KR101638749B1 - Method for manufacturing elbow used in connecting high pressure pipe - Google Patents

Method for manufacturing elbow used in connecting high pressure pipe Download PDF

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Publication number
KR101638749B1
KR101638749B1 KR1020150170383A KR20150170383A KR101638749B1 KR 101638749 B1 KR101638749 B1 KR 101638749B1 KR 1020150170383 A KR1020150170383 A KR 1020150170383A KR 20150170383 A KR20150170383 A KR 20150170383A KR 101638749 B1 KR101638749 B1 KR 101638749B1
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KR
South Korea
Prior art keywords
bending
elbow
press
elbow material
mold
Prior art date
Application number
KR1020150170383A
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Korean (ko)
Inventor
이광섭
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이광섭
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Priority to KR1020150170383A priority Critical patent/KR101638749B1/en
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Publication of KR101638749B1 publication Critical patent/KR101638749B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/04—Stamping using rigid devices or tools for dimpling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/06—Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B5/00—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
    • B23B5/36—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning specially-shaped surfaces by making use of relative movement of the tool and work produced by geometrical mechanisms, i.e. forming-lathes
    • B23B5/46—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning specially-shaped surfaces by making use of relative movement of the tool and work produced by geometrical mechanisms, i.e. forming-lathes for turning helical or spiral surfaces
    • B23B5/48—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning specially-shaped surfaces by making use of relative movement of the tool and work produced by geometrical mechanisms, i.e. forming-lathes for turning helical or spiral surfaces for cutting grooves, e.g. oil grooves of helicoidal shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P13/00—Making metal objects by operations essentially involving machining but not covered by a single other subclass
    • B23P13/02—Making metal objects by operations essentially involving machining but not covered by a single other subclass in which only the machining operations are important
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P17/00—Metal-working operations, not covered by a single other subclass or another group in this subclass
    • B23P17/02—Single metal-working processes; Machines or apparatus therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L43/00—Bends; Siphons
    • F16L43/001—Bends; Siphons made of metal

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Abstract

The present invention relates to a method to manufacture an elbow for connecting a high pressure pipe in which a groove to insert a tool can be formed. The method allows a simple manufacturing process with improved productivity and reduced cost using a bending method, without deformation of an elbow material and without reduced flow path on a cross-sectional part to ensure a smooth flow of fluid. According to the present invention, the method comprises: a step of preparing elbow material to cut a long pipe material to correspond to the length of the elbow; a step of bending pressing to bend the elbow material at a right angle by a bending press mold; a compression step of compressing the elbow material by a compression press mold, to form a groove for a tool vertically on a bent portion of the elbow material; and a step of forming threads to respectively process threads on both ends of the elbow material.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an elbow for connecting a high-

The present invention relates to a method of manufacturing an elbow for connecting a high-pressure pipe.

In general, pipe bends are pipe joints used to connect to a position that changes the flow direction of a fluid such as liquid or gas flowing inside the pipe. This curved tube is called 'elbow', meaning 'tube bent in the shape of an elbow' in a dictionary meaning.

The elbow for connecting a high-pressure pipe according to the related art is used by connecting the elbow body 10 to the pipe block 30 with a fastening nut 20 as shown in Fig. A thread 11 is formed at both ends of the elbow main body 10 and one screw is screwed to the piping block 30 to be coupled to the clamping nut 20 while the other screw is connected to a high pressure piping (not shown) . The bent portion of the elbow body 10 is formed with a flat surface portion 12 to be inserted into a tool such as a spanner in order to be coupled to the piping block 30. [

2, the flow paths 10a and 10b at both ends intersect at right angles to connect the elbow body 10 to connect the high-pressure pipes and to process the threads 11 at both ends, Should be thick.

In order to manufacture an elbow for connecting a high-pressure pipe according to the related art, a thick metal plate is cut out, and then an elbow material is formed in a right angle, and the channels 10a and 10b crossed at right angles by drilling from both sides of the material, And the thread 11 is machined at both ends.

However, in the above-described conventional method for manufacturing an elbow for connecting a high-pressure pipe, since the first thick metal plate is cut in a right angle shape in accordance with its size and then drilling is required twice, the machining process becomes complicated, It is necessary that a separate step for removing such scratches is required in the intersection 10c of the flow paths 10a and 10b due to drilling and it takes a lot of time to remove the scratches, Since the intersecting portion 10c of the fluid passage 10b forms a right angle, it interferes with smooth fluid transfer. Third, since there are many cutting and cutting processes, there is a problem that the material is wasted so that the productivity is lowered and the production cost is increased.

