阅读说明：本技术 一种精准控制涂层形状厚度的涂覆方法 (A kind of coating method being precisely controlled coated shape thickness ) 是由 周骋 杨平 于 2019-07-03 设计创作，主要内容包括：本发明公开了一种精准控制涂层形状厚度的涂覆方法,本发明的涂覆方法是使用红外热成像法测量涂层的形状信息以及涂层上下表面的温度即通过温度差来得到涂层厚度反馈给涂层涂覆自适应PID控制算法,精准的控制脉冲喷头对LED基板的涂覆过程,达到所要求的涂层的形状厚度的高精度控制。本发明通过脉冲喷涂与图形化钢网掩膜喷涂大致的形状厚度,使用红外热成像法测得涂层的形状厚度得到的信息传递给数据库接收器进行对比,数据处理其误差反馈给自适应PID控制算法来不断优化修正涂覆过程中的控制参数,实现涂层涂覆形状厚度的精准控制。(The invention discloses a kind of coating methods for being precisely controlled coated shape thickness, coating method of the invention is to obtain coating layer thickness by temperature difference using the temperature of the shape information of infrared thermography measurement coating and coating upper and lower surface to feed back to coating coating Adaptive PID Control algorithm, accurately control pulse sprinklers reach the high-precision control of the shape thicknesses of required coating to the coating procedure of LED substrate.The present invention sprays rough shape thicknesses by Pulse Spraying and graphical steel mesh exposure mask, database receiver is passed to using the information that the shape thicknesses that infrared thermography measures coating obtain to compare, its error of data processing feeds back to Adaptive PID Control algorithm to continue to optimize the control parameter in amendment coating procedure, realizes being precisely controlled for coating coating shape thicknesses.)

1. a kind of coating method for being precisely controlled coated shape thickness, which is characterized in that measure use by infrared thermography The shape information and temperature difference of the coating of pattern mask and Pulse Spraying are again the desired coating shape in information and date library Thickness compares, and feeds back to Adaptive PID Control algorithm to continue to optimize the control parameter in amendment coating procedure, realizes and apply Layer coating shape thicknesses are precisely controlled；Characterized by comprising the following steps:

Step 1.1 makes pulse sprinklers and substrate center to be sprayed on same vertical line；

Graphical steel mesh is arranged on magnetic carrying tool after the completion of step 1.1 for step 1.2, will be graphical by magnetic force attraction Steel mesh is covered on substrate surface, to realize the graphical covering of package surface, carries out to the graphical steel mesh pattern of setting Spraying；

Step 1.3 sets the control parameter of coating after the completion of step 1.2, controls the coated shape of pulse sprinklers completing substrate The coating work of thickness；

Step 1.4 is measured the shape thicknesses of current applying coating by infrared thermography, uses PID after the completion of step 1.3 Control algolithm is completed to coat next time by the control parameter of calculating iteration optimization spray gun.

2. the coating method according to claim 1 for being precisely controlled coated shape thickness, which is characterized in that spray gun spray nozzle is adopted It is coated with dispensing spray head or atomizer or piezo jets, specifically: it is tentatively sprayed using Pulse Spraying, arteries and veins Punching spraying, with pulse frequency intermittent impacts colloid channel, makes colloid enter injection in the form of droplet logical by striker Road；Spray gun air pressure driving drop colloid quickly flows, and reaches atomization chamber, more small drop is atomized into, in the effect of pressure difference Under, spray spray gun.

3. the coating method according to claim 2 for being precisely controlled coated shape thickness, which is characterized in that infrared thermal imaging Method obtain coating shape and thickness distribution the following steps are included:

Step 3.1: using pulse excitation to coat side continuous heating, while using infrared thermal imager to standard specimen coat side Acquisition is from beginning to warm up thermal-induced imagery of the moment to constant temperature ascent stage；

Step 3.2: according to corresponding time Δ t and coating layer thickness matched curve after the completion of step 3.1, searching corresponding to Δ t Coating layer thickness, as surveyed coating layer thickness；

Step 3.3: by thermal-induced imagery it can be seen that the precise shapes of the coating of spraying.

