JP2010184275A - Apparatus and method for bending work - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for bending work which performs bending work by moving a pressing part around the edge of work W, and a method therefor. <P>SOLUTION: The bending apparatus 10 comprises a bending mechanism 20 including the pressing part 40 to apply bending force on the edge part of the work W and a fulcrum part 42 connected with the pressing part 40, a work table 24 (a work holding means) arranged between the pressing part 40 and the fulcrum part 42, and a robot 22 to movably hold the bending mechanism 20. On one side of faces of the work table 24, the work W is loaded and positioned while on the other side a fulcrum receiving part 28 is provided to receive the fulcrum part 42. The robot 22 performs bending work on the edge of the work W by moving around the pressing part 40 using a contact point between the fulcrum part 42 and the fulcrum receiving part 28 as a fulcrum. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

  For example, bonnets, trunks, doors, and the like of automobiles are subjected to hemming that bends the edge portions of the panels constituting them inward of the panels. In this hemming process, a hemming device described in Patent Document 1, that is, a hemming in which a panel is positioned and held on a fixed mold and bent while pressing a pressing portion against a flange of the panel edge portion. A device or the like is used.

Japanese Patent Laid-Open No. 7-88567

  However, the hemming device of Patent Document 1 has a fixed type and a movable type, and employs a configuration in which the movable type is pressed against the movable type via a push rod under the driving action of the ram, and the device is expensive. In addition, it is not suitable for a small space site such as an automobile production line, and it is difficult to further downsize and simplify the hemming device. In addition, the hemming device requires a plurality of driving devices such as a driving source for displacing the push rod and a driving source for rotating the movable die, and the configuration itself is complicated, and matching of both driving sources is required. Must have some kind of control.

  The present invention was made to solve the above-described problems, and when performing bending on the edge of the workpiece, hemming processing can be performed easily and quickly with a jig provided at the tip of the robot, Moreover, it is an object of the present invention to provide a bending apparatus and a bending method that can achieve miniaturization and simplification.

The invention specified in claim 1 of the present application is a bending mechanism including a pressurizing unit that performs bending on an edge of a workpiece, and a fulcrum unit connected to the pressurizing unit,
A workpiece support means provided with a workpiece receiving portion on which the workpiece is placed and positioned; and a fulcrum receiving portion with which the fulcrum portion engages;
Drive means for movably supporting the bending mechanism;
Have
The drive means engages the fulcrum part with the fulcrum receiving part, and turns the pressurizing part around the fulcrum part to bend the edge of the workpiece with the pressurizing part. It is characterized by that.

  According to the invention specified in the first aspect, the pressurizing part as the center of rotation is rotated around the fulcrum part, and the pressurization of the pressurizing part bends the edge of the workpiece. . Bending can be performed reliably in a short time with an extremely simple configuration.

The invention specified in claim 2 of the present application is the bending apparatus according to claim 1,
The fulcrum portion has an arcuate top surface, the fulcrum receiving portion is an arcuate recess that receives the top surface of the fulcrum portion, and the radius of the recess of the fulcrum receiving portion is the radius of the top surface of the fulcrum portion. It is characterized by being larger.

  According to the invention specified in the second aspect, since the radius of the arc-shaped concave portion of the fulcrum receiving portion is larger than the radius of the top surface of the fulcrum portion, the bending process can be easily performed without mutual contact. Done.

The invention specified in claim 3 of the present application is a bending method in which bending is performed by a pressurizing portion constituting a bending mechanism with respect to the edge of the workpiece supported by the workpiece support means.
Engaging a fulcrum part connected to the pressurizing part with a fulcrum receiving part provided in the work support means;
Bending the edge of the workpiece by rotating and pressing the pressing portion toward the edge of the workpiece with the fulcrum as a fulcrum; and
Separating the fulcrum part from the fulcrum receiving part;
It is characterized by having.

  The invention specified in the third aspect can achieve the same effect as the first aspect.

  According to the present invention, the bending apparatus having the bending mechanism provided with the pressurizing portion that rotates when the bending mechanism is approached to the workpiece, bent with respect to the workpiece, and separated from the workpiece is used. . Therefore, the bending apparatus can be further downsized and simplified.

