CN107245551A - Lift the laser-quenching technique of autobody sheet intensity - Google Patents
Lift the laser-quenching technique of autobody sheet intensity Download PDFInfo
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- CN107245551A CN107245551A CN201710380556.1A CN201710380556A CN107245551A CN 107245551 A CN107245551 A CN 107245551A CN 201710380556 A CN201710380556 A CN 201710380556A CN 107245551 A CN107245551 A CN 107245551A
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- steel plate
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- scanning galvanometer
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
A kind of laser-quenching technique for lifting autobody sheet intensity, steel plate is placed horizontally on tank support, lower surface of steel plate is contacted with the water surface, and the thickness maintained above water is the 50% to 70% of steel plate gross thickness；It is (steel plate thickness/1.6mm) * 1200W, scanning galvanometer sweep speed to set carbon dioxide laser working apparatus working power：200mm/min, laser scanning width：0 arrives 15mm；Scanning galvanometer walking path uses walking in a horizontal state, cooling velocity >=30 DEG C/s of cooling water, laser scanning number of times：1 time, scanning galvanometer is with processing workpiece spacing：130mm, laser irradiation direction：Perpendicular to steel plate.This method can efficiently be quenched to different-thickness steel plate, obtained complete martensitic structure or the martensitic structure of certain depth after realizing Steel plate laser quenching, taken into account laser energy consumption and quenching effect.
Description
Technical field
The present invention relates to quenching technical, more particularly to a kind of laser-quenching technique for lifting autobody sheet intensity.
Background technology
Laser quenching is the important component in field of laser processing, and it is to scan work rapidly with high energy laser beam
Part, it is quick in one layer of very thin zonule of its surface to absorb energy and temperature is increased, phase transition temperature is reached, workpiece base is utilized
The heat transfer of body realizes self-quench hardening, makes workpiece surface transformation hardening.The more conventional quenching of laser quenching has that process velocity is fast, work
The skill cycle is short, production efficiency is high, without hardening media the features such as.
Laser quenching technology is compared with traditional surface hardening technology, and obtained hardening layer tissue is thinner, and hardness is higher than normal
Advise the hardness of quenching.The martensite that laser quenching is obtained is made up of acicular martensite and lath martensite mixing, dislocation
The traditional surface hardening of density ratio is high, and dislocation strengthening effect can also strengthen.
Chinese patent notification number：It refer in a kind of plate type part laser-quenching apparatus disclosed in the U of CN 205528896 pair
The device processed in plate class, learns, its improvements is from the introduction of the device：Using cooling air pipe, in plate class work
Quenching plate type part is treated above part mounting platform to be blown.It was verified that cooling effect is poor, and it is air-cooled for laser
Power improves restricted, so as to have impact on the quenching effect to different steel plates and different-thickness.
The content of the invention
The technical problem to be solved in the present invention is：Design one kind can efficiently be quenched to different-thickness steel plate, be realized
A kind of laser-quenching technique of local lifting autobody sheet intensity of martensitic structure completely is obtained after Steel plate laser quenching.
The technique of the present invention comprises the following steps：
（1) steel plate is positioned on tank support, lower surface of steel plate is contacted with the cooling water surface, and steel plate is maintained horizontal plane
Thickness above is the 50% to 70% of steel plate gross thickness, cooling velocity >=30 DEG C/s of cooling water；
（2) carbon oxide laser working apparatus working power：It is set to (steel plate thickness/1.6mm) * 1200W；
（3) scanning galvanometer and surface of steel plate distance：130mm, laser irradiation direction：Perpendicular to steel plate；
（4) scanning galvanometer uses horizontal sweep one stroke, sweep speed：200mm/min, laser scanning width：0 arrives 15mm；
The edge of described steel plate is clamped device or magnetic iron absorption device is fixed.
There is fountain head in described tank, the cooling current gushed out are right against the steel plate where scanning galvanometer walking path
Lower surface.
Beneficial effect of the present invention：
Technique by the way of the high-efficiency water cooling that lower surface of steel plate is contacted with the water surface, makes full use of steel plate heat transfer special on the whole
Property, improve quenching effect, it is only necessary to scan 1 time, so as to improve laser processor processing efficiency, realize and steel plate is locally swashed
Photoquenching obtains the validity of martensitic structure, takes into account laser energy consumption and quenching effect.
Brief description of the drawings
Accompanying drawing 1：The full hardening deepness of the present invention is 0.4mm hardness test result curve.
Accompanying drawing 2：The hardness test result curve of through hardening completely of the invention.
Accompanying drawing 3：Simple tension load-deformation curve comparison diagram before and after laser quenching（Unit GPa, elongation percentage x100%）.
