JPH06198490A - Production of additive cored wire - Google Patents

Abstract

PURPOSE:To produce the additive cored seamless wire filled with soft metals, such as mischmetal and lead, by supplying and filling granular metallic materials into wound pipe stock from its one end while under application of vibrations to the pipe stock and diametrally reducing the filled pipe stock down to a product diameter. CONSTITUTION:The roll R of the steel pipe P is fixed to a vibration table 1. This vibration table is provided with a pair of vibration motors 2, 2' and is mounted to a stand 4 via a spring 3. The metallic additive (mischmetal) to be filled in the pipe is put into a hopper 5 and is introduced through an electromagnetic feeder 6 and a hopper 7 into the beginning end 8 of the pipe. As a result, the roll R of the pipe is swiveled and vibrated around its axis C and the filling material is rapidly fed into the pipe. Two kinds of the steel pipes filled with the granular substance of the mischmetal in such a manner are respectively drawn by dies to 5.0mm outside diameter by which the pipes are finished to the products.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a long metal tube supplied in a rolled state and filled with a metal additive. It is used as an injection wire for inserting, etc., an electrode in welding, a filler rod, and the like.

[0002]

2. Description of the Related Art As a method of adding a metal additive to steel or the like in a ladle, a so-called injection wire in which an additive powder is contained in a metal coating is used. This may oxidize on the surface of the metal bath, evaporate markedly with a low melting point metal, react with the slag floating on the surface, or have a very small specific gravity and may float before melting in the bath. It is an effective method for things that have. For example, addition of Ca to steel achieves a large improvement in yield as compared with the method of adding a lump by this method.

As a method for producing such an additive-containing wire, a strip-shaped metal plate to be an outer cover is prepared,
It is general that the powdery or linear additive is wrapped in a band-shaped metal plate and wound in a cylindrical shape to be finished into a linear shape. However, the additive-containing wire produced by this method has a seam for overlapping or folding the original strip-shaped metal plate, and since it absorbs moisture from this part, it is difficult to store. Also, there is no problem when adding to molten metal in a large ladle, but when accuracy of the target position is required, such as when adding in the mold during continuous casting, the wire cross section is uneven and Therefore, the wire sent out may meander and become a problem. Furthermore, depending on the purpose, there are cases in which it is desired that the jacket be melted to the desired depth of the molten metal, but the thickness of the jacket cannot be made so large in the manufacturing process that the requirements cannot be met. There is.

In view of such circumstances, the inventors of the present invention introduced the powder of the additive from one end of the long metal tube which had been previously wound while applying vibration, filled the powder, and pulled it out to obtain a desired diameter. We have developed a technique to apply the method to the injection wire. The additive-containing wire produced by this method has a seamless pipe, so that the contents do not absorb moisture or oxidize during storage, and the bending rigidity is uniform in all directions. In addition, the wall thickness of the pipe can be changed over a wide range in terms of manufacturing.

[0005]

By the way, in the above method, the additive to be filled in the metal tube must be in the form of powder. This is because it is possible to fill the inside of the tube by vibration only when it is a powder. However, some metals are difficult to make into powder. A well-known substance is lead, which is soft and viscous, so it is extremely difficult to make it into a powder by a method such as crushing.
A powder is required for the production of a storage battery, but antimony and calcium are added as an alloying agent to increase hardness and enable crushing. Lead is added to steel as a component of free-cutting steel and may be the subject of manufacturing wires with additives, but it is a mixture of rare earth elements such as lanthanum and cerium as a material with similar problems. There is a misch metal. Although misch metal is widely used as an additive for steel and cast iron, it is often active and is often used as a wire filled in a steel pipe. A method of adding some alloying agent to harden it to make it into a powder can be considered, but it is not possible to make a material to which an alloying agent is added just to make a powder. It is economical, and in some cases, the adverse effect on the material properties due to the added components can be considered.

[0006]

The present invention is to solve the above problems and provides a method for producing an additive-containing wire in which a metal additive is filled in a wound metal tube, After the metal material to be filled is made into a linear body, it is cut into granules, and while vibrating the wound core tube, the granular metal material is supplied from one end of the core tube and filled. The method for producing an additive-containing wire is characterized in that the filled raw tube is reduced in diameter to obtain a product diameter. The metal material to be filled here is also characterized in that it is extruded from a molten state into a linear body.

[0007]

In the present invention, the metallic material to be filled is made into a linear body and then cut into granules, which are used as a raw material to be filled in a raw pipe by vibration. In the case of the lead storage battery described above, a fine powder is required to some extent, but the present invention was completed by finding that it can be used even if it is not so fine for charging by vibration into a tube. It is a thing. In other words, it is conventionally said that the diameter of the pipe should be less than 1/10 of the inner diameter of the pipe in order to be loaded into the pipe by vibration. Will be necessary. It is difficult in manufacturing to cut the small particles up to this point from the line, and even if it is possible, the efficiency becomes poor. However, for example, when the inner diameter of the pipe is 6 mm, a 1.8 mm thick wire cut into 1 mm (1.7 mm in spherical equivalent diameter) can be inserted into the pipe by vibration, and then pulled out. It has been found by experiments that no particular problem occurs when the diameter is reduced to a predetermined value. This is because the grains obtained by cutting the wire have the same grain size, and since there are no protrusions or angular burrs, the stone wall-like clogging phenomenon does not easily occur, and the fluidity as a powder is excellent, so even with such relatively large grains. It is thought that it can be used.