Meanwhile, the bending process may be performed using a jig or a metal mold in a different method of manufacturing an elbow for connecting a high-pressure pipe according to the related art. At this time, the elbow body 10 may be bent or may be bent at the intersection of the channels 10a and 10b 10c are thinned, a problem of smooth fluid transfer occurs, and in particular, there is a problem that it is not possible to form a flat surface portion 12 into which a tool-like circular circular cross-section can be inserted.

It is an object of the present invention, which has been devised to solve the above-mentioned problems, to provide a high-pressure pipe connecting elbow for bending a pipe, which simplifies a manufacturing process and improves productivity and production cost, The present invention provides a method of manufacturing an elbow for connecting a high-pressure pipe, which is capable of securing a smooth fluid flow without additional contraction and of forming a tool groove into which a tool is inserted.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

According to another aspect of the present invention, there is provided a method of manufacturing an elbow for connecting a high-pressure pipe, comprising the steps of preparing an elbow material by cutting an elongated pipe material according to a length of the elbow to be manufactured, A bending press step of bending the bent elbows to be bent at a right angle by a bending press die, a step of press-bonding the bended elbow material with a press-forming press mold so as to form upper and lower tool grooves in the upper and lower bent portions of the elbow material, And a thread forming step of machining the threads at both ends of the material.

The elbow material preparing step may include a pipe material drawing step of producing the pipe material by drawing processing, and an elbow material cutting step of cutting the pipe material into an elbow material having a predetermined length.

The bending press mold includes a bending lower mold having a bent seating portion recessed downward at the center thereof, and a lower bending lower mold that is installed so as to be able to move up and down above the lower bending mold, Wherein the bending press step includes an elbow material placing step in which both ends of the elbow material are held at both ends of the bending seating part of the bending lower mold; And an elbow material bending step in which the bending work is performed by bending the elbow material while being bent toward the mold so as to be fitted to the bending seat of the bending lower mold.

Further, the press-press die includes a press-fit lower mold having protrusions protruded when the bent bending elbow material is fixed in a horizontal state and pressed so as to contact the lower surface of the bent portion of the fixed elbow material; And a press-fit upper mold provided so as to be vertically movable up and down, wherein the press-fit upper surface protrusion is protruded so as to face the protrusion so as to contact the upper surface of the bent portion of the elbow material upon descending, Wherein the elbow material is fixed to the press-down lower mold in a horizontal state so that the elbow material is brought into contact with the protrusion when the press-down lower mold is pressed, and a lower step of lowering the upper press mold toward the press- A protrusion presses the upper surface of the bent portion of the elbow material, and when the pressing is performed, the protrusion presses the lower surface of the bent portion of the elbow material While complex is characterized in that it comprises a tooling groove forming step of the recessed groove to the upper and lower tooling to form the bending part of the elbow material.

Further, the pipe material is manufactured by drawing and forming to have an outer diameter of 16 mm and an inner diameter of 5 mm.

In the bending press mold, the bending seating portion of the bending lower mold is recessed downward at an angle of 88 degrees, the recessed edge is rounded to a radius of 23 mm (R23), and the bending upper mold is bent at an angle of 85 degrees And the protruding edge is rounded to a radius of 7 mm (R7).

In addition, the above-mentioned elbow material groove is formed to be recessed in the upper and lower portions to a depth of 1 to 2 mm, respectively.

The method for manufacturing an elbow for connecting a high-pressure pipe according to the present invention is characterized in that an elbow for connecting a high-pressure pipe is manufactured by bending to simplify a processing process, It is possible to secure a smooth fluid flow and to form a groove of the tool hole into which the tool is inserted, thereby facilitating assembly and disassembly.

