CN102925888B - Aluminum alloy cold spraying device and method for magnesium alloy hub - Google Patents

Aluminum alloy cold spraying device and method for magnesium alloy hub Download PDF

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CN102925888B
CN102925888B CN201210392236.5A CN201210392236A CN102925888B CN 102925888 B CN102925888 B CN 102925888B CN 201210392236 A CN201210392236 A CN 201210392236A CN 102925888 B CN102925888 B CN 102925888B
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wheel hub
shower nozzle
hub
alloy
contact roller
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CN102925888A (en
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刘绍东
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刘绍东
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Abstract

The invention discloses an aluminum alloy cold spraying device and method for a magnesium alloy hub. The device comprises a rack and a hub drive mechanism arranged on the rack, wherein the hub drive mechanism is provided with a rotation shaft for fixing the hub; a hub heating device is arranged on one side of the rotation shaft; the rack is also provided with a spray head for the cod spraying of aluminum alloy on the hub; the spray head is connected with a spray head spraying control device for controlling the flow and the spraying speed; the aluminum alloy cold spraying device for a magnesium alloy hub also comprises a controller; and the controller is connected with and controls the hub drive mechanism, the hub heating device and the spray head spraying control device. Through the invention, the problems that the magnesium alloy hub in the prior art has a thin coating and the aluminum alloy coating in the prior art has high porosity and short service life are solved; the structure provided by the invention has thick coating, low coating porosity, high corrosion resistance and long service life; and the surface of the magnesium alloy hub has the corrosion resistance of an aluminum alloy hub.

Description

The device and method of the cold aluminium-plated alloy of magnesium alloy hub
Technical field
The present invention relates to the surface spraying aseptic technic field of metallic substance, particularly the device and method of the cold aluminium-plated alloy of a kind of magnesium alloy hub.
Background technology
China has become World Auto Industry big producing country, and 2011 annual production reach 1,800 ten thousand, for save energy, reduces exhaust gas emission, and automotive industry will develop must realize lightweight.Magnesium alloy is the lighter a kind of structured material of proportion in known metal material, lighter by 3/4 than steel, lighter by 1/3 than aluminium, has more application, as bearing circle, dashboard, seat, wheel casing and engine case etc. in automobile component.On moving parts, wheel hub also starts to apply magnesium alloy.As the wheel hub in wheel hub and racing car on aircraft, but the application road conditions of these wheel hubs are better conventionally, and duration of service is shorter.Therefore magnesium alloy hub has general differential arc oxidation, cathode electrophoretic coating, dusts, the surface treatment of baking vanish can meet the demands.But because the alloy ingredient of magnesium alloy hub is more active, after collision scraping, surface oxidation-resistant ability, easily loss.In order to make magnesium alloy hub can adapt to widely vehicle and can travel on more complicated road surface, stand Stone Shock and collision, scraping, several surface treatment methods are all difficult to meet the demands above, because the thickness of magnesium alloy differential arc oxidation is 0.010 to 0.015mm, be unable to undergo complex road surface Stone Shock, scraping, while being also unable to undergo outsize tire installation simultaneously, iron staff prizes, collides.Therefore, adopt the surface treatment of above several magnesium alloy hubs or aseptic technic to be only suitable for wheel and use under the splendid condition of road conditions, be difficult to adapt to the installation requirements of wheel hub, tire of various oversize vehicles and the requirement of travelling and using under complicated road and the poor condition of road conditions.
