KR101278411B1 - Method for manufacturing clad metal product - Google Patents

Abstract

The present invention relates to a method of manufacturing a clad metal, in a method of manufacturing a clad metal by hot rolling after laminating a plurality of plate-like members, at least any one of the first member (P1) or the second member (P2). Forming a graphite coating part on one outer surface, preheating the first member P1 at a temperature of 80 to 200 ° C. for 1 to 5 minutes, and contacting the graphite coating part with the graphite coating part interposed therebetween. Stacking the second member (P2) on both sides of the member (P1), hot rolling the stacked first member (P1) and the pair of second members (P2) at room temperature, and hot rolling It comprises a step of cleaning the prepared clad metal. In the present invention as described above, since the preliminary heating process is performed prior to hot rolling the first member P1 and the second member P2 constituting the clad metal, the clad metal at the same time satisfying the tensile strength, hardness, and thermal conductivity higher than the reference value. The manufacturing time is reduced and the reduction ratio of the manufactured clad metal is improved.

Description

Method for manufacturing clad metal

The present invention relates to a method for producing a clad metal, and more particularly, to a method for manufacturing a clad metal using a preheating and hot rolling.

Recently, along with miniaturization / high performance of electronic products, miniaturization and thinning of each component are required. However, miniaturization or thinning of such components increases the electrical resistance, resulting in the loss of electrical energy, resulting in a drop in electrical conductivity.

For example, in the case of semiconductor components or LED leadframes, they must be made into very compact products, while maintaining a certain level of strength and hardness for physical fixation of the product, and thermal conductivity for heat dissipation. It must be guaranteed.

In order to solve this problem, clad metal is recently used. Clad metal is a combination of dissimilar metals integrally, and is used to improve a problem that cannot be solved by a single material metal. For example, stainless steel is a metal with high corrosion resistance, but has a disadvantage of poor thermal conductivity and localized heating, and aluminum has a disadvantage of being light and excellent in thermal conductivity, but weak in corrosion resistance, compared to other metal materials.

In order to solve this problem, it is common to use clad metal as part of the above-mentioned disadvantages of a single metal by using a heterogeneous metal or a composite metal having different properties.

As a method of manufacturing the clad metal, there are various methods such as casting, sintering, explosion welding, welding, hot welding, rolling, etc. The double hot rolling method is mainly used for various advantages.

In Korean Patent Publication No. 95-4434, pure aluminum or aluminum alloy plates and soft stainless steel sheets are brushed or sandblasted, and then chemically or electrolytically etched to improve the disadvantages of hot rolling. A method for providing a clad metal having significantly improved adhesion without giving a stainless steel work hardening through hot rolling, which is stacked on top of one another and placed aluminum therebetween, is heated.

However, such a hot rolling method has a problem that the production speed is basically low, and when the rolling speed is increased, the rolling reduction rate is lowered, which may cause problems in subsequent processing.

The present invention is to solve the problems of the prior art as described above, the present invention is to satisfy the reduction rate, hardness, strength and more than a predetermined reference value and at the same time improve the manufacturing speed of the clad metal.

According to a feature of the present invention for achieving the above object, the present invention is a method of manufacturing a clad metal by hot rolling after laminating a plurality of plate-like members, at least one of the first member or the second member Forming a graphite coating on one of the outer surfaces, preheating the first member at a temperature of 80 to 200 ° C. for 1 to 5 minutes, and contacting the graphite member with the graphite coating interposed therebetween. Stacking the second member on both sides, hot rolling the stacked first member and the pair of second members at room temperature, and cleaning the clad metal manufactured by hot rolling. do.

In the preheating of the first member, at the same time as the preheating of the first member, the second member is preheated for 1 to 5 minutes at a temperature of 80 ~ 200 ℃.