4. the coating method according to claim 3 for being precisely controlled coated shape thickness, which is characterized in that for curve Fitting, specific steps are as follows:

Step 4.1 prepares a series of coating layer thicknesses differences, and the identical standard component of substrate thickness remembers the coating layer thickness of each standard component For d_n, n=1,2...N, N expression standard specimen quantity；

Step 4.2, to each standard specimen, is respectively adopted heating equipment and carries out to standard specimen coat side after the completion of step 4.1 Continuous uniform heating, while the coat side acquisition of standard specimen is stablized from moment to temperature is begun to warm up using thermal infrared imager The thermal-induced imagery of ascent stage obtains infrared thermal image sequence；

Step 4.3 acquires rigid start temperature using thermal infrared imager and continues at ascent stage above and below coating after the completion of step 4.2 The temperature t in face_m、t_n, calculate temperature difference Δ ti₁、Δti₂....Δti_n；

Step 4.4 is based on the collected data of step 4.3, and fitting obtains temperature difference-thickness curve；

Step 4.5 holds part to be measured using identical heating equipment when needing to carry out coating thickness measurement to measured piece Continuous heating, obtains temperature difference.

5. according to the coating method for being precisely controlled coated shape thickness of claims 3, which is characterized in that using adaptive Pid control algorithm come continue to optimize amendment coating procedure in control parameter, specific steps are as follows:

Step 5.1 compares the shape thicknesses for the coating that measurement obtains with the shape thicknesses of the coating of setting, between calculating Error；

The coating for the coating that step 5.2 is measured according to step 5.1 and the error of setting are passed through using Adaptive PID Control algorithm Some control parameters, including spraying colloid concentration amendment are corrected in study, spray height correction, and spraying rate amendment sprays timing Amendment；

Step 5.3 is completed by the amendment of step 5.2, carries out next step coating work；

Step 5.4 is compared obtained coating and setting coating, analytical error passes to again after the completion of step 5.3 Adaptive PID Control algorithm modifies control parameter, until the coated shape thickness infinite approach with setting.

Technical field

The present invention relates to coating method more particularly to a kind of coating methods for being precisely controlled coated shape thickness.

Background technique

Coating is applied to aerospace, and combustion gas chemical industry, microelectronics, the various fields such as auto industry have anti-corrosion, heat-insulated, , there is huge effect in the advantages that wear-resisting to the service life for improving product.Liter also is being continuously improved to the coating method of coating both at home and abroad Grade, therefore the coating method of coating has certain researching value.

During LED is encapsulated and is realized white light, the blue light that fluorescent powder issues chip carries out color and energy is converted and It is mixed to form white light, therefore the coating processes of fluorescent powder determine the quality of white light LEDs quality to a certain extent.And it is glimmering at present Light powder coating processes mainly use spray coating method and dotting glue method, and both manufacturing process are it is difficult to ensure that the accurate shape and thickness coated Degree, will lead to that emergent light part is partially yellow or partially blue, and the white hot spot of formation is uneven, to influence the performance of power-type LED.

Therefore, set forth herein a kind of coating methods for being precisely controlled coated shape thickness to solve this problem.

Summary of the invention

The present invention provides a kind of coating method for being precisely controlled coated shape thickness, coating method of the invention be using The coated shape thickness feedback that infrared thermography obtains coats Adaptive PID Control algorithm to coating, accurately controls pulse Spray head reaches the high-precision control of the shape thicknesses of required coating to the coating procedure of LED substrate.To improve fluorescent powder The uniformity for coating shape thicknesses, improves the optical property of LED.

