JPS5916941A - Manufacture of alloy by ultrasonic waves - Google Patents

Abstract

PURPOSE:To obtain an alloy having predetermined components, while contriving to change its metallurgical structure into a finely and uniformly dispersed state, by immersing a rod composed of an additional element having a m.p. higher than that of a basic metal in the melt of said basic metal, and applying ultrasonic waves through said rod to the melt. CONSTITUTION:An alloy of Al having a m.p. of 660 deg.C mixed with Fe having a m.p. of 1,539 deg.C, for instance, is manufactured in the method as follows: Rod steel 6 is immersed in the melt 14 of the Al underneath held at 700 deg.C by the control of a heater. Oscillation of 20kHz is applied from an ultrasonic oscillator through piezoelectric transducers 7, 9 to a Type L-L transducer being used as a transducing body 5. Hereon, the rod steel 6 is fixed with a fixing tool 15 in a manner such that the length from its lower end comes to an integer times the half-wave length to obtain the maximum amplitude at the top end of the rod steel 6, since the oscillation of the rod steel 6 at the lower end of the transducing body 5 comes to the node of the amplitude. Thus, the rod steel 6 is continuously and steadily dissolved in the melt 14 to obtain the Fe-dissolved Al alloy. In the Drawing, (b) represents the node part of the oscillation amplitude (a) of the rod steel 6.

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. I had a method.

However, in this method, a master alloy must be manufactured first, and the manufacturing cost is higher due to a larger number of elements compared to a method of directly adding elements. 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, which causes two lotions to occur from the tip of the bone, shortening the length of the horn and shifting the resonance frequency of the vibration system. There was a problem in that it was impossible to apply ultrasound continuously in a steady state.

Furthermore, 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 bones 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 having 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 additive elements can be mixed into 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 make the metal structure finer and more homogeneous. However, an alloy having predetermined components is manufactured.

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 the additive element having a melting point higher than the above is added to the molten metal. A rod made of aluminum is immersed in the molten metal, 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 required amount of the additive element is dissolved, an alloy with the desired components can be obtained. Alloy production by this method can be applied to either a patch method or a continuous casting method. In addition, if there are two or more additive elements with melting points higher than the base metal, it is also possible to immerse rods made of two or more additive elements in the molten metal at the same time and apply ultrasonic waves, or as necessary. 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 the rod 6 made of the additive element,
A vibrator 7 is fixed to one end of this converter 5 (left side in the figure),
A vibrator 9 is fixed to the other end via a fixed horn 8 for attachment to a frame 10.

The converter 5 is attached to a support 12 via a horn holder 11 so as to be able to rise and fall. 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 on the top of the converter 5 so that the belly portion is present.

According to the above device, when the rod 6 made of the added element becomes short due to melting, by moving the rod 6,
Since the antinode of the vibration amplitude can always be immersed in the molten metal, the rod 6 can be melted continuously and steadily. Still, since the converter 5 itself is movable 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 pulled up from the surface of the molten metal when the molten metal solidifies or in an emergency. Also, a converter 5 and a vibrator T.

9 can be provided at a sufficient distance from which heat is not conducted from the molten metal 14, so that sufficient cooling can be performed.

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 mixed with iron at a temperature of 0.degree. C. is produced using the apparatus shown in FIG.

A steel bar was immersed in two molten aluminum ingots 14 that were maintained at 700° C. by controlling a heater. Conversion body 5
An L-L converter is used to connect the ultrasonic oscillator to the transducer 7.
．． Vibration of 2 (I KHz) was applied through 9.

Since the vibration of the steel bar becomes the antinode of its amplitude at the lower end of the converter 5, the length of the steel bar is fixed with the stopper 15 so that it is an integral multiple of half a wavelength than the lower end of the converter 5. Maximum amplitude is obtained at the tip of.

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. In addition, when the base metal is aluminum, Q u is used as the additive metal.

Various metal materials such as PE, Ni, Ti, etc. can be used depending on the intended alloy composition.

[Brief explanation of drawings]

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 patent applicant Yazaki Corporation Figure 4

Claims (1)

[Claims] 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, and immersed in the molten base metal to melt it and apply ultrasonic vibration energy. A method for manufacturing an alloy using ultrasonic waves, characterized by: