CN102706953A - Rapid detection method for stress concentration of heat-treated workpiece - Google Patents
Rapid detection method for stress concentration of heat-treated workpiece Download PDFInfo
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- CN102706953A CN102706953A CN2012101714245A CN201210171424A CN102706953A CN 102706953 A CN102706953 A CN 102706953A CN 2012101714245 A CN2012101714245 A CN 2012101714245A CN 201210171424 A CN201210171424 A CN 201210171424A CN 102706953 A CN102706953 A CN 102706953A
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Abstract
The invention discloses a rapid detection method for stress concentration of a heat-treated workpiece, which comprises the following steps as follows: (1) carrying out heat treatment on the workpiece to be tested; (2) carrying out demagnetization treatment on the heat-treated workpiece; (3) carrying out self-emission magnetic signal measurement on the treated heat-treated workpiece; (4) calculating the measurement result, if the self-emission magnetic signal numerical value on certain test points of the workpiece are apparently higher than the average value, determining the stress concentration position according to the test points; and (5) judging and marking the stress concentration position and stress on the workpiece according to the test result. According to the invention, the stress concentration position and stress of the heat-treated workpiece can be rapidly measured, the operation is convenient and simple, and the result is easy to judge.
Description
Technical field
The present invention relates to a kind of method for quick, particularly relate to the method for quick that a kind of heat treated part stress is concentrated.
Background technology
Stress is concentrated the phenomenon be meant stressed workpiece the subrange internal stress that causes enlarges markedly because extraneous factor or self geometric configuration, physical dimension are suddenlyd change.Stress is concentrated and can be caused the material fracture; Make workpiece produce fatigue crack, therefore in engineering design, be necessary to detect the stress of workpiece is concentrated.
Stress concentrates the main unrelieved stress tester that adopts to measure at present, but this method test is inconvenient, and speed is slow, causes its use commercial production person to be restricted.For heat treated part; Present also few people remove to test its stress and concentrate; Mainly be because there is not ripe method of testing at present; And the method that adopt to detect normal defect is position and the degree that can't confirm that stress is concentrated, but stress concentrates and can bring out crack Propagation and cause workpiece to lose efficacy, and brings tremendous loss for commercial production and the people's lives and property.
Summary of the invention
Technical matters to be solved by this invention provides the method for quick that a kind of heat treated part stress is concentrated, and it can measure the stress concentrated position and the size of workpiece after the thermal treatment fast, and easy to operate simple, and the result is easy to pass judgment on.
The present invention solves above-mentioned technical matters through following technical proposals: the method for quick that a kind of heat treated part stress is concentrated is characterized in that it may further comprise the steps:
One, workpiece is heat-treated;
Two, to the processing of demagnetizing of the workpiece after the thermal treatment;
Three,, carry out the self-emission magnetic signal and measure to the heat treated part after handling;
Four, calculate measurement result,, then confirm the position that stress is concentrated according to the position of these test points if the numerical value of self-emission magnetic signal is apparently higher than mean value on the position of said some test point of workpiece;
Five, identify position and the size that stress is concentrated according to the test result judgement and at workpiece.
Preferably, said heat treated part is a ferromagnetic workpiece.
Preferably, said thermal treatment comprises quenching and annealing in process.
Preferably, adopting TSC-1M-4 type magnetic memory detector to carry out said self-emission magnetic signal measures.Further preferably, said self-emission magnetic signal is measured and is specifically comprised: 1) workpiece is placed on the non-magnetic object and with said magnetic memory detector and return to zero; 2) method of employing point-to-point measurement; The certain lateral separation in horizontal every interval is as slotted line on workpiece; Vertically a point to be measured is set and measures once, write down the self-emission letter magnetic signal value of each measurement point along every certain fore-and-aft distance in the every interval of slotted line.During measurement, the probe of said magnetic memory detector is fixed on the non-magnetic object and apart from measured workpiece height 0.5-1.5mm point-to-point measurement.
Further preferably, said lateral separation is 10～15mm, and said fore-and-aft distance is 3～5mm.
Positive progressive effect of the present invention is: the present invention can measure the stress concentrated position and the size of workpiece after the thermal treatment fast, and easy to operate simple, and the result is easy to pass judgment on, and available computer software is handled, and is easy to pipelining and file.And the present invention can reduce or eliminate safe hidden trouble, and gives full play to the potential of material, reduces production costs, and improves Enterprises'Competitiveness.
Description of drawings
Fig. 1 is the synoptic diagram of measuring position of the present invention.