The invention is realized by the following technical scheme:

A kind of coating method being precisely controlled coated shape thickness, is measured by infrared thermography using pattern mask The desired coating shape thicknesses in information and date library are carried out pair again with the shape information and temperature difference of the coating of Pulse Spraying Than feeding back to Adaptive PID Control algorithm to continue to optimize the control parameter in amendment coating procedure, realizing that coating coats shape Thickness is precisely controlled；The following steps are included:

Step 1.1 makes pulse sprinklers and substrate center to be sprayed on same vertical line；

Step 1.2 by the setting of graphical steel mesh on having magnetic carrier, is inhaled after the completion of step 1.1 by magnetic force Draw and graphical steel mesh is covered on substrate surface, so that the graphical covering of package surface is realized, to the graphical steel of setting Net pattern is sprayed；

Step 1.3 sets the control parameter of coating after the completion of step 1.2, controls the coating of pulse sprinklers completing substrate The coating work of shape thicknesses；

Step 1.4 is after the completion of step 1.3, by obtaining the detection method of coated shape thickness based on infrared thermography The shape thicknesses for measuring current applying coating are completed using pid control algorithm by the control parameter of calculating iteration optimization spray gun It coats next time.

Further, spray gun spray nozzle is coated using dispensing spray head or atomizer or piezo jets, specifically: It is tentatively sprayed using Pulse Spraying, Pulse Spraying, with pulse frequency intermittent impacts colloid channel, makes colloid by striker Injection channel is entered in the form of droplet；Spray gun air pressure driving drop colloid quickly flows, and reaches atomization chamber, is atomized into more Add small drop, under the action of pressure difference, sprays spray gun.

Further, infrared thermography obtain coating shape and thickness distribution the following steps are included:

Step 3.1: using pulse excitation to coat side continuous heating, while standard specimen being applied using infrared thermal imager Level acquisition is from beginning to warm up thermal-induced imagery of the moment to constant temperature ascent stage；

Step 3.2: according to corresponding time Δ t and coating layer thickness matched curve after the completion of step 3.1, searching Δ t institute Corresponding coating layer thickness, as surveyed coating layer thickness；

Step 3.3: by thermal-induced imagery it can be seen that the precise shapes of the coating of spraying.

Further, for the fitting of curve, specific steps are as follows:

Step 4.1 prepares a series of coating layer thicknesses differences, and the identical standard component of substrate thickness remembers the coating of each standard component With a thickness of d_n, n=1,2...N, N expression standard specimen quantity；

After the completion of step 4.1, to each standard specimen, heating equipment is respectively adopted to standard specimen coat side in step 4.2 Continuous uniform heating is carried out, while being acquired using coat side of the thermal infrared imager to standard specimen from the moment is begun to warm up to temperature Stablize the thermal-induced imagery of ascent stage, obtains infrared thermal image sequence；

Step 4.3 acquires rigid start temperature using thermal infrared imager and continues coating at ascent stage after the completion of step 4.2 The temperature t of top and bottom_m、t_n, calculate temperature difference Δ ti₁, Δ ti₂....Δti_n；

Step 4.4 is based on the collected data of step 4.3, and fitting obtains temperature difference-thickness curve；

Step 4.5 when need to measured piece carry out coating thickness measurement when, using identical heating equipment to part to be measured into Row continuous heating, obtains temperature difference.

Further, the control parameter in amendment coating procedure is continued to optimize using Adaptive PID Control algorithm, specifically Operating procedure is as follows:

Step 5.1 compares the shape thicknesses for the coating that measurement obtains with the shape thicknesses of the coating of setting, calculates it Between error；

The coating for the coating that step 5.2 is measured according to step 5.1 and the error of setting, using Adaptive PID Control algorithm, Some control parameters, including spraying colloid concentration amendment are corrected by study, sprays height correction, spraying rate amendment, spraying Timing amendment；

Step 5.3 is completed by the amendment of step 5.2, carries out next step coating work；

Step 5.4 is compared obtained coating and setting coating after the completion of step 5.3 again, and analytical error passes Adaptive PID Control algorithm is passed, control parameter is modified, until the coated shape thickness infinite approach with setting.

