JPH07214176A - Method for folding panel and die for press brake used to its working method - Google Patents

Abstract

PURPOSE:To prevent the buckling phenomenon of a panel by arranging a thrust member which freely penetrates a polygonal hole part on the panel at the one side of the upper and the lower metals, provides a bending die so as to be freely rotated and arranges the tip part thereof so as to be freely engaged/detached to the other die. CONSTITUTION:The lengths of the thrust member 27 and the bending die 33 are set corresponding to the side of the hole part of a work W. An upper die 3 and a lower die 7 are separated and the thrust member 27 is held to horizontal state and a back gage 9 is positioned, and the work W is laid on a first plate holder 13. The thrust member 27 is vertically positioned by working a cylinder 19 to pass through the hole part of the work W. The work W is pressed to the first plate holder 13 with a second plate holder 39 by moving a movable side table to engage the upper end of the thrust member 27 with an engaging groove 43 on the upper die. The first plate holder 13 is relatively descended to a die base 11 and a part of the work W on the bending die 33 is bent to upward and downward. When the upper part of the groove 13G of the first plate holder 13 abuts on the lower part of the bending die 33, the bending die 33 is turned to execute the over-bending.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to each side of a polygonal hole portion in a polygonal panel having a polygonal hole portion as a window portion when manufacturing a door panel having a polygonal window, for example. TECHNICAL FIELD The present invention relates to a method for bending a flange portion into a portion and a die for a press brake used in the method.

[0002]

2. Description of the Related Art Conventionally, as a method of bending a flange portion on each side portion of the polygonal hole portion in a polygonal panel having a polygonal hole portion, for example, Japanese Patent Laid-Open Publication No. Hei 3
It is also possible to use an ironing and bending machine as shown in No. 57512 (hereinafter referred to as a prior art example). In addition, the bending process using the press brake is configured to use the upper and lower molds.

[0003]

The above-mentioned prior art is an invention relating to a dedicated machine, and it is extremely difficult to apply the technology according to the prior art to a press brake.

Attaching the upper and lower molds to the press brake,
When the flange portion is bent on each side of the polygonal hole portion in the panel, the upper and lower molds used correspond to the size of the hole portion. Therefore, when the flange portion is bent on each side of the hole, the large panel is pivotally moved upward about the bent portion, and the panel and the flange portion are V-shaped.

At this time, the weight of the large panel is supported by the back of the V groove in the lower mold, but the length of the lower mold is short corresponding to the size of the hole,
The panel is apt to cause a waist bending phenomenon in the back portion, and there is a problem in this respect.

[0006]

In view of the above-mentioned problems of the prior art, the method of the present invention provides a polygonal panel having polygonal holes on each side of the polygonal holes. Using the method of bending the flange part, (a) Abutting the back gauge of the press brake on each outer edge of the panel corresponding to each edge of the polygonal hole in the panel supported horizontally on the lower die. The bending position of each side of the polygonal hole is positioned between the upper die and the lower die of the press brake, and the flange portion is vertically arranged on each side of the polygonal hole. Step of sequentially bending, (b) after performing the bending process of the flange portion on each side of the polygonal hole, each outer edge of the panel is brought into contact with the back gauge in the press brake, Press brake on the outside Positioned between the upper and lower molds that definitive, more composed bending method sequentially performs steps a bending of the flange portion on each outer side of the panel.

The press brake mold used in the above-described processing method is such that a first plate holder for horizontally supporting a panel is vertically movably mounted on a die base mounted on one of an upper table and a lower table in the press brake. And a second plate retainer that faces the first plate retainer and presses the panel against the first plate retainer is provided in the mold holder attached to the other of the lower table and the upper table,
A thrust die provided on the die base is rotated by a relative vertical movement of the first plate retainer with respect to the die base, and a bending die for vertically bending the flange portion at an appropriate position of the panel is rotated. It is freely mounted and provided, and the tip end portion of the thrust member is detachably provided on the mold holder.

Further, a die base mounted on either the upper table or the lower table of the press brake,
The first plate retainer is provided so as to be vertically movable, and
A second plate pressing member that is opposed to the plate pressing member and presses the panel against the first plate pressing member is provided in a mold holder mounted on the other of the lower table and the upper table, and is a pivot member pivotally attached to the die base. A thrust member is detachably attached to the thrust member, and the thrust member is rotated by vertical movement of the first plate retainer relative to the die base to bend the flange portion at an appropriate position of the panel. A bending die is rotatably mounted, and the tip end of the thrust member is detachably attached to the die holder.

