JPH0755356B2 - Metal long body extrusion molding method and apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously producing a metal elongated body by utilizing a discharge force of an electromagnetic pump and an apparatus for carrying out the method. More specifically, molten metal mainly composed of raw materials such as aluminum is discharged directly from the bath using an electromagnetic pump, and the molten metal is cooled and solidified while squeezing the diameter with a taper tube, And a device for carrying out the method for continuously extruding a long metal body from a nozzle tube at the tip of the.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for producing a long metal body, a molten metal is billeted and the billeted material is passed through a die to complete a long member having a necessary thickness. Devices are common. Further, as a method of directly pressing a molten metal into a die while solidifying the molten metal and extruding the molten metal, there is, for example, Japanese Patent Laid-Open No.
There is a 2-179808 publication. In this technology, molten metal is supplied into a container, and the stem is used to pressurize the molten metal in the container to push out the solidified metal from the die. The scale is extruded and molded.

[0003]

However, the former metal elongated body forming means has a limit in the forming ability of a die for narrowing a billet from a metal elongated body having a small diameter to some extent. Considering this, several steps must be prepared, and the elongated metal body must be formed while controlling them so that they operate in coordination with each other. Further, since the length of the metal elongated body to be formed is determined by the size of the billet prepared as a raw material, it was not possible to continuously produce the elongated metal elongated body.

In the latter metal elongated body forming means, the length of extruding the wire at a time is determined by the amount of molten metal supplied into the container, and the metal elongated body which has once passed through the die is next The molten metal is supplied into the container and stopped until the stem operates. In such an apparatus, since the supply and stop control of the molten metal to be supplied into the container handle the molten metal having a high temperature, it is unavoidable that the failure frequency of the portion becomes high. Further, since extrusion is performed using a pressure piston called a stem, it is necessary to devise a means for preventing molten metal from leaking between the container and the stem. Further, since the elongated metal body is not extruded continuously due to extrusion molding by reciprocating the stem, there is a drawback that workability in the winding or molding process in the next step, and further the plating step is deteriorated.

The present invention solves the above-mentioned conventional drawbacks by continuously extruding a long metal body from a metal material in a molten state and molding a billet or the like to obtain a molten metal having a required length. An object of the present invention is to provide a metal elongated body extrusion molding method capable of continuously molding a wire and an apparatus for carrying out the method.

[0006]

That is, according to the present invention,
In order to achieve the above object, the discharge port of an electromagnetic pump for discharging molten metal from a molten metal tank is connected to the base end side of a tapered pipe whose diameter gradually decreases toward the tip, A small-diameter nozzle tube is connected to the tip side, and a cooler and a heater are provided on the outer circumference of the taper tube and the nozzle tube, respectively, and while controlling the temperature of the taper tube and the nozzle tube, the hot water tank is operated by the electromagnetic pump. The molten metal is discharged from the nozzle, the molten metal is gradually cooled by a tapered tube until it becomes a semi-solidified state, and the molten metal is further cooled by the nozzle tube until it becomes a solidified state and extruded. The present invention provides a method for extruding a long metal body, which comprises extruding.

Further, a hot water tank for storing the molten metal, an electromagnetic pump for sucking the molten metal and discharging it with pressure,
A proximal end is connected to the discharge port of the electromagnetic pump, and has a tapered inner peripheral surface whose diameter gradually decreases toward the distal end, and the same distal end connected to the small diameter distal end of the tapered pipe. The present invention provides a metal elongated body extrusion molding apparatus, comprising: a nozzle tube having substantially the same inner diameter; and a taper tube and a cooler and a heater which are provided on the outer circumference of the nozzle tube and which control the temperature inside thereof.

[0008]

According to the method for extrusion-molding a long metal body according to the present invention, a long metal body having a required length can be continuously manufactured from a required amount of raw materials. That is,
When molten metal, which is the raw material for a long metal body, is put in a hot water tank and pumped up by an electromagnetic pump and discharged to the taper pipe side, the molten metal is gradually reduced in diameter by the taper pipe and cooled at the same time. It becomes solidified. Subsequently, the molten metal is further cooled in the nozzle and extruded from the tip thereof, so that the molten metal is extruded as a completely solid elongated metal body. In the method for forming a long metal body according to the present invention, the long metal body can be continuously extruded until the molten metal prepared in the hot water tank is exhausted. If the body is extruded, it is also possible to form a metal elongated body having an infinite length.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an overall configuration of a metal wire extrusion molding apparatus according to an embodiment of the present invention embodied as a metal wire extrusion molding apparatus, and FIG. 2 shows a main part thereof.
In FIG. 1, reference numeral 1 denotes a molten metal tank in which molten metal 2 is stored. Three
Is an electromagnetic pump, and this electromagnetic pump 3 has an electromagnetic coil around it, and the molten metal 2 is sucked and discharged into the central tube by the action of electromagnetic induction induced by the electromagnetic coil. Although description of the control circuit of the electromagnetic pump is omitted, it goes without saying that a control device for the electric power system is required to operate the electromagnetic pump.

