JPH0739920A - Device for heating/supplying slab for planetary mill - Google Patents

Abstract

PURPOSE:To provide a slab heating/supplying device for planetary mills or the like which requires only a small space for installation and is excellent in thermal efficiency and with which surface flaw of slab is reduced. CONSTITUTION:The slab heating/supplying device is a slab heating/supplying device for the planetary mill 1 or the like with which a slab is rolled while receiving continuous supply of the slab of a base stock to be rolled. This device has a walking beam type heating furnace 3 whose slab transporting direction in the heating furnace for feeding the slabs 54-59 in the width direction is arranged at right angles to the rolling direction of a rolling mill and in the furnace on the extraction side of this walking beam type heating furnace 3, a group of hearth rolls 41 with which the slab 53 is continuously supplied in the length direction to the rolling mill.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slab heating device for a rolling mill such as a planetary mill which rolls a slab as a material to be rolled while continuously feeding the slab. The present invention has a small equipment installation space,
Also, a heating device capable of heating a slab with high heating efficiency is provided. Here, the planetary mill is a generic term for a Zenzimer type planetary mill, a plaza type planetary mill, a planetary mill called a roll cast invented in France, and the like.

[0002]

2. Description of the Related Art A planetary mill does not have a force for biting (pulling in) a slab by itself due to a rolling mechanism, and continues rolling while pushing the slab by a feed roll. Therefore, when rolling the rear end of the slab,
The trailing end of the preceding slab needs to be pushed into the mill at the leading end of the following slab driven by the fidroll,
As a result, the slab is completely continuously rolled.

Conventionally, a very long heating furnace (for example, 100M)
The above) is placed in the preceding stage of the planetary mill, the slab is continuously charged from one end of this furnace, and the continuously heated slab is extracted from the other end and supplied to the mill. It was being appreciated. In this heating furnace, a hearth roll is used as a means for transporting the slab, and the slab transported on the rotating hearth roll pushes the front slab to continuously supply the slab to the planetary mill. Was becoming. This hearth roll has a hollow water-cooled or air-cooled structure in order to prevent creep deformation due to use in a high temperature furnace. While passing through this heating furnace, the slab has a predetermined temperature, for example, 1100-1
Heat to 300 ° C. On the other hand, a walking beam type slab heating furnace is known. However, this type of furnace was not used in planetary mills.

[0004]

The above-mentioned conventional type heating furnace has the following problems. Due to the long heating furnace, the required factory space was vast. Since the front and rear parts of the heating furnace were open, heat was often released from this part. Further, inside the heating furnace, there was heat loss due to cooling of the hearth roll portion.
Therefore, the thermal efficiency of the heating furnace as a whole was poor. Due to the contact between the slab and the hearth roll, a flaw may occur on the surface of the slab. Therefore, the surface quality of the steel strip after rolling was deteriorated.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a slab heating and feeding device for a planetary mill or the like, which requires a small installation space, has high thermal efficiency, and has few slab surface flaws. .

In order to achieve the above object, the slab heating and feeding device of the present invention is a slab heating and feeding device for a rolling mill such as a planetary mill which rolls a slab as a material to be rolled while continuously feeding the slab. The walking beam type heating furnace is arranged such that the slab conveying direction in the heating furnace for feeding the slab in the width direction is perpendicular to the rolling direction of the rolling mill, and the extraction side of the walking beam type heating furnace A hearth roll group for continuously supplying the slab to the rolling mill in the lengthwise direction is provided in the furnace.

[0007]

In the slab heating and feeding apparatus of the present invention, the slab is heated while being fed in the width direction in the walking beam type heating furnace arranged at right angles to the rolling line.
The heated slab is sent in the longitudinal direction by the hearth roll group arranged in the extraction side furnace of the heating furnace, is extracted from the heating furnace, and is continuously supplied to the rolling mill.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will be given below with reference to the drawings. Figure 1
It is a figure which shows the equipment arrangement of the slab heating supply apparatus which concerns on one Example of this invention. 1 is a planetary mill, 2 is a mill entrance table, 3 is a walking beam type heating furnace, 4 is a mill exit table, and 51 to 59 are slabs.

