CN105486214A - Method for measuring heat processing seeping layer thickness - Google Patents
Method for measuring heat processing seeping layer thickness Download PDFInfo
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- CN105486214A CN105486214A CN201510926759.7A CN201510926759A CN105486214A CN 105486214 A CN105486214 A CN 105486214A CN 201510926759 A CN201510926759 A CN 201510926759A CN 105486214 A CN105486214 A CN 105486214A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
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- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
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Abstract
The invention discloses a method for measuring a heat processing seeping layer thickness. The method comprises the following steps: S1, selecting a test block for calibration, and measuring the seeping layer total thickness of the test block for calibration; S2, detecting the test block for calibration by use of an eddy current testing machine, and recording a signal total grid number from a seeping layer maximum depth to a non-seeping layer area; S3, according to the seeping layer total thickness of the test block for calibration and the signal total grid number, calculating a seeping layer depth represented by each signal grid number; S4, detecting a part to be detected by use of the eddy current testing machine, and recording the signal grid number of a seeping layer area; and S5, according to a seeping layer thickness represented by each signal and the signal grid number of the part to be detected, calculating the seeping layer thickness of the part to be detected. By using the measurement method provided by the invention, the heat processing seeping layer thickness can be rapidly and effectively detected, energy is saved, the production efficiency is improved, and the product quality is also improved. The method belongs to a typical energy conservation and emission reduction technology and conforms to national energy conservation and emission reduction requirements.
Description
Technical field
The invention belongs to material tests field, being specifically related to a kind of method for measuring thermal treatment alloying layer thickness.
Background technology
Infiltration layer is one of a kind of conventional steel surface intensifying method.Common infiltration layer technology has: carburizing, nitriding, boronising etc.Infiltration layer has excellent wearing quality, preferably corrosion stability and high temperature oxidation resistance.The steam piano part of such as drilling outfit, the mould such as punching press, wire drawing all improves serviceable life through infiltration layer thermal treatment.
The impact of thickness on its performance of infiltration layer is most important, and the Accurate Measurement of alloying layer thickness also affects the formulation of infiltration layer Technology for Heating Processing simultaneously, as temperature and time during infiltration layer.The method of testing of traditional alloying layer thickness is metallographic method and hardness method.Namely first workpiece in cross-sectional cut, grind metallographic sample and measure its diffusion layer organization or hardness gradient to judge the thickness of infiltration layer.The method not only the sample preparation time long, detection efficiency is low, but also destroy workpiece, cause scrapping of test piece.Simultaneously when infiltration layer local is uneven, due to the restriction of resample area, sample position can not fix on infiltration layer thinnest part, and the inadequate workpiece of depth of penetration may be made to be mistaken for qualified workpiece.Therefore, a kind of detection method of harmless test alloying layer thickness is found to have very high economy and social value.
To this, the invention discloses a kind of method detecting alloying layer thickness, directly can measure alloying layer thickness at complete surface of the work, eliminate the link of cutting and sample preparation, both saved the time, and improve production efficiency, additionally reduce scrapping of workpiece, belong to typical energy-conserving and emission-cutting technology.
Summary of the invention
The object of the present invention is to provide a kind of method for detecting alloying layer thickness.Adopt eddy current detecting equipment, the relation of alloying layer thickness and eddy current signal found out by establishing criteria sample, and the intensity qualifying number according to eddy current signal determines alloying layer thickness.Use the method can detect the alloying layer thickness of infiltration layer heat treated part rapidly and accurately, eliminate traditional cutting sample preparation link, both saved resource, the energy, and improve production efficiency, and improved product quality again.
