JPH01133689A - Manufacture of clad material - Google Patents

Abstract

PURPOSE:To easily manufacture clad material with firm joining by superposing dissimilar metal plates on each other and heating these at the proper temperature in a vacuum or in a regulated atmosphere and subsequently, pressing these continuously by pressing rolls in the vacuum or in the regulated atmosphere. CONSTITUTION:A heating chamber 2 a rolling chamber and a cooling chamber 4 are connected and material 1 to be clad where the dissimilar metal plates are superposed is carried in an airtight vessel provided with a vacuum ventilating opening 10 and a regulated gas introduction port 12 and heated by a high-frequency heating coil 8 in the vacuum or in the regulated atmosphere. At that time, as necessary, metallic foil or metallic fine powder can be interposed between the mutual dissimilar metal plates. In addition, the heating temperature is made to the optional temperature between the room temperature and 1,400 deg.C, for instance, below a solidus temperature of the metal plate with the lowest melting temperature. Afterward, the material 1 to be clad is pressed continuously between the pressing rolls 5 and 6. This pressing is executed at low draft <=30%, for instance. The clad material joined hereby is taken out via the cooling chamber 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a cladding material by bonding superimposed dissimilar metallic materials or gold scrap material and nonmetallic material.

[Conventional technology] The conventional technology for manufacturing cladding materials by joining dissimilar metal plates is as follows:
The explosion bonding method and the rolling method are sb, but the former is dangerous and has low productivity, so the latter is the mainstream.

There are two types of rolling methods: cold rolling and hot rolling. In the former, cold rolling alone does not produce bonding, so post-heat treatment is performed, but the bonding force is insufficient. The latter includes a circumferential welding method and a vacuum packing method.

The circumferential welding method involves welding the circumferential edges of stacked dissimilar metal plates in air or a vacuum atmosphere, and then hot rolling the welded metal plates. This method has many disadvantages due to welding, such as some dissimilar metal plates being assembled that cannot be welded, some materials difficult to weld such as thin plates and metal foils being welded, and welded parts cracking during rolling.

In the vacuum/4'-tuck method, materials to be clad are stacked and placed in a bag-like metal bag, the inside of the bag is evacuated, and the opening of the bag is sealed. This is co-hot rolled in a bag, and after cooling, the bag is cut open and the cladding material is taken out.

This method involves complicated steps such as sealing and opening the bag in a high vacuum state, and has many drawbacks such as the bag material and cladding material joining together depending on the material.

[Problems to be Solved by the Invention] In order to overcome the drawbacks of the prior art and facilitate the joining of dissimilar metal plates, it is necessary to satisfy the following conditions.

(1) The method does not require welding. (2) In order to firmly join dissimilar metal plates, it is necessary to form interatomic bonds at the interface between the dissimilar metal plates. To make this more concrete, the following methods can be considered.

(1) The reason why welding was necessary in the conventional technology is to maintain a vacuum at the joining interface and to apply high pressure rolling during joining, which prevents misalignment of the metal plates and curling due to differences in deformation resistance between materials. be.

In order to eliminate the need for welding, it is necessary to place the joint interface in a vacuum or a controlled atmosphere and to perform small pressure rolling.

(2) In order to bond with a small pressure, the contact surfaces must be smooth, clean, reedy, have low deformation resistance, and the contact surfaces must be familiar with each other to facilitate interatomic bonding.

It is believed that this can be achieved by pressurizing the cladding material with a smooth and clean surface in a vacuum or in a controlled atmosphere at a temperature suitable for bonding.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing a cladding material that can easily form a strong bond between dissimilar metal materials or a metal material and a non-metallic material by small pressure rolling. do.

[Means and effects for solving the problems] In order to achieve the above-mentioned object, the present invention heats dissimilar metallic materials stacked together, or metallic materials and non-metallic materials, to a predetermined temperature in vacuum or in a controlled atmosphere. After heating, the material is continuously pressed and bonded with a pressure roll in a vacuum or in a controlled atmosphere.In this way, pressure is applied in a vacuum or in a controlled atmosphere at a temperature suitable for bonding. As a result, the bonding surfaces of stacked dissimilar metal materials or metal and non-metal materials can be cleaned in a vacuum or in a controlled atmosphere, and are kept at a softening temperature, making it easy to bond between atoms with a small pressure rolling. This allows for a strong bond. In addition, since it is rolled with a small pressure, deformation such as curling does not occur, and good joining can be achieved.

