JPS61204339A - Continuous heat treatment of metallic coil - Google Patents

Abstract

PURPOSE:To prevent the deformation of a thin metallic coil and to obtain a treated coil of high quality by successively bringing the coil to be treated into close contact with cylindrical rolls to transfer s heat when the coil is continuously annealed or hardened. CONSTITUTION:A metallic coil of <=about 0.15mm thickness is uncoiled and conveyed in an annealing furnace 1 in the direction of arrows through cylindrical rolls 4for heating and cylindrical rolls 5 for cooling. At this time, the rolls, 4, 5 are rotated, the outer tubes 7 of the rolls 4 are uniformly heated to the annealing temp. with heaters 8, and the outer tubes 14 of the rolls 5 are uniformly cooled by injecting cold water into the rolls 5. The metallic coil is successively brought into close contact with the surfaces of the heated and cooled rolls and the rolls are rotated so as to enable conveyance under small tension, so the deformation of the coil due to tension and thermal deformation is prevented. Thus, the entire coil is uniformly annealed or hardened.

Description

DETAILED DESCRIPTION OF THE INVENTION (Support) Field of the Invention The present invention relates to a continuous heat treatment method for metal coils, particularly for annealing or hardening thin metal coils having a thickness of α15% or less.

(b) Background of the Invention Conventionally, annealing and hardening of metal coils has been done using a batch method in which coils are stacked and heated, and a catenary method has been used for continuous processing.
Although the 0-ting method etc. has been implemented, the thickness difference αls%
For the following thin coils, it is very difficult to perform metal annealing and quenching in a furnace when the batch method is mainly a 1-1 catenary or a 70-ring method.

(C) Purpose of the Invention This invention heats and cools the metal coil by closely transferring it to a rotating cylindrical roll, and corrects deformation of the metal coil due to conveying tension and thermal expansion on the roll surface. The purpose of the present invention is to provide continuous heat treatment for a metal coil that eliminates deformation and uniformly anneals or hardens each part of the metal coil.

B) Structure of the invention This invention rotates a cylindrical roll outer cylinder by heating it to a high temperature,
A metal coil is closely transferred to the outer cylinder surface of the cylindrical roll to perform heat transfer and temperature increase, and then a metal coil is closely transferred to the cooled rotating cylindrical roll outer cylinder surface and cooled, and the metal coil is annealed, or The present invention is characterized in that it is a continuous heat treatment method for metal coils, in which the metal coil heated to the quenching temperature by the heating cylindrical roll is directly fed into a quenching tank and quenched.

(E) Examples of the invention Embodiments of the present invention will be described in detail below based on the drawings.

The drawings show an apparatus for continuous heat treatment of metal coils, Fig. 1 is a schematic side view of an annealing furnace, Fig. 2 is a side view of the quenching part of the quenching furnace, Fig. 3 is a cross-sectional view of the heating cylindrical roll, and Fig. 3 is a schematic side view of the annealing furnace. The figure is a sectional view of a cooling cylindrical roll.

The same reference numerals are given to the same corresponding members in each figure.

In the figure, reference numeral (1) is the furnace body, (2) is the furnace pre-dridle roll, and (3) is the furnace-front priddle roll.

(4) is a heating cylindrical roll, (5) is a cooling cylindrical roll of an annealing furnace, and (6) is a turn roll in a quenching tank (6a) of a quenching furnace.

(7) is an outer cylinder made of heat-resistant steel of the heating cylindrical roll (4), and a heater (8) is attached to the inner wall thereof.

(9) is an insulating material that keeps the heater (8) warm and at the same time prevents heat radiation to the rotating shaft (b).
) is the water-cooled pipe that cools the rotating shaft (b).

(b) is a variable speed electric motor that rotates a cylindrical heating roll.
It is arranged in each heating cylindrical roll (4).

) is the outer cylinder of the cooling cylindrical roll (5), which is connected to the water cooling pipe)
It is cooled by cold water, and the water cooling piping () is provided with fountain holes () in the appropriate places.

αη is a variable speed electric motor that rotates the cooling cylindrical rolls (5), and is connected to the rotating shaft (1) of each cooling cylindrical roll (5).

As configured as described above, the heating cylindrical roll (4) and cooling cylindrical roll (5) of the annealing furnace shown in FIG.
) The rotational speed of each variable speed electric motor (b) αη is adjusted and driven so that the feed speed is the same as that of (b) αη.

