CN105092700B - A kind of flow harden contact fatigue micro-flaw detection method of roll - Google Patents
A kind of flow harden contact fatigue micro-flaw detection method of roll Download PDFInfo
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- CN105092700B CN105092700B CN201510346008.8A CN201510346008A CN105092700B CN 105092700 B CN105092700 B CN 105092700B CN 201510346008 A CN201510346008 A CN 201510346008A CN 105092700 B CN105092700 B CN 105092700B
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Abstract
A kind of flow harden contact fatigue micro-flaw detection method of roll, belongs to roll lossless detection method technical field, for being detected to the roll flow harden contact fatigue micro-flaw in milling train.Its technical solution is：The tested support roller after lower machine is detected using supersonic detector and probe, tested support roller is demarcated first, DGS curves are made；Then the body of roll for being tested support roller carries out circumferential and axial scanning；, fatigue crack qualitative to body of roll progress fatigue crack is quantitatively positioned with fatigue crack.The detection method of the present invention has the remarkable advantages such as safe and reliable, flexible and convenient, easy to operate, a kind of novel, practical detection technique is provided for the detection of rolling mill for hot rolled planks and strips roll fatigue crack, the blank of the flow harden contact fatigue micro-flaw detection of roll for hot-rolling is filled up, it is possible to prevente effectively from the intensification and development of fatigue crack, it significantly reduces production cost and improves economic benefit, in industry there is great popularizing value.
Description
Technical field
The present invention relates to a kind of detection sides of the roll flow harden contact fatigue micro-flaw in rolling mill for hot rolled planks and strips
Method belongs to roll lossless detection method technical field.
Background technology
With the fast development of production, the roll of hot rolling mill is increased using load, and support roller and rough rolling working roll make
Substantially extended with the period, the normal consumption for resulting in roll increases.Due to longer service life and high intensity produce load,
So that roll occurs " flow harden contact fatigue micro-flaw " in use（Hereinafter referred to as fatigue crack）.At present, by
In lacking the ultrasonic detection technology to this fatigue crack so that the roll with crackle cannot obtain timely and effective be located in
Reason, causes hot rolling mill roll consumption higher or even roll edge peels off the unfavorable situation scrapped in advance, not only increases production
Cost has also seriously affected being smoothed out for production.
By a large amount of research and analysis, " flow harden contact fatigue micro-flaw " formation mechenism is since roll is in machine
Under the effects that long-term, huge roll-force and bending roller force, body surface contact area generates plastic deformation, since extrusion effect makes
Obtain the raising of roll surface hardness, degraded toughness.Simultaneously as much time using so that roll surface crosses the abrasion of steel region transitions, is formed
" bone-shaped " roller shape of steel both sides raised central portion recess, so as to cross the roll line load peaks at steel position in the roll surface that originally there is
The roll-force in region more increases, and generates localized contact fatigue.When rotated, roll surface is in frequent alternation tension and compression active force for roll
Under, roll surface is crossed steel position and is subcutaneously generated due to over fatigue under alternating shear stress along the fatigue in body of roll edge circumferential direction
Crackle band, once this crack propagation, will cause support roller peeling and scrap.
Formation, the development of this fatigue crack are divided into Four processes：
First, the district's groups of peak stress knit lattice cracking, distortion, dislocation, stacking etc. occur slightly under contact fatigue region
Metaboly.Such situation naked eyes are invisible, can only can see under the microscope；
Second, occur cracking, distortion, dislocation, stacking lattice further expand, connecting forms the micro- of certain length and splits
Line.Such situation naked eyes are not generally visible, and ultrasonic wave can detect that magnetic powder is slightly seen, and dye penetrant inspection can't detect；
Third, micro-flaw are subcutaneously being further expanded, are being coupled, and certain area pattern cracking layer are formed, in alternating load
Under the action of generate the strip of macroscopic view or latticed crackle, until small peeling（It loses flesh）Phenomenon occurs.Such phenomenon macroscopic view as it can be seen that
By, qualitatively comprehensive analysis quantitative to invalid position, there is the possibility of redemption；
4th, crackle or micro-flaw subcutaneous residual stress, smelt be mingled with etc. under the influence of quickly sent out to body of roll inside
Exhibition, until shoulder is peeled off or fallen to binder course or weak section occurrence of large-area.Once occurring, roll can not be retrieved directly such situation
It scraps.
By the analysis to " flow harden contact fatigue micro-flaw " formation mechenism and feature, it is known that fatigue is split
The mechanism of production of line is substantially that contact generates between elastic flattening and roller between by roller.The hertz formula of contact mechanics shows,
Peak stress about 10mm right positions below roller surface under contact fatigue region, crackle, which is formed, initial small to be difficult to find to distinguish
Not, development speed is again extremely rapid, once production accident and great economic loss will be led to by missing optimization process chance.Cause
This, fatigue crack detection technique should implement it monitoring and control in the second stage of crack growth, and it is pre- can to reach safety
It is anti-to consume dual-purpose optimum efficiency with reducing roller.
