CN113046743B - Device and method for magnetic field assisted ultrahigh-speed laser cladding of pipe coatings - Google Patents

Device and method for magnetic field assisted ultrahigh-speed laser cladding of pipe coatings Download PDF

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CN113046743B
CN113046743B CN202110160781.0A CN202110160781A CN113046743B CN 113046743 B CN113046743 B CN 113046743B CN 202110160781 A CN202110160781 A CN 202110160781A CN 113046743 B CN113046743 B CN 113046743B
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laser cladding
magnetic field
speed laser
excitation device
support
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CN113046743A (en
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崔承云
黄洲
束叶玄
鲁金忠
崔熙贵
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Jiangsu University
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Jiangsu University
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Laser Beam Processing (AREA)

Abstract

The invention provides a device and a method for magnetic field assisted ultrahigh-speed laser cladding of pipe coatings, wherein the device comprises an excitation device, a linear motor, a scissor-fork type lifting mechanism, a support bracket, a sensor and a control unit; the scissor type lifting mechanism and the telescopic bracket can meet the processing requirements of pipelines with different inner diameters or lengths; the excitation device is arranged right below the ultrahigh-speed laser cladding processing head and has the same moving speed, and the stable magnetic field generated by the excitation device can obtain refined grains in the cladding layer, improve the structure, reduce the effects of pores and cracks and improve the quality of the cladding layer; the invention can adsorb the powder thrown away due to the rapid rotation of the part by using the magnetic field, thereby improving the utilization rate of the powder and reducing the damage of the powder to human bodies and the pollution to the environment.

Description

Device and method for magnetic field assisted ultrahigh-speed laser cladding of pipe coatings
Technical Field
The invention belongs to the technical field of material processing, and particularly relates to a device and a method for magnetic field assisted ultrahigh-speed laser cladding of pipe coatings.
Background
Ultra-high speed laser cladding is a surface manufacturing technology based on a laser heat source, and the special fusing form of the ultra-high speed laser cladding is different from the traditional laser cladding technology. On the one hand, ultra-high speed laser cladding improves laser energy density. The diameter of a traditional laser cladding light spot is about 2-4 mm, the diameter of an ultra-high-speed laser cladding light spot is smaller than 1mm, and under the same laser energy input condition, the laser energy density in a small light spot area is higher. The laser energy density of the traditional laser cladding is about 70-150W/cm 2, and the laser energy density of the ultra-high speed laser cladding can reach 3kW/cm2 at most. On the other hand, in the traditional laser cladding process, the unmelted powder is directly fed into the molten pool, the converging positions of the laser, the powder and the molten pool are adjusted by the ultra-high-speed laser cladding, the converging position of the powder is higher than the upper surface of the molten pool, and the converged powder enters the molten pool after being irradiated and melted by the laser.
The deposition rate of the ultra-high speed laser cladding is greatly improved compared with the traditional laser cladding by the process adjustment, and the ultra-high speed laser cladding is greatly applied to the field of coating preparation of pipe parts due to the extremely-high processing rate. The reason is that the coating preparation of the plane part needs the laser head to move to realize the movement of the molten pool, and the advantage of ultra-high speed laser cladding cannot be exerted due to the lower movement speed of the laser head. The pipe parts are clamped on the calipers of the machine tool, so that the machine tool can drive the pipe parts to generate a rotation speed, and the moving speed of the laser head is added, so that the moving speed requirement of an ultrahigh-speed laser cladding molten pool can be met.
But the area to be processed of the pipe part is not a flat plane but a curved surface with a radian. Due to the characteristic, when the powder feeding mechanism feeds powder to a designated area, part of the powder can be thrown away due to high-speed rotation of parts, so that economic waste is caused, the health of workers is influenced, and meanwhile certain pollution is caused to the environment. Secondly, in the processing process, part of the powder can also splash due to the action of laser, and once the splashed powder flies into a molten pool which is not condensed, the phenomena of cracking and the like of the coating can be caused, so that the quality of the coating is greatly influenced.
