JPH01241302A - Manufacture of titanium wire for electrode - Google Patents

Abstract

PURPOSE:To improve the product quality and reduce the cost by forming titanium or a titanium alloy stock into a round wire stock by hot rolling and drawing work and then finishing a section of the stock into a rectangular or a special form section by roll working. CONSTITUTION:A pure titanium or titanium alloy stock is formed into a round wire stock by hot rolling and is drawn, then the stock is finished into a product having a required sectional shape by use of one or more flat roll or grooved roll mills. Thus, shape working stages for a final sectional shape such as slitting, shearing, or machining are eliminated; further, generation of shredding remains and shavings is completely eliminated. The quality of titanium wire products for electrodes is improved because the wire surface is smoothly and uniformly finished in the roll working stage. The yield is improved by eliminating generation of scraps and the manufacturing cost is reduced by the yield improvement coupled with simplifying working stages.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a titanium wire for an electrode for electrolysis used in a sodium hydroxide (NaOH) purification process.

The term titanium wire referred to below is a concept that includes wires manufactured from titanium alloys as well as industrially pure titanium.

[Conventional technology]

Titanium electrodes (anodes) are used in the electrolysis performed in the sodium hydroxide purification process.

Conventionally, when this electrode has a rectangular cross-sectional shape, it has been manufactured by slitting or jarring a wide titanium plate or titanium strip to the desired width, straightening the bend, and cutting it to a specified length6. When the shape is irregular, a method has been used in which a wire having a round cross section is cut into a predetermined cross-sectional shape.

[The problem that the invention attempts to solve]

In this way, the method for manufacturing electrode wires made of titanium or titanium alloy requires cutting a plate or strip material into thin strips or cutting a wire material with a round cross section into an irregular cross-sectional shape. In order to remove the bending in the longitudinal direction that occurs, it is necessary to perform straightening work and deburring work that occurs during shredding.

In terms of quality, there are variations in dimensional accuracy in the above-mentioned forming process, and for example, when slitting or jarring plates or strips, the surface conditions of the roll surface and the sheared surface are different, so the electrolysis rate may vary depending on the electrode location. There was a problem in that the electrode characteristics were unstable due to different characteristics.

An object of the present invention is to provide a method for producing a quality-stable titanium wire for electrodes at low cost.

[Means to solve the problem]

The present invention involves hot rolling industrially pure titanium or titanium alloy into a round wire rod, drawing the wire rod, and then shaping the cross-sectional shape of the wire rod using at least one flat roll and one or more side rolls or grooved rolls. This is a method for manufacturing a titanium wire for electrodes, which is characterized by finishing it into a rectangular or irregular shape.

Specifically, a wire rod with a round cross section is formed by hot rolling, and then drawn with a round die to a size commensurate with the cross-sectional area of the final product, and then flattened and drawn using one or more smooth rolls. This is a manufacturing method in which the cross-sectional shape of the final product is finished by applying strong pressure from the side or rolling using grooved rolls.

According to the manufacturing method of the present invention, the forming process of the final cross-sectional shape, such as slitting, jarring, or cutting, which is a conventional manufacturing method, can be omitted, and there is no generation of shredded surplus material or shavings, making it economical and Since it has excellent dimensional accuracy and a smooth and uniform surface condition, a titanium wire for electrodes with stable electrode characteristics can be obtained.

〔Example〕

Example I Industrial pure titanium equivalent to ASTM Grade 2 6.5
After hot rolling to a diameter of mφ, annealing, and removal of the oxide film, it was cold drawn to a diameter of 5.5 mφ. After that, the cross-sectional shape is 2 mm by passing the flat and side rolls alternately.
After finishing the wire rod of X8an, it was cut into a length of 1000 mm.

The surface roughness of the outer circumferential surface of the wire rod having a rectangular cross section obtained by the above manufacturing method was measured.
A comparison is shown in FIG. 1 with the same cross-sectional material obtained by shear cutting a titanium plate of 10100 mm and 1000 mm.

FIGS. 1(a) and 1(b) show the surface roughness in the longitudinal direction of a rectangular wire obtained by the method of the present invention. Figure 1 (a), (b)
) Both the edge surface and the edge surface show approximately the same roughness, and both are good. Figures 1(C) and 1(d) show rectangular wire rods made from plate materials by jarring, and there is a significant difference in roughness between the rolled surface and the sheared surface, and there are also residual cracks due to cutting.

In addition, regarding the dimensional accuracy of the thickness, the variation according to the method of the present invention is 1.972.03 mm, whereas the variation when cutting the plate material is 1.90 to 2.05 m, which indicates that the method of the present invention is superior. I understand.

Example 2 After annealing the hot-rolled material of 6.5 ornamental diameter used in Example 1, the oxide film was removed and the material was cold drawn to 3.8 mm.
I made it mφ. After that, after passing through a plurality of coarse hole type rolls, the finishing hole type roll as shown in Fig. 2(f) is passed through the same figure (e).
) is inscribed in an isosceles triangle with a base of 2.2 m and a height of 4.0 m, and each corner is an upper apex corner R = 0.5 ± Q
, 05nu, and a modified wire rod having a cross-sectional shape connected by each R of 0.3 m or less at the bottom corner R was finished. The product finished by this method has a good shape and surface roughness and is satisfactory as an electrode.

It goes without saying that the titanium wire used for this purpose is not only industrially pure titanium wire, but also the manufacturing method of the present invention can be applied to titanium alloys used for the purpose of increasing strength and corrosion resistance. .

〔Effect of the invention〕

The present invention makes it possible to omit the shredding and cutting steps that were indispensable in manufacturing titanium electrodes for electrolysis used in the conventional sodium hydroxide purification process. In terms of quality, it is possible to manufacture titanium electrodes with smooth and uniform surfaces and excellent dimensional accuracy.

[Brief Description of the Drawings] Figures 1 (a) and 1 (b) are diagrams of the surface roughness of a wire rod with a rectangular cross section obtained by the method of the present invention, and Figures 1 (C) and (d
) is a diagram of the surface roughness of a wire rod with a rectangular cross section obtained by jarring a plate, and FIG. 2(e) is a diagram of a cut surface of a deformed wire rod.
Figure (f) shows a diagram of the grooved roll. r',

Claims (1)

[Claims] 1 Industrially pure titanium or titanium alloy is hot-rolled into a round wire rod, which is then drawn, and then the cross-sectional shape of the wire rod is made into a rectangular or irregular shape using at least one flat roll and one or more side rolls or slotted rolls. A method for manufacturing a titanium wire for electrodes, characterized by finishing the titanium wire.