JP2927876B2 - Nozzle for manufacturing quenched metal continuous ribbon - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of continuously supplying a molten metal such as stainless steel or an aluminum alloy to a surface of a moving cooling body such as a cooling roll to form a 30 to 200 μm thick metal. The present invention relates to a technology for manufacturing a quenched metal continuous ribbon.

[Conventional technology]

Conventionally, in the production of such quenched metal continuous ribbon,
In order to obtain a wider quenched metal continuous ribbon, various means have been proposed for uniforming the thickness of the ribbon in the width direction.

For example, Japanese Unexamined Patent Publication No. Sho 60-174239 discloses a method of maintaining uniform fluidity of a molten metal in a width direction by heating a holder portion of a nozzle to have a heat retaining power and further tilting an opening portion thereof. Has been proposed.

In Japanese Patent Application Laid-Open No. 63-76742, a plurality of baffles are provided between the inlet and the outlet of the pool of the molten metal so as to intersect with the falling flow of the molten metal, thereby rectifying the flowing molten metal. It has been proposed to maintain a uniform flowability in the width direction by performing the process.

Further, Japanese Patent Application Laid-Open No. 63-220950 discloses that an opening of a nozzle tip for discharging a molten metal is formed from a plurality of openings having an angle with respect to the rotation direction of a quenching roll, thereby providing a uniform flow rate in a width direction. It is disclosed that retention is possible.

[Problems to be solved by the invention]

The quenched metal continuous ribbon manufacturing nozzle of the present invention has a molten metal injection port on the upper surface, has a space for the molten metal pool below, a nozzle holder having an open port below the space,
In a nozzle structure having a nozzle tip attached to an opening of the nozzle holder, a filter having a porosity range of 5 to 30 cells / inch is provided over substantially the entire molten metal pool space of the nozzle holder.

[Means for solving the problem]

The quenched metal continuous ribbon manufacturing nozzle of the present invention has a molten metal injection port on the upper surface, has a space for the molten metal pool below, a nozzle holder having an open port below the space,
In a nozzle structure having a nozzle tip attached to an opening of the nozzle holder, a filter is provided in a molten metal pool space of the nozzle holder.

[Action]

According to the present invention, by disposing a filter having a large flow resistance in the molten metal pool space, the flow resistance is changed by the flow velocity colliding with the filter as compared with a conventional baffle plate or the like (the resistance is large at the central part where the flow velocity is large). , And low resistance at the end where the flow velocity is low). As a result, a continuous flow resistance distribution is obtained in the width direction, whereby the flow in the width direction can be smoothly and uniformly made uniform by the effect of restricting the flow path to the nozzle tip.

The arrangement of the filter in the pool of the nozzle holder is preferably provided on the entire plane of the pool space from the viewpoint of increasing the effect of restricting the flow velocity at the entire tip opening of the nozzle tip, and furthermore, by disposing the filter in the entire space. ,
The flow rate of the molten metal is made uniform over the entire surface.

As the filter, a ceramic filter having corrosion resistance to molten metal such as alumina and having excellent wear resistance and strength can be used, and the porosity of the filter ranges from 5 to 30 cells / cell. inch is preferred. In the present invention, "cell / inch" indicates the number of cells (spaces) formed by a skeleton of ceramics arranged in a straight line between one inch as shown in the conceptual diagram of FIG. Figure 6 shows 5 cells / in
It is a figure showing the example of ch.

Furthermore, if filters having different degrees of opening are divided and installed in the width direction, uniformity of the discharge flow distribution in the width direction is promoted (see FIG. 7).

Furthermore, by using a nozzle tip disposed at the lower opening of the nozzle holder together with a nozzle tip having a function of adjusting the flow of the molten metal to the outer end portion, the amount of the molten metal discharged to the movable cooling surface is further reduced over the entire width. It is possible to make it more uniform.

〔Example〕

 The accompanying drawings show an embodiment of the present invention.

FIG. 1 is a longitudinal sectional view showing a nozzle according to an embodiment of the present invention, and FIG. 2 is a view seen from line II-II in FIG.

In these figures, 1 is a nozzle holder,
For example, it is formed of a conductive material such as alumina-graphite, and has a structure heated by energization from an electrode (not shown). The upper surface of the nozzle holder 1 is provided with a molten metal inlet 2 for receiving a molten metal from a molten metal supply means (not shown), and a space 3 for storing the molten metal is formed on an inner surface following the molten metal inlet 2.

In the space 3, flat filters 4 and 5 made of alumina ceramic material having a porosity of 5 to 30 cells / inch are occupied in substantially two-step space occupying almost the entire plane space. Have been.

Reference numeral 6 denotes a nozzle tip disposed at the lower end of the lower opening of the nozzle holder 1.

