JPS58132357A - Nozzle for production of broad and thin amorphous alloy strip - Google Patents

Abstract

PURPOSE:To make the thickness of a thin alloy strip uniform by dividing the inlet part of a nozzle slit which injects molten metal to a rotary cooling body with a gate and forming outlet parts into one body with the slit connecting part privided in the lower part of the gate, thereby preventing the deformation of the slit. CONSTITUTION:A titlted nozzle wherein the inlet part 5 of a nozzle slit which injects and supplies molten metal continously onto the surface of a cooling body under high speed rotation is divided by a gate 8 and the outlet parts 6 of the nozzle slit are formed into one body with the slit connecting part 7 provided in the lower part of the gate 8. The central part of the slit is not deformed by thermal expansion or contraction, whereby the thin alloy strip having uniform thickness distributions is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nozzle for producing wide amorphous alloy ribbon.

A liquid quenching method has been proposed as a method for manufacturing amorphous metal ribbons. In particular, the single roll method is considered suitable for mass production of plates. When performing continuous mass production using the single roll method, nozzle life is especially important, and fine ceramics are the most suitable material. Since this is expensive and fragile, it is used as small and thin as possible.

As shown in FIGS. 1 and 2, a slit nozzle 2 reinforced with a reinforcing member 3 made of an inexpensive material and having a fitting hole is suitable. 1 is a tongue pusher, and 4 is a cooling roll.

In the single roll method, the thickness of the amorphous ribbon product is determined by the relationship among the peripheral speed of the cooling roll, the pressure of the molten metal, and the shape of the slit of the nozzle. In particular, if the slit shape is deformed and the central portion expands or contracts, the thickness of the ribbon will become non-uniform, causing an important problem that will result in the product being rejected.

However, the shape of the slit is easily deformed due to non-uniform thermal expansion. Normally, since the inside of the slit becomes high temperature, the central portion expands and the thickness direction of the central portion of the slit becomes narrow.

This becomes worse as the width of the slit increases, and there is no problem with a thin strip width of about 50mm, but
As the thickness increases, the center of the slit closes in the thickness direction, resulting in a serious defect such as the center of the product ribbon being cut and separated into two pieces.

The present invention provides a slit nozzle that solves this problem. In an apparatus for obtaining an amorphous alloy ribbon, the entrance part of the slit nozzle is divided by a weir provided inside the nozzle slit, and
The present invention is characterized in that the nozzle slit outlet portion is integrated with the slit communication portion provided at the bottom of the layer.

The present invention will be explained in detail below with reference to the drawings.

FIG. 3 shows a nozzle according to the present invention, in which nozzle 2
The slit is divided into two by a weir 8 into a slit entrance part 5.5, a slit communication part 7 is provided at the lower part of the layer 8, and the slit exit part 6 is integrated. A plurality of layers 8 can be provided depending on the width of the slit.

Note that the shape of the weir in Figure 3 is rectangular in the C-C cross section of the same figure, but it is not limited to this, and it can be made narrower in the direction of the slit exit to have the effect of smoothing the flow. It's okay. Figure 4 is a sectional view taken along the line b-b in Figure 3, and Figure 5 is a cross-sectional view of Figure 3.
A sectional view taken along the line a-a in the figure is shown.

Example 1 In manufacturing an FeB51C amorphous ribbon 150 mm wide and 30 um thick, two 51 m wide weirs were installed to divide it into three equal parts, which were connected at the outlet to form slits (width 0.6 ill).

When using a layer depth of 5), the roll circumferential speed was 30 m.
/s and a roll-to-nozzle gap of 0.2 inches, a ribbon with a very uniform thickness distribution was obtained.

[Brief explanation of the drawing]

Fig. 1 is an overall view of the conventional example, Fig. 2 is an explanatory view of the slit nozzle of the conventional example, Fig. 3 is a detailed explanatory view of the present invention, and Fig. 4 is a sectional view taken along the line b-b in Fig. 3. , Figure 5 is a-a of Figure 3.
It is an arrow sectional view. 2: Nozzle 5.5 Nislit entry part 7: Slit connection part 8: Weir No. 7 Fig. 2

Claims (1)

[Claims] In an apparatus for obtaining a wide amorphous alloy ribbon by continuously injecting and supplying molten metal from a nozzle slit onto the surface of a cooling body rotating at high speed and rapidly solidifying the metal, the inlet of the nozzle slit is provided inside the nozzle slit. It was divided by a weir and provided at the bottom of the layer. 1. A nozzle for producing a wide amorphous alloy ribbon, characterized in that a nozzle slit exit portion is integrated with a slit connecting portion.