WO2023022532A1

WO2023022532A1 - Fitting pipe for automatic welding

Info

Publication number: WO2023022532A1
Application number: PCT/KR2022/012322
Authority: WO
Inventors: 이상헌
Original assignee: (주)뉴아세아
Priority date: 2021-08-18
Filing date: 2022-08-18
Publication date: 2023-02-23
Also published as: KR20240010520A

Abstract

The present invention relates to a fitting pipe for automatic welding, and more specifically to a fitting pipe for automatic welding with which it is not necessary to machine a chamfered surface at the portions where the ends of respective pipes to be connected abut one another and are welded, by rigorously managing the verticality of an end part being welded with a pipe to be connected, in order to be able to weld with an automatic welder. To this end, the fitting pipe for automatic welding, according to the present invention, comprises a fitting body having openings at either end thereof corresponding with the open end parts of pipes to be connected, wherein the end of an opening is brought into contact with an open end part of a pipe to be connected, the end of the opening being formed so as to have a flat surface shape in order to form a vertical or horizontal join surface, and welding beads are formed, by means of an automatic welder, along the vertical or horizontal join surface, and thus the fitting pipe can be welded and joined to the pipe to be connected.

Description

Fitting pipe for automatic welding

The present invention relates to a fitting pipe applied to automatic welding, and more particularly, to be welded with an automatic welding machine without the need for machining such as a chamfer surface at each end of a pipe to be connected and welded to each other. It relates to a fitting pipe for automatic welding manufactured by strictly managing the verticality and roundness of the end welded to the pipe.

In general, fitting pipes such as elbows or tees, which are pipe bends, are pipe joint connectors used by being connected to a position where the flow direction of a fluid such as liquid or gas flowing inside the pipe is changed, and is molded into various angular shapes. In order to do so, it is manufactured by bending a metal pipe material.

Among these fittings, the bend pipe means 'a pipe bent in the shape of an elbow' in the dictionary meaning, and is called an elbow. can be manufactured with

The process of manufacturing an elbow, a well-known fitting pipe, includes a bending step of bending a straight metal pipe, a first pipe expansion step of putting the bent metal pipe into the primary expander and expanding the pipe, and putting the first expanded metal pipe into the secondary expander. It may consist of a secondary expansion process to expand the tube. The elbow manufactured in this way can be used as a pipe fitting for a metal pipe.

As shown in FIG. 1, separate machining is performed on each cross section of the end of the elbow 1 and the end of the connected pipe 2, as shown in FIG. After processing the

chamfered surfaces

1a and 2a inclined at a certain angle by the above, and then forming a welding bead B along the circumference of the butt portion where the

chamfered surfaces

1a and 2a come into contact with each other, fittings such as elbows The work of welding and connecting the pipe and the connected pipe to each other was performed manually.

However, if the butt welding, which welds the elbow and the pipe to be connected butt-to-butt, is performed manually, machining to form the chamfered surface at each end must be performed, so the overall process according to the machining that is essential before the welding process It acted as a factor increasing the manufacturing cost.

In addition, when butt welding, which welds the elbow and the end of the pipe to be connected, is performed using an automatic welding machine (not shown), since automatic welding must be performed along the weld area that is widened while being in contact with each other, the welding conditions are constant. It is not maintained properly, and the setting of welding conditions is complicated, and this causes problems that it is difficult to apply automatic welding.

(Patent Document 1) KR10-1640538 B1

The technical problem to be solved by the present invention is the verticality and roundness of the end of the connected pipe and the end to be welded so that the end of the connected pipe and the welded portion are welded with an automatic welding machine without the need for machining such as chamfering. It is intended to provide a fitting pipe for automatic welding that is manufactured by strictly managing.

The technical problem to be solved in the present invention is not limited thereto, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

A fitting pipe for automatic welding according to the present invention for solving the above technical problem includes a fitting body having an open opening at an end corresponding to an open end of a connected pipe, and an end of the opening is the blood It is formed on a plane to form a vertical or horizontal joint surface in contact with the open end of the connecting pipe, and a welding bead is formed by an automatic welding machine along the vertical or horizontal joint surface to be welded to the connected pipe. .

In this case, the first off distance formed between a tangent line contacting the end of the opening of the fitting body and a vertical line intersecting at right angles to the center line of the fitting body may be set to 1.0 mm or less.

