KR20190033806A - Elbow and Elbow Manufacturing Method - Google Patents

Abstract

The present invention relates to an elbow and an elbow manufacturing method. According to the present invention, the elbow manufacturing method comprises the steps of: bending a pipe to form a first preliminary product as both end surfaces and one position of a pipe having a through-hole formed therein are pressed to form a first bending part; pressing both the end surfaces of the first preliminary product with a force greater than that of when forming the first preliminary product and pressing the one position with a force less than that of when forming the first preliminary product such that a second preliminary product more bent than the first preliminary product as the first bending part is formed into a second bending part; pressing both the end surfaces of the second preliminary product with a force greater than that of when forming the second preliminary product and pressing the one position with a force less than that of when forming the second preliminary product such that a third preliminary product bent more than the second preliminary product as the second bending part is formed into the third bending part with a length between upper and lower surfaces less than a length between both side surfaces and both protruding side surfaces; and pressing both protruding sides of the third bending part without pressing both the end surfaces and the one position of the third preliminary product such that the third bending part is formed into a fourth bending part while increasing a length between upper and lower surfaces, which are a plain surface, and decreasing a length between both the side surfaces, thereby forming a completed product bent more than the third preliminary product, wherein a hexagonal hollow material is bent while applying a pressing force to each position of a pipe by each bending angle through the steps such that the inner circumferential surface of the bent part becomes a round shape, thereby reducing noise and energy loss even if fluid flows therein.

Description

[0001] DESCRIPTION [0002] Elbow and Elbow Manufacturing Method [

The present invention relates to a method of manufacturing a curved tube elbow and a curved tube elbow, and more particularly to a method of manufacturing a curved tube elbow and a curved tube elbow by bending a hexagonal hollow material at different bending angles, To a method of manufacturing a curved elbow and a curved elbow in which noise and energy loss are reduced.

Typically, several pipes used for transporting liquids or fluids are connected in a longitudinal direction. In the course of connection, there is a case where the connection is made with a "B" or a "T" depending on the conditions of the terrain. At this time, the pipe is connected to another pipe using a joint at a proper predetermined position.

For example, there is an elbow which is used as a joint of piping lines to which hydraulic pressure is applied and which is used for a connection where the fluid flow is changed. Elbows are applied to construction, agricultural machinery, and industrial machinery.

1, the through hole 40 of the conventional elbow 10 has a diameter smaller than the diameter of the curved portion 50 of the fluid inlet and outlet of the elbow 10. Further, when the elbow 10 is substantially rectangular, the corner of the bent portion 50 is formed as a rugged portion 30 on the upper side, and the lower side is formed as a right angle. Therefore, when the fluid flows through the through-hole 40, a vortex phenomenon occurs in the rugged portion 30 of the bent portion 50 of the elbow 10, thereby increasing the energy loss.

In addition, in the conventional elbow 10, the through hole 40 is formed on the inner side by drilling, which causes a problem that a large number of chips are generated.

On the other hand, even if the inner diameter and the outer diameter of the elbow 10 are the same, if the bending angle is different, there is a problem that the elbows 10 must be made into different molds for each type.

On the other hand, a technique for forming an elbow in a pipe by providing a bending force to a pipe that the applicant wishes to output is disclosed in Patent Document No. 10-1633036 (hereinafter referred to as Patent Document 1).

Patent Document 1 discloses a metal mold for supporting a part of a pipe P and supporting a part of the remainder of the pipe P, A pair of return means 910 for resiliently connecting the first and second support dies 100 and 200 and a pair of return means 910 for rotatably connecting the first and second support dies 100 and 200 to each other at both ends of the pipe P, First and second compression members 300 and 400 which are respectively disposed on the first and second support dies 100 and 200 to provide a longitudinal compressive force to the pipe P and a lifting member 500 that is vertically movable up and down from the first and second support dies 100 and 200, First and second side molds 600 and 700 disposed on the left and right sides of the first and second support dies 100 and 200 and a second side mold 600 and 700 provided on both sides of the elbow E formed on the pipe P And a pair of panels 920 connecting the first and second support dies 100 and 200 to the first and second side molds 600 and 700 and the side compression member 800, .

A driving step of the pipe elbow manufacturing apparatus 10 including the above-described configuration of Patent Document 1 and a method of manufacturing the pipe elbow by the driving are as follows.

First, the pipe P on which the elbow E is to be formed is placed on the first and second support dies 100, 200. At this time, the first and second support dies 100 and 200 are maintained in a horizontal state.

In order to adjust the distance of the first and second compression members 300 and 400 in which the angle of the elbow E to be formed on the pipe P is adjusted and the pipe P is positioned after the pipe P is supported, The tilting angle of the first and second side molds 600 and 700 is adjusted.

After the adjustment of the tilting angle is completed, the elevating member 500 descends and the first bar 510 is brought into contact with the first and second driving grooves 131 and 231 of the first and second driving blocks 130 and 230.

