CN108165922B - Internal support circulation cooling spraying method and internal support mechanism for large thin-wall platinum rhodium alloy pipe - Google Patents
Internal support circulation cooling spraying method and internal support mechanism for large thin-wall platinum rhodium alloy pipe Download PDFInfo
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- CN108165922B CN108165922B CN201810117720.4A CN201810117720A CN108165922B CN 108165922 B CN108165922 B CN 108165922B CN 201810117720 A CN201810117720 A CN 201810117720A CN 108165922 B CN108165922 B CN 108165922B
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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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
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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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
- C23C4/11—Oxides
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Abstract
The invention relates to an internal support circulation cooling spraying method and an internal support mechanism for a large thin-wall platinum-rhodium alloy pipe, belonging to the field of metal material technology. The automatic plasma spraying device is characterized in that an inner supporting structure is adopted in a workpiece to conduct constraint, the supporting structure and the workpiece are assembled in a sealing mode, a cooling medium is introduced to conduct circulating cooling, infrared rays are used for controlling, and finally automatic plasma spraying of a robot is conducted. The spraying equipment comprises a spraying robot, a plasma spray gun, a platinum-rhodium alloy tube, an infrared thermometer, an inner supporting structure, an adjustable rotating device and a movable bracket; the front end of the spraying robot is connected with a plasma spray gun, and an infrared thermometer is arranged on the plasma spray gun; a platinum-rhodium alloy pipe is arranged right in front of the plasma spray gun, and the inside of the platinum-rhodium alloy pipe is supported by an inner supporting structure; the inner support structure is connected with the movable bracket through an adjustable rotating device. The invention has simple structure and lower cost, and can be widely applied to the plasma spraying process of the thin-wall parts. The invention is not limited to the spraying of platinum-rhodium alloy thin-wall pipes, and can be applied to the spraying of other thin-wall pipes, such as copper alloy, aluminum alloy, magnesium alloy and the like.
Description
Technical Field
The invention relates to an internal support circulation cooling spraying method and an internal support mechanism for a large thin-wall platinum-rhodium alloy pipe, belonging to the field of metal material technology.
Background
The platinum-rhodium alloy has excellent high-temperature structural strength and high chemical stability, so that the platinum-rhodium alloy becomes a common high-temperature structural material in the glass industry. The channel prepared by the platinum-rhodium alloy is a key device for producing TFT-LEDs (thin film transistor liquid crystal displays), the consumption of precious metal (mainly platinum-rhodium alloy) of a single set of device is about 500-800 kg, and the platinum-rhodium alloy generates precious metal loss due to oxidation volatilization and even causes hundreds of millions of device damage due to the special high-temperature environment. In order to reduce the potential risk of oxidation and volatilization of the platinum-rhodium alloy and prolong the service life of equipment, the research shows that the spray coating medium on the surface of the platinum-rhodium alloy can effectively slow down the high-temperature oxidation of the platinum-rhodium alloy.
Al 2 O 3 And ZrO(s) 2 The powder is used as two common spraying medium materials, and the high-temperature oxidation phenomenon of the powder can be obviously reduced by spraying the powder on the surface of the platinum-rhodium alloy through different coating technologies. Because of the use limitation of the thermal spraying technology, particularly the deformation of thin-wall parts after thermal spraying is too large, the high precision requirement of equipment is difficult to ensure, and the application of the coating technology in TFT-LED equipment is seriously affected. In addition, the bonding strength and uniformity of the spray coating are also important influencing factors for the application of the coating technology to the platinum-rhodium alloy material.
Disclosure of Invention
The invention aims to overcome the defects of the prior spraying technology, provides a large-sized thin-wall platinum-rhodium alloy pipe internal support circulation cooling spraying method and an internal support mechanism thereof, adopts internal support constraint and circulation cooling and infrared sensing linkage control thin-wall part plasma spraying deformation technology, and aims to provide an effective method for preventing platinum-rhodium alloy thin-wall pipe plasma spraying deformation control.
