KR101211631B1 - Manufacturing Technology and Forming Tool for Fabricating a Metallic Bellows - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for producing a metal corrugated pipe, and a method for manufacturing a metal corrugated pipe by laminating a plurality of metal thin plates, and a manufacturing apparatus used therefor.
The present invention relates to a method for manufacturing a metal corrugated pipe by laminating a plurality of ring-shaped metal sheets up and down, and selecting an inner diameter joining portion and an outer diameter joining portion to be joined up and down in a ring-shaped metal sheet, and in the metal sheet, Laminating a plurality of metal thin plates in a state in which a release agent (stop-off) is applied to a portion other than the inner diameter joint portion and the outer diameter joint portion, and diffusion bonding at a high temperature while pressing up and down while the plurality of metal thin plates are laminated. Manufacture of the corrugated pipe including the steps of joining the inner diameter and the outer diameter of the plurality of metal thin plates up and down and applying a vertical tension force to the plurality of metal thin plates to be completed to separate the parts other than the inner diameter and the outer diameter of the joint. Provide a method.

Description

Manufacturing method and apparatus for manufacturing corrugated pipes {Manufacturing Technology and Forming Tool for Fabricating a Metallic Bellows}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for producing a metal corrugated pipe, and a method for manufacturing a metal corrugated pipe by laminating a plurality of metal thin plates, and a manufacturing apparatus used therefor.

Metal corrugated pipes are used in various fields, and in various fields, they are used for preventing the penetration of foreign substances into the joints and controlling the amount of deformation caused by shock absorption and absorption, thermal expansion and contraction.

Metal corrugated pipe is divided into U type and welded type. U type is made of mold, and the shape of mountain and valley is formed with a constant curvature of U shape, and the welding type has a bent or curved shape. U-type corrugated pipe may be damaged by bumping mountains when making a structure with many bends, high defect rate of parts, and manufacturing difficulties. In addition, the welded corrugated pipe has a manufacturing disadvantage in that all of the corrugated wrinkles are welded. As a result, productivity is low, manufacturing costs are increased, and manufacturing time is long.

In addition, in producing other kinds of corrugated pipes, a mold apparatus must be separately provided. As a result, the manufacturing cost rises, and when manufacturing other products, the entire mold needs to be replaced, and production time increases.

The present invention has been devised to solve the problems of the conventional metal corrugated pipe manufacturing described above. The reliability is further improved by a simple process using diffusion bonding, which is different from the metal corrugated pipe manufacturing method, which is difficult to obtain reliability through many existing processes. This facilitates the production of different types of metal tubes and shortens the production time. In addition, the titanium alloy, nickel alloy, and steel alloy, which were difficult to manufacture by the conventional process, can be easily formed through diffusion bonding to reduce the weight of the corrugated pipe and reduce the material cost.

The present invention relates to a method for manufacturing a metal corrugated pipe by laminating a plurality of ring-shaped metal thin plates (1) up and down, wherein the inner diameter joining portion (2) and the outer diameter joining portion (2) to be joined up and down in the ring-shaped metal thin plate (1) 3) selecting, and laminating a plurality of metal thin plates (1) in a state in which a release agent (stop-off) is applied to a portion other than the inner diameter bonding portion 2 and the outer diameter bonding portion (3) in the metal thin plate (1) And, the inner diameter joining portion 2 and the outer diameter joining portion (2) of the plurality of metal thin plates (1) by diffusion welding at a high temperature while pressing up and down in a state where a plurality of the metal thin plates (1) are laminated Bonding 3) up and down; It provides a metal corrugated pipe manufacturing method comprising a; and apart from the inner diameter joint portion 2 and the outer diameter joint portion 3 by applying a tensile force up and down to the plurality of metal thin plates (1) completed bonding.

Here, the thin metal plate 1 is characterized in that the use of chemical cleaning or mechanical polishing is completed.

In addition, the release agent is characterized in that the aluminum nitride (ALN) or boron nitride (BN).

In addition, in the vertical bonding step of the thin metal plate, the atmosphere of the vertical bonding is characterized in that the vertical pressing force is 4 ~ 7MPa, the temperature is 700 ℃ or more.