Embodiment
Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to specify technical scheme of the present invention.
The method for quick that heat treated part stress of the present invention is concentrated may further comprise the steps:
One, ferromagnetic workpiece is heat-treated.Thermal treatment in the present embodiment comprises quenches and annealing in process.Heat treatment test adopts SX2-2.5-10 molding box formula resistance furnace and supporting TSX2-4-10 molding box formula resistance furnace controller.Chamber type electric resistance furnace mainly is used for heating measured workpiece, and the chamber type electric resistance furnace controller mainly is used for controlling heating-up temperature.Chamber type electric resistance furnace size of burner hearth 200 * 120 * 80mm, voltage 220V, power 2.5kW, 1000 ℃ of maximum operation (service) temperatures.Resistance furnace controller power source voltage 220V, power controlling 400W.During quenching heat treatment, workpiece is put into chamber type electric resistance furnace with the stove heating, be heated to 840～950 ℃ of temperature, be incubated water-cooled after 20～40 minutes.Annealing is put into chamber type electric resistance furnace with the stove heating with workpiece during thermal treatment, is heated to 840～950 ℃ of temperature, and it is cold to be incubated after 20～40 minutes stove.Remove the oxide skin of surface of the work with sand paper.It will be understood by those skilled in the art that quenching and annealing that thermal treatment that the present invention is suitable for is not limited to mention here, also comprise the Technology for Heating Processing of other type.
Two, to the heat treated part processing of demagnetizing.Adopt the CT-250 degaussion coil during demagnetization, internal coil diameter is 250 * 250 ㎜, physical dimension: 400 (length) * 200 (wide) * 400 (height) mm, and coil current is 10～15A, central magnetic field intensity is 20000A/m.During demagnetization, give coil electricity, let the workpiece after the thermal treatment at the uniform velocity pass through coil with the speed of 8-9m/min..Carry out measurement of residual magnetism with magnetic strength appearance JCZ-10 then, get final product less than 2GS.
Three,, carry out the self-emission magnetic signal respectively and measure to the workpiece after quenching and annealing in process.The measuring principle of self-emission magnetic signal is based on magneto-mechanical effect, and after ferromagnetic material received stress, its surface magnetism can change, and is equivalent to stress and on ferromagnetic sample, produces an Equivalent Magnetic Field, and the magnetic property of sample is changed.When not had stress to concentrate by the workpiece after the thermal treatment; The self-emission magnetic signal is more stable; If when being existed stress to concentrate somewhere by the workpiece after the thermal treatment, then the self-emission magnetic signal at this place will be undergone mutation, and the Changing Pattern of therefore measuring the self-emission magnetic signal of sample through magnetic memory detector just can be judged by the stress concentrated position and the degree of sample after the thermal treatment; The self-emission magnetic signal is big more, and then stress concentration degree is big more.Carry out the measuring equipment employing TSC-1M-4 type magnetic memory detector that the self-emission magnetic signal is measured, its key technical indexes is: Hp value measurement range ± 2000A/m; Measure port number 2-4 passage (according to probe); Minimum step-length (spacing) 1mm that measures; Maximum step-length (spacing) 128mm that measures; Maximum sweep rate (when step-length is 1mm) 0.2-0.5 meter per second; The basic relative error of every passage magnetic-field measurement＜5%; Linear measure longimetry relative error < 5%; Operating temperature range-15 ℃～+ 55 ℃; Physical dimension 230 * 105 * 40mm.
Concrete measuring process comprises:
1) measure before, workpiece is placed on (like plank, smooth cement flooring or austenitic stainless steel etc.) on the non-magnetic object, simultaneously with the magnetic memory detector zeroing, with the influence of the magnetic of eliminating the workpiece surrounding enviroment to measurement result.
2) adopt the method for point-to-point measurement to measure.The method of point-to-point measurement adopts horizontal every interval 10～15mm (as shown in Figure 1 as slotted line; Slotted line in the work comprises first slotted line 11, second slotted line 12, the 3rd slotted line 13) the position; Vertically along every every interval 3～5mm of slotted line a point to be measured being set measures once; Before measuring the point that will measure is carried out mark, probe is fixed on the non-magnetic object, and the workpiece height after tested thermal treatment is 0.5～1.5mm; Begin pointwise after being ready to and measure, and note every self-emission magnetic signal value.The measuring position is as shown in Figure 1.
