CN104846156B - A kind of square focus spot laser multilayer interlocks and impacts uniform intensifying method - Google Patents
A kind of square focus spot laser multilayer interlocks and impacts uniform intensifying method Download PDFInfo
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- CN104846156B CN104846156B CN201510182755.2A CN201510182755A CN104846156B CN 104846156 B CN104846156 B CN 104846156B CN 201510182755 A CN201510182755 A CN 201510182755A CN 104846156 B CN104846156 B CN 104846156B
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Abstract
The present invention relates to field of laser processing, a kind of square focus spot laser multilayer is refered in particular to interlock the uniform intensifying method of impact, i.e. each layer using the equally distributed square focus spot of energy carry out it is adjacent do not overlap it is laser impact intensified, facula position is laterally and longitudinally method staggeredly uniform by a certain percentage is uniformly strengthened realizing the surface of metalwork between adjacent two layers.The method substantially eliminates the boundary effect of square focus spot, makes workpiece surface crystal grain refinement, improves the stability and reliability of large-area laser shock peening, obtains uniform reinforcing effect and high in machining efficiency.The invention can be used for the uniform intensive treatment in the surfaces such as industrial bar, casting and blade.
Description
Technical field
The inventive method is related to field of laser processing, refers in particular to a kind of square focus spot laser multilayer and interlocks the uniform reinforcing side of impact
Method, is particularly suitable for the uniform intensive treatment of the material surfaces such as industrial bar, casting and blade.
Background technology
It is laser impact intensified（It is called laser peening）It is a kind of new material surface strengthening technology, using strong laser induced
Knock wave mechanics effect material is processed, the features such as with high pressure, high energy, ultrafast and Under High Strain rate；What it was formed
Residual compressive stress layer can effectively eliminate the stress concentration of material internal and suppress the germinating and extension of crackle, can significantly improve
The fatigue life of metal parts and anticorrosive and antiwear property, substantial amounts of research have shown that reiforcing laser impact technology is extension
The crack initiation time reduces the effective means that crack propagation velocity improves material lifetime.
Common laser impact reinforcing method has some limitations, such as：During common laser shock peening treatment blade,
Easily peel off absorbed layer warpage, cause blade surface ablation, residual compressive stress field that is damaged and impacting generation and surface micro-
Pattern is uneven；Section blades extend inconsistent to length direction reinforcing effect；The laser impact intensified technique of blade surface without
Method reaches standard.
The content of the invention
In order to solve the above technical problems, interlock impacting uniform reinforcing side the invention provides a kind of square focus spot laser multilayer
Method, i.e., each layer carries out adjacent laser impact intensified, the adjacent two layers not overlapped using the equally distributed square focus spot of energy
Between facula position laterally and longitudinally method staggeredly uniform by a certain percentage is uniformly strengthened realizing the surface of metalwork；
The method substantially eliminates the boundary effect of square focus spot, makes workpiece surface crystal grain refinement, improves large-area laser shock peening
Stability and reliability, obtain uniform reinforcing effect and high in machining efficiency, realize the uniform reinforcing at blade parts edge, have
Body step is：
（1）The power output and hot spot parameter of laser are set by laser control device, makes its light spot shape be side
Shape, the length of side is a.
（2）Workpiece is arranged on five axle workbench, and absorbed layer is covered in workpiece work surface, absorbing layer surface
It is the square net of a to draw the length of side, and determines impact number of plies N altogether.
（3）Adjusting five axle workbench by digital control system makes the single grid corner of laser beam position and latticed absorbed layer
Overlap, at shock zone starting turning as the laser impact intensified treatment initial point position of ground floor, and make grid restraint layer
X-axis and Y-axis it is consistent with the X-axis and Y-axis of workbench.
（4）Using flowing water as restraint layer, laser is opened, five are controlled by digital control system using the method processed line by line
The movement of axle workbench and rotating realize carrying out workpiece work surface ground floor it is laser impact intensified, it is adjacent in impact process
Square focus spot is adjacent not to be overlapped.
（5）Absorbed layer is changed, and grid is repainted layer surface is absorbed.
（6）Adjusting five axle workbench by digital control system makes the single grid corner of laser beam position and latticed absorbed layer
Overlapping positions from the shock zone starting turning X-direction in last layer to b is offset outside shock zone, Y-direction is to shock zone
Outer skew b, as the laser impact intensified treatment initial point position of the second layer, and makes the X-axis and Y-axis of grid restraint layer and work
The X-axis of platform is consistent with Y-axis.
（7）Using flowing water as restraint layer, laser is opened, five are controlled by digital control system using the method processed line by line
The movement of axle workbench and rotating realize carrying out workpiece work surface the second layer it is laser impact intensified, it is adjacent in impact process
Square focus spot is adjacent not to be overlapped.
（8）Repeat step（5）（6）（7）, until N layers of completion is laser impact intensified.
Laser impact intensified pulse laser beam of the present invention is square hot spot, and length of side a is 2-8mm, frequency
Rate is 1-5Hz, and pulsewidth is 8-30ns, pulse energy 3-15J；Laser reinforcing impacts X-axis and Y-axis side-play amount b=a/N；Using flowing water
Used as restraint layer, thickness is 1mm；Absorption layer material is aluminium foil, and thickness is 100 μm.
Impact number of plies N determines according to experiment material property and laser-impact threshold value, is 3-5 layers.
Beneficial effects of the present invention：The boundary effect of square focus spot is eliminated, workpiece surface crystal grain refinement improves large area and swashs
The stability and reliability of light shock peening, obtain uniform reinforcing effect and high in machining efficiency.
Brief description of the drawings
Fig. 1 impacts the schematic diagram of uniform intensifying method for square focus spot laser multilayer interlocks.
Fig. 2 is the workpiece surface metallographic structure after uniform intensifying method treatment.
Fig. 3 is undressed workpiece surface metallographic structure.
Fig. 4 is two groups of sample detection site surface residual stress value curves.
Fig. 5 is two groups of sample detection site superficial hardness number curves.
Fig. 6 impacts the flow process chart of uniform intensifying method for square focus spot laser multilayer interlocks.
Specific embodiment
The present invention is described in detail below in conjunction with the accompanying drawings.
The matrix of samples material that the present embodiment is used is 316L stainless steels, its physical dimension be 140mm ×
70mm×25mm。
The technological parameter of laser is：Pulsewidth 8ns, frequency 1Hz, pulse energy 6J, light spot shape are square, spot size
A is 5mm, and adjacent prismatic hot spot is adjacent not to be overlapped.
Concretely comprise the following steps：
（1）The power output and hot spot parameter of laser are set by laser control device, makes its light spot shape be side
Shape, the length of side is 5mm.
（2）Workpiece is arranged on five axle workbench, and absorbed layer is covered in workpiece work surface, absorbing layer surface
It is the square net of a to draw the length of side, and determines impact number of plies N altogether；According to experiment material property and laser-impact threshold value come really
Surely number of plies N is impacted, N=5 is taken.
（3）Adjusting five axle workbench by digital control system makes the single grid corner of laser beam position and latticed absorbed layer
Overlap, at shock zone starting turning as the laser impact intensified treatment initial point position of ground floor, and make grid restraint layer
X-axis and Y-axis it is consistent with the X-axis and Y-axis of workbench.
（4）Using flowing water as restraint layer, laser is opened, five are controlled by digital control system using the method processed line by line
The movement of axle workbench and rotating realize carrying out workpiece work surface ground floor it is laser impact intensified, it is adjacent in impact process
Square focus spot is adjacent not to be overlapped.
（5）Absorbed layer is changed, and grid is repainted layer surface is absorbed.
（6）Adjusting five axle workbench by digital control system makes the single grid corner of laser beam position and latticed absorbed layer
Overlapping positions from the shock zone starting turning X-direction in last layer to 1mm is offset outside shock zone, Y-direction is to impact zone
Overseas skew 1mm, as the laser impact intensified treatment initial point position of the second layer, and make the X-axis and Y-axis of grid restraint layer with
The X-axis of workbench is consistent with Y-axis.
（7）Using flowing water as restraint layer, laser is opened, five are controlled by digital control system using the method processed line by line
The movement of axle workbench and rotating realize carrying out workpiece work surface the second layer it is laser impact intensified, it is adjacent in impact process
Square focus spot is adjacent not to be overlapped；
（8）Repeat step（5）（6）（7）, until 5 layers of completion is laser impact intensified.
Choose two parallel lines along Y direction in the square region on workpiece treatment surface, two parallel lines at a distance of 15mm,
With square region side at a distance of 5mm, decile takes six points on every straight line, and spacing is 5mm, totally 12 points, to the residual of sample point
Residue stress and hardness are tested and analyzed.
Arranged as shown in Fig. 2 by the workpiece surface crystal grain refinement of intensive treatment, between crystal grain closely in order, obtain compared with
Good uniform reinforcing effect.And in Fig. 3, the workpiece surface crystal grain arrangement without intensive treatment is disorderly and unsystematic and intercrystalline
Gap is larger.
As shown in Figure 4,5, in 280MPa or so, hardness value stabilization exists the surface residual stress value stabilization that detection is obtained
350Hv or so, it can be deduced that conclusion：Interlocking by square focus spot laser multilayer, it is notable to impact the uniform workpiece surface performance strengthened
Improve, the refinement of workpiece material surface layer grain improves the stability and reliability of large-area laser shock peening, obtains uniform reinforcing
Effect and high in machining efficiency.
