JPH04158972A - Ladle for ductile cast iron - Google Patents

Abstract

PURPOSE:To prevent flash and leakage of molten iron by forming a molten iron pouring hole communicated with inner part of a ladle body at bottom part in a molten iron receiving part and seating a spherical ball having sp. gravity lower than sp. gravity of molten ductile cast iron on a molten iron pouring hole. CONSTITUTION:A ladle for ductile cast iron is constituted with the ladle body 1 arranging a ladle cover providing porous body having continuous pores and the molten iron receiving part 2. Then, the molten iron pouring hole 4 communicated with the inner part of ladle body 1 formed with the bottom part 2a in the molten iron receiving part 2 and the spherical 3 seated on the molten iron receiving hole 4 and having sp. gravity lower than the sp. gr. of molten ductile cast iron, are arranged. By this method, the discharging quantity of white fume to the air can be drastically restrained, and good effect to the surroundings and the pollution countermeasure can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a ladle for ductile cast iron used for spheroidizing molten metal for ductile μ iron.

(Prior art) There is a method for spheroidizing molten metal for ductile cast iron, which involves directly pouring the molten metal into a ladle into which a spheroidizing agent has been added.
Inside the ladle? A commonly used method is to forcibly insert a spheroidizing material into the molten metal after pouring the molten metal.

[Problem to be solved by the invention]

In the conventional method, during the spheroidizing process, a large amount of white smoke and intense flashes are generated due to the reaction between the molten metal and the spheroidizing material, which significantly deteriorates the environment inside and outside the factory.

As a means to greatly reduce white smoke and flash, the present applicant has developed a special spheroidization method using a ladle cover equipped with a heat-resistant filter made of a porous material with open pores. A patent application was filed as Ganhei 2-203910.

The present invention aims to provide a ladle for ductile cast iron that can further improve the efficiency of collecting white smoke in the above-mentioned spheroidizing method.

[Means to solve the problem] The ladle for ductile cast iron of the present invention has the following measures.

(1) In a ladle 42 for ductile cast iron consisting of a ladle cover provided with a porous body with continuous pores and a ladle body provided with a receiving portion, the inside of the ladle main body is formed at the bottom of the receiving portion. A molten metal injection hole that communicates with the molten metal injection hole, and a spherical ball that sits on the molten metal injection hole and has a specific gravity smaller than that of the molten metal for ductile cast iron.

(2) In a ladle for ductile cast iron consisting of a ladle cover with a porous body with continuous pores on the upper part and a ladle main body provided with a receiving part, the molten metal is communicated with the bottom of the receiving part into the ladle main body. An injection hole was formed, and a hot water inlet was provided in the hot water receiving part.

(3) The ladle for ductile cast iron according to (2) above includes a spherical ball that sits on the receiving metal injection hole and has a specific gravity smaller than that of the molten metal for ductile cast iron.

(4) A ladle cover including a porous body with continuous pores and a cover that can open and close the pouring spout is provided in a portion of the ladle body that covers the pouring spout.

[Function] In the present invention, white smoke, flashes, and scattering of molten metal that occur during the spheroidization treatment of molten metal for ductile cast iron are largely prevented by the ladle cover equipped with a porous body with continuous pores. At the same time, bubbling of the molten metal is prevented by lowering the gas pressure within the ladle body, but the present invention described in each of the above items,
Furthermore, the following effects can be achieved. At the same time, an increase in internal pressure within the control body is prevented, and in the present invention described in (1) above, the spherical ball floats up in the molten metal due to buoyancy when receiving the molten metal, and the molten metal flows through the molten metal injection hole of the molten metal receiving part. It allows the metal to enter the ladle body, and then sits on the molten metal injection hole to prevent white smoke, flashes, and molten metal from leaking and scattering from the receiving part.

In the present invention described in (2) above, by providing a pouring port in the receiving portion, the opening of the ladle main body is reduced, and white smoke, flashes, and molten metal are prevented from leaking and scattering. In addition, the molten metal receiving part with the molten metal inlet is slag removed.

It can be used to measure temperature.

The present invention described in (3) above produces white smoke by the spherical ball sitting on the molten metal injection hole of the present invention described in (2) above.

The effect of preventing flashes and molten metal from leaking and scattering is further enhanced.

