JPH03114614A - Bending die device for metal plate - Google Patents

Abstract

PURPOSE:To prevent extention of a metal plate due to tensile force and the generation of scratch due to a punch by approximately keeping the contact part where a moving die is brought into contact with the metal plate constant when two places of the metal plate are mutually and inversely bent by the relative movement of the moving die to the punch. CONSTITUTION:When bending of the metal plate 16 around the tip G of the punch part 14 is made to progress to some extent, one end of the metal plate 16 is brought into contact with the under surface of the punch 15. Therefore, bending around the tip F of the moving die 21 is simultaneously performed. Because the moving die 21 is moved so as to approach the punch 14 with a cam according to the progress of this bending, the metal plate 16 is pressing bent with the above-mentioned tip F without moving so much from the initial contact part H with the metal plate 16. When the ram of a press machine ts lowered to the most lowered position, because the metal plate 16 is strongly pressed between the left part of the moving die 21 and the surface of stepped part 17 for bending guide of the punch 13, the metal plate 16 is bent inversely and acutely each other at two places and is approximately formed into Z-shape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a bending die device for plate material that bends a plate material at two points in opposite directions.

(Prior Art) When forming a substantially Z-shape by bending a metal plate material at two points in opposite directions, for example, at right angles, a bending die device as shown in FIG. 6 has conventionally been used.

That is, a protrusion 2 is formed on a die 1 attached to the bed of a press machine (not shown), and a notch 4 is formed on a punch 3 attached to a ram of the press machine. Then, when the punch 3 is lowered by the ram, the plate material 5 is strongly pressed between the die 1 and the punch 3, and is bent at right angles in opposite directions at two locations.

(Problem to be Solved by the Invention) However, in the conventional bending die device, as shown in FIG. and the vertical surface 4a of the notch 4 of the punch 3, and is bent into an S-shape, and the length of the sandwiching between the vertical surfaces 2a and 4a gradually increases as the punch 3 descends, and Finally, the plate material 5 comes to be strongly pressed between the die 1 and the punch 3. However, since the gap between the vertical surface 2a of the protrusion 2 and the vertical surface 4a of the notch 4 is set to be equal to the thickness of the plate material 5, the plate material 5 inserted between the two is Before the plate material 5 is finally pressed strongly between the die 1 and the punch 3, it is stretched by the tensile force, so the length from each right-angled milled part to the tip of the image (A and B) are not clearly determined. Moreover, until the plate material 5 is finally pressed hard between the die 1 and the punch 3,
Corners of the die 1 and punch 3 that serve as the bending center of the plate material 5]
Since a and 3a move on the surface of the plate 5 as the punch 3 descends, there are problems such as scratches on the plate 5.

The present invention has been made in view of the above circumstances, and its purpose is to enable a board to be bent at two points in opposite directions without causing problems such as stretching or scratches on the board. The purpose of the present invention is to provide a bending die device for sheet materials that can be used.

[Structure of the Invention] (Means for Solving the Problems) The bending die device for plate materials of the present invention bends a plate material at two points in mutually opposite directions, and includes two holders that are moved relative to each other in the approaching and separating directions. The two holders are provided in a facing state, and one of the two holders is composed of a first punch portion with a large protrusion height toward the other holder side and a second punch portion with a small protrusion height, and both punch portions provide bending guidance. A punch having a stepped surface is provided, a pressing member is provided for holding the plate material between the first punch part so that one end side of the plate material faces the second punch part, and The holder is provided with a cam, and the second holder is in contact with a predetermined portion of the negative end side of the plate material away from the first punch portion, and as the two holders move relative to each other in the approaching direction. While approaching the punch part, the plate material is moved in a lateral direction so as to come into contact with the cam and approach the first punch part side, thereby maintaining the contact area with the plate material at the initial contact area while guiding the plate material to the bending direction. A movable die is provided that applies strong pressure to the step surface and bends the mold in opposite directions at two locations.