In addition, the metal thin plate 1 is characterized in that any one of titanium alloys, nickel alloys and steel alloys.

In addition, the vertical bonding step is characterized in that the oxidation-resistant gas is filled, or the inside is carried out in a closed space that is a vacuum.

In addition, the present invention relates to a mechanism for manufacturing a metal corrugated pipe by stacking a plurality of ring-shaped thin metal plate (1) up and down, a cylindrical housing 10 of which the bottom is sealed and the hollow inside; and the housing ( Cover 10 for closing the top of the 10; And, pressing jig 30 for pressing the plurality of metal thin plates (1) provided in the cover 20 to be stacked therein; And a gas inlet and outlet 40 provided in at least one of the housing 10 or the cover 20 to inject or discharge gas into the housing 10.

Here, the pressure jig 30 is characterized by inflating the adjacent metal thin plate 1 by swelling in a ring shape by the injection of gas.

In addition, the pressing jig 30, the outer and inner diameter of the ring-shaped upper metal plate 31 and the lower metal plate 32 are coupled to each other in the state bonded to each other; and the upper and lower metal thin plates 31, 32 It is characterized in that it comprises a; gas inlet 33 for injecting gas into.

Using the present invention,

By using diffusion bonding, the final product can be manufactured without undergoing many stages of manufacturing processing, and metal materials (titanium, nickel alloy, etc.) that are difficult to process can be easily manufactured by using diffusion bonding. Through this, the reliability of the manufactured metal corrugated pipe can be increased, and it can be manufactured with titanium, nickel alloy, etc., thereby reducing the weight and cost of the metal corrugated pipe.

In addition, the existing manufacturing method in the production of different types of metal corrugated pipe can be made by re-molding the mold apparatus separately or by welding, the present invention can be produced by laminating metal sheets of different sizes. . This can reduce the production time and production costs.

In addition, by using a pressure mechanism to deliver a uniform pressure to the hollow metal sheet to optimize the diffusion bonding, it is possible to obtain the effect of correcting the difference in the thickness between the stop-off and the non-applied portion. And it can be delivered through the pressurization mechanism by the method of pressurizing the jig, so it is not necessary to use other hydraulic mechanisms and presses, etc., thus reducing the production cost.

1 is a flow chart of a metal corrugated pipe manufacturing method according to the present invention,
2 is a cross-sectional view showing a shape for producing a metal corrugated pipe using the metal corrugated pipe manufacturing apparatus according to the present invention,
3 is a cross-sectional view of a metal corrugated pipe completed according to the present invention,
Figure 4 is a perspective view of the pressure jig used in the apparatus for producing metal corrugated pipe according to the present invention,
5 is a perspective view of a metal corrugated pipe completed by the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in this specification and claims should not be construed in a common or dictionary sense, and the inventors will be required to properly define the concepts of terms in order to best describe their invention. Based on the principle that it can, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, at the time of the present application, It should be understood that there may be water and variations.

1 is a flow chart of a metal corrugated pipe manufacturing method according to the invention, Figure 2 is a cross-sectional view showing a shape for producing a metal corrugated pipe using a metal corrugated pipe manufacturing apparatus according to the present invention, Figure 3 is a metal completed in accordance with the present invention It is sectional drawing of a corrugated pipe, FIG. 4 is a perspective view of the press fixture used for the metal corrugated pipe manufacturing apparatus which concerns on this invention, FIG. 5 is a perspective view of the metal corrugated pipe completed by this invention.

As shown in Figures 1 to 4, in the manufacture of metal bellows (bellows) according to the present invention, by manufacturing a metal corrugated pipe by laminating a plurality of ring-shaped metal thin plate (1) up and down, selecting the inner diameter joint and the outer diameter joint It includes a step, lamination of the metal thin plate, metal sheet up and down joining step, metal corrugated pipe completion step.

Here, the metal thin plate 1 is preferably used that is chemical cleaning or mechanical polishing is complete.

