JP3695192B2 - Manufacturing method of composite metal tube - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a composite metal tube, and more particularly to a manufacturing method for manufacturing a long composite metal tube.
[0002]
[Prior art]
In heat exchangers, for example, when dissimilar metal pipes such as aluminum pipes and copper pipes are connected, it is difficult to directly connect them by brazing or the like. ing.
[0003]
FIG. 2 shows an example of a pipe joint, which is composed of a copper inner layer 15 and an aluminum outer layer 16 partially integrated with each other. The inner layer 15 is inserted into the copper pipe that is one of the pipes to be connected, and the aluminum pipe that is the other pipe to be connected is inserted into the outer layer 16, so that the homogenous pipes that are brought into contact with each other are joined together. Connect by brazing.
[0004]
FIG. 3 shows a composite metal tube which is a raw material of the pipe joint. The pipe joint is obtained by cutting a composite metal tube as shown in the figure into a predetermined length, and then removing predetermined portions of the inner layer 15 ′ and the outer layer 16 ′. Made by removing like.
[0005]
4 shows a method of manufacturing the composite metal tube of FIG. 3, wherein 17 is a copper tube inserted over the core body 18, 19 is an aluminum tube concentrically disposed outside the copper tube 17, Indicates an explosive layer provided around the head of the aluminum tube 19 and the core body 18 so as to wrap them, and 21 indicates a cover covering the whole.
[0006]
Denoted at 22 is a detonator, the explosive layer 20 is detonated by the detonator 22, the aluminum tube 19 is contracted by the applied pressure at that time, and the copper tube 17 and the aluminum tube 19 are pressed. The composite metal tube obtained by this method does not produce a brittle intermetallic compound due to the solid-phase pressure welding, and thus becomes an optimal pipe joint material in which the inner and outer layers are firmly integrated.
[0007]
[Problems to be solved by the invention]
However, according to the conventional method of manufacturing a composite metal tube, the length of the product obtained by one operation unit is short and a lot of time and labor are required for the setup, so that the manufacturing efficiency is low. There are many high-cost factors such as having to prepare the metal tube separately.
[0008]
Accordingly, an object of the present invention is to provide a cost-effective method for manufacturing a composite metal tube that is excellent in manufacturing efficiency and does not require separate preparation of two metal tubes.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a passage formed by a groove formed on the outer periphery of a rotating wheel that rotates in a predetermined direction and a shoe block that covers the groove over a predetermined arc length of the rotating wheel. A material formed at the back of the shoe block so that the metal material is drawn in by the rotation of the rotating wheel in the predetermined direction, and the drawn metal material is led to the passage by the rotation of the rotating wheel in the predetermined direction. The metal tube is fed into the material collecting chamber and the extrusion die communicated with the metal tube from the outside by feeding the metal tube into the through-hole communicating with the material collecting chamber of the shoe block, and the introduced metal tube a method of producing a composite metal tube and the metal material fed into the material collection chamber on the circumference by coating extruded from the extrusion die The metal tube is contracted by a combination of a floating plug located inside the metal tube and a drawing die located outside the metal tube, and then fed into the through hole of the shoe block. In another aspect of the present invention, there is provided a method of manufacturing a composite metal tube, wherein a portion passing through a chamber and the extrusion die is supported from the inside by a support plug connected to the floating plug .
[0010]
The metal tube and the metal material are not particularly limited in material, but in many cases, the metal tube is made of copper or a copper alloy, and aluminum or an aluminum alloy is used as the metal material.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a method for manufacturing a composite metal tube according to the present invention will be described.
In FIG. 1, reference numeral 1 denotes a rotating wheel, 2 denotes a groove formed on the outer periphery thereof, 3 denotes a shoe block that covers the groove 2 over a predetermined arc length of the rotating wheel 1, and between the groove 2 and the shoe block 3. As a result, the passage 4 is formed.
Reference numeral 5 denotes a material collecting chamber formed in the back of the shoe block 3 so as to communicate with the passage 4, and 6 denotes an extrusion die provided in communication with the material collecting chamber 5.
[0013]
Reference numeral 7 denotes a through-hole formed in the shoe block 3 so as to communicate with the material collecting chamber 5, and 8 denotes a copper pipe fed into the through-hole 7 from the outside.
