CN110578047A - high-temperature laser shock strengthening device and method - Google Patents
high-temperature laser shock strengthening device and method Download PDFInfo
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- CN110578047A CN110578047A CN201810579051.2A CN201810579051A CN110578047A CN 110578047 A CN110578047 A CN 110578047A CN 201810579051 A CN201810579051 A CN 201810579051A CN 110578047 A CN110578047 A CN 110578047A
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- 230000035939 shock Effects 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005728 strengthening Methods 0.000 title abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 125
- 230000001681 protective effect Effects 0.000 claims abstract description 69
- 239000005304 optical glass Substances 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 239000003973 paint Substances 0.000 claims description 6
- 230000003064 anti-oxidating effect Effects 0.000 abstract description 15
- 230000003647 oxidation Effects 0.000 abstract description 8
- 238000007254 oxidation reaction Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000002474 experimental method Methods 0.000 abstract description 3
- 238000003754 machining Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 48
- 239000003921 oil Substances 0.000 description 46
- 239000010410 layer Substances 0.000 description 27
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 238000007789 sealing Methods 0.000 description 7
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- 229910045601 alloy Inorganic materials 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
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- 239000000523 sample Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
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- 238000005859 coupling reaction Methods 0.000 description 2
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- 239000012530 fluid Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
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Abstract
The invention relates to a high-temperature laser shock strengthening device and a method, wherein the high-temperature laser shock strengthening device comprises a laser, a motion platform, a heating platform, a temperature control device, a protective gas generating device, a constraint layer circulating device, a rapid clamping device and the like. The temperature control device adopts closed-loop control, can accurately control the temperature of the workpiece during laser shock peening, and adopts the protective gas generating device to ensure that the workpiece is filled with protective gas all the time around the machining process so as to avoid rapid oxidation of the workpiece in a high-temperature environment. The device has the advantages of simple structure, wide application range, convenient assembly and operation, low cost, controllable experiment temperature, gas anti-oxidation protection and capability of realizing better high-temperature laser shock strengthening experiment effect.
Description
Technical Field
The invention relates to the technical field of laser processing, in particular to a temperature-controllable and anti-oxidation high-temperature laser shock strengthening device and method.
Background
Laser shock peening is a surface strengthening technology born in the 70's of the last century, utilizes laser-induced plasma detonation waves to impact a target, and belongs to one of surface cold treatment processes. After the target material is subjected to laser shock strengthening treatment, a residual compressive stress field and a microstructure evolution grain refinement layer can be generated on the surface layer, and the fatigue resistance of the material can be improved. However, the microstructure formed by laser shock peening is a non-equilibrium structure and is in a thermodynamically metastable state. Residual compressive stress and microstructure generated by the test piece subjected to laser shock strengthening are very easy to relax and degrade in a high-temperature environment, and the surface performance of the strengthened material is remarkably reduced, so that the application of the technology in a high-temperature working environment is severely limited. In order to improve the high-temperature stability of the laser shock peening technology, researchers at the university of promiscuous usa proposed the concept of high-temperature laser shock peening in 2010. The high-temperature laser shock strengthening needs to heat a workpiece to a certain temperature and then carry out shock strengthening treatment on the workpiece, combines the dual advantages of laser shock strengthening and dynamic strain aging, can enable a surface microstructure to generate strain aging effect, generate high-density precipitates around compact dislocation and prick the precipitates, thereby improving the high-temperature stability of the material. The key index of the high-temperature laser shock peening technology is the surface temperature of a workpiece, and the expected effect can be achieved only by stabilizing the temperature of the workpiece at a set value, so that accurate control of the temperature of the workpiece is a premise for completing laboratory research and industrial application.