In the preheating of the first member and the second member, the heating time is set to 2 to 3 minutes when the sum of the thicknesses of the first member and the pair of the second members is 0.3 mm to 0.5 mm, When the sum of the thicknesses of the first member and the pair of second members is 0.5 mm to 1.0 mm, it is set to 3 to 5 minutes.

The graphite coating part is formed on both outer surfaces of the first member and one outer surface of the second member facing the first member.

When the sum of the thicknesses of the first member and the pair of second members is 0.1 mm to 0.3 mm, the graphite coating part is formed to be 0.01 to 0.29 mm, and the sum of the thicknesses of the first member and the pair of second members is 0.3. In the case of mm ~ 0.5mm is formed 0.1 ~ 0.2mm.

The material of the first member is a stainless steel cold rolled sheet, and the second member is copper or a copper alloy.

In the preheating of the first member and the second member, the preheating may be performed by at least one of laser heating and microwave heating.

According to another feature of the invention, the present invention is a method of manufacturing a clad metal by rolling after laminating a plate-shaped metal member, the graphite coating is formed on the outer surface of at least one of the first member or the second member And preheating the first member to a temperature of 80 to 200 ° C. for 1 to 5 minutes, brushing the first member and the pair of second members, respectively, and the graphite coating part therebetween. And laminating the second members on both sides of the first member so as to be in contact with each other, and hot rolling the stacked first members and the pair of second members at room temperature.

The material of the first member is a stainless steel cold rolled steel sheet, the second member is made of copper or a copper alloy, the graphite coating portion both sides of the first member and one side of the second member facing the first member Respectively formed in the graphite coating part, when the sum of the thicknesses of the first member and the second member is 0.1 mm to 0.3 mm, the sum of the thicknesses of the first member and the second member is 0.3 mm. In the case of ~ 0.5mm, it is formed as 0.1 ~ 0.2mm.

In the method for producing a clad metal according to the present invention as described above, the following effects can be expected.

In the present invention, the pre-heating process is performed prior to hot rolling the first and second members constituting the clad metal, while satisfying the tensile strength, hardness and thermal conductivity of more than the reference value while reducing the production time of the clad metal clad manufactured There is an effect that the reduction ratio of the metal is improved.

In the present invention, since the graphite coating is formed on the outer surfaces of the first member and the second member prior to the preheating, the overall thermal conductivity of the clad metal is improved, and the heating speed is improved by effectively absorbing the microwave during the preheating process, and consequently the cladding. The manufacturing speed of metal is effective.

1 is a process diagram schematically showing the configuration of a preferred embodiment of the method for producing a clad metal according to the present invention.
Figure 2 is a process diagram showing the configuration of a second embodiment of a method for producing a clad metal according to the present invention.
Figure 3 is a process diagram showing the configuration of a third embodiment of a method for producing a clad metal according to the present invention.
Figure 4 is a process diagram showing the configuration of a fourth embodiment of a method for producing a clad metal according to the present invention.
Figure 5 is a flow chart illustrating a method for producing a clad metal according to the present invention.
Figure 6 is a data table showing a cross-sectional view of the clad metal produced in accordance with the present invention in the longitudinal direction and the cross-sectional direction, respectively, and experimental values of the hardness measured in each case.

Hereinafter, with reference to the accompanying drawings a specific embodiment of the method for producing a clad metal according to the present invention as described above will be described in detail.

In Fig. 1 the structure of the preferred embodiment of the method for producing a clad metal according to the invention is shown in a schematic process.

As shown in the drawing, the clad metal is basically composed of the first member P1 and the second member P2 coupled thereto, and the first member P1 and the second member P2 are all formed of metal. In the example, the pair of second members P2 are coupled with the first member P1 interposed therebetween. Of course, in some cases, one second member P2 may be coupled to one first member P1.

The first member P1 and the second member P2 are made of a metal material having high hardness, strength, elongation, and thermal conductivity. In this embodiment, the first member P1 is a stainless steel cold rolled steel sheet. Member P2 is made of copper or a copper alloy. For reference, in the following test, the first member P1 was made of STS430 material, and the second member P2 was made of C194 material.