Disclosure of Invention
Aiming at the problems, the invention provides a device and a method for cladding tube coatings by using magnetic field-assisted ultrahigh-speed laser, which utilize a stable and constant magnetic field to obtain refined grains in a cladding layer, improve the structure, reduce the effects of pores and cracks and improve the quality of the cladding layer. Meanwhile, the magnetic field can adsorb the powder thrown away due to the rapid rotation of the part, the utilization rate of the powder is improved, and the harm of the powder to a human body and the pollution to the environment are reduced. The invention discloses a device for preparing a pipe part coating by magnetic field assisted ultrahigh-speed laser cladding, relates to the field of metal material additive manufacturing, and particularly relates to a pipe part surface additive manufacturing technology and an ultrahigh-speed laser cladding technology. Under the action of a steady magnetic field, the effects of refining grains in the cladding layer, improving the structure, reducing pores and cracks and improving the quality of the cladding layer are obtained. Meanwhile, the magnetic field can adsorb the powder which can be thrown away due to the rapid rotation of the part, the utilization rate of the powder is improved, and the harm of the powder to a human body and the pollution to the environment are reduced.
The technical scheme of the invention is as follows: a device for magnetic field assisted ultrahigh-speed laser cladding of pipe coatings comprises an excitation device, a linear motor, a scissor-fork type lifting mechanism, a support bracket, a sensor and a control unit;
the support bracket is used for being installed in a tubular workpiece to be processed, and the tubular workpiece is installed on a machine tool; one end of the supporting bracket is connected with the tailstock of the machine tool, and the other end of the supporting bracket is contacted with the top of the machine tool; a bracket sliding block is arranged on a first sliding rail of the supporting bracket and is connected with a lead screw nut, one end of a lead screw penetrates through the lead screw nut and is installed on a bearing support of the supporting bracket, and the other end of the lead screw is connected with a stepping motor;
the shearing fork type lifting mechanism is used for being installed in a tubular workpiece to be processed, the excitation device is located right below the ultra-high-speed laser cladding processing head, the excitation device is installed on a second base plate, the second base plate is installed on a linear motor rotor, the rotor of the linear motor is connected with a second sliding rail on a stator of the linear motor, and the stator is installed on a first base plate; the first bottom plate is connected with the upper end of the scissor type lifting mechanism, one side of the lower end of the scissor type lifting mechanism is connected with the support sliding block, and the other side of the lower end of the scissor type lifting mechanism is connected with the bearing seat on the support;
the sensor is used for detecting a distance signal between the excitation device and the inner wall of the tubular workpiece above the excitation device; the control unit is respectively connected with the linear motor, the stepping motor and the sensor.
In the scheme, the ultrahigh-speed laser cladding processing head is arranged on the machine tool through a laser head moving support.
In the scheme, the other end of the supporting bracket is in contact with the top of the machine tool through the telescopic bracket, and the telescopic bracket is connected with the driving device.
Further, the driving device is an electric driving device; the driving device is connected with the control unit.
In the above scheme, the scissor lifting mechanism comprises two pairs of connecting rods, the two pairs of connecting rods are arranged in a crossed manner, the middle of each connecting rod is connected through a pin, the upper ends of the connecting rods are respectively connected with the first base plate, the lower end of one connecting rod is connected with the bearing seat on the support sliding block, and the lower end of the other connecting rod is connected with the bearing seat on the support.
In the scheme, one end of the tubular workpiece is arranged on the machine tool through the calipers.
A method for the device for carrying out ultra-high-speed laser cladding on the tube coating based on the magnetic field comprises the following steps:
mounting a tubular workpiece to be processed on the machine tool;
adjusting the position of the tailstock of the machine tool to enable the excitation device to be positioned right below the position where cladding starts;
the step motor works to drive the scissor type lifting mechanism to move, the sensor detects a distance signal between the excitation device and the inner wall of the tube-shaped workpiece above the excitation device and transmits the distance signal to the control unit, and the control unit controls the step motor to lift the excitation device to a preset position; the control unit controls the linear motor to enable the speed of movement of the excitation device to be the same as that of the ultra-high-speed laser cladding processing head; and starting the excitation device to generate a steady magnetic field, and starting the operation of the ultra-high-speed laser cladding processing head to clad.
In the above scheme, the method further comprises the following steps:
the control unit controls the driving device to enable the telescopic support to stretch and retract so as to adapt to machining of tubular workpieces with different lengths.
Compared with the prior art, the invention has the beneficial effects that: the scissor type lifting mechanism and the telescopic bracket can meet the processing requirements of pipelines with different inner diameters or lengths; the excitation device is arranged right below the ultrahigh-speed laser cladding processing head and has the same moving speed, and the stable magnetic field generated by the excitation device can obtain refined grains in the cladding layer, improve the structure, reduce the effects of pores and cracks and improve the quality of the cladding layer; the invention can adsorb the powder thrown away due to the rapid rotation of the part by using the magnetic field, thereby improving the utilization rate of the powder and reducing the damage of the powder to human bodies and the pollution to the environment.
