CN112974071B - Coating surface modification device based on thermal spraying process and working method - Google Patents
Coating surface modification device based on thermal spraying process and working method Download PDFInfo
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- CN112974071B CN112974071B CN202110201189.0A CN202110201189A CN112974071B CN 112974071 B CN112974071 B CN 112974071B CN 202110201189 A CN202110201189 A CN 202110201189A CN 112974071 B CN112974071 B CN 112974071B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B16/00—Spray booths
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
- B05B13/0221—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work characterised by the means for moving or conveying the objects or other work, e.g. conveyor belts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
- B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
- B05B13/0405—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with reciprocating or oscillating spray heads
- B05B13/041—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with reciprocating or oscillating spray heads with spray heads reciprocating along a straight line
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B16/00—Spray booths
- B05B16/60—Ventilation arrangements specially adapted therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0486—Operating the coating or treatment in a controlled atmosphere
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- Nozzles (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses a coating surface modification device based on a thermal spraying process and a working method thereof, which solve the problems of surface oxidation and non-uniformity of a coating in the prior art and have the beneficial effects of reducing the surface oxidation and residual stress of a workpiece, and the specific scheme is as follows: a coating surface modification device based on a thermal spraying process comprises a shell, wherein a cavity is formed in the shell, a moving mechanism is arranged on the inner side or the outer side of the shell, an opening is formed in the side part of the shell, the moving mechanism can drive a workpiece to penetrate through the opening to move, protective gas can be introduced into the shell, and an elastic inlet-outlet mechanism is arranged on the side of the shell to ensure that the workpiece enters the cavity in the shell and the shell is sealed; the spray gun is arranged on the outer side of the shell; and a temperature control unit including a heating control part installed at the housing to control an ambient temperature inside the housing.
Description
Technical Field
The invention relates to the technical field of surface engineering, in particular to a coating surface modification device based on a thermal spraying process and a working method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The plasma spraying technology is a technology which adopts a plasma arc driven by direct current as a heat source, heats spraying materials such as ceramics, alloys, metals and the like to a molten or semi-molten state to form a cluster of high-speed molten particle flow (molten droplet flow), sprays the high-speed molten particle flow (molten droplet flow) to the surface of a pretreated substrate at a high speed, deforms through the transverse flow of the particles, rapidly cools and solidifies, and continuously deposits on the surface of the substrate to form a coating. After being treated by the plasma spraying technology, the coating has a layered structure, and the surface of the workpiece is endowed with excellent performances of wear resistance, corrosion resistance and the like.
However, the conventional plasma spraying is carried out between spraying, spraying particles are easily oxidized in the process of spraying the particles to the surface of a substrate, an oxide exists in an obtained coating, the coating is of a layered structure, and the defects of pores, cracks and the like are inevitably generated on the surface due to incomplete filling and shielding effects; after the spraying is finished, the molten particles are rapidly cooled on the surface of the matrix, so that the liquid molten particles cannot be fully wetted with the solidified particles to form complete combination, and a large number of uncombined interfaces exist among the laminated particles; on the other hand, the rapid cooling of the molten particles can generate high residual stress between the coating and the metal matrix interface, so that cracking is easily caused, and the application range and the service life of the coating in the service process are influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a coating surface modification device based on a thermal spraying process, which can improve the surface performance of a workpiece and reduce the surface oxidation, porosity and residual stress of the workpiece.
In order to realize the purpose, the invention is realized by the following technical scheme:
a coating surface modification device based on a thermal spraying process comprises:
the device comprises a shell, a cavity is arranged in the shell, a moving mechanism is arranged on the inner side or the outer side of the shell, an opening is formed in the side part of the shell, the moving mechanism can drive a workpiece to pass through the opening to move, protective gas can be introduced into the shell, and an elastic in-out mechanism is arranged on the side of the shell to ensure that the workpiece enters the cavity in the shell and ensure the sealing performance of the shell;
the spray gun is arranged on the outer side of the shell and can move;
and a temperature control unit including a heating control part installed at the housing to control an ambient temperature inside the housing.