In the present invention described in (4) above, by using a cover that covers the pouring spout portion of the ladle body, one flash of white smoke from the pouring spout and ?
8'4j is prevented from leaking and scattering, and by opening the cover, pouring of molten metal for ductile cast iron can be carried out without any trouble.

[Example] A first example of the present invention will be described with reference to FIGS. 1 to 2.

Reference numeral 1 denotes a ladle main body, and its upper part is provided with a pouring spout 6 that spreads laterally in a 7-shape shape, and a hot water receiving part 2 that is made of fireproof material on the inside. A chamber 1a is formed. A molten metal injection hole 4 that communicates with the reaction chamber 1a in the ladle body 1 is provided at the bottom 2a of the receiving part 2, and a molten metal injection hole 4 is provided at the upper part of the molten metal injection hole 4 and is seated in the injection hole 4. A spherical ball 3 made of cast metal, ceramic, or the like having a specific gravity smaller than that of the molten metal to be closed is arranged. Reference numeral 8 denotes a ladle cover having a porous thermal filter 9 with continuous pores such as a three-dimensional network structure in a part thereof, and the ladle cover 8 is attached to the ladle body 1 and It covers parts other than the part 2 and the spout 6. Reference numeral 10 designates a slag removal port of the ladle cover 8, which is provided at a position on the ladle cover 8 corresponding to the opposite side of the pouring spout 6, and is configured to be openable and closable with a hinge 10a. A lower partition wall 5 rising upward is provided at the bottom of the ladle body 1.

In this embodiment, after putting the spheroidizing material 7 into the reaction chamber 1a at the bottom of the ladle main body 1 provided with the hot water receiving part 2, the ladle cover 8 provided with the continuous porous thermal filter 9 is installed. It is attached to the upper part of the ladle body 1.

After a spherical ball 3 is placed above the molten metal injection hole 4 of the molten metal receiving part 2 in advance, molten metal for ductile cast iron is injected into the molten metal receiving part 2. When the molten metal for ductile cast iron is poured into the receiving part 2, the spherical ball 3 floats to the upper surface of the molten metal after a few seconds, and the molten metal for ductile cast iron passes through the molten metal injection hole 4 into the reaction chamber provided at the bottom of the ladle body l. is injected into chamber la. From the moment the molten metal for ductile cast iron comes into contact with the spheroidizing material 7, white smoke, flashing light, and molten metal scattering phenomena occur due to the spheroidizing reaction.

At this time, most of the white smoke, flashes, and molten metal scattering phenomena can be suppressed by the blocking and white smoke collecting effect of the heat-resistant filter 9, which is made of a porous body with open pores, and also by the heat-resistant filter 9. An increase in internal pressure within the main body 1 can be prevented.

Furthermore, in this embodiment, the spherical ball 3 floats above the molten metal surface due to buoyancy when receiving the molten metal, but when receiving the molten metal is completed, it naturally falls onto the molten metal injection hole 4 and produces white smoke during the spheroidization reaction. This has the effect of completely preventing flash and discharge of molten metal from the molten metal injection hole 4 of the molten metal receiving section 2.

In this way, in this embodiment, the continuous pore heat-resistant filter 9 of the ladle cover 8 prevents an increase in the internal pressure within the ladle body 1, and also prevents white smoke, flashes, and outflow of molten metal. At the same time, it is possible to prevent white smoke, flashes, and outflow of molten metal from the molten metal inlet hole 4 of the molten metal receiving section 2.

A second embodiment of the present invention will be explained with reference to FIG. 3 and FIG. 4 S2.

In this embodiment, a pouring spout 6 that expands laterally in a V-shape is provided in the hot water receiving section 2 of the first embodiment, and the bottom 2a of the hot water receiving section 6 is provided with a pouring port 6 similar to that of the first embodiment. A molten metal injection hole 4 is provided on which a spherical ball 3 is seated. The other parts of the ladle body 1 are the same as in the first embodiment. Also,
The ladle cover 8 is configured to cover the upper part of the ladle body 1 excluding the portion of the hot water receiving part 2, and the slag removal port 105 of the ladle cover 8 is rotatable by a hinge 10a. A heat-resistant filter 9 with open pores similar to the above is provided.

