm{\&theta;}}_r+1){\mathrm{\&alpha;}}_i^r{\mathrm{\&delta;}}_i,\left(\right|{\mathrm{\&delta;}}_i|\&le;1)$

Determine the maximum allowable variation scope of cutting zone thermo parameters method data; Wherein, α _icontrol system for the parameters of laser cutting based on temperature field meets the uncertain parameter of robustness requirement; for α _iaverage; for α _ideviation; θ _rfor the Robust Reliable of the control system of the parameters of laser cutting based on temperature field, θ _r=min (|| δ || _∞)-1; Min (|| δ || _∞) be the Multidisciplinary systems index of the control system of parameters of laser cutting based on temperature field.

What deserves to be explained is, the specific implementation of the control device of the parameters of laser cutting based on temperature field that the embodiment of the present invention provides see embodiment of the method corresponding to above-mentioned Fig. 1 and Fig. 2, can repeat no more herein.

The control device of the parameters of laser cutting based on temperature field that the embodiment of the present invention provides, the control strategy of parameters of laser cutting can be determined by the thermo parameters method data of cutting zone during laser cutting, thus the items of equipment rule of thumb manually adjusted without the need to laser cutting operation person in laser cutting, avoid current parameters of laser cutting only to rely on laser cutting operation person rule of thumb manually adjusts, cause each point otherness in cutting path large, be difficult to the uniformity realizing kerf quality, easily make the problem that workpiece quality is poor or scrap.

As shown in Figure 5, the embodiment of the present invention provides a kind of control system 40 of the parameters of laser cutting based on temperature field, comprising: laser cutter 41, infrared thermal imagery system 42, Cutting platform 43, laser cutting control apparatus 44, AC servo motor 45; AC servo motor 45 can driving laser cutter 41.

Infrared thermal imagery system 42 comprises the first infrared camera 421 and the second infrared camera 422.First infrared camera 421 and the second infrared camera 422 are distributed in laser cutter 41 both sides, to gather the thermo parameters method data that laser cutter 41 sends when cutting workpiece to be cut; Cutting platform 43 is positioned at the below of laser cutter 41.

First infrared camera 421 is connected with laser cutting control apparatus 44 respectively by Ethernet with the second infrared camera 422; Laser cutting control apparatus 44 is connected with AC servo motor 45, and is connected with laser cutter 41 by an I/O port 46.

In addition, based on the control system 40 of the parameters of laser cutting in temperature field, programmable logic controller (PLC) 47 should also be comprised.Programmable logic controller (PLC) 47 is connected with laser cutting control apparatus 44.Programmable logic controller (PLC) 47 is connected with the proportional servo valve 49 of laser cutter 41 and autofocus system 50 respectively by the 2nd I/O port 48.

What deserves to be explained is, this laser cutting control apparatus 44 can comprise host computer, numerical control system and drive system etc., but is not only confined to this.

The control system of the parameters of laser cutting based on temperature field that the embodiment of the present invention provides, the control strategy of parameters of laser cutting can be determined by the thermo parameters method data of cutting zone during laser cutting, thus the items of equipment rule of thumb manually adjusted without the need to laser cutting operation person in laser cutting, avoid current parameters of laser cutting only to rely on laser cutting operation person rule of thumb manually adjusts, cause each point otherness in cutting path large, be difficult to the uniformity realizing kerf quality, easily make the problem that workpiece quality is poor or scrap.

Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.

The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

Apply specific embodiment in the present invention to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (16)

1. based on a control method for the parameters of laser cutting in temperature field, it is characterized in that, comprising:

Obtain cutting zone thermo parameters method data by infrared thermal imagery system, and determine the temperature value of each temperature spot in described temperature field according to described thermo parameters method data;

According to the control strategy of the temperature value determination parameters of laser cutting of temperature spot each in described temperature field;

Control described parameters of laser cutting according to the control strategy of described parameters of laser cutting, cut workpiece to be cut to make laser cutter according to described parameters of laser cutting.

2. the control method of the parameters of laser cutting based on temperature field according to claim 1, is characterized in that, described infrared thermal imagery system comprises the first infrared camera and the second infrared camera that are distributed in laser cutter both sides;

Described by infrared thermal imagery system acquisition cutting zone thermo parameters method data, and the temperature value of each temperature spot in described temperature field is determined according to described thermo parameters method data, comprising:

Gather cutting zone thermo parameters method data by described first infrared camera, and determine the first temperature value of each temperature spot in described temperature field;

Gather cutting zone thermo parameters method data by described second infrared camera, and determine the second temperature value of each temperature spot in described temperature field;

First temperature value of temperature spot each in described temperature field and the second temperature value are compared, chooses the higher value among the first temperature value of each temperature spot and the second temperature value, using the temperature value of described higher value as described temperature spot.

