JP2008188621A - Bending device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bending device with which the working accuracy of a preliminarily bending is improved and the quality of a product is uniformly raised in hemming work. <P>SOLUTION: This device is a bending device 1 and provided with a supporting table 10, a normal bending tool holder 30, a first linkage mechanism 40 for connecting the normal bending tool holder 30 with the supporting table 10, a preliminarily bending tool holder 50, a second linkage mechanism 60 for connecting the preliminarily bending tool holder 50 with the supporting table 10 and a third linkage mechanism 70 for connecting the normal bending tool holder 30 with the preliminarily bending tool holder 40. Because the normal bending tool holder 30 is moved by being guided with the first linkage mechanism 40 and also the preliminarily bending tool holder 50 is moved by being guided with the second linkage mechanism 60, this device is constituted so as to bend a flange part by bringing the normal bending tool 31 into contact with the flange part from the upper part after bending the flange part of a workpiece by bringing the preliminarily bending tool 51 into contact with the flange part from the oblique upper part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bending apparatus for hemming an edge of a plate-like workpiece.

  As a method of joining the outer panel and the inner panel constituting the door panel of the automobile, the outer panel and the inner panel are overlapped, and the edge of the outer panel is hemmed and bent, and the inner panel is joined at the edge of the outer panel. There is a joining method in which the edges of the outer panel and the inner panel are joined by sandwiching the edges of the outer panel.

As shown in FIG. 8, the bending apparatus 100 for hemming the edge of the outer panel includes a support base 110, a hydraulic cylinder 120 provided on the support base 110, and a book to which a main bending tool 131 is attached. There is a configuration in which a bending tool holder 130 and a preliminary bending tool holder 150 to which a preliminary bending tool 151 is attached are provided, and an outer panel and an inner panel are arranged in front of the support base 110.
In the conventional bending apparatus 100, the main bending tool holder 130 and the support base 110 are connected by the first link mechanism 140, and the preliminary bending tool holder 150 and the support base 110 are connected by the second link mechanism 160. The main bending tool holder 130 and the preliminary bending tool holder 150 are connected by a third link mechanism 170 (see, for example, Patent Document 1).

In the above-described conventional bending apparatus 100, the first link mechanism 140 is a parallel link having upper and lower link members 141 and 142, and connects the two fulcrum points on the main bending tool holder 130 side and the support base 110 side. The ellipses Y1 and Y2 are extended in the vertical direction.
The second link mechanism 160 is a parallel link having front and rear link members 161 and 162, and line segments X1 and X2 connecting the two fulcrums on the preliminary bending tool holder 150 side and the support base 110 side are horizontal. It is extended in the direction.

  The tip of the rod 121 of the hydraulic cylinder 120 is connected to the first link mechanism 140, and the bending tool holder 130 is moved to the first link mechanism 140 by extending the rod 121 of the hydraulic cylinder 120. While being guided and lowered toward the outer panel, the preliminary bending tool holder 150 is guided by the second link mechanism 160 in conjunction with the main bending tool holder 130 and moves horizontally toward the outer panel. It is configured as follows.

  At the edge of the outer panel, a flange portion is raised vertically in advance. In the conventional bending apparatus 100 described above, the preliminary bending tool 151 abuts against the flange portion of the outer panel from the horizontal direction, and the flange portion After bending and tilting, the main bending tool 51 is configured to be bent by contacting the flange portion from above.

Japanese Patent No. 2569186 (page 2, right column, lines 30-39, FIG. 1)

  In the conventional bending apparatus 100 shown in FIG. 8, the blade surface 153 of the preliminary bending tool 151 is an inclined surface inclined obliquely downward toward the front, and this blade surface contacts the flange portion from the horizontal direction. Thus, the flange portion is bent at a desired angle along the inclination of the blade surface 153.

Here, when the preliminary bending tool 151 starts to contact the flange portion, all the pressing force from the preliminary bending tool 151 acts on the flange portion as a horizontal component, which is excessive from the horizontal direction with respect to the flange portion. A large pressing force is applied.
Therefore, in the conventional bending apparatus 100 described above, the outer panel may be displaced or the outer panel or the inner panel may be distorted due to the pressing force from the horizontal direction during the preliminary bending process. There is a problem that the quality of the product is not uniform and the quality of the product varies.

