CN112359202B - Temperature-controlled laser shock peening device and temperature control method - Google Patents
Temperature-controlled laser shock peening device and temperature control method Download PDFInfo
- Publication number
- CN112359202B CN112359202B CN202011202228.0A CN202011202228A CN112359202B CN 112359202 B CN112359202 B CN 112359202B CN 202011202228 A CN202011202228 A CN 202011202228A CN 112359202 B CN112359202 B CN 112359202B
- Authority
- CN
- China
- Prior art keywords
- temperature
- heating
- oil
- sample
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
- C21D10/005—Modifying the physical properties by methods other than heat treatment or deformation by laser shock processing
-
- 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
- C21D11/00—Process control or regulation for heat treatments
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Optics & Photonics (AREA)
- Laser Beam Processing (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to the field of laser shock peening, in particular to a temperature control laser shock peening device and a temperature control method. The method comprises the following steps: the system comprises a laser, a heating platform, a track robot, an oil pump system and a PC (personal computer); the heating platform is arranged on a mechanical arm of the track robot through a flange plate and used for heating and controlling the temperature of a processed sample and monitoring the oxygen concentration in the heating platform in real time; the oil pump system is connected with the heating platform through an oil discharge pipeline to form a circulation loop for providing oil liquid for the surface of the processed sample; the laser is used for emitting laser to the processed sample and strengthening the surface of the processed sample; the PC is connected with the heating platform and used for setting process parameters, receiving the temperature and the oxygen concentration detected by the heating platform in real time and controlling the heating platform to a set temperature; and arranging the processing sample in the heating platform, wherein the constraint layer is opposite to the laser. The invention improves the high-temperature stability of laser shock peening, improves the mechanical property of the surface of a sample, and realizes temperature control laser shock peening.
Description
Technical Field
The invention relates to the field of laser shock peening, in particular to a temperature control laser shock peening device and a temperature control method.
Background
At present, the laser shock peening technology is successfully applied to the surface processing process of the cold-end blade of the aircraft engine, so that the service life of the engine at the cold end is prolonged by more than 3 times, but researches find that the residual compressive stress formed after laser shock peening is insulated at high temperature (more than 200 ℃), the residual stress is partially released, and if the insulation time is longer or the temperature is higher, the residual stress almost completely disappears. The temperature control laser shock peening can effectively inhibit the high-temperature instability of the peening effect and effectively improve the high-temperature stability of the residual pressure stress layer on the surface of the material.
The temperature control laser shock peening integrates laser shock peening, dynamic strain aging and dynamic precipitation into a whole thermal coupling process, and the fatigue resistance of the material is obviously improved. Due to the thermal coupling effect, the temperature laser shock peening improves the size and stability of residual stress and surface hardness simultaneously, and has great application potential in the aspect of material surface strengthening. However, the process difficulty which is difficult to break through in the aspect of controlling and strengthening the surface temperature of the sample is still remained, and because the absorption layer and the constraint layer are attached to the surface of the sample, the accurate temperature of the surface of the sample is difficult to directly measure, so that the accurate temperature control is the difficulty of the temperature control laser shock strengthening process.
Disclosure of Invention
The invention mainly aims to solve the problem of poor temperature controllability of temperature control laser shock peening, and aims to provide a temperature control laser shock peening device and a corresponding method thereof.
The technical scheme adopted by the invention for realizing the purpose is as follows: a temperature controlled laser shock peening apparatus comprising: the system comprises a laser, a heating platform, a track robot, an oil pump system and a PC (personal computer);
the heating platform is arranged on a mechanical arm of the track robot through a flange plate and used for heating and controlling the temperature of a processed sample and monitoring the oxygen concentration in the heating platform in real time;
the oil pump system is connected with the heating platform through an oil discharge pipeline, forms a circulation loop and is used for providing oil liquid for the surface of a processed sample;
the laser is used for emitting laser to the processed sample and strengthening the surface of the processed sample;
the PC is connected with the heating platform and used for setting process parameters, receiving the temperature and the oxygen concentration detected by the heating platform in real time and controlling the heating platform to a set temperature;
the processing sample is arranged in the heating platform and sequentially comprises a restraint layer and an absorption layer from the surface to the inner layer, and the restraint layer is opposite to the laser.