In this case, the second off distance formed between a vertical line passing through the center of the body of the fitting body and a vertical axis passing through the center of the opening of the fitting body may be set to 1.0 mm or less.

At this time, the fitting body may be molded and manufactured by processing a metal raw material having a thickness of 2 mm or more.

The fitting pipe for automatic welding of the present invention having the above-described configuration forms the end of the opening of the fitting body that abuts each end of the pipe to be connected with each other on a plane perpendicular to the machining process, which is a preceding step for forming the chamfered surface. It is fundamentally excluded to reduce manufacturing cost, and it is possible to more efficiently perform an operation of welding the fitting body and the connected pipe to each other by an automatic welding machine.

1 is a configuration diagram showing butt welding between a general elbow fitting pipe and a connected pipe.

2 is a configuration diagram showing butt welding between a fitting pipe for automatic welding and a connected pipe according to an embodiment of the present invention.

3A and 3B are front and side views showing tolerances of a fitting tube for automatic welding according to an embodiment of the present invention.

4a, 4b, 4c and 4c are schematic diagrams illustrating a process of manufacturing an elbow pipe from a fitting pipe for automatic welding according to an embodiment of the present invention in a forming device.

5A and 5B are schematic views illustrating a process of manufacturing a fitting pipe for automatic welding according to an embodiment of the present invention into a tee pipe in another molding apparatus.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. This invention may be embodied in many different forms and is not limited to the embodiments set forth herein. In order to clearly describe the present invention in the drawings, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

In this specification, terms such as "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

2 is a configuration diagram showing butt welding between a fitting pipe for automatic welding and a pipe to be connected according to an embodiment of the present invention, and FIGS. 3A and 3B are allowable tolerances of a fitting pipe for automatic welding according to an embodiment of the present invention. It is a front view and a side view showing.

Hereinafter, a description will be made with reference to configurations shown in FIGS. 2, 3A and 3B.

A fitting pipe E for automatic welding according to an embodiment of the present invention includes a fitting body 10 having a substantially circular opening 10a opened at one end corresponding to the open end of the connected pipe 20. can do.

The fitting body 10 may be made of a hollow tube made of a metal material whose body is bent at an angle of about 90° or a hollow tube made of a metal material whose body is formed in an approximate T shape. The central opening may be formed and processed by an elbow forming device or a tee forming device to be described later to have the same inner and outer diameters.

The ends of these openings 10a come into contact with the open ends of the connected pipes 20 facing each other during automatic welding by an automatic welding machine (not shown) to form a substantially vertical or substantially horizontal joint surface such as a chamfered surface. It may be formed on a plane that is not formed.

That is, the end of the open opening 10a of the fitting body 10 may be formed as a vertical surface or a horizontal surface intersecting at right angles to a center line extending from the center of the opening.

In this case, the end of the open opening 10a of the fitting body 10 and the end in contact with the open end of the connected pipe 20 are vertical or horizontal without forming an inclined surface such as a chamfered surface by the automatic welding machine. A bonding surface can be formed.

Accordingly, the end of the fitting body 10 and the end of the connected pipe 20 are connected to each other by forming a welding bead B while performing automatic welding along the circumference of the vertical or horizontal joint surface using an automatic welding machine. Can be welded together.

At this time, the welding bead (B) integrates the joint surface between the vertical or horizontal end of the fitting body (10) and the end of the connected pipe (20) and integrates the open end of the fitting body (10) with the connected pipe (20). It is a weld metal that is melt-joined to the outer surface of the fitting body and the outer surface of the pipe to be connected along the circumference so as to weld the open ends of (20) to each other.

In addition, in order to prevent welding defects during the process of automatically welding the joint surface between the end of the opening 10a of the fitting body 10 and the end of the connected pipe 20 with an automatic welding machine, as shown in FIG. 3A , A first offset distance formed between a tangent line X1 contacting the end of the opening 10a of the fitting body 10 and a vertical line X2 crossing the center line of the fitting body 10 at right angles ( X) is preferably set to approximately 1.0 mm or less.

In order to prevent welding defects during the process of automatically welding the joint surface between the end of the opening 10a of the fitting body 10 and the end of the connected pipe 20 with an automatic welding machine, as shown in FIG. 3B, A second offset distance (Y) formed between a vertical line (Y1) passing through the center of the body of the fitting body (10) and a vertical axis (Y2) passing through the center (O) of the opening of the fitting body (10) is preferably set to approximately 1.0 mm or less.