With respect to the above-described wire manufacturing method, in the case of soft metals such as lead and misch metal, which are the objects of the present invention, it is impossible to draw a wire with a die, which is the most common wire manufacturing method because of insufficient strength. For this reason, the method of forming a wire was examined, but it was found that the method of extruding molten metal from a porous die to form a wire is the most suitable. Since the soft metal to be used as an additive in the present invention generally has a low melting point temperature, it is suitable for being extruded from a molten state into a linear shape.

[0009] The metal of the additive thus granulated, while vibrating the element pipe having a diameter larger than that of the final product wound by the method disclosed in JP-A-59-35898,
Supply from one end and fill. Since the granules produced by the method according to the present invention have uniform granules, segregation does not occur due to vibration, the filling speed is increased, and the granules can be fed into the pipe with high efficiency. The raw tube filled with the additive by the above method is drawn by roller rolling or a die to reduce its diameter to a desired diameter. This also eliminates voids to increase the packing density of the packing material and prevents the contents from falling out of the cut end.

The additive-containing wire produced in this manner has no seam, that is, no joint in the lengthwise direction of the tube, and therefore has no hygroscopicity and is filled with an active metal such as misch metal without special packaging. Will never be altered. Moreover, a thick-walled tube can be used as the tube, and there is no limitation on the thickness of the jacket as in the method of filling the powder while bending the metal strip into a tube. Therefore, it is possible to manufacture a wire that melts at a desired depth in the molten metal bath. Further, since it has no joint, it can be drawn in a wide range of conditions without bursting when it is passed through a drawing die, so that it is possible to meet a wide range of requirements such as wire diameter, wall thickness and filling rate. Also, since the bending rigidity of the wire is the same in all directions due to the absence of joints, it is particularly suitable for applications where accuracy of the target position is required, such as when bending additives and charging additives into the mold during continuous casting. .

[0011]

Example: Melting a misch metal (melting point: about 680
℃), the diameter of which is 1.8 by extrusion with a porous die.
mm wire. Further, this was cut into particles having a length of about 1 mm. Granules of this misch metal have an outer diameter of 8.0 mm, a steel pipe with a wall thickness of 0.6 mm and an outer diameter of 8 mm,
A steel pipe having a wall thickness of 0.3 mm was wound around about 500 m and was charged from one end while applying vibration.

FIG. 1 shows an apparatus used in this embodiment, in which a wound body R of a steel pipe P is fixed to a vibration table 1. The vibration table has a pair of vibration motors 2,
2'is provided and is attached to the mount 4 via the spring 3. The metal additive to be filled in the pipe is put in the hopper 5, the electromagnetic feeder 6 and the hopper 7.
Is introduced into the pipe starting end 8. Note that 10 is a pipe end and 9 is an air vent. As a result, the winding body R of the pipe
The whirl vibration about the axis C allows the filler to be quickly fed into the pipe.

The two types of steel pipes filled with the misch metal granules as described above were each drawn with a die to an outer diameter of 5.0 mm, and finished into a product. As a result of polishing and observing the cross section, the misch metal inside each wire was an integral metal and no void was found. The original steel pipe with a wall thickness of 0.6 mm has a product outer wall thickness of 0.61 mm, and the product with a 0.3 mm wall has a wall thickness of 0.35 mm.
Met.

[0014]

According to the present invention, it is possible to manufacture a seamless additive-containing wire filled with a soft metal such as mesh metal or lead, which has been difficult to manufacture in the past. As a result, the present invention can be applied to various purposes such as when an additive is put in a ladle or a continuous casting mold, an electrode for welding and a filler rod.

[Brief description of drawings]

FIG. 1 shows an example of an apparatus for carrying out the method of the invention.

[Explanation of symbols]

 1 Vibration Table 2, 2'Vibration Motor 3 Spring 6 Electromagnetic Feeder 8 Pipe Start End 9 Air Vent 10 Pipe End P Steel Pipe R Winding Body

Claims (2)

[Claims] 1. A method for producing an additive-containing wire in which a wound metal tube is filled with a metal additive, wherein a metal material to be filled is made into a linear body and then cut into pieces. Granular, while supplying vibration to the wound raw tube, supply and fill the metal material in the granular form from one end of the raw tube,
A method for producing an additive-containing wire, characterized in that the filled raw tube is reduced in diameter to obtain a product diameter. 2. The method for producing an additive-containing wire according to claim 1, wherein the metallic material to be filled is made into a linear body by extruding from a molten state.