The heating stage includes: the device comprises a heating device, an argon bottle, an air outlet, an air inlet, an oil outlet, a nozzle, an oxygen sensor, a clamp, a protective cover and a window mirror;
the heating device and the protective cover form a closed box body, a clamp is arranged on the heating device in the closed box body, the clamp is clamped on a processing sample, and a window mirror is arranged on the protective cover; the window mirror is arranged opposite to the constraint layer;
the oxygen sensor is arranged in the protective cover, is arranged on the inner wall of the top of the protective cover and is used for monitoring the oxygen concentration in the protective cover in real time and feeding the oxygen concentration back to the PC;
the protective cover is provided with an air outlet and an air inlet, the air outlet is emptied through an air outlet pipe, and the air inlet is connected with an argon bottle through an air inlet pipe;
the nozzle is arranged above the processing sample, is connected with the oil pump system through an oil discharge pipeline and is used for providing a constrained layer oil liquid on the surface of the processing sample;
the oil discharge port is connected with the oil pump system through an oil pipe, so that oil sprayed out of the nozzle is recycled to the oil pump system for reuse.
The oil pump system includes: the oil pump, the silicone oil collecting box and the oil liquid heating device;
the silicone oil collecting box is of a cover-free cylinder structure, an oil discharging pipeline is arranged at the bottom of the silicone oil collecting box, a wire mesh is arranged in the middle of the silicone oil collecting box, the filter cotton is placed on the wire mesh, oil enters the silicone oil collecting box through an oil discharging hole of the protective cover and flows into the oil discharging pipeline through the filter cotton, the oil pump pumps the filtered oil to the input end of the oil pump, and the output end of the oil pump is connected with the nozzle through the oil discharging pipeline so as to recycle the oil;
and the bottom surface of the silicone oil collecting box is provided with an oil liquid heating device for heating oil liquid.
Heating device or fluid heating device all include: a thermocouple and a plurality of heating rods;
the heating rods are laid at the bottom of the silicone oil collecting box or on one side of the processed sample at equal intervals, so that the processed sample or the oil liquid is heated uniformly;
and the thermocouple is used for monitoring the temperature of the heating device or the oil heating device in real time and feeding back temperature information to the PC to realize real-time temperature adjustment.
And the constraint layer of the processed sample is temperature-resistant silicone oil which flows to the surface of the processed sample through a nozzle.
The track robot and the flange plate form six-axis linkage and can move along an X axis or a Y axis; the silicon oil collecting box is connected with the protective cover, the bottom of the silicon oil collecting box is arranged on the guide rail, and the protective cover drives the silicon oil collecting box and the heating platform to move synchronously.
The process parameters include the heating platen temperature, the confinement layer temperature, and the confinement layer flow rate.
A temperature control method of a temperature control laser shock peening device comprises the following steps:
1) preprocessing a processed sample;
2) setting technological parameters to obtain the set temperatures of the constraint layer and the heating platform: establishing a physical model through numerical simulation software according to set process parameters, obtaining the relationship between the surface temperature of the processing sample and the set temperature of the heating platform and the temperature of the constraint layer according to the temperature field distribution of the processing sample in the physical model, and obtaining the set temperatures of the constraint layer and the heating platform when the surface temperature of the processing sample reaches the set temperature;
3) experimental work: preheating by a laser, opening an argon bottle to introduce argon into the protective cover, setting the temperature of a heating rod and starting heating, starting detection by an oxygen concentration sensor, and heating by the heating rod at the bottom of a silicone oil collecting box; when the temperature measured by the thermocouple reaches a set temperature and is kept unchanged, and the oxygen concentration is lower than a threshold value, laser shock peening is started;
4) and (3) post-treatment of a processed sample: and removing the restraint layer and the absorption layer on the surface of the processed sample, cleaning with alcohol, drying and finishing the experiment.
The step 1) is used for preprocessing a processed sample, and specifically comprises the following steps:
carrying out surface mechanical grinding and polishing on the processed sample to enable the surface roughness to be lower than 0.2Ra, adding the polished processed sample into alcohol with the concentration of more than 75%, and carrying out ultrasonic cleaning and drying; the polished side of the processed sample was covered with an aluminum foil as an absorbent layer.
