JP2000107871A - Production of clad metal plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and easily produce a clad material having the extremely low plastic deformation quantity of a material to be joined and not having the defect of intermetallic penetration by activating and treating joining faces in vacuum bath, overlapping the joining faces, coiling them on a rotatable cylinder with imparting tension and joining them. SOLUTION: A backup member is preferably coiled to the outside of a band like metal sheet to be cladded which is coiled on the faces of bridle rolls 4a, 4b and a free rotating roll 8. An activation treatment is done by ion etching and adhering an activation metal. A material to be treated is coiled out of a metal foil coiling out devices 5a, 5b, is activated with ion sources 2a, 2b and is coiled together with the backup member from backup member coiling out devices on the faces of the bridle rolls 4a, 4b and the free rotating roll 8. A product is coiled to a take up device 7 and is held at a normal temp. to <=350 deg.C by a heating device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a method of manufacturing a clad metal plate in which thin strip-shaped metal plates to be clad are joined together by overlapping in the thickness direction.

[0002]

2. Description of the Related Art As a method for producing a clad metal sheet, there are a roll joining method by cold or hot rolling, an explosion welding method,
Methods such as a brazing method, a welding method, and a bonding method, and a method of combining them are known. Among these, the cold rolling joining method is adopted for relatively thin clad metal plates. In this cold rolling joining, a relatively high rolling reduction is generally required, and accordingly, there is a problem that a large-size and precision rolling is required. Therefore, in order to reduce the rolling ratio, a method of mechanically polishing the surface to be joined and reducing the product of the time until the rolling after the polishing and the oxygen partial pressure in the atmosphere to a certain value or less ( JP-A-59-92186) and ion-milling treatment of a surface to be joined to activate the surface to be joined (JP-A-61-286078).

[0003] However, these proposals are directed to a relatively short metal plate, not to a strip-shaped clad metal plate, and have a problem in production efficiency.
There are also problems such as being affected by molecules other than oxygen. Japanese Patent Publication No. 7-55384 discloses that in order to solve these problems,
A method has been proposed in which a surface to be joined is activated by sputter etching in a glow discharge plasma under specific conditions in a specific vacuum range, followed by cold rolling.

[0004]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Publication No. 7-553.
The method proposed in No. 84 is based on the cold rolling joining method,
In the case of a metal foil with a thickness of 50 μm or less, the effect of intermetallic intrusion in which the mating metal penetrates into the surface to be bonded becomes particularly large, and when the material to be bonded is thin, In the case of joining at a high rate, the rolling equipment is increased in precision and size, and it is technically difficult to perform this in a high vacuum, and there is a problem of reduced economic efficiency due to the increase in size. Therefore, the present invention provides a clad metal plate and a method for manufacturing the same, which are highly efficient, can be easily carried out, and do not rely on rolling, so that the amount of plastic deformation of the material to be joined is extremely small, there is no problem of penetration between metals, and the method is easy to carry out. That is the task.

[0005]

The inventor of the present invention has found that, particularly in the case of joining in a vacuum, the joining condition is greatly affected not by the compressive stress value between the two materials but by the duration thereof and the diffusion treatment after the joining. It was inferred from various phenomena that it was also affected by friction between both materials. From this viewpoint, when examining the cold rolling joining method described above, the polymerization joining time in the joining method is as follows:
Since it is limited to a very narrow plastic deformation area at the roll entrance, if the joining time is to be lengthened,
The roll diameter increases as the workpiece becomes thinner, and the equipment cost increases, and the rolling speed, that is, the productivity, decreases.Also, in the example of the multi-layer rolling performed in cold rolling of Al foil or the like. As you can see, the friction between the materials to be joined is almost zero,
It is assumed that the effect of improving the joining by friction cannot be expected.

The present invention has been conceived from the above-described viewpoint, and a bonding surface of at least a part or all of at least two strip-shaped metal plates to be clad is previously activated in a vacuum chamber. Thereafter, the method is a method for manufacturing a clad metal plate, wherein the joining surfaces are superimposed and joined while being wound with tension on a rotatable cylindrical surface. In the present invention, the diffusion treatment after bonding, that is, after bonding on the cylindrical surface, further strengthening the bonding force by maintaining the temperature at room temperature or more and 350 ° C. or less, continuous with the bonding on the cylindrical surface. It is desirable that the wire is wound by a winder and that the temperature is maintained at a temperature not lower than room temperature and lower than or equal to 350 ° C. on the winder to enhance the bonding strength. The holding temperature is determined depending on the combination of the materials to be joined. Generally, the temperature is preferably room temperature or higher, more preferably 100 ° C. or higher, and still more preferably 150 ° C. from the viewpoint of strengthening the bonding strength. On the other hand, the temperature is desirably 350 ° C. or lower from the viewpoint of suppressing deformation and structural change of the joined product.
In the case of Cu—Ni bonding, 180 to 200 ° C. is appropriate. In addition, the clad band-shaped metal plate is a rotatable cylinder by directly winding between at least two rotatable cylinders, that is, reducing the number of rolls, and at least two rolls wound on the cylindrical surface It is effective to further wrap the backup member around the outer periphery of the clad band-shaped metal plate to increase the pressure of the contact surface between the materials to be joined and to improve the bonding strength and the processing speed.
In addition, it is desirable that the activation treatment of the surface to be joined is at least one of making the surface a new surface by ion etching, and attaching an activated metal to the surface.

[0007] In the present invention, the contact surface pressure between the materials to be joined required for joining is determined by a band-shaped metal plate wound on a cylindrical surface or a backup member wound further around the outer periphery of the metal plate. This is due to circumferential tension (corresponding to hoop stress in material mechanics). The circumference of the winding (the product of the radius of the cylinder and the center angle of the winding) should be much larger (several times to tens of thousands of times) than the plastic deformation area at the entrance of the rolling roll in the rolling joining method. Thereby, the polymerization bonding time can be extended or the processing speed can be increased. Also,
Since the amount of plastic deformation applied to the materials to be joined only needs to be sufficient to collapse the microscopic contact portion between the two materials and increase the contact area, the amount of plastic deformation is much smaller than that of the roll joining method, and therefore, the work hardening is almost Negligible, the need for strain relief annealing is eliminated, and the inconvenience of intermetallic penetration is eliminated. Further, in the roll joining method, it is necessary to accurately control the distance between the rolls in a high vacuum, whereas in the present invention, the tension of the metal material to be joined on the rotatable cylindrical surface is set to a predetermined value or more. It only needs to be held, which is easy even in high vacuum. Further, in the present invention, friction can be generated between the upper layer and the lower layer under the stress from the difference in the winding circumference on the rotatable cylindrical surface to contribute to the joining operation.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a first embodiment of the present invention in the case of joining metal foils. However, the present invention relates to relatively thick metallic materials,
Alternatively, the present invention can be applied to joining of a metal foil and a relatively thick metal material. The vacuum vessel 1 has a power of 10 ⁻³ to 10 ⁻⁶ To
a vacuum degree of rr, and unwinding devices 5a, 6a, 5b, and 6b provided in the inside thereof, one each for a metal foil and a backup member, and two ion sources 2
a, 2b, a pair of guide rolls 3a, 3b provided opposite to the ion source, a rotatable cylindrical idle roll 8, and a pair of front and rear bridle rolls 4a, 4b and a heating device 9, respectively. There is provided a series of devices including a winding device 7 provided with the device.

[0009] The above-mentioned series of devices processes and arranges materials to be processed as follows. The unwinding devices 5a and 5b for the metal foil and the unwinding devices 6a and 6b for the electrically insulating backup member which is the washi paper added in the present embodiment include:
A first bridle roll described later is applied to the material to be unwound.
A braking device (not shown) is provided so as to unwind while maintaining a tension higher than the slip does not occur on 4a (contact center angle θ1). The pair of guide rolls 3a and 3b are wound around a pair of the metal foil and the backup member unwound from the unwinding device, respectively, so that the backup member is a lower layer and the metal foil is an upper layer, and the direction is changed. The two ion sources 2a and 2b remove the obstacles to the bonding by removing the oxide film and the like on the surface to be bonded by ion etching the outer peripheral surface of the upper metal foil on the guide rolls 3a and 3b. I do. However, instead of the above-described ion etching, an activated metal released from a target (not shown) may be attached to the activation target surface. At this time, the temperature of the metal foil can be in the range of room temperature to 350 ° C. The effect of increasing the temperature of the material to be joined includes an increase in joining strength due to higher activation and diffusion, etc., and a decrease in the temperature of the high-temperature material to be joined on the idler roll 8, resulting in contact due to shrinkage. This is due to an increase in bonding strength due to an increase in surface pressure. Guide rolls 3a, 3
A permanent magnet, a DC or AC electromagnet, or the like may be provided inside b to perform control such as uniforming or concentrating spatter by a leakage flux.

