KR101688854B1 - Apparatus for manufacturing U-bolt - Google Patents

Abstract

The present invention relates to an apparatus to form a U-bolt, pressing a lower portion of a horizontal center of a circular rod through an upper portion of the circular rod using a lifting means from an initial process of bending a center of the circular rod in a U-shape through descending of a press forming member to a process of completely bending the center of the circular rod. As such, the present invention prevents a horizontal center of the circular rod from being moved toward a left side or a right side in the process of bending the circular rod in the U-shape in order to prevent a defect where the heights of both ends of the U-bolt are finished.

Description

[0001] Apparatus for manufacturing U-bolt [0002]

[0001] The present invention relates to a U-bolt forming apparatus, and more particularly, to a U-bolt forming apparatus in which a lower portion of a left-right center of a round bar is bent by a lifting / So as to prevent the left and right center of the round bar from being moved to the left or right side in the process of bending the round bar into a U shape so as to prevent a defect in which the height of both ends of the finished U bolt is changed, To a bolt forming apparatus.

In general, a U-shaped bolt (hereinafter referred to as a "U-shaped bolt") is used for various purposes. It is used for fixing a pipe to a ceiling frame or a plurality of superstructures It is used for various purposes such as fixing to a vehicle body.

The male bolt is configured such that the center thereof is bent in a U-shape and the threaded portions are formed at both ends thereof.

As an example of a conventional apparatus for manufacturing a male threaded bolt, an apparatus for manufacturing a conventional threaded bolt of the present invention has been improved. First, a "threaded bolt forming apparatus" Bolt forming apparatus ") as follows.

A conventional eutectic bolt forming apparatus includes a body; A mounting groove formed in the upper portion of the body for mounting the circular rod; a mold formed in the middle of the mounting groove so as to pass through the mounting groove; A round bar mount including a length adjuster for adjusting the length of the barrel; A round bar that is fixed to the firewood groove and has threaded portions at both ends thereof; A press which presses the round bar placed in the mounting groove from above to bend the round bar into a U-shape into the inside of the molding tool to form a U-bolt; A left bending portion disposed inside the left side of the body and pressing the left side surface of the U bolt while rotating about a rotation axis by a pressing force of the U bolt falling down by the press; And a right bending portion disposed inside the right side of the body and pressing the right side surface of the U bolt while rotating around a rotation axis by a pressing force of the U bolt falling down by the press.

And the left and right bending portions include a band body; And a contact portion rotatably installed on a rotary shaft of the band body and configured to face the outer circumferential surface of the U bolt to be in contact with the U bolt. When the U bolt presses the contact portion by the press, Rotating rotating pedestal; A pressing roller installed on one side of the rotary pedestal and pressing the side of the U bolt by the rotating force of the rotary pedestal when the rotary pedestal is rotated by the pressing force of the U bolt; And a spring which is installed between the band body and the other upper side of the rotary pedestal and rotates the rotary pedestal by elastic force when the U bolt is separated from the contact part of the rotary pedestal.

However, in the conventional ebola forming apparatus configured as described above, the center of the round bar is moved to the left or right in the process of bending the round bar into the U shape through the lowering of the molding die of the press, So that defects in which the height of both ends are varied are frequently generated.

Further, in the above-described conventional ebolat forming apparatus, in the process of bending the round bar into the U-shape through the downward movement of the molding die of the press, as both sides of the center are bent first and the center is finally bent, And a problem of frequent occurrence of defects formed by sharpness in the 'V' shape.

Korean Patent No. 1408459 entitled "U-bolt forming device"

Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art,

An object of the present invention is to provide a method and apparatus for pressing a lower portion of a center of a round bar by upward and downward pushing means during a process of completely bending the round bar from the initial stage of bending the center of the round bar through a U- The present invention provides a U-bolt forming apparatus that prevents the left and right center of the round bar from moving to the left or right during the process of bending the round bar in a U-shape, thereby preventing defects such that the height of both ends of the finished U- .