  Therefore, the present invention has an object to provide a bending apparatus capable of solving the above-described problems, improving the accuracy of preliminary bending in hemming, and improving the quality of products uniformly. .

  In order to solve the above-mentioned problems, the present invention is a bending apparatus for hemming an edge of a plate-like workpiece, and a support base, a drive device provided on the support base, and a main bending tool are attached. The main bending tool holder, the first link mechanism that connects the main bending tool holder and the support base, the pre-bending tool holder to which the pre-bending tool is attached, and the pre-bending tool holder and the support base. A second link mechanism and a third link mechanism for connecting the final bending tool holder and the pre-bending tool holder, and the bending tool holder is guided to the first link mechanism by the driving force of the driving device. The preliminary bending tool holder is guided by the second link mechanism in conjunction with the main bending tool holder and moved obliquely downward toward the work. The tool is configured to abut against the flange raised from the edge of the workpiece obliquely from above and bend the flange, and then the bending tool abuts against the flange from above to bend the flange. It is characterized by being.

  In this configuration, the pre-bending tool is configured to abut against the flange portion of the workpiece obliquely from above and perform pre-bending of the flange portion. When the pre-bending tool starts to contact the flange portion, the pre-bending tool is configured. Since the pressing force from the tool is distributed in horizontal and vertical components, the pressing force from the horizontal direction against the flange portion is reduced, and a constant pressing force acts on the flange portion obliquely from above at the time of preliminary bending. It will be. Therefore, it is possible to prevent the workpiece from being displaced or the workpiece from being distorted during the preliminary bending.

  In the bending apparatus described above, the first link mechanism is a parallel link, and a line segment connecting the two fulcrum points on the bending tool holder side and the support base side is extended in the vertical direction. The two link mechanisms are parallel links, and can be configured such that the line segments connecting the two fulcrums on the preliminary bending holder side and the support base side are extended obliquely downward toward the workpiece side. .

  In this configuration, the main bending tool holder and the pre-bending holder are moved toward the workpiece using the parallel link, and the mechanism for moving the main bending tool holder and the pre-bending tool is a simple configuration. The manufacturing cost of the bending apparatus can be reduced, and the entire apparatus can be configured compactly.

  In the bending apparatus described above, the driving device is an electric motor, and a fourth link mechanism that connects the output shaft of the driving device and the first link mechanism is provided, and the driving force of the driving device is the fourth. By being transmitted to the first link mechanism through the link mechanism, the first link mechanism can be configured to move the bending tool holder.

  In this configuration, an electric motor is used as the drive device, and the rotation torque and the rotation amount of the output shaft can be easily controlled. As a result, the amount of movement of the main bending tool holder can be easily controlled, and the pressing force when the main bending tool bends the flange portion of the workpiece can be finely adjusted. Can do.

  Further, by using an electric motor as the drive device, it is not necessary to attach a drive source such as a hydraulic unit to the bending device, so that the bending device can be made compact.

  According to the bending apparatus of the present invention, when the preliminary bending tool abuts against the flange portion of the workpiece from above obliquely, when the preliminary bending tool starts to abut against the flange portion, the pressing force from the horizontal direction against the flange portion And a constant pressing force acts on the flange portion obliquely from above at the time of preliminary bending. Accordingly, the workpiece is prevented from being displaced or the workpiece is distorted during pre-bending, so that the machining accuracy of the hemming process can be improved and the quality of the product can be improved uniformly.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
FIG. 1 is an overall perspective view showing the bending apparatus of the present embodiment. FIG. 2 is a view of the bending apparatus of this embodiment as viewed from the front. 3 to 7 are side views showing respective stages of hemming in the bending apparatus of the present embodiment. FIG. 3A is a panel installation stage, and FIG. 4A is a preliminary bending tool in the preliminary bending stage. 5A shows a state where the pre-bending is completed in the pre-bending stage, FIG. 6A shows a state where the main bending tool abuts on the flange part, and FIG. (A) is a state in which the main bending is completed in the final bending stage, and (b) in each figure is an enlarged view showing the processed state of the flange portion in each stage.
In the following description, the front / rear / left / right direction corresponds to the front / rear / left / right direction shown in FIG. 1, and the front / rear / left / right direction is set for convenience in describing the bending apparatus. The configuration of the processing apparatus is not limited.