According to the technical scheme, the internal support circulation cooling spraying method of the large thin-wall platinum-rhodium alloy pipe is characterized in that an internal support structure is adopted in a workpiece to restrict, the support structure and the workpiece are assembled in a sealing mode, cooling medium is introduced to perform circulation cooling, infrared rays are used for control, and finally automatic plasma spraying of a robot is performed;
the spraying equipment comprises a spraying robot, a plasma spray gun, a platinum-rhodium alloy tube, an infrared thermometer, an inner supporting structure, an adjustable rotating device and a movable bracket; the front end of the spraying robot is connected with a plasma spray gun, and an infrared thermometer is arranged on the plasma spray gun; a platinum-rhodium alloy pipe is arranged right in front of the plasma spray gun, and the inside of the platinum-rhodium alloy pipe is supported by an inner supporting structure; the inner support structure is connected with the movable bracket through an adjustable rotating device.
The method comprises the following specific steps:
(1) Assembling an inner support structure: the device comprises a main support rod, a mechanical jack, a secondary support rod, a plane support plate, a semicircular support rod, a sealing end plate, a sealing end cover, an outer hoop clamping ring, a sealing ring, a cooling medium inlet, a cooling medium outlet, a main support rod connecting shaft and a secondary support rod connecting shaft;
(2) And (3) sealing and assembling: the inner supporting structure assembled in the step (1) is folded to the main supporting rod and the secondary supporting rod through a folding mechanical jack, then the inner supporting structure is arranged in a platinum-rhodium alloy pipe, and the secondary supporting rod is unfolded and fixed through a torsion mechanical jack; the sealing end plate, the sealing ring, the main supporting rod and the secondary supporting rod are connected to the two end sides of the platinum-rhodium alloy pipe through bolts, then the outer hoop clamping ring is clamped on the same plane of the sealing end plate, the sealing end cover is connected to the outer side of the sealing end plate in a sealing mode, so that a recyclable airtight space is formed between the inner supporting structure and the platinum-rhodium alloy pipe, finally the supporting platform is moved to a proper position, and the device is inserted into a connecting notch of the adjustable rotating device and fixed;
(3) And (3) circularly cooling: introducing a cooling medium into the tool obtained in the step (2), wherein the cooling medium enters from a cooling medium inlet, flows in a closed space formed by the inner support structure and the platinum-rhodium alloy tube, and flows out from a cooling medium outlet; controlling the surface temperature of the platinum-rhodium alloy pipe in the spraying process by adjusting the flow of the cooling medium;
(4) Infrared sensing: the spraying temperature is monitored by an infrared thermometer arranged on the plasma spray gun, the flow of the cooling medium and the spraying travelling speed are regulated, and the surface temperature of the workpiece is ensured not to exceed the thermodynamic recrystallization temperature T m ；
(5) Spraying: controlling the spraying robot, the plasma spray gun and the infrared thermometer through the steps, setting plasma equipment parameters according to a spraying medium, and performing plasma spraying on the platinum-rhodium alloy pipe fitting; the infrared sensing temperature is regulated by combining the flow rate of the cooling medium and the travelling speed of the spray gun in the spraying process, and the spraying effect is achieved through multi-pass spraying and measurement and detection of a coating thickness meter.
The cooling medium is water or inert gas.
The spraying robot, the plasma spray gun and the cooling medium flow control device are uniformly connected with a PLC control device.
The rhodium content in the platinum-rhodium alloy tube is 0.1-20% by mass ratio.
The thickness of the tube wall of the platinum-rhodium alloy tube is 0.3-1mm; the section size of the pipe body is 200-680 mm, and the length of the pipe body is less than 6000mm; the section of the pipe body is round, oval, waist round, square or rectangular.
The spraying medium is Al 2 O 3 Powder or ZrO 2 And (5) powder.
The spraying medium is Al 2 O 3 When the powder is sprayed, the spraying current is 550-600A, the spraying voltage is 58-62V, and the spraying speed is 1.1-1.3L/min; the distance between the flame core of the plasma spray gun and the platinum-rhodium alloy tube is 100-120 mm.
The spraying medium is ZrO 2 When the powder is sprayed, the spraying current is 580-680A, the spraying voltage is 64-66V, and the spraying speed is 1.4-1.6L/min; the distance between the flame core of the plasma spray gun and the platinum-rhodium alloy tube is 120-150mm.