The invention has the following beneficial effects and advantages:
1. the invention can effectively improve the high-temperature stability of laser shock peening, improve the mechanical property of the surface of a sample and realize temperature control laser shock peening.
2. The invention can monitor the oxygen content and the heating temperature in the protective cover in real time, prevent the sample from being oxidized in a high-temperature environment, and simultaneously can accurately control the temperature of the surface of the sample.
3. The device has simple structure and low cost.
Drawings
FIG. 1 is a diagram of a numerical calculation simulation process of the present invention;
FIG. 2 is a schematic diagram of the apparatus of the present invention;
the device comprises a gas outlet, a nozzle, a thermocouple, a heating rod, a flange plate, an oil pipe, filter cotton, a track robot, a silicon oil collecting box, a clamp, a processing sample, an absorption layer, a constraint layer, a protective cover, an oxygen sensor, a window mirror, an air inlet, an argon gas cylinder, a laser and an oil pump, wherein the gas outlet is 1, the nozzle is 2, the thermocouple is 3, the heating rod is 4, the flange plate is 5, the oil pipe is 6, the filter cotton is 7, the track robot is 8, the silicon oil collecting box is 9, the clamp is 10, the processing sample is 11, the absorption layer is 12, the constraint layer is 13, the protective cover is 14, the oxygen sensor is 15, the window mirror is 16, the air inlet is 17, the argon gas cylinder is 18, the laser is 19, and the oil pump is 20;
FIG. 3 is a graph showing the relationship between the temperature at the center of the surface of the absorbing layer and the temperature of the temperature-controlled surface.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, which is a numerical calculation simulation process diagram of the present invention, when the surface temperature of the sample is predicted by a numerical simulation method, the plane of the heating platform adjacent to the temperature control system is set as a constant temperature plane, and the heating platform, the sample, and the absorption layer are simplified into a cube. Firstly, when no restraint layer exists, under the action of a constant-temperature heating surface, the temperature distribution of a heating platform, a sample and an absorption layer is calculated and combined with an experimentAnd (5) verifying the fruits. And then adding the silicon oil of the restraint layer, calculating the temperature distribution of each part under the action of the constant-temperature heating plane, and focusing on the temperature distribution of the sample. The simulation procedure is shown in FIG. 1, with a heating stage size of 50X 4mm, a sample size of 40X 4mm, an absorber layer size of 40X 0.2mm, a confinement layer calculation area of 40X 4mm, silicone oil flowing out through a pipe, an inlet diameter of 4mm, and a pipe length of 4 mm. The silicon oil naturally flows out in the space calculation domain, and for the solid material, except for the constant-temperature heating surface and the contact surface, other surfaces exposed in the air and the air generate natural convection, and structural grid division is carried out on the model. According to a physical model, 316 stainless steel is selected as a material of the heating platform, GH4169 is selected as a sample, the constraint layer is transparent silicone oil, and the absorption layer is aluminum foil. Assuming that the center of the laser spot coincides with the center of the sample proximate the surface of the absorbing layer, the temperature at the center is chosen as the average temperature at the spot since the laser spot is about 2mm in diameter. The temperature is used as variable and ranges from 200 ℃ to 600 ℃, and the temperature (T) of the target material close to the surface center position of the absorption layer is obtainedB) And a temperature control surface (T)H) The temperature of (c) is shown in the following graph. From the figure, T can be seenBAnd THThe relationship therebetween is satisfied.
As shown in fig. 2, which is a schematic structural diagram of the present invention, the present invention discloses a temperature-controlled laser shock peening apparatus and an accurate temperature control method, the temperature-controlled laser shock peening apparatus includes: the laser instrument, the window mirror, the safety cover, argon gas income gas port and gas outlet, heating rod, anchor clamps, the thermocouple, the heat insulation layer, the ring flange, oxygen sensor, silicon oil collecting box etc. go into the gas port and the air duct and the safety cover of gas outlet and pass through the screw thread fastening at the flange dish edge to with the isolated air of silica gel pad, utilize argon gas as protective gas. The heating rod is inserted into the bottoms of the sample fixture and the silicone oil collecting box and can be freely taken out and adjusted in position. The filter pulp is fixed in the middle of the collecting box through a wire netting and a screw, the collecting box is connected with the protective cover through a guide rail and can be taken out, and the flange plate is connected with the mechanical arm to realize six-axis linkage.