Accordingly, when the first off-distance X and the second off-distance Y exceed 1.0 mm, the joint surface between the opening end of the fitting body 10 and the open end of the connected pipe 20 Since welding defects may be caused during automatic welding due to an excessively generated gap, the first and second off distances (X, Y) are such that the opening end of the fitting body 10 is aligned with the vertical line (X2) or the vertical axis (Y2). It is preferable to manage the dimensions from 0 coincident with 1.0 mm or less, which is a distance away from the vertical line or vertical axis.

4a, 4b, 4c, and 4d are schematic diagrams illustrating a process of manufacturing an elbow pipe from a fitting pipe for automatic welding according to an embodiment of the present invention in a forming device.

As shown in Figs. 4a, 4b, 4c and 4d, the automatic welding fitting pipe E having the above configuration includes upper and

lower molds

100 and 200, a mandrel 300 and a pusher 400. As shown in FIGS. 5A and 5B, manufactured in an elbow shape by an elbow forming device, a tee forming device including upper and lower molds 100a and 200b, a pair of left and right pushers 400a and an upper pusher 400c It can be manufactured in the form of a tee tube by.

As shown in FIG. 4A, the process of manufacturing an elbow-shaped fitting tube is to precisely cut a line C at both ends of a hollow pipe having a certain length using a cutting machine such as a laser cutter to a preset design value. Prepare a pipe-shaped raw material (P) in which both open ends are cut obliquely at a predetermined angle by cutting obliquely along.

At this time, the length of the hollow pipe cut along the cutting line (C) has a tolerance of about 2 to 3 mm in consideration of elastic deformation and shrinkage deformation during molding of the pipe-shaped raw material (P) by the elbow forming device. It is preferable to set large to have.

As shown in FIGS. 4B and 4C, the upper mold 200 is moved upward to a certain height relative to the lower mold 100, and the mandrel 300 is disposed on the curved path of the lower mold 100, and both ends are The pipe-shaped raw material P, which is cut obliquely at a certain angle and has a substantially trapezoidal cross-section, is placed and placed at the entrance of the lower mold 100 corresponding to the pusher.

When the upper mold 200, which is a movable mold, is lowered and vertically combined with respect to the lower mold 100, which is a fixed mold, the pipe-shaped raw material P is vertically combined by the forward operation of the pusher 400. A hollow cavity capable of entering and moving toward the mandrel is formed inside the upper and lower molds.

Subsequently, when the pusher 400 is operated forward, the pipe-shaped raw material P is forced into the gap formed between the inner surfaces of the upper and

lower molds

100 and 200 and the outer surface of the mandrel 300. While being deformed into the same curved shape as the outer surface of the mandrel, the fitting body 10 is formed.

At this time, the pipe-shaped raw material (P) may be a metal material having a thickness of 2 mm or more, and the fitting body 10 is molded and manufactured by processing such a pipe-shaped raw material (P).

When the molding of the fitting body is completed by the forward movement of the pusher 400, the upper mold 200 is raised and returned together with the mandrel 300 inserted into the outer surface of the fitting body 10, and then the fitting body 10 is lifted and returned. By separating the main body from the outer surface of the mandrel, the ends of the openings 10a on both sides coincide with the imaginary intersection line that intersects the center line of the opening at a substantially right angle, and the elbow-shaped fitting pipe E formed on a vertical or horizontal plane is manufactured. will do

In addition, as shown in FIG. 4D, the fitting pipe E formed by the elbow forming device is stored in the fitting pipe before being shipped to the outside by the correction block 500 or the upper and lower correction molds 600. A process of calibrating the curvature of the bent portion formed to be bent and the inner diameter of both open ends of the fitting pipe to match a preset design value may be performed.

That is, a correction block 500 is prepared in which a curved curved groove 505 into which the bending part is inserted is recessed on the upper surface corresponding to the bending part of the fitting pipe E.

A pair of internal diameter correction jigs 501 disposed facing both open ends of the fitting tube E in a state where the bending portion corresponding to the middle of the length of the fitting tube E is inserted into the curved groove of the correction block By forcibly entering the ends into the inside of both open ends of the fitting pipe (E) by the pressing force of an unshown hydraulic device, the inner surface of the both open ends of the fitting pipe (E) is the inner diameter of the opening end of the fitting pipe (E) set in advance. In contact with the outer surface of the end of the inner diameter correction jig 501 manufactured to match, it can be calibrated to the inner diameter size corresponding to the inner diameter design value of the fitting pipe.

