CN118237690A - Control method for temperature of reflow soldering furnace - Google Patents
Control method for temperature of reflow soldering furnace Download PDFInfo
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- CN118237690A CN118237690A CN202410684994.7A CN202410684994A CN118237690A CN 118237690 A CN118237690 A CN 118237690A CN 202410684994 A CN202410684994 A CN 202410684994A CN 118237690 A CN118237690 A CN 118237690A
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- 238000000034 method Methods 0.000 title claims abstract description 92
- 238000005476 soldering Methods 0.000 title claims abstract description 60
- 238000003466 welding Methods 0.000 claims abstract description 322
- 230000008569 process Effects 0.000 claims abstract description 49
- 229910000679 solder Inorganic materials 0.000 claims abstract description 7
- 238000012544 monitoring process Methods 0.000 claims description 33
- 238000012549 training Methods 0.000 claims description 13
- 238000002360 preparation method Methods 0.000 claims description 7
- 238000012935 Averaging Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 abstract description 4
- 239000000523 sample Substances 0.000 description 33
- 238000010438 heat treatment Methods 0.000 description 23
- 230000007246 mechanism Effects 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
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- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 108010066278 cabin-4 Proteins 0.000 description 3
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
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- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
Abstract
The application provides a control method of reflow soldering furnace temperature, which relates to the technical field of vacuum reflow soldering, wherein the reflow soldering furnace sequentially comprises a plurality of temperature areas along the extending direction; the control method comprises the following steps: acquiring workpiece parameters of a workpiece to be welded, and obtaining a temperature process curve corresponding to the workpiece parameters of the workpiece to be welded; the workpiece parameters at least comprise solder types and soldering thicknesses; the temperature process curve represents the target welding temperature of each temperature zone; and controlling the temperature of each temperature zone to be adjusted to the corresponding target welding temperature according to a temperature process curve corresponding to the workpiece parameters of the workpiece to be welded, and sending the workpiece to be welded into a reflow soldering furnace for soldering. According to the method, the target welding temperature is obtained in advance according to the workpiece parameters, so that the welding quality of the workpiece is guaranteed to be good, a large number of experiments are not needed, the welding cost is saved, and the welding quality is improved.
Description
Technical Field
The application relates to the technical field of vacuum reflow soldering, in particular to a method for controlling the temperature of a reflow soldering furnace.
Background
Along with the continuous development of semiconductor technology and electronic components, the SMT technology is updated continuously, and the vacuum reflow soldering technology is widely applied, and is applied to various key fields, a vacuum reflow soldering furnace is often adopted in the soldering process, and a plurality of independent temperature-controlled cabins are arranged in the vacuum reflow soldering furnace.
In the prior art, before a workpiece is ready to be welded, an experiment workpiece is required to be tried continuously so as to find the temperature of each temperature zone which can enable the welding quality of the workpiece to reach a good degree, and then the welding process is performed after each temperature zone in the vacuum reflow soldering furnace is controlled to reach the temperature, so that the welding workload is increased, a large amount of experiment workpieces are wasted, and the welding cost is increased.
Disclosure of Invention
In view of the above-mentioned drawbacks or shortcomings of the prior art, the present application is directed to a method for controlling a temperature of a reflow soldering oven, the reflow soldering oven comprising a plurality of temperature zones in sequence along an extending direction thereof; the control method comprises the following steps:
Acquiring workpiece parameters of a workpiece to be welded, and obtaining a temperature process curve corresponding to the workpiece parameters of the workpiece to be welded; the workpiece parameters at least comprise solder types and soldering thicknesses; the temperature process curve represents the target welding temperature of each temperature zone;
and controlling the temperature of each temperature zone to be adjusted to the corresponding target welding temperature according to a temperature process curve corresponding to the workpiece parameters of the workpiece to be welded, and sending the workpiece to be welded into the reflow soldering furnace for soldering.
According to the technical scheme provided by the application, a temperature prediction model is adopted to obtain a temperature process curve corresponding to the workpiece parameters of the workpiece to be welded; the temperature prediction model is constructed by the following steps:
acquiring multiple groups of historical temperature data sets, wherein each group of historical temperature data set comprises workpiece parameters of a reference welding workpiece and a historical temperature sequence, and the historical temperature sequence comprises optimized welding temperatures of all temperature areas;
And acquiring an initial network model, taking the workpiece parameters of the reference welding workpiece as input, taking the historical temperature sequence as output, and training the initial network model to obtain a temperature prediction model.
