DE1115680B - Process for the production of very thin metal moldings - Google Patents

Description

GERMAN

PATENT OFFICE

L36437Ib / 7b

REGISTRATION DATE: JUNE 27, 1960

NOTIFICATION OF THE REGISTRATION AND ISSUE OF THE
EDITORIAL: OCTOBER 26, 1961

The main patent application concerns; a procedure for the production of very thin, bare and metallic wires by pulling with a later to be removed again, easing the pulling, whereby the new and progressive seen in it was that for the production of the coating a material with a compared to that of the drawing material used and the coating removed by evaporation after drawing will.

According to the invention, there is now a substantial improvement and simplification of the same Way to be rolled thin metal strips and strips or the like. Applicable method seen therein, that an electric current is passed through the metal moldings to evaporate the coating will.

The inventive method is of particular advantage when it comes to the production of in closed flask or similar vessels housed fine wire resistors is because then, according to the invention, the drawn or rolled metal moldings before the coating is evaporated placed in the piston, melted down with the supply wires and there through current passage can be evaporated. The passage of current can also be carried out on a transformer basis Ways to be achieved; In particular, it is also possible by means of high-frequency heating acting from the outside to generate an eddy current in the metal moldings.

Particularly when it comes to metallic coating materials, precautions must be taken be that when the connecting wires evaporate, they will not pass through the deposited metallic Condensate can be connected directly. The control of the condensation process during evaporation leaves through increased heating in the area of the feeder wires and cooling in the desired area Perform condensation area.

Further details and features of the invention emerge from the following description of a preferred embodiment, which is illustrated in the drawing.

The drawing shows schematically a fine wire stretched out in a glass envelope during evaporation of its cover.

The resistance wire 1, which has already been drawn and still provided with the coating to facilitate the drawing is provided with lead wires 2 and 3 at both ends. The feed wires are preferably already before the last reduction in cross-section with the

Method of manufacture
of very thin metal parts

Addition to patent application L34181Ib / 7b
(Interpretation document 1108 645)

Applicant:

Hans Laske,
Hamburg-Bahrenfeld, Luruper Chaussee 73

has not yet been connected to the sheathed resistance wire 1 to facilitate the pulling process. With the help of the two feed wires 2 and 3, the resistance wire 1 has been melted into a glass bulb. The connection nose 5 provided on the glass bulb 4 and closable by melting serves to fill the bulb 4 with a protective gas or the like. If necessary, a particularly suitable protective gas can be used to prevent oxidation during the evaporation process, which is sucked off again after evaporation and replaced by the gas required for using the resistor, for example hydrogen.
The evaporation of the coating enveloping the wire 1 takes place in that the switch 6 is closed in order to pass a current from a current source 7 through the wire 1. The resistor in connection with the ammeter 9 is used to regulate the current intensity.

In order to prevent the coating surrounding the wire 1 from being in an uncontrolled manner during evaporation condensed on the walls of the piston 4 and possibly if it is a metallic one The plunger is a coating that creates a short circuit between the two feed wires 2 and 3 4 in the area of the two feed wires 2 and 3 is strongly tapered in the manner of a tube, so that one can at this As shown, coils 10 and 11 can be pushed over by connection to a high-frequency heating current generator 12 within the piston 4 in the region of the feed wires 2 and 3 generate so strong heat that there is no one there

109 710/208

Condensation can occur. When the feed wires are provided for the resistance only at one end of the piston, is sufficient to prevent condensation generally a single inductor coil. In the embodiment shown in the drawing, one of the inductor coils can also be used can be omitted if a capacitive influence on the resistance by a one-sided connected Coat of condensed metal is irrelevant.

In order to direct the condensation of the evaporated coating to certain points, one can use these Provide additional cooling, for example the cooling jacket 13 shown in the drawing.

Instead of heating the wire 1 through the direct passage of current, it is also possible to use a transformer Ways a passage of current is forced or by one acting from the outside High frequency heating causes an eddy current flow in the conductor 1.

The casing or the piston of the resistor does not necessarily have to be made of an insulating material to exist, it can also consist of metal, in which case the supply lines accordingly are isolated.

If, instead of a coating metal, an insulating material with a correspondingly low level is used Boiling point, so in general no special precautions need to be taken to achieve the Direct condensation of the evaporating coating in some form.

The method according to the invention is not limited to wires, but can of course can also be extended to any other thinly stretched metal moldings. With these metal moldings is primarily intended for thin profiles, such as strips and ribbons, such as those used, for example, as Use translucent foils for capacitive surface lights based on electroluminescence can. Very thin metal strips or plates can also be used for electrostatic shielding and use it as a contrast filter in the manufacture of cathode ray tubes.

Since the heating of metal objects, especially wires, strips and sheets, by means of the passage of current, among other things, in sculptural shaping, in drying and in the Heat treatment of these objects is something common per se, comes from claims 1 to 7 only the meaning real, d. H. made-up under-

claims whose teaching is only intended to be meaningful in connection with those of the main patent.

Claims (7)

PATENT CLAIMS: 1. Process for the production of very thin, elongated metal moldings, such as thin wires, strips, ribbons or the like, by drawing or rolling with a coating that facilitates drawing, which has a boiling point below the melting point of the metal and which is removed by evaporation after drawing or rolling is, according to patent application L 34181 Ib / 7b, characterized in that an electric current is passed through the metal moldings (1) to evaporate the coating. 2. The method according to claim 1, in particular for producing in closed flasks or like vessels accommodated fine wire resistors, characterized in that the drawn or rolled metal moldings (1) before the evaporation of the coating in the flask (4) introduced, melted down with the supply wires (2, 3) and there by current flow be heated. 3. The method according to claim 1 and 2, characterized in that the current flow on a transformer Ways is achieved. 4. The method according to claim 2 and 3, characterized in that the condensation of the evaporated Coating material, especially in the case of metallic coatings, by different Heating or cooling of the piston (4) is limited to previously determined areas of the piston will. 5. The method according to claim 4, characterized in that the piston (4) in the region of Feed wires (2, 3) during evaporation by inductive, preferably high-frequency heating is heated with the coils (10, 11) pushed over. 6. The method according to claim 4 and 5, characterized in that the central part of the piston (4) to promote condensation during evaporation is cooled with a cooling jacket (13). 7. The method according to claim 1 to 6, characterized in that the evaporation of the coating takes place in a protective gas atmosphere. Considered publications:
German patent specifications No. 939 692, 886 605,
723 015, 621466; Belgian patent specification No. 529 239. 1 sheet of drawings