At present, a workpiece is heated by a heat conduction or induction coil, the temperature of the workpiece is measured by an infrared temperature measuring probe, and the temperature control is completed by a computer system. For example, patent No. CN104195295A proposes a method and apparatus for laser temperature peening surface strengthening with controllable heat affected zone, in which the heating, temperature measurement and control of the workpiece are completed by an induction coil, an infrared probe and a computer system. Although the method can control the surface temperature of the metal material and the depth of the heat affected zone, the method has large dependence on the shape and the size of the workpiece, and when the shape and the size of the workpiece are greatly changed, such as the shape and the size are changed from a plane to a complex curved surface, the device cannot accurately measure and control the temperature of the position of the surface of the workpiece with different heights. And the device has relatively complex structure, higher cost and poorer flexibility, which is unfavorable for the application and popularization of the device.
This patent is with heating rod embedding hot plate, accomplishes the heating of work piece through heat-conduction, through temperature sensor, and ac contactor and digital display controller accomplish the closed loop control of heating process. The device has simple and compact structure, low cost and wide application range.
At present, metals are often protected from oxidation by coating or spraying in high temperature environment, but these methods are not suitable for laser shock peening technology because: (1) when the workpiece is subjected to laser shock strengthening treatment, an absorption layer for absorbing laser energy needs to be covered on the surface of the workpiece, and the existence of an anti-oxidation film or an anti-oxidation coating can hinder the close adhesion of the absorption layer to influence the strengthening effect; (2) when the workpiece is subjected to laser shock strengthening treatment, a restraint layer for restraining plasma shock waves is required to be covered, water or silicon oil is usually adopted, and the restraint layer can possibly react with an anti-oxidation layer substance to peel off and cannot play an anti-oxidation effect; (3) plasma shock waves of GPa or even TPa magnitude can be generated in the laser shock strengthening process, and the anti-oxidation layer is easily damaged under the action of the shock waves, so that the anti-oxidation effect cannot be achieved.
By searching domestic and foreign documents, no device and method for enhancing the high-temperature laser shock with controllable temperature and oxidation resistance is found at present, and the invention provides the process method and the device for the first time.
Disclosure of Invention
The invention aims to solve the problems that the existing high-temperature laser shock strengthening equipment is complex in structure, high in cost and free of an anti-oxidation function, provides a temperature-controllable anti-oxidation high-temperature laser shock strengthening device and simultaneously provides a corresponding method.
The technical scheme adopted by the invention for solving the technical problems is as follows: a high temperature laser shock peening apparatus comprising: the device comprises a laser, a motion platform, a heating platform, a temperature control device and a protective gas generating device;
a temperature control device is arranged on the heating platform; the heating platform is connected with the moving platform through a protective gas generating device; the light outlet of the laser is opposite to the heating platform.
The heating platform comprises a heating rod and a heating plate; and the heating plate is provided with a heating rod and is fixed on the moving platform.
The heating rods are arranged in the heating plate.
A clamping device is arranged on the heating platform; the clamping device comprises a clamp, a workpiece supporting frame and a connecting plate; the workpiece supporting frame and the connecting plate are arranged on the heating plate in parallel, a workpiece is fixed on the workpiece supporting frame, and a clamp for fixing the workpiece is arranged on the connecting plate.
The temperature control device comprises a temperature sensor, a digital display controller and an alternating current contactor which are sequentially connected; the temperature sensor is arranged on the heating plate; the alternating current contactor is connected with the heating rod.
The protective gas generating device comprises a gas cylinder and a protective cover; a heating platform is arranged in the protective cover, and the outer part of the protective cover is connected with the moving platform; a gas cylinder is arranged outside the protective cover; the gas cylinder is communicated with the interior of the protective cover through a gas pipe.
a bottom plate of the protective cover is connected with the motion platform, and planar optical glass is arranged on one side opposite to the bottom plate; the laser emitted by the laser irradiates the workpiece through the optical glass.
The high-temperature laser shock strengthening device also comprises a constrained layer circulating device; the constrained layer circulating device comprises an oil tank, an oil pump, an electric flow control valve and a nozzle which are sequentially connected, and an outlet of the nozzle is opposite to the workpiece.
the oil tank is connected with a funnel, and the funnel is arranged below the workpiece.
