WO1989011348A1

WO1989011348A1 - Hot rolling equipment for strip coils

Info

Publication number: WO1989011348A1
Application number: PCT/JP1988/000489
Authority: WO
Inventors: Sadakazu Masuda; Fumio Fujita; Tadayoshi Murakami; Masahiko Yoshino; Ryuichi Yagi; Masamoto Kamata
Original assignee: Nippon Kokan Kabushiki Kaisha
Priority date: 1987-03-06
Filing date: 1988-05-23
Publication date: 1989-11-30
Also published as: EP0381756A4; EP0381756A1; JPS63220901A; KR900700195A

Abstract

This invention relates to rolling equipment suitably used to roll a strip coil made of fragile material such as high-silicon steel. This equipment is provided with a rolling mill, tension reels disposed at the inlet and outlet sides of the rolling mill, and deflector rolls disposed between the tension reels and rolling mill. The tension reels are provided in heat retaining furnaces having heating means. The rolling rolls and deflector rolls are provided with means for heating these rolls. Strip heating units are provided at the inlet and outlet of the rolling mill.

Description

Warm rolling equipment for fine strip coil

The present invention relates to a hot-rolling equipment suitable for a thin-plate coil, particularly a difficult-to-work thin plate. Technology In recent years, there has been a strong demand for miniaturization and high efficiency of electromagnetic and electronic components from the viewpoint of resource saving and energy saving, and silicon steel sheets with excellent soft magnetic properties and i. It has been. The soft magnetic properties of the silicon steel sheet improved with the addition of Si, showing the highest permeability especially around 6.5 wt.%, And the high intrinsic electric resistance. It is known that the loss is also small. Seed of the steel sheet of this is, S i content force;. ⁴ O wt or more on and Do that and workability sharply deterioration, produced on an industrial scale by i high silicon steel sheet rolling method in the conventional for this Although it was considered impossible to do this, recent research has shown that hot strip rolling is possible.

However, the rolling equipment generally used in the past cannot secure the bending deformation of the coil and the material temperature, and it is difficult to perform the thin rolling of high silicon steel sheet. like this For example, in Japanese Patent Application Laid-Open No. 61-135,407, a facility in which a space from the rewinding reel to the first stand of the rolling mill is covered with a heat insulating wall. However, even with such an installation, it is possible to sufficiently prevent cracking due to bending by the deflector roll and cracking during rolling.

The present invention has been made in view of such a conventional problem, and therefore does not cause cracks or the like in hard-to-work thin sheets such as high silicon steel sheets, and can efficiently elongate the sheets. Warmth

It does not provide E-rolling equipment. DISCLOSURE OF THE INVENTION For this purpose, the present invention releases the strip between the tension reels and keeps the strip at a predetermined temperature at all times during the rolling. The rolling equipment is designed to prevent cracks and breaks due to bending and processing, and its configuration is J9 below. In other words, the rolling equipment includes a rolling mill, the tension reels provided at the entrance and the exit of the rolling mill, and each of the tension reels and the Wang No. And a deflector roll provided therebetween. The above-mentioned tension roll is placed in a heat-retaining furnace having a heating means, and these rolls are heated by a rolling roll of a rolling mill and the above-mentioned deflector roll. In addition to the heating means to be provided, strip heating is provided at the entrance and exit of the rolling mill. Equipment is provided.

In such a rolling mill, the strip is rolled between the tension reels by a rolling mill.] Reverse rolling is performed, and in the case of a high silicon steel sheet, the hot rolling is usually about 2 leaks thick. The coil is rolled into a thin plate of about 0.5 mm thickness. The rolling roll of the rolling mill is preheated to about 200 ° C (surface temperature) by the heating means, and the deflector roll is also constantly heated to about 200 ° C (the surface temperature) by the heating means. Surface temperature). The strip coil is heated and maintained at a temperature of about 300 to 600 ° C in the heat retention furnace, and is unwound from one of the tension reels. The strip generated from the heat-retaining furnace power is rolled by rolling rolls via a deflector roll. Since the deflector roll is heated, the temperature of the strip passing through the deflector roll is suppressed, and the bending of the deflector roll is prevented. It is. The strip that has passed through the deflector horn is heated by a heating device at the entrance of the rolling mill to secure the strip temperature during rolling, and is then injected into the rolling mill. . Since this rolling roll is preheated, stripping of the strip also minimizes heat removal in the rolling roll. The strip coming out of the rolling roll is heated by a heating device provided at the outlet side of the strip.] 5 The heated strip is heated to a higher temperature and passes through the heated deflector roll. Then, it is surrounded by the other tension reel in the heat retention furnace. Even in this heat retention furnace, strip co Isole is 200 to 600. Heated and held to about C. Then, the rolling is repeated], and the strip is rolled into a thin plate.

