CN1222373C - Magnesium alloy wire continuous extruding method - Google Patents

Abstract

The present invention belongs to the technical field of the plastic forming of non-ferrous metal, which relates to method for continuously extruding magnesium alloy threads. The present invention is characterized in that an extruding shaft can be divided into a hot extruding shaft and a cold extruding shaft, and an extruding mould, a magnesium alloy ingot of an epibole graphite piece, and the hot extruding shaft are orderly put in an extruding cylinder for the compaction; thereafter, a support pad is put in an electric furnace for being heated to 500 to 550 DEG C and can keep a temperature for 30 minutes. A base is preheated to 200 to 300 DEG C when the temperature is kept, a heat insulating cylinder is preheated to 400 to 450 DEG C, and then the extruding cylinder is taken out with a support pad and is arranged on the base; the heat insulating cylinder is sheathed, the cold extruding shaft is arranged on the hot extruding shaft, and the extrusion is carried out on a pressure machine. When the extrusion is carried out, the magnesium alloy is in a semi-solid state, and simultaneously the outlet of the extruding mould is blown by nitrogen so as to avoid the blowout and to improve the surface quality of magnesium threads. Simultaneously, an extruding speed of the threads can be controlled at 1 to 5 meters /min so as to avoid the breakage, and the heat insulating cylinder is adjusted so that a temperature of the outer wall of the extruding cylinder can be kept at about 400 to 450 DEG C; the present invention has the effects and benefit that the pressure is low when the extrusion is carried out, and the present invention is easy to extrude, is suitable for various pressure machines, has high threading speed, and can prepare continuous magnesium alloy threads.

Description

Continuous extrusion method of magnesium alloy wire

technical field

The invention belongs to the technical field of plastic forming of non-ferrous metals, and relates to a continuous extrusion method of magnesium alloy wires.

Background technique

At present, the application of magnesium alloy is still not widespread. The production of magnesium alloys is mainly concentrated on a small number of profiles such as magnesium alloy tubes or bars. However, the production of magnesium alloy wire has not yet matured process methods. In particular, there is no process for preparing continuous magnesium alloy wires (up to hundreds of meters or thousands of meters).

Contents of the invention

The purpose of the present invention is to provide a continuous extrusion method of magnesium alloy wire. Magnesium alloy wires up to hundreds of meters or thousands of meters can be successfully prepared by this method.

The technical scheme of the present invention is: the extrusion shaft is divided into a hot extrusion shaft and a cold extrusion shaft; an extrusion cylinder, an extrusion die, a cold extrusion shaft, a hot extrusion shaft, a support pad, a base and an adjustable Adjustable heat preservation cylinder; industrial magnesium alloy is melted and cast into cylindrical magnesium ingot, and the side wall and upper surface are covered with graphite sheets, the diameter of which is 1 to 2 mm smaller than the inner diameter of the extrusion cylinder; then, the extrusion die, magnesium ingot, Put the hot extrusion shaft into the extrusion cylinder for compaction; put the extrusion cylinder on a support pad with a middle hole, put it in an electric furnace and heat it to 500-550°C and keep it warm for 30 minutes; while keeping it warm, preheat the base to 200-300°C, preheat the insulation cylinder to 400-450°C; then take out the extrusion cylinder together with the support pad and place it on the base, put on the insulation cylinder, place the cold extrusion shaft on the hot extrusion shaft, and place the extrusion shaft on the magnesium alloy When the ingot is semi-solid, it is extruded on a press; when extruding, nitrogen is used to blow the exit of the extrusion die to prevent fusing and improve the surface quality of the magnesium wire. Control the extrusion speed of the wire at 1-5 m/min to prevent breakage; at the same time, maintain the temperature of the outer wall of the extrusion cylinder at 400°C to 450°C by adjusting the insulation cylinder to avoid extrusion difficulties.

The effect and benefit of the present invention is to provide an effective continuous extrusion method of magnesium alloy wire. The method utilizes the characteristics of magnesium alloys in semi-solid and easy extrusion, and the pressure is low during extrusion; it is suitable for various presses; Thousands of meters of continuous magnesium alloy wire.

Description of drawings

Fig. 1 is a schematic diagram of the device of the present invention.

In the figure 1. Extrusion cylinder, 2. Magnesium alloy ingot, 3. Extrusion die, 4. Hot extrusion shaft, 5. Cold extrusion shaft, 6. Insulation cylinder, 7. Pad, 8. Base, 9. Graphite flakes.

FIG. 2 is a top view of FIG. 1 .

In the figure 1. extrusion cylinder, 5. cold extrusion shaft, 6. insulation cylinder.

Fig. 3 is an I-I sectional view of Fig. 1 .

Figure 8. Base.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Step 1: Use hot work die steel to make the extrusion barrel (1), extrusion die (3), hot extrusion shaft (4), cold extrusion shaft (5), support pad (7), and base as shown in Figure 1 (8). Make adjustable heat preservation cylinder (6), prepare graphite sheet (9), nitrogen.

Step 2: melting and casting the industrial state magnesium alloy into a cylindrical ingot with a diameter 1-2 mm smaller than that of the inner hole of the extrusion cylinder, taking out the surface oxide layer, and wrapping the side wall and the upper surface with graphite sheets.

Step 3: As shown in Figure 1, put the extrusion die, magnesium ingot (together with the graphite sheet), and the hot extrusion shaft into the extrusion barrel in sequence, compact and ensure that the bottom surface of the extrusion die is aligned with the bottom surface of the extrusion barrel. Then, place it on a support pad with a middle hole, put it into an electric furnace, heat it to 500-550°C and keep it warm for 30 minutes.

Step 4: Preheat the base to 200-300°C and the heat-insulating barrel to 400-450°C while the extruding cylinder is kept warm in the electric furnace.

Step 5: Take out the extruding cylinder and the supporting pad from the electric furnace, place it on the base as shown in Figure 1, put on the insulating cylinder and support the lower part with heat-resistant bricks to leave room for the wire to come out, and place the cold extruding shaft on the hot extruding shaft Align the nitrogen blower with the exit of the extrusion die.

Step 6: Squeeze with a press. Turn on nitrogen. Pressurize smoothly during extrusion, control the extrusion speed of the wire at 1-5 m/min, and maintain the temperature of the outer wall of the extrusion cylinder at 400-450°C by adjusting the insulation cylinder.

Claims (1)

1. Mg alloy wire continuous squeezing method, it is characterized in that: extrusion axis is divided into hot extrude last item and cold-extruded last item; Magnesium alloy ingot, the hot extrude last item of extrusion die, outsourcing graphite flake are put into the recipient compacting successively, then recipient is put into electric furnace together with pad and be heated to 500～550 ℃ and be incubated 30 minutes; In the time of insulation base is preheated to 200～300 ℃, heat-preservation cylinder is preheated to 400～450 ℃; Then recipient is placed on the base together with the pad taking-up, put heat-preservation cylinder, on the hot extrude last item, place the cold-extruded last item, on forcing press, push; Magnesium alloy is a semisolid during extruding, blows the extrusion die exit with nitrogen simultaneously; And control silk extruded velocity is at 1～5 meter/minute; Regulating heat-preservation cylinder makes the recipient outside wall temperature maintain 400 ℃～450 ℃.

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