SU1662749A1 - Method and apparatus for continuous casting of metal fibers - Google Patents

Abstract

The invention relates to metallurgy, in particular to the production of metal fibers with an amorphous or fine-crystalline structure in the process of quenching the melt on a movable crystallizer. The purpose of the invention is to provide the possibility of adjusting the fiber width at constant technological parameters of the melt supply and increasing the productivity of the process. Equally coaxially mounted, of equal diameter, the drum 1 and the disk 2 on the fixed axis 3 on the rolling bearings 4 rotate at a given speed in one or opposite directions with the possibility of adhesion with sliding end surfaces to each other. The holes are designed to supply a cooling medium to the inner surfaces of the drum and disc, and the rings 6 provide the necessary speed for cooling the surfaces. Feeder 7 with melt 8 is installed above the zone where the drum adjoins the disk and is connected with a movement drive along and across the region adjacent to adjust the thickness and width of the metal fiber. 2 sec. and 3 hp ff, 4 ill.

Description

Fig 2

The invention relates to metallurgy, in particular to the production of metal fibers with an amorphous or fine-crystalline structure in the process of quenching the melt on a movable crystallizer.

The purpose of the invention is to provide the possibility of adjusting the fiber width at constant technological parameters of the melt supply and increasing productivity.

1 shows a diagram of the device for implementing the method; figure 2 - section aa in figure 1; Fig. 3 shows a device when moving a disc and a drum in one direction; Fig. 4 shows the device when moving the disc and the drum in opposite directions.

The flow of the melt at the same time on the parts of the forming mutually displaceable surfaces provides displacement of the formed metal layers relative to each other. The separation of the formed thin layer by its width is ensured by the fact that during the formation of the adhesion force of the formed layer with the shaping surface exceed the intermolecular interaction forces in the solidifying melt along the line of abutment of the mutually displaceable surfaces.

The device for producing metal fiber comprises hollow drum 1 and disk 2 of equal diameter, mounted on fixed axis 3 by means of rolling bearings 4. In axis 3, a system of holes 5 is provided for supplying a cooling medium, for example gas, to the inner surfaces of drum 1 and disk 2, and disk 2 adjoins drum 1 with the end surface sliding along the end surface of drum 1, the required flushing speed of the internal surface of drum 1 and disk 2 is reached by mounting the rings 6 on the axis 3 with an annular gap to the inner surfaces of the disk 2 and the drum 1. The feeder 1 with the melt 8 is installed above the abutment zone of the disk 2 to the drum 1 and is connected with a movement drive along and across adjoining (drive not shown).

The device works as follows.

Coaxially mounted on a fixed axis 3 by means of bearings 4, drum 1 and disk 2 of the same diameter, adjacent to each other with sliding face surfaces, are rotated at specified speeds by drives (not shown) in the same or opposite directions. Melt 8

from the feeder 7 installed above the disk adjoining area to the drum, are fed to the side surfaces of the drum and the disk under the pressure of an inert gas, for example argon, where it spreads as a thin metal layer with a width determined by the rate of melt 8 outflow from the feeder 7, the feed angle of the melt 8 to the disk and the drum, the distance from the feeder 7 to the surfaces 0 of the disk and the drum, the speed of rotation of the disk and the drum, their diameter and the diameter of the outlet of the nozzle of the feeder 7.

During the formation of a thin metal layer, parts of the layer that are formed on the surface of the disk and the drum experience displacement relative to each other along the line of the disk's abutment to the drum. The displacement of the layers causes shear deformations along the line of the disk's abutment to the drum and a thin layer layer along its width during the formation of the product (layer) along the line of abutment on the fibers 9 and 10. The stability of the separation of the formed layer along the line of the abutment of the disk and drum provides the selection of the corresponding difference and rotational speeds of the disk and drum. The required velocity difference between the disk and the drum is selected for each specific melt 0 and the process parameters

Rotation of the disk and the drum in the same direction with a given velocity difference changes the thickness of the layer formed both on the disk and on the drum. If you change the feed angle of the melt, for example, as the feed angle increases, the thickness of the layer increases both on the disc and drum at constant rotational speeds.

When the disk and the drum rotate in one direction, a difference in the thickness of the melt layer formed on the disk and the drum is observed, which is caused by the difference in the speeds of the disk and the drum

When the disk and the drum rotate in opposite 5 directions with the same speed and when the melt is fed normal to the surfaces, the thicknesses of the layers formed on the disk and the drum are equal, which excludes the subsequent sorting of the product by thickness.

The metal layers are cooled at a rate of about 10 K / s and the finished fibers 9 and 10 are separated from the forming surfaces by centrifugal forces. 5If necessary to obtain fiber

strictly specified width, the active control of the fiber width by known methods is carried out and, if necessary, the feeder 7 with melt 8 across the zone of the junction of the disk to the

the drum. The drum and disc are cooled by washing their internal surfaces with a cooling medium, such as gas.

Example. A disc and a drum of beryllium bronze with polished side surfaces and the same diameters of 80 mm are used.

Melt quenching from bronze is performed in the following mode. The rotation of the disk and the drum is carried out in opposite directions with the same linear speed of the forming surfaces, equal to 12.56 m / s (3000 rpm). The revolutions are controlled using the TsAT-2M automatic tachometer. The nozzle diameter of the outlet of the quartz feeder 150 microns. Melt feed angle 0 ° (angle between the normal to the lateral surfaces of the disk and the drum and the axis of the melt jet). The distance from the nozzle of the feeder to the surfaces of the disk and the drum is 2 mm. The gas pressure (argon) above the melt in the feeder 0.8 atm. The feeder nozzle is installed symmetrically with respect to the line of sliding of the disk and the drum (in the transverse direction). The temperature of the molten bronze melt 1050 ° C.

Compared with the known method of feeding the melt to only one surface, for example a drum (ceteris paribus), the proposed method and device allow obtaining a metal fiber two times smaller, and the productivity is increased by 100%.

Claims (5)

Claims 1. Method for continuous casting of metallic fibers, including feeding melt to a moving forming surface, cooling it and then separating it from the forming surface, characterized in that enabling adjustment of the fiber width with constant technological parameters of the melt supply and increasing productivity, the melt feed is carried out simultaneously on mutually displaced along the formed layer of metal fiber portions of the forming surface. 2. A method according to claim 1, characterized in that the portions of the shaping surface are displaced in one direction. 3. A method according to claim 1, characterized in that the portions of the forming surface are shifted in opposite directions. 4. A device for continuous casting of metal fibers, holding the drum mounted rotatably, and a feeder with a melt, characterized in that, in order to be able to control the width of the resulting fiber with constant technological parameters of the melt feed and increase productivity, additionally provided with a disc with a diameter equal to the diameter of the drum and installed coaxially with it with the possibility of rotation and abutting the end surface to its end surface, and a melt feeder is installed above the disk abutment area 5. The device according to claim 4, characterized in that the melt-type feeder is mounted for movement along the abutment zone and perpendicular to it. M N o j 3 --J Xi (O iiVi n 7) L WAI / is smiling N | ABOUT fig R  Md