Temperature control laser shock peening process: mechanically grinding and polishing the surface of a metal sample (the surface roughness is not more than 0.2Ra), and then putting the metal sample into alcohol with the concentration of more than 75 percent for ultrasonic cleaning and drying; then covering a layer of aluminum foil on the polished surface as an absorption layer, fixing the polished surface on a special high-temperature laser shock fixture, and applying a layer of restraint layer (high-temperature-resistant silicon oil) on the surface of the polished surface to prevent shock waves from diffusing outwards and enhance the action effect of laser plasma shock waves; after the sample is mounted and clamped, the protective cover is fixed on the flange plate, the air guide pipes of the air inlet and the air outlet are communicated, the protective cover is screwed to prevent air leakage, and then argon is introduced. And simultaneously, starting a heating device, starting heating by an electric heating rod in the fixture, adjusting the heating temperature within the range of 20-300 ℃, and starting a laser for strengthening after the temperature is stabilized for 1min and the oxygen concentration measured by the oxygen sensor is reduced to 5 vol%. The technological parameter range adopted by the laser for strengthening treatment is as follows: the wavelength is 1064nm, the pulse width is 5-20ns, the laser energy is 0.5-10J, the repetition frequency is 0.5-2Hz, the diameter of the formed light spot is about 0.5-3mm, and the overlapping rate of the light spot is about 50%. And after treatment, removing the surface absorption layer, cleaning with alcohol and blow-drying for later use. Finally, room temperature laser shock peening was performed under the same conditions as a comparative test.
The high-temperature impact strengthening temperature control system consists of four groups of electric heating rods, the temperature control range is 25-300 ℃, the temperature precision is 0.1 ℃, the heating rate is 100 ℃/min, the temperature control feedback adjusting system is used for controlling the temperature to be accurately positioned, the thermocouple is used for measuring the temperature, the measured temperature is fed back to the temperature control adjusting device, and the real-time temperature adjustment is realized.
The system comprises a circulating system of a constraint layer collecting device, heating rods and filter cotton, used silicone oil flows into a constraint layer collecting box, is filtered and cleaned by the filter cotton and then flows into the bottom of the collecting box, a bottom layer heating system of the collecting box consists of five groups of heating rods, the temperature control range is 25-100 ℃, the temperature precision is 0.1 ℃, the heating rate is 10 ℃/min, a temperature control feedback adjusting system is used for controlling the accurate positioning of the temperature, a thermocouple is used for measuring the temperature, the test temperature is fed back to a temperature control adjusting device, and the real-time temperature adjustment is realized. The silicone oil is recycled through an oil pump.
The strengthening process is as follows:
(1) high-temperature strengthening sample pretreatment: mechanically grinding and polishing the surface (the surface roughness is lower than 0.2Ra), and then putting the polished surface into alcohol with the concentration of more than 75 percent for ultrasonic cleaning and drying. And then covering a layer of aluminum foil on the polished surface as an absorption layer, fixing the aluminum foil on a special high-temperature laser shock fixture, and applying a layer of restraint layer on the surface of the aluminum foil to prevent shock waves from diffusing outwards and enhance the action effect of laser plasma shock waves.
(2) Preparing high-temperature laser shock: after the sample is mounted and clamped, the protective cover is fixed on the flange plate, the air guide pipes of the air inlet and the air outlet are communicated, the protective cover is screwed to prevent air leakage, and then argon is introduced. The fixture electric heating rod starts to heat, the heating temperature range is 25-300 ℃ and can be adjusted, after the temperature to be measured is stabilized for 1min, the oxygen concentration measured by the oxygen sensor is reduced to be below 5 VOL%, and the strengthening is started.
(3) Laser shock peening: adjusting laser shock peening process parameters, wherein the laser parameter range is as follows: the wavelength is 1064nm, the pulse width is 5-20ns, the laser energy is 0.5-10J, the repetition frequency is 0.5-2Hz, and the diameter of the formed light spot is about 0.5-3 mm. The track robot is used for clamping the sample to complete the track realization of the processing process, and the overlapping rate of the light spots in the X, Y direction reaches about 50%.