Further, a die base mounted on either the upper table or the lower table of the press brake,
The first plate retainer is provided so as to be vertically movable, and
A second plate pressing member that presses the panel against the first plate pressing member is provided in a mold holder mounted on the other of the lower table and the upper table and pivotally mounted on both sides of the die base. The thrust member is rotated by relative vertical movement of the first plate retainer with respect to the die base to bend the flange portion on each side portion of the polygonal hole portion of the panel or each outer edge of the panel. A bending die having a C-shaped cross section to be performed is rotatably mounted, and each thrust member is rotatably provided between a vertical machining position and a rest position rotated downward, and a tip of each thrust member. And a thrust member that is detachably attached to the mold holder, and at least one thrust member is provided so as to be able to penetrate the polygonal hole.

Further, a die base mounted on one of an upper table and a lower table in the press brake is provided with a first plate retainer mounted so as to be movable up and down, and a panel is provided to face the first plate retainer with a first panel. A second plate presser that presses against the plate presser is provided on a mold holder attached to the other of the lower table or the upper table, and thrust members are detachably attached to the rotary members pivotally mounted on both sides of the die base. And a flange is provided on each side of the polygonal hole of the panel or each outer side of the panel by being rotated by relative vertical movement of the first plate retainer with respect to the die base. A bending die having a C-shaped cross-section for bending the portion is rotatably mounted and provided.
Each thrust member is rotatably provided to a vertical machining position and a rest position rotated downward, and the tip end of each thrust member is detachably attached to the mold holder and at least one thrust member is provided. The member is provided so as to be able to penetrate the polygonal hole.

[0011]

With the above construction, after the panel is brought into contact with the back gauge of the press brake and positioned between the upper and lower molds, the movable table of the press brake is moved up and down to move the first and second plate holders. The panel is fixed by, and the bending die is rotated by relative vertical movement of the first plate retainer with respect to the die base to bend the flange portion at an appropriate position of the panel.

When bending the flange portion as described above, when bending the flange portion on each side of the polygonal hole provided in the panel, the thrust member provided with the bending die is placed in the hole portion. The thrust member supported by the upper and lower molds receives the reaction force at the time of bending, because the thrust member is penetrated through and the tip of the thrust member is engaged with the mold. The bending is suppressed, and more accurate bending is performed.

Further, when the flange portion is bent on each side of the polygonal hole provided on the panel and each outer side of the panel as described above, the panel is positioned by using the back gauge of the press brake. The flange part is bent on each side of the polygonal hole, and then the flange part is bent on each outer side. The flange portion is bent on each side of the polygonal hole by contacting and positioning.For example, after bending the flange portion on each outer side, bend the flange portion on each side of the hole portion. As compared with the case where the processing is performed, more accurate bending processing can be performed.

Furthermore, since the panel is held horizontally and the flange portion is bent in the vertical direction, the waist bending phenomenon does not occur.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, an upper die 3 is detachably attached to an upper table 1 of a press brake, and a lower die 7 is attached to a lower table 5.

Of the upper and lower tables 1 and 5 of the press brake, one table is provided so as to be vertically movable, and a back gauge 9 for positioning a plate-shaped work (panel) W is movable back and forth (see FIG. 1). It is movable in the left-right direction). Since this type of press brake is well known, detailed description of the press brake is omitted.

The lower die 7 includes a die base 11 which is detachably mounted on the lower table 5. The die base 11 extends in the left-right direction (direction perpendicular to the paper surface in FIG. 1), and a groove 11G extending in the left-right direction is formed on the upper surface thereof, and a panel (workpiece) is formed in the groove 11G. A first plate retainer 13 that is supported horizontally is engaged so as to be vertically movable. The first plate retainer 13 has substantially the same length as the die base 11, and the first plate retainer 1
An elastic body 14 such as a spring or a urethane rubber that presses the first plate retainer 13 upward is elastically mounted between the groove 3 and the bottom of the groove 11G.

Rotating members 17 are pivotally attached to the front and rear surfaces of the die base 11 via pivot shafts 15 so as to be vertically rotatable. In order to rotate each rotating member 17 up and down, the rotating member 17 includes a cylinder 1 as an example of an actuator.
The tip end portion of the piston rod 21 in 9 is pivotally connected via a pin 23.