Cold spray technique is a kind of effective ways that generate thick aluminium plated film on Mg alloy surface, and it is by by aluminum alloy granule high-speed impact base material, and the coating that pure viscous deformation polymerization forms occurs particle, can prevent preferably the electrocorrosion of magnesium alloy materials.But the coating forming after the cold aluminium-plated alloy of the magnesium alloy base material of prior art is thinner, the bonding force between coating and magnesium alloy a little less than.On the other hand, when the cold aluminium-plated alloy of prior art magnesium alloy base material, the sensing of shower nozzle is mostly vertical with spray-coating surface or spraying point, this causes the bonding strength of aluminum alloy granule in the spray-coating surface normal direction direction of spray-coating surface or spraying point (perpendicular to) better, and to be parallel to bonding strength in spray-coating surface or spraying point direction poor, thereby cause the porosity of coating larger, affected work-ing life.Open day is October 17 calendar year 2001, publication number is that the Chinese patent document of CN 2454045Y discloses a kind of supersonic cold-spraying apparatus, the main supersonic cold-spraying apparatus being formed by body, de Laval noz(zle), mixing tank, suction pump line and material feeding box, be carrier by high pressure normal temperature air A, B, injection, mixing and acceleration powder to velocity of sound with on complete material surface modifying.This device utilizes high pressure draft injection coated powder, under the effect of main high-pressure air, through de Laval noz(zle), coated powder is accelerated together, makes coated powder under supersonic speed state, clash into substrate target body, completes at normal temperatures workpiece surface spraying.Open day is on July 4th, 2012, publication number is that the Chinese patent document of CN102527544A discloses a kind of cold spray apparatus and method of preparing metal composite gradient quasi crystal coating, accurate crystalline flour end powder feeder and the metal or alloy powder powder feeder of this device are connected to gas-solid mixing chamber by pipeline respectively, form two channels powder feeding structure, on described pipeline, be respectively equipped with accurate brilliant powder heater and metal or alloy powder heater, gas heater connects gas-solid mixing chamber by pipeline, in the exit of gas-solid mixing chamber, superonic flow nozzzle is set.One of source of the gas pressurized gas enters accurate crystalline flour end powder feeder along separate routes, one enters metal powder feed device along separate routes, one enters well heater along separate routes, gas and powder enter superonic flow nozzzle by gas-solid mixing chamber and form the solid two-phase flow of gas one, solid particulate in the solid two-phase flow of gas one is ejected into workpiece surface, serious viscous deformation occurs and be deposited on workpiece surface.But said structure all exists between coating and base material in conjunction with insecure, the problem that coating is thinner and coating porosity degree is larger.
Summary of the invention
The object of the invention is for solving its coating of magnesium alloy hub of prior art thin, low with base material bonding strength, can not adapt to the problem of travelling under the poor condition of complicated road and road conditions and a kind of thick coating is provided, in conjunction with firmly, make magnesium alloy hub surface possess the device and method of the cold aluminium-plated alloy of magnesium alloy hub of the Anticorrosive Character of aluminium alloy wheel hub.
Second object of the present invention is that the aluminium alloy covered porosity for solving prior art is large, easily be corroded, the problem that work-ing life is short and provide that a kind of coating porosity degree is little, good corrosion resistance, the device and method of the cold aluminium-plated alloy of magnesium alloy hub of long service life.
The present invention for solving the problems of the technologies described above adopted technical scheme is: the device of the cold aluminium-plated alloy of a kind of magnesium alloy hub, comprise frame and be arranged on the wheel hub driving mechanism in frame, described wheel hub driving mechanism is provided with the rotating shaft for stationary hub, one side of rotating shaft is provided with wheel hub heating unit, in frame, be also provided with for the shower nozzle to the cold aluminium-plated alloy of wheel hub, shower nozzle with for controlling its flow, spraying fast shower nozzle spraying control device is connected, the device of the cold aluminium-plated alloy of described magnesium alloy hub also comprises controller, described controller connects and controls wheel hub driving mechanism, wheel hub heating unit and shower nozzle spraying control device.The present invention adopts the cold aluminium-plated powdered alloy of supersonic speed, make magnesium alloy hub surface possess the Anticorrosive Character of aluminium alloy wheel hub, in the cold aluminium-plated powdered alloy process of magnesium alloy hub outside surface, adopt wheel hub wheelwork and wheel hub appearance thermostatically-controlled equipment, can make the temperature on magnesium alloy hub surface and the temperature of cold aluminium-plated powdered alloy match, make the Al alloy powder on magnesium alloy hub surface accept more even, in conjunction with more firm, plyability is better, thereby effectively improves Al alloy powder thicknesses of layers and uniformity coefficient.Improve 10-35 doubly than the superficial film thickness of the magnesium alloy hub of not heating, become an interior magnesium alloy substrate, the automotive hub of outer aluminium alloy protective layer.Its coating of magnesium alloy hub that has solved prior art is thin, can not adapt to the problem of travelling under the poor condition of complicated road and road conditions.
