阅读说明：本技术 一种基于双脉冲强激光技术的孔类零件内壁喷涂方法和装置 (Method and device for spraying inner wall of hole part based on double-pulse strong laser technology ) 是由 张兴权 王振伟 隋凤利 钱健清 刘侠 马群双 杨恒基 陈涛 于 2019-12-26 设计创作，主要内容包括：本发明公开一种基于双脉冲强激光技术的孔类零件内壁喷涂方法和装置,属于零件内壁喷涂技术领域。该装置包括夹具系统、加热保护系统、双脉冲激光发生器、导光系统及控制系统。该装置使用双脉冲激光发生器先发出一个强激光脉冲束熔融喷涂材料,再发出一个强激光脉冲束作用在熔融的喷涂材料上,熔融材料吸收激光能量产生的高压等离子体瞬间对熔融材料施加一向下的超高冲击力,使熔融材料溅射,溅射的熔滴在零件内部雾化成更为细小的微粒,并高速撞向零件内壁,形成涂层；且溅射到内壁上的喷涂材料在向零件内壁传递热量,为了避免较大的内应力使涂层产生裂纹,在喷涂过程中对零件进行加热。本装置结构简单、操作方便、适用性广、涂层质量好。(The invention discloses a method and a device for spraying the inner wall of a hole part based on a double-pulse strong laser technology, and belongs to the technical field of spraying of the inner wall of the part. The device comprises a clamp system, a heating protection system, a double-pulse laser generator, a light guide system and a control system. The device uses a double-pulse laser generator to firstly emit a strong laser pulse beam to melt a spraying material, and then emit a strong laser pulse beam to act on the melted spraying material, the melting material absorbs high-pressure plasma generated by laser energy to instantly apply downward ultrahigh impact force to the melting material, so that the melting material is sputtered, and sputtered molten drops are atomized into finer particles in a part and collide against the inner wall of the part at high speed to form a coating; and the spray material sputtered on the inner wall transfers heat to the inner wall of the part, so that the part is heated in the spray process in order to avoid cracks generated on the coating due to large internal stress. The device has the advantages of simple structure, convenient operation, wide applicability and good coating quality.)

1. A method for spraying the inner wall of a hole part based on a double-pulse strong laser technology is characterized by comprising the following specific steps:

(1) after the device is installed, the computer (30) sends a signal to the controller (29), so that the controller (29) controls the air inlet switch (9) and the air heater (7) to be opened simultaneously, and protective gas is introduced into the spraying chamber (10);

(2) the computer (30) sends a signal to the controller (29) so that the controller (29) controls the electrification of the electrothermal tube (12);

(3) the computer (30) sends a signal to the controller (29) so that the controller (29) controls the double-pulse laser generator (1) to firstly send out a pulse width with the magnitude of ms and the power density of 10⁵-10⁶W/cm²The strong laser pulse beam (3) within the range is vertically and directly irradiated on the upper end surface of the spraying material rod (22), and the spraying material on the upper end surface of the spraying material rod (22) absorbs laser energy to be melted and form a molten pool; the double-pulse laser generator (1) sends out a power density higher than 10⁸W/cm²The strong laser pulse beam (3) with the pulse width of ns magnitude vertically and directly irradiates the surface of a molten material in the molten pool, a part of the molten material absorbs high-pressure plasma generated by laser energy and instantly applies downward ultrahigh impact force to the molten material, so that the molten material is sputtered, sputtered molten drops are atomized into finer particles in the hole parts, the particles collide against the inner wall of the hole parts (23) at a high speed, and a spray coating (24) is formed to finish primary spraying;

(4) enabling the computer (30) to send a signal to the controller (29), and enabling the controller (29) to control a window cleaning device (28) to clean objects attached to the transparent glass (27);

(5) when the thickness of the spray coating (24) of the first impact spraying does not meet the requirement and multiple spraying needs to be carried out at the same position; repeating the step (3) and the step (4) once, so as to finish the second spraying of the inner wall of the hole part (23); repeating the step (3) and the step (4) for multiple times until the coating thickness at the position meets the requirement;

(6) when spraying is needed to be carried out at different positions, the computer (30) sends a signal to the controller (29), so that the controller (29) controls the second lifting table (16) and the hole parts (23) on the second lifting table to move; repeating the step (3) and the step (4) for multiple times until the spraying of a new position is finished until the spraying coating (24) on the inner wall of the hole part (23) meets the requirement; and then, the switches of the air heater (7) and the electric heating tube (12) are closed, the hole parts (23) are slowly cooled in the heated spraying chamber (10), when the spraying coating (24) is cooled to a set temperature, the introduction of protective gas is stopped, the second clamp (15) is loosened, the movable window (25) is opened, the hole parts (23) are taken out, and the spraying of the inner walls of the hole parts is completed.

