JPH0737676B2 - Method for manufacturing titanium outer ring of electrodeposition drum for manufacturing electrodeposition foil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used for an electrodeposition drum for producing an electrodeposition foil, which is used for producing a metal foil such as a copper foil, an iron foil, and a stainless steel foil by an electrodeposition method. The present invention relates to a method for producing a titanium outer ring of an electrodeposition drum for producing an electrodeposition foil.

[Conventional technology]

As a conventional electrodeposition drum for producing electrodeposition foil using outer skin made of titanium and titanium alloy, Japanese Patent Publication No. Sho 58-24507.
JP-B, JP-B-61-60149, JP-B-62-233 and the like are known, but there are known documents before application regarding improvement treatment of the plate joint portion of the outer skin that is the electrodeposition surface of the electrodeposition drum. Absent.

A typical example of a general electrodeposition foil manufacturing apparatus will be described with reference to FIGS. 6 to 8. The shaft b of an electrodeposition drum a made of a titanium outer cylindrical skin whose surface is polished can be rotated by bearings c and d. Supported by a rotary drive source connected to the shaft b,
A part of the lower side of the electrodeposition drum a is immersed in the electrolytic solution f in the electrolytic bath e, an anode g is installed in the electrolytic bath e, and an electric current is applied between the electrodeposition drum a and the anode g to rotate the electrodeposition. While the drum a is immersed in the electrolytic solution, the metal foil indicated by the electrodeposit i is deposited on the outer peripheral surface of the outer skin, and the metal foil is peeled off from the outer peripheral surface of the electrodeposited drum a, and a long metal foil is formed. Is continuously produced.

[Problems to be Solved by the Invention]

Since the outer skin skin is printed as it is on the peeled outer skin side of the metal foil that is continuously produced by such an electrodeposition drum, the pattern of the connection portion of the outer skin plate joint is also transferred as it is. Will be.

As for the recent foil quality, it is required to improve the quality so that this pattern is eliminated as much as possible so that it is eliminated.

In response to this demand, efforts are being made to eliminate the pattern formed on the weld.

The production of seamless skin without welding is being carried out.

With respect to the above, it is possible to weld with a certain degree of care so that the properties of the welded portion are similar to those of the base metal, but it has not yet been solved that the pattern of the welded portion is reliably printed on the foil surface.

Regarding the above, since ring rolling has to be carried out directly from the beginning, there are drawbacks such that it is difficult to obtain a preferable quality as an outer skin material and the manufacturing cost is high.

The present invention provides a method for manufacturing a titanium outer ring for an electrodeposition drum, which solves the above problems.

[Means for Solving the Problems]

 The gist of the present invention will be described with reference to the accompanying drawings.

A method for manufacturing a titanium outer ring of an electrodeposition drum for manufacturing an electrodeposition foil, which comprises covering an inner drum with an outer skin formed by winding a plate material of titanium or a titanium alloy in a cylinder and welding both ends together. Or the titanium alloy plate material is wound into a cylinder and the outer skin with both ends welded by plate is hot or cold rolled by a ring mill, and subsequently annealed by microstructural difference improving treatment at least twice or more. In hot rolling, the work rate per operation was set to 20% or more, and in cold rolling, the work rate per operation was set to 10% or more. Manufacture of titanium outer ring for electrodeposition drum for electrodeposition foil manufacturing, characterized by approximating the transformation structure to that of the base metal and erasing the weld pattern as much as possible. It relates to the manufacturing method.

[Action]

Repeating the microstructural difference improvement treatment, which is performed by continuously performing the rolling treatment and the annealing treatment, twice or more, and the working rate per hot rolling is 20% or more, and the working rate per cold rolling is 20% or more. By setting the rate to 10% or more, the structure of the welded part which has been deteriorated into a coarse grain structure and a transformed structure by welding is approximated to the structure of the base metal again, and the pattern of the welded part is erased as much as possible.
Eliminates the phenomenon of pattern addition to electrodeposited foil.

Welding that makes the processing rate per hot-rolling process above 20% and that of cold-rolling process above 10% approximates the structure of the base metal when the processing rate is below that. The structure difference of the welded part is not sufficiently improved, and the pattern of the welded part is not sufficiently erased.

〔Example〕

The management conditions for the tissue difference improvement processing of the present invention are described in detail below.

i) In the case of hot rolling processing i) The processing rate per heating should be 20% or more.

B) The heating temperature and processing temperature of the titanium material are about 850 ° C or lower within the range allowed by the rolling ability of the ring mill, and the lower the temperature, the better.

C) The number of times of heat processing is two or more, and the higher the number of times, the better the metal structure can be obtained. Is desirable.

D) It is desirable to carry out annealing at a temperature of about 650 ° C or higher for 30 minutes or more in order to adjust the crystal grains of the material in the process before finish rolling with a ring mill.

E) Be careful that the temperature of the titanium material does not exceed the heating temperature due to heavy reduction and strong processing during ring mill rolling.

F) It is desirable to perform the final finish annealing at about 750 ° C or lower.

ii) In the case of cold rolling processing a) The processing rate per time is 10% or more, and the total processing rate is
It is desirable to secure at least 20%.

B) Finishing In order to adjust the grain size of the material in the process before cold rolling, it is desirable to carry out annealing at a temperature of about 650 ° C or higher for 30 minutes or longer.

C) It is desirable that the final finish annealing be performed at about 750 ° C or lower.