The slab is first charged into the walking beam type heating furnace 3 (slab 59, etc.) and heated to a predetermined temperature while being conveyed in the furnace 3 upward in the drawing. In the walking beam type heating furnace, since there is no slip between the slab and the slab transfer beam and the heating efficiency is good, the slab can be heated in a short time and without causing defects such as flaws. The walking beam type heating furnace 3 has an extraction capacity (Ton / Hr) determined by the rolling capacity (Ton / Hr) of the planetary mill, and a heating furnace length determined by the charging / extracting slab temperature.

At the exit side of the walking beam type heating furnace 3, there is a group of hearth rolls 41 for carrying the slabs 53 to 51 in a direction perpendicular to the slab carrying direction of the furnace 3 (from the bottom to the top of FIG. 1). It is provided. A slab is transferred from the walking beam heating furnace 3 to the hearth roll 41 by a slab transfer device described later. Hearth Roll 41
The slab 53 transferred upward is sent in the slab length direction (from right to left in the figure). The slab that has left the walking beam type heating furnace 3 is conveyed on the mill entrance side table 2 so that the trailing end of the preceding slab 51 and the leading end of the slab 52 are in contact with each other, and is continuously supplied to the planetary mill 1. It In the same mill 1, a slab is continuously pushed into a planetary roll by a feed roll and rolled. Same mill 1
The slab rolled in (1) becomes a strip or a bar and is delivered to the mill delivery side table 4. A shutter (extraction door) 5 is provided at the exit of the heating furnace 3 to the mill entrance table 2, and when the heating furnace 3 is heated up, the shutter 5 is closed to prevent heat loss. it can.

FIG. 2 shows the slab heating and feeding device of FIG.
It is the sectional view seen in the -II direction. The walking beam type heating furnace 3 has a box-like structure in which the surroundings are covered with a refractory wall, and a slab 59 is loaded from the loading port 21 at the left end of the drawing, and the slab 59 is transferred at the right end of the drawing. The heated slab is extracted from the part 29. Inside the furnace, from the upstream side to the downstream side (from left to right in the figure) of the slab traveling direction, the pre-tropical zone 23 and the heating zone 2
It is divided into 5 zones and 27 zones and 3 zones. Slab
Preheating, heating, and soaking are performed as each zone is advanced. In addition,
Each zone is equipped with a burner (not shown), and the combustion air of the burner flows from right to left in the furnace,
It is discharged from the flue 22 at the three ends.

Inside the walking beam type heating furnace 3, there is provided a slab transfer device including a fixed beam 31 and a moving beam 33, which are arranged in parallel in the width direction of the furnace.
The fixed beam 31 is provided so as to traverse from the inlet side to the outlet side of the furnace 3 and is a beam that does not move with respect to the furnace 3. Like the fixed beam, the moving beam 32 is provided so as to traverse from the inlet side to the outlet side of the furnace 3. The moving beam 32 moves up and down in the furnace 3 by the mechanism described later.
It cyclically moves forward (rightward), descends, and backwards (leftward) in a loop. By this movement, the slab is conveyed through the furnace 3 from the left to the right in the figure.

The moving beam 32 is a bridge-shaped frame 3
It is supported by 5, and the moving beam 32 moves in a loop as the frame moves up and down and moves back and forth. The frame 35 includes a lever 38 having a roller 37,
It is driven up and down by a lever mechanism including a rod 39 and a moving beam lifting cylinder 34. The progress of the frame 35 is
This is performed by the moving-out / retracting operation of the moving beam feed cylinder 33. That is, the moving beam 32 rises in the retracted position to place the slabs 59 to 54 on the moving beam 32, moves forward from here to convey the slab to the right, and descends in the advanced position to move the slab onto the fixed beam 31. Put. continue,
The moving beam 32 moves backward (to the left) and returns to its original position.