Next, the material to be treated such as a metal foil is placed on the bridle roll 4 so that the surfaces of the metal foil activated as described above are mutually bonded.
a, superposed on the idler roll 8 and the bridle roll 4b, and wound and bonded at winding center angles θ1, θ8 and θ3, respectively. The operation of each of these rolls will be described later. The metal foil and the like that have exited the bridle roll 4a, the idler roll 8, and the bridle roll 4b are wound by the winding device 7 under heating. At this time, the winding tension is the bridle roll 4b (contact center angle θ3). Above, the slip is not generated. Even on the drum of the winding device, the metal foils receive the diffusion bonding action under heating and the contact surface pressure between the metal foils due to the tension, thereby enhancing the bonding strength. At this time, the lower the layer, the greater the contact surface pressure is accumulated,
Also, since the duration is long, the bonding is strengthened. The winding coil is carried out immediately after winding or after being held for a predetermined time.

Next, the operation of the bridle roll 4a, the idler roll 8, and the bridle roll 4b will be described. The second bridle roll 4b is driven by applying a torque Tr necessary to maintain a predetermined tension T1 to the material to be treated at the entrance, while the first bridle roll 4a is driven by the material to be treated at the exit. Is given a braking force of a torque Tr ′ necessary to maintain the tension T1. As a result, the material to be processed on the idler roll 8 having the diameter d has a winding center angle θ.
In the range of 8, a tension T1 is given. At this time, the contact surface pressure p between the metal foils in the winding layer on the idler roll 1 and the duration t thereof are: T1: total tension of the metal foil and the backup material (a pair of materials have the same tension), b : Width of metal foil,
d: diameter of idler roll, v: peripheral speed of metal foil etc., p =
T1 / (b · d) and t = d · θ8 / (2 · v).
From these equations, the contact surface pressure p and the joining time t are in inverse proportion according to the diameter d of the idler roll 8, and the contact surface pressure p
It can be understood that the bonding time t can be increased by reducing the value of. Further, a bridle roll pair may be provided at the entrance of the winding device 7 so that the material to be wound in the winding device 7 has a high tension, thereby strengthening the joining force.

In this embodiment, the bridle rolls 4a and 4b are provided immediately before and immediately after a rotatable cylindrical idle roll 8, and the tension required for joining is limited to the rotatable cylindrical idle roll portion. To stabilize the material to be treated and to simplify the equipment, but the tension may be applied to the entire area from the unwinding device to the winding device. Not only the tension of the backup member but also the contact surface pressure between the metal foils on the rotatable cylindrical surface is increased to strengthen the bonding, and the bonding metal foil on the winding drum of the winding device 7 is improved. The surface of the guide rolls 3a and 3b in the case of processing a narrow metal foil is protected by using an electrically insulating tape-like material as a backup member, which is intended to prevent scratches due to direct contact between them.
Although it has features such as highly activated by ion etching, these can be appropriately selected in the present invention.

Next, FIG. 2 is a view for explaining a second embodiment, in which two bridle rolls 11, 12 are used as rotatable cylinders, and a band-shaped metal plate to be clad is directly wound between them. Then, the idle roll 8 of the first embodiment described above.
Is an example in which is omitted. Bridle rolls 11 and 12 having diameters d1 and d2 are provided, and the tension of the material to be treated is inlet (total); Ti, between the rolls; T1, and outlet; Also, the second
The bridle roll 12 is driven to rotate at a torque corresponding to the tension T1-To, and the first bridle roll 11 is
It is braked with a torque commensurate with 1-Ti. At this time, the tension of the material to be treated on each bridle roll is equal to the entrance tension Ti for the first bridle roll 11 during the central angle θ1i.
And increases from Ti to T1 during the central angle θ1o (T1 = Ti · ^eμθ ). In the second bridle roll 12, the tension T1 between the bridle rolls during the central angle θ2i.
, And decreases from T1 to To between the central angles θ2o (T1 = To ・^eμθ ). Therefore, the bonding mainly proceeds between the central angles θ2i where the tension is large.

