KR820001849B1 - Reheating furnace of hot rolling line - Google Patents

Abstract

A casting process and rolling process are directly interconnected through a reheating furnace. This reheating furnace is used for hot rolling line equipped as a heating process after casting. In figure 2, reheating furnace(H), a walking beam type, is supported by suitable supporters. Reheating furnace(H) consists of furnace body(Hf), housing, walking beam part(B), and axial flow burners(F). Mobile beam B1B2 B3 is connected mutually by a rotary eccentrical wheel(1) under beam B1-B3. Hydraulic cylinder 21 22 23 is connected by magnetic clutches(31 32) provided between beam B1-B2 and B2-B3.

Description

Reheating of the hot rolling line

1 is a perspective view showing a facility of a hot rolled line from a continuous casting device to a rolling device.

2 is a schematic side view of a reheating furnace according to an embodiment of the present invention.

3 is a diagram showing the sequence of operation of the reheating furnace of FIG.

4 is a plan view showing the structure of the reheating furnace according to the renovation of the equipment of FIG.

FIG. 5 is a view similar to FIG. 2 showing the sequence of operation of the retrofitted reheat furnace of FIG.

The present invention relates to a hot rolling method, and more particularly, to a reheating furnace in a hot rolling line.

In recent steel mills, energy energy, energy efficiency and high efficiency have always been explored by various continuous processes. Manufacturing lines from the continuous casting process to the rolling process have been involved in such efforts and such continuous processing has been attempted by placing reheat furnaces between the continuous casting apparatus and the rolling apparatus.

In the above-described conventional equipment, since the continuous casting speed is greatly different from the rolling speed which is usually several times higher, the reheating used serves as a buffer or absorption zone to absorb the difference in production capacity between the two processes as much as possible. To be required.

In particular, in order to meet the above requirements, the use of a reheating furnace capable of continuously charging the material from a low speed casting process without simultaneously discharging the material and changing the conveying speed of such material for rolling at a high speed is required. . Such reheating furnaces also provide for the high operating efficiency of the rolling mill and the operation of the rolling mill which is operated at high speed by storing a predetermined amount of material to be rolled continuously at low speed and vertically transferring a group of such materials therefrom. It should be arranged to achieve sanctification by reducing the cycle as much as possible. Reheating furnaces for that purpose should have heating and heat-retaining capacity to retain the heat of the heated material to be rolled until the material loaded in the furnace is heated to a predetermined rolling temperature, without increasing its length.

Accordingly, the main object of the present invention is to simultaneously reduce the length of the furnace for elimination of inherent disadvantages in conventional furnaces, and to be rolled in hot rolled lines having a short stagnation time for reheating for effective heating and retention of the material to be rolled. It is to provide an improved reheating furnace to achieve an improved heating method for the material at an effective manner and at a lower cost.

It is another object of the present invention to provide a reheating furnace of the type described above which is simple in structure and stable in operation and which can be easily coupled to a hot rolling line.

In order to achieve these objects, according to one preferred embodiment of the present invention, a reheating furnace is a continuous casting device for casting billets or slabs at low speed and slabs at a speed greater than the speed at which the slabs are cast. It is installed between the rolling device and acts as a heating and buffering zone. The reheating furnace includes at least three moving beams having independent drive mechanisms and connecting mechanisms for connecting adjacent double beams for independent or synchronous movement, the two beams actuating the drive mechanism. By means of which their speeds are connected at the discharge rate of the material from the continuous casting process, and one or two iso beams are arranged to be leveled or stationary at the rolling speed. This arrangement not only reduces the stagnation time in the reheating furnace, but also shortens the length of the furnace and eliminates the inherent disadvantages of conventional types of reheating furnaces.

These advantages and features of the present invention will become apparent from the following description of the preferred embodiments described with reference to the accompanying drawings.

In the figure, the arrangement of the hot rolling line from the continuous casting machine C to the rolling mill R is shown in FIG. 1, between which the reheat furnace H, which is directly related to the present invention and will be described in detail with reference to FIGS. It is arranged as a heating and buffering zone. In continuous casting apparatus C, the molten metal m contained in ladle C ₁ is fed to tundish C ₂ to continuously cast into, for example, in mold assembly C ₃ in the form of rod b. Is cast. The casting enters _a plurality of jaw guide furnaces between r _a through straighter C ₄ along a curved passageway and is continuous with billet or slab S and such materials by cutting member C ₅ in a known manner. Is cut. The billet S thus formed is transferred to a charging table (not shown) arranged in _a row at the charging side H _a of H by reheating by a transfer roller r _b and charged into the furnace H by the press-in member P. To rolling by a discharge table discharged (not shown) and transfer roll r _c arranged on the discharge side H _b of furnace H by the action of the pushing-out member E the billet S processing in the furnace H to be described way, the furnace H to It is fed to the apparatus R and rolled in the form of a steel plate f.

