JP4147746B2 - Press brake - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a press brake, and more particularly to an improvement in plate material discharge after bending.
[0002]
[Prior art]
In the press brake, the plate material positioned between the upper die and the lower die is bent by causing the upper die tip portion to enter the concave portion of the lower die by lowering the upper die. In such a press brake, each part of the plate material may be bent sequentially, and finally the plate material may be bent into a square pipe shape. Thus, the plate material bent into the shape of a square pipe has a shape that sandwiches the upper mold from both sides when the bending process is completed. The square pipe-shaped plate material is discharged from the press brake by being pulled out along the bending line direction of the upper die.
[0003]
[Problems to be solved by the invention]
However, the plate material bent into the shape of a square pipe is strongly pressed against both surfaces of the upper die so as to sandwich the upper die. For this reason, when a board | plate material is pulled out along the bending line direction of an upper mold | type, extraction cannot be performed smoothly and the surface of an upper mold | type may be damaged.
[0004]
The object of the present invention is to eliminate such problems and to easily pull out the plate material even when the plate material is in strong contact with the surface of the upper mold when the plate material bent into a square pipe shape is pulled out in the direction of the plate material bending line. It is possible to provide a press brake that can prevent the upper mold from being damaged.
[0005]
[Means for Solving the Problems]
The press brake according to the present invention includes a lower mold having a molding recess, and an upper mold having a tip portion that enters the recess with respect to the lower mold, and is a plate material positioned between the upper mold and the lower mold. The tip portion is bent by entering the recess, and is exposed above the tip portion of the upper mold, exposed on the surface of the upper mold, and is slidably contacted with the upper mold of the plate material. A friction reducing member for reducing friction is provided.
According to this configuration, when the plate material bent into the shape of a square pipe is pulled out in the plate material bending line direction, the plate material comes into contact with the friction reducing member even if the plate material contacts the surface of the upper mold. Therefore, the plate material can be easily pulled out, and the upper mold is prevented from being damaged.
The friction reducing member may be a roller device that can roll in a direction parallel to the plate bending direction. In the case of this configuration, since the plate material contacts the rolling roller device, the plate material can be smoothly pulled out from the upper mold with a smaller pulling force.
[0006]
The upper die for pressing according to the present invention has a tip portion that enters a lower die having a molding recess, and is exposed on the surface of the upper die above the tip portion so as to cause friction against sliding contact of the plate material. A friction reducing member for reducing is provided. The friction reducing member is, for example, a roller device that is exposed on the surface of the upper mold and can roll in a direction parallel to the plate bending direction.
According to this configuration, when used in a press brake, when the plate material bent into a square pipe shape is pulled out in the plate material bending line direction, the plate material can be easily pulled out even if the plate material touches the surface of the upper mold. It is also possible to prevent the mold from being damaged.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of the press brake, and FIG. 2 is a side view thereof. In this press brake, a female lower die 2 having a molding recess 12 (FIG. 3) is mounted on a bed 1, and a tip portion of the lower ram 3 that enters the recess 12 with respect to the lower die 2 A male upper mold 4 having 14 (FIG. 3) is attached. The ram 3 is installed on the bed 1 so as to be movable up and down by guides 5 on both sides, and is driven up and down by a ram lifting and lowering driving device 6.
The lower mold 2 and the upper mold 4 are each divided into a plurality of divided molds 2a and 4a in the mold width direction, and the mold width can be changed by selecting the number of arrangement of the divided molds 2a and 4a. This mold width change is performed by moving the split molds 2a and 4a between a use position (shown position) used for processing and a retracted position by a split mold selection mechanism (not shown).
[0008]
The bed 1 is provided with a plate support 7 and a gauge 8 before and after the lower mold 2. The plate material W to be bent is inserted on the lower die 2 until it is placed on the plate material support 7 and hits the gauge 8, and the upper die 4 is lowered by the ram 3 so that the lower die 2 of the female type and the upper die of the male type are inserted. 4, the plate material W is bent into a V shape or the like.
[0009]
A plurality of types of lower molds 2 are installed at the front and rear according to the bending shape of the plate material W, and a desired lower mold 2 is moved to a use position by a lower mold selection mechanism (not shown). A plurality of types of upper molds 4 corresponding to the types of the lower molds 2 can be switched and installed on the ram 3 by an upper mold selection mechanism (not shown).
[0010]
As shown in a side view and a front view in FIGS. 3 and 4, the upper die 4 is exposed on the surface of the upper die 4 and is slid with the upper die 4 of the plate W. A roller device 9 that is a friction reducing member that reduces friction against contact is provided for each of the split molds 4a. This roller device 9 is composed of a pair of rollers 10 and 10 exposed on the front and back of the upper mold 4 and is capable of rolling in a direction parallel to the plate material bending line direction X (FIG. 1). Further, the pair of rollers 10 and 10 of the roller device 9 includes a pair of left and right support members 11 and 11 having two roller holding grooves 11a inside the upper die 4 as shown in a horizontal sectional view in FIG. It is supported so as to be in contact with each other with a gap therebetween. Further, the roller device 9 is arranged so as to be divided into upper and lower parts between the adjacent divided dies 4a and 4a. That is, when the roller device 9 is disposed at the upper position in one of the divided molds 4a, the roller device 9 is disposed at the lower position in the adjacent divided mold 4a. Along each X, the roller devices 9 are arranged in a staggered pattern in the vertical direction. Further, the roller 10 of the upper roller device 9 and the roller 10 of the lower roller device 9 are in a positional relationship in which a part thereof overlaps in the vertical direction.