For solving above-mentioned technical matters, the invention provides a kind of method for measuring thermal treatment alloying layer thickness, the method comprises the steps:
S1: choose demarcation test block, and the infiltration layer gross thickness (D) measuring demarcation test block;
S2: utilize eddy current test machine to detect demarcation test block, records from infiltration layer depth capacity to the total lattice number (N) of signal without infiltration layer region;
S3: the depth of penetration (h) calculating the representative of each signal lattice number according to the infiltration layer gross thickness (D) of demarcation test block and signal total lattice number (N), its computing formula is h=D/N;
S4: utilize eddy current test machine to detect UUT, record signal lattice number (n) in its infiltration layer region;
S5: the depth of penetration (h) represented according to each signal and signal lattice number (n) of UUT calculate the alloying layer thickness (d) of the UUT of UUT, and its computing formula is d=h × n.
Further, the infiltration layer gross thickness (D) of the demarcation test block in described step S1 measures alloying layer thickness by metaloscope tissues observed or microhardness testers, then carries out demarcating.
Further again, the infiltration layer type of described demarcation test block and the infiltration layer type matching of UUT.
Further again, the infiltration layer type of described demarcation test block has boride layer demarcation test block, cementation zone demarcation test block and nitriding layer demarcation test block.
The measuring method of the application of the invention, can effectively detect thermal treatment alloying layer thickness fast, avoid traditional metallographic method and hardness method, both save the energy, improve production efficiency, improve product quality again, belong to typical energy-conserving and emission-cutting technology, meet national energy-saving and reduce discharging requirement.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is process chart of the present invention.
Embodiment
As shown in Figure 1, the invention provides a kind of method for measuring thermal treatment alloying layer thickness, it is characterized in that: the method comprises the steps:
S1: choose demarcation test block, and the infiltration layer gross thickness (D) measuring demarcation test block;
S2: utilize eddy current test machine to detect demarcation test block, records from infiltration layer depth capacity to the total lattice number (N) of signal without infiltration layer region;
S3: the depth of penetration (h) calculating the representative of each signal lattice number according to the infiltration layer gross thickness (D) of demarcation test block and signal total lattice number (N), its computing formula is h=D/N;
S4: utilize eddy current test machine to detect UUT, record signal lattice number (n) in its infiltration layer region;
S5: the depth of penetration (h) represented according to each signal and signal lattice number (n) of UUT calculate the alloying layer thickness (d) of the UUT of UUT, and its computing formula is d=h × n.
The infiltration layer gross thickness (D) of the demarcation test block in above-mentioned steps S1 is demarcated by metaloscope or sclerometer.
The infiltration layer type of above-mentioned demarcation test block and the infiltration layer type matching of UUT.
The infiltration layer type of above-mentioned demarcation test block has boride layer demarcation test block, cementation zone demarcation examination and nitriding layer demarcation test block.
Adopt the Measuring Time of said method: the preparation time of mainly demarcation test block, but when measurement number of packages is more, the preparation time of demarcation test block is almost negligible, and the detection time of a workpiece is no more than 3 minutes.
Measure cost: without other loss any except equipment amortization expense.
As a comparison, traditional metallographic method and hardness method is adopted to measure alloying layer thickness.Comprise: sample cutting, the grinding of metallographic specimen, the corrosion of sample, metaloscope tissues observed, microhardness testers are tested.
Measuring Time: 30 minutes clipping times of sample, 30 minutes grind away time.10 minutes observing times, survey 10 minutes hardness time.Metallographic method or hardness method need about 70 minutes time.
Measure cost: the consumptive materials such as cutting blade, abrasive paper for metallograph, nitric acid alcohol, the amortization charge of metaloscope or microhardness testers.
As can be seen from above correlation data, under the prerequisite that power consumption is lower and the used time is less, this method can obtain the measurement result identical with traditional metallographic method or hardness method on alloying layer thickness.In addition, traditional metallographic method and hardness method measure certain point on workpiece, and this method measures whole workpiece, and measurement result more comprehensively accurately.
When selecting cementation zone demarcation test block and nitriding layer demarcation test block, consistent with metallographic method measurement result with the alloying layer thickness of eddy-current method measurement after carburizing, Nitrizing Treatment.
When selecting boride layer demarcation test block, because pre-treatment is unclean during Bononizing pretreatment, infiltration layer has soft spots, due to sample preparation position, metallographic method is measured and is not found, after finding soft spots with eddy-current method test, with metallographic method in the cutting sample preparation of eddy current test soft spots place, the testing result of eddy-current method is confirmed.