2. The utility model provides a hole class part inner wall spraying device based on strong laser technique of dipulse, its characterized in that the device includes anchor clamps system, heating protection system, dipulse laser generator (1), leaded light system and control system: the clamp system comprises a hole part (23), a spraying material rod (22), a second sealing ring (14), a third sealing ring (17), a soft gasket (26), a gland (6), a first lifting table (18), a second lifting table (16), a first clamp (19) and a second clamp (15), wherein the gland (6) and the soft gasket (26) are positioned at the upper part of a spraying chamber (10), the rest parts in the clamp system are positioned at the lower part of the spraying chamber (10), the second sealing ring (14) is installed on an annular groove formed at the bottom of the spraying chamber (10), the hole part (23) penetrates through the inner ring of the second sealing ring (14) and forms fit with the second sealing ring (14), the hole part (23) is placed on the second clamp (15), and the second clamp (15) is fixed on the second lifting table (16), the second clamp (15) clamps the hole parts (23), the third sealing ring (17) is arranged on an annular groove arranged in the middle of the second lifting platform (16), the spray material rod (22) penetrates through the inner ring of the third sealing ring (17) and is matched with the third sealing ring (17), the spraying material rod (22) is placed on the first clamp (19), the first clamp (19) is fixed on the first lifting platform (18), the first clamp (19) clamps the spraying material rod (22), the soft gasket (26) is placed on the step of the side wall of the upper part of the spraying chamber (10), the transparent glass (27) is placed on the soft gasket (26), the gland (6) is matched with the side wall of the upper part of the spraying chamber (10) through threads, and the gland (6) compresses the transparent glass (27); the heating protection system comprises a spraying chamber (10), a heat insulation coating (11), a movable window (25), an air inlet switch (9), an air inlet pipe (8), a first sealing ring (13), an electric heating pipe (12), an air heater (7), a one-way valve (20) and an exhaust pipe (21), wherein the movable window (25) is positioned on the left side of the spraying chamber (10), the one-way valve (20) and the exhaust pipe (21) are positioned on the left lower side of the spraying chamber (10), the air inlet switch (9), the air inlet pipe (8) and the air heater (7) are positioned on the right upper side of the spraying chamber (10), other components in the heating protection system are positioned on the right lower side of the spraying chamber, the heat insulation coating (11) is coated on the inner wall of the spraying chamber (10), the air heater (7) is installed at the air inlet, the air inlet pipe (8) is installed on the air heater (7), the air inlet switch (9) is installed on the air inlet pipe (8), the first sealing ring (13) is installed on an annular groove arranged at the junction of the tail of the electric heating pipe (12) and the side wall of the spraying chamber (10), the tail of the electric heating pipe (12) penetrates through the inner ring of the first sealing ring (13), the tail of the electric heating pipe (12) is matched with the first sealing ring (13), the one-way valve (20) is installed at the air outlet, and the air outlet pipe (21) is installed on the one-way valve (20); the light guide system comprises a light guide pipe (2), a total reflection mirror (4), an impact head (5), transparent glass (27) and a window cleaning device (28), the light guide system is positioned above the spraying chamber (10), one end of the light guide pipe (2) is connected with the double-pulse laser generator (1), the other end of the light guide pipe (2) is connected with the impact head (5), the window cleaning device (28) is installed on the transparent glass (27), and the lower part of the impact head (5) is right opposite to the spraying material rod (22); the control system comprises a computer (30) and a controller (29), the computer (30) sends signals to the controller (29), and the controller (29) is respectively connected with the double-pulse laser generator (1), the air inlet switch (9), the air heater (7), the electric heating tube (12), the first lifting table (18), the second lifting table (16) and the window cleaning device (28) through data lines.

