JPH02175065A - Tilting casting method using sand mold - Google Patents

Abstract

PURPOSE:To eliminate defect in a casting at the time of pouring operation and to improve the yield of a product by pouring molten metal into a pouring basin part, tilting and standing the sand mold after storing the molten metal and filling up the molten metal stored in the pouring basin part into a casting cavity in the sand mold. CONSTITUTION:The mold is the sand mold for casting as possible to tilt and arranging a feeder head part 2 at side part of the sand mold 1 and the pouring basin part 3 connecting with the feeder head part 2. At the time of pouring and storing the molten metal 4 into the pouring basin part 3, gas bubble is gotten out from the molten metal 4. The molten metal 4 refined in such way is quietly filled up into the casting cavity 5 by slowly tilting and standing the sand mold 1. Then, involving of gas bubble is extremely reduced and also as scum, etc., is caused to remain in the pouring basin part 3 as cover-state on the molten metal, the involving of the scum, etc., into the molten metal 4 is eliminated. At the time of preparing the sand mold for casting the flat and long casting, by arranging the feeder head part 2 in longitudinal direction, the sand mold may be made to flat, and molding sand can do in little quantity.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention involves casting by gently filling a molten metal into a sand mold casting cavity, increasing the height of the feeder part, and forming an open feeder part. casting method.

And, it relates to a sand mold used in this casting method.

(Prior art) Casting methods using sand molds are widely known, needless to mention in the literature, and the most common method, as shown in Figures 3 and 4, is to place the upper and lower split molds in molding sand. A method of casting by pouring molten metal from the pouring spout, with a pouring spout and a pressurizing effect on the upper mold, but also a feeder section that is not open to the outside of the mold and has a shape that also collects air bubbles in the molten metal. It is.

(Problem B to be solved by the invention) In the conventional casting method using such a sand mold, when molten metal is poured from the pouring hole, air bubbles may be drawn into the molten metal,
The bottom of the pouring section is often damaged by the molten metal, causing sand to get mixed into the molten metal, and casting engineers are working hard to prevent this problem.

In addition, in order to eliminate defects in the castings, the height of the feeder section was increased, and the feeder section was opened to prevent gas from entering, thereby preventing cavities from forming in the castings. Deciding on a casting plan.

However, if the height of the riser section is increased, the height of the sand mold becomes higher, and therefore the amount of molding sand used increases.

As the amount of foundry sand increases, the amount of returned sand to be processed also increases.
There are also many problems in terms of foundry operation management.

The object of the present invention is to eliminate defects in castings caused by pouring work, reduce the amount of molding sand, and improve the yield of products (means for solving the problems). This invention was invented in order to solve the problem of
After pouring and storing molten metal into the pouring receptacle, the sand mold is rotated and raised, and the molten metal stored in the pouring receptacle is filled into the casting cavity of the sand mold and cast. This is a tilt casting method using a sand mold.

Further, a related invention, which is a sand mold used in the above casting method, is a sand mold for tilting casting, characterized in that a feeder part and a pouring part connected to the feeder part are provided on the side of the sand mold. .

(Operations and Examples) In the casting method of the present invention, as shown in FIG. (3), and after pouring and storing molten metal into the pouring pan (3), as shown in Figure 2, the sand mold (1) is gently rotated and raised. ) is gently filled into the casting cavity (5) of the sand mold (1) and cast.

The mold used at this time has a feeder part (2) on the side of the sand mold (1).
This sand mold for tilting casting is provided with a pouring part (3) that communicates with the riser part (2). (See Figure 1) When the molten metal (4) is poured into the pouring pan (3) and stored in the pouring pan (3), air bubbles escape from the molten metal (4).

The thus refined molten metal (4) is gently filled into the casting cavity (5) when the sand mold (1) is gently rotated and raised.

At this time, the entrainment of air bubbles is greatly reduced compared to the conventional pouring method, and the scum remains in the pouring pan (3) in the form of a cap of the molten metal. 4
) will also be eliminated.

When the sand mold (1) is raised, the riser part (2) faces upward and becomes a sufficiently high riser part (2), and also becomes an open riser part, so there is no gas entrainment.

When preparing a sand mold for casting a flat and long casting, if the feeder part (2) is provided in the long direction, the sand mold can be made flat, and then the sand mold can be formed in a direction that intersects with the flat casting.
Since the sand mold is thinner than when a high feeder section (2) is erected, the amount of molding sand is reduced.

Sand casting is more suitable for small-volume production than metal mold casting due to lower mold costs.

(Effects of the Invention) The present invention provides j! After pouring and storing molten metal into the pouring receptacle, the sand mold is rotated and raised, and the molten metal stored in the pouring receptacle is filled into the casting cavity of the sand mold and cast. It is a tilt casting method using a sand mold, and since it is a tilt casting sand mold that has a feeder part and a pouring part connected to the feeder part on the side of the sand mold, it is possible to pour the molten metal from the pouring hole. When pouring, the feeder is heated to prevent air bubbles from being drawn into the molten metal, to prevent the bottom of the pouring part from being damaged by the molten metal and to introduce sand into the molten metal, and to eliminate defects in the casting. There is no need to increase the height of the feeder section, and the feeder section is open, so the amount of molding sand used is small, and the amount of returned sand to be processed is also reduced, which poses problems in terms of foundry operation management. This invention has the advantage of not only eliminating gas entrainment in the casting, but also being less expensive than mold casting and suitable for small-scale production.The present invention greatly contributes to the development of industry. .

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams of the steps of the tilt casting method of the present invention, and FIGS. 3 and 4 are explanatory diagrams of molds of the conventional casting method. 1. Sand mold; 2. Riser section; 3. Pouring section; 4. Molten metal; 5. Casting cavity; 8. ,,frame; ? ,,,,, sprue section.

Claims (2)

[Claims] (1) A feeder part and a pouring part connected to the feeder part are provided on the side of the sand mold, and after pouring and storing molten metal into this pouring part, the sand mold is rotated and raised, and the molten metal is poured into the pouring part. A tilt casting method using a sand mold characterized by filling the casting cavity of a sand mold with stored molten metal and casting. (2) A sand mold for tilting casting, characterized in that a feeder part and a pouring part connected to the feeder part are provided on the side of the sand mold.