It is another object of the present invention to provide a method and a device for manufacturing a bar-shaped bar from an initial stage of bending a round bar into a U- And a center of the round bar is bent so that the U-shaped bolt can be bent in a U-shape at its center.

It is still another object of the present invention to provide a U-bolt forming apparatus capable of promptly mounting a round bar at an accurate position by having a position setting means for fitting the right end of a round bar to the right side of a forming portion.

Another object of the present invention is to make the center of the round bar into a U-shaped shape by making the height of the upper part of the circumferential arcuate groove of the two forming rollers constituting the left and right roller parts equal to the height of the upper end of the lifting / So that the center portion of the round bar can be pushed upwardly more firmly from the beginning when the U-bolt is bent.

It is a further object of the present invention to provide a method of adjusting a left and right position of a right roller section or a left and right roller section and adjusting a left and right position of a molding body so as to freely adjust a gap between left and right roller sections, U-bolt forming apparatus capable of forming a U-bolt.

It is another object of the present invention to provide a U-bolt forming apparatus capable of forming a U-bolt regardless of the length of a round bar by adjusting the fall height of the lifting / .

In order to achieve the above object, a "U-bolt forming apparatus" according to the present invention comprises: a main body including a forming part opened at an upper part; Left and right roller portions provided on the left and right sides of the forming portion and spaced apart from each other, each of the left and right roller portions being located in the forming portion and having a forming roller on which a round bar is raised; A press forming member provided at an upper middle portion between the left and right roller portions and being lifted and lowered by the lifting means; The upper end of the round bar is lowered to the lower part of the middle between the left and right roller parts, and the upper part is lowered from the beginning when the press forming member is bent downward at the center of the round bar to the U- And a lifting and depressing means for pressing the central lower portion upward to prevent lateral movement of the round bar.

The main body of the " U-bolt forming apparatus "according to the present invention includes a base plate having a center insertion groove into which a lower portion of the lifting / And a horizontal plate mounted vertically on the upper surface of the base plate and fixed to the upper and the rear of the horizontal plate so as to penetrate the elevating and lowering means, And a molding body including a straight plate.

The U-bolt forming apparatus according to the present invention is further provided with a position setting means for setting the installation position of the round bar by bringing the right end of the round bar into close contact with the right side of the forming unit.

In the "U-bolt forming apparatus" according to the present invention, a circumferential arcuate groove formed in an arc-shaped cross section is formed on the periphery of the forming roller, and the height of the upper end of the elevating / Is equal to or higher than the height of the upper portion of the base plate (2).

Further, the fixing means of the "U-bolt forming apparatus" according to the present invention is constituted by a movable fixing section for moving the molding body to the left and right, and on the left side of the front and rear vertical plates, And a plurality of through holes through which the bolts of the right roller portion are selectively passed are formed at left and right intervals on the right side of the front and rear vertical plates.

The movable fixing part of the "U-bolt forming device" according to the present invention is provided with a T-shaped groove formed in the center of the base plate in the left and right direction, and a T-shaped groove formed at the center of the horizontal plate, A T-shaped bolt inserted into the T-shaped groove and having a screw shaft projecting through the central horizontal elongated hole; and a T-shaped bolt inserted into the T- And a fixing nut portion fastened to the screw shaft of the bolt and pressing the upper portion of the horizontal plate to fix the horizontal plate.

The elevating and retracting means of the "U-bolt forming apparatus" according to the present invention is vertically erected and provided with a cylindrical shovel body at its lower portion, a pressing force is generated at the upper portion thereof, And a shock absorber comprising a gas shock absorber, a hydraulic shock absorber, or a spring shoe bar having a lifting rod.

The elevating and retracting means of the "U-bolt forming apparatus" according to the present invention further includes a height adjusting unit disposed at a lower portion of the shovel and capable of lifting and lowering the shovel body so as to adjust a descent height of the shovel .