Invention content
The technical problems to be solved by the invention are to provide a kind of flow harden contact fatigue micro-flaw detection of roll
Method, the detection method of this roll fatigue crack can carry out qualitative and quantitative inspection by ultrasonic wave to the fatigue crack of roll
Survey, detect fatigue crack in time, with can in time to problematic roll implement grinding repair, the intensification of Crack prevention defect and
Development has the function that reduce roller consumption.
Solving the technical solution of above-mentioned technical problem is：
The flow harden contact fatigue micro-flaw detection method of a kind of roll, using supersonic detector and probe under
Tested support roller after machine is detected, and the roll surface surface smoothness ▽ 6 of tested support roller is preferred, detection using following steps into
Row：
A. the calibration of instrument and probe：In the timing of tested support roller subscript, make probe distance roll end face 200mm, adjust
Bottom wave B is adjusted to 80%f.s by gain, writes down yield value at this time, keeps that gain is constant to be again moved to probe apart from end face
400mm positions are write down bottom wave B wave height at this time, are according to said method analogized, until write down apart from end face 800mm positions bottom wave B wave height,
Above record point is connected into smoothed curve, DGS curves are both made；
B. scanning mode：In the two lateral extent end face 800mm positions of the body of roll of tested support roller, circumferential scanning is done to end face,
Axial scanning is done in two lateral extent end face 0~800mm positions of the body of roll of tested support roller；
C. fatigue crack is qualitative：When axial direction is done in contact fatigue region with the detection of peripheral surface wave, same position has grass
Shape echo, you can be judged as that fatigue crack reflects signal；
D. fatigue crack quantifies：The defects of two kinds of scanning directions, wave F should not be simultaneously above DGS curve corresponding position B wave waves
High 25% reaches this standard and judges roll qualification, can use safely.
The flow harden contact fatigue micro-flaw detection method of above-mentioned roll, in the fatigue crack qualitative step,
It first has to exclude roll material or instrumental sensitivity adjusts improper caused crystal boundary and crystal grain grass-like reflection echo.
The flow harden contact fatigue micro-flaw detection method of above-mentioned roll, it is also necessary to fatigue crack be carried out to roll and determined
Position, fatigue crack positioning：First, range estimation body of roll both sides roll surface wearing and roughness scenario, crackle are easy after machine under roll normal use
Appear in the more serious region of contact wear；Second is that according to roller curve before roll dressing, contact fatigue region mainly occurs
The precipitous both sides of " bone-shaped " roll shape after roll wear.
The beneficial effects of the invention are as follows：
The present invention is analyzed by live a large amount of fatigue crack using the collection of data, sums up the development of fatigue crack
Journey and feature develop artificial ultrasound surface wave fatigue detecting technology for its feature, and this detection method is suitble to casting forged steel
All support rollers of material, the fatigue crack of rough rolling working roll carry out qualitative, quantitative and positioning judgement, tired by detecting in time
Labor crackle avoids a series of upper machine rolling peeling accident, and can carry out grinding reparation to problematic roll in time, avoids
The intensification and development of crack defect play positive effect to reducing roller consumption and improving roll effectively to use.
The detection method of the present invention has the remarkable advantages such as safe and reliable, flexible and convenient, easy to operate, since implementation,
It is total to the branch time of detecting and tracking roll more than 600 in this year, upper machine accident occurs in no an example roll, is rolling mill for hot rolled planks and strips roll fatigue
Crack detection provides a kind of novel, practical detection technique, and the flow harden contact fatigue for having filled up roll for hot-rolling micro- is split
The blank of line detection, significantly reduces production cost and improves economic benefit, in industry there is great popularizing value.
Description of the drawings
Fig. 1 is the roll DGS curves of the present invention.
It is marked in figure as follows：The distance x of gain z, probe distance end surface of roll.
Specific embodiment
Pass through the analysis to " flow harden contact fatigue micro-flaw " formation mechenism and feature, the generation machine of fatigue crack
Reason essence be that contact generates between elastic flattening and roller between by roller, under contact fatigue region peak stress roller surface with
Lower about 10mm right positions, crackle formed it is initial it is small be difficult to find to distinguish, development speed is again extremely rapid, once miss most
Good processor can will lead to production accident and great economic loss.Therefore, fatigue crack detection technique should be formed in crackle
Starting stage implements it monitoring and control, can reach safety precautions with reducing roller and consume dual-purpose optimum efficiency.
For this purpose, we develop the ultrasonic detection technology of a set of fatigue crack, problems are fundamentally solved.Hot rolling
After factory has grasped this key technology, support roller is consumed with rough rolling working roll and is greatly reduced, and an example does not occur again
Spalling of rolls scraps accident.
The flow harden contact fatigue micro-flaw detection method of the roll of the present invention, is carried out using following steps：
The preparation of instrument and equipment：Supersonic detector and probe should select quality preferably, the equipment of high sensitivity.This
It is 2MHz surface wave probes that one embodiment of invention, which selects frequency probe,.
