CN104677503A - Method for monitoring laser melting pool in real time - Google Patents
Method for monitoring laser melting pool in real time Download PDFInfo
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- CN104677503A CN104677503A CN201310643707.XA CN201310643707A CN104677503A CN 104677503 A CN104677503 A CN 104677503A CN 201310643707 A CN201310643707 A CN 201310643707A CN 104677503 A CN104677503 A CN 104677503A
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Abstract
The invention discloses a method for monitoring a laser melting pool in real time and relates to the technical field of temperature monitoring in a laser re-melting process. A device for realizing the method comprises a bracket, an infrared probe, an alarming device and a control box, wherein the bracket is arranged on a main shaft; the infrared probe used for acquiring temperature information of the laser melting pool and the alarming device are arranged on the bracket; the control box is used for processing the temperature information acquired by the infrared probe and is provided with a displayer; a control circuit is arranged in the control box, is connected with a power switch of a temperature field through a relay and comprises a central controller, and a measured temperature analytical model displayer, a data storage module, a communication module and a power module which are respectively connected with the central controller; the communication module is connected with an upper computer. The method has the advantage that great convenience is brought to the acquisition and analysis of the temperature field in the laser re-melting process.
Description
Technical field
The present invention relates to temperature monitoring technique field in laser re-melting process, specifically a kind of laser molten pool method for real-time monitoring.
Background technology
Inevitably molten bath is produced in laser re-melting process, the differentiation in temperature field determines the heat and mass in laser molten pool, and then directly had influence on the surface quality etc. of the tissue of the shape in molten bath, coating and matrix, performance, part, therefore in laser re-melting process, the measurement and detection in temperature field is most important.
In current laser re-melting process, the measurement in temperature field is all generally detect several fixing point by thermoelectricity is occasionally artificial by infrared thermometer, then analyzing and processing is carried out, final experimental result has certain error, and intuitively can not reflect the real-time change of temperature in whole reflow process.
Summary of the invention
In order to solve the shortcoming of above-mentioned prior art, the invention provides a kind of laser molten pool method for real-time monitoring, in laser re-melting process, the temperature variation in molten bath can be monitored continuously, and show the temperature information in molten bath in real time.
The present invention realizes with following scheme: a kind of laser molten pool method for real-time monitoring, comprises one and is arranged on support on main shaft, support is provided with the infrared probe for gathering laser molten pool temperature information and warning device, the temperature information gathered for the treatment of infrared probe and with the control box of display, control box inside is provided with control circuit, control circuit connects the power switch in temperature field by relay, described control circuit comprises a central controller, the thermometric analysis mould display be connected with central controller respectively, data memory module, communication module and power module, communication module connects a host computer, concrete method for supervising is: utilize main infrared probe to carry out point by point scanning sampling to laser molten pool, the auxiliary sample information of infrared probe to main infrared probe compensates simultaneously, reduce the generation of error, the signal that two infrared probes are measured all amplifies through thermometric analysis module, filtering, temperature compensation, central processing unit is sent to after the information processings such as A/D conversion, form by image after central processing unit computational analysis shows over the display, and data are sent into memory module backup, laboratory technician can clearly observe temperature variation in laser re-melting process by display, be convenient to staff read, replace pointwise thermometric in the past, the mode of analyzing and processing again, great convenience is brought to the acquisition in temperature field in laser re-melting process and analyzing and processing, warning device is started in limited time on temperature exceedes, close laser molten pool power supply simultaneously.
The invention has the beneficial effects as follows: integrated level is high, volume is little, cost is low, the existing machinery structure of laser instrument and numerically-controlled machine need not be changed, be directly installed on spindle nose with regard to the temperature variation in the successional detection welding process of energy, replace pointwise thermometric in the past, then the mode of analyzing and processing, bring great convenience to the acquisition in laser re-melting process temperature field and analyzing and processing.
accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is described in more detail.
Fig. 1 is structural representation of the present invention;
Fig. 2 is infrared probe structural representation;
Fig. 3 is infrared probe installation site schematic diagram;
Fig. 4 is control circuit schematic diagram.
In figure: 1, main shaft; 2, infrared probe; 3, laser molten pool; 4, control box; 5, support, 51, half circular boop, 52, boom.