(4) And (3) post-treatment of the high-temperature reinforced sample: and after treatment, removing the surface restraint layer and the absorption layer, cleaning with alcohol and drying for later use. Finally, room temperature laser shock peening was performed under the same conditions as a comparative test.
Material and thickness of the absorbing layer:
the absorption layer covered on the surface of the sample is an aluminum foil, the aluminum foil with the thickness range of 20-50 mu m is used as the absorption layer, the laser is induced to generate plasma shock waves, and the aluminum foil is easy to ablate or damage in the shock process when being too thin, so that the surface quality of the sample is influenced; if the aluminum foil is too thick, laser energy can be attenuated, the pressure of plasma shock waves is reduced, the effect of laser shock strengthening is affected, and no bubbles or impurities exist between the aluminum foil and a sample.
The constraint layer requires:
the restraint layer is high-temperature-resistant silicone oil, the heat-resistant temperature is more than 350 ℃, the safe working temperature is 300 ℃, and the light-transmitting property is good.
Example 1:
as shown in fig. 1 to 3, which are numerical calculation simulation process diagrams of the present invention, the preferred conditions for temperature-controlled laser shock peening of GH4169 alloy for high temperature stability maintenance are as follows:
obtaining a sample of 40mm multiplied by 4mm by linear cutting, polishing a single surface, carrying out ultrasonic cleaning in 75% alcohol for 10min after the surface roughness reaches Ra 0.2, and drying;
pasting a layer of aluminum foil with the thickness range of 30 mu m on the polished surface of a sample to be detected as an absorption layer, inducing laser to generate plasma shock waves, and requiring that no bubbles or impurities exist between the aluminum foil and the sample;
on the outer side of the aluminum foil, the flowing silicone oil forms a smooth oil curtain, and the safe working temperature of the oil curtain is 300 ℃;
the temperature of the high-temperature impact strengthening fixture is adjusted to 200 ℃, and the temperature change range is not more than +/-1 ℃ after the high-temperature impact strengthening fixture is stabilized for 1 min.
The laser shock peening process parameters are adjusted as follows: the wavelength is 1064nm, the pulse width is 14ns and can be adjusted, the laser energy is 7J and the repetition frequency is 2Hz, and the diameter of the formed light spot is about 2 mm. A track robot is used for clamping a sample to complete the track realization of the processing process, a square with the processing area of 20mm multiplied by 20mm is processed, the overlapping rate of light spots in the direction of X, Y reaches about 45%, and the impact is carried out twice.
In order to compare the effects of temperature-controlled laser shock peening, the invention also compares the microhardness and the residual stress of the strengthened sample according to the same process parameters, and the test results are shown in the following table:
TABLE 1
The microhardness of the GH4169 alloy subjected to high-temperature impact is not obviously improved compared with that of the GH4169 alloy subjected to normal-temperature impact, and the fluctuation range of the residual stress test result is larger.
Carrying out high-temperature aging on the sample subjected to high-temperature impact strengthening, and then carrying out air cooling, wherein the high-temperature aging is divided into the following 6 groups:
TABLE 2
| Group of | Temperature/. degree.C | Time/h |
| 1 | 400 | 2 |
| 2 | 500 | 2 |
| 3 | 600 | 2 |
| 4 | 400 | 6 |
| 5 | 500 | 6 |
| 6 | 600 | 6 |
For the samples of high-temperature laser shock strengthening and normal-temperature laser shock strengthening at 200 ℃, the six groups of aging results are subjected to microhardness and residual stress tests, and the test results are shown in table 3:
results of microhardness testing:
TABLE 3
Test results of residual stress:
TABLE 4
After normal temperature and high temperature laser shock strengthening, the difference between the microhardness and the residual stress of GH4169 is small, which shows that the temperature has little influence on the strengthening effect. The microhardness and residual stress of normal temperature impact after aging are greatly and obviously attenuated; and after the high-temperature impact, the sample is aged, the microhardness and the residual stress attenuation degree of the sample are obviously lower than those of the sample subjected to normal-temperature impact, and the high-temperature impact strengthening can improve the mechanical property and the stability of the tissue structure of the material.
