JPS6048575B2 - Alloy manufacturing method using ultrasonic waves - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an alloy comprising a base metal and an additive element having a higher melting point than the base metal using ultrasonic waves.

Conventionally, to manufacture an alloy consisting of a base metal and an additive element with a higher melting point, a base alloy with a higher concentration of additive elements is poured into a molten base metal to produce an alloy with predetermined constituent components. He had a method.

However, in this method, a master alloy must first be manufactured, which increases the number of steps and increases the manufacturing cost compared to the method of direct addition. On the other hand, a method is known in which ultrasonic waves are applied to a molten metal material in order to refine the metal structure and homogeneously disperse it. FIG. 1 is an explanatory diagram of such an ultrasonic application method, in which a metal horn 2 connected to a vibrator 1 is directly immersed in molten metal 4 in a crucible 3, and ultrasonic waves are applied via the horn 2. This is how it was done. However, when the horn is directly immersed in the molten metal, cavitation occurs between the horn and the molten metal, and this causes erosion from the tip of the horn, shortening the length of the horn and shifting the resonance frequency of the ultrasonic system. There was a problem in that it was impossible to apply continuous ultrasound under such conditions. In addition, the length of the horn could not be made long enough to cause the vibration system to resonate sufficiently, and there was a risk that the heat of the molten metal would be conducted to the vibrator through the horn and destroy the vibrator. The present invention was made in view of the above situation, and instead of using the conventional master alloy, a rod made of an additive element with a higher melting point than that of the molten base metal is immersed in the molten base metal, and the molten metal is passed through the rod. By applying ultrasonic waves, the required amount of added elements is added to the molten base metal by utilizing the erosion of the rod due to the generation of cavitation, which was previously thought to be a drawback, in order to refine the metal structure and homogeneously disperse it. are mixed to produce an alloy having predetermined components.

That is, in the present invention, first, a metal serving as the base material of the alloy or a mixture of the base metal and an additive element having a lower melting point than the base metal is melted, and a rod made of the additive element having a higher melting point than the base metal is melted into the molten metal. is immersed in the rod, and ultrasonic vibration energy is applied to the molten metal through the rod.

This operation causes the rod to dissolve due to the erosion.
By applying this ultrasonic wave until the added element is dissolved in the required amount, an alloy with the desired components can be obtained. Alloy production by this method can be applied to either a batch method or a continuous casting method. In addition, if there are two or more types of additive elements that have a higher melting point than the base metal, it is also possible to immerse rods made of two or more types of additive elements in the molten metal at the same time and apply ultrasonic waves. Different types of additive elements may be sequentially dissolved. FIG. 2 shows an example of an apparatus for carrying out the method of the invention. That is, 5 is a converter that supports a rod 6 made of an additive element, a vibrator 7 is fixed to one end (left side in the figure) of this converter 5, and a fixed horn 8 for attaching to a frame 10 is attached to the other end. The vibrator 9 is fixed therethrough. This converter 5 is connected to the pillar 1 via the horn holder 11.
It is attached to 2 so that it can be raised and lowered. The rod 6 is inserted into the shaft hole (not shown) of the converter 5 and immersed in the molten metal 14 of the crucible 13, but the immersion part has a vibration amplitude a in the axial direction, as shown in FIG. Adjustment is made using the stopper 15 at the top of the converter 5 so that the belly portion b exists. According to the above device, when the rod 6 made of the added element becomes short due to melting, by moving the rod 6, the antinode of the vibration amplitude can always be immersed in the molten metal. 6 can be dissolved continuously and steadily.

In addition, since the converter 5 itself can be moved up and down or left and right,
The movement of the rod within the molten metal can be finely adjusted, and the rod can be quickly lifted from the surface of the molten metal during solidification or in an emergency. Furthermore, since the converter 5 and the vibrators 7 and 9 can be placed at a sufficient distance from each other so that they do not receive heat conduction from the molten metal 14, they must be sufficiently cooled. It is also possible. Next, the present invention will be specifically explained using examples. Example: Aluminum with a melting point of 660°C, which is the base material, has a melting point of 1539°C.
An alloy containing a mixture of iron is produced using the apparatus shown in FIG.

A steel bar was immersed in a molten metal 14 of 2k9 aluminum which was maintained at 700° C. by controlling a heater.

An L-shaped converter was used as the converter 5, and vibrations of 20 KHz were applied from an ultrasonic oscillator via vibrators 7 and 9. Conversion body 5
Since the vibration of the steel bar becomes the antinode of its amplitude at the lower end, by fixing the length of the bar with the stopper 15 so that it is an integer multiple of half a wavelength than the lower end of the converter 5, the tip of the bar can be fixed. Maximum amplitude is obtained.

FIG. 4 shows the change in iron content with respect to the application time of ultrasonic vibration at this time. Note that the above-mentioned round steel bar is a commercially available product and can be easily obtained at low cost.

Further, when the base metal is aluminum, various metal materials such as CU)Fe)NiNTi can be used as the additive metal depending on the intended alloy composition.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional ultrasonic application device, Fig. 2 is an explanatory diagram of an ultrasonic application device according to the present invention, Fig. 3 is an explanatory diagram of its operating state, and Fig. 4 is an illustration of the ultrasonic application time. It is a graph which shows the relationship between and Fe content. 5... Conversion body, 6... Rod made of an additive element having a higher melting point than the base metal, 14...
Molten base metal.

Claims (1)

[Claims] 1 A rod made of an additive element with a higher melting point than the base metal is connected to a converter connected to an ultrasonic vibrator, immersed in the molten base metal, and applied with ultrasonic vibration energy while melting it. A method for manufacturing an alloy using ultrasonic waves, characterized by: