CN212476887U - Detachable multi-shaft ultrahigh-speed laser cladding nozzle - Google Patents
Detachable multi-shaft ultrahigh-speed laser cladding nozzle Download PDFInfo
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- CN212476887U CN212476887U CN202021497550.6U CN202021497550U CN212476887U CN 212476887 U CN212476887 U CN 212476887U CN 202021497550 U CN202021497550 U CN 202021497550U CN 212476887 U CN212476887 U CN 212476887U
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Abstract
The utility model discloses a detachable multi-shaft ultra-high-speed laser cladding nozzle, the lower end of a second module and the upper end of a third module are detachably connected, the upper end of the second module is detachably connected with a plurality of first modules, the upper end of the second module is provided with a connector at the position of the axis of the second module, the connector, the second module and the third module are provided with laser light channels at the position of the axis, and the connector is sleeved with a connector which can adjust the position up and down; powder feeding channels are formed in the axis of the first module, the second module and the third module and form a Laval powder feeding channel, the axes of all the Laval powder feeding channels and the axes of the second module form preset included angles, and the axes of the Laval powder feeding channels and the axes of the laser light channel channels intersect at one point below the third module; and a cooling water inlet and a cooling water outlet are arranged on the second module, and a cooling water channel is arranged in the second module. The utility model discloses a but the split makes things convenient for the washing and the inspection of shower nozzle, also is convenient for to the part quick replacement of wearing and tearing or damage in the shower nozzle.
Description
Technical Field
The utility model relates to a laser beam machining field, specificly relate to a but multiaxis hypervelocity laser cladding shower nozzle of split.
Background
The laser cladding technology is a new material surface repairing treatment technology, the laser cladding technology is characterized in that an alloy powder coating is instantly melted on the surface of a matrix by using a high-energy laser beam emitted by a laser to form metallurgical bonding, and a coating with good mechanical property is prepared by cladding a suitable material on different matrix materials by adopting suitable laser process parameters, so that the properties of the surface of the matrix material, such as hardness, corrosion resistance, oxidation resistance, wear resistance, friction reduction and the like, are improved. So as to achieve the purpose of strengthening and modifying the surface of the metal workpiece. The laser cladding technology has the characteristics of low dilution rate, small heat affected zone, capability of realizing metallurgical bonding and the like, and particularly, large shaft parts and flat plate parts in the industries of coal mines, cement and the like have the defects that the parts are invalid due to the phenomena of scratching, abrasion, corrosion and the like easily occurring on equipment due to the severe and complex working environment. The laser cladding can repair and remanufacture the surface of the part, and meets the urgent needs of coal mine machinery.
The ultrahigh-speed laser cladding technology changes the action process of laser and powder, and ultrahigh-speed acceleration is carried out on powder particles in the cladding process. The surface of the cladding layer subjected to ultrahigh-speed laser cladding has good finish, the lapping trace is not obvious, the cladding layer and the substrate are metallurgically bonded and have no defect, the cladding layer can be directly processed, the material is saved, and the cost is reduced.
Most of ultrahigh-speed laser cladding powder feeding devices are improved from traditional laser cladding powder feeding devices, most of the ultrahigh-speed laser cladding powder feeding devices are straight-tube coaxial powder feeding devices, and due to the fact that powder feeding channels are long and small in size, powder blocking, unsmooth and uneven powder feeding, poor powder particle acceleration effect and multiple coating defects are easily caused. Meanwhile, the powder feeding channel has smaller size, the cladding nozzle has higher processing requirement, the processing difficulty is high in the manufacturing process, the rejection rate is higher, and the manufacturing cost is increased; in addition, in the using process, the powder blocking phenomenon is easy to occur, the powder feeding channel is not easy to disassemble, assemble, inspect and clean, the powder feeding channel is seriously abraded in the using process, and once the powder feeding channel is damaged and divided, the manufacturing spray head needs to be replaced again, so that the resources are wasted, and the cost is increased.
SUMMERY OF THE UTILITY MODEL
For overcoming the problem that exists among the above-mentioned prior art, the utility model provides a but multiaxis hypervelocity laser cladding shower nozzle of split, the utility model discloses a but multiaxis hypervelocity laser cladding shower nozzle of split is removable fraction, makes things convenient for the washing and the inspection of shower nozzle, also is convenient for to the part quick replacement of wearing and tearing or damage in the shower nozzle.
