KR100870404B1 - Hanging groove forming device of support pipe - Google Patents

Abstract

The present invention relates to a locking groove forming apparatus for a support pipe forming a support rod of a headrest or a hand brake lever, and includes a pad 110 and a lower mold 120 having seating grooves 111 and 121 into which the pipe 10 is inserted / seated. ); A multi-stage punch (200) for forming a locking groove (2) on the outer circumferential surface of the pipe (10) while moving in a direction orthogonal to the longitudinal direction of the pipe (10) in a state penetrating the lower mold (120) horizontally; It comprises a moving means 300 for moving the multi-stage punch 200 in the orthogonal direction.

Therefore, when the multi-stage punch 200 is reciprocated, the multi-stage forming part 220 and the reverse molding part 230 gradually extend the locking groove 2 while crossing the pipe 10 to process the final shape. It is possible to prevent the occurrence of shear droop (shear droop = shear drop =; Re; 3) on the outer peripheral surface of the engaging groove (2) without using the It is possible to prevent a decrease in strength and the like and to form various shapes of the locking grooves.

Description

Fixing groove forming device for support pipe

1 is a cross-sectional view of the locking groove is formed in the support pipe (support rod),

Figure 2 (a) is a view for explaining a conventional locking groove forming apparatus,

(b) is a perspective view of a pipe in which a locking groove is formed by a conventional device,

(c) is a cross-sectional view of the locking groove forming state of the conventional device,

Figure 3 (a) is a cross-sectional view of a conventional state of forming the locking groove by inserting the core,

(b) is a perspective view of a pipe conventionally formed with a locking groove using a core,

Figure 4 is a configuration of the hook groove forming apparatus of the support pipe according to the present invention,

Figure 5 is shown from the back of Figure 4,

(a) is a pad and the lower mold separation state of the locking groove forming apparatus according to the present invention,

(b) is the pad and the lower mold combination state diagram,

6 is a perspective view of a pad and a lower mold combination state,

7 (a) is a perspective view and a cross-sectional view of a multi-stage punch;

(b) is an enlarged view of the forming end,

8 is a flow chart of the operation of the present invention engaging groove forming device,

(A), (b), (c) of FIG. 9 is a flow chart of work movement of a multi-stage punch;

10 is a cross-sectional view when forming the locking groove of the multi-stage punch and pipe,

Figure 11 (a), (b), (c) is a cross-sectional view of a pipe showing a locking groove that is completed step by step in accordance with the operation of the locking groove forming apparatus of the present invention,

12 (a), (b), (c), (d) is a cross-sectional view of the pipe showing the locking groove is completed step by step according to another operation method of the locking groove forming apparatus of the present invention,

13 (a) and 13 (b) are cross-sectional views illustrating embodiments of a locking groove formed in another shape.

* Description of the symbols for the main parts of the drawings *

2: hanging groove 10: pipe

110: pad 120: lower mold

111,121: Seating groove 121a: Opening hole

122: through hole 200: multi-stage punch

210: depression plane 220: multi-stage forming part

221,222,223: 1st, 2nd, 3rd molding part 221a, 222a, 223a: molding section

230: reverse molding part 300: moving means

310: lifting body 311: guide rail

320: first pressing member 330: second pressing member

335: backward inducing member 340: first hydraulic member

350: second hydraulic pressure and return member

The present invention relates to an apparatus for forming a groove in a pipe, and more particularly to an apparatus for forming a radially concave engaging groove in the outer peripheral surface of a circular pipe.

As shown in Figure 1, the support rod 1 of the head restraint or hand brake lever of the vehicle is formed with a plurality of engaging grooves (2) radially recessed in the outer circumferential surface at regular intervals, separately in the locking groove (2) The fastening means (ratchet mechanism) provided is engaged so that the headrest or the hand brake lever can be fixed at an arbitrary position.

In order to form the locking groove 2, as shown in FIG. 2 (a), the pipe 10 is fixed between the pad 11 and the lower die 12 of the press apparatus, and the pad 11 The punch 20 was vertically lowered through to press the outer peripheral surface of the pipe 10 to a predetermined depth.

