JPS6317556B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a metal composite strip by rolling, and in particular to a method for preventing seizure between the work roll of a rolling mill and the composite strip.

Conventionally, a method of stacking a plurality of metal strips together and rolling and crimping them using a rolling mill involves, for example, a pair of upper and lower work rolls 2, 2' and a pair of backs that support them, as shown in FIG. Atsuprol 3,3'
A metal base strip 6 and a metal clad strip 7 whose bonding interfaces have been cleaned in advance are continuously supplied from feeding devices 4 and 5 to a four-high rolling mill 1 consisting of a four-high rolling mill 1, which is stacked and rolled. A method is known in which both strips 6 and 7 are crimped together to form a composite strip 8, which is then wound on a winding device 9.

However, when manufacturing a composite strip using a rolling mill such as the one described above, it is necessary to keep the bonding interface between the metal base strip 6 and the metal clad strip 7 clean, so this method is not used when simply rolling a single metal strip. It was not possible to cool the work rolls 2, 2' by pouring lubricating oil onto the machined surfaces of the work rolls 2, 2' of the rolling mill 1, which was currently being used, and rolling and crimping were performed without lubrication or cooling. ing. Therefore, when rolling and crimping are carried out continuously, the work rolls 2, 2' and the composite strip 8
Seizing occurred between the two, which not only deteriorated the surface condition of the composite strip 8 but also reduced dimensional accuracy. Further, when seizure occurs, it is necessary to temporarily stop the rolling and pressing operations and re-polish the work rolls 2, 2'. For these reasons, conventionally manufactured composite strips have been limited to short lengths, resulting in extremely poor productivity.

In view of this, as a result of various researches, the present invention has developed a manufacturing method that can stably manufacture long composite strips with good surface conditions and high dimensional accuracy. In the production of metal composite strips in which metal strips are piled up and rolled in a rolling mill to press the metal strips together, the work roll surface of the rolling mill is heated in a solvent with a boiling point of 20 to 80 degrees Celsius at 120 degrees Celsius.
This method is characterized in that rolling is performed while cooling with a cooling fluid containing 1 to 20 Vo% of the above lubricating oil.

This will be explained in detail using the drawings.

Figure 2 shows a pair of upper and lower work rolls 2, 2' and a pair of back-up rolls 3, 3' that support them.
Fig. 3 shows an example of the present invention using a four-high rolling mill 1 comprising a pair of upper and lower work rolls 2, 2'. In both cases, supply devices 4 and 5 are shown.
The metal base strip 6 and the metal clad strip 7, whose bonding interfaces have been cleaned in advance, are continuously supplied from the metal base strip 6 and the metal clad strip 7, which are overlapped and rolled by the rolling mill 1, thereby forming both strips 6, 7.
It is the same as the conventional method to press the work rolls 2 and 2' to form a composite strip 8 and wind it up using the winding device 9, but in the present invention, the work rolls 2 and 2' are soaked in a solvent with a boiling point of 20 to 80°C. 1 to 20 Vo% of lubricating oil with a boiling point of 120℃ or higher
It is cooled by the added cooling liquid. The surfaces of the work rolls 2 and 2' are usually heated to a temperature of 80° C. or higher due to the heat generated by both the strips 6 and 7 during rolling, but are cooled by vaporization of the solvent in the cooling liquid. In addition, the lubricating oil in the cooling liquid remains and adheres to the surfaces of the work rolls 2, 2', forming a thin film, and the work rolls 2, 2' and both strips 6, 7, the work rolls 2, 2' and the back-up roll 3, Ensure lubrication between 3'.