Drawings
FIG. 1 is a schematic diagram of the operation of an apparatus for magnetic field assisted ultra high speed laser cladding of pipe-like coatings according to an embodiment of the present invention mounted on a machine tool;
FIG. 2 is a schematic overall view of an apparatus for magnetic field assisted ultra high speed laser cladding of pipe-like coatings in accordance with an embodiment of the present invention;
fig. 3 is a unit of operation of the apparatus for magnetic field assisted ultra high speed laser cladding of tube-like coatings according to an embodiment of the present invention.
Wherein: 1. the device comprises a machine tool, 2 parts of a machine tool tailstock, 3 parts of a machine tool center, 4 parts of a laser head moving support, 5 parts of an ultra-high-speed laser cladding processing head, 6 parts of calipers, 7 parts of a tubular workpiece, 8 parts of a scissor type lifting mechanism, 9 parts of a first base plate, 10 parts of an excitation device, 11 parts of a stepping motor, 12 parts of a support bracket, 13 parts of a telescopic bracket, 14 parts of a second base plate, 15 parts of a sensor, 16 parts of a stator, 17 parts of a support slider, 18 parts of a lead screw nut, 19 parts of a lead screw, 20 parts of a bearing seat, 21 parts of a first sliding rail, 22 parts of a second sliding rail and 23 parts of a mover.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1, 2 and 3 show a preferred embodiment of the apparatus for magnetic field assisted ultrahigh-speed laser cladding of pipe coatings according to the present invention, which includes an excitation device 10, a linear motor, a scissor-type lifting mechanism 8, a support bracket 12, a sensor 15 and a control unit; the support bracket 12 is used for being installed in a tubular workpiece 7 to be processed, and one end of the tubular workpiece 7 is installed on the machine tool 1 through the caliper 6. One end of a supporting bracket 12 is connected with a machine tool tailstock 2, the other end of the supporting bracket is contacted with a machine tool tip 3 through a telescopic bracket 13, and the telescopic bracket 13 is connected with a driving device; a bracket sliding block 17 is arranged on a first sliding rail 21 of the supporting bracket 12, the bracket sliding block 17 is connected with a screw nut 18, one end of a screw 19 passes through the screw nut 18 and is installed on a bearing support at one end of the supporting bracket 12, and the other end of the screw 19 passes through a bearing seat 20 at the other end of the supporting bracket 12 and is connected with the stepping motor 11; the scissor type lifting mechanism 8 is used for being installed in a tubular workpiece 7 to be machined, the excitation device 10 is located under the ultrahigh-speed laser cladding machining head 5, and the ultrahigh-speed laser cladding machining head 5 is installed on the machine tool 1 through the laser head moving support 4. The excitation device 10 is arranged on a second base plate 14, the second base plate 14 is arranged on a linear motor rotor 23, the linear motor rotor 23 is connected with a second slide rail 22 on a linear motor stator 16, and the stator 16 is arranged on a first base plate 9; the first bottom plate 9 is connected with the upper end of the scissor type lifting mechanism 8, one side of the lower end of the scissor type lifting mechanism 8 is connected with the support sliding block 17, and the other side of the lower end of the scissor type lifting mechanism 8 is connected with the bearing seat on the support bracket 12; the sensor 15 is used for detecting a distance signal between the excitation device 10 and the inner wall of the tubular workpiece 7 above the excitation device; the control unit is connected with the linear motor, the stepping motor 11 and the sensor 15 respectively.
According to this embodiment, preferably, the drive device is an electric drive device; the driving device is connected with the control unit.
According to the embodiment, preferably, the scissor lifting mechanism 8 comprises two pairs of connecting rods, the two pairs of connecting rods are arranged in a crossed manner, the middle of each connecting rod is connected through a pin, the upper ends of the connecting rods are respectively connected with the first bottom plate 9, the lower end of one connecting rod is connected with a bearing seat on the support sliding block 17, and the lower end of the other connecting rod is connected with a bearing seat on the support bracket 12.