Embodiment
To quench object：The cold rolling boron plate mother metal of one of autobody sheet（22MnB5）, thickness selects between 0.8-2.5mm
1.6mm steel plate is taken, tensile strength is 490MPa or so, and hardness is 180-200Hv（Vickers hardness）.
1. steel plate is placed horizontally on tank support, cooling water is injected in bosh, makes lower surface of steel plate and water
Face is contacted, and the thickness for making to maintain above water is the 50% to 70% of steel plate gross thickness；
2. carbon dioxide laser working apparatus working power is set：(steel plate thickness/1.6mm) * 1200W are set to, scanning galvanometer is swept
Retouch speed：200mm/min, laser scanning width：0 arrives 15mm；
3. scanning galvanometer walking path uses walking in a horizontal state, cooling velocity >=30 DEG C/s of cooling water, laser scanning number of times：1 time,
Galvanometer and workpiece surface distance：130mm, laser irradiation direction：Perpendicular to steel plate.
Upper surface of steel plate carries out laser quenching, and the lower surface moment keeps being in contact with cooling water portion, it is ensured that quenching heat is fast
Speed conduction diffusion, control laser processor carries out selective laser quenching to upper surface of steel plate to realize mother metal according to specified path
Strength enhancing purpose, complete martensitic structure can be locally obtained after quenching in steel plate, and obtaining standard tensile test specimen to wire cutting enters
Row one directional tensile test, makes metallographic test block and carries out knowable to vickers hardness test, such as Fig. 1 full hardening deepness is only 0.4mm hardness
In test result, 530Hv or so can reach by the part hardness of laser through hardening, it is original that the part without through hardening remains steel plate
Hardness.
Shown in Fig. 2：Steel plate tensile strength after complete through hardening can improve to 3 times of original mother metal ferritic structure even with
On（1500-1650MPa or so）, hardness can reach 500-530Hv（Vickers hardness）.In addition, Fig. 3 tension test curve comparison
Further demonstrate that, using this experimental method, before steel plate simple tension load-deformation curve is obvious than laser quenching after laser quenching
Mother metal it is more preferable.
It is demonstrated experimentally that in laser quenching, if the sufficient situation of heating amount, and steel plate cooling velocity reaches 30 or even 40
DEG C/more than s can just obtain complete martensitic structure, and cooling rate is relatively low, only 10 DEG C/s, it is impossible to martensitic structure is obtained,
Bainite structure can only be obtained.
In order to improve laser power under water-cooled effect, but ensure again steel plate will not local heating cause thermal deformation, institute
Device is clamped with the edge for preferably making steel plate to fix.Clamping device can be that common long-bar metal block passes through screw spiral shell
Mother twists solid rear biting connecions structure up and down.
Cooling velocity：Experiment shows cooling velocity >=30 DEG C/s of cooling water under normal temperature, and cooling velocity is only more than the value,
Boron plate, which is undergone phase transition, after laser heating could obtain martensitic structure, and The faster the better for cooling velocity.Therefore provided with spray in tank
Head, the cooling current gushed out are right against the lower surface of steel plate where scanning galvanometer walking path.When experiment measures 23 DEG C of room temperature,
Make steel plate under the condition of high temperature from the average cooling rate of water when being reduced to 150 DEG C for 900 DEG C be 75 DEG C/s, the cooling at a certain moment
Velocity peak values are even up to 180 DEG C/s.Table 1 below is further by unilateral water cooling in the inventive method and sweep speed 200mm/
Laser quenching effect under min is engaged is compared with the prior art, and illustrates its progressive.
When application the inventive method carries out laser quenching for the larger steel plate of some thickness, steel plate is allowed to maintain in method
50% to 70% become particularly important in thickness above water for steel plate gross thickness, when using formula (steel plate thickness/
When 1.6mm) * 1200W calculating obtains carbon dioxide laser working apparatus working power for more than 3000W, the steel plate quilt of correspondence thickness
After laser quenching obtained by martensitic structure depth reach critical value, if immersion cooling water in thickness be not reaching to 30% to
50%, then the negative condition of complete martensitic structure can not be obtained by occurring that steel plate upper and lower surface temper grade is inconsistent, if steel plate
Meet immersion depth, then experiment show actual martensitic structure can than script depth critical value more than 5% to 15%.
It should be understood by those skilled in the art that, the present invention is not limited to the above embodiments, above-described embodiment and explanation
The basic technology for simply illustrating the present invention described in book, it is of the invention without departing from the spirit and scope of the present invention also
There are various changes and modifications, these changes and improvements all fall within the protetion scope of the claimed invention.Claimed model
Enclose and defined by appended claims and its equivalent.
