US1940737A

US1940737A - Method of casting stereotype plates

Info

Publication number: US1940737A
Application number: US523978A
Authority: US
Inventors: Winkler Carl
Original assignee: Winklor Matern & Stereo A G
Current assignee: Winklor Matern & Stereo A G; Winklor Matern & Stereo A-G
Priority date: 1930-04-19
Filing date: 1931-03-20
Publication date: 1933-12-26
Anticipated expiration: 1950-12-26

Description

Dec. 26, 1933. Q wlNKLER METHOD OF CASTING STEREOTYPE PLATES Filed March 20, 1951 5 Sheets-Sheet l Des. .26, 1933- c. WINKLER METHOD OF CASTING STEREOTYPE PLATES Filed March 20. 1931 5 Sheets-She'et 2 Dec. 26, 1933. c. WINKLER 1,940,737

METHOD OF CASTING STEREOTYPE PLATES Filed March 20. 1961 5 Sheets-Sheet 3 T e J fiwcnzor: C22 hikfi/er .2 W

Dec. 26, 1933. c. WINKLER 1,940,737

METHOD OF CASTING STEREOTYF'E PLATES Filed March 20, 1931 5 Sheets-Sheet 4 Dec. 26, 1933. c. WINKLER METHOD OF CASTING STEREOTYPE PLATES Filed March 20, 1931 5 Sheets-Sheet 5 Patented Dec. 26, 1933 UNITED STATES PATENT OFFICE METHOD OF CASTING STEREOTYPE PLATES Application March 20, 1931, Serial No. 523,978, and in Germany April 19, 1930 1 Claim.

In casting stereotype plates and backing electros under the pressure of the metal in the melting pot, which is controlled by a valve, or other organ, such as is described, for example, in my Patent 1,244,935, it is found that a bur is formed along the edges of the casting, when the parts of the mold are worn and therefore do not fit together quite tightly.

The object of the present invention is to avoid the formation of this bur or ragged edge.

In order to accomplish this, I provide means whereby the metal which flows into the mold during the casting process is not subjected to the full static pressure generated by the metal in the melting pot proper. The result of this is that due to the decreased pressure under which the mold is being filled, the stresses within the mold are reduced to a Plates cast by this method are quite free from all bur along the edges, and the matrices are subjected to less stresses, so that they are not so easily torn or picked.

After the mold has been filled with metal, the contents of the mold, while solidifying, are pref erably subjected to the full static pressure of the metal in the pot, in order to prevent hollow spaces from being formed in the casting.

According to the preferred form of my invention, I provide either an auxiliary chamber or a bye-pass which may be in constant communication with the melting pot proper, or brought intocommunication therewith by means of a valve. This chamber or bye-pass is so arranged that the metal which is to fill the mold will flow from the melting pot through the chamber or bye-pass, and thence-into the mold at a lesser dynamic pressure than would be the case if the metal were to flow direct from the melting pot into the mold.

In the accompanying drawings various-ways of carrying out my invention are shown by way of example, in connection with a melting pot provided with a rotary valve or cock for regulating the flow of metal from the pot into the mold.

Fig. 1 is a diagrammatic section of a pot and mold showing'the valve in closed position,

'Fig. 2 is a section through the same parts in the position in which the mold is being filled,

Figs. 3 and 4 represent another form of pot with the valve in two positions which correspond with Figs. 1 and 2,

Figs. 5, 6 and 7 show another construction of the valve, in three different positions,

Figs. 8 and 9 are sections of another construction of pot with the valve in the closed position in Fig. 8, and in the open position in Fig. 9,

Figs. 10, Hand 12 show a further construction with the valve in three different positions.

The melting pot a (Figs. 1 and 2) against which the mold b is pressed for casting, has a chamber 0, at the bottom, which in the closed contents of the pot. 'venient form, for example holes 6, can be proposition of the valve d communicates with the An air-escape in any convided, in order to enable the metal to flow in. and out of the chamber 0 sufliciently quickly.

When the valve d is turned into the position shown in Fig. 2, the metal flows out of the chamber c into the mold b, without the pressure of the metal in the pot entering into action. Consequently the dynamic pressure, which arises while the form is being filled, is much less than when the metal fills the mold under the full head of the metal in the pot.

The chamber 0 can also extend somewhat upwards, in order to increase the head pressure somewhat, as shown in Figs. 3 and 4. The width of the chamber c can be chosen according to circumstances.

The construction shown in Figs. 5 to 7 differs from that shown in Figs. 1 to 4 by the fact that the valve d which, in the closed position (Fig. 5) connects the contents of the metal pot with the chamber 0, and, in the open position (Fig. 6), enables the mold to be filled under the reduced head of the metal in the chamber 0, can also be turned into a third position (Fig. 7) which allows the full head of the metal in the pot to act on the metal in the mold while it is solidifying.

In the further construction shown in Figs. 8 and 9 a part of the metal pot is divided off by a wall forming a chamber 0 over the valve d, which chamber, by opening the valve (Fig. 9), can be brought into communication with the mold b. This chamber is emptied into the mold, as soon as the valve is opened, but metal flows from the pot through the holes e in the top wall of the chamber 0 and fills this chamber again, so that then the full head of metal in the pot will act on the plate while it is solidifying in the mold.

My invention can also be carried out with a metal pot having no chamber divided ofi, but having a valve d (Figs. 10 to 12) which is first only partially opened through a bye-pass of small section (Fig. 11) so that the metal is throttled in filling the mold, and does not therefore produce so much dynamic pressure. When the mold is full, the valve d is opened entirely (Fig. 12) so that the metal in the mold will solidify under the full pressure of the metal in the pot.

What I claim and desire to secure by Letters Patent of the United States is:

The method of casting stereotyp plates consisting in bye-passing a portion of the metal in a melting pot, filling a mold with metal which passes through said bye-pass and at a lower static pressure than that of the metal in said melting pot, and then putting the full static pressure of the metal in the pot on the metal in the mold while the latter is solidifying in the mold.

' CARL WINKLER.