According to the technical scheme provided by the application, the acquisition of a plurality of groups of historical temperature data sets at least comprises the step of acquiring a group of historical temperature sequences of the historical temperature data sets;
the acquiring a set of historical temperature sequences of the set of historical temperature data sets at least comprises the steps of:
Acquiring historical welding information corresponding to a plurality of welding workpiece samples with the same workpiece parameters of the reference welding workpieces of the set of historical temperature data sets, wherein the historical welding information at least comprises equipment information and workpiece information in a welding process, the equipment information at least comprises historical welding temperatures of all the temperature areas, and the workpiece information at least comprises welding quality grades;
And selecting a welding workpiece sample with the welding quality grade being greater than or equal to a first preset grade, and taking the historical welding temperature of each temperature zone corresponding to the welding workpiece sample as the optimized welding temperature of each temperature zone in a historical temperature sequence corresponding to the reference welding workpiece of the set of historical temperature data sets.
According to the technical scheme provided by the application, the step of acquiring the historical welding information corresponding to a plurality of welding workpiece samples with the same workpiece parameters of the reference welding workpiece of the set of historical temperature data sets at least comprises the following steps:
The method comprises the steps of calling a welding history database, wherein the welding history database comprises a plurality of welding workpiece samples and history welding information corresponding to each welding workpiece sample;
Traversing the welding history database to obtain historical welding information of a plurality of welding workpiece samples corresponding to the workpiece parameter information of the reference welding workpiece of the set of historical temperature data sets, wherein the workpiece parameter information is the same as the workpiece parameter information of the reference welding workpiece.
According to the technical scheme provided by the application, a plurality of temperature monitoring points are uniformly arranged in each temperature zone, and each temperature monitoring point is provided with a temperature acquisition element; the method further comprises the steps of:
After receiving a starting signal of a reflow soldering furnace, acquiring actual temperatures of workpieces entering the reflow soldering furnace at the temperature monitoring points;
Averaging the actual temperatures of all the temperature monitoring points in the same temperature zone to obtain the historical welding temperature of the temperature zone;
And acquiring the workpiece parameters of the workpiece and the welding quality grade of the workpiece after the welding is finished, taking the workpiece as a preparation workpiece sample, and storing the corresponding workpiece parameters, the welding quality grade after the welding is finished and the historical welding temperature in each temperature zone into a preparation database.
According to the technical scheme provided by the application, after the workpiece parameters of the workpiece and the welding quality grade of the workpiece after the welding is finished are obtained, the method further comprises the following steps:
Judging whether the workpiece parameters of the workpiece have the matched welding workpiece samples in the welding history database;
after the workpiece is used as a prepared workpiece sample and the corresponding workpiece parameters and the welding quality grade after the welding is finished are stored in a prepared database, the method further comprises the following steps:
If the workpiece parameters of the workpiece have the matched welding workpiece samples in the welding history database, and the welding quality grade of the workpiece after the welding is finished is greater than that of the welding workpiece samples, taking the welding workpiece samples as failure samples;
And updating the historical welding information of the failure sample in the welding history database with the welding quality grade of the prepared workpiece sample and the historical welding temperature of each temperature zone.
According to the technical scheme provided by the application, after the workpiece to be welded is sent into the reflow soldering furnace for soldering, the method further comprises the following steps:
When the workpiece to be welded reaches the first temperature monitoring point position in each temperature zone, collecting the first temperature of the first temperature monitoring point position of the workpiece to be welded in each temperature zone;
When the absolute value of the difference between the first temperature and the target welding temperature corresponding to the temperature zone is judged to be larger than or equal to a first preset threshold value, calculating the temperature adjustment quantity of the temperature zone;
and adjusting the target welding temperature of the temperature zone based on the temperature adjustment amount to obtain an updated welding temperature, and controlling the temperature zone to be adjusted to the updated welding temperature.
According to the technical scheme provided by the application, after the temperature zone is controlled to be adjusted to the updated welding temperature, the method further comprises the following steps:
collecting a second temperature of a next temperature monitoring point of the first temperature monitoring point of the workpiece to be welded in the temperature zone;
and when the absolute value of the difference between the second temperature and the updated welding temperature is larger than or equal to a second preset threshold value, a first early warning signal is sent out.
