JPH07252630A - Thermal spraying method and thermal spraying controller fro arc thermal spraying device - Google Patents

Abstract

PURPOSE:To form colorful deposited layers changed in the degree of various densities with the colors of the same system by controlling the ratio of the component ratios of plural thermal spraying materials and blowing the droplets of the respective thermal spraying materials to a base metal by compressed air, thereby depositing the materials. CONSTITUTION:A first wire 3 is delivered to a conduit 8a and a second wire 4 to a conduit 8b. The feed speeds of the wires 3, 4 are controlled by controlling wire speed motors 6a, 6b according to thermal spraying conditions. The conduits 8a, 8b are brought into contact with the wires 3, 4 at an arc point 11. The current meeting the thermal spraying conditions and the voltage of a specified value are impressed between the wires 3 and 4 to generate arcs, by which the wires 3, 4 are subjected to thermal spraying at the ratio proportional to the heat input and feed speed of this time. The compressed air is injected forward from an air injection port 10 so as to shield the wires 3, 4, thereby forming air flow 12. The droplets 13 of the molten wires 3, 4 are transported by this air flow 12 and are brought into collision as high- velocity blowing air flow 14 against surface of the base metal 15, by which the droplets are deposited thereon and the thermally sprayed layers are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spraying method for an arc spraying apparatus and a spraying control apparatus which are applied to a base material, for example, a bridge strut, a sluice gate, or other steel structure product when it is colored.

[0002]

2. Description of the Related Art Conventionally, single color spraying is generally used for anti-corrosion spraying and color spraying of steel structure products, but sometimes a completely different spraying material is used and this is sprayed as a different color or I used to color paint on the surface. The conventional thermal spraying method is performed as follows. That is, as shown in FIG. 5, the surface of the base material 21 made of mild steel is first blasted using rough red iron oxide or Al ₂ O ₃ abrasive powder to roughen the surface to improve the thermal spray adhesion. .

Next, Al of about 100 μm is sprayed on the surface of the base material 21 to form an Al sprayed layer 22 on the surface of the base material 21. At that time, as shown in FIG. 6, a gas flame spraying torch 33 having an Al powder tank 32 is used, and a carrier gas (acetylene gas) 31 is supplied to this to form an Al sprayed layer 22 on the surface of the base material 21. To do. This Al sprayed layer 2
2 is porous.

Next, the surface of the porous Al sprayed layer 22 is spray-coated with an epoxy resin coating solution containing a passive phosphoric acid solution from the viewpoint of corrosion resistance, and the Al sprayed layer 22 is impregnated with the epoxy resin coating solution to obtain an epoxy resin of about 15 μm. Forming layer 23,
Perform sealing treatment. Next, a color coat resin containing the desired color is spray-coated on the surface of the epoxy resin layer 23, and 1
The color coat resin layer 24 having a thickness of about 5 μm is formed.

[0005]

The above Al sprayed layer 22
Has good anticorrosion property and long aging life, but the outermost color coat resin layer 24 deteriorates with age and thins due to ultraviolet rays and rainwater, and the color and luster deteriorate drastically, requiring early repainting. Therefore, running cost increases. Further, due to the limitation of the thermal spray material to be used, it was not possible to perform colorful coloring only with the thermal spray layer having good corrosion resistance. In addition, it was not possible to draw a design by controlling the hue of coloring during thermal spraying.

The present invention has been proposed in view of the above problems, and its object is to reduce the running cost, to form a colorful welding layer, and to freely control the hue of the welding layer. The present invention aims to provide a thermal spraying method and a thermal spraying control device that can be designed arbitrarily.

[0007]

In order to achieve the above object, a method of spraying an arc spraying apparatus according to the present invention is a method of spraying a plurality of spraying materials to an arc point at a feed rate according to the spraying conditions. Send, contact here, apply a current value and a constant voltage value according to the spraying conditions between each other, generate an arc, melt and control the ratio of the component amount of each spray material At the same time, the molten droplets of each thermal spray material are sprayed onto the base material by compressed air to form a weld layer, which is characterized by continuously changing the degree of color shading with the same system color. There is.

Further, the thermal spraying control device of the present invention has a usage amount calculation circuit for calculating the usage amount of each thermal spraying material based on the set value from the tint condition setting means and outputting the calculation result for each thermal spraying material. Based on the calculation results of the current value calculation circuit, the usage calculation circuit and the current value calculation circuit, which calculates the current value of the thermal spraying conditions based on the calculation result of the usage calculation circuit in each output system of the usage calculation circuit. The present invention is characterized in that each of them is connected to a feed rate calculation circuit for calculating the feed rate of the sprayed material in the spraying conditions.