According to the coating surface modification device based on the thermal spraying process, the elastic sealing parts are arranged at the opening of the shell in a vertically contacting manner, a space can be provided between the two elastic sealing parts which are arranged vertically in the process that a workpiece passes through the opening of the shell, and the sealing performance at the opening of the shell can be ensured through the arrangement of the elastic sealing parts.
As above a coating surface modification device based on thermal spraying technology, elasticity business turn over mechanism includes rotatable running roller, and running roller one side sets up a plurality of elastic components that set up side by side, elastic component one end with the casing is connected, can pass through casing open-ended in-process at the work piece between elastic component and the running roller and provide the space, and because of the setting of elastic component, can realize passing through of different thickness work pieces gets into in the casing sealed cavity relatively.
The coating surface modification device based on the thermal spraying process comprises a shell, a shell and a top plate, wherein the shell comprises a detachable top plate, and an interface used for accommodating one end of the elastic piece is arranged on the inner surface of the top plate;
and the elastic component is a spring, one end of the spring is clamped into the top plate interface, the bolt passes through the inner side of the elastic component, the head of the bolt is exposed out of the end part of the elastic component far away from the top plate, the head of the bolt is provided with a tapered roller, the tapered roller is in contact with the roller, the tapered roller is convenient to set through the bolt, the central axis of the tapered roller is arranged along the length direction of the shell, and the smaller end of the tapered roller is arranged towards the opening side of the shell.
According to the coating surface modification device based on the thermal spraying process, the heating control component comprises a heating resistor arranged on the shell, the heating resistor is connected with the current controller, the shell is provided with the temperature sensor, the current controller and the temperature sensor are respectively connected with the controller, and the temperature of the environment in the shell can be ensured through the heating resistor.
According to the coating surface modification device based on the thermal spraying process, the temperature control unit further comprises a cooling part, the cooling part comprises a cooling liquid inlet and a cooling liquid outlet which are arranged on the shell, the cooling liquid inlet and the cooling liquid outlet are both connected with the cooling liquid pipeline, and the cooling speed of the shell can be accelerated conveniently through the cooling part.
According to the coating surface modification device based on the thermal spraying process, in order to supply protective gas to the shell, the shell is provided with the gas interface, the gas interface is connected with the gas cylinder, and a connecting pipeline of the gas cylinder and the gas interface is provided with the gas pressure control component;
the air pressure control component and the moving mechanism are respectively connected with the controller, and the controller is a general control unit of the device.
According to the coating surface modification device based on the thermal spraying process, in order to save the device setting space, the moving mechanism is a screw mechanism arranged in the shell, the screw mechanism comprises a motor, the motor is connected with a screw, the screw is provided with a baffle, and the baffle is detachably connected with the workpiece through a fastener;
the movable direction of the spray gun is perpendicular to the moving direction of the moving mechanism.
In order to ensure reliable support and fixation of a workpiece, the shells are respectively arranged at two sides of the spray gun, and each shell is respectively provided with the temperature control unit;
the adjacent sides of the shells on the two sides of the spray gun are respectively provided with the openings, and the openings of the two shells are arranged on the same plane.
In a second aspect, the invention also provides a working method of the coating surface modification device based on the thermal spraying process, which comprises the following steps:
installing a workpiece through a moving mechanism;
introducing protective gas with set pressure into the shell;
the heating control part is turned on so that the temperature in the shell reaches a set temperature;
opening a spray gun to perform plasma spraying on the workpiece;
the moving mechanism drives the part of the workpiece after spraying to enter the cavity of the shell through the opening of the shell, the protective gas in the shell prevents the coating from being oxidized, and the temperature set in the shell ensures that the coating is more compact;
and after the spraying is finished, adjusting the temperature of the heating control part to slowly cool the temperature in the shell until the temperature reaches the room temperature, and then stopping heating the heating control part.