  In the present embodiment, as an example of the present invention, a bending apparatus for joining a plate-like outer panel and an inner panel constituting an automobile door panel will be described. The outer panel which is a processing target of the bending apparatus according to the present embodiment corresponds to a “workpiece” in the claims.

[Overall configuration of bending equipment]
As shown in FIG. 1, the bending apparatus 1 includes a support base 10, a driving device 20 provided on the support base 10, a main bending tool holder 30 to which a main bending tool 31 is attached, and a preliminary bending tool 51. And a pre-bending tool holder 50 to which is attached.
In this bending apparatus 1, the main bending tool holder 30 and the support base 10 are connected by a first link mechanism 40, and the preliminary bending tool holder 50 and the support base 10 are connected by a second link mechanism 60. The bending tool holder 30 and the preliminary bending tool holder 50 are connected by a third link mechanism 70, and the output shaft 21 of the driving device 20 and the first link mechanism 40 are connected by a fourth link mechanism 80.

When the outer panel OP and the inner panel IP are joined using the bending apparatus 1, the outer panel OP and the inner panel IP are arranged in an overlapped state (see FIG. 3B), and the outer panel OP When the preliminary bending tool 51 bends the flange portion OP1 raised at the edge portion, the preliminary bending of the flange portion OP1 is performed (see FIG. 5B).
Thereafter, the main bending tool 31 bends the pre-bent flange portion OP1, whereby the main bending of the flange portion OP1 is performed (see FIG. 7B).
In this way, the edge of the outer panel OP is hemmed, so that the edge of the outer panel OP sandwiches the edge of the inner panel IP, and the edge between the outer panel OP and the inner panel IP is It becomes a joined state.

(Structure of support base)
As shown in FIG. 1, the support 10 is a base member that supports each component of the bending apparatus 1 and is installed at a predetermined installation location. A work table D (see FIG. 3B) on which the outer panel OP and the inner panel IP are placed is disposed in front of the support base 10.

(Configuration of drive unit)
As shown in FIG. 2, the drive device 20 includes an electric servo motor 22 and a gear mechanism 23 connected to the output portion of the servo motor 22, and the gear mechanism 23 is provided on the left side surface of the support base 10. The servo motor 22 is attached to the upper surface of the gear mechanism 23.
An output shaft 21 (see FIG. 1) protrudes from the right side surface of the gear mechanism 23, and the output shaft 21 passes through the inside of the support base 10 in the left-right direction, and the right end portion extends from the right side surface of the support base 10. It protrudes.

In this drive device 20, the output (rotational force) generated at the output portion of the servo motor 22 is transmitted to the output shaft 21 by various gears incorporated in the gear mechanism 23, so that the output shaft 21 rotates around the axis. Is configured to do.
Further, the rotational torque and amount of rotation of the output shaft 21 can be easily set by a control unit (not shown) connected to the servo motor 22.

(Configuration of this bending tool holder)
As shown in FIG. 1, the bending tool holder 30 is a plate-like member that is disposed in front of the support base 10 and that each plane is directed in the left-right direction.
The rear portion of the main bending tool holder 30 is connected to the upper front side of the support base 10 via a first link mechanism 40 described later.

A main bending tool 31 is attached to the front surface of the main bending tool holder 30.
The main bending tool 31 is a tool for performing the main bending of the outer panel OP (see FIG. 7B). The main bending tool 31 is a plate-like member that is wide in the left-right direction, and the lower end surface is a horizontal blade surface 33 that contacts the outer panel OP.

(Configuration of pre-bending tool holder)
As shown in FIG. 1, the preliminary bending tool holder 50 is disposed in front of the support base 10 and below the main bending tool holder 30, and is a member that is wide in the left-right direction.
The lower part of the preliminary bending tool holder 50 is connected to the lower front side of the support 10 via a second link mechanism 60 described later. The upper part of the preliminary bending tool holder 50 is connected to the first link mechanism 40 via a third link mechanism 70 described later.