Claims (5)
1. A temperature control method of a temperature control laser shock peening device is characterized in that the temperature control laser shock peening device comprises the following steps: the system comprises a laser (19), a heating platform, a track robot (8), an oil pump system and a PC (personal computer);
the heating platform is arranged on a mechanical arm of the track robot (8) through a flange plate (5) and is used for heating and controlling the temperature of a processed sample (11) and monitoring the oxygen concentration in the heating platform in real time;
the oil pump system is connected with the heating platform through an oil discharge pipeline, forms a circulation loop and is used for providing oil liquid for the surface of the processing sample (11);
the laser (19) is used for emitting laser to the processing sample (11) and strengthening the surface of the processing sample (11);
the PC is connected with the heating platform and used for setting process parameters, receiving the temperature and the oxygen concentration detected by the heating platform in real time and controlling the heating platform to a set temperature;
arranging a processing sample (11) in a heating platform, wherein the processing sample (11) sequentially comprises a constraint layer (13) and an absorption layer (12) from the surface to the inner layer, and the constraint layer (13) is arranged opposite to a laser (19);
the heating stage includes: the device comprises a heating device, an argon bottle (18), an air outlet (1), an air inlet (17), an oil outlet, a nozzle (2), an oxygen sensor (15), a clamp (10), a protective cover (14) and a window mirror (16);
the heating device and the protective cover (14) form a closed box body, a clamp (10) is arranged on the heating device in the closed box body, the clamp (10) is clamped on a processing sample (11), and a window mirror (16) is arranged on the protective cover (14); the window mirror (16) is arranged opposite to the constraint layer (13);
the oxygen sensor (15) is arranged in the protective cover (14), is arranged on the inner wall of the top of the protective cover (14), and is used for monitoring the oxygen concentration in the protective cover (14) in real time and feeding back the oxygen concentration to the PC;
the protective cover (14) is provided with an air outlet (1) and an air inlet (17), the air outlet (1) is emptied through an air outlet pipe, and the air inlet (17) is connected with an argon bottle (18) through an air inlet pipe;
the nozzle (2) is arranged above the processing sample (11), is connected with the oil pump (20) system through an oil discharge pipeline and is used for providing oil liquid of a restraint layer (13) on the surface of the processing sample (11);
the oil discharge port is connected with an oil pump (20) system through an oil pipe (6), so that oil sprayed by the nozzle (2) is recycled to the oil pump system for reuse;
the oil pump system includes: the oil pump (20), the silicone oil collecting box (9) and the oil liquid heating device;
the silicone oil collecting box (9) is of a cover-free cylinder structure, an oil discharging pipeline is arranged at the bottom of the silicone oil collecting box, a wire mesh is arranged in the middle of the silicone oil collecting box (9), filter cotton (7) is placed on the wire mesh, oil enters the silicone oil collecting box (9) through an oil discharging hole of a protective cover (14) and flows into the oil discharging pipeline through the filter cotton (7), the oil pump (20) pumps the filtered oil to the input end of the oil pump (20), and the output end of the oil pump (20) is connected with the nozzle (2) through the oil discharging pipeline, so that the oil is recycled;
an oil liquid heating device is arranged on the bottom surface of the silicone oil collecting box (9) and used for heating oil liquid;
heating device or fluid heating device all include: a thermocouple (3) and a plurality of heating rods (4);
the heating rods (4) are paved at the bottom of the silicone oil collecting box (9) or one side of the processed sample (11) at equal intervals, so that the processed sample or the oil liquid is heated uniformly;
the thermocouple (3) is used for monitoring the temperature of the heating device or the oil heating device in real time and feeding back temperature information to the PC to realize real-time temperature adjustment;
a temperature control method of a temperature control laser shock peening device comprises the following steps:
1) preprocessing a processed sample;