In FIG. 2, the reheating furnace H according to the invention of the walking beam type is supported on the bottom by a suitable support member (not shown), and the discharge end H of the furnace H for the material W (i.e. billet S). Refractory housing or furnace body Hf extending from charging end H _a to _b , eg longitudinally divided into three parts, ie moving beams B ₁ , B ₂ , B ₃ , and being movable to the furnace body H _f It consists of a plurality of burner members F, for example axial flow burners, provided in the furnace body H _f at predetermined intervals for heating the moving or working beam member B, material W. The moving beams B ₁ , B ₂ and B ₃ are associated with each other via an eccentric wheel 1 rotatably disposed below the beams B ₁ -B ₃ and the wheel 1 is the cow for the vertical movement of each beam B ₁ -B ₃ . Drive source (not shown), beams for horizontal drive of beams B ₁ -B ₃ for hydraulic actuating cylinders 2 ₁ , 2 ₂ , 2 ₃ , or for driving of beams B ₁ -B ₃ Each of B ₁ -B ₃ is connected to a coupling mechanism 3 ₁ and 3 ₂ , such as a magnetic clutch provided between adjacent beams B ₁ and B ₂ , B ₂ and B ₃ to drive independently.

For proper driving of the moving beams B _1- B ₃ , the eccentric wheel 1 and the hydraulic cylinders 2 ₁ , 2 ₂ , 2 ₃ are connected in a known manner to the speed control circuit X _a of the control member X having a conventional logical operation circuit. The connecting mechanisms 3 ₁ and 3 ₂ are connected to the connection control circuit X _b of the control member X, respectively.

Referring to FIG. 3, the operation of H with the reheating of FIG. 2 is described below.

When, for the generation in a continuous casting process, for example, it assumed that the series C confined billet W is charged continuously to the H to re-heating at intermediate conveyance speed of 0.3m / min starting from a third-degree state (a), moving the beam B ₁ , B ₂ and B ₃ are driven together by coupling devices 3 ₁ and 3 ₂ for synchronous movement at a speed of 0.3 m / min, and the rolled material W is continuously transported to the discharge end H _b and heated by burner F shown in b).

When all the rolled material W is charged to the furnace H together with the front end rolled material W of the rolled material group reaching the discharge end Hb (Fig. 3 (c)), the moving beam B ₁ is driven by the control circuit _Xb . Under the action of coupling mechanism 3 ₁ , the beams are separated or cut from the moving beam B ₂ , and the beams B ₂ and B ₃ are connected to the coupling mechanism 3 ₂ so as to be only shanghai-dong at low idle speeds to achieve an idle process, ie a heat retention process. By being associated with each other. Subsequently, after a predetermined time elapses, the rolled material W is discharged by synchronous driving of the moving beams B ₂ and B ₃ at a high discharge rate of 0.58 m / min to be transferred to the rolling apparatus R. The discharge or feed rate for beams B ₂ and B ₃ is changed by changing the cycle time.

On the other hand, the to-be-rolled object, that is, the billet W ', newly manufactured by the continuous casting device C is continuously charged into the beam B ₁ to be conveyed at an intermediate feed rate of 0.3 m / min (third (d) degree). In particular, in the state of FIG. 3 (d), the moving beam B ₁ transfers the to-be-rolled object W 'at an intermediate feed speed of 0.3 m / min, and the to-be-rolled object W is fed at a feed speed that is fed by the coupling mechanism 3 ₂ . when transferred to the beam B _3, the beam B _1, B ₂ is the function of the association is moved, the connecting mechanism ₃₂ by a connecting mechanism ₃₁ to continue feeding the feed rate jeunggan LE be rolled water W 'of 0.3m / min The beam B ₃ separated from the beam B ₂ by this discharges the to-be-rolled object W continuously at a high discharge rate of 0.58 m / min (third (e) degree). That is, in the state of FIG. 3 (e), the beams B ₁ and B ₂ are fed by the coupling mechanism 3 ₁ and transfer a group of the to-be-rolled objects W 'at an intermediate feed rate of 0.3 m / min, and the beam B ₃ discharges the to-be-rolled object W at a high discharge rate of 0.58 m / min.

After completion of the discharge of the group of to-be-rolled objects W, beam B ₃ is fed into a joint with beam B ₁ by the action of the coupling mechanism 3 ₂ and continues to supply the to-be-rolled object W ′ towards the discharge side H _b . The feedrate of 0.3 m / min is changed with B ₁ and B ₂ equally. Subsequently, the furnace H is returned to the state of FIG. 3 (c) and at a predetermined time interval, the rolled object W produced by the continuous casting apparatus C is charged to H by reheating regardless of the rolling start time.

