JPH03106513A - Bending die device for plate - Google Patents

Abstract

PURPOSE:To enable the bending of a plate like an acute angle with the use of a press machine, by moving a three point bending member to perform the bending of a plate with the cooperation with a punch in the horizontal direction crossed with the relative moving direction of both holders. CONSTITUTION:A three point bending member 18 is moved in the same direction as the relatively moving direction of the approaching direction of both holders 11, 12 to a punch 13, when the both holders are moved relatively in the approaching direction. Also a cam 15 is abutted on a cam receiver 16, moving the three point bending member 18 in the horizontal direction toward a projection part 14 for a bend guide. The three point bending member 18 is moved in the relatively moving direction of the both holders to the punch in the state of abutting to the tip side part of a plate member 23 and also moved toward the bend guiding projection part 14. Thus the tip side part of the plate member 23 can be subjected to bending in an acute angled shape along the bend guiding projection part 14.

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 is attached to a press machine and bends a plate material into an acute angle shape.

(Prior Art) When bending a plate material, for example, at a right angle, using a press, a bending die device as shown in FIG. 5 has conventionally been used. That is, the die 1, which is the lower mold, is installed on the bed side of the press machine, and the punch 2, which is the upper mold, is installed on the ram side of the press.

Then, when the punch 2 is lowered by the ram, the plate material 3 is bent at a right angle by the cooperative action of the die 1 and the punch 2.

(Problem to be Solved by the Invention) However, after the bending process, the plate material 3 slightly returns from the right angle bending state shown by the two-dot chain line in FIG. 6 to the obtuse angle bending state due to springback. I end up. The amount of springback increases as the bending radius R increases.

In order to bend a plate at a right angle, it is sufficient to take into account the amount of spring hback during bending and bend the plate into an acute angle, but with the conventional bending machine described above, the bending process requires only the downward movement of the punch 2. Because it is bent, it cannot be bent into an acute angle. Therefore, when bending a plate material into an acute angle shape, a special bending machine has been manufactured to bend the plate material into an acute angle shape, but this increases the equipment cost.

The present invention has been made in view of the above-mentioned circumstances, and its object is to provide a bending die device for plate materials that can bend a plate material into an acute angle shape using a press machine.

[Structure of the Invention] (Means for Solving the Problems) The bending die device for plate materials of the present invention is provided with two holders facing each other so as to be relatively movable in the approaching and separating directions, and having acute-angled bending guides on the sides. A punch having a convex portion for use is provided on one of the holders, a pressing member is provided on the punch for pressing a plate material and sandwiching the plate material between the punch, and a cam is provided on the one holder, A cam receiver is provided in the other of the two holders, and the cam receiver is moved in the lateral direction so as to come into contact with the cam and approach the bending guide protrusion of the punch as the holders move relative to each other in the approaching direction, and the cam A pressing and bending member is provided so as to move in the lateral direction integrally with the receiver, and the two holders are brought close to each other while the pressing and bending member is in contact with the tip side portion of the plate that protrudes from the bending guide convex portion of the punch. The distal end portion of the plate is bent at an acute angle along the bending guide convex portion by relative movement in the direction and lateral movement integrally with the cam receiver, and The present invention is characterized in that a die is provided that presses the bent portion of the plate material strongly against the bending guide convex portion at the end of the relative movement.

(Function) When both holders move relative to each other in the approaching direction, the pressing and bending member moves in the same direction relative to the punch in the relative movement direction of both holders in the approaching direction. Further, the cam comes into contact with the cam receiver to move the pressing and bending member laterally toward the bending guide convex portion. Then, the pressing and bending member moves in the direction of relative movement of both holders with respect to the punch while being in contact with the tip side of the plate material, and moves toward the bending guide convex portion, thereby moving the pushing and bending member toward the tip side of the plate material. The portion is bent into an acute angle along the bending guide convex portion.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. Note that this embodiment is applied to the case where a plate material is bent into an acute angle in consideration of the amount of springback in order to obtain a plate material bent at a right angle.

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 12. Reference numeral 13 denotes a punch attached to the upper die holder 11, and an acute bending guide protrusion 14 is formed on the side of the punch. The bending guide protrusion 14 is formed by forming the side surface of the punch 13 into an inclined surface such that the amount of outward protrusion gradually increases downward.
The lower end portion of the punch 4 is formed into an arcuate convex surface 14 a having a relatively large diameter, and is connected to the lower surface of the punch 13 . Note that the angle θ of the bending guide convex portion 14 is set to an acute angle smaller than a right angle by the return angle due to springback of the plate material to be bent. A cam 15 is attached to the upper die holder 11 on both front and rear sides of a portion laterally separated from the punch 13, and has an inclined surface 15a formed on the lower side surface.

