CN110877003B - Hole part inner wall spraying method and device based on double-pulse strong laser technology - Google Patents

Abstract

The invention discloses a hole part inner wall spraying method and device based on a double-pulse strong laser technology, and belongs to the technical field of part inner wall spraying. 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 spraying materials, then emits a strong laser pulse beam to act on the melted spraying materials, and the melted materials absorb high-pressure plasmas generated by laser energy to instantly apply a downward ultrahigh impact force to the melted materials, so that the melted materials are sputtered, and the sputtered molten drops are atomized into finer particles in the part and collide against the inner wall of the part at a high speed to form a coating; and the spraying material sputtered on the inner wall transfers heat to the inner wall of the part, so as to avoid the coating from generating cracks due to larger internal stress, and the part is heated in the spraying process. The device has the advantages of simple structure, convenient operation, wide applicability and good coating quality.

Description

A Method and Device for Inner Wall Spraying of Hole Parts Based on Double Pulse Intense Laser Technology

Technical field:

The invention belongs to the field of inner wall spraying of parts, and in particular relates to a method and device for inner wall spraying of hole parts based on double-pulse intense laser technology. The present invention utilizes a strong laser melt-spraying material rod with a power density in the range of 10 ⁵ -10 ⁶ W/cm ² and a pulse width of the order of ms, and uses a power density higher than 10 ⁸ W/cm ² and a pulse width of the order of ns The strong laser is directly irradiated on the molten spraying material, and part of the spraying material absorbs the laser energy to generate high-pressure plasma. Drops are atomized into finer particles inside the part, and hit the inner wall of the part at high speed to form a method and device for coating, which is suitable for spraying the inner wall of the part.

Background technique:

Laser technology is one of the most important scientific and technological achievements in the 1960s. Its appearance has played a major role in reforming and promoting the development of almost the entire scientific and technological field. At present, it has been combined with multiple disciplines to form multiple application technology fields, such as laser processing technology, laser detection and measurement technology, etc.

The effect of the interaction between the laser with different parameters and the material is different. For example, when the laser with low power density acts on the material, the material will heat and melt, while the laser with high power density acts on the material, the material will be melted. Vaporization and plasma generation will occur.

In a method disclosed in Chinese patent CN108707853A, the spray material is thermally sprayed onto the inner wall of the cylinder bore, and then part 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 is It is in the lower range; in a method disclosed by Chinese patent CN108018519A, the method of laser welding or cladding is used to make the reinforcement layer or the reinforcement ring adhere to the upper part of the cylinder bore, and then the spray material is sprayed on the cylinder bore by thermal spraying. On the inner wall, the power density of the laser used in this patent is also in a lower range. Obviously, the above two patents do not make full use of the different effects of lasers with different parameters on materials. Moreover, in the methods disclosed in the above-mentioned patents, thermal spraying and laser cladding are used together, which makes the whole spraying process complicated and the whole device complicated.

In addition, according to the existing research results and engineering practice, the performance and quality of the sprayed coating are not only related to the particle size of the material powder and the spraying speed of the material powder, but also have a great relationship with the heat treatment of the parts during the spraying process. Because the material composition of the sprayed coating and the substrate is very different, the coefficient of linear expansion is also very different, and because the sprayed material is also transferring heat to the substrate when it contacts the surface of the substrate, it will cause a large internal stress, resulting in During the cooling process, the coating produces defects such as cracks or peeling off, which in turn affects the quality of the sprayed coating.

Based on the problems existing in the spraying process of the above-mentioned parts, the present invention designs a power density in the range of 10 ⁵ -10 ⁶ W/cm ² and a pulse width of the order of ms under the condition of heat treatment of the parts in the spraying process. The laser directly melts the sprayed material, and then uses a strong laser with a power density higher than 10 ⁸ W/cm ² and a pulse width of ns level to directly irradiate the sprayed material rod, and part of the molten material absorbs the laser energy to generate high-pressure plasma. The body instantly exerts a downward ultra-high impact force on the molten material, causing the molten material to sputter, and the sputtered droplets are atomized into finer particles inside the part, and hit the inner wall of the part at high speed to form a coating. and devices to solve the above problems.