Claims (2)
1. a kind of square focus spot laser multilayer interlocks the uniform intensifying method of impact, it is characterised in that comprise the following steps that：
(1) power output and hot spot parameter of laser are set by laser control device, makes its light spot shape be square, side
A length of a；
(2) workpiece is arranged on five axle workbench, and absorbed layer is covered in workpiece work surface, in absorbed layer surface rendering
The length of side is the square net of a, and impact number of plies N is determined according to experiment material property and laser-impact threshold value；
(3) adjusting five axle workbench by digital control system makes the single grid corner weight of laser beam position and latticed absorbed layer
Close, at shock zone starting turning as the laser impact intensified treatment initial point position of ground floor, and make the X of grid restraint layer
Axle and Y-axis are consistent with the X-axis and Y-axis of workbench；
(4) using flowing water as restraint layer, laser is opened, five axle works is controlled by digital control system using the method processed line by line
Make the movement of platform and rotating and realize carrying out workpiece work surface ground floor laser impact intensified, adjacent prismatic in impact process
Hot spot is adjacent not to be overlapped；
(5) absorbed layer is changed, and grid is repainted layer surface is absorbed；
(6) adjusting five axle workbench by digital control system makes the weight of laser beam position and the single grid corner of latticed absorbed layer
Position is closed from the shock zone starting turning X-direction in last layer to offseting b outside shock zone, Y-direction to outside shock zone partially
B is moved, as the laser impact intensified treatment initial point position of the second layer, and makes the X-axis and Y-axis of grid restraint layer and workbench
X-axis is consistent with Y-axis；
(7) using flowing water as restraint layer, laser is opened, five axle works is controlled by digital control system using the method processed line by line
Make the movement of platform and rotating and realize carrying out workpiece work surface the second layer laser impact intensified, adjacent prismatic in impact process
Hot spot is adjacent not to be overlapped；
(8) repeat step (5) (6) (7), until N layers of completion is laser impact intensified；
The length of side a of the square focus spot is 2-8mm；The laser impact intensified technological parameter is：Laser frequency is 1-5Hz,
Pulsewidth is 8-30ns, and pulse energy is 3-15J；It is the shock ply number of plies, N that laser reinforcing impacts X-axis and Y-axis side-play amount b=a/N, N
Value is 3-5.
2. a kind of square focus spot laser multilayer as claimed in claim 1 interlocks the uniform intensifying method of impact, it is characterised in that：Adopt
With flowing water as restraint layer, thickness is 1mm；Absorption layer material is aluminium foil, and thickness is 100 μm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2796661C1 (en) * | 2022-09-19 | 2023-05-29 | Федеральное государственное бюджетное учреждение науки Пермский федеральный исследовательский центр Уральского отделения Российской академии наук (ПФИЦ УрО РАН) | Method for processing a flat billet made of titanium alloy with a stress concentrator |
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| CN105002349B (en) * | 2015-07-21 | 2017-05-03 | 江苏大学 | Method for conducting variable-light-spot multilayer staggered laser shock homogeneous enhancement on blades |
| CN105925792B (en) * | 2016-07-08 | 2018-10-19 | 中国科学院长春光学精密机械与物理研究所 | Laser impact intensified system |
| CN106282532B (en) * | 2016-08-18 | 2018-01-16 | 江苏大学 | A kind of laser impact intensified combined method for obtaining metal surface crystal grain mixed distribution |
| CN106446517B (en) * | 2016-08-30 | 2019-04-30 | 江苏大学 | A kind of modeling of laser impact intensified alloy plastic deformation's depth and method of discrimination |
| CN107937707B (en) * | 2017-11-28 | 2019-11-08 | 广东工业大学 | A kind of method and system of pulse laser reinforced metal |
| CN110885920A (en) * | 2019-10-29 | 2020-03-17 | 天津修船技术研究所(中国船舶重工集团公司第六三一三研究所) | Method for strengthening exhaust valve seat of cylinder cover of special cast iron diesel engine |
| CN111944989B (en) * | 2020-09-04 | 2021-09-14 | 武汉大学 | Method for rapidly selecting area laser reinforcement |
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| JPS6336991A (en) * | 1986-07-30 | 1988-02-17 | Komatsu Ltd | Laser beam molding device |
| CN103526010B (en) * | 2013-10-28 | 2015-01-14 | 东南大学 | Method and device for reinforcement of hole structure by utilization of square laser spot shock wave |
| CN104164538B (en) * | 2014-07-16 | 2017-02-22 | 江苏大学 | Laser shock reinforcing method for obtaining large area uniform surface morphology |
| CN104164554A (en) * | 2014-07-16 | 2014-11-26 | 江苏大学 | Method for reinforcement of metal surface by large area laser shock |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2796661C1 (en) * | 2022-09-19 | 2023-05-29 | Федеральное государственное бюджетное учреждение науки Пермский федеральный исследовательский центр Уральского отделения Российской академии наук (ПФИЦ УрО РАН) | Method for processing a flat billet made of titanium alloy with a stress concentrator |
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