The beneficial effects of the invention are as follows:
1) according to the invention, the arrangement that the inert gas can be introduced into the shell is adopted, so that the sprayed part of the workpiece can quickly enter the inert gas environment in the shell after plasma spraying, the oxidation of the coating is effectively reduced, and the purity and the performance of the coating are ensured.
2) According to the invention, through the arrangement of the temperature control unit, the heating control component can heat the internal environment of the shell, after spraying is finished, the controllable temperature environment can keep the temperature in the cavity at the set temperature, the temperature is slowly cooled, and the residual stress caused by temperature shock cooling to the surface is reduced, so that the comprehensive performance is improved, and the service life is prolonged.
3) According to the invention, through the arrangement of the integral structure, when part of the workpiece is not sprayed, the performance of the sprayed part entering the shell can be improved, compared with a post-treatment process, the improvement on the performance of the workpiece coating in the spraying process is quicker and easier to realize, and the workpiece surface is sent into the shell for modification without being cooled to room temperature in consideration of the set temperature of the workpiece surface after spraying, so that the integral energy consumption is lower.
4) According to the invention, the elastic sealing element is arranged at the opening of the shell, the elastic in-out mechanism is arranged at the inner side of the opening of the shell, and a channel for the transverse movement of the workpiece is formed together, the elastic sealing element and the spring can adapt to the in-out of the workpieces with different thicknesses, and the atmosphere of the environment in the cavity of the shell is ensured at the same time, on the other hand, when the workpiece enters and exits the shell, the elastic sealing element, the spring, the tapered roller and the roller can roll the workpiece to a certain degree, and the passive pressure can enable the combination of liquid drops in the solidification process and the matrix to be firmer, effectively reduce the defects of pores, cracks and the like of the coating, and enable the coating to be more compact.
5) The workpiece is driven to transversely move by the moving mechanism, so that the spray gun can set unidirectional longitudinal motion, the spray gun and the workpiece respectively bear the motion in one direction, and the quality change of a sprayed coating caused by the speed change of the movement of the mechanical arm at an inflection point in the traditional plasma spraying is avoided; local hot spots and surface oxidation in the coating can also be prevented during the spraying operation.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic illustration of an apparatus for modifying a surface of a coating based on a thermal spray process according to one or more embodiments of the present invention.
FIG. 2 is a schematic illustration of a housing removal ceiling in a thermal spray process based coating surface modification apparatus according to one or more embodiments of the present invention.
FIG. 3 is a schematic illustration of a thermal spray process based coating surface modification apparatus housing opening with elastomeric seal according to one or more embodiments of the present invention.
FIG. 4 is a schematic illustration of a thermal spray process based coating surface modification apparatus with flexible access mechanism in a housing, according to one or more embodiments of the present invention.
FIG. 5 is a schematic top plate of a thermal spray process based coating surface modification apparatus according to one or more embodiments of the present invention.
FIG. 6 is a schematic illustration of a thermal spray process based coating surface modification apparatus temperature control unit disposed in a housing according to one or more embodiments of the present invention.
In the figure: the spacing or dimensions between each other are exaggerated to show the location of the various parts, and the schematic is shown only schematically.
Wherein: 1. the spray gun comprises a spray gun body, a workpiece, a top plate, a shell, a side plate, a sealing strip, a spring, a bolt, a screw bolt, a conical roller, a baffle plate, a lead screw, a motor, a spring interface, a thermocouple, a temperature controller, a heating resistor, a current controller, a cooling liquid inlet, a cooling liquid outlet, a gas interface, a pressure gauge and a pressure reducing valve, wherein the work piece is 2, the top plate is 3, the shell is 4, the side plate is 5, the sealing strip is 6, the spring is 7, the bolt is 8, the conical roller is 9, the roller is 10, the baffle plate is 11, the lead screw is 12, the motor is 13, the spring interface is 14, the thermocouple is 15, the temperature controller is 16, the heating resistor is 17, the current controller is 18, the cooling liquid inlet is 19, the cooling liquid outlet is 20, the gas interface is 21, the pressure gauge is 22 and the pressure reducing valve is 23.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with the directions of up, down, left and right of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
The term interpretation section: the terms "mounting," "connecting," "fixing," and the like in the present invention should be understood broadly, for example, they may be fixed, detachable, or integrated; the two components can be connected mechanically, electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the specific meaning of the terms in the present invention can be understood by those skilled in the art according to specific situations.
