KR102666001B1 - Bending knife removing device for jco steel pipe bending machine - Google Patents

Abstract

In the present invention, after bending a flat steel plate into a steel pipe with an "○" shape, the support pressurizes and presses the steel pipe in the process of lifting the banding knife to remove the banding knife inserted inside the steel pipe. The banding knife can be removed from the steel pipe without getting caught, and the support is composed of a fixed support and a floating support so that the length of the support can be adjusted, so the banding knife can be removed from steel pipes formed into various diameters regardless of the diameter size of the steel pipe. It provides a banding knife removal device for a JCO steel pipe bending machine that can precisely form a steel pipe by preventing deflection of the steel pipe being banded by varying the height of each section of the lower die.

Description

BENDING KNIFE REMOVING DEVICE FOR JCO STEEL PIPE BENDING MACHINE}

The present invention relates to a steel pipe removal device for a JCO steel pipe bending machine. More specifically, after bending a flat-type steel plate into an "○" shaped steel pipe, the steel pipe is pressed with a support so that only the banding knife comes out. This relates to a banding knife removal station for the JCO steel pipe bending machine that allows the banding knife to be removed from the outside of the steel pipe without jamming.

In general, steel pipes are formed by various methods, one of which is the forming method.

As a prior art related to the forming processing method, an 'automatic pipe forming machine' is presented in Korea Registered Utility Model Publication No. 20-0326241. The automatic pipe molding machine includes a material supply unit that supplies material, a material transfer unit that transfers the material supplied through the material supply unit in the longitudinal direction so that it can be input into the molding machine, and the material transferred from the material transfer unit is moved to the left and right. A material setting unit that sets the material to be transported to the correct position without twisting, a material forming unit that sequentially bends the material set in the material setting unit to form a pipe shape of a desired shape, and a material formed in the material forming unit. A joint compression section equipped with a roller that compresses the outer peripheral surface to maintain the shape of the material and allow the joints formed in the longitudinal direction to contact each other, a welding section to join the joints of the material with an automatic welder, and the finished pipe to the outside of the molding machine. It consists of a discharge section that transfers.

Meanwhile, recently, a JCO steel pipe banding forming method has been proposed.

The JCO steel pipe bending forming method forms a pipe by continuously applying local impacts in the width direction of the steel plate.

In other words, when an impact is applied locally to one side of the steel sheet in the width direction, the steel sheet is formed into the shape of the letter "J", and then with continued impact, the sheet is gradually formed into the shape of the letter "C", and finally into the shape of the letter "O". It is formed into a steel pipe in the shape of a pipe.

This JCO steel pipe bending forming method not only has no limitations on the thickness of the steel plate, but the initial investment cost is also relatively low, enabling small quantity production of a variety of products.

Meanwhile, in the process of bending a steel plate into a steel pipe, once it is formed into the final shape of the steel pipe, the banding knife used in forming the steel pipe must be pulled out from the inside of the steel pipe and separated from the steel pipe. At this time, both ends of the steel pipe rolled into a circle are used. As the banding knife is pressed and pressed against both sides, there is a problem in that the banding knife gets caught on both ends of the steel pipe, making it very difficult to remove the banding knife. In particular, as the thickness of the steel plate increases, the adhesive force applied to both sides of the banding knife becomes stronger, making it more difficult to separate the banding knife.

On the other hand, when bending a steel plate into a steel pipe, if the same pressure is applied to both sides and the center of the steel plate, a deflection phenomenon occurs in the center of the steel pipe after it is formed into a pipe. , This requires that the central part of the steel plate have relatively greater stress than both sides, but since the conventional steel pipe bending device does not have a device that can transmit large stress to the central part of the steel plate, deflection of the steel pipe is caused through a post-process. There is the inconvenience of having to perform additional proofreading work.