As preferably, in frame, be also provided with the nozzle position control device for controlling nozzle position, nozzle position control device is connected with described controller, the central axis of described shower nozzle is positioned in the plane at spraying point normal and spraying dotted line velocity reversal line place, when shower nozzle work, the angle between the central axis of shower nozzle and spraying dotted line velocity reversal line is 35 to 55 degree.When the cold aluminium-plated alloy of prior art magnesium alloy base material, the sensing of shower nozzle is mostly vertical with spray-coating surface or spraying point, this causes the bonding strength of aluminum alloy granule in the spray-coating surface normal direction direction of spray-coating surface or spraying point (perpendicular to) better, and to be parallel to bonding strength in spray-coating surface or spraying point direction poor, thereby cause the porosity of coating larger, affected work-ing life.Although in the prior art, shower nozzle is also likely at a certain angle with spray-coating surface or spraying point shape in spraying process, and this angle is irregular, and what effect the porosity of the bonding force to raising coating and reduction coating does not have.And the central axis of shower nozzle of the present invention is positioned in the plane at spraying point normal and spraying dotted line velocity reversal line place, when shower nozzle work, the angle between the central axis of shower nozzle and spraying dotted line velocity reversal line is 35 to 55 degree.Unlike the prior art, and first the present invention utilizes wheel hub to rotate this feature, by shower nozzle towards the linear velocity direction of spraying point and and the linear velocity directional ray that rotates of spraying point between form the angle of 35 to 55 degree, when wheel hub rotates, the angle between the central axis of shower nozzle and spraying dotted line velocity reversal line remains unchanged.Spraying point described here, refers to the fritter spraying area that shower nozzle is just right; Spray-coating surface described here, refers to the summation of above-mentioned spraying point, and in addition, it is all two dimensional structure that fritter spraying area can be regarded as, and spray-coating surface can be two dimensional structure, can be also curved-surface structure.Like this, the Al alloy powder of shower nozzle ejection and the spray-coating surface of rotation clash, the angle of 35 to 55 degree has been taken into account aluminum alloy granule in the bonding strength spraying in the linear velocity direction of putting the bonding strength in normal direction and being parallel to this spraying point, especially strengthened the extruding accumulation that coating laterally (is parallel to the linear velocity direction of spraying point), because aluminum alloy granule is vertical, on horizontal both direction, be all subject to enough extruding, therefore not only improved the bonding strength of aluminium alloy covered, can also reduce significantly the porosity of coating, improve the density of coating.Therefore, the aluminium alloy covered porosity that the invention solves prior art is large, is easily corroded, thereby causes short problem in work-ing life.
As preferably, wheel hub heating unit comprise one can holding portion wheel hub heating chamber, the Heating temperature of described wheel hub heating unit is 70 to 220 degrees Celsius, the Heating temperature of wheel hub heating unit is consistent with the temperature of the cold aluminium-plated powdered alloy of shower nozzle.Heating unit by the temperature of wheel hub be heated to shower nozzle the temperature of aluminium-plated powdered alloy consistent, be conducive to improve the firmness that coating is combined with base material, especially, when just starting to spray, the temperature head of Al alloy powder and wheel hub (temperature of Al alloy powder is higher than wheel hub conventionally) will affect the firmness of both combinations.
As preferably, in frame, be also provided with spray-coating surface hold-down gear, described hold-down gear comprises and the spray-coating surface contact roller contacting that rolls, and the seal face of contact roller and the spray-coating surface of wheel hub are suitable, and the seal face of contact roller is 0.3 to 0.8MPa to the pressure mean value of wheel hub.The aluminium alloy covered that viscous deformation is occurred clashing into hold-down gear pushes, and can improve the density of coating, reduces the porosity of coating, improves the preservative effect of magnesium alloy hub.
As preferably, spray-coating surface hold-down gear comprises contact roller heating unit, and the Heating temperature of contact roller heating unit is consistent with the temperature of the cold aluminium-plated powdered alloy of shower nozzle.The effect of contact roller heating unit and wheel hub of the present invention heating are basically identical, can improve the density of coating, reduce the porosity of coating, improve the preservative effect of magnesium alloy hub.
As preferably, spray-coating surface hold-down gear comprises contact roller vibrating device, and the vibrational frequency of contact roller vibrating device is 50 to 100 hertz, and described vibrating device is connected with the drive shaft of contact roller by spring.Vibrating device is set on contact roller, contact roller is applied the vibration of certain frequency in contact roller extrusion coating, this vibration by a small margin has shock action to coating, can further improve the density of coating, reduce the porosity of coating, improve the preservative effect of magnesium alloy hub.