[0011]
For example, as shown in FIGS. 6A to 6C, when the plate material W is processed into a square pipe shape by the press brake having the above-described configuration, the processed plate material W is bent from the upper die 4 to the plate material. It is pulled out in the line direction X. In this drawing operation, as shown by the phantom line in FIG. 3, the end a of the plate material W processed into a cylindrical shape may be pressed against the surface of the upper mold 4. However, the end portion a comes into contact with the roller 10 of the roller device 9 and does not directly contact the surface of the upper mold 4. As a result, the work of extracting the plate material W from the upper die 4 can be easily performed by the rotation of the roller 10 without damaging the surface of the upper die 4 at the end a of the plate material W.
[0012]
Further, since the roller device 9 includes the pair of rollers 10 and 10 exposed on the front and back of the upper mold 4, the drawing work of the plate material W can be performed more smoothly. Further, the pair of rollers 10 and 10 are installed so as to be in contact with each other inside the upper mold 4, and when one roller 10 rotates by sliding contact of the plate material W when the plate material W is pulled out, the rotation is the other roller. 10 is transmitted as rotation on the plate material drawing side. Therefore, when the pulling resistance is large on one of the surfaces, the pulling force with the larger resistance can be obtained with the other pulling force, and the plate member W can be pulled out more easily with the small pulling force. In addition, since the roller device 9 is arranged in the upper position and the lower position between the adjacent divided molds 4a and 4a of the upper mold 4, the rigidity of the upper mold 4 is averaged over the entire area and made as small as possible. The plate material W can be smoothly pulled out regardless of the position in the vertical direction where the end portion a of the plate material W that may be slidably contacted with the upper mold 4 is located. In particular, the roller 10 of the upper roller device 9 and the roller 10 of the lower roller device 9 are in a positional relationship that partly overlaps in the vertical direction. The drawing of the plate material W is not hindered, and the plate material W can be drawn smoothly.
[0013]
In this embodiment, the roller device 9 is provided as a friction reducing member for reducing friction against the sliding contact between the plate material W pulled out from the upper die 4 and the upper die 4. However, the present invention is not limited to this, and the plate material W is pulled out with good slippage. Other members may be used as long as they can be used.
[0014]
【The invention's effect】
The press brake according to the present invention includes a lower mold having a molding recess, and an upper mold having a tip portion that enters the recess with respect to the lower mold, and is a plate material positioned between the upper mold and the lower mold. The tip portion is bent by entering the recess, and is exposed above the tip portion of the upper mold, exposed on the surface of the upper mold, and is slidably contacted with the upper mold of the plate material. Since a friction reducing member that reduces friction is provided, when a plate bent into a square pipe shape is pulled out in the direction of the plate bending line, the plate can be easily pulled out even if the plate contacts the surface of the upper mold. Scratches are also prevented.
When the friction reducing member is a roller device that can roll in a direction parallel to the plate material bending line direction, the plate material can be smoothly extracted from the upper mold with a smaller pulling force.
The upper mold for press brake according to the present invention has a tip portion that enters a lower die having a molding recess, and is exposed on the surface of the upper die above the tip portion to cause friction against sliding contact of the plate material. By using a press brake, the plate material can be easily removed even when the plate material comes into contact with the upper mold surface when the square pipe-shaped bent plate material is pulled out in the direction of the plate material bending line. It is possible to prevent the upper mold from being damaged.
[Brief description of the drawings]
FIG. 1 is a front view of a press brake according to an embodiment of the present invention.
FIG. 2 is a side view of the press brake.
FIG. 3 is a side view of an upper mold in the press brake.
FIG. 4 is a partial front view of the same mold.
FIG. 5 is a partial horizontal sectional view of the same mold.
FIG. 6 is an explanatory view showing an example of plate bending by the press brake.
[Explanation of symbols]
2 ... Lower mold 4 ... Upper mold 9 ... Roller device (friction reducing member)
X ... Plate material bending line direction W ... Plate material a ... Plate material edge

Claims (3)

A lower mold having a molding recess, and an upper mold having a tip portion that enters the recess with respect to the lower mold, and a plate material positioned between the upper mold and the lower mold, the tip portion being the In a press brake that bends by entering into a recess, a friction reducing member that is exposed on the surface of the upper mold above the tip portion of the upper mold and reduces friction of the plate material against sliding contact with the upper mold is provided. A press brake characterized by being provided. The press brake according to claim 1, wherein the friction reducing member is a roller device that can roll in a direction parallel to a plate material bending line direction. An upper die used for a press brake, which has a tip portion entering a lower die having a molding recess, and is exposed on the surface of the upper die above the tip portion and against the sliding contact of the plate material. Upper die for press brakes equipped with a friction reducing member that reduces friction.

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