The technical field is as follows:

the invention belongs to the field of spraying of inner walls of parts, and particularly relates to a method and a device for spraying inner walls of hole parts based on a double-pulse strong laser technology. The power density of the invention is 10⁵-10⁶W/cm²In the range, the pulse width is ms magnitude strong laser melting spraying material rod, the power density is higher than 10⁸W/cm²The method and the device are suitable for spraying the inner wall of the part.

Background art:

the laser technology is one of the most important technological achievements in the 60's of the 20 th century, and the emergence of the laser technology almost plays a great role in reforming and promoting the development of the whole technological field. At present, a plurality of application technical fields such as laser processing technology, laser detection and metering technology and the like are formed by combining a plurality of disciplines.

The interaction between the laser and the material with different parameters produces different effects, for example, the laser with low power density acts on the material to generate the phenomenon of heating and melting, and the laser with higher power density acts on the material to generate the phenomenon of gasifying and generating plasma.

In one method disclosed in chinese patent CN108707853A, a spray material is thermally sprayed onto the inner wall of a cylinder bore, and then a portion of the coating is remelted with a laser to anchor the coating to the substrate, the power density of the laser used in this patent being in a lower range; in a method disclosed in chinese patent CN108018519A, a strengthening layer or a strengthening ring is attached to the upper part of a cylinder bore by laser welding or cladding, and then a spray material is sprayed on the inner wall by thermal spraying, the power density of the laser used in the patent is also in a lower range, obviously, the two patents do not fully utilize different effects of the laser with different parameters on the material. Moreover, in the methods disclosed in the above patents, thermal spraying and laser cladding are used in combination, so that the whole spraying process is complicated, and the whole device is complicated.

In addition, the existing research results and engineering practices show that the performance and quality of the sprayed coating are not only related to the particle size of the powder, the spraying speed of the powder and the like, but also related to the heat treatment of the part in the spraying process. Because the material composition of the sprayed coating and the base body is greatly different, the linear expansion coefficient is greatly different, and because the sprayed material is contacted with the surface of the base body and simultaneously transfers heat to the base body, larger internal stress is caused, so that the coating generates defects such as cracks or peeling in the cooling process, and the quality of the sprayed coating is further influenced.

Based on the problems existing in the part spraying process, the invention designs the method that the power density is firstly used to be 10 under the condition of heat treatment of the part in the spraying process⁵-10⁶W/cm²The strong laser within the range and with the pulse width of ms magnitude directly melts the spraying material, and then the power density is higher than 10⁸W/cm²Strong laser with ns-level pulse width is directly irradiated on the spraying material rod, and part of the melting material absorbs the laser energy to generate high-pressure plasmaThe plasma instantly applies a downward ultrahigh impact force to the molten material to sputter the molten material, the sputtered molten drops are atomized into finer particles in the part and impact the inner wall of the part at a high speed, and then a coating is formed.

The invention content is as follows:

the invention aims to provide a method and a device for spraying the inner wall of a hole part based on a double-pulse strong laser technology. The method for spraying the inner wall of the part based on the double-pulse strong laser technology comprises the following specific steps:

(1) after the device is installed, the computer 30 sends a signal to the controller 29, so that the controller 29 controls the air inlet switch 9 and the air heater 7 to be opened simultaneously, and protective air is introduced into the spraying chamber 10.

(2) The computer 30 sends a signal to the controller 29 so that the controller 29 controls the energization of the electrothermal tube 12.

(3) The computer 30 sends a signal to the controller 29, so that the controller 29 controls the dual pulse laser generator 1 to firstly send a pulse width with ms magnitude and power density of 10⁵-10⁶W/cm²The strong laser pulse beam 3 within the range is vertically and directly irradiated on the upper end surface of the spraying material rod 22, and the part of the spraying material on the upper end surface of the spraying material rod 22 absorbs the laser energy to be melted and form a molten pool; the double-pulse laser generator 1 sends out a power density higher than 10⁸W/cm²And the strong laser pulse beam 3 with the pulse width of ns magnitude vertically and directly irradiates the surface of the molten material in the molten pool, a part of the molten material absorbs high-pressure plasma generated by laser energy and instantly applies downward ultrahigh impact force to the molten material, so that the molten material is sputtered, sputtered molten drops are atomized into finer particles in the hole parts, and the particles collide against the inner wall of the hole parts 23 at a high speed to form a spray coating 24 so as to finish primary spraying.

