JPS581021A - Method and apparatus for annealing semicontinuous open coil - Google Patents

Abstract

PURPOSE:To anneal an open coil in a short time and with small heat loss, by use of a small-sized equipment, by winding a metallic band plate to a lengthwise direction part together with a spacer in the forward and reverse directions from the front and the rear, and executing its heat treatment in order, in a furnace. CONSTITUTION:A tight coil 10 wound to a reel 1 is rewound, its end part is welded to a lead coil by a welding machine 15, and about 1/4 of the coil 10 is wound 20 onto a reel 2. In this case, a strip 100 and a spacer 5 stretched between two pairs of spacer feeding and winding devices 6, 6 pass through between pillars 4 vertically provided on a turntable 3 in an inner cover 8 of a furnace 7. Subsequently, the turntable 3 is rotated clockwise, and 1/2 of the coil, and the spacer 5 are heated by an extension part 9, are wound, and are annealed in the furnace 7. After annealing has ends, the strip 100 is dried and cooled by the extension part 9, is wound to the reels 1, 2, and furthermore, the remaining 1/2 of the coil is anneal-processed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a semi-continuous oven coil annealing method and its apparatus, and more particularly to a semi-continuous oven coil annealing method and its apparatus which overcome the drawbacks of the box-type annealing method and the continuous annealing method.

Conventionally, in order to perform open coil annealing, a box-shaped annealing furnace and a dedicated coil rewinding device were installed separately, and the tight coil was inserted between metal strips (hereinafter sometimes referred to as strips) using the coil rewinding device. (J called loose coil or oven coil is bright annealed in a box-shaped annealing furnace such as a bell-shaped annealing furnace.)

Decarburization annealing, gas alloying, denitrification annealing, etc. were performed.

However, one drawback of the conventional oven coil annealing method is that when rewinding from a tight coil to an oven coil using a rewinding device, the outer diameter of the oven fill is limited by the inner diameter of the inner cover of the bell-shaped annealing furnace. The weight limit varies depending on the outer diameter of the wire etc. inserted between the strips, but
For example, if you make an oven coil with the same diameter as a tight coil, the weight will be about 20%.

In addition, since the size of a tight coil is generally 8, there are some parts that cannot be converted into appropriate oven coil units, resulting in incomplete fills and poor yield.

In addition, the inner cover and actor cover of a conventional box-type annealing furnace are both movable, so one or more coil stacks are built on a fixed coil support, and the inner cover and outer cover are sequentially placed on top of the fixed coil support. After sealing, the inside of the inner cover is purged with gas and heated and annealed, then the actor cover is removed and the inner cover is heated with a fan.1)
Because the process of forced air cooling was used, oven coil annealing had a wider heat receiving and cooling area than tight coil annealing, but the overall thermal efficiency was low and it took a long time. That is, the conventional box type annealing method requires a separate coil winding device and requires the movement of a force bar, and has the problem that the process is generally complicated.

Furthermore, in order to eliminate the drawbacks of the box-type annealing furnace mentioned above, a continuous annealing method is generally used, and recently even soft swim-drawing copper plates such as automobile plates have come to be manufactured using continuous annealing equipment. Ta. However, in a high-speed continuous annealing furnace,
In order to change the composition of metal strips such as decarburization, denitrification, and gas alloying, a huge internal volume of the furnace is required, which makes the various equipment huge and difficult to control, making it difficult to put into practical use. At present, it is close to impossible.

Therefore, the present inventors installed a pillar turntable (coil support stand) in a fixed box annealing furnace and partially rolled up the 9 tubes to perform open coil annealing semi-continuously. Heading, Invention I: Reached.

The purpose of the present invention is to provide a semi-continuous oven coil annealing method that can omit a coil rewinding device, requires a much more compact device than a continuous annealing method, and is more productive than a box annealing method. We are in the process of providing equipment.

Another object of the present invention is that the device used has a relatively simple structure and doubles as a coil rewinding device, and also has a soaking zone and a heating and/or cooling zone separated.
It is an object of the present invention to provide a semi-continuous oven coil annealing method with easy operation control and an apparatus therefor.

Semi-continuous oven coil annealing, in which the metal strip is rolled up into the furnace in the longitudinal direction (partially in the longitudinal direction) and subjected to the next heat treatment. a pair of coil winding and unwinding devices, a spacer feeding and winding device which is a disc that also serves as a diffuser and is rotatable about a vertical axis, and a furnace body that encloses at least the coil support stand and the partial coil. A semi-continuous oven coil annealing apparatus is provided.

The present invention will be described in detail below using Examples.

1 to 5 are process diagrams of an embodiment of the present invention.

First, as shown in FIG. 1, the tight coil 10 wound on the reel 1 is unwound, the end portion is welded to the lead coil by the welding machine 15, and, for example, the tight coil 10 is wound onto the reel 2. FIG. 2 shows the state in which the coil has been unrolled.