The first bar 510 then moves the first and second drive grooves 131 and 231 of the first and second drive blocks 130 and 230 from the upper side to the lower side The first driving block 130 is rotated clockwise about the first rotating shaft 120 and the second driving block 230 is rotated about the second rotating shaft 220 in the counterclockwise direction The first and second driving blocks 130 and 230 are rotated in opposite directions to each other so that the first and second driving blocks 130 and 230 are positioned in front of the first and second driving blocks 130 and 230. [ And 240 rotate in opposite directions to each other. Therefore, the first and second support dies 100 and 200 rotate in opposite directions and the first and second rollers 333 and 433 of the first and second compression members 300 and 400 are rotated in the first and second Sliding along the curved surfaces 611 and 711 upward.

In this case, the pipe P is bent due to the bending force caused by the rotation of the first and second support dies 100 and 200 to form the elbow E. As described above, the first and second compression members The first and second rollers 333 and 433 of the first and second rollers 300 and 400 slide upward along the first and second curved surfaces 611 and 711 so that the first and second pins 320 and 420 move to the left So that the pipe P is firmly fixed due to the compressive force to further facilitate the formation of the elbow E in the pipe P. In this way,

When the elevating member 500 continues to descend while the first bar 510 presses the first and second driving grooves 131 and 231, the second projection 520 of the second bar 520 of the elevating member 500 The pipe 521 is brought into contact with the upper surface of the pipe P and the fixing groove 522 of the second projection 521 fixes the upper surface of the pipe P to prevent the pipe P from rising upwardly, The pipe P is firmly fixed together with the first and second compression members 300 and 400 so that the elbow E can be formed more easily on the pipe P.

The third and fourth bars 530 and 540 of the lifting member 500 press the upper surfaces of the first and second vertical movement blocks 840 and 850 to move the first and second vertical movement blocks 840 and 850, 2 vertically moving blocks 840 and 850 are vertically moved downward by the fourth and fifth springs 841 and 851 and the first and second vertically moving blocks 840 and 850 are vertically moved, The two inclined surfaces 843 and 853 interact with the third and fourth inclined surfaces 861 and 871 of the first and second horizontal movement blocks 860 and 870 to respectively move the first and second horizontal movement blocks 860 and 870 Move horizontally backward and forward.

In this case, as the pipe P is bent while the elbow E is formed in the pipe P, the elbow E of the pipe P is moved downward, that is, in the first and second horizontal movement blocks 860 and 870, The first and second horizontally moving blocks 860 and 870 provide compressive forces on both sides of the elbow E due to the horizontal movement so that both sides of the elbow E, Thereby preventing the front surface and the rear surface from protruding.

Patent Registration No. 10-1633036

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of manufacturing a curved tube elbows and a curved tube elbows in which the noise and the pressure loss generated in the through holes of the elbow are improved.

It is another object of the present invention to provide a method of manufacturing a curved tube elbow and a curved tube elbow in which the time required to manufacture an elbow is reduced by omitting the inner diameter machining process and the generation of chip is reduced.

In order to accomplish the above object, there is provided a method of manufacturing an elbow according to the present invention, comprising the steps of: forming a first preliminary part by bending the pipe while forming a first bent part by pressing both ends and a point of a pipe; Wherein both ends of the first spare part are pressed harder than when the first spare part is formed and the one point is pressed weaker than when forming the first spare part so that the first bent part is formed as the second bent part, Forming a second spare part curved more than the spare part; Pressing both ends of the second spare part more strongly than when forming the second spare part and pressing the one point more weakly than when forming the second spare part so that the length between the upper and lower sides of the second bent part is shorter than the length between both sides Forming a third spare part formed on both sides of the protruded third bent part, the third spare part being bent more than the second spare part; The third bent portion presses the protruded both sides of the third bent portion without pressing both end faces of the third spare part and the one point so that the length of the third bent portion increases between the upper and lower planar surfaces, And forming a finished product curved more than the third spare part.

Further, the present invention is characterized in that the first spare part forming step is a step in which a pressing force applied to the one point is greater than a pressing force applied to both end faces, and the second spare part forming step includes: And the third spare parts forming step is a step in which the pressing force applied to both end faces is larger than the pressing force applied to the one point.

The present invention is characterized in that the step of forming the finished product is a step in which the diameter of one end and the other end of the through-hole of the finished product is formed so as not to be smaller than the inner diameter of the fourth bent portion.

According to another aspect of the present invention, there is provided an elbow comprising: a body having a hexagonal outer surface, the body including a first body and a second body connected to each other at an angle; A through hole formed in a longitudinal direction from one end to the other end of the body; and a bending portion connecting the first body and the second body, wherein the inner peripheral surface of the bending portion is a curved surface, And a lower portion of the bent portion is divided into one side and the other side by the line and the diameter of one end and the other end of the through hole is not smaller than the inner diameter of the connecting portion.

The method of manufacturing a curved tube elbow and a curved tube elbow according to the present invention has the following effects.

The type effect of the elbow is improved when the inner surface of the bent portion is formed as a curved surface, so that the vortex phenomenon generated inside the bent portion is improved. In addition, the flow of flow in the elbow is smooth, there is no load, and there is no noise. In addition, an elbow having various bending angles can be manufactured with one mold, that is, a manufacturing apparatus.

In addition, the intangible effect of the elbow is less vigorous in the bent portion of the elbow, thereby reducing the energy loss and increasing the efficiency. In addition, unlike the prior art, since the through holes of the elbows are not manufactured by drilling, chips are not generated therein, and burrs and cracks generated in the bent portions are improved. In addition, there is no environmental problem because cutting oil is not required to be used when working through the elbow. Also, unlike the prior art, drilling is not performed, and the elbow manufacturing time is shortened.

