JPH0985428A - Stopper type molten metal pouring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the sticking of molten metal to the lower surface of a nozzle and to improve the productivity by forming the inner diameter of a nozzle end part at larger than the diameter of a sprue cup of a mold and bringing the lower surface of the nozzle into close contact with the mold. SOLUTION: The inner diameter (a1 ) of the opening part of the nozzle 2 end part is larger than the inner diameter (b) of the opening part of the sprue cup 4 of the mold 3. By constituting in such a way, the lower surface of the nozzle 2 is made to closely contact with the mold 3 and during pouring the molten metal, the molten metal is not brought into contact with the lower surface of the nozzle 2 and the sticking of the molten metal to the lower surface of the nozzle 2 is eliminated. Therefore, at the time of pouring the molten metal into the mold 3 at the following time, the removing work of the stuck molten metal to the lower surface of the nozzle 2 is unnecessitated. By this structure, the effective operation of the stopper type molten metal pouring device can be executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stopper type pouring device for pouring molten metal by closely contacting a mold and a ladle nozzle.
More specifically, the present invention relates to a stopper-type pouring device in which molten metal hardly adheres to the lower surface of the nozzle.

[0002]

2. Description of the Related Art In a method of pouring molten metal in a stopper type pouring device by bringing a ladle nozzle into close contact with a mold, the pouring speed is increased because the molten metal head in the ladle acts to pour the molten metal. ,
Suitable for casting thin wall castings.

[0003]

However, there are the following problems. FIG. 2 is a sectional view of the vicinity of the nozzle portion of the conventional stopper type pouring device 20. In FIG. 2, 1 is a ladle, 2 is a nozzle, 3 is a mold, 4 is a sprue cup, and 6 is a stopper. When the inner diameter a2 of the opening of the nozzle 2 of the ladle 1 of the stopper type pouring device 10 shown in FIG. 2 is smaller than the inner diameter b of the opening of the sprue cup 4 of the mold 3, the nozzle 2 is poured during pouring.
The molten metal filled in the spout cup 4 contacts the lower surface, and a part of the molten metal contacting the lower surface of the nozzle 2 easily adheres after pouring. Then, the adhered molten metal makes it difficult for the nozzle 2 to come into close contact with the next mold 3. Therefore, when pouring the molten metal into the next mold 3, the molten metal attached to the lower surface of the nozzle 2 must be removed, which requires a great number of man-hours.

The present invention eliminates the step of removing the adhering molten metal by preventing the adhering of the molten metal to the lower surface of the nozzle 2 which hinders the repeated use of the above-mentioned conventional stopper type pouring device, thereby improving the production efficiency. The purpose is to improve.

[0005]

In order to solve the above-mentioned problems, a stopper-type pouring device of the present invention is a stopper-type pouring device in which a nozzle of a mold and a ladle are in close contact with each other for pouring. The nozzle inner diameter is larger than the cup diameter.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings.
FIG. 1 is a sectional view of a nozzle portion showing a stopper type pouring device according to an embodiment of the present invention. In FIG. 1, the same components as those in FIG. 2 described above are designated by the same reference numerals. In FIG. 1, the inner diameter a1 of the opening at the end of the nozzle 2 is the inner diameter b of the opening of the sprue cup 4 of the mold 3.
Is larger. With the above configuration, the lower surface of the nozzle 2 is in close contact with the mold 3, the molten metal does not contact the lower surface of the nozzle 2 during pouring, and the molten metal does not adhere to the lower surface of the nozzle 2. Therefore, when pouring the molten metal into the next mold 3, it becomes unnecessary to remove the molten metal adhering to the lower surface of the nozzle 2.

[0007]

EXAMPLES Examples will be described below in comparison with the examples. (Example) With a Jolt squeeze molding device (not shown),
The injection weight is 46 kg, the inner diameter b of the sprue cup 4 is 80
A green sand mold 3 of mm is formed. As shown in FIG. 3, the nozzle 2 is made of graphite and the inner diameter a1 of the end is 120 m.
The stopper type pouring device 10 is configured as m. When a molten spheroidal graphite cast iron equivalent to FCD370 was poured using this stopper type pouring device 10, a slight amount of molten metal was observed to adhere to the inner surface of the nozzle 2, but no molten metal adhered to the bottom surface of the nozzle 2. . There is no problem in bringing the nozzle 2 into close contact with the next mold 3.

(Comparative Example) As a comparative example, a green sand mold 3 having a spout cup 4 having an inner diameter b of 80 mm was molded as in the case of the embodiment, and the inner diameter a2 of the end of the nozzle 2 shown in FIG.
The stopper type pouring device 20 is configured as m. Then, a spheroidal graphite cast iron melt corresponding to FCD370 was cast.
As a result, a molten metal having a height of 4 mm was attached so as to hang down from the bottom surface of the nozzle 2 to the inner diameter of the sprue 4.

[0009]

As described above in detail, in the stopper type pouring device of the present invention, the inner diameter of the nozzle end is larger than the diameter of the sprue cup of the mold. The molten metal does not contact the lower surface of the nozzle and the molten metal does not adhere to the lower surface of the nozzle. Therefore, it is not necessary to remove the molten metal adhering to the lower surface of the nozzle when pouring the molten metal into the next mold. Therefore, the stopper type pouring device can be efficiently operated.

[Brief description of drawings]

FIG. 1 is a sectional view of a stopper type pouring device according to an embodiment.

FIG. 2 is a cross-sectional view of a conventional stopper type pouring device.

FIG. 3 is a cross-sectional view of the vicinity of the nozzle of the stopper type pouring device of the embodiment.

FIG. 4 is a sectional view of the vicinity of a nozzle of a general stopper type pouring device.

[Explanation of symbols]

1: stopper type pouring device, 2: nozzle,
3: Mold, 4: Spout cup, 5: Molten molten metal, 6: Stopper, 10: Stopper type pouring device of Example, 20: Stopper type pouring device of conventional example,
a1: inner diameter of nozzle of the embodiment, a2: inner diameter of general nozzle, b: inner diameter of sprue.

Claims (1)

[Claims] 1. A stopper type pouring device for pouring molten metal by closely contacting a mold and a ladle nozzle with each other, wherein a nozzle end inner diameter is larger than a sprue cup diameter of the mold.