As introduced in the background art, the surface performance of a workpiece needs to be improved in the plasma spraying process in the prior art, and in order to solve the technical problem, the invention provides a coating surface modification device based on a thermal spraying process.
Example one
In an exemplary embodiment of the present invention, referring to fig. 1, a coating surface modification apparatus based on a thermal spraying process includes a housing 4, wherein the housing 4 has a chamber therein, the chamber has a set width, length and height, and the housing provides a basis for a workpiece to have a certain inert gas atmosphere, temperature and pressure environment adjustment during a plasma spraying process.
A moving mechanism is arranged on the inner side or the outer side of the shell 4, an opening is formed in a side plate 5 on the side of the shell, the moving mechanism can drive the workpiece 2 to penetrate through the opening to move, protective gas can be introduced into the shell, and an elastic in-out mechanism is arranged on the side of the shell on the opening side to ensure that the workpiece 2 enters an inner cavity of the shell and ensure the sealing performance of the shell; the spray gun 1 is arranged outside the shell 4; and a temperature control unit including a heating control part installed at the case to control an ambient temperature inside the case.
In this example, the protective gas is an inert gas.
Two sides of the spray gun are respectively provided with a shell 4, and each shell 4 is respectively provided with a temperature control unit; the near sides (namely the side parts close to the spray gun) of the shells at the two sides of the spray gun are respectively provided with an opening, and when the two shells are horizontally arranged, the openings of the two shells are arranged on the same horizontal plane; when the multifunctional portable workbench is used, the two shells are arranged on the workbench, and the workbench is provided with a set height, so that the operation of workers is facilitated.
The side plate 5 is located on one side of the shell 4, the side plate is provided with elastic sealing elements which are oppositely arranged at the rectangular opening, the elastic sealing elements are elastic sealing strips 6, the two elastic sealing strips are in contact arrangement, and when the workpiece 2 passes through the middle of the two elastic sealing strips 6, the two elastic sealing strips 6 are extruded and deformed so as to perform transverse movement between the two shells 4 through the openings of the side plate 5.
Further, the elastic in-and-out mechanism comprises a roller 10, as shown in fig. 4, the roller 10 is arranged in a housing 4, the rotatable roller 10 is supported by the housing, a central axis of the roller 10 is arranged along the width direction of the housing, a plurality of elastic members arranged side by side are arranged on one side of the roller, the elastic members are vertically arranged, one ends of the elastic members are connected with the housing, each elastic member is a spring 7, a rod body of a bolt 8 penetrates through the inner side of the elastic member, the head of the bolt is exposed out of the end part of the elastic member far away from the top plate, the head of the bolt can be fixedly connected with the end part of the spring close to the bolt, each bolt head is provided with two conical rollers, the two conical rollers are arranged side by side, and a space can be provided between the conical rollers 9 and the roller for the transverse movement of the workpiece in the process that the workpiece passes through the opening of the housing;
for the convenience work piece gets into in the casing, tapered roller's the central axis sets up along the length direction of casing, and the less one end of tapered roller diameter sets up towards the casing opening side.
When the workpiece 2 passes through the elastic in-and-out mechanism, the workpiece jacks up the tapered roller 9, the spring 7 contracts, and the roller 10 rotates passively to form an in-and-out passage for the workpiece 2 to move transversely in the two shells 4, so that the elastic mechanism for realizing the in-and-out of the workpieces with different thicknesses is formed, and the workpieces with different thicknesses pass through.