Next, FIG. 3 illustrates an example other than FIG. 1 in which a heating and holding chamber is provided in the case where a bonding force is strengthened by diffusion bonding after winding and bonding with tension onto a rotatable cylindrical surface. FIG. In general, the bonding strength can be improved by several times by holding the diffusion bonding at 200 ° C. for 10 minutes. Note that the holding atmosphere is not necessarily required to be in a vacuum as long as unnecessary oxidation can be prevented. However, it is desirable to be able to avoid the interruption of the vacuum state which interrupts the main joining operation by the apparatus shown in FIG. Each heating and holding chamber can be held at a temperature of, for example, 200 ° C. by a heater, a radiant heat source, or the like (not shown). A is a straight line type. B extends the diffusion bonding time by horizontally or vertically (illustrating) a plurality of idlers having a diameter of about 1000 times or more the thickness of the material to be processed.
The material to be processed, which has been wound by the above method, is skewered and held on the stem 15 while holding the core 16.

[0015]

Next, as a metal foil to be joined, a thickness of 15 μm,
The data of an example in which Cu and Ni foils having a width of 100 mm are joined by the apparatus described with reference to FIG. Vacuum chamber pressure 8 × 10
^-4 Torr. , Tension Ti is 2.4 kgf (1.2 kgf each), idler roll diameter 200 mm, temperature of activated metal foil about 200 ° C., processing speed 50 cm / sec.
The bonding time is 0.6 seconds, and the diffusion bonding between the metal foils proceeds by keeping the temperature in the winding device at 200 ° C. for 10 minutes, and the uppermost winding layer is bent 180 °. A sound bond without peeling was obtained in the test.

[0016]

As described above, the method for producing a clad metal plate of the present invention is based on the finding that the joining time, especially in a vacuum, is greater than the contact surface pressure value, rather than the contact surface pressure value. In this method, after a clad band-shaped metal plate is previously activated in a vacuum chamber, the joining surfaces are superimposed and joined in a state of being wound with tension on a rotatable cylindrical surface. For this reason, even when the material to be joined is processed at a high peripheral speed, a sufficient joining time can be secured, and a product having no metal-penetration can be easily manufactured technically with a simple device. Further, in the present invention, after joining on the cylindrical surface, the joining force can be further strengthened by holding at a temperature equal to or higher than room temperature on a winding device or the like.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a first embodiment of the present invention.

FIG. 2 is a view for explaining a second embodiment of the present invention, and is a view for explaining an example in which a clad band-shaped metal plate is directly wound between two rotatable cylinders.

FIG. 3 is a diagram illustrating an example other than FIG. 1 in which a heating and holding chamber is provided in a case where a bonding force is strengthened by diffusion bonding after winding and bonding with tension on a rotatable cylindrical surface according to the present invention. It is.

[Explanation of symbols]

1; vacuum vessel, 2a, 2b; ion source, 4a, 4b, 11,
12; bridle roll, 3a, 3b; guide roll, 5
a, 5b; metal foil unwinding device, 6a, 6b; backup member unwinding device, 7; winding device, 8;
9; heating device, 13; guide roll, 14; idler, 1
5; stem, 16; winding core, θ: contact center angle, T: tension, d: diameter

Claims (6)

[Claims] In a vacuum chamber, a bonding surface of at least a part or all of at least two clad strip-shaped metal plates is activated beforehand, and then the bonding surface is superimposed on a rotatable cylindrical surface. A method for producing a clad metal plate, comprising: joining a clad metal plate while winding it with tension. 2. The method for manufacturing a clad metal sheet according to claim 1, wherein after the bonding on the cylindrical surface, the temperature is further maintained at a temperature not lower than room temperature and not higher than 350 ° C. 3. The method for producing a clad metal sheet according to claim 1, wherein the joining is performed on the cylindrical surface, and the winding is carried out by a winding device, and the temperature is kept at a normal temperature or higher and 350 ° C. or lower on the winding device. 4. The method for producing a clad metal sheet according to claim 1, wherein the band-shaped metal sheet to be clad is wound directly between at least two rotatable cylinders. 5. The method for manufacturing a clad metal sheet according to claim 1, wherein a backup member is further wound around an outer periphery of at least two band-shaped metal sheets to be clad wound on a cylindrical surface. 6. The activation process according to claim 1, wherein the activation process is at least one of ion etching and deposition of an activation metal.
6. The method for producing a clad metal plate according to any one of items 1 to 5.