2) setting process parameters to obtain the set temperatures of the constraint layer (13) and the heating platform: establishing a physical model through numerical simulation software according to set process parameters, obtaining the relationship between the surface temperature of the processing sample (11), the set temperature of the heating platform and the temperature of the constraint layer according to the temperature field distribution of the processing sample (11) in the physical model, and obtaining the set temperatures of the constraint layer (13) and the heating platform when the surface temperature of the processing sample (11) reaches the set temperature;
the numerical simulation method comprises the following steps: when the surface temperature of the sample is predicted by a numerical simulation method, the plane of the heating platform close to the temperature control system is set as a constant temperature plane, and the heating platform, the sample and the absorption layer (12) are simplified into a cube;
firstly, when no restraint layer exists, under the action of a constant-temperature heating surface, calculating the temperature distribution of a heating platform, a sample and an absorption layer, and verifying the temperature distribution with an experimental result; then adding the silicon oil of the restraint layer (13), calculating the temperature distribution of each part under the action of a constant-temperature heating plane, and paying attention to the temperature distribution of the sample;
the simulation process specifically comprises the following steps: selecting the size of the heating platform as follows: 50mm by 4mm, sample size: 40mm x 4mm, the dimensions of the absorbent layer (12) being: 40mm x 0.2mm, the calculated area of the constraining layer (13) is: 40 multiplied by 4mm, the silicone oil flows out through a pipeline, the diameter of an inlet is 4mm, and the length of the pipeline is 4 mm;
the silicone oil flows out in the space calculation domain, and for the solid material, except for a constant-temperature heating surface and a contact surface, the surfaces exposed in the air generate convection with the air so as to realize structural grid division on the physical model;
according to a physical model, the heating platform is made of 316 stainless steel, a sample is GH4169, the constraint layer (13) is made of transparent silicone oil, and the absorption layer (12) is made of aluminum foil; supposing that the center of the laser spot coincides with the center of the surface of the sample close to the absorption layer (13), and the diameter of the laser spot is about 2mm, the temperature of the center position is selected as the average temperature of the spot;
the temperature is used as variable and ranges from 200 ℃ to 600 ℃, and the temperature (T) of the target material close to the surface center position of the absorption layer is obtainedB) And a temperature control surface (T)H) Is obtained by obtaining TBAnd THThe relationship between them is:
3) experimental work: the laser (19) is used for preheating, an argon bottle (18) is opened to introduce argon into the protective cover (14), the temperature of the heating rod (4) is set and heating is started, the oxygen concentration sensor (15) starts to detect, and the heating rod (4) at the bottom of the silicon oil collecting box (9) is heated; when the temperature measured by the thermocouple (3) reaches the set temperature and keeps unchanged and the oxygen concentration is lower than the threshold value, laser shock peening is started;
4) and (3) post-treatment of a processed sample: and (3) removing the restraint layer (13) and the absorption layer (12) on the surface of the processed sample (11), cleaning with alcohol, drying and finishing the experiment.
2. The temperature control method of the temperature-controlled laser shock peening apparatus according to claim 1, wherein the step 1) is to pre-treat the processing sample (11), specifically:
carrying out surface mechanical grinding and polishing on the processed sample (11) to enable the surface roughness to be lower than 0.2Ra, adding the polished processed sample into alcohol with the concentration of more than 75%, and carrying out ultrasonic cleaning and drying; an aluminum foil is coated on the polished surface of the processed sample (11) as an absorption layer (12).
3. The temperature control method of the temperature control laser shock peening apparatus according to claim 1, wherein the constraining layer (13) of the processing sample (11) is temperature-resistant silicone oil flowing to the surface of the processing sample (11) through the nozzle (2).
4. The temperature control method of the temperature control laser shock peening device according to claim 1, wherein the track robot (8) and the flange (5) form six-axis linkage and can move along an X axis or a Y axis; the silicon oil collecting box (9) is connected with the protective cover (14), the bottom of the silicon oil collecting box (9) is arranged on the guide rail, and the protective cover (14) drives the silicon oil collecting box (9) and the heating platform to move synchronously.