Four, measurement result is handled.Calculate the mean value of whole measured values earlier, if the numerical value of some measurement point self-emission magnetic signal apparently higher than mean value, calculates the position that stress is concentrated according to the position of these points and every spacing distance.Concrete computing method are earlier the self-emission magnetic signal value that records to be asked on average, and then each the magnetic signal value and the mean value that will record compares, as if the magnetic signal value obviously greater than mean value; This point multiply by every spacing apart from the number of first point so; Just obtain the position that this stress is concentrated, if the measured value in somewhere, explains then that this place exists stress to concentrate apparently higher than mean value; And the self-emission magnetic signal must be many more than the mean value height, and then stress concentration degree is big more.
Five, position and the size concentrated according to the test result counter stress are made sign on workpiece, and carry out record.
It is that 50～70mm, length are that the heat treated part of 90～110mm is measured as sample that the present invention can adopt a width; Measure along slotted line; Direction of measurement every interval 3～5mm on down measures once; Note the numerical value of each measurement, specifically see the self-emission magnetic signal value table of each point under the annealed condition of self-emission magnetic signal value table and table 2 of each point under the as-quenched of table 1.
The self-emission magnetic signal value table (A/m) of each point under table 1 as-quenched
| First slotted line 11 | Second slotted line 12 | The 3rd slotted line 13 |
| 196 | 195 | 196 |
| 194 | 193 | 195 |
| 197 | 196 | 197 |
| 195 | 195 | 194 |
| 196 | 196 | 194 |
| 195 | 195 | 196 |
| 196 | 197 | 195 |
| 194 | 196 | 195 |
| 197 | 195 | 195 |
| 196 | 194 | 196 |
| 195 | 197 | 195 |
| 195 | 196 | 194 |
| 194 | 196 | 197 |
| 196 | 194 | 198 |
| 193 | 195 | 194 |
| 196 | 197 | 193 |
| 195 | 196 | 196 |
| 194 | 195 | 196 |
| 197 | 194 | 195 |
| 195 | 196 | 196 |
| 196 | 195 | 197 |
| 249 | 195 | 195 |
| 297 | 196 | 194 |
| 295 | 195 | 196 |
| 294 | 196 | 195 |
| 256 | 195 | 195 |
| 195 | 197 | 197 |
| 197 | 195 | 196 |
| 195 | 195 | 196 |
| 196 | 196 | 195 |
The self-emission magnetic signal value table (A/m) of each point under table 2 annealed condition
| First slotted line 11 | Second slotted line 12 | The 3rd slotted line 13 |
| 21 | 22 | 24 |
| 20 | 21 | 21 |
| 22 | 22 | 22 |
| 21 | 23 | 21 |
| 20 | 24 | 62 |
| 21 | 21 | 95 |
| 22 | 22 | 123 |
| 21 | 23 | 122 |
| 22 | 21 | 92 |
| 21 | 22 | 61 |
| 20 | 21 | 23 |
| 23 | 22 | 21 |
| 21 | 22 | 23 |
| 22 | 21 | 22 |
| 21 | 23 | 22 |
| 23 | 22 | 23 |
| 22 | 21 | 21 |
| 22 | 23 | 21 |
| 21 | 22 | 23 |
| 23 | 22 | 21 |
| 22 | 22 | 23 |
| 21 | 21 | 22 |
| 23 | 22 | 21 |
| 21 | 23 | 24 |
| 22 | 23 | 23 |
| 23 | 24 | 21 |
| 23 | 21 | 22 |
| 21 | 22 | 21 |
| 24 | 23 | 22 |
| 22 | 21 | 22 |
Can find out from table 1 and table 2; The sample of quenching attitude has the sudden change zone of two places self-emission magnetic signal value respectively near the position of lower end near the position of upper end and annealed state sample at first slotted line 11; Detect principle according to metal magnetic memory and can know that this zone is region of stress concentration.The workpiece that the present invention can be used for after various Technologies for Heating Processing are handled carries out the detection of region of stress concentration, and the workpiece shape is unrestricted, and finished product or semi-manufacture are all applicable to this method.The present invention can measure the stress concentrated position and the size of workpiece after the thermal treatment fast, and easy to operate simple, and the result is easy to pass judgment on, and available computer software is handled, and is easy to pipelining and file.And the present invention can reduce or eliminate safe hidden trouble, and gives full play to the potential of material, reduces production costs, and improves Enterprises'Competitiveness.
Those skilled in the art can carry out various remodeling and change to the present invention.Therefore, the present invention has covered various remodeling and the change in the scope that falls into appending claims and equivalent thereof.