A high-temperature laser shock peening method comprises the following steps:
A) Starting a laser to preheat, opening a protective cover, placing a workpiece coated with a black paint absorption layer on a workpiece support frame, fixing the workpiece by using a clamp, adjusting a nozzle to align the workpiece, and closing the protective cover;
B) adjusting the motion platform to enable the laser to be aligned to the area to be impacted;
C) Opening a gas cylinder valve to fill the protective cover with protective gas;
D) Setting heating temperature on a digital display controller and supplying power to a heating rod;
E) Starting a constant pressure oil pump and a flow control valve;
F) And adjusting parameters of the laser, starting the laser and the motion platform after the heating temperature reaches a set value, and performing laser shock peening according to an appointed track.
The invention has the following beneficial effects and advantages:
(1) The temperature sensor, the alternating current contactor, the digital display controller, the heating rod and the heating plate are used for realizing closed-loop control of the temperature, so that the temperature of the workpiece is always stabilized at a set value, and the effect of high-temperature laser shock peening is ensured.
(2) The protective gas generating device composed of the gas cylinder, the gas pipe, the protective cover and the like can ensure that the workpiece is always protected by the protective gas in the processing process, can avoid the workpiece from being oxidized in a high-temperature environment,
(3) the rapid clamping device consisting of the support frame and the rapid clamp can realize rapid positioning and clamping of the workpiece, and the tweezers are used in a matched mode to clamp the workpiece, so that the heating plate can be prevented from scalding operators.
(4) The circulation device of the constraint layer adopts a constant pressure oil pump and a flow control valve, and can ensure the stable output of the constraint layer.
(5) the device has comprehensive functions, simple and compact structure and low cost.
(6) This patent adopts the inert gas protection in order to prevent the metal surface oxidation, and protection gas generating device makes the work piece be in under inert gas's protection throughout in the course of working, has not only realized the anti-oxidation of metal and has handled, still has simple structure, the advantage of the operation of being convenient for.
Drawings
Fig. 1 is a schematic structural diagram of a temperature-controllable and oxidation-resistant high-temperature laser shock peening apparatus of the present invention.
Fig. 2 is a partially enlarged schematic view of a portion of the clamping device and the heating device of fig. 1.
Fig. 3 is a diagram of relative positions of the support frame and the workpiece according to the invention.
FIG. 4 is a flow chart of the closed loop control of the temperature control system of the present invention.
in the figure: 1. a pulsed laser; 2. a planar optical glass; 3. a protective cover; 4. clamping; 5. a workpiece; 6. a nozzle; 7. a support frame; 8. heating plates; 9. a connecting plate; 10. a temperature sensor; 11. a heating rod; 12. an AC contactor; 13. a digital display controller; 14. a six-axis linkage manipulator; 15. an electrically operated flow control valve; 16. a constant pressure oil pump; 17. an oil tank; 18. a gas cylinder.
Detailed Description
The present invention will be described in further detail with reference to examples.
The high-temperature laser shock strengthening device at least comprises a laser, a motion platform, a heating platform, a temperature control device and a protective gas generating device. Heating platform include heating rod and hot plate, the heating rod is in the same place with the assembly of heating plate clearance fit, the hot plate passes through the bolt rigid coupling on the safety cover, the safety cover passes through the bolt rigid coupling on motion platform, with be fixed with on the one side safety cover that the hot plate is relative, be equipped with plane optical glass, this plane optical glass is full lens, laser can directly act on the work piece through this plane optical glass. The heating plate is heated by heat generated by electrifying the heating rod; the temperature control device comprises a temperature sensor, a digital display controller and an alternating current contactor, wherein one end of the temperature sensor is connected to the heating plate through threads to measure the temperature of the heating plate, the other end of the temperature sensor is clamped on the digital display controller to realize signal conversion and display real-time temperature, one end of the alternating current contactor is connected with the heating rod, the other end of the alternating current contactor is connected with the digital display controller, the whole temperature control forms a closed loop, the accurate control of the temperature of the heating plate can be realized, and two stages of power wires are respectively connected to the digital display controller and the alternating current contactor to supply power to the whole temperature control; the protective gas circulating device comprises a gas cylinder, a protective cover (the protective cover has two functions, one is a gas environment for providing isolation for a heated workpiece, the other is a gas environment for preventing a restraint layer substance (restraint layer liquid, such as silicon oil) from splashing to the outside, and collecting the restraint layer substance to convey a fuel feeding tank through an oil pipe) and a gas pipe and the like, the gas cylinder, the protective cover and the gas pipe are connected through pipe threads to increase the sealing property, and an air inlet and an air outlet are processed on the protective cover to ensure that the protective gas is completely filled with the whole protective cover. The protection gas generating device that this patent adopted can make the work piece be in under gaseous protection all the time in the course of working, has not only realized anti-oxidation of metal and has handled, still has simple structure, the advantage of the operation of being convenient for. The apparatus may further comprise a constrained layer circulation apparatus. The material of the constraint layer is high-temperature-resistant liquid, and the constraint layer device comprises an oil tank, a constant-pressure oil pump, an electric flow control valve, an oil pipe and a spray head which are connected through pipe threads to increase the sealing property.
