JPS6039144Y2 - Continuous casting equipment for cast iron plates - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to improvements in continuous casting equipment for cast iron.

In general, continuous casting equipment for cast iron plates is shown in Fig. 1 as a line-cut side view and Fig. 2 as an enlarged front view of Fig. 1 as shown in Fig. 1.
The main parts are a cast iron molten metal holding furnace 1, a cooling surface 2, and a mold die 3. The cooling surface 2 is composed of an outer wall 4, an inner wall 5, and a coolant passage 6, and the inner wall 5 circumscribes and surrounds the mold die 3.

However, in this case, as shown in an enlarged view in FIG. 2, the clay wall 3' of the mold die 3 hangs down significantly from both ends toward the center, creating a gap 10 between it and the inner wall 5 of the cooling surface 2.

The causes of this gap are: (1) It is extremely difficult to manufacture the fitting gap between the outer surface of the molding die 3 and the inner surface of the inner wall 5 of the cooling surface 2 to zero due to manufacturing precision; (2) The soil wall 3 of the molding die 3
(2) deformation due to thermal expansion, (2) uneven cooling received from the cooling surface 2, and (2) impact when the slab is pulled out.

When the void 10 is generated, the contact between the inner wall 5 of the cooling surface 2 and the upper wall 3' of the die 3 is blocked by the air layer, which is a thermal non-conductor, so that the heat conduction between the two is drastically reduced, and for example, Even if the inside of this gap is about 0.1 mm, the thermal conductivity will be 1/3000 to 5000 compared to perfect contact.

That is, the cooling efficiency of the cooling surface 2 with respect to the molding die 3 becomes almost equal to zero.

As a result, the earthen wall 3' of the molding die 3 is overheated by the molten cast iron passing through it, and in extreme cases there is even a risk of breakout, and the casting surface on the top surface of the drawn cast iron plate is rough and rough. ■ The material of the upper layer of the drawn cast iron plate changes and becomes different from the others, ■ The material of the upper layer of the drawn cast iron plate changes and becomes different from the others, ■ The cooling rate of the slab decreases, and the drawing speed decreases. There are many problems in operation, such as having to reduce the

The purpose of the present invention is to solve this problem, and the molding die connected to the molten cast iron holding furnace is reinforced with a rib (flange) structure and closely integrated with the inner wall of the cooling surface surrounding it. This is a continuous casting device for cast iron plates characterized by having a structure.

That is, in the present invention, the mold die 3 is a rib (flange).
Since the structure is reinforced and will not be deformed by heating, temperature rise, vibration impact, etc., the outer surface of the molding die 3 is always closely integrated with the inner surface of the cooling surface inner wall 5, with no gap present therebetween.

As a result, ■ the entire circumferential wall of the molding die 3 is always completely cooled and has sufficient strength, so of course there is no risk of breakout; ■ the top surface of the drawn cast iron plate is as smooth and beautiful as the other surfaces; ■ The material of the upper layer of the drawn cast iron plate is completely the same as the other parts, and has many effects such as (1) increased cooling rate, which can increase the drawing speed and improve productivity.

Embodiment 1 FIG. 3 is a longitudinal sectional side view showing an embodiment of the present invention having a rectangular rib (flange) structure, and FIG. 4 is a front view taken along the line A--A in FIG.

In the figure, 1, 2, 3, 4, 5, and 6 are the same as in Figures 1 and 2, and 7 is the front end, rear end, and center of the cast iron plate drawing direction with respect to the upper and lower walls of the mold die 3. This is a reinforcing structure in which rectangular ribs (flanges) of equal thickness and height are integrally provided in three locations in the vertical direction on the cross section in the said direction.

In this case, the cooling surface 2 was also structured to be divided into upper and lower halves and tied together as shown in the figure.

In this example, since the rib (flange) 7 is rectangular and has a linear structure, it is easy to manufacture not only the rib itself but also the inner wall 5 of the cooling surface 2.

It goes without saying that this example also has the above-mentioned effects (1) to (2).

Embodiment 2 FIG. 5 is a vertical sectional side view showing an embodiment of the present invention having a catenary curved rib (flange) structure, and FIG. 6 is a front view taken along the line B--B in FIG.

In the figure, 1, 2, 3, 4, 5, and 6 are the same as in Figures 1 and 2, and 8 is the front, rear end, and center of the cast iron plate drawing direction with respect to the upper and lower walls of the mold die 3. This is a reinforcing structure in which catenary curved ribs (flanges) of equal thickness are integrally provided in the vertical direction at three locations on the cross section in the said direction.

This example also has a structure in which the cooling surface 2 is divided into upper and lower halves and held together as shown in the figure.

In this example, since the rib (flange) 8 has a catenary curve shape, the shape of the machined surface of both the inner wall 5 of the cooling surface 2 is complicated and it takes time to manufacture, but the protruding structure of the rib (flange) 8 An equal reinforcing force is applied to each part of the wall of the mold die 3, which has the effect of exhibiting the best reinforcing effect.

It goes without saying that this example also has the above-mentioned effects (1) to (4).

[Brief explanation of drawings]

Figure 1 is a cross-sectional side view of the cast iron plate continuous casting equipment, Figure 2
The drawings are an enlarged front view of Fig. 1 with an Eero cut, Fig. 3 is a longitudinal sectional side view showing an embodiment of the present invention with a rectangular rib (flange) structure, and Fig. 4 is a front view taken along the line A-A in Fig. 3. FIG. 5 is a longitudinal side view showing an embodiment of the present invention having a catenary curved rib (flange) structure, and FIG. 6 is a front view taken along the line B--B in FIG. 1...Cast iron molten metal holding furnace, 2...Cooling surface, 3...Mold die, 4...Cooling surface 2
Outer wall of 5... Inner wall of cooling surface 2, 6...
- Coolant passage on cooling surface 2, 7... rectangular grinding rib (flange), 8... catenary curved rib (flange).

Claims (1)

[Scope of utility model registration request] A continuous casting apparatus for cast iron plates, characterized in that a mold die connected to a molten cast iron holding furnace is reinforced with a rib (flange) structure and closely integrated with an inner wall of a cooling surface circumscribing and surrounding the mold die.