A preliminary bending tool 51 is attached to the front surface of the preliminary bending tool holder 50.
The preliminary bending tool 51 is a tool for performing preliminary bending of the outer panel OP (see FIG. 5B). The preliminary bending tool 51 is a plate-like member that is wide in the left-right direction, and an inclined surface that is inclined obliquely downward at an angle of 45 degrees toward the front is formed at a portion protruding forward from the upper part. The inclined surface is a blade surface 53 that comes into contact with the outer panel OP.

(Configuration of the first link mechanism)
As shown in FIG. 7A, the first link mechanism 40 is a parallel link that connects the bending tool holder 30 and the support 10, and an upper link member 41 and a lower link that are arranged vertically. Member 42.
The first link mechanism 40 is provided on each of the left and right sides of the support base 10 (see FIG. 1). Since each 1st link mechanism 40 and 40 is the same structure, in the following description, the 1st link mechanism 40 on the right side is demonstrated and description is abbreviate | omitted about the 1st link mechanism 40 on the left side.

  The upper link member 41 is a plate-like member extending in the front-rear direction, the front end is pivotally supported by a pin 41a on the rear upper side of the bending tool holder 30, and the intermediate portion in the front-rear direction is a support base. 10 is pivotally supported by a pin 41b on the front upper side.

  The lower link member 42 is an inverted triangular member in a side view, and a corner portion on the upper front side is pivotally supported by a lower rear portion of the bending tool holder 30 and a pin 42a, and a corner portion on the upper rear side. Is pivotally supported by the front middle portion of the support base 10 and a pin 42b.

  In the first link mechanism 40, a line segment Y1 connecting the two fulcrum points (the axial centers of the pins 41a and 42a) on the main bending tool holder 30 side is extended in the vertical direction. Further, a line segment Y2 connecting the two fulcrums on the support base 10 side (the axial centers of the pins 41b and 42b) is extended in the vertical direction.

(Configuration of second link mechanism)
As shown in FIG. 7A, the second link mechanism 60 is a parallel link that connects the preliminary bending tool holder 50 and the support base 10, and the front link member 61 and the rear link disposed in the front-rear direction. And a member 62.
The second link mechanism 60 is provided on each of the left and right sides of the support base 10 (see FIG. 1). Since the second link mechanisms 60 and 60 have the same configuration, in the following description, the second link mechanism 60 on the right side will be described, and the description of the second link mechanism 60 on the left side will be omitted.

  The front link member 61 is a plate-like member extending in the vertical direction. The upper end portion is pivotally supported by a pin 61 a on the lower front side of the preliminary bending tool holder 50, and the lower end portion is a lower portion of the support base 10. The front side is pivotally supported by a pin 61b.

  The rear link member 62 is a plate-like member extending in the vertical direction. The upper end portion is pivotally supported by a pin 62a on the lower rear side of the preliminary bending tool holder 50, and the lower end portion is supported by the pin 61b. Also, it is pivotally supported by a pin 62b on the lower front side of the support base 10 at the rear.

In the second link mechanism 60, a line segment X1 connecting two fulcrum points (axial centers of the pins 61a and 62a) on the preliminary bending tool holder 50 side extends obliquely downward toward the front of the support base 10. Further, a line segment X2 connecting the two fulcrums on the support base 10 side (the axial center of the pins 61b and 62b) extends obliquely downward toward the front of the support base 10, and this line segment X2 is the line segment X1. It is parallel to.
In the present embodiment, the line segments X1 and X2 are inclined in parallel at an angle of 45 degrees obliquely downward, and are inclined at the same angle as the blade surface 53 of the preliminary bending tool 51.

(Configuration of third link mechanism)
As shown in FIG. 7A, the third link mechanism 70 is a toggle link that connects the main bending tool holder 30 and the preliminary bending tool holder 50, and the front end portion is connected to the preliminary bending tool holder 50, A connecting link member 71 whose rear end is connected to the first link mechanism 40 is provided.
The third link mechanism 70 is provided on each of the left and right sides of the support base 10. Since the third link mechanisms 70 and 70 have the same configuration, in the following description, the right third link mechanism 70 will be described, and the description of the left third link mechanism 70 will be omitted.

The connecting link member 71 is a plate-like member extending in the front-rear direction, and the front end portion is pivotally supported on the upper portion of the preliminary bending tool holder 50 by a pin 71a.
Further, the rear end portion of the connecting link member 71 is pivotally supported by a lower end corner portion of the lower link member 42 of the first link mechanism 40 so as to be rotatable by a pin 71b. It is connected to the main bending tool holder 30 via a link member 42.