The utility model adopts the technical scheme as follows:
a detachable multi-shaft ultra-high-speed laser cladding nozzle comprises a first module, a second module and a third module, wherein the first module, the second module and the third module are all revolving bodies, the second module and the third module are coaxially arranged, the lower end of the second module is detachably connected with the upper end of the third module, the upper end of the second module is detachably connected with a plurality of first modules, and the first modules are symmetrically distributed around the axis of the second module; the upper end of the second module is provided with a connector at the position of the axis of the second module, the connector, the second module and the third module are provided with laser light paths at the position of the axis, the connector is sleeved with a connector with the position adjustable up and down, and the connector is used for being connected with a laser light path system; powder feeding channels are formed in the axis of the first module, the second module and the third module, the powder feeding channels in the first module, the second module and the third module form a Laval powder feeding channel, the axes of all the Laval powder feeding channels and the axes of the second module form preset included angles, and the axes of all the Laval powder feeding channels and the axes of the laser light channel intersect at one point below the third module; and a cooling water inlet and a cooling water outlet are formed in the second module, a cooling water channel is arranged in the second module, and two ends of the cooling water channel are respectively communicated with the cooling water inlet and the cooling water outlet.
Preferably, the connector is of a cylindrical structure and is sleeved on the connecting head, the side wall of the connector is in threaded connection with an adjusting bolt, and the adjusting bolt penetrates through the side wall of the connector.
Preferably, the connector is provided with a shielding gas inlet which is communicated with the laser light path channel.
Preferably, one end of the first module is provided with a first threaded hole in the axis of the first module, the upper end of the powder feeding channel on the second module is provided with a hollow first external threaded section matched with the first threaded hole, and the first module and the second module are in threaded connection through the first threaded hole and the first external threaded section.
Preferably, the powder feeding passage in the first module is a contraction section of the laval powder feeding passage, the inner cavity of the first external thread section is a throat section of the laval powder feeding passage, and the powder feeding passage in the third module is an expansion section of the laval powder feeding passage.
Preferably, a second external thread section is arranged at the axis of the lower end of the second module, the second external thread section is of a hollow structure, an inner cavity of the second external thread section is a laser light path channel, a second threaded hole is arranged at the axis of the upper end of the third module, and the second module and the third module are connected through the external thread section and the second threaded hole.
Preferably, the cooling water channel is located in the region between the laser light channel and the Laval powder feeding channel.
Preferably, the upper end surface of the second module is a convex conical surface, the lower end surface of the second module is a plane, and the side surface of the second module is an end conical surface; the third module is of a circular truncated cone structure, and the upper end face of the third module is a plane.
Preferably, the axes of all the Laval powder feeding channels and the axis of the laser light channel intersect at the vertex of the cone corresponding to the third module.
Preferably, the lower end face of the third module is an inner concave face, and the lower ports of the laser light path channel and all the Laval powder feeding channels are located on the inner concave face.
The utility model discloses following beneficial effect has:
the utility model discloses but first module and the second module of multiaxis hypervelocity laser cladding shower nozzle of split can be dismantled and be connected, and second module and third module can be dismantled and be connected, and the connector, laser light path passageway has been seted up to second module and third module in the axle center position, and the axle center of first module, all seted up in second module and the third module and sent the powder passageway, send the powder passageway to constitute the Laval powder passageway in first module, second module and the third module, can see from this, the utility model discloses but the dismouting can all be random to this three part of detachable multiaxis hypervelocity laser cladding shower nozzle first module, second module and third module, make things convenient for the washing and the inspection of shower nozzle, also be convenient for to the part quick replacement of wearing and tearing or damage in the shower nozzle. Meanwhile, the Laval powder feeding channel is arranged, so that uniform and smooth powder feeding can be ensured, powder blockage is avoided, the acceleration effect of powder particles is obvious, ultrahigh acceleration can be performed on the powder particles, ultrahigh-speed laser cladding is realized, and a high-quality coating which is free of air holes, high in surface smoothness, good in binding force and thick in deposited coating is obtained. The connector which can be adjusted up and down is sleeved on the connecting head, so that the up-and-down installation distance of the detachable multi-shaft ultra-high-speed laser cladding nozzle can be adjusted; the water cooling structure is arranged, so that the whole spray head, particularly the second module, can be cooled by the aid of the cooling water inlet, the cooling water outlet and the cooling water channel, and overheating in the using process is prevented.