(Function) When both holders move relative to each other in the approaching direction, the movable die moves in the direction approaching the second punch part, and
The cam moves laterally toward the first punch section. Due to this relative movement of the movable die with respect to the punch, two parts of the plate are bent in opposite directions, but since the contact area of the movable die with the plate is approximately constant, the plate does not stretch due to the tensile force. There is no risk of scratches or scratches on the board.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In FIGS. 1 and 2, 11 and 12 are an upper die holder and a lower die holder, which are attached to the ram and bed of a press machine (not shown) to face each other. As it rises, it moves toward and away from the lower mold holder 2. Reference numeral 13 denotes a punch attached to the upper mold holder 1, which is constructed by arranging a first punch part 14 and a second punch part 15 adjacent to the upper mold holder 1, and a punch part 13 attached to the upper mold holder 1. The protrusion height toward the side is set so that the first punch portion 14 has a larger height. In this embodiment, the metal plate material 16
In order to bend the first punch part 14 into acute angles in opposite directions at two places, the right side face, which is the side face on the second punch part 15 side, is formed into an inclined surface 14a. The lower right side of the first punch section 14 has an acute angle, and the inclined surface 15a and the lower surface of the second punch section 15 form an acute bending guide step surface 17.

Reference numeral 18 denotes a cam attached to the upper die holder 11, which is disposed on the right side of the second punch 15, and has an inclined surface 18a formed on the lower left side.

On the other hand, 19 is a plate-shaped pressing member disposed on the lower mold holder 12 so as to be movable up and down. It is constantly urged upward by a compression coil spring 20. Reference numeral 21 denotes a movable die disposed on the lower die holder 12, which is disposed on the right side of the pressing member 19 and below the second punch section 15, and is moved by a slide guide 22 attached to the lower die holder 12. The holders 11 and 12 are supported so as to be movable in the horizontal direction intersecting the vertical direction, which is the relative movement direction of the holders 11 and 12, that is, in the horizontal direction. The left side of the movable die 21 is formed into an acute angle that matches the bending guide step surface 17 of the punch 13, and the right side forms an acute angle that matches the bending guide stepped surface 17 of the cam 18.
It is formed on an inclined surface 21a that coincides with a. 23 is a stopper attached to the right end of the lower mold holder 12, and the threaded rod 24 attached to the movable die 21 is attached to this stopper 2.
3 is inserted. A compression coil spring 25 is wound around the threaded rod 24, and this applies elastic force between the washer 26 attached to the tip of the threaded rod 24 and the stopper 23 to press the movable die 21. It is biased in the direction away from the member 19, that is, in the direction shown by arrow C. Therefore, the movable die 21 is always in a position where it is in contact with the stopper 23, and at this time, the acute-angled tip F at the upper left side of the movable die 21 is a predetermined distance away from the pressing member 19, and the inclined surface 21a is in contact with the cam 18.
It is directly below.

Next, the operation of the above configuration will be explained.

In the state shown in FIG. 1 in which the upper die holder 11 is raised, the plate material 16 is placed across the pressing member 19 and the movable die 21 which are flush with each other, and the ram of the press machine (not shown) is lowered.

Then, as shown in FIG.
comes into contact with the plate material 16 and pushes it down together with the pressing member 19, so that the pressing member 19 presses the compression coil spring 2
The plate material 16 is pressed against the lower surface of the first punch section 14 with an elastic force of 0, and the plate material 16 is sandwiched between the plate material 16 and the first punch section 14. In this clamped state, the acute-angled tip F of the movable die 21 projects from the first punch section 14 to the right side in the lateral direction and is attached to the first punch section of one end side of the plate material 16 that faces the second punch section 15. A predetermined length from the acute-angled tip G at the lower right side of 14, that is, the vertical surface 17a of the step surface 17 for bending guide.
It is in contact with a part H that is separated by a length g and a length of -.

Now, as described above, the plate material 16 is attached to the first punch section 14.
When the cam 18 is held between the pressing member 19 and the cam 18, the inclined surface 18a of the cam 18 comes into contact with the inclined surface 21a of the movable die 21 at approximately the same time, and as the upper mold holder 1 descends, the movable die 21 is moved in the opposite direction of arrow C against the elastic force of the compression coil spring 25. After that, the ram of the press machine (not shown) and the upper mold holder 1 continue to descend as they are, so the acute-angled tip F of the movable die 21 presses the plate 16 upward and pushes the plate 16 into the first punch section] Start bending with the sharp end G of 4 as the center.