  Further, according to the present invention, while the fulcrum portion provided in the bending mechanism is engaged with the fulcrum receiving portion, the pressurizing portion is brought into contact with the edge portion of the workpiece, and the bending operation on the edge portion of the workpiece is performed. By doing so, a large bending force can be generated with a small driving force.

It is a schematic perspective explanatory view of a bending apparatus according to an embodiment of the present invention. It is a schematic side view which shows the relationship between the bending mechanism provided in the front-end | tip of the robot in the bending apparatus shown in FIG. 1, and a workpiece | work. FIG. 3 is a perspective view of the bending mechanism shown in FIG. 2. It is explanatory drawing which shows the state which the fulcrum part of the bending process mechanism shown in FIG. 2 engages with the fulcrum receiving part by the side of a workpiece | work. It is a partially expanded explanatory view of the state in which the fulcrum part of the bending mechanism shown in FIG. 4 engages with the fulcrum receiving part on the workpiece side. It is explanatory drawing which shows the state which is bending the workpiece | work by the bending mechanism shown in FIG. It is a flowchart which shows the process sequence which bends a workpiece | work using the bending apparatus which concerns on this Embodiment.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a bending apparatus according to the present invention will be described in detail with reference to the accompanying drawings by giving preferred embodiments in relation to the bending method.

  FIG. 1 is a diagram for explaining a state in which bending processing is performed on an edge portion of a work W composed of an outer panel 12 and an inner panel 14 constituting an automobile bonnet by a bending apparatus 10 as an embodiment of the present invention. It is a perspective view. The bending apparatus 10 according to the present embodiment bends the edge portion of the workpiece W by bending the flange portion 16 having a shape standing substantially perpendicular to the edge portion of the outer panel 12 of the workpiece W toward the inner side of the outer panel 12. I do.

  As shown in FIG. 1, the bending apparatus 10 includes a processing table 18 on which a workpiece W is placed, and a robot 22 that holds a bending mechanism 20 at the tip. The workpiece W is positioned and held on a machining table (work support means) 24 placed on the machining table 18. The workpiece W is carried into and out of the processing table 24 by a workpiece automatic conveying means (not shown).

  The robot 22 is an industrial articulated robot, and can move the bending mechanism 20 to an arbitrary position and an arbitrary posture by a program operation. The robot 22 can perform teaching while actually performing an operation by operating a teaching pendant (not shown). Furthermore, teaching can be performed without operating the actual robot 22 by offline processing using a three-dimensional CAD (Computer Aided Design) or the like. Such a robot 22 operates under the control of a controller 26 which is a control device.

  In the processing table 24, the workpiece W is placed on the upper surface (work receiving portion), and on the lower surface, as shown in FIG. 2, a fulcrum receiving portion 28 is formed as a concave portion having a curved cross section. The fulcrum receiving part 28 is engaged with a fulcrum part 42 described later, and a contact point between the fulcrum receiving part 28 and the fulcrum part 42 functions as a rotation fulcrum. Actually, as shown in FIG. 1, the fulcrum receiving portion 28 extends along the end of the processing table 24 in the direction of the one-dot chain line. The fulcrum receiving portion 28 may be provided on the upper surface of the processing table 24 on which the workpiece W is placed, or may be provided on the side surface thereof.

  As shown in FIGS. 2 and 3, the bending mechanism 20 is attached to the lower end surface of a bending bracket 32 fixed to the arm tip of the robot 22. The bending mechanism 20 has a base portion 34 fixed to the bracket 32 and a support portion 36 fixed to the base portion 34, and the base portion 34 is fixed to the horizontal surface of the bracket 32 by bolts 38 a to 38 d. Is done.

  In the side view shown in FIG. 2, the support portion 36 has a substantially U-shape whose upper portion is longer than the lower portion, and the support portion 36 pressurizes the flange portion 16 of the workpiece W by bending. And a fulcrum portion 42 that engages with a fulcrum receiving portion 28 provided on the back surface of the processing table 24. The connecting portion 44 that integrally connects the pressurizing portion 40 side and the fulcrum portion 42 side is fixed to the base portion 34 by bolts 46a to 46d.