A more uniform effect can be expected by using the nozzle tip 6 having a structure having a flow rate adjusting function in the width direction as disclosed in JP-A-63-220950.

FIG. 3 shows an oblique comb-shaped nozzle tip 61 disclosed in the same publication, and 10 to 10 with respect to the rotation direction of the quenching roll.
Those in which a plurality of openings A ₁ to A _n with 80 ° angle alpha, which, by applying to those of the nozzle structure shown in FIGS. 1 and 2, a falling amount of the nozzle structure Can be more remarkably exhibited.

FIG. 4 shows a slit nozzle tip 62 having a flow rate adjusting function in the width direction similarly to that shown in FIG. 3, and is attached to the nozzle structure shown in FIG. 1 and FIG. A similar effect can be expected by using this.

In the slit nozzle chip 62 shown in FIG. 4, the opening B is such that the opening width a at the end is the opening width b at the center.
It has a function of compensating for the pressure loss at the end portion when the molten metal flows down in the same portion.

FIG. 5 shows the effect of the structure shown in FIGS. 1 and 2 in comparison with that of the conventional system.

In the figure, (a) shows the mode of the pressure loss in the width direction according to the embodiment of the present invention, and (1) shows the case where the slit nozzle tip shown in FIG. 4 is used as the nozzle tip.
(2) shows a case where an oblique comb type nozzle tip having the structure shown in FIG. 3 is used as the nozzle tip. Also,
(B) shows a comparative example in which no filter is used for the nozzle holder, and (3) shows a case where the slit nozzle tip shown in FIG. 4 is used alone as the nozzle tip.
(4) shows a case where the oblique comb-type nozzle tip having the structure shown in FIG. 3 is used alone as the nozzle tip.

As a result, when the filter is placed in the space inside the nozzle holder, the uniformizing effect over the entire width is
It is extremely remarkable, and it can be seen that the effect is further remarkable when a nozzle tip having a flow rate adjusting function in the width direction is used in combination with the nozzle tip.

Further, as shown in FIG. 7, a filter 51 having a porosity of 5 cells / inch, a filter 52 having a porosity of 10 cells / inch, and a porosity of 2
A more uniform discharge flow rate distribution can be obtained by dividing the filter 53 of 0 cell / inch and a filter having a different opening degree in the width direction.

〔The invention's effect〕

 According to the present invention, the following effects can be obtained.

(1) Uniform flow rate in the width direction is achieved, 50-160mm
Variations in the thickness of the thin ribbon can be kept within ± 10%.

(2) Since the flow rate can be made uniform in the width direction by disposing the filter, the flow path space can be reduced. As a result, the size of the nozzle holder can be reduced, and the capacity of the electric power supply for heating can be reduced.

(3) By selecting the opening degree of the filter and the size of the shape of the nozzle discharge port in the width direction, the thickness distribution in the width direction can be controlled to a profile required by the product (for example, a central concave type, a central convex type, etc.).

[Brief description of the drawings]

The accompanying drawings show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view showing a nozzle of an embodiment of the present invention,
FIG. 2 is a view as seen from the line II-II in FIG. FIG. 3 and FIG. 4 are diagrams showing aspects of the opening of the nozzle tip.
FIG. 5 is a diagram showing an example of the effect of the present invention. Also, the sixth
The figure is a conceptual diagram to explain the meaning of cell / inch,
FIG. 7 is a longitudinal sectional view showing a nozzle in which filters having different opening degrees are divided and installed in the width direction. 1: Nozzle holder, 2: Molten inlet 3: Space 4, 5, 51, 52, 53: Flat filter 6: Nozzle tip 61: Diagonal comb type nozzle tip 62: Slit nozzle tip

──────────────────────────────────────────────────続 き Continuing on the front page (72) Minoru Yamate 1-1-1, Edamitsu, Yawatahigashi-ku, Kitakyushu-shi, Fukuoka Pref. Nippon Steel Corporation 3rd Technology Research Institute 1 Fujimachi, Hirohata-ku, Hirohata Works, Nippon Steel Corporation (56) References JP-A-63-188454 (JP, A) JP-A-57-103761 (JP, A) JP-A-61-296941 (JP, A) JP-A-62-166056 (JP, A) JP-A-64-38148 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B22D 11/00-11 / twenty two

Claims (2)

(57) [Claims] 1. A nozzle holder having a molten metal inlet on an upper surface, a space for a molten metal reservoir below the nozzle, and an opening below the space, and a nozzle attached to an opening of the nozzle holder. A quenched metal continuous ribbon manufacturing nozzle comprising a nozzle structure having a tip, wherein a filter having a porosity range of 5 to 30 cells / inch is provided in substantially the entire molten metal pool space of a nozzle holder. 2. The nozzle according to claim 1, wherein the filters having different porosity are divided in the width direction of the nozzle.