Furthermore, the connector is of a cylindrical structure, the side wall of the connector is in threaded connection with an adjusting bolt, and the connector is simple in structure and convenient to adjust.
Furthermore, a protective gas inlet is arranged on the connector and communicated with the laser light channel, protective gas can be introduced into the laser light channel by utilizing the inlet of the protector, and the laser lens can be protected.
Furthermore, first module and second module are through first screw hole and first external screw thread section threaded connection, and the form through threaded connection makes first module and second module be dismantled and be connected more swiftly convenient, the processing of being convenient for moreover.
Furthermore, the second module and the third module are connected with the second threaded hole through the external thread section, and the second module and the third module are more quickly and conveniently detached and connected in a threaded connection mode and are convenient to process.
Furthermore, the cooling water channel is located in the area between the laser light channel and the Laval powder feeding channel, so that the heating area of the whole spray head can be effectively cooled, and the using effect and the service life of the spray head are ensured.
Furthermore, the upper end surface of the second module is a convex conical surface, so that the structural design when the first module is detachably connected with the second module is facilitated, the lower end surface of the second module is a plane, the third module is of a round table structure, and the upper end surface of the third module is a plane, so that the lower end surface of the second module is tightly attached to the upper end surface of the third module, and the powder feeding effect is ensured; and the side of the second module is a conical surface, so that the integral structure formed by connecting the second module and the third module is more attractive.
Furthermore, the axes of all Laval powder feeding channels and the axis of the laser light channel are intersected at the vertex of the cone corresponding to the third module, so that the distance between the contact point of the laser and the powder and the third module is moderate, the lower end face of the third module is seriously ablated due to too close distance, and more heat and more kinetic energy loss of the powder are caused due to too far distance, so that the deposition is not facilitated.
Furthermore, the lower end face of the third module is an inner concave face, the lower ports of the laser light path channel and all the Laval powder feeding channels are located on the inner concave face, powder can be conveniently bound by the inner concave face, and powder sent out from the powder feeding pipeline can be prevented from scattering at the outlet.
Drawings
FIG. 1 is an overall appearance diagram of the detachable multi-axis ultra-high speed laser cladding nozzle of the present invention;
FIG. 2 is a schematic diagram of a second module of the present invention;
FIG. 3 is a view showing the appearance of the detachable multi-axis ultra-high speed laser cladding nozzle cooling channel of the present invention;
fig. 4 is a structural diagram of a first module of the present invention;
fig. 5 is a topographical view of a second module of the present invention;
fig. 6 is a longitudinal section of a second module of the invention;
fig. 7 is a longitudinal section of a third module of the invention;
FIG. 8 is a schematic structural view of a powder feeding channel of the middle Laval apparatus of the present invention;
FIG. 9 is a conventional laser cladding coating microstructure;
fig. 10 shows a coating microstructure obtained by using the detachable multi-axis ultra-high speed laser cladding nozzle of the present invention.