As preferably, shower nozzle is one or several, and the rotating shaft rotating speed on wheel hub driving mechanism is 60 to 120 rpms.Multiple shower nozzles can be set up in parallel to accelerate spraying rate, and in addition, also the periphery to wheel hub and end face spray simultaneously.
The spraying method of the device of the cold aluminium-plated alloy of a kind of magnesium alloy hub, described wheel hub heating unit comprise one can holding portion wheel hub heating chamber, in described frame, be also provided with the nozzle position control device for controlling nozzle position, nozzle position control device is connected with described controller, the central axis of described shower nozzle is positioned in the plane at spraying point normal and spraying dotted line velocity reversal line place, and described controller connects and controls wheel hub driving mechanism, wheel hub heating unit, shower nozzle spraying control device and nozzle position control device; Comprise the following steps:
A. magnesium alloy hub is fixed in rotating shaft, a side of wheel hub is positioned at the heating chamber on wheel hub heating unit.
B. set rotating shaft rotating speed, wheel hub Heating temperature and shower nozzle working parameter by controller, the rotating speed of rotating shaft is 60 to 120 rpms, the Heating temperature of wheel hub heating unit is 70 to 220 degrees Celsius, shower nozzle working parameter comprises temperature, spray speed and the flow of Al alloy powder, and wherein the temperature of Al alloy powder is consistent with wheel hub Heating temperature.
C. open wheel hub driving mechanism rotating shaft is rotated, open wheel hub heating unit wheel hub is heated.
D. in the time that wheel hub temperature reaches set(ting)value, controller drives shower nozzle to swing by nozzle position control device or is mobile, and making the central axis of shower nozzle and the angle spraying between dotted line velocity reversal line is in the scope of 35 to 55 degree.
E. open shower nozzle, to wheel hub spraying Al alloy powder, continue spraying 3 to 6 seconds, keep wheel hub temperature-resistant with Time Controller by wheel hub heating unit.
F. close shower nozzle, rotating shaft rotates backward, and controller drives shower nozzle to swing by nozzle position control device or be mobile, and making the central axis of shower nozzle and the angle spraying between dotted line velocity reversal line is in the scope of 35 to 55 degree.Unlike the prior art, the present invention adopts alternately spraying of positive and negative both direction layering, can make like this aluminum alloy granule of adjacent coating present cross arrangement, and then improves the density of coating.To the shower nozzle for spraying wheel hub periphery arc surface, the mode that can adopt shower nozzle to swing or to move changes spraying direction and meets the angle requirement of regulation, to the shower nozzle for spraying wheel hub end face (plane), the mode that can adopt shower nozzle to swing changes spraying direction and meets the angle requirement of regulation.
G. repeating step e, f, until the thickness of aluminum alloy on magnesium alloy hub surface reaches pre-provisioning request.
As aforesaid method preferably, frame is provided with spray-coating surface hold-down gear, described spray-coating surface hold-down gear comprises contact roller heating unit, in the time that shower nozzle work sprays Al alloy powder to wheel hub, contact roller on hold-down gear rolls and contacts with spray-coating surface, to wheel hub, pressuring action is played in spraying, the seal face of contact roller is 0.3 to 0.8MPa to the pressure mean value of wheel hub, the Heating temperature of contact roller heating unit is consistent with the temperature of the cold aluminium-plated powdered alloy of shower nozzle, and the temperature of contact roller seal face is consistent with the temperature of the cold aluminium-plated powdered alloy of shower nozzle.
As aforesaid method preferably, spray-coating surface hold-down gear also comprises contact roller vibrating device, described contact roller vibrating device is connected with the drive shaft of contact roller by spring, in the time that spray-coating surface hold-down gear is worked, the work of contact roller vibrating device, the vibrational frequency of contact roller vibrating device is 50 to 100 hertz.
While adopting method of the present invention to the cold aluminium-plated powdered alloy of magnesium alloy hub, its shower nozzle also can adopt hand-held operation.