The device may also include a quick clamping device. The rapid clamping device comprises a rapid clamp, a workpiece supporting frame and a connecting plate, the supporting frame is connected to the heating plate through a bolt, the rapid clamp is fixed to the connecting plate through a bolt, and then the connecting plate is fixed to the heating plate.
the digital display controller in the temperature control device controls the on-off of the alternating current contactor by comparing the set temperature with the measured temperature, so that the working state of the heating rod is determined. When the measured temperature is lower than the set temperature, the alternating current contactor is closed all the time, the heating rod is powered on, the temperature of the heating plate rises, the alternating current contactor is disconnected when the measured temperature reaches the set temperature, and the heating rod is powered off to stop heating, so that the temperature of the heating plate is controlled.
The heating plate is connected with the moving platform through the protection cover bottom plate, a through hole for the spray head and the heating rod to pass through is processed on the protection cover bottom plate, and after the positions of the spray head and the lead are fixed, a sealing plug is additionally arranged in a hole gap to prevent a large amount of air from entering the protection cover in the processing process.
The temperature control device with a closed loop is adopted to accurately control the temperature of the workpiece during laser shock peening, and the protective gas generating device is adopted to ensure that the workpiece is filled with protective gas all the time around the processing process so as to avoid rapid oxidation of the workpiece in a high-temperature environment. It comprises the following steps:
A) The laser is started to preheat, the protective cover is opened, the work piece coated with the black paint absorption layer is placed on the supporting frame through the tweezers, the work piece is clamped through the quick clamp, the position of the oil nozzle is adjusted to enable the oil nozzle to be aligned to the work piece, and the protective cover is closed.
B) and adjusting the motion platform to enable the laser to be aligned to the area to be impacted.
C) And opening the gas cylinder valve to fill the protective cover with protective gas.
D) The heating temperature is set on the digital display controller, and the heating rod is powered on.
E) The constant pressure oil pump is started and adjusted to a proper pressure, and the flow control valve is started and the flow is adjusted to ensure that the thickness of oil injection is about 2 mm.
F) And adjusting parameters of the laser, starting a laser gate and a motion platform after the heating temperature is stabilized at a set value, and performing high-temperature laser shock peening according to an appointed track.
G) After the impact process is finished, the laser, the motion platform and the constant-pressure oil pump are closed, the heating rod is powered off, the protective cover is opened, the workpiece is taken out, and finally the gas cylinder is closed.
The first embodiment.
as shown in fig. 1 and 2.
