DE968852C - Means for cold forming metals - Google Patents

Description

Means for the Cold Forming of Metals The invention relates to Means for the cold forming of metals from water-insoluble metal soaps, the are characterized in that they contain inorganic or organic sulfides, which, like ammonium hydrogen sulphide, are hydrogen sulphide even at ordinary temperatures split off or contain sulfur in a polysulphide-like bond, such as iron (III) sulphide, Ash disulfide, polyethylene polysulfide.

The use of aqueous solutions from water-soluble soaps, fatty alcohol sulfonates, Arylalkyl sulfonates do not contain water-soluble sulfides or polysulfides is known as a coolant and lubricant for the cold forming of metals. So Aqueous coolants and lubricants are for the cold forming of metals applicable of any kind; but their use is often undesirable because the supply and Reclamation of the same requires special facilities, and as one in metal works For reasons of cleanliness, the use of aqueous coolants and lubricants if possible to avoid addiction. For example, wire drawing has been used almost exclusively since time immemorial Dry drawing agents or drawing fats are used.

Can be used as a means for cold forming and a carrier for the sulfides water-insoluble soaps, such as aluminum, calcium and zinc stearates and palmitates, -Oleate etc used. As hydrogen sulfide even with ordinary ones Sulfide which splits off temperature is preferably used as ammonium hydrogen sulfide. Since the water-insoluble metal soaps are able to bind hydrogen sulfide, occurs in the proportions used in practice, there is no odor nuisance. Iron (III) sulfide and especially have proven to be particularly suitable for the purpose of the invention Iron disulfide proved to be some of its sulfur content in polysulfide-like Bond, d. H. by coordinative valences to those anchored by ordinary valences Contains sulfur bound. The sulfur bound by coordinative valences is so loosely tied that it can be reached at ordinary temperature, especially at Presence of moisture; reacts with metals to form sulphides. In the same Organic polysulfides also behave in a manner such as. B. polyethylene polysulphides.

It is known to find naturally occurring molybdenum disulfide (Mo S2) in To be used in powder form or suspended in lubricating oils as a drawing agent for metals. In molybdenum disulfide the two sulfur atoms are on by ordinary valences the metal bound. It therefore only loses part of its sulfur at very high high temperatures. The lubricating effect of molybdenum disulfide is not based on the Creation of a sulphide film on the surface of the workpieces to be formed, but rather is due to the physical properties (lamellar structure, great softness, adhesion) of the natural molybdenum disulfide. Example i 95 parts of aluminum distearate are intimately mixed with 5 parts of solid ammonium hydrogen sulfide. The one made in this way sulphidating drawing powders can be used directly for wire drawing. example 2 90 parts of calcium stearate are combined with 10 parts of iron (III) sulfide in the absence of air ground. Instead of calcium stearate, you can also use a mixture of aluminum and use calcium stearate. The product produced in this way can be used directly as a drawing powder or in the form of a gel dispersed in lubricating oils.

Example 3 95 parts of aluminum stearate are mixed with 5 parts of polyethylene penta- or tetrasulfide intimately mixed. The product produced in this way can be used immediately can be used as a drawing agent. Example 10 parts containing a few percent water Iron disulphide are made in a ball or colloid mill with such an amount of calcium stearate fat ground, that the ground product is one for a wide variety of cold forming purposes is a usable paste with a grease-like consistency.

As far as the technical metal soaps and sulfides used are not already contain water, one can use the means for cold forming according to the invention Incorporate one to several percent of water in order to increase their ability to react. If the iron sulfides do not already contain free sulfur from their production, you can. Their effectiveness by finely divided additives, especially colloidal Sulfur, boost and the iron disulphide by mixtures of iron monosulphide and replace colloidal sulfur.

As with the use of drying agents, even if they are an up contain several percent water and also when the drawing tool is cooled from the outside the drawing nozzle and also the workpiece in the area of the drawing nozzle generate a lot of heat learned, it is compared to the use of sulfide formers in aqueous drawing agents a substantial acceleration of the formation of the sulfide film and an increase the pulling effect achieved.

Claims (3)

PATENT CLAIMS: i. Means for the cold forming of metals from water-insoluble metal soaps, characterized by a content of inorganic or organic sulfides, which, like ammonium hydrogen sulfide, split off hydrogen sulfide at normal temperature or contain sulfur in a polysulfide-like bond, such as iron (III) sulfide, iron disulfide, polyethylene polysulfide. 2. Medium for the cold forming of metals according to claim i, characterized by a Content of iron (II) sulfide, iron (III) sulfide or iron disulfide and colloidal sulfur. 3. Agent for the cold forming of metals according to claim i and 2, characterized by a low water content. Agent for the cold forming of metals according to Claims 1 to 3, characterized by a further content of lubricating oils. Documents considered: German Patent No. 865 175; French Patent Specification No. 890,379. U.S. Patent No. z 588 234.