  The pressurizing unit 40 is fixed to a first attachment unit 48 provided at the top end of the support unit 36. In addition, you may provide the groove part engaged with the flange part 16 of the workpiece | work W in the lower end surface 40a of the pressurizing part 40 press-contacted with the said flange part 16, as shown with a broken line.

  On the other hand, the fulcrum part 42 is integrated with the arcuate convex part 50 engaged with the fulcrum receiving part 28 provided on the processing table 24, and the convex part 50, and a base for positioning and fixing the convex part 50. 54. The convex portion 50 has an arc surface orthogonal to the extending direction at a substantially central portion of the bulging portion 55 rising from the base 54. As shown in FIG. 4, the curved top portion of the convex portion 50 can contact the top surface of the fulcrum receiving portion 28 formed of a concave portion having a curved cross section. In this case, as shown in FIG. 5, the radius r1 of the convex portion 50 is smaller than the radius r2 of the fulcrum receiving portion 28 (r1 <r2). Therefore, the top portion of the convex portion 50 is in contact with the top surface of the fulcrum receiving portion 28, and gaps S1 and S2 are formed between both sides of the top portion of the convex portion 50 and the fulcrum receiving portion 28. . The widths of the gaps S1 and S2 relatively change in the region of the fulcrum receiving portion 28 according to the degree to which the fulcrum portion 42 swings. With such a shape, when the edge portion of the workpiece W is bent, the convex portion 50 is engaged with the fulcrum receiving portion 28 with the contact point between the top portion of the convex portion 50 and the top surface of the fulcrum receiving portion 28 as a fulcrum. It can be easily rotated. Although not shown, the fulcrum part 42 may be provided with a position adjusting mechanism so that the convex part 50 can be displaced along the bulging part 55. This is because the fulcrum part 42 is displaced toward the fulcrum receiving part 28 to adjust the position.

  On the other hand, the pressure part 40 is made of a thick flat plate-like metal plate and is fixed to the support part 36 so as to face the fulcrum part 42. That is, the pressurizing portion 40 is fixed to the first mounting portion 48 by bolts 56a and 56b, and the fulcrum portion 42 is fixed to the second mounting portion 52 by bolts 58a and 58b. The front end of the pressing part 40 extends to a position closer to the flange part 16 of the workpiece W than the fulcrum part 42.

  The bending mechanism 20 of the bending apparatus 10 in the present embodiment is configured as described above. Next, the bending apparatus 10 is used to form the workpiece W including the corner portion Cn shown in FIG. The bending process of the flange portion 16 will be described below with reference to the drawings. 4 and 6, arrows A1 and A2 indicate the rotation direction of the bending mechanism 20.

  First, the workpiece W is placed on the processing table 24 fixed on the processing table 18 (step S1 in FIG. 7, the same applies hereinafter). At that time, the workpiece W is arranged in a state where the corner portion Cn is made to correspond to the fulcrum receiving portion 28 provided on the processing table 24.

  Next, the robot 22 is operated under the control of the controller 26 shown in FIG. 2, and the fulcrum portion 42 fixed to the bending mechanism 20 from the state separated from the workpiece W (hereinafter referred to as a standby state) is changed to the corner portion of the workpiece W. Engage with the fulcrum receiving portion 28 corresponding to Cn (step S2). As shown in FIG. 4, the top portion of the fulcrum portion 42 contacts the curved top surface of the fulcrum receiving portion 28 by this operation. Hereinafter, this state is defined as an initial state.

  Next, from the initial state, as shown in FIG. 6, the bending mechanism 20 is configured so that the pressurizing unit 40 works with the contact point between the top of the fulcrum part 42 and the curved top surface of the fulcrum receiving part 28 as a fulcrum. After rotating in the direction approaching the flange portion 16 of W, that is, in the direction of the arrow A1, the pressurizing portion 40 is brought into pressure contact with the flange of the workpiece W, and then is swung toward the flange portion 16 side of the workpiece W. In this case, the radius r1 of the convex portion 50 provided on the fulcrum portion 42 is smaller than the radius r2 of the fulcrum receiving portion 28, and the convex portion 50 is smoothly bent in the direction of the arrow A1 without being engaged with the fulcrum receiving portion 28. The mechanism 20 can be rotated. As a result, the flange portion 16 of the workpiece W is bent toward the inner panel 14 and integrated with the outer panel 12.