The inner supporting mechanism for the inner supporting, circulating, cooling and spraying of the large thin-wall platinum-rhodium alloy pipe comprises an inner supporting structure, an adjustable rotating device and a movable bracket; the inner supporting structure comprises a supporting and adjusting mechanism and an end connecting mechanism, the supporting and adjusting mechanism is used for supporting and adjusting products, and two ends of the supporting and adjusting mechanism are respectively connected with the adjustable rotating device through the end connecting mechanism; the lower end of the adjustable rotating device is supported by a movable bracket.
The inner support structure comprises a main support rod and secondary support rods positioned at two sides of the main support rod; the main supporting rod and the secondary supporting rod are connected through a mechanical jack; and two ends of the main supporting rod are connected with the main supporting rod connecting shaft, and two ends of the secondary supporting rod are connected with the secondary supporting rod connecting shaft.
The main support rod connecting shaft and the secondary support rod connecting shaft are connected with a sealing end plate through sealing rings, and a sealing end cover is arranged on the sealing end plate.
The sealing end plate is connected with the outer hoop clamping ring, and a closed space is formed among the outer hoop clamping ring, the sealing end cover and the sealing end plate; the sealing end plate on one side is provided with a cooling medium inlet, and the sealing end plate on the other side is provided with a cooling medium outlet.
A plurality of plane supporting plates are uniformly distributed on the main supporting rods, and a plurality of semicircular supporting rods are uniformly distributed on the secondary supporting rods.
The adjustable rotating device comprises a double-row deep groove ball bearing, a fixed flange plate, a rotating shaft sleeve and an oil sealing cover;
two sides of the inner supporting structure are respectively connected with an adjustable rotating device; the main support rod connecting shaft is connected with the rotary shaft sleeve, and the rotary shaft sleeve is connected with the fixed flange plate; the inside of the fixed flange is provided with a double-row deep groove ball bearing, and the fixed flange is sealed by an oil sealing cover;
the adjustable rotating device below all is equipped with the movable support, and the movable support includes support body and universal wheel, and the universal wheel sets up in support body below.
The invention obviously improves and improves the spray deformation control, the spray layer density and the thickness uniformity control of a large thin-wall platinum-rhodium alloy pipe, and obviously improves the bonding strength of the spray layer, and is characterized in that an internal support internal circulation cooling spray method is adopted. Wherein the temperature control of the spraying operation area is critical, and the temperature of the spraying operation area is effectively ensured to be less than 300 ℃ through the flow control of a cooling medium and the travelling speed control of a spray gun. In the range of the temperature control of the spraying working area, the shorter the flame center of the spraying gun is from the surface of the workpiece, the slower the travelling track of the spraying gun is, and the larger the surface roughness of the spraying workpiece is, the higher the powder coating rate of the spraying surface is, and the bonding strength and the compactness of the spraying layer are beneficial.
The invention adopts the robot automatic plasma spraying technology on the premise of controlling the spraying deformation, controlling the density and thickness uniformity of the spraying layer and having excellent bonding strength of the spraying layer.
The invention has the beneficial effects that: the invention utilizes the internal support constraint and circulating cooling and infrared sensing linkage control thin-wall part thermal spraying deformation technology, can obviously reduce the thin-wall platinum-rhodium alloy spraying deformation in the plasma spraying process, and has obvious effect on the flatness of the spraying surface. The deformation of the section size of the platinum rhodium alloy flat tube with the thickness of 0.8mm for the waist round shape is controlled from the original deformation of 8-10 mm to the existing deformation of 1-3 mm.
The cyclic cooling spraying method of the invention can obviously improve the utilization rate of the sprayed powder, reduce the spraying temperature of the surface of the workpiece by cyclic cooling, shorten the distance between a spray gun and the workpiece, and improve the speed of spraying particles, compact coating and high bonding strength so as to improve the spraying powder-applying rate.
The invention has simple structure and lower cost, and can be widely applied to the plasma spraying process of the thin-wall parts. The invention is not limited to the spraying of platinum-rhodium alloy thin-wall pipes, and can be applied to the spraying of other thin-wall pipes, such as copper alloy, aluminum alloy, magnesium alloy and the like.
Drawings
FIG. 1 is a schematic illustration of an internal support cycle cooling spray process.
Fig. 2 is a schematic view of an assembly of an inner support structure, an adjustable swivel device and a mobile mount.
Fig. 3 is a front view of the inner support structure, the adjustable swivel device and the mobile branch.
Fig. 4 is a schematic cross-sectional view of an internal support structure.
Fig. 5 is a partial cross-sectional view of a hermetic package of a seal end plate.
Fig. 6 is a cross-sectional view of an adjustable rotation device.
FIG. 7-a is a schematic diagram of a conventional manual plasma spray effect.
FIG. 7-b is a schematic illustration of the spray effect of the present invention.
Reference numerals illustrate: 1. a spraying robot; 2. a plasma torch; 3. a platinum rhodium alloy tube; 4. an infrared thermometer; 5. an inner support structure; 5-1, main supporting rod; 5-2, a mechanical jack; 5-3, secondary support rods; 5-4, a plane supporting plate; 5-5, semicircular support rods; 5-6, sealing end plates; 5-7, sealing the end cover; 5-8, an outer hoop clamping ring; 5-9, sealing ring; 5-10, a cooling medium inlet; 5-11, a cooling medium outlet; 5-12, a main support rod connecting shaft; 5-13, a secondary support rod connecting shaft; 6. an adjustable rotation device; 6-1, a double-row deep groove ball bearing; 6-2, fixing the flange plate; 6-3, rotating the shaft sleeve; 6-4, sealing the oil cover; 7. a movable support; 7-1, a bracket body; 7-2, universal wheels.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention more clear, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the attached drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
The spraying robot in the following examples is a Kawasaki robot RS15X type spraying robot, and the plasma spray gun is a matched spraying gun of the type XM-80SK of plasma spraying equipment.
Example 1 internal support mechanism for internal support circulation cooling spraying of large thin-walled platinum-rhodium alloy tube
Comprises an inner supporting structure 5, an adjustable rotating device 6 and a movable bracket 7; the inner supporting structure 5 comprises a supporting and adjusting mechanism and an end connecting mechanism, the supporting and adjusting mechanism is used for supporting and adjusting products, and two ends of the supporting and adjusting mechanism are respectively connected with the adjustable rotating device 6 through the end connecting mechanism; the lower end of the adjustable rotating device 6 is supported by a movable bracket 7.
The inner support structure 5 comprises a main support rod 5-1 and secondary support rods 5-3 positioned on two sides of the main support rod 5-1; the main supporting rod 5-1 and the secondary supporting rod 5-3 are connected through a mechanical jack 5-2; the two ends of the main supporting rod 5-1 are connected with the main supporting rod connecting shaft 5-12, and the two ends of the secondary supporting rod 5-3 are connected with the secondary supporting rod connecting shaft 5-13.
The main support rod connecting shaft 5-12 and the secondary support rod connecting shaft 5-13 are connected with the sealing end plate 5-6 through sealing rings 5-9, and the sealing end plate 5-6 is provided with a sealing end cover 5-7.
The sealing end plate 5-6 is connected with the outer hoop clamping ring 5-8, and a closed space is formed among the outer hoop clamping ring 5-8, the sealing end cover 5-7 and the sealing end plate 5-6; the sealing end plate 5-6 on one side is provided with a cooling medium inlet 5-10, and the sealing end plate 5-6 on the other side is provided with a cooling medium outlet 5-11.
A plurality of plane support plates 5-4 are uniformly distributed on the main support rod 5-1, and a plurality of semicircular support rods 5-5 are uniformly distributed on the secondary support rods 5-3.
The adjustable rotating device 6 comprises a double-row deep groove ball bearing 6-1, a fixed flange plate 6-2, a rotating shaft sleeve 6-3 and an oil sealing cover 6-4;
the two sides of the inner supporting structure 5 are respectively connected with an adjustable rotating device 6; the main support rod connecting shaft 5-12 is connected with the rotary shaft sleeve 6-3, and the rotary shaft sleeve 6-3 is connected with the fixed flange plate 6-2; the inside of the fixed flange 6-2 is provided with a double-row deep groove ball bearing 6-1, and the fixed flange 6-2 is sealed by an oil sealing cover 6-4;
the adjustable rotating device 6 below all is equipped with movable support 7, and movable support 7 includes support body 7-1 and universal wheel 7-2, and universal wheel 7-2 sets up in support body 7-1 below.