The curved end of the curvature correction jig 502 disposed facing the bent portion of the fitting tube E disposed in the curved curved groove of the correction block 500 is pressed by a hydraulic device, not shown. By contacting and pressurizing the bending part of (E), the inner bending part of the fitting pipe is in contact with the outer curved end of the curvature correction jig 502 manufactured to match the curvature size of the bending part of the fitting pipe set in advance, and the fitting pipe is calibrated to a curvature corresponding to the curvature design value of, and the outer bending portion of the fitting pipe is in contact with the inner surface of the curved curved groove made to match the curvature size of the bending portion of the fitting pipe set in advance, and the curvature design value of the fitting pipe It can be corrected with a corresponding curvature.

In addition, upper and lower

orthodontic molds

600 and 700 in which upper and lower

curved grooves

601 and 701 in which the bending parts are inserted and disposed are respectively recessed are prepared on the upper and lower surfaces corresponding to the bending parts of the fitting pipe E. .

In a state in which a part of the body of the fitting tube E is inserted into the lower curved groove 601 of the lower calibration mold 600, the rest of the body of the fitting tube is inserted into the upper curved groove 701 of the upper calibration mold. Upper and lower curved grooves ( 601 and 701) may be calibrated to a curvature corresponding to the design value of the curvature of the fitting tube as the inner and outer surfaces come into contact with each other and are pressed.

On the other hand, in the process of manufacturing a fitting tube in the form of a tee, as shown in FIGS. 5A and 5B, the upper mold 200a is first moved upward to a certain height with respect to the lower mold 100a, and the lower mold 100a The openings on both sides of the pipe-shaped raw material P1 formed in the shape of a tee at the top are seated and prepared so that they face the pair of left and right pushers 400a.

When the upper mold 200a is lowered with respect to the lower mold 100a by the lowering operation of the upper pusher 400c and combined vertically, the left and right pair of pushers 400a and the raw material with both ends of the opening facing each other are disposed inside A cavity is formed between the upper and lower molds.

Subsequently, when the left and right pair of pushers 400a are operated forward, the open ends of both sides of the raw material P1 and each tip of the pusher come into contact with each other, and the raw material interposed between the upper and lower molds is fixed. It is molded into a tee-shaped fitting body 10.

At this time, the raw material P1 may be a metal material having a thickness of 2 mm or more, and the fitting body 10 is molded and manufactured by processing the raw material P1.

Finally, when the molding of the fitting body is completed by the downward operation of the upper pusher 400c and the forward operation of the pusher 400a, the molded fitting body is exposed by the upward and backward movement of the upper pusher. By separating it from the lower mold, a tee-shaped fitting tube formed on a vertical or horizontal plane coincident with an imaginary intersection line where the ends of the openings 10a on both sides intersect at right angles to the center line of the opening is completed.

Although one embodiment of the present invention has been described, the spirit of the present invention is not limited to the embodiments presented herein, and those skilled in the art who understand the spirit of the present invention may add or change elements within the scope of the same spirit. Other embodiments can be easily proposed by deleting, adding, etc., but this will also be said to be within the scope of the present invention.

Claims

A fitting body having openings open at both ends corresponding to the open end of the connected pipe,

The end of the opening is formed on a plane to form a vertical or horizontal joint surface in contact with the open end of the connected pipe, and a welding bead is formed by an automatic welding machine along the vertical or horizontal joint surface to form the blood Fitting pipe for automatic welding, connected by welding to the connector pipe.
According to claim 1,

A first off distance formed between a tangent line contacting the end of the opening of the fitting body and a vertical line intersecting at right angles to the center line of the fitting body is set to 1.0 mm or less.
According to claim 1,

A fitting tube for automatic welding, characterized in that the second offset distance formed between a vertical line passing through the center of the body of the fitting body and a vertical axis passing through the center of the opening of the fitting body is set to 1.0 mm or less.
According to claim 1,

The fitting body is a fitting pipe for automatic welding, characterized in that it is molded and manufactured by processing a raw material of a metal material having a thickness of 2 mm or more.