A temperature-controllable and oxidation-resistant high-temperature laser shock peening equipment at least comprises: the device comprises a laser, a motion platform, a heating platform, a temperature control device and a protective gas generating device. The heating platform comprises a heating rod and a heating plate, a blind hole for mounting the heating rod, a threaded hole for mounting a temperature sensor and a through hole for mounting the temperature sensor are formed in the heating plate, the heating rod and the heating plate are assembled together in a clearance fit mode, the heating plate is fixedly connected to the moving platform through bolts, and the heating plate is heated by heat generated by electrifying the heating rod; the temperature control device comprises a temperature sensor, a digital display controller and an alternating current contactor, one end of the temperature sensor is connected to the heating plate through threads to measure the temperature of the heating plate, the other end of the temperature sensor is clamped on the digital display controller to realize signal conversion and display real-time temperature, one end of the alternating current contactor is connected with the heating rod, the other end of the alternating current contactor is connected with the digital display controller, the controller controls the on-off of the alternating current contactor by comparing the set temperature with the measured temperature to determine the working state of the heating rod, further realize the control of the temperature of the heating plate, the whole temperature control forms a closed loop, the accurate control of the temperature of the heating plate can be realized, and two stages of power wires are respectively connected to the digital display controller and the alternating current contactor to supply; the protective gas circulating device comprises a gas cylinder, a protective cover, a gas pipe and the like, the gas cylinder, the protective cover and the gas pipe are connected through pipe threads to increase the sealing performance, and a gas inlet and a gas outlet are processed on the protective cover to ensure that the protective gas is completely filled in the whole protective cover.
The apparatus may further comprise a constrained layer circulation device. The constraint layer device comprises an oil tank, a constant pressure oil pump, an electric flow control valve, an oil pipe and a spray head, and the oil tank, the constant pressure oil pump, the electric flow control valve, the oil pipe and the spray head are connected through pipe threads to increase the sealing performance. The constraint layer circulating device can ensure the stable output of the constraint layer.
The device may also include a quick clamping device. The rapid clamping device comprises a rapid clamp, a workpiece supporting frame and a connecting plate, wherein the size of the supporting frame is determined according to the size of a workpiece, the punching size of the supporting frame is slightly larger than the size of the workpiece, the supporting frame is connected to the heating plate through a bolt, the rapid clamp is fixed on the connecting plate through the bolt, and then the connecting plate is fixed on the heating plate. The rapid clamping device can realize rapid positioning and clamping of the workpiece, and the forceps are used in a matched mode to clamp the workpiece, so that the heating plate can be prevented from scalding operators.
The digital display controller in the temperature control device controls the on-off of the alternating current contactor by comparing the set temperature with the measured temperature, thereby determining the working state of the heating rod. When the measured temperature is lower than the set temperature, the AC contactor is closed all the time, the heating rod is powered on, the temperature of the heating plate rises, and when the measured temperature reaches the set temperature, the AC contactor is disconnected, and the heating rod is powered off to stop heating, so that the temperature of the heating plate can be accurately controlled.
The heating plate is connected with the moving platform through the protection cover bottom plate, wherein the protection cover bottom plate is made of metal with high melting point, such as aluminum with low density, a through hole for the spray head and the heating rod to pass through is processed on the protection cover bottom plate, and after the spray head and the lead are fixed, a sealing plug is additionally arranged in a hole gap to prevent a large amount of air from entering the protection cover in the processing process.
A temperature-controllable and anti-oxidation high-temperature laser shock strengthening device comprises a pulse laser 1; k9 plane optical glass 2; a protective cover 3; a quick clamp 4; a workpiece 5; a nozzle 6; a support frame 7; a heating plate 8; a connecting plate 9; a temperature sensor 10; a heating rod 11; an AC contactor 12; a digital display controller 13; a six-axis linkage manipulator 14; an electric flow control valve 15; a constant pressure oil pump 16; an oil tank 17; a gas cylinder 18. The workpiece coated with the black paint is placed on a support frame to achieve rapid positioning, a rapid clamp clamps the workpiece on a heating plate by using a dead point position, the support frame is fixed on the heating plate through a bolt, the rapid clamp is fixed on a connecting plate through a bolt, the connecting plate is fixed on the heating plate through a bolt, the heating plate is fixed on a protective cover bottom plate through a bolt, the protective cover bottom plate is fixed on a motion platform (a six-axis linkage manipulator) through a bolt, and the motion platform drives the workpiece to achieve spatial movement; the heating rod and the heating plate are assembled together in a clearance fit mode, the heating rod supplies heat to the heating plate through heat conduction, one end of the temperature sensor is connected to the heating plate through threads to measure the temperature of the heating plate, the other end of the temperature sensor is clamped on the digital display controller to achieve signal conversion and display of real-time temperature, one end of the alternating current contactor is connected with the heating rod, the other end of the alternating current contactor is connected with the digital display controller, and the controller controls the on-off of the alternating current contactor by comparing the set temperature with the measured temperature, so that the working state of the heating rod is determined, and the temperature of the heating plate is controlled; the air outlet of the air bottle is connected with an air pipe, the other end of the air pipe is connected with the air inlet of the protective cover, and the air bottle, the air pipe and the protective cover are connected through pipe threads to improve the sealing performance; the oil drain port of safety cover bottom is connected to oil tank one end to collect nozzle spun fluid, the other end is connected on the constant voltage oil pump, the constant voltage oil pump other end is connected on electric flow control valve, fluid evenly spouts by the nozzle after constant voltage oil pump and flow control valve, through the pipe threaded connection in order to increase the leakproofness between safety cover, oil tank, constant voltage oil pump, electric flow control valve, shower nozzle and the oil pipe, the device is shown in fig. 1-3.