The transfer of the slab from the walking beam in the walking beam type heating furnace 3 to the hearth roll 41 will be described. On the right side of the transfer section 29 of the furnace 3, a plurality of hearth rolls 41 are arranged on an extension of the fixed beam 31. The moving beam 32 conveys the slab 54 onto the hearth roll 41 (slab 53). After that, the slab 53 is conveyed in the planetary mill 1 direction while being kept in a uniform temperature state. The soaking zone 27 of the walking beam type heating furnace 3 is omitted, and the hearth roll 41 is omitted.
The slab may be soaked in the above heating equipment.

FIG. 3 is a diagram showing a slab transfer mechanism from a walking beam to a hearth roll in a slab heating and supply device according to another embodiment of the present invention. The hearth roll 41 is supported by a movable hearth roll drive device 43 that can move in the left-right direction in the drawing. The hearth roll 41 is movable between a position inside the heating furnace 3 (one-dot chain line in the drawing) and a position outside the heating furnace 3 (solid line in the drawing). The hearth roll 41 receives the slab 54 from the moving beam 32 at a position within the walking beam heating furnace 3. Then, the hearth roll 41 is rotated to feed the slab 53 in the mill direction. When not transporting the slab,
The hearth roll 41 goes out of the furnace. By avoiding unnecessary heat load on the hearth roll 41, the roll 4
1 can be protected and heat loss can be avoided.

Also in the slab heating and supplying apparatus of this embodiment, a slab surface defect due to the contact between the slab and the hearth roll may occur, but since the contact time between the two is shorter than before, the defect occurrence can be suppressed to the minimum. Needless to say, rolling with an edger roll or the like can be combined before rolling with the planetary mill.
Further, slab heat retention or heating equipment may be provided on the mill entrance table 2.

[0017]

As is apparent from the above description, according to the present invention, the following effects can be obtained. Most of the slab heating is performed in the walking beam type heating furnace, so that the slab heating can be performed with high thermal efficiency. Since the walking beam type heating furnace can be arranged at right angles to the rolling line, it is possible to install rolling equipment in a narrow space. Since the contact between the hearth roll and the slab can be minimized, the occurrence of slab surface defects during heating can be minimized.

[Brief description of drawings]

FIG. 1 is a diagram showing an equipment layout of a slab heating and feeding apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the slab heating and feeding device of FIG. 1 as seen in a II-II direction.

FIG. 3 is a diagram showing a slab transfer mechanism from a walking beam to a hearth roll in a slab heating and supply device according to another embodiment of the present invention.

[Explanation of symbols]

1 Planetary mill 2 Mill entry table 3 Walking beam type heating furnace 4 Mill exit table 21 Loading port 22 Flue 23 Pre-tropical zone 25 Heating zone 27 Soaking zone 29 Transfer section 31 Fixed beam 32 Moving beam 33 Moving beam Feed cylinder 34 Moving beam lifting cylinder 35 Frame 37 Roller 38 Lever 39 Rod 41 Hearth roll 43 Movable hearth roll drive device 51-59 Slab

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location C21D 9/00 101 B 9352-4K J 9352-4K

Claims (3)

[Claims] 1. A slab heating and feeding device for a rolling mill such as a planetary mill which rolls a slab as a material to be rolled while continuously feeding the slab; The walking beam type heating furnace is arranged so that the slab transportation direction is perpendicular to the rolling direction of the rolling mill, and the slab is installed in the rolling machine in the longitudinal direction in the extraction side furnace of this walking beam type heating furnace. A slab heating and feeding device for a planetary mill, which is provided with a hearth roll group that continuously feeds. 2. At least a part of the rolls of the hearth roll group is arranged on an extension of the fixed beam of the walking beam type heating furnace, and the heating slab is supplied by the walking operation of the moving beam of the furnace. The slab heating and supplying device for a planetary mill according to claim 1, 3. The planetary according to claim 1, wherein at least a part of the rolls of the hearth roll group is movable between a position inside the walking beam type heating furnace and a position outside the walking beam type heating furnace. Slab heating and feeding device for mills.