JP3563431B2 - Mold for press brake - Google Patents

Description

[0001]
[Industrial applications]
For example, when manufacturing a door panel having a polygonal window, the present invention bends a flange portion at each side of the polygonal hole in a polygonal panel having a polygonal hole as a window. press brake mold to be used to how to on.
[0002]
[Prior art]
Conventionally, as a method of bending a flange portion on each side of the polygonal hole in a polygonal panel having a polygonal hole, for example, Japanese Patent Application Laid-Open No. 3-57512 (hereinafter referred to as a prior art) It is also possible to use an ironing bending machine as shown in FIG. In addition, the bending process using the press brake is configured to use upper and lower dies.
[0003]
[Problems to be solved by the invention]
The preceding example is an invention relating to a dedicated machine, and it is extremely difficult to apply the technology according to the preceding example to a press brake.
[0004]
When mounting the upper and lower molds on the press brake and bending the flange on each side of the polygonal hole in the panel, the upper and lower molds used correspond to the size of the hole Things. Therefore, when the flange is bent at each side of the hole, the large panel is pivoted upward about the bent portion, and the panel and the flange have a V-shape.
[0005]
At this time, the weight of the large panel is supported by the back of the V-groove in the lower mold. However, since the length of the lower mold is short corresponding to the size of the hole, the panel is mounted on the back. Is liable to cause a waist break phenomenon at the portion, and there is a problem in this point.
[0009]
[Means for Solving the Problems]
In view of the above-described conventional problems, the present invention provides a die base mounted on one of an upper table and a lower table in a press brake, in which a first plate holder is mounted so as to be vertically movable, and the first plate holder is provided. A second plate retainer for pressing the panel against the first plate retainer opposing the retainer is provided on a mold holder mounted on the other of the lower table or the upper table, and each thrust member pivotally attached to both sides of the die base; A cross section which is turned by a relative vertical movement of the first plate retainer with respect to the die base to bend a flange portion on each side of the polygonal hole of the panel or on each outer side of the panel. A C-shaped bending die is provided rotatably mounted, and each of the thrust members is rotatably provided between a vertical processing position and a rest position rotated downward, and each thrust member is provided. At least one of the thrust member Ri name provided to allow through the hole of the polygonal shape, each of said thrust member, the short side and long side of the hole with the tip provided so disengageably to said mold holder Is set so as to be set to a length corresponding to .
[0010]
Also, the present invention provides a die base mounted on one of an upper table and a lower table in a press brake, wherein the first plate retainer is mounted so as to be vertically movable, and the first plate retainer is opposed to the first plate retainer. A second plate retainer for pressing the plate retainer is provided on a mold holder mounted on the other of the lower table or the upper table, and a thrust member is detachably mounted on each of the rotating members pivotally mounted on both sides of the die base. The thrust member is provided with a flange on each side of the polygonal hole of the panel or on each outer side of the panel by being rotated by the relative vertical movement of the first plate holder with respect to the die base. A bending die having a C-shaped cross section for bending the part is provided rotatably, and each of the thrust members can be rotated between a vertical processing position and a rest position rotated downward. Provided, and Ri name at least one of the thrust member is provided to be capable of penetrating the hole of the polygonal with the tips of the thrust member provided so disengageably to said mold holder, each of said thrust member, said hole The length is set so as to correspond to the short side and the long side of the section .
[0012]
When bending a flange portion on the panel, in the case of bending a flange portion on each side of the hole portion of the polygonal shape at the panel, a thrust member provided with the bending tool penetrates into the bore, In addition, since the tip of the thrust member is engaged with the mold, the reaction force during bending is received by the thrust member supported by the upper and lower molds, thereby suppressing the bending of the bending mold. In addition, a more accurate bending process is performed.
[0014]
Further, since the panel is held horizontally and the flange portion is bent in the vertical direction, no waist break phenomenon occurs.
[0015]
【Example】
Referring to FIGS. 1 and 2, an upper die 3 is detachably mounted on an upper table 1 in a press brake, and a lower die 7 is mounted on a lower table 5.
[0016]
One of the upper and lower tables 1 and 5 in the press brake is provided so as to be movable up and down, and a back gauge 9 for positioning a plate-like work (panel) W is movable back and forth (in FIG. ). Since this type of press brake is well known, a detailed description of the press brake will be omitted.
[0017]
The lower die 7 includes a die base 11 detachably mounted on the lower table 5. The die base 11 extends in the left-right direction (the 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. A panel (work) is formed in the groove 11G. A first plate retainer 13 that is supported horizontally is engaged movably up and down. The first plate retainer 13 has substantially the same length as the die base 11, and the first plate retainer 13 is pressed upward between the first plate retainer 13 and the bottom of the groove 11G. An elastic body 14 such as a biasing spring or urethane rubber is elastically mounted.
[0018]
On both front and rear surfaces of the die base 11, a rotating member 17 is pivotally attached to a vertical axis via a pivot 15. In order to turn each turning member 17 up and down, the tip of a piston rod 21 of a cylinder 19 as an example of an actuator is pivotally connected to the turning member 17 via a pin 23.
[0019]
The actuator is not limited to the cylinder 19, and for example, an appropriate rotary actuator can be used.
[0020]
A thrust member 27 is detachably attached to each of the rotating members 17 via an appropriate fixing member 25 composed of a bolt and a clamp piece. A holder block 29 extending in parallel with the first plate holder 13 and having the same length as the thrust member 27 is integrally attached to the thrust member 27. The holder block 29 has the same length. A bending-type holder 31 having a three-month cross section is rotatably mounted.
[0021]
The bending type holder 31 is always 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 mounting tool such as a bolt. The bending die 33 is formed of a split die, and can correspond to the length of the bending die holder 31 by being appropriately combined.
[0022]
Each of the thrust members 27 is rotated by a function of the cylinder 19 between a vertical processing position and a horizontal rest position rotated downward. When the thrust member 27 is positioned at the processing position, the holder block 29 is It is placed on the upper surface of the die base 11, and the lower end of the bending die 33 is configured to enter the grooves 13 </ b> G formed on both front and rear surfaces of the first plate holder 13.
[0023]
The upper mold 3 is composed of a mold holder 37 detachably mounted on the upper table 1 via a fixture such as a bolt or a clamp piece. The mold holder 37 includes the first holder. A second plate retainer 39 that presses the work W against the first plate retainer 13 in opposition to the plate retainer 13 is detachably attached via a bolt or the like.
[0024]
Further, a thrust receiving member 41 is integrally attached to both front and rear surfaces of the mold holder 37, and a tip end of each of the thrust members 27 is engaged between the thrust receiving member 41 and the mold holder 37. A detachable engagement groove 43 is formed.
[0025]
In the above configuration, as shown in FIG. 4A, the sides H1, H2, H3, H4 and the outer sides H5, H6, H7 of the polygonal hole H in the pre-cut workpiece W are formed. A case will be described in which each of the flange portions F1 to F7 is bent as shown in FIG.
[0026]
First, the lengths of the thrust members 27, the bending dies 33, and the like are set corresponding to the short side and the long side of the hole H of the work W. 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).
[0027]
Next, the back gauge 9 is positioned, the work W is placed horizontally on the first plate holder 13, and the side H5 of the work W is brought into contact with the back gauge 9 to position the work W.
[0028]
Thereafter, one of the cylinders 19 is actuated to pass through the hole H of the work W to set the thrust member 27 at a vertical processing position. Then, the movable table is moved up and down to hold the work with the second plate holder 39. When W is pressed against the first plate retainer 13, the upper end of the thrust member 27 engages with the engagement groove 43 of the upper die 3 (see FIG. 1).
[0029]
When the movable table is further moved up and down, the side portion H1 is bent into the flange portion F1 as shown in FIG. That is, when the first plate retainer 13 is pressed by the second plate retainer 39 and moves relatively downward with respect to the die base 11, the portion of the work W on the bending die 33 is bent upward.
[0030]
Thereafter, when the upper portion of the groove 13G of the first plate retainer 13 contacts the lower portion of the bending die 33, the bending die 33 is rotated, and as shown in FIG. Is performed, the spring back is suppressed, and accurate bending can be performed.
[0031]
Similarly, after the bending of the side portion H1, the respective 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 the two types of lengths by selectively using them.
[0032]
When bending the sides H5 to H7, the bending of the sides H1, H2, H3, and H4 of the polygonal hole H is completed, and then the thrust member 27 is moved to the longer side H7. The work W is positioned using the back gauge 9, and the flanges F5 to F7 are bent in the same manner as described above.
[0033]
【The invention's effect】
As can be understood from the above description of the embodiment, according to the present invention, it is possible to bend the flange portion by the press brake without causing the work (panel) to break in the waist, and the polygonal shape can be obtained. At the time of bending each side H1, H2, H3, H4 of the hole H in the work W having the hole H and bending the outer side of the work W, the back gauge 9 provided for the press brake is used. Since positioning can be performed , positional accuracy is good. In addition, the length of the thrust member can be set to two types, and the two types of length can be quickly accommodated.
[Brief description of the drawings]
FIG. 1 is a 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 view showing one embodiment of a work.
[Explanation of symbols]
Reference Signs List 3 upper die 7 lower die 9 back gauge 11 die base 13 first plate holder 39 second plate holder 27 thrust member 33 bending die

Claims (2)

A first plate retainer is mounted on a die base attached to one of an upper table and a lower table in a press brake so as to be vertically movable, and a panel is pressed against the first plate retainer in opposition to the first plate retainer. A second plate retainer is provided on a mold holder mounted on the other of the lower table or the upper table, and each thrust member pivotally mounted on both sides of the die base is provided with a relative position of the first plate retainer with respect to the die base. A bending die having a C-shaped cross section for bending a flange portion is provided at each side of the polygonal hole of the panel or at each outer side of the panel so as to be rotatably mounted by vertical movement. The respective thrust members are rotatably provided between a vertical processing position and a rest position rotated downward, and a tip end of each thrust member is provided to be detachable from the mold holder. Both become provided at least one of the thrust member can pass through the hole of the polygonal shape, said that each thrust member, is provided so as to be set to a length corresponding to the short side and a long side of the hole A special feature for press brake dies. A first plate retainer is mounted on a die base attached to one of an upper table and a lower table in a press brake so as to be vertically movable, and a panel is pressed against the first plate retainer in opposition to the first plate retainer. A second plate retainer is provided on a mold holder mounted on the other of the lower table or the upper table, and a thrust member is removably mounted on each rotating member pivotally mounted on both sides of the die base. The thrust member is rotated by a relative vertical movement of the first plate retainer with respect to the die base to bend a flange portion on each side of the polygonal hole of the panel or on each outer side of the panel. A bending die having a C-shaped cross section to be performed is provided so as to be rotatable, and each of the thrust members is rotatably provided between a vertical processing position and a rest position rotated downward, and It is provided at least one of the thrust member with the distal end portion of the last member provided so disengageably to said mold holder can pass through the hole of the polygonal shape, each of said thrust member, the short side of the hole and A press-brake mold characterized by being settable to a length corresponding to the long side .

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