3. the control method of the parameters of laser cutting based on temperature field according to claim 1, is characterized in that, according to the control strategy of the temperature value determination parameters of laser cutting of temperature spot each in described temperature field, comprising:

If N _minT1<N _t1<N _maxT1, determine that described control strategy is described parameters of laser cutting without the need to adjustment, maintain current parameters of laser cutting; Wherein, N _t1for the temperature value of temperature spot each in described temperature field is greater than T ₁the number of temperature, N _minT1be a first temperature spot amount threshold pre-set, N _maxT1it is a second temperature spot amount threshold pre-set.

4. the control method of the parameters of laser cutting based on temperature field according to claim 3, is characterized in that, according to the control strategy of the temperature value determination parameters of laser cutting of temperature spot each in described temperature field, also comprises:

If N _t1>=N _maxT1, and N _t2>=N _maxT2, determine that described control strategy is that laser cutting process is abnormal, stop treating cut workpiece cutting; Wherein, N _t2for the temperature value of temperature spot each in described temperature field is greater than T ₂the number of temperature, T ₂>T ₁, N _maxT2it is a 3rd temperature spot amount threshold pre-set;

If N _t1>=N _maxT1, and N _t2<N _maxT2, N _t3<N _maxT3, determine that described control strategy is the laser power in parameters of laser cutting be reduced to the first preset percentage of present laser power or the cutting speed in parameters of laser cutting be increased to the second preset percentage of current cutting speed; Wherein, N _t3for the temperature value of temperature spot each in described temperature field is greater than T ₃the number of temperature, T ₃<T ₁, N _maxT3it is a 4th temperature spot amount threshold pre-set;

If N _t1>=N _maxT1, and N _t2<N _maxT2, N _t3>=N _maxT3, determine that described control strategy is the laser power in parameters of laser cutting be increased to the 3rd preset percentage of present laser power or the cutting speed in parameters of laser cutting be reduced to the 4th preset percentage of current cutting speed.

5. the control method of the parameters of laser cutting based on temperature field according to claim 4, is characterized in that, according to the control strategy of the temperature value determination parameters of laser cutting of temperature spot each in described temperature field, also comprises:

If N _t1≤ N _minT1, determine that described control strategy is that laser cutting process is abnormal, stop treating cut workpiece cutting.

6. the control method of the parameters of laser cutting based on temperature field according to claim 5, is characterized in that, after obtaining cutting zone thermo parameters method data by infrared thermal imagery system, comprising:

The unascertained information of the results change of cutting zone thermo parameters method data is obtained according to infrared thermal imagery system, and the time lag information that cutting zone thermo parameters method data are transmitted between laser cutting control apparatus to laser cutter, determine the maximum allowable variation scope of cutting zone thermo parameters method data;

Cutting zone thermo parameters method data outside described maximum allowable variation scope are rejected, and obtains the cutting zone thermo parameters method data within described maximum allowable variation scope.

7. the control method of the parameters of laser cutting based on temperature field according to claim 6, it is characterized in that, the unascertained information of the results change of cutting zone thermo parameters method data is obtained according to infrared thermal imagery system, and the time lag information that cutting zone thermo parameters method data are transmitted between laser cutting control apparatus to laser cutter, determine the maximum allowable variation scope of cutting zone thermo parameters method data, comprising:

According to formula:

${\mathrm{\&alpha;}}_i={\mathrm{\&alpha;}}_i^c+({\mathrm{\&theta;}}_r+1){\mathrm{\&alpha;}}_i^r{\mathrm{\&delta;}}_i,\left(\right|{\mathrm{\&delta;}}_i|\&le;1)$

Determine the maximum allowable variation scope of cutting zone thermo parameters method data; Wherein, α _icontrol system for the parameters of laser cutting based on temperature field meets the uncertain parameter of robustness requirement; for α _iaverage; for α _ideviation; θ _rfor the Robust Reliable of the control system of the parameters of laser cutting based on temperature field, θ _r=min (|| δ || _∞)-1; Min (|| δ || _∞) be the Multidisciplinary systems index of the control system of parameters of laser cutting based on temperature field.

8. based on a control device for the parameters of laser cutting in temperature field, it is characterized in that, comprising:

Thermo parameters method data acquisition unit, for obtaining cutting zone thermo parameters method data by infrared thermal imagery system, and determines the temperature value of each temperature spot in described temperature field according to described thermo parameters method data;

Control strategy determining unit, for the control strategy of the temperature value determination parameters of laser cutting according to temperature spot each in described temperature field;

Parameters of laser cutting control unit, for controlling described parameters of laser cutting according to the control strategy of described parameters of laser cutting, cuts workpiece to be cut to make laser cutter according to described parameters of laser cutting.

9. the control device of the parameters of laser cutting based on temperature field according to claim 8, is characterized in that, described infrared thermal imagery system comprises the first infrared camera and the second infrared camera that are distributed in laser cutter both sides;

Described thermo parameters method data acquisition unit, comprising:

First acquisition module, for gathering cutting zone thermo parameters method data by described first infrared camera, and determines the first temperature value of each temperature spot in described temperature field;

Second acquisition module, for gathering cutting zone thermo parameters method data by described second infrared camera, and determines the second temperature value of each temperature spot in described temperature field;

Comparison module, for the first temperature value of temperature spot each in described temperature field and the second temperature value being compared, chooses the higher value among the first temperature value of each temperature spot and the second temperature value, using the temperature value of described higher value as described temperature spot.

