JPH02290655A - Manufacture of cu-al-ni series alloy fine wire - Google Patents

Abstract

PURPOSE:To easily produce an alloy fine wire having round cross sectional face by regulating peripheral velocity of a drum and injection pressure of molten metal to satisfy the specific inequality at the time of injecting the molten Cu-Al- Ni series alloy containing the specific ratios of Al and Ni into cooling liquid layer in the rotating drum. CONSTITUTION:The Cu-Al-Ni series alloy composed of 11-15wt.% Al, 1-5% Ni and if necessary, 1-5% Mn, 0.1-5% Ti and the balance Cu is melted. This molten metal is injected into the rotating cooling layer in the rotating drum at the peripheral velocity of the drum and the injection pressure of the molten metal shown in the inequality 360P<1/2=v<=540P<1/2> [v: inner face peripheral velocity (m/s) in the drum, P: injection pressure (kg/cm<2>) of the molten metal]. Further, it is desireable that the molten metal temp. is higher than the m.p. by about 50-200 deg.C and injection nozzle diameter is about 0.05-0.20mm<2> and the injection pressure of the molten metal is >= about 1.0kgf/cm<2>. By this method, the Cu-Al-Ni series alloy fine wire having continuous round shape in the cross section is easily obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a method for manufacturing a Cu-Al-Ni alloy thin wire. [Prior art] Cu-Al--Ni alloy is Cu-14%A1-4%
Containing components such as Ni, it has been known as an alloy that has shape memory and superelastic effects, and is used as a device that simultaneously functions as a sensor and an actuator by utilizing the shape recovery temperature and its generated force. However, this Cu-Al--Ni alloy has extremely poor workability, and it has traditionally been considered impossible to produce thin wires or filaments by cold wire drawing. Additionally, one of the reasons for the poor workability of this alloy is that the crystal grains become coarser due to solution treatment.
In order to prevent crystal grain coarsening during solution treatment, Ti is added to refine the crystal grains and improve cold workability to some extent, but this is still not sufficient and it is difficult to actually manufacture fine wires. Have difficulty. On the other hand, as a grain refinement technology for copper-based shape memory alloys,
A method using rapid solidification is known, in which the molten alloy is quenched by being quenched by directly spraying it onto a water-cooled rotating roll, thereby instantaneously solidifying it. Rapid solidification using this single roll method has the advantage of directly producing a product in a short time, but it has the limitation that the shape obtained is ribbon-like. [Problems to be Solved by the Invention] The present invention has been made in view of the above-mentioned problem that it is extremely difficult to process thin wires from Cu-Al--Ni alloy, and The purpose of the present invention is to provide a method for manufacturing a CuAl-Ni alloy thin wire that can obtain a continuous thin wire with a circular shape. [Means for Solving the Problems] In order to obtain a Cu-Al--Ni based alloy thin wire, the present inventors
The present invention was completed by devising the idea of using a rotating liquid spinning method and finding optimal conditions for obtaining a continuous fine wire with a circular cross section.