Example 2
The spraying equipment comprises a spraying robot 1, a plasma spray gun 2, a platinum-rhodium alloy tube 3, an infrared thermometer 4, an inner supporting structure 5, an adjustable rotating device 6 and a movable bracket 7; the front end of the spraying robot 1 is connected with a plasma spray gun 2, and an infrared thermometer 4 is arranged on the plasma spray gun 2; a platinum-rhodium alloy pipe 3 is arranged right in front of the plasma spray gun 2, and the inside of the platinum-rhodium alloy pipe 3 is supported by an inner supporting structure 5; the inner support structure 5 is connected to a mobile carriage 7 by means of an adjustable rotation device 6.
The platinum-rhodium 20 alloy waist round flat tube has the wall thickness of 0.8mm, the radius R90 mm, the straight side length L of the section of 400mm and the length of 2000mm. The material of the spray coating: zrO (ZrO) 2 Powder with granularity of 15-40 μm.
Pretreatment: deoiling and cleaning the surface of the target platinum-rhodium alloy tube substrate by using acid, alkali and pure water, then adopting silicon carbide sand to carry out sand blasting until the surface of the substrate is roughened, and carrying out surface cleaning by using a high-pressure air gun and absolute ethyl alcohol after the roughening treatment is finished, wherein the sand blasting parameters are as follows: the granularity is 18-24 meshes; the wind pressure is selected to be 0.6-0.8 MPa; the coarsened platinum-rhodium alloy tube has a surface roughness of 2.5-3.5 mu m.
(1) Inner support structure: the planar support plate 5-4 of the R90 semicircular support plate 5-5 and 3 flat sections 100 is designed, the planar support plate comprises 1845mm main support rods 5-1, 4 sets of mechanical jacks 5-2 with elongation not less than 150mm and a secondary support rod 5-3 part with length 1830mm, the mechanical jacks are used for fixedly supporting a platinum rhodium alloy pipe to form a constraint inner cavity outline dimension structure, the main support rods 5-1 and the secondary support rods 5-3 are simultaneously used as main girder stress bodies to bear the gravity load of a workpiece, an inner support tool and a cooling medium, the design of the support rods requires rectangular steel pipes, and the wall thickness requirement is not less than 2.0mm.
(2) And (3) sealing and assembling: the inner supporting structure 5 designed in the step (2) is respectively and uniformly distributed with the R90 semicircular supporting plates 5-5 and the secondary supporting plates 5-3, and the plane supporting plates 5-4 of the straight section 100 are uniformly distributed with the main supporting rods 5-1; the main supporting rod 5-1 and the secondary supporting rod 5-3 are connected by the folding mechanical jack 5-2 through bolts, and the relative relation is fixed by bolts after the positions of the supporting plate and the mechanical jack 5-2 are determined; contracting the mechanical jack 5-2 to collect the two-wing secondary support rods 5-3 into a whole body with the main support rod 5-1, and further expanding the two-wing secondary support rods 5-3 to support and pre-fix by twisting the screw rod of the mechanical jack 5-2 when the internal support structure 5 is arranged in the platinum-rhodium alloy tube 3; the sealing end plate 5-6, the sealing end cover 5-7, the outer hooping snap ring 5-8 and M sealing rings 5-9,M with different specifications are more than or equal to 3; the sealing end plate 5-6, the sealing ring 5-9, the main supporting rod 5-1 and the secondary supporting rod 5-3 are connected to the end side of the platinum-rhodium alloy pipe by bolts; further clamping the outer clamping ring 5-8 on the same plane as the sealing end plate 5-6; the sealing end cover 5-7 is further connected with the outer side of the sealing end plate 5-6 in a sealing way to form a recyclable airtight space; and finally, moving the supporting platform 7 to a proper position, and inserting the sealing tool carrier into the connecting notch of the adjustable rotating device 6 and fixing the sealing tool carrier by using a fixing pin.