According to the technical scheme provided by the application, a temperature process curve corresponding to the workpiece parameters of the workpiece to be welded is obtained by adopting a welding history database, and the temperature process curve corresponding to the workpiece parameters of the workpiece to be welded is obtained by adopting the welding history database, and at least the following steps are included:
Traversing the welding history database, and obtaining the temperature process curve based on the historical welding temperature of the welding workpiece sample in each temperature zone when the welding workpiece sample matched with the workpiece parameters of the workpiece to be welded is arranged in the welding history database and the welding quality grade of the matched welding workpiece sample is larger than or equal to a second preset grade;
the welding history database comprises a plurality of welding workpiece samples and history welding information corresponding to each welding workpiece sample, wherein the history welding information comprises workpiece parameters, welding quality grades and history welding temperatures in each temperature zone.
In summary, the present application provides a method for controlling a temperature of a reflow soldering furnace, wherein the reflow soldering furnace sequentially includes a plurality of temperature areas along an extending direction thereof, the method comprising the steps of: acquiring workpiece parameters of a workpiece to be welded, and obtaining a temperature process curve corresponding to the workpiece parameters of the workpiece to be welded; the workpiece parameters at least comprise solder types and soldering thicknesses; the temperature process curve represents the target welding temperature of each temperature zone; and controlling the temperature of each temperature zone to be adjusted to the corresponding target welding temperature according to a temperature process curve corresponding to the workpiece parameters of the workpiece to be welded, and sending the workpiece to be welded into a reflow soldering furnace for soldering.
Compared with the prior art, the application has the beneficial effects that: according to the method, the workpiece parameters of the workpiece to be welded are firstly obtained, the temperature process curve corresponding to the workpiece parameters is obtained, the temperature process curve represents the target welding temperature of each temperature zone, if the workpiece to be welded is welded under the working condition of the target welding temperature of each temperature zone, the target welding temperature is predicted in advance according to the workpiece parameters, so that the excellent welding quality of the workpiece can be ensured, a large number of experiments are not needed, the welding cost is saved, and the welding quality is improved.
Drawings
FIG. 1 is a flow chart of the steps of a method for controlling the temperature of a reflow oven according to the present application;
FIG. 2 is a schematic diagram of a reflow oven according to the present application;
fig. 3 is a schematic structural view of a heating cabin of the reflow soldering furnace.
The text labels in the figures are expressed as:
2. Heating the cabin body; 3. a vacuum cabin; 4. cooling the cabin; 21. a heating assembly; 22. a transport rail; 23. a cross beam; 24. a fan assembly; 25. monitoring the temperature at the point; 26. and the current equalizing component.
Detailed Description
The application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the application are shown in the drawings.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
Example 1
As mentioned in the background art, in order to solve the problems in the prior art, this embodiment proposes a vacuum reflow soldering furnace, as shown in fig. 2 and 3 (partially enlarged front portion of fig. 2), comprising:
A housing having a first space therein; a heating cabin body 2, a vacuum cabin body 3 and a cooling cabin body 4 are sequentially arranged in the first space along the extending direction of the first space, each cabin body is internally provided with a plurality of independent sub-cabin bodies, and the area in each sub-cabin body is a temperature area;
The conveying mechanism comprises a conveying rail 22 capable of moving along the extending direction of the shell, and a tray is arranged on the conveying rail 22 and used for bearing workpieces to be welded; the transmission motor is arranged outside the first space and used for driving the conveying rail 22 so that the tray carries the workpieces to be welded to enter each cabin in sequence for welding;
Optionally, a cross beam 23 is further disposed at the bottom of the transportation rail 22, so as to improve stability of the transportation rail 22.
The flow equalizing assembly 26, the flow equalizing assembly 26 includes a plurality of first flow equalizing plates disposed above the transportation rail 22, and a plurality of second flow equalizing plates disposed below the transportation rail 22;
The two groups of heating mechanisms are respectively arranged above and below the first space, each group of heating mechanism comprises a heating component 21 and a fan component 24, one group of heating mechanism is arranged below the first flow equalizing plate, the other group of heating mechanism is arranged below the second flow equalizing plate, and the fan component 24 can bring out the air heated by the heating component 21, so that a convection effect is formed, the air in each cabin is stirred to quickly heat the electronic components on the workpieces to be welded, the electronic components are heated comprehensively, and the welding purpose is achieved;
Specifically, the heating mechanism penetrates through three cabins, in the prior art, the heating mechanism is only arranged in the heating cabin 2 and is used for preheating, heating and welding in the welding process, and the heating mechanism is not arranged in the vacuum cabin 3, so that the welding flux of the workpiece to be welded in the heating cabin 2 is in a molten state after being heated, the heating cabin 2 enters the vacuum cabin 3, the molten state of the heating mechanism is changed on the surface, so that a plurality of bubbles exist in the welding flux, the welding quality of a product is reduced, the heating mechanism in the embodiment penetrates through the vacuum cabin 3, the molten state of the welding flux can be maintained, and the bubbles in the welding flux are separated out through internal and external pressure differences, so that the welding quality of the product is improved.
