KR20160130623A - Manufacturing Method for Tapered Pipe and its Apparatus and Tapered Pipe thereby - Google Patents

Manufacturing Method for Tapered Pipe and its Apparatus and Tapered Pipe thereby Download PDF

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KR20160130623A
KR20160130623A KR1020150062628A KR20150062628A KR20160130623A KR 20160130623 A KR20160130623 A KR 20160130623A KR 1020150062628 A KR1020150062628 A KR 1020150062628A KR 20150062628 A KR20150062628 A KR 20150062628A KR 20160130623 A KR20160130623 A KR 20160130623A
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roller
taper
tapered
welding
pipe
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KR1020150062628A
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Korean (ko)
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KR101691413B1 (en
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박경원
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박경원
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    • 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
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0803—Making tubes with welded or soldered seams the tubes having a special shape, e.g. polygonal tubes
    • 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
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0807—Tube treating or manipulating combined with, or specially adapted for use in connection with tube making machines, e.g. drawing-off devices, cutting-off
    • B21C37/0811—Tube treating or manipulating combined with, or specially adapted for use in connection with tube making machines, e.g. drawing-off devices, cutting-off removing or treating the weld bead

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laser Beam Processing (AREA)

Abstract

The present invention relates to a tapered pipe. The present invention provides a method and a device to manufacture a tapered pipe and a tapered pipe manufactured by the same to solve a problem, wherein a process of cutting and polishing openings on both sides to level an opening after welding in an existing tapered pipe manufacturing method using a steel sheet is very complex, and the tapered pipe individually and separately manufactured in accordance with a length and diameter of the tapered pipe. The steel sheet is accurately cut in a shape in which a small fan shape among two fan shapes having a same contained angle () is subtracted from a large fan shape by a laser cutter. The steel sheet is bent by three taper rollers arranged in a triangular form and the edges facing each other welded, and a welding unit rolled and polished; thereby omitting unnecessary processes, and the accurate tapered pipe easily manufactured without abandoned materials at low costs. To achieve this purpose of the present invention, the taper roller wherein the length of an arc with a large diameter is formed in a ratio becoming larger to as much as double of 2, a contained angle ()/360, and a moving distance between two circular arcs than the length of the arc with a small diameter is used to bend the steel sheet cut by laser in the shape of the large fan shape among the two fan shapes with the same contained angle () using the taper roller; and the edges facing the each other are welded, and the protruding welding unit polished after being rolled, thus manufacturing the tapered pipe.

Description

TECHNICAL FIELD The present invention relates to a taper pipe manufacturing method and a taper pipe manufacturing method using the same,

The present invention relates to a tapered pipe, and more particularly, to a method of cutting a tapered pipe by using a conventional steel plate, In order to solve the problem of manufacturing separately, three taper rollers arranged in a triangular shape are used to precisely cut a steel plate cut out from a large fan-shaped portion of two fan-shaped portions having the same inclination angle (?) By using a laser cutter A method of manufacturing a precise tapered pipe at low cost without using an abandoned material by omitting an unnecessary process by welding and bending and welding the opposing edge faces and then rolling and polishing the welded part, To a tapered pipe.

In general, a taper pipe refers to a pipe having a diameter that is reduced or increased at a constant rate from one side to the other.

These tapered pipes are made of wood, and they are made of tapered rods. When they are used, they are made of metal because they have much room for improvement. When they are manufactured by milling, they are laborious and expensive. So that it is usually manufactured as a casting.

However, the production of castings also has a problem in that it is reluctant to manufacture high-priced molds due to high production costs due to expensive mold manufacturing, melting and cooling of materials during work, and high cost.

Therefore, if the metal plate is bent, it can be manufactured at a low cost. However, as shown in FIGS. 1 and 2, the tapered pipe has a problem that it is very difficult to precisely bend the tapered pipe due to its shape.

In detail, as shown in FIG. 1, when the steel sheet is bent after the steel sheet for manufacturing a metal tapered pipe, a lot of portions to be cut after welding are overlapped as shown in FIG. 1, There is a problem that it is very difficult to finely cut and polish the upper and lower ends of the tubular shape after finishing the tubular shape, and it is difficult to work precisely.

In addition, if the gap between the edges facing each other after the bending is not uniform, the welding operation can not be performed, and the work of bending uniformly as a whole is very difficult.

