KR20120033035A - Bending device for swing ring plate - Google Patents

Bending device for swing ring plate Download PDF

Info

Publication number
KR20120033035A
KR20120033035A KR1020100094626A KR20100094626A KR20120033035A KR 20120033035 A KR20120033035 A KR 20120033035A KR 1020100094626 A KR1020100094626 A KR 1020100094626A KR 20100094626 A KR20100094626 A KR 20100094626A KR 20120033035 A KR20120033035 A KR 20120033035A
Authority
KR
South Korea
Prior art keywords
bending
plate
pressing
frame
mold
Prior art date
Application number
KR1020100094626A
Other languages
Korean (ko)
Inventor
이시화
Original Assignee
하나로테크 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 하나로테크 주식회사 filed Critical 하나로테크 주식회사
Priority to KR1020100094626A priority Critical patent/KR20120033035A/en
Priority to PCT/KR2011/004726 priority patent/WO2012043972A1/en
Publication of KR20120033035A publication Critical patent/KR20120033035A/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
    • B21D7/024—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/10—Bending specially adapted to produce specific articles, e.g. leaf springs

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

The present invention relates to a bending device for a swinging plate, and more particularly, a bending groove is formed along an edge to be guided while bending a linear plate cut into a table and a predetermined length, and provided to be rotatable on an upper side of the table. A circular bending frame, a rotating means provided on the table to rotate the bending frame, and pressing means for pressing and bending a linear plate provided on the table to the bending groove of the bending frame in the direction of the bending frame. It is done by
According to the present invention as described above, it is possible to easily bend in accordance with the shape of the bending mold by pressing the pressing means in a certain arc to the linear plate is supplied and rotated, it is easy to manufacture a swinging plate, accordingly the working time And work efficiency can be improved by reducing the cost.

Description

Bending device for swing ring plate

The present invention relates to a bending device, and more particularly, a linear plate supplied to a circular bending frame can be easily bent by pressing an arc rather than a straight line toward the center of rotation of the bending frame to facilitate swinging plates. It relates to a bending device for a swinging plate that can be manufactured.

In general, in the case of construction heavy equipment such as an excavator, it is provided with a turning body provided above the wheel body running on the track, and the driver's seat of the excavator is left and right by allowing the driven body such as the driver's seat connected to the turning body to rotate. It is to be able to play a role of turning movement.

Here, a component called a swinging plate is essentially provided among the elements constituting the structure of the swinging structure, which is to support the swinging body when rotating the driven body such as an excavator driver's seat, which is one of construction heavy equipment. The cylindrical body is fixed to the center of the support hull that covers and supports the upper wheel body forming the trajectory of the track, and the swinging plate is welded and fixed to the upper end side of the cylindrical body.

Such a swinging plate upper side has a structure in which a pivoting drive unit including a ring gear and the like is connected to the swinging plate and is pivoted in connection with a driven body in construction heavy equipment such as a pivoting drive unit and an excavator.

As shown in FIG. 1, a strip-shaped plate contacting the lower end of the ring gear 1 formed at the lower end of the swing driving part is the swinging plate 2 referred to in the present invention.

As one of the methods of obtaining the swinging plate 2, as shown in FIG. 2, the plate-like material 2b having a predetermined size is cut and processed by CNC machining or the like, respectively, and the unit plate 2a having an arc shape. To prepare.

After the unit plate 2a is subjected to the grinding process, the end side of each unit plate 2a is welded to obtain the completed swinging plate 2 having a circular arc shape.

Therefore, when such a working process is performed, the plate-like material 2b is cut by CNC machining by a predetermined curvature to obtain each unit plate 2a, as shown in FIG. It must be generated.

In addition, the welding process work between the unit plate (2a) obtained by each cutting process is carried out, the problem that the machining time by the CNC processing cutting and the welding process of each welding site considerably needs to be pointed out.

Reference numeral A means a weld.