Claims (5)
1. the method for quick concentrated of a heat treated part stress is characterized in that it may further comprise the steps:
One, workpiece for measurement is heat-treated;
Two, to the heat treated part processing of demagnetizing;
Three,, carry out the self-emission magnetic signal and measure to the heat treated part after handling;
Four, calculate measurement result,, then confirm the position that stress is concentrated according to the position of these test points if the numerical value of self-emission magnetic signal is apparently higher than mean value on the position of said some test point of workpiece;
Five, identify position and the size that stress is concentrated according to the test result judgement and at workpiece.
2. the method for quick that heat treated part stress as claimed in claim 1 is concentrated is characterized in that, adopts TSC-1M-4 type magnetic memory detector to carry out said self-emission magnetic signal and measures.
3. the method for quick that heat treated part stress as claimed in claim 2 is concentrated is characterized in that, said self-emission magnetic signal is measured and specifically comprised: 1) workpiece is placed on the non-magnetic object and with said magnetic memory detector and return to zero; 2) method of employing point-to-point measurement, the certain lateral separation in horizontal every interval vertically is provided with a point to be measured along every certain fore-and-aft distance in the every interval of slotted line and measures once as slotted line on workpiece, writes down the self-emission magnetic signal value of each measurement point.
4. the method for quick that heat treated part stress as claimed in claim 3 is concentrated is characterized in that, the probe of said magnetic memory detector is fixed on the non-magnetic object and apart from measured workpiece height 0.5-1.5mm point-to-point measurement.
5. the method for quick that heat treated part stress as claimed in claim 4 is concentrated is characterized in that said lateral separation is 10～15mm, and said fore-and-aft distance is 3～5mm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102935398A (en) * | 2012-10-19 | 2013-02-20 | 中信重工机械股份有限公司 | Zero adjustment method used during large-scale mill cylinder stress force measurement |
| CN113375846A (en) * | 2021-05-17 | 2021-09-10 | 西南石油大学 | Device and method for quickly detecting axial stress of pipeline |
| CN114942090A (en) * | 2022-04-11 | 2022-08-26 | 江苏科技大学 | Correction method for evaluating stress of ferromagnetic cladding layer based on self-emission magnetic signal |
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| CN101210904A (en) * | 2006-12-28 | 2008-07-02 | 上海宝钢工业检测公司 | Metal magnetic memory rapid previewing method |
| CN102445491A (en) * | 2011-10-11 | 2012-05-09 | 中国人民解放军装甲兵工程学院 | Method for evaluating stress concentration degree of remanufactured blank by using self-emission magnetic signal |
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- 2012-05-30 CN CN2012101714245A patent/CN102706953A/en active Pending
Patent Citations (2)
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| CN101210904A (en) * | 2006-12-28 | 2008-07-02 | 上海宝钢工业检测公司 | Metal magnetic memory rapid previewing method |
| CN102445491A (en) * | 2011-10-11 | 2012-05-09 | 中国人民解放军装甲兵工程学院 | Method for evaluating stress concentration degree of remanufactured blank by using self-emission magnetic signal |
Non-Patent Citations (1)
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| 罗更生，等: "金属磁记忆检测技术在热处理工艺评定中的应用", 《无损检测》, vol. 30, no. 6, 31 December 2008 (2008-12-31), pages 353 - 354 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102935398A (en) * | 2012-10-19 | 2013-02-20 | 中信重工机械股份有限公司 | Zero adjustment method used during large-scale mill cylinder stress force measurement |
| CN102935398B (en) * | 2012-10-19 | 2014-08-06 | 中信重工机械股份有限公司 | Zero adjustment method used during large-scale mill cylinder stress force measurement |
| CN113375846A (en) * | 2021-05-17 | 2021-09-10 | 西南石油大学 | Device and method for quickly detecting axial stress of pipeline |
| CN113375846B (en) * | 2021-05-17 | 2021-12-03 | 西南石油大学 | Device and method for quickly detecting axial stress of pipeline |
| CN114942090A (en) * | 2022-04-11 | 2022-08-26 | 江苏科技大学 | Correction method for evaluating stress of ferromagnetic cladding layer based on self-emission magnetic signal |
| CN114942090B (en) * | 2022-04-11 | 2024-05-03 | 江苏科技大学 | Correction method for evaluating ferromagnetic cladding layer stress based on self-emission magnetic signal |
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Application publication date: 20121003 |