JPH0985427A - Stopper type molten metal pouring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the sticking of molten metal by arranging a groove and/or a hole penetrating the inner surface of a sprue cup in a mold between the surround of the sprue cup and inner diameter at the nozzle end part to flow the molten metal remained in the upper part of the sprue into the sprue cup. 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 and the groove 8 or the hole penetrated through the inner surface of the sprue cup 4 is arranged in the mold between the mold 3 around the sprue cup 4 and the inner diameter (a1 ) of the nozzle 2 end part. The lower surface of the nozzle 2 is brought into close 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 is reduced. Further, the residual molten metal around the upper part of the sprue cup is flowed into the sprue cup 4 by the groove or the hole penetrated over the inner surface of the sprue cup 4 of the mold 3. By this structure, the sticking of the molten metal to the inner surface of the nozzle 2 is eliminated, and at the time of pouring molten metal into the mold 3 at the following time, the removal of the stuck molten metal is unnecessary, and the production efficiency can be improved.

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 inner surface and the lower surface of a 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. 3 is a sectional view of the vicinity of the nozzle portion of the conventional stopper type pouring device 20. In FIG. 3, 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 end of the nozzle 2 of the ladle 1 of the stopper type pouring device 20 shown in FIG. 3 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.

An object of the present invention is to prevent the nozzle 2 from repeatedly using the conventional stopper type pouring device.
An object of the present invention is to prevent the adhesion of the molten metal to the lower surface, eliminate the step of removing the adhered molten metal, and improve the production efficiency.

[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 inner diameter of the nozzle end is made larger than the diameter of the cup, and a groove and / or hole penetrating the inner surface of the sprue cup is provided in the mold around the sprue cup and the mold between the inner diameter of the nozzle end.

[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 inner diameter a1 of the opening at the end of the nozzle 2 is made larger than the inner diameter b of the opening of the sprue cup 4 of the mold 3. Further, a groove 8 or a hole 9 penetrating the inner surface of the sprue cup 4 is provided in the mold 3 around the sprue cup 4 and the inner diameter a1 of the end portion of the nozzle 2. With the above structure, the lower surface of the nozzle 2 is in close contact with the mold, the molten metal does not come into contact with the lower surface of the nozzle 2 during pouring, and the molten metal is less attached to the lower surface of the nozzle 2. Further, the mold 3 which is the inner surface side of the nozzle 2
Since the groove 8 or the hole 9 penetrating to the inner surface of the sprue cup 4 is provided, the molten metal remaining around the sprue cup flows into the sprue cup 4, and as a result, the molten metal does not adhere to the inner 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 1) Jolt squeeze molding apparatus (not shown)
Then, a green sand mold 3 having a pouring weight of 46 kg and an inner diameter b of the sprue cup 4 having a diameter of 80 mm is formed. As shown in FIG. 3, the nozzle 2 is made of graphite and has an inner diameter a1 of 120 mm at the end.
mm, and further, the sectional view of FIG.
As shown in the arrow A-A view of (b), a width of 8 mm, a length of 20 mm, and a depth of 80 mm are obliquely radially extending from around the spout cup 4 on the inner surface side of the nozzle to the inner surface of the spout cup 4.
The stopper type pouring device 10 is configured by providing the groove 8 of two places. FCD using this stopper type pouring device 10
When 370-corresponding spheroidal graphite cast iron molten metal was poured, it was observed that the molten metal slightly adhered to the inner surface of the nozzle 2, but the molten metal did not adhere to the bottom surface of the nozzle 2. And the next mold 3
There is no problem in bringing the nozzle 2 into close contact.

(Embodiment 2) As in Embodiment 1, a raw sand mold 3 having an inner diameter b of a sprue cup 4 of 80 mm in diameter was produced,
As shown in the sectional view of (a) and the BB arrow view of (b) of FIG. 2, the nozzle 2 is made of graphite and the inner diameter a1 of the end portion is 1
The stopper type pouring device 10 is formed by providing two holes 9 each having a diameter of 20 mm and diagonally penetrating from the top of the spout cup 4 on the inner surface side of the nozzle 2 to the inner surface of the spout cup 4. F using this stopper type pouring device 10
When spheroidal graphite cast iron molten metal equivalent to CD370 was poured,
It can be seen that the molten metal slightly adhered to the inner surface of the nozzle 2, but the molten metal did not adhere 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. In this embodiment, the groove 8 and the hole 9 are provided independently, but even if the groove 8 and the hole 9 are combined, the effect that the molten metal does not adhere to the bottom surface of the nozzle 2 can be obtained. (Comparative Example) As a comparative example, a green sand mold 3 having an inner diameter b of the sprue cup 4 having a diameter of 80 mm was produced in the same manner as in Example 1, and FIG.
The inner diameter a2 of the nozzle 2 end shown in
A stopper type pouring device 20 is configured. And FCD
A spheroidal graphite cast iron melt corresponding to 370 was cast. as a result,
From the bottom of the nozzle 2 so that it hangs below the inner diameter of the sprue 4,
A molten metal having a height of 4 mm was attached.

[0009]

As described above in detail, the stopper type pouring device of the present invention is such that the inner diameter of the nozzle end is larger than the diameter of the sprue cup of the mold, and the mold between the spout cup and the inner diameter of the nozzle end is Since the groove and / or hole penetrating the inner surface of the sprue cup is provided on the nozzle surface, the lower surface of the nozzle is in close contact with the mold, and the molten metal remaining around the spout flows into the sprue cup to reach the inner surface of the nozzle and the lower surface of the nozzle. No molten metal adheres. Therefore, when pouring the molten metal into the next mold, it is not necessary to remove the molten metal adhering to the inner surface or the lower surface of the nozzle. 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 sectional view of a stopper type pouring device according to another embodiment.

FIG. 3 is a sectional view of the vicinity of a nozzle of a conventional 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, 7: Inner surface of sprue cup,
8: Groove, 9: Hole 10: Stopper type pouring device of the example, 20: Stopper type pouring device of the comparative example, a1: Nozzle inner diameter of the example,
a2: general nozzle inner diameter, b: spout inner diameter.

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 the inner diameter of the nozzle end is made larger than the diameter of the spout cup of the mold, and the mold and the nozzle end around the spout cup are A stopper type pouring device, characterized in that a groove and / or hole penetrating the inner surface of the spout cup is provided in the mold between the inner diameters.