The inner diameter joining portion and the outer diameter joining portion selection step is to select the inner diameter joining portion 2 and the outer diameter joining portion 3 to be joined up and down in the ring-shaped metal sheet (1). Since the present invention is to complete the manufacture of the metal corrugated pipe by joining the inner and outer diameters in a zigzag by joining the metal thin plate (1) up and down (see Fig. 3), the inner diameter to be joined after the ring-shaped metal thin plate (1) is laminated The joint 2 and the outer diameter joint 3 should be selected.

Next, in the lamination of the thin metal sheet, a plurality of thin metal sheets 1 are laminated in a state in which a release agent is applied to a portion other than the inner diameter bonding portion 2 and the outer diameter bonding portion 3 in the thin metal sheet 1. Step. In the present invention, since the inner diameter bonding portion 2 and the outer diameter bonding portion 3 of the metal thin plate 1 laminated by diffusion welding are bonded, they do not correspond to the inner diameter bonding portion 2 and the outer diameter bonding portion 3. The part is to apply a release agent in advance so that the bonding is not made. In the present invention, the release agent may use aluminum nitride (ALN), boron nitride (BN) powder and the like.

In addition, the metal thin plate up and down bonding step is the inner diameter joint portion 2 of the plurality of metal thin plates 1 by diffusion welding at a high temperature while pressing up and down in a state where a plurality of the metal thin plates 1 are stacked. It is the step of joining the outer diameter joining part 3 up and down. That is, by forming an atmosphere of a predetermined vertical junction to facilitate the diffusion bonding. The metal sheet 1 is made of any one of a titanium alloy, nickel alloy and steel alloy, the atmosphere of the up and down joint is an up and down pressing pressure of 4 ~ 7MPa, the temperature is 700 ℃ or more, the oxidation-resistant gas is filled or inside The bonding can be made in a closed space where is vacuum. Moreover, as for high temperature holding time, 30 to 120 minutes are preferable.

In addition, the completion of the metal corrugated pipe is a step of applying a vertical tensile force to the plurality of metal thin plates 1 to which the bonding is completed to separate portions other than the inner diameter bonding portion 2 and the outer diameter bonding portion 3. That is, the plurality of metal thin plates 1 pressed in the state where the bonding is completed is pulled up and down to form a metal corrugated pipe shape.

In addition, the present invention also provides a metal corrugated pipe manufacturing apparatus, which is designed to facilitate the production of the metal corrugated pipe described above.

That is, as shown in Figure 2, the metal corrugated pipe manufacturing apparatus according to the present invention relates to a mechanism for manufacturing a metal corrugated pipe by laminating a plurality of ring-shaped thin metal plate (1) up and down, the housing 10, the cover 20 ), The joining jig 30, and the gas inlet and outlet 40 is configured.

The housing 10 is a cylindrical shape having a lower end and a hollow inside, and a ring-shaped metal thin plate 1 is stacked therein.

The cover 20 is a member that closes the upper end of the housing 10, and tightly closes the housing 10 so that gas may be filled in the housing 10 or maintain a vacuum state. 20) should be able to be firmly fixed so as not to move even under the pressure applied from the pressure jig (30) provided in.

The pressing jig 30 corresponds to a configuration for pressing the plurality of metal thin plates 1 provided in the cover 20 and stacked therein. In the present invention, the pressure jig 30 is inflated in a ring shape by the injection of an inert gas to apply pressure to the metal thin plate 1 to optimize the diffusion bonding, The thickness of the metal corrugated pipe produced is made uniform.

As shown in FIG. 4, the pressure jig 30 has a ring-shaped upper metal thin plate 31 and lower metal thin plate 32 and the upper and lower metal thin plates 31 which are coupled up and down in a state where the outer diameter and the inner diameter are joined to each other. It is configured to include a gas inlet 33 for injecting gas into the 32, it can be utilized if the upper metal plate 31 and the lower metal plate 32 can be inflated by the injection of inert gas. Here, the metal thin plates 31 and 32 of the pressing jig 30 may be made of titanium alloy, nickel alloy, or the like, and may be resistance welding, arc welding, plasma welding, or the like as the joining (welding) method.