The scaling method of instrument and probe：In the timing of tested support roller subscript（Roll surface surface smoothness ▽ 6 is preferred）, make spy
Head adjusts gain and bottom wave B is adjusted to 80%f.s, write down yield value at this time, keep gain constant again apart from roll end face 200mm
Probe is moved to apart from end face 400mm positions, bottom wave B wave height at this time is write down, according to said method analogizes, until writing down apart from end face
Above record point is connected into smoothed curve, DGS curves is both made by 800mm positions bottom wave B wave height.DGS curves in Fig. 1 increase
The distance x of beneficial z, probe distance end surface of roll.
Scanning mode：In two lateral extent end face 800mm positions of the body of roll, circumferential scanning is done to end face, in two lateral extent of the body of roll
Do axial scanning in end face 0~800mm positions.
Fatigue crack is qualitative：Roll material should be excluded first or instrumental sensitivity adjusts improper caused crystal boundary and crystal grain grass
Shape reflection echo.When axial direction is done in contact fatigue region with the detection of peripheral surface wave, same position has grass-like echo, you can sentences
Break and reflect signal for fatigue crack.
Fatigue crack positions：Body of roll both sides roll surface wearing and roughness scenario can be estimated under roll normal use after machine,
Crackle easily appears in the more serious region of contact wear；Roller curve before roll dressing, contact fatigue region master can be referred to
Appear in the precipitous both sides of " bone-shaped " roll shape.
Fatigue crack quantifies（Criterion）：The defects of two kinds of scanning directions, wave F should not correspond to position simultaneously above DGS curves
The 25% of B wave wave height is put, i.e. judgement is qualified, can use safely.
The implementation result of the present invention：
The present invention is since certain enterprise's hot rolling mill is implemented, and the branch time of detecting and tracking roll more than 600, no an example pass through altogether in this year
There is upper machine accident in the roll for crossing detection.By detecting fatigue crack in time, a series of upper machine rolling peeling accident is avoided,
And the roll for having fatigue crack problem is ground in time, the intensification and development of Crack prevention defect, to reducing roller consumption and carrying
High roll effectively uses and plays positive effect.
Claims (2)
1. a kind of flow harden contact fatigue micro-flaw detection method of roll, it is characterised in that：Use supersonic detector
The tested support roller after lower machine is detected with probe, the roll surface surface smoothness ▽ 6 of tested support roller is preferred, and detection uses
Following steps carry out：
A. the calibration of instrument and probe：In the timing of tested support roller subscript, make probe distance roll end face 200mm, adjust gain
Bottom wave B is adjusted to 80%f.s, writes down yield value at this time, keeps that gain is constant to be again moved to probe apart from end face 400mm
It puts, writes down bottom wave B wave height at this time, according to said method analogize, until writing down apart from end face 800mm positions bottom wave B wave height, will remember above
Record point connects into smoothed curve, and DGS curves are both made；
B. scanning mode：In the two lateral extent end face 800mm positions of the body of roll of tested support roller, circumferential scanning is done to end face, in quilt
Do axial scanning in the two lateral extent end face 0~800mm positions of the body of roll for surveying support roller；
C. fatigue crack is qualitative：It first has to exclude roll material or instrumental sensitivity adjusts improper caused crystal boundary and crystal grain grass
Shape reflection echo, when axial direction is done in contact fatigue region with the detection of peripheral surface wave, same position has grass-like echo, you can sentences
Break and reflect signal for fatigue crack；
D. fatigue crack quantifies：The defects of two kinds of scanning directions, wave F should not be simultaneously above DGS curve corresponding position B wave wave height
25%, reach this standard and judge roll qualification, can use safely.
2. the flow harden contact fatigue micro-flaw detection method of roll according to claim 1, it is characterised in that：Also
It needs to carry out roll fatigue crack positioning, fatigue crack positioning：First, two side roller of the body of roll is estimated under roll normal use after machine
Surface wear and roughness scenario, crackle easily appear in the more serious region of contact wear；Second is that according to roll shape before roll dressing
Curve, contact fatigue region mainly appear on the precipitous both sides of the roll shape after roll wear.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510346008.8A CN105092700B (en) | 2015-06-23 | 2015-06-23 | A kind of flow harden contact fatigue micro-flaw detection method of roll |
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| CN201510346008.8A CN105092700B (en) | 2015-06-23 | 2015-06-23 | A kind of flow harden contact fatigue micro-flaw detection method of roll |
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| CN105092700B true CN105092700B (en) | 2018-06-19 |
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Families Citing this family (3)
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| CN112861394B (en) * | 2021-01-19 | 2022-07-08 | 北京科技大学 | Cold-rolling roller grinding amount optimization method and system based on genetic particle swarm optimization |
| CN113553738B (en) * | 2021-07-01 | 2022-11-15 | 邯郸钢铁集团有限责任公司 | Fatigue life prediction method for hot-rolled plate strip rolling mill |
| CN116297848B (en) * | 2023-03-31 | 2023-12-01 | 粤海中粤(中山)马口铁工业有限公司 | Efficient roller crack detection device and application method thereof |
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