In addition, when the bent steel plate is welded for the production of the metal tapered pipe, the welded portion is thermally expanded due to thermal expansion, so that it is bulged more than the other portions, so that the tapered pipe must be rolled at a constant and uniform pressure.

Conventional table and table legs are mainly used for making wooden legs, but wooden legs are loosened due to loosening of bolts during use, and there are limitations in applying various colors. There has been a demand of.

However, when such a metal table and a leg for a table are manufactured to have an I-shaped cross section or an L-shaped cross-section, there arises a problem that a severe wound and pain are caused when a leg or foot is impacted due to carelessness of a user. There has been a demand for a leg of a shape, but the manufacturing itself is difficult and the cost is excessive, so that there has been a problem of being reluctant to produce.

Korean Patent Application No. 10-1996-21224 filed on December 27, 1994, entitled "Extrusion die of hollow material" Korean Patent Application No. 10-1999-53000 filed on December 23, 1997, entitled "Tapered tube manufacturing method and apparatus" Korean Patent No. 10-1335872 filed on May 28, 2013, entitled " Pipe Manufacturing Method and Manufacturing Apparatus "

DISCLOSURE Technical Problem Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a taper pipe manufacturing method and a manufacturing method thereof, In order to solve the problem of manufacturing separately, three taper rollers arranged in a triangular shape are used to precisely cut a steel plate cut out from a large fan-shaped portion of two fan-shaped portions having the same inclination angle (?) By using a laser cutter A method of manufacturing a precise tapered pipe at low cost without using an abandoned material by omitting an unnecessary process by welding and bending and welding the opposing edge faces and then rolling and polishing the welded part, The present invention has been made in view of the above problems.

In order to achieve the above object, the present invention provides a method of manufacturing a steel plate, Cutting the steel sheet on which the line to be cut is drawn with a cutting device (S200); Bending the cut steel sheet using a tapered roller (S300); A welding step (S400) of welding the opposite side surfaces of the bent steel plate to form a tapered pipe; Rolling the projected welded portion of the welded tapered pipe (S500); And polishing the welded portion of the rolled tapered pipe (S600). The object of the present invention is to provide a method of manufacturing a tapered pipe.

In the taper pipe manufacturing method, it is preferable that, in the cutting preparation step (S100), the line to be cut is represented by a shape obtained by subtracting a small fan-shape from a larger fan-shape among two fan-shapes having the same inclination angle?

In the tapered pipe manufacturing method, in the bending step (S300), the diameter of the tapered roller (21) is increased or decreased at a certain rate from one side to the other side, Is preferably formed to be larger by the product of the moving distance between the two circular arc and the inclined angle &thetas; / 360 DEG than the arc length of the small portion.

In order to achieve the above object, the present invention provides a steel sheet cutting apparatus comprising: a steel plate cutting means (10) for precisely cutting a steel plate (1) using a laser in a shape obtained by subtracting a small sector from a large sector of two sectors having the same subtended angle? In order to taper the steel sheet cut by the cutting means 10, the diameter is increased or decreased at a certain rate from one side to the other side. The length of the arc of the portion having a larger diameter is smaller than the length of the arc of the portion having a smaller diameter, And a taper roller bending means (20) having a taper roller (21) formed at a ratio increasing by a product of 2P and a subtended angle (?) / 360 占; A weld fixing bar 31 for fixing the welding portion to be horizontal so as to precisely weld the opposite edge surfaces of the tapered bent steel strip 1, a welding rod transferring portion 32 for transferring the welding rod in the right and left direction at a constant speed, , A taper pipe welding means (30) provided at both ends of the movement distance of the welding rod and having a limit switch (33) for setting the start and end of welding; A rolling fixation bar 41 for fixing the welded portion 2a of the taper pipe 2 horizontally so as to roll the projected welded portion 2a of the welded taper pipe 2, And a tapered roller 42 having a hydraulic cylinder 44 for moving the rolling roller 43 at a constant speed and pressure while moving the rolling roller 43 in a right and left direction, Rolling means (40); And a taper pipe polishing means having a polishing wheel and a motor for precisely polishing the rolled welded portion (2a).

In the taper pipe manufacturing apparatus, the taper roller bending means 20 includes three tapered rollers 21 arranged in a triangular shape, spaced apart by a gap through which the steel sheet passes, one roller 21a on the upper side, Two rollers 21b and 21c are disposed on the lower side so that the steel plate 1 flows between the upper roller 21a and the first lower roller 21b and then the upper roller 21a and the second lower roller 21c And at the same time, the upper roller 21a is wrapped around the upper roller 21a.