Republic of Korea Intellectual Property Office Open Patent Publication No. 10-2015-0075563 Republic of Korea Registered Utility Model Publication No. 20-0326241

Therefore, the purpose of the present invention to solve the problems described above is to bend and form a flat-type steel plate into an "○" shaped steel pipe, and then pressurize the steel pipe with a support so that only the bending knife comes out to form the steel pipe. The aim is to provide a banding knife removal device for the JCO steel pipe bending machine that allows the banding knife to be removed from the outside without jamming.

Another object of the present invention is to provide a banding knife removal device for a JCO steel pipe bending machine that can remove the banding knife from a steel pipe formed into various diameters regardless of the diameter size of the steel pipe.

Another object of the present invention is to provide a banding knife removal device for a JCO steel pipe bending machine that can correct the deflection phenomenon of the steel pipe being banded by varying the height of the lower die for each section.

The present invention for achieving the above-described objects is a banding knife removal device of a JCO steel pipe bending machine for removing a banding knife that is formed into an "○" shaped steel pipe by pressing and impacting a flat steel plate, from the steel pipe. , a lower die installed on the upper part of the base and on which the steel plate is placed, an upper fixture fixed to the upper part of the lower die at a certain distance, at least one hydraulic cylinder installed on the upper fixture, and below the upper fixture. An elevating platform is located and moves up and down by driving the hydraulic cylinder. It is fixed and installed on the lower surface of the elevating platform and moves up and down by the operation of the elevating platform and pressurizes the steel plate placed on the lower die to impact the flat plate. It includes a banding knife for bending a shaped steel plate into an "○" shaped steel pipe, and at least one support is installed on both sides of the banding knife, the tip of the support is fixed to the upper fixture, and the lower end of the support is fixed to the upper fixture. In the process of lifting the banding knife, the banding knife comes into press contact with the outer diameter of the steel pipe lifted together with the banding knife, and the banding knife is removed from the steel pipe.

The support is a fixed support fixed to the lower surface of the upper fixture, a spiral groove recessed at the bottom of the fixed support, screwed to the spiral groove, and fastened to be movable up and down below the fixed support. It is desirable to configure it with a floating support.

At least one calibration unit is installed on the lower surface of the lower die, and the calibration unit includes a motor, a worm wheel that rotates with the power of the motor, and a worm wheel that engages with the worm wheel and moves back and forth in a straight line by the rotation of the worm wheel. A lead screw is coupled to the tip of the lead screw and is composed of a wedge-shaped plate whose upper surface is formed with an inclined surface for surface contact with an inclined surface formed on the lower surface of the lower die, and the wedge-shaped plate is formed by the movement of the lead screw. The plate is preferably configured to adjust the height of the lower die in the process of moving back and forth.

In the present invention, after bending a flat steel plate into a steel pipe with an "○" shape, the support pressurizes and presses the steel pipe in the process of lifting the banding knife to remove the banding knife inserted inside the steel pipe. The banding knife can be removed from the steel pipe without getting caught.

In addition, by composing the support into a fixed support and a floating support so that the length of the support can be adjusted, the effect of being able to remove the banding knife from a steel pipe formed into various diameters is achieved regardless of the diameter size of the steel pipe.

In addition, by varying the height of each section of the lower die, the deflection phenomenon of the steel pipe being banded is prevented, allowing the steel pipe to be formed precisely.

Figure 1 is a diagram showing the overall configuration of the JCO steel pipe bending machine of the present invention.
Figure 2 is a side view of Figure 1.
Figure 3 is a diagram illustrating the main components of the band knife removal device installed in the JCO steel pipe bending machine shown in Figure 1.
Figure 4 is a side view of Figure 3.
Figures 5 and 6 are diagrams sequentially showing the process in which the band knife is removed from the steel pipe in the JCO steel pipe bending machine according to the present invention.
Figure 7 is a view showing a state in which the length of the support is adjusted to match the diameter size of the steel pipe in Figure 4.
Figure 9 is a plan view showing an excerpt of the calibration unit of Figure 1.
Figure 10 is a side view of Figure 9.
Figure 11 is a diagram showing the operating state of the calibration unit shown in Figure 10.
Figure 12 is a diagram showing the process of correction using a correction unit when deflection of a pipe occurs.

Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. In the detailed description below, representative embodiments of the present invention will be presented to achieve the above-described technical problem. And other embodiments that can be presented with the present invention are replaced with descriptions in the configuration of the present invention.

In the JCO steel pipe bending machine of the present invention, when an impact is applied to a flat steel sheet (1), the steel sheet is formed into the shape of the letter "J", and then with continued impact, the steel sheet is gradually formed into the shape of the letter "C", and then finally. This is a device for bending and forming steel pipes in the shape of the alphabet “O”.

Figure 1 is a diagram showing the overall configuration of the JCO steel pipe bending machine of the present invention, Figure 2 is a side view of Figure 1, and Figure 3 shows the main configuration of the band knife removal device installed in the JCO steel pipe bending machine shown in Figure 1. It is a drawing showing an excerpt, Figure 4 is a side view of Figure 3, Figures 5 and 6 are diagrams sequentially showing the process in which the band knife is removed from the steel pipe in the JCO steel pipe bending machine according to the present invention, and Figure 7 is Figure 4 shows a state in which the length of the support is adjusted according to the diameter size of the steel pipe.

1 to 7, the JCO steel pipe bending machine of the present invention includes a base 200, a lower die 210 installed on the upper surface of the base 200, and a support 220 on the upper part of the lower die 210. The external appearance is composed of an upper fixture 230 installed at a certain distance between the two.

A flat steel plate (1) is placed on the lower die (210), and a forming unit ( 100) is installed.

The forming unit 100 largely includes a hydraulic cylinder 30, an elevating platform 10, and a banding knife 20.

The hydraulic cylinder 30 is a driving means that operates hydraulically, and at least one of the hydraulic cylinders 30 is arranged at a certain distance from the upper fixture 230.

The lifting platform 10 is located below the upper fixture 230 and is coupled to the rod 32 of the hydraulic cylinder 30, and performs lifting and lowering operations by driving the hydraulic cylinder 30.

The lifting platform 10 is manufactured to have a predetermined length, and is preferably manufactured to have a length corresponding to the length of the steel pipe 2 to be formed.

Guides 14 are provided on both sides of the elevating platform 10, and the guides 14 are installed on the inner surface of the support 220 that supports the upper fixture 230 at a certain distance from the base 200. In the state where it is inserted into the guide rail 16, it moves on the guide rail 16 according to the lifting and lowering motion of the lifting platform 20 and guides the operation of the lifting platform 10.

The banding knife 20 is fixedly installed on the lower surface of the elevating platform 10, moves up and down by the operation of the elevating platform 10, and applies impact by pressing the steel plate 1 placed on the lower die 210. It is a means. In the process of continuously generating impacts from the bending knife 20 to the steel sheet 1, the flat steel sheet 1 is formed into an “○” shaped steel pipe 2.

The bending knife 20 is manufactured to have a length corresponding to the length of the steel plate 1 placed on the lower die 210, and can transmit impact by simultaneously pressing the entire section of the steel plate 1 in one pressing operation. make it possible

Supports 40 are installed on both sides of the banding knife 20. The support 40 is a unit provided for the purpose of easily removing the banding knife 20 from the steel pipe 2. In other words, after impacting the steel plate (1) with the banding knife (20) to form the flat steel plate (1) into an “○” shaped steel pipe (2), both ends of the steel pipe (2) are rolled into a round shape in the final shape. This results in pressurized contact with both outer surfaces of the banding knife (20). In this way, when both ends 2a of the steel pipe 2 formed in the "○" shape press both outer surfaces of the banding knife 20, in the process of returning (elevating) the banding knife 20 to its initial state, the steel pipe 2 ) occurs, making it very difficult to independently remove only the banding knife (20). Therefore, in the present invention, when the banding knife 20 is raised to its initial state, the support 40 presses the top of the steel pipe 2 to induce the banding knife to come out of the steel pipe 2, thereby creating a banding knife ( 20) Without the need for a separate post-process for removal, the operation of returning (elevating) the banding knife (20) to its initial state and simultaneously removing the banding knife (20) from the steel pipe (2) can be implemented. .