In the figure, 1, a laser light path channel; 1-1, a connector; 2. adjusting the bolt; 3. a shielding gas inlet; 4. a first module; 5. a cooling water inlet; 6. a connector; 7. a first powder feeding channel; 8. a second powder feeding channel; 9. a third powder feeding channel; 10. a second module; 11. a second outer thread section; 12. a third module; 13. an expansion section; 14. a convergence point; 15. a contraction section; 16. a first external thread section; 17. an expansion section; 18. a cooling water outlet; 19. a second threaded hole; 20. a cooling water crossover point; 21. a first threaded hole; 22. a cooling water passage.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings so that those skilled in the art can more clearly understand the present invention, but the protection scope of the present invention is not limited thereby
Referring to fig. 1-7, the detachable multi-axis ultra-high speed laser cladding nozzle of the present invention comprises a first module 4, a second module 10 and a third module 12, wherein the first module 4, the second module 10 and the third module 12 are all revolved bodies, the second module 10 and the third module 12 are coaxially disposed, the lower end of the second module 10 is detachably connected with the upper end of the third module 12, the upper end of the second module 10 is detachably connected with a plurality of first modules 4, and the first modules 4 are symmetrically distributed about the axis of the second module 10; the upper end of the second module 10 is provided with a connector 6 at the position of the axis, the connector 6, the second module 10 and the third module 12 are provided with a laser light path channel 1 at the position of the axis, the connector 6 is sleeved with a connector 1-1 with the position capable of being adjusted up and down, and the connector 1-1 is used for being connected with a laser light path system; powder feeding channels are formed in the axis of the first module 4, the second module 10 and the third module 12, the powder feeding channels in the first module 4, the second module 10 and the third module 12 form a Laval powder feeding channel, the axes of all the Laval powder feeding channels and the axis of the second module 10 form preset included angles, and the axes of all the Laval powder feeding channels and the axis of the laser light channel 1 intersect at one point below the third module 12; the second module 10 is provided with a cooling water inlet 5 and a cooling water outlet 18, a cooling water channel 22 is arranged inside the second module 10, and two ends of the cooling water channel are respectively communicated with the cooling water inlet 5 and the cooling water outlet 18.
Referring to fig. 1, 5 and 6, the connector 1-1 is a cylindrical structure and is sleeved on the connecting head 6, the side wall of the connector 1-1 is in threaded connection with the adjusting bolt 2, and the adjusting bolt 2 penetrates through the side wall of the connector 1-1.
Referring to fig. 1 and 5, a shielding gas inlet 3 is provided on the connector 1-1, and the shielding gas inlet 3 communicates with the laser light path 1.
As a preferred embodiment of the present invention, referring to fig. 1 to 6, one end of the first module 4 is provided with a first threaded hole 21 at the axis of the first module 4, the upper end of the powder feeding channel on the second module 10 is provided with a hollow first external threaded section 16 adapted to the first threaded hole 21, and the first module 4 and the second module 10 are connected by the first threaded hole 21 and the first external threaded section 16.
Referring to fig. 2, 4, 6-8, the powder feeding passage in the first module 4 is a contraction section 15 of the laval powder feeding passage, the inner cavity of the first external thread section 16 is a throat part of the laval powder feeding passage, and the powder feeding passage in the third module 12 is an expansion section of the laval powder feeding passage.
As a preferred embodiment of the present invention, referring to fig. 1, fig. 2, fig. 5-fig. 7, the second external thread section 11 is disposed at the axis of the lower end of the second module 10, the second external thread section 11 is a hollow structure, the inner cavity of the second external thread section 11 is a laser light path channel, the axis of the upper end of the third module 12 is disposed with a second threaded hole 19, and the second module 10 and the third module 12 are connected through the external thread section 11 and the second threaded hole 19.
Referring to fig. 2, 3 and 6, as a preferred embodiment of the present invention, the cooling water passage 22 is located in the region between the laser light passage 1 and the laval powder feeding passage.
As a preferred embodiment of the present invention, referring to fig. 1-3 and 5-7, the upper end surface of the second module 10 is a convex conical surface, the lower end surface of the second module 10 is a plane, and the side surface of the second module 10 is a one-end conical surface; the third module 12 is in a circular truncated cone structure, and the upper end surface of the third module 12 is a plane.
Referring to fig. 7, the axes of all the laval powder feeding channels and the axis of the laser light path channel 1 intersect at the vertex of the cone corresponding to the third module 12.
As a preferred embodiment of the present invention, referring to fig. 7, the lower end face of the third module 12 is an inner concave surface, and the laser light path channel 1 and the lower ports of all the laval powder feeding channels are located on the inner concave surface.