(Configuration of the fourth link mechanism)
As shown in FIG. 7A, the fourth link mechanism 80 is a toggle link that connects the output shaft 21 of the drive device 20 and the first link mechanism 40, and is a first link member that is connected vertically. 81 and a second link member 82 are provided.
The fourth link mechanism 80 is provided on each of the left and right sides of the support base 10 (see FIG. 1). Since the fourth link mechanisms 80 and 80 have the same configuration, in the following description, the right fourth link mechanism 80 will be described, and the description of the left fourth link mechanism 80 will be omitted.

The first link member 81 is a plate-like member extending in the vertical direction, and the upper end is pivotally supported by the pin 81a at the rear end of the upper link member 41 of the first link mechanism 40, The lower end is pivotally supported at the tip of the second link member 82 by a pin 81b.
In this way, toggle links are configured between the upper link member 41 and the first link member 81 and between the first link member 81 and the second link member 82.

  The second link member 82 is a plate-like member whose base is attached to the right end of the output shaft 21 and whose tip is pivotally supported by a lower end of the first link member 81 with a pin 82a. It is configured to rotate together with the output shaft 21.

In the fourth link mechanism 80, the second link member 82 rotates with the rotation of the output shaft 21, and the tip portion thereof is displaced vertically, whereby the first link member 81 moves in the vertical direction. Since the upper end portion of the first link member 81 is connected to the rear end portion of the upper link member 41 of the first link mechanism 40, the upper link member 41 moves when the first link member 81 moves up and down. Tilts about the pin 41b as the center of rotation.
As described above, the driving force of the driving device 20 is configured to be transmitted to the upper link member 41 of the first link mechanism 40 via the fourth link mechanism 80.

[Hemming by bending machine]
Next, hemming processing using the bending apparatus 1 of the present embodiment shown in FIG. 1 will be described by taking as an example a case where an outer panel and an inner panel of an automobile are joined. In addition, the rotation direction in the following description corresponds to the rotation direction when the bending apparatus is viewed from the right side (the state shown in FIGS. 3A to 7A).

(Panel installation stage)
First, from the state of the bending apparatus 1 shown in FIG. 7A, when the servo motor 22 is driven and the output shaft 21 is rotated counterclockwise, as shown in FIG. The two link members 82 are rotated counterclockwise, and the tip of the second link member 82 is lowered.

  As a result, the first link member 81 connected to the distal end portion of the second link member 82 is lowered, and the upper link member 41 connected to the upper end portion of the first link member 81 has the pin 41b as the center of rotation. The rear end is lowered, and the front end is raised and tilted. Further, the main bending tool holder 30 connected to the front end portion of the upper link member 41 rises while being displaced rearward.

Further, the lower link member 42 connected to the bending tool holder 30 rotates counterclockwise around the pin 42b as a rotation center.
Thereby, the connecting link member 71 connected to the lower link member 42 is raised, and the preliminary bending tool holder 50 connected to the connecting link member 71 is also raised.

  In the state of Fig.3 (a), the upper side link member 41 and the 1st link member 81 are arrange | positioned at linear form, and the main bending tool holder 30 and the preliminary | backup bending tool holder 50 are arrange | positioned in the highest position. In this state, the drive of the servo motor 22 is stopped.

Thus, after raising the main bending tool holder 30 and the pre-bending tool holder 50 from the state of the bending apparatus 1 shown in FIG. 7A, as shown in FIG. 3B, the outer panel OP And the inner panel IP are placed on the work table D in a stacked state. A flange portion OP1 is raised in advance at the edge of the outer panel OP.
When the outer panel OP and the inner panel IP are placed on the work table D, the main bending tool 31 and the preliminary bending tool 51 are retracted from the vicinity of the work table D, so that the work can be easily performed on the work table D. Yes.

(Preliminary bending stage)
Subsequently, when the servo motor 22 is driven and the output shaft 21 is rotated clockwise from the state of the bending apparatus 1 shown in FIG. 3A, as shown in FIG. The two link member 82 rotates clockwise, and the tip of the second link member 82 rises.