(Example 1) A pure titanium plate equivalent to JIS Class 1 with a thickness of 50 mm is rolled into an outer diameter
1020 mm, weld the butt ends with titanium and then
It is heated to 700 ℃ and subjected to ring rolling with a ring mill to first make the outer diameter 1425 mm and the wall thickness 35 mm.

Then, sized and annealed at 750 ° C for 1 hour, heated at the same heating temperature as the first time, and finished annular rolling to give an outer diameter of 2010 mm,
Roll to a wall thickness of 24.5 mm.

The total processing rate in this rolling was 51%, and it was confirmed that the titanium outer ring of the electrodeposition drum could be of a quality that was sufficiently applicable.

(Example 2) A pure titanium plate equivalent to JIS class 1 with a thickness of 10 mm is rolled to an outer diameter.
It is 1400 mm, and the butt ends are connected and spliced, and then cold rolled to give an outer diameter of 1650 mm and a wall thickness of 8.5 mm.

Next, grain size annealing is performed at 750 ° C. for 60 minutes, and then annular rolling is performed again in the cold state to roll to outer diameters of 2002 mm and 7 mm. After that, it is annealed in the range of 600 to 700 ° C to finish the titanium outer ring of the electrodeposition drum.

The total processing rate in this rolling was 30%, and since it was cold rolling, the metal structure of the weld joint changed from the cast structure to the wrought structure, and it was confirmed that a quality that could be sufficiently applied as the titanium outer ring of the electrodeposition drum could be made. Was done.

The above is shown in the process chart as follows.

The titanium outer ring manufactured in this way is shrink-fitted onto the inner drum 3 as shown in FIG.
As shown in the figure, an electrodeposition drum is formed with a structure assembled into a solid type supported by a reinforcing ring 4, and the outer surface of each is cut and polished to complete the electrodeposition drum.

Reference numeral 2'in the figure is a welding heat affected zone.

〔The invention's effect〕

The present invention is to anneal a coarse grain structure and a transformation structure as shown in the photomicrographs of FIGS. 10 and 11 which have been deteriorated by the heat effect at the time of welding the plate joint welded portion of the outer ring as described above, after the rolling treatment. By performing the microstructural difference improvement process repeatedly twice or more, and in the hot rolling process, the rate of one process is 20% or more, and the cold rolling process is 10% or more, so that the grain size is surely adjusted. The microstructure of the micrographs in Figs. 13 and 14, which are similar to the base metal by being made finer and finer, has been improved, and the surface pattern of the welded joint after finish polishing has been virtually eliminated with almost no pattern. An excellent electrodeposition drum that can be used for a long period of time to produce high-quality foil-making that does not print the pattern of the welded part, and can significantly improve the operating rate and foil yield of the foil-making equipment. The titanium outer ring can be provided.

The results of observing the titanium outer ring of the present invention with a microscope are shown in FIGS. 12, 13, and 14, and FIGS. 9, 10, and 11 are micrographs of the conventional welded portion in FIG. Compared to the base metal part in the figure, the heat affected zone in Fig. 10 and the weld part in Fig. 11 have rough skin, and have a coarse grain structure and a transformation structure.

However, the titanium outer ring of the welded portion of the present invention shown in FIG. 5 has a welding heat affected zone of FIG. 13 and a welded portion of the base metal of FIG. 14 as compared with the base metal of FIG. It was confirmed that the normal structure was improved to be almost the same as that in Fig. 12, and the traces of the plate joint welding were improved to such an extent that it was difficult to recognize even by visual observation after surface polishing.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a perspective view of a titanium outer ring formed into a cylindrical shape by plate piecing welding, and FIGS. 2 and 3 are electric wires using the titanium outer ring of the present invention. The front view which notched a part of 2 examples of wearing drums, 4th
FIG. 5 is a perspective view of a titanium welded portion of a conventional example, FIG. 5 is a perspective view of a titanium welded portion of the present invention, and FIGS. 6, 7 and 8 are explanatory views of a foil manufacturing apparatus using a conventional electrodeposition drum, 9, 10 and 11 are micrographs of the conventional welded portion of FIG. 4, and FIGS. 12, 13 and 14 are micrographs of the welded portion of FIG. 9 and 12 are comparison photographs of the base metal part 1, 10 and 1.
Fig. 3 is a comparison photograph of the weld heat affected zone 2 ', and Figs. 11 and 14 are comparison photographs of the plate joint weld zone 2.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshinada Sato No.29, Kawaramachi, Joetsu City, Niigata Prefecture Japan Stainless Steel Products Co., Ltd. (72) Kinzo Murayama No.29, Kawaramachi, Joetsu City, Niigata Prefecture Japan Stainless Steel Kozai Co., Ltd. (56) Reference JP-A-2-243790 (JP, A)

Claims (1)

[Claims] 1. A method for producing a titanium outer ring of an electrodeposition drum for producing an electrodeposition foil, comprising an inner skin and an outer skin formed by winding a plate material of titanium or a titanium alloy into a cylinder and welding both ends together. There, the outer skin with the plate material of the titanium or titanium alloy wound around a cylinder and welded at both ends is subjected to rolling treatment with a ring mill in a hot or cold manner, and then an annealing treatment is performed at least twice to improve the microstructure difference. Repeatedly, the working rate per hot rolling process is 20% or more, and the working rate per cold rolling process is 10% or more. The titanium outer of the electrodeposition drum for electrodeposition foil production, characterized in that the coarse grain structure and the transformation structure that occur are approximated to the structure of the base metal to erase the pattern of the welded part as much as possible. Ring manufacturing method.