CN104833786A - Detection method of hot shear cutter material laser shock residual stress thermal relaxation - Google Patents
Detection method of hot shear cutter material laser shock residual stress thermal relaxation Download PDFInfo
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Abstract
The invention provides a detection method of hot shear cutter material laser shock residual stress thermal relaxation. The detection method comprises following steps: a hot shear cutter material is cut into cuboid small pieces, and the length, width, and height of the cuboid small pieces are measured; a geometric model is constructed in simulation software ANSYS/LS_DYNA, and a finite element model is obtained via unit selection, mapped meshing, constitutive model selection, and boundary condition application; laser parameters are set, simulation of laser shock on the finite element model is carried out in a S-shaped light spot impact trajectory; surface residual stress and depth residual stress of the finite element model are measured after impact; at a same thermal holding time, temperature load of the finite element model is changed, and surface residual stress and depth residual stress of the finite element model are measured, so that residual stress thermal relaxation under different temperature load is obtained. Operation of the detection method is simple and convenient; detection efficiency is high; cost is low; the detection method is friendly to the environment; no pollution is caused; and optimum parameters can be provided for subsequent hot shear cutter impact modification.
Description
Technical field
The invention belongs to machine-building, material processed processing detects analysis technical field, especially relate to a kind of detection method of hot shears cutter material laser-impact unrelieved stress hot wire-CVD.
Background technology
In advanced manufacturing technology, laser shocking processing technology is as the Typical Representative of high energy beam, and be a kind of manufacturing process with good prospect, its principle is the surface interaction utilizing junior engineering college and material, modification is carried out to material surface, especially fatigue lifetime.This technology is widely applied in all trades and professions such as mechanical engineering, boats and ships, aviation, microelectronics, and this technology is mainly used in material modification, metal impact strengthening and is shaped at present, and the aspect such as Non-Destructive Testing.
Finite element analysis software ANSYS/LS_DYNA is as display dynamic analysis finite element program, very useful for the research solving non-linear high speed dynamic crash.The visual result of all kinds of engineering problem can reflect by finite element analogy, result of calculation file can be used dynamic evolution process repeatedly to be shown, such as can react the communication process of laser blast wave in metal material intuitively, to abundant understanding problem provides huge help from entirety to local.
Large-scale hot shears is the visual plant in machine building industry.The shearing machine blade being in hot shears implements shearing blanking to the steel material in the bloom steel ironworks of about 800 ~ 1000 DEG C, except requiring to have very strong impact flexibility and elevated temperature strength, for cutting edge roundness surface, also need very strong hardness and stronger wearing quality and thermal stability, thermal fatigue resistance; All unrelieved stress can be produced in the course of the work, but the existence of unrelieved stress hot wire-CVD not only can reduce the rigidity of structure and stability but also under the acting in conjunction of temperature and medium, also can have a strong impact on the ability of the fatigue strength of structure, anti-brittle failure ability, opposing stress corrosion crack and high-temerature creep cracking.
Summary of the invention
For Shortcomings in prior art, the invention provides a kind of detection method of hot shears cutter material laser-impact unrelieved stress hot wire-CVD, be intended to reach convenient, fast and object that is efficient detection unrelieved stress hot wire-CVD.
The present invention realizes above-mentioned technical purpose by following technological means.
A detection method for hot shears cutter material laser-impact unrelieved stress hot wire-CVD, comprises the steps:
(1) finite element model of hot shears cutter material is set up:
Hot shears cutter material is cut to rectangle fritter, measure length and width and the height of rectangle fritter, in simulation softward ANSYS/LS_DYNA centered by Y-axis axis of symmetry, X-Z plane is the geometric model that laser-impact plane creates rectangle fritter, through Unit selection, stress and strain model, selects constitutive model and after applying boundary condition, obtains the finite element model of hot shears cutter material;
(2) finite element model simulated laser is impacted:
Setting laser parameter, hot spot impacts track and carries out simulated laser impact according to " S " type to finite element model, finite element model after must impacting;
(3) the unrelieved stress hot wire-CVD of finite element model is detected;
Measure surface residual stress and the degree of depth unrelieved stress of finite element model after impacting; Subsequently, under identical temperature retention time, change the temperature loading of finite element model, measure surface residual stress and the degree of depth unrelieved stress of this finite element model under different temperatures load, draw the unrelieved stress hot wire-CVD under different temperatures load thus.
Further, described in step (1), the material of hot shears cutter to be measured is 6CrW2Si steel.
Further, described in step (1), the length of rectangle fritter is 10cm, and wide is 10cm, and height is 5cm.
Further, Unit selection described in step (1) is 8 node hexahedral element SOLID164; Described stress and strain model process is that spot radius 2 times of length areas carry out mesh refinement on three axes, and all the other adopt sparse grid; Described material constitutive model selects JC model; Described applying boundary condition is for applying symmetry constraint.
Further, described in step (2), laser parameter is as follows: laser energy is 8J, and laser power density is 11.3GW/cm2, and the output wavelength of laser is 10.6um, and laser blast wave load pressure is 3.3GPa.
Further, the detection path of surface residual stress described in step (3) is that described laser-impact hot spot surveys a point, to 5mm place every 0.5mm in the X-axis direction; It is that described laser-impact hot spot surveys a point, to 0.7mm every 0.05mm in the Y-axis direction that described degree of depth unrelieved stress detects path.
Further, described laser-impact hot spot is circular light spot, and radius is 1.5mm.
Further, different temperatures load described in step (3) is 300 DEG C, 400 DEG C, 500 DEG C, 600 DEG C.
Further, described in step (3), temperature retention time is 10min.
Beneficial effect of the present invention:
The detection method of hot shears cutter material laser-impact unrelieved stress hot wire-CVD of the present invention utilizes finite element method to set up the finite element model of hot shears cutter, simulate its laser-impact and change temperature loading, detect the unrelieved stress under different temperatures, thus draw unrelieved stress hot wire-CVD; The method is easy and simple to handle, detection efficiency is high, cost is low, environment friendly and pollution-free.The present invention, by demonstration test, further determined that reliability and the accuracy of this detection method, can provide optimal parameter for the impact modified of subsequent thermal scissors tool.
Accompanying drawing explanation
Fig. 1 is unrelieved stress-surface distance figure under condition of different temperatures under emulation mode of the present invention.
Fig. 2 is unrelieved stress-depth distance figure under condition of different temperatures under emulation mode of the present invention.
Fig. 3 is unrelieved stress-surface distance figure under condition of different temperatures under experimental state of the present invention.
Fig. 4 is unrelieved stress-depth distance figure under condition of different temperatures under experimental state of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to this.
A detection method for hot shears cutter material laser-impact unrelieved stress hot wire-CVD, comprises the steps:
(1) finite element model of hot shears cutter material is set up:
By hot shears cutter material 6CrW2Si steel, be cut to the rectangle fritter that length is respectively 10cm, 10cm, 5cm, in simulation softward ANSYS/LS_DYNA centered by Y-axis axis of symmetry, X-Z plane is that laser-impact plane creates its geometric model; Unit selection is 8 node hexahedral element SOLID164; Stress and strain model process is that spot radius 2 times of length areas carry out mesh refinement on three axes, and all the other adopt sparse grid; JC model is selected to be constitutive model; Applying symmetry constraint for applying boundary condition, obtaining finite element model;
(2) finite element model simulated laser is impacted:
Setting laser parameter is carried out simulation to finite element model and is impacted, and described laser parameter is as follows: laser energy is 8J, and laser power density is 11.3GW/cm
2, the output wavelength of laser is 10.6um, and laser blast wave load pressure is 3.3GPa, obtains impacting rear finite element model;
(3) the unrelieved stress hot wire-CVD of finite element model is detected:
Measure surface residual stress and the degree of depth unrelieved stress of finite element model after impacting, its detection method is:
Described laser-impact hot spot surveys a point every 0.5mm in the X-axis direction, to 5mm place, obtains surface residual stress; Described laser-impact hot spot surveys a point every 0.05mm in the Y-axis direction, to 0.7mm, obtains degree of depth unrelieved stress; Wherein, laser-impact hot spot is circular light spot, and radius is 1.5mm.Subsequently, determine that temperature retention time is 10min, the temperature loading of setting finite element model is respectively 300 DEG C, 400 DEG C, 500 DEG C, 600 DEG C, obtains the unrelieved stress-distance map under above-mentioned different temperatures, draws unrelieved stress hot wire-CVD thus.
As can be seen from Figure 1, compared with laser-impact gained unrelieved stress under room temperature, along with the rising of temperature, the absolute value of unrelieved stress reduces; Temperature is higher, and the amplitude that the absolute value of its unrelieved stress reduces is larger, then surface residual stress hot wire-CVD is more, and unrelieved stress is more unstable; When exceeding 2mm apart from spot center distance, its unrelieved stress is almost close to zero, and surface residual stress is completely lax; As can be seen from Figure 2, compared with laser-impact gained unrelieved stress under room temperature, along with the rising of temperature, the absolute value of unrelieved stress reduces; Temperature is higher, and it is more that the absolute value of its unrelieved stress reduces, and degree of depth unrelieved stress hot wire-CVD is more obvious, and when the depth distance that distance is surperficial is greater than 0.7mm, its unrelieved stress is almost close to zero, and degree of depth unrelieved stress is completely lax.