  As a result, the first link member 81 connected to the distal end portion of the second link member 82 rises, and the upper link member 41 connected to the upper end portion of the first link member 81 has the pin 41b as the center of rotation. The rear end part rises and the front end part descends and tilts. Further, the main bending tool holder 30 connected to the front end portion of the upper link member 41 is lowered as the upper link member 41 is tilted.

  At this time, the first link mechanism 40 that connects the main bending tool holder 30 and the support base 10 connects the line Y1 connecting the two fulcrums on the main bending tool holder 30 side and the two fulcrums on the support base 10 side. Since the elliptical line segment Y2 is a parallel link extending in the vertical direction, the bending tool holder 30 is guided to the first link mechanism 40 without changing the posture from the state of FIG. And descend. That is, the blade surface 33 of the bending tool 31 is lowered while maintaining a horizontal state.

The lower link member 42 connected to the bending tool holder 30 rotates clockwise around the pin 42b as a rotation center.
As a result, the connecting link member 71 connected to the lower link member 42 descends obliquely toward the front, and the preliminary bending holder 50 connected to the connecting link member 71 is also inclined forward. To descend. That is, the preliminary bending tool holder 50 is moved obliquely downward toward the front in conjunction with the main bending tool holder 30.

At this time, the second link mechanism 60 that connects the preliminary bending tool holder 50 and the support base 10 connects the line segment X1 connecting the two fulcrums on the preliminary bending tool holder 50 side with the two fulcrums on the support base 10 side. Since the ellipse line segment X2 is a parallel link extending obliquely downward toward the front of the support base 10, the preliminary bending tool holder 50 can be changed without changing its posture from the state of FIG. Then, it is guided by the second link mechanism 60 and descends obliquely.
In the present embodiment, the line segments X1 and X2 are inclined in parallel at an angle of 45 degrees obliquely downward toward the front, so that the blade surface 53 of the preliminary bending tool 51 is obliquely downward toward the front. While maintaining an inclination angle of 45 degrees, it descends diagonally toward the front.

  In this manner, the main bending tool holder 30 is lowered from the state of the bending apparatus 1 shown in FIG. 3A, and the preliminary bending tool holder 50 is lowered obliquely toward the front, whereby FIG. As shown in b), the blade surface 53 of the preliminary bending tool 51 comes into contact with the flange portion OP1 of the outer panel OP from obliquely above.

  Further, when the output shaft 21 is rotated clockwise from the state of the bending apparatus 1 shown in FIG. 4A, the main bending tool holder 30 and the preliminary bending tool holder 50 are further moved as shown in FIG. 5A. Descend. As a result, as shown in FIG. 5B, the flange portion OP1 of the outer panel OP is pushed obliquely downward by the blade surface 53 of the preliminary bending tool 51, so that the flange portion OP1 is bent forward. At this time, the flange portion OP1 is bent at an angle of 45 degrees along the inclination of the blade surface 53 of the preliminary bending tool 51.

  As shown in FIG. 5A, when the lower link member 42 and the connecting link member 71 constituting the toggle link are most opened, the preliminary bending tool holder 50 is located at the foremost position, and the flange portion The pre-bending of OP1 is completed.

(Bending stage)
When the output shaft 21 rotates clockwise from the state of the bending apparatus 1 shown in FIG. 5A, the second link member 82 rotates clockwise as shown in FIG. The tip of the two link member 82 is further raised.

As a result, as in the preliminary bending stage, the first link member 81 rises, and the upper link member 41 tilts with the rear end portion raised and the front end portion lowered with the pin 41b as the center of rotation.
Further, the main bending tool holder 30 connected to the front end portion of the upper link member 41 is guided and lowered by the first link mechanism 40, and as shown in FIG. 6B, the flange portion of the outer panel OP. It contacts OP1 from above.

Further, as shown in FIG. 6A, the lower link member 42 connected to the bending tool holder 30 rotates clockwise around the pin 42b, thereby lower link member. As for the connection link member 71 by which the rear-end part is connected with the corner | angular part of the upper rear side of 42, the rear-end part falls diagonally toward back, and a front-end part rises diagonally toward back.
As a result, the preliminary bending holder 50 connected to the front end portion of the connecting link member 71 rises obliquely toward the rear, and the preliminary bending tool 51 is retracted from the outer panel OP as shown in FIG. 6B. .

  Further, when the output shaft 21 rotates clockwise from the state of the bending apparatus 1 shown in FIG. 6A, the bending tool holder 30 is further lowered as shown in FIG. 7A. As a result, as shown in FIG. 7B, the flange surface OP1 of the outer panel OP is pushed downward and folded by the blade surface 33 of the final bending tool 31. In this state, the drive of the servo motor 22 is stopped.

  In this way, the flange part OP1 of the outer panel OP is finally bent, and the edge part of the outer panel OP is hemmed so that the edge part of the outer panel OP sandwiches the edge part of the inner panel IP. Thus, the edges of the outer panel OP and the inner panel IP are joined.

  After the main bending step is completed, the output shaft 21 shown in FIG. 7A is rotated in the reverse direction (counterclockwise), thereby performing the main bending tool holder 30 and the preliminary bending tool in the same manner as in the panel setting step. The holder 50 is retracted from the work table D (see FIG. 7B), the processed outer panel OP and inner panel IP are removed from the work table D, and the outer panel OP and inner panel IP to be processed are removed from the work table. Install on D.

[Function and effect of bending machine]
In the bending apparatus 1 of the present embodiment, as shown in FIG. 4 (b), the blade surface 53 of the preliminary bending tool 51 abuts against the flange portion OP1 of the outer panel OP obliquely from above, so that the spare portion of the flange portion OP1 is spared. When the pre-bending tool 51 starts to contact the flange portion OP1, the pressing force from the pre-bending tool 51 is dispersed in the horizontal and vertical components, and the bending force is applied to the flange portion OP1. Since the pressing force from the horizontal direction is reduced, a constant pressing force acts on the flange portion OP1 from an obliquely upward direction during preliminary bending.
Accordingly, it is possible to prevent the outer panel OP from being displaced during the pre-bending, and the outer panel OP and the inner panel IP from being distorted, so that the processing accuracy of the hemming process can be improved and the quality of the product can be improved. It can be increased uniformly.

  Further, as shown in FIG. 4A, the primary bending tool holder 30 and the preliminary bending holder 50 are attached to the outer panel OP (FIG. 4) using the first link mechanism 40 and the second link mechanism 60 which are parallel links. Since the mechanism for moving the main bending tool holder 30 and the preliminary bending tool holder 50 has a simple configuration, the manufacturing cost of the bending apparatus 1 can be reduced. In addition, the entire apparatus can be made compact.

In addition, an electric servo motor 22 is used for the driving device 20, and the rotational torque and the rotation amount of the output shaft 21 can be easily controlled. Thereby, the moving amount of the main bending tool holder 30 can be easily controlled, and the pressing force when the main bending tool 31 bends the flange portion OP1 (see FIG. 4B) can be finely adjusted. , Hemming can be finished with high accuracy.
Further, by using the electric servo motor 22 for the driving device 20, it is not necessary to attach a driving source such as a hydraulic unit to the bending device 1, so that the bending device 1 can be made compact.

[Other Embodiments]
The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the spirit of the present invention.
For example, in this embodiment, as shown in FIG. 7A, in the second link mechanism 60, a line segment X1 connecting two fulcrums on the preliminary bending tool holder 50 side and two fulcrums on the support base 10 side are provided. The connected line segment X2 is inclined in parallel at an angle of 45 degrees obliquely downward toward the front, corresponding to the angle of the blade surface 53 of the preliminary bending tool 51, but the angle is limited. It is desirable not to be inclined but to be inclined at an angle of about 45 to 60 degrees.

Moreover, in this embodiment, although the blade surface 33 of this bending tool 31 is made into the horizontal surface, the angle of this blade surface 33 is not limited and respond | corresponds to the shape etc. of a workpiece | work (flange part of an outer panel). It is set appropriately.
In the present embodiment, the blade surface 53 of the preliminary bending tool 51 is an inclined surface inclined at an angle of 45 degrees obliquely downward toward the front, but the angle of the blade surface 53 is not limited. It is set appropriately according to the installation angle of the workpiece.

