KR102435586B1 - Press bending machine for bending pipes of automobile muffler at various angles, and pipe bending method using the same - Google Patents

Abstract

The press bending machine according to the present invention is capable of bending the pipe of the automobile muffler at various angles. By installing the LM guide between the slide piece (flow mold) and the counter die, it slides against the counter die that rotates outward during bending. By allowing the piece (flowing mold) to slide relatively, it has the advantage of preventing scratches on the surface of the pipe, improving the appearance of the pipe, and extending the life of the mold.

Description

A press bending machine for bending the pipe of the automobile muffler at various angles, and a pipe bending method using the same {Press bending machine for bending pipes of automobile muffler at various angles, and pipe bending method using the same}

The present invention relates to a press bending machine for a pipe of an automobile muffler, and more specifically, by installing an LM guide between a slide piece (fluid mold) and a counter die, slide against a counter die that rotates outward when bending the pipe It is about a press bending machine that can prevent scratches on the pipe surface, improve the appearance quality of the pipe, and extend the life of the mold by allowing the piece (flow mold) to slide relatively.

In addition, the present invention also relates to a pipe bending method using such a press bending machine.

In general, a muffler for a vehicle is a device for reducing noise caused by exhaust gas of a vehicle. A muffler manufacturing process involves bending a metal pipe.

As shown in Fig. 1, the press bending machine for pipes includes a ram block and a counter die. After placing the pipe on the upper surface of the counter die, if the pipe is pressed using a ram block, the pipe is bent while the counter die rotates outward.

However, there is a problem in that friction between the pipe and the counter die is large in the bending process. 2 shows a pipe manufactured by the bending process, it can be seen that scratches are generated on the outer surface of the pipe due to the friction.

The scratch deteriorates the appearance quality of the muffler and shortens the life of the product. In addition, there is a problem in that the life of the counter die is shortened due to the friction.

The present invention has been proposed to solve the above problems, by installing the LM guide 40 between the slide piece 50 (flowing mold) and the counter die 30, and rotating outward when bending the pipe 1 By allowing the slide piece 50 (flowing mold) to slide relative to the counter die 30, it is possible to prevent scratches on the surface of the pipe 1, improve the appearance quality of the pipe 1, and increase the life of the mold. An object of the present invention is to provide a press bending machine for pipe.

Another object of the present invention is that when the diameter of the pipe 1 is fixed (determined), the pipe can be freely bent in the range of 0° to 90° using one slide piece 50 (flowing mold), and accordingly An object of the present invention is to provide a press bending machine for a pipe of an automobile muffler, which is advantageous for small quantity production of various types.

Another object of the present invention is to provide a press bending machine for a pipe of an automobile muffler, which takes up a small space because the bending machine 100 is installed to stand vertically and the ram block 65 is vertically raised and lowered.

Another object of the present invention is to be able to program the bending angle by inputting it in several steps, to control the bending angle to the elevating length of the ram block 65, and to control a plurality of bending machines 100 with one controller. There is, to provide a press bending machine for a pipe of an automobile muffler, in which the work convenience and productivity of the operator are improved.

Another object of the present invention is to provide a pipe bending method using such a press bending machine.

In order to achieve the above object, a press bending machine 100 for a pipe according to a preferred embodiment of the present invention includes a ram block 65 that vertically elevates; It is installed on both sides under the ram block 65, and when the ram block 65 descends and presses the pipe 1, it rotates outward, and when the ram block 65 rises and the pressure is released, it rotates inward. The rotating unit 20 to return to the original state; The counter die 30 is installed on the rotating unit 20 and rotated together with the rotating unit 20; and a slide piece 50 that is slidably installed on the upper surface of the counter die 30 and rotates together with the counter die 30 .

The pipe (1) is placed on the upper surface of the slide piece (50), and when the rotating part (20) rotates outward, the slide piece (50) is rotated while sliding relative to the counter die (30). 1) can be bent.