In FIGS. 4 and 5, a modified embodiment of H with the reheating of FIGS. 2 and 3 is shown in FIG. 4. In the H _A in a modified reheat 4 degrees, the furnace body H _Af is near the central portion and the charging end H _a discharge end of the furnace H _A from the H _b a portion extending to heat separate the interior of the furnace H 2 column jungcheuk H ₁ and has a partition wall H _W a refractory brick for dividing by H _2, and that a separate heating element H ₁ and H ₂ may each have a separate entrance H _1a and H _2a and outlet H _1b and H2b to be rolled water W The heating sections H ₁ and H _2, divided longitudinally into at least three sections, are moved to the beams B ₁ , B ₂ and B ₃ and B ₁ ', B ₂ ', and B ₃ ', respectively, in a manner similar to that of furnace H in FIG. It includes.

Referring to FIG. 5, the operation of H _{A with} the reheating of FIG. 4 will now be described.

To-be-rolled material For example, when the billet W cast by the continuous casting process C is charged to the first heating zone H ₁ at a charging speed (sales speed) of 0.3 m / min, beams B ₁ , B ₂ , B ₃ is driven at a feed rate of 0.3 m / min to continuously convey the workpiece W heated by burner F shown in FIG. ₂ , and the workpiece W reaches the middle portion of beam B ₂ . Afterwards (when the amount of the to-be-rolled product is equal to half of the amount cast by the continuous casting process), the subsequent to-be-rolled product W is charged to the second heating unit H ₂ and burner F shown in FIG. It keeps moving while it is heated. Subsequently, when the tip of the group of the to-be-rolled object W _a in the first heating unit H ₁ reaches the discharge side H _1b , the second beams B ₂ and B ₃ perform an idle process to hold the heated to-be-rolled object W _a . Associate move to start (figure 5 (b)). Thereafter, the to-be-rolled object W _b in the second heating portion H ₂ is heated and retained, and the to-be-rolled object W from the second continuous casting process is charged into the first heating portion H ₁ , and by the beam B ₁ for a predetermined time. After being transferred, the beams B ₂ and B ₃ in the first heating portion H ₁ start the discharging process to discharge the to-be-rolled object W _a at _a rate of 0.58 m / min (FIG. 5 (c)). Subsequently, when the to-be-rolled object W on the second beam B ₂ is transferred to the beam B ₃ , the second beams B ₁ and B ₂ are fed at a feed rate of 0.3 m / min to transport the subsequent to-be-rolled object W _a ′ to the beam B ₂ . United to. After the discharge of the to-be-rolled object W on the beam B ₃ is completed, the beam B ₃ moves together with the beams B ₁ and B ₂ for a feed movement at a speed of 0.3 m / min. And when the subsequent to-be-rolled object W _a ′ (equivalent to half of the amount produced by the second continuous casting crystal) is charged, switching to charge into the second heating unit H ₂ is achieved, and thus, the first heating unit H _{In the} same manner as in ₁ , the to-be-rolled material W _b in the second heating portion H ₂ is discharged at a rate of 0.58 m / min (figure 5 (e)), and the beams B ₂ 'and B ₃ ' are discharged side H _2b The transfer continues at an ideal speed of 0.3 m / min to transport the subsequent to-be-rolled object W _b 'towards.

The furnace H _A is then in the state shown in FIG. 5 (b), and the first or second heating is performed in order to continuously roll the rolled object by the rolling apparatus R at a predetermined time interval in the continuous casting process C. Heated in part H ₁ , or H ₂ .

Although the present invention has been mainly described with reference to the upper and lower ignition type working beam furnaces in the above-described embodiment, the present invention is not limited to only such working beam furnaces but can be easily applied to the upper ignition type working furnaces having brick furnaces. Please note that.

In addition, the present invention is not limited to the application of the continuous hot rolled lie from the continuous casting device to the rolling device, but from the crushing rolling mill to the rolling mill, for example, the slab rolling mill, to buffer the continuous process line in the recently limited direct hot rolling process (HDR). It can be used effectively as a furnace.

As is apparent from the above description, according to the present invention, the moving beam member for reheating is longitudinally divided into at least three parts, that is, three moving beams, the moving beams being capable of high speed discharge and continuous continuous charging of the rolled object. For effective movement of the moving beam, each can be driven by a separate bulb so that it can be achieved simultaneously by appropriate conversion of the drive mechanism without changing the conveying speed of the workpiece, thus saving the energy by reducing the length of the furnace. It is possible to achieve this.

Although the present invention has been described with reference to the accompanying drawings, it should be understood that various changes and modifications will be apparent to those skilled in the art. Accordingly, such changes and modifications are included within the scope of the present invention without departing from the scope of the present invention.

Claims (1)

In a reheating furnace for use in a hot rolling line which is directly connected by a casting process and a rolling process through a reheating furnace, which is rolled at a higher speed in the casting process, and which is installed as a heating process after a casting process for casting the rolled material to be rolled. Three moving members each having a charging and discharging side for the rolled material at its end corresponding to the casting and rolling process and extending in the conveying direction of the rolled material; And a rolled member conveying member constituted by a moving beam member which is at least divided into pieces, and connecting members connecting adjacent moving beams to each other to selectively perform synchronous movement of the moving beam and independent anisotropy.

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