The swinging plate (2) obtained after the welding treatment of a plurality of welding spots to be separated is required to obtain excellent smoothness due to the exact welding state, the smoothness may be different depending on the operator's skill in the work process, There is a problem that reduces the reliability.

In addition, it is possible to implement the swing plate of the exact circular shape only by obtaining the unit plate by the same curvature, it can be different to obtain the unit plate having the exact curvature and length of each unit plate according to the operator's skill In the process, it becomes difficult to implement an accurate circular swing plate.

In addition, there is a problem that greatly reduces the productivity, such as a post-process that is required to perform the CNC machining cutting work again because of inconsistency, which significantly increases the working time.

On the other hand, such a bending technique has often bent small parts having a small diameter, but there was no example of bending and processing a large part such as a swinging plate of a large construction device such as a construction machine. When the width was larger than the thickness of the plate to be bent, no bending was found.

Therefore, the present invention has been made to solve the above problems, and to be bent by supplying a linear plate between the bending mold and the pressing means to manufacture a swinging plate, the pressing means is called the linear plate toward the bending frame By drawing the pressure, it is possible to bend the plate without applying excessive force to the pressurizing means and the bending hole, to prevent the failure, reducing the working time and cost, and provide a bending device for swinging plate that can improve the working efficiency The purpose is to.

And the present invention has a radial width of 50 ~ 300mm and a through thickness of 20 ~ 100mm, the purpose of bending the linear plate to produce a swinging plate of 700 ~ 4000mm in diameter.

The present invention for achieving the above object is a table, a bending groove is formed along the edge to be guided while bending a linear plate cut to a predetermined length, a circular bending frame provided to be rotatable on the upper side of the table, the table Rotation means provided in the rotating means, and a pressing means for bending the linear plate provided in the table is supplied to the bending groove of the bending mold in the direction of the bending frame.

Preferably, the holding piece provided on the lower side of the bending frame to be movable in the center direction from the edge of the bending frame, and the holding cylinder for moving the holding piece to fix the end of the plate supplied to the bending groove to the bending frame It is further provided.

The holding piece is located on the opposite side to which a forming plate is supplied based on the bending mold and the pressing means.

In addition, the bending groove, the width of the center direction at the edge is formed smaller than the width of the linear plate, the depth of the thickness direction is formed larger than the thickness of the linear plate.

In addition, the rotation means is provided with a plurality at regular intervals along the outer circumferential surface of the bending mold, and is rotated in the same manner.

In addition, the rotating means, a rotary motor provided on the table, a rotary gear rotated by the rotary motor, and the lower end of the bending frame is provided with a driven to rotate the bending frame as meshed with the rotating gear is rotated It consists of a gear.

And the pressing means, one end of the pressing body is provided on the table so as to be rotatable in the direction of the bending frame, the pressing roll provided on the pressing body to rotate in contact with the outer surface of the linear plate supplied to the bending frame, and one end The table is rotatably provided, and the other end is rotatably provided to the pressurizing body to move the pressurizing body in the bending frame direction or the opposite direction, thereby moving the linear plate to which the pressing roll is supplied in the bending frame direction. It comprises a pressurized cylinder for pressing and bending.

In addition, a third sensor for checking the change in the radius of the pressing roll by measuring the distance to the outer peripheral surface of the pressing roll is further provided.

And a plurality of guide rollers for guiding the bent plate in contact with the bending groove of the bending frame is further provided on the table.

In addition, a first sensor is further provided on an upper surface of the bending mold to measure a horizontal state of the bending mold.

In addition, a second sensor is further provided at a front table portion of the supply portion of the linear plate provided with the pressing means to determine a change in the radius of the bending mold by measuring a distance from an outer circumferential surface of the bending mold.

As described above, according to the bending device for the swinging plate according to the present invention, the pressing means by pressing a linear plate that is supplied and rotated in a predetermined arc can be easily bent along the shape of the bending frame swinging plate It is a very useful and effective invention that can be easily manufactured, thereby reducing work time and costs, thereby improving work efficiency.

1 is a view showing a conventional turning drive unit,
2 is a view showing a manufacturing form of the swinging plate of the conventional swing drive unit,
3 is a view showing a bending device for a swinging plate according to the present invention,
Figure 4 is a view showing a side view of the bending device for swinging plate according to the present invention,
5 is a view showing a rotation means of the bending device for swinging plate according to the present invention,
6 is a view showing the pressing means of the bending device for a swinging plate according to the present invention,
7 is a view showing a state in which a sensor is further provided in the bending device for swinging plate according to the present invention,
8 is a diagram illustrating a bending process of the bending device for the swinging plate according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

In addition, the present embodiment is not intended to limit the scope of the present invention, but is presented by way of example only, and various modifications may be made without departing from the technical gist of the present invention.

3 is a view illustrating a bending device for a swinging plate according to the present invention, Figure 4 is a view showing a side view of the bending device for a swinging plate according to the present invention, Figure 5 is a swinging plate according to the present invention Figure 6 is a view showing a rotation means of the bending device for the present invention, Figure 6 is a view showing the pressing means of the bending device for a swinging plate according to the present invention, Figure 7 is a sensor in the bending device for a swinging plate according to the present invention It is a view showing a further provided state, Figure 8 is a view showing the bending process of the bending device for swinging plate according to the present invention.

As shown in the figure, the bending device for the swinging plate 10 is composed of a table 100, the bending mold 200, the rotating means 300 and the pressing means 400.

The bending frame 200 is provided to be rotatable on the upper side of the table 100 in a circular shape, the bending groove 210 is formed along the edge.

The bending groove 210 is to be guided by placing a linear plate cut to a predetermined length, the linear plate is bent while being supplied and rotated between the bending frame 200 and the pressing means 400.

And the rotating means 300 is provided on the table 100 and the forward and reverse rotation of the bending mold 200, the pressing means 400 is provided on the table 100 is supplied to the bending groove 210 of the bending mold 200 The linear plate is bent by bending in the direction of the bending mold 200.

Accordingly, the linear plate supplied to the bending groove 210 on the table 100 is bent in the same shape as the bending groove 210 as the pressing means 400 presses in the direction of the bending mold 200.

The plate bent in this way is used to make the swinging plate, and can be easily circularly bent by the bending device 10 for the swinging plate, thereby reducing the overall work time and cost, and improve the work efficiency. have.

Here, the bending groove 210 of the bending mold 200 has a width (W) in the center direction at the edge formed to be smaller than the width (w) of the linear plate, and the depth (T) in the thickness direction is the thickness (t) of the linear plate. Is formed larger.

The width W of the bending groove 210 is formed to be small, so that the pressing means 400 presses only the outer side of the linear plate, thereby easily bending the linear plate.

The depth T of the bending groove 210 is greater than the thickness t of the linear plate to prevent the plate from being separated from the bending groove 210 during bending.

3 to 5, as shown in Figure 3 to 5, is provided with a plurality of at regular intervals along the outer circumferential surface of the bending mold 200, the table 100 so that the rotating end is in contact with the bending mold 200 As installed in the same rotation is to rotate the bending mold 200.

The rotating means 300 is composed of a rotary motor 310, a rotary gear 320 and a driven gear 330, the rotary motor 310 is provided on the table 100.

The rotary gear 320 is rotated globally by the rotary motor 310, and the driven gear 330 is provided at the lower end of the bending mold 200 to be engaged with the rotary gear 320 and rotated so that the bending frame 200 may be rotated. Will rotate.

Here, the holding mold 610 and the holding cylinder 600 is further provided in the bending mold 200 to fix one end of the linear plate supplied with the bending mold 200, and the holding piece 610 and the holding cylinder ( By 600, the linear plate is rotated in the same state fixed to the bending mold 200.

First, the holding piece 610 is provided on the lower side of the bending frame 200 to be movable in the center direction from the edge of the bending frame 200, the holding cylinder 600 by moving the holding piece 610 to the bending groove An end of the plate supplied to 210 is fixed to the bending mold 200.

