CN102409157A - Intensifying method by hollow laser - Google Patents
Intensifying method by hollow laser Download PDFInfo
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- CN102409157A CN102409157A CN2011103708742A CN201110370874A CN102409157A CN 102409157 A CN102409157 A CN 102409157A CN 2011103708742 A CN2011103708742 A CN 2011103708742A CN 201110370874 A CN201110370874 A CN 201110370874A CN 102409157 A CN102409157 A CN 102409157A
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Abstract
The invention discloses a high-efficiency intensifying method by hollow laser. The method is characterized in that: an annular high-energy laser light spot acts on the surface of a member with an energy absorption layer and a restraint layer; and certain residual compressive stress is formed on the surface of the member after the member is affected by impact waves induced by the laser, so that the member is intensified. The method comprises the following steps of: acquiring internal and external dimensions of an annular light spot which does not generate stress holes by a test piece method; and acting on the surface of the member with the energy absorption layer and the restraint layer by using the effect of the annular light spot, so that the member has the optimal intensification effect. By the method, the problem of the stress holes generated when high-power large-light-spot solid laser is used for impacts is effectively solved; and by the method, a good intensification effect is achieved, the efficiency is high, and production cost is saved.
Description
Technical field
The present invention relates to material surface modifying, refer in particular to a kind of efficient hollow laser reinforcing method, the big area high-level efficiency that is particularly useful for member is strengthened.
Background technology
Reiforcing laser impact technology is to utilize superpower, short-pulse laser irradiation metal material surface; Material surface is heated and gasifies and the generation plasma body; Because the blast of plasma body produces shockwave at metal material surface; The peak pressure of shockwave can reach 10GPa, and under this effect, the mechanical property of material is significantly improved.Domestic and international research shows, laser impact intensified can effectively the raising hardness of metal materials and fatigue lifetives such as duraluminum, titanium alloy, carbon steel, nickel-base alloy, stainless steel, cast iron.The raising of material fatigue life mainly is because the existence of surface compress residual stresses simultaneously, is impacted high density dislocation and position change mutually that the back exists in material, and the hardness of material and stress in bending are improved.Laser impact intensified with traditional reinforcing process such as shot peening strengthening, forge and compare, surface compress residual stresses is big, and intensity is high, and is effective, is a kind of cleaning, non-harmful treatment process.
In order to improve the efficient of laser-impact; Adopt the laser of macro-energy large spot that material is strengthened; But to the influence that residual stress field, plate top layer distributes, show that improving laser power density can increase the plate surface residual stress, but can produce the unrelieved stress disappearance along with power density increases through research laser power density, light spot shape; Be referred to as " unrelieved stress hole " phenomenon, influence strengthening effect; The reason that produces " unrelieved stress hole " is that the rarefaction wave that when impacting with the intensity laser device, produces is more intense; The zone, center of impact can produce reverse viscous deformation; Thereby can reduce the elasticity residual compressive stress of this zone, unrelieved stress hole phenomenon occur in steady state.
The patent No. is called the patent of " Altering Material Properties " for the US3850698 name; The patent No. is called the patent of " Laser Shock Processing " and the patent No. is called " Laser Peening Systerm and Method " for the US4937421 name patent for the US4401477 name; The ballistic mode strengthening workpiece of utilization pulse laser; For material surface strengthening provides new thinking, its shock wave peak pressure is bigger than traditional shot-peening, and it is darker to strengthen the degree of depth.But the method that these patents propose is only used the small light spot strengthening workpiece, and its efficient is extremely low, and when increasing spot diameter increase energy, producing " unrelieved stress hole " possibly influences strengthening effect.
Through difform intensity laser hot spots such as employing circular light spot, oval hot spot, square focus spot, hollow hot spots plate is impacted, and the test unrelieved stress, the result shows the appearance of adopting the hollow light spot laser can effectively avoid the unrelieved stress hole.
Summary of the invention
The purpose of this invention is to provide the generation in a kind of can avoiding " unrelieved stress hole ", realize the method for the high efficiency hollow laser reinforcing of various metallic substance big area, present method can improve reinforcement efficient, saves production cost.
