CN103361474A - On-line detection method for laser quenching process by directly calibrating and detecting temperature field phase-change region with test sample - Google Patents
On-line detection method for laser quenching process by directly calibrating and detecting temperature field phase-change region with test sample Download PDFInfo
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- CN103361474A CN103361474A CN2012101034720A CN201210103472A CN103361474A CN 103361474 A CN103361474 A CN 103361474A CN 2012101034720 A CN2012101034720 A CN 2012101034720A CN 201210103472 A CN201210103472 A CN 201210103472A CN 103361474 A CN103361474 A CN 103361474A
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Abstract
The invention particularly relates to a real-time on-line detection method for a laser surface quenching process. The traditional on-line detection method needs a special metering mechanism to calibrate the instrument, which increases the expenses and is very inconvenient. The invention provides an on-line detection method for a laser quenching process by directly performing calibration by comparing a test sample with information acquired in a testing process. In the test calibration process, people only determine the proportional relation between the actual quenching region of the test sample and the corresponding region in the detected information, and does not determine the definite phase-change temperature of the workpiece. In the detection process, the system acquires information on the range of the phase-change range on the workpiece surface, and the accurate temperature value and distribution thereof are not required. The invention can be used for avoiding some calibration work performed by the professional metering mechanism, detection errors caused by temperature calibration errors, and misjudgment caused by variations of actual phase-change temperature and the like due to variations of materials or technological conditions.
Description
Technical field
The present invention relates to a kind of online test method, specifically, relate to a kind of method of the laser surface hardening process being carried out the real-time online detection.
Background technology
Laser surface hardening technique can efficient hardening workpiece surface, improve workpiece work-ing life.Because the situation on work material surface is different, just so that in the laser surface hardening process, material surface is different to the specific absorption of laser, if processing parameter is constant, the hardenability band width of material surface is just different with the degree of depth after the processing for these; In addition, for the workpiece of complicated structure, the thermal conduction condition of different sites is different, causes LASER HEATING and the width that undergoes phase transition is different with the degree of depth, etc.The performance of these problems affect workpiece surface.
The measure that addresses these problems is that the laser surface hardening process is carried out real-time online control.At present, the idea that people are general is real-time online detection laser hard surfacing state, obtains the status flag data, according to the real-time adjusting process parameter of the status flag data that detect, to improve and stable workpiece quality.Generally need prior process to the demarcation of detecting instrument, could the acknowledgement state characteristic.But because the workpiece material is different, the temperature that undergoes phase transition is also different, and radiation signal is also different under uniform temp; Processing condition are different, and are also different to the superheating temperature of austenitic transformation; In addition, sensor is different to the condition that workpiece surface detects, and the signal power that sensor receives also changes.The original as-heat-treated condition of workpiece also has some impacts.Therefore, before every kind of workpiece laser hard surfacing process detected, all need to special metering mechanism instrument to be demarcated; If processing condition change, also need to special metering mechanism instrument to be demarcated, need cost more human and material resources and financial resources, also very inconvenient, greatly restricted applying of laser surface hardening technique.
Summary of the invention
In order to address the above problem, effectively realize the laser surface hardening process is carried out real-time online control, the present invention proposes a kind of laser quenching process online test method that compares demarcation by testing the information of obtaining in and the test direct with sample.
The technical scheme of patent of the present invention is: for certain workpiece material and testing conditions, carry out laser surface hardening and process thereof and detect online test, the detection information direct and corresponding the features relevant data of sample compares, with calibration process detect the data area and and actual quenching zone between proportionlity, on this basis workpiece laser hard surfacing process is carried out real-time online and detect the needed data of Real-time Obtaining process control.
When process detected, what people often at first considered was to detect to such an extent that whether data are accurate, and had ignored the real purpose that detects.So people are general to carry out the accuracy demarcation in special metering mechanism to detecting instrument first, and then with going to measure through the detecting instrument of demarcating, expectation is detected data accurately.Yet, often can not obtain in practice or can not often obtain easily accurately data.In addition, the data that generally are used for technological process control often are not the absolute values of the information that detects, need to carry out analytical calculation, perhaps are exactly a relative value.In the laser surface hardening process, what need to know is the zone that workpiece surface undergoes phase transition, and therefore, only needs to obtain the information of the above scope of transformation temperature in the detection information, and does not require and obtain accurately temperature value and distribution thereof.This is from people are different with the purpose of the true temperature of instrument detection workpiece surface usually.