A semi-circular groove 66 is formed on the outer surface of the ram block 65 in the circumferential direction, and a semi-circular groove 51 is formed on the upper surface of the slide piece 50 continuously along the longitudinal direction of the slide piece 50. have. The semicircular grooves 51 and 66 form a space in which the pipe 1 is disposed and press the pipe 1 .

On the upper surface of the counter die 30 , the LM guide 40 may be installed along the longitudinal direction of the counter die 30 . A slide piece 50 is installed on the upper surface of the LM guide 40 , and the sliding of the slide piece 50 may be achieved by sliding of the LM guide 40 .

The press bending machine 100 may include a frame 10 erected vertically. The frame 10 may include a guide groove 11 and a shaft hole. The guide groove 11 is formed to be vertically continuous to guide the elevating and lowering of the ram block 65, and the shaft hole is formed on both sides of the guide groove 11, respectively, by the rotation shaft 25 installed in the shaft hole. The rotating part 20 may be rotatably coupled to the frame 10 .

The rotating part 20, the first part 21 coupled to the front surface of the shaft hole; a second portion 22 coupled to the back side of the shaft hole; and a third portion 23 connecting the lower ends of the first and second portions 21 and 22 .

단면 형상을 이룰 수 있다.

단면 형상은 회동부(20)의 회동에 필요한 모멘트 크기를 크게 함으로써, 램 블록(65)의 가압시에 회동부(20)가 급격하게 회동되는 것을 방지할 수 있다. 바람직하게, 제3 부분(23)의 두께를 제1,2 부분(21)(22) 보다 두껍게 하여 큰 하중을 가지도록 함으로써 회동부(20)의 회동에 필요한 모멘트 크기를 크게 할 수도 있다. The counter die 30 is provided at the lower end of the first part 21 , and the first, second, and third parts 21 , 22 and 23 are

A cross-sectional shape can be achieved.

The cross-sectional shape increases the magnitude of the moment required for rotation of the rotation unit 20 , thereby preventing the rotation unit 20 from rapidly rotating when the ram block 65 is pressed. Preferably, the thickness of the third portion 23 is thicker than the first and second portions 21 and 22 so as to have a large load, so that the magnitude of the moment required for rotation of the rotational part 20 may be increased.

The ram block 65 may be installed in the elevating unit 60 . The elevating unit 60 may be vertically elevated while being guided by the guide groove 11 .

Preferably, the elevating unit 60 includes a first gear unit installed to pass through the frame 10 , and a second gear unit engaged with the first gear unit may be installed in the second part 22 . The rotating unit 20 may be rotated by the elevating unit 60 elevating and lowering in a state in which the first and second gear units are engaged.

The press bending machine 100 may further include a controller. The controller, the input unit for inputting the elevating length of the ram block (65) corresponding to the bending angle of the pipe (1); and a display unit for displaying the serial numbers of several bending machines, the serial numbers of the bending machines in operation, the elevating length, and the number of pipes for which the bending operation is completed.

Another aspect of the present invention, the pipe bending method, (a) the pipe (1) is placed on the upper surface of the slide piece (50) on both sides; (b) the ram block 65 is lowered to pressurize the pipe (1); And, (c) when the rotating parts 20 on both sides are rotated away from each other by the pressure, the slide piece 50 is rotated together with the rotating part 20 to bend the pipe 1, but the pipe (1) and supporting the pipe 1 while sliding relative to the counter die 30 due to frictional force with the .

In step (c), before and after the rotation, the contact point between the slide piece 50 and the pipe 1 does not change substantially, but the counter die 30 is rotated by the rotation of the rotation part 20. Sliding may occur.

In step (c), as the rotating parts 20 on both sides revolve away from each other, the inclination of the upper surface of the slide piece 50 increases, and accordingly, the bending angle of the pipe 1 increases.

The rotation of the rotation unit 20 may be interlocked with the elevation of the ram block 65 by the first and second gear units.

The pipe bending method includes, before step (a), (a1) installing a slide piece (50) having a semicircular groove (51) corresponding to the diameter of the pipe (1) on the LM guide (40); and, (a2) installing the ram block 65 having a semi-circular groove 66 corresponding to the diameter of the pipe 1 in the elevating unit 60; may include.