The invention has the beneficial effects as follows: its coating of magnesium alloy hub that it has solved prior art is effectively thin, low with base material bonding strength, can not adapt to the problem of travelling under the poor condition of complicated road and road conditions, also the coating porosity degree that has solved prior art is large, easily be corroded, the problem that work-ing life is short.The magnesium alloy hub thick coating, the porosity that adopt device and method of the present invention to produce are little, combination is firm, good corrosion resistance, long service life, make magnesium alloy hub surface possess the Anticorrosive Character of aluminium alloy wheel hub, have very high using value.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the device embodiment 1 of the cold aluminium-plated alloy of magnesium alloy hub of the present invention;
Fig. 2 is the another kind of structural representation of the device embodiment 1 of the cold aluminium-plated alloy of magnesium alloy hub of the present invention, does not show side shower nozzle in figure;
Fig. 3 is a kind of structural representation of the device embodiment 2 of the cold aluminium-plated alloy of magnesium alloy hub of the present invention, and the wheel hub in figure turns to contrary with Fig. 2;
Fig. 4 is shower nozzle of the present invention and the position relationship schematic diagram that sprays point;
Fig. 5 is the structural relation schematic diagram of wheel hub of the present invention and aluminum alloy granule;
Fig. 6 is the structural relation schematic diagram of prior art magnesium alloy base material and aluminum alloy granule.
In figure: 1. wheel hub driving mechanism, 2. wheel hub, 3. rotating shaft, 4. wheel hub heating unit, 5. shower nozzle, 6. controller, 7. spraying point, 8. heating chamber, 9. contact roller, 10. contact roller heating unit, 11. contact roller vibrating devices, 12. springs, 13. drive shafts, 14. aluminum alloy granules, 15. heating units.
Embodiment
Below by embodiment, and by reference to the accompanying drawings the embodiment of technical solution of the present invention is further described.
Embodiment 1
In the embodiment 1 as shown in Fig. 1 Fig. 2, the device of the cold aluminium-plated alloy of a kind of magnesium alloy hub, comprise frame and be arranged on the wheel hub driving mechanism 1 in frame, described wheel hub driving mechanism is provided with the rotating shaft 3 for stationary hub 2, the rotating speed of rotating shaft is 60 to 120 rpms, and a side of rotating shaft is provided with wheel hub heating unit 4, wheel hub heating unit comprise one can holding portion wheel hub heating chamber 8, heating chamber is provided with heating unit 15, and the Heating temperature scope of heating chamber is 70 to 220 degrees Celsius.In frame, be also provided with for the shower nozzle 5 to the cold aluminium-plated alloy of wheel hub, shower nozzle is separately positioned on periphery one side of wheel hub and end face one side of wheel hub, shower nozzle with for controlling its flow, spray fast shower nozzle spraying control device and be connected, the device of the cold aluminium-plated alloy of described magnesium alloy hub also comprises controller 6, and described controller connects and controls wheel hub driving mechanism, wheel hub heating unit and shower nozzle spraying control device.In described frame, be also provided with the nozzle position control device for controlling nozzle position, nozzle position control device is connected with described controller, the central axis of described shower nozzle is arranged in the plane at spraying point 7 normals (Fig. 4 n to) and spraying dotted line velocity reversal (Fig. 4 v to) line place, when shower nozzle work, angle (θ angle in Fig. 4) between the central axis of shower nozzle and spraying dotted line velocity reversal line is 35 to 55 degree, is 45 degree in the present embodiment as shown in drawings.
The spraying method of the device of the cold aluminium-plated alloy of magnesium alloy hub, wheel hub heating unit comprise one can holding portion wheel hub heating chamber, in described frame, be also provided with the nozzle position control device for controlling nozzle position, nozzle position control device is connected with described controller, the central axis of described shower nozzle is positioned in the plane at spraying point normal and spraying dotted line velocity reversal line place, and described controller connects and controls wheel hub driving mechanism, wheel hub heating unit, shower nozzle spraying control device and nozzle position control device; Comprise the following steps:
A. magnesium alloy hub is fixed in rotating shaft, a side of wheel hub is positioned at the heating chamber on wheel hub heating unit.
B. set rotating shaft rotating speed, wheel hub Heating temperature and shower nozzle working parameter by controller, the rotating speed of rotating shaft is 60 to 120 rpms, the Heating temperature of wheel hub heating unit is 70 to 220 degrees Celsius, shower nozzle working parameter comprises temperature, spray speed and the flow of Al alloy powder, and wherein the temperature of Al alloy powder is consistent with wheel hub Heating temperature.
C. open wheel hub driving mechanism rotating shaft is rotated, open wheel hub heating unit wheel hub is heated.
D. in the time that wheel hub temperature reaches set(ting)value, controller drives shower nozzle to swing by nozzle position control device or is mobile, and making the central axis of shower nozzle and the angle spraying between dotted line velocity reversal line is in the scope of 35 to 55 degree.