The method for manufacturing the Cu-Al--Ni alloy thin wire of the present invention includes:
Weight ratio: Al: 11-15%, Ni: 1-5%, Mn.
1-5%, Ti; 0. Contains 1 to 5%,
The gist is to melt an alloy consisting of the remainder Cu and inject the molten alloy into a rotating cooling liquid layer formed in a drum that rotates four times at a circumferential speed of the drum at a molten metal injection pressure shown by the following equation. do. 360. rTf≦V≦ 540f, where: v: drum inner circumferential speed (m/s) p-molten metal injection pressure (kg/cm2) The conventional apparatus used in the rotating liquid spinning method is shown in the front view and in Fig. 1. This is shown in the side sectional view in Figure 2. In the figure, the cylindrical drum 10 includes a hollow cylindrical part 12, a coolant holding side plate 16 attached to one side of the hollow cylindrical part 12 and having a circular opening 14 in the center, and a side plate 16 that covers the entire surface of the other side of the cylindrical part 12. Block board 1
The output shaft 22 of a motor 20 is fixed to the center of the closing plate 18, and the drum 10 rotates at high speed. Cooling liquid is supplied to the inner circumferential surface of the drum 10 rotating at high speed, and the cooling liquid forms a cooling liquid layer 2 due to centrifugal force.
Form 4. The molten metal injection device 26 includes a vertical molten metal heating furnace 28, a molten metal injection nozzle 30 installed downward at the lower end of the molten metal heating furnace 28, and a molten metal pressurizing pipe 32 attached to the upper part of the molten metal heating furnace 28. It is inserted through the opening 14 of the drum 10 and is movable in the axial direction of the rotating drum 10. To obtain thin metal wire using this rotating liquid spinning device,
The drum 10 is rotated to supply cooling liquid to form a cooling liquid layer 24 on the inner peripheral surface of the drum 10 by centrifugal force. Next, the master alloy inserted into the molten metal heating furnace 28 is melted to form a molten alloy 34 , the molten metal injection device 26 is inserted from the opening 14 of the drum 10 , and the molten metal injection nozzle 30 is inserted into the cooling liquid layer 24 .
is positioned on the inlet end 24a of the. Next, an inert gas is sent into the molten metal pressurizing pipe 32 to pressurize the surface of the molten alloy 34 in the molten metal heating furnace 28, and the molten metal 34 is injected from the molten metal injection nozzle 30. At the same time, the molten metal injection device 26 rotates the cooling liquid. It moves slowly from the entrance end 24a of the layer 24 toward the inner end 24b. The injected molten alloy jet stream 36 is injected into the cooling liquid layer 24 and rapidly cooled to form the thin metal wire 3.
It becomes 8. By this method, thin metal wires 38 are continuously formed and accumulated in the rotating cooling liquid layer 24 within the drum 10. The Cu-A-I-Ni alloy to which the present invention is applied has B.I. Cr, Zr
Alternatively, it is better to add a small amount of Ce. The melting temperature of the CuAl-Ni alloy is preferably 50 to 200°C higher than the melting point. Melting temperature: 50℃ above the melting point
If the temperature is less than 20 degrees higher than the melting point, the nozzle may become clogged and the diameter of the thin wire may become uneven.
This is because when the temperature exceeds 0°C, the thin lines become discontinuous and become bead-like. The nozzle hole diameter of the rotating liquid submerged spinning device used in the present invention is preferably 0.05 to 0.20 mm2, and the molten metal injection pressure is 1. 0 kgf/
It is preferable to set it as cm2 or more. Nozzle hole diameter is 0.
If the nozzle diameter is less than 0.201 IIM2, the diameter of the thin wire will be too small to be cut, and if the nozzle diameter exceeds 0.201 IIM2, the cooling rate will be insufficient and the diameter of the thin wire will be uneven. Also, the molten metal injection pressure is 1. 0 kFif/
cm", the molten metal will not be sufficiently injected and the thin line will become discontinuous. The circumferential velocity V of the inner surface of the drum is preferably within the range of the above formula in relation to the molten metal injection pressure P. If the drum inner circumferential speed V is less than 360F, the winding speed of the thin wire is slow and the thin wire becomes wavy and discontinuous.If the drum inner circumferential speed V exceeds 540F, the winding speed of the thin wire is slow and the thin wire becomes discontinuous. This is because the winding speed of the drum increases and the thin wire becomes short fiber-like. [Function] The method for producing the Cu-Al--Ni alloy thin wire of the present invention includes
Weight ratio: Al: 11-15%, Ni: 1-5%, Mn.
An alloy containing 1 to 5% Ti, 0.1 to 5% Ti, and the balance consisting of Cu is melted, and the following formula is applied to the rotating cooling liquid layer formed in a drum that rotates at a circumferential speed of the drum as shown in the following formula. By injecting the molten alloy at the molten metal injection pressure shown in , a continuous Cu-Al--Ni based alloy thin wire having a circular cross section can be manufactured. 360,/] ≦V≦ 540,/
7 However, v: drum inner circumferential speed (m/=) P; molten metal injection pressure (kg/c 2) [Example] Preferred embodiments of the present invention will be described together with comparative examples,
The effects of the present invention will be clarified. Using the rotating liquid spinning apparatus shown in FIGS. 1 and 2, the drum 10 was rotated to supply water as a cooling liquid to form a cooling liquid J1ff24 on the inner peripheral surface of the drum 10 by centrifugal force. The drum 10 used had an inner diameter of 500 lIIm. Then 14%Al--3%Ni-2%Mn-1%Ti of Cu
-Al--Ni alloy is inserted into the molten metal heating furnace 28,
The molten alloy 34 was melted at 50° C., and the molten metal injection device 26 was inserted through the opening 14 of the drum 10, and the molten metal injection nozzle 30 was positioned above the inlet end 24a of the cooling liquid layer 24. Next, an inert gas is sent into the molten metal pressurizing pipe 32 to pressurize the surface of the molten alloy 34 in the molten metal heating furnace 28, and the molten alloy 34 is transferred to the nozzle hole diameter 0.5 k4/cIll2 so that the molten metal injection pressure becomes 1.5 k4/cIll2. 15 Nomaji molten metal injection nozzle 30
At the same time, the molten metal injection device 26 slowly moved from the inlet end 24a of the rotating cooling liquid layer 24 toward the inner end 24b. At that time, the shape of the thin metal wire 38 formed on the inner surface of the drum 10 was observed while changing the inner peripheral speed of the drum in five stages as shown in Table 1. The obtained results are also shown in Table 1. In addition, the molten metal injection pressure is 1
．． 5 k) 1/cI@2, so 360 fP
is 440, and 5 4 0/P is 661.