The support 40 for this must remain fixed even during the raising and lowering movement of the banding knife 20 shown in FIG. 4. Therefore, the tip of the support 40 is fixed to the upper fixture 230, and its lower end is configured to be exposed below the elevating platform 10 while penetrating the hole 12 formed in the elevating platform 10.

The support 40 can be divided into a fixed support 42 and a floating support 50.

The fixing support 42 is a support fixed to the upper fixing stand 230 by welding or the like, and a spiral groove 44 is recessed at the bottom of the fixing support 42.

The flow support 50 is screwed to the bottom of the fixed support 42, and a screw thread 52 is formed on the upper outer diameter of the flow support 50, and the screw thread 52 is formed. The upper end of the floating support (50) is inserted into the spiral groove (44) of the fixed support (42) and fastened with a screw, so that the floating support (50) can be separated from below the fixed support (42). Configure the connection.

The lower end of the floating support 50, which is screwed to the fixed support 42, is subjected to a process of elevating the banding knife 20 to remove the banding knife 20 from the steel pipe 2 formed in an “○” shape. It comes into contact with the outer diameter of the steel pipe (2) lifted together with the banding knife (20). That is, as shown in FIGS. 5 and 6, if the banding knife 20 is continuously raised and lowered while the flow support 50 is in contact with the outer diameter of the steel pipe 2, as a result, the end of the steel pipe 2 is bent. Even if both outer surfaces of the steel pipe (20) are pressed, the steel pipe (2) is not lifted together with the banding knife (20) and is caught on the flow support (50), so that the banding knife (20) can be removed from the steel pipe (2).

The reason that the support 40 is divided into two fixed supports 42 and a floating support 50 is to allow the height of the support 40 to be adjusted according to the diameter of the steel pipe 2 to be formed. For example, if the diameter of the steel pipe (2) being formed is different, the support (40) may contact the outer diameter of the steel pipe (2) while forming the steel pipe (2) with a different diameter, causing interference in the forming of the steel pipe (2). This is because, on the contrary, if the diameter of the steel pipe (2) is small, the small-diameter steel pipe (2) is lifted too high and gets caught on the flow support (50), resulting in a collision due to the steel pipe (2) falling, causing the steel pipe (2) to fall. 2) It may cause damage to the surface.

Therefore, as shown in FIG. 7, when the flow shaft 50 is rotated in the forward or reverse direction according to the diameter size of the steel pipe 2 to be formed, the flow shaft 50 moves through the spiral groove 44 of the fixed shaft 42. By moving up and down while riding, the length of the support (40) can be adjusted according to the diameter of the steel pipe (2).

Meanwhile, a calibration unit 60 is installed below the lower die 210. The correction unit 60 is a unit provided for the purpose of correcting deflection (a fullness phenomenon) that may occur in the center of the steel plate 1 during the process of press forming the steel plate 1. That is, when pressing and forming the steel sheet 1 placed on the lower die 210 with the band knife 20, the central part of the steel sheet 1 must have relatively greater stress than both sides to form the steel sheet 1. ) can prevent deflection from occurring in the center of the area. However, since the conventional steel pipe bending machine does not have a device that can transmit large stress to the central part of the steel plate 1, there is the inconvenience of having to additionally perform the task of correcting the deflection of the steel pipe 2 through a post-process. Therefore, by using the calibration unit 60, the height of the central part of the lower die 210, where the steel sheet 1 is placed, is raised relatively compared to both sides, thereby transmitting a large stress to the central part of the steel sheet 1. Helps prevent deflection.

The calibration units 60 have the same structure and are arranged at a certain distance along the longitudinal direction of the lower die. In the following, the structure of one calibration unit is representatively described.

