JPS6281261A - Production of composite plate - Google Patents

Abstract

PURPOSE:To form the composite material of good quality simply and inexpensively by bonding the mating melt metal with its feeding from the lower part nozzle to the horizontally transfer metal belt which activates the surface and by cooling rapidly thereafter. CONSTITUTION:The steel strip 1 which is fed out from a delivery device 2 is transferred horizontally by being brushed inside non-oxidizing atmospheric casing 5 after the surface being activated by being heated to <=melting point of the metal 13 which becomes the mating metal inside non-oxidizing atmospheric heating furnace 4. The melted mating metal 13 inside the tandish 11 which is maintained on fixed water level by a level detector 17 and valve 16 is flowed out of a nozzle 12 and bonded by being fed on one face of the activated steel strip. It is rapidly cooled by a water cooling roll 7 and wound on a winding device 9. Since this composite plate 1 is combined in direct melting state, the rust generation on the cut surface is prevented with the display of a sacrificial corrosion resistant action of the mating metal and there is no strength deterioration even with its use for long period.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention provides a method for manufacturing a composite plate by combining four types of metals into a metal strip, which enables manufacturing of excellent quality at low cost. It is something.

(Prior art) Generally, it is difficult to impart various properties such as strength, corrosion resistance, heat resistance, electricity, and magnetism to a single material, so when inexpensive materials with various properties are required, Conventionally, composite materials have been used that are made by joining two or more materials that have the desired characteristics or complement each other's characteristics. A typical example of this composite material is clad steel sheets, such as copper clad steel sheets and aluminum clad steel sheets, which are commercially available in large quantities and are used in construction materials, electrical materials, materials for chemical equipment, etc.

Industrial manufacturing of composite plates such as clad steel plates is generally done by rolling and pressure welding, and bonding with adhesives is used for some construction materials that are used at room temperature because it is inexpensive. .

(Problems to be solved by the invention) However, in all of these methods, the laminated material to be joined to the steel plate must be rolled to a predetermined thickness before joining, which increases rolling costs and reduces manufacturing costs. The disadvantage was that it was expensive.

In addition, when manufacturing by rolling welding, it is necessary to first clean the joining surfaces of the steel plates and the joints, and then roll welding. Moreover, after rolling welding, the hardened material must be hardened by diffusion annealing or rolling to increase the joint strength. Since annealing for softening must be performed, the process becomes FII, and the manufacturing cost becomes particularly high.

On the other hand, when manufacturing by adhesive bonding, it is cheaper except for the cost of rolling the laminated material in advance. Therefore, in the case of materials that are used in tens of parts, such as building materials, it is expected that the adhesive strength will decrease due to aging of the adhesive, resulting in a lack of reliability.In addition, products manufactured using this adhesive bonding are similar to steel plates. Since the laminating material is electrically insulated, there is no sacrificial corrosion protection effect of the laminating material on the steel plate.
Rust was likely to occur on the cut surfaces.

For example, in the case of a zinc alloy-plated steel sheet, the steel sheet and the zinc alloy are in a conductive state, so rust will not occur on the cut surface during the cutting period due to the sacrificial anticorrosion effect of the zinc alloy, but this effect does not occur in the case of steel sheets manufactured by adhesive bonding. As a result, rust will occur immediately. This lacks the major feature of composite materials, which is that each material complements the properties of the other materials, and is not desirable as a composite material.

(A thousand r!i to solve problems> The present invention has been developed in view of the fact that the conventional manufacturing method of composite plate has various problems in terms of cost and quality as mentioned above. The present invention provides a method for manufacturing composite plates at low cost.

The inventors of the present invention have conducted various studies in order to develop a method for manufacturing composite plates of excellent quality at low cost. As a result of various studies, the inventors have found that, instead of joining the laminated material to a rolled steel plate as in the past, the composite plate is placed in a molten state. The inventors have discovered that if they are joined together, rolling costs are not required, the process is simple, and the steel plates and the laminated material are not electrically insulated, making it possible to achieve the desired method. After activating the surface in a non-oxidizing atmosphere by heating the metal to be melted to below α in a non-oxidizing atmosphere,
A composite plate is manufactured by supplying molten metal (B), which will become a laminating material, to the metal strip through a nozzle placed in the surrounding air, causing it to adhere, and then immediately cooling it with breath.

The direction of the running force of the metal strip is as shown in the attached drawing, and the nozzle is arranged so that it opens upward.
It is preferable that the entire Ht material metal band is run horizontally above the metal band to supply molten metal to the lower surface of the No. material metal band.