1 is a side view showing a state in which a high-pressure pipe connecting elbow according to a related art is installed in a pipe block,
2 is a cross-sectional view of a high-pressure pipe connecting elbow in the embodiment of FIG. 1,
3 is a flowchart showing a first embodiment of a method for manufacturing an elbow for connecting a high-pressure pipe according to the present invention,
4 is a flowchart showing a second embodiment of a method for manufacturing an elbow for connecting a high-pressure pipe according to the present invention,
FIG. 5 is an explanatory view showing a processing procedure of the elbow material preparing step of the embodiment of FIGS. 3 and 4,
FIG. 6 is a cross-sectional view showing a pipe material manufactured according to the embodiment of FIG. 5,
7 is a flowchart showing a third embodiment of a method for manufacturing an elbow for connecting a high-pressure pipe according to the present invention,
FIG. 8 is an explanatory view showing a machining process of a bending press step in the embodiments of FIGS. 3 and 7,
FIG. 9 is a perspective view schematically showing a bending press die used in the bending press step in the embodiment of FIGS. 3 and 7,
FIGS. 10 and 11 are perspective views illustrating a bending press process according to the embodiment of FIG. 9,
FIG. 12 is a view showing a bending-pressed elbow material and a projection sectional view in the process of bending press step through the embodiment of FIG. 8,
13 is a flowchart showing a fourth embodiment of a method for manufacturing an elbow for connecting a high-pressure pipe according to the present invention,
FIG. 14 is an explanatory view showing a process of a press-pressing step in the embodiment of FIGS. 3 and 13,
FIG. 15 is a view showing a compression-pressed elbow material and a projection sectional view in the process of press-pressing step through the embodiment of FIG. 14,
16 is a perspective view of the embodiment of Fig. 15,
17 is a side view of the elbow fabricated through the thread forming steps of the embodiments of Figs. 3, 4, 7 and 13,
18 is a cross-sectional view of the embodiment of Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a method of manufacturing an elbow for connecting a high-pressure pipe according to the present invention will be described in detail with reference to the accompanying drawings.

The method for manufacturing an elbow for connecting a high-pressure pipe according to the present invention includes an elbow material preparing step (S100), a bending press step (S200), a pressing press step (S300) and a thread forming step (S400) . The elbow material preparation step S100 includes a pipe material drawing step S110 and an elbow material cutting step S120 as shown in FIG. 4, and the bending press step S200 is a step The elbow material fixing step S210 and the elbow material bending step S220 include the elbow material fixing step S310 and the tool groove forming step S320 as shown in FIG. ).

As shown in FIGS. 3 to 5, the long elongated pipe material 100 is prepared according to the length of the elbow 200 to prepare the elbow material 110. More specifically, the elbow preparation step S100 includes a pipe material drawing step S110 for producing the pipe material 100 by drawing, a cutting step S110 for cutting the pipe material 100 with an elbow material 110 having a predetermined length, (S120). ≪ / RTI > Although not shown in the drawing, the elongated pipe material 100 is manufactured by drawing a material by pulling the material through a die having a tapered hole and drawing the pipe material 100 to a plurality of elbow materials (110) to prepare an elbow material (110). As shown in FIG. 6, the pipe material 100 may be manufactured to have an outer diameter of 16 mm and an inner diameter of 5 mm by a draw-forming method for use in connecting high-pressure pipes.

The bending press step (S200) bends the elbow material (110) at right angles by the bending press mold (300) as shown in FIGS. 8 and 9, the bending press mold 300 used in the bending press step S200 includes a bending lower mold 311 having a bent seating part 311 recessed downward at the center thereof, And a bending upper mold 320 provided on the bending lower mold 310 so as to be able to move up and down and having a bending protrusion 321 protruding downward in a round fashion so as to be fitted to the bending lower mold 310, . 8 to 11, the bending press step S200 is a step in which the both ends of the elbow material 110 are held at both ends of the bending seating part 311 of the bending lower metal mold 310, The bending lower mold 310 is lowered toward the bending lower mold 310 so that the bending lowering mold 321 bends the elbow material 110 while the bending lower mold 310 is bent, (Step S220).

12, the elbow material 110 bent through the bending press step S200 has a rectangular shape. However, considering the springback phenomenon during metal working, The bending seating portion 311 of the bending lower mold 310 is depressed downward at an angle of 88 degrees and the recessed edge is rounded to a radius of 23 mm R23, The bent protrusion 321 of the protrusion 321 protrudes downward at an angle of 85 degrees and the protruding edge is rounded to a radius of 7 mm (R7). Thus, when the elbow material 110 is bent by the bending press mold 300, it is processed to be smaller than the angle of 90 degrees, and then bent by 90 degrees by the springback phenomenon. 12, the bending portion 111 has an elliptical shape having an outer diameter and an inner diameter that are long in the vertical direction, so that the fluid flowing through the inner diameter is in the form of Bottlenecks can occur.

The elliptical shape of the inner diameter generated in the bent portion 111 of the bent elbow material 110 can be made to be a circular shape like the both ends to prevent the bottleneck phenomenon and the tool hole can be inserted into the cylindrical elbow material 110 A compression pressing step S300 to be described later is performed in order to form the tool groove 112.