Further, the heating mechanism penetrates through the cooling cabin 4, and the temperature in the cooling cabin 4 can be rapidly reduced through the fan assembly 24.
The temperature acquisition assembly comprises a plurality of temperature monitoring points 25 which are uniformly arranged in the temperature area in each cabin, the total temperature monitoring points 25 in each temperature area are the same in number, and each temperature monitoring point 25 is provided with a temperature acquisition element. Alternatively, the temperature acquisition element may be a temperature probe. In the process of conveying the workpiece to be welded by the tray, the temperature measuring probe contacts the workpiece to be welded so as to measure the temperature of the element when reaching the temperature monitoring point 25, and the temperature is stored and uploaded to the control system.
The heating cabin 2, the vacuum cabin 3 and the cooling cabin 4 together complete the whole process flows of preheating, heating, welding, reflow and cooling in the vacuum reflow welding process.
Further, the temperature of the element itself is detected by using the temperature measuring probe to contact the workpiece to be welded, and the temperature is more accurate than that of the conventional furnace thermometer in detecting the temperature in each cabin of the welding furnace, because the temperature in the furnace and the temperature of the welding element itself have to be different, for example, the temperature of the first cabin in the temperature-raising cabin 2 is set to 300 ℃, and the temperature of the element itself when the welding element is in the first cabin is slightly lower than 300 ℃.
Example 2
On the basis of embodiment 1, this embodiment further proposes a vacuum reflow soldering furnace, which further includes:
The vacuum auxiliary mechanism comprises a nitrogen charging assembly, and the nitrogen charging assembly is used for charging nitrogen into the heat insulation layer.
Specifically, traditional vacuum reflow soldering is that gas is directly filled into a cabin, but heat preservation cotton in a heat preservation layer is mixed with air, so that vacuumizing efficiency is affected, the heat preservation cotton is pumped out while air is blown out, and after nitrogen is added, vacuumizing efficiency is improved.
Example 3
Based on embodiment 1 and embodiment 2, this embodiment proposes a control method for a reflow soldering furnace temperature, please refer to fig. 1, which includes the following steps:
s1, acquiring workpiece parameters of a workpiece to be welded, and obtaining a temperature process curve corresponding to the workpiece parameters of the workpiece to be welded; the workpiece parameters at least comprise solder types and soldering thicknesses; the temperature process curve represents the target welding temperature of each temperature zone;
In particular, the workpiece parameters of the workpiece to be welded are known prior to welding. The solder categories include: tin, silver, gold, lead, indium, cadmium, bismuth, mercury, antimony, copper, gallium, zinc, and the like. The weld thickness is related to the shape of the weld, which includes: paste, tablet, sphere, etc.
Further, the abscissa of the temperature process curve is the number of each sub-cabin (temperature zone), and the ordinate is the target welding temperature.
S2, controlling the temperature of each temperature zone to be adjusted to the corresponding target welding temperature according to a temperature process curve corresponding to the workpiece parameters of the workpiece to be welded, and sending the workpiece to be welded into the reflow soldering furnace for soldering.
Optionally, each sub-tank in the warming-up tank 2 needs to be warmed up, and each sub-tank of the vacuum tank 3 and the cooling tank 4 needs to be cooled down in a gradient manner.
In a preferred embodiment, a temperature prediction model is adopted to obtain a temperature process curve corresponding to the workpiece parameters of the workpiece to be welded; the temperature prediction model is constructed by the following steps:
acquiring multiple groups of historical temperature data sets, wherein each group of historical temperature data set comprises workpiece parameters of a reference welding workpiece and a historical temperature sequence, and the historical temperature sequence comprises optimized welding temperatures of all temperature areas;
Specifically, the reference welding workpiece is a workpiece subjected to previous welding, and the optimized welding temperature can be understood as a welding temperature at which the welding quality of the welding workpiece is better.
And acquiring an initial network model, taking the workpiece parameters of the reference welding workpiece as input, taking the historical temperature sequence as output, and training the initial network model to obtain a temperature prediction model.