The locking groove 2 formed by the above method has a flat bottom surface 2a, a vertical surface 2b on one side of the bottom surface 2a, and a gentle inclined surface on the other side of the bottom surface 2a, as shown in Fig. 2 (b). (2c), the fixing means is caught on the vertical surface (2b) to maintain the fixed state and to be inserted into or to be removed from the locking groove (2) while sliding to the inclined surface (2c).

However, when pressing the outer peripheral surface of the pipe 10 in the direction perpendicular to the radial direction by using the punch 20 to form the locking groove 2 as in the prior art, the locking groove 2 as shown in Fig. 2 (c). When the pressure molding is carried out, the outer surface portion of the vertical surface 2b is enclosed and a rounded curved portion, that is, a shear droop = shear drop = = れ; 3 is formed, whereby the area of the vertical surface 2b is As a result, the area in which the fixing means is reduced is reduced, so that the fixing means is easily separated from the locking groove 2, thereby reducing the position fixing performance.

Accordingly, as shown in FIG. 3 (b), the core 30 having the recessed groove 31 having the shape of the locking groove 2 is inserted into the pipe 10 and press is performed as shown in FIG. Although generation of the sear loop 3 was suppressed (prevented), a vertical surface 2b having a sufficient area could be secured, but in this case, the insertion and removal of the core 30 was added to decrease productivity and the vertical surface 2b. As the wall thickness of the thinner part is reduced, the strength is lowered, and thus, the material cost is increased by using the pipe 10 having a thick wall thickness in consideration of the decrease in the wall thickness in order to secure the necessary strength.

In addition, since the locking groove 2 is formed by the punch 20 that vertically descends from above, the angle of the vertical surface 2b of the locking groove 2 cannot be changed, so that the shape of the locking groove 2 is large. There was a downside.

Accordingly, the present invention has been made to solve the above problems, it is possible to suppress the generation of the shear loop without using the core, thereby reducing the fixed stability due to the generation of shear loop and productivity and strength due to the use of the core It is an object of the present invention to provide a locking groove forming apparatus for supporting pipes, which can prevent degradation, and also form various shapes of locking grooves.

The present invention for achieving the above object,

A pad and a lower mold having a seating groove in which a pipe is inserted and seated;

A multi-stage punch for forming a locking groove on an outer circumferential surface of the pipe while moving in a direction orthogonal to the longitudinal direction of the pipe while penetrating the lower die horizontally;

And moving means for moving the multi-stage punch in a direction orthogonal to the longitudinal direction of the pipe, wherein the seating recesses each have a clearance between the pad and the lower mold when the pad is fully lowered with respect to the lower mold. It is formed into an arc that is wider than a semicircle.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

Figure 4 is a configuration of the hook groove forming apparatus of the support pipe according to the present invention, the present invention is located on the pad 110 and the lower mold 120, the lower side of the pipe 10 for fixing the pipe 10 A multi-stage punch 200 that moves in a direction orthogonal to the longitudinal direction of the pipe 10 and forms a locking groove on its outer circumferential surface, and a direction in which the multi-stage punch 200 is orthogonal to the longitudinal direction of the pipe 10; It comprises a moving means 300 for moving in the left and right direction of the pipe (10).

Each of the pad 110 and the lower mold 120 is shown in (a) of FIG. 5 (FIG. 5 is the back of FIG. 4 and the position of the multi-stage forming portion 220 is reversed). Since the seating grooves 111 and 121 are formed on the lower surface and the upper surface of the pipe 10, the pad 10 is lowered after the pipe 10 is placed in the seating groove 121 of the lower mold 120. The pipe 10 is fixed in the seating grooves 111 and 121.

At this time, the seating grooves (111, 121) to accommodate the diameter (outer diameter) tolerance of the pipe 10 is not formed in an exact semi-circular shape equal to the radius of the pipe, but made of a wide arc-shaped surface, as shown in Figure 5 (b) When the 110 is lowered and the pipe 10 is pressurized and fixed, the clearance gap G is present between the pad 110 and the lower die 120.