According to the present invention configured as described above, during the process of completely bending the center of the round bar from the initial stage of bending the center of the round bar through the lowering of the press-formed member, the lower left- , It is possible to prevent the left and right center of the round bar from moving to the left or right side in the process of bending the round bar into the U shape and to prevent the defects that the height of both ends of the finished U bolt are changed, Can be minimized.

In addition, the present invention allows the U-shaped bolt to be bent in the center of the U-shape by bending the center of the round bar from the beginning when the round bar is bent in the U-shape, There is also an effect of preventing defects in advance.

Further, the present invention provides the position setting means that the right end of the round bar is closely attached to the right side of the forming portion, so that the round bar can be quickly installed at the correct position, There is also.

Further, according to the present invention, by making the height of the upper part of the circumferential arcuate grooves of the two forming rollers constituting the left and right roller parts the same as the height of the upper end of the lifting and depressing means, the center of the round bar is bent into a U- The U-bolt can be further reduced by pressing the central part of the round bar upward more firmly from the beginning.

Further, according to the present invention, since the left and right positions of the right roller portion or the left and right roller portions are adjusted and the left and right positions of the molding body are adjusted, the distance between the left and right roller portions can be freely adjusted, The U-bolts can be formed in a compatible manner regardless of the radius of the U-bolts.

Further, according to the present invention, the U-bolt can be formed regardless of the length of the round bar by adjusting the lowering height of the lifting / lowering means through replacement of the height adjusting shoe.

1 shows a U-bolt forming apparatus according to the present invention,
1A is a perspective view,
1B is a front view,
1C is a sectional view taken along the line BB of Fig. 1A.
Fig. 2 is a cross-sectional view taken along line AA of Fig.
2A shows a state before the U-bolt is formed,
FIG. 2B is an enlarged view of the EE line in FIG. 2A,
Fig. 2C shows the molding state of the U bolts.
3 is a cross-sectional view taken along line DD of Fig.
4 is a sectional view taken along line EE of Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Fig. 1 shows a U-bolt forming apparatus according to the present invention. Fig. 1a is a perspective view, Fig. 1b is a front view, and Fig. 1c is a sectional view taken along the line B-B in Fig. 2A is a sectional view taken along the line A-A of FIG. 1A, FIG. 2A shows a state before molding of a U bolt, FIG. 2B is an enlarged view of an E-E line in FIG. 2A, and FIG. 2C shows a molding state of a U bolt. FIG. 3 is a sectional view taken along the line D-D in FIG. 1a, and FIG. 4 is a sectional view taken along the line E-E in FIG. 1a.

As shown in the drawings, the U-bolt forming apparatus according to the present invention includes a main body 1 including a molded portion 15 having an open upper portion, Left and right roller portions 2a and 2b each having a forming roller 22 positioned on the forming portion 15 and having a round bar 10 mounted thereon, A press forming member 3 provided at an upper portion in the middle between the left and right roller portions 2a and 2b and an up and down pushing means 4 provided at a lower middle portion between the left and right roller portions 2a and 2b do.

The round bar 10 is a material for manufacturing U bolts through a U-bolt forming apparatus according to the present invention, and screw parts 20 are formed on both sides thereof.

The main body 1 is formed with a forming portion 15 and serves to fix the left and right roller portions 2a and 2b and the lifting and pressing means 4. The main body 1 has a base plate 11 having a central insertion groove 413b formed at an upper center thereof to receive the lower portion of the lifting and pressing means 4, And a molding body 12 fixed to the upper portion.

The molding body 12 includes a horizontal plate 13 mounted on an upper portion of the base plate 11 through a fixing means 16 and having the lift means 4 penetrated therethrough, And the front and rear vertical plates 14a and 14b, which are vertically provided on the front and rear sides of the front and rear sides of the body 10 and on which the molded part 15 is formed.