Further, a pressure sensor is attached to the flange portion OP1 of the outer panel OP shown in FIG. 7B, and when the flange portion OP1 is bent, the pressing force acting on the flange portion OP1 is measured, and the pressing force is measured. Can be configured such that the control unit feedback-controls the rotational torque and the rotational amount of the output shaft 21 of the servo motor 22 (see FIG. 7A) so that the pressing force is suitable for hemming.
In this configuration, even when the pressing force acting on the flange portion OP1 is reduced due to wear of the blade surface 33 of the final bending tool 31, the lowering amount of the final bending tool 31 is adjusted in accordance with the decrease amount. Since hemming can always be performed with a constant pressing force, the quality of the product can be improved uniformly.

  In the present embodiment, the electric servo motor 22 is used as the drive source of the drive device 20, but the drive source and the configuration of the drive device 20 are not limited, and various known configurations such as a hydraulic cylinder can be used. It can also be used.

  In the present embodiment, the main bending tool holder 30 and the pre-bending tool holder 50 are moved by using parallel links. However, after the pre-bending tool 51 comes into contact with the work (outer panel) obliquely from above. As long as the bending tool 31 can be brought into contact with the workpiece from above, the link mechanism is not limited.

It is the whole perspective view showing the bending device of this embodiment. It is the figure which looked at the bending apparatus of this embodiment from the front. It is the figure which showed the bending apparatus of this embodiment, (a) is the side view of a panel installation step, (b) is the enlarged view which showed the processing state of the flange part. It is the figure which showed the bending apparatus of this embodiment, (a) is a side view of the state which the preliminary | backup bending tool contact | abutted to the flange part in the preliminary | backup bending stage, (b) is the enlarged view which showed the processing state. It is the figure which showed the bending apparatus of this embodiment, (a) is a side view of the state which completed the preliminary bending in the preliminary bending stage, (b) is the enlarged view which showed the processing state. It is the figure which showed the bending apparatus of this embodiment, (a) is a side view of the state which this bending tool contact | abutted to the flange part in the final bending stage, (b) is the enlarged view which showed the processing state. It is the figure which showed the bending apparatus of this embodiment, (a) is a side view of the state which the main bending was completed in the final bending stage, (b) is the enlarged view which showed the processing state. It is the side view which showed the conventional bending apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bending apparatus 10 Support stand 20 Drive apparatus 21 Output shaft 22 Servo motor 30 Main bending tool holder 31 Main bending tool 33 Blade surface 40 First link mechanism 41 Upper link member 42 Lower link member 50 Preliminary bending tool holder 51 Preliminary Bending tool 53 Blade surface 60 Second link mechanism 61 Front link member 62 Rear link member 70 Third link mechanism 71 Connection link member 80 Fourth link mechanism 81 First link member 82 Second link member D Worktable IP Inner panel OP Outer panel OP1 Flange

Claims (3)

A bending apparatus for hemming the edge of a plate-shaped workpiece,
A support base;
A driving device provided on the support;
A main bending tool holder to which the main bending tool is attached;
A first link mechanism for connecting the main bending tool holder and the support base;
A pre-bending tool holder with a pre-bending tool attached;
A second link mechanism connecting the preliminary bending tool holder and the support base;
A third link mechanism for connecting the main bending tool holder and the preliminary bending tool holder;
The preliminary bending tool holder is guided by the first link mechanism by the driving force of the driving device and moves downward toward the work, and in conjunction with the main bending tool holder, the preliminary bending tool When the holder is guided by the second link mechanism and moves obliquely downward toward the workpiece,
After the pre-bending tool abuts on the flange portion raised at the edge of the workpiece obliquely from above and bends the flange portion, the main bending tool abuts on the flange portion from above, and the flange The bending apparatus is configured to bend the portion. The first link mechanism is a parallel link, and line segments respectively connecting the two fulcrums on the main bending tool holder side and the support base side are extended in the vertical direction,
The second link mechanism is a parallel link, and a line segment connecting the two fulcrum points on the preliminary bending holder side and the support base side is extended obliquely downward toward the workpiece side. The bending apparatus according to claim 1, wherein The driving device is an electric motor;
A fourth link mechanism for connecting the output shaft of the drive device and the first link mechanism is provided;
The driving force of the driving device is transmitted to the first link mechanism via the fourth link mechanism, so that the first link mechanism moves the main bending tool holder. The bending apparatus according to claim 1 or 2, wherein the bending apparatus is provided.

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