(3) And (3) circularly cooling: and (3) connecting the sealing tool carrier obtained in the step (3) to the cooling medium inlet 5-10 and the cooling medium outlet 5-11, and controlling the surface temperature of a workpiece in the spraying process by adjusting the flow of cooling medium in the cooling medium inlet 5-10 and the cooling medium outlet 5-11 on the sealing end plates 5-6 at the two ends of the tool carrier so as to play a role in rapid cooling in the subsequent process, so that the heat of a spraying working area is rapidly taken away in the plasma spraying process, and the thermal stress deformation of the thin-wall pipe is reduced to the greatest extent. The cooling circulation water pressure is 0.1MPa, and the flow rate is controlled to be 1.0-1.5 mm/s.
(4) Infrared sensing control: the infrared thermometer 4 is connected to the lower part of the plasma spray gun 2, the infrared temperature measurement monitoring point and the spraying flame are adjusted to be focused on the surface of the spraying workpiece together, the temperature of the spraying operation area is monitored in real time through the infrared thermometer 4, and the flow rate and the spraying travelling speed of the circulating cooling medium are adjusted according to the measured temperature, so that the temperature of the spraying operation area is less than 300 ℃.
(5) Spraying: adjusting the platinum-rhodium alloy tube 3 to be sprayed to a proper angle through a rotating device 6, and locking a rotating shaft through a slotted hole of a fixed flange 6-2; the spraying robot controller is manually adjusted to enable the vertical distance between the plasma spray gun 2 and a workpiece to be sprayed to be 130mm, the workpiece to be sprayed adopts 4-area sectional spraying, a spraying track adopts an S-shaped track to move, the single offset distance is set to be 10mm, the initial running speed of the robot is set to be 600mm/S, the spraying turning point deviates from the end side of the workpiece to be sprayed by 20-30 mm, a spraying route is set by the first manual no-load running robot simulation after program editing is finished, continuous no-load simulation track simulation is carried out after the program is confirmed to be correct, and automatic program editing can be finished by program running without errors.
Plasma automatic spraying: and (3) after the step (6) is finished, starting cooling circulating water, and starting plasma spraying equipment and an infrared thermometer (4) after the inside of the workpiece to be sprayed is fully filled with cooling medium. When stable spraying flame appears at the plasma spraying gun mouth, running a robot automatic program, observing the feedback temperature value of the infrared thermometer in real time, properly adjusting the spraying travelling speed through a robot control handle, and setting the initial running speed to be 600mm/s. After the primary spraying is finished, the thickness of different parts of the single spraying layer is measured in real time by a coating thickness meter, and the thickness of the coating layer can reach 0.2-0.3 mm by repeating the process for 5-8 times according to the practical spraying effect. The plasma spraying specific parameter settings in this example are shown in table 1.
Table 1 example plasma spray process parameters
Claims (4)
1. The internal support circulation cooling spraying method for the large thin-wall platinum rhodium alloy pipe is characterized by comprising the following steps of: the inner supporting structure is adopted in the workpiece to carry out constraint, the supporting structure and the workpiece are assembled in a sealing way, a cooling medium is introduced to carry out circulating cooling, the control is carried out through infrared rays, and finally, the automatic plasma spraying of the robot is carried out;
the spraying equipment comprises a spraying robot (1), a plasma spray gun (2), a platinum-rhodium alloy tube (3), an infrared thermometer (4), an inner supporting structure (5), an adjustable rotating device (6) and a movable bracket (7); the front end of the spraying robot (1) is connected with a plasma spray gun (2), and an infrared thermometer (4) is arranged on the plasma spray gun (2); a platinum-rhodium alloy pipe (3) is arranged right in front of the plasma spray gun (2), and the inside of the platinum-rhodium alloy pipe (3) is supported by an inner supporting structure (5); the inner supporting structure (5) is connected with the movable bracket (7) through the adjustable rotating device (6);