In the present invention, the reason why the heating of the metal strip is kept below the melting point of the metal serving as the laminating material is that if the temperature of the metal strip is higher than the melting point of the metal serving as the laminating material, the laminated material will adhere to the metal strip. This is because the molten metal droops violently, making it difficult to form a relatively thick laminated material required for limited plywood.

The amount of this laminating material attached to the metal strip is a function of the amount of molten metal flowing out from the nozzle, the distance between the nozzle tip and the metal strip, the traveling speed of the metal strip, and the temperature difference between the metal strip and the molten metal. , by adjusting these.

When using a tonal belt as the base metal band, it is preferable to use a metal that has an affinity with the laminating material, for example, one plated with the same metal as the laminating material or a similar metal.

In the case of a bare steel strip, when activating the steel strip with a reducing gas such as dry hydrogen before attaching molten metal, the reducing gas should be as clean as possible, and then the molten metal should be applied to the steel strip. Unless the zone temperature is set above the melting point of the metal so that the reaction is rapid, the ffi and 1 properties with the composite material will not be high, but in order to keep the reducing gas clean, industrial control is extremely strict. This is because the temperature of the steel strip cannot be higher than the melting point of the molten metal due to the sagging of the molten metal as described above.

On the other hand, if a steel strip that has been plated with a metal that has an affinity for molten metal is used, it does not require much activation, so there is no need to highly purify the reducing gas, and the steel strip High adhesion can be obtained simply by heating the molten metal to a temperature close to its melting point.

The plated steel strip may be plated on one side, with the plated only on the surface to which the molten metal serving as the laminating material is attached, but if corrosion resistance is required, a plated steel strip on both sides is used.

Further, if the melting point of the plated metal is lower than the melting point of the molten metal used as the laminating material, the steel strip heating temperature is set lower than the melting point of the plated metal.

If the base metal strip is copper or aluminum, there will be no problems like with steel strips, so there is no need to use plated strips.

Next, an example of manufacturing a composite plate according to the present invention will be explained in detail with reference to the accompanying drawings.

The s4 sheet 1 is unwound from the unwinding device 2, guided diagonally upward, changed its direction vertically by the deflector roll 3, and then passed through the heating furnace 4 to be heated. The heated steel strip 1 is placed in a casing 5 which has a non-oxidizing atmosphere, and is placed in a deflector.
It is run horizontally by the roll 6 and the water-cooled roll 7, and lifted vertically from the casing 5 again by the deflector roll 8.
It is wound up on the winding device 9.

A brush roll 1 ( ) is placed in the casing 5 at the deflector roll 6 to polish and activate the surface of the steel strip 1 . A nozzle 1 is installed on one side of the tundish 11 in the horizontally running part of the A-band 1.
2, and a melted metal 13, which will serve as a joining material, is supplied to the bottom surface of the steel strip 1 from the tip that opens above.
ylT and immediately quenched with a water cooling roll 7.

The amount of molten metal flowing up the /Suru 12 is /(Ru 12).

This is done using a spatula between the tip and the surface of the tandish 11. For this reason, the replenishment furnace 1 is attached to the outer upper blade of the casing 5.
4, and a supply pipe 15 reaching the tundish 11 from the bottom thereof is provided, and the molten metal 13 is supplied to the tundish 1.
A valve 16 is fitted to the outlet of the supply pipe 15, and its opening and closing are performed by the bath surface level detector 17 disposed in the tundish 11. If the bath level drops below the set value, it will be replenished immediately.

EXAMPLES The present invention will be explained in more detail below with reference to Examples.

(Example) Example 1 As the base metal strip, the plate thickness is 0.27+o+n and the width is 927.
+n+n hot dip galvanized steel strip [zinc coating amount 3059/
[F12 (both sides) 1 was used, and a 5% Al Zn alloy composite material was bonded to one side by the method shown in the attached drawings.

For joining, the steel strip is heated to 350"C in a heating furnace 4 while running at 50 + n/min, one side is polished with a brush roll 10 in a casing 5 in a nitrogen atmosphere, and then the polished surface is coated with 77: The molten metal of the above alloy at 130°C was supplied from the nozzle 12.When supplying the molten metal, the width of the /glue 12 was set to 900m+n narrower than the width of the steel strip, and the tip of the nozzle 12 and the bath surface of the tundish 11 were The difference between the heads is 30+n+n, and the distance between the tip of nozzle 12 and the steel strip is 1.5.
I chose InIn.

As a result, it was possible to manufacture a composite plate in which F4-sized pieces of about 180μ were bonded together. When the cross-sectional metallographic structure of this composite plate was observed using a microscope, it was found that the base metal galvanized layer and the 5% Al-Zn alloy of the composite material were completely fused together, and a bending test revealed that the adhesion was good. was in good condition.