The present invention realizes according to following technical proposals: adopt high-power pulsed laser; The adjustable laser bundle that high-power pulsed laser is sent forms the hollow light beam through light path system; Irradiation forms ring-shaped light spot in component surface; Through regulating external diameter size and ratio in the ring-shaped light spot, make member receive the radiation-induced shockwave of the big ring-shaped light spot of this macro-energy, the residual compressive stress that component surface is formed does not have " stress hole " distributes; Thereby make member improve the ability of antifatigue and stress corrosion, the step of this enhancement method is:
A) adopt finite element analysis software to find external diameter size and boss ratio rate thereof in the ring-shaped light spot that does not produce " stress hole ", confirm processing parameters such as laser pulse width, pulse energy, laser facula size;
B) preparation test piece, the polishing pre-treatment is carried out in test piece, and the surface attaches the absorption layer of subsides, restraint layer;
C) with test piece with clamps on numerical control table, NC table, according to A) determined process parameters range carries out shock test;
D) measure the residual stress distribution of impacting the back test piece;
E) repeating step B), C), D), find the interior external diameter and the boss ratio rate of the ring-shaped light spot that does not produce " stress hole ", confirm processing parameters such as laser pulse width, pulse energy, laser facula size;
F) treat reinforcement members and carry out pre-treatment,, regulate light path system, start laser apparatus and carry out laser impact intensified member according to above processing parameter;
G) take off member, the cleaning surface;
H) repeating step F), G), accomplish the laser impact intensified of next member.
The interior external diameter of above-mentioned selected ring-shaped light spot is relevant with the material and the treated state of the PW of high-power pulsed laser, pulse energy, spot size, member; Laser pulse width 0.1ns ~ the 10ns of high power laser, energy 0 ~ 200J, beam diameter 0.1 ~ 50mm; The internal diameter of ring-shaped light spot
satisfies condition:
, external diameter
satisfies condition:
.
The material of above-mentioned prepared test piece is consistent with the material properties of member, and test piece is shaped as square, and the length of side is 50mm, thickness and member consistency of thickness.
The absorption layer that is covered in the test piece and restraint layer with treating reinforcement members on the absorption layer and the restraint layer that are covered consistent; Wherein absorption layer comprises aluminium foil, pitch-dark, black tape, and restraint layer comprises water, K9 opticglass, synthetic glass, silica gel, synthetic resins.
The present invention has following technical superiority:
1) with traditional reinforcing process such as shot peening strengthening, roll and compare, surface compress residual stresses is big, intensity is high, and is effective, is a kind of cleaning, non-harmful treatment process.
2) adopt hollow laser impact intensified; The rarefaction wave that the impact zone outer edge produces converges to the center, and the rarefaction wave that inner boundary produces is outwards dispersed, and the stack of two ripples is offset; " stress hole " problem that can effectively avoid the large spot macro-energy to cause, stress distribution is more reasonable.
3) use of large spot macro-energy effectively solves the inefficient problem of big area shock peening, and it is high to strengthen efficient.
4) adopt large spot macro-energy hollow laser to carry out shock peening, the component surface roughness is littler after impacting.
5) adopt large spot macro-energy hollow laser to carry out shock peening, it is low to reduce cost, and no matter military or civilian all have a clear superiority.
Make component surface produce residual compressive stress, the fatigue lifetime of improving member widely, anti-stress corrosion performance power when 6) impacting.
Description of drawings
Fig. 1 apparatus of the present invention synoptic diagram.
1 high power laser, 2 optics become beam system, and 3 hollow laser form system, 4 members, 5 numerical control table, NC tables, 6 computer control systems.
Specific embodiments
Adopt high-power pulsed laser, the adjustable laser bundle that high-power pulsed laser is sent forms the hollow light beam through light path system, and irradiation forms ring-shaped light spot in component surface; Through regulating external diameter size and ratio in the ring-shaped light spot; Make member receive the radiation-induced shockwave of the big ring-shaped light spot of this macro-energy, the residual compressive stress that component surface is formed does not have " stress hole " distributes, thereby makes member improve the ability of antifatigue and stress corrosion; It is characterized in that: member receives the radiation-induced shockwave effect of macro-energy ring-shaped light spot; Make component surface form certain residual compressive stress, thereby make member obtain to strengthen, the step of this enhancement method is:
A) adopt finite element analysis software to find external diameter size and boss ratio rate thereof in the ring-shaped light spot that does not produce " stress hole ", confirm processing parameters such as laser pulse width, pulse energy, laser facula size;
B) preparation test piece, the polishing pre-treatment is carried out in test piece, and the surface attaches the absorption layer of subsides, restraint layer;
C) with test piece with clamps on numerical control table, NC table, according to A) determined process parameters range carries out shock test;
D) measure the residual stress distribution of impacting the back test piece;
E) repeating step B), C), D), find the interior external diameter and the boss ratio rate of the ring-shaped light spot that does not produce " stress hole ", confirm processing parameters such as laser pulse width, pulse energy, laser facula size;
F) treat reinforcement members and carry out pre-treatment,, regulate light path system, start laser apparatus and carry out laser impact intensified member according to above processing parameter;
G) take off member, the cleaning surface;
H) repeating step F), G), accomplish the laser impact intensified of next member.The interior external diameter of above-mentioned selected ring-shaped light spot is relevant with the material and the treated state of the PW of high-power pulsed laser, pulse energy, spot size, member; Laser pulse width 0.1ns ~ the 10ns of high power laser, energy 0 ~ 200J, beam diameter 0.1 ~ 50mm; The internal diameter of ring-shaped light spot
satisfies condition:
, external diameter
satisfies condition:
.