The excitation device 10 is used for generating a stable and constant magnetic field and is fixed on the second base plate 14 through a screw, the second base plate 14 is a plastic base plate and is installed on the second slide rail 22, meanwhile, the second base plate is connected with the rotor 23 of the linear motor through a screw, and after the linear motor is electrified, the rotor 23 drives the excitation device 10 to slide on the second slide rail 22, so that the movement following the movement of the ultra-high-speed laser cladding processing head 5 is realized. The second slide rail 22 is fixed to the first base plate 9. Meanwhile, a sensor 15 is arranged on the second bottom plate 14 and used for controlling the distance between the excitation device 10 and the inner wall of the pipe-shaped workpiece 7 above the excitation device. The upper part device is used as a working unit of the device.
A method for the device for carrying out ultra-high-speed laser cladding on the tube coating based on the magnetic field comprises the following steps:
mounting a tubular workpiece 7 to be machined on the machine tool 1;
adjusting the position of the tailstock 2 of the machine tool to enable the excitation device 10 to be positioned right below the position where cladding starts;
the step motor 11 works to drive the scissor type lifting mechanism 8 to move, the sensor 15 detects a distance signal between the excitation device 10 and the inner wall of the tubular workpiece 7 above the excitation device and transmits the distance signal to the control unit, and the control unit controls the step motor 11 to lift the excitation device 10 to a preset position; the control unit controls the linear motor to enable the speed of movement of the excitation device 10 to be the same as that of the ultra-high-speed laser cladding processing head 5; and (3) starting the excitation device 10 to generate a steady magnetic field, starting the operation of the ultrahigh-speed laser cladding processing head 5, starting cladding, and simultaneously driving the excitation device 10 to keep the position of the ultrahigh-speed laser cladding processing head 5 synchronous at a preset speed rate by installing the linear motor. And (3) after cladding is finished, the laser is turned off, the excitation device 10 is turned off, and the scissor type lifting mechanism 8 of the lifting device is reset.
Further comprising the steps of: the control unit controls the driving device to enable the telescopic support 13 to stretch and retract so as to adapt to machining of the tubular workpieces 7 with different lengths. The telescopic support 13 is in contact with the top 3 of the machine tool when the device works, so that the supporting effect is achieved, the driving device is driven by electricity, the length change of the whole device in the transverse direction can be realized, and the purpose of adapting to the processing environments of the tubular workpieces 7 with different lengths is achieved.
Specifically, taking the processing of the tubular workpiece 7 in the main application scene of ultra-high-speed laser cladding as an example:
carrying out preparation work before ultra-high-speed laser cladding: the caliper 6 is installed on a machine tool 1, the tubular workpiece 7 is clamped on the caliper 6, the supporting bracket 12 is connected with the tailstock 2 of the machine tool, the tailstock 2 of the machine tool is pushed to a proper position, the device is placed into the tubular workpiece 7, and the telescopic bracket 13 is started until the telescopic bracket is contacted with the top 3 of the machine tool.
Initializing the ultra-high speed laser cladding device: the ultra-high-speed laser cladding processing head 5 moves to a planned cladding starting position on the laser head moving support 4, the stepping motor 11 is started to drive the lead screw 19 to move, the support sliding block 17 is connected with the lead screw 19 through the lead screw nut 18 and also moves along with the lead screw, the scissor type lifting mechanism 8 is driven to start lifting, and when the sensor 15 senses that the distance between the excitation device 10 and the inner wall of the tubular workpiece 7 reaches a preset value, the control unit controls the stepping motor 11 to stop moving. Then the linear motor is electrified, the second base plate 14 provided with the exciting device 10 and the sensor 15 starts to move on the second slide rail 22 along with the rotor 23 of the connected linear motor, and stops moving when the exciting device 10 is positioned under the ultra-high speed laser cladding processing head 5. And inputting the movement speed of the ultra-high-speed laser cladding processing head 5 in the processing process into a controller unit of the linear motor, so that the movement speed of the mover 23 of the linear motor is consistent with the movement speed of the ultra-high-speed laser cladding processing head 5. The whole device completes initialization work before cladding.
Carrying out the coating work of preparing the pipe parts by ultra-high-speed laser cladding: the calipers 6 drive the tubular workpiece 7 to start rotating, the exciting device 10 is started, the laser is started, the ultra-high-speed laser cladding processing head 5 starts working, and cladding starts. In the cladding process, the ultrahigh-speed laser cladding processing head 5 starts processing according to a preset speed and a preset route, and meanwhile, the excitation device 10 keeps position synchronization along with the ultrahigh-speed laser cladding processing head 5.