Invention content:

The object of the present invention is to provide a method and device for spraying the inner wall of hole-type parts based on double-pulse intense laser technology. The specific steps of the part inner wall spraying method based on double-pulse intense laser technology provided by the present invention are as follows:

(1) After the device is installed, the computer 30 sends a signal to the controller 29, so that the controller 29 controls the opening of the intake switch 9 valve and the air heater 7, and feeds the protective gas into the spray booth 10 inside.

(2) The computer 30 sends a signal to the controller 29 so that the controller 29 controls the electric heating tube 12 to be energized.

(3) The computer 30 sends a signal to the controller 29, so that the controller 29 controls the double-pulse laser generator 1 to first send out a pulse width of the order of ms and a power density of 10 ⁵ -10 ⁶ W/cm The strong laser pulse beam 3 within the range of ² makes it vertically and directly irradiate the upper end surface of the spray material rod 22, and the spray material on the upper end surface of the spray material rod 22 absorbs the laser energy and melts to form a molten pool; The double-pulse laser generator 1 then emits a strong laser pulse beam 3 with a power density higher than 10 ⁸ W/cm ² and a pulse width of the order of ns, so that it can be irradiated vertically and directly on the surface of the molten material in the molten pool The high-pressure plasma generated by part of the molten material absorbing laser energy instantly exerts a downward ultra-high impact force on the molten material, causing the molten material to sputter, and the sputtered droplets are atomized into finer particles inside the hole parts. The particles collide with the inner wall of the orifice part 23 at a very high speed, thereby forming a spray coating 24 and completing the first spraying.

(4) Make the computer 30 send a signal to the controller 29 to make the controller 29 control the window cleaning device 28 to clean up the objects attached to the transparent glass 27 .

(5) When the thickness of the sprayed coating 24 of the first impact spraying does not meet the requirement, when it is necessary to spray multiple times at the same position; repeat step (3), step (4) once, so far complete the hole class parts 23 The second spraying of the inner wall; repeat steps (3) and (4) several times until the coating thickness at this position meets the requirements.

(6) When spraying needs to be carried out at different positions, send a signal to the controller 29 by the computer 30, so that the controller 29 controls the movement of the second lifting table 16 and the hole parts 23 thereon; repeat Above-mentioned steps (3), step (4) are many times, finish the spraying of new position so far, until described hole class part 23 inner wall spray coating 24 all reaches the requirement; Afterwards, close described air heater 7 and described electric heater The switch of the pipe 12, the hole parts 23 are slowly cooled in the heated spraying chamber 10, and the sprayed coating 24 is cooled to the set temperature, the protective gas is stopped, and the second clamp is loosened 15. Open the movable window 25, take out the hole parts 23, and complete the inner wall spraying of the hole parts.