E. open shower nozzle, to wheel hub spraying Al alloy powder, continue spraying 3 to 6 seconds, keep wheel hub temperature-resistant with Time Controller by wheel hub heating unit.
F. close shower nozzle, rotating shaft rotates backward, and controller drives shower nozzle to swing by nozzle position control device or be mobile, and making the central axis of shower nozzle and the angle spraying between dotted line velocity reversal line is in the scope of 35 to 55 degree.The present invention adopts alternately spraying of positive and negative both direction layering, can make like this aluminum alloy granule 14 of adjacent coating present cross arrangement (see figure 4), has significantly differently from the arrangement mode (see figure 5) of conventional spray paint method, can improve the density of coating.
G. repeating step e, f, until the thickness of aluminum alloy on magnesium alloy hub surface reaches pre-provisioning request.
Embodiment 2
In the frame of embodiment 2, be also provided with spray-coating surface hold-down gear (see figure 3), described hold-down gear comprises and the spray-coating surface contact roller 9 contacting that rolls, the seal face of contact roller and the spray-coating surface of wheel hub are suitable, and the seal face of contact roller is 0.3 to 0.8MPa to the pressure mean value of wheel hub.Described spray-coating surface hold-down gear comprises contact roller heating unit 10, the Heating temperature of contact roller heating unit is consistent with the temperature of the cold aluminium-plated powdered alloy of shower nozzle, described spray-coating surface hold-down gear also comprises contact roller vibrating device 11, the vibrational frequency of contact roller vibrating device is 50 to 100 hertz, described contact roller vibrating device is connected with the drive shaft 13 of contact roller by spring 12, and all the other are identical with embodiment 1.
For the embodiment that is provided with spray-coating surface hold-down gear, in frame, be also provided with spray-coating surface hold-down gear, described spray-coating surface hold-down gear also comprises contact roller heating unit, when described shower nozzle work sprays Al alloy powder to wheel hub, contact roller on hold-down gear rolls and contacts with spray-coating surface, the seal face of contact roller is 0.3 to 0.8MPa to the pressure mean value of wheel hub, and the Heating temperature of contact roller heating unit is consistent with the temperature of the cold aluminium-plated powdered alloy of shower nozzle, and all the other are identical with the method for embodiment 1.
For the embodiment that is provided with vibrating device, spray-coating surface hold-down gear comprises contact roller vibrating device, described contact roller vibrating device is connected with the drive shaft of contact roller by spring, when the work of spray-coating surface hold-down gear, the work of contact roller vibrating device, the vibrational frequency of contact roller vibrating device is 50 to 100 hertz, and all the other are identical with the method for embodiment 1.
It should be noted that, the present invention is in the time being provided with contact roller, and contact roller heating unit and contact roller vibrating device can arrange simultaneously or select to arrange, shower nozzle can be also one or more, for faces different on wheel hub, can spray respectively by single shower nozzle, also can spray by multiple shower nozzles simultaneously.In addition, while adopting method of the present invention to the cold aluminium-plated powdered alloy of magnesium alloy hub, its shower nozzle also can adopt hand-held operation.
In addition to the implementation; in claims of the present invention and the disclosed scope of specification sheets; technical characterictic of the present invention or technical data can reselect and combine; method of the present invention also can be according to the change of these technical characterictics or technical data and corresponding adjustment; thereby form new embodiment; it is attainable without carrying out creative work that these are all those skilled in the art, and the embodiment that therefore these the present invention do not describe in detail also should be considered as specific embodiments of the invention and within protection scope of the present invention.