In order to verify the correctness of detection method of the present invention further, the hot shears cutter to be measured choosing same material 6CrW2Si steel utilizes laser impact intensified experimental provision to carry out laser impact intensified process experiment, heat-treatment furnace is utilized to heat-treat experiment subsequently, finally utilize stress determination instrument to measure its unrelieved stress, detailed process is as follows:
(1) laser impact intensified: to adopt the laser impact intensified experimental provision be made up of computer control system, superpower laser, automatic sprinkler and worktable to carry out laser impact intensified.
With the surface of alcohol washes metal material, at the aluminium foil absorption layer of its surface coverage 0.1mm to strengthen absorption to laser energy, metal material is fixed on the fixture of worktable, relative with the laser beam making metal material surface can send with laser instrument; Control automatic sprinkler to aluminium foil absorption layer surface sprinkling by computer control system, thus form the moisture film of 1-2mm on aluminium foil absorption layer surface, as restraint layer time laser impact intensified; Then control worktable by computer control system to move according to " S " type laser facula impact track of setting; Control superpower laser by computer control system to give off laser beam to aluminium foil absorption layer, described laser beam in aluminium foil absorption layer, thus produces residual compressive stress layer at metal material surface through moisture film and irradiation; Finally the fixture of metal material from worktable is lifted down, remove aluminium foil absorption layer; The sample altogether impacted has 4 (Sample A, sample B, sample C, sample D); The each parameter of above-mentioned laser-impact and laser facula impact track and all impact in step identical with simulated laser in the inventive method.
(2) thermal treatment and unrelieved stress detect:
Adopt the sample of X-350A type X ray measuring stress instrument to laser-impact at ambient temperature to carry out the detection of surface residual stress and degree of depth unrelieved stress, its check point choose with detect in the inventive method in unrelieved stress identical;
Subsequently, heat-treat above-mentioned 4 impact specimens respectively in SX2-15-13 heat-treatment furnace, heat treatment time is 10min, and the heat treatment temperature of Sample A, sample B, sample C and sample D is respectively 300 DEG C, 400 DEG C, 500 DEG C and 600 DEG C.Carry out the detection of surface residual stress and degree of depth unrelieved stress to 4 impact specimens after process, first point surveyed by each sample by laser-impact spot center, then radial direction surfacewise, surveys a point, to 5mm place every 0.5mm; The direction unrelieved stress that fathoms adopts electropolishing method to carry out successively overburden removing material and measures, and every layer of cover thickness is 0.05mm, to 0.7mm place, and then obtains Fig. 3 and Fig. 4.Wherein, each parameter of X-350A type X ray measuring stress instrument is as follows: adopt side-oblique fixed psi process as measuring method, hands over correlation method as peak location method, radiation is CrK α, ψ angle is 0 °, 25 °, 35 °, 45 °, and 2 θ angles are 131 ° ~ 124 °, and 2 θ angle sweep step pitches are 0.10 °, time constant is 1.00s, X-ray tube high pressure is 20.0KV, and X-ray tube electric current is 5.0mA, and collimator diameter is 2mm, diffraction crystal face is 220, and Stress Constants is-601MPa/ degree.
Comparison diagram 1 and Fig. 3 respectively, Fig. 2 and Fig. 4, therefrom can find out, in the scope of error, the analog result of the detection method of hot shears cutter material laser-impact unrelieved stress hot wire-CVD of the present invention and experimental result is utilized to have good consistance, show this detection method reliability and accuracy better, thus unrelieved stress hot wire-CVD degree can be detected efficiently, easily, for the application of laser impact intensified treatment technology on shearing tool is offered reference and reference.
Described embodiment is preferred embodiment of the present invention; but the present invention is not limited to above-mentioned embodiment; when not deviating from flesh and blood of the present invention, any apparent improvement that those skilled in the art can make, replacement or modification all belong to protection scope of the present invention.
Claims (9)
1. a detection method for hot shears cutter material laser-impact unrelieved stress hot wire-CVD, is characterized in that, comprise the steps:
(1) finite element model of hot shears cutter material is set up:
Hot shears cutter material is cut to rectangle fritter, measure length and width and the height of rectangle fritter, in simulation softward ANSYS/LS_DYNA centered by Y-axis axis of symmetry, X-Z plane is the geometric model that laser-impact plane creates rectangle fritter, through Unit selection, stress and strain model, selects constitutive model and after applying boundary condition, obtains the finite element model of hot shears cutter material;
(2) finite element model simulated laser is impacted:
Setting laser parameter, hot spot impacts track and carries out simulated laser impact according to " S " type to finite element model, finite element model after must impacting;
(3) the unrelieved stress hot wire-CVD of finite element model is detected;
Measure surface residual stress and the degree of depth unrelieved stress of finite element model after impacting; Subsequently, under identical temperature retention time, change the temperature loading of finite element model, measure surface residual stress and the degree of depth unrelieved stress of this finite element model under different temperatures load, draw the unrelieved stress hot wire-CVD under different temperatures load thus.