the method comprises the following specific steps:
(1) Assembling an inner support structure: the device comprises a main supporting rod (5-1), a mechanical jack (5-2), a secondary supporting rod (5-3), a plane supporting plate (5-4), a semicircular supporting rod (5-5), a sealing end plate (5-6), a sealing end cover (5-7), an outer hoop clamping ring (5-8), a sealing ring (5-9), a cooling medium inlet (5-10), a cooling medium outlet (5-11), a main supporting rod connecting shaft (5-12) and a secondary supporting rod connecting shaft (5-13);
(2) And (3) sealing and assembling: the inner supporting structure assembled in the step (1) is folded to the main supporting rod (5-1) and the secondary supporting rod (5-3) through a folding mechanical jack (5-2), then the inner supporting structure is arranged in the platinum-rhodium alloy pipe (3), and the secondary supporting rod (5-3) is unfolded and fixed through the torsion mechanical jack (5-2); the sealing end plate (5-6), the sealing ring (5-9), the main supporting rod (5-1) and the secondary supporting rod (5-3) are connected to the two end sides of the platinum-rhodium alloy pipe (3) through bolts, then the outer hoop clamping ring (5-8) is clamped on the same plane of the sealing end plate (5-6), the sealing end cover (5-7) is connected to the outer side of the sealing end plate (5-6) in a sealing mode, the inner supporting structure (5) and the platinum-rhodium alloy pipe (3) form a recyclable airtight space, finally the supporting platform (7) is moved to a proper position, and the device is inserted into a connecting notch of the adjustable rotating device (6) and fixed;
(3) And (3) circularly cooling: introducing a cooling medium into the tool obtained in the step (2), allowing the cooling medium to enter from a cooling medium inlet (5-10), flowing in a closed space formed by the inner support structure (5) and the platinum-rhodium alloy tube (3), and flowing out from a cooling medium outlet (5-11); controlling the surface temperature of the platinum-rhodium alloy tube (3) in the spraying process by adjusting the flow of the cooling medium;
(4) Infrared sensing: the spraying temperature is monitored by an infrared thermometer (4) arranged on a plasma spray gun (2), the flow rate of a cooling medium and the spraying travelling speed are regulated, and the surface temperature of a workpiece is ensured not to exceed the thermodynamic recrystallization temperature T m ；
(5) Spraying: controlling the spraying robot (1), the plasma spray gun (2) and the infrared thermometer (4) through the steps, setting plasma equipment parameters according to a spraying medium, and performing plasma spraying on the platinum-rhodium alloy pipe fitting; the infrared sensing temperature is regulated by combining the flow rate of the cooling medium and the travelling speed of the spray gun in the spraying process, and the spraying effect is achieved through multi-pass spraying and measurement and detection of a coating thickness meter.
2. The method for spraying the internal support, circulation and cooling of the large thin-wall platinum-rhodium alloy tube according to claim 1, which is characterized in that: the rhodium content in the platinum-rhodium alloy pipe (3) is 0.1% -20% by mass;
the thickness of the tube wall of the platinum-rhodium alloy tube (3) is 0.3-1mm; the section size of the pipe body is 200-680 mm, and the length of the pipe body is less than 6000mm;
the section of the pipe body is round, oval, waist round or rectangular.
3. The method for spraying the internal support, circulation and cooling of the large thin-wall platinum-rhodium alloy tube according to claim 1, which is characterized in that: the spraying medium is Al 2 O 3 Powder or ZrO 2 Powder;
the spraying medium is Al 2 O 3 When the powder is sprayed, the spraying current is 550-600A, the spraying voltage is 58-62V, and the spraying speed is 1.1-1.3L/min; the distance between the flame center of the plasma spray gun (2) and the platinum-rhodium alloy tube (3) is 100-120 mm;
the spraying medium is ZrO 2 When the powder is sprayed, the spraying current is 580-680A, the spraying voltage is 64-66V, and the spraying speed is 1.4-1.6L/min; the distance between the flame center of the plasma spray gun (2) and the platinum-rhodium alloy tube (3) is 120-150mm.