In sum, the measuring method of the application of the invention, can effectively detect thermal treatment alloying layer thickness fast, avoid traditional metallographic method and hardness method.Both saved the energy, improve production efficiency, improved product quality again, belonged to typical energy-conserving and emission-cutting technology, and met national energy-saving and reduce discharging requirement.
Claims (4)
1., for measuring a method for thermal treatment alloying layer thickness, it is characterized in that: the method comprises the steps:
S1: choose demarcation test block, and the infiltration layer gross thickness (D) measuring demarcation test block;
S2: utilize eddy current test machine to detect demarcation test block, records from infiltration layer depth capacity to the total lattice number (N) of signal without infiltration layer region;
S3: the depth of penetration (h) calculating the representative of each signal lattice number according to the infiltration layer gross thickness (D) of demarcation test block and signal total lattice number (N), its computing formula is h=D/N;
S4: utilize eddy current test machine to detect UUT, record signal lattice number (n) in its infiltration layer region;
S5: the depth of penetration (h) represented according to each signal and signal lattice number (n) of UUT calculate the alloying layer thickness (d) of the UUT of UUT, and its computing formula is d=h × n.
2. a kind of method for measuring thermal treatment alloying layer thickness according to claim 1, it is characterized in that: the infiltration layer gross thickness (D) of the demarcation test block in described step S1 measures alloying layer thickness by metaloscope tissues observed or microhardness testers, then carry out demarcating.
3. a kind of method for measuring thermal treatment alloying layer thickness according to claim 1, is characterized in that: the infiltration layer type of described demarcation test block and the infiltration layer type matching of UUT.
4., according to the arbitrary a kind of described method for measuring thermal treatment alloying layer thickness of claim 1 or 3, it is characterized in that: the infiltration layer type of described demarcation test block has boride layer demarcation test block, cementation zone demarcation test block and nitriding layer demarcation test block.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108267502A (en) * | 2016-12-30 | 2018-07-10 | 大众汽车自动变速器（大连）有限公司 | The eddy detection system and detection method of case depth |
| CN109187731A (en) * | 2018-08-13 | 2019-01-11 | 合肥通用机械研究院有限公司 | A kind of carburization detection method of HK-40 Tube at Hydrogen Reformer reinforced joint |
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| CN104060218A (en) * | 2014-06-30 | 2014-09-24 | 中国南方航空工业(集团)有限公司 | Aluminizing technology method for blade |
| CN104865310A (en) * | 2015-06-29 | 2015-08-26 | 中国矿业大学 | Gear and shaft part carburization depth pulse eddy current detection apparatus and gear and shaft part carburization depth pulse eddy current detection method |
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Patent Citations (6)
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| JPH03189503A (en) * | 1989-12-14 | 1991-08-19 | General Electric Co <Ge> | Apparatus and method for measuring thick- ness of coating |
| CN2090042U (en) * | 1991-01-19 | 1991-12-04 | 汤世国 | Chemical heat treatment workpiece permeable layer thickness measurer |
| US20070001670A1 (en) * | 2005-06-30 | 2007-01-04 | Bailey Andrew D Iii | Methods and apparatus for optimizing an electrical response to a set of conductive layers on a substrate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108267502A (en) * | 2016-12-30 | 2018-07-10 | 大众汽车自动变速器（大连）有限公司 | The eddy detection system and detection method of case depth |
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| CN109187731A (en) * | 2018-08-13 | 2019-01-11 | 合肥通用机械研究院有限公司 | A kind of carburization detection method of HK-40 Tube at Hydrogen Reformer reinforced joint |
| CN109187731B (en) * | 2018-08-13 | 2021-08-31 | 合肥通用机械研究院有限公司 | A kind of carburizing detection method for strengthening joints of hydrogen-producing reformer tubes |
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Inventor after: Bo Mingzhe Inventor after: Shi Hongqi Inventor before: Shi Hongqi |