SU625621A3 - Lubricant for hot working of metals - Google Patents

Description

alkylene polymer or copolymer and dispersant. Composition of lubricant, wt.%: Alkylene polymer or copolymer 2-45 Disperser 0.5-8-8 Graphitdo 100 A lubricant is obtained by dry mixing graphite, alkylene-new polymer or alkylene copolymer and dispersant. Directly over use, the mixture is suspended in water until a suspension is formed, containing preferably 5-80% by weight of solid substances. Alkylene polymers or alkylen copolymers are expediently prepared by emulsion polymerization. For example, polymers or copolymers of vinyl acetate, vinyl propionate, vinyl laurate, allyl esters, mono- or di-olefins (ethylene, butadiene), acrylic acid and its esters, acrylic acid and its esters with copolymers of nonsaturated compounds can be used. dicarboxylic acid esters, for example, with maleic acid ester. In order to achieve an optimal lubricating effect, the lubricating film must be dry. An aqueous suspension containing a lubricant is purposefully applied to a hot tool, for example, by spraying or spreading, the water evaporating and the polymer or copolymer forms, melting, a film 0.05-1.0 mm thick, preferably 0.1 -0.2. In this film, graphite particles are distributed evenly over the entire surface in the form of plates. The polymer or copolymer burns in the process without any residues. Combustion causes the formation of a gas cushion supporting the separation of the rubbing surfaces. At the same time, graphite provides a durable separating and lubricating layer under conditions of high loads and temperatures. It can be assumed that during the combustion of the proposed additives, a kind of protective atmosphere is formed between the blank and the tool, which delays the combustion of graphite at elevated temperatures. The size of the graphite particles used in this lubricant is preferably not more than 300 mmk with a purity of at least 96%, more preferably up to 100 mm with a purity of 99.5%. A polysaccharide, alkyl cellulose, for example methylcellulose / or alginate, can be used as a dispersant. a small amount of wetting agent, antimicrobial additives, corrosion inhibitor can be added to the suspension. The proposed lubricant is used to deform metal without chips, for example, in stamping workshops, mainly for mandrel mandating in the production of seamless pipes, for example, in so-called piligrim, continuous or PM-mills. Example 1. A lubricant of the following composition is prepared, wt.%: A copolymer of vinyl acetate and ethylene4 Polysaccharide1 Graphite- 95 The resulting composition is mixed with water to obtain a 5Q% suspension, and sprayed onto a warm tool for forging seamless pipes. This composition is suitable for processes in which the lubricating film is subjected to high temperature transformations for a long time. The lubricant composition allows the lubricating film to be sprayed onto the surface of the mandrel during its reverse movement. A dry, water-repellent film is immediately formed on the hot surface of the mandrel. Once the film has been applied, the mandrel can be cooled in a water bath or by spraying water under pressure without flushing the lubricating film. This film is not destroyed even with intensive cooling of the rolls with water to which the mandrel is subjected at the beginning of the rolling process. Example 2: Preparing a lubricant of the following composition, wt.%: Polyisobutylene 45 Methylcellulose 2 Graphite53 The resulting composition is not.v; mixed with water to obtain a 25% suspension. This composition is also suitable for the continuous production of pipes, in particular, with small gaps between the passage of individual lanes. High polymer content provides high thermoplastic properties. Froze A lubricant of the following composition is prepared, wt.%: Styrene-butadiene copolymer 30 Methylcellulose 0.5 Graphite 69.5 The composition is used in the form of a 30% suspension. Example 4. A lubricant of the following composition is prepared, wt.%: A copolymer of vinyl acetate and ethylene 2 Polysaccharide 8 Graphite 90 Composition used in the form of a 20% suspension 562 Conducted tests of the compositions 2, -3 and. 4, comparing them with the BECTHfcOM composition adopted as a prototype and consisting of a mixture of 10% by weight sodium fluoride and 90% by weight of griffite. In order to impart a known composition in a flowing state, it is stirred in a solution of sodium metaphosphite. The table presents the results of these tests in the continuous production of pipes in a continuous mill.

Energy absorption on one bed (shaft)

As you can see, the application of the proposed lubricant requires less energy in the rolling process, while providing a lower roughness. Roller brushes worked much calmer, the service life of the mandrels used in the manufacture of seamless pipes increased by 30%. The surface of the processed products is clean, without visible traces of lubricant after rolling on the proposed formulations.

During the process of forging special steels on pilger mills, before the need to replace the mandrel, 150 pipes were made on the proposed composition of Example 3 and 80 pipes on a known composition. During the rolling of high-grade steel, it was processed into sheet piles before the need to replace the profile rolls on the proposed composition of Example 4 1800 tons, on the well-known 567 tons.

Claims (4)

Thus, the proposed composition has high suspending properties in water, ensures clean combustion of lubricant without the formation of gaseous oil waste contaminating the environment, while the surface of the mandrel is clean without any residues. The force required to pull the pipes through the rolling mill is significantly reduced, the rolling stands work more evenly, and the wear of the mandrel is greatly reduced. The pipe evenly embraces the mandrel, which causes an increase in surface quality. In addition, it is possible to produce pipes with thinner walls using an existing installation. The invention is a lubricant for the hot treatment of metals based on graphite, which is so that, in order to increase the lubricating properties and pumping the surface to be treated, the lubricant 18 additionally contains an alkylene polymer or copolymer and a dispersant at the following content of components, wt.% Alkylene polymer or copolymer 2-45 Dispersant. 0.5-8 Grafitdo 100 Sources of information taken into account during the examination: 1. Weiler S.Ya., Effect of lubricants in the processing of metals by pressure. M., USSR Academy of Sciences, 1960, p. 190-198. 2. Patent of Germany No. 2046727, cl. 23 of 1/04, 1973. 3. Patent of Germany No. 2154232, cl. 23 of 1/04, 1973. 4. Patent of Germany No. 2028804, cl. 23 from 1/01, 1973.