Embodiment
As shown in Figure 1, a kind of laser molten pool method for real-time monitoring has one to be arranged on support 5 on main shaft; Support 5 is provided with the infrared probe 2 for gathering laser molten pool temperature information and warning device; The temperature information gathered for the treatment of infrared probe and with the control box 4 of display, control box 4 inside is provided with control circuit, control circuit connects the power switch in temperature field by relay; Described control circuit comprises a central controller, the thermometric analysis mould display, data memory module, communication module and the power module that are connected with central controller respectively,
As shown in Figure 2, described infrared probe 2 is made up of lens 21, optical filter 22, chopper wheel 23, temperature compensation sensor 24, photoelectric sensor 25 and motor 26.Temperature due to laser re-melting process generally is the high temperature of more than hundreds of degree, is the near infrared light within the scope of 0.75 ~ 3um with wavelength, so lens material is generally optical glass and quartz etc.Motor work drives chopper wheel to rotate, tested infrared radiation is modulated into the infrared radiation of alternation, far infrared radiation can be transformed to electric signal by photoelectric sensor by infrared temperature measurement apparatus, export to thermometric analysis module to process, simultaneous temperature compensation sensor is also fixed in infrared probe for detection signal.
As shown in Figure 3, described infrared probe 2 has two, and one of them is the main infrared probe for carrying out point by point scanning sampling to molten bath, and another is the auxiliary infrared probe compensated the sample information of main infrared probe; Two infrared probes 2 are in same level.Main infrared probe and auxiliary infrared probe will be in same level, and extended line just to laser molten pool, and will ensure that position is adjustable, to guarantee the accurate measurement of temperature.
Described support 5 comprises two half symmetrical circular boops 51, and each half circular boop installs a boom 52 on 51; An infrared probe 2 is installed in the bottom of each boom 52.
As shown in Figure 4, described control circuit comprises a central controller, and the thermometric analysis mould module, display, data memory module, communication module and the power module that are connected with central controller respectively, communication module connects a host computer.
Thermometric analysis module: the information transmitted by two infrared probes carries out amplifying, filtering, temperature compensation process, A/D transforms, thus produces the acceptable Transistor-Transistor Logic level pulse of central processing unit.
Central controller: the core position of whole device, the computational analysis process mainly carrying out data is compared, and determines the final thetagram exported.
Display: for showing temperature value and the temperature changing curve diagram of whole process.
Data memory module: for storing the data of whole process, carry out data backup.
Communication module: be directly connected with host computer, can be carried out more comprehensively by host computer, more carefully, more deep analyzing and processing work.
Power module: provide power supply to above each module.
Host computer is used for long-range enforcement manipulation temperature field equipment and uses.
Described thermometric analysis module comprises amplifying unit, the filter unit be connected with amplifying unit, the synchronous detection unit be connected with filter unit, the multivibrator be connected with synchronous detection unit, the totalizer be connected with synchronous detection unit, the A/D converter be connected with totalizer, the temperature compensation unit be connected with totalizer; Described temperature compensation unit is connected with the temperature compensation sensor in infrared probe, and described amplifying unit is connected with the Electrophotosensitive original paper in infrared probe.Amplifying unit selects integrated transporting discharging as analogue amplifier, and amplifier works in linear amplification region, relation is one to one there is between the output of circuit and input, feedback signal delivers to input end by feedback resistance, namely utilize the variable quantity of voltage itself to play automatic corrective action by feedback network to amplifying circuit, finally reach and amplify and the effect of regulated output voltage; Filter unit adopts the active filter of integrated transporting discharging composition, and being made up of two joint RC filtering circuits and anti-phase scaling circuit, the input impedance of open-loop voltage gain is very high, and output impedance is lower, and has certain voltage amplification and buffer action; Temperature compensation unit adopts diode temperature compensating circuit, and when utilizing semiconductor to be subject to the stimulation of extraneous light and heat, its marked change will occur its electric conductivity, by the temperature compensation signal of diode through differential amplify with the impact of compensate for ambient temperature.Remaining element is also all more common circuit.
The course of work: this device is directly installed on main shaft 1 head, main infrared probe is utilized to carry out point by point scanning sampling to laser molten pool 3, the auxiliary sample information of infrared probe to main infrared probe compensates simultaneously, reduce the generation of error, the signal that two infrared probes are measured all amplifies through thermometric analysis module, filtering, temperature compensation, central processing unit is sent to after the information processings such as A/D conversion, form by image after central processing unit computational analysis shows over the display, and data are sent into memory module backup, laboratory technician can clearly observe temperature variation in laser re-melting process by display, be convenient to staff read, replace pointwise thermometric in the past, the mode of analyzing and processing again, great convenience is brought to the acquisition in temperature field in laser re-melting process and analyzing and processing, warning device is started in limited time on temperature exceedes, close laser molten pool power supply simultaneously.
In experiment is carried out or after experiment, can be connected with host computer by communication module process just now observed repeatedly, fix a point to analyze, the operation such as the analyzing and processing in temperature field, better, sooner, temperature field result can be drawn more accurately.