Further, since the outer surface of the elbow is hexagonal, both side surfaces with the marks can be securely held by the tool, and the elbow can be mounted on a manifold, a hose tube, and the like, thereby facilitating the installation.

1 is a sectional view of a conventional elbow;
Figure 2 is a partial side view and an entire cross-sectional view of an elbow of the present invention.
3 is a floor chart of an elbow manufacturing method of the present invention.
4A to 4D are schematic views showing the steps of the method for manufacturing an elbow according to the present invention.
Figures 5A-5D are cross-sectional views of the elbows of the present invention in an orderly fashion.
6 is a perspective view of an actual product according to an embodiment.
7 shows an example of use of the elbow according to the present invention.
8 is a graph showing changes in pressing force according to the bending angle of the present invention.
9 is a cross-sectional view of a curved tube elbow hose fitting according to another embodiment of the present invention.
Fig. 10 shows another example of the use of a curved tube elbow hose fitting.
11 is a partial cross-sectional view of a socket-type curved tube elbow, which is another embodiment.
Fig. 12 shows another example of the use of a socket-type curved tube elbow.

The same components as those of the conventional art will be described below with reference to the related art, and a detailed description thereof will be omitted.

===================== Elbow Manufacturing Method =====================

The embodiment of the method of manufacturing the elbow 1000 described below is described as using the manufacturing apparatus of Patent Document 1 described in the background art.

The method of manufacturing the elbow 1000 of the present embodiment is such that the pipe P is curved while both ends of the pipe P on which the through hole PH is formed and the point PO are pressed to form the first bent portion 1300a A step S110 of forming a first spare part E1 and a step of pressing both ends of the first spare part E1 harder than the case where the first spare part E1 forms a first spare part E1, (S120) in which the first bent part 1300a is formed as the second bent part 1300b and the second spare part E2 curved more than the first spare part E1 is formed, The two end portions of the spare part E2 are pressed harder than when the second spare part E2 is formed and the one point PO is pressed slightly weaker than when forming the second spare part E2 to form the second bent part 1300b, A third spare part E3 curved longer than the second side E3 and formed on both sides of the third bent part 1300c with a length shorter than the length between both sides, (E3) The third bent portion 1300c presses the protruded both sides of the third bent portion 1300c without pressurizing the first point B and the point PO so that the length of the third bent portion 1300c increases between the upper and lower planes, And a step S140 of forming a finished product E4 which is formed as a part 1300 and curved more than the third spare part E3.

Further, the present invention further includes a step of machining a male screw capable of fastening the other components to one side and the other side of the finished product E4.

On the other hand, in this embodiment, one point PO is approximately the middle part of the pipe P.

The finished product E4 manufactured through such a method, that is, the elbow 1000 has the following effects.

First, the type effect of the elbow 1000 is as follows: 1) When the end surface of the elbow 1000 is viewed, the inner circumferential surface 1320 of the bent portion 1300 is formed as a curved surface to improve the vortex phenomenon generated inside the bent portion 1300 . 2) Flow of the flow path is smooth in the elbow 1000, there is no load, and there is no noise. 3) An elbow 1000 having a variety of bending angles can be manufactured from one mold, that is, a manufacturing apparatus.

The intangible effect of the elbow 1000 is as follows. 1) The vortex phenomenon does not occur in the fourth bent portion 1300 of the elbow 1000, and the energy loss is reduced, thereby increasing the efficiency. 2) Unlike the conventional case, since the through hole 1400 of the elbow 1000 is not manufactured by drilling, chips are not generated therein, and burrs and cracks (cracks) generated in the bent portion 1300 Crack phenomenon is improved. 3) There is no environmental problem because cutting oil is not required to be used when machining the through hole 1400 of the elbow 1000. 4) Unlike the conventional method, drilling is not performed, and the time required to manufacture the elbow 1000 is shortened.

On the other hand, in the first spare part forming step S110, the upper and lower vertexes of the outer peripheral surface of the pipe P whose outer circumferential surface is a regular hexagon are located at the uppermost and lowermost ends, respectively, and both sides of the pipe P are straight One side of the pipe P and the other side of the pipe P are bent upward or downward to form a bent portion 1300a to be the first spare part E1. Therefore, the length of the pipe P between the upper and lower vertexes of the bending part, that is, the vicinity of the point PO and the point PO, becomes longer and the length becomes longer between the front and rear planes, and the bending part 1300a of the first spare part E1 . After the first spare part forming step S110, the first spare part E1 is formed as a finished product E4 through the same method. That is, in the manufacturing method of the elbow 1000, the pipe P and the spare parts E1, E2, and E3 are deformed while the positions of the upper corner and the lower corner are always located at the uppermost and lowermost positions.

On the other hand, as shown in Fig. 6, uneven MRs are formed on the front side plane and the rear side plane which are both side surfaces of the bent portion 1300d of the finished product E4. The station MR is formed by applying a side pressing force to the front side plane and the rear side plane which are both side surfaces of the bent portion 1300c of the third spare part E3 in the finished product forming step S140. The station MR is formed from one side to the other side of each side of the bending portion 1300d, but is formed on the lower side by a half area in the radial direction. Therefore, when the elbow 1000 is to be mounted on a manifold M or a hose tube T to be described later, it is easy to mount the elbow 1000 because both sides with the MR are securely held by the tool.

