WO2009025487A2

WO2009025487A2 - Manufacturing of metal ring for pipe sealing and metal ring thereof

Info

Publication number: WO2009025487A2
Application number: PCT/KR2008/004826
Authority: WO
Inventors: Soo Hong Lee; Han Kyung Yun
Original assignee: Soo Hong Lee; Han Kyung Yun
Priority date: 2007-08-20
Filing date: 2008-08-20
Publication date: 2009-02-26
Also published as: WO2009025487A3; KR100854628B1

Abstract

The present invention relates to a method of manufacturing a metal ring for pipe connection and a metal ring formed by the method, and the object of the present invention is to provide a method of manufacturing a metal ring for pipe connection, in which method, at the time of production of the metal ring, the manufacturing is simple, separate facility is not required, and while a lot of metal rings can be manufactured in a short period, the crushing and the burr never cccur at all so that the quality is excellent and unoform, and the metal ring of a variety of shapes and sizes can be freely and selectively manufactured according to neccesity without any limitation of sectional shape, and the present invention proposes a method of manufacturing a metal ring for pipe connection and a metal ring formed by the method, which method, to manufacture a metal ring of appropriate size according to the usage of the metal ring, comprises a material selection process for selecting a steel wire which is a raw material, a coiling fabricating process for forming said steel wire into a circular shape by using a coiling machine so that said steel wire has an appropriate diameter, and a severing process for severing said steel wire, which was coiling fabricated, so as to manufacture a metal ring of a doughnut shape, wherein said processes are sequentially progressed.

Description

MANUFACTURING OF METAL RING FOR PIPE SEALING AND METAL RING THEREOF

Technical Field

[1] The present invention prevents water leakage or oil leakage by being inserted and pressed to a curved portion of a pipe connection part when connecting the pipes in longitudinal direction by using a press type connection pipe, and at the same time determines a drawing force of the pipe and the connection pipe.

[2] That is, when a rubber ring and a metal ring are inserted and pressed, the rubber ring prevents the water leakage/oil leakage and the metal ring determines the drawing force of the pipe and the connection pipe, and the present invention relates to a method of manufacturing a metal ring for pipe connection which makes it possible to manufacture the metal ring simply and easily. Background Art

[3] In general, when pipes made of metal such as stainless steel are connected in longitudinal direction, gas tightness of the connection part of the connection pipe is maintained by inserting the metal ring and the rubber ring to the connection part and pressing the metal ring and the rubber ring by a pressing tool.

[4] Referring to Fig. 1 showing a general structure for connecting the pipes by pressing the metal ring and the rubber ring, a pressing portion 21 which has a curved portion is formed at a forward end of a connection pipe 20 which adjoins an end of a pipe 10, and the rubber ring 41 and the metal ring 42 are respectively inserted into the pressing portion 21.

[5] In this situation, when the pressing portion 21 is pressed from the outter surface thereof to the center thereof by using a donut type press 30 to press the pressing portion 21, the pressing portion 21 is pressed and at the same time the metal ring 42 and the rubber ring 41 are pressed so as to securely contact the outter circumferential surface of the pipe 10, so that the gas tightness is maintained and at the same time the connection pipe 20 and the pipe 10 are rigidly combined.

[6] Here, the rubber ring 41 and the metal ring 42 can be selectively applied, and a number of them can be applied, and the manufacture of the rubber ring 41 is comparatively easy because it is manufactured by an injection molding which injects into a mold a liquid phase rubber raw material being usually melted, and vulcanizes it.

[7] To the contrary, since the material of the metal ring 42 cannot be injected due to its characteristics, to manufacture the metal ring 42 in a form of a doughnut, the metal ring 42 is generally formed by stamping work such as the press technique. In the stamping, under a condition where a metal sheet plate of a predetermined thickness is placed on a base, a press placed at the upper part strongly and rapidly strikes the metal sheet plate, and, at this time, a mold of a correspondig shape is attached at the botton of then press so that when the press strikes and severs the metal sheet plate, a ring in a form of a doughnut is formed, and the mold is generally manufactured from a metal of a material stronger than the matal sheet plate.