[0009]

The present invention is configured as described above, and a plurality of thermal spraying materials are sent to the arc point at a feed rate according to the thermal spraying conditions for each thermal spraying material, and are brought into contact with each other at this point so that the thermal spraying conditions are maintained between them. By applying a current value and a constant voltage value according to, an arc is generated and melted to control the ratio of the component amount of each spray material, and the molten droplets of each spray material are compressed by compressed air. Spray on the base material, weld it, form a welding layer,
The degree of shade of color is continuously changed with the same system color.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the thermal spraying method for an arc spraying apparatus of the present invention will now be described with reference to FIG. 1. 1 is a first wire reel, 2 is a second wire reel, and 3 is a first wire (first thermal spray material). ) 4, a second wire (second thermal spray material), 5a a feeding roller for the first wire 3, 5b a feeding roller for the second wire 4,
6a is a drive motor for the wire feed roller 5a, 6b is a drive motor for the wire feed roller 5b, and 7a is a drive motor 6a.
Speed reducer, 7b is a drive motor 6b speed reducer, and 8a is the first
Wire 3 conduit, 8b second wire 4 conduit, 9 compressed air inlet, 10 compressed air injection port formed around confluence of conduits 8a, 8b, 11 arc point, 12 compressed air injection Air flow ejected from the mouth 10, 13 is a droplet, 14
Is a blowing air flow, and 15 is a base material.

In the arc spraying apparatus shown in FIG. 1, the rotation of the drive motor 6a is transmitted to the wire feeding roller 5a via the speed reducer 7a, and the wire feeding roller 5a is rotated to move the first feeding roller 5a.
The wire 3 is paid out from the first wire reel 1 and the conduit 8
At the same time as sending to the a, the rotation of the drive motor 6b is transmitted to the wire feeding roller 5b through the speed reducer 7b, the wire feeding roller 5b is rotated, and the second wire 4 is paid out from the second wire reel 2. It is sent to the conduit 8b.

At this time, the rotation speeds of the wire feeding motors 6a and 6b are controlled according to the spraying conditions, and the first wire 3 and the second wire 3
The feeding speed of the wire 4 is controlled. The conduit 8
a and 8b are configured to bring the first and second wires 3 and 4 into contact with each other at the arc point 11, and the first and second wires 3 and 4 have a constant current and a value corresponding to the spraying condition. Value voltage is applied to generate an arc, and the first wire 3 and the second wire
The wire 4 is melted at a rate proportional to the amount of heat input and the feed rate (feed rate) at that time.

On the other hand, the compressed air fed to the compressed air inlet 9 is spirally swirled and jetted forward from the air jet port 10 so as to shield the first and second wires 3 and 4 to produce an air flow. 12 is formed, and the molten droplets 13 of the first and second wires 3 and 4 which are melted by the air flow 12 are conveyed and collided as a high-speed spray air flow 14 onto the surface of the base material 15 to be fused and sprayed. Form the layers.

As described above, the feeding speed (feeding amount) of the first and second wires 3 and 4 and the applied current value are controlled according to the thermal spraying conditions, and a constant voltage is applied to melt the first wire. 1st and 2nd
The ratio of the component amounts of the wires 3 and 4 is changed to continuously change the degree of color shading for the same system color. The compressed air is squeezed to cool the high-temperature plasma flow and is injected to cool the surrounding area. Therefore, the compressed air flow rate may be set to be substantially constant.

[0015] Figure 2, using two wires made of Al and Z _n [A unit: dark (gray)] [B section: neutral (off-white)] [C unit: pale (silvery white)] 3 shows a thermal spraying test piece in which the thermal sprayed layers 17 of three types of colors are formed on the surface of the base material 15 and an example of the thermal spraying conditions of the parts A to C. At that time, Al
The proportions of the components of the Z _n by controlling the feed rate of the wire so that in Table 1 and the current value and the scanning speed of the spray gun and,
Parts A to C were created. The above control is performed by a computer.

[0016]

[Table 1]

[0017] Figure 3, Al in the A portion ~C portion shows the deposition rate of Z _n. Although two types of wires are used in the above embodiments, three or more types of wires can also be used. FIG. 4 shows an example of a thermal spray control device used when forming a thermal spray layer by the arc thermal spray device shown in FIG.

Reference numeral 51 is a color condition setting lever for setting a color condition which is known in advance, and 52 is a calculation result of the amount of use of the first and second wires 3 and 4 by the set value from the color condition setting lever 51. Is a usage amount calculation circuit for outputting from the first wire output system 53 and the second wire output system 58. In the first wire output system 53 of the usage amount calculation circuit 52, a current value calculation circuit 54 that calculates a current value based on the calculation result of the usage amount calculation circuit 52, the usage amount calculation circuit 52, and the current value calculation circuit 54. A feed rate calculation circuit 55 that calculates the first wire feed rate of the thermal spraying conditions based on the calculation result of is connected.

Reference numeral 56 denotes a transformation motor control device 56 connected to the feeding speed calculation circuit 55.
6 controls the rotation speed of the wire feed roller drive motor 6a. Further, in the second wire output system 58 of the usage amount calculation circuit 52, a current value calculation circuit 59 for calculating the current value of the spraying conditions based on the calculation result of the usage amount calculation circuit 52, and the usage amount calculation circuit 52. And a feed rate calculation circuit 60 for calculating the second wire feed rate in the spraying conditions based on the calculation result of the current value calculation circuit 59.