Because the present invention need to not detect accurately temperature value and distribution thereof in technological process, do not need to determine the represented definite temperature of detection information, thereby when Experimental Calibration, do not need to understand really cut temperature of workpiece material, only need to determine data area corresponding with actual quenching phase change region in the information data that detects and proportionlity between the two.
The beneficial effect of patent of the present invention is: the purpose that in abstracto relative process is detected has an important breakthrough, is that purpose changes that to obtain useful data be purpose into from obtaining accurate data; Can avoid changing because of physical conditions such as material, workpiece states the staking-out work of the professional metering mechanism that causes; Can avoid the detection error that causes because of the temperature calibration error, what is more important can avoid variation because of the actual chemical composition of material or processing condition to cause the thermophysical parameter such as actual transformation temperature to change the erroneous judgement that causes.
Description of drawings
Without accompanying drawing.
Embodiment
Before workpiece is carried out laser surface hardening, elder generation uses the test block the same with the workpiece material to carry out laser surface hardening under specified criteria and process detects test online, acquisition process detects information and corresponding quenching sample online, then directly compare with the detection information that obtains with corresponding test-results, the data area that detects with calibration process and and corresponding actual quenching zone between proportionlity, use again this calibration result as foundation, the design Some Related Algorithms, workpiece laser hard surfacing process is carried out real-time online detect the needed data of Real-time Obtaining process control.
Claims (3)
1. one kind is carried out the method that real-time online detects to the laser surface hardening process, can detect in real time the status flag information of quenching process, it is characterized in that: the transformation temperature zone of directly demarcating detection information with sample.
2. laser surface hardening process according to claim 1 is carried out the method that real-time online detects, its feature also has: when Experimental Calibration, only determine data area corresponding with reality quenching zone in the information data that detects and proportionlity between the two, do not need to understand really cut temperature of workpiece material.
3. laser surface hardening process according to claim 1 is carried out the method that real-time online detects, its feature also has: when process detects, the system acquisition workpiece surface is in the information of the above scope of transformation temperature, and does not require and obtain accurately temperature value and distribution thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101034720A CN103361474A (en) | 2012-04-10 | 2012-04-10 | On-line detection method for laser quenching process by directly calibrating and detecting temperature field phase-change region with test sample |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101034720A CN103361474A (en) | 2012-04-10 | 2012-04-10 | On-line detection method for laser quenching process by directly calibrating and detecting temperature field phase-change region with test sample |
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| CN103361474A true CN103361474A (en) | 2013-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012101034720A Pending CN103361474A (en) | 2012-04-10 | 2012-04-10 | On-line detection method for laser quenching process by directly calibrating and detecting temperature field phase-change region with test sample |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907566A (en) * | 2017-12-11 | 2018-04-13 | 中钢集团邢台机械轧辊有限公司 | A kind of test method for predicting metal material laser hardening depth |
| CN111579107A (en) * | 2020-05-13 | 2020-08-25 | 中国航发北京航空材料研究院 | Blade high-temperature vacuum heat treatment load temperature field and cold velocity field measuring method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1403822A (en) * | 2002-09-26 | 2003-03-19 | 浙江大学 | In-situ detection of product quality index in Chinese medicine production process |
| CN201924041U (en) * | 2010-11-23 | 2011-08-10 | 湖南大学 | Device for detecting laser surface strengthening process |
-
2012
- 2012-04-10 CN CN2012101034720A patent/CN103361474A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1403822A (en) * | 2002-09-26 | 2003-03-19 | 浙江大学 | In-situ detection of product quality index in Chinese medicine production process |
| CN201924041U (en) * | 2010-11-23 | 2011-08-10 | 湖南大学 | Device for detecting laser surface strengthening process |
Non-Patent Citations (1)
| Title |
|---|
| 杨彩霞等: "激光淬火过程实时检测系统的设计", 《激光技术》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907566A (en) * | 2017-12-11 | 2018-04-13 | 中钢集团邢台机械轧辊有限公司 | A kind of test method for predicting metal material laser hardening depth |
| CN111579107A (en) * | 2020-05-13 | 2020-08-25 | 中国航发北京航空材料研究院 | Blade high-temperature vacuum heat treatment load temperature field and cold velocity field measuring method |
| CN111579107B (en) * | 2020-05-13 | 2022-03-15 | 中国航发北京航空材料研究院 | Blade high-temperature vacuum heat treatment load temperature field and cold velocity field measuring method |
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Application publication date: 20131023 |