In this embodiment, after the spheroidizing material 7 is introduced into the reaction chamber 1a at the bottom of the ladle main body 1 provided with the hot water receiving part 2, the ladle cover is provided with a heat-resistant filter 9 having a permeable continuous pore structure. 8 is attached to the upper part of the ladle body 1.

In this embodiment, as well as in the first embodiment, in order to prevent part of the white smoke from flowing out from the molten metal injection hole 4 of the molten metal receiving part 2 during the spheroidization reaction of molten metal for ductile cast iron, spherical balls are used. 3 is used as a stopper, but there is a pouring port 6 in the receiving part 2.
By providing this, it is possible to completely prevent white smoke from flowing out from the spout in the first embodiment, and the white smoke suppressing effect can be made even more remarkable.

In this embodiment, the molten ductile iron is poured into the mold with the spherical balls 3 removed.

A third embodiment of the present invention will be described with reference to FIGS. 5 and 6.

In this embodiment, the spherical ball is omitted in the ladle main body 1 in which the pouring port 6 is provided in the hot water receiving part 2 in the second embodiment,
A heat-resistant filter 12 is provided in the vicinity of the pouring port 6 of the hot water receiving part 2, extending downward from the top and having its lower end in contact with the refractory material of the hot water receiving part 2. In addition, the ladle cover 8 equipped with the continuous porous heat-resistant filter 9 does not have the slag removal port in the first and second embodiments, and the ladle cover 8 is equipped with a heat-resistant filter 9 for receiving hot water. It is configured to cover a portion of the ladle body 1 except for part 2. Further, the dimensions of the molten metal injection hole 4 of the order receiving section 2 are formed to be as small as possible in order to suppress the outflow of white smoke as much as possible.

In this embodiment, since the ladle cover 8 is not provided with a sludge removal port, the ladle cover 8 is not provided with a sludge removal port.
There is no choice but to let the white smoke flow out from the vicinity.

In addition, by providing the molten metal injection hole 4 in the receiving part 2,
In addition to being able to remove slag and measure temperature, by making the molten metal injection hole 4 as small as possible, white smoke from the molten metal receiving section 2,
Flash and leakage of molten metal can be suppressed as much as possible.

Furthermore, when pouring molten ductile cast iron into a mold, only the melt field passes through the heat-resistant filter 12 and flows to the royal sprue 6, impurities are prevented from passing through the heat-resistant filter 12, which prevents contamination of impurities during pouring of the molten metal. can be prevented.

As described above, in this embodiment, it is possible to prevent white smoke, flash, and leakage of molten metal from the vicinity of the slag removal port that occurs during the spheroidization process, and also to prevent the molten metal from flowing into the molten metal receiving section 2 equipped with the pouring port 6. , suppressing white smoke leakage.

Slag removal and temperature measurement can be performed, and it is also possible to prevent contamination of impurities when pouring molten ductile iron.

A fourth embodiment of the present invention will be described with reference to FIGS. 7 and 8.

This embodiment has a ladle main body l which has a receiving part 2 and a pouring spout which expands laterally in a V-shape, a reaction chamber is provided at the bottom, and a lower partition wall 5 rising from the bottom wall. A pouring hole 11 is provided on the ladle cover 8 to cover the pouring port 6 of the ladle body 1, and this is attached to the l cover 8 with a hinge lla.

Note that a heat-resistant filter 9 made of a porous material with continuous pores and a sludge removal port 10 are provided in the same manner as in the ladle cover of the first embodiment.

In this embodiment, the pouring locator 11 can prevent white smoke, flash, and leakage of molten metal from the pouring port 6.

Note that the ladle body in this embodiment uses the molten metal injection hole and spherical ball as in the first embodiment,
It is also possible to prevent white smoke from flowing out of the hot water receiving part.

A fifth embodiment of the present invention will be described with reference to FIGS. 9 to 11.

In this embodiment, the ladle cover 8 in the fourth embodiment is modified and improved as described below.

That is, the pouring cover 11 that covers the pouring port 6 of the ladle body 1 is
It is supported around a shaft 13 supported by an upper pillow block 14 attached to the ladle cover 8 as a fulcrum, and can rotate in contact with the recess 16 of the ladle cover 8. Further, below the ladle cover 8, a weight 15 is disposed on the opposite side of the shaft 13 from the pouring cover 11, and the weight 15 is attached to the pouring cover 11 to maintain balance.