Reference numeral 61 is a transformation motor control device, and the transformation motor control device 61 is the drive motor 6 for the wire feeding roller.
The rotation speed of b is controlled. In the above thermal spraying control device, the set value of the tint condition setting lever 51 is output to the usage amount calculation circuit 52, where the first and second wires 3, 4 are fed.
The amount of use of the wire is calculated, and the calculation result is used for the first wire output system 5
The current value calculation circuit 54 from the third and second wire output system 58,
It is output to 59, and the current value of the spraying conditions is calculated here.

The calculation result and the calculation result of the usage amount calculation circuit 52 are output to the feed rate calculation circuits 55 and 60, where the feed rates of the first and second wires 3 and 4 in the spraying conditions. (Feeding amount) is calculated, and the calculation result is output to the transformation motor control devices 56 and 61, and the rotation number of the wire feeding roller drive motors 6a and 6b is determined by the transformation motor control devices 56 and 61. Change.

At this time, since the voltage may be constant as shown in the table of FIG. 2, the calculation of the voltage condition is unnecessary. In this way, the feeding speed (feeding amount) of the first and second wires 3 and 4 and the applied current value are controlled according to the thermal spraying conditions, and a constant voltage is applied to melt the first and second wires. By changing the ratio of the component amounts of the two wires 3 and 4, the degree of color shading is continuously changed in the same system color.

[0023]

As described above, the present invention sends a plurality of thermal spraying materials to the arc point at a feeding speed according to the thermal spraying conditions for each thermal spraying material,
Contact here, applying a current value and a constant voltage value according to the spraying conditions between each other, to generate an arc, to melt, while controlling the ratio of the component amount of each spray material, The molten droplets of each thermal spray material are blown onto the base material by compressed air to fuse them to form a weld layer, which continuously changes the degree of color shade with the same system color, so it has excellent corrosion resistance. It is possible to form a welded layer (outermost layer film portion), and as compared with the conventional color coat resin layer, it is not necessary to perform repainting at an early stage, and the running cost can be reduced.

Further, the thermal spray material to be used can be arbitrarily selected,
A colorful welding layer (outermost layer film part) can be formed. Further, since the feed rate (feed amount), current, etc. of each thermal spray material is controlled, the tint of the weld layer (outermost layer coating portion) can be freely controlled during thermal spraying. It is also possible to change the direction of thermal spraying and design it arbitrarily.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a thermal spraying method for an arc spraying apparatus of the present invention.

FIG. 2 is a diagram showing a case _where two kinds of wires composed of Al and Z _n are used.
Part: dark color (gray), part B: intermediate color (gray white) and part C: light color (silver white) It is explanatory drawing which shows an example of thermal spraying conditions.

[Figure 3] Al in the A portion ~C unit is an explanatory diagram showing a deposition rate of Z _n.

FIG. 4 is a system diagram showing an embodiment of the thermal spraying control device of the present invention.

FIG. 5 is an explanatory view showing each sprayed layer obtained by a conventional spraying method.

FIG. 6 is a side view showing a gas flame spraying torch used in the same spraying method.

[Explanation of symbols]

 1 1st thermal spray material (wire) reel 2 2nd thermal spray material (wire) reel 3 1st thermal spray material (1st wire) 4 2nd thermal spray material (2nd wire) 5a 1st wire 3 feeding roller 5b 2nd Wire 4 feed roller 6a Wire feed roller 5a drive motor 6b Wire feed roller 5b drive motor 7a Drive motor 6a reducer 7b Drive motor 6b reducer 8a First wire 3 conduit 8b Second wire 4 Conduit 9 Compressed air inlet 10 Compressed air jet 11 Arc point 12 Air flow 13 Droplet 14 Spraying air flow 15 Base material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiaki Moriya 12 Nishiki-cho, Naka-ku, Yokohama-shi Kanagawa Mitsubishi Heavy Industries, Ltd.Yokohama Works (72) Inventor Keigo Ishiguro 12 Nishiki-cho, Naka-ku, Yokohama Mitsubishi Heavy Industries Yokohama Works Co., Ltd.

Claims (2)

[Claims] 1. A plurality of thermal spraying materials are sent to an arc point at a feed rate according to the thermal spraying conditions for each of the thermal spraying materials, and are brought into contact with each other, and a current value and a constant voltage value according to the thermal spraying conditions are provided between them. By applying, and generating an arc, and melting, while controlling the ratio of the component amount of each thermal spray material, spray the droplets of the molten thermal spray material to the base material by compressed air, to weld,
A thermal spraying method for an arc thermal spraying device, characterized in that a welding layer is formed to continuously change the degree of color shading with the same system color. 2. A usage amount calculation circuit for calculating the usage amount of each thermal spray material based on the set value from the color condition setting means and outputting the calculation result for each thermal spray material, and each output of the usage amount calculation circuit. In the system, a current value calculation circuit for calculating a current value of the thermal spraying conditions based on the calculation result of the usage amount calculation circuit, and a thermal spray material of the thermal spraying conditions based on the calculation results of the usage amount calculation circuit and the current value calculation circuit. A thermal spraying control device, characterized in that the thermal spraying control device is connected to a feeding speed calculation circuit for calculating the feeding speed.