Claims (4)
1. a laser molten pool method for real-time monitoring, is characterized in that: comprise one and be arranged on support (5) on main shaft, support (5) is provided with the infrared probe (2) for gathering laser molten pool temperature information and warning device, the temperature information gathered for the treatment of infrared probe and with the control box (4) of display, control box (4) inside is provided with control circuit, control circuit connects the power switch in temperature field by relay, described control circuit comprises a central controller, the thermometric analysis mould display be connected with central controller respectively, data memory module, communication module and power module, communication module connects a host computer, concrete method for supervising is: utilize main infrared probe to carry out point by point scanning sampling to laser molten pool, the auxiliary sample information of infrared probe to main infrared probe compensates simultaneously, reduce the generation of error, the signal that two infrared probes are measured all amplifies through thermometric analysis module, filtering, temperature compensation, central processing unit is sent to after the information processings such as A/D conversion, form by image after central processing unit computational analysis shows over the display, and data are sent into memory module backup, laboratory technician can clearly observe temperature variation in laser re-melting process by display, be convenient to staff read, replace pointwise thermometric in the past, the mode of analyzing and processing again, great convenience is brought to the acquisition in temperature field in laser re-melting process and analyzing and processing, warning device is started in limited time on temperature exceedes, close laser molten pool power supply simultaneously.
2. laser molten pool method for real-time monitoring according to claim 1, is characterized in that: described infrared probe (2) is made up of lens (21), optical filter (22), chopper wheel (23), temperature compensation sensor (24), photoelectric sensor (25) and motor (26).
3. laser molten pool method for real-time monitoring according to claim 1, it is characterized in that: described infrared probe (2) has two, one of them is the main infrared probe for carrying out point by point scanning sampling to molten bath, and another is the auxiliary infrared probe compensated the sample information of main infrared probe; Two infrared probes (2) are in same level.
4. the laser molten pool method for real-time monitoring according to any one of claim 1-3, is characterized in that: described support (5) comprises two symmetrical half circular boops (51), (51) upper installation one boom (52) on each half circular boop; An infrared probe (2) is installed in the bottom of each boom (52).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310643707.XA CN104677503A (en) | 2013-12-03 | 2013-12-03 | Method for monitoring laser melting pool in real time |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310643707.XA CN104677503A (en) | 2013-12-03 | 2013-12-03 | Method for monitoring laser melting pool in real time |
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| CN104677503A true CN104677503A (en) | 2015-06-03 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017005205A1 (en) * | 2015-07-07 | 2017-01-12 | 沈阳富创精密设备有限公司 | Arc welding connection adjustment device for weld pool temperature measurement |
| CN106546336A (en) * | 2015-09-21 | 2017-03-29 | 伊诺家有限公司 | Temperature guards against sensor unit |
| CN107123257A (en) * | 2017-06-02 | 2017-09-01 | 合肥同佑电子科技有限公司 | A kind of infrared control power switch system |
| CN108941939A (en) * | 2017-07-12 | 2018-12-07 | 温州大学激光与光电智能制造研究院 | Closed loop laser processing quality control method based on molten bath splashing detection |
| CN110736545A (en) * | 2018-07-20 | 2020-01-31 | 大族激光科技产业集团股份有限公司 | laser head temperature monitoring device and method |
| CN113009940A (en) * | 2021-02-24 | 2021-06-22 | 沈阳工业大学 | Laser cladding molten pool temperature control system and method |
-
2013
- 2013-12-03 CN CN201310643707.XA patent/CN104677503A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017005205A1 (en) * | 2015-07-07 | 2017-01-12 | 沈阳富创精密设备有限公司 | Arc welding connection adjustment device for weld pool temperature measurement |
| CN106546336A (en) * | 2015-09-21 | 2017-03-29 | 伊诺家有限公司 | Temperature guards against sensor unit |
| CN107123257A (en) * | 2017-06-02 | 2017-09-01 | 合肥同佑电子科技有限公司 | A kind of infrared control power switch system |
| CN108941939A (en) * | 2017-07-12 | 2018-12-07 | 温州大学激光与光电智能制造研究院 | Closed loop laser processing quality control method based on molten bath splashing detection |
| CN108941939B (en) * | 2017-07-12 | 2020-04-07 | 温州大学激光与光电智能制造研究院 | Closed-loop laser processing quality control method based on molten pool splash detection |
| CN110736545A (en) * | 2018-07-20 | 2020-01-31 | 大族激光科技产业集团股份有限公司 | laser head temperature monitoring device and method |
| CN113009940A (en) * | 2021-02-24 | 2021-06-22 | 沈阳工业大学 | Laser cladding molten pool temperature control system and method |
| CN113009940B (en) * | 2021-02-24 | 2022-06-24 | 沈阳工业大学 | Laser cladding molten pool temperature control system and method |
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Application publication date: 20150603 |