Meanwhile, as shown in FIGS. 5A, 6B, and 6, the lower mold 120 includes a through hole 122 that is formed in a direction orthogonal to the longitudinal direction (axial direction) of the pipe 10. It is formed a plurality (the same as the number of the engaging grooves to be formed in the pipe) at a predetermined interval, the lower portion of the seating groove 121 is formed in a state that opens and crosses the through-hole 122. That is, an opening hole 121a communicating with the through hole 122 is formed under the seating groove 121.

Therefore, when the pipe 10 is placed in the seating groove 121 of the lower mold 120, the lower outer peripheral surface of the pipe 10 protrudes into the through hole 122 through the opening hole 121a.

Meanwhile, the multi-stage punch 200 is inserted into each of the through holes 122, and the multi-stage punch 200 is basically formed in the pipe 10 as shown in FIG. A shape of the locking groove 2 to be formed, that is, a bottom surface corresponding surface 201 corresponding to the center bottom surface 2a, a vertical surface 2b on one side and an inclined surface 2c on the other side, a vertical surface corresponding surface 202, The inclined surface corresponding surface 203 is formed.

In addition, the multi-stage punch 200 is a through-hole 122 through the opening hole 121a of the seating groove 121, as shown in Figs. 7 (a) and 5 (a), (b). ) A flat depression plane 210 is formed in the middle portion at a depth not in contact with the lower outer circumferential surface of the pipe 10 protruding into the inside, and one side of the engagement plane 210 is stepped in succession to form a multi-stage forming step. 220 is formed.

The multi-stage molding part 220 includes a first molding part 221, a second molding part 222, and a third molding part 223 whose height is gradually increased from the depression plane 210. May be increased or decreased when designed, and the molding part of the highest stage forms the same plane as the bottom surface corresponding surface 201, which is the top surface of the multi-stage punch 200.

Therefore, as the multi-stage punch 200 moves, side cross-sections of the first, second, and third molding parts 221, 222, and 223 directly deform the lower outer circumferential surface of the pipe 10 to form the locking groove 2. The side cross sections will be referred to as molding cross sections 221a, 222a, and 223a.

On the other hand, as shown in Figure 7 (b), the height (H) of each of the first, second, third molding parts (221, 222, 223), the inclination (θ) of each of the molding cross-sections (221a, 222a, 223a), The roundness of the rounded corners R of the molding sections 221a, 222a, and 223a is different from the pressing area when the first, second, and third molding parts 221, 222, and 223 sequentially press the lower peripheral surface of the pipe 10. Repeated tests have a preset value to prevent deformation from occurring. That is, it is suitably set at a level at which excessive deformation is not caused by one molding portion.

In addition, due to the formation of the indentation plane 210, an edge where the bottom surface corresponding surface 201 is cut is present at the opposite side of the portion where the multi-stage molding part 220 is formed, and the corner is the multi-stage punch. When the 200 moves forward in the forward direction and then moves backward, the burr generated on the opposite side of the multi-stage punch 200 in the advancing direction is removed or the burrs are not formed. It acts as a reverse molding unit 230 that serves to finalize the shape. In this case, the reverse molding unit 230 has the same height as that of the uppermost molding part of the multi-stage molding part 220, that is, the third molding part 223.

On the other hand, as shown in FIG. 4, the moving means 300 is the elevating body 310 and the elevating body 310, and the elevating body 310 of the elevating body by the drive unit of the press apparatus (since a detailed description is omitted) It is mounted on the guide rail 311 mounted on one side of the guide rail so as to be slidably moved in the front-rear direction parallel to the longitudinal direction of the pipe 10, and the moving direction when forming the locking groove 2 of the multi-stage punch 200 (left side in the drawing). To the right) side edge portion is formed with an inclined surface 321 is formed integrally on the first pressing member 320 and the other lower surface of the elevating body 310, the inclined surface 322 is also formed in the front corner of the lower end When the reverse movement of the multi-stage punch 200 (from right to left on the drawing) includes a second pressing member 330 in which the inclined surface 331 is formed on the side of the moving direction side.

In addition, an inclined protrusion 332 extending from the inclined surface 331 is formed at the lower outer end (right side of the drawing) of the second pressing member 330, and the top surface of the inclined protrusion 332 is also inclined surface 333. Is formed.

