KR101535936B1

KR101535936B1 - Method of continuousely manufacturing a clad sheet

Info

Publication number: KR101535936B1
Application number: KR1020080130582A
Authority: KR
Inventors: 김형준; 이창희
Original assignee: 재단법인 포항산업과학연구원
Priority date: 2008-12-19
Filing date: 2008-12-19
Publication date: 2015-07-13
Also published as: KR20100071760A

Abstract

The continuous clad sheet material manufacturing method includes a step of pre-treating a plate material unwound from a coil, spray coating a different material on the plate material, and performing a rolling process on the spray-coated plate material. Therefore, it is possible to mass-produce the clad plate material which is continuously coated with heterogeneous or three kinds of material which can not be made by the conventional method, and the thickness of the coating can be easily adjusted from several micrometers to several hundreds of micrometers. In addition, since the present invention uses a low-temperature spray coating method, it is easy to diversify the coating material and control the components. In addition, the rolling process makes it possible to produce high-performance plate materials with excellent bonding strength, high hardness, low porosity and excellent corrosion resistance and abrasion resistance compared to conventional low-temperature spray coatings.

Clad, Pretreatment, Rolling, Continuous Manufacturing, Spraying

Description

[0001] METHOD OF CONTINUOUS MANUFACTURING CLAD SHEET [0002]

The present invention relates to a method for continuously manufacturing a clad sheet material. More particularly, the present invention relates to a method for continuously manufacturing a clad sheet material in which different kinds of materials are coated.

In recent years, demand for clad plates has been widening widely in the technical field that requires not only case parts such as computers, cameras, mobile phones, but also traditional metal plates such as automobiles and kitchen utensils, and accordingly, Researches are being actively carried out.

The above-described items in the "background art" are intended to aid understanding of the background of the present invention. Among the described items, those which are not known to the person skilled in the art .

It is an object of the present invention to provide a method for continuously producing a clad sheet material.

According to an aspect of the present invention, there is provided a method of continuously manufacturing a clad sheet material, comprising the steps of: pretreating a plate material unwound from a coil; spray coating a different material on the plate material; .

After the rolling process, the step of finishing the plate material in the form of a coil may be further included. The plate material may be steel or a non-ferrous metal plate such as aluminum, titanium, magnesium, and the like. The pretreatment step may include at least one selected from a preheating process, a breaching process, and a pickling process.

In the spray coating step, the coating material may be a single metal, a mixed metal, or a metal alloy in the form of powder. In the spray coating step, the spray gun may be positioned on one side of the plate material and spray coating powder may be coated on the one side. In the spray coating step, at least two spray guns may be positioned on the front and back surfaces of the plate material to spray the coating powder onto the front surface and the back surface, respectively. At least two spray guns may spray the coating powder on one side of the plate to control the thickness of the coating. In the spray coating step, at least two spray guns are used, and the kinds of coating powder sprayed from the spray guns may be all different.

The particle size of the coating powder used in the spray coating may be 1 to 200 탆. The particle size of the coating powder may be 5 to 50 탆. In the spray coating, a coating powder is used, and the coating powder can be collected and reused after coating.

The rolling process may be a warm rolling process. The warm rolling step may be carried out at 100 ^o C to 600 ^o C. The rolling process is a cold rolling process, and a heat treatment process can be performed before performing the rolling process. The heat treatment process may be carried out at 100 ^o C to 600 ^o C. The method may further include removing dust on the surface of the plate after performing the coating and before performing the rolling. The dust can be removed with compressed air. The rolling step may be performed at least twice.

The present invention is capable of mass production of a clad sheet material which is continuously coated with heterogeneous or triplet materials which can not be made by conventional methods, and the thickness of the coating can be easily adjusted from several micrometers to several hundreds of micrometers.

In addition, since the present invention uses a low-temperature spray coating method, it is easy to diversify the coating material and control the components.

