DE887186C - Process for hot working, in particular for extrusion or drawing of metals - Google Patents

Description

Process for hot working, in particular for extrusion or Drawing of metals Dien invention relates to methods of hot working, especially for the extrusion, drawing, forging etc. of metals where the Metal deformed when it comes into contact with metal tools due to pressure and / or tension will.

Its purpose is to prevent wear and tear caused by the friction of the metal on the tools.

As is well known, the extrusion of metals takes place by one Metal block which, depending on its flowability, is at a more or less high temperature has been brought into the press room of a press and on the one, end with a stamp. exerts strong pressure, according to which the other, front end through an opening of the Prussian part called a die or nozzle is pushed through. When pulling, instead of applying pressure, the rear end is applied of the block exerted a pull on the front end at the outlet of the nozzle.

Means have already been proposed to reduce the wear and tear Sensor and the nozzle, which can be very strong with hard metals. Mainly there are means such as glass, oxides, salts or slag that, between the Block and the parts to be protected, especially the nozzle, placed and melt under the action of heat in whole or in part, thereby creating a assume sufficient liquid state to act as a lubricant that the Sliding of the pressed or drawn metal facilitates and thereby the machining parts protects against too rapid wear.

The method according to the invention consists in that: between the the metal to be machined and the machining elements exposed to wear or Parts of the same a lubricant is placed, which consists of finely divided mica consists.

It has been found that using such a lubricant the wear and tear on these parts is considerably reduced. You can do this result to ascribe to the lamellar structure of the mica, and indeed the success is over thus: the greater the number of leaflets into which the mica is divided is. It appears that the leaflets orient themselves in the direction of flow of the metal and slide on top of each other, whereby the leaflets closest to the metal slide faster than the leaflets further away from it.

The use of mica also has the advantage that this one poor heat conductor is the metal block against the cooling, which he otherwise with would be subjected to contact with the processing parts, and protects him accordingly during the entire processing time at a temperature favorable for the processing ' holds.

According to a preferred embodiment of the invention, the mica in the form of a more or less pliable sheet, similar to a piece of paper or cardboard; used.

You can make sheets or disks from natural mica that look like Look like paper or cardboard. Various working methods can be used to create the mica Divide into extremely thin lamellas, the thickness of which in certain cases is down to micron thickness descends and which have the property of clinging to one another again by themselves. With the help of these mica lamellas, one can go through treatments similar to those the paper industry produce more or less pliable sheets that only consist of Mica exist.

Sheets were also produced, in which the mica lamellae a binder is added.

So there are such sheets of pure mica or of mica with a preferred inorganic binder which, in the above-described embodiment to be needed.

For example, to protect the drawing nozzle, you place it between blocks and nozzle one or more disks made from mica sheets or from a composition of mica leaves and other substances.

One can also cut the block into a sheet before extruding it or drawing it encased from mica or mica compounds.-For example, one can use it 'Wrap it in such a sheet, or put it in a sleeve or sack that contains consists of several layers of leaves. You can also use the inside of the transducer line a press with a lining of mica leaves before inserting the block will.

The sheets or disks of mica or compositions of mica: leaf can be used together with ordinary panes of glass, foam glass, or fritted glass Glass fleeces, felts or fabrics are brought in as the glass itself is a is good lubricant. .

One places z. B. Put a slice of mica paper on the bottom of the press pot and then a sheet of glass or vitreous material with which the to be pressed Block comes into contact. The glass melts, and easily, as the mica does it protects against heat dissipation through the pressed body. It flows to the opening of the nozzle and lubricates them, the sliding effect due to the presence of the mica lamellas is increased considerably.

According to another embodiment, the mica is in the form of the smallest: Related to particles that do not form a coherent mass. You use him z. B. in the form of a powder, with which the metal to be machined or the metal to be protected Surrounding working parts. The powder can e.g. B. be applied by means of a spray gun. If necessary, glass powder can be mixed with the mica powder.

You can add a certain amount of mica powder with the help of a binder Give consistency or incorporate the powder into a paste to make it easy on to be able to apply the block or the tools.

According to the invention, panes made of agglomerated glass can also be used Produce mica particles, and these disks z. B. with drawing nozzles between the Metal to be machined and place the nozzle. The invention is with every processing of metal in which the metal is somehow pressed and / or drawn is subjected.

Claims (9)

PATENT CLAIMS: i. Process for hot working metal in which the metal in contact with metal processing parts by pressure and / or Train is deformed, characterized in that the machining parts by means of a divided mica lubricant can be protected against wear. 2. The method according to claim i, characterized in; that the mica of a pretreatment is subjected to it largely in fine leaflets, z. B. those of about. Micron thickness to subdivide. 3. The method according to claim i or i and 2 ', thereby characterized in that the mica, which is divided into very thin flakes, is in the form of a paper or cardboard-like sheet is used. q .. procedure according to one of claims i to 3, characterized in that one or more of divided mica existing sheets or discs between the to be processed Metal and the tools are placed. . Method according to one of claims i to 3, characterized in that the metal to be worked with one or more is wrapped in sheets made of divided mica. 6. Procedure according to one of claims i to 5, characterized in that the leaves or disks consist of subdivided mica held together by a binding agent. 7th Method according to one of Claims 1 to 6, characterized in that the mica flakes or particles are mixed with glass. S. The method according to claim i, characterized in that that the lubricant consists of a mixture of mica powder and glass powder. 9. The method according to claim i, characterized in that the lubricant of mica powder held together by molten glass. ok procedure according to claim i, characterized in that together with .the lubricant from Mica or mica compositions separate layers from ordinary glass sheets, made of foam glass, fritted glass or glass fiber fleece, felt or woven fabric be used.