The top of the shell is provided with a top plate 3, the top plate 3 can be detached relative to the shell, when the top plate is opened, a workpiece can be conveniently installed, the top plate is located on the upper surface of the shell, and particularly, the top plate is a plane and can be fixedly connected with the shell through screws.
Referring to fig. 2, a moving mechanism is installed in the housing 4, the moving mechanism includes a motor 13 and a screw 12, the motor 13 drives the screw 12 to rotate, the screw is provided with a baffle, the screw 12 drives the baffle 11 to move transversely, the workpiece 2 is fixed to the baffle 11 through a fastener, and the two baffles 11 in the housings on the two sides drive the workpiece 2 to move transversely, so as to form a transverse movement control mechanism.
In some specific examples, the longitudinal section of the baffle can be L-shaped, so that the end part of the workpiece can be effectively supported by the L-shaped baffle, and the workpiece and the baffle can be conveniently connected and fixed by a fastener such as a bolt and a nut; of course, the baffles in the two shells are oppositely arranged.
Referring to fig. 6, the heating control part includes at least one set of heating resistors 17, the housing is provided with a temperature sensor, the temperature sensor is a thermocouple 15, two lateral ends of the thermocouple are located in the housing cavity, the heating resistors are connected with a current controller 18, the current controller can be arranged on the outer side of the housing, the thermocouple is connected with a temperature controller 16 arranged on the outer side of the housing, and the current controller 18 and the temperature controller are respectively connected with the controller.
In some examples, the heating resistor can be a plurality of heating resistors with different resistance materials, so that the temperature in the cavity can be controlled by using different resistance materials, and the requirements of different coatings on temperature grades can be met.
Furthermore, the temperature control unit also comprises a cooling part, the cooling part comprises a cooling liquid inlet 19 and a cooling liquid outlet 20 which are arranged on the shell, the cooling liquid inlet and the cooling liquid outlet are both connected with a cooling liquid pipeline, and cooling liquid is introduced through the cooling liquid inlet, so that the shell can be rapidly cooled; in some examples, the cooling pipeline is provided with a cooling liquid pump (specifically, a water pump), and the cooling pump is connected with the temperature controller;
by controlling the temperature of the shell, an environment with specific temperature is created for the shell, so that the particles are combined with the matrix more firmly when being melted, the layered structure of the coating and the pore and crack density in the coating are effectively reduced, and the coating has more excellent performance.
The shell 4 is provided with a gas interface 21, the gas interface 21 is connected with a gas cylinder and a pressure control component such as a pressure reducing valve 23 outside the shell 4, and protective gas such as argon can be continuously filled into the shell 4 through the gas cylinder and the pressure control component, so that an inert gas environment is provided for a workpiece in the plasma spraying process, and an inert gas protective atmosphere in the shell is formed.
The number of the gas interfaces 21 can be multiple, the gas interfaces are connected with the gas cylinder through a connecting pipeline, and the connecting pipeline is provided with a pressure gauge 22 and a pressure reducing valve 23.
Of course, it should be noted that the air pressure control component and the moving mechanism are respectively connected to the controller, and the control of each component is realized through the controller, and of course, the controller may also be connected to the spray gun to realize the control of the action of the spray gun.
It should be noted that the controller may be a PLC controller or an industrial personal computer, and components such as a temperature controller and a pressure reducing valve are all in the prior art and are not described in detail.
Specifically, the top plate 3 is mounted on the top end of the housing 4 to provide a sealed environment for the housing 4; referring to fig. 5, the lower surface of the top plate 3 is provided with a plurality of circular grooves, the circular grooves are respectively used for accommodating the connectors 14 of the springs 7, when the top plate is installed in the shell, the connectors correspond to the springs one by one, the top ends of the springs are clamped into the connectors, reliable positions are provided for the springs 7 to stretch in a single direction, and when the top plate is opened, the springs, the bolts and the tapered rollers can be moved, so that a workpiece can be installed conveniently.