[8] However, when the metal ring is manufactured by the press technique, numerous probelms occur, and the problems are described with reference to Fig. 2.

[9] Fig. 2 shows both a sectional view and a top view of a metal ring for pipe connection manufactured by a conventional press technique. As described above, in the press technique, since the press momentarily strikes and severs the metal sheet plate, a crushing and a burr can easily occur.

[10] That is, as shown in Fig. 2, the strong pressure of the press induces the inner diameter and the outer diameter of the metal ring 42 to be unequal with each other, so called crushing, and in this case, as described in Fig. 1, when the crushed metal ring is pressed in the connection pipe 20, a scar is induced to the connection pipe and the pipe so that the durability is decreased and the air tightness with the pipe 10 is degraded so that the water leakage occurs.

[11] In addition, at the inner diameter part and the outer diameter part, fine burrs occur which are remained by inacurate severing due to some cause like a wear of the mold of the press, and the burr is sharp so as to cause damage to human at the time of uncareful handling, and not only the bur is difficult to remove due to the characteristics of the material thereof, but also when the metal ring 42 having the burr is pressed in the connection pipe 20, it can be a cause of degrade of the air tightness.

[12] In addition, the material of the press mold shall be a ultra hard metal so that the cost of manufacturing the mold is high, and when the metal ring is severed from the metal sheet plate, useless remainders such as scrap sheet plate are remained at the inner diameter part and the outer diameter part, and the remainders are difficult to retreat so as to cause a rise of cost of the metal ring, and furtheromre, various press molds have to be manufactured according to the number of various sizes of the metal ring so that the cost of manufacturing has to be high.

[13] The sectional shape of the metal ring is preferably circular in view of the fact that the metal ring is pressed in the connection pipe 20, however, it is difficult to manufacture a metal ring, the sectional shape of which is circular, due to the characteristics of the press technique. Disclosure of Invention Technical Problem [14] Therefore, the present invention is to solve various problems as described above, and the object of the present invention is to provide a method of manufacturing a metal ring for pipe connection, in which method, at the time of production of the metal ring, the manufacturing is simple, separate facility is not required, and while a lot of metal rings can be manufactured in a short period, the crushing and the burr never cccur at all so that the quality is excellent and unoform, and the metal ring of a variety of shapes and sizes can be freely and selectively manufactured according to neccesity without any limitation of sectional shape. Technical Solution

[15] As a solving means for achieving the object, the present invention, to manufacture a metal ring of appropriate size according to the usage of the metal ring, comprises a material selection process for selecting a steel wire which is a raw material, a coiling fabricating process for forming said steel wire into a circular shape by using a coiling machine so that said steel wire has an appropriate diameter, and a severing process for severing said steel wire, which was coiling fabricated, so as to manufacture a metal ring of a doughnut shape, wherein said processes are sequentially progressed.

[16] Here, a cut portion can be welded so that both ends of said cut portion can be connected to each other.

Advantageous Effects

[17] According to the present invention, there are advantages in that a mass production is possible as well as the manufacturing cost is reduced since the manufacture of the press is not necessary and the manufacturing process is simple, in that it is possible to cope with the requirements of the clients since the metal ring of a variety of shapes, for example, circular, rectangular, and lozenge shape, and a variety of sizes can be freely and selectively formed, and in that the productivity is greately improved over the conventional press techniques in which the replacement of the mold is required.