It is preferable that a position setting means 18 for setting the installation position of the round bar 10 is provided on the right side of the forming portion 15 with the right end of the round bar 10 being in close contact.

The position setting means 18 is provided on the right side of the front and rear vertical plates 14a and 14b so that the round bar 10 supplied from left to right can be quickly installed at an accurate position, A vertical plate 181 in which a horizontal through hole 181a communicating with the vertical hole 151 is formed and a protruding length of the left side through adjustment of the two nuts N through the horizontal through hole 181a can be adjusted And an upper setting bolt shaft 182 having a moving plate 182a provided with a nut N at the lower end thereof and a nut N provided at a lower portion of the moving plate 182, And a lower setting bolt shaft 183 provided with a fastening plate 183a to which the right end of the round bar 10 is closely attached.

Therefore, the present invention is advantageous in that the round bar 10 can be installed at a correct position promptly by having the position setting means 18 of the round bar 10 on the right side of the forming portion 15.

In addition, the fixing means 16 is preferably composed of a movable fixing part 17 so as to move the molding body 12 to the left and right. The left and right vertical plates 14a and 14b are provided on the left side of the left and right vertical holes 14a and 14b with bolts 21 of the left roller portion 2a, A plurality of through holes 142 are formed on the right side of the front and rear vertical plates 14a and 14b so as to allow the bolts 21 of the right roller portion 2b to pass therethrough, Is preferably formed.

The movable fixing part 17 includes a T-shaped groove 171 formed in the center of the base plate 11 in the left-right direction so as to move the molding body 12 as a whole left or right, A central horizontal elongated hole 172 formed at the center of the T-groove 13 so as to allow the horizontal plate 13 to move leftward and rightward, A T-shaped bolt 173 inserted through the center horizontal elongated hole 172 and protruding through the central horizontal elongated hole 172 and an upper portion of the horizontal plate 13 by being fastened to the screw shaft of the T- And a fixing nut portion 174 for fixing the flat plate 13. The nut may have a single nut, or a washer may be used at the lower portion of the nut and the nut. In the accompanying drawings, a nut and a washer are used together. .

If the distance between the left and right roller portions 2a and 2b is adjusted, the radius of the U-shaped bent portion of the U-bolt to be formed is changed, and the radius of the U- It is preferable to replace the molded member 3.

Accordingly, the present invention can be applied to the left and right roller portions 2b and 2b by adjusting the right and left positions of the right roller portion 2b or the left and right roller portions 2a and 2b and adjusting the left and right positions of the molding body 12 2a and 2b may be freely adjusted. Therefore, according to the present invention, by freely adjusting the distance between the left and right roller portions 2a and 2b, U-bolts can be formed to be compatible with each other regardless of the length of the round bar 10 or the length of the radius of the U- There is also an advantage to be able to do.

In order to prevent the left roller portion 2a from being moved to the left side while finely adjusting the position of the left roller portion 2a mounted on the left horizontal long hole 141, A horizontal tapped hole 141a is formed. It is preferable that the tap hole 141a is further fastened with a movement preventing bolt 141b whose right end is in close contact with the shaft portion 211 of the bolt 21.

1 to 4, the left roller portion 2a and the right roller portion 2b each have a forming roller 22 located in the forming portion 15, (10) to support both sides.

Each of the left roller portion 2a and the right roller portion 2b having such a role penetrates the front and rear vertical plates 14a and 14b so as to firmly support the side portion of the round bar 10 A shaping roller 22 mounted in an idling position in the middle of the bolt 21 and positioned in the shaping section 15; And a fixing nut 23 which is fastened to the bolts 21 and fixes the bolts 21.