FIG. 10 shows the state before and after receiving the hot water in this embodiment. Pouring Rocahar 11 is the ladle body 1? i? JA mouth 6
It has the effect of preventing the release of white smoke that occurs during the spheroidization process of ductile cast iron/8 hot water.

FIG. 11 shows the ladle body 1 tilted at 90 degrees.

The pouring rocker 11 has an automatic opening/closing action that maintains a balanced state even when the ladle body 1 is tilted due to its balance with the weight 15.

Therefore, there is no need for spheroidizing treatment or the number of steps for attaching and detaching the pouring rocker 11 during casting, and the effect of preventing white smoke emission is significant.

[Effects of the Invention] By having the configurations described in each claim, the present invention can bring about the following effects.

(1) The amount of white smoke released into the atmosphere during the spheroidization process of molten metal for ductile cast iron can be greatly suppressed, which is effective for the environment and pollution control.

(2) Flashing light and leakage of molten metal can be prevented, improving safety.

(3) With the above effects, the ladle for ductile cast iron can be downsized.

(4) Splashing of the molten metal is prevented, the yield of spheroidized material is improved, and no special cover material is required.

(5) The number of man-hours required for spheroidizing molten ductile cast iron can be reduced, and workability can be improved.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) are a plan view of a ladle main body according to a first embodiment of the present invention, a partial vertical sectional view taken along line AA' in FIG. Figures (a) and (b) are a plan view and an elevation view of the ladle cover of the same example, respectively, and Figure 3 (a).
) and (b) are respectively a plan view and a vertical sectional view of the ladle body of the second embodiment of the present invention, and FIGS. 4(a) and (b) are respectively a plan view and a longitudinal sectional view of the ladle cover of the same embodiment. Longitudinal cross-sectional view, FIG. 5(a). (b) is a plan view and a vertical cross-sectional view of a ladle main body according to a third embodiment of the present invention, and FIGS. , Figure 7 (a
). (+)) are the plan view and elevation view of the ladle body of the fourth embodiment of the present invention, respectively, and FIGS. 8(a) and (b) are the plan view and elevation view of the ladle cover of the same embodiment, respectively. Front view, Figure 9(a)
, (b) are respectively a plan view and a vertical sectional view of a main part of the fifth embodiment of the present invention, FIG. 10 is a perspective view of the main part of the same embodiment, and FIG. 11 is a tilting view of the same embodiment. FIG. 1... Ladle body, la... reaction chamber. 2... Molten metal receiving part, 2a... Bottom part 83 of the metal receiving part... Spherical ball, 4... Molten metal injection hole. 5...Lower partition wall, 6...Pouring spout. 7... Spheroidizing material, 8... Ladle cover. 9... Porous heat-resistant filter, 10... Sludge removal port. 11... (Main locaher, 12... Heat resistant filter. 13... Shaft, 14... Below block. 15... Weight, 16... Concave part.

Claims (4)

[Claims] (1) In a ladle for ductile cast iron consisting of a ladle cover having a porous body with continuous pores and a ladle body provided with a receiving portion, the ladle communicates with the ladle body formed at the bottom of the receiving portion. A ladle for ductile cast iron, comprising a molten metal injection hole and a spherical ball that is seated on the molten metal injection hole and has a specific gravity smaller than that of the molten metal for ductile cast iron. (2) In a ladle for ductile cast iron consisting of a ladle cover having a porous body with continuous pores and a ladle body having a receiving portion, a molten metal injection hole is provided at the bottom of the receiving portion and communicates with the inside of the ladle body. What is claimed is: 1. A ladle for ductile cast iron, characterized in that the molten metal receiving portion is provided with a pouring port. (3) The ladle for ductile cast iron according to claim 2, further comprising a spherical ball that is seated on the molten metal injection hole and has a specific gravity smaller than that of the molten metal for ductile cast iron. (4) A ladle for ductile cast iron, comprising a porous body with continuous pores, and a ladle cover that has a cover that can open and close the pouring spout in a portion of the ladle body that covers the pouring spout.