The upper taper roller 21a of the taper roller bending means 20 and the welding fixing bar 31 of the taper pipe welding means 30 and the tapered roller rolling means 40 of the taper pipe manufacturing apparatus 20, It is preferable that at least one of the rolling and fixing bars 41 of the taper pipe 2 is formed so as to be openable and closable at one side so that the taper pipe 2 can be inserted.

In order to achieve the above object, the present invention provides a taper pipe manufactured using the taper pipe manufacturing apparatus.

The effects of the present invention are as follows.

Conventionally, in order to solve the problem that the process of cutting and grinding to make horizontal openings of both sides after welding is very cumbersome and the manufacturing process is separately made according to the length and diameter of the taper pipe, (θ), the steel plate precisely cut into a shape obtained by subtracting a small fan-shaped portion from a large fan-shaped portion is bent using three tapered rollers arranged in a triangular shape, and the opposite edge surfaces are welded, Thereby making it possible to manufacture a precise taper pipe at low cost and without any waste material, and an apparatus therefor and a taper pipe manufactured using the same.

Figs. 1 and 2 are schematic diagrams of parts that are required to be cut or polished when a taper pipe is manufactured by bending a conventional steel plate
3 is a developed view for cutting a steel sheet to which the present invention is applied
4 is a schematic view showing a bending apparatus using three taper rollers to which the present invention is applied.
5 is a schematic view showing a process of bending a steel sheet using a bending apparatus to which the present invention is applied.
6 is a schematic view showing an automatic welding apparatus for a taper pipe to which the present invention is applied
7 is a partial schematic view showing a state in which a taper pipe is welded by using a welding self-
8 is a schematic view showing a rolling apparatus of a taper pipe welded part to which the present invention is applied
9 is a partial schematic view showing a state in which a weld portion of a tapered pipe is rolled by using a rolling apparatus to which the present invention is applied
10 is a flowchart showing a taper pipe manufacturing process to which the present invention is applied

Hereinafter, the present invention will be described in detail with reference to preferred embodiments. It is to be understood, however, that the embodiments are illustrative of the invention in order that the invention may be better understood, and that the terms or words used should not be construed in a conventional or dictionary sense, It should be understood that the present invention should not be construed as being limited to the meanings and concepts consistent with the technical idea of the present invention based on the principle that the concept of the term can be appropriately defined in order to explain it by a method.

In the present invention, the length of the arc of a large-diameter portion is the same as that of a tapered roller formed by a moving distance between two arcs and a subtended angle &thetas; / 360 DEG, Among the two sectors having a subtended angle &thetas;, a steel plate cut by using a laser is formed by subtracting a small fan-shaped portion from a large fan-shaped portion, welding the opposing edge surfaces, and polishing the projected weld portion after rolling to manufacture a tapered pipe And a manufacturing apparatus and a taper pipe manufactured using the same.

(Example 1)

First, as shown in FIG. 10, a taper pipe manufacturing method of the present invention includes a cutting preparation step (S100) of drawing a line to be cut on a steel plate; Cutting the steel sheet on which the line to be cut is drawn with a cutting device (S200); Bending the cut steel sheet using a tapered roller (S300); A welding step (S400) of welding the opposite side surfaces of the bent steel plate to form a tapered pipe; Rolling the projected welded portion of the welded tapered pipe (S500); And polishing the welded portion of the rolled taper pipe (S600).

Thereafter, the manufactured taper pipe 2 may be manufactured in various colors including a step S700 for welding the other parts with the other parts, and a step S800 for performing powder coating as a whole after welding.

For example, the tapered tube 2 of the present invention can be used as four legs of a metal dining table having various colors when the diameter is small. When the diameter is made large, It can also be used as a bridge.

In the cutting preparation step (S100) of the taper pipe manufacturing method, the line to be cut is represented by a shape obtained by subtracting a small fan-shape from a larger fan-shape among two fan-shapes having the same subtended angle?.

As shown in FIG. 3, when a tapered pipe having a length and diameter of R2-R1 is D1,

The circumference of the larger diameter side of the taper pipe

Figure pat00001
, Which is the longer side of the arc length of the steel strip 1 to be cut
Figure pat00002
Respectively. In this case, the value of? In the present invention is set to 20 degrees. Therefore, R2 and L2 can be calculated because D1 is known.