The electromagnetic pump 3 sucks the molten metal 2 from the above-mentioned bath 1 and discharges it from a discharge port 4 provided on the upper side surface thereof. A discharge pipe 5 is connected to the discharge port 4 of the electromagnetic pump 3. This discharge pipe 5 has the above-mentioned discharge port 4,
Although it is for connecting a taper pipe 6 which will be described later, when the discharge port 4 of the electromagnetic pump 3 and the taper pipe 6 which will be described later are directly connected, the discharge pipe 5 is not necessary. Reference numeral 5a is a heat insulation heater provided on the outer circumference of the discharge pipe 5. This is provided for the purpose of keeping the temperature of the molten metal in the discharge pipe 5 so as not to drop. That is, in order to maintain the molten state of the molten metal, the discharge pipe 5 is heated to a temperature higher than its melting point by the heater 5a. For example, the diameter is 0.1 to 5.
When molding a 0 mm aluminum wire, the discharge pipe 5 is controlled to maintain about 670 ° C. Such temperature control is performed by attaching a temperature sensor (not shown) to the discharge pipe 5 and feeding back the measured value to the controller. Although the discharge pipe 5 is a straight pipe in the figure, it does not have to be a separate straight pipe, and may be, for example, a bent pipe bent at a right angle. Further, in order to properly adjust the temperature of the molten metal reaching the taper pipe 6,
A duct provided with a heat-retaining heater and a cooler may be connected between the discharge pipe 5 and the taper pipe 6.

In FIGS. 1 and 2, reference numeral 6 denotes a taper tube which is the base end side of an extrusion mold, and the taper tube 6 is formed of a heat-resistant material whose inner diameter portion becomes thinner toward the tip. It is a sex tube. Generally, a ceramic is used for the tapered tube 6, and for example, silicon nitride is suitable. A cooler 6a and a heater 6b are provided on the outer peripheral portion of the tapered tube 6. The cooler 6a is composed of a pipe that serves as a refrigerant passage, which is alternately wound around the heater 6b in the circumferential direction of the taper pipe 6 so that the temperature of the taper pipe 6 can be arbitrarily controlled. For example, when an aluminum wire is extrusion-molded by this apparatus, the taper tube 6 needs to be held at a temperature of about 650 ° C., which is slightly lower than the melting point of aluminum. Initially, the taper pipe 6 is heated to that temperature by the heater 6b, but after the extrusion molding is started, the temperature of the taper pipe 6 gradually rises due to the temperature of the molten aluminum. Always maintain the above temperature. Similar to the discharge pipe 5, such temperature control is performed by attaching a temperature sensor (not shown) to the taper pipe 7 and feeding back the measured value to the controller.

In FIGS. 1 and 2, reference numeral 7 denotes a nozzle tube on the tip side of a die for extrusion molding, and the nozzle tube 7 is made of a heat-resistant material and has an inner diameter of approximately the same length. Has been formed. The material is generally ceramics, and in particular, boron nitride is preferable from the viewpoint of wettability with a metal material to be formed into a wire. The base end of the nozzle pipe 7 is connected to the small diameter end side of the taper pipe 6 described above, and the tip end is open. Further, this nozzle tube 7 has a cooler 7a and a heater 7b through which the refrigerant passes along the outer peripheral portion thereof, like the above-mentioned taper tube 6.
Is provided. The molten metal cooled to the semi-solidified state by the taper tube 6 is cooled by the nozzle tube 7 to the solidified state. Therefore, taking the case of extruding the aluminum wire as an example, the nozzle tube 7 is maintained at a temperature of about 640 ° C., which is lower than that of the taper tube 6. Air, oil, a mixture of air and water, or the like can be used as the refrigerant. The heater 7b is mainly used for preheating the nozzle tube 7.

In FIG. 1, 8 and 8'are guide rollers.
9 is a cooling unit, 10 is a winding drum, 11 is a shaping die,
12 is a winding drum. The elongated metal body A extruded in a solidified state from the nozzle tube 7 passes through the cooling unit 9 while being guided by the guide rollers 8 and 8 ', and is cooled. The cooled metal elongated body A is once wound around the winding drum 10. After that, it is wound around the winding drum 12 through the shaping die 11. The shaping die 11 is provided as needed, and for example, a plasma processing apparatus, a surface processing apparatus, or a coating apparatus for performing plating may be provided instead of the die.

Referring to FIG. 2, the taper tube 6 and the nozzle tube 7 are shown.
To explain the structure of and more specifically,
It is connected to the discharge pipe 5 of the electromagnetic pump 3, and the outer periphery thereof is covered with the heat insulating material 20. The cooler 6a and the heater 6b are led out to the outside through the heat insulating material 20 and connected to a necessary control device. Similarly, the outer peripheral portion of the nozzle tube 7 is also covered with the heat insulating material 20 ', and the cooler 7a and the heater 7b are led out to the outside through the heat insulating material 20 and connected to a necessary control device.