In addition, the moving means 300 is mounted on the end of the first pressing member 320 side of the multi-stage punch 200, the inclined surface 341 is pushed against the inclined surface 321 of the first pressing member 320 Inclination hole 351 is formed at the end of the first pressure member 340 and the second pressure member 330 side of the multi-stage punch 200 and the second pressure member 330 is inserted when the second pressure member 330 is lowered. The two side surfaces of the inclined hole 351 are formed through the second hydraulic pressure and return member 350 formed of the inclined surfaces 352 and 353 to be opposed to the two inclined surfaces 331 and 333 of the second pressing member 330, respectively. do.

In addition, lower and upper ends of both inclined surfaces 352 and 353 of the inclined hole 351 are formed in a vertical plane, respectively, so that the raising and lowering action of the second pressing member 330 can be performed stably.

In addition, the moving means 300 is located on the lower side of the first pressing member 320 and the front inclined surface (1) of the first pressing member 320 in the upper corner portion of the rear (left side in the left side view of Figure 4) ( And a reverse inducing member 335 having an inclined surface 336 which works against the surface 322.

In addition, the moving means 300 is the first pressure member 320 moved to the rear by the reverse inducing member 335 when the first pressure member 340 is raised to a position that does not interfere with the first hydraulic member 340 1 is provided with a return means for pushing the pressure member 320 back to the original position. The return means can be easily configured using conventional techniques, such as a hydraulic cylinder, a motor and a rack & pinion mechanism, detailed description and illustration are omitted.

The operation of the present invention will now be described.

8 (a) to (f) sequentially show the operating state of the apparatus of the present invention shown in Figure 4, the detailed description will be described with reference to Figure 4.

8 (a) shows that the lifting body 310 is first lowered in a state in which the pad 110 presses and fixes the pipe 10. In this state, the inclined surface 321 of the first pressing member 320 is removed. 1 is in contact with the inclined surface 341 of the hydraulic member 340.

Subsequently, when the first pressing member 320 is further lowered by the lifting body 1 as shown in FIG. 8 (b), the first hydraulic member 340 is moved in the horizontal direction by the interaction of the inclined surfaces 321 and 341. The multi-stage puncher 200 slides inside the through hole 122 of the lower mold 120 by pushing the multi-stage punch 200 while moving to the right (right side in the drawing), so that the multi-stage molded part 220 is lower than the pipe 10. The outer peripheral surface is pressurized and deformed to form the locking groove 2. (In the case of FIG. 8, the multi-stage forming part 220 is formed on the left side of the multi-stage punch 200).

Subsequently, the lowering of the first pressing member 320 continues as the lowering body 310 descends, and the lower front inclined surface 322 of the first pressing member 320 is formed of the reverse inducing member 335. By sliding against the upper rear inclined surface 336, the first pressing member 320 is retracted backward in a direction parallel to the pipe 10 along the guide rail 311 as shown in FIG. 1 out of the movement path of the hydraulic member 340. That is, the first pressing member 320 is reversed so as not to prevent the reverse movement of the first hydraulic member 340.

Subsequently, the second hydraulic pressure on the right side of the multi-stage punch 200 and the inclined surface 352 of the return member 350 are inclined on the inclined surface 331 of the second pressure member 330 simultaneously lowered with the first pressure member 320. The second body pressure and the return member 350 are pushed back in the opposite direction (left) by the action of the inclined surfaces 352 and 331 by lowering the lifting body 310 further in this state.

At this time, the burr generated when forming the locking groove 2 by the multi-stage forming unit 220 by the reverse forming unit 230 of the multi-stage punch 200 is removed, or when the burr does not occur Molding of the locking groove 2 is completed. (The two molding methods will be described separately below.)

When the generation of the locking groove 2 is completed through the reciprocating operation of the multi-stage punch 200 as described above, the first and second pressing members 320 and 330 simultaneously rise as the lifting body 310 rises. At this time, the upper inclined surface 333 of the inclined protrusion 332 of the second pressing member 330 works with the outer inclined surface 353 of the second hydraulic pressure and the return member 350 to guide the second hydraulic pressure and the return member 350. The multi-stage punch 200 is returned to the initial position as it is drawn to the state of 8 (d).