The gas inlet and outlet 40 is provided in at least one of the housing 10 or the cover 20 to inject or discharge gas into the housing 10. The gas inlet and outlet 40 is configured to inject an oxidizing gas into the interior of the housing 10 or to discharge air to make the interior into a vacuum when the cover 20 is assembled to the housing 10. Here, when the assembly of the housing 10 and the cover 20 is completed, the inside of the housing 10 should be kept in a sealed state. When the airtightness of the pressure jig 30 is confirmed, the entire pressure jig 30 is put into a high temperature furnace and heating is started to a temperature at which diffusion bonding can be optimized, and an inert gas is injected into the pressure jig 30 to be a molding target. The metal thin plate 31 is pressed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood that various changes and modifications may be made without departing from the scope of the appended claims.

1: metal lamination
2: inner diameter joint
3: outer diameter joint
5: metal corrugated pipe
10: Housing
20: Cover
30: pressure jig
31: upper metal sheet
32: lower metal sheet
33: gas inlet for pressurization
40: gas inlet and outlet for anti-oxidation atmosphere
100: metal corrugated pipe manufacturing device

Claims (9)

As a method for manufacturing a metal corrugated pipe by laminating a plurality of ring-shaped metal thin plate (1) up and down,
Selecting an inner diameter joining portion 2 and an outer diameter joining portion 3 to be joined up and down in the ring-shaped metal sheet 1;
Stacking a plurality of metal thin plates (1) in a state in which a release agent (stop-off) is applied to a portion of the metal thin plate (1) other than the inner diameter bonding portion (2) and the outer diameter bonding portion (3);
The inner diameter joining portion 2 and the outer diameter joining portion 3 of the plurality of metal thin plates 1 are up and down by diffusion welding at a high temperature while pressing up and down in a state where a plurality of the metal thin plates 1 are stacked. Splicing;
Applying a vertical tension to the plurality of metal thin plates (1) of the bonding is completed, the step of separating the parts other than the inner diameter joint portion (2) and the outer diameter joint portion (3); metal corrugated pipe manufacturing method comprising a. The method of claim 1,
The metal thin plate (1) is a metal corrugated pipe manufacturing method, characterized in that the use of chemical cleaning or mechanical polishing is completed. The method of claim 1,
The release agent is a metal corrugated pipe manufacturing method, characterized in that the aluminum nitride (ALN) or boron nitride (BN). According to claim 1, In the vertical bonding step of the thin metal plate,
The atmosphere of the up-and-down joint is a method of producing a corrugated pipe, characterized in that the up and down pressing force is 4 ~ 7MPa, the temperature is 700 ℃ or more. The method of claim 1,
The metal thin plate (1) is a metal corrugated pipe manufacturing method, characterized in that any one of titanium alloys, nickel alloys and steel alloys. The method of claim 1, wherein the vertical bonding step,
Method for producing a metal corrugated pipe, characterized in that the oxidation-resistant gas is filled, or proceeds in a closed space inside the vacuum. The present invention relates to a mechanism for manufacturing a metal corrugated pipe by laminating a plurality of ring-shaped metal thin plates (1) up and down,
A cylindrical housing 10 having a lower end and a hollow inside;
A cover 20 closing an upper end of the housing 10;
Pressurized to press the plurality of metal thin plates 1 which are provided in the cover 20 and laminated in a state where a release agent is applied to portions other than the inner diameter contact portion 2 and the outer diameter contact portion 3 to be joined up and down therein. Jig (30);
And a gas inlet and outlet (40) provided in at least one of the housing (10) and the cover (20) to inject or discharge gas into the housing (10). The method of claim 7, wherein the pressure jig 30,
An apparatus for producing a metal corrugated pipe, which is inflated in a ring shape by injection of gas to press adjacent metal thin plates (1). The method of claim 7, wherein the pressure jig 30,
A ring-shaped upper metal thin plate 31 and a lower metal thin plate 32 which are coupled up and down in a state where the outer diameter and the inner diameter are joined to each other; and
And a gas inlet (33) for injecting gas into the upper and lower metal thin plates (31, 32).

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