10. the control device of the parameters of laser cutting based on temperature field according to claim 8, is characterized in that, described control strategy determining unit, specifically for:

At N _minT1<N _t1<N _maxT1time, determine that described control strategy is described parameters of laser cutting without the need to adjustment, maintain current parameters of laser cutting; Wherein, N _t1for the temperature value of temperature spot each in described temperature field is greater than T ₁the number of temperature, N _minT1be a first temperature spot amount threshold pre-set, N _maxT1it is a second temperature spot amount threshold pre-set.

The control device of 11. parameters of laser cutting based on temperature field according to claim 10, is characterized in that, described control strategy determining unit, also for:

At N _t1>=N _maxT1, and N _t2>=N _maxT2time, determine that described control strategy is that laser cutting process is abnormal, stop treating cut workpiece cutting; Wherein, N _t2for the temperature value of temperature spot each in described temperature field is greater than T ₂the number of temperature, T ₂>T ₁, N _maxT2it is a 3rd temperature spot amount threshold pre-set;

At N _t1>=N _maxT1, and N _t2<N _maxT2, N _t3<N _maxT3time, determine that described control strategy is the laser power in parameters of laser cutting be reduced to the first preset percentage of present laser power or the cutting speed in parameters of laser cutting be increased to the second preset percentage of current cutting speed; Wherein, N _t3for the temperature value of temperature spot each in described temperature field is greater than T ₃the number of temperature, T ₃<T ₁, N _maxT3it is a 4th temperature spot amount threshold pre-set;

At N _t1>=N _maxT1, and N _t2<N _maxT2, N _t3>=N _maxT3time, determine that described control strategy is the laser power in parameters of laser cutting be increased to the 3rd preset percentage of present laser power or the cutting speed in parameters of laser cutting be reduced to the 4th preset percentage of current cutting speed.

The control device of 12. parameters of laser cutting based on temperature field according to claim 11, is characterized in that, described control strategy determining unit, also for:

At N _t1≤ N _minT1time, determine that described control strategy is that laser cutting process is abnormal, stop treating cut workpiece cutting.

The control device of 13. parameters of laser cutting based on temperature field according to claim 12, is characterized in that, also comprises thermo parameters method data screening unit, for:

The unascertained information of the results change of cutting zone thermo parameters method data is obtained according to infrared thermal imagery system, and the time lag information that cutting zone thermo parameters method data are transmitted between laser cutting control apparatus to laser cutter, determine the maximum allowable variation scope of cutting zone thermo parameters method data;

Cutting zone thermo parameters method data outside described maximum allowable variation scope are rejected, and obtains the cutting zone thermo parameters method data within described maximum allowable variation scope.

The control device of 14. parameters of laser cutting based on temperature field according to claim 13, is characterized in that, described thermo parameters method data screening unit, specifically for:

According to formula:

${\mathrm{\&alpha;}}_i={\mathrm{\&alpha;}}_i^c+({\mathrm{\&theta;}}_r+1){\mathrm{\&alpha;}}_i^r{\mathrm{\&delta;}}_i,\left(\right|{\mathrm{\&delta;}}_i|\&le;1)$

Determine the maximum allowable variation scope of cutting zone thermo parameters method data; Wherein, α _icontrol system for the parameters of laser cutting based on temperature field meets the uncertain parameter of robustness requirement; for α _iaverage; for α _ideviation; θ _rfor the Robust Reliable of the control system of the parameters of laser cutting based on temperature field, θ _r=min (|| δ || _∞)-1; Min (|| δ || _∞) be the Multidisciplinary systems index of the control system of parameters of laser cutting based on temperature field.

15. 1 kinds based on the control system of the parameters of laser cutting in temperature field, is characterized in that, comprising: laser cutter, infrared thermal imagery system, Cutting platform, laser cutting control apparatus, AC servo motor; Described AC servo motor is for driving described laser cutter;

Described infrared thermal imagery system comprises the first infrared camera and the second infrared camera; Described first infrared camera and the second infrared camera are distributed in described laser cutter both sides, to gather the thermo parameters method data that laser cutter sends when cutting workpiece to be cut; Described Cutting platform is positioned at the below of described laser cutter;

Described first infrared camera is connected with described laser cutting control apparatus respectively by Ethernet with the second infrared camera; Described laser cutting control apparatus is connected with described AC servo motor, and is connected with described laser cutter by an I/O port.

The control system of 16. parameters of laser cutting based on temperature field according to claim 15, is characterized in that, also comprise programmable logic controller (PLC);

Described programmable logic controller (PLC) is connected with described laser cutting control apparatus;

Described programmable logic controller (PLC) is connected with the proportional servo valve of laser cutter and autofocus system respectively by the 2nd I/O port.