As such, the bending mold 200 is rotated while the linear plate is fixed, and the pressing means 400 presses the linear plate to be rotated to be bent in the same shape as the bending groove 210.

The holding piece 610 is located on the opposite side to which the forming plate is supplied based on the bending mold 200 and the pressurizing means 400, and holding the linear plate to the bending mold 200 and holding the same rotating piece ( This is to prevent the 610 from colliding with the pressing means 400.

Here, the bending mold 200 is preferably reciprocally rotated so that the holding piece 610 does not collide with the pressing means 400.

In addition, the pressing means 400 is composed of a pressing body 410, a pressing roll 420 and the pressure cylinder 430, as shown in FIG.

One end of the pressing body 410 is provided on the table 100 so as to be rotatable in the direction of the bending mold 200, and the other end is rotated by drawing an arc on the other end thereof as a rotating shaft.

And the pressing roll 420 is provided in the pressing body 410 to be rotated in contact with the outer surface of the linear plate supplied to the bending mold 200, the other end of the pressing body 410 is rotated in an arc to rotate the front It is provided to enable.

Both sides of the pressure cylinder 430 are installed to be rotatable, one end is provided to be rotatable in the table 100, the other end is provided to be rotatable in the pressure body 410.

The pressure cylinder 430 presses the linear plate supplied with the pressure roll 420 in the direction of the bending mold 200 to bend as the pressure body 410 moves in the direction of the bending mold 200 or vice versa. do.

At this time, the pressure roll 420 is to press the linear plate while drawing an arc, the pressure cylinder 430 is pushed on the other end of the pressure body 410 as the pressure body 410 moves in an arc to press the pressure roll 420 Drawing this arc will pressurize the linear plate.

As such, when the pressing roll 420 pressurizes the linear plate while drawing an arc, after pressing the plate, it is possible to easily disperse the force reacted by the pressing means 400 to prevent failure of the pressing means 400 and It can be minimized.

And the third sensor 800 to determine the radius change of the pressure roll 420 by measuring the distance to the outer peripheral surface of the rotating pressure roll 420 is further provided, the pressure roll to contact and press the outer surface of the linear plate (420) The quality of the outer peripheral surface can be improved in real time by preventing bending failure.

In addition, a plurality of guide rollers 500 are further disposed along the edge of the bending mold 200 to prevent the bent plate from being separated from the bending mold 200.

The guide roller 500 is rotatably provided on the table 100 to guide one or more of the outer surface or the upper surface of the bent plate to be in contact with the bending groove 210 so that the plate is separated from the bending frame 200. It prevents it and keeps the bending shape.

As shown in FIG. 7, the first sensor 700 is further provided on the upper surface of the bending mold 200 to measure the horizontal state of the bending mold 200.

This is to detect that the pressing force is continuously applied to the bending mold 200 by the pressing means 400, so that the shape is deformed. It is desirable to prevent and minimize this problem as the calibration process and time increases accordingly.

In addition, the second sensor 710 is further provided on the front table portion of the linear plate provided with the pressing means 400 to measure the distance from the outer circumferential surface of the bending mold 200 to rotate the radius of the bending mold 200. Confirm the change.

This is to measure the deformation of the outer peripheral surface of the bending mold 200, in particular to measure the deformation of the bending groove 210 to maintain a constant bending rate of the linear plate to prevent and minimize the occurrence of defects in concentricity.

Looking at the operation state of the bending device for the swinging plate 10, as shown in Figure 8, first, the end of the linear plate having a predetermined length between the bending frame 200 and the pressing means 400 in front Rough on.

Then, one end of the linear plate is mounted on the bending groove 210 of the bending mold 200 rotated by the rotation means 300, and fixed to the bending groove 210 by the pressing means 400.

At this time, the end of the linear plate is fixed to the bending mold 200 by the holding cylinder 600 and the holding piece 610.