The pipe bending method, before step (b), (b1) determining a pipe bending angle; and, (b2) determining a descending length of the ram block 65 corresponding to the bending angle.

The present invention has the following effects.

First, it is possible to prevent scratches on the surface of the pipe (1), improve the appearance quality of the pipe (1), and increase the life of the mold.

Second, if only the diameter of the pipe 1 is determined, it is possible to bend the pipe in the range of 0° to 90° using one slide piece 50 (flowing mold), which is advantageous for small quantity production of various types.

Third, since the bending machine 100 is installed to stand vertically and the ram block 65 is vertically raised and lowered, the space occupied by it is small.

Fourth, the bending angle can be programmed by inputting it in several steps, the bending angle can be controlled by the elevating length of the ram block 65, a plurality of bending machines 100 can be controlled with one controller, and the operator's work Convenience and productivity are improved.

1 is a view showing that a pipe press bending machine for an automobile muffler bends a pipe according to the prior art;
Figure 2 is a photograph showing a pipe manufactured by the bending of Figure 1;
3 is a perspective view showing a press bending machine according to a preferred embodiment of the present invention.
Figure 4a is a front view showing that the pipe is installed in the press bending machine.
4B is an enlarged view of part A of FIG. 4A;
Fig. 5a is a front view showing that the pipe is bent by a press bender;
5B is an enlarged view of part B of FIG. 5A;
6 is a view showing the relationship between the ram block and the slide piece.
7 is a perspective view showing a rotating part.
Figure 8 (a) is a front view showing the LM guide, Figure 8 (b) is a left view showing the LM guide, Figure 8 (c) is a plan view showing the LM guide.
Figure 9 (a) is a plan view showing a connecting jig for connecting the slide piece and the LM guide, Figure 9 (b) is a left side view showing the connecting jig.
Fig. 10 is a view showing a screen of a controller;

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept consistent with the technical idea of the present invention. Accordingly, the embodiments described in the present specification and the configurations shown in the drawings are merely embodiments of the present invention and do not represent all of the technical spirit of the present invention, so various equivalents that can be substituted for them at the time of the present application It should be understood that there may be variations and variations.

Meanwhile, in this specification and claims, a pipe means a metal pipe. And, in the drawing, the x, y, and z axes are added to help understanding, and are perpendicular to each other as three axes of the Cartesian coordinate system.

3 is a perspective view showing a press bending machine according to a preferred embodiment of the present invention, FIG. 4A is a front view showing that a pipe is installed in the press bending machine, and FIG. 4B is an enlarged view of part A of FIG. 4A .

As shown in the figure, the press bending machine 100 is installed in the frame 10, the elevating unit 60 installed so as to be able to elevate the frame 10, and the elevating unit 60 installed in the elevating unit 60. The ram block 65 to be raised and lowered, the rotating part 20 installed so as to be rotatable on both sides of the frame 10, and the counter die 30 installed in the rotating part 20 and rotating together with the rotating part 20 and an LM guide (40, Linear Motion guide) installed on the counter die 30 , and a slide piece 50 installed on the LM guide 40 .

The frame 10 may include a guide groove 11 and a shaft hole.

와 같은 단면 형상을 갖는다. 그리고, 프레임(10)의 양측에는 축지부(13)가 돌출되도록 형성된다. 축지부(13)에는 샤프트홀이 형성되고, 회동축(25)이 샤프트홀을 관통하도록 설치된다. The frame 10 is installed vertically on the upper surface of the workbench 90 and is formed to be longer in the height direction (z direction) than in the horizontal (x-direction) and vertical (y-direction) directions. Preferably, in the frame 10, the guide groove 11 is long and continuously formed along the longitudinal direction (z direction), and thus the frame 10 is

has the same cross-sectional shape. In addition, both sides of the frame 10 are formed to protrude shaft portions 13 . A shaft hole is formed in the shaft portion 13 , and the rotation shaft 25 is installed to pass through the shaft hole.

The elevating part 60 is installed in the guide groove 11 . The lifting unit 60 is raised and lowered by hydraulic pressure while being guided by the guide groove 11 . A ram block 65 is installed in the elevating unit 60 to elevate and lower together with the elevating unit 60 .

Meanwhile, although not shown in the drawings, the elevating unit 60 may include a first gear unit protruding backward through the frame 10 . The first gear unit is installed to mesh with the second gear unit (not shown in the drawing) of the rotation unit 20 . For example, the first gear unit may be a rack gear and the second gear unit may be a pinion gear. When the first gear unit elevates and descends according to the elevating unit 60 , the pinion gear is rotated to rotate the rotating unit 20 .

As shown in FIG. 6 , the ram block 65 has a circular disk structure with a flat top surface 67 , and a semicircular groove 66 is formed on the side surface thereof. The semi-circular groove 66 may cooperate with the semi-circular groove 51 of the slide piece 50 to form a circular cross-section. The curvature and radius of the semicircular grooves 51 and 66 may be determined according to the outer diameter of the pipe 1 .

Meanwhile, in the present specification and claims, a semicircular groove includes not only a semicircular groove in a mathematical sense but also a groove having a shape close to a semicircle.

The rotating part 20 is rotatably installed on both sides of the frame 10 . Specifically, as shown in FIGS. 1 and 7 , the rotating part 20 includes a first part 21 coupled to the front side of the shaft hole, a second part 22 coupled to the back side of the shaft hole, and the first, It may include a third part 23 connecting the lower ends of the two parts 21 and 22 , and a rotation shaft 25 installed in the shaft hole to pass through the first and second parts 21 and 22 . .

단면 형상을 이룬다.

단면 형상은 회동부(20)의 회동에 필요한 모멘트 크기를 크게 함으로써, 램 블록(65)의 가압시에 회동부(20)가 급격하게 회동되는 것을 방지할 수 있다. 바람직하게, 제3 부분(23)의 두께를 제1,2 부분(21)(22) 보다 두껍게 하여 큰 하중을 가지도록 함으로써 회동부(20)의 회동에 필요한 모멘트 크기를 크게 할 수도 있다.
램블록(65)의 가압이 시작되기 전에 회동축(25)과 제1,2,3 부분(21)(22)(23)은 램블록(65)의 이동경로(C)와 측방향으로 소정 간격으로 이격되고 제1 부분(21)의 하단에는 카운터 다이(30)가 구비되되 카운터 다이(30)는 이동경로(C)까지 연장된다. 따라서, 램블록(65)의 가압이 작용하면 카운터 다이(30)가 상기 가압을 지지하면서 회동축(25)을 중심으로 회동된다. In addition, a counter die 30 is provided at the lower end of the first part 21 , and the first, second, and third parts 21 , 22 , and 23 are formed as a whole.

form a cross-sectional shape.

The cross-sectional shape increases the magnitude of the moment required for rotation of the rotation unit 20 , thereby preventing the rotation unit 20 from rapidly rotating when the ram block 65 is pressed. Preferably, the thickness of the third portion 23 is thicker than the first and second portions 21 and 22 so as to have a large load, so that the magnitude of the moment required for rotation of the rotational part 20 may be increased.
Before the pressing of the ram block 65 starts, the rotation shaft 25 and the first, second, and third parts 21 , 22 and 23 are predetermined in the lateral direction with the movement path C of the ram block 65 . A counter die 30 is provided at the lower end of the first part 21 and spaced apart from each other, and the counter die 30 extends to the movement path (C). Accordingly, when the pressing of the ram block 65 is applied, the counter die 30 is rotated about the rotation shaft 25 while supporting the pressing.

As shown in FIGS. 4a to 4b and 5a to 5b, when the slide piece 50 is pressed by the ram block 65 in a state where the counter die 30 of the both sides of the rotating part 20 are in contact with each other, both sides of the rotating part (20) is rotated outward. That is, both sides of the rotating portion 20 is rotated away from each other. At this time, even if the pressing force of the ram block 65 acts, since the rotating part 20 has its own weight, it can be prevented from rotating the rotating part 20 abruptly outward.

Then, when the ram block 65 rises and the pressure is relieved, the both sides of the rotating parts 20 are rotated in opposite directions to return to their original state.

A second gear unit (not shown) may be installed at the upper end of the second part 22 , and the second gear unit has been described above.

The counter die 30 is coupled to the lower end of the first part 21 . Accordingly, when the rotation unit 20 is rotated, the counter die 30 is also rotated. A rail groove 31 is formed on the upper surface of the counter die 30 . The rail groove 31 is a groove for installing the rail 41 of the LM guide 40 and is formed to extend along the longitudinal direction (x direction) of the counter die 30 .

The counter dies 30 are respectively installed in the first portions 21 on both sides, and when there is no pressurization by the ram block 65 , the front ends of the counter dies 30 on both sides are arranged to abut against each other.

The LM guide (40, Linear Motion guide) is installed in the rail groove (31). As shown in Figures 8 (a) to 8 (c), the LM guide 40 is provided with a rail 41 and a flat plate (45). The flat plate 45 may slide along the rail 41 . The flat plate 45 includes a first bolt hole 46 .

Preferably, the connection jig 55 may be coupled to the upper surface of the flat plate portion 45 . Accordingly, the connecting jig 55 and the flat plate 45 slide together. As shown in FIGS. 9(a) to 9(b) , the connection jig 55 may include a second bolt hole 56 and a first fastening hole 57 . The second bolt hole 56 and the first fastening hole 57 are formed to pass through the connection jig 55 .

By fastening the bolts (not shown in the drawing) to the first and second bolt holes 46 and 56, the connecting jig 55 and the flat plate part 45 are fastened, and a predetermined fastener (not shown in the drawing) is fastened. The connecting jig 55 and the slide piece 50 are fastened by being fastened to the first and second fastening holes 57 (52 in FIG. 6 ).

The slide piece 50 is installed to be coupled to the connection jig 55 . Accordingly, the slide piece 50 slides together with the connecting jig 55 and the flat plate portion 45 . As shown in FIG. 6 , a semi-circular groove 51 is formed on the upper surface of the slide piece 50 and a second fastening hole 52 is formed on the lower surface of the slide piece 50 .

The semi-circular grooves 51 of the slide pieces 50 on both sides are installed to be connected to each other. Then, the pipe 1 is installed in the semi-circular groove 51 .

[Bending method using press bending machine for pipe]

Then, a pipe bending method using the above-described press bending machine 100 will be described below. For convenience of description, as shown in FIG. 10 , a case in which seven bending machines are controlled by one controller will be described.

First, the serial number of the bending machine 100 is input through the controller, and the elevating length of the bending machine 100 is inputted. 10 shows a screen of the controller (an example of a display unit and an input unit), '(1) BENDING NO' indicates the number of the currently working bending machine among 7 bending machines, and '(2) BENDING POS (mm)' is Indicates the length (moving length) of the ram block of the bending machine currently being worked, '(3) COUNTER' indicates the completed quantity (number of pipes), and '(4) BENDING POS SET' indicates each of the 7 bending machines. As indicating the descending length (travel length), NO. Only the activated ones from 1 to 7 work, '(5) MANUAL S/W' is a button to manually raise/lower the ram block, and '(6) COUNTER RST' is a button to reset the work quantity, '(7) I/O CHECK' is a button to enter the administrator mode, and '(8) ALARM' is a button to show alarm log records.

Next, the ram block 65 and the slide piece 50 corresponding to the outer diameter of the pipe 1 are installed, respectively. Specifically, a ram block 65 having a semi-circular groove 66 corresponding to the outer diameter of the pipe 1 is installed in the elevating unit 60, and a semi-circular groove 51 corresponding to the outer diameter of the pipe 1 is provided. The slide piece 50 is installed on the connecting jig 55 .