Example two.
As shown in fig. 1-4.
a temperature-controllable and anti-oxidation high-temperature laser shock peening method adopts a temperature control device of closed-loop control, can accurately control the temperature of a workpiece during laser shock peening, adopts a shielding gas generating device, can enable the workpiece to be filled with shielding gas all the time around the machining process, can effectively avoid the rapid oxidation of the workpiece under a high-temperature environment, can realize the rapid positioning and clamping of the workpiece by a rapid clamping device, and ensures the stable output of a constraint layer by adopting a constant-pressure oil pump and an electric flow control valve as a constraint layer circulating device. The device has the advantages of simple structure, low cost and wide application range, and can realize better high-temperature laser shock peening experiment effect. The method comprises the following basic operation steps:
A) The laser is started to preheat, the protective cover is opened, the work piece coated with the black paint absorption layer is placed on the supporting frame through the tweezers, the work piece is clamped through the quick clamp, the position of the oil nozzle is adjusted to enable the oil nozzle to be aligned to the work piece, and the protective cover is closed.
B) And adjusting the motion platform to enable the laser to be aligned to the area to be impacted.
C) And opening the gas cylinder valve to fill the protective cover with protective gas.
D) The heating temperature is set on the digital display controller, and the heating rod is powered on.
E) The constant pressure oil pump is started and adjusted to a proper pressure, and the flow control valve is started and the flow is adjusted to ensure that the thickness of oil injection is about 2 mm.
F) And adjusting parameters of the laser, starting the laser to close the brake and the motion platform after the heating temperature is stabilized at a set value, and performing high-temperature laser shock peening according to an appointed track.
G) After the impact process is finished, the laser, the motion platform and the constant-pressure oil pump are closed, the heating rod is powered off, the protective cover is opened, the workpiece is taken out, and finally the gas cylinder is closed.
Taking GH4169 nickel-based alloy as an example, the basic operation steps are as follows:
A) starting a laser to preheat, opening a protective cover, using tweezers to place a GH4169 nickel-based alloy workpiece coated with a black paint absorption layer on a support frame, clamping the workpiece by using quick clamps, adjusting the position of an oil nozzle to align the oil nozzle to the workpiece, and closing the protective cover.
B) And adjusting the motion platform to enable the laser to be aligned to the area to be impacted.
C) And opening the gas cylinder valve to fill the protective cover with protective gas.
D) The heating temperature was set to 240 ℃ on the digital display controller and the heating rod was energized.
E) Starting the constant pressure oil pump and adjusting the constant pressure oil pump to 1.1GPa, and starting the flow control valve and adjusting the flow to ensure that the oil injection thickness is about 2 mm.
F) Adjusting the single pulse energy of the laser to be 6J, the pulse frequency to be 1Hz, and starting the laser to close the brake and the motion platform when the temperature to be heated is stabilized at 240 ℃, and performing high-temperature laser shock peening treatment according to the specified track.
G) And after the impact process is finished, closing the laser, the motion platform and the constant-pressure oil pump, powering down the heating rod, opening the protective cover, taking out the GH4169 nickel-based alloy workpiece, and finally closing the gas cylinder.
