JPH08141601A - Manufacture of titanium thin wire - Google Patents

Abstract

PURPOSE: To form with high efficiency a titanium wire free from a surface damage by heating a titanium wire stock, and forming the cut surface of the wire stock by groove rollers from a rolling and compressing direction. CONSTITUTION: For instance, a 4mm thickness titanium wire stock 1 is made to an almost circular 7mm diameter wire stock by heating it to approximately 650 deg.C while it is passed through a heating furnace 4, and by pressing and forming it with a first groove roller 5 from a direction perpendicular to a thickness end face. Successively, it is passed through second, third and fourth groove rollers 7, 8 and 9, and then while it is passed through several sets of groove rollers connected tandem (12 sets in series), its diameter becomes 2.5mm. In this case, the temperature of the last thin wire is approximately 100 deg.C. When the skin pass of the thin wire is performed by the lamination device of the groove roller, fine rugged parts on the surface of the thin wire are corrected, and the thin wire with a smooth surface and gloss is obtained.

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 titanium fine wire, which is intended to form a titanium fine wire having no surface damage with high efficiency.

[0002]

[Technical Techniques] A technique of roller-forming a rectangular cross-section material obtained by cutting a conventional titanium thin plate into a predetermined width has been proposed (Japanese Patent Publication No. 1-26763).

The applicant of the present invention has previously proposed a technique for rolling and molding a rectangular cross-section material obtained by cutting a titanium thin plate into a predetermined width with a groove roller (Japanese Patent Application No. 6-2840).

A wide titanium coil obtained by forming a thin plate of secondary titanium by rolling is cut in the longitudinal direction,
The titanium fine wire is processed by the groove roller molding method or the hole die molding method.

[0005]

When performing fine wire processing from a material having a rectangular cross section in the prior art described above, for example, the influence of the corners of the square remains until it becomes a fine line (a minute concave line and a smooth linear strain. The surface shape or strain distribution in the cross section of the fine wire may have minute unevenness, which may cause an unexpected accident such as corrosion, breakage or breakage during use of the fine wire as various products.

The titanium thin wire produced as described above has
It has been reported that a so-called surface defect in which scratches are often left on the surface and an internal defect in which scratches are left inside cause damage / corrosion, which causes a problem in life during actual use.

During the titanium forming (plastic flow) caused by the ordinary temperature working method in the conventional method, the portion which comes into pressure contact with titanium in the groove roller method or the hole die method has an abnormal slip difference with respect to the inside of other titanium. (Deformation movement) is large. Therefore, the titanium thin plate obtained by the rolling method and the titanium thin plate cut in the longitudinal direction before the so-called wire rod forming are completely different from the titanium internal property, that is, the internal strain distribution, which is suitable for the fine wire shape. There was a problem.

[0008]

Means for Solving the Problems The above-mentioned problems have been solved by heating at least a band-shaped material obtained by cutting a titanium thin plate to a temperature at which it is easily plastically deformed and rolling it warm with a groove roller.

It is necessary to improve the strain distribution inherent to the titanium thin plate to a strain distribution suitable for the wire rod.

In the improvement, it is necessary to always form the cut surface in the direction of rolling pressure contact (compression) during the first pass of warm rolling. This is to make the distribution of the internal strain equalized to the wire rod by the plastic flow rising from the inside of titanium. In the conventional cold forming, it is a characteristic of titanium that the plastic flow from the inside of titanium has a very small rising rate as described with reference to FIG. Therefore, this is a cause that it becomes difficult that the internal strain suitable for the wire material is not evenly distributed because the flow of titanium surface on the surface of the titanium is extremely large during cold forming.

That is, according to the present invention, a titanium wire material having a rectangular cross section obtained by cutting a rolled titanium thin plate in the longitudinal direction is heated to a temperature at which it is easily plastically deformed, and a cutting surface of the wire material is cut by a groove roller. Is a method for producing a titanium fine wire, which is characterized in that it is formed from the direction of rolling and compression. Still another aspect of the invention is that a titanium wire material having a rectangular cross-section obtained by cutting a rolled titanium thin plate in the longitudinal direction is heated to a temperature at which it is easily plastically deformed, and the cut surface of the wire material is grooved from the direction in which it is compressed by rolling. A method for producing a titanium fine wire, characterized in that the strain distribution of a section peculiar to the rolled titanium thin plate is improved to a strain distribution suitable for a wire rod to be formed by forming by a roller.