The present invention also provides a part inner wall spraying device based on double-pulse intense laser technology, the device includes a fixture system, a heating protection system, a double-pulse laser generator 1, a light guide system and a control system: the fixture system includes hole parts 23. Spraying material rod 22, second sealing ring 14, third sealing ring 17, soft gasket 26, gland 6, first lifting platform 18, second lifting platform 16, first clamp 19 and second clamp 15, The gland 6 and the soft gasket 26 are located on the upper part of the spray booth 10, and the remaining components in the clamp system are located on the lower part of the spray booth 10, and the second sealing ring 14 is installed in the spray booth 10 On the annular groove provided at the bottom, the hole part 23 passes through the inner ring of the second sealing ring 14 and forms a fit with the second sealing ring 14, and the hole part 23 is placed on the second fixture 15 Above, the second fixture 15 is fixed on the second lifting platform 16, the second fixture 15 clamps the hole parts 23, and the third sealing ring 17 is installed on the second lifting platform 16 On the annular groove provided in the middle, the spraying material rod 22 passes through the inner ring of the third sealing ring 17 and forms a fit with the third sealing ring 17, and the spraying material rod 22 is placed on the first clamp 19 Above, the first clamp 19 is fixed on the first lifting table 18, the first clamp 19 clamps the spray material rod 22, and the soft gasket 26 is placed on the upper side wall of the spray booth 10 On the step, the transparent glass 27 is placed on the soft gasket 26, and the gland 6 is threaded to cooperate with the upper side wall of the spray chamber 10, and the gland 6 compresses the transparent glass 27; The heating protection system includes a spray booth 10, a thermal insulation coating 11, a movable window 25, an intake switch 9, an intake 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, the movable window 25 is located on the left side of the spraying chamber 10, the one-way valve 20 and the exhaust pipe 21 are located on the lower left side of the spraying chamber 10, the intake switch 9, the intake pipe 8 And described air heater 7 is positioned at the upper right side of described spraying booth 10, and remaining components in the described heating protection system are positioned at the lower right side of spraying booth, and described thermal insulation coating 11 is coated on the inner wall of described spraying booth 10 Above, the air heater 7 is installed at the air inlet, the air intake pipe 8 is installed on the air heater 7, the air intake switch 9 is installed on the air intake pipe 8, and the first seal The ring 13 is installed on the annular groove provided at the junction of the tail of the electric heating tube 12 and the side wall of the spray chamber 10, the tail of the electric heating tube 12 passes through the inner ring of the first sealing ring 13, and the electric heating tube 12, the tail part is matched with the first sealing ring 13, the one-way valve 20 is installed at the exhaust port, and the exhaust pipe 21 is installed on the one-way valve 20; the light guide system includes a light guide Tube 2, total reflection mirror 4, impact head 5, transparent glass 27 and window cleaning device 28, described light guiding system is positioned at the top of spraying chamber 10, and one end of described light guiding tube 2 is connected with described double-pulse laser generator 1 , the other end of the light pipe 2 is connected to the impact head 5, the window cleaning device 28 is installed on the transparent glass 27, and the bottom of the impact head 5 is facing the spraying material rod 22; the control The system includes a computer 30 and a controller 29, the computer 30 sends a signal to the controller 29, and the controller 29 communicates with the double pulse laser generator 1, the intake switch 9, the 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 are connected.

In the present invention, a strong laser with a power density in the range of 10 ⁵ -10 ⁶ W/cm ² and a pulse width of ms is used to melt spray materials first, and then a power density higher than 10 ⁸ W/cm ² and a pulse width of ns is used. The high-level strong laser pulse beam is directly irradiated on the molten spraying material, and part of the molten material absorbs the laser energy to generate high-pressure plasma, which instantly exerts a downward ultra-high impact force on the molten material, and then drives the molten spraying material Sputter onto the inner wall of hole parts to complete the spraying.

The present invention mainly has the following technical advantages:

(1) This device makes full use of the different effects of strong lasers with different parameters on materials; a double-pulse laser generator is used to send out two laser pulse beams with a very short time interval, first heating the molten spraying material and then sputtering the spraying material, Further, the spraying is completed, and the interval time between the two steps of melting and spraying is shortened.

(2) The parts are in the heated spraying room during the spraying process, which prevents cracks in the sprayed coating on the inner wall of the part due to large internal stress during the cooling process, and the coating quality is good.

(3) The device uses a computer to control the movement of the lifting platform, which can accurately control the up and down movement of the spraying material rod and the up and down movement of the hole parts, so that multiple spraying at the same position and spraying at different positions can be easily performed, and the operation is convenient.

(4) The material melt becomes finer particles after being atomized, and hits the substrate or the deposited coating surface at high speed, causing local deformation (compressive strain), which makes the substrate or the deposited coating deformed after the particle hits Sufficiently, the density of the coating and the bonding strength between the coating and the substrate will be increased, the porosity will be reduced, the cohesive strength will be increased, the coating quality will be better, and the sprayed coating will produce beneficial residual compressive stress.

(5) The laser can ablate any material to generate high-pressure plasma, so it has a wide range of applications. According to the needs of spray coatings, spray materials with different properties can be selected to prepare coatings with various functions.

Description of drawings:

Fig. 1 is a kind of structure schematic diagram of the inner wall spraying device of hole class parts based on double-pulse intense laser technology of the present invention;

Fig. 2 is A-A sectional structure schematic diagram among Fig. 1;

Fig. 3 is a partial enlarged view of I in Fig. 1 .