The first member P1 and the second member P2 are wound by the winder 100, respectively, and are subjected to the step-by-step manufacturing process while being released as the winder 100 rotates.

The first member P1 and the second member P2 released from the winder 100 are subjected to a graphite coating process, a brushing process, a preheating process, and a hot rolling process, respectively, and are finally finished with a cleaning process.

In this case, prior to the graphite coating process, the first member P1 and the second member P2 may be washed. The cleaning process is to remove foreign substances such as oil and dust on the surfaces of the members, and to reduce the bonding defects due to the degreasing when joining each member.

The graphite coating process is to coat graphite on at least one or more outer surfaces of the first member P1 or the second member P2, and is made by the graphite coater 200. The graphite coating part is formed on the first member P1 or the second member P2 through the graphite coating process. The graphite coating part not only improves thermal conductivity due to the nature of graphite, but also first member P1. Alternatively, the second member P2 may absorb heat more effectively during preheating through microwaves or the like.

In order to effectively utilize the function of the graphite coating part, in the present embodiment, the graphite coating part is formed on the outer surface of the second member P2 facing both sides of the first member P1 and the outer surface of the first member P1. . The graphite coating part may be implemented by various techniques including sputtering deposition.

Of course, the graphite coating may be formed only on both sides of the first member P1 or on the outer surface of the second member P2 in contact with the first member P1.

In this case, when the sum of the thicknesses of the first member P1 and the second member P2 is 0.1 mm to 0.3 mm, the graphite coating part is formed to 0.01 to 0.09 mm, and the first member P1 and the second member ( When the sum of the thicknesses of P2) is 0.3 mm to 0.5 mm, the thickness is preferably 0.1 to 0.2 mm. This is because when the thickness of the graphite coating is less than a certain value (0.01mm or 0.1mm), the thermal conductivity improvement function by the graphite coating is deteriorated, and when the graphite coating is more than the predetermined value (0.09mm or 0.2mm), This is because a problem that the reduction ratio decreases.

Sum of the thickness of the first member P1 and the second member P2 (mm) Thickness of Graphite Coating Part (mm) 0.1 to 0.3 0.01 ~ 0.09 0.3 ~ 0.5 0.1 to 0.2

As such, the first member P1 and the second member P2 having the graphite coating part are moved to the brushing device 300 for the brushing process. The brushing process is performed by forming a fine unevenness due to scratches on the surfaces of the first member P1 and the second member P2, thereby increasing the interfacial energy of the first member P1 and the second member P2, thereby hot rolling. It serves to promote diffusion at the interface in the process to increase the bonding force between the two metal members.

In the present embodiment, the brushing process is performed by sand blasting, that is, by spraying sand using compressed air, in order to reduce consumable costs in the brushing process.

The first member P1 and the second member P2 that have undergone such a brushing process are moved to the preheating device 400 for the preheating process. The preheating equipment 400 is for preheating the first member P1 and the second member P2 before hot rolling, and the preheating equipment 400 is a laser heating device or a microwave heating device. Or an apparatus that performs both laser heating and microwave heating.

The preheating equipment 400 preheats the first member P1 and the second member P2 at a temperature of 80 to 200 ° C. for 1 to 5 minutes. This means that when the temperature exceeds 200 ° C., oxides that interfere with the joining of the first member P1 and the second member P2 may be formed on the surface. This is because diffusion at the interface is not sufficient.

More specifically, the heating time in the preheating of the first member P1 and the second member P2, the sum of the thickness of the first member P1 and the second member P2 is 0.3. In the case of mm to 0.5 mm, it is set to 2 to 3 minutes, and when the sum of the thicknesses of the first member P1 and the second member P2 is 0.5 mm to 1.0 mm, it is preferably set to 3 to 5 minutes. This is derived through experiments, and corresponds to the optimum conditions for satisfying the strength, hardness, and rolling reduction conditions and not increasing the manufacturing time, depending on the thickness of the first member P1 and the second member P2. .

Sum of the thickness of the first member P1 and the second member P2 (mm) Preheating temperature (℃) Preheating time (minutes) 0.3mm ~ 0.5mm 80-200 2 to 3 0.5mm ~ 1.0mm 80-200 3 to 5

Of course, as shown in Figure 4, this preheating process may be made of only the first member (P1). That is, only the first member (P1) is preheated by passing through the preheating equipment 400, the second member (P2) is a preheating step is omitted, which is the condition of the facility space or the first member (P1) And the thickness of the second member P2.

For reference, although not shown, spot welding may be performed for temporarily fixing the first member P1 and the second member P2 prior to the preheating process. This is to prevent the state in which the first member P1 and the second member P2 are stacked in the preheating process and the hot rolling process.

On the other hand, the order of the brushing step and the pre-heating step may be interchanged. As shown in FIG. 2, the first member P1 and the second member P2 may be brushed through the brushing device 300 after being preheated while passing through the preheating device 400 first.

The first member P1 and the second member P2 which have undergone the preliminary heating process are moved to the rolling roller 500 for hot rolling. The rolling roller 500 is for hot rolling, so that the members can be joined by applying a large pressure and temperature to the members in the course of passing the members between the two rollers which are engaged with each other. do.

의 압력과 100~500℃의 온도 조건하에서 이루어짐이 바람직하다. 압력이 300,000

이하일 경우에는 압하율이 떨어져 접합불량이 많아지고, 800,000

이상인 경우에는 압연롤러(500)의 지름이 그만큼 커져 접합시 집중력이 떨어져 접합불량과 함께 국부적으로 압하율이 일정치 못한 단점이 발생할 수 있다. 온도의 경우에는 100℃ 이하인 경우 열간압연의 효율이 떨어지고, 500℃ 이상인 경우에는 주름 및 접합강도가 크게 떨어지는 문제점이 있다. Hot rolling by the rolling roller 500 is 300,000 ~ 800,000

It is preferably made under the pressure and the temperature conditions of 100 ~ 500 ℃. Pressure is 300,000

If it is below, the reduction ratio decreases, resulting in a large amount of bonding failure, and 800,000

In the above case, the diameter of the rolling roller 500 is increased so much that the concentration force is lowered at the time of joining, which may cause a disadvantage in that the local rolling reduction is not uniform along with the bonding failure. In the case of the temperature is less than 100 ℃ hot rolling efficiency, and when it is 500 ℃ or more there is a problem that the wrinkles and bonding strength is greatly reduced.

Under such conditions, the hot rolled first member P1 and the second member P2 become laminated clad metal and are moved to the cleaning equipment 600 for the cleaning process. The cleaning device 600 performs the function of washing the clad metal to finish.

Next, the process of manufacturing the clad metal through the embodiment shown in FIG. 1 will be described with reference to FIG. 5.

First, the first member P1 and the second member P2 washed by the washing process are coated with graphite. That is, both sides of the first member P1 and one of the second members P2 are coated. Each side is formed with a graphite coating, in which case the second member (P2) is formed only on one side facing the first member (P1).

The first member P1 and the second member P2 on which the graphite coating part is formed are moved to the brushing process. (S110) The brushing process is used to apply fine iron to the surfaces of the first member P1 and the second member P2. Formed to increase the interfacial energy, in the present embodiment is made through sandblasting.

The first member P1 and the second member P2 which have undergone the brushing process are moved to the preheating process. (S120) The preheating process is performed through the microwave heating and the laser heating, and the first member P1 and the second member. By heating (P2), at this time, the heat absorption rate is improved due to the graphite coating portion, the heating rate is increased, and as a result, the time of the preheating process is reduced.