Another aspect of the present invention is that a titanium wire material having a rectangular cross-section obtained by cutting a rolled titanium thin plate in the longitudinal direction is heated to a temperature at which it is easily plastically deformed, and a cutting surface of the wire material is cut by a groove roller. In the method of forming from the direction of rolling compression, the ratio of width and thickness of the rectangular cross section is 1: 1.5 to 1:
3 is a method for manufacturing a titanium thin wire. The present invention can be applied to the processing of wire materials other than a rectangular cross section, for example, a titanium wire material is
Titanium characterized in that it is heated to a temperature at which it is easily plastically deformed, and is roll-formed by a groove roller forming to a cross-sectional area of a fraction or less, and then a fine wire having a predetermined cross-sectional shape is formed by groove roller forming. A method of manufacturing a thin titanium wire, characterized in that a thin wire formed into a predetermined cross-sectional shape is pressure-molded by a laminated groove roller in which the angle of adjacent groove rollers is shifted by a small angle to give gloss. Is.

The wire material (for example, diameter 7 mm) is initially 700
Although it is heated to ℃ to 600 ℃, as the pressure molding by the groove roller progresses, the temperature gradually decreases, and becomes a low temperature of about 150 ℃ in the case of the final thin wire (for example, diameter 2.5 mm). Since this is continuous pressure molding, plastic deformation is easy even at such a low temperature, but if there is a high anisotropy in the case of a titanium thin plate, brittleness is exhibited at around 200 ° C., so there is a problem in molding ( It may cause cracks. However, if the material is heated to around 650 ° C. and is rolled by a groove roller in a warm direction from the direction of the cut surface, the anisotropy is reduced, so that brittleness around 200 ° C. does not occur when continuous rolling is performed thereafter. And safe work begins.

Therefore, the initial heating temperature also depends on the material of the wire material (amount of other metal added to titanium), cross-sectional shape, cross-sectional area and the like. Further, the degree of temperature decrease differs depending on the processing speed, the processing frequency, and the like. For example, when a wire material having a diameter of 7 mm is heated to 650 ° C. and pressure-molded with a groove roller of 12 sets to a diameter of 2.5 mm, the final fine wire temperature is 150.
Even if the temperature reaches ℃, the initial heating temperature and the final temperature may differ between pure titanium and titanium alloy, and the number of groove roller sets required for final pressure molding may also differ. The speed is also different. Therefore, based on the basic technology shown in this invention, the final thin wire can be made highly efficient by selecting appropriate conditions such as pure titanium or alloy, cross-sectional shape of wire material, cross-sectional area, thin wire diameter, etc. Can be pressure molded.

The titanium wire material in the present invention refers to pure titanium metal and titanium alloy. Therefore, JIS No. 1
Species, second type, third type, α alloy, α-β alloy, β alloy.

The temperature at which the plastic deformation is likely to occur is 700.degree.
At 150 ° C, an appropriate temperature is selected and used to facilitate the flow of material during pressure molding depending on the cross-sectional area and cross-sectional shape of the wire material.

Strain and other irregular portions may remain on the surface of the processed titanium thin wire, but these are extremely thin and can be easily removed by surface polishing.

In the processing of the present invention, the wire material is heated and pressure-molded by the groove roller. For example, the wire material 1 having a rectangular cross section in FIG. 2 has an upper surface (a) and a lower surface (b) which are surfaces that have been rolled many times by a rolling flat roller during thin plate forming, and the strain for each rolling pass is Built-in. In the present invention, in order to make this wire material have a plastic flow conforming to a circular cross section (round wire), in FIG.
Groove roller rolling is performed from the direction (d) as shown by the arrow, and the strain inside the titanium is raised up and down as shown by arrows 2 and 2 in the cross section. As a result, the strain peculiar to the rolled thin plate (titanium thin plate) can be made uniform strain corresponding to the round line cross section. Even in such a case, when it is over-reduced by the groove rollers, it becomes vertically convex shapes 1a and 1a as shown in FIG. In addition, if the groove roller causes insufficient reduction,
As shown in (c), the plane Δb remains above and below. In any case, as shown in FIGS. 2 (b) and 2 (c), the material moves outward as indicated by arrows 2 and 2, and the middle height Δh in FIG. 2 (b) or (c). The mid-plane Δb has a characteristic that it is gradually miniaturized in the process of thinning.