The first spare part E1 forming step S110 is a step in which the pressing force applied to one point PO is larger than the pressing force applied to both end faces of the pipe P and the forming step S120 of forming the second spare part E2, And the third spare part E3 forming step S130 is a step in which the pressing force applied to both end faces of the first spare part E1 is the same as the pressing force applied to the first point part PO, Is greater than the pressing force applied to the one point (PO).

More specifically, in the present embodiment, the first spare part E1 forming step (S110) is performed such that the pressing force applied to both end faces of the first spare part E1 is 5% of the total pressing force applied by the manufacturing apparatus, And the pressing force applied to the point PO is 95% of the total pressing force applied by the manufacturing apparatus. The second spare part E2 forming step S120 is a step in which the pressing force applied to both end faces of the second spare part E2 is 50% of the total pressing force applied by the manufacturing apparatus and the one point PO of the second spare part E2 ) Is 50% of the total pressing force applied by the manufacturing apparatus. The third spare part E3 forming step S130 is a step in which the pressing force applied to both end faces of the third spare part E3 is 90% of the total pressing force applied by the manufacturing apparatus and the one point PO of the third spare part E3 ) Is 10% of the total pressing force applied by the manufacturing apparatus. The step of forming a finished product (E4) (S140) is a step of applying 100% of the total pressing force applied by the manufacturing apparatus to both side surfaces of the third spare part (E3).

The pressing force value describes the final pressing force at each step.

More specifically, the pressing force changes during each manufacturing step. For example, in step S120 of forming the second spare part E2, the pressing force applied to both end faces of the first spare part E1 gradually increases from the value of 5% that makes up the first spare part E1, At the end of the forming step, the step ends with the target value of 50% being reached.

Fig. 8 is a graph of the pressing force prediction shown on the basis of this embodiment. On the left side, the numerical value of the pressing force is shown. On the lower side, the bending angle is shown. The line ① indicates the curved surface pressing force, the line ② indicates the section pressing force, and the line ③ indicates the side pressing force.

8 shows that the curved surface pressing force was 100% at the start of the manufacturing process, decreased as the manufacturing progressed, and became 0% at the completion of the forming step of the finished product (E4) (E4) forming step is completed, the side pressing force is increased from 0% at the start of the step of forming the finished product (E4), and the step of forming the finished product (E4) is completed 100%. ≪ / RTI >

On the other hand, the first spare part E1 forming step S110 is a step of forming the first spare part E1 by bending the unevenly bent pipe P to 30 degrees. That is, in this step, the first bent portion 1300a is formed by bending the upper and lower sides of the pipe P, respectively, at one point PO of the pipe P, and the first body 1100 and the second body 1200 And forming a first spare part E1 which is curved so as to face each other at intervals of 150 degrees.

When the first body 1100 and the second body 1200 form a pipe P at an angle of 180 ° with respect to the pipe P, the first spare part E1 is formed such that the first body 1100 and the second body 1200 are connected to each other 150 It is bent to face at intervals.

At this stage, the pipe P is bent from 0 DEG to 30 DEG to become the first spare part E1.

The second spare part E2 forming step S120 is a step of forming the second spare part E2 by bending the first spare part E1 to 45 degrees. That is, in this step, both sides of the first spare part E1 are bent upward at one point PO, the first bent part 1300a is formed as a second bent part 1300b, and the first body part 1100 and the second body 1200 are bent so as to face each other at 135 DEG intervals.

At this stage, the first spare part E1 is bent from 31 DEG to 45 DEG to become the second spare part E2.

The third spare part E3 forming step S130 is a step of forming the third spare part E3 by bending the second spare part E2 up to 90 degrees. That is, in this step, both sides of the second spare part E2 are bent upward in the direction of one point PO, the second bent part 1300b is formed as a third bent part 1300c, and the first body 1100 and the second body 1200 are bent so as to face each other at 90 DEG intervals.

At this stage, the pipe P is bent from 46 DEG to 90 DEG to become the third spare part E3.

The step of forming the finished product E4 S140 is a step of bending the third spare part E3 to 93 ° to form the finished product E4. In other words, this step is performed such that both sides of the third spare part E3 are bent upward in the direction of one point PO, the third bent part 1300c is formed as a fourth bent part 1300, 1100 and the second body 1200 are bent at an interval of 87 DEG.

At this stage, the third spare part E3 bends from 90 ° to 93 ° to become the finished product E4.

The reason why the third spare part E3 is bent to 93 degrees is because when the finished product E4 is spring-back after bending is completed, the third spare part E3 is returned to an angle smaller than 93 degrees. That is, the bending angle of the elbow 1000 to be manufactured is smaller than the maximum bending angle of 93 ° during the manufacturing process. Therefore, the present invention further comprises a step of reducing springiness by causing springback in the finished product (E4).