In addition, the spray gun is a plasma spray gun which is positioned in the middle of the two symmetrically placed shells, the unidirectional movement of the spray gun is controlled by a mechanical arm or other control mechanisms such as a moving unit, the longitudinal displacement spraying is realized, the transverse displacement movement is realized under the control of the moving mechanism, and thus the workpiece and the spray gun respectively undertake the movement in one direction, and the quality change of a sprayed coating caused by the speed change of the movement of the mechanical arm at an inflection point is avoided.
When the device is used for spraying, the workpiece 2 is arranged in a position which passes through the middle of two sealing strips 6 of side plates 5 of two shells 4, the middle of a tapered roller 9 and a roller 10 and is connected with baffle plates 11 in the two shells 4 through fasteners;
specifically, in some examples, the inert gas is argon, the gas cylinder is an argon gas cylinder, and the gas interface 21 is connected to the argon gas cylinder.
Before the spray gun works, an argon bottle is opened, the pressure of argon is controlled to be 0.7MPa, the flow of the argon is controlled to be 50L/min, and an argon protective environment is formed in the shell 4. The temperature controller 16 is then turned on, the current is regulated, and the heating resistor 17 is controlled to a temperature of 300 c, taking into account the change in the air pressure inside the housing 4.
A working method of a coating surface modification device based on a thermal spraying process comprises the following steps:
opening a top plate of the shell, supporting the workpiece through a baffle plate of the moving mechanism, and fastening the baffle plate and the workpiece through a fastening piece;
introducing protective gas with set pressure into the shell;
the heating control part is turned on so that the temperature in the shell reaches a set temperature;
after the temperature and the air pressure in the shell 4 reach set requirements, the spray gun 1 is opened for plasma spraying, the spray gun can be connected with the existing mechanical arm, the longitudinal displacement (along the width direction of the workpiece) of the spray gun is controlled by the mechanical arm, and meanwhile, the motor 13 is started to control the transverse movement of the workpiece 2;
in the plasma spraying process, the oxidation of the coating can be effectively avoided due to the existence of the protective gas in the shell 4; the high-temperature environment in the shell 4 can ensure that the fusion particles are combined with the matrix more firmly, and the coating is more uniform and compact;
after the spraying is finished, the spray gun 1 is firstly closed, then the heating temperature of the heating resistor 17 is adjusted, the temperature in the shell 4 is slowly cooled until the room temperature is reached, the heating resistor 17 stops working, and finally the argon bottle is closed.
Because of considering that the workpiece has the set length, the two sides of the spray gun are both provided with the shells, after the middle section of the workpiece is sprayed, the workpiece firstly enters the shell on one side for surface modification, after the modification on the side is finished, the moving mechanism moves reversely, the steps are continuously repeated, and the workpiece enters the shell on the other side for surface modification.
In addition, because the baffle and the workpiece are fixed, the two sides of the workpiece cannot be sprayed on the outer side of the shell, and the spraying can be independently carried out after the middle section area of the workpiece is sprayed and modified; or after the middle section area of the workpiece is sprayed and modified, cutting the redundant parts at two sides.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A coating surface modification device based on a thermal spraying process is characterized by comprising:
the device comprises a shell, a cavity is arranged in the shell, a moving mechanism is arranged on the inner side or the outer side of the shell, an opening is formed in the side part of the shell, the moving mechanism can drive a workpiece to pass through the opening to move, protective gas can be introduced into the shell, and an elastic in-and-out mechanism is arranged on the side of the shell to ensure that the workpiece enters the cavity in the shell and ensure the sealing property of the shell;
the spray gun moves longitudinally;
two sides of the spray gun are respectively provided with a shell, each shell is respectively provided with a temperature control unit, the adjacent sides of the shells at the two sides of the spray gun are respectively provided with an opening, and when the two shells are horizontally arranged, the openings of the two shells are arranged on the same horizontal plane;
the temperature control unit comprises a heating control component arranged in the shell to control the ambient temperature in the shell; the shell is provided with a gas interface, the gas interface is connected with a gas cylinder, and a connecting pipeline of the gas cylinder and the gas interface is provided with a gas pressure control component; elastic sealing parts are arranged at the opening of the shell in a vertically contacting manner, and a space can be provided between the two elastic sealing parts arranged vertically in the process that a workpiece passes through the opening of the shell;
the elastic in-and-out mechanism comprises a rotatable roller, a plurality of elastic pieces arranged side by side are arranged on one side of the roller, one end of each elastic piece is connected with the shell, and a space can be provided between each elastic piece and the roller in the process that a workpiece passes through the opening of the shell.