As described above, the strip is always maintained at a predetermined temperature or higher (for example, 200 ° C or higher) during the reverse rolling, and the tension reel portion and the deflector Cracking due to bending and processing at the tail section and rolling section Rolling is performed while appropriately preventing breakage.

In the case of rolling high-silicon steel sheets, strips are heat-retained in a ripening furnace between each pass of reverse rolling, so that pass-to-pass recovery processing is performed. Its maximum permeability is improved. In other words, the strain introduced into the structure during rolling is appropriately released by the low-temperature heat treatment by keeping the heat in the heat-retaining furnace, and the strain introduction and the appropriate strain are performed. Through repeated release, the texture of the final product changes, and as a result, the magnetic properties are improved.

FIG. 1 is an explanatory view showing an embodiment of the present invention. Figure 2 shows the air cooling temperature drop according to the strip thickness. Fig. 3 shows the decrease in the temperature of the strip due to roll contact during rolling. This is shown in relation to the post-rolling temperature. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention. The rolling equipment includes a rolling mill (1) and tension reels (2a) (2a) ( ² ) provided on the entrance and exit sides thereof. and 2b), each tape down-motion differential Selector Selector b Lumpur (3) and Ru Tei includes an upper Symbol respective Te emissions provided et the between Li Lumpur and rolling mill tion Li Lumpur ⁽² a ) (2b) is placed in a heat retention furnace (4a) C4b) having heating means. Each heat retention furnace (4) is configured as a gas furnace having a heating burner (5), and any appropriate heating means can be used. Wear .

At the entrance and exit of the rolling mill (1), a heating device (6) (6b) for heating the strip to be passed is provided. A heating furnace equipped with a furnace (for example, a C gas furnace), an electric radiation heater, a radiant tube, and the like can be used.

Two deflector rolls (3) are provided on each of the entry side and the exit side of the rolling mill. Each deflector roll (3) is provided with a heating means, and in this embodiment, each deflector roll (3) is configured such that high-temperature oil can be circulated inside. Has been. As another heating means, for example, Appropriate configurations can be adopted, such as disposing a burner that can directly heat the roll surface, or incorporating an electric heater inside the roll. Also, the number of deflector rolls depends on the bending angle of the strip], and one or more deflector rolls are arranged according to the opening diameter and the arrangement state.

The roll (7) is provided with a heating device for preheating the roll.)) In the present embodiment, the roll (7) faces the upper and lower rolls (7). A heating burner (9) is provided. As a heating means, a high-temperature oil supply nozzle device is provided opposite to the backup roll (8), and the Wangen roll (via a backup roll) is provided. The structure 7) can be preheated.

In other respects, αο) is a thickness gauge, tti) is a thermometer, and (12) is a lubricating grease supply device.

Name your, Ε Nobe璣) is can use ho of the four double rolling mill good cormorant Ru of this embodiment, 6 double rolling mill, a 5-fold rolling mill .. planetary rolling mill, etc. _¾ appropriate kind of also of, or Not only one stand but also a multiple stand reverse rolling mill can be used. In the case of multiple stands, strip heating devices are provided at the entrance and exit of each rolling mill. In this way, it is possible to use a multi-stand rolling mill], so that rolling can be performed efficiently.

According to the rolling equipment as described above, both heat retention furnaces C4a) and C4b) The strip coil (A) inside is usually kept at a temperature of 200 to 600 ° C, and each of the deflector rolls (3) is also heated. It is constantly heated so that its surface temperature is about 200. The rolling roll (7) is preheated or constantly heated so that its surface temperature becomes about 200 ° C, depending on its heating means.

The strip (S) of about 200 to 600 ° C, which is rewound from the other side of the tension reel), is taken by the deflector roll (3). The sheet is bent and sent to the rolling mill (7). However, since the deformer roll (3) is heated to about 200 ° C, the strip (S) is At least at such a temperature, it can be passed through without breaking. The strip (S) is immediately introduced into the caro loading device (), heated to a rolling temperature, and then rolled by a rolling mill (1). Since the rolling roll is heated or preheated, the strip (S) force can be prevented from being released here as well.圧延 Note that the rolling roll (7) does not always need to be constantly heated, for example, it is pre-heated first and the initial stage until the strip becomes sufficiently hot. In order to prevent the strip temperature from dropping during the operation, and then to transfer the heat from the strip.) ;it can .