On the other hand, in the step of forming the finished product E4 (S140), the diameters A1 and A2 of one end and the other end of the through hole 1400 of the finished product E4 are not less than the inner diameter B of the fourth bent portion 1300 Is formed. Therefore, the present invention increases the efficiency because the vortex phenomenon does not occur in the fourth bent portion 1300 of the elbow 1000, and energy loss is reduced.

====================== Elbow Manufacturing Method Detailed Description ======================= =

Hereinafter, the above-described method of manufacturing the elbow 1000 will be described in more detail with reference to the drawings.

4A to 4D show one example of the manufacturing apparatus for manufacturing the elbow 1000 according to the present invention. The supporting molds 100 and 200, the compression members 300 and 400, and the point PO at which the bent portion 1300 is formed, And the deformation of the side molds 600 and 700 and the pipe P for causing the compression members 300 and 400 to rotate on an inclined surface are shown in a simplified manner.

In the following description, the pressing force refers to the pressing force of the manufacturing apparatus. That is, the 5% pressing force refers to a pressing force of 5% of the total pressing force of the manufacturing apparatus.

The method for manufacturing the elbow 1000 of the present invention is such that the pipe P in which the through hole PH is formed is positioned in the manufacturing apparatus so as to come between the compression members 300 and 400. At this time, both ends of the pipe P are formed as inclined surfaces at portions connected to the outer circumferential surface.

Thereafter, when the manufacturing apparatus is operated in this state, a pressing force of 5% is applied to both end faces of the pipe P, and a pressing force of 95% is applied to one point PO of the pipe P. Thus, one side and the other side of the pipe P are bent around the point PO and bent until the first body 1100 and the second body 1200 start at 0 DEG and are spaced by 150 DEG (S110 ). Through this step, the pipe P is formed as the first spare part E1 made up of the first bent part 1300a.

Thereafter, a pressing force of 50% is applied to both end faces of the first spare part E1, and a pressing force of 50% is applied to the first position PO. When one side and the other side of the first spare part E1 are bent around the one point PO and the first body 1100 and the second body 1200 start at 149 ° or 150 ° and are 135 ° apart (S120). Through this step, the first spare part E1 is formed as the second spare part E2 including the second bent part 1300b.

Thereafter, a pressing force of 90% is applied to both end faces of the second spare part E2, and a pressing force of 10% is applied to the first point PO. The third bent part 1300c having the length between the upper and lower sides of the second spare part E1 is shorter than the length between the opposite sides and the both sides are protruded, And the first body 1100 and the second body 1200 are bent at an interval of 90 占 starting from 134 占 or 135 占 S130. Through this step, the second spare part E2 is formed as a third spare part E3 including the third bent part 1300c.

Thereafter, a pressing force of 100% is applied to the protruded both sides of the third bent portion 1300c without pressing both end faces of the third spare part E3 and the point PO. Thus, one side and the other side of the third spare part E3 are bent around the point PO, and the third bent part 1300c is increased in length between the upper and lower planes and reduced in length between both sides, And the first body 1100 and the second body 1200 are bent from 90 degrees to 87 degrees apart (S140). Through this step, the third spare part E3 is formed of the finished product E4 including the fourth bent part 1300. [

In this step S140, the finished product E4 is formed so that the diameter A1 of one end of the through hole 1400 and the diameter A2 of the other end are not smaller than the inner diameter B of the fourth bent portion 1300 .

The first body 1100 and the second body 1200 of the finished product E4 are bent at 93 ° with each other through the step S140. However, if the time passes after the completion of the bending, The bending angle of the first body 1100 and the second body 1200 is returned to a value smaller than 93 占 and the elbow 1000 having the bending angle to be manufactured is obtained.

More specifically, when the first spare part E1 is compared with the pipe P, the first body 1100 and the second body 1200 each have a bent angle of 30 degrees, The spare part E2 has a bent angle of 45 degrees with respect to the first body 1100 and the second body 1200 respectively and the third spare part E3 has the first body 1100 and the second body 1200, The sum of the bent angles is 90 占 and the finished product E4 has the sum of the bent angles of the first body 1100 and the second body 1200 of 93 占.

In the manufacturing method of the present invention, after the manufacturing process as described above, male threads 1900a and 1900b are formed on outer surfaces of one side and the other side of the elbow 1000 to fasten the elbow 1000, It can be used as a fitting. The outer diameter of one side and the other side of the elbow 1000 in which the male threads 1900a and 1900b are formed is smaller than the outer diameter of the other portions.

As described above, in the present invention, the first bent portion 1300a formed by bending the pipe P is gradually deformed into the second bent portion 1300b and the third bent portion 1300c while the manufacturing process proceeds.

The cross section of the through hole PH is circular with a constant radius on the basis of the point PO when the pipe P is more detailed. However, the first spare part E1, the second spare part E2, the third spare part E3, The cross-section of the through-hole at one point (PO) of the cross-section is shorter than the cross-sectional shape before deformation, and the length of the cross-section becomes longer and becomes elliptical. That is, the third bent part 1300c of the third spare part E3 is flattened more vertically than the second bent part 1300b of the second spare part E2 and widened back and forth.