The rolling process makes it possible to produce high-performance plate materials with excellent bonding strength, high hardness, low porosity and excellent corrosion resistance and abrasion resistance compared to conventional low-temperature spray coatings.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. here

i) The shape, size, ratio, angle, number, operation, etc. shown in the accompanying drawings are schematic and may be modified somewhat. ii) Since the figure is shown by the observer's line of sight, the direction and position of the figure can be variously changed depending on the position of the observer.

iii) The same reference numerals can be used for the same parts even if the drawing numbers are different. iv) If 'include', 'have', 'done', etc. are used, other parts may be added unless '~ only' is used. v) can be interpreted in a plurality of cases as described in the singular. vi) Comparison of numerical values, shapes, sizes, and positional relationships are interpreted to include normal error ranges even if they are not described as 'weak' or 'substantial'. vii) The term 'after', 'before', 'after', 'and', 'here', 'following', etc. are used, but are not used to limit the temporal position. viii) The terms 'first', 'second', etc. are used selectively, interchangeably or repeatedly for the sake of simplicity and are not construed in a limiting sense. ix) If the positional relationship between two parts is explained by 'on', 'on top', 'under', 'next to', etc. Other parts may be intervening. X) parts are referred to as '~ or', parts are interpreted to include not only a single part but also a combination, but when parts are connected to '~ or', parts are interpreted only by themselves.

Low temperature spray device

FIG. 1 is a schematic view of a low-temperature spray apparatus equipped with a powder preheating apparatus according to a preferred embodiment of the present invention, and FIG. 2 is a schematic view of the powder preheating apparatus of FIG.

1 and 2, the low temperature spray apparatus 100 equipped with the powder preheating apparatus according to the present invention includes a gas control unit 10 for controlling the supply amount of the supplied gas, a gas control unit 10 A powder feeder 30 for feeding a part of the gas by controlling the supply amount of the gas control unit 10 to supply the coating powder, A mixing chamber 50 for mixing the coating powder supplied to the feeding apparatus 30 and the gas heated by the gas heater 20 and a mixing chamber 50 for mixing the powder fed from the mixing chamber 50 and the powder feeder 30, A powder preheating device 40 for preheating the coating powder supplied to the powder preheating device 40 and a control part 60 for controlling the temperature by controlling the powder preheating device 40 and the gas heater 20. [ Reference numeral 70 denotes an injection nozzle.

The gas control unit 10 controls the supply amount of the gas. That is, the main gas 11 to be moved is moved to the gas heater 20, and a part of the gas 13 is moved to the powder feeder 30. The gas heater 20 heats the main gas 11 supplied through the gas control unit 10 and transfers it to the mixing chamber 30.

The powder feeder 30 refers to a device for feeding a coating powder. And transfers the coating powder to the powder preheating device 40 using the gas supplied from the gas control part 10. 2, the powder preheating apparatus 40 includes a housing 41 installed between the powder feeder 30 and the mixing chamber 50, a heating unit 42 mounted to the housing 41, An apparatus 43 and a coating powder transfer tube 45 formed in a screw shape in the housing 41 to transfer the coating powder. The heating device 43 is for heating the inside of the housing 41 and is preferably provided as a resistance line to perform resistance heating. That is, indirectly heating the coating powder conveyed to the powder conveying pipe 45 through heat generation of the resistance wire.

The powder transfer pipe (45) is formed in the housing (41) at least five turns in a screw shape. The residence time of the coating powder in the housing 41 becomes long through the shape of the screw of the powder conveying pipe 45. The preheating of the coating powder conveyed along the powder conveying pipe 45 is performed through the indirect heating through the resistance wire of the housing 41. [ The material of the powder feed pipe 45 is preferably made of stainless steel for preventing high temperature corrosion. The pre-heated coating powder through this powder transfer tube (45) is transferred to the mixing chamber (30). The powder preheating device (40) and the gas heater (20) are subjected to temperature control through the control part (60). The control unit 60 may be a computer.

The mixing chamber 50 mixes the preheated coating powder with the main gas. The coating powder mixed with the main gas and the main gas are injected into the coating object 71 through the mixing chamber 50 to be coated.

The operation of the low-temperature spray apparatus having the powder preheating apparatus according to the present invention having the above-described structure will be described.