The rolled strip (S) is immediately introduced into a heating device (¾) on the outlet side and heated, and then the same as described above. ° After strip passing the heated C about the surface temperature was de off Selector Selector port Lumpur (3), Honetsuro ⁽⁴ b) in the even Cormorants one hand down-motion Li - Le ( ¾). The strip (S) is rolled between the tension reels (2a) and (2b) as described above to form a thin plate having a predetermined thickness. You.

Figure 2 is be sampled Clip plate cooling temperature drop amount depending on the thickness (Atmosphere ² 5 ° C in a sheet temperature 4 0 0 ° C or these drop) also Der was shown a! In addition, strips having a small thickness have a very large temperature drop, and therefore, the rolling of the strip can be performed without providing any heating means between the tension reels. If performed, the warm state cannot be maintained. Fig. 3 shows the temperature drop of the strip due to roll contact during rolling, as a function of the relationship between the surface temperature of the rolling roll and the post-rolling temperature of the strip. Therefore, it can be seen that by maintaining the rolling roll surface temperature at a predetermined temperature, rolling can be performed while effectively suppressing the drop in the temperature of the strip.

When the high silicon steel sheet is reverse-rolled as described above, the strip (S) is applied for a predetermined time (usually 1 to 1 step) in the heat-retention furnace C4a) (4b) between each of the strips. ,) I path between the recovery process and the child to be held ^[3 0 0-6 0 0. C [low temperature heat treatment]. By this inter-pass recovery processing, the strain introduced into the assembly during rolling is appropriately released, and the distortion is introduced by rolling and the moderate strain is released by the recovery processing. And yo, The texture of the final product has been improved to an advantageous form in terms of magnetic properties

-0 o

During rolling as described above, each rolling roll (7) is supplied with a lubricating grease supply device (12) from a heat-resistant lubricating grease (eg, a flash point force S300 °). Grease or more).

In addition, when a high-temperature oil supply device is provided as a heating means for the rolling roll, the supply device usually applies a temperature of 200 ° C J¾ to the backup roll (8). Hot oil is applied and the rolling roll (7) is preheated via the preheating of this backup roll.

According to the above-described apparatus of the present invention, the reverse rolling is performed while maintaining the sheet temperature at least at 200 ° C. or more when bending or reduction is applied to the strip. This makes it possible to roll even hard-working steel-plates with Si: 4.0 wt% or more without causing cracks or breakage. O

In the case of rolling high silicon steel sheets, the strip is Lino '

— The heat retention between each pass of the E-roll allows the inter-pass recovery to be performed, thereby improving the magnetic properties of the i9 final product. -Industrial applicability This rolling equipment is used for rolling of hard-to-work thin sheets such as high silicon steel sheets. Can be used in a favorable manner

Claims

(1) Rolling mills, tension reels provided on the inlet and outlet sides of the rolling mill, and differentials provided between the respective tension reels and the rolling mill. Request with

Wang Nobu equipment, wherein the tension roll is disposed in a heat retaining furnace having a heating means, and a rolling roll and the deflector roll are provided with a roll. A heating means for heating these rolls is provided, and a strip coil is provided at the entrance and exit of the rolling mill. Warm rolling equipment.

(2) The equipment according to the above (1), wherein the heating means for heating the rolling roll is a means for directly heating the rolling roll.

(3) The method according to claim (1), wherein the heating means for heating the roll is a means for indirectly ripening the rolling roll via a backup roll of a rolling mill. Equipment.

(4) The configuration according to claim '3, wherein the heating means is a high-temperature oil supply nozzle device provided to face the backup roll.

(δ) Claims (1), (2j. (3) wherein a plurality of stand rolling mills are provided, and a strip heating device is provided at the entrance and exit of each rolling mill. ) Or the equipment described in (4).

(6) The heating means of the deflector rolls Claims (1) having a structure for flowing the medium,

Equipment described in ( ²⁾ , (3), (4) or (5).

(7) Claims wherein the heating means for the deflector roll is a ripening means for heating the roll from the outside: 1), (2) _¾ (3),

Equipment described in (4) or ( ⁵ ).

(8) Claims (1), (2) having a grease supply device for supplying lubricating grease in the vicinity of Wang Nobuguchi

The equipment described in (3), (4), (5), (6) or (7).