Subsequently, as shown in FIG. 8E, the elevating body 310 is further raised, and the pad 110 is released from the lower mold 120. At this time, the height of the first pressure member 320 is not caught by the first pressure member 340. When raised to the first pressing member 320 is moved back to the original position by sliding forward along the guide rail 311 again by the return means.

Finally, as the lifting body 310 is fully raised as shown in FIG. 8 (f), the first pressure member 320 and the second pressure member 330 are formed by the first hydraulic member 340 and the second hydraulic pressure and return member ( By sufficiently spaced apart from the 350 and the pad 110 is completely opened, the locking groove 2 can be removed from the press device the molded pipe 10.

Subsequently, another pipe is seated on the lower mold 120, and the above operations (a) to (f) are repeated.

In the apparatus of the present invention operated as described above, the locking groove 2 formed by the multi-stage punch 200 is formed as shown in FIGS. 9 to 12.

When the first hydraulic member 340 is pushed down by the first pressure member 320 in a state where the pipe 10 is located in the middle of the depression plane 210 as shown in FIG. 9A, the multi-stage punch 200 9b, the lower outer peripheral surface of the pipe 10 is first deformed by the first molding part 221 of the multi-stage molding part 220, and then the second molding part 222 The locking groove 2 is subsequently formed by the third molding portion 223 in accordance with the expansion of the pressing area.

That is, as the multi-stage forming part 220 proceeds in the same manner as in FIG. 10, the depth of the locking groove 2 is gradually deepened as shown in FIGS. 11 (a), 11 (b) and 11 (c). After the third molding part 223 is processed, the locking groove 2 is formed to have the same size and shape as the third molding part 223.

At this time, since a burr is formed at the edge portion of the moving direction of the engaging groove 2 formed in the pipe 10 by the forward movement of the multi-stage forming part 220 as described above, as shown in FIG. The burr is removed by moving the multi-stage punch 200 in the reverse direction to the state of FIG. 9C through the additional lowering of the second pressing member 330.

Through the above process, the locking groove (2) to which the fixing means (ratchet mechanism) can be caught on the outer circumferential surface of the pipe 10 is formed in a complete shape.

Meanwhile, the multi-stage punch 200 may allow the third molding part 223 to completely pass the pipe 10 to form the locking groove 2 as described above when the multi-stage forming part 220 moves forward. In this case, however, since the burr is formed as described above, the locking groove 2 may be formed in the same manner as in FIG. 12.

That is, as the first and second molding parts 221 and 222 progress, the locking grooves 2 are formed in the first and second parts as shown in FIGS. 12A and 12B as in the case of FIG. The three molded parts 223 only proceed to the center of the pipe 10 so as to leave the unmolded part 2a on the opposite side without completely forming the locking groove 2 as shown in FIG. 12 (c).

Subsequently, the reverse molding unit 230 deforms the other half of the unmolded part, that is, the unmolded part 2a, by passing the multi-stage punch 200 in the reverse direction. It is to form a locking groove (2) of a complete shape, such as).

In this case, there is an advantage that the burrs generated when the third molding part 223 completely proceeds in the forward direction are not generated at the source.

On the other hand, as described above, the lifting body 310 whether the third molding unit 223 passes the pipe 10 completely or moves only to the central position and then moves in the reverse direction when the forward movement of the multi-stage punch 200 is performed. Degree of descent), the dimensional relationship between the first pressure member 320 and the first pressure member 340, the relationship between their inclined surfaces (321, 341), and also the distance between the first pressure member 320 and the second pressure member 330 The detailed design specifications, such as the dimensional relationship between the second pressure member 330 and the second hydraulic pressure and return member 350, their inclined surfaces (331, 352), etc., are set appropriately in consideration of the relationship between each other in various aspects. Can be implemented.

On the other hand, the multi-stage molding portion 220 for pressing the locking groove 2 is formed in a multi-stage to minimize the transmission of the pressing force to a portion other than the locking groove 2 as described above is carried out stepwise molding and In addition, the height H of each of the molding parts, that is, the first, second, and third molding parts 221, 222, and 223, the inclination θ of each of the molding sections 221a, 222a, and 223a, and the round R of each corner, respectively. The degree of machining has a value set through repeated tests so that deformation does not occur in portions other than the pressurized area, and as a result of forming the locking groove 2, the outer surface of the pipe 10 and the vertical surface of the locking groove 2 as in the prior art ( 2b) The sear loop 3 does not occur in the connection portion.

Therefore, since the area reduction of the vertical surface 2b does not occur, the area in which the fixing means is secured is sufficiently secured so that the holding state of the fixing means is firmly maintained, thereby supporting the pipe 10, that is, the support rod 1 of the headrest or the hand brake lever. ) Will maintain a stable position adjusted by the user.

In addition, since the shear loop 3 does not occur as described above, there is no need to use the core 30 that has been used for the conventional prevention thereof, and thus, the insertion and removal of the core 30 is not necessary.

In addition, since the wall thickness of the vertical surface 2b, which occurs when the core 30 is used as described above, does not occur, a thicker pipe may be used for strength reinforcement in consideration of the reduction in the wall thickness. There is no need.

 On the other hand, as described above, the present invention does not form the shape of the locking groove by vertically lowering the punch, but the first shape of the locking groove while completing the shape of the locking groove while passing through the shape of the locking groove in the lateral direction of the pipe 10. By changing the shape of the second and third molding parts (221, 222, 223), it is possible to variously change the shape of the inner surface of the locking groove (2).

That is, a composite surface having an acute angle α1 or an obtuse angle α2 or an acute angle α1 and an obtuse angle α2 on the vertical plane corresponding surfaces 202 of the first, second and third molding parts 221, 222, and 223. By changing the shape as shown in Figure 13 (a) it can be formed variously the inclination of the vertical surface (2b) of the locking groove (2).

That is, in the related art, since it is molded by a vertically descending punch, it is not possible to form the angle of the vertical surface 2b at an acute angle α1, but according to the present invention, it is possible to form an acute angle α1, and also the acute angle α1. It is also possible to form a composite surface having both a plane and an obtuse angle α2 plane. Therefore, when the inner side of the vertical surface 2b is formed at an acute angle α1 and the outer side is formed at an obtuse angle α2 in the illustrated shape, it is possible to more effectively suppress the detachment of the fixing means, thereby obtaining a more secured locking state. .

Further, if necessary, wavy irregularities are formed on the bottom surface corresponding surfaces 201 of the first, second, and third molding parts 221, 222, and 223, so that the locking grooves 2 of FIG. The same wave-shaped unevenness | corrugation can also be formed in the bottom surface 2a. Such a shape can also be formed on the vertical surface 2b, of course.

As described above, according to the present invention, the occurrence of the shear loop can be suppressed without using the core, thereby reducing the phenomenon that the fixed strength is reduced due to the reduction in the area of the fastening means caused by the shear loop. It is possible to prevent the decrease in productivity due to the use of the core, there is no reduction in the wall thickness of the locking grooves due to the use of the core, so that there is no need to use a thick pipe in consideration of this has the effect of reducing the material cost.

In addition, since the punch progresses in a direction orthogonal to the longitudinal direction of the pipe to form the shape of the locking groove, there is an advantage in that the inner surface shape of the locking groove can be formed in various shapes.

In addition, the pipe wall thickness is not reduced by the formation of the locking groove as described above, there is an effect that the decrease in strength does not occur.

Claims (13)