A powder preheating device (40) for preheating the coating powder is mounted between the powder feeder (20) supplying the coating powder and the mixing chamber (50). The powder preheating device 40 is provided with a screw-shaped powder feed pipe 45 through which the coating powder is fed. The residence time of the coating powder conveyed through the powder conveying pipe 45 becomes longer and the coating powder is preheated through the heating device 43 of the housing 41 in which the powder conveying pipe 45 is mounted. The preheated coating powder is mixed with the main gas in the mixing chamber 50 and sprayed onto the coating object 71 such as a substrate through the spray nozzle 70 to be coated. By preheating the coating powder, a high laminating ratio and an excellent coating layer can be obtained. That is, since the low-temperature spraying process is basically a process of laminating by plastic deformation of the material, the laminating ratio and the coating property are improved as the toughness of the coating material increases. Also, toughness increases as the temperature rises. Therefore, by preheating the coating powder before coating and using it for coating, high lamination rate and excellent coating layer can be obtained under the same low temperature spray process condition.

The low-temperature spraying process according to the embodiment of the present invention is a solid-state process, so that the powder component can be maintained as it is. Especially, it is possible to coat copper or titanium (Ti) There are advantages.

Clad sheet material manufacturing method

3 is a schematic diagram for manufacturing a heterogeneous material clad sheet material.

Referring to FIG. 3, a non-ferrous metal plate such as steel, magnesium, aluminum, titanium, or the like is first unwound from a coil to perform a pretreatment process before coating. The pretreatment process may include at least one of preheating, bleaching, pickling.
The coating performed after the pretreatment process is a low temperature spray process using the cryogenic spray apparatus shown in Figs. The low-temperature spray gun is placed on one side of the sheet material or on the front and back sides of the sheet material, and the coating powder is sprayed to enable heterogeneous or three kinds of coatings. In addition, two low-temperature spray guns can be connected in front to control the thickness of the coating layer, or one side can be coated with two different materials.

delete

Coating powder is used in coating. The particle size of the coating powder may be about 1 to 200 [mu] m. If it is less than 1 탆, there is a problem that the particle size is relatively small and the amount of not directly spraying on the sheet material is relatively large. On the other hand, if it exceeds about 200 탆, there is a problem that the adhesive strength is lowered. For the same reason, the optimum particle size is 5 to 50 탆. The coating powder can be recovered after coating and reused, thus reducing the production cost. The coating powder may be a single metal, a mixed metal or a metal alloy. For example, iron, stainless steel or a powder of a nonferrous metal such as aluminum, magnesium, titanium or the like, or a mixed powder thereof.

After the coating, it is warm rolled and rolled again in coil form. The hot rolling is performed at a temperature of about 100 ^° C to about 600 ^° C depending on the material. This is because the tissue loosening phenomenon is insignificant at a temperature below 100 ^oC and deterioration of the base material and coating layer at a temperature higher than 600 ^oC . If necessary, at least two rolling operations can be performed.

The purpose of hot rolling is to improve the surface roughness, to densify the internal coating texture, and to improve the bond strength between the base material and the coating. Since the low-temperature sprayed structure is a plastic deformed structure, the possibility of cracking at the time of rolling at room temperature is high, so the hot-rolled steel sheet must be rolled and the structure must be loosened before rolling. Alternatively, cold rolling may be performed instead of hot rolling, but in this case, a heat treatment process must be performed in such a manner as to pass through the heat treatment furnace first. Here, the temperature at the heat treatment is preferably about 100 ^o C to about 600 ^o C for substantially the same reason as the hot rolling.

In addition, it is possible to remove dust on the surface of the plate before performing the coating after the coating is performed. In order to remove the coating powder remaining in the form of powder or dust around the plate, it is effective to use compressed air .

Experimental Example

Powders having a particle size of 5 to 45 μm, titanium powder, 3 mm in thickness, 50 mm in width and 100 mm in length, were coated with magnesium (Mg) and stainless steel by the low-temperature injection process shown in Table 1 below. Before coating, brazing was performed to remove surface oxidation scale. The low-temperature spraying process is characterized in that a powder preheating device is implemented between the powder feeder and the coating gun. In this experiment, the powder preheating temperature was set at 300 ° C.