Use the utility model discloses but multiaxis hypervelocity laser cladding shower nozzle of split carries out the specific step of laser cladding and includes:
(1) checking whether the laser generator, the water cooler, the powder feeder and the light path system are normal;
(2) assembling each part of the detachable multi-shaft ultra-high-speed laser cladding nozzle, then installing the whole nozzle on the optical path system and adjusting the fixed position;
(3) polishing the surface of a substrate of a workpiece to be processed by using abrasive paper, cleaning the substrate by using alcohol, and fixing the substrate on a workbench;
(4) selecting proper metal powder as ultrahigh-speed laser cladding material powder, drying and assembling the powder in a designated powder feeder container;
(5) adjusting the power of the laser output by the laser generator to 0.3-5Kw, and adjusting the diameter of a light beam spot of the light path system to 0.5-5 mm;
(6) adjusting the distance between the workpiece to be processed and the laser nozzle to be 5-30 mm;
(7) adjusting the powder feeding amount of the powder feeder according to the requirement;
(8) adjusting the powder feeding speed to 5-300m/s according to the requirement;
(9) opening the water cooler and starting the water cooling system;
(10) starting a powder feeder, so that laser cladding powder is fed to an inlet (namely an upper port) of a first module 4 through a powder feeding air pipe, is contracted through a contraction section, then reaches a throat, is subjected to ultrahigh acceleration to an expansion section through the throat, is converged at a laser powder convergence point formed by the powder and laser beams emitted by a laser cavity at a position 0.1-10mm above the surface of a substrate, forms a molten pool on the surface of the substrate of a workpiece to be processed under the action of laser energy, and forms a deposition layer or a block material after being rapidly cooled;
(11) and after the laser deposition is finished, closing all the devices, taking down the machined part, and performing later-stage machining.
The above description is only for the preferred embodiment of the present invention, and the technical solution of the present invention is not limited thereto, and any known modifications made by those skilled in the art on the basis of the main technical idea of the present invention belong to the technical scope to be protected by the present invention, and the specific protection scope of the present invention is subject to the description of the claims. The present invention will be described in further detail with reference to examples.
1. The embodiment is that laser cladding is carried out to the surface base member of colliery hydraulic support hydro-cylinder piston rod, and the diameter of piston rod is 70mm, and cladding region length is 60mm, and the material of piston rod is 27 SiMn. Polishing the surface of the piston rod by using abrasive paper, cleaning the piston rod by using alcohol, and fixing the piston rod on a lathe;
2. in the embodiment, the laser generator adopts a 2000W optical fiber output semiconductor laser of Wuhan Ruiki optical fiber laser technology GmbH, the laser power is 1800W, the laser wavelength is 1064nm, and the light path system is adjusted to enable the spot size formed by the laser beam on the surface of the piston rod to be phi 3 mm;
3. selecting imported iron-based laser cladding powder of 100-300 meshes, and putting the powder into a container of a powder feeder;
4. adjusting the laser beam to be vertical to the surface of the outer circle of the piston rod, enabling the surface distance between the laser nozzle and the piston rod to be 15mm, and adjusting the moving speed range of the laser deposition nozzle to be 25 mm/s;
5. setting a cladding path as left-to-right spiral cladding.
6. And starting a water cooler, a powder feeder and a laser, starting a set cladding path, and accelerating laser cladding powder to reach ultrahigh speed through a Laval powder feeding channel.
7. And completing laser cladding of the wire material on the surface of the piston rod after the cladding is not long.
According to the scheme of the embodiment, the thickness of the cladding layer obtained on the piston rod is 1.2mm, the obtained cladding layer is flat and smooth, the microstructure is observed through cladding layer component determination and sampling, the interior of the cladding layer is compact and free of defects, and a coating interface obtained by a traditional laser cladding nozzle has obvious cracks as shown in figure 9; and the utility model discloses the cladding coating that obtains, cladding layer and base member are metallurgical combination, and crackle and other defects do not appear in interface department, combine better like figure 10, satisfy hydraulic support hydro-cylinder piston rod completely after the processing and use.
Claims (10)
1. A detachable multi-shaft ultra-high-speed laser cladding nozzle is characterized by comprising a first module (4), a second module (10) and a third module (12), wherein the first module (4), the second module (10) and the third module (12) are all revolving bodies, the second module (10) and the third module (12) are coaxially arranged, the lower end of the second module (10) is detachably connected with the upper end of the third module (12), the upper end of the second module (10) is detachably connected with a plurality of first modules (4), and the first modules (4) are symmetrically distributed about the axis of the second module (10); the upper end of the second module (10) is provided with a connector (6) at the position of the axis, the connector (6), the second module (10) and the third module (12) are provided with a laser light path channel (1) at the position of the axis, the connector (6) is sleeved with a connector (1-1) with the position capable of being adjusted up and down, and the connector (1-1) is used for being connected with a laser light path system; powder feeding channels are formed in the axis of the first module (4), the second module (10) and the third module (12), the powder feeding channels in the first module (4), the second module (10) and the third module (12) form a Laval powder feeding channel, the axes of all the Laval powder feeding channels and the axis of the second module (10) form preset included angles, and the axes of all the Laval powder feeding channels and the axis of the laser light channel (1) are intersected at one point below the third module (12); the second module (10) is provided with a cooling water inlet (5) and a cooling water outlet (18), a cooling water channel (22) is arranged inside the second module (10), and two ends of the cooling water channel are respectively communicated with the cooling water inlet (5) and the cooling water outlet (18).