(4) The computer 30 is caused to send a signal to the controller 29, and the controller 29 is caused to control the window cleaning device 28 to clean the object attached to the transparent glass 27.

(5) When the thickness of the spray coating 24 of the first impact spraying does not meet the requirement and multiple spraying needs to be carried out at the same position; repeating the step (3) and the step (4) once, so as to finish the second spraying of the inner wall of the hole part 23; and (4) repeating the step (3) and the step (4) for a plurality of times until the coating thickness at the position meets the requirement.

(6) When spraying is required to be carried out at different positions, the computer 30 sends a signal to the controller 29, so that the controller 29 controls the second lifting table 16 and the hole parts 23 on the second lifting table to move; repeating the step (3) and the step (4) for multiple times until the spraying of a new position is completed until the spraying coating 24 on the inner wall of the hole part 23 meets the requirement; and then, closing the switches of the air heater 7 and the electric heating tube 12, slowly cooling the hole parts 23 in the heated spraying chamber 10 until the sprayed coating 24 is cooled to a set temperature, stopping introducing the protective gas, loosening the second clamp 15, opening the movable window 25, taking out the hole parts 23, and finishing the spraying of the inner walls of the hole parts.

The invention also provides a part inner wall spraying device based on the double-pulse strong laser technology, which comprises a clamp system, a heating protection system, a double-pulse laser generator 1, a light guide system and a control system, wherein the clamp system comprises a clamp body, a laser beam generator: the clamp system comprises a hole part 23, a spraying material rod 22, a second sealing ring 14, a third sealing ring 17, a soft gasket 26, a gland 6, a first lifting platform 18, a second lifting platform 16, a first clamp 19 and a second clamp 15, wherein the gland 6 and the soft gasket 26 are positioned at the upper part of a spraying chamber 10, other components in the clamp system are positioned at the lower part of the spraying chamber 10, the second sealing ring 14 is installed on an annular groove arranged at the bottom of the spraying chamber 10, the hole part 23 penetrates through the inner ring of the second sealing ring 14 and is matched with the second sealing ring 14, the hole part 23 is placed on the second clamp 15, the second clamp 15 is fixed on the second lifting platform 16, the hole part 23 is clamped by the second clamp 15, the third sealing ring 17 is installed on an annular groove arranged at the middle part of the second lifting platform 16, the spraying material rod 22 penetrates through the inner ring of the third sealing ring 17 and is matched with the third sealing ring 17, the spraying material rod 22 is placed on the first clamp 19, the first clamp 19 is fixed on the first lifting table 18, the spraying material rod 22 is clamped by the first clamp 19, the soft gasket 26 is placed on the step of the side wall of the upper part of the spraying chamber 10, the transparent glass 27 is placed on the soft gasket 26, the gland 6 is matched with the side wall of the upper part of the spraying chamber 10 through threads, and the gland 6 compresses the transparent glass 27; the heating protection system comprises a spraying chamber 10, a heat insulation coating 11, a movable window 25, an air inlet switch 9, an air inlet pipe 8, a first sealing ring 13, an electric heating pipe 12, an air heater 7, a one-way valve 20 and an exhaust pipe 21, wherein the movable window 25 is positioned on the left side of the spraying chamber 10, the one-way valve 20 and the exhaust pipe 21 are positioned on the left lower side of the spraying chamber 10, the air inlet switch 9, the air inlet pipe 8 and the air heater 7 are positioned on the right upper side of the spraying chamber 10, other components in the heating protection system are positioned on the right lower side of the spraying chamber, the heat insulation coating 11 is coated on the inner wall of the spraying chamber 10, the air heater 7 is arranged at the air inlet, the air inlet pipe 8 is arranged on the air inlet pipe 7, the air inlet switch 9 is arranged on the air inlet pipe 8, the first sealing ring 13 is arranged on an annular groove arranged at the junction of the tail part of the, the tail part of the electric heating tube 12 penetrates through the inner ring of the first sealing ring 13, the tail part of the electric heating tube 12 is matched with the first sealing ring 13, the one-way valve 20 is arranged at an exhaust port, and the exhaust pipe 21 is arranged on the one-way valve 20; the light guide system comprises a light guide pipe 2, a total reflection mirror 4, an impact head 5, transparent glass 27 and a window cleaning device 28, the light guide system is positioned above the spraying chamber 10, one end of the light guide pipe 2 is connected with the double-pulse laser generator 1, the other end of the light guide pipe 2 is connected with the impact head 5, the window cleaning device 28 is installed on the transparent glass 27, and the lower part of the impact head 5 is right opposite to the spraying material rod 22; the control system comprises a computer 30 and a controller 29, the computer 30 sends signals to the controller 29, and the controller 29 is respectively connected with the double-pulse laser generator 1, the air inlet switch 9, the air heater 7, the electric heating tube 12, the first lifting platform 18, the second lifting platform 16 and the window cleaning device 28 through data lines.