When the right roller portion 2b is mounted to the through hole 142 at the other position, the fixing nut 23 fastened to the shaft portion 211 of the bolt 21 is loosened and the forming roller 22 and the bolt 21 The bolts 21 and the shaping rollers 22 are attached to the through holes 142 at different positions and then the fixing nuts 23 are fastened again to change the position of the right roller portion 2b You can. When the position of the left roller portion 2a is changed, the fixing nut 23 is loosened, the position of the bolt 21 is changed in the left horizontal long hole 141, and the fixing nut 23 is tightened again It is possible to change the position of the left roller portion 2a.

It is most preferable that the periphery of the shaping roller 22 is formed as a circumferential arcuate groove 221 formed in an arc-shaped cross-section so that the round bar 10 can be lifted up without flowing back and forth.

1 and 2, the press-formed member 3 is provided at an intermediate portion between the left and right roller portions 2a and 2b, and is elevated and lowered through the elevating means 31 And serves to bend the center of the round bar 10 into a U-shape.

It is preferable that the press-formed member 3 having such a role is formed as a circular plate having a knob.

The elevating means 31 serves to raise and lower the press-formed member 3, and it is preferable to use a conventional hydraulic press apparatus capable of slowly lowering and raising the press-formed member 3.

As shown in FIGS. 1 and 2, the lifting and lowering means 4 includes a lower portion at the middle between the left and right roller portions 2a and 2b so as to be vertically movable, The upper end is lowered while the member 3 is lowered downward and is bent from the beginning when the center of the round bar 10 is bent into the U shape and the lower end of the round bar 10 is pressed upward, Thereby preventing the leftward /

The upward and downward pushing means 4 is vertically erected and has a cylindrical shovel body 411 at its lower portion and a pressing force is applied to the upper portion thereof to press the central lower portion of the round bar 10 upward The shovel 41 may be a gas shock absorber, a hydraulic shock absorber, or a spring shovel having a lifting rod 412. The shock absorber 41 may be a gas shock absorber, a hydraulic shock absorber, or a spring- And description thereof is omitted. Further, the upper portion of the lifting rod 412 may be further provided with a replaceable pushing cap which can be replaced by fastening screws.

The elevating and lowering means 4 further includes a height adjusting unit 413 disposed at a lower portion of the shovel 41 and capable of lifting and lowering the shovel body 411 so as to adjust a descent height of the shovel 41 can do.

The height adjuster 413 includes a vertical tube 421 in which an insertion groove 413b for inserting the shovel body 1 is formed and a lower portion thereof is closed, And a lifting rod 422b which is provided at a lower portion thereof and has a cylindrical shoebe body 422a and a pressing force is applied to the upper portion of the shoebe body 413 so as to press the lower portion of the shovel body 411 of the shovel 41 upward. And a height adjusting shovel 422 composed of a shovel, a hydraulic shovel or a spring shovel. It is preferable that the height adjustment shoe 422 is selected by using a height adjustment shoe 413 having different elevation heights of the elevation rod 422b according to the length of the U-bolts to be formed.

Therefore, according to the present invention, the U-bolt can be formed regardless of the length of the round bar 10 by adjusting the descent height of the lifting / lowering means 4 through replacement of the height adjustment shoe 413.

In order to further reduce the failure of the U-bolt by pressing the central lower portion of the round bar 10 upward from the beginning of bending the round bar 10 in the U-shape, It is most preferable that the height of the upper end of the pressing means 4 is equal to or higher than the height of the upper part of the circumferential arcuate groove 221 of the forming roller 22.

Hereinafter, the U-bolt forming apparatus according to the present invention will be described.

As shown in FIGS. 1 to 4, when a U-bolt is manufactured by using the U-bolt forming apparatus according to the present invention, two U-bolts are formed on the two forming rollers 22 provided on both sides of the forming section 15 The lower portion of the round bar 10 is brought into close contact with the upper end of the lifting rod 412 provided on the hydraulic shovel 41 as the round bar 10 is placed on the upper portion.