At this time, the strip 100 is attached to a pair of columns 4 vertically erected on a coil support stand (hereinafter also referred to as a turntable) 3.
, 4. Note that the spacer 5 is stretched between the two pairs of spacer supply and winding devices 16, 6, and passes between the pair of pillars 4, 4.

Next, the coil support is rotated clockwise while generating pack tension by the reels 1 and 2, and the strip is simultaneously wound from the reels 1 and 2 into the inner cover 8 of the coil receiving furnace 7.

That is, FIG. 3 shows a state in which about A coil in the longitudinal direction is wound into the furnace. At the same time, a spacer 5 is wound between the strips to provide an appropriate gap between the plates through which the annealing atmosphere can pass.

On the other hand, the inside of the inner cover 8 is previously heated to around the soaking temperature. , and the radial extensions 9, 9 of the inner cover 8 have also started heating in advance. Therefore, the strip is rapidly heated during the process from FIG. 2 to the state shown in FIG. 3. The bar coil is then given the necessary soaking time. During this time, a normal annealing atmosphere such as jet HNX gas is applied, and the bamboo coil is open-coil (decarburized) annealed. The annealing atmosphere is forcibly circulated by a fan at the bottom of the center of the coil support, and an appropriate amount of CO2 is supplied.
, HxO balance is maintained and a decarburization cycle is provided. When the preset soaking time is over, the extension parts 9, 9
Both will function as cooling zones.

That is, as shown in FIG. 3, immediately after the winding of the coil is completed, the extension portion 9.9 stops heating, and the coil that has undergone open coil annealing is transferred to the reel, 1, 2. When it starts to be rolled up again, so-called gas jet cooling, water spray, water immersion or water immersion.
rapidly cooled by contact with cold rolls or other means;
dried. When it is difficult for these extension parts 9, 9 to be used for heating, drying, and cooling, a pair of heating extension parts and a pair of drying and cooling extension parts can be prepared and used interchangeably.

It is also possible to perform heating only in the furnace body surrounding the turntable without using the extension part at all, so that the extension part has only the function of drying and cooling.

The spacer supply and winding device basically consists of a pair of electric reels arranged on the front and back surfaces of the strip. When winding the coil into the furnace, these electric reels feed the spacer while applying an appropriate back tension to the spacer, and conversely, when winding the coil back out of the furnace, the stripping speed at that time is adjusted. Synchronize with (? Wind up the spacer.Then, the spacer is reused, but after an appropriate number of reuses, in the state shown in Figure 1, it is wound up on one of the electric reels and a new spacer is supplied. Therefore, it is desirable that the spacer reel is removable.The spacer may be made of stranded wire made of heat-resistant steel, a wire mesh, a narrow metal band with irregularities formed by pressing, or the like.

Other spacer feeding and winding devices include the pillar 4.4 above.
It is also possible to provide a groove 50 in the vertical axial direction for each spacer, and to arrange block members 7'751+51 at the upper and lower ends of the groove to move the spacer in the vertical direction (see FIG. 9).

This way, in the radial direction between the strips.

It is possible to prevent two spacers from overlapping at the same time, and it is also possible to replace the spacers. 11 The groove 50 can also be fitted with a lid.

Having thus completed the open coil (decarburization) annealing of the dedicated coil, the coil support is rotated counterclockwise and the strip is wound up at the same speed by the reel 1.2. During the drying and cooling process, two inner cover extensions 9,
It goes without saying that 9 is given to the strip. FIG. 4 shows the state in which the reel 1.2 has finished winding up the strip.

Next, as shown in FIG. 5, the metal strip is rolled up and transferred to the reel 2 side, and the rear half of the coil is annealed in the same manner as an open coil. Finally, all the coils l supplied to reel 1 as unannealed coils are wound up on reel 2 as annealed coils, and shear a! 116, and then the coil 2o is transported out. Note that the facing spacer to which the metal strip moves is, in principle, stopped.

Alternatively, you can move the spacer separately and update it at this time.

Comparing the heat cycle of the open coil annealing method according to the above embodiment of the present invention with that of the conventional box annealing method,
For example, as shown in Figure $6, the total annealing time can be greatly shortened.

Note that the annealing atmosphere includes HNNe in the example,
Inert gas such as Ar, vacuum, etc. are also applicable.

The metal strip is generally a copper strip made of soft steel, stainless copper, etc., but it may also be a metal strip made of other special steel or non-ferrous metal such as Cu, AN, or an alloy thereof. Further, in this embodiment, the coils were annealed, but it goes without saying that all the coils can be annealed at once.

The method of the present invention (invention 1) for unhusking rice is as described above.
), Next, the present invention device (present invention 2) will be described in detail below using examples.

FIG. 7 is a plan sectional view of an embodiment of the device of the present invention.

The up-end coiled tight coil 10 attached to the reel 1 is wound back to form a strip 1o.