[18] Furthermore, the present invention has an effect that it can greately reduce an error rate such as water leakage and the like even if the metal ring is used in the pipe connection, since no error factors such as the crushing of the shape of the metal ring and the burr cccur at all so that the quality is excellent. Brief Description of the Drawings

[19] Fig. 1 is a sectional view for illustrating a general pipe connection structure,

[20] Fig. 2 is a sectional view and a top view of a metal ring for pipe connection manufactured by a conventional manufacturing method,

[21] Fig. 3 is a block diagram showing a manufacturing process of the metal ring for pipe connection according to the present invention,

[22] Fig. 4 shows a sectional view and a top view of the metal ring completed by a manu- facturing process according to the present invention,

[23] Fig. 5 shows a sectional view and a top view of the metal ring of other type completed by a manufacturing process according to the present invention,

[24] Fig. 6 is a sectional view showing a condition of use of the metal ring manufactured according to the present invention,

[25] Fig. 7 is a block diagram showing manufacturing process of the metal ring for pipe connection according to other embodiment of the present invention, and

[26] Fig. 8 is a top view of the metal ring completed by a manufacturing process according to other embodiment of the present invention. Mode for the Invention

[27] A detailed description of a preferred embodinent of the present invention and a man- ufactring method thereof will be given below with reference to the accompanying Figs. 3 and 5, wherein since the type of use of the metal ring for pipe connection of the present invenvtion is identical to the background description previously given through Fig. 1, the description thereof is omitted, and if a method or type publicly known or practiced among the ones described hereinafter or a present detailed description is judged to make the gist of the present invention obscure, a detailed description thereof shall be omitted.

[28] Fig. 3 is a block diagram showing a manufacturing process of the metal ring for pipe connection according to the present invention, Fig. 4 shows a sectional view and a top view of the metal ring completed by a manufacturing process according to the present invention, and Fig. 5 shows a sectional view and a top view of the metal ring of other type completed by a manufacturing process according to the present invention.

[29] The metal ring for pipe connection according to the present invention is manufactured using a coiling machine.

[30] For that purpose, first, an elogated steel wire is manufactured through a rolling process which elongates the metal material by pressing the metal material or a drawing/elongation process which elongates the metal material by drawing the metal material, and the steel wire can have various diameters, thicknesses, breadths, and sectional shapes according to the rolling process and the drawing/elongation process. For example, in case the section is circular, steel wires having desired diameters can be manufactured by adjusting the diameters to various dimensions, and in case the section is rectangular, steel wires having desired sectional shapes can be manufactured by freely adjusting the widths and the breadths.

[31] As shown in Fig. 3, the method of manufacturing a metal ring for pipe connection according to the present invention includes a material selection process S 1 for selecting a steel wire having a size and a sectional shape judged to be appropriate among the various steel wires. Here, at the time of material selection, the size, the thickness and the press ratio, etc. of the connection pipe to be applied later should be taken into consideration.

[32] In addition, the method of manufacturing a metal ring for pipe connection according to the present invention includes a coiling fabricating process S2 for forming the selected steel wire into a circular shape by winding the selected steel wire using the coiling machine.

[33] The coiling machine is a general machine for forming a coil spring by winding the steel wire, there is no necessity of manufacturing a special coiling machine to manufacture the metal ring for pipe connection according to the present invention, it is possible to select and use an already commercialized machine, and since the coiling machine can change the diameter of the coil according to a predetermined value set in the coiling machine itself, the coiling machine is appropriate to manufacturing the metal ring for pipe connection according to the present invention.

[34] Here, the coiling fabricating process S2 fabricatees a wire material available on the market to facilitate the winding of the steel wire into the cicular shape, and the manufacturing process includes, for example, a process of coiling a heat treated or non-heat treated wire, which is a raw material, at the room temperature, severing the wire, and removing a strain through a cold tempering process at the temperature of 160°C-280°C, however, the coiling fabricating process according to the present invention is not limited thereto but includes the case of using coiling machines of various kinds used in the relevant field.

[35] The steel wire fabricated in the coiling machine is wound into the shape of coil spring, and at this time, the method of manufacturing a metal ring for pipe connection according to the present invention includes a severing process S3 of severing at identical predetermined spacings the steel wire in the shape of coil spring into a circular shape, more specifically, a doughnut shape.

[36] From the steel wire subjected to the severing process S3, as shown in Fig. 4, the metal ring 42 of doughnut shape having an outer diameter and an inner diameter and formed with a cut portion 43 in its part is manufactured, and, in the severing process S3, a gap of the cut portion 43 can be adjusted in consideration of the pressing ratio at the time of pipe connection later.