5. The method of claim 1, wherein the process parameters include a platen temperature, a confinement layer temperature, and a confinement layer flow rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011202228.0A CN112359202B (en) | 2020-11-02 | 2020-11-02 | Temperature-controlled laser shock peening device and temperature control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011202228.0A CN112359202B (en) | 2020-11-02 | 2020-11-02 | Temperature-controlled laser shock peening device and temperature control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112359202A CN112359202A (en) | 2021-02-12 |
| CN112359202B true CN112359202B (en) | 2022-02-01 |
Family
ID=74514227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011202228.0A Active CN112359202B (en) | 2020-11-02 | 2020-11-02 | Temperature-controlled laser shock peening device and temperature control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112359202B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA3116745A1 (en) * | 2021-04-30 | 2022-10-30 | Safran | System and method for cold working a metal surface |
| CN114686675A (en) * | 2022-03-31 | 2022-07-01 | 江苏大学 | Device for real-time coupling and strengthening of electric pulse and laser shock wave |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191497B (en) * | 2011-04-26 | 2013-01-23 | 江苏大学 | Method and device for preparing nanometer carbon-based film on surface of alloy substrate |
| CN103111751B (en) * | 2012-12-31 | 2015-12-02 | 江苏大学 | A kind of method of pulse laser bump warm working and device |
| CN103540715B (en) * | 2013-10-31 | 2015-03-25 | 江苏大学 | Constant-speed continuous silicone oil restraining device and method |
| CN104195295B (en) * | 2014-09-24 | 2016-05-25 | 江苏大学 | Laser temperature pill spraying surface reinforcing method and device that heat affected area is controlled |
| CN108085479A (en) * | 2016-11-22 | 2018-05-29 | 中国科学院沈阳自动化研究所 | A kind of temperature-controlled laser shock peening high temperature stability maintenance method and apparatus |
| CN110578047A (en) * | 2018-06-07 | 2019-12-17 | 中国科学院沈阳自动化研究所 | high-temperature laser shock strengthening device and method |
| CN109454334A (en) * | 2018-10-24 | 2019-03-12 | 西安交通大学 | A kind of medium-temperature reinforced system and method for laser-impact |
-
2020
- 2020-11-02 CN CN202011202228.0A patent/CN112359202B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112359202A (en) | 2021-02-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112359202B (en) | Temperature-controlled laser shock peening device and temperature control method | |
| CN109147970B (en) | Fuel cladding LOCA simulation test device | |
| Wu et al. | Acoustic wave detection of laser shock peening | |
| CN108665442A (en) | The thermal image defect characteristic of Infrared Non-destructive Testing enhances processing method | |
| Zhang et al. | Relationship between weld quality and optical emissions in underwater Nd: YAG laser welding | |
| CN112525739A (en) | High-temperature random fatigue test device and method | |
| CN108085479A (en) | A kind of temperature-controlled laser shock peening high temperature stability maintenance method and apparatus | |
| CN206440644U (en) | A kind of atmosphere laser heating thermal shock/fatigue experimental device in situ | |
| Kumar et al. | Characteristics of fiber laser weldments of two phases (α+ β) titanium alloy | |
| CN110904404A (en) | Process method and device based on titanium alloy surface laser nitriding and shot blasting synchronous compounding technology | |
| Pan et al. | Experimental and numerical study of crack damage under variable amplitude thermal fatigue for compacted graphite iron EN-GJV-450 | |
| CN111060408B (en) | Strain-controlled thermo-mechanical fatigue performance testing method | |
| CN110578047A (en) | high-temperature laser shock strengthening device and method | |
| Hurrell et al. | Review of residual stress mitigation methods for application in nuclear power plant | |
| CN215288879U (en) | Quartz lamp and laser combined type complex curved surface heating device | |
| McWilliams et al. | Design of a high temperature process chamber for the selective laser sintering process | |
| CN211718023U (en) | Non-contact thermal shock high-temperature mechanical testing device | |
| CN105182123A (en) | Converter valve saturable reactor thermal property test apparatus and test method thereof | |
| CN215295532U (en) | High-temperature heating device of active cooling prism refraction type quartz lamp | |
| CN211311566U (en) | Device based on titanium alloy surface laser nitriding and shot blasting synchronous compounding technology | |
| US20040035835A1 (en) | Noble metal in-situ sampling method and apparatus | |
| CN112595740A (en) | Independent multi-point quartz lamp heat checking device based on focusing heating | |
| Wang et al. | Laser infrared thermography detection for aviation carbon fibre composites | |
| Sysoev | Laser etching and polishing of quartz tubes | |
| Senturk et al. | Deformation of plasma sprayed thermal barrier coatings |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |