KR20010093650A - divice for molding embossing lug of steel pipe - Google Patents

Abstract

PURPOSE: Provided is an apparatus making embossing projection easily on metal pipes around the round surface in order that the pipes with different embossing designs are utilized in various uses such as handles and steps to prevent slipping. CONSTITUTION: The apparatus comprises: a frame(1) having a detachable core of certain length(3) fixed horizontally at the upper part with insert hole at the center along the axis; many core holes perpendicular to the insert hole around a part of the above core; first fixed stand(5) at a certain place of the upper part of the frame; fist mobility generator(6) in the first fixed stand(5), being fixed perpendicular to the length direction of the core(3), making it possible to move inside and outside; fist moving stand(7) covering around the core holes which closes to the direction of core or opens to the opposite side of core(3) according to the first mobility generator(6); a casing(9) fixed with screw for detachment if necessary, moving inside and outside direction perpendicular to core(3) and acting as outside die to make embossing projection around the metal pipe(8); many casing holes on the above casing(9) confronting core holes and a punch inserted into each core hole and outside end of which is changed into form of half circle, cone, triangle and star according to the wanted embossing projection of the metal pipe(8).

Description

Device for molding embossing lugs of metal pipes

The present invention relates to an apparatus for forming an embossing protrusion around a metal pipe, and more particularly, to form an embossing protrusion having a specific shape on the circumferential surface of the metal pipe by using a metal pipe produced at a pipe production plant. The present invention relates to an embossing protrusion forming apparatus for a metal pipe.

In general, commercially available metal pipes are used for guiding the transport of various liquids and gases or are widely used as components of various structures.

In other words, the use of metal pipes such as scaffolding of the structure, props and handles of building railings, guide rails of various buildings, handles of vehicles and buildings, and frames of various structures (ladders, chairs, etc.) is incredibly diverse. Accordingly, there is an urgent need for the development of peripheral technologies that can be used for secondary purposes by processing metal pipes secondaryly.

In particular, when using a metal pipe formed with embossed projections on the circumferential surface as a scaffold of the structure, the embossing projections play a non-slip role, ensuring safety in use, and embossing when used with various handles or frames. It is very effective in many ways because the projections play a role of preventing slipping and acupressure, as well as securing a variety of design variations.

However, until now, no device for forming embossing projections on the circumferential surface of the metal pipe has been developed, and only a plurality of recess grooves are formed on the circumferential surface by using a rotating roll mold. It was mostly.

In some cases, the embossed projection is once formed on a plate-shaped metal sheet and then rolled into a cylindrical shape to produce a metal pipe having an embossed projection. In this case, when the plate-shaped metal sheet on which the embossed projection is formed is rolled into a cylindrical shape, As the embossing projection part is frequently bent, the defective rate increases, and even after manufacture, both contact parts of the metal sheet form a boundary line in the longitudinal direction, which is not good for aesthetic appearance, and there is also a risk of safety accident due to the minute gap formed in the boundary line part during use. It is not widely spread.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object thereof is to enable a plurality of embossing protrusions to be easily formed on the circumferential surface of the metal pipe by using the metal pipe that is already shipped.

1 is a perspective view showing the device of the present invention

Figure 2 is a plan view showing the device of the present invention

3 is an exploded perspective view showing the main configuration of the present invention

Figure 4a is a cross-sectional view of the main portion showing the operating state of the present invention, a state diagram before inserting the metal pipe to be formed in the embossed projection to the core

Figure 4b is a cross-sectional view of the main part showing the operating state of the present invention, a state in which the metal pipe to be formed to be embossed projection is inserted into the core

Figure 4c is a cross-sectional view showing the main portion of the operating state of the present invention, a state in which a plurality of casing, which is the outer mold to hold the metal pipe sandwiched in the core is held.

Figure 4d is a cross-sectional view of the main portion showing the operating state of the present invention, a state in which the plunger is inserted into the insertion hole of the core to form the embossed projection on the metal pipe

FIG. 5 is an enlarged view of a portion “A” of FIG. 4C, showing a state before the punch formed in the core through-hole of the core forms the embossed protrusion in the metal pipe; FIG.

FIG. 6 is an enlarged view of a portion “B” of FIG. 4D, in which a punch provided in a core through-hole of a core is formed of an embossing protrusion on a metal pipe; FIG.

7 is a cross-sectional view taken along the line II of FIG. 4B.

8 is a cross-sectional view taken along the line II-II of FIG. 4C.

Figure 9 is an exploded perspective view showing one side fixed part component of the core in the device of the present invention

10 is a perspective view showing a part of a metal pipe formed by embossing projection according to the present invention.

Explanation of symbols for the main parts of the drawings

1. Frame 2. Insertion hole

3. Core 4. Core Through Hole

5. 1st fixing base 6. 1st moving force generating member

7. First mobile platform 8. Metal pipe

8a. Embossing process 9. Casing

10. Casing through hole 11. Fixed frame

12. Lower Fixing Piece 12a. Lower groove

13. Upper fixing piece 13a. Upper groove

14. Punch 14a. The great neck

14b. Small neck 14c. bend

15. Step 16. Covering pipe

17. Opening of the covering pipe 18. Second fixing station

19. Second moving force generating member 20. Second moving table

21. Plunger 22. Moving Ring

23. Slope of movable ring 24. Slope of plunger

25. Controller

According to an aspect of the present invention for achieving the above object, a frame supported on the ground, the core of a predetermined length is formed in the center of the axial direction insertion hole is detachably fixed to one end in a horizontal state on the upper surface of the frame, A plurality of core through holes formed in a direction orthogonal to an insertion hole formed in the core on a portion of the peripheral surface of the core, a first fixing stand fixed to the upper surface of the frame, and a length of the core fixed to the first fixing stand and the frame A plurality of first moving force generating members for generating a moving force in an inner and an outer direction perpendicular to the direction, and installed inside the first moving force generating members to receive the moving force generated by the first moving force generating members. The first movable force moving inward and outward and the first movable force being detachably fixed to each of the first movable bases while covering the core through hole forming portion of the core. A casing spaced apart from the core while being inwardly contacted with the core or spreading in the opposite direction according to the operating state of the generating member, and a plurality of casing through holes formed to face each of the core holes formed in the core on the inner surface of each casing; Punches inserted into each core hole formed in the core to form embossed projections on the metal pipes fitted to the core while being selectively received and moved by a forced pressing force in an outward direction, and punches inserted into the respective core holes of the core; Punch escape preventing means for preventing the separation from the inner and outer direction, a second fixing stationary fixed to one side of the upper surface of the frame spaced apart from the first fixing station, and fixed to the second fixing station, the longitudinal direction of the core A second moving force generating member for generating a moving force in the inner and outer directions, and generating the second moving force It is installed inside the ash and receives the movement force generated by the second movement force generating member to move in and outward direction, and is separably fixed to the second movement stage is formed in the core during the movement of the second movement stage Provided is an embossing projection forming apparatus for a metal pipe, comprising a plunger which horizontally moves inward and outward along an insertion hole to select and push a punch inserted into each core through hole of the core in an outward direction perpendicular to the axial direction of the core.

Hereinafter, with reference to the accompanying Figures 1 to 10 showing the present invention as an embodiment in more detail as follows.

1 is a perspective view showing the apparatus of the present invention, Figure 2 is a plan view showing the apparatus of the present invention, Figure 3 is an exploded perspective view showing the main configuration of the present invention.

4A to 4D are cross-sectional views of main parts showing an operating state of the present invention, FIG. 5 is an enlarged view of a portion “A” of FIG. 4C, FIG. 6 is an enlarged view of a portion “B” of FIG. 4D, and FIG. 7 is a view of FIG. It is sectional drawing along the II line of FIG. 4B, and FIG. 8 is sectional drawing along the II-II line of FIG. 4C.

And Figure 9 is an exploded perspective view showing a component of one side fixed part of the core in the component of the present invention, Figure 10 is a perspective view showing a part of the metal pipe formed by embossing projection according to the present invention.

Hereinafter, the configuration of the embodiment of the present invention in detail.

According to the present invention, there is a frame (1) supported on the ground, and one end of a core (3) of a predetermined length having an insertion hole (2) formed in an axial direction at the center of the frame is detachably fixed in a horizontal state. A plurality of core through holes 4 are formed in a portion of the circumferential surface of the core so as to communicate in a direction orthogonal to the insertion holes 2 formed in the core 3, and the core 3 is disposed at an upper surface of the frame 1. The first fixing stand 5 is fixed to the first fixing stand 5, and the first moving force is formed on the first fixing stand and the frame 1 so as to generate a moving force in an inner and an outer direction perpendicular to the longitudinal direction of the core 3. The generating member 6 is fixed, and each of the first moving force generating members has a core (in accordance with an operating state of the first moving force generating member 6 in a state in which the core through hole 4 forming portion of the core 3 is wrapped. 3) a first moving table (7) is installed so as to retract toward or open toward the opposite side of the core, and the first The base is moved inward and outward orthogonal to the core 3 together with the first moving table 7 to serve as an external mold for selectively forming the embossing projection 8a on the circumferential surface of the metal pipe 8. The casing 9 is detachably fixed by a screw, and the casing 9 is formed with a plurality of casing through holes 10 facing each core through hole 4 formed in the core 3.

Since the core 3 should be replaceable at any time by a core having a size corresponding to the diameter size of the metal pipe 8 to form the embossing projection 8a, one end of the core 3 may be replaced with the frame 3. It is fixed to the upper surface in a detachable state, which has a fixing frame 11 fixed to the upper surface of the frame 3, the fixing frame has a lower groove 12a of a size corresponding to the diameter of the core 3 to be used The lower fixing piece 12 is fixed by a screw, and the lower fixing piece 12 has an upper fixing piece 13 having an upper groove 13a of a size corresponding to the diameter of the core 3 to be used, and is fixed by the screw. One end of (3) is possible as it is positioned in a state sandwiched between the lower fixing piece 12 and the upper fixing piece 13.

Each core through hole 4 formed in the core 3 is selectively received a forced pressing force and moved in an outward direction perpendicular to the core 3 while being embossed on the metal pipe 8 fitted to the core 3. The punch 14 is retractably fitted to form 8a), and the punch 14, which is retractably fitted into each core through hole 4 of the core 3, is separated inward and outward by punch release preventing means. Is always accommodated in the core through hole 4.

On the other hand, the punch 14 fitted into each core through hole 4 of the core 3 has a hemispherical shape, a cone shape, and a triangular pyramid shape depending on the shape of the embossing projection 8a to be formed at its outer end to the metal pipe 8. It can be applied to a specific shape such as a star shape.

In the above-described configuration of the embodiment of the present invention, the punch release preventing means includes a large diameter portion 14a that forms the outer side of the punch 14 and a small diameter portion 14b that forms the inside of the punch 14 while being smaller than the large diameter portion; Steps 15 formed in the vicinity of the insertion hole 2 in each of the core through holes 4 formed in the core 3 to catch the large diameter portion 14a of the punch 14 and the core 3 A thin covering tube 16 wrapped in an airtight state to include the core through hole 4 forming portion in the outer circumferential surface, and a covering tube in communication with each core through hole 4 formed in the core 3. 16 is formed in the cover tube through-hole 17 having a diameter slightly smaller than the diameter of the core through-hole so that only the end of the large diameter portion 14a of the punch 14 can be exposed to the outside. The covering tube 16 in which the through hole is formed prevents the punch 14, which is fitted in the core through hole 4 of the core 3, from escaping outward. Since the components if only to prevent a punch (14) by the other component is escaping through holes in the core (4) of the core (3) outside the ssuium tube (16) is not required.

The second fixing stand 18 is fixed to one side of the upper surface of the frame 1 spaced apart from the first fixing stand 5, and the moving force in the inner and outer directions of the core 3 is longitudinally fixed to the second fixing stand. The second movement force generating member 19 is fixed to generate a second movement, and the second movement is moved inside and outside the second movement force generating member to receive the inner and outer movement force of the second movement force generating member 19. The base 20 is installed, and each core formed in the core 3 is moved along the insertion hole 2 of the core 3 when the inside of the second moving table 20 moves in and out of the second moving table 20. A plunger 21 is fixed to select and press the punch 14 in the through hole 4 in the outward direction perpendicular to the axial direction of the core 3, and the outer periphery of the core is fixed to the core 3. The moving ring 22 is inserted to move inward and outward along the surface, and the moving ring 22 is moved at both ends of the inner circumferential surface of the moving ring when the moving ring 22 moves. The moving ring inclined surface 23 is formed so as not to interfere with the punch 14 fitted in each core through hole 4 of).

The plunger inclined surface 24 is formed at the opposite end portion of the plunger 21 opposite to the fixed portion of the second movable table 20 to be centrally gathered, and is pressed outward by the plunger 21 to move. The end portion of the small diameter portion 14b of the punch 14 is smoothly rounded, and the curved portion 14c is formed, which is interrupted when the plunger 21 moving inwardly is in contact with the punch 14. This is to avoid getting caught.

Meanwhile, among the components of the present invention, the first moving force generating member 6 and the second moving force generating member 19 may be any one of the hydraulic cylinder, the pneumatic cylinder, and the ball screw rotating according to the driving of the motor as necessary. It is understood that it is possible to select and apply, but in the embodiment was to use a hydraulic cylinder.

Further, in the embodiment of the present invention, the cylindrical metal pipe 8 has a circular shape with a core 3, a casing 9 for selectively wrapping the core, and a plunger 21 fitted into the insertion hole 2 of the core 3 in a circular shape. Although the embossing projection 8a can be formed on the circumferential surface thereof, the embossing projection 8a may be formed, but the present invention is not limited thereto, and the embossing projection may be formed on the circumferential surface of the polygonal metal pipe by using them as polygons instead of circles.

Each of the hydraulic cylinders of the first moving force generating member 6 and the second moving force generating member 19 among the components of the exemplary embodiment of the present invention is connected to the control signal of the controller 25 attached in place of the frame 1. It will be understandable to follow along.

Referring to the operation of the present invention configured as described above is as follows.

First, in the initial state before the embossing projection 8a is formed on the circumferential surface of the metal pipe 8 by the apparatus of the present invention, as shown in FIG. The moving ring 22 which is moved in the outward direction perpendicular to the axial direction, the second movable table 20 is moved in the axial direction of the core 3 and is fitted to the outer circumferential surface of the core 3. ) Is moved to the opposite end of the fixing part of the core 3 on the left side of the drawing.

On the other hand, the punch 14 fitted in each core through hole 4 formed in the core 3 is separated in the gravity direction by its own weight, considering that the core 3 maintains a horizontal state. 14 consists of a large diameter portion 14a constituting the outer side and a small diameter portion 14b constituting the inner side, and the large diameter portion of the punch 14 is adjacent to the insertion hole 2 in the inside of each of the core through holes 4. Steps 15 are formed so that 14a) is caught, and part of the outer peripheral surface of the core 3 including the core through hole 4 forming part is enclosed in an airtight state by a thin covering tube 16. In the covering tube, the covering tube through-hole 17 having a diameter slightly smaller than the diameter of the core through-hole 4 is formed in communication with each of the core through-holes 4 formed in the core 3. Punch (1) inserted into the core through hole of each of the through holes (4) of 3) is caught by the step (15) inside The punch 14, which is inserted into the lower core through hole of each core through hole 4 of the core 3, as well as does not escape to the insertion hole 2 forming part in the direction, is caught by the covering tube 16 to the outside. There is no escape in the direction.

The covering tube 16 having the covering tube through hole 17 is a component for preventing the punch 14 inserted into the core through hole 4 of the core 3 from escaping outward. The covering tube 16 is not necessarily necessary so long as 14 does not allow it to escape outward from the core through hole 4 of the core 3.

That is, instead of wrapping the outer circumferential surface of the core 3 with the covering tube 16 so that the punch 14 inserted into the core through hole 4 of the core 3 cannot escape outward, the core through hole of the core 3 is wrapped. (4) The outer periphery may be slightly retracted toward the center so that the core through diameter of the down part is smaller than the core through diameter of the remaining part.

In the state before operating the device of the present invention, as shown in FIG. In the following operation, the moving ring 22 is also moved by the metal pipe 8 when the metal pipe 8 to be formed is moved to the left in the drawing and inserted into the core 3 in the following operation. It is to be moved together while being pushed so that the front end of the metal pipe is not interfered in a right angle to the punch 14 fitted in each core through hole 4 of the core 3 in any case.

In the state in which the movable ring 22 fitted to the core 3 is moved to the left in the drawing opposite to the stationary part of the core 3, the cylindrical metal pipe 8 is moved by using artificial force or a separate device. When the metal pipe 8 is moved inward toward the right side in the drawing toward the core 3, the metal pipe 8 is fitted to the core 3 as shown in FIG. 4B while pushing the movable ring 22, and the metal pipe 8 is inserted into the core 3. In the state fitted to the core 3, the punch 14 fitted into each core through hole 4 of the core is wrapped in a state protected by the metal pipe 8.

In the above, before the metal pipe 8 is inserted into the core 3, the movable ring 22 fitted to the core 3 is moved to the opposite end of the fixing part of the core 3, or it is fitted to the core. When the movable ring 22 moved to the left is moved to the right side in the drawing by the metal pipe 8, the movable ring 22 of the punches 14 fitted in the core through holes 4 of the core 3. Since the punch of the portion is in contact with the inner diameter of the moving ring and moved inward toward the insertion hole 2 of the core 3, the moving ring 22 is continuously moved by the metal pipe 8 as described above. Since the punch 14 is moved inward, the metal pipe 8 does not interfere with the punch 14 at right angles, and in any case, the moving ring 22 also has an inner diameter portion of the moving ring in the moving process. Punching due to moving ring inclined surface 23 formed at both ends Interference with (14) does not happen at all.

On the other hand, the movement ring 22 for moving the punch 14 inward when the metal pipe 8 is fitted to the core 3 is not necessarily necessary, but if so, the metal pipe 8 is the core 3. It can be understood that the insertion is smooth and smooth without interference with the punch 14 in the process of being fitted to the core. If the moving ring 22 is not fitted to the core 3, the core ( The core according to the end shape (same shape as the embossing protrusion to be formed on the metal pipe) of the large diameter portion 14a of the punch outwardly caused by its own weight among the punches 14 fitted in the core through holes 4 of 3). It is understood that the fitting may be interrupted while the tip of the metal pipe 8 fitted in (3) contacts the large diameter portion 14a of the punch 14 at a right angle.

In this way, when the metal pipe 8 is fitted to the core 3, if one of the operation buttons provided on the controller 25 selects one operation button for operating the first moving force generating member 6, the frame The first moving force fixed to the first fixing stand 5 and the frame 1 fixed to the upper surface of the (1), respectively, to generate a moving force in the inner and outer directions perpendicular to the longitudinal direction of the core (3) The hydraulic cylinder, which is the generating member 6, operates under the control signal of the controller 25 to generate a moving force in an inward direction perpendicular to the core 3, so that the inside and the frame 1 of the respective first fixing tables 5 Each of the first movable bases 7 installed in the state of being positioned at the upper portion of the first movable bases 7 is moved in and out toward the core 3 by receiving the inward movement force by the hydraulic cylinder. Casing (9) is fixed to the inner side of the Therefore, at some point, each casing presses at a constant pressure while covering the core through hole 4 formed in the core 3 as a whole in the metal pipe 8 sandwiching the core 3 as shown in FIG. 4C. Accordingly, the metal pipe 8 to be embossed 8a is formed between the core and each first movable table 7 in the state of being fitted to the core 3.

On the other hand, in the state as shown in FIG. 4C, each punch 14 inserted into the core through hole 4 of the core 3 is moved inwardly by the metal pipe 8 to form the insertion hole 2 of the core 3. At this time, the curved portion 14c, which is the end of the small diameter portion 14b of the punch 14, is all exposed to the insertion hole 2 formed in a horizontal state at the center of the punch 14 as shown in FIG. There is.

Thereafter, when one of the operation buttons provided in the controller 25 selects one operation button for operating the second movement force generating member 19, the second fixing stand 18 fixed to the upper surface of the frame 1 The hydraulic cylinder, which is the second moving force generating member 19 fixed to the inside, operates by receiving the control signal of the controller 25 to generate the moving force in the inward direction, the left side of the drawing, so that the inside of the second fixing stand 18 The second movable table 20 installed in the state of moving to the core 3 receives the inward moving force by the hydraulic cylinder, and at this time, the plate fixed to the second movable table 20 is moved. The launcher 21 is moved along the core through hole 4 of the core 3 in the inward direction to the right in the drawing, and in this process, the plunger 21 is disposed at the end of the small diameter portion 14b of each punch 14. As contacted, the respective punches 14 are directed outwardly perpendicular to the longitudinal direction of the core 3 as shown in FIG. 4D. Each punch 14 which is moved under a forced pressing force and is moved outwardly has a thin covering tube 16 covering the core through hole 4 formed portion of the outer peripheral surface of the core 3 in an airtight state. Each of the punches is provided in the covering pipe, when the covering pipe hole 17 having a diameter smaller than the diameter of the core hole is formed in communication with each core hole 4 formed in the core 3. (14) does not escape to the outside of the core 3 but only a portion of the end of the small diameter portion (14b) is pushed outward to press the metal pipe (8) outward.

Therefore, the casing 9 fixed to each first moving table 7 is formed with the casing through-hole 11 facing the core through-hole 4 formed in the core 3, so that the periphery of the metal pipe 8 In this case, the embossing projection 8a that fits the end shape of the large diameter portion 18b of the punch 14 is protruded as shown in FIG. 8.

In the above-described embodiment of the present invention, the operator selects each operation button provided in the controller 25 to operate the first movement force generating member 6 and the second movement force generating member 19. The operation of the second moving force generating member 19 after the operation of the first moving force generating member 6 may be automatically performed by the controller 25 without selecting a separate operation button by the operator.

On the other hand, when the plunger 21 is in contact with the inner end of each punch 14 in the process of moving inwardly in the left direction along the core through hole 4 of the core 3 of the plunger 21 The opposite end of the fixing portion is formed with a plunger inclined surface 24, and the end portion of the small diameter portion 14b, which is the inner end of the punch 14, is formed with a smoothly rounded curved portion 14c. It is understood that the movement is smooth without interrupting the movement of the punch 14 and stopping.

After the molding of the embossing projection 8a on the metal pipe 8 by the apparatus of the present invention as described above, the metal pipe 8 on which the embossing projection is formed must be removed from the core 3, in this case The present invention is performed in reverse as when forming the embossing projection (8a) on the metal pipe (8).

In the case where the embossing projection 8a is continuously formed on the metal pipe 8 by the apparatus of the present invention, and the embossing projection 8a is to be formed on another metal pipe having a different diameter of the metal pipe 8, the core 3 ), And each casing 9 and plunger 21 should be exchanged to a size suitable for the diameter of the other metal pipe. The exchange of the core 3 is fixed to the upper surface of the frame 3. The lower fixing piece 12 having the lower groove 12a corresponding to the size of the core to be replaced after separating the lower fixing piece 12 from the lower fixing piece 12 and the upper fixing piece 13 from the lower fixing piece After selecting and fixing it to the fixing frame 11 as a screw, the upper fixing piece 13 having the upper groove 13a corresponding to the size of the core to be replaced with the core 3 therebetween is selected and the lower fixing piece ( 12) may be fixed by screws.

The embossing projection 8a is formed in the metal pipe 8 fitted to the core 3 by moving the punch 14 fitted in each core through hole 4 of the core 3 outward among the embodiments of the present invention. Preferably, the plunger 21 has a permanent magnet at the end of the plunger inclined surface 24, which is the opposite end of the fixing part, so that the plunger 21 inserts the insertion hole 2 of the core 2 into the permanent magnet. Accordingly, the pressing force applied to the punch 14 after the punch 14 is moved in the outward direction perpendicular to the core 3 so that the embossing projection 8a is formed on the metal pipe 8 is moved inward. When the plunger 21 is moved outward again to release the pressure, the punch 14 made of a magnetic material is moved inwardly toward the insertion hole 2 of the core 3 by magnetic force. When the metal pipe 8 formed with the embossing projection 8a is taken out of the core 3 There's so easy to pull out as luggage.

On the other hand, although not described in the operation of the embodiment of the present invention, when fixing one side of the core 3 to the frame (1) and the casing (9) to each of the first movable table (7) before the core ( The core through hole (4) formed in the 3) and the casing through hole (10) formed in each casing (9) should be exactly facing each other, one way to one side of each casing (9) to the first moving table (7) The outer positioning hole 26 is formed in each casing 9 of the outwardly exposed portion, and the core 3 has an outer positioning hole 26 formed in each casing 9. ) Positioning pins 28 to the inner positioning holes 27 through the outer positioning holes 26 before fixing the core 3 and the casing 9 so as to face the inner positioning holes 27. ) How to fit them.

Therefore, the present invention can selectively form various types of embossing projections on the circumferential surface of the shipped metal pipes, so that the metal pipes formed with the embossing projections can be used for various purposes such as scaffolding of structures, various handles and frames. In addition, the use of the anti-slip effect, as well as the diversification of the design can be varied depending on the intended use.

Claims (8)

A frame supported on the ground, One end is detachably fixed to the upper surface of the frame in a horizontal state and a core having a predetermined length formed in the center of the insertion hole in the axial direction, A plurality of core through holes formed in a portion of the circumferential surface of the core so as to communicate in a direction orthogonal to an insertion hole formed in the core; A first fixing stand fixed to the upper surface of the frame, A plurality of first moving force generating members fixed to the first fixing frame and the frame and generating a moving force in an inner and an outer direction perpendicular to the longitudinal direction of the core; A first moving table installed inside each of the first moving force generating members and receiving a moving force generated by the first moving force generating member to move inward and outward; The core through hole forming portion of the core is separably fixed to each of the first moving tables so as to move inwards according to the operating state of the first moving force generating member to be in airtight contact with the core or to be spaced apart from the core. Casing, A plurality of casing through holes formed to face each of the core through holes formed in the core on the inner surface of each casing; A punch for being embossed into each core through hole formed in the core to selectively receive a forced pressing force in an outward direction and to move the punch to form an embossing protrusion on the metal pipe fitted to the core; Punch release preventing means for preventing the punches inserted into the respective core through holes of the core from being separated in the inner and outer directions; A second fixing stand fixed to one side of the upper surface of the frame spaced apart from the first fixing stand; A second moving force generating member fixed to the second fixing stand to generate a moving force in an inner and an outer direction in a longitudinal direction of the core; A second moving table installed inside the second moving force generating member and receiving a moving force generated by the second moving force generating member to move inward and outward; The punch is inserted into each core hole of the core while being horizontally moved inward and outward along the insertion hole formed in the core when the second carrier is moved and detachably fixed to the second carrier, in an outward direction perpendicular to the axial direction of the core. Embossing projection forming apparatus for metal pipes, characterized in that consisting of a plunger to push. The method of claim 1, A fixing frame is fixed to the upper surface of the frame, and a lower fixing piece having a lower groove sized for the diameter of the core to be used is fixed to the fixing frame by screws, and the lower fixing piece has an upper groove sized for the diameter of the core to be used. The upper fixing piece having a screw embossed projection forming apparatus characterized in that the one end of the core is separably fixed as the one end of the core is positioned between the lower fixing piece and the upper fixing piece. . The method of claim 1, Core release prevention means, A punch comprising a large diameter portion that forms an outer side and a small diameter portion that forms an inner portion smaller than the large diameter portion, and is formed here in the vicinity of an insertion hole in each core through hole formed in the core so that the large diameter portion of the punch is caught. And a covering tube of a thin thickness surrounding the core through hole forming portion in the outer circumferential surface of the core in an airtight state, and a covering tube in communication with each of the core through holes formed in the core, so that only a large diameter end of the punch is formed. Embossing projection forming apparatus of the metal pipe, characterized in that the cover is further provided with a through hole having a diameter slightly smaller than the diameter of the core through hole to be exposed to the outside. The method of claim 3, wherein An embossing projection forming apparatus for a metal pipe, characterized in that the end of the large diameter portion forming the outer side of the punch is any one of a hemispherical shape, a circular shape, a triangular pyramid shape, and a star shape. The method of claim 1, The first moving force generating member and the second moving force generating member is any one of a hydraulic cylinder, a pneumatic cylinder, a ball screw rotating according to the drive of the motor, the embossing projection forming apparatus of the metal pipe. The method according to claim 1 or 3, The opposite end of the plunger is formed with a plunger inclined surface to be gathered into the center portion, and the small diameter end of the punch inserted into each core hole of the core is smoothly rounded to form a curved portion so that the plunger presses the punch. Embossing projection forming apparatus of the metal pipe, characterized in that the punching so as not to interfere with the punch in the process of moving inward. The method of claim 1, The moving ring is fitted to the core so as to be movable inward and outward, and the inclined surfaces of the moving ring are formed at both ends of the inner circumferential surface of the moving ring, respectively. The method of claim 6, An embossing projection forming apparatus for metal pipes, wherein the punch is a magnetic material, and the plunger inclined surface of the plunger is a permanent magnet.