[Example] Embodiments of the present invention will be described in detail below with reference to the drawings.

FIGS. 1 and 2 are block diagrams of an apparatus for carrying out an embodiment of the present invention.

In FIGS. 1 and 2, 1 is a covering material made of dissimilar metal plates made by laminating a base material 15 and a laminate material 16; 2 is a heating chamber;
3 is a rolling chamber, 4 is a cooling chamber, 5 is an upper pressure roll, 6 is a lower roll, 7 is a feed roller, 8 is a high-frequency heated coil, 9 is a material inlet, 10 is a vacuum exhaust port, 11 is a material outlet , 12 is an adjustment gas inlet, 13 is a side warming port, and 14 is a pressure nozzle.

The heating chamber 2, the rolling chamber 3, and the cooling chamber 4 are connected together to form a hermetically sealed container. After evacuation through the exhaust port 10, the metal plate is heated by a high-frequency heating coil 8 in a high-frequency induction furnace to an arbitrary temperature between room temperature and 1400°C, for example, below the solidus temperature of the metal plate having the lowest melting temperature.

A clad material 1 consisting of a base material 15 and a laminate material 16 is sent to the rolling chamber 3 by a feed roller 7 and is continuously pressed between an upper pressure roll 15 and a lower roll 6 at a low rolling reduction rate of, for example, 30% or less. Joined.

During pressurization, the cladding material 1 is maintained at a softening temperature, so the deformation resistance is low, and the mutual contact interface is brought into a state of interatomic bonding with a small pressurizing force, making it possible to form a strong bond. Thereafter, the joined cladding material is cooled to an appropriate temperature in the cooling chamber 4 and then taken out. According to this embodiment, a wide range of different metal plate materials can be combined, and plate thicknesses ranging from thick plates to thin foils can be joined.

For example, if a composite material is made by bonding a thin plate or foil with high hardness and wear resistance to an inexpensive structural material, it will be possible to produce an alternative material for hardening, bonding, surface modification, etc. at low cost. Furthermore, if metal foil or fine metal powder with good bonding properties is interposed between dissimilar metal plate materials, two-piece materials can be manufactured using a wider range of materials.

Depending on the material of the dissimilar metal plate to be clad, a regulating gas such as an inert gas may be introduced into the closed container consisting of a heating chamber, a rolling chamber, and a cooling chamber through the regulating gas inlet 12.
By creating a controlled atmosphere inside the closed container, a cladding material with strong bonding can be easily obtained.

In addition, high-frequency induction heating is a clean heating method that generates little gas, and as the temperature of the cladding material increases, the impurity layer at the interface sag, resulting in a clean metal interface.

Incidentally, in the above embodiment, a case where heating is performed using a high frequency induction furnace has been described, but rapid heating may be performed using a high frequency heating furnace or an image furnace.

In addition to the above embodiments, as stacked dissimilar metal plates,
One or several types of copper, for example, on one or both sides of a metal plate such as iron or iron alloy.

Layering conductive metal plates such as silver and platinum, 300 to 900
After heating to a temperature range of .degree. C., pressure bonding may be performed at a low reduction rate of 30% or less.

Furthermore, in the present invention, a pure aluminum plate or an aluminum alloy plate may be stacked on one or both sides of a steel plate, heated to below the solidus temperature of aluminum, and then press-bonded at a low reduction rate of 30 inches or less. .

In addition, the present invention uses a copper plate as a core material, stacks titanium plates on both sides, heats it to a temperature range of 400 to 1000°C, and press-bonds it with a reduction rate of 30 inches or less, and then stacks a platinum thin plate on the outer surface of the titanium plate. A conductive two-layer board having a five-layer structure may be manufactured by pressure bonding at a rolling reduction rate of 30% or less in a temperature range of 400 to 1000°C.

Furthermore, the present invention may produce a cladding material by overlapping a metal material and a non-metallic material, heating them to below the solidus temperature of the metal material, and then press-bonding them at a low reduction rate of 30 or less. .

In addition, Fig. 3 is an explanatory diagram of the manufacturing method of the clad strip material.
2 shows an upper pressure roll made of a groove-shaped pressure roll, 26 a lower roll made of a groove-shaped pressure roll, 2 a hexagonal rad strip, 22 an elliptical clad strip, and 23 a circular clad strip. That is, one or more sets of groove-shaped pressing rolls 25 and 26 having grooves of an arbitrary shape carved on the outer circumferential surface are installed, and the laminate is pressed at a low rolling reduction rate of 30% or less to form the clad strips 21 to 23 of an arbitrary shape. Manufacture.

Next, the combinations of laminate materials and heating temperatures are shown in the table below.

As a result of manufacturing the cladding material of the present invention using the apparatus shown in FIG. 1, it was confirmed that the bonding was good as shown in Examples 1 and 2 below.

[Example 1] (a) Test material (b) Bonding conditions Atmosphere: In vacuum (degree of vacuum: 10-5 Torr) Heating temperature: 900°C Feed rate: 120 m/min Reduction amount: 0.8-(8%) ( /→Joining result Tensile shear strength 12.4 Y/T2 Microscope observation Good [Example 2] (a) Test material steel plate Material 8841 Dimensions Thickness 8 m Width 80 x Length 300 x Aluminum plate Material Pure aluminum (99,9%) Dimensions Thickness 3!
I11 Width 80m Length 3001@II (b) Bonding conditions Atmosphere In vacuum (vacuum degree 10-5 Torr) Heating temperature 500℃ Feed speed 100+wim in reduction amount
0.5 tm (4.5%) ρ Joint Results Bending Test There was no peeling in any of the front bending, back bending, and side bending tests.

Microscope observation Good Since the bonding surface between the material and the non-metallic material can be cleaned in a vacuum or in a controlled atmosphere and kept at a softening temperature, interatomic bonding can be easily achieved with a small pressure rolling, resulting in a strong bond. In addition, since it is rolled with a small pressure, deformation such as curling does not occur, and good joining can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an apparatus for carrying out an embodiment of the present invention, FIG. 2 is an enlarged block diagram showing an example of the suppression roller section in FIG. 1, and FIG. It is an enlarged configuration diagram showing the other side of the row 2 part. 1... Cladding material made of stacked dissimilar metal plates,
2...Heating chamber, 3...Rolling chamber, 4...Cooling chamber, 5
... Upper pressure roll, 6... Lower roll, 7...
Feed roller, 8... High frequency heating coil, 9... Material inlet, 10... Vacuum exhaust port, 11... Material outlet, 12 River adjustment gas inlet, 13... Temperature measurement port, 14...
- Pressure force adjustment handle. Applicant's agent Patent attorney Takehiko Suzue Figure 2

Claims (7)

[Claims] (1) After heating the stacked dissimilar metal plates to any temperature between room temperature and 1400°C in vacuum or in a controlled atmosphere,
A method for producing cladding materials, which is characterized by continuous pressing and bonding with pressure rolls in a vacuum or in a controlled atmosphere. (2) Claim 1, characterized in that the stacked dissimilar metal plates are stacked dissimilar metal plates with metal foil or fine metal powder interposed between the dissimilar metal plates. A method of manufacturing the described cladding material. (3) The method for manufacturing a cladding material according to claim 1, wherein the heating means is rapid heating using a high-frequency heating furnace or an image furnace. (4) Claims characterized in that among the stacked dissimilar metal plates, the metal plate having the lowest melting temperature is heated to a temperature below the solidus temperature, and then pressed and joined at a low reduction rate of 30% or less. A method for manufacturing a cladding material according to item 1. (5) As the stacked dissimilar metal plates, a metal plate made of an iron alloy with one or several types of conductive metal plates stacked on one or both sides is used. The method for manufacturing the cladding material described in Section 1. (6) After heating the stacked metal material and non-metal material to below the solidus temperature of the metal material in vacuum or in a controlled atmosphere, use a pressure roll in vacuum or in a controlled atmosphere for 30 minutes.
A method for producing cladding materials characterized by continuous pressing and joining at a low rolling reduction of less than %. (7) After heating the stacked dissimilar metal strips to a predetermined temperature in a vacuum or in a controlled atmosphere, they are continuously pressed and bonded with a pressure roll in a vacuum or in a controlled atmosphere to form a cladding of a predetermined shape. A method for manufacturing cladding material, characterized by manufacturing strip material.