Example 2 As a base metal strip, i thickness is 0.4CI, width is 927 mun
hot-dip aluminized steel strip (differential thickness plating, surface adhesion amount 50
9/+n2, back side 159/+n2), and a 5% Al Zn alloy bonding material was bonded to the back side in the same manner as in Example 1.

In this embodiment, the steel strip running speed is 40 +n/+nin, and the steel strip heating temperature in the heating furnace 4 is 550'C1/Head difference between the tip of the slurry 12 and the bath surface of the tundish 11 is 1()uu
o, /distance between the tip of the glue 12 and the steel strip 0, 6 +n
+n and join.

As a result, a composite plate with a thickness of about 30μ of laminated material was obtained, and the base material aluminum plating layer and the laminated material had a 5%^1~Zn content.
It was completely fused to the alloy and had good adhesion.

Example 3 Base material metal strip, plate thickness 0.40+nm, 'l'fX
927 "o+++ electrolytic copper plating tone belt (different thickness plating,
^1 (purity 99.9%) was applied to the back side in the same manner as in Example 1, using a coating amount of 109/I02 on the surface and 29/Io2 on the back side.
The laminated materials were joined.

In this example, the steel strip traveling speed is 30 m/+nin, the heating temperature of the heating furnace 4 is 600°C, the temperature of the supply from the nozzle 12 is 710°C, and the tip of the nozzle 12 and the head of the tantine 11 are connected to the bath surface. 315 mm, / Zuru 1
The distance between the tip of No. 2 and the steel strip was pi, 1, and 2 mIo, and the joints were made.

As a result, a composite plate with a bonding layer of approximately 75μ in diameter was produced, and its cross-sectional metallographic structure was observed under a microscope.
The base metal copper plating layer disappeared, and instead an Fe-^1 intermetallic compound of about 1.5 μm was formed at the interface between the steel strip base and the^I laminated material. The thickness of this intermetallic compound is thinner than that of alloy 14 (formed during 18-dip aluminization of steel sheets), so the laminated material does not peel off even in a 180-degree close bending test, and its adhesion is lower than that of aluminized steel sheets. It was good.

Example 4 Base material/krLg band, plate thickness 0.27u+m, width 92
7 tnrn hot-dip galvanized steel strip [plating adhesion'i4
59/+n2 (single side) 1 was used, and a PI3 laminating material was bonded to one side in the same manner as in Example 1.

In this example, the steel strip running speed is 60 +n/+nin, the steel strip heating temperature in the heating furnace 4 is 310°C, the molten PI) temperature supplied from the slurry 12 is 350°C, and the temperature between the tip of the slurry 12 and the bath surface of the tundish 11 is 350°C. Head difference 15++++++++.

/ The distance between the tip of the screw 12 and the steel strip was 0.8+nVl, and the joints were made.

As a result, a composite plate with a thickness of about 90 μ of laminated material bonded was replaced, and 5%^1-Zn of the base aluminum plating layer and the laminated material was replaced.
It was completely fused to the alloy and had good adhesion.

(Effects) As described above, since the composite plate manufacturing method of the present invention joins the laminated materials in a molten state, there is no need to roll the laminated materials in advance, and rolling costs are eliminated. Furthermore, the manufacturing process is simple as it does not require rolling or annealing. Furthermore, since the steel plate and the laminated material are directly joined, the laminated material exhibits a sacrificial anti-corrosion effect, prevents rust from forming on the cut end surface, and does not lose strength even after long-term use. Therefore, according to the present invention, a composite plate of excellent quality can be manufactured at low cost.

[Brief explanation of drawings]

The accompanying drawings show one example of the method for manufacturing a composite board according to the present invention. DESCRIPTION OF SYMBOLS 1... Steel strip, 2... Unwinding device, 3... Deflector roll, 4... Heating furnace, 5... Casing, 6
... Deflector roll, 7... Water-cooled roll, 8.
... Deflector roll, 9... Winding device, 10.
・・Brush roll, 11・・Tandishu, 12・
.../T, Le, 13... Molten metal, 14... Supply furnace, 15... Supply pipe, 16... Valve, 17... Bath level detector,

Claims (3)

[Claims] (1) After heating the base metal strip to below the melting point of the metal used as the laminating material and activating the surface in a non-oxidizing atmosphere, the laminating material is applied to the metal strip through a nozzle placed in a non-oxidizing atmosphere. A method for manufacturing a composite plate, which comprises supplying and depositing molten metal, and then rapidly cooling the metal. (2) The nozzle is arranged so as to open upward, and the base metal strip runs horizontally above the nozzle to supply molten metal to the lower surface of the base metal strip. A method for manufacturing a composite board as described in . (3) When the base metal strip is a steel strip, a plated steel strip made of a metal that has good affinity with the laminating material is used.