Figure 9 is a plan view showing an excerpt of the calibration unit of Figure 1, Figure 10 is a side view of Figure 9, Figure 11 is an operation state diagram of the calibration unit shown in Figure 10, and Figure 12 is a deflection of the pipe. This diagram shows the process of correction using a correction unit when an error occurs.

As shown in FIGS. 9 to 12, the calibration unit 60 includes a motor 62, a worm wheel 64 coupled to the axis of the motor 62, and a worm wheel 64 engaged with the worm wheel 64. It includes a lead screw 66 that reciprocates in the forward and backward directions by rotation, and a wedge-shaped plate 68 coupled to the tip of the lead screw 66.

The lower die 210 is placed on the upper surface of the wedge-shaped plate 68. At this time, the bottom surface of the lower die 210 and the wedge-shaped plate 68 butt against the bottom surface of the lower die 210. ) are formed on the upper surface of the inclined surface portions 68a and 210a, respectively, so that the lower die 210 is lifted upward or downward according to the forward and backward movement of the wedge-shaped plate 68, and the lower die 210 is raised. Allows you to adjust the height.

The calibration units 60 equipped with the above-described wedge-shaped plate 68 have the same configuration and are arranged in plural numbers along the longitudinal direction of the lower die 210, but the operation of each calibration unit 60 is individually controlled. Make it possible. Through this, the height of the lower die 210 can be individually set differently for each section where the calibration unit 60 is placed.

Hereinafter, the operation of the steel pipe stripping device of the JCO steel pipe bending machine of the present invention will be described with reference to FIGS. 1 to 12.

First, a flat-type steel plate (1) is placed on the lower die (210) of the JCO steel pipe bending machine, and then the hydraulic cylinder (30) installed on the upper fixture (230) is driven, and the load of the hydraulic cylinder (30) is The elevating platform 10 coupled to (32) moves up and down, and at the same time, the banding knife 20 installed on the lower surface of the elevating platform 10 moves the lower die 210 by the operation of the elevating platform 10. The steel plate (1) placed on is pressurized and impacts are continuously applied to form the steel pipe (2) in the shape of the letter "O" from the letter "J" through the shape of the letter "C".

After the flat steel plate 1 is formed into an alphabet "O" shaped steel pipe 2 by the pressurizing operation of the banding knife 20, the banding knife 20 is raised and lowered to return to the initial state, and then the formed steel pipe is returned to its initial state. (2) is taken out from the lower die 210, and at this time, the stopper 40 located on both sides of the banding knife 20 presses the steel pipe 2 lifted with the banding knife 20, so that the banding knife 20 (20) can be easily removed from the steel pipe (2).

That is, the support 40 is fixed to the upper fixture 230 and is screwed to the bottom of the fixed support 42 and the fixed support 42 penetrating the hole 12 of the elevating platform 10. When the banding knife (20) begins to be lifted by the driving of the lifting platform (10) in the state configured with the flow support (50), both ends (2a) of the steel pipe (2) are in pressurized contact with the outer surfaces of both sides of the banding knife (20). The steel pipe (2) along with the banding knife (20) also begins to be lifted.

Next, the support 40, located on both sides of the banding knife 20 and fixed to the upper fixture 230, is in contact with the outer diameter of the steel pipe 2 lifted together with the banding knife 20. As the banding knife (20) continues to move up and down in this state, the pressure of the support (40) is transmitted to the steel pipe (2), so that the steel pipe (2) is separated from the banding knife (20) and then attached to the lower die (210). At the same time as it is placed again, the banding knife (20) is removed from the steel pipe (2) and returns to its initial state.

On the other hand, the support 40 consists of a fixed support 42 and a floating support 50 screwed to the bottom of the fixed support 42, and when forming a steel pipe 2 with a large diameter, the steel pipe ( By rotating the flow support (50) according to the diameter of 2) and moving it upward along the spiral groove (44) of the fixed support (42), the banding knife can be removed from the steel pipe without interference even when forming a steel pipe (2) with a large diameter. there is.

In addition, in order to prevent deflection in the process of pressing the steel plate (1) and forming it into the steel pipe (2), the lower die 210, which supports the steel plate (1), is used to transmit a large stress to the center of the steel plate (1). It is necessary to increase the height of the central part relatively compared to both sides of the lower die 210. At this time, when power is applied to the motor 62, which is the calibration unit 60 located below the center of the lower die 210, the worm wheel 64 rotates and the lead screw 66 engaged with the worm wheel 64 moves forward and pushes the wedge-shaped plate 68, so that the lower die 210 placed on the wedge-shaped plate 68 rides the inclined surface portion 68a of the wedge-shaped plate 68. It is lifted upward, and the height of the central part of the lower die 210 can be set relatively higher than the both sides of the lower die.

In this way, when the height of the central part of the lower die 210 is relatively increased compared to the two sides, a large stress is induced to be transmitted to the central part of the steel sheet 1 placed on the lower die 210, thereby causing the steel sheet 1 to be damaged. Deflection can be prevented.

1: steel plate 2: steel pipe
10: Lifting platform 12: Hole
14: Guide 16: Guide rail
20: Banding knife 30: Cylinder
40: Support 42: Fixed support
44: Spiral groove 50: Flow support
60: Calibration unit 64: Worm wheel
68: wedge-shaped plate 200: expectation
210: lower die 220: support
230: Upper fixture

Claims (3)

In the banding knife removal device of the JCO steel pipe bending machine for removing the banding knife that is formed into an "○" shaped steel pipe by pressing and impacting the flat steel plate (1) from the steel pipe,
expect(200);
A lower die 210 installed on the upper part of the base 200 and on which the steel plate 1 is placed;
An upper fixture 230 fixedly installed on the upper part of the lower die 210 at a certain distance away;
At least one hydraulic cylinder 30 installed on the upper fixture 230;
An elevating platform (10) located below the upper fixture (230) and moving up and down by driving the hydraulic cylinder (30);
It is fixedly installed on the lower surface of the elevating platform 10, moves up and down by the operation of the elevating platform 10, and presses and impacts the steel plate 1 placed on the lower die 210 to form the flat steel plate ( It includes a banding knife (20) for banding 1) into an “○” shaped steel pipe (2);
At least one support 40 is installed on both sides of the banding knife 20, and the tip of the support 40 is fixed to the upper fixture 230, and the lower end of the support 40 is fixed to the bending knife 20. The JCO steel pipe bending machine is characterized in that it presses and contacts the outer diameter of the steel pipe (2) lifted together with the banding knife (20) during the bending process, and removes the banding knife (20) from the steel pipe (2). Banding knife removal device.
According to clause 1,
The support 40 is;
A fixed support 42 fixed to the lower surface of the upper fixture 230;
a spiral groove (44) recessed at the bottom of the fixed support (42);
A banding knife removal device for a JCO steel pipe bending machine, characterized in that it consists of a floating support (50) screwed to the spiral groove (44) and movable up and down below the fixed support (42).
According to claim 1 or 2,
At least one calibration unit 60 is installed on the lower surface of the lower die 210;
The calibration unit 60 is;
motor (62);
A worm wheel (64) rotating with the power of the motor (62);
A lead screw 66 engaged with the worm wheel 64 and reciprocating in a straight line forward and backward due to the rotation of the worm wheel 64;
It is coupled to the tip of the lead screw 66 and consists of a wedge-shaped plate 68 formed on its upper surface with an inclined surface 68a for surface contact with the inclined surface portion 210a formed on the lower surface of the lower die 210. Thus, the bending knife removal device of the JCO steel pipe bending machine is characterized in that the height of the lower die 210 is adjusted in the process of moving the wedge-shaped plate 68 forward and backward due to the movement of the lead screw 66. .