On the other hand, when cold forming is performed with a groove roller or a hole die, the concave portion 1c formed in the forming process as shown in FIG. 3 is caused by the surface of the wire material flowing as shown by arrows 3 and 3. Therefore, the miniaturization rate is small in the process of thinning and remains relatively deep. That is, the portion of the titanium wire material 1 near the surface of the groove roller 5 that comes into contact with the groove 5a flows toward the side of the groove roller 5 that does not come into contact with the groove 5a, so that the concave portion 1c is inevitably formed. ,
1c is molded. As a result of the movement of the surface side of the wire material 1 in this way, even if it becomes a thin wire, the recess 1c remains deeper than in the temperature rolling. This is line material 1
Because the plastic flow due to the swelling from the center of the is extremely weak. Therefore, when "skinning" is performed to remove this, the depth of the recess 1c is cut in order to make it so that it does not appear in the outer shape, so it must be ground to a depth of 200μ to 500μ. I have to.

In the case of warm working as described above, the height Δ of the surface of the fine material is increased because the flow of material during pressure molding becomes easy.
The h or the plane portion Δb becomes smaller and smaller in the process of thinning and becomes almost invisible in the thin wire product. Therefore, the "peeling" that occurs during normal temperature processing is unnecessary. If necessary, surface polishing (depth 20 μm to 50 μm) can be performed to obtain a wire material with a high-quality surface to be obtained.

Next, according to FIG. 3, it is clear that although the concave portion 1c is formed, the concave portion is hard to appear at the center portion of the groove roller pressure contact. Utilizing the fact that the thin titanium wire has a characteristic that plastic flow easily occurs in the skin portion, and as shown in FIG.
As in (b), (c), and (d), for example, when the axial center of the adjacent groove roller is changed by 45 degrees and a skin pass is performed (or when this unit is further polymerized, a pressure of about 1 μm per unit is obtained). The movement of the skin part of the thin wire is equalized, and the fine scratches on the surface will disappear, and a thin wire with Mitsuzawa will appear. When the surface is slippery and has light spots like this, there is little change even when it is left in the air, there is no change over time due to fate or weak acidity, and a highly accurate perfect circle (within ± 10μ) A titanium thin wire having

In the heat treatment of the fine wire, a processing history remains, which may cause a problem when it becomes a product. However, according to the present invention, such a problem does not occur. This indicates that the minute surface defects were filled with the plastic flow.

In the above, a relatively soft Mitsuzawa titanium fine wire can be obtained by skin-passing with a plurality of groove rollers for forming Mitsuzawa rolling into a fine wire which has been softened by heat treatment and then is subjected to pickling treatment.

[0024]

According to the present invention, the titanium wire material is heated to a temperature near the temperature at which it is easily plastically deformed, and groove roller molding is performed.
A line cross section of a predetermined area can be formed. Then, even in the case of forming with a groove roller, since the surface property of the intermediate wire is good, the final fine wire can be finished to a good surface.

Further, after the predetermined fine line is formed, if the skin is passed several times, fine irregularities on the surface of the fine line disappear and the Mitsuzawa fine line can be obtained. Such a Mitsuzawa thin wire is resistant to oxidation and other changes even when left in the air, and a stable thin wire can be provided.

[0026]

Embodiments of the present invention will be described. Width 10
While the titanium wire material 1 having a thickness of 4 mm and a thickness of 4 mm passes through the heating furnace 4, it is heated to 650 ° C., pressure-molded by a first groove roller 5 from a direction perpendicular to the thickness end face, and a diameter of 7 mm is applied. The diameter of the wire is 2.5 mm while passing through the groove rollers connected to the second, third and fourth groove rollers 7, 8 and 9 in several set tandems (12 sets in series). The temperature of the final thin wire in this case was about 100 ° C. In the figure, 6 is a guide groove roller.

If the fine wire is skin-passed by a groove roller laminating device (for example, 16 sets or 32 sets), fine fine irregularities on the surface of the fine line are corrected to form a fine line having an extremely smooth surface and a bright surface.

This fine wire is an excellent product which is relatively soft and has a light level.

For example, as shown in FIG. 4, a group of groove rollers 10,
If 11, 12, and 13 are sequentially shifted and fixed at 45 degrees, and they are set to 1 set, if 4 skins (that is, 16 sets of groove rollers) are passed through and skin pass is performed, titanium with light is obtained. Fine lines can be obtained. As for the above, 16 sets may be provided in two places (that is, 32 sets) if necessary.

[0030]

According to the present invention, since the titanium wire material is heated when it is formed by the groove roller, the flow of the material at the time of forming is extremely good, and the fine wire having no surface irregularities (or flat surface). Can be efficiently molded.

Strain is unevenly distributed on the surface of the following titanium thin wires,
Since the uneven strips are likely to remain, an unexpected accident may occur after the product is made, but the method of the present invention has an effect of eliminating such an accident. In addition, polishing the surface of the thin wire or imparting a smooth light path by a skin pass has an effect of providing a titanium thin wire having good stability against oxidation and the like.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an apparatus for carrying out the present invention.

FIG. 2 (a) is a diagram showing a material flow when forming a wire having a rectangular cross section into a round wire having a circular cross section, and FIG. 2 (b) is a view showing a material flow at the time of overpressurization molding by a groove roller. The figure which shows, (c) is a figure which similarly shows the flow of the material at the time of underpressure molding by a groove roller.

FIG. 3 is a diagram showing a flow of materials at room temperature pressure molding by a conventional groove roller.

4A to 4D are views showing an example of changes in the installation angle of each groove roller in the skin path of the present invention.

[Explanation of symbols]

 1 Wire material 4 Heating furnace 5, 6, 7, 8, 9 Groove roller

Claims (6)

[Claims] 1. A titanium wire material having a rectangular cross-section, which is obtained by cutting a rolled titanium thin plate in the longitudinal direction, is heated to a temperature at which it is easily plastically deformed, and a cutting surface of the wire material is rolled and compressed by a groove roller. A method for manufacturing a titanium thin wire, which comprises molding from a direction in which 2. A direction in which a titanium wire material having a rectangular cross-section obtained by cutting a rolled titanium thin plate in the longitudinal direction is heated to a temperature at which it is easily plastically deformed, and a cutting surface of the wire material is rolled and compressed by a groove roller. A method for producing a titanium fine wire, characterized in that the strain distribution of the section peculiar to the rolled titanium thin plate is improved to a strain distribution suitable for the wire rod to be molded by molding from. 3. A direction in which a titanium wire material having a rectangular cross-sectional shape obtained by cutting a rolled titanium thin plate in the longitudinal direction is heated to a temperature at which it is easily plastically deformed, and a cutting surface of the wire material is rolled and compressed by a groove roller. In the method for producing titanium fine wire, the ratio of width and thickness of the rectangular cross section is 1: 1.5 to 1: 3. 4. A titanium wire material is heated to a temperature at which it is easily plastically deformed, and is roll-formed into a cross-sectional area of a fraction or less by groove roller forming, and then a predetermined cross-sectional shape is formed by groove roller forming. 1. A method for producing a titanium thin wire, which comprises forming the thin wire. 5. The temperature at which plastic deformation easily occurs is 700 ° C. to 150 ° C.
The method for producing a titanium thin wire according to claim 1 or 2, wherein the temperature is set to ℃. 6. The thin wire formed into a predetermined cross-sectional shape is pressure-formed by a laminated groove roller in which the angle of the adjacent groove rollers is shifted by a small angle to impart gloss to the thin wire. Method for manufacturing titanium thin wire.