The bending frame 200 having one end of the linear plate fixed thereto is rotated by the rotating means 300, and the pressing cylinder 430 of the pressing means 400 moves the pressing body 410 in the direction of the bending frame 200. Pressing roll 420 to press the linear plate is made to be bending.

The bending may be bent to the other end of the plate, and the second bending may be achieved by stopping the rotation so that the holding piece 610 does not touch the pressing means 400 to finish the bending or rotate in the opposite direction.

In addition, the first sensor 700, the second sensor 710, and the third sensor 800 measure the flatness of the bending mold 200, the concentricity of the bending mold 200, and the concentricity of the pressing roll 420 during the bending process. To respond immediately in case of failure.

Here, the length of the plate is bent along the bending groove 210 so that one end and the other end may be in contact with each other, and an edge bending means (not shown) may be further provided to pre-bend both ends before bending. have.

In addition, when a defect occurs in the concentricity of the plate to be bent, the rotating means 300 can be rotated forward and backward to correct the concentricity to improve the working efficiency.

As such, the bending device for the swinging plate 10 has a radial width of 50 to 300mm and a through thickness of 20 to 100mm, and the linear plate is bent to manufacture a swinging plate having a diameter of 700 to 4000mm.

10: bending device 100: table
200: bending frame 210: bending groove
300: rotation means 310: rotation motor
320: rotating gear 330: driven gear
400: pressurizing means 410: pressurized body
420: pressure roll 430: pressure cylinder
500: guide roller 600: holding cylinder
610: holding piece 700: first sensor
710: second sensor 800: third sensor
W: width of bending groove T: depth of bending groove
w: width of plate t: thickness of plate

Claims (11)

table;
A circular bending frame having a bending groove formed along an edge to be guided while the linear plate cut to a predetermined length is bent, and rotatably provided on an upper side of the table;
Rotating means provided on the table to rotate the bending mold; And
And a pressurizing means provided on the table and pressurizing the linear plate supplied to the bending groove of the bending mold in the bending mold direction to bend the linear plate.
The method of claim 1,
A holding piece provided on a lower side of the bending mold so as to be movable in a center direction from an edge of the bending mold; And
And a holding cylinder for moving the holding piece to fix an end portion of the plate supplied to the bending groove to the bending frame.
The method of claim 2, wherein the holding piece,
Bending device for a swinging plate, characterized in that located on the opposite side to which the forming plate is supplied based on the bending frame and the pressing means.
The method of claim 1, wherein the bending groove,
The width of the central direction at the edge is formed smaller than the width of the linear plate, the depth of the thickness direction is bending device for a swinging plate, characterized in that is formed larger than the thickness of the linear plate.
According to claim 1, The rotating means,
A plurality of swinging plate bending apparatus is provided along the outer circumferential surface of the bending frame at regular intervals, the same rotation.
According to claim 1, The rotating means,
A rotating motor provided on the table;
A rotary gear rotated by the rotary motor; And
And a driven gear provided at the lower end of the bending frame to rotate the bending frame as it is engaged with the rotary gear and rotated.
The method of claim 1, wherein the pressing means,
A pressing body having one end provided on the table to be rotatable in the bending frame direction;
A press roll provided in the press body to rotate in contact with an outer surface of the linear plate supplied to the bending mold; And
One end is rotatably provided on the table, and the other end is rotatably provided on the pressing body to move the pressing body in the bending frame direction or the opposite direction, thereby bending the linear plate to which the pressing roll is supplied. Bending device for a swing ring plate comprising a pressurized cylinder for bending by pressing.
The method of claim 7, wherein
And a third sensor for measuring a distance from an outer circumferential surface of the pressing roll to be rotated to check a radius change of the pressing roll.
The method of claim 1,
And a plurality of guide rollers on the table for guiding the bent plate to be in contact with the bending groove of the bending frame.
The method of claim 1,
The bending device for a swinging plate, characterized in that the first sensor is further provided on the upper surface of the bending frame to measure the horizontal state of the bending frame.
The method of claim 1,
Swinging plate, characterized in that for measuring the change in the radius of the bending frame by measuring the distance to the outer peripheral surface of the bending frame is further provided with a second sensor in the front table portion of the linear plate provided with the pressing means Bending Device
KR1020100094626A 2010-09-29 2010-09-29 Bending device for swing ring plate KR20120033035A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020100094626A KR20120033035A (en) 2010-09-29 2010-09-29 Bending device for swing ring plate
PCT/KR2011/004726 WO2012043972A1 (en) 2010-09-29 2011-06-29 Bending apparatus for a swing ring plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100094626A KR20120033035A (en) 2010-09-29 2010-09-29 Bending device for swing ring plate