Next, the elevating means 31 is operated through an external operation to lower the press-formed member 3 located at the upper center of the round bar 10. During the process of completely bending the round bar 10 from the initial stage of bending the center of the round bar 10 to the U shape through the lowering of the press-formed member 3, the lower portion of the center of the round bar 10, The left and right center of the round bar 10 is prevented from moving to the left or right in the course of bending the round bar 10 into a U shape.

Next, as described above, when the center of the round bar 10 is completely bent in the U-shape through the complete lowering of the press-formed member 3, the press-formed member 3 is moved upward by external operation U to complete the forming mold of the bolt.

In the process of completely raising the press-formed member 3 from the U-bolt to the upper portion as described above, the lifting rod 412 of the hydraulic shock absorber 41 positioned at the lower center of the U-bolt is automatically moved The U-bolts are discharged to the upper part in the forming part 15. As shown in Fig. Therefore, the present invention also has an advantage that the drawing of the completed U-bolt is automatically performed.

Accordingly, during the process of completely bending the round bar 10 from its initial stage of bending the center of the round bar 10 to the U-shape through the lowering of the press-formed member 3, The left and right center of the round bar 10 is prevented from moving to the left or right in the course of bending the round bar 10 into the U shape as the bar bar 10 is pressed upward through the upper end 4 of the U bar, Which is a useful invention that can reduce the defects of the U-bolts to be formed to a minimum.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is clear that the present invention can be suitably modified and applied in the same manner. Therefore, the above description does not limit the scope of the invention defined by the limitations of the following claims.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention.

1: Body
11: base plate
12: Molded body
13: Horizontal plate
14a: front vertical plate 14b: rear vertical plate
141: Left horizontal long hole, 141a: Tapped hole, 141b: Movement prevention bolt,
142: Through hole
15:
16:
17:
171: T-shaped groove, 172: Central horizontal long hole, 173: T-shaped bolt,
174: Fixing nut part
18: Position setting means
181: vertical plate, 181a: horizontal through hole
182: upper setting bolt shaft, 182a: moving plate,
183: Lower setting bolt shaft, 183a: Clamp plate
2a: a left roller portion, 2b: a right roller portion
21: Bolt
211:
22: forming roller
221: Circumferential arc groove
23: Fixing nut
3: Press forming member
31: elevating means
4: lifting and depressing means
41: Hydraulic Shoba
411: Shoeback body, 412: Lift rod,
42:
421: Vertical tube, 422: Height adjustment shovel,
422a: Shoe bar body, 422b: Lift rod
N: Nut
10: Round bar
20:

Claims (12)