The actuator is a cylinder 1
It is also possible to use an appropriate rotary actuator without being limited to 9.

A thrust member 27 is detachably attached to each of the rotating members 17 through an appropriate fixing member 25 including a bolt and a clamp piece. The thrust member 27 has a holder block 29 extending in parallel with the first plate retainer 13 and having the same length as the thrust member 27.
Is integrally attached, and this holder block 29
Is a bending die holder 31 having the same length and a three-month cross section.
Is rotatably attached.

The bending die holder 31 is constantly urged to rotate to a predetermined position by an elastic member 35 such as a coil spring. A bending die 33 having a substantially C-shaped cross section is detachably attached to the bending die holder 31 via an appropriate attaching tool such as a bolt. The bending die 33 is made of a split die, and can be appropriately combined to correspond to the length of the bending die holder 31.

Each thrust member 27 is rotated by the action of the cylinder 19 into a vertical machining position and a horizontal rest position which is rotated downward. When the thrust member 27 is positioned at the machining position, it is a holder. The block 29 is placed on the upper surface of the die base 11, and the lower end of the bending die 33 is configured to enter into the grooves 13G formed on the front and rear surfaces of the first plate retainer 13.

The upper mold 3 is composed of a mold holder 37 detachably attached to the upper table 1 via a fixture such as a bolt or a clamp piece. Workpiece W facing the first plate holder 13
A second plate retainer 39 that presses against the first plate retainer 13 is detachably attached via a bolt or the like.

Further, thrust receiving members 41 are integrally attached to the front and rear surfaces of the die holder 37, and the tips of the thrust members 27 are provided between the thrust receiving member 41 and the die holder 37. An engagement groove 43 is formed so that the portion can be engaged and disengaged.

In the configuration as described above, FIG.
As shown in FIG. 3, by bending the side portions H1, H2, H3, H4 and the outer sides H5, H6, H7 of the polygonal hole portion H in the pre-cut workpiece W along the bending line indicated by the dotted line, , (B), the case of bending the flange portions F1 to F7 will be described.

First, the thrust members 27 and the bending dies 33 corresponding to the short sides and the long sides of the hole H of the work W are formed.
Set the length of etc. Then, as shown in FIG. 2, the upper die 3 and the lower die 7 are separated from each other and each thrust member 27 is held in a horizontal rest position (one is shown in a vertical state in FIG. 2).

Next, the back gauge 9 is positioned, the work W is placed horizontally on the first plate holder 13, and the side portion H5 of the work W is brought into contact with the back gauge 9 to position the work W. .

After that, one of the cylinders 19 is operated to pass through the hole H of the work W to set the thrust member 27 to a vertical machining position, and then the movable table is moved up and down to the second position.
The work W with the plate holder 39 of the first plate holder 13
When pressed to, the upper end of the thrust member 27 engages with the engagement groove 43 of the upper die 3 (see FIG. 1).

When the movable table is further moved up and down,
As shown in FIG. 3, the side portion H1 is bent into the flange portion F1. That is, when the first plate retainer 13 is pressed by the second plate retainer 39 and moves downward relative to the die base 11, the portion of the work W on the bending die 33 is bent upward.

After that, when the upper part of the groove 13G of the first plate holder 13 comes into contact with the lower part of the bending die 33, the bending die 33 is rotated, and as shown in FIG.
Since the overbending of 1 is performed, the spring back is suppressed, and accurate bending can be performed.

Similarly, after the bending of the side portion H1 is completed,
The side portions H2 to H7 can be bent into the flanges F2 to F7 by the same process as described above. Since the lengths of the front and rear thrust members 27 are separately set to two types, it is possible to quickly cope with two types of lengths by selectively using them.

When bending the side portions H5 to H7, the side portions H1, H2, H3, and H3 of the polygonal hole portion H are formed.
After the bending of H4 is completed, the thrust member 27 is attached / detached in correspondence with the longer side portion H7, and then the work W is positioned using the back gauge 9, and the flanges F5 to F7 are used as described above. The bending process is performed.

[0033]

As can be understood from the above description of the embodiments, according to the present invention, it is possible to bend the flange portion by the press brake without causing the waist bending phenomenon on the work (panel). Yes, each side H1, H2 of the hole H in the work W having the polygonal hole H,
During the bending of H3 and H4 and the bending of the outer periphery of the workpiece W, the back gauge 9 provided in the press brake is used for positioning, so that the positional accuracy is good.