The material of above-mentioned prepared test piece is consistent with the material properties of member, and test piece is shaped as square, and the length of side is 50mm, thickness and member consistency of thickness.The absorption layer that is covered in the test piece and restraint layer with treating reinforcement members on the absorption layer and the restraint layer that are covered consistent; Wherein absorption layer comprises aluminium foil, pitch-dark, black tape, and restraint layer comprises water, K9 opticglass, synthetic glass, silica gel, synthetic resins.
Claims (5)
1. hollow laser reinforcing method; Adopt high-power pulsed laser, the adjustable laser bundle that high-power pulsed laser is sent forms the hollow light beam through the shaping light path system, and irradiation forms ring-shaped light spot in component surface; It is characterized in that: through regulating external diameter size and ratio in the ring-shaped light spot; Make member receive the radiation-induced shockwave of the big ring-shaped light spot of this macro-energy, the residual compressive stress that component surface is formed does not have " stress hole " distributes, and makes member improve the ability of antifatigue and stress corrosion.
2. a kind of efficient hollow laser reinforcing method according to claim 1, it is characterized in that: concrete steps are:
A) adopt finite element analysis software to find external diameter size and boss ratio rate thereof in the ring-shaped light spot that does not produce " stress hole ", confirm laser pulse width, pulse energy, laser facula size processing parameter;
B) preparation test piece, the polishing pre-treatment is carried out in test piece, and the surface attaches the absorption layer of subsides, restraint layer;
C) with test piece with clamps on numerical control table, NC table, according to A) determined process parameters range carries out shock test;
D) measure the residual stress distribution of impacting the back test piece;
E) repeating step B), C), D), find the interior external diameter and the boss ratio rate of the ring-shaped light spot that does not produce " stress hole ", and definite laser pulse width, pulse energy, laser facula size processing parameter;
F) treat reinforcement members and carry out pre-treatment,, regulate light path system, start laser apparatus and carry out laser impact intensified member according to above processing parameter;
G) take off member, the cleaning surface;
H) repeating step F), G), accomplish the laser impact intensified of next member.
3. a kind of efficient hollow laser reinforcing method according to claim 2; It is characterized in that: the interior external diameter of selected ring-shaped light spot is relevant with the material and the treated state of the PW of high-power pulsed laser, pulse energy, spot size, member; Laser pulse width 0.1ns ~ the 10ns of high power laser, energy 0 ~ 200J, beam diameter 0.1 ~ 50mm; The internal diameter of ring-shaped light spot
satisfies condition:
, external diameter
satisfies condition:
.
4. a kind of efficient hollow laser reinforcing method according to claim 2, it is characterized in that: the material of prepared test piece is consistent with the material properties of member, and test piece is shaped as square, length of side 60mm, thickness and member consistency of thickness.
5. a kind of efficient hollow laser reinforcing method according to claim 2 is characterized in that: the absorption layer that is covered in the test piece and restraint layer with treating reinforcement members on the absorption layer and the restraint layer that are covered consistent; Absorption layer is aluminium foil, pitch-dark, black tape, and restraint layer comprises water, K9 opticglass, synthetic glass, silica gel or synthetic resins.
