DD204420A1 - METHOD OF MULTI-TAKING UNWORKED METALLIC FORMING - Google Patents

Abstract

The invention relates to a method for drawing untreated metallic Umformgut, in particular of wire, as it is produced in the metallurgical industry, for example in wire drawing. The object of the invention is to provide a simplified technology with higher quality and effectiveness of the drawing process. The invention is based on the object Umformgut, on the surface of which scale and / or rust particles are, while avoiding a pickling treatment and the use of individual treatment devices reshape and coat so that in the coating subsequent deformation excellent lubrication conditions can be achieved. The object is achieved by the combination of a known forming process with a known lubricant coating, such that a defined in geometry, surface quality and temperature Umformgut a treatment cartridge is fed and contacted in this with a known liquid lubricant, dried and then in one or several forming stages without further addition of lubricant is formed.

Description

233688

(Title of the invention

Method for multiple drawing of untreated metallic remoulding material ₌ '

Field of application of the invention

The invention relates to a method for drawing untreated metallic Umformgut, in particular of wire, as it is produced in the metallurgical industry, for example in wire drawing.

Characteristic of the known technical solutions

When wire drawing solid, semi-solid or liquid lubricants are used to prevent direct metallic contact between the forming material and forming tool. This lubricant supply is done so far appropriate before each forming stage, z. B. is the so-called dry train before the die a lubricant powder bed used. The material to be formed, whose surface is scaled or rusted, must first be subjected to a drying process and a lubricant carrier layer applied. The descaling is carried out by a complex and expensive pickling treatment. For the descaling of unalloyed steel wires, for example, the bending descaling is known. In this case, the wire to be drawn is subjected to a bending stress in two or more planes before entering a lubricant powder bed, broken in the scale and rust layers and the resulting coarse scale and rust particles are blasted off the wire surface. After that, often a "clean" happens

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tion, after the scale and rust parts of the order of magnitude

2 of 3-12 g / m remain on the wire surface, which simultaneously take over the function of Schiniermittelträgers. The remaining rust and scale residues cause disadvantages in the subsequent forming processes z. B. increased Ziehsteinverschleiß or reduction of product quality, such as an increased degree of contamination of the forming material, which has an effect especially in the wire processing industry. For drawing untreated metal forming material, it has already been proposed to clean scaled steel wire after passing through a bending descaling device with the jet of a cleaning liquid containing 6% by weight of calcium stearate with 28 % metal oxide content dissolved in trichlorethylene (DD-WP 148013), a liquid lubricant in which salts of fatty acid are dissolved as lubricant in an organic solvent, applied homogeneously to the material to be formed (WP C 10 M / 205 929) and then dried. The thus-coated Umformgut .Wird then fed to the work drawing stone. For the application of the liquid lubricant, a device has already been proposed in which a closed, with the liquid lubricant-supplied coating container is disposed within a closed lubricant-collecting container (DD-WP 147 207) · For the necessary drying of the applied lubricant layer has already been proposed to transport the coated Umformgut through a condensing chamber, which is equipped with surfaces for the condensation of solvent evaporating from the lubricant layer, wherein the Umformgut either heated introduced into the chamber or heated there and wherein the condensed solvent is collected and fed to a reuse. (DD-WP 148 094)

This .'technology has a number of significant advantages over the traditional technology that uses solid lubricants in powder form. However, it leads to the processing of untreated or in geometry undefined Umformgut to an unstable operation * So a so-called Naßzug with the liquid lubricant described above is not possible as a first stage, at very high forming speeds for the required rapid drying a relatively large Apparative effort necessary, for. B. an additional heating of the Umformgutes. Disadvantages arise from the tolerances usually occurring in the case of untreated formed material for the proposed method. These lead to the fact that an increased expenditure on equipment must be driven in order to meet the requirements of occupational health and fire protection when lubricants containing organic solvents are used. A certain disadvantage is also to be seen in the fact that not all process conditions and not all materials for subsequent forming operations sufficient residual lubricating film is present on the Umformgut, which emerges from the drawing cylinder, so that in these cases in new process steps, a new application of lubricant are applied got to. The remaining on the Umformgut lubricant residue can also interfere in certain cases in the further processing of finished drawn material, for example, in its further processing to Sch ~ tear electrodes with respect to a proper direction, cutting process and coating with the flux or in the wood screw production, in which Restfilm undesirable lubrication conditions in the press can occur. However, quality features of the lubricant residue are only ensured for certain strengths of the material to be formed and in compliance with special process conditions.