When the bending of the plate 16 about the acute upper tip G of the first punch part 14 progresses to a certain extent, one end of the plate 16 comes into contact with the lower surface of the second punch part 15, as shown in FIG. Therefore, bending around the acute-angled tip F of the movable die 21 is also performed. As the acute-angled upper tip F of the movable die 21 presses the plate material 16 in this way, the plate material 16 is bent.As this bending progresses, the movable die 21 is moved by the cam 18 to the first punch portion 1.
4, the acute-angled tip F of the movable die 21 moves to the left (in the direction opposite to the arrow C) so as to approach the plate material 16.
The plate material 16 is pressed and bent without moving much from there, leaving the contact area with the original contact area H as the original contact area H. When the ram of the press machine (not shown) descends to the lowest position, the acute-angled left side of the movable die 21 strongly presses the plate material 16 between it and the bending guide stepped surface 17 of the punch 13. As shown in FIG. 5, the plate material 16 is bent at two points at acute angles in opposite directions to form a substantially Z-shape. Thereafter, the ram of the press machine (not shown) and, in turn, the upper die holder 11 start to rise, and as a result, the movable die 21 is moved in the direction of arrow C by the elastic force of the compression coil spring 25 and separated from the plate material 16, and the pressing member 19
When the plate material 16 rises to the highest position, the first punch section 14 separates from the plate material 16 and releases the clamping of the plate material 16, thereby obtaining the plate material 16 bent into a substantially Z-shape.

In this way, according to this embodiment, as shown in FIG.
Since the structure is such that the plate material 16 is pressed and bent by
There is no risk that the plate material 16 will elongate during the bending process,
Therefore, the length from both bent portions to the leading edge of the image can be set constant. Moreover, the acute-angled tip F of the movable die 2]
Since the position H of the plate material 16 in contact with the plate material 16 hardly changes from the start to the end of the bending process, there is no fear that the plate material 16 will be scratched and the bending process can be performed beautifully.

1. In the above embodiment, the first punch section 14 and the second punch section 15 are separate bodies, but they may be formed integrally. Further, in the above embodiment, the plate material 16 is bent at an acute angle, but it may be bent at a right angle or at an obtuse angle. Changing the bending angle in this way changes the angle of the step surface 17 for bending guide. This can be easily done by changing. Furthermore, the punch 13 and the cam 18 may be provided on the lower mold holder 12, and the pressing member 19 and the movable die 21 may be provided on the upper mold holder 11, etc. The present invention may be modified in various ways without departing from the gist thereof. It is something that can be done.

[Effects of the Invention] As explained above, according to the present invention, the movable die that bends the plate in cooperation with the punch is moved in the lateral direction intersecting the direction of relative movement of both holders to bend the plate. Therefore, the plate material can be bent at two points in opposite directions without causing any problems such as elongation of the plate material or damage to the plate material, which is an excellent effect.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention,
FIG. 1 is a longitudinal sectional front view, FIG. 2 is a longitudinal sectional side view taken along line 1--2 in FIG. 1, and FIGS. 3 to 5 are views corresponding to FIG. Further, FIG. 6 is a longitudinal sectional front view showing a conventional bending mold apparatus, and FIG. 7 is a longitudinal sectional front view showing the same state in the middle of the bending process. In the figure, 11 is an upper mold holder, 12 is a lower mold holder, 13 is a punch, 14 and 15 are first and second punch parts,] 6 is a plate material, 17 is a step surface for bending guide, 18 is a cam, 19 is a pressing member, and 21 is a movable die.

Claims (1)

[Claims] 1. In the case where the plate material is bent at two points in opposite directions, the benders are provided facing each other and moved relative to each other in the direction of approach and separation.
holder, and a first punch part that is provided on one of the two holders and has a large protruding height toward the other holder, and a second punch part that is small. a punch having a step surface for bending guide; a pressing member that clamps the plate material between the first punch part so that one end side of the plate material faces the second punch part; a cam provided on the holder; and a cam provided on the other holder so as to be movable in a lateral direction intersecting the direction of relative movement with the one holder, and located away from the first punch portion on the one end side of the plate material. By contacting a predetermined portion and moving in a lateral direction so as to approach the second punch portion as the two holders move relative to each other in the approaching direction, the cam contacts the cam and approaches the first punch portion. A bending die for a plate material, comprising a movable die that presses the plate material strongly between the bending guide step surface and bends the plate material in opposite directions at two places while maintaining the contact area with the plate material at the original contact area. Device.