The temperature of the work rolls 2 and 2' can be controlled by the type and amount of the solvent in the coolant, and the lubrication state can be controlled by the type and amount of lubricating oil in the coolant. In order to keep the temperature of the work rolls 2 and 2' as low as possible, it is better to use one with a low boiling point and a large heat of vaporization, but those with a boiling point lower than room temperature are difficult to store, and those with a high boiling point are It is preferable to have a boiling point of 20 to 80°C since it remains on the roll surface and has an adverse effect on rolling and crimping.For practical purposes, it is desirable to have a low odor, toxicity, etc. From this point of view, solvents such as ethyl alcohol (boiling point 78.3℃), trichlorofluoromethane, and Freon-11 (boiling point 24℃) are used as solvents.
°C), 1,1,2-trichloro-1,2,2-trifluoroethane, such as Freon-113 (boiling point 48
℃) is good.

As the lubricating oil, machine oil, cylinder oil, other animal or vegetable oil, or mineral oil used in normal rolling may be used.
In order to reliably form a thin oil film even when heated to around 120°C, use one with a boiling point of 120°C or higher. The concentration of lubricating oil added to the solvent varies depending on the rolling conditions, but the oil film formed on the surfaces of the work rolls 2 and 2' needs to be thin and uniform to the extent that it does not contaminate the joint interface between the two strips 6 and 7. There is. but
If it is less than 1 Vo%, the oil film will be thin and uneven, which may cause seizure between the work rolls 2, 2' and the two strips 6, 7. If it exceeds 20 Vo%, the joint interface between the two strips 6, 7 will be contaminated. Rolling and crimping become impaired.

Also, since it is necessary to keep the solvent completely vaporized on the inlet side of both strips 6 and 7 of the work rolls 2 and 2', it is preferable to apply the cooling liquid on the exit side of the composite strip 8 of the work rolls 2 and 2'. . In this way, the rotation of the work rolls 2, 2' causes the composite strip 8 to
While moving from the outlet side to the inlet side of both strips 6, 7, the solvent removes vaporization heat from the surfaces of the work rolls 2, 2' and evaporates.

What is shown in FIG. 2 is a cooling liquid-impregnated cloth 10, 10', such as a woven cloth or fibrous cloth impregnated with a cooling liquid, in sliding contact with the exit side surface of the composite strip 8 of the work rolls 2, 2'. A non-woven fabric or a sponge-like porous body is provided, and the cooling liquid adhering to the work rolls 2, 2 removes heat of vaporization from the surface and evaporates, forming a thin film of lubricating oil on the surfaces of the work rolls 2, 2'.
Note that 11 and 11' indicate pipes for supplying the cooling liquid to the cooling liquid impregnated cloths 10 and 10'.

Also, what is shown in Fig. 3 is the work roll 2,
A jacket 12, 1 is placed on the exit side surface of the composite strip 8 of 2'.
2' are brought into sliding contact through a silicone rubber packing 13, and the cooling liquid is circulated within the jackets 12, 12' to directly cool the work rolls 2, 2'. As in the case of Fig. 2, the cooled liquid also absorbs vaporization heat from the surfaces of the work rolls 2 and 2' and evaporates.
A thin film of lubricating oil is formed on the surfaces of the work rolls 2, 2'.

In Figures 2 and 3, 14 and 14' indicate the intake ports provided on the inlet sides of both the strips 6 and 7 of the work rolls 2 and 2', and the solvent vaporized on the surfaces of the work rolls 2 and 2' is kept at a low temperature. In order to prevent dew condensation on the surfaces of both strips 6 and 7, contaminating the joint interface between both strips 6 and 7, and damaging the working environment due to vaporized solvent, solvent vapor is quickly exhausted outside. belongs to.

Next, examples of the present invention will be described.

Example 1 In the method shown in FIG.
The outer diameter of the work roll 2' is 100 mm and the length is 500 mm, and the outer diameter of the back-up roll is 500 mm and the length is 500 mm. Apply 2Vo% machine oil to ethyl alcohol on the exit side surface of the composite strip 8 of the work rolls 2 and 2'. Cloth piece 1 impregnated with cooling liquid at a rate of 3 c.c. per minute
0,10' and a thickness of 3 mm and a width of 150 mm.
A copper strip of 1 mm thick and a width of 140 mm was introduced as a metal base strip 6 and a silver strip with a thickness of 1 mm and a width of 140 mm was laminated together as a metal clad strip 7, and rolled at 50% in one pass to form a composite strip of 2 mm thickness with a length of 200 m. Manufactured.