Specifically, the entire training process includes: the regression model is selected as an initial network model, a nonlinear regression model is established according to the characteristics of the related parameters, a cyclic neural network is adopted, a plurality of groups of training databases in the historical temperature dataset are used for training the model, and the model parameters are adjusted through a back propagation algorithm so as to minimize a loss function. Fitting a regression model: and using the regression model obtained through training, taking the temperature zone position as an independent variable, taking the target welding temperature as a dependent variable, and performing model fitting. Model evaluation: the goodness of fit of the regression model is evaluated, and the decision coefficients are used to measure the interpretation ability of the model to the data.
Further preferably, the multiple sets of historical temperature data sets are divided into a training set and a verification set, the performance of the model is monitored by using the verification set, new data is predicted by using the model after training is finished, and a prediction result is output.
Further preferably, a learning curve is drawn, and the learning condition of the model is observed through the change curves of the accuracy rate on the training set and the verification set along with the data quantity.
Model diagnosis: the residual errors of the model are checked, and the assumption and fitting quality of the model are ensured.
Further optimized is to use the mean square error as a function loss and to train with Adam optimizer.
If the residual error of the test model is too large, repeating training and learning of the data, automatically updating and storing the data after training and learning, and then returning to training the regression model;
Further, the reflow soldering furnace also comprises a visualization system, which is an upper computer control system compiled on the basis of configuration, and can present the temperature process curve and information acquired by other sensors in a screen mode; meanwhile, a parameter input panel is embedded in the data processing system to read, write and send the data to the processor and the controller.
In a preferred embodiment, the acquiring multiple sets of historical temperature data sets includes at least acquiring a historical temperature sequence of one set of the historical temperature data sets;
the acquiring a set of historical temperature sequences of the set of historical temperature data sets at least comprises the steps of:
Acquiring historical welding information corresponding to a plurality of welding workpiece samples with the same workpiece parameters of the reference welding workpieces of the set of historical temperature data sets, wherein the historical welding information at least comprises equipment information and workpiece information in a welding process, the equipment information at least comprises historical welding temperatures of all the temperature areas, and the workpiece information at least comprises welding quality grades;
Specifically, the historical welding temperature may be the temperature of each temperature zone in the control device when the welding workpiece is welded, or may be the temperature of the welding workpiece measured by each temperature measuring probe.
And selecting a welding workpiece sample with the welding quality grade being greater than or equal to a first preset grade, and taking the historical welding temperature of each temperature zone corresponding to the welding workpiece sample as the optimized welding temperature of each temperature zone in a historical temperature sequence corresponding to the reference welding workpiece of the set of historical temperature data sets.
Further, when the temperature of each temperature zone in the control device is used as the historical welding temperature during the welding of the welding workpiece, the temperature is directly used as the optimized welding temperature of the corresponding temperature zone.
If the temperature of the welding workpiece in each temperature zone is taken as the historical welding temperature, one-step conversion is needed, the conversion can be carried out through a conversion model, the input of the conversion model is the temperature of the welding workpiece, and the output is the temperature in the cabin.
Specifically, the welding quality grade may be evaluated by a void ratio, where the lower the void ratio, the higher the welding quality grade is proved, and in some embodiments, the void ratio is obtained by ultrasonic scanning microscope or X-ray scanning, and the scanning device outputs the void ratio after scanning the welded sample, where the void ratio has a one-to-one correspondence with the welding quality grade.
In a preferred embodiment, the acquiring historical welding information corresponding to a number of welding workpiece samples of the same workpiece parameters of the reference welding workpiece of the set of historical temperature data sets comprises at least the steps of:
The method comprises the steps of calling a welding history database, wherein the welding history database comprises a plurality of welding workpiece samples and history welding information corresponding to each welding workpiece sample;
Traversing the welding history database to obtain historical welding information of a plurality of welding workpiece samples corresponding to the workpiece parameter information of the reference welding workpiece of the set of historical temperature data sets, wherein the workpiece parameter information is the same as the workpiece parameter information of the reference welding workpiece.
In a preferred embodiment, a plurality of temperature monitoring points 25 are uniformly arranged in each temperature zone, and each temperature monitoring point 25 is provided with a temperature acquisition element; the method further comprises the steps of:
After receiving a start signal of a reflow soldering furnace, acquiring actual temperatures of workpieces entering the reflow soldering furnace at the temperature monitoring points 25;
averaging the actual temperatures at all the temperature monitoring points 25 in the same temperature zone to obtain a historical welding temperature of the temperature zone;
And acquiring the workpiece parameters of the workpiece and the welding quality grade of the workpiece after the welding is finished, taking the workpiece as a preparation workpiece sample, and storing the corresponding workpiece parameters, the welding quality grade after the welding is finished and the historical welding temperature in each temperature zone into a preparation database.