[37] That is, as described with reference to Fig. 1, in case of making the pressing ratio in the connection pipe 20 large, the gap of the cut portion 43 is made narrow, and, to the contrary, in case of making the pressing ratio small, the gap of the cut portion 43 is made wide, so that when the metal ring 42 is pressed in the pressing portion 21 of the connection pipe 20, a phenomenon in which a spacing occurs inside of the cut portion 43 or both ends of the cut portion 43 abut to each other so that the pressing is not properly accompished can be prevented, and, as such, the gap of the cut portion 43 is in inverse proportional relation with the magnitude of the pressing ratio in the connection pipe.

[38] As shown in Fig. 4, the sectional shape of the metal ring 42 can be rectangular, and, in addition, it is possible to manufacture the metal ring 42 having the circular section, and the sectional shape of the metal ring 42 is decided according to which sectional shape of the steel wire is selected in the material selection process Sl. Of course, the present invention is not limited to the fact that the sectional shape of the metal ring 42 is circular shape or rectangular shape as shown, and it is possible to manufacture the metal ring 42 having a polygonal section such as a pentagonal or hexagonal shape according to the necessity.

[39] Of course, as shown in Fig. 6, the sectional shape of the metal ring is not limited to the square shape, and can be an atypical rectangular shape or polygonal shape.

[40] Fig. 7 is a block diagram showing manufacturing process of the metal ring for pipe connection according to other embodiment of the present invention, and Fig. 8 is a top view of the metal ring completed by a manufacturing process according to other embodiment of the present invention, and the welding W is performed at the cut portion 43 so that both ends of the cut portion 43 are fixed to each other, so that the metal ring 42 has a complete ring shape.

[41] For that purpose, in the present invention, as described above, the material selection process Sl for selectiong the steel wire which is a raw material, the coiling fabricating process S2 for forming the steel wire into a circular shape by using the coiling machine, and the severing process S3 for severing the steel wire, which was coiling fabricated, into the doughnut shape are perfomed, and thereafter, a cut portion welding process S3' for welding W the cut portion 43 so that both ends of the cut portion 43 are fixed to each other is performed, and then an inspection process S4 for inspecting an error in the dimension or the welded portion and the like is performed.

[42] The cut portion welding process S3' is performed through an already widely known general welding process, so a detailed description thereof is omitted.

[43] The description given above is based on the accompanying drawings, however, anyone familiar with the field of the present invention can modify or change in various ways with reference to the description given above, and it is appreciated that such changes are identical with or equivalent to the technical thought of the present invention so as to be within the scope of the claims of the present invention.

Claims

[1] A method of manufacturing a metal ring for pipe connection, comprising; a material selection process S 1 for selecting a steel wire which is a raw material, a coiling fabricating process S2 for forming said steel wire into a circular shape by using a coiling machine, and a severing process S3 for severing said steel wire, which was coiling fabricated, into a doughnut shape, wherein, in said severing process S3, a gap of a cut portion 43 is adjusted according to a pressing ratio at the time of pipe connection in such a way that said gap of said cut portion 43 is in inverse proportional relation with the magnitude of said pressing ratio so as to be smaller as said pressing ratio becomes larger. [2] The method of manufacturing a metal ring for pipe connection according to claim 1, further comprising a cut portion welding process S3' for connecting both ends of said cut portion through a welding work of said cut portion. [3] A metal ring for pipe connection manufactured by said method of manufacturing described in claim 1, wherein; said metal ring has said doughnut shape having an outer diameter and an inner diameter, and in said metal ring, said cut portion 43 is formed by cutting a part of said metal ring. [4] The metal ring for pipe connection according to claim 3, wherein the sectional shape of said steel wire is a circular or polygonal shape. [5] The metal ring for pipe connection according to claim 3 or 4, wherein both ends of said cut portion 43 are connected to each other by performing a welding work

W to said cut portion 43.