DE274827C

DE274827C -

Info

Publication number: DE274827C
Application number: DENDAT274827D
Authority: DE

Description

KAISERLICHESIMPERIAL

PATENTAMT.PATENT OFFICE.

PATENTSCHRIFTPATENT LETTERING

- M 274827 KLASSE 42g. GRUPPE- M 274827 CLASS 42g. GROUP

HENRI de LOSTALOT in BILLANCOURT, Sefne.HENRI de LOSTALOT in BILLANCOURT, Sefne.

Verfahren zum Einpressen von Schallkurven in erhitztes Stahlblech.Process for pressing sound curves into heated sheet steel.

Patentiert im Deutschen Reiche vom 15. August 1913 ab.Patented in the German Empire on August 15, 1913.

Die Erfindung betrifft das Einpressen von Schallkurven in erhitztes Stahlblech und besteht darin, daß man zur Erzeugung der Hitze die Elektrizität benutzt, am einfachsten in der Weise, daß man den Hitzstrom durch das Blech selbst lenkt.The invention relates to the pressing of sound curves into heated sheet steel and consists in that one uses electricity to generate the heat, easiest in the way that one directs the heat flow through the sheet metal itself.

Das zu formende Blatt α (Fig. 1) wird z. B. an seinen beiden Enden durch Klemmen b oder Bürsten aus Metall oder Kohle erfaßt, die mit einer elektrischen Stromquelle von einigen Tausend Ampere und einigen Volt verbunden sind. Das Blatt erhitzt sich bis zur hellen Rotglut und wird prägbar; es genügt dann der schnelle Schlag einer Presse oder der Stoß einer Matrize, die unter der Platte d angeordnet ist, um die leichte und genaue Formung herheizufuhren. Die Presse kann von beliebiger Ausführung sein, muß indessen sehr schnell oder durch Stoß arbeiten. The sheet to be formed α (Fig. 1) is z. B. detected at both ends by terminals b or brushes made of metal or carbon, which are connected to an electrical power source of a few thousand amps and a few volts. The sheet heats up to a bright red glow and can be embossed; the rapid blow of a press or the blow of a die placed under the plate d is then sufficient to produce the easy and precise shaping. The press can be of any design, but it must work very quickly or by pushing.

Diese Bearbeitung findet in einem geschlossenen, mit einer Glaswand versehenen Gehäuse von geeigneter Form statt, das mit den für die Handhabungen erforderlichen Durchbrechungen versehen ist. Das Gehäuse wird zweckmäßig in an sich bekannter Weise von einem Strom indifferenten Gases (Stickstoff, Kohlensäure, Kohlenwasserstoffe) durchströmt, die durch das Rohr t eintreten; auf diese Weise kann sich das Blatt nicht in Berührung mit dem Sauerstoff der Luft oxydieren, was von wesentlicher Bedeutung ist, um eine genau geformte Oberfläche für Phonographenplatten zu erhalten. Man kann auch ein teilweises Vakuum in dem Gehäuse erzeugen, um die Oxydation zu verhüten und das Formen zu erleichtern. Die Öffnungen der Glocke c können durch Metallschieber oder Klappen luftdicht verschlossen werden. Die Matrize kann an der Platte d oder an der Platte p, oder es kann, wenn man das Blatt auf beiden Seiten formen will, an jeder Platte eine Matrize oder an der einen eine Matrize, an der andern eine Patrize befestigt werden.This processing takes place in a closed housing provided with a glass wall of suitable shape, which is provided with the openings required for the handling. The housing is expediently traversed in a manner known per se by a stream of inert gas (nitrogen, carbonic acid, hydrocarbons) which enter through the tube t; in this way the sheet cannot be oxidized in contact with the oxygen in the air, which is essential to obtain a precisely shaped surface for phonograph plates. A partial vacuum can also be created in the housing to prevent oxidation and facilitate molding. The openings of the bell c can be closed airtight by metal slides or flaps. The die can be attached to plate d or plate p, or, if the sheet is to be shaped on both sides, a die can be attached to each plate or a die to one and a male die to the other.

