JP2676294B2 - Mold for casting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to a mold for gravity casting.

[0002]

2. Description of the Related Art The so-called gravity casting method, in which a high-temperature molten metal is injected into a cavity by gravity, is used to form a highly accurate casting product, and in particular, a mold having high thermal conductivity is used. It is suitable for rapidly cooling the molten metal to obtain a cast product having a fine structure and high strength.

However, in this casting method, the high-temperature molten metal in a turbulent state flows down from the vertical runner to the horizontal runner at a high temperature, so that various foreign substances such as slag in the runner, a mold coating agent, or a hot water droplet are entrained. May enter the cavity and cause foreign matter to get caught.

In order to solve such a problem, until now, the horizontal runner has been lengthened to collect the foreign matter, but even if such a measure is taken, the foreign matter having a small specific gravity is collected. Without flowing into the cavity together with the molten metal, causing the problems described above.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem.
An object of the present invention is to provide a new casting mold capable of reliably collecting all foreign substances having a small specific gravity.

[0006]

That is , according to the present invention , as a mold used for gravity casting to achieve the above object, a fill provided in a horizontal runner leading to a gate portion of the mold.
The upper part of the filter and the squeezing part located downstream of this filter.
The top, the gas trap in communication with the outside each mold with an upwardly formed, Yue gate portion end of Yokoyudo
The molten metal with a specific gravity smaller than that of the molten metal.
Foreign object trap that collects things and slag that collects slag
The trap and the trap are formed so as to be vertically connected .

[0007]

Embodiments of the present invention will be described below. The drawings show one embodiment of the present invention. A vertical runner 1 having an upper end communicating with a sprue (not shown) is formed in a mold body for gravity casting, and a lower end thereof branches into a horizontal runner. Then, from here, it communicates with the filter 3 made of porous ceramics through the squeezing portion 2, and further with the horizontal runner 5 through the squeezing portion 4, and from here through the gate 6 to correspond to the shape of the cast product. It is formed so as to be connected to the lower end of the cavity 7.

On the other hand, in the mold thus constructed, a gas trap 11 communicating with the gas slit 10 is further formed above the filter 3, and a gas slit 12 is provided above the squeezing portion 4. Cavity nesting closeout 8
A gas trap 13 extending in the gap between
The gas trapped by the molten metal, etc., 1
A foreign matter trap 15 for collecting foreign matter having a specific gravity smaller than that of the molten metal is formed upward in the slag trap 14 at the end of the horizontal runner 5 which is collected by the gate 3 and extends beyond the gate 6.

Therefore, When the molten metal in a turbulent state at high temperature is introduced into the vertical runner 1 at high speed from the sprue of the die configured as described above, the molten metal causes foreign matter such as a mold coating agent, slag, or hot water in the vertical runner 1, Entrains the surrounding gas to reach the lower end thereof, and further enters the inside of the filter 3 where it is rectified by removing slag and oxide slag and flows into the cavity 7, while being entrained in the molten metal. The collected gas is collected by the gas trap 11 when the molten metal is rectified in the filter 3, and then flows out of the mold through the gas slit 10. Similarly, the molten metal contracts in the downstream squeezing portion 4. Even when receiving the action, the gas in the molten metal is collected by the gas trap 13 above the molten metal, and is discharged to the outside through the gap between the cavity nest partition 8 and the gas trap 13.

On the other hand, the foreign matter having a small specific gravity, which is not collected by the filter 3 and collected at the tip of the molten metal, is not pushed into the cavity 7 by the flow of the molten metal and is formed in the slag trap formed at the tip of the gate 6. It flows into the inside of 14 together with the slag, where it is separated from the slag and collected in the foreign matter trap 15 above it.

Therefore, the molten metal flows into the cavity 7 after removing most of the slag and gas including foreign matter having a small specific gravity in the process of flowing through this portion, and there is no foreign matter such as dents or pinholes. Will form a good casting.

[0012]

As described above, according to the present invention, Yokoyu
Since a gas trap communicating with the outside of the mold was formed upward on the upper part of the filter provided on the road and the upper part of the squeeze ,
Rectifies the molten metal in the filter and shrinks the molten metal in the squeezing part.
In the process of cooling, the gas trapped in the molten metal is efficiently separated.
At the same time that it can collect, at the end of the horizontal runway that extends beyond the gate , there is a foreign matter trap that collects foreign matter with a small specific gravity in the upper part, and the slag is below it.
Since the trap is formed, the specific gravity is small with the flow of molten metal.
Cross the gates with foreign matter and slag, and
In addition to pushing it to the end part, these are moved to the foreign object according to the buoyancy.
It is possible to separate and collect the lag, and to reliably prevent these from flowing into the cavity, and to form a better cast product free from foreign matter and gas defects.

[Brief description of the drawings]

FIG. 1 is a view showing a main part of a mold that constitutes an embodiment of the present invention.

[Explanation of symbols]

 1 Vertical runner 5 Horizontal runner 6 Gate section 7 Cavity 11, 13 Gas trap 14 Slag trap 15 Foreign matter trap

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Claims (1)

(57) [Claims] 1. A mold used for gravity casting, wherein an upper part of a filter provided in a horizontal runner leading to a gate part of the mold.
On the upper part of the squeezing part located downstream of the filter.
Each of the gas traps communicating with the outside of the mold is formed upward, and the end portion of the horizontal runner is extended beyond the gate portion,
A foreign substance with a smaller specific gravity than the molten metal is collected in that part.
The thing trap and the slag trap that collects the slag
Molds for casting, characterized by being formed by lining them up and down respectively .