Further, the length of the arc of the steel plate 1

Figure pat00003
R1 is also known.

Therefore, using the obtained R1 and R2, the circumference of the larger diameter of the tapered pipe is L2 and the circumference of the smaller diameter of the tapered pipe is L1. Actually, the portion to be cut by the line to be cut is a portion enclosed by L2, L1 and R2-R1, so that it becomes a portion obtained by subtracting a small fan-shaped portion from a larger fan-shaped portion.

The steel plate 1 is cut (S200) by drawing the line to be cut according to the calculated value (S100), then bent and bent so that both side openings are horizontally straightened at the time of forming the tapered pipe (S300) It is not necessary to cut and grind the workpiece, and the opposite edge surfaces for welding are precisely matched, so that separate cutting and polishing work is not required.

The diameter of the taper roller 21 used in the bending step S200 of the taper pipe manufacturing method may be increased or decreased as the diameter increases from one side to the other side, Is formed to be larger by the product of the travel distance between two arcs and the inclined angle &thetas; / 360 DEG than the arc length of the portion.

3, a tapered roller 21 having the same curvature as that of the steel plate 1 is manufactured in order to manufacture a tapered pipe while being in close contact with the steel plate 1. In this case, The length of the arc is

Figure pat00004
And the length of the arc of the small diameter portion is
Figure pat00005
to be. Since? is a preset value, the tapered roller 21 is manufactured using L4 and L1.

Since the distance between the arc of the large diameter part and the arc of the small diameter part is R4-R1, the difference of the arc length according to the moving distance

Figure pat00006
.

When the tapered roller 21 is manufactured to have such a ratio, the tapered tube 2 having the same curvature as the tapered roller 21 can be manufactured.

3, the length of a portion having a large diameter can be changed to D1, D2, D3 or the like as shown in FIG. 3, A tapered pipe (2) having a large diameter can also be manufactured. However, since the taper roller 21 and the bending unit 20 are limited in size, the movement distance, that is, the length (R4-R1) between the portion having a large diameter and the portion having a small diameter is limited.

A concrete manufacturing apparatus for manufacturing the tapered pipe by such a manufacturing process will be described as follows.

The taper pipe manufacturing apparatus of the present invention includes a steel plate cutting means 10, a taper roller bending means 20, a taper pipe welding means 30, a taper pipe rolling means 40 and a taper pipe polishing means .

First, the steel plate cutting means 10 can be manually operated, but in order to reduce precise work and material loss, a laser cutter capable of precise cutting according to a CAD drawing previously input is used in the present embodiment, A laser cutter capable of precisely cutting the steel plate 1 into a shape obtained by subtracting a small fan-shaped portion from a large fan-shaped portion of two sectors having a subtended angle? Is used.

Next, the taper roller bending means 20 is formed such that the diameter thereof is increased or decreased at a constant rate from one side to the other side in order to taper the steel sheet cut by the cutting means 10 at a predetermined curvature, The length of the arc of the portion is made up of the taper roller 21 formed at a ratio that is larger than the arc length of the arc of the small diameter by the moving distance between the two arcs and the product of 2P and the subtended angle (?) / 360 占.

The taper roller bending means 20 is manufactured by bending the steel plate 1 using at least one taper roller 21 and having the same value as the included angle? Thereby forming the tapered pipe 2 having a predetermined shape. In the embodiment of the present invention, the subtended angle? Is preset to 20 degrees.

As shown in FIGS. 4 and 5, in the embodiment of the present invention, three steel rollers 21 are arranged in a triangular arrangement with a gap spaced by a gap through the same tapered rollers 21, one roller 21a on the upper side, The steel plate 1 is introduced between the upper roller 21a and the first lower roller 21b (see FIG. 5 (a)), and then the upper roller 21a and the lower roller 21b (See Fig. 5 (b)) while being discharged through the second lower roller 21c while wrapping the upper roller 21a.

Further, since the bent taper pipe 2 is folded as a whole, the bent steel plate 1 can not be pulled out because it covers the upper roller 21a (see Fig. 5 (c)). Therefore, the upper roller 21a should be made so that one side is detachably formed (see Fig. 5 (d)) so that the bent steel plate 1 is separated after the bending operation (see Fig. 5 (e)).

The inclined angle? Of the taper roller 21 used in the embodiment of the present invention is 20 °, but it is possible to produce a tapered pipe having various diameters as described above. Of course, the curvature of the manufactured taper pipe is the same.

Next, as shown in Figs. 6 to 7, the tapered pipe welding means 30 is formed by precisely welding the opposite side surfaces of the tapered bent steel strip 1 to form a tapered pipe 2 A limit switch 33 provided at both ends of the movement distance of the welding rod for setting the start and end of the welding, and a welding stopper 32 for welding the welding rod to the left and right at a constant speed, .

It is very important for the present invention to fix the taper pipe 2 horizontally in order to precisely weld the bent steel strip 1 at a constant speed due to the characteristics of manufacturing the taper pipe 2. [

The welded fixing bar 31 of the present invention can fix the bent steel strip 1 to be horizontal and fix both ends of the welded area so as to precisely and easily weld the steel strip 1 to obtain high quality welding results.

In addition, the welding rod transfer section 32 can transfer the welding rod at a constant speed during the welding operation to enable homogeneous welding, and the limit switch 33 provided at both ends can automatically set the start and end of welding, Prevention and waste can be prevented.

Next, the taper pipe rolling means 40 is provided with a rolling fixing bar (not shown) for fixing the welded portion 2a of the taper pipe 2 to be horizontal so as to roll the projected welded portion 2a of the welded taper pipe 2 A rolling roller 43 which is in contact with and rotates in direct contact with the welded portion 2a and a rolling roller 43 which presses the rolling roller 43 at a constant speed And a hydraulic cylinder 44 for transferring the fluid to the left and right while pressing it with pressure.

The rolled fixing bar 41 is fixed so that the welded portion of the welded taper pipe 2 is leveled like the welded fixing bar 31 of the tapered pipe welding means 30. This is very important to ensure precise and uniform rolling during the welding operation as well as during the rolling operation. The rolling and fixing bar 41 is formed in such a structure that one side can be opened and closed so that the taper pipe 2 is inserted and fixed when the taper pipe 2 is fixed and the taper pipe 2 is separated after the rolling operation.

In addition, the pressure regulating portion 42 allows the operator to easily adjust the pressure applied by the rolling roller 43 to the weld portion 2a, thereby enabling the operation according to the work situation.

The hydraulic cylinder 44 pushes the welded portion 2a of the tapered pipe 2 with a strong force so that the rolling roller 43 can be pressed at a constant speed and pressure.

Next, the tapered pipe polishing means (not shown) is used for finely and precisely finishing the rolled welded portion 2a of the tapered pipe 2, and is provided with a polishing stationary bar for fixing the taper pipe 2 in the horizontal direction, A polishing grindstone transferring section for transferring the grindstone at a constant speed, and a motor for providing a driving force. The polishing fixing bar of the taper pipe polishing means is also formed in such a structure that one side can be opened and closed so as to be able to separate the taper pipe 2 after the taper pipe 2 is inserted and polished.

A taper pipe having various diameters can be manufactured precisely and easily by using the taper pipe manufacturing apparatus having the above-described structure. Thus, it is a very useful invention that can be produced at a very low cost because there is no unnecessary process and no discarded material.

Reference numeral 22 denotes a drive motor, reference numeral 23 denotes a reduction gear, reference numeral 24 denotes a chain, reference numeral 25 denotes an upper tapered roller attachment / detachment portion, and reference numeral 34 denotes a welding rod.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

Description of the Related Art
1: steel plate 2: taper pipe
2a: weld portion 10: steel plate cutting means
20: Tapered roller bending means 21: Tapered roller
21a: Upper taper roller 21b, 21c: Lower taper roller
30: Taper pipe welding means 31: Welding fixing bar
32: welding rod feed part 33: limit switch
40: tapered pipe rolling means 41: rolling fixing bar
42: pressure regulator 43: rolling roller
44: Hydraulic cylinder
S100: Cutting preparation step S200: Cutting step
S300: Bending step S400: Welding step
S500: rolling step S600: polishing step
S700: Welding step with other parts S800: Powder coating step

Claims (7)

A cutting preparation step (SlOO) for drawing a line to be cut on a steel sheet;
Cutting the steel sheet on which the line to be cut is drawn with a cutting device (S200);
Bending the cut steel sheet using a tapered roller (S300);
A welding step (S400) of welding the opposite side surfaces of the bent steel plate to form a tapered pipe;
Rolling the projected welded portion of the welded tapered pipe (S500);
And polishing the welded portion of the rolled taper pipe (S600). The method according to claim 1,
Wherein in the cutting preparation step (S100), the line to be cut is represented by a shape obtained by subtracting a small fan-shape from a larger fan-shape among two fan-shapes having the same inclination angle (?). 3. The method of claim 2,
In the bending step S300, the diameter of the tapered roller 21 is increased or decreased at a certain rate from one side to the other, and the length of the arc of the larger diameter is smaller than the length of the arc of the smaller diameter, Is formed to be a product of a moving distance of 2 袖 and a subtracted angle 慮 / 360 째. A steel plate cutting means (10) for precisely cutting the steel plate (1) using a laser in a shape of a large fan-shaped portion of two radii having the same subtended angle (?) Minus a small fan-shaped portion;
In order to taper the steel sheet cut by the cutting means 10, the diameter is increased or decreased at a certain rate from one side to the other side. The length of the arc of the portion having a larger diameter is smaller than the length of the arc of the portion having a smaller diameter, And a taper roller bending means (20) having a taper roller (21) formed at a ratio increasing by a product of 2P and a subtended angle (?) / 360 占;
A weld fixing bar 31 for fixing the welding portion to be horizontal so as to precisely weld the opposite edge surfaces of the tapered bent steel strip 1, a welding rod transferring portion 32 for transferring the welding rod in the right and left direction at a constant speed, , A taper pipe welding means (30) provided at both ends of the movement distance of the welding rod and having a limit switch (33) for setting the start and end of welding;
A rolling fixation bar 41 for fixing the welded portion 2a of the taper pipe 2 horizontally so as to roll the projected welded portion 2a of the welded taper pipe 2, And a tapered roller 42 having a hydraulic cylinder 44 for moving the rolling roller 43 at a constant speed and pressure while moving the rolling roller 43 in a right and left direction, Rolling means (40);
And a taper pipe polishing means having a polishing wheel and a motor for precisely polishing the rolled welded portion (2a). 5. The method of claim 4,
The taper roller bending means 20 includes three tapered rollers 21 arranged in a triangular shape so as to be spaced apart from each other by a gap through which the steel sheet passes and one roller 21a on the upper side and two rollers 21b and 21c on the lower side, The steel plate 1 is introduced between the upper roller 21a and the first lower roller 21b and then discharged to the space between the upper roller 21a and the second lower roller 21c and the upper roller 21a And is bent and tapered. 6. The method of claim 5,
At least one of the upper taper roller 21a of the taper roller bending means 20, the welding fixing bar 31 of the taper pipe welding means 30 and the rolling fixing bar 41 of the taper pipe rolling means 40 Wherein the taper pipe (2) is formed so that one side thereof can be opened and closed so as to be able to insert the taper pipe (2). A taper pipe manufactured using the taper pipe manufacturing apparatus according to any one of claims 4 to 6.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114700398A (en) * 2022-03-04 2022-07-05 中国一冶集团有限公司 Manufacturing method of large-size square-round reducer pipe

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Publication number Priority date Publication date Assignee Title
KR960021224A (en) 1994-12-27 1996-07-18 야노 유코 Extrusion Die of Hollow Material
KR19990053000A (en) 1997-12-23 1999-07-15 김덕중 Tapered pipe manufacturing method and device
JP2001170779A (en) * 1999-12-13 2001-06-26 Kawasaki Steel Corp Steel tube manufacturing method
JP2002011535A (en) * 2000-06-28 2002-01-15 Sankyu Inc Manufacturing method frustum
KR101335872B1 (en) 2013-05-28 2013-12-02 박용철 Method for manufacturing pipe and apparatus for manufacturing therefor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960021224A (en) 1994-12-27 1996-07-18 야노 유코 Extrusion Die of Hollow Material
KR19990053000A (en) 1997-12-23 1999-07-15 김덕중 Tapered pipe manufacturing method and device
JP2001170779A (en) * 1999-12-13 2001-06-26 Kawasaki Steel Corp Steel tube manufacturing method
JP2002011535A (en) * 2000-06-28 2002-01-15 Sankyu Inc Manufacturing method frustum
KR101335872B1 (en) 2013-05-28 2013-12-02 박용철 Method for manufacturing pipe and apparatus for manufacturing therefor

Cited By (1)

* Cited by examiner, † Cited by third party
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CN114700398A (en) * 2022-03-04 2022-07-05 中国一冶集团有限公司 Manufacturing method of large-size square-round reducer pipe

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