Related Child Applications (1)

Application Number Title Priority Date Filing Date
KR1020120084518A Division KR20120099355A (en) 2012-08-01 2012-08-01 Bending device for swing ring plate

Publications (1)

Publication Number Publication Date
KR20120033035A true KR20120033035A (en) 2012-04-06

Family

ID=45893375

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020100094626A KR20120033035A (en) 2010-09-29 2010-09-29 Bending device for swing ring plate

Country Status (2)

Country Link
KR (1) KR20120033035A (en)
WO (1) WO2012043972A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103394565A (en) * 2013-07-15 2013-11-20 周俊雄 Semi-automatic bending equipment of work tips

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113305184B (en) * 2021-04-23 2023-06-30 上海钱豹机电设备有限公司 Section bar bending device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITRM20040402A1 (en) * 2004-08-05 2004-11-05 Cml Int Spa VICE FOR LOCKING AN ELONGATED ELEMENT TO BE CURVED ON A BENDING MACHINE MATRIX.
KR100858864B1 (en) * 2007-12-28 2008-09-17 하나로테크 주식회사 The swring plate manufacture method and the goods
IT1391476B1 (en) * 2008-10-28 2011-12-23 Cml Int Spa CURVATURI MACHINE WITH PERFECT TRANSMISSION OF THE MOTORCYCLE TO THE MATRIX

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103394565A (en) * 2013-07-15 2013-11-20 周俊雄 Semi-automatic bending equipment of work tips

Also Published As

Publication number Publication date
WO2012043972A1 (en) 2012-04-05

Similar Documents

Publication Publication Date Title
KR101331423B1 (en) Jig apparatus for laser welding
KR101334061B1 (en) Stretch bending device
KR101644012B1 (en) Bending Apparatus for Pipe-shaped Member And Method for Banding
CN102267042A (en) Pocket machining device and method for machining integral bearing retainer of wind power equipment
CN211193433U (en) Roller processing equipment
KR101461794B1 (en) Apparatus for correcting shape of material
CN209792895U (en) Circular tube cutting machine
US20130153549A1 (en) Apparatus and method for manufacturing a swing-ring plate
KR20120033035A (en) Bending device for swing ring plate
KR101777592B1 (en) auto straightening equipments and method for metal rod
KR101771048B1 (en) Thread rolling machine and thread rolling method
KR20120099355A (en) Bending device for swing ring plate
KR100761739B1 (en) Grinder in welder
JP5937958B2 (en) Metal plate bending apparatus and bending method
CN204018434U (en) A kind of hydraulic pressure guide rail straightener
KR101638346B1 (en) Bumper setting apparatus for vehicle
JP5180394B1 (en) Waist roll device for circular saw
KR101204480B1 (en) Piercing device for roll forming system
JP2013027941A (en) Beveling device for square steel pipe, and so forth
JP2013013973A (en) Beveling device for square steel pipe and the like
JP6336372B2 (en) Bending roll device
KR20030062305A (en) Automatic welding system for tank
KR100979704B1 (en) Swing ring plate structure for the construction heavy
JP2001150308A (en) Surface grinding device for h-shape steel
KR101210780B1 (en) The grinding machine which has position controls by servo drive

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
A107 Divisional application of patent
E902 Notification of reason for refusal
E601 Decision to refuse application