In the figure: 1: double pulse laser generator; 2: light guide tube; 3: strong laser pulse beam; 4: full mirror; 5: impact head; 6: gland; 7: air heater; 8: air intake pipe ;9: Air intake switch; 10: Spraying room; 11: Heat insulation coating; 12: Electric heating tube; 13: First sealing ring; 14: Second sealing ring; 15: Second fixture; 16: Second lifting platform ;17: The third sealing ring; 18: The first lifting table; 19: The first fixture; 20: Check valve; 21: Exhaust pipe; 22: Spraying material rod; 23: Hole parts; 24: Spraying coating ; 25: movable window; 26: soft gasket; 27: transparent glass; 28: window cleaning device; 29: controller; 30: computer.

Detailed ways:

The device of the present invention includes a fixture system, a heating protection system, a double pulse laser generator 1, a light guide system and a control system. Described fixture system comprises hole class part 23, spraying material rod 22, second sealing ring 14, the 3rd sealing ring 17, soft washer 26, gland 6, the first lifting table 18, the second lifting table 16, the first Clamp 19 and second clamp 15, described gland 6 and soft gasket 26 are positioned at the top of spray booth 10, and remaining parts in the clamp system are positioned at the bottom of spray booth 10; Described second sealing ring 14 is installed in all On the annular groove opened at the bottom of the spraying chamber 10, the hole part 23 passes through the inner ring of the second sealing ring 14 and forms a fit with the second sealing ring 14, and the second sealing ring 14 is used to prevent During the spraying process, the heated air inside the spraying room 10 leaks, the hole parts 23 are placed on the second fixture 15, the second fixture 15 is fixed on the second lifting table 16, and the second fixture 15 to clamp the hole parts 23 so that the hole parts 23 and the second lifting platform 16 keep moving upwards synchronously; On the groove, the spraying material rod 22 passes through the inner ring of the third sealing ring 17 and forms a fit with the third sealing ring 17, and the third sealing ring 17 is used to prevent the interior of the spraying chamber 10 from being heated during the spraying process The leakage of the air, the spraying material stick 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 platform 18 keep moving synchronously; the soft gasket 26 is placed on the side wall step directly above the spraying chamber 10, for sealing and protecting the transparent glass 27; the transparent glass 27 is placed on the soft gasket 26, and the gland 6 is threaded to cooperate with the side wall above the spray chamber 10, and the gland 6 is used to compress the transparent glass 27.

The heating protection system includes a spraying chamber 10, a thermal 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 Air pipe 21, the movable window 25 is located on the left side of the spray booth 10, the one-way valve 20 and exhaust pipe 21 in the heating protection system are located at the lower left side of the spray booth 10, the intake switch 9, the intake tube 8 and the air heater 7 are located on the upper right side of the spray booth 10, and the remaining components in the heating protection system are located on the lower right side of the spray booth; the air heater 7 is installed at the air inlet, and the air intake pipe 8 is installed On the air heater 7, the air intake switch 9 is installed on the air intake pipe 8, the air heater 7 is used to heat the incoming protective gas, and the heat insulating coating 11 is coated on On the inner wall of the spraying chamber 10, the material used for the heat-insulating coating 11 is a heat-insulating conductive heat-insulating material. The heat-insulating coating 11 is used to prevent the heat of the heated protective gas from being conducted to the outside world. The first sealing The ring 13 is installed on the annular groove opened at the junction of the tail of the electric heating tube 12 and the side wall of the spraying chamber 10 to prevent the leakage of the heated air inside the spraying chamber 10 during the spraying process. The tail of the electric heating pipe 12 wears Through the first sealing ring 13, the tail of the electric heating tube 12 is matched with the first sealing ring 13, and the electric heating tube 12 is used to heat the shielding gas, so as to keep the temperature of the shielding gas constant during the spraying process The one-way valve 20 is installed at the exhaust port, and is used to discharge the heated air during the spraying process, so as to maintain the stability of the internal pressure of the spraying room 10, and make the outside air not enter the spraying room 10 Inside, the exhaust pipe 21 is installed on the one-way valve 20 .

