DE1134800B - Device for the production of metal castings, in particular composite bodies - Google Patents

Description

The invention relates to an apparatus for producing metal castings, in particular Composite bodies, in which the casting mold is filled in rising cast and after a shell the desired strength has formed, the still liquid inner metal drained down and through Pouring the core material from top to bottom is replaced, with the vent opening below the mouth of the pouring channel is in the lower neck shape.

It is known that in order to produce metal castings, the molten metal goes upwards from the lower neck mold to a mold that has top and bottom molds on the top and bottom End of the base body is connected, cast, after the end of the casting, the metal is sufficient is left to stand for a long time and after the poured metal is on its walls in desired The starch has solidified, drawn off the still liquid inner metal through the lower mold and a second molten metal is poured down from the top of the top mold, so that this replaces the first metal.

It has now been found that, according to the invention, one which is used to keep warm is on the floor the lower neck sand mold arranged storage chamber, on the side of which several with clay, coke or such clogged outlet openings are provided, is particularly advantageous.

The device according to the invention is exemplified below with reference to the drawings described.

Fig. 1 is a longitudinal section of the apparatus for casting chilled cast iron rolls;

Fig. 2 is a section along the line AA of Fig. 1, and

Fig. 3 is a longitudinal section of the apparatus for casting steel blanks.

The base body of the metal mold is above and b with sand molds below, c connected, wherein, for the purpose of an effective heat retention at the bottom of the lower neck sand mold c a storage chamber (sand mold) d is provided. A pouring funnel 1 is located on the side of the lower neck sand mold c, to which a funnel inlet 2 is connected, and outlet openings 3 (whose diameter is between 5 and 25 mm) are attached to the bottom of the storage chamber d, which are filled with clay, coke or the like . are clogged.

In the molds c and b , quenched cast iron e is poured through the funnel inlet 2 and the pouring funnel 1 and after completion of the device for production

of metal castings,
especially composite bodies

Applicant:
Kokichi Otani, Tokyo

Representative: Dr, F, Zumstein, patent attorney,
Munich 2, Bräuhausstr. 4th

Claimed priority:
Japan May 19, 1953 (No. 8923 and No. 8924)

Kokichi Otani, Tokyo,
has been named as the inventor

Poured in for a correspondingly long time. When a quenched outer layer has formed in the base body, one of the outlet openings 3 of the lower storage chamber d is pierced with a sharply pointed rod in order to draw off the molten metal mass, while a second metal is poured in from above. This leakage is appropriately interrupted after the second metal has replaced the first. (Since the diameter of the passage opening is small, the molten metal at this point solidifies when cold metal is brought into contact with it and the pulling is interrupted.) If further replacement of metal is to take place, a new outlet opening 3 is made with the rod pushed in to pull off the molten metal.

This means that even if a replacement is only made after 15 to 30 minutes, for example, the thickness of the first metal can be made arbitrarily strong.

It is also easily possible to make small diameter rollers that solidify quickly, for example those with a diameter of 300 mm and a length of 1000 mm. According to the In accordance with the invention, it is also possible to produce castings in the manufacture of composite rollers, with third, fourth, fifth, and other replacements made. Because the deterred Layer can be made thick, it is

209 630/235

Without using a special mold easily possible to manufacture calibrated rolls by ordinary Rolls are made and the desired profiles are milled on them. For the composition of the cast iron used in this case, the following example serves:

C. Si Mn P. S. Ni Cr Mon V First metal 4.00
3.00
2.6 0.45
1.2
1.5 0.30
0.30
0.30 0.5
0.3
0.3 0.05
0.05
0.05 4.2 1.0 0.28 0.15 Second metal Third metal

When casting steel blanks, the casting mold shown in FIG. 3 is used. Sand molds b, c are attached to the upper and lower end of the metallic base body of the shape α and a storage chamber (sand mold) d, which effectively keeps warm, is attached to the lower end of the lower neck sand mold c.

At the lower neck sand mold a pouring funnel 1 is provided, into which a funnel inlet 2 opens, and at the lower storage chamber d there are also outlet openings 3 (the diameter of which is between 5 and 25 mm) which are clogged with clay. The molten metal is sequentially poured upward into the molds c, a and b through the funnel inlet 2 and the pouring sprue 1, and after the completion of the pouring, the metal is allowed to stand for a period of time. When the metal in the main part of the metal mold α has become sufficiently solid, one of the outlet openings 3 of the lower storage chamber d is pierced in order to draw off the lower molten mass, while a second molten metal is poured in from the upper end of the upper neck sand mold b, so that the second molten metal fills the space of the first. At this time, the aforementioned opening is appropriately clogged. (Since the diameter of the flow opening is small, the molten metal at this point solidifies when cold metal is brought into contact with it, and peeling is interrupted.)

If the replacement of metal is to be continued, a new one is used to strip off more metal Poke outlet port 3, and the mold can be left for a desired time and the replacement be performed. It is also possible, as already mentioned, the solidified layer of the first molten metal in a desired and adequate thickness and if necessary make a third, fourth, and further substitution so as to produce a composite metal blank to manufacture. Such a composite piece can be used with advantage as a starting material for edged tools, razor blades, etc. or used as steel cladding.

The following table gives an example of one to be used in the device according to the invention Composition:

C. Si Mn P. S. Cr Ni First metal 0.10
0.45 0.075
0.35 0.45
0.60 0.05
0.05 0.05
0.05 0.50 1.50 Second metal

Claims (1)

PATENT CLAIM: Device for the production of metal castings, in particular composite bodies, in which the casting mold is filled in the rising cast and, after a shell of the desired thickness has formed, the still liquid inner metal is drained down and replaced by pouring the core material from top to bottom, whereby the outlet opening is located below the mouth of the pouring channel in the lower neck mold, characterized by a storage chamber (d) which serves to keep warm and is located at the bottom of the lower neck sand mold (c), on the side of which several outlet openings (3) clogged with clay, coke or the like are provided are. Considered publications:
German patent specification No. 656 221. 1 sheet of drawings