2. The thermal spray process based coating surface modification apparatus of claim 1, wherein the housing comprises a removable top plate, an inner surface of the top plate being provided with an interface for receiving an end of the resilient member;
and the elastic piece is a spring, one end of the spring is clamped into the joint of the top plate, the bolt penetrates through the inner side of the elastic piece, the head of the bolt is exposed out of the end part of the elastic piece far away from the top plate, the head of the bolt is provided with a tapered roller, and the tapered roller is in contact with the roller.
3. The device for modifying the surface of a coating based on a thermal spraying process as claimed in claim 1, wherein the heating control component comprises a heating resistor mounted on the housing, the heating resistor is connected with a current controller, the housing is provided with a temperature sensor, and the current controller and the temperature sensor are respectively connected with the controller.
4. The device for modifying the surface of a coating based on a thermal spraying process as claimed in claim 1, wherein the temperature control unit further comprises a cooling member, the cooling member comprises a cooling fluid inlet and a cooling fluid outlet which are arranged on the housing, and the cooling fluid inlet and the cooling fluid outlet are connected with a cooling fluid pipeline.
5. The apparatus of claim 3, wherein the pneumatic control unit and the moving mechanism are connected to the controller respectively.
6. The coating surface modification device based on the thermal spraying process as claimed in claim 1, wherein the moving mechanism is a screw mechanism arranged in the housing, the screw mechanism comprises a motor, the motor is connected with a screw, the screw is provided with a baffle, and the baffle is detachably connected with the workpiece through a fastener;
the movable direction of the spray gun is perpendicular to the moving direction of the moving mechanism.
7. The method of any one of claims 1 to 6, comprising the following steps:
installing a workpiece through a moving mechanism;
introducing protective gas with set pressure into the shell;
the heating control part is turned on so that the temperature in the shell reaches a set temperature;
opening a spray gun to perform plasma spraying on the workpiece;
the moving mechanism drives the part of the workpiece after spraying to enter the cavity of the shell through the opening of the shell, the protective gas in the shell prevents the coating from being oxidized, and the temperature in the shell is set so that the coating is more compact;
and after the spraying is finished, adjusting the temperature of the heating control part to slowly cool the temperature in the shell until the temperature reaches the room temperature, and then stopping heating the heating control part.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110201189.0A CN112974071B (en) | 2021-02-23 | 2021-02-23 | Coating surface modification device based on thermal spraying process and working method |
| PCT/CN2021/093415 WO2022178984A1 (en) | 2021-02-23 | 2021-05-12 | Coating surface modification device based on thermal spraying process and working method |
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| CN202110201189.0A CN112974071B (en) | 2021-02-23 | 2021-02-23 | Coating surface modification device based on thermal spraying process and working method |
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| CN112974071B true CN112974071B (en) | 2022-07-15 |
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| CN115055296A (en) * | 2022-06-09 | 2022-09-16 | 海阳市静电设备有限公司 | Integrated powder spraying system with small occupied space |
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| WO2022178984A1 (en) | 2022-09-01 |
| CN112974071A (en) | 2021-06-18 |
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