[Table 1]

FIG. 4 is a photograph of a titanium cross-sectional structure taken on a magnesium base material coated with the experimental conditions of Table 1. FIG. In this case, titanium coated with stainless steel shows a similar cross-sectional structure and the porosity of the coating is about 3%.

The low temperature spray coating specimens were rolled immediately after the heat treatment. Rolling was carried out immediately after the heat treatment in order to give a warm rolling effect simultaneously with rolling and heat treatment.

Table 2 below shows the change in hardness before and after rolling and the result of measurement of the bonding force before and after rolling in Table 3 below. [Table 2] shows similar hardness values before and after rolling at 200 ^° C and 300 ^° C, but after rolling at 400 ^° C and 500 ^° C, the hardness increases remarkably. In Table 3, the bond strength of rolled specimens after heat treatment at 400 ^° C and 500 ^° C is increased by more than 50%.

[Table 2]

[Table 3]

FIG. 5 shows the cross-sectional structure after rolling, and the porosity of the coating decreased by about 100% to 1.5%. As described above, the special clad sheet according to the material such as corrosion resistance and abrasion resistance is continuously produced by the reduction of the coating porosity, the increase of the coating hardness and the increase of the coating cohesion ability by the heat treatment rolling or the warm rolling after the low temperature spray coating, It is possible.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that various modifications and changes may be made in the present invention.

FIG. 1 is a schematic view of a low-temperature spray apparatus equipped with a powder preheating apparatus according to a preferred embodiment of the present invention.

FIG. 2 is a schematic view of the powder preheating apparatus of FIG. 1. FIG.

FIG. 4 is a photograph of a titanium cross-sectional structure taken on a magnesium base material coated under predetermined experimental conditions.

5 is a photograph of a cross-sectional structure after rolling.

Claims

Pretreating the plate unwound from the coil;

Spraying a dissimilar material by performing a low-temperature spraying process on the plate material using a low-temperature spray device; And

And performing a rolling process on the spray coated sheet material.

The continuous clad sheet material manufacturing method according to claim 1, further comprising: after the rolling process, finishing the plate material in the form of a coil.

The method for continuously manufacturing a clad sheet material according to claim 1, wherein the plate material is a steel or nonferrous metal plate.

The method according to claim 1, wherein the pretreatment step includes at least one of a preheating process, a breaching process, and a pickling process.

The method of claim 1, wherein the coating material in the spray coating step is a single metal, a mixed metal, or a metal alloy in powder form.

The continuous clad sheet material manufacturing method according to claim 1, wherein, in the spray coating step, the spray gun is positioned corresponding to one surface of the plate material and spraying coating powder onto the one surface.

The continuous clad sheet material manufacturing method according to claim 1, wherein, in the spray coating step, at least two spray guns are positioned on the front and back surfaces of the plate material to spray coating powder on the front surface and the back surface.

The method according to claim 1, wherein in the spray coating step, at least two spray guns spray coating powder on one surface of the plate to adjust the thickness of the coating.

The method of manufacturing a continuous clad sheet material according to claim 1, wherein, in the spray coating step, at least two spray guns are used and the kinds of coating powder sprayed from the spray guns are all different.

The method for continuously manufacturing a clad sheet material according to claim 1, wherein the particle size of the coating powder used in the spray coating step is 1 to 200 탆.

The method according to claim 10, wherein the particle size of the coating powder is 5 to 50 탆.

The method according to claim 1, wherein the coating powder is used in the spray coating step, and the coating powder is collected after coating and reused.

The method according to claim 1, wherein the rolling process is a warm rolling process.

The method of claim 13, wherein the clad plate manufacturing method is carried out continuously in the warm rolling step is 100 ^o C to 600 ^o C.

The method according to claim 1, wherein the rolling step is a cold rolling step,

And performing a heat treatment process before performing the rolling process.

The method of claim 15, wherein the clad sheet continuous manufacturing method performed in the heat treatment step is 100 ^o C to 600 ^o C.

The method of claim 1, further comprising removing dust on the surface of the plate after performing the coating and before performing the rolling.

18. The method according to claim 17, wherein the dust is removed by compressed air.

The method as claimed in claim 1, wherein the rolling is performed at least twice,