DE1021235B - Forging paste - Google Patents

Description

The invention relates to a forging paste to facilitate the work of a tool in the mold to be molded Metal, for example in a steel mass brought to the required temperature.

The use of forging pastes, which, in addition to a lubricant such as graphite, finely disperses one Solid material with good thermal insulation, such as mica, glass or asbestos, is known. Such a forging paste is in each case before use of the tool, i.e. before the tool is driven into the metal mass to be processed the tool painted on !.

According to the invention, such a forging paste is improved in that, for example, made of glass or ceramic material consisting of a solid substance in the form of very small spheres in the paste use finds that, at least at the beginning of the blacksmithing process, create a rolling layer between the tool and the workpiece. These beads allow one Rolling of the tool on the metal to be processed in contrast to the known finely divided Aggregates made of solid material, which have any shape of the particles, some with sharp edges and, in the case of refractory material, this shape during the entire machining process maintained and lead to increased friction.

The use of a forging paste according to the invention reduces the wear and tear on the tool reduced to a surprising degree. For example, it had to be used in the manufacture of pipe connections using the previously known Schmiadepaste the cathedral after about ten Work inserts are changed due to wear while using a forging paste with embedded glass beads according to the invention, the same mandrel for the same process can be used at least ten times as often before such wear can be observed, which necessitates the replacement of the mandrel. It should be noted, that the wear and tear of the tool always begins of the blacksmithing process is greatest, namely then, when the tool penetrates the metal, i.e. the actual forging process begins. A little bit later if the material mass is already in motion with its individual molecules shifting against each other, thereby facilitating further penetration of the tool will. This explains the fact that even when forging hot workpieces through the use of glass beads according to the invention, which in the further course of the forging process melt under certain circumstances, the tool wear is reduced as much as it turns out the above example results in the manufacture of pipe connection pieces. Right now where Forging paste

Applicant:
Andre Huet, Paris

Representative:

Dr. W. Schalk and Dipl.-Ing. P. Wirth, patent attorneys, Frankfurt / M., Große Eschenheimer Str. 39

Claimed priority:
France September 17, 1954

the cold thorn coated with forging paste into the If hot metal penetrates, it is spherical in any case The shape of the spheres embedded in the paste is retained and enables the tool to roll off at the first penetration into the metal, during the flow process of the material afterwards itself already begins, so that the rolling movement is then only of less importance and if necessary, only the lubricating effect of the melting glass additive is used, while refractory, for example ceramic beads or glass beads with a higher melting point than that of the metal to be processed retain their rolling function.

In addition to the lower tool wear, the use of a paste according to the invention results in the Another advantage of more uniform machining results, since the friction is not reduced only on the tool, but also on the workpiece has a beneficial effect. Thus indicated connection pieces produced with a paste according to the invention Pipes, in particular with regard to the height and thickness of the nozzle edges, are much more uniform Dimensions as. when using pastes customary up to now with non-spherical inclusions made of solid material.

In the manufacture of connecting pieces to a manifold, apart from a mandrel, is often used on the opposite wall side a die is used,

709 810/183

Claims (1)

which according to the invention is also previously coated with a paste containing beads. at the contact of the surface of the tool, mandrel or die coated with the paste with the Highly heated steel immediately cools the metal on the surface so far that the spheres are still solid remain and by their unwinding a facilitated relative displacement between the mandrel or die and the metal to be forged. The mass of the metal remains at that for the Forging required temperature because it is covered by a layer of heat insulating paste from the Tool is separated and can therefore not be excessively cooled by this. The spheres work on the one hand through their ability to roll and on the other hand through that of them applied thermal insulation. The forging paste according to the invention with very small spheres, the diameter of which is of the order of magnitude is far below 1 mm, can be composed, for example, in the following way: a Third of the volume of spheres, one third of graphite in the form of dust and one third of oil or fat. That Mixing ratio can of course according to the type of metal to be processed and the Forging temperature can be changed. Godfather ν ta ν s ρ r u c H: Forging paste to facilitate the work of a tool in the metal to be deformed a lubricant which, in finely divided form, contains a solid material with good thermal insulation, characterized in that, that the solid substance, for example made of glass or ceramic material, the Has the shape of very small spheres, which, at least at the beginning of the forging process, have a rolling layer between tool and workpiece. Considered publications:
German Patent No. 887 186;
U.S. Patent No. 2,588,625. © 709 810/143 12.57