A kind of coating method being precisely controlled coated shape thickness, is measured by infrared thermography using pattern mask With shape and temperature difference (coating layer thickness is obtained by temperature difference) information of the coating of Pulse Spraying, then information and date Desired coating structure in library compares, its error of data processing feeds back to Adaptive PID Control algorithm and repairs to continue to optimize Control parameter in positive coating procedure, realizes being precisely controlled for coating coating shape thicknesses.The following steps are included:

1.1 control pulse sprinklers and substrate center to be sprayed are on same vertical line

1.2 after the completion of step 1.1, by the cooperation of graphical steel mesh have magnetic carrier (have on carrier with it is to be painted The groove and location hole of the device matching of painting, for fixing and positioning substrate), attracted by magnetic force and steel mesh is covered on substrate On, it realizes the graphical covering of package surface, sprays the steel mesh pattern of particular design.

1.3 after the completion of step 1.2, sets the control parameter of coating, controls the specific coating of pulse sprinklers completing substrate The coating work of shape thicknesses.

1.4 after the completion of step 1.3, and the detection method by being obtained coated shape thickness based on infrared thermography is obtained The shape thicknesses of current applying coating are completed next using pid control algorithm by the control parameter of calculating iteration optimization spray gun Secondary coating.

A kind of coating method being precisely controlled coated shape thickness according to claim 1, it is characterised in that spray gun Spray head uses dispensing spray head, atomizer, and piezo jets are coated for coating.

2.1 according to the coated shape thickness of coating, and during Pulse Spraying, striker is with the intermittent impact glue of pulse frequency Body channel, makes colloid enter injection channel in the form of droplet；Spray gun air pressure driving drop colloid quickly flows, and reaches mist Change chamber, be atomized into more small drop, under the action of pressure difference, sprays spray gun.

Further a kind of coating method for being precisely controlled coated shape thickness, it is characterised in that be based on infrared heat Imaging method obtain coating shape and thickness location mode the following steps are included:

3.1 use pulse excitation to coat side continuous heating, while using infrared thermal imager to standard specimen coat side Acquisition is from beginning to warm up thermal-induced imagery of the moment to constant temperature ascent stage；

3.2 curves being fitted after the completion of step 3.1 according to corresponding time Δ t and coating layer thickness, are searched corresponding to Δ t Coating layer thickness, as surveyed.Fitting for curve, specific steps are as follows:

1.1.1 it is different that a series of coating layer thicknesses are prepared, the identical standard component of substrate thickness remembers the painting thickness of each standard component Degree is dn, n=1,2...N, and N indicates standard specimen quantity；

3.2.2 heating equipment is respectively adopted to standard specimen coating for each standard specimen after the completion of step 3.2.1 Face carries out continuous uniform heating, while being acquired using coat side of the thermal infrared imager to standard specimen from the moment is begun to warm up to temperature The thermal-induced imagery for stablizing ascent stage is spent, infrared thermal image sequence is obtained；

3.2.3 after the completion of step 3.2.2, rigid start temperature is acquired using thermal infrared imager and continues coating at ascent stage Temperature tm, the tn of top and bottom calculate temperature difference Δ ti1, Δ ti2.... Δ tin；

3.2.4 the collected data of step 3.2.3 are based on, fitting obtains temperature difference-thickness curve；

3.2.5 when needing to carry out coating thickness measurement to measured piece, part to be measured is carried out using identical heating equipment Continuous heating obtains temperature difference, searches out coating layer thickness corresponding to Δ t in temperature difference-thickness curve that step 4 obtains

Further a kind of coating method for being precisely controlled coated shape thickness, it is characterised in that use self-adaptive PID control Algorithm processed come continue to optimize amendment coating procedure in control parameter, specific steps are as follows:

4.1 according to the coating of step 2 and the measurement of step 3, compared with the shape thicknesses of the coating of setting, between calculating Error.

The coating of 4.2 coatings measured according to step 4.1 and the error of setting are passed through using Adaptive PID Control algorithm Some control parameters, including spraying colloid concentration amendment are corrected in study, spray height correction, and spraying rate amendment sprays timing Amendment；4.3 are completed by the amendment of step 4.2, carry out next step coating work.