Finishing cladding: and (3) turning off the laser, stopping the operation of the ultrahigh-speed laser cladding processing head 5, resetting the excitation device 10, resetting the scissor type lifting mechanism 8, withdrawing the telescopic bracket 13, resetting the device to zero, pushing out the tailstock 2 of the machine tool together with the whole device, and taking down the tubular workpiece 7.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (8)

1. A device for magnetic field assisted ultrahigh-speed laser cladding of pipe coatings is characterized by comprising an excitation device (10), a linear motor, a scissor-type lifting mechanism (8), a support bracket (12), a sensor (15) and a control unit;
the support bracket (12) is used for being arranged in a tubular workpiece (7) to be processed, and the tubular workpiece (7) is arranged on the machine tool (1); one end of the supporting bracket (12) is connected with the tailstock (2) of the machine tool, and the other end of the supporting bracket is contacted with the top (3) of the machine tool; a support sliding block (17) is arranged on a first sliding rail (21) of the supporting support (12), the support sliding block (17) is connected with a screw nut (18), one end of a screw (19) penetrates through the screw nut (18) and is installed on a bearing support of the supporting support (12), and the other end of the screw is connected with the stepping motor (11);
the shearing fork type lifting mechanism (8) is arranged in a tubular workpiece (7) to be processed, the excitation device (10) is located right below the ultra-high-speed laser cladding processing head (5), the excitation device (10) is arranged on a second base plate (14), the second base plate (14) is arranged on a linear motor rotor (23), the linear motor rotor (23) is connected with a second sliding rail (22) on a stator (16) of the linear motor, and the stator (16) is arranged on a first base plate (9); the first bottom plate (9) is connected with the upper end of the scissor type lifting mechanism (8), one side of the lower end of the scissor type lifting mechanism (8) is connected with the support sliding block (17), and the other side of the lower end of the scissor type lifting mechanism is connected with the bearing seat on the support (12);
the sensor (15) is used for detecting a distance signal between the excitation device (10) and the inner wall of the tubular workpiece (7) above the excitation device; the control unit is respectively connected with the linear motor, the stepping motor (11) and the sensor (15).
2. The apparatus for magnetic field assisted ultra high speed laser cladding of pipe like coatings of claim 1, characterized in that the ultra high speed laser cladding process head (5) is mounted on the machine tool (1) by a laser head moving support (4).
3. The device for magnetic field assisted ultrahigh-speed laser cladding of pipe coatings according to claim 1, wherein the other end of the supporting bracket (12) is in contact with a machine tool tip (3) through a telescopic bracket (13), and the telescopic bracket (13) is connected with a driving device.
4. The apparatus of claim 3, wherein the driving device is an electric driving device; the driving device is connected with the control unit.
5. The device for magnetic field assisted ultrahigh-speed laser cladding of pipe coatings according to claim 1, wherein the scissor-type lifting mechanism (8) comprises two pairs of connecting rods, the two pairs of connecting rods are arranged in a crossed manner, the middles of the connecting rods are connected through pins, the upper ends of the connecting rods are respectively connected with the first bottom plate (9), the lower end of one connecting rod is connected with a bearing seat on the support sliding block (17), and the lower end of the other connecting rod is connected with a bearing seat on the support (12).
6. The apparatus for magnetic field assisted ultra high speed laser cladding of pipe like coatings according to claim 1, characterized in that one end of the pipe like workpiece (7) is mounted on the machine tool (1) by means of a caliper (6).
7. A method for the magnetic field assisted ultra high speed laser cladding of tube like coatings according to any of claims 1-6, characterized by the following steps:
mounting a tubular workpiece (7) to be machined on the machine tool (1);
adjusting the position of the tailstock (2) of the machine tool to enable the excitation device (10) to be positioned right below the position where cladding starts;
the stepping motor (11) works to drive the scissor type lifting mechanism (8) to move, the sensor (15) detects a distance signal between the excitation device (10) and the inner wall of the tubular workpiece (7) above the excitation device and transmits the distance signal to the control unit, and the control unit controls the stepping motor (11) to lift the excitation device (10) to a preset position; the control unit controls the linear motor to enable the speed of movement of the excitation device (10) to be the same as that of the ultra-high-speed laser cladding processing head (5); the excitation device (10) is started to generate a steady magnetic field, the ultra-high-speed laser cladding processing head (5) starts to work, and cladding starts.
8. The method for the apparatus for magnetic field assisted ultra high speed laser cladding of tube like coatings according to claim 7, further comprising the steps of:
the control unit controls the driving device to enable the telescopic support (13) to be telescopic so as to adapt to machining of the tubular workpieces (7) with different lengths.
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