Object of the invention

The object of the invention is to provide a simplified higher quality technology for drawing untreated metallic workpieces as well as to increase labor productivity while providing conditions for reducing tool wear.

Explanation of the essence of the invention

The invention is based on the object Umformgut, on the surface of which scale and / or residual particles are, while avoiding a pickling treatment and the use of individual cleaning, coating and drying devices reshaping and coating so that in the coating subsequent forming Excellent lubrication conditions can be achieved while avoiding the formation of a significant amount of lubricant on the formed product.

The object is achieved by the combination of a known forming process, such as dry, with a known lubricant coating, such that a defined in geometry, surface condition and temperature Umformgut a treatment cartridge is supplied and in this with a known liquid lubricant. which consists of a liquid and a solid or semi-solid lubricant contained therein, contacted, dried and then formed in one or more forming stages without further addition of lubricant .. Appropriately, the drying, the coating and drying of the formed material done in a single operation. The invention makes it possible in a particularly advantageous manner, the drawing of non-pretreated metallic Umformgut, that is, the previous separate chemical descaling and applying a lubricant carrier layer are not required. Another significant advantage is that

the tolerances occurring in the untreated Umformgut incfer rule in the first forming stage with lubricant PuI-spill are equalized. Thus conditions for a low expenditure on equipment, for the coating 'with liquid lubricant and production stability at high degrees of deformation in the first forming stage are given? It is also advantageous that the Umformgut is not only transformed in the first forming stage, but also after the first work drawing stone with a homogeneous, uninterrupted, adherent and solid lubricant film is coated and can be fed to the immediately following Umformstufen, without further addition of lubricant must be done. Since the loose lubricant and scale particles entrained by the first working trowel can fall off before coating, a detachment and cleaning of the formed material is associated with the coating in the liquid jet and no further lubricant is supplied in the subsequent forming stages, but only stripped off inevitably a very small amount of lubricant. the Umformgut and thus a low lubricant consumption. It should also be emphasized that low residual moisture on the Umformgut evaporated by the Umformwärme generated and can escape as water vapor and thus reaches a guaranteed dry Umformgut for coating. Since in the first forming stage, the solid lubricants adhering advantages, in particular their high dynamic viscosity come to advantage, the degree of deformation for different strengths of the Umformgutes be chosen so that by the resulting forming heat-drying the liquid lubricant after coating without special drying equipment as necessary in the already proposed procedure. At the same time, this also eliminates the possibly necessary means for recovering the evaporating from the lubricant layers organic solvent.

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The method according to the invention is distinguished from the known method primarily by the fact that the technological difficulties occurring when pulling untreated metallic reforming material are eliminated from the outset. By means of the invention, higher drawing speeds and degrees of deformation are possible, the die wear and energy consumption can be reduced and products with very good quality parameters can be produced.

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embodiment

In the drawing, the scheme of Yerfahrensablaufes for the drawing process of the formed material is shown.

Scaled unalloyed electrode core wire initially passes through a bending descaling device for the purpose of descaling. Thereafter, the steel wire is passed through a Schmierst off powder bed and formed in a drawing die (dry train). Calcium stearate is used as the lubricant powder bed. The steel wire, without lubricant, leaves the workhook as a steel wire defined in geometry, surface condition and temperature. By reshaping the initially untreated electrode core wire, roundnesses are eliminated and a tolerance reduction is achieved. The surface roughness is reduced, the surface being almost scale free. An optimal temperature for the further treatment of the Umformgutes is achieved by deliberate choice of the degree of deformation in the drawing process, lach leaving the Arbeitsziehstein the steel wire passes through a raumluftumgebene free distance and is then passed through a chamber within a treatment cartridge, in the beam with a liquid lubricant rinsed according to DD-WP 217 938 still existing Zunderteilchen and at the same time a coating for subsequent drawing stages takes place. The steel wire leaves the chamber dry with a lubricating film and is then converted into 3 "to 4 stages without further addition of lubricant.

Claims (2)

Eriindungsanspruch. 1 ♦ A process for Mehrfachziehen of untreated metallic Umformgut, which is supplied for the removal of surface on the scale or rust particles of a mechanical descaling, characterized by the combination of a known forming process, such as dry, with a known Schmierst coating such that a in geometry, surface texture and 'temperature defined Umformgut a treatment cartridge is supplied, and in this mit.einem known liquid lubricant, which consists of a liquid and a solid or semi-solid lubricant contained therein, contacted, dried, and then in one or more forming stages is reformed without further addition of lubricant. 2. "/ Experienced according to item 1, characterized in that suitably the drying cycle ', the coating and drying of the formed material takes place in one operation. For this a sheet drawing