Next, the pipe 1 is placed in the semicircular grooves 51 of the slide pieces 50 on both sides. Since the semi-circular grooves 51 of both slide pieces 50 are connected to each other in the absence of the pressing force of the ram block 65 , the pipe 1 is disposed in the connected semi-circular grooves 51 . And, the outer surface of the pipe (1) is in contact with the semi-circular groove (51) of the slide piece (50).

Then, when the lifting unit 60 is lowered by operating a hydraulic device (not shown in the drawing), the ram block 65 is also lowered to pressurize the pipe 1 . By this pressurization, the rotation part 20 of both sides rotates in the direction away from each other.

At this time, since frictional force acts between the pipe 1 and the slide piece 50, there is little or no sliding between the slide piece 50 and the pipe 1, and due to the rotation of the rotating part 20, the LM guide 40 Sliding occurs mainly by the , and accordingly, the slide piece 50 only rotates in place. That is, the contact point between the slide piece 50 and the pipe 1 before and after the rotation of the rotation unit 20 is substantially unchanged, but the counter die 30 is rotated by the rotation of the rotation unit 20, so that the LM Sliding of the guide 40 occurs. As such, since there is little or no sliding (movement) of the slide piece 50 , the surface damage of the pipe 1 does not occur.

On the other hand, a pipe made by a conventional press bending machine has a problem in that a scratch (refer to FIG. 2) occurs on the surface, thereby damaging the aesthetics and shortening the life of the mold.

On the other hand, when the descending of the ram block 65 is completed by the previously input descending length, the ram block 65 rises upward. When the ram block 65 rises, the pressing force is released, so the rotating part 20 is rotated in the opposite direction to return to its original state.

In the press bending machine 100 according to the present invention, as the descending length (moving length) of the ram block 65 increases, the bending angle of the pipe 1 increases. Therefore, when the diameter of the pipe (1) is determined, the slide piece (50) and the ram block (65) suitable for the diameter of the pipe are installed, and the descending length corresponding to the bending angle is input to the controller to adjust the pipe (1) to the desired angle. can be bent. By adjusting only the descent length, the pipe can be bent at an angle of 0° to 90°.

Meanwhile, in the above description, bending the pipe for an automobile muffler has been described as an example, but the scope of the present invention is not limited to bending the pipe for an automobile muffler. It should also be understood that

1: Pipe 10: Frame
11: guide groove 13: shaft part
20: rotating part 21: first part
22: second part 23: third part
25: axis of rotation 30: counter die
31: rail groove 40: LM guide
41: rail 45: flat plate
46: first bolt hole 50: slide piece
51: semicircular groove 52: second fastening hole
55: connection jig 56: second bolt hole
57: first fastening hole 60: elevating part
65: ram block 66: semicircular groove
67: top of ram block 90: workbench
100: press bending machine

Claims (13)

Ram block 65 installed on the frame 10 to vertically elevate;
It is installed on both sides under the ram block 65, and when the ram block 65 descends and presses the pipe 1, it rotates outward, and when the ram block 65 rises and the pressure is released, it rotates inward. The rotating unit 20 to return to the original state;
The counter die 30 is installed on the rotating unit 20 and rotated together with the rotating unit 20; and,
A slide piece (50) that is slidably installed on the upper surface of the counter die (30) and rotates together with the counter die (30);
The pipe (1) is placed on the upper surface of the slide piece (50) so that the outer side of the pipe (1) is in contact with the slide piece (50),
When the rotating part 20 rotates outward, there is no sliding between the pipe 1 and the slide piece 50, and the pipe 1 is rotated by the slide piece 50 due to the rotation of the rotating part 20. Bending, the counter die 30 is rotated while sliding relative to the slide piece 50,
Shaft holes are formed on both sides of the frame 10, respectively, and the rotating part 20 is rotatably coupled to the frame 10 by a rotating shaft 25 installed in the shaft hole,
The rotating unit 20,
a first portion 21 coupled to the front surface of the shaft hole;
a second portion 22 coupled to the back side of the shaft hole; and,
Including; and a third part 23 connecting the lower ends of the first and second parts 21 and 22.
A counter die 30 is provided at the lower end of the first portion 21, and the first, second, and third portions 21, 22, and 23 are

form a cross-sectional shape,
Before the pressing of the ram block 65 starts, the rotation shaft 25 and the first, second, third parts 21, 22, and 23 are predetermined in the lateral direction with the movement path C of the ram block 65 . Spaced apart at intervals and the counter die 30 extends to the movement path (C),
A press bending machine for a pipe, characterized in that when the pressure of the ram block 65 is applied, the pipe 1 is bent by rotating the counter die 30 about the rotation shaft 25 while supporting the pressure. According to claim 1,
A semicircular groove 66 is formed on the outer surface of the ram block 65 in the circumferential direction,
On the upper surface of the slide piece 50, semi-circular grooves 51 are continuously formed along the longitudinal direction of the slide piece 50, and the semi-circular grooves 51 and 66 form a space in which the pipe 1 is disposed, and the pipe (1) A press-bending machine for pipes, characterized in that it is pressurized. 3. The method of claim 2,
On the upper surface of the counter die 30 , the LM guide 40 is installed along the longitudinal direction of the counter die 30 , and the slide piece 50 is installed on the upper surface of the LM guide 30 , and the slide piece 50 and A press bending machine for pipes, characterized in that the sliding between the counter dies (30) is made by the sliding of the LM guide (40). 4. The method according to any one of claims 1 to 3,
The frame 10 is provided with a guide groove 11,
The guide groove (11) is formed to be continuous vertically, characterized in that to guide the elevation of the ram block (65), a press bending machine for a pipe. delete delete delete (a) placing the pipe (1) on the upper surface of both slide pieces (50) so that the outer side of the pipe (1) is in contact with the slide piece (50);
(b) the ram block 65 is lowered to pressurize the pipe (1); and,
(c) there is no sliding between the pipe 1 and the slide piece 50 when the rotating parts 20 on both sides are rotated about the rotating shaft 25 so as to move away from each other by the pressurization of the rotating unit 20 The pipe 1 is bent by the rotation of the slide piece 50 due to the rotation, and the counter die 30 is rotated while sliding relative to the slide piece 50;
The rotating shaft 25 is installed in the shaft hole,
The rotating unit 20,
a first portion 21 coupled to the front surface of the shaft hole;
a second portion 22 coupled to the back side of the shaft hole; and,
Including; and a third part 23 connecting the lower ends of the first and second parts 21 and 22.
A counter die 30 is provided at the lower end of the first part 21 , and the first, second, and third parts 21 , 22 and 23 are

form a cross-sectional shape,
Before the pressing of the ram block 65 starts, the rotation shaft 25 and the first, second, third parts 21, 22, and 23 are predetermined in the lateral direction with the movement path C of the ram block 65 . Spaced apart at intervals and the counter die 30 extends to the movement path (C),
When the pressure of the ram block 65 is applied, the pipe 1 is bent by rotating the counter die 30 about the rotation shaft 25 while supporting the pressure, the pipe bending method. delete 9. The method of claim 8,
In the step (c), as the rotating parts 20 on both sides rotate in a direction away from each other, the bending angle of the pipe 1 increases as the inclination of the upper surface of the slide piece 50 increases. Way. delete 11. The method of claim 8 or 10,
The LM guide 40 is installed between the slide piece 50 and the counter die 30,
Before step (a),
(a1) installing a slide piece 50 having a semicircular groove 51 corresponding to the diameter of the pipe 1 on the LM guide 40; and,
(a2) installing the ram block 65 having a semi-circular groove 66 corresponding to the diameter of the pipe (1) in the elevating unit 60; Pipe bending method comprising a. 13. The method of claim 12,
Prior to step (b),
(b1) determining a pipe bending angle; and,
(b2) determining the descending length of the ram block (65) corresponding to the bending angle; characterized in that it comprises a, pipe bending method.

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