JPH0753291B2 - Continuous production method of fiber reinforced metal pipe - Google Patents

Description

TECHNICAL FIELD The present invention relates to a continuous method for producing a fiber-reinforced metal pipe.

(Prior art and problems) As a continuous manufacturing method of fiber reinforced metal (FRM) pipe, chop or whiskers of reinforcing fiber is dispersed in a molten metal of matrix metal, and this is formed into a pipe by extrusion or pultrusion molding method. However, this has the drawback that it is short fiber reinforced and only low tensile strength, bending strength and compressive strength can be obtained.

As a continuous fiber reinforced method for improving this drawback, a preform is made by winding a reinforced continuous fiber around a metal or graphite as a core, melt-impregnated with a matrix metal, and then processed to form a core. The melt impregnation method of removing and obtaining pipes is practiced in the laboratory. However, this method is not a method for forming a continuous pipe, but there is a facility limitation on the length of the pipe to be formed, and a thin wall cannot be used. Thus, up to now, no continuous production method of a thin pipe made of fiber reinforced metal has been known.

(Means for Solving the Problems) In view of the above situation, the inventors of the present invention have conducted various studies to develop a continuous method for producing a thin-walled fiber-reinforced metal pipe, and as a result of the research, The preform wire is preheated and aligned through a preheat alignment guide from a supply part arranged in an annular shape of the reform wire, for example, a bobbin around which the preform wire is wound, and supplied on the ultrasonic vibration mandrel. It has been confirmed that the preform wires are joined to each other by passing through the gap between them and ultrasonic vibration energy is applied during the gaps, and they are plastically processed to obtain a continuous fiber-reinforced metal pipe, thereby achieving the present invention.

In the method of the present invention, a preformed wire in which reinforced continuous fibers are pre-composited with a matrix metal is used. As the reinforcing fibers, carbon fibers (polyacrylonitrile (PAN) -based, pitch-based), alumina fibers, silicon carbide (S
iC) fibers are used, and the matrix metal is magnesium (Mg), aluminum (Al), zinc (Zn), copper (Cu), titanium (Ti), silver (Ag), gold (Au), etc., and their alloys, etc. However, the system is not limited to one of these, and a system selected from a wide range is used. The preform wire in which the reinforcing fibers and the matrix metal are compounded preferably has a diameter of 0.1 to 5 mm, and the cross-sectional shape does not necessarily need to be circular, and may be rectangular or irregular. good.

The present invention will now be described with reference to the drawings.

In carrying out the method of the present invention, as shown in FIG. 1 (a), the preheating wire is fed from the feeding portion 6 of the preforming wire 5, for example, the bobbin wound with the preforming wire. 3 through which the preform wire is preheated, aligned and then fed onto the ultrasonic vibrating mandrel 2.

The bobbins are arranged in a ring shape in a number determined by the size of the pipe to be manufactured.
As shown in FIG. 3C, the preform wire 5 is supplied toward the preheating aligning section 3. Preheating is carried out to impart plasticity to the wire and is preferably carried out at a temperature in the range of 200 to 500 ° C. If the preheating temperature is lower than 200 ° C, the plasticity of the preformed wire is insufficient, the bonding between the wires is insufficient, or the fibers in the wire are damaged by vibration, and the pipe characteristics are deteriorated. On the other hand, when the temperature exceeds 500 ° C., an oxide film is likely to be formed on the surface of the wire, the bondability is deteriorated, the strength of the wire is deteriorated, and the die or mandrel is likely to be aggregated, which is not preferable.

Next, the wire 5 is passed through the gap between the mandrel 2 and the ultrasonic vibration die 1, and the ultrasonic vibration energy by the vibrator 7 of the ultrasonic die arranged as shown in FIG. The plastic working is performed and the fiber reinforced pipe is continuously taken from the take-up part 4. In this case, die 1
It goes without saying that the clearance between the mandrel 2 and the mandrel 2 is adjusted in advance. The ultrasonic vibration is set to 5 to 100 KHz, the contact portion amplitude is set to 2 to 40 μ, and preferably the ultrasonic vibration is set to 15 to 25 KHz and the amplitude is set to 5 μ or more. Ultrasonic vibration is subject to restrictions in the design of an abnormal vibration system, and it becomes difficult to generate enough energy itself when the amplitude exceeds 40μ, and at the same time the wire and the ultrasonic horn are joined. On the other hand, if it is smaller than 2 μm, the pressing force due to vibration becomes small, and the plastic deformation and joining of the wire are insufficient, which is not desirable.