Claims (3)
1. a kind of laser-quenching technique for lifting autobody sheet intensity, comprises the following steps：
1. steel plate is positioned on tank support, lower surface of steel plate is contacted with the cooling water surface, and steel plate is maintained horizontal plane
Thickness above is the 50% to 70% of steel plate gross thickness, cooling velocity >=30 DEG C/s of cooling water；
2. carbon dioxide laser working apparatus working power is set：It is set to (steel plate thickness/1.6mm) * 1200W；
3. scanning galvanometer and surface of steel plate distance：130mm, laser irradiation direction：Perpendicular to steel plate；
4. scanning galvanometer uses horizontal sweep one stroke, sweep speed：200mm/min, laser scanning width：0 arrives 15mm.
2. the laser-quenching technique of lifting autobody sheet intensity according to claim 1, it is characterised in that：Described steel
The edge of plate is clamped device or magnetic iron absorption device is fixed.
3. the laser-quenching technique of lifting autobody sheet intensity according to claim 1, it is characterised in that：Described water
There is fountain head in groove, the cooling current gushed out are right against the lower surface of steel plate where scanning galvanometer walking path.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710380556.1A CN107245551A (en) | 2017-05-25 | 2017-05-25 | Lift the laser-quenching technique of autobody sheet intensity |
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| CN201710380556.1A CN107245551A (en) | 2017-05-25 | 2017-05-25 | Lift the laser-quenching technique of autobody sheet intensity |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108676969A (en) * | 2018-05-24 | 2018-10-19 | 上海业识科技有限公司 | The processing method for promoting boron steel body of a motor car and strength of parts by laser quenching |
| CN110295270A (en) * | 2019-06-04 | 2019-10-01 | 沈阳中科煜宸科技有限公司 | A kind of pair of thin sheet surface laser-quenching method |
| CN112662864A (en) * | 2020-12-11 | 2021-04-16 | 浙江工业大学 | Underwater quenching method for thin steel plate |
| CN114045377A (en) * | 2022-01-07 | 2022-02-15 | 北京煜鼎增材制造研究院有限公司 | Laser phase change strengthening method for surface of medium carbon steel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732695A (en) * | 2012-06-23 | 2012-10-17 | 吉林大学 | Metal surface laser processing method in liquid medium |
| CN103343189A (en) * | 2013-07-19 | 2013-10-09 | 江苏大学 | Method for combinatorially reinforcing thick plate through laser shock |
| CN104308361A (en) * | 2014-09-01 | 2015-01-28 | 江苏大学 | Laser shock device and laser shock method for manufacturing morphology of surface micro-protrusions |
| CN106191385A (en) * | 2016-08-17 | 2016-12-07 | 重庆齿轮箱有限责任公司 | A kind of sheet member laser-quenching method |
| CN106367564A (en) * | 2016-09-22 | 2017-02-01 | 中车大连机车车辆有限公司 | Leaf spring single-surface medium-frequency quenching process and sensor thereof |
-
2017
- 2017-05-25 CN CN201710380556.1A patent/CN107245551A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732695A (en) * | 2012-06-23 | 2012-10-17 | 吉林大学 | Metal surface laser processing method in liquid medium |
| CN103343189A (en) * | 2013-07-19 | 2013-10-09 | 江苏大学 | Method for combinatorially reinforcing thick plate through laser shock |
| CN104308361A (en) * | 2014-09-01 | 2015-01-28 | 江苏大学 | Laser shock device and laser shock method for manufacturing morphology of surface micro-protrusions |
| CN106191385A (en) * | 2016-08-17 | 2016-12-07 | 重庆齿轮箱有限责任公司 | A kind of sheet member laser-quenching method |
| CN106367564A (en) * | 2016-09-22 | 2017-02-01 | 中车大连机车车辆有限公司 | Leaf spring single-surface medium-frequency quenching process and sensor thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108676969A (en) * | 2018-05-24 | 2018-10-19 | 上海业识科技有限公司 | The processing method for promoting boron steel body of a motor car and strength of parts by laser quenching |
| CN110295270A (en) * | 2019-06-04 | 2019-10-01 | 沈阳中科煜宸科技有限公司 | A kind of pair of thin sheet surface laser-quenching method |
| CN112662864A (en) * | 2020-12-11 | 2021-04-16 | 浙江工业大学 | Underwater quenching method for thin steel plate |
| CN114045377A (en) * | 2022-01-07 | 2022-02-15 | 北京煜鼎增材制造研究院有限公司 | Laser phase change strengthening method for surface of medium carbon steel |
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Application publication date: 20171013 |