JP3151795B2 - Conical roll rolling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll rolling apparatus for rolling a work material into a tape-shaped wire by passing the work material between a pair of rotating rolls.

[0002]

2. Description of the Related Art As a device for rolling a work material such as a wire having a circular cross section or a wire having a flat cross section into a tape-shaped wire, a pair of cylindrical rolls are arranged so that their rotation axes are parallel to each other. There is a roll processing apparatus that forms a rectangular cross section by passing a wire having a circular cross section between the processing surfaces and a circular cross section from the flat cross section to a thin rectangular cross section. .

[0003] As another rolling apparatus, there is an apparatus using a method called a cross roll mill for reducing the thickness by moving a wire in a longitudinal direction while reciprocating a rolling roll in the width direction of the wire.

[0004]

In the above-described rolling apparatus in which a pair of cylindrical rolls are arranged in parallel, since the processing is performed steadily, the elongation in the longitudinal direction is large, and the tape-shaped wire rod has a large length. Tightening is difficult, and particularly in the case of a difficult-to-process material such as a metal-based superconducting wire, a crack is easily generated due to a large elongation in the longitudinal direction.

On the other hand, in a rolling apparatus using the cross roll mill method, by rolling in the width direction, the elongation in the longitudinal direction is small, and even a difficult-to-process material can be processed into a tape shape without cracking. , The equipment is complicated and expensive,
Alternatively, when the roll reciprocates, the deformation behavior is not constant in the longitudinal direction, and the tape width varies in the longitudinal direction.

[0006]

According to the present invention, in order to solve the above-mentioned problems, one of a pair of rollers is a conical roll whose processing surface is a conical shape, and the other roll is a flat surface having a flat processing surface. And a flat roll having

[0007]

The contact area between the tape-shaped wire and the roll can be increased by combining a conical roll having a conical shape and a flat roll having a flat surface. Processing with a large spread in the direction can be performed, and efficient and steady rolling processing of the tape-shaped wire can be performed.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a perspective view of a main part of a roll rolling device according to the present invention, and FIG. 2 is a front view of a main part of the roll rolling device. The roll rolling device combines a conical roll 1 and a flat roll 2. It has a pair of processing rolls. The conical roll 1 has a flat conical shape, and the flat roll 2 has a disc shape. The apex of the conical roll 1 is arranged so as to match the rotation center of the flat roll 2 with the conical peripheral surface 1a of the conical roll 1 and the flat surface 2a of the flat roll 2 as processing surfaces. In addition, the flat roll 2 may use an end face of a cylindrical roll instead of the disc roll.

In this rolling device, the work material 3 is continuously lowered by passing the work material 3 between the conical peripheral surface 1a of the conical roll 1 and the flat surface 2a of the flat roll 2. And continuously process it into a tape-shaped wire. Here, the rolling speed and rolling force of the rolling device can be arbitrarily controlled.

Next, a specific example of the rolling process will be described. Forged steel is used as a tool material, and as shown in FIG. 2, the conical roll 1 may have a vertical angle θ (90 ° <θ <180 °). ) Is 150 ° and the side length is the diameter D of the flat roll 2.
(Here, 75 mm), and the flat roll 2 has a diameter D of 150 mm and a thickness t of 30 mm.

Using this roll rolling device and a conventional rolling device in which a pair of rolls are arranged in parallel, a Tl-based silver-coated superconducting wire having a diameter of 0.662 mm and a length of 100 mm is processed into a material having a thickness of 0 mm. A tape-shaped wire rod rolled to .14 mm was manufactured, and the deformation in the thickness direction, width direction, and longitudinal direction was measured. Table 1 shows the measurement results.

[0012]

[Table 1]

As is clear from the measurement results, the elongation in the longitudinal direction is about 4% when processed by the roll rolling device according to the present invention, whereas when processed by the conventional rolling device, the elongation is about 4%. 14% elongation in the longitudinal direction
As a result, the width of the roll rolling device according to the present invention becomes larger.

At this time, the 77K. The critical current density Jc in OT was measured. Here, the critical current density Jc was measured by a DC four-terminal method, and was a value obtained by dividing the current value at the time of generating a voltage of 1 μV / cm by the cross-sectional area of the superconductor core. As a result, 15000 A / cm ² was obtained when processed by the roll rolling device according to the present invention, but only 5000 A / cm ² was obtained when processed by the conventional rolling device. As a result, the superconducting characteristics are greatly affected by the above-described widening processing, and it can be seen that the present invention is more effective than the conventional apparatus.

[0015]

As described above, according to the rolling device according to the present invention, since the work material is rolled between the conical roll and the flat roll, it is difficult to process the work material such as titanium or tungsten. Can also be rolled into a tape shape.
In particular, when processing an oxide superconducting wire, high surface pressure processing becomes possible, the grain boundary bonding of the oxide superconducting crystal is improved, and the critical current density characteristics can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a roll rolling device according to the present invention.

FIG. 2 is a front view of a main part of the apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Conical roll, 1a ... Conical peripheral surface (processed surface), 2 ... Plane roll, 2a ... Flat surface (processed surface), 3 ... Worked material.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-200473 (JP, A) JP-A-4-197542 (JP, A) JP-A-59-166336 (JP, A) JP-A-60-1985 162511 (JP, A) JP-A-61-99526 (JP, A) JP-A-1-154806 (JP, A) JP-B-45-10221 (JP, B1) (58) Fields investigated (Int. ⁷ , DB name) B21H 8/00-8/02 B21B 1/08

Claims (1)

(57) [Claims] 1. A roll rolling device for rolling a tape-shaped wire rod by passing a processing material between a pair of rotating rolls, wherein one of the pair of rollers has a conical shape with a processed surface of a conical shape. Wherein the other roll is a flat roll having a flat processing surface.