The die 1 and the mandrel 2 are oscillated synchronously or individually depending on the material to be processed, and further the ultrasonic wave vibration of only one of the die and the mandrel is used for processing.

By the above method, a pipe having a fiber reinforced direction of 0 ° with respect to the pipe axis can be obtained, but a predetermined angle is given to the wire by the aligning guide portion and a certain rotation is given by the take-up portion 4 to obtain a predetermined rotation. Angle reinforced fiber reinforced metal (FRM) pipes can be obtained.

Further, by forming the wire supply unit 6 as a multi-layer structure and rotating one layer as a whole, it is possible to form a multi-layer two-way reinforced pipe having 0 ° direction and angle reinforced. Of course, a multi-layer multi-directional reinforced pipe can be formed by the same method.

(Examples and Comparative Examples) The present invention will be described with reference to the following Examples and Comparative Examples.

Comparative Example 1 A SiC whisker was used as an Al alloy (AC4
C) and then extruded to form an FRM inner diameter of 12
A continuous pipe of mm × outer diameter 14 mm was obtained.

Comparative Example 2 A graphite rod having a diameter of 12 mm and a length of 150 mm covered with a sleeve of SiC continuous fiber (Nicalon, manufactured by Nippon Carbon Co., Ltd.) was used as pure Al with a fiber volume content of 30% in an autoclave.
Melted and impregnated, then processed, FRM inner diameter 12 mm ×
A pipe with an outer diameter of 17 mm and a length of 150 mm was obtained.

Example 1 Preformed wire of 0.5 mm in diameter composed of SiC continuous fibers having a diameter of 14 to 15 μm and pure Al (volume content of fibers 40
%) In the preheat aligning section using the device shown in FIG. 1 (a).
Preheat to 300 ℃, align and supply to the mandrel, then pass through the gap (0.4 mm) between the ultrasonic vibration die and the mandrel, while applying ultrasonic waves only to the ultrasonic die, ultrasonic vibration 20 KHz, amplitude 20 μm Joined, plastically processed and drawn at a drawing speed of 0.75 m / min: One-way strengthened (length direction) inner diameter
A continuous pipe made of FRM having an outer diameter of 12 mm and an outer diameter of 12.8 mm was obtained.

Example 2 The same preform wire as in Example 1 was used, and in this example, the inner layer was fed in two layers of 0 ° direction and the outer layer was in 45 ° direction, so that two layers of inner diameter 12 mm × outer diameter 13.6 mm were bidirectional. A reinforced FRM pipe was made. The drawing speed in this case was 0.75 m / min, ultrasonic waves were applied to both the die and mandrel, and
A vibration of 20 KHz and 20 μm was applied. The gap between the ultrasonic vibration die and the mandrel was 0.6 mm.

The bending strength, bending elastic modulus, and annular compression strength of the FRM pipes of Examples 1 and 2 and Comparative Examples 1 and 2 were measured, and the obtained results are shown in Table 1.

(Effects of the Invention) As described above, according to the method of the present invention, a preformed wire in which a reinforced continuous fiber and a matrix metal are combined is used, and ultrasonic vibration is utilized to form a pipe by plastic working. Unlike the melt impregnation method, molding can be performed at a low temperature, whereby a high-strength continuous fiber-reinforced thin metal pipe can be obtained without impairing the strength of the preform wire. Further, there is an effect that the structure or the multi-layered structure can be freely constructed by setting the fiber reinforced direction to 0 ° or a predetermined angle with respect to the pipe axis.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a) is a conceptual diagram of continuous production of a fiber-reinforced metal pipe of the present invention, FIG. 1 (b) is a front view of the ultrasonic die of FIG. 1 (a), FIG. 1 (c) is a sectional view taken along the line XX 'in FIG. 1 (a). 1 ... Ultrasonic Die, 2 ... Ultrasonic Mandrel 3 ... Preheating Alignment Section, 4 ... Take-Up Section 5 ... Preform Wire 6 ... Preform Wire Supply Section 7 ... Transducer

Claims (1)

[Claims] 1. A preform wire is fed from an annularly arranged feed portion of a preform wire in which reinforced continuous fibers are compounded with a matrix metal through a preheat aligning guide to preheat and align the preform wires and feed them onto an ultrasonic vibration mandrel. , A continuous manufacturing method of a fiber-reinforced metal pipe, characterized in that the preform wires are joined and plastic-formed by ultrasonic vibration energy while passing through a gap between the ultrasonic vibration die and the mandrel.