That is, in the pressing press step S300, as shown in FIGS. 13 to 15, the bent elbow material 110 is pressed by the press-forming press mold 400 to be bent to the bent portion 111 of the elbow material 110 The upper and lower tool grooves 112 are recessed. Specifically, the compression press die 400 used in the press-pressing step S300 fixes the bent elbow material 110 in a horizontal state as shown in FIG. 14, and the fixed elbow material 110 The lower mold 410 is provided with a protrusion 411 protruding therefrom so as to be brought into contact with the lower surface of the bending portion 111 of the bending portion 111 of the bending portion 111. When the bending portion 111 is lowered, And a pressing upper mold 420 having a pressing upper surface protrusion 421 protruded to face the upper surface of the bent portion 111 of the work 110 so as to face the projection 411 when the pressing is performed. Accordingly, the compression pressing step S300 is performed such that the lower surface of the bent portion 111 of the elbow material 110 is brought into contact with the protrusion 411 when the compression lower mold 410 is compressed as shown in FIGS. 14 to 16 An elbow material fixing step S310 in which the elbow material 110 is fixed to the press-down lower mold 410 in a horizontal state and the elbow material fixing step S310 in which the press-up upper mold 420 is lowered toward the press- The upper surface protrusion 421 presses the upper surface of the bent portion 111 of the elbow material 110 and the protrusion 411 presses the lower surface of the bent portion 111 of the elbow material 110, (S320) for forming a recessed portion (112) in the upper and lower portions of the bent portion (111) of the recessed portion (110).

As shown in FIG. 15, in the upper and lower surfaces of the bending portion 111, the orifice groove 112 is formed in the elbow material 110 so that the orbital groove 112 is recessed through the compression pressing step S300 And presses the bent portion 111 of the elbow material 110 up and down. Accordingly, the cross-sectional shape of the bent portion 111 of the squeezed elbow material 110 is such that the elliptical shape elongated vertically at the time of bending as shown in Fig. Accordingly, as shown in FIG. 18, the inner diameter channel of the elbow 200 to be finally manufactured is rounded from the one end to the other end through the bending portion 111 with the same diameter, so that the flow of the fluid can be smooth . Since the tool groove 112 is formed on the upper and lower surfaces of the bend 111 together with the bending portion 111 of the cylindrical elbow material 110, a planar portion such as a spanner can be inserted, It is easy to assemble and disassemble. At this time, the tool groove 112 of the elbow material 110 may be recessed to a depth of 1 to 2 mm in the vertical direction.

Finally, in the thread forming step S400, threads 113 are formed on both ends of the elbow material 110, as shown in Figs. 3 and 17. The thread 113 is machined by a general lathe. When the thread 113 is machined on the elbow material 110 on which the bending press stage S200 and the press-press stage S300 have been performed, the final high- 200 is completed.

As described above, the method for manufacturing an elbow for connecting a high-pressure pipe according to the present invention is a method for manufacturing an elbow 200 for connecting a high-pressure pipe by bending, simplifying a processing process, And the crossing portion of the flow path is not reduced, smooth fluid flow is ensured and the tool groove 113 into which the tool is inserted can be formed, which facilitates assembly and disassembly.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

100: Pipe material
110: Elbow material 111: Bend
112: tool groove 113: threaded
200: Elbow
300: Bending Press Mold
310: Bending lower mold 311: Bending seat
320: upper bending metal mold 321:
400: Crimping press mold
410: Crimped lower mold 411: When pressed,
420: upper press mold 421: press upper mold projection
S100: Elbow material preparation step
S110: Pipe material drawing step S120: Elbow material cutting step
S200: Bending Press Stage
S210: Elbow material mounting step S220: Elbow material bending step
S300: Crimping press step
S310: Elbow material fixing step S320: tool groove forming step
S400: thread forming step

Claims (7)

A bending press step of bending the elbow material at a right angle by a bending press die, a bending press step of bending the elbow material at a right angle to the elbow material, A pressing and pressing step of forming a recess in the upper and lower portions of the bending portion of the elbow material so as to be recessed by the press-forming die; and a thread forming step of machining a thread on both ends of the elbow material,
Wherein the compression press mold comprises:
A press-fit lower mold having protrusions protruded when the bended elbow material is fixed in a horizontal state and pressed so as to contact the lower surface of the bent portion of the fixed elbow material;
And a press-fit upper mold provided so as to be vertically movable upward and downward above the press-down lower mold and having a press-fit upper surface protrusion protruded to face the protrusion so as to contact the upper surface of the bent portion of the elbow material when the press-
The press-
An elbow material fixing step in which the elbow material is horizontally fixed to the press-down lower mold so that the lower surface of the bent portion of the elbow material is in contact with the protrusion when the press-
The upper press mold is lowered toward the press lower mold so that the press upper surface protrusion presses the upper surface of the bent portion of the elbow material so that the protrusion presses the lower surface of the bent portion of the elbow material, And a tool groove forming step of forming upper and lower tool groove grooves in the upper and lower parts.
The method according to claim 1,
The elbow material preparation step may include:
A pipe material drawing step of producing the pipe material by a drawing process,
And an elbow material cutting step of cutting the pipe material into an elbow material having a predetermined length.
The method according to claim 1,
The bending press mold includes:
A bending lower mold having a bent seating portion recessed downward in a central direction,
And a bending upper mold which is installed above the bending lower mold so as to be able to move up and down,
The bending press step comprises:
An elbow material placing step in which both ends of the elbow material are held at both ends of the bending seating portion of the bending lower die;
And an elbow material bending step in which the bending upper die is lowered toward the lower bending die to form the bending lower end of the elbow material in the bending seating part of the lower bending while bending the elbow material. Gt;
delete The method of claim 3,
Wherein the pipe material is manufactured by drawing and forming to an outer diameter of 16 mm and an inner diameter of 5 mm.
6. The method of claim 5,
The bending press mold includes:
The bent seating portion of the bending lower metal mold is depressed downward at an angle of 88 degrees, the recessed edge is rounded to a radius of 23 mm (R23)
Wherein the bending upper portion of the bending upper mold is pushed downward at an angle of 85 degrees and the protruding edge is rounded to a radius of 7 mm (R7).
The method according to claim 6,
Wherein the tool groove of the elbow material is recessed in the upper and lower portions to a depth of 1 to 2 mm, respectively.
KR1020150170383A 2015-12-02 2015-12-02 Method for manufacturing elbow used in connecting high pressure pipe KR101638749B1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101677396B1 (en) 2015-11-02 2016-11-18 주식회사 포스코 Ultra high strength steel sheet having excellent formability and expandability, and method for manufacturing the same
KR200485798Y1 (en) * 2017-04-10 2018-02-26 신영공업 주식회사 Joint pipe for fire hydrant hose reel
KR102125037B1 (en) 2018-12-28 2020-06-19 (주)태경유압기계 An Automatic Pipe Bending Apparatus
KR20220040582A (en) * 2020-09-24 2022-03-31 김금식 Rod-shaped pipe connection method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06210377A (en) * 1993-01-13 1994-08-02 Sakuhei Fujita Method for forming elbow by metallic pipe
JPH1099917A (en) * 1996-09-30 1998-04-21 Mitsuike Kogyo Kk Pressing device
JP2002172428A (en) * 2000-12-01 2002-06-18 Tokiwa Seiki Kk Method and apparatus for manufacturing thick bent-tube
KR100396307B1 (en) * 2000-11-30 2003-08-27 토키와 세이키 가부시키가이샤 Method and apparatus for manufacturing thick-walled bent pipe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06210377A (en) * 1993-01-13 1994-08-02 Sakuhei Fujita Method for forming elbow by metallic pipe
JPH1099917A (en) * 1996-09-30 1998-04-21 Mitsuike Kogyo Kk Pressing device
KR100396307B1 (en) * 2000-11-30 2003-08-27 토키와 세이키 가부시키가이샤 Method and apparatus for manufacturing thick-walled bent pipe
JP2002172428A (en) * 2000-12-01 2002-06-18 Tokiwa Seiki Kk Method and apparatus for manufacturing thick bent-tube

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101677396B1 (en) 2015-11-02 2016-11-18 주식회사 포스코 Ultra high strength steel sheet having excellent formability and expandability, and method for manufacturing the same
KR200485798Y1 (en) * 2017-04-10 2018-02-26 신영공업 주식회사 Joint pipe for fire hydrant hose reel
KR102125037B1 (en) 2018-12-28 2020-06-19 (주)태경유압기계 An Automatic Pipe Bending Apparatus
KR20220040582A (en) * 2020-09-24 2022-03-31 김금식 Rod-shaped pipe connection method
KR102384405B1 (en) * 2020-09-24 2022-04-07 김금식 Rod-shaped pipe connection method

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