Claims (5)

1. the device of the cold aluminium-plated alloy of magnesium alloy hub, it is characterized in that: comprise frame and be arranged on the wheel hub driving mechanism (1) in frame, described wheel hub driving mechanism is provided with the rotating shaft (3) for stationary hub (2), one side of rotating shaft is provided with wheel hub heating unit (4), described wheel hub heating unit comprise one can holding portion wheel hub heating chamber (8), the Heating temperature of described wheel hub heating unit is 70 to 220 degrees Celsius, and the Heating temperature of wheel hub heating unit is consistent with the temperature of the cold aluminium-plated powdered alloy of shower nozzle; In frame, be also provided with for the shower nozzle to the cold aluminium-plated alloy of wheel hub (5), shower nozzle with for controlling its flow, spray fast shower nozzle spraying control device and be connected, the device of the cold aluminium-plated alloy of described magnesium alloy hub also comprises controller (6), and described controller connects and controls wheel hub driving mechanism, wheel hub heating unit and shower nozzle spraying control device; Frame is provided with the nozzle position control device for controlling nozzle position, nozzle position control device is connected with described controller, the central axis of described shower nozzle is positioned in the plane at spraying point (7) normal and spraying dotted line velocity reversal line place, when shower nozzle work, the angle between the central axis of shower nozzle and spraying dotted line velocity reversal line is 35 to 55 degree; In frame, be also provided with spray-coating surface hold-down gear, described hold-down gear comprises and the spray-coating surface contact roller (9) contacting that rolls, the seal face of contact roller and the spray-coating surface of wheel hub are suitable, the seal face of contact roller is 0.3 to 0.8MPa to the pressure mean value of wheel hub, described spray-coating surface hold-down gear comprises contact roller heating unit (10), and the Heating temperature of contact roller heating unit is consistent with the temperature of the cold aluminium-plated powdered alloy of shower nozzle.
2. the device of the cold aluminium-plated alloy of magnesium alloy hub according to claim 1, it is characterized in that: described spray-coating surface hold-down gear comprises contact roller vibrating device (11), the vibrational frequency of contact roller vibrating device is 50 to 100 hertz, and described contact roller vibrating device is connected with the drive shaft (13) of contact roller by spring (12).
3. the device of the cold aluminium-plated alloy of magnesium alloy hub according to claim 1, is characterized in that: shower nozzle is one or several, and the rotating shaft rotating speed on wheel hub driving mechanism is 60 to 120 rpms.
4. a spraying method for the device of the cold aluminium-plated alloy of magnesium alloy hub according to claim 1, is characterized in that comprising the following steps:
A. magnesium alloy hub is fixed in rotating shaft, a side of wheel hub is positioned at the heating chamber on wheel hub heating unit;
B. set rotating shaft rotating speed, wheel hub Heating temperature and shower nozzle working parameter by controller, the rotating speed of rotating shaft is 60 to 120 rpms, the Heating temperature of wheel hub heating unit is 70 to 220 degrees Celsius, shower nozzle working parameter comprises temperature, spray speed and the flow of Al alloy powder, and wherein the temperature of Al alloy powder is consistent with wheel hub Heating temperature;
C. open wheel hub driving mechanism rotating shaft is rotated, open wheel hub heating unit wheel hub is heated;
D. in the time that wheel hub temperature reaches set(ting)value, controller drives shower nozzle to swing by nozzle position control device or is mobile, and making the central axis of shower nozzle and the angle spraying between dotted line velocity reversal line is in the scope of 35 to 55 degree;
E. open shower nozzle, to wheel hub spraying Al alloy powder, continue spraying 3 to 6 seconds, keep wheel hub temperature-resistant with Time Controller by wheel hub heating unit;
When described shower nozzle work sprays Al alloy powder to wheel hub, contact roller on hold-down gear rolls and contacts with spray-coating surface, the seal face of contact roller is 0.3 to 0.8MPa to the pressure mean value of wheel hub, and the Heating temperature of contact roller heating unit is consistent with the temperature of the cold aluminium-plated powdered alloy of shower nozzle;
F. close shower nozzle, rotating shaft rotates backward, and controller drives shower nozzle to swing by nozzle position control device or be mobile, and making the central axis of shower nozzle and the angle spraying between dotted line velocity reversal line is in the scope of 35 to 55 degree;
G. repeating step e, f, until the thickness of aluminum alloy on magnesium alloy hub surface reaches pre-provisioning request.
5. spraying method according to claim 4, it is characterized in that: described spray-coating surface hold-down gear comprises contact roller vibrating device, described contact roller vibrating device is connected with the drive shaft of contact roller by spring, it is characterized in that: when the work of spray-coating surface hold-down gear, the work of contact roller vibrating device, the vibrational frequency of contact roller vibrating device is 50 to 100 hertz.
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US10704845B2 (en) 2018-01-29 2020-07-07 Honeywell International Inc. Heat exchangers, heat exchanger tubes, and additive manufacturing cold spray processes for producing the same

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