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| CN2011103708742A CN102409157A (en) | 2011-11-21 | 2011-11-21 | Intensifying method by hollow laser |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103361469A (en) * | 2013-07-19 | 2013-10-23 | 江苏大学 | Pressurizing device for laser shock reinforcement |
| CN103668171A (en) * | 2013-12-25 | 2014-03-26 | 江苏万力机械股份有限公司 | Combined treatment method for prolonging life of oversized shearing equipment tool |
| CN104726688A (en) * | 2015-02-10 | 2015-06-24 | 江苏大学 | Designing method of flange inner ball cage extruding mold by considering laser shock effect |
| CN106435158A (en) * | 2016-10-09 | 2017-02-22 | 南通大学 | Workpiece surface laser shocking process utilizing surface micro textures for removing residual stress holes |
| CN106480304A (en) * | 2017-01-03 | 2017-03-08 | 中国矿业大学 | A kind of micro- stress peening method of micro- texture surface selective laser |
| CN107177807A (en) * | 2017-07-22 | 2017-09-19 | 西北有色金属研究院 | A kind of preparation method of face-centred cubic structure titanium |
| CN108480631A (en) * | 2018-03-30 | 2018-09-04 | 中国航发北京航空材料研究院 | A method of for improving laser gain material manufacture component residual compressive stress |
| CN108660400A (en) * | 2017-03-31 | 2018-10-16 | 中国科学院沈阳自动化研究所 | A kind of laser shock peening method of nickel base superalloy |
| CN110026686A (en) * | 2019-05-28 | 2019-07-19 | 广东工业大学 | A kind of laser shock method, device and equipment |
| CN110512071A (en) * | 2019-08-28 | 2019-11-29 | 江苏大学 | A kind of impact of hollow laser and supersonic synergic strengthen antifatigue device and processing method |
| CN113372863A (en) * | 2021-06-22 | 2021-09-10 | 深圳市汇海鑫科技有限公司 | High-thermal-conductivity and high-electric-conductivity organic adhesive and preparation method thereof |
| US11542571B2 (en) * | 2017-05-04 | 2023-01-03 | Jiangsu University | Laser shock and supersonic vibration extrusion co-strengthening device and method |
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| CN101745740A (en) * | 2009-12-23 | 2010-06-23 | 江苏大学 | Metal plate material ring-shaped light spot laser impact forming method and device |
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| CN101745740A (en) * | 2009-12-23 | 2010-06-23 | 江苏大学 | Metal plate material ring-shaped light spot laser impact forming method and device |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103361469A (en) * | 2013-07-19 | 2013-10-23 | 江苏大学 | Pressurizing device for laser shock reinforcement |
| CN103668171A (en) * | 2013-12-25 | 2014-03-26 | 江苏万力机械股份有限公司 | Combined treatment method for prolonging life of oversized shearing equipment tool |
| CN104726688A (en) * | 2015-02-10 | 2015-06-24 | 江苏大学 | Designing method of flange inner ball cage extruding mold by considering laser shock effect |
| CN104726688B (en) * | 2015-02-10 | 2017-07-18 | 江苏大学 | A kind of flange internal spherical cage Extrusion Die Design method for considering laser impact effect |
| CN106435158B (en) * | 2016-10-09 | 2017-12-15 | 南通大学 | The workpiece surface laser-impact technique in residual stress hole is removed using the micro- texture in surface |
| CN106435158A (en) * | 2016-10-09 | 2017-02-22 | 南通大学 | Workpiece surface laser shocking process utilizing surface micro textures for removing residual stress holes |
| CN106480304B (en) * | 2017-01-03 | 2018-04-17 | 中国矿业大学 | A kind of micro- micro- stress peening method of texture surface selective laser |
| CN106480304A (en) * | 2017-01-03 | 2017-03-08 | 中国矿业大学 | A kind of micro- stress peening method of micro- texture surface selective laser |
| CN108660400A (en) * | 2017-03-31 | 2018-10-16 | 中国科学院沈阳自动化研究所 | A kind of laser shock peening method of nickel base superalloy |
| CN108660400B (en) * | 2017-03-31 | 2019-10-25 | 中国科学院沈阳自动化研究所 | A kind of laser shock peening method of nickel base superalloy |
| US11542571B2 (en) * | 2017-05-04 | 2023-01-03 | Jiangsu University | Laser shock and supersonic vibration extrusion co-strengthening device and method |
| CN107177807A (en) * | 2017-07-22 | 2017-09-19 | 西北有色金属研究院 | A kind of preparation method of face-centred cubic structure titanium |
| CN108480631A (en) * | 2018-03-30 | 2018-09-04 | 中国航发北京航空材料研究院 | A method of for improving laser gain material manufacture component residual compressive stress |
| CN110026686A (en) * | 2019-05-28 | 2019-07-19 | 广东工业大学 | A kind of laser shock method, device and equipment |
| CN110026686B (en) * | 2019-05-28 | 2021-07-02 | 广东工业大学 | Laser impact method, device and equipment |
| CN110512071A (en) * | 2019-08-28 | 2019-11-29 | 江苏大学 | A kind of impact of hollow laser and supersonic synergic strengthen antifatigue device and processing method |
| CN113372863A (en) * | 2021-06-22 | 2021-09-10 | 深圳市汇海鑫科技有限公司 | High-thermal-conductivity and high-electric-conductivity organic adhesive and preparation method thereof |
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Application publication date: 20120411 |