Man kann auch eine dieser Platten mit Karton, Asbest, Blei oder anderem weichen Stoff je nach Bedarf überziehen.You can also soften one of these sheets with cardboard, asbestos, lead, or something else Cover the fabric as required.

Eine Abänderung des Verfahrens besteht darin, daß man auf die vorher mit einer Scheibe Asbest bedeckte Platte p ein von dem elektrischen Strom durchflossenes Metallblatt legt; dieses zur Rotglut erhitzte Blatt nimmt seinerseits auf seiner Oberfläche das eigentliche zu formende Blatt auf und erhitzt es durch die Berührung. Die Erhitzung des zu formenden Blattes wird in diesem Falle durch die Elektrizität indirekt bewirkt, anstatt der beschriebenen direkten Wirkung.A modification of the method consists in placing a metal sheet through which the electric current flows on the plate p previously covered with a pane of asbestos; this sheet, which is heated to red heat, in turn picks up the actual sheet to be formed on its surface and heats it up when you touch it. The heating of the sheet to be formed is in this case brought about indirectly by the electricity, instead of the direct effect described.

Man kann auch zwei dünne Blätter, die durch eine dazwischengelegte Scheibe aus Asbest oder einem Blatt von anderem wenigerYou can also use two thin sheets of paper, which are made of a disc between them Asbestos or a sheet of other less

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Claims

hard metal, such as copper or the like. Are separated from each other, shape.

If you want to manufacture the disks by molding them on a rolling mill, you proceed in the following way:

The sheet a to be formed (Fig. 2) is gripped by the rollers d and j> of the rolling mill, which carry the curved die and male mold, which are shown in Fig. 2 by fine teeth. The leaf α can be heated in two different ways:

i. Direct effect. In this case the electric current enters through the roller d , flows through the sheet under heating to red heat and is diverted again by the rollers b , which form the negative pole; the red-hot and malleable sheet is easily embossed between the rollers of the rolling mill.

2. Indirect heating. The sheet α passes between two metal disks e and h which are covered with insulating asbestos. The electric current flows through one of the plates and heats it to red heat.

This plate e represents a kind of furnace in which the sheet fed into the rolling mill is heated. The two types of heating can be used at the same time to enable work to be carried out at greater speed.

The whole rolling mill is enclosed in a closed housing c , through which the inert gases specified above flow, or in which a vacuum can be created if this is preferred.

The leaves can be of any or indefinite length; drums can accommodate the continuous sheets, or they can be cut through as needed at the exit from the rolling mill, if not already in the rolling mill itself as a result of the use of suitable matrices that simultaneously shape, print and can cut off.

As already explained above, here too the leaves can be fed by two through one Layer of asbestos or sheets formed by another softer metal separated from each other the work of embossing is facilitated because of the flexibility of the intervening fabric.

The steel blades are formed and hardened at the same time. For this purpose, the plates d and ft can be made hollow and equipped with a circulation of cold water, as can also be the case with the rolls of the rolling mill.

The metal sheets can also be enamelled, at least in the area to be formed, both to prevent oxidation and to create greater hardness on the surface. The glass-like enamel can be shaped very well in the heat and forms a body with the leaf, providing protection.

The shaped sheets can in turn be used as a die or a male mold, depending on the circumstances to serve.

Patent-A ν Proverbs:

1. Method for pressing sound curves into heated sheet steel, thereby characterized in that the heat is generated electrically.

2. The method according to claim 1, characterized in that the heat flow through the sheet itself is directed.

3. The method according to claim 1, characterized in that between two at the same time a sheet of asbestos or soft metal (copper, Aluminum or the like) is inserted, for the purpose of pressing in the customer facilitate.

1 sheet of drawings.