The metal coil is Prydle roll (2), F body (1)
The sheets are sequentially passed through the internal heating cylindrical roll (4), the cooling cylindrical roll (5), and the pre-dol roll (3), and at this time, the heating cylindrical roll (4) is also rotated by a brush-energized heater ( 8), the outer cylinder (7) is uniformly heated to the annealing temperature on both sides.

The amount of heat from the heater (8) is mainly transferred to the outer cylinder (7), and the heat is dissipated to the rotating shaft (b) using an insulating material (9) between the heater (8) and the rotating shaft (b). b).

The rotating shaft (6) is injected with cold water from the direction of the arrow through the water cooling pipe (b), cools the brush part, passes through the rotating shaft (b), and cools the rotating shaft (b) in the direction of the arrow. to flow out.

In the cooling cylindrical roll (5), cold water is always injected in the direction of the arrow from the water cooling piping (into the water cooling pipe), and water is sprayed through the water fountain holes drilled at appropriate locations to cool each part of the outer cylinder (14?) equally. ) flows out more.

As described above, the metal coil is brought into close contact with the surface of the roll that is being heated or cooled, and each roll is driven so that it can be transported even under small tension, so deformation of the coil occurs due to transport tension and thermal expansion. Never.

In the quenching furnace shown in Fig. 2, inside the furnace body (1), only the cylindrical heating roll (4) is used to closely heat the metal coil to the quenching temperature and raise the temperature directly from the final heating cylindrical reel (4). Quenching tank (
6a) to the turn roll (6) for quenching,
Turn roll (6)
The metal coil sent to step 3) is straightened on the roll surface so that it will not be deformed and every part will be uniformly hardened.

In the above embodiment, the outer cylinder (7) of the heating cylindrical roll (4) is heated to a high temperature, so heat-resistant steel is used to withstand the high temperature, and the inner wall of the outer cylinder (7) is equipped with a heater (8). )
The outer cylinder (7) is heated to the annealing temperature or quenching temperature, and a heat insulating material (9) is used to prevent heat radiation toward the rotating shaft inside the roll (4). .

The rotating shaft (9) is hollow, and a water cooling pipe is installed inside to inject water to cool the rotating shaft (b) and maintain sufficient mechanical strength.

The cooling cylindrical roll (5) constantly water-cools the outer cylinder (2) and cools the metal coil by absorbing thermal energy from the metal coil.

During annealing, an appropriate number of heating cylindrical rolls (4) and cooling cylindrical rolls (5) are arranged depending on the processing capacity of the metal coil, and the number of rotational drives of each roll (4) and (5) is adjusted accordingly. Attach the variable speed electric motors (b) and (b) to each roll (
4) # Adjust the rotation of (5) to the conveyance speed of the metal coil, and annealing the metal coil with a slight conveyance tension applied so that the metal coil comes into close contact with the surface of each roll (4) I (5). do.

In the case of hardening, the heating cylindrical roll (4) is operated in the same manner as in annealing, and the metal coil heated to the quenching temperature by the heating cylindrical roll (4) is transferred to the final heating cylindrical roll (4).
) to the quenching tank (6&) directly.

(F) Effects of the Invention According to the present invention, since heat is closely transferred to the cylindrical roll during continuous annealing and hardening of a thin metal coil, it is possible to minimize the conveying tension of the metal coil and to reduce the surface of the four-wheel surface. By adhering closely to the metal coil, deformation of the metal coil due to thermal expansion can be corrected, producing high-quality processed coils and ensuring good operation.

[Brief explanation of drawings]

Claims (3)

[Claims] (1) The outer cylinder of a cylindrical roll is heated to a high temperature and rotated, and a metal coil is closely transferred to the surface of the outer cylinder of the cylindrical roll to perform heat transfer and raise the temperature.The cylindrical roll A continuous heat treatment method for metal coils characterized by surface straightening. (2) A metal coil is closely transferred to the surface of the outer cylinder of the heating cylindrical roll to increase the temperature by heat transfer, and then the metal coil is closely transferred to the cooled outer cylinder surface of the rotating cylindrical roll and cooled. A continuous heat treatment method for a metal coil according to claim (1), wherein annealing is performed. (3) A metal coil is closely transferred to the surface of the outer cylinder of the heating cylindrical roll to increase the temperature through heat transfer, and the metal coil, which has been heated to the quenching temperature by the cylindrical roll, is directly sent into the quenching tank and quenched. A method for continuous heat treatment of a metal coil according to claim (1).