4. An internal support mechanism for use in a large thin-walled platinum-rhodium alloy pipe internal support cyclic cooling spray method according to any one of claims 1 to 3, characterized in that: comprises an inner supporting structure (5), an adjustable rotating device (6) and a movable bracket (7); the inner supporting structure (5) comprises a supporting and adjusting mechanism and an end connecting mechanism, the supporting and adjusting mechanism is used for supporting and adjusting products, and two ends of the supporting and adjusting mechanism are respectively connected with the adjustable rotating device (6) through the end connecting mechanism; the lower end of the adjustable rotating device (6) is supported by a movable bracket (7);
the inner support structure (5) comprises a main support rod (5-1) and secondary support rods (5-3) positioned on two sides of the main support rod (5-1); the main supporting rod (5-1) is connected with the secondary supporting rod (5-3) through a mechanical jack (5-2); both ends of the main supporting rod (5-1) are connected with the main supporting rod connecting shafts (5-12), and both ends of the secondary supporting rod (5-3) are connected with the secondary supporting rod connecting shafts (5-13);
the main support rod connecting shaft (5-12) and the secondary support rod connecting shaft (5-13) are connected with the sealing end plate (5-6) through sealing rings (5-9), and the sealing end plate (5-6) is provided with a sealing end cover (5-7);
the sealing end plate (5-6) is connected with the outer hoop clamping ring (5-8), and a closed space is formed among the outer hoop clamping ring (5-8), the sealing end cover (5-7) and the sealing end plate (5-6); a cooling medium inlet (5-10) is arranged on one side sealing end plate (5-6), and a cooling medium outlet (5-11) is arranged on the other side sealing end plate (5-6);
a plurality of plane support plates (5-4) are uniformly distributed on the main support rod (5-1), and a plurality of semicircular support rods (5-5) are uniformly distributed on the secondary support rods (5-3);
the adjustable rotating device (6) comprises a double-row deep groove ball bearing (6-1), a fixed flange plate (6-2), a rotating shaft sleeve (6-3) and an oil sealing cover (6-4); two sides of the inner supporting structure (5) are respectively connected with an adjustable rotating device (6); the main support rod connecting shaft (5-12) is connected with the rotary shaft sleeve (6-3), and the rotary shaft sleeve (6-3) is connected with the fixed flange plate (6-2); the inside of the fixed flange plate (6-2) is provided with a double-row deep groove ball bearing (6-1), and the fixed flange plate (6-2) is sealed by an oil sealing cover (6-4);
the adjustable rotating device is characterized in that a movable support (7) is arranged below the adjustable rotating device (6), the movable support (7) comprises a support body (7-1) and universal wheels (7-2), and the universal wheels (7-2) are arranged below the support body (7-1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810117720.4A CN108165922B (en) | 2018-02-06 | 2018-02-06 | Internal support circulation cooling spraying method and internal support mechanism for large thin-wall platinum rhodium alloy pipe |
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| CN201810117720.4A CN108165922B (en) | 2018-02-06 | 2018-02-06 | Internal support circulation cooling spraying method and internal support mechanism for large thin-wall platinum rhodium alloy pipe |
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| CN108165922B true CN108165922B (en) | 2023-08-18 |
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| CN111593282B (en) * | 2020-05-29 | 2022-10-11 | 钱勇 | Copper clad steel wire forming post-processing equipment |
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|---|---|---|---|---|
| CN1844442A (en) * | 2006-04-30 | 2006-10-11 | 河海大学 | Method for plasma spraying of wearable coating for aluminium alloy matrix surface |
| CN204954196U (en) * | 2015-09-16 | 2016-01-13 | 上海海隆石油管材研究所 | Compound steel pipes pipe end seals and welds with gas protection and interior strutting arrangement of cooling heat dissipation |
| CN207904349U (en) * | 2018-02-06 | 2018-09-25 | 无锡英特派金属制品有限公司 | Inner support mechanism for the spraying of large thin-wall platinum-rhodium alloy pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7377039B2 (en) * | 2003-05-29 | 2008-05-27 | Saudi Arabian Oil Company | Anti-corrosion protection for heat exchanger tube sheet and method of manufacture |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1844442A (en) * | 2006-04-30 | 2006-10-11 | 河海大学 | Method for plasma spraying of wearable coating for aluminium alloy matrix surface |
| CN204954196U (en) * | 2015-09-16 | 2016-01-13 | 上海海隆石油管材研究所 | Compound steel pipes pipe end seals and welds with gas protection and interior strutting arrangement of cooling heat dissipation |
| CN207904349U (en) * | 2018-02-06 | 2018-09-25 | 无锡英特派金属制品有限公司 | Inner support mechanism for the spraying of large thin-wall platinum-rhodium alloy pipe |
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Address after: Xishan District Beizhen Jiangsu province 214192 new Tin Village in Wuxi City Applicant after: Intel platinum Co.,Ltd. Address before: 214194 No. 66, Jinghong Road, Xibei Town, Xishan District, Wuxi City, Jiangsu Province Applicant before: WUXI INTERNATIONAL PLATINUM Co.,Ltd. |
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