Next, an embodiment of a method for extrusion-molding a metal elongated body using this metal elongated body extrusion molding apparatus will be described. The required weight of metal material calculated from the length of the elongated metal body A formed in the bath 1 is charged and melted, and the molten metal 2
Be prepared as. The sufficiently melted molten metal 2 is sucked by the electromagnetic pump 3, and is discharged from the discharge pipe 5 toward the tapered pipe 7 with a pressure applied by the electromagnetic induction action of the electromagnetic pump. Since the discharge pipe 5 is maintained at a temperature higher than the melting point of the molten metal 2, the molten metal 2 is still in a completely molten state when it is in the discharge pipe 5.

The molten metal is press-fitted from the discharge pipe 5 into the taper pipe 6 which is preheated to a predetermined temperature by the pressure applied by the electromagnetic pump 3. Since this tapered tube 6 is maintained at a temperature slightly lower than the melting point of the molten metal 2,
The molten metal 2 gradually radiates heat inside the tapered pipe 6 and gradually becomes a semi-solidified state from the outside, but is pushed out to the tip side of the tapered pipe 6 having a small inner diameter by the pressing force given by the electromagnetic pump, and is squeezed. It becomes thinner gradually. further,
Semi-solidified molten metal 2 extruded from taper tube 6
Is further cooled and solidified by the nozzle tube 7 maintained at a temperature lower than that of the taper tube 6, and is extruded into a linear shape. The inner diameter of the nozzle tube 7 is uniform, and the molten metal is not squeezed and is extruded with a constant diameter.

A metal elongated body A extruded from the nozzle tube 7.
Has a temperature of around 600 ° C., the cooling liquid is sprayed by the cooling unit 9 between the guide rollers 8 and 8 ′, and the temperature is sufficiently lowered. The metal elongated body A whose temperature has decreased is used for the winding drum 10 and the shaping die 11.
And is wound around the winding drum 12 (see FIG. 1). However, as described above, the coating process may be performed before the winding on the winding drum 12.
For example, when the elongated metal body A to be manufactured dislikes an oxide film on the surface caused by exposure to air and is manufactured in a specific atmosphere, for example, a nitrogen atmosphere, the metal length from the nozzle tube is The scale A is immediately subjected to another antioxidant treatment. The cooled metal elongated body A is continuously extruded from the tip of the nozzle tube 7 until the molten metal 2 in the hot water tank 1 is exhausted, and is wound around the winding drum 12.

In the above embodiment, the case where a metal wire having a small diameter is extruded as the elongated metal body A has been described, but if the inner diameters of the taper pipe 7 and the nozzle pipe 6 are made thicker to a certain extent, it is more effective. It is also possible to mold a long rod-shaped body having a large diameter. Furthermore, for example, by inserting a mandrel into the taper tube 7 and the nozzle tube 6, it is possible to form a hollow metal elongated body.

[0019]

INDUSTRIAL APPLICABILITY The method and apparatus for extruding a long metal body according to the present invention described above utilizes the discharge force of an electromagnetic pump to continuously form a long metal body of virtually infinite length. You can Furthermore, since it is possible to directly form a long metal body without forming a billet or the like from molten metal,
It becomes possible to efficiently manufacture a long metal body.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional side view showing the overall configuration of a metal elongated body extrusion molding apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged vertical cross-sectional side view of a main part showing a main part of the apparatus for extrusion-molding a long metal body according to the embodiment.

[Explanation of symbols]

 1 Hot Water Tank 2 Molten Metal 3 Electromagnetic Pump 5 Discharge Pipe 6 Tapered Pipe 7 Nozzle Pipe 6a, 7a Cooler 6b, 7b Heater A Metal Long Body

Claims (3)

[Claims] 1. A base end side of a taper pipe whose diameter gradually decreases toward the tip is connected to a discharge port of an electromagnetic pump for discharging the melt metal from a molten metal tank, and the tip end side of the taper pipe is connected to the taper pipe. A small-diameter nozzle pipe is connected, and a cooler and a heater are provided on the outer circumferences of the taper pipe and the nozzle pipe, respectively, and while controlling the temperature of the taper pipe and the nozzle pipe, the molten metal is melted from the molten metal tank by the electromagnetic pump. The molten metal is gradually discharged by squeezing it with a taper tube until it becomes a semi-solidified state, and then the molten metal is extruded by cooling it with a nozzle tube until it becomes a solidified state. A method for extrusion-molding a long metal body, comprising: 2. A molten metal storage bath, an electromagnetic pump that sucks the molten metal and discharges it with pressure, and a discharge port of the electromagnetic pump whose proximal end is connected and whose diameter gradually decreases toward the distal end. A taper tube having a tapered inner peripheral surface, a nozzle tube having an inner diameter substantially equal to the tip connected to the tip end of the taper tube having a small diameter, and the inside of the taper tube and the outer circumference of the nozzle tube. And a heater for controlling the temperature of the metal elongate body extrusion molding apparatus. 3. The long metal extrusion molding apparatus according to claim 2, wherein the taper tube and the nozzle tube are formed of a material containing ceramic as a main component.