The invention firstly uses the power density of 10⁵-10⁶W/cm²The strong laser melting spraying material with the pulse width of ms in the range is used, and the later power density is higher than 10⁸W/cm²And strong laser pulse beams with the pulse width of ns magnitude are directly irradiated on the melted spraying material, part of the melted material absorbs laser energy to generate high-pressure plasma, and the high-pressure plasma instantly applies downward ultrahigh impact force to the melted material so as to drive the melted spraying material to be sputtered onto the inner wall of the hole part to finish spraying.

The invention mainly has the following technical advantages:

(1) the device makes full use of different effects of the strong laser with different parameters on the material; the double-pulse laser generator is used for sequentially sending two laser pulse beams with extremely short time intervals to heat and melt the spraying material and then sputter the spraying material, so that the spraying is finished, and the time interval between the melting step and the spraying step is shortened.

(2) The part is in the heated spraying chamber in the spraying process, so that cracks of the sprayed coating on the inner wall of the part due to large internal stress in the cooling process are prevented, and the coating quality is good.

(3) The device adopts the computer to control the lifting platform to move, can accurately control the up-and-down movement of the spraying material rod and the up-and-down movement of the hole parts, thereby conveniently carrying out multiple times of spraying at the same position and spraying at different positions, and having convenient operation.

(4) The material melt is atomized to become finer particles, and the particles collide with the surface of the substrate or the deposited coating at a high speed to generate local deformation (compressive strain), so that the substrate or the deposited coating is fully deformed after the particles collide with the substrate or the deposited coating, the density of the coating and the bonding strength of the coating and the substrate are increased, the porosity is reduced, the cohesive strength is increased, the quality of the coating is improved, and the sprayed coating generates beneficial residual compressive stress.

(5) The laser can ablate any material to generate high-pressure plasma, so the application range is wide, and the spraying materials with different performances can be selected according to the requirement of spraying the coating to prepare coatings with various functions.

Description of the drawings:

FIG. 1 is a schematic structural diagram of a hole part inner wall spraying device based on a double-pulse intense laser technology;

FIG. 2 is a schematic view of the cross-sectional structure A-A in FIG. 1;

fig. 3 is a partial enlarged view at I in fig. 1.

In the figure: 1: a double-pulse laser generator; 2: a light pipe; 3: a beam of intense laser pulses; 4: a total reflection mirror; 5, an impact head; 6: a gland; 7: an air heater; 8: an air inlet pipe; 9: an air inlet switch; 10: a spray chamber; 11: a thermal barrier coating; 12: an electric heating tube; 13: a first seal ring; 14: a second seal ring; 15: a second clamp; 16: a second lifting table; 17: a third seal ring; 18: a first elevating platform; 19: a first clamp; 20: a one-way valve; 21: an exhaust pipe; 22: spraying a material rod; 23: a hole type part; 24: spraying a coating; 25: an active window; 26: a soft gasket; 27: transparent glass; 28: a window cleaning device; 29: a controller; 30: and (4) a computer.

The specific implementation mode is as follows:

the device comprises a clamp system, a heating protection system, a double-pulse laser generator 1, a light guide system and a control system. The clamp system comprises a hole part 23, a spraying material rod 22, a second sealing ring 14, a third sealing ring 17, a soft gasket 26, a gland 6, a first lifting platform 18, a second lifting platform 16, a first clamp 19 and a second clamp 15, wherein the gland 6 and the soft gasket 26 are positioned at the upper part of the spraying chamber 10, and the rest parts in the clamp system are positioned at the lower part of the spraying chamber 10; the second sealing ring 14 is mounted on an annular groove formed in the bottom of the spraying chamber 10, the hole part 23 penetrates through an inner ring of the second sealing ring 14 and is matched with the second sealing ring 14, the second sealing ring 14 is used for preventing air heated in the spraying chamber 10 from leaking in the spraying process, the hole part 23 is placed on the second clamp 15, the second clamp 15 is fixed on the second lifting table 16, and the hole part 23 is clamped by the second clamp 15, so that the hole part 23 and the second lifting table 16 keep moving upwards synchronously; the third sealing ring 17 is mounted on an annular groove formed in the middle of the second lifting table 16, the spraying material rod 22 penetrates through the inner ring of the third sealing ring 17 and is matched with the third sealing ring 17, the third sealing ring 17 is used for preventing heated air inside the spraying chamber 10 from leaking in the spraying process, the spraying material rod 22 is placed on the first clamp 19, the first clamp 19 is fixed on the first lifting table 18, and the first clamp 19 clamps the spraying material rod 22, so that the spraying material rod 22 and the first lifting table 18 keep synchronous movement; the soft gasket 26 is arranged on the step of the side wall right above the spraying chamber 10 and is used for sealing and protecting the transparent glass 27; the transparent glass 27 is placed on the soft gasket 26, the gland 6 is matched with the upper side wall of the spraying chamber 10 through threads, and the gland 6 is used for pressing the transparent glass 27.

The heating protection system comprises a spraying chamber 10, a heat insulation coating 11, a movable window 25, an air inlet switch 9, an air inlet pipe 8, a first sealing ring 13, an electric heating pipe 12, an air heater 7, a one-way valve 20 and an exhaust pipe 21, wherein the movable window 25 is positioned on the left side of the spraying chamber 10, the one-way valve 20 and the exhaust pipe 21 in the heating protection system are positioned on the left lower side of the spraying chamber 10, the air inlet switch 9, the air inlet pipe 8 and the air heater 7 are positioned on the right upper side of the spraying chamber 10, and other components in the heating protection system are positioned on the right lower side of the spraying chamber; the air heater 7 is arranged at the air inlet, the air inlet pipe 8 is arranged on the air heater 7, the air inlet switch 9 is arranged on the air inlet pipe 8, the air heater 7 is used for heating introduced protective gas, the heat insulation coating 11 is coated on the inner wall of the spraying chamber 10, the material used by the heat insulation coating 11 is heat insulation conduction type heat insulation material, the heat insulation coating 11 is used for preventing the heat of the heated protective gas from being conducted to the outside, the first sealing ring 13 is arranged on an annular groove formed at the junction of the tail part of the electric heating pipe 12 and the side wall of the spraying chamber 10 and used for preventing the heated air in the spraying chamber 10 from leaking in the spraying process, the tail part of the electric heating pipe 12 penetrates through the first sealing ring 13, the tail part of the electric heating pipe 12 is matched with the first sealing ring 13, and the electric heating pipe 12 is used for heating, thereby keeping the temperature of the protective gas constant in the spraying process; the check valve 20 is installed at the exhaust port for allowing the exhaust of the heated air during the painting process, thereby maintaining the pressure inside the painting chamber 10 to be stable and preventing the external air from entering the inside of the painting chamber 10, and the exhaust pipe 21 is installed on the check valve 20.

The light guide system comprises a light guide pipe 2, a total reflection mirror 4, an impact head 5, transparent glass 27 and a window cleaning device 28, and is positioned above the spraying chamber 10; one end of the light guide pipe 2 is connected with the double-pulse laser generator 1, the other end of the light guide pipe 2 is connected with the impact head 5, the strong laser pulse beam 3 emitted by the double-pulse laser generator 1 is vertically and directly irradiated on the upper end surface of the spraying material rod 22 through the transparent glass 27 after being totally reflected by the totally reflecting mirror 4, and the window cleaning device 28 is installed on the transparent glass 27 and used for cleaning an object attached to the transparent glass 27, so that the smoothness of a light path is ensured; when the window cleaning device 28 does not clean the object attached to the transparent glass 27, the window cleaning device stops at the left end of the transparent glass 27, so that the smoothness of the light path is not influenced;