Described light guiding system comprises light guiding system 2, total reflection mirror 4, impact head 5, transparent glass 27 and window cleaning device 28, and described light guiding system is positioned at the top of spraying booth 10; One end of described light guiding system 2 is connected The double-pulse laser generator 1, the other end of the light pipe 2 is connected to the impact head 5, and the strong laser pulse beam 3 emitted by the double-pulse laser generator 1 passes through the total reflection mirror 4 The total reflection passes through the transparent glass 27 and directly irradiates the upper end surface of the spraying material rod 22. The window cleaning device 28 is installed on the transparent glass 27 for cleaning the window attached to the transparent glass. 27, so as to ensure the smooth flow of the light path; when the window cleaning device 28 does not clean up the object attached to the transparent glass 27, stop at the left end of the transparent glass 27 so that it will not affect the smooth flow of the light path;

Described control system comprises computer 30 and controller 29, and described computer 30 sends signal to described controller 29, and described controller 29 communicates with described double-pulse laser generator 1, described air intake switch 9 respectively through data lines. , 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 are connected. It is used to control the double-pulse laser generator 1, the air intake switch 9, the air heater 7, the electric heating tube 12, the window cleaning device 28, the first lifting platform 18 and the second The second lifting platform 16 is specifically to control related parameters such as the power density and pulse width of the strong laser pulse beam 3, the number of times of spraying at the same position and the spraying at different positions, control the lifting of the first lifting platform 18 and the The lifting of the second lifting platform 16 controls the opening and closing of the intake switch 9 valves, so that the inside of the spraying chamber 10 is always filled with protective gas during the spraying process, and controls the opening and closing of the air heater 7, so that the protective gas is sprayed when it is passed into. The chamber 10 is heated before, and the electric heating tube 12 is controlled to be powered, so that the electric heating tube 12 heats the shielding gas, so as to ensure the constant temperature of the shielding gas during the spraying process.

Below in conjunction with the accompanying drawings, the specific spraying steps are described:

(1) After the above-mentioned device is installed, the computer 30 sends a signal to the controller 29, so that the controller 29 controls the opening of the air intake switch 9 valve and the air heater 7 switch, so that the protective gas flows through the air heater 7 When heated, it passes to the inside of the spray booth 10 and fills the inside of the entire spray booth 10.

(2) The computer 30 sends a signal to the controller 29, so that the controller 29 controls the energization of the electric heating tube 12, so that the electric heating tube 12 heats the shielding gas, so as to ensure all The temperature of the shielding gas inside the spraying chamber 10 is kept constant, so as to ensure that the sprayed coating will 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 double-pulse laser generator 1 to first send out a pulse width of the order of ms and a power density of 10 ⁵ -10 ⁶ W/cm The strong laser pulse beam 3 within the range of ² makes it vertically and directly irradiate the upper end surface of the spray material rod 22, and part of the spray material on the upper end surface of the spray material rod 22 absorbs the laser energy to melt and form a molten pool; Then emit a strong laser pulse beam 3 with a power density higher than 10 ⁸ W/cm ² and a pulse width of the order of ns, so that it is irradiated vertically and directly on the surface of the molten material in the molten pool, and part of the molten material absorbs the laser light The high-pressure plasma generated by the energy instantly exerts a downward impact on the molten material, causing the molten material to sputter, and the sputtered droplets are atomized into finer particles inside the hole parts, and hit them at a high speed. The inner wall of the orifice part 23 further forms a spray coating 24 to complete the first spraying.

(4) send signal to described controller 29 with described computer 30, make described controller 29 control window cleaning device 28 clean up the object attached on the transparent glass 27, guarantee the smooth flow of light path with this; When described window cleaning device 28 When not cleaning up the attached objects on the transparent glass 27, stop at the left end of the transparent glass 27 so that it will not affect the smooth flow of the light path.

(5) When the thickness of the sprayed coating 24 of the first impact spraying does not meet the requirements, and it is necessary to carry out multiple sprayings at the same position; repeat steps 3 and 4 once, and so far complete the second coating of the inner wall of the hole type part 23 Spray once; repeat steps 3 and 4 several times until the coating thickness at this position meets the requirements.