  After execution of the bending process, the bending mechanism 20 is moved by bending the pressurizing unit 40 with the contact point between the top of the fulcrum part 42 and the curved top surface of the fulcrum receiving part 28 as a fulcrum. Is rotated in the direction away from the flange portion 16, that is, in the direction of arrow A2, to return to the initial posture (step S4).

  Thereafter, the fulcrum part 42 is separated from the fulcrum receiving part 28, and the bending mechanism 20 is moved to the standby state position (step S5).

  Next, the arm of the robot 22 is moved along the alternate long and short dash line in FIG. 1, and the next bending process is performed.

  In the above-described embodiment, the case where the bending apparatus 10 performs bending around the corner portion Cn of the workpiece W has been described as an example. However, according to the bending apparatus 10, the corner portion Cn as described above is used. It can be used suitably also for the edge part of the workpiece | work W other than.

  According to the present embodiment, the bending apparatus 10 causes the bending mechanism 20 to approach the edge of the workpiece W, performs bending on the edge of the workpiece W by the pressure unit 40, and then performs the bending. Since a series of bending operations for separating the processing mechanism 20 from the edge of the workpiece W can be performed by the robot, there is no need to provide a plurality of drive sources separately for each bending operation, and the bending apparatus 10 is more capable. The size is further reduced, and the configuration is simplified.

  Further, the bending apparatus 10 is arranged so as to be the pressurizing unit 40, the fulcrum unit 42, and the robot 22 from a position close to the edge of the workpiece W, and between the pressurizing unit 40 and the fulcrum unit 42. The distance is set so as to be shorter than the distance between the fulcrum part 42 and the robot 22, and the bending point with respect to the edge of the workpiece W is applied by the lever principle with the contact point between the fulcrum part 42 and the fulcrum receiving part 28 as a fulcrum. Processing. As a result, by rotating the bending mechanism 20 under the driving action of the robot 22, it is possible to obtain a sufficient bending force capable of performing the bending process. In general, a large bending force is required to bend the corner portion Cn formed at an angle close to a right angle, but according to the present embodiment, a drive having a large driving force is required. A large bending force can be obtained without providing a source.

  Of course, the bending apparatus and the bending method according to the present invention are not limited to the above-described embodiments, and various configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Bending apparatus 12 ... Outer panel 14 ... Inner panel 16 ... Flange part 18 ... Processing stand 20 ... Bending mechanism 22 ... Robot 24 ... Processing table 28 ... Supporting point receiving part 32 ... Bracket 34 ... Base 36 ... Supporting part 40 ... Addition Pressure part 42 ... fulcrum part 44 ... connecting part 48 ... first attachment part 50 ... convex part 52 ... second attachment part 54 ... base

Claims (3)

A bending mechanism having a pressure part that performs bending on the edge of the workpiece, and a fulcrum part connected to the pressure part;
A workpiece support means provided with a workpiece receiving portion on which the workpiece is placed and positioned; and a fulcrum receiving portion with which the fulcrum portion engages;
Drive means for movably supporting the bending mechanism;
Have
The drive means engages the fulcrum part with the fulcrum receiving part, and turns the pressurizing part around the fulcrum part to bend the edge of the workpiece with the pressurizing part. A bending apparatus characterized by that. The bending apparatus according to claim 1,
The fulcrum portion has an arcuate top surface, the fulcrum receiving portion is an arcuate recess that receives the top surface of the fulcrum portion, and the radius of the recess of the fulcrum receiving portion is the radius of the top surface of the fulcrum portion. Bending device characterized by being larger. In the bending method in which bending is performed by the pressurizing portion constituting the bending mechanism, on the edge of the workpiece supported by the workpiece support means,
Engaging a fulcrum part connected to the pressurizing part with a fulcrum receiving part provided in the work support means;
Bending the edge of the workpiece by rotating and pressing the pressing portion toward the edge of the workpiece with the fulcrum as a fulcrum; and
Separating the fulcrum part from the fulcrum receiving part;
A bending method characterized by comprising:

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