(Left below) Table 1 As is clear from Table 1, when the drum inner circumferential speed is 360
Number 1, which was smaller than E, had a wavy and discontinuous thin wire shape, and number 5, which had a drum inner peripheral speed greater than 540FT, had a short fiber shape and was unable to form a fine wire. Ta. On the other hand, the inner peripheral speed of the drum is 3
For numbers 2 to 4, which were larger than 60,/7 and smaller than 540,/7, a continuous thin wire with a circular cross section was obtained,
The effects of the present invention were confirmed. It was confirmed that the thin alloy wire manufactured by the manufacturing method of the present invention has an austenitic structure in the rapidly solidified and cast state, and exhibits a superelastic effect. Furthermore, when this thin alloy wire was heated to several hundred degrees, it became cast-in 4K, that is, straight, due to the shape memory effect. [Effects of the Invention] As explained above, the method for producing a CuAl-Ni alloy thin wire of the present invention employs a rotating liquid spinning method for this alloy in which it is difficult to produce a thin wire using a cold wire. At the same time, we have found the range of optimal conditions between the molten metal injection pressure and the inner circumferential speed of the rotating drum in the rotating liquid spinning method.
This makes it possible to easily manufacture Al--Ni alloy thin wires. In addition, the manufactured thin alloy wire has a shape memory effect and a superelastic effect, and is useful as an actuator that also serves as a sensor.

[Brief explanation of drawings]

IUjJ is a front view of the apparatus used in the present invention, and FIG. 2 is a side sectional view. 10. Drum, 24... Cooling liquid layer, 28...
Molten metal heating furnace, 30... Molten metal injection nozzle, 32... Molten metal pressurizing pipe, 38... Metal thin wire Figure 2 Z4b Z4a

Claims (2)

[Claims] (1) An alloy containing 11 to 15% of Al and 1 to 5% of Ni by weight, with the balance being Cu is melted and is formed in a rotary cooling drum that rotates at the circumferential speed of the drum as shown in the following formula. A method for producing a fine Cu-Al-Ni alloy wire, comprising injecting the molten alloy into a liquid layer at a molten metal injection pressure expressed by the following formula. 360√P≦v≦540√P where v: drum inner circumferential speed (m/s) P: molten metal injection pressure (kg/cm^2) (2) Al: 11-15%, Ni: 1-5% by weight,
Contains Mn: 1 to 5%, Ti: 0.1 to 5%, and the balance is C.
A molten alloy consisting of u is melted and the molten alloy is injected into a rotating cooling liquid layer formed in a drum rotating at a circumferential speed of the drum at a molten metal injection pressure shown by the following equation. - A method for producing an Al-Ni alloy thin wire. 360√P≦v≦540√P where v: drum inner circumferential speed (m/s) P: molten metal injection pressure (kg/cm^2)