Specifically, the preliminary database also belongs to a part of the welding history database, and by setting a temperature acquisition element on each temperature monitoring point 25 to acquire the temperature data of each welding element entering the reflow soldering furnace in real time, the temperature data and the like can be stored in the preliminary database part of the welding history database, the welding history database is updated in real time, and a temperature prediction model can be optimized continuously according to the temperature data, so that the temperature process curve predicted by the temperature prediction model is more accurate, and the utilization rate of the conventional temperature data is improved.
In a preferred embodiment, after the obtaining the workpiece parameters of the workpiece and the welding quality level of the workpiece after the welding is completed, the method further comprises the following steps:
Judging whether the workpiece parameters of the workpiece have the matched welding workpiece samples in the welding history database;
after the workpiece is used as a prepared workpiece sample and the corresponding workpiece parameters and the welding quality grade after the welding is finished are stored in a prepared database, the method further comprises the following steps:
If the workpiece parameters of the workpiece have the matched welding workpiece samples in the welding history database, and the welding quality grade of the workpiece after the welding is finished is greater than that of the welding workpiece samples, taking the welding workpiece samples as failure samples;
And updating the historical welding information of the failure sample in the welding history database with the welding quality grade of the prepared workpiece sample and the historical welding temperature of each temperature zone.
Specifically, when a welding workpiece sample which is the same as the workpiece parameter of the current welding element is originally stored in the welding history database (except the area of the preparation database), if the welding quality grade of the current welding element is larger than the welding quality grade of the previous welding workpiece sample which is originally stored in the welding history database, the welding information of the current welding element is used for replacing the history welding information corresponding to the welding workpiece sample corresponding to the workpiece parameter in the welding history database, so that the samples with the same process parameter but lower welding quality grade in the past are replaced in real time, and the data reliability in the database can be effectively ensured.
Therefore, the welding workpiece samples stored in the welding history database can be guaranteed to be samples with better welding quality, and convenience can be provided for obtaining a temperature process curve through subsequent direct library adjustment and search.
In a preferred embodiment, after the workpiece to be welded is sent to the reflow soldering oven for soldering, the method further comprises the following steps:
when the workpiece to be welded reaches the first temperature monitoring point 25 in each temperature zone, collecting the first temperature of the workpiece to be welded at the first temperature monitoring point 25 in each temperature zone;
When the absolute value of the difference between the first temperature and the target welding temperature corresponding to the temperature zone is judged to be larger than or equal to a first preset threshold value, calculating the temperature adjustment quantity of the temperature zone;
and adjusting the target welding temperature of the temperature zone based on the temperature adjustment amount to obtain an updated welding temperature, and controlling the temperature zone to be adjusted to the updated welding temperature.
In this embodiment, considering that the workpiece to be welded reenters each temperature zone and does not reach the temperature required by welding, when the temperature on the first temperature monitoring point 25 is not reached, the adjustment is performed in time, the temperature of the workpiece is monitored in real time in the welding process, and when the temperature does not reach the standard, the temperature is dynamically adjusted in time, so that the welding process parameters can be adjusted in the welding process, the rejection rate of the welded product is reduced, and the welding quality is improved.
In a preferred embodiment, after said controlling the temperature zone to adjust to the updated welding temperature, the method further comprises the steps of:
collecting a second temperature of a next temperature monitoring point 25 of the first temperature monitoring point 25 of the workpiece to be welded in the temperature zone;
and when the absolute value of the difference between the second temperature and the updated welding temperature is larger than or equal to a second preset threshold value, a first early warning signal is sent out.
Specifically, if after the target welding temperature in the temperature zone is adjusted, when the second temperature of the next temperature monitoring point 25 still does not reach the temperature required for welding, it indicates that at least one of the heating mechanism or the control system of the reflow soldering furnace or the elements such as the temperature monitoring element is faulty, so that the soldering furnace cannot be used normally, and at this time, the first early warning signal is sent to remind the staff to check and repair the soldering furnace in time.