(6) When it is necessary to spray at different positions, send a signal to the controller 29 through the computer 30, so that the controller 29 controls the synchronization of the second lifting platform 16 and the hole parts 23 thereon Move up; Afterwards, repeat above-mentioned step (3), step (4) multiple times, so far finish the spraying of new position, until described hole class part 23 inner wall spraying coating 24 all reaches requirements; Afterwards, close described air heating The switch of the device 7 and the electric heating tube 12, the hole parts 23 are slowly cooled in the heated spraying chamber 10, and the sprayed coating 24 is cooled to room temperature, stop feeding the protective gas, and loosen the second clamp 15, Open the movable window 25, take out the hole type parts 23, and then carry out the spraying of the next part after completion.

Claims (2)

1. The hole part inner wall spraying device based on the double-pulse strong laser technology is characterized by comprising 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 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 the 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 arranged on an annular groove arranged at 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 hole part (23) is arranged on the second clamp (15), the second clamp (15) is fixed on the second lifting table (16), the second clamp (15) is used for clamping the hole part (23), the third sealing ring (17) is arranged on the second lifting table (16) and is matched with the third sealing ring (17) through the annular groove (17) to form a sealing ring, the first clamp (19) is fixed on the first lifting table (18), the first clamp (19) clamps the spraying material rod (22), the soft gasket (26) is placed on a step of the side wall at 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 at the upper part of the spraying chamber (10) through threads, and the gland (6) presses the transparent glass (27); the heating protection system comprises a spraying chamber (10), a thermal 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), the rest parts in the heating protection system are positioned on the right lower side of the spraying chamber, the thermal insulation coating (11) is coated on the inner wall of the spraying chamber (10), the air heater (7) is arranged at an 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 first sealing ring (13) is arranged on the junction of the electric heating pipe (12) and the sealing ring (12) and passes through the first sealing ring (12) and is arranged on the sealing ring (12), the one-way valve (20) is arranged at the 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), wherein 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 arranged on the transparent glass (27), and the impact head (5) is provided with a Fang Zhengdui spraying material rod (22); the control system comprises a computer (30) and a controller (29), wherein 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.

2. A spraying method of a spraying device according to claim 1, characterized in that the method comprises the following specific steps:

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

(2) The computer (30) sends a signal to the controller (29) so that the controller (29) controls the energization of the electric heating 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 of

Magnitude, power density is +.>

A strong laser pulse beam (3) in a range is vertically and directly irradiated on the upper end face of a spraying material rod (22), and the spraying material on the upper end face part of the spraying material rod (22) absorbs laser energy to be melted and form a molten pool; the double pulse laser generator (1) emits a power density higher than +.>

The strong laser pulse beam (3) with the pulse width of ns is vertically and directly irradiated on the surface of the molten material in the molten pool, and partial molten material absorbs high-pressure plasma generated by laser energy to instantaneously perform opposite meltingApplying a downward ultrahigh impact force to the molten material to enable the molten material to be sputtered, atomizing the sputtered molten drops into finer particles in the hole part, and enabling the particles to collide with the inner wall of the hole part (23) at a high speed so as to form a spraying coating (24), so that the first spraying is finished;

(4) Causing the computer (30) to send a signal to the controller (29), causing the controller (29) to control a window cleaning device (28) to clean an object attached to the transparent glass (27);

(5) When the thickness of the sprayed coating (24) sprayed by the first impact does not meet the requirement and the spraying is required to be carried out for a plurality of times at the same position; repeating the step (3) and the step (4) for one time, and finishing the second spraying of the inner wall of the hole part (23) so far; repeating the step (3) and the step (4) for a plurality of times until the thickness of the coating at the position meets the requirement;

(6) When spraying is required at different positions, a signal is sent to the controller (29) through the computer (30), 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 steps (3) and (4) for a plurality of times, and finishing the spraying of the new position until the inner wall spraying coating (24) 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 spraying coating (24) is cooled to a set temperature, loosening the second clamp (15), opening the movable window (25), taking out the hole parts (23), and finishing the inner wall spraying of the hole parts.

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