The outer circumferential surface of one point PO of the pipe P is regular hexagonal when viewed from the cross section, but the first spare part E1, the second spare part E2 and the third spare part E3 The outer circumferential surface of PO is shorter than the shape before deformation and the length of front and rear is longer and the length of sides is not the same. That is, the third bent part 1300c of the third spare part E3 is flattened more vertically than the second bent part 1300b of the second spare part E2 and widened back and forth.

On the other hand, in the third bent portion 1300c, the cross-section of the through-hole is oval with respect to the point PO, but the cross-section of the through-hole 1400 at one point PO of the finished product E4 has a constant radius It becomes a circle.

===================== Elbow Shape =====================

Hereinafter, the configuration of the elbow 1000 formed by the above-described manufacturing method will be described.

The elbow 1000 includes a body having a hexagonal outer surface including a first body 1100 and a second body 1200 connected to each other at an angle to each other and a bend connecting the first body 1100 and the second body 1200, And a through hole 1400 formed in the longitudinal direction from one end of the body to the other end.

Here, the bending portion 1300 refers to a state after the fourth bent portion 1300 of the finished product E4 manufactured by the above-described manufacturing method is deformed due to a springback phenomenon over time.

The angle formed by the first body 1100 and the second body 1200 in the present embodiment is the same as the center axis of the through hole of the first body 1100 and the center axis of the through hole of the second body 1200 And the angle formed by the central axis.

2, the outer peripheral surface of the bent portion 1300 is a curved line.

In addition, the bending portion 1300 has a curved surface on the inner peripheral surface 1320.

2, the inner surfaces 1120 and 1220 of the first body 1100 and the inner surface of the second body 1200 are straight lines, but the inner surface of the bent portion 1300 1320) is a curved surface. The length of both ends of the upper inner circumferential surface 1320a of the bent portion 1300 is shorter than the length of both ends of the lower inner circumferential surface 1320b.

On the other hand, the curvature of the upper inner circumferential surface 1320a and the curvature of the lower inner circumferential surface 1320b of the bent portion 1300 are the same.

The upper inner circumferential surface 1320a and the upper outer circumferential surface of the bent portion 1300 are curved by approximately 90 degrees from one end connected to the first body 1100 to the other end connected to the second body 1200. That is, the first body 1100 and the second body 1200 are connected at 90 ° to each other.

The bending portion 1300 has a line L parallel to the radial direction of the bending portion 1300 and a lower portion of the bending portion 1300 is formed by the line L .

This line L is formed when the bent portion 1300 is formed. That is, the line L does not exist when the pipe P is present, but the pipe P is formed in the folded portion while being formed by the elbow 1000. [ Therefore, the line L is generated at a point PO where the pressing force is applied when the elbow 1000 is formed.

Further, the line L has a recessed shape inside the elbow 1000. Accordingly, the lower side of the bending portion 1300 is formed with an angled portion in the bending portion 1300 while the side of one side divided by the line L and the side of the other side meet with the line L as a reference.

On the other hand, the outer circumferential surface of the bent portion 1300 of the elbow 1000 is hexagonal. The outer surface of the bent portion 1300 of the elbow 1000 has a front plane viewed from the side as viewed from the side as shown in Fig. 2, a rear plane positioned rearwardly, Two upper planes connected to the planes to meet each other to form upper corners, and two lower planes connected to the front and rear planes, respectively, which meet each other and form a lower corner.

The front side plane and the rear side plane of the bent portion 1300 are the side to which the side pressing force is applied among the third spare parts E3 in the finished product forming step S140. The traces MR formed on the front side surface and the rear side surface are formed from one side to the other side of the front side plane or the rear side plane, respectively, and are formed by the area of the lower half in the radial direction of the bending portion 1300. Therefore, both side surfaces of the elbow 1000 formed with a planar and uneven MR can be reliably held by the tool and installed on the manifold M, the hose tube T, and the like, so that the elbow 1000 can be easily installed.

The line L is formed in two of the lower planes. At this time, the line L is formed by the length of about half of the radial lengths of the respective lower planes. Thus, the radial length of the line L is similar to the radial length of one lower plane.

The through hole 1400 formed in the elbow 1000 is surrounded by the inner circumferential surface 1120 of the first body 1100 and the inner circumferential surface 1220 of the second body 1200 and the inner circumferential surface 1320 of the bent portion 1300 Formed Euro.

The inner circumferential surface 1120 of the first body 1100 and the inner circumferential surface 1220 of the second body 1200 and the inner circumferential surface 1320 of the bent portion 1300 are circular in cross section. Therefore, the cross section of the through hole 1400 at all positions of the elbow 1000 is circular with a constant radius.

One end and the other end of the through hole 1400 of the elbow 1000 are positioned at the end of the first body 1100 and the end of the second body 1200, respectively.

The diameter A1 and A2 of one end and the other end of the through hole 1400 of the elbow 1000 are not smaller than the inner diameter B of the bent portion 1300. [ More specifically, the diameters A1 and A2 of one end and the other end of the through-hole 1400 are set to be smaller than the diameters A1 and A2 of the bending portion 1400 in order to reduce energy loss and noise that may be generated as the fluid flows through the through- 1300) is preferably equal to or similar to the inner diameter (B)

=========================== Examples of Elbows and Other Explanations ================ ================

Meanwhile, the elbow 1000 can be used to connect the manifold M and the hose pipe T as shown in FIG. The male thread 1900a on one side of the elbow 1000 is connected to the hose pipe T so as to communicate with the flow path of the hose pipe T and the male thread 1900b on the other side of the elbow 1000 is formed on the manifold M And is connected to a hole formed in the outer surface of the manifold M so as to communicate with the flow path L. [

A connection portion to which the hose pipe T is connected is contacted to one side of the elbow 1000 and a nut N for maintaining contact between the connection portion C and the hose pipe T is fastened to the elbow 1000, And a ferrule F for maintaining the connection between the hose pipe T and the hose pipe T is provided in the hose pipe T. At this time, the through-hole of the hose pipe T and the through-hole 1400 of the elbow 1000 communicate with each other by the connecting portion C to form one channel.

On the other hand, a part of the male thread 1900b on the other side of the elbow 1000 is inserted into the hole of the manifold M and the nut N is fastened to the remaining part.

Further, a washer W is provided between the male thread 1900b and the manifold M.

A sealing member S is provided in a space surrounded by the washer W, the manifold M, and the male thread 1900b in the holes of the manifold M. [

On the other hand, the performance index of the elbow 1000 according to the present invention is based on two criteria: the first is the squareness, and the second is the cylindrical degree.

The squareness is checked based on the screw outer diameter of the finished product (E4), which is within 0.95 ° of KS B 1535.

The cylindrical shape is based on a cross sectional area of the bending portion 1300 that is not less than 80% of the cross sectional area of the conventional bending portion 1300 of the elbow 1000.

On the other hand, the present embodiment has been described on the basis that the length between the both end faces of the pipe P which is a regular hexagon is 60 mm, and the outer peripheral faces are 19 mm between the faces facing each other. Therefore, the numerical value of the step bending angle or the pressing force may be different depending on the dimension of the pipe (P).

=================== Curved Elbow Hose Fitting ===================

The curved pipe elbow hose fitting 2000 having the hexagonal outer circumferential surfaces shown in Figs. 9 and 10 is a fitting of a hose line to which hydraulic pressure is applied, and is used for a connection portion where fluid flow is changed.

First, the manufacturing method of the curved tube elbow hose fitting 2000 includes a step of preparing a pipe P having a through hole PH by cutting a hexagonal hollow material and a step of forming a first spare part to a finished product forming step S110, S120, S130, and S140) to manufacture the pipe P as a finished product E4. However, the fourth bent portion 2300, that is, the bent portion 2300 of the finished product E4 manufactured by the above-described method is formed at a position closer to one side than the central portion according to the shape of the curved pipe elbow hose fitting 2000 to be manufactured .

The method for manufacturing the curved tube elbow hose fitting 2000 includes the steps of machining one side of the finished product E4 in order to install the nuts N2 and the ferrules F2 after the finished product E4 is formed, Thereby forming a latching portion. Further, the other side of the finished product E4 is machined to form a latching portion for hooking the ferrule F2 on the outer circumferential surface, thereby completing the curved tube elbow hose fitting 2000.

Such a curved tube elbow hose fitting 2000 is provided with a nut N2 at one side and a ferrule F2 at the other side and connecting the nut N2 and the ferrule F2 to another tube or a hose tube, .

The curved tube elbow hose fitting 2000 manufactured by the above method has a first body 2100 on which a nut N2 is installed, a second body 2200 on which a ferrule F2 is installed, And a bent portion 2300 connecting the first body 2100 and the second body 2200. In the present embodiment, the length of the first body 2100 in the curved tube elbow hose fitting 2000 is about half the length of the second body 2200 in the lengthwise direction.

The curved tube elbow hose fitting 2000 of the present embodiment is formed such that the outer diameter of the bent portion 2300, that is, the thickness D thereof is made thick, so that the bent portion 2300 hardly ruptures.

Also, the curved elbow hose fitting (2000) is miniaturized.

In more detail, therefore, the curved tube elbow hose fitting 2000 has a shortest distance between one end and an imaginary line extending from the central axis of the second body 2200. Further, the curved tube elbow hose fitting 2000 is formed such that the shortest distance between the other end and the imaginary line extending from the central axis of the first body 2100 is short. Since the bending portion 2300 has a small radius of curvature, the length of the first body 2100 and the second body 2200 in the longitudinal direction of the curved tube elbow hose fitting 2000 is minimized. Therefore, the curved elbow hose fitting (2000) is miniaturized, which reduces material costs.

Further, the curved tube elbow hose fitting 2000 is improved in the phenomenon that noises are generated or pressure is lost when fluid flows through the through holes 2400.

10 shows an example of the use of a curved tube elbow hose fitting 2000. [

One side of the hose tube T is inserted into a space between the other side of the curved tube elbow hose fitting 2000 and the ferrule F2. The other end of the straight tube ST is fastened to the nut N2 on one side of the curved tube elbow hose fitting 2000 to be in contact with one side of the curved tube elbow hose fitting 2000. One side of the straight tube ST is inserted into the hole of the manifold M so as to communicate with the flow path L of the manifold M. [ The flow path L of the hose pipe T and the manifold M is communicated with the curved pipe elbow hose fitting 2000 through the straight pipe ST.

A sealing member S is inserted into the hole of the manifold M and a nut N is fastened to the outside of the straight tube ST so as to contact the outer surface of the manifold M and the sealing member S. [

The construction and effect other than those described above are the same as those of the above described curved tube elbows and curved tube elbows.

=================== Socket type elbow tube ===================

In another embodiment of the present invention, a socket type bending elbow 3000 having a hexagonal outer circumferential surface as shown in FIG. 11 may be connected to a bending elbow CL connected to the manifold M as shown in FIG.

A method of manufacturing a socket type bending elbow 3000 includes the steps of preparing a pipe having a through hole by cutting a hexagonal hollow material and forming a first spare part to a finished product forming step S110, S120, S130, and S140 in the elbow manufacturing method, And the pipe is made into a finished product.

After the finished product is formed, the socket type tubular elbow 3000 is formed by forming female threads 3110 and 3210 on one inner circumferential surface and the other inner circumferential surface of the finished product, respectively.

In the socket type bending elbow 3000 manufactured by the above-described method, a through hole 3400 is formed along the central axis in the longitudinal direction from one end to the other end.

The socket type bending elbow 3000 has a first body 3100 coupled to other parts, that is, a male thread of the bending elbow CL in FIG. 12, and a second body 3100 connected to the other side of the first body 3100, And a second body 3200 connected to the other side of the bending part 3300 and coupled to another part (not shown).

In the present embodiment, the socket-type curved tube elbow 3000 has the same shape as the first body 3100 and the second body 3200, unlike the other embodiments. More specifically, the outer diameter of the first body 3100 and the outer diameter of the second body 3200 are always constant. The longitudinal length of the first body 3100 and the longitudinal length of the second body 3200 are equal to each other.

In the socket type bending elbow 3000 of the present embodiment, the outer diameter of the bent portion 3300, that is, the thickness D thereof is made thick, and the bending portion 3300 hardly ruptures.

In addition, the socket type bending elbow 3000 is improved in the phenomenon that noises are generated or pressure is lost when fluid flows through the through holes 3400.

12, the female thread 3110 of the first body 3100 and the male threads of the curved tube elbow CL are coupled to each other to form a socket type curved tube elbow 3000 And the through hole of the curved tube elbow CL are communicated with each other.

A part of the other side of the curved tube elbow CL is inserted into the hole of the manifold M so that the curved tube elbow CL and the flow path L formed in the manifold M are communicated with each other, (N) is fastened. A washer W is installed between the other side of the curved line elbow CL inserted into the manifold M and the manifold M. [ A sealing member S is provided in a space surrounded by the other side of the washer W, the manifold M and the curved tube elbow CL among the holes of the manifold M. Therefore, the flow path L of the manifold M communicates with the through hole 3400 of the socket type bending elbow 3000.

The construction and effect other than those described above are the same as those of the above described curved tube elbows and curved tube elbows.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as set forth in the following claims Or modification of the invention.

** Explanation of key codes **
1000: Elbow 1100: First body
1120: first body inner circumferential surface 1200: second body
1220: second body inner circumferential surface 1300: fourth bend section
1320: fourth bend inner circumferential surface 1400: through hole
A1, A2: Through hole diameter (body) B: Through hole diameter (bending section)
E1: First spare part E2: Second spare part
E3: 3rd spare part E4: Finished product
P: pipe PO: one point
100, 200: support mold 300, 400: compression member
500: lifting member 600, 700: side mold

Claims (4)

Wherein the first bent part is formed by pressing both end faces of the pipe having the through-hole and the end point, and the pipe is curved to form the first spare part;
Wherein both ends of the first spare part are pressed harder than when the first spare part is formed and the one point is pressed weaker than when forming the first spare part so that the first bent part is formed as the second bent part, Forming a second spare part curved more than the spare part;
Pressing both ends of the second spare part more strongly than when forming the second spare part and pressing the one point more weakly than when forming the second spare part so that the length between the upper and lower sides of the second bent part is shorter than the length between both sides Forming a third spare part formed on both sides of the protruded third bent part, the third spare part being bent more than the second spare part;
The third bent portion presses the protruded both sides of the third bent portion without pressing both end faces of the third spare part and the one point so that the length of the third bent portion increases between the upper and lower planar surfaces, And forming a finished product curved more than the third spare part
The method according to claim 1,
Wherein the first spare part forming step is a step in which a pressing force applied to the one point is larger than a pressing force applied to both end faces,
The second spare part forming step is the same step as the pressing force applied to the both end faces and the pressing force applied to the one point,
Wherein the third spare part forming step is a step in which the pressing force applied to both end faces is larger than the pressing force applied to the one point
The method according to claim 1 or 2,
Wherein the step of forming the finished product is a step of forming the diameter of one end and the other end of the through-hole of the finished product so as not to be smaller than the inner diameter of the fourth bent portion
A body having a hexagonal outer surface including a first body and a second body connected to each other at an angle;
A through hole formed in the longitudinal direction from one end to the other end of the body;
And a bending portion connecting the first body and the second body,
The inner peripheral surface of the bent portion is a curved surface,
The bent portion has a line parallel to the radial direction at the lower center of the outer peripheral surface,
A lower portion of the bent portion is divided into one side and the other side by the line,
And the diameter of one end and the other end of the through-hole is not smaller than the inner diameter of the bent portion.

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