the control system comprises a computer 30 and a controller 29, the computer 30 sends signals to the controller 29, and the controller 29 is respectively connected with the double-pulse laser generator 1, the air inlet switch 9, the air heater 7, the electric heating tube 12, the first lifting platform 18, the second lifting platform 16 and the window cleaning device 28 through data lines. Is used for controlling the double-pulse laser generator 1, the air inlet switch 9, the air heater 7, the electric heating tube 12, the window cleaning device 28, the first lifting platform 18 and the second lifting platform 16, particularly controlling the relevant parameters such as the power density and the pulse width of the intense laser pulse beam 3, the spraying times at the same position and the spraying at different positions, the lifting of the first lifting platform 18 and the lifting of the second lifting platform 16 are controlled, the opening and closing of the valve of the air inlet switch 9 are controlled, so that the interior of the spraying chamber 10 is always filled with protective gas in the spraying process, the opening and closing of the air heater 7 are controlled, so that the shielding gas is heated before being introduced into the spraying chamber 10, and the electric heating tube 12 is controlled to be electrified, so that the shielding gas is heated by the electric heating tube 12, thereby ensuring the constant temperature of the shielding gas in the spraying process.

The specific spraying steps are described below with reference to the accompanying drawings:

(1) after the device is installed, the computer 30 sends a signal to the controller 29, so that the controller 29 controls the air inlet switch 9 and the air heater 7 to be opened simultaneously, so that the shielding gas is heated when flowing through the air heater 7, and then flows into the spraying chamber 10 to fill the whole spraying chamber 10.

(2) The computer 30 sends a signal to the controller 29, so that the controller 29 controls the energization of the electrothermal tube 12, so that the electrothermal tube 12 heats the shielding gas, thereby ensuring the temperature of the shielding gas inside the spraying chamber 10 to be constant during the spraying process, and further ensuring that the sprayed coating does not crack due to large internal stress during the cooling process.

(3) The computer 30 sends a signal to the controller 29, so that the controller 29 controls the dual pulse laser generator 1 to firstly send a pulse width with ms magnitude and power density of 10⁵-10⁶W/cm²The strong laser pulse beam 3 within the range is vertically and directly irradiated on the upper end surface of the spraying material rod 22, and the part of the spraying material on the upper end surface of the spraying material rod 22 absorbs the laser energy to be melted and form a molten pool; then emitting a power density higher than 10⁸W/cm²The strong laser pulse beam 3 with the pulse width of ns magnitude vertically and directly irradiates the surface of the molten material in the molten pool, part of the molten material absorbs high-pressure plasma generated by laser energy to instantly apply downward impact force to the molten material, so that the molten material is sputtered, and sputtered molten drops are atomized into finer particles in the hole parts and collide against the inner wall of the hole parts 23 at high speedAnd the sprayed coating 24 is formed, completing the first spraying.

(4) Sending a signal to the controller 29 by the computer 30, so that the controller 29 controls the window cleaning device 28 to clean the objects attached to the transparent glass 27, thereby ensuring the smoothness of the light path; when the window cleaning device 28 does not clean the objects attached to the transparent glass 27, the window cleaning device stops at the left end of the transparent glass 27, so that the smoothness of the light path is not influenced.

(5) When the thickness of the spray coating 24 of the first impact spraying does not meet the requirement and multiple spraying needs to be carried out at the same position; repeating the steps 3 and 4 once, so as to finish the second spraying of the inner wall of the hole part 23; and repeating the steps 3 and 4 for a plurality of times until the coating thickness at the position meets the requirement.

(6) When spraying is required to be carried out at different positions, the computer 30 sends a signal to the controller 29, so that the controller 29 controls the second lifting table 16 and the hole parts 23 thereon to synchronously move upwards; then, repeating the step (3) and the step (4) for multiple times, and completing spraying at a new position until the sprayed coating 24 on the inner wall of the hole part 23 meets the requirement; and then, closing the switches of the air heater 7 and the electric heating tube 12, slowly cooling the hole parts 23 in the heated spraying chamber 10, stopping introducing protective gas when the sprayed coating 24 is cooled to room temperature, loosening the second clamp 15, opening the movable window 25, taking out the hole parts 23, and spraying the next part after the spraying is finished.