A pad 110 and a lower mold 120 having seating grooves 111 and 121 in which the pipe 10 is inserted and seated; A multi-stage punch (200) for forming a locking groove (2) on the outer circumferential surface of the pipe (10) while moving in a direction orthogonal to the longitudinal direction of the pipe (10) in a state penetrating the lower mold (120) horizontally; A moving means (300) for moving the multi-stage punch (200) in a direction orthogonal to the longitudinal direction of the pipe (10); The seating grooves 111 and 121 have arcs wider than semicircles so that a clearance gap G exists between the pad 110 and the lower mold 120 when the pad 110 is fully lowered with respect to the lower mold 120. Hanging groove forming apparatus of the support pipe is formed. delete The method of claim 1, wherein the through hole 122 into which the multi-stage punch 200 is inserted into the lower die 120 has a longitudinal direction of the pipe 10 so as to cross-communicate with the lower mounting groove 121 of the lower die 120. Hanging groove forming apparatus of the support pipe, characterized in that formed at a predetermined interval according to. The method of claim 1, wherein the multi-stage punch 200 is characterized in that the upper surface is composed of a bottom surface corresponding surface 201, a vertical surface corresponding surface 202 and the inclined surface corresponding surface 203 corresponding to the shape of the locking groove (2) Hanging groove forming device of the support pipe to be. The method of claim 4, wherein the depression plane 210 is formed in the middle portion of the multi-stage punch 200, and the multi-stage forming part 220 is formed stepwise successively stepped on one side of the depression plane 210 is formed. Hanging groove forming device of the support pipe to the. The method of claim 5, wherein the multi-stage forming portion 220 is the first molding portion 221, the second molding portion 222 and the third molding portion 223 to increase in height step by step from the depression plane (210) And the third molding part 223 has the same surface as the bottom surface corresponding surface 201. The method according to claim 6, wherein the height (H) of each of the first, second, third molding parts (221, 222, 223), and the inclination (θ) of each of the molding cross-sections 221a, 222a, 223a, which are their side cross-sections, and the round (R) ) Machining degree is a groove forming apparatus for supporting pipes, characterized in that the processing degree is set to a value that does not cause deformation in the portion other than the pressing area when pressing the outer peripheral surface of the pipe (10). The method according to claim 5, due to the formation of the depression plane 210, the reverse molding portion 230 is formed on the opposite side of the multi-stage forming portion 220, the height of the reverse molding portion 230 is the multi-stage forming portion 220 Hanging groove forming apparatus of the support pipe, characterized in that the same as the uppermost forming part of). The method of claim 1, wherein the moving means 300 Lifting body 310, It is installed on the guide rail 311 of the lower surface of the lifting body 310, the sliding movement in the longitudinal direction of the pipe 10, the inclined surface 321 is formed in the forward movement direction of the multi-stage punch 200, the inclined surface at the lower front corner The second pressing member 320 is formed integrally with the first pressing member 320 and the other lower surface of the lifting body 310 and the inclined surface 331 is formed in the reverse movement direction of the multi-stage punch 200. 330, a first hydraulic member 340 mounted at one end of the multi-stage punch 200, and having an inclined surface 341 facing the inclined surface 321 of the first pressure member 320, and the multi-stage punch. The inclined hole 351 is mounted to the other end of the 200 and the second pressing member 330 is inserted therein, and an inner side surface of the inclined hole 351 is an inclined surface of the second pressing member 330. A second hydraulic pressure and return member 350 formed of an inclined surface 352 against the 331; A backward inducing member 335 positioned below the first pressing member 320 and having an inclined surface 336 formed at a rear upper edge thereof to face the front inclined surface 322 of the first pressing member 320; And supporting means for returning the first pressing member 320 forward when the first pressing member 320 is raised to a height that does not interfere with the first hydraulic member 340. Hanging groove forming device of the pipe. The method of claim 9, wherein the inclined protrusion 332 extending from the inclined surface 331 is formed on the lower outer side of the second pressing member 330, the inclined surface 333 is formed on the upper surface of the inclined protrusion 332 And an inclined surface 353 formed against the inclined surface 333 on the other inner surface of the inclined hole 351 of the second hydraulic pressure and the return member 350. . The method of claim 10, wherein the second hydraulic pressure and the return member 350, the groove groove forming apparatus of the support pipe, characterized in that the lower and upper ends of the inclined holes 351, both sides of the inclined hole (351) is formed in a vertical plane. The method according to claim 5, wherein the vertical surface-corresponding surface 202 of the multi-stage forming part 220 is any one of a composite surface consisting of an acute angle (α1) or an obtuse surface (α2) or an acute angle (α1) and an obtuse surface (α2) Forming groove forming apparatus of the support pipe, characterized in that to form a variety of vertical surface (2b) shape of the engaging groove (2). The method of claim 5, wherein the multi-stage forming portion 220 is characterized in that the wavy surface irregularities are formed on the bottom surface corresponding surface 201 to form irregularities on the bottom surface (2a) of the locking groove (2). Hanging groove forming device of the support pipe.

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