DE1065122B - Lubricants for extrusion and hot working of metals and alloys - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

PATENT LETTER 1 065

REGISTRATION DAY:

NOTICE
THE REGISTRATION
AND ISSUE OF
EDITORIAL:

ISSUE OF
PATENT LETTERING:

kl. 23 c 1/04

INTERNAT. KL. C 10 HI

MARCH 31, 1958

SEPTEMBER 10, 1959 FEBRUARY 25, 1960

AGREES ABOVE WITH EDITORIAL 1 065 122 (C 16569 IVc / Sä c)

The aim of the invention is, in general, the conditions in hot extrusion of metals and alloys, especially metals of great toughness and high melting point, such as nickel, its alloys and all types of steel.

The extrusion of these metals usually only takes place under very high pressures and at a cost rapid wear of the dies. In order to reduce this wear and tear and the expulsion of the To make the strand easier, you already have a lubricant for working at high temperatures applied, which consists of a composition that more or less colloidal graphite as the basic substance contains. The film that is placed over the metal to be pressed is thin and only adheres imperfect on the die. While at the beginning of the process, the pressed product through a Too much graphite is smeared, and you end up with it of the pressing process almost in direct metallic contact with the die: tearing occurs the lubricant film and, as a result, surface damage and grooves on the strand.

In order to replace this type of lubricant, it has been proposed that between the pressing tool and one end of the block to put a disk of glass mass, under the action of the metal accumulated Heat melts into a sticky mass, creating a lubricating film around the metal forms.

In order to counteract the cooling of the block, it has already been proposed in the same way to use agglomerated porous lumps (godets), which consist of an exothermic mixture, to which graphite is preferably added and which partially reacts and secondarily also has a lubricating effect.

The invention relates to a lubricant which is suitable for the metal to be pressed immediately before to encase its entry into the die and to adhere to the metal in such a way that it, together with the press metal, flows into the die without interruption points being formed. This lubricant consists essentially of a homogeneous, anhydrous mixture of graphite and sugar, the mixing ratio resulting from the type of pressed metal. This mixture will either prepared immediately at the moment of its use or in advance by stirring or as a suspension in oil or mineral or vegetable fats'

It is observed that the sugar is converted into a viscous substance at the pressing temperature Adhesion of the lubricant to the work surfaces the die and the surface of the press lubricant for extrusion

and hot working of metals

and alloys

Patented for: «

Comptoir Lyon-Alemand,
Louyot & Cie. SA, Paris

Claimed priority:
France from April 1, 1957

Yves Terras, Bondy (France),
has been named as the inventor

metal ensures that it is much more reliable and is more stable than can be achieved with known means that either become viscous, such as z. B. glass, or completely in the liquid state, such as. B. Soda.

example 1

A mixture made by adding Madagascar graphite scales a suspension of colloidal graphite has been produced in the cold state 1 to 100 percent by weight of sugar is added as required, depending on the temperature and the type of sugar processing metal or alloy. The mixture is then stirred.

For example, the following proportions in percent by weight are most advantageous for the extrusion of nickel:

Colloidal graphite in suspension 48.5Vo

Common Madagascar graphite in

Scale form 38.5%

Sugar ... · .. 13 ° / <>

.909 716/225

Example 2

Madagascar graphite flakes and sugar are added to a sulfur-free vegetable or mineral oil the following ratio:

Graphite flakes 1 to 95%

Sugar 1 to 95%

Rest oil

Example 3

Sugar is used which only contains traces of more or less colloidal graphite.

This lubricant can be applied directly to the face of the block that first comes into contact with the die, or in the form of a cylinder of small height, which one in the The moment of pressing between the die and the block.

The lubricant can be applied directly. However, it may also be necessary on To apply an adhesive layer to the carrier of the lubricant, which is produced by having it with coated with colloidal dissolved graphite, which is then placed in a drying chamber or by infrared radiation dries or hardens.

This lubricant is the same for all types of hot working of metals and alloys suitable, but especially for the warm hole, en of metal blocks, if this work process outside taking up an extruder takes place.

Claims (4)

Patent claims: 1. Lubricants for extrusion and hot working of metals and alloys, in particular those of increased toughness and high melting point, such as. Nickel and all kinds of Steels, characterized in that they consist essentially of a homogeneous anhydrous mixture consists of sugar and graphite. 2. Lubricant according to claim 1, characterized in that the mixture in oil or animal or vegetable fat is suspended. 3. Lubricant according to claim 1, characterized in that it is about 50% suspended colloidal Contains graphite, 40% Madagascar graphite flakes and 10% granulated sugar. 4. Lubricant according to claim 1, characterized in that it contains sugar and graphite flakes contains in a total proportion of 1 to 95% and the remainder is oil. Considered publications: U.S. Patent No. 1,724,134;
French patent specification No. 1 038 836. O909 627/382 9.59 (90Ϊ 716/225 2. 60)