The first member P1 and the second member P2 which have undergone the preliminary heating process are stacked. (S130) More specifically, the second member P2 is disposed on both sides thereof with the first member P1 interposed therebetween. It will be located.

In this state, the first member P1 and the second member P2 are moved to the hot rolling process. (S140) The hot rolling process is performed under the predetermined temperature and pressure. Press P2 so that the first member P1 and the second member P2 are joined.

At this time, the first member (P1) and the second member (P2) is promoted diffusion at the interface due to the fine roughness formed on the outer surface through the brushing process, thereby improving the bonding force.

As such, the first member P1 and the second member P2 are hot-rolled to become a clad metal, and the finished clad metal is finished through a cleaning process (S150). The product may be prepared by the following process.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and those skilled in the art can make various modifications and adaptations within the scope of the claims. It is self-evident.

100: winder 200: graphite coating machine
300: brushing equipment 400: preheating equipment
500: rolling roller 600: cleaning equipment
P1: first member P2: second member

Claims (9)

In the method of manufacturing a clad metal by hot rolling after laminating a plurality of plate-like members,
Forming a graphite coating on an outer surface of at least one of the first member and the second member;
Preheating the first member at a temperature of 80-200 ° C. for 1-5 minutes;
Stacking the second member on at least one side of both sides of the first member so as to be in contact with the graphite coating part therebetween;
Hot rolling the stacked first and second members;
Clad metal manufacturing method comprising the step of cleaning the clad metal produced by hot rolling.
The method of claim 1, wherein in the preheating of the first member, at the same time as the preheating of the first member, the second member is preheated for 1 to 5 minutes at a temperature of 80 ~ 200 ℃, the hot rolling 300,000 ~ 800,000

Clad metal manufacturing method characterized in that the pressure is made under a temperature condition of 100 ~ 500 ℃.
The method of claim 2, wherein in the preheating of the first member and the second member, the heating time is 2 to 3 minutes when the sum of the thicknesses of the first member and the second member is 0.3 mm to 0.5 mm. When the sum of the thickness of the first member and the second member is set to 0.5mm ~ 1.0mm Clad metal manufacturing method, characterized in that set in 3 to 5 minutes.
The method of claim 3, wherein the graphite coating part is formed on both outer surfaces of the first member and one outer surface of the second member facing the first member.
According to any one of claims 1 to 4, wherein the graphite coating portion is formed of 0.01 ~ 0.09mm when the sum of the thickness of the first member and the second member is 0.1mm ~ 0.3mm, the first member and the first If the sum of the thickness of the two members 0.3mm ~ 0.5mm Clad metal manufacturing method characterized in that formed in 0.1 ~ 0.2mm.
The method of claim 5, wherein the material of the first member is a stainless steel cold rolled sheet, the second member is a clad metal manufacturing method, characterized in that the copper or copper alloy.
The method of claim 6, wherein the preheating of the first member and the second member is performed by at least one of laser heating and microwave heating.
In the method of manufacturing a clad metal by hot rolling after laminating a plurality of plate-like members,
Forming a graphite coating on an outer surface of at least one of the first member and the second member;
Preheating the first member at a temperature of 80-200 ° C. for 1-5 minutes;
Brushing the first member and the second member, respectively;
Stacking the second member on at least one side of both sides of the first member so as to be in contact with the graphite coating part therebetween;
Clad metal manufacturing method comprising the step of hot rolling the laminated first member and the second member at room temperature.
The method of claim 8, wherein the first member is made of a stainless steel cold rolled steel sheet, the second member is made of copper or a copper alloy, and the graphite coating part faces both outer surfaces of the first member and faces the first member. It is formed on the outer surface of one side of the second member, respectively, The graphite coating is formed of 0.01 ~ 0.09mm when the sum of the thickness of the first member and the second member is 0.1mm ~ 0.3mm, the first member and the second member Clad metal manufacturing method characterized in that when the sum of the thickness is 0.3mm ~ 0.5mm formed 0.1 ~ 0.2mm.

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