In a preferred embodiment, before the temperature prediction model is used to obtain the temperature process curve corresponding to the workpiece parameters of the workpiece to be welded, the method further includes the following steps:
the welding history database is called, and the workpiece parameters of the workpieces to be welded are matched with all the welding workpiece samples in the welding history database;
the temperature process curve corresponding to the workpiece parameters of the workpiece to be welded is obtained by adopting a temperature prediction model, and the method at least comprises the following steps:
And if the matched welding workpiece samples are not available, obtaining a temperature process curve corresponding to the workpiece parameters of the workpiece to be welded by adopting a temperature prediction model.
In a preferred embodiment, after matching the workpiece parameters of the workpiece to be welded with each of the welding workpiece samples in the welding history database, the method further comprises the steps of:
And if the matched welding workpiece samples are provided, and the welding quality grade of the matched welding workpiece samples is greater than or equal to a second preset grade, obtaining the temperature process curve based on the historical welding temperature of the welding workpiece samples in each temperature zone.
Further, the temperature process curve corresponding to the workpiece parameters of the workpiece to be welded can be obtained by calling the welding history database, and the method at least comprises the following steps:
Traversing the welding history database, and obtaining the temperature process curve based on the historical welding temperature of the welding workpiece sample in each temperature zone when the welding workpiece sample matched with the workpiece parameters of the workpiece to be welded is arranged in the welding history database and the welding quality grade of the matched welding workpiece sample is larger than or equal to a second preset grade;
the welding history database comprises a plurality of welding workpiece samples and history welding information corresponding to each welding workpiece sample, wherein the history welding information comprises workpiece parameters, welding quality grades and history welding temperatures in each temperature zone.
Specifically, if the welding workpiece sample having the same workpiece parameters as the workpiece to be welded is already stored in the welding history database, if the welding quality of the welding workpiece sample after the welding is completed is high, in order to reduce the calculation amount, the historical welding temperature of the welding workpiece sample in the welding history database in each temperature zone may be directly used as the target welding temperature corresponding to each temperature zone without inputting the workpiece parameters into the temperature prediction model.
The present embodiment provides a control means that can improve welding quality and reduce the amount of calculation.
The principles and embodiments of the present application have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present application and its core ideas. The foregoing is merely illustrative of the preferred embodiments of this application, and it is noted that there is objectively no limit to the specific structure disclosed herein, since numerous modifications, adaptations and variations can be made by those skilled in the art without departing from the principles of the application, and the above-described features can be combined in any suitable manner; such modifications, variations and combinations, or the direct application of the inventive concepts and aspects to other applications without modification, are contemplated as falling within the scope of the present application.
Claims (9)
1. A control method of reflow soldering furnace temperature, reflow soldering furnace includes several temperature areas sequentially along its extending direction; the control method is characterized by comprising the following steps:
Acquiring workpiece parameters of a workpiece to be welded, and obtaining a temperature process curve corresponding to the workpiece parameters of the workpiece to be welded; the workpiece parameters at least comprise solder types and soldering thicknesses; the temperature process curve represents the target welding temperature of each temperature zone;
and controlling the temperature of each temperature zone to be adjusted to the corresponding target welding temperature according to a temperature process curve corresponding to the workpiece parameters of the workpiece to be welded, and sending the workpiece to be welded into the reflow soldering furnace for soldering.
2. The method for controlling the temperature of a reflow soldering oven according to claim 1, wherein a temperature process curve corresponding to the workpiece parameter of the workpiece to be soldered is obtained by using a temperature prediction model; the temperature prediction model is constructed by the following steps:
acquiring multiple groups of historical temperature data sets, wherein each group of historical temperature data set comprises workpiece parameters of a reference welding workpiece and a historical temperature sequence, and the historical temperature sequence comprises optimized welding temperatures of all temperature areas;
And acquiring an initial network model, taking the workpiece parameters of the reference welding workpiece as input, taking the historical temperature sequence as output, and training the initial network model to obtain a temperature prediction model.
3. The method of controlling a reflow oven temperature of claim 2, wherein the acquiring a plurality of sets of historical temperature data sets includes at least acquiring a set of historical temperature sequences of the sets of historical temperature data;
the acquiring a set of historical temperature sequences of the set of historical temperature data sets at least comprises the steps of:
Acquiring historical welding information corresponding to a plurality of welding workpiece samples with the same workpiece parameters of the reference welding workpieces of the set of historical temperature data sets, wherein the historical welding information at least comprises equipment information and workpiece information in a welding process, the equipment information at least comprises historical welding temperatures of all the temperature areas, and the workpiece information at least comprises welding quality grades;
And selecting a welding workpiece sample with the welding quality grade being greater than or equal to a first preset grade, and taking the historical welding temperature of each temperature zone corresponding to the welding workpiece sample as the optimized welding temperature of each temperature zone in a historical temperature sequence corresponding to the reference welding workpiece of the set of historical temperature data sets.