After the GH4169 nickel-based alloy is subjected to high-temperature laser shock strengthening by using the method, the surface microhardness is increased by 22 percent compared with that of the base material, and the oxygen content of the surface material is 0.07 percent; the GH4169 nickel-based alloy sample obtained by adopting the non-closed-loop temperature control and the non-oxidation prevention device has the surface microhardness increased by 17% compared with that of the base material and the oxygen content of the surface material is 0.13%, which shows that the temperature-controllable and anti-oxidation high-temperature laser shock strengthening equipment can obtain better strengthening effect.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (10)
1. a high-temperature laser shock peening apparatus is characterized by comprising: the device comprises a laser (1), a motion platform, a heating platform, a temperature control device and a protective gas generating device;
a temperature control device is arranged on the heating platform; the heating platform is connected with the moving platform through a protective gas generating device; the light outlet of the laser (1) is opposite to the heating platform.
2. A high-temperature laser shock peening apparatus according to claim 1, wherein the heating stage comprises a heating rod (11) and a heating plate (8); and a heating rod (11) is arranged on the heating plate (8) and is fixed on the moving platform.
3. A high-temperature laser shock peening apparatus according to claim 2, wherein the heating rod (11) is plural and arranged in the heating plate (8).
4. A high-temperature laser shock peening apparatus according to claim 1 or 2, wherein the heating stage is provided with a clamping device; the clamping device comprises a clamp (4), a workpiece supporting frame (7) and a connecting plate (9); the heating plate is characterized in that the workpiece support frame (7) and the connecting plate (9) are arranged on the heating plate (8) in parallel, a workpiece (5) is fixed on the workpiece support frame (7), and a clamp (4) used for fixing the workpiece is arranged on the connecting plate (9).
5. a high-temperature laser shock peening apparatus according to claim 2, wherein the temperature control apparatus comprises a temperature sensor (10), a digital display controller (13) and an ac contactor (12) which are connected in sequence; the temperature sensor is arranged on the heating plate (8); the alternating current contactor is connected with the heating rod (11).
6. A high-temperature laser shock peening apparatus according to claim 1, wherein the shielding gas generating means includes a gas cylinder (18) and a protective cover (3); a heating platform is arranged in the protective cover (3), and the outer part of the protective cover (3) is connected with the moving platform; a gas cylinder (18) is arranged outside the protective cover (3); the gas cylinder (18) is communicated with the interior of the protective cover (3) through a gas pipe.
7. a high-temperature laser shock peening apparatus according to claim 6, wherein the base plate of the protective cover (3) is connected to the motion platform, and a flat optical glass (2) is provided on the side opposite to the base plate; the laser emitted by the laser (1) irradiates a workpiece (5) through the optical glass (2).
8. The high-temperature laser shock peening apparatus according to claim 1, further comprising a constraining layer circulation means; the constrained layer circulating device comprises an oil tank (17), an oil pump (16), an electric flow control valve (15) and a nozzle (6) which are sequentially connected, and an outlet of the nozzle (6) is opposite to the workpiece (5).
9. A high-temperature laser shock peening apparatus according to claim 8 wherein a funnel is connected to the oil tank (17) and is located below the workpiece (5).
10. A high-temperature laser shock peening method is characterized by comprising the following steps:
A) Starting a laser (1) for preheating, opening a protective cover (3), placing a workpiece (5) coated with a black paint absorption layer on a workpiece support frame (7) and fixing the workpiece by using a clamp (4), adjusting a nozzle (6) to align to the workpiece (5), and closing the protective cover (3);
B) Adjusting the motion platform to enable the laser to be aligned to the area to be impacted;
C) Opening a valve of the gas cylinder (18) to fill the protective gas in the protective cover (3);
D) Setting heating temperature on a digital display controller (13) and supplying power to a heating rod;
E) Starting a constant pressure oil pump (16) and a flow control valve (15);
F) And adjusting parameters of the laser (1), starting the laser (1) and the motion platform after the heating temperature reaches a set value, and performing laser shock peening according to a specified track.
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