2. A detachable multi-shaft ultra-high speed laser cladding nozzle according to claim 1, wherein the connector (1-1) is cylindrical and sleeved on the connector (6), the side wall of the connector (1-1) is in threaded connection with the adjusting bolt (2), and the adjusting bolt (2) penetrates through the side wall of the connector (1-1).
3. A detachable multi-shaft ultra-high-speed laser cladding nozzle according to claim 1 or 2, characterized in that a shielding gas inlet (3) is arranged on the connector (1-1), and the shielding gas inlet (3) is communicated with the laser light channel (1).
4. A detachable multi-axis ultra high speed laser cladding nozzle according to claim 1, wherein one end of the first module (4) is provided with a first threaded hole (21) at the axis of the first module (4), the upper end of the powder feeding channel on the second module (10) is provided with a first hollow external threaded section (16) matched with the first threaded hole (21), and the first module (4) and the second module (10) are in threaded connection through the first threaded hole (21) and the first external threaded section (16).
5. A detachable multi-axis ultra high speed laser cladding nozzle according to claim 4, wherein the powder feeding channel in the first module (4) is a contraction section (15) of a Laval powder feeding channel, the inner cavity of the first external thread section (16) is a throat part of the Laval powder feeding channel, and the powder feeding channel in the third module (12) is an expansion section of the Laval powder feeding channel.
6. A detachable multi-axis ultra-high speed laser cladding nozzle according to claim 1, wherein a second external thread section (11) is arranged at an axis of a lower end of the second module (10), the second external thread section (11) is of a hollow structure, an inner cavity of the second external thread section (11) is a laser light path channel, a second threaded hole (19) is arranged at an axis of an upper end of the third module (12), and the second module (10) and the third module (12) are connected through the external thread section (11) and the second threaded hole (19).
7. A detachable multi-axis ultra high speed laser cladding nozzle according to claim 1, wherein the cooling water channel (22) is located in the area between the laser light channel (1) and the Laval powder feeding channel.
8. The detachable multi-axis ultra-high speed laser cladding nozzle according to claim 1, wherein the upper end surface of the second module (10) is a convex conical surface, the lower end surface of the second module (10) is a plane, and the side surface of the second module (10) is an end conical surface; the third module (12) is in a circular truncated cone structure, and the upper end face of the third module (12) is a plane.
9. A detachable multi-axis ultra-high speed laser cladding nozzle according to claim 1, wherein the axes of all Laval powder feeding channels and the axis of the laser light channel (1) intersect at the vertex of the corresponding cone of the third module (12).
10. A detachable multi-axis ultra high speed laser cladding nozzle according to claim 1, wherein the lower end face of the third module (12) is a concave face, and the laser light path channel (1) and the lower ports of all Laval powder feeding channels are located on the concave face.
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| CN202021497550.6U CN212476887U (en) | 2020-07-24 | 2020-07-24 | Detachable multi-shaft ultrahigh-speed laser cladding nozzle |
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| CN202021497550.6U CN212476887U (en) | 2020-07-24 | 2020-07-24 | Detachable multi-shaft ultrahigh-speed laser cladding nozzle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111850547A (en) * | 2020-07-24 | 2020-10-30 | 西安建筑科技大学 | Multi-shaft ultrahigh-speed laser cladding nozzle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111850547A (en) * | 2020-07-24 | 2020-10-30 | 西安建筑科技大学 | Multi-shaft ultrahigh-speed laser cladding nozzle |
| CN111850547B (en) * | 2020-07-24 | 2024-04-12 | 西安建筑科技大学 | Multi-shaft ultra-high-speed laser cladding spray head |
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