When we measured the variation in the thickness of this composite strip, we were able to obtain an extremely high dimensional accuracy of ±0.05 mm, and a smooth finished surface with no defects such as burn-in on the surface. Further, this composite strip was further rolled while repeating normal annealing to obtain a composite strip with a final thickness of 0.8 mm, which was then punched and used for electrical contacts. It was confirmed that this electrical contact had stable performance without peeling at the composite interface.

Although an example was described in which the coolant-impregnated cloth was brought into sliding contact with the work roll surface, similar results were obtained when the coolant-impregnated cloth formed into a roll strip was pressed against the work roll surface and rotated.

Example 2 In the method shown in FIG.
2' has an outer diameter of 500 mm and a length of 500 mm, press a jacket 12 on the exit side surface of the composite strip 8, seal it with a silicone packing 13, and add 20V of turbine oil (JISK-2202, No. 2) to Freon-11. Example 1: Refluxing the added cooling liquid at a rate of 20% per minute
Rolling and crimping was carried out in the same manner as in . Results Example 1
In this method, the rolling speed was 3 m/min, but according to this method, good composite strips were obtained even when the rolling speed was increased to 20 m/min.

As described above, according to the present invention, it is possible not only to effectively cool the work roll and form a thin film of lubricating oil on the roll surface to prevent seizure between the work roll and the composite strip, but also to prevent the compression of the composite interface. is strong,
It has remarkable effects such as being able to obtain products with excellent dimensional accuracy.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a conventional manufacturing method of composite strips, FIG. 2 is an explanatory diagram showing an example of the manufacturing method of the present invention,
FIG. 3 is an explanatory diagram showing another example of the manufacturing method of the present invention. 1...Rolling mill, 2, 2'...Work roll, 3,
3'... Backup roll, 4, 5... Supply device, 6... Metal base strip, 7... Metal clad strip, 8
...Compound strip, 9... Winding device, 10, 10'...
Cooling liquid impregnated cloth, 12, 12'...jacket, 1
4...Intake port.

Claims (1)

[Scope of Claims] 1. In manufacturing a metal composite strip in which a plurality of metal strips whose bonding interfaces have been cleaned are layered and rolled in a rolling mill so that the metal strips are crimped together, the work roll surface of the rolling mill is heated to a boiling point. 20~80℃ solvent, boiling point 120
1. A method for manufacturing a metal composite strip, which comprises rolling while cooling with a cooling liquid containing lubricating oil at a temperature of 1 to 20 Vo% at a temperature of 1 to 20 Vo%. 2. A method for manufacturing a metal composite strip according to claim 1, wherein the work roll surface is cooled by measuring the exit of the metal strip. 3. A method for manufacturing a metal composite strip according to claim 1 or 2, wherein the work roll is cooled by bringing a cooling liquid-impregnated cloth into sliding contact with the work roll surface. 4 Slide the jacket onto the work roll surface,
3. The method of manufacturing a metal composite strip according to claim 1 or 2, wherein the work roll is cooled by circulating a cooling liquid within the jacket. 5 As a solvent, one or more of ethyl alcohol, trichlorofluoromethane (CCl ₂ F ₂ ), 1,1,2-trichloro-1,2,2-trifluoroethane (CCl ₂ FCClF ₂ ) Claims 1, 2, and 3 that use a mixture
A method for producing a metal composite strip as described in paragraph or paragraph 4. 6. The metal composite according to claim 1, 2, 3, 4, or 5, wherein an intake port is provided near the work roll on the inlet side of the metal strip to exhaust solvent vapor. Method of manufacturing strips.