2. the detection method of a kind of hot shears cutter material laser-impact unrelieved stress hot wire-CVD according to claim 1, it is characterized in that, described in step (1), the material of hot shears cutter to be measured is 6CrW2Si steel.
3. the detection method of a kind of hot shears cutter material laser-impact unrelieved stress hot wire-CVD according to claim 1, it is characterized in that, described in step (1), the length of rectangle fritter is 10cm, and wide is 10cm, and height is 5cm.
4. the detection method of a kind of hot shears cutter material laser-impact unrelieved stress hot wire-CVD according to claim 2, it is characterized in that, Unit selection described in step (1) is 8 node hexahedral element SOLID164; Described stress and strain model process is that spot radius 2 times of length areas carry out mesh refinement on three axes, and all the other adopt sparse grid; Described material constitutive model selects JC model; Described applying boundary condition is for applying symmetry constraint.
5. the detection method of a kind of hot shears cutter material laser-impact unrelieved stress hot wire-CVD according to claim 2, it is characterized in that, described in step (2), laser parameter is as follows: laser energy is 8J, and laser power density is 11.3GW/cm
2, the output wavelength of laser is 10.6um, and laser blast wave load pressure is 3.3GPa.
6. the detection method of a kind of hot shears cutter material laser-impact unrelieved stress hot wire-CVD according to claim 2, it is characterized in that, the detection path of surface residual stress described in step (3) is that described laser-impact hot spot surveys a point, to 5mm place every 0.5mm in the X-axis direction; It is that described laser-impact hot spot surveys a point, to 0.7mm every 0.05mm in the Y-axis direction that described degree of depth unrelieved stress detects path.
7. the detection method of a kind of hot shears cutter material laser-impact unrelieved stress hot wire-CVD according to claim 6, it is characterized in that, described laser-impact hot spot is circular light spot, and radius is 1.5mm.
8. the detection method of a kind of hot shears cutter material laser-impact unrelieved stress hot wire-CVD according to claim 2, it is characterized in that, different temperatures load described in step (3) is 300 DEG C, 400 DEG C, 500 DEG C, 600 DEG C.
9. the detection method of a kind of hot shears cutter material laser-impact unrelieved stress hot wire-CVD according to claim 2, it is characterized in that, described in step (3), temperature retention time is 10min.
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| CN107229767A (en) * | 2017-04-06 | 2017-10-03 | 广东工业大学 | A kind of computational methods of the laser impact intensified surface roughness based on numerical computations |
| CN107576440A (en) * | 2017-09-21 | 2018-01-12 | 北京工业大学 | The measuring method that a kind of residual stress influences on tangential double bolt fastening structure relaxations |
| CN108531714A (en) * | 2018-07-04 | 2018-09-14 | 北京航空航天大学 | A kind of multi-Precision optimization method that mortise structure is laser impact intensified |
| CN114861491A (en) * | 2022-04-21 | 2022-08-05 | 华南师范大学 | Numerical simulation method for multi-point large-inclination-angle oblique laser shock peening with various light intensity distributions |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106769596A (en) * | 2016-12-30 | 2017-05-31 | 中钢集团邢台机械轧辊有限公司 | A kind of roll laser thermal shock test method |
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| CN107229767A (en) * | 2017-04-06 | 2017-10-03 | 广东工业大学 | A kind of computational methods of the laser impact intensified surface roughness based on numerical computations |
| CN107229767B (en) * | 2017-04-06 | 2021-01-19 | 广东工业大学 | Numerical calculation-based laser shock peening surface roughness calculation method |
| CN107576440A (en) * | 2017-09-21 | 2018-01-12 | 北京工业大学 | The measuring method that a kind of residual stress influences on tangential double bolt fastening structure relaxations |
| CN107576440B (en) * | 2017-09-21 | 2019-11-15 | 北京工业大学 | A kind of measurement method that residual stress influences tangential double bolt fastening structure relaxations |
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| CN108531714B (en) * | 2018-07-04 | 2019-05-10 | 北京航空航天大学 | A kind of multi-Precision optimization method that mortise structure is laser impact intensified |
| CN114861491A (en) * | 2022-04-21 | 2022-08-05 | 华南师范大学 | Numerical simulation method for multi-point large-inclination-angle oblique laser shock peening with various light intensity distributions |
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