4.4 after the completion of step 4.3, obtained coating and setting coating is compared again, analytical error passes to Adaptive PID Control algorithm modifies control parameter, until the coated shape thickness infinite approach with setting.

The invention has the advantages that the coating method for being precisely controlled coated shape thickness of the invention, purpose solves work Coating layer thickness on industry spraying process is uneven, and the inaccurate problem of shape improves the quality of production, improves the coloured light one of LED Cause property, light extraction efficiency are high.Technical support is improved to the manufacturing of LED.

Detailed description of the invention

Fig. 1 is the flow chart of coating fluorescent powder provided by the invention；

Fig. 2 is the flow chart provided by the invention that coating layer thickness shape is obtained using infrared thermoviewer；

Fig. 3 is the control block diagram of Adaptive PID Control algorithm provided by the invention.

Specific embodiment

A kind of coating method being precisely controlled coated shape thickness includes the following steps as shown in figure；(1) control by The graphical steel mesh of laser scoring is moved to the top of substrate, and 11 (2) are overlapped with substrate center after the completion of step 1, control spray Gun sprayer is moved in LED substrate to be coated, is overlapped 12 (3) after the completion of step 2 with graphical steel mesh center, is passed through pulse Spray parameters (spray distance, colloid concentration, spraying rate etc.) 13 (4) are arranged after the completion of step 3 in operator control panel, complete LED base The spray coating operations of plate coating, and obtain its thickness shape 14 (5) and complete to apply when Front-coating mirror and setting by infrared thermal imager+PC Error and setting application condition if being less than setting error, are also terminated to spray by the shape thicknesses error 15 (6) between layer.As greatly In error, error information is passed downwards 16 (7) after the completion of step 6, according to error, the study amendment of self-adaptive PID control algolithm After the completion of step 7, pulse sprinklers can spray again control parameter 17 (8) according to modified parameter, set until error is less than Determine error, the coating of ideal shape thicknesses can be obtained.The measurement of fluorescent coating thickness, as shown in Figure 2, including it is following Step；(1) prepare that substrate thickness is identical, the different N number of standard component 21 (2) of coating layer thickness loads lasting hot arteries and veins to standard component Impulse encourages 22 (3) after the completion of step 2, and the standard component infrared thermal imagery 23 (4) acquired using infrared imaging instrument is to step 3 Upper and lower surface temperature variation curve 24 (5) are extracted after the completion obtains the survey of 25 (6) coating layer thickness of temperature difference Δ T- layer thickness profile 26 Adaptive PID Control algorithms are measured, as shown in Figure 3；Include the following steps；(1) and upper according to the coated shape thickness of setting The coating of primary coating calculates the coating error that its error 31 (2) is obtained according to step 1, using Adaptive PID Control algorithm, Current modified control parameter, the amendment including spraying height is calculated, the amendment of spraying rate sprays repairing for colloid concentration Positive 32 (3) are after the completion of step 2, and by PID regulator, adjustment parameter is transferred to coating controller 33 (4) coating controller Control coating spray head, completes coating work 34 (5) after the completion of step 4, obtains thickness shape using thermal infrared imager, and letter Breath feedback arrives step 1, this is a closed-loop control 35

For Adaptive PID Control algorithm: as follows；

In formulaRatio, integral, differential learning rate, so as to as needed to corresponding weighting be Number is adjusted.The parameters revision coefficient of spraying rate,The parameters revision coefficient of spray distance

The parameters revision coefficient of colloid concentration

U (K)-currently sprays obtained modified control parameter amount

The control parameter of the last spraying of U (K-1)-

The embodiment is a preferred embodiment of the present invention, but present invention is not limited to the embodiments described above, not In the case where substantive content of the invention, any conspicuous improvement that those skilled in the art can make, replacement Or modification all belongs to the scope of protection of the present invention.