SU1447462A1 - Method of drawing wire from magnesium alloys - Google Patents

Description

(21) 4034960 / 23-02

(22) 01/11/86

(46) 12/30/88. Bup. No. 48 (71) Institute of Metallurgy nm. AABaikova and the All-Union Scientific Research Institute of Light Sources

(72) L.L.Rohlin, I.E.Tarytina, S.S. Kholschevnikov, V.E. Demyshev, G, V.Nesenenko and Yu.I.Shushpanov (53) 621.778.1 (088.8) (56) Hami G.R. Wire drawing from non-ferrous metals. M .: Metallurgi, 1967, p. 119.

USSR author's certificate 186379, cl. B 21 C 1/00, 1969.

(54) METHOD OF DEVELOPING WIRES FROM MAGNESIUM ALLOYS

(57) The invention relates to the production of wire from magnesium alloys by drawing. The purpose of the invention is to prevent the front end of the workpiece from breaking. Before entering the die, the billet is heated to 450-500 ° C, and the spinnerets are heated to 370-420 ° C. The workpiece is repeatedly dragged, heated, and (the die is maintained at the specified temperatures, this ensures the required strength properties of the front contour and prevents its breakage. 1 tab.

This invention relates to the production of wire 13 of magnesium alloys by drawing.

The purpose of the invention is to prevent the front end of the workpiece from breaking.

The method is carried out in the following manner.

A magnesium alloy rod obtained by hot pressing from an ingot is used as a blank. Many times drawing is carried out on a drum-type mill. Before drawing, immediately before the mold, the workpiece is heated, for example, in a tubular electric furnace up to 450-500 s with continuous movement of the workpiece during execution at a speed of 10-12 m / min. Immediately after the furnace, the workpiece enters the die plate heated to 370-.

Then the drawing process is repeated many times. Before entering the workpiece, a sheath is applied to it with a graphite and an itinerant colloid lubricant. Increasing the temperature above causes the workpiece to catch fire.

Lowering the temperature below 450 ° C leads to the breakage of the front end of the billet due to the fact that the process of metal softening does not take place sufficiently.

A lower heating temperature of the spinneret leads to a disconnection of the exit end of the core due to an increase in the resistivity of the metal of plastic deformation during the drawing process. This is due to a decrease in the temperature of deformation due to a decrease in temperature.

Heating the spinner above also leads to a breakage of the output end. wire due to its reduced strength

P r and m er. Magnesium wire drawing is conducted under the following conditions. As the initial billet, 3 mm diameter shafts were used, which were obtained by hot pressing (extrusion) from an ingot. The rod was drawn on a drum-type drawing machine. MV-3000 VM. The bar was preheated, and then billets of intermediate dimensions obtained from it were carried out in a tubular electric furnace heated to 450-500 s with continuous movement.

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blanks in the process of drawing at a speed of 10-12 m / min. Due to the low speed of the billet drawing and its small cross section, the billet took its temperature during the movement in the tube furnace. Immediately after the furnace, the billet entered the die plate heated to 370–420 °. The die was used from a diameter of 3 mm to 1 mm through 0.1 mm, then through 0.05 mm. Before the blank was brought into the furnace, graphite-colloidal lubricant was applied to it.

More specific examples of the implementation of the proposed method of wire drawing are presented in the table.

Testing of the proposed method of drawing was carried out on three alloys of different composition: Mg — 1.04% Ca, Mg — 1.097 a Ca — 0.55% Ce and Mg — 5.4% U. In all cases, the heating of the tubular electric furnace which passes the workpiece, up to 450-500 C and heating the die to 370-420 ° C provides satisfactory wire drawing without obryshov. Increasing the temperature in the tubular electric furnace above leads to the ignition of the workpiece, a decrease below 450 C causes a break in the output end of the wire. Lower than the heating temperature of the die, it also leads to the tip of the wire. Heating the spinneret above 420 C also leads to the output end of the spindle) due to its low density in this case.

The use of an axial drawing method makes it possible to obtain a wire of magnesium alloys of various compositions of large length with a cross section diameter of up to 0.6 mm with strict control of the cross section size. The proposed method can be carried out on industrial drawing wire drawing machines, where the heating of the wire and the spinnerets is provided. Magnesium alloy wire can be used in various technical fields, including for the manufacture of starters for fluorescent lamps.

Claims (1)

Invention Formula The method of drawing from magnesium alloys, including preheating of the workpiece and a series of successively arranged, through which the workpiece is repeatedly pulled, is about the same, so that, in order to prevent the front end of the workpiece from breaking, the preform is heated to 450-500 s, and the dies are heated to 370-420 °. Examples of carrying out the method of drawing a wire of magnesium alloys at different temperatures of heating the billet and nozzles g - 395 440 You are broken, 04% of the tail end of the wire (without forming a neck) 450 The dragging process proceeds satisfactorily without cliffs. 475 The dragging process proceeds satisfactorily without cliffs. 500 The dragging process proceeds satisfactorily without cliffs. 510 The furnace melts and burns. 475 The output end of the wire is broken (without forming a neck) Dragging process satisfactory without cliffs Dragging process satisfactory without cliffs Dragging process satisfactory without obryuov There is a break in the output end of the wire (with a pronounced neck) : Ei: ic: z: ii ::: zz ::::::; r one g -395440 There is a breakage , 09% sa-ny end of the wire , 55% Ce. (. Without necking) 450 The dragging process proceeds satisfactorily without cliffs. 475 The dragging process proceeds satisfactorily without cliffs. 500 The dragging process proceeds satisfactorily without cliffs. 510 The workpiece is reflowed and ignited in the furnace. 360 475. The o6 i% iB output end of the wire occurs (without forming a neck) 370 dragging process satisfactory without cliffs " 395 Dragging process satisfactory without cliffs 420 Dragging process satisfactory without cliffs 430There is a break in the output end of the wire (with a sharp neck) g - 5.4%. At 395,440. The output end of the wire is broken (without forming a neck). I 450 The dragging process proceeds satisfactorily without cliffs. 475 The dragging process proceeds satisfactorily without cliffs. 714474628 Table continuation I: I Z: I: II :::: I :::: E :: I: 500 The dragging process proceeds satisfactorily without cliffs. 510 The workpiece is reflowed and ignited in the furnace. 360 475 A wire breakage occurs at the wire end (without neck formation) 370 dragging process satisfactory without cliffs 395 Dragging process satisfactory without cliffs 420 Dragging process satisfactory without cliffs 430There is a break in the output end of the wire (with a sharp neck)