Tonari, welding s15, tension device 11 on the entry side,
It enters the inner cover extension part 9 via the tension controller 12, seal, and roll 32, and further passes through the seal roll 31 and enters the inner cover 8, and then the coil support 3.
The reel 2 passes through a pair of pillars 4.4 erected in the center, passes through the seal roll 31 on the exit side, the inner cover extension 9, the seal roll 32, the tension controller 12, the tension device 11, and the shearing machine 16. It has a structure that can be rolled up.

On the outside of the inner cover 8, a large number of burners 30 are arranged approximately radially at the bottom, and an actuator whose inner surface is coated with a refractory material.
Cover 14 covers it. Note that both the outer cover 14 and the inner cover 8 can be attached and detached using a crane. However, there is no need to remove and install these except during maintenance. Further, the heating device for the actor cover 14 may be a radiation heating tube instead of the burner 30, or an electric heating device using a resistance heating element. In addition, it is also possible to conduct electrical resistance heating or induction heating by supplying electricity to the tube 9 itself. Other heating means include a direct flame heating type non-oxidizing furnace, which is limited to a power ζ atmosphere.

Further, in the inner cover 8, a coil support 3 having a pair of vertically fixed columns 4, 4 is arranged near the center.

FIG. 8 is a front sectional view of the embodiment of the apparatus of the present invention shown in FIG.

The rotatable coil support 3, which also serves as a diffuser for atmospheric gas, is supported by a tapered roller bearing at its lower outer periphery and is driven by a drive shaft 17 fixed to the lower center thereof. The drive shaft 17 is further driven by a drive device 40 consisting of a motor with a reduction gear. Further, a base fan 13 rotated by an electric motor is provided in the center of the coil support base 3, and atmospheric gas is circulated within the inner cover 8, so that the atmospheric gas can sufficiently flow through the coil gap during annealing. The pillars 4, 4 may be cantilevered as in this embodiment, but they will be stronger if they are connected at the top in an inverted U shape. The extension part 9 of the inner cover 8 has an even number of water-cooled rolls arranged in a staggered manner on both sides of the strips 11 and 100 inside thereof, and the strips 10
0 can be cooled down. In addition, a so-called jet cool device that blows dry atmospheric gas with an extremely low dew point cooled by a cooler (not shown) using a powerful blower from a nozzle onto both sides of the strip 100 to cool the strip 100 is used. After annealing, the slip is rapidly dried and cooled.

It goes without saying that the inner cover 8 is insulated from the outside air by the lower seal mechanism 1B. reel 1
, 2 are drive devices 4 each consisting of a motor with a reduction gear located underground.
1.42. The driving and tensioning of the strip is done by a tensioning device 11.11 on the exit side and the tensioning by a tension controller 12.12.
) 9m is cleared.

By carrying out the present inventions 1 and 2 described in detail above, all of the above objects can be achieved and the following effects can be obtained.

(1) Semi-continuous oven coil annealing can be performed using a relatively small furnace device such as a box-type annealing furnace. Therefore, the processing time is much shorter than the box type annealing which involves the process of changing the coil. The heat cycle itself is also shortened.

(Since no separate 9-coil winding device is required, the equipment becomes compact.

is possible.

■ Yield is improved because there are no odd coils.

[Brief explanation of the drawing]

Figures 1, 2, 3rd animal, 40th. FIG. 5 is a process diagram of an embodiment of the method of the present invention, FIG. 6 is a graph comparing conventional box-type baking, and FIGS. 7 and 8 are a plan sectional view and a front sectional view of an embodiment of the apparatus of the present invention, respectively. 9 is a conceptual diagram showing another embodiment of the spacer feeding and winding device. 1.2...Reel, 3...
Coil support stand, 4... Pillar, 5.
...Spacer, 6...Spacer feeding and winding device, 7...Furnace, 8...
・Inner cover, 9...extension part, 10,
20... Coil, 11... Tension device, 13... Pace fan, 14...
...Actor cover. 30...Burner, 40...Roll support drive device, 50...Groove,
51...Block, 100...Strip. Patent applicant: Toyo Kohan Co., Ltd.

Claims (1)

[Scope of Claims] Semi-continuous oven coil annealing characterized in that, in an open coil annealing method carried out by performing the following steps, a metal strip is partially wound in the longitudinal direction from the front to the back in a forward and reverse direction in a furnace and sequentially heat-treated. Law. (2) The annealing method according to any one of claims 111 to 2, wherein the substrate is a stranded metal wire or an inert gas. (4) The metal strip is a steel strip, the incineration air according to any one of claims 1 to 3, and the primary heat treatment is decarburization annealing. The annealing method described in Range 881. (6) a pair of coil winding and unwinding devices, and a disk device that also functions as a diffuser that can rotate around a vertical axis;
A semi-continuous open coil annealing device comprising a continuous feeding and winding device, and a furnace body that encloses at least the coil support and a partial coil. (7) The annealing apparatus according to claim 6, wherein the furnace body consists of an inner cover and an outer cover with a seal interposed therebetween. (8) The inner cover has a pair of radial extensions passing through the actor cover, each of which is a heating and/or drying/cooling mechanism for the metal strip. The annealing device according to any one of item 7. −