4. A method of controlling a reflow oven temperature in accordance with claim 3, wherein the obtaining of historical weld information corresponding to a plurality of samples of the weld workpieces having the same workpiece parameters of the reference weld workpieces of the set of historical temperature datasets includes at least the steps of:
The method comprises the steps of calling a welding history database, wherein the welding history database comprises a plurality of welding workpiece samples and history welding information corresponding to each welding workpiece sample;
Traversing the welding history database to obtain historical welding information of a plurality of welding workpiece samples corresponding to the workpiece parameter information of the reference welding workpiece of the set of historical temperature data sets, wherein the workpiece parameter information is the same as the workpiece parameter information of the reference welding workpiece.
5. The method for controlling the temperature of a reflow soldering oven according to claim 4, wherein a plurality of temperature monitoring points (25) are uniformly arranged in each temperature zone, and each temperature monitoring point (25) is provided with a temperature acquisition element; the method further comprises the steps of:
After receiving a starting signal of a reflow soldering furnace, acquiring actual temperatures of workpieces entering the reflow soldering furnace at the temperature monitoring points;
Averaging the actual temperatures of all the temperature monitoring points in the same temperature zone to obtain the historical welding temperature of the temperature zone;
And acquiring the workpiece parameters of the workpiece and the welding quality grade of the workpiece after the welding is finished, taking the workpiece as a preparation workpiece sample, and storing the corresponding workpiece parameters, the welding quality grade after the welding is finished and the historical welding temperature in each temperature zone into a preparation database.
6. The method according to claim 5, wherein after the obtaining of the workpiece parameters of the workpiece and the welding quality level of the workpiece after the welding is completed, further comprising the steps of:
Judging whether the workpiece parameters of the workpiece have the matched welding workpiece samples in the welding history database;
after the workpiece is used as a prepared workpiece sample and the corresponding workpiece parameters and the welding quality grade after the welding is finished are stored in a prepared database, the method further comprises the following steps:
If the workpiece parameters of the workpiece have the matched welding workpiece samples in the welding history database, and the welding quality grade of the workpiece after the welding is finished is greater than that of the welding workpiece samples, taking the welding workpiece samples as failure samples;
And updating the historical welding information of the failure sample in the welding history database with the welding quality grade of the prepared workpiece sample and the historical welding temperature of each temperature zone.
7. The method of controlling the temperature of a reflow soldering oven according to claim 5, wherein after the work piece to be soldered is fed into the reflow soldering oven for soldering, further comprising the steps of:
when the workpiece to be welded reaches the first temperature monitoring point position (25) in each temperature zone, collecting the first temperature of the workpiece to be welded at the first temperature monitoring point position (25) of each temperature zone;
When the absolute value of the difference between the first temperature and the target welding temperature corresponding to the temperature zone is judged to be larger than or equal to a first preset threshold value, calculating the temperature adjustment quantity of the temperature zone;
and adjusting the target welding temperature of the temperature zone based on the temperature adjustment amount to obtain an updated welding temperature, and controlling the temperature zone to be adjusted to the updated welding temperature.
8. The method of controlling a reflow oven temperature of claim 7, wherein the controlling the temperature zone after adjusting to the updated solder temperature further includes the steps of:
collecting a second temperature of a next temperature monitoring point (25) of the first temperature monitoring point (25) of the workpiece to be welded in the temperature zone;
and when the absolute value of the difference between the second temperature and the updated welding temperature is larger than or equal to a second preset threshold value, a first early warning signal is sent out.
9. The method for controlling the temperature of a reflow soldering oven according to claim 4, wherein the step of obtaining a temperature process curve corresponding to the workpiece parameters of the workpiece to be soldered by retrieving a soldering history database, comprises at least the steps of:
Traversing the welding history database, and obtaining the temperature process curve based on the historical welding temperature of the welding workpiece sample in each temperature zone when the welding workpiece sample matched with the workpiece parameters of the workpiece to be welded is arranged in the welding history database and the welding quality grade of the matched welding workpiece sample is larger than or equal to a second preset grade;
the welding history database comprises a plurality of welding workpiece samples and history welding information corresponding to each welding workpiece sample, wherein the history welding information comprises workpiece parameters, welding quality grades and history welding temperatures in each temperature zone.
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