JPS594202B2 - Golden-throated beetle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a hot extrusion method for manufacturing a wire rod containing a large number of thin metal wires for fibers by organically combining hot extrusion and hot wire rod rolling processes. This relates to a billet manufacturing method.

The present inventors have previously developed a method for manufacturing metal fibers that consists mainly of cold wire drawing, by organically combining hot extrusion and hot wire rolling. We have succeeded in developing a method for efficiently obtaining metal fibers by obtaining wire rods containing thin metal wires and using them as strands, and have already filed an application as Japanese Patent Application No. 1988-88875.

In this method, first, a billet made of fiber metal on the inside and ordinary steel on the outside is hot extruded to make a billet for wire rod, hot rolled into a wire rod, drawn and straightened, and then cut into a predetermined length. Cut into.

A large number of these wire rods are further inserted into a common steel tube to form an aggregate, and a billet for hot extrusion is again made.

This billet is hot extruded to produce a billet for wire rod rolling, and by hot rolling this billet, a wire rod containing a large number of fine fiber wires is manufactured.

Such a wire rod is then processed to the required metal fiber diameter by a known cold wire drawing process, and then only the ordinary steel is melted with nitric acid, etc., and only the fine metal wires are easily separated and left to become metal fibers. .

In this case, the ordinary steel covering the thin metal wires acts as a separator to prevent the thin metal wires from seizing together due to heating during the manufacturing process.

However, when obtaining metal fibers, the wire is rolled with thousands of thin metal wires contained in one wire, so the thin metal wires located at the center of the wire are deformed non-uniformly during the wire rolling process. If the deformation is significant, the separator may be torn and the thin metal wires may be locally welded.

The thin metal wire in this state is reduced to the required diameter in the subsequent process and dissolved and separated using a solvent to extract the metal fibers, but the metal in the center, which has been unevenly deformed, If the dissolution and separation of the fibers is delayed and the fibers are melted in a continuous line, they remain as undissolved portions, which hinders the entire melting process.

This tendency becomes more frequent as the thickness of the separator gradually decreases as the number of contained thin metal wires increases and the diameter decreases.

This has been a major obstacle to improving productivity by increasing the number of thin metal wires included in the wire.

The present invention has been made in order to eliminate such drawbacks in the conventional method when producing billets for hot extrusion using an aggregate of a large number of composite wire rods.

After the wire rod is rolled, the central part of the wire rod is filled with a minimum amount of rod-shaped melted material that is approximately the same as or slightly different from the isolating material, and the metal fiber wire rod is placed in a position that avoids the center part. urge

That is, in the central part of the wire, where undissolved parts tend to remain during melting to obtain metal fibers, the shape of the metal fibers tends to be poor, so only the material to be dissolved and removed is placed in that part.

Therefore, if this work is done during the production of billets for hot extrusion, and if a bar material intended only for melting is allocated in advance, it will absorb the uneven deformation of the center during the wire rolling process and serve as an isolation material for the surrounding thin metal wires. There is no mismatch, and both the thin metal wire and the separator undergo uniform deformation as a whole, making it possible to obtain a homogeneous metal fiber.

The metal fiber-containing wire made in this way.

During the melting process, the metal fibers in the vicinity of the center can be easily dissolved and separated without any undissolved parts, which also helps shorten the melting time.

However, if the thickness of the molten material filled in the center during hot extrusion billet production is too large, the number of thin metal wires will be reduced, and if it is too small, the filling effect will be weakened, so composite wires are used as an aggregate. The size may be appropriately selected depending on the number and diameter of the holes.

or. The shape is not limited, however.

A circle, hexagon, etc. are preferred.

Regarding the material, it is most preferable to use a material with the same or similar composition to the isolating material of the thin metal wire in order to obtain uniform metal fibers, but the material is not limited to this, and it can be melted within a range that does not adversely affect the metal fibers. It may be made of a material that is easy to use.

Example First, to make a billet for hot extrusion, the outer diameter was 2 as the outer shell material.
00rMLψ, wall thickness 15#, length 700mm ultra-low carbon (C: 0.01%, Si: 0.25%, Mn
：0.30P：o、ois、S：0.02
Section 5) Use a steel pipe with an outer diameter of 170 m with 5US316.
ψ stainless steel was inserted and hot extrusion was performed to obtain a billet of 80 mm square and 3.5 m long.

This billet was hot-rolled into a wire rod with an outer diameter of 8#ψ (the outer diameter of the stainless steel included is about 6.8 wnψ) and a length of about 42 mm.
A 0 m composite wire coil was obtained.

Next, after drawing the wire to 2.5 mψ, the wire 1, which was made into a straight line, was inserted into a separator 2 of an ordinary steel pipe with an outer diameter of 200 +++ mψ, a wall thickness of 15 rrrrn, and a length of 700 rrm, as shown in the drawing. Insert 3,200 wire rods into the center, fill the center with 22m hexagonal steel of ordinary steel as the melting material 3, make a billet for hot extrusion, perform hot extrusion, and wire rod billet of 80rML square. A wire coil was obtained.

This wire has 320 stainless steel wires with a diameter of approximately 138μ.
Ultra-low carbon steel was present as a separator around each fine stainless steel wire, and the outer layer of the wire was entirely covered with ordinary steel.

In order to obtain stainless steel fiber from this wire, the 13mψ
After drawing the wire rod to approximately 1.13 m + + + ψ through appropriate wire drawing processes, dissolve the outer shell material and isolation material with nitric acid to obtain a wire of 12 μm.
stainless steel fibers were obtained.

During the dissolution and separation of the stainless steel fibers at this time, no undissolved residual fibers were generated in the center, and the cross-sectional shape was homogeneous and very good stainless steel fibers were obtained.

In the cold processing process, that is, the process of drawing and heat-treating the metal fiber wire manufactured by the present invention to produce a specified metal fiber, there is no need to worry about the unmelted problem, so continuous melting work can be performed. This has the advantage that the working time can be reduced accordingly.

To give one example, the dissolution time for stainless steel fibers was reduced to about 1/2.

Therefore, the effect is that work efficiency is doubled and productivity (economical efficiency) is greatly increased.

[Brief explanation of the drawing]

The drawings are explanatory diagrams of embodiments of the embodiments. 1: Composite wire rod, 2: Isolation material, 3: Melting material.

Claims (1)

[Claims] 1. Metal fiber production characterized by filling the center of the billet with a melting material when producing a billet for hot extrusion using a composite wire rod whose outer layer is an isolation material and whose interior is a metal wire for fibers. Method for producing hot extrusion billets for use.