The copper tube 8 is contracted to a predetermined size by a combination of the floating plug 9 located on the inner side and the drawing die 10 located on the outer side, and then fed into the through hole 7.
[0014]
A support plug 12 is connected to the floating plug 9 via a connecting member 11, and the support plug 12 supports the inner surface of the copper tube 8 at the position of the material collecting chamber 5 and the extrusion die 6.
[0015]
In the above configuration, when the aluminum material 13 is drawn into the passage 4 by the rotation of the rotating wheel 1, the aluminum material 13 generates heat due to friction while passing through the passage 4, and enters the material collecting chamber 5 under high pressure. It is sent.
[0016]
The aluminum material 13 fed into the material collecting chamber 5 is brought into close contact with the periphery of the copper tube 8 and is pushed out together with the copper tube 8 from the extrusion die 6.
Since the copper tube 8 and the aluminum material 13 are pressed against each other under a high pressure based on the rotation of the rotating wheel 1, the bonding between the two becomes strong.
[0017]
Moreover, if a long product is prepared as the copper tube 8 or the copper tube 8 is continuously supplied, it becomes possible to manufacture the composite metal tube 14 more efficiently in each stage as compared with the prior art. Since the setup evaluated by the product quantity in the unit is minimized, the composite metal tube 14 can be manufactured at a low cost.
[0018]
Further, the effect of directly dropping the aluminum material 13 is great. Compared to the conventional manufacturing method in which the aluminum pipe is separately prepared, the process for manufacturing the aluminum pipe is omitted. To reduce.
[0019]
In the present embodiment, since the inner surface of the copper tube 8 is supported by the support plug 12 connected to the floating plug 9, the copper tube 8 is formed in the material collecting chamber 5 and the extrusion die 6 where high pressure is applied. Therefore, it is possible to manufacture a high-quality composite metal tube. It is possible to expect the action of a nipple for preventing uneven thickness on the support plug 12.
[0020]
【The invention's effect】
As described above, according to the method for manufacturing a composite metal tube according to the present invention, the metal material is applied to the passage formed by the groove provided on the outer periphery of the rotating wheel and the shoe block that covers the groove by the rotation of the rotating wheel. By pulling it in and feeding it into the material collection chamber formed in the back of the passage, coating this metal material on the metal tube that is fed into the through hole of the shoe block and passes through the material collection chamber, and extruding it from the extrusion die Since the composite metal tube is manufactured, the composite metal tube can be manufactured efficiently.
[0021]
In addition, since it is not necessary to separately prepare a metal tube for compounding as in the conventional case, a composite metal tube can be manufactured at a low cost as a whole. Therefore, it is possible to manufacture a high-quality composite metal tube in which the inner and outer layers are firmly bonded.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an embodiment of a method for producing a composite metal tube according to the present invention.
FIG. 2 is an explanatory view of a pipe joint.
FIG. 3 is an explanatory view of a composite metal pipe that is a raw material of a pipe joint.
FIG. 4 is an explanatory view showing a conventional method of manufacturing a composite metal tube.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotating wheel 2 Groove part 3 Shoe block 4 Passage 5 Material gathering chamber 6 Extrusion die 7 Through hole 8 Copper tube 9 Floating plug 10 Drawing die 11 Connection member 12 Support plug 13 Aluminum material 14 Composite metal tube

Claims (1)

By rotation of the rotating wheel in the predetermined direction into a passage formed by a groove formed on the outer periphery of the rotating wheel rotating in a predetermined direction and a shoe block that covers the groove over a predetermined arc length of the rotating wheel. Pull in metal materials,
The drawn metal material is fed into a material collecting chamber formed at the back of the shoe block so as to communicate with the passage by rotation of the rotating wheel in the predetermined direction,
Introducing the metal tube into an extrusion die communicated with the material collecting chamber by sending a metal tube from the outside into a through hole communicating with the material collecting chamber of the shoe block,
In the method of manufacturing a composite metal tube that covers the metal material fed into the material collecting chamber on the circumference of the introduced metal tube and extrudes it from the extrusion die ,
The metal tube is contracted by a combination of a floating plug located inside the metal tube and a drawing die located outside the metal tube, and then fed into the through hole of the shoe block, A method for producing a composite metal tube, wherein a portion passing through the extrusion die is supported from the inside by a support plug connected to the floating plug .

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