A body (1) comprising a forming part (15) with an open top;
Right and left roller units 22a and 22b each having a shaping roller 22 disposed on the left and right sides of the forming unit 15 and spaced apart from each other and positioned at the forming unit 15 and having a round bar 10 mounted thereon, (2a) (2b);
A press-formed member 3 provided at an intermediate portion between the left and right roller portions 2a and 2b and lifted and raised through the lifting means 31;
The upper end of the press-formed member 3 is lowered to the lower portion of the lower portion of the middle between the left and right roller portions 2a and 2b to bend the center of the round bar 10 in a U- Lifting and pressing means 4 for pressing the central lower portion of the round bar 10 upward to prevent the bar 10 from moving horizontally while the top is lowered during the entire bending process from the beginning;
/ RTI >
And a position setting means 18 for setting the installation position of the round bar 10 by the right end of the round bar 10 closely attached to the right side of the forming portion 15,
The position setting means (18)
A vertical plate 181 on which a horizontal through hole 181a communicating with the forming unit 15 is formed;
The protrusion length of the left side can be adjusted through the engagement of the two nuts N through the horizontal through hole 181a and the moving plate 182a provided with the nut N A setting bolt shaft 182;
And is provided with a tightening plate 183a provided at a left end thereof with a right end of the round bar 10 to closely contact with the lower end of the moving rod 182a, A setting bolt shaft 183;
And the U-bolt forming device.
The method according to claim 1,
The main body 1
A base plate 11 having a center insertion groove 413b through which a lower portion of the lifting and pressing means 4 is inserted;
And a horizontal plate 13 mounted on an upper portion of the base plate 11 through a fixing means 16 so that the lifting and pressing means 4 penetrates the upper and lower sides of the horizontal plate 13, A molding body 12 vertically provided with a front and rear vertical plates 14a and 14b between which the molding part 15 is formed;
And the U-bolt forming device.
delete delete 3. The method of claim 2,
Each of the left roller portion 2a and the right roller portion 2b,
A bolt 21 including a shaft portion 211 passing through the front and rear vertical plates 14a and 14b,
A shaping roller 22 mounted in the middle of the bolt 21 so as to idle and located in the shaping section 15,
A fixing nut 23 fastened to the shaft portion 211 of the bolt 21 to fix the bolt 21,
And the U-bolt forming device.
6. The method of claim 5,
A circumferential arcuate groove 221 formed in an arcuate cross section is formed around the forming roller 22,
And the height of the upper end of the lifting and lowering means (4) is equal to or higher than the height of the upper portion of the circumferential arcuate groove (221) of the forming roller (22).
6. The method of claim 5,
The fixing means 16 comprises a movable fixing portion 17 for moving the molding body 12 to the left and right,
A left horizontal elongated hole 141 through which the bolt 21 of the left roller portion 2a passes is formed on the left side of the front and rear vertical plates 14a and 14b,
A plurality of through holes 142 are formed on the right side of the front and rear vertical plates 14a and 14b so as to allow the bolts 21 of the right roller portion 2b to pass therethrough, U bolt forming device.
8. The method of claim 7,
A horizontal tap hole 141a is formed on the left side of the left horizontal long hole 141,
Wherein a bolt (141b) for fastening the right end of the bolt (21) to the shaft portion (211) of the bolt (21) is further tightened to the tapped hole (141a).
8. The method of claim 7,
The movable fixing part (17)
A T-shaped groove 171 formed in the center of the base plate 11 in the lateral direction,
A central horizontal elongated hole 172 formed at the center of the horizontal plate 13 to extend horizontally through the lifting and lowering means 4 so as to enable horizontal movement of the horizontal plate 13,
A T-shaped bolt 173 having a head portion inserted into the T-shaped groove 171 and a screw shaft extending through the central horizontal long hole 172,
A fixing nut portion 174 fastened to the screw shaft of the T-shaped bolt 173 and pressing the upper portion of the horizontal plate 13 to fix the horizontal plate 13,
And the U-bolt forming device.
The method according to any one of claims 1, 2, 5, 6, 7, 8, and 9,
The lifting / lowering means (4)
And a lifting rod 412 which is vertically erected and has a cylindrical shoeback body 411 at its lower portion and a pressing force is generated at an upper portion thereof to press the central lower portion of the round bar 10 upward, A shovel (41) composed of a shovel or a spring shovel,
Wherein said U-bolt forming device is a U-bolt forming device.
11. The method of claim 10,
The lifting / lowering means (4)
A height adjusting unit 413 disposed at a lower portion of the shovel 41 and capable of lifting and lowering the shovel body 411 so as to adjust a descent height of the shovel 41,
The U-bolt forming device further comprising:
12. The method of claim 11,
The height adjustment unit 413
A vertical tube 421 having an insertion groove 413b into which the shaver body 411 is inserted,
A cylindrical pushing body 422a is provided at the lower portion of the insertion groove 413b and a pressing force is applied to the upper portion of the pushing body 413 so that the lower portion of the pushing body 41 of the pushing- A height adjusting shovel 422 composed of a gas shock absorber, a hydraulic shock absorber or a spring shoe bar having a lifting rod 422b for pressing the lifting rod 422b,
And the U-bolt forming device.

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