JPS5829557A - Continuous production of thin strip of amorphous metal - Google Patents

Abstract

PURPOSE:To prevent the growth of cracks and make long-time continuous operation possible by ejecting and supplying molten metal continuously onto the surface of a cylindrical cooling body under high speed revolution continuously while polishing the same continuously or intermittently. CONSTITUTION:Molten metal M in a tundish 15 is ejected and supplied to a cooling roll 10 under high speed revolution through a nozzle 21 whereby a thin strip S of amorphous metal is formed and the strip is taken up on a coiler 16. A grinding roll 18 such as a grinding wheel electrodeposited with diamond is provided spacially from said coiler 16 and in contact with the roll 10. The roll 18 is rotated continuously or intermittently in the direction opposite to the rotating direction of the roll 10, whereby the surface of the roll 10 is polished and the damaged parts produced on the surface of the roll 10 are cleaned. Thus the microcracks produced by the supply of the molten metal M are prevented from growing.

Description

[Detailed description of the invention] It is.

The twin-roll method and single-roll method using liquid quenching have been developed as methods for manufacturing amorphous metal ribbons, and attempts have been made to manufacture wires and plates.

On the other hand, there is a need for a low-cost supply of Kamekatrans material through mass production, but the liquid quenching method using the twin-roll method or single-roll method requires that the cooling roll is instantaneously exposed to molten metal. Therefore, cracks due to fatigue are inevitable. For this reason, the surface of the cooling roll is protected by surface treatment, but according to the experience of the present inventor, surface defects due to the occurrence of cracks and poor cooling may cause
Currently, production has to be interrupted every 30 minutes.

FIGS. 1 and 2 schematically show the surface properties of the cooling roll. Cracks 12 on the surface 10 of the cooling roll grow over a long period of use, and eventually the surface portion opens and melts. The metal M enters into this gap, creating a cooling failure area 11 of the molten metal, and crystallization occurs. Therefore, it causes variations in the material and breakage of the metal cold zone.

According to experiments conducted by the present inventor, it has been confirmed that this problem can be completely solved by preventing the cracks that have occurred on the surface of the cooling roll from growing completely.

One way to do this is to constantly polish the cooling roll.
The next step is to fully regenerate the newly formed surface (1.0-; I, 10-1) and completely prevent the growth of cracks.

Another method is to intermittently grind the cooling roll to regenerate the new crack-free surface of 1.0-cq. Of course, such a crack is an initial crack with a length that does not span the entire opening. The introduction of such a polishing roll made it possible to continuously produce amorphous metal ribbon.

That is, the gist of the present invention is to provide a method for obtaining an entire amorphous metal ribbon by continuously jetting and supplying molten metal from a nozzle slit onto the surface of a cylindrical cooling body rotating at high speed and rapidly solidifying the metal. This is a continuous manufacturing method for amorphous metal ribbon, which is characterized by polishing the entire moving body surface continuously or intermittently (two times) during the process.

All drawings of the present invention will be described in detail below.

In the figure, the cooling roll JO is configured in a desired cylindrical shape,
A tandish 15 is provided. The molten metal M is jetted and supplied from a nozzle 21 to a cooling roll 10 that rotates at high speed, and an amorphous metal ribbon S is formed therein and wound up by a winder 16. For smooth winding on the winding machine 16, for example, use an air jet to peel off the machine 17. Establishment (= establish based on.

In the present invention, a grindstone roll 18 is provided isolated from the winder 16 and in contact with the cooling roll 10. Grindstone roll 18
For example, a diamond electrodeposited grindstone may be used.

The grindstone roll 18 rotates in a direction opposite to the cooling roll 100 rotation direction (
It spins twice! It is not limited to 1 win. N2 gas injection pipe 20 and buffing material 19 are all arranged on the downstream side of the grindstone roll I8,
It is a good idea to collect all the polishing powder.

The grindstone roll 18 is rotated intermittently or continuously during production of the amorphous metal ribbon, so that the surface of the cooling roll always maintains a new roll surface, and even if microcracks occur due to the supply of molten metal, their growth is prevented. It can be prevented and is extremely suitable for practical training.

The present invention will be explained in detail below.

Amorphous metal ribbon manufacturing specifications; Copper alloy roll 400φX 1001UIIw, 25
m/sec rotating slit nozzle 0.6 x 5QII
IJ A71!20. System Fc-B-3i-C system 30m
An amorphous ribbon with a thickness of μ was obtained.

”-, the diamond electrodeposited grindstone (800 mesh) rotates at a total interval of 1.0 minutes to reduce the cooling roll surface'kO.
, 01, +i group/fjf cut, N2 jet and a surface cleaning device using a puff were installed to completely treat the polished surface.

Conventionally, crack troubles were seen in the cooling roll after 20 minutes of operation, but with the present invention, continuous operation for one hour is now possible.

[Brief explanation of the drawing]

Figures 1 and 2 are partially enlarged explanatory views of the cooling roll surface;
FIG. 3 is an explanatory diagram of the present invention. 10...-Cooling roll 12...Crack 15-
... Tanditshu 16 ... Winder 18 ... Grindstone roll 19 ... Buffing material 20 ... N2 injector 5 -

Claims (1)

[Claims] 1. An amorphous ribbon is formed by continuously jetting and supplying molten metal from a nozzle slit onto the surface of a cylindrical cooling body rotating at high speed and rapidly solidifying it. In the method for obtaining the cooling body surface during the production of the ribbon? A method for continuously producing an amorphous metal ribbon, which is characterized by continuous or intermittent polishing. 2. The continuous manufacturing method of an amorphous metal ribbon according to claim 1, characterized in that the surface of damaged parts generated on the surface of the cylindrical cooling body is polished while being cleaned.