JPS602953B2 - Composite joint manufacturing method and manufacturing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement of composite joints, and involves disposing of dissimilar metal members by using the heat capacity of the molten metal and the diffusion energy of the pressure applied to the setting sun to form an intermediate alloy between the dissimilar metal members. A composite joint which obtains a metallic bond and has excellent weldability by plastically deforming a part of a casting assembly exhibiting a fine molten metal forged structure obtained by solidification after delivery to a forged structure, and a method for producing the same. The present invention relates to an apparatus for manufacturing the same, and in particular to a composite joint used as a composite joint for welding dissimilar metal pipes, a method for manufacturing the same, and an apparatus for manufacturing the same.

Conventionally, composite joints, especially composite joints for welding dissimilar metal pipes, etc., have been made by joining dissimilar metal members with forged structures by friction saddle or explosive pressure saddle, but both of these are mechanical joints. Moreover, since it is a solid-to-solid bond, dissimilar metals may be bonded due to the effects of the welding heat generated when welding the composite joint for welders and the metal pipe, the temperature of the medium circulating inside during use, or the internal pressure. There was a problem in that the degree of bonding and airtightness between members were impaired.

The present invention has been made based on the above circumstances, and includes a first metal pipe material having a forged structure, the first metal pipe material being made of different metals, and a second metal pipe material having a cast structure and a forged structure. a composite joint comprising a metal pipe material, wherein the first metal pipe material and the second metal pipe material are bonded to a part of the cast structure of the second metal pipe material, and a forged structure. A first metal tube material having a metal tube having a diameter of 1.5 mm is placed in a mold, and a molten metal forming a second metal tube material made of a metal different from that of the first member is poured into the mold to form the mold. After sealing the molten metal, pressure is applied to the molten metal, and solidification of the molten metal is completed under this pressure to form a second metal pipe material, and the first metal pipe material is mirror-attached to the second metal pipe material. Then, a part of the mold is closed and further pressurized to cause a part of the second metal pipe to flow out from the spout of the mold, thereby causing plastic deformation in the second metal pipe. A method for manufacturing a composite joint, characterized in that the upper part is open for pouring the molten metal forming the second metal tube, and one end of the first metal tube having a forged structure projects from the inside. a mold having an opening at the bottom, a core for closing the entrance at the bottom of the mold and supporting the first metal pipe material, and closing the opening at the top of the mold, and It is an object of the present invention to provide an apparatus for manufacturing a composite joint, characterized in that it is comprised of a plug mold and a punch mold that can be moved up and down to apply pressure inside the mold. Hereinafter, the accompanying drawings and reference photographs showing one embodiment of the present invention will be described.
*Figure 1 shows a cross-sectional view of the composite joint of the present invention.
A stainless steel tube 1 having a forged structure as shown in Reference Photo 1, and a hollow aluminum alloy material having a forged structure part A and a forged structure part B exhibiting a fine molten moat forged structure as shown in Reference Photo 1. 2, the stainless steel pipe 1 and the hollow aluminum alloy member 2 are the hollow aluminum alloy member 2.
At part A of the casting structure, that is, at the twilled part 3, as shown in reference photo 2, an intermediate alloy of aluminum alloy and stainless steel is formed to form a bond.

Here, when JIS-5083 is used as the material for the hollow aluminum alloy member 2 and JIS-SUS304 is used as the material for the stainless steel tube 1, the shear strength of the coin compartment and the water pressure at 750k9/ball are shown. Regarding the presence or absence of leakage, as shown in Fig. 2, welded an aluminum alloy tube 5 to an aluminum alloy tube 2 and a stainless steel tube 4 to a stainless steel tube 1, and cases in which a stainless steel tube 4 was welded and not welded. Table 1 shows the results of the test.

Table 1 As is clear from Table 1, it has sufficient bonding degree and airtightness, and even if welded as shown in Figure 2, the shear strength is equivalent to that without welding, and there is no leakage. Since there is no composite joint, especially when used as a welding joint,
The degree of bonding and airtightness will not be impaired by welding heat, etc.

Furthermore, when pipes made of the same type of metal are welded to both ends of a welding composite joint as shown in FIG. 2, the welded portion has a forged structure, which has good acid dissolution properties. In addition, in the above-mentioned welded composite joint, the part of the stainless steel pipe 1 that will become the pocket part can be made into a stepped shape, or this part can be tapered or threaded to improve the joint quality and airtightness. can further improve performance. Next, a method of manufacturing a composite joint as described above, particularly a composite joint for welding, will be explained with reference to FIG.

First, a pipe 1 made of stainless steel (JIS-SUS304) having a forged structure is placed in a vertical part 6 in a mold holder 7.
The core 6 attached to the mold holder 7 is installed so that the horizontal portion 6b closes the opening □ provided at the bottom of the mold holder 7. Next, the mold 10 is mounted on the mold holder 7 so that one end of the stainless steel tube 1 and one end of the vertical portion 6a of the core 6 are inside the mold 10. At this time, the mold 10 is heated to a temperature of 250 to 350 pm in order to minimize the temperature drop of the molten metal. Next, the plug mold 12 is fixed to the tip of the vertical portion 6a of the core 6, one end of which is inside the mold 10, by maintaining downward pressure with the hydraulic cylinder 8. Hollow aluminum alloy (JIS-508
3) Aluminum alloy (JIS-5
The molten metal 3) is injected into the inside of the mold 10. At this time, the temperature of the molten metal is 750 to 800°C, because if it is below 750°C, the temperature drop after Western-style bathing will be large, resulting in poor mirror adhesion, and if it is above 800°C, there will be problems such as oxidation of the molten metal. After floating and removing the oxides on the scratched surface, the punch mold 11 is lowered by the hydraulic cylinder 9 and 8 into the molten metal.
A pressure of 00 to 1000 k9/mm is applied, and solidification of the molten metal is completed under this pressure to form the hollow aluminum alloy member Z2, and the stainless steel tube 1 is inserted into the hollow aluminum alloy member Z2. Put money on member 2. At this time, the energy required for diffusion is not simply obtained from the heat capacity of the molten metal, but because pressure is applied to it to promote diffusion, the energy supply bond is achieved in an extremely short period of time Z, as shown in reference photo 2. Aluminum alloy (JIS-50
83) and stainless steel (JIS-SUS304)
By forming the intermediate alloy, it is possible to obtain a coin purse having sufficient bonding and airtightness as shown in Table 1 above. Therefore, even if the amount of molten metal is small and it is not possible to obtain sufficient diffusion energy for the heat capacity of the rising sun, as in the case of small products, it is easy to make coins by applying high pressure as described above. can be done. Moreover, the setting sun of aluminum alloy is 800~10002k9/
Since it is solidified under the pressure of the ground, the structure after solidification is fine and exhibits a so-called molten metal forging structure, and it is possible to obtain part A of a cast structure of a welding composite joint with excellent mechanical strength. After this, the plug mold 12 is
is raised to create an opening between a part of the upper part of the mold 10, that is, the vertical part 6a of the core 6, and the punch mold 11, and the hydraulic cylinder 9 lifts the punch molds 1 and 1.
is further lowered to apply pressure to the hollow aluminum alloy member 2, thereby causing a part of the hollow aluminum alloy material 2 to flow out from the entrance, thereby performing backward extrusion processing. With this processing,
As the punch die 11 descends, a part of the hollow aluminum alloy member having a cast structure is extruded to form a tubular part, and is plastically worked to have a cast structure.
The pressure required to perform this plastic working must be higher than the pressure used during hooking, and in principle, the pressure must be such that the coin purse does not peel off. In other words, the lowering of the punch die 1 1 must be stopped at a position where the coin purse part does not peel off in principle, but even if a part of the coin purse part peels off, sufficient bonding and airtightness should be maintained. In that case, there is no problem even if it is stopped at a part where a part of the coin part is peeled off.
When the forming of the rear joint for welding is completed as described above, the punch die 11 is raised by the hydraulic cylinder 9. At this time, the inner diameter of the punch mold 11 and the outer diameter of the extruded tubular part are the same diameter, but the latter has a lower temperature and the aluminum alloy has a higher heat exchange rate, so there is a large resistance. No. Rather, since the extruded tubular portion may be slightly curved, the ironing process has the effect of correcting the curve when the punch mold 11 is raised. Next, the horizontal portion 6b of the core 6 is raised by the hydraulic silitarder 13, and the core 6, the mold 10, and the welding composite joint as a product are extracted from the mold holder 7. After this, the product, the composite joint for welding, is taken out. 0 Since the present invention has been made as described above, it is possible to provide a composite joint that has extremely high reliability in joint degree and airtightness, and has excellent weldability, a method for manufacturing the same, and an apparatus for manufacturing the same. This is obvious, and for this reason, it is used in low-temperature vessels, ammonia type flat tank tanks, connection of refrigeration pipes in refrigerated vessels, joints for pipes in centrifugal separators, etc., and is extremely useful in industry.

Furthermore, the usefulness of the present invention is not necessarily limited to the above applications.

[Brief explanation of the drawing]

0 The drawings show one embodiment of the present invention, and FIG. 1 is a sectional view of the composite joint of the present invention, FIG. 2 is a diagram showing the state of the composite joint of the present invention and a pipe after welding, and FIG. Figure 3 is a cross-sectional view of the device of the present invention, where the left half from the center line shows a state in which pressure is applied to molten aluminum alloy, and the right half shows a state in which a hollow aluminum alloy material is extruded backwards. Reference photo 1 is a photo showing the macrostructure of the cross section of the composite joint of the present invention, and reference photo 2 is a photomicrograph 0 showing the microstructure of the coin purse part of the composite joint of the present invention. be. DESCRIPTION OF SYMBOLS 1... Stainless steel tube, 2... Hollow aluminum alloy member, 3... Money purse part, 4... Stainless steel tube, 5... Aluminum alloy tube, 6. ... Core, 6a... Vertical part of core, 6b...
・Horizontal part of core, 7... Mold holder, 8... Hydraulic cylinder, 9... Hydraulic cylinder, 10... Mold, 11... Punch mold, 12... Plug mold, 13...
・Hydraulic cylinder. Traditional illustration purple 2nd illustration 3rd sardine

Claims (1)

[Scope of Claims] 1. A first metal tube material having a forged structure is placed in a mold, and a molten metal forming a second metal tube material made of a metal different from the first metal tube material is poured into the metal mold. After pouring the molten metal into the mold and sealing the mold, pressure is applied to the molten metal, and solidification of the molten metal is completed under this pressure to form the second metal pipe material and the first metal pipe material. The second metal pipe is cast to the second metal pipe, and then a part of the mold is opened, and further pressure is applied to cause a part of the second metal pipe to flow out from the opening of the mold. 2. A method for manufacturing a composite joint, characterized by causing plastic deformation to the metal pipe material. 2 A metal tube with an open top for pouring the molten metal forming the second metal tube and an opening at the bottom so that one end of the first metal tube with a forged structure protrudes from the inside. a mold, the bottom opening of the mold is closed, and the first
The mold is characterized by comprising a core for supporting the metal pipe material, a plug mold and a punch mold that can be moved up and down to close the opening at the top of the mold and apply pressure inside the mold. Composite joint manufacturing equipment.