Further, each side portion H1, H2, H3 of the hole H,
Since the outer side of the workpiece W is bent after the bending of H4, the sides H1, H2, H3, and H4 of the hole H are bent after the outer side is bent. More accurate processing can be performed as compared with the case of performing.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of a press brake mold according to the present embodiment.

FIG. 2 is an operation explanatory view of the press brake mold according to the present embodiment.

FIG. 3 is an operation explanatory view of the press brake mold according to the present embodiment.

FIG. 4 is an explanatory diagram showing an example of a work.

[Explanation of symbols]

3 Upper model 7 Lower model 9 Back gauge 11
Die base 13 First plate holder 39 Second plate holder 2
7 Thrust member 33 Bending die

Claims (5)

[Claims] 1. A method of bending a flange portion on each side portion of the polygonal hole portion in a polygonal panel having a polygonal hole portion, comprising the following steps. Panel bending method. (a) Each outer edge of the panel corresponding to each side of the polygonal hole in the panel horizontally supported on the lower die is brought into contact with the back gauge of the press brake to remove each of the polygonal holes. Positioning the bending position of the side portion between the upper die and the lower die in the press brake, the step of sequentially bending the flange portion in the vertical direction on each side portion of the polygonal hole portion,
(b) After performing the bending process of the flange portion on each side portion of the polygonal hole portion, each outer edge of the panel is brought into contact with a back gauge in a press brake, and each outer edge of the press brake is attached to the back gauge. Positioning between the upper mold and the lower mold, the step of sequentially bending the flange portion on each outer edge of the panel, 2. A first plate retainer for horizontally supporting a panel is provided on a die base attached to one of an upper table and a lower table of a press brake so as to be vertically movable, and is opposed to the first plate retainer. Then panel first
A second plate pressing member for pressing the plate pressing member is provided on a mold holder mounted on the other of the lower table and the upper table, and a thrust member provided on the die base is provided with a first plate pressing member relative to the die base. And a bending die for vertically bending the flange portion is rotatably attached to an appropriate position of the panel by a vertical movement of the panel, and the tip of the thrust member is engaged with the die holder. A press brake mold characterized by being detachable. 3. A die base mounted on one of an upper table and a lower table of a press brake, the first base being attached to the die base.
And a second plate retainer that is provided so as to be movable up and down and presses the panel against the first plate retainer in opposition to the first plate retainer on the other of the lower table or the upper table. And a rotating member pivotally attached to the die base. A thrust member is detachably attached to the die base. The thrust member is rotated by the vertical movement of the first plate retainer relative to the die base. A bending die that is moved to bend the flange portion at an appropriate position of the panel is rotatably mounted, and a tip portion of the thrust member is detachably attached to the die holder. Mold for press brake. 4. A die base mounted on one of an upper table and a lower table of a press brake, the first base being attached to the die base.
And a second plate retainer that is provided so as to be movable up and down and presses the panel against the first plate retainer in opposition to the first plate retainer on the other of the lower table or the upper table. And the thrust members pivotally mounted on both sides of the die base are rotated by the relative vertical movement of the first plate retainer with respect to the die base so that each of the polygonal hole portions of the panel is rotated. Section C in which the flange portion is bent on the side portion or each outer edge of the panel
A bending die having a shape is rotatably mounted, each thrust member is rotatably provided between a vertical machining position and a rest position rotated downward, and the tip end portion of each thrust member is A press brake mold, wherein the mold holder is detachably provided and at least one thrust member is provided so as to be able to penetrate through the polygonal hole. 5. A die base mounted on one of an upper table and a lower table of a press brake, the first base being attached to the die base.
And a second plate retainer that is provided so as to be movable up and down and presses the panel against the first plate retainer in opposition to the first plate retainer on the other of the lower table or the upper table. Provided on the die holder, and the thrust member is detachably attached to each rotating member pivotally mounted on both sides of the die base, and the thrust member is provided above and below the thrust plate relative to the die base. And a bending die having a C-shaped cross section for bending the flange portion is rotatably mounted on each side of the polygonal hole portion of the panel or each outer side of the panel. Each thrust member is rotatably provided in a vertical machining position and a rest position rotated downward, and the tip end of each thrust member is detachably attached to the mold holder and at least one thrust portion is provided. Press brake die characterized by comprising providing a pierceable the hole of the polygonal shape.