On the other hand, reference numeral 16 denotes a pair of cam receivers disposed on the lower die holder 12 in correspondence with the pair of cams 15, and this is supported by a slide guide 17 attached to the lower die holder 12, which allows the holders 11 and 12 to move relative to each other. The cam 15 is supported so as to be movable in the lateral direction intersecting the up-down direction, that is, the left-right direction, and an inclined surface 16a that abuts the inclined surface 15a of the cam 15 is formed on the upper side surface. Reference numeral 18 denotes a roller serving as a pressing and bending member provided between the pair of cam receivers 16, and this roller is rotatably supported by the cam receivers 16 so as to connect the pair of cam receivers 16. A stopper 19 is attached to the lower die holder 12, and a threaded rod 20 attached to the cam receiver 16 is inserted through the stopper 19. 21 is a compression coil spring wound around a threaded rod 20;
This exerts a resilient force between the washer 22 attached to the tip of the threaded rod 20 and one stopper, thereby urging the cam receiver 16 in the direction of arrow A, which is the return direction. Therefore, the cam receiver 16 is always in a position where it contacts one stopper,
At this time, the roller 18 is located horizontally apart from the bending guide convex portion 14 of the punch 13 by an amount corresponding to the thickness of the plate material 23 to be bent.

24 is a die attached to the lower die holder 12 so as to be located below the roller 18, and this die has a circular arc whose diameter is larger than the circular convex surface 14a of the bending guiding convex portion 14 by the thickness of the plate material 23. A concave surface 24g is formed. Reference numeral 25 denotes a plate-shaped pressing member disposed on the lower mold holder 12 so as to be movable up and down, and this member has approximately the same size as the lower surface of the punch 13 and is placed directly below the punch 13. There is. 26 is a compression coil spring provided between the lower mold holder 12 and the pressing member 25, which always urges the pressing member 25 upward, and the pressing member 25 is always approximately at the same level as the top of the roller 18. It has been pushed up to a height of .

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

As shown in FIG. 1, the plate material 23 to be bent is placed across the rollers 18 and the pressing member 25, and the upper mold holder 11 is lowered by a ram of a press machine (not shown). Then, the punch 13 comes into contact with the plate material 23 and pushes it down together with the pressing member 25, so that the pressing member 2
5 presses the plate material 23 against the lower surface of the punch 13 by the elastic force of the compression coil spring 26, so that the plate material 23 is held between the punch 13 and the punch 13. Since the upper mold holder 11 continues to descend in this state, the roller 18 in contact with the tip end portion of the plate material 23 protruding from the bending guide convex portion 14 of the punch 13 moves the tip end portion of the plate material 23. The plate material 23 is pressed relatively upward, and as a result, the plate material 23 is bent along the arcuate convex surface 14a of the bending guide convex portion 14, as shown in FIG.

Now, when the plate material 23 is bent to a substantially right angle by the bending action of the roller 18 accompanying the lowering of the lower die holder 11 and the punch 13, the inclined surface 15a of the cam 15 comes into contact with the inclined surface 16a of the cam receiver 16. become. As a result, the cam receiver 16 and thus the roller 18 begin to move in the opposite direction of arrow A toward the bending guide convex portion 14 of the punch 13. As a result, the roller 18 moves obliquely upward relative to the punch 13 along the inclined side surface 14b of the bending guide convex part 14, so that the temporary material 23 is moved onto the arcuate convex surface 14a of the bending guide convex part 14. It is pressed along the slope 14b and bent into an acute angle. And punch 1
3 descends to the lowest position, as shown in Figure 4,
The arcuate convex surface 14a of the bending guiding convex portion 14 strongly presses the arcuate bent portion (corner part) 23a of the plate material 23 against the arcuate concave surface 24a of the die 24 (so-called "pushing"), thereby pressing the bent portion of the plate material 23. 23a is formed into an arc shape that matches the arc convex surface 14a. In the bending process of the plate material 23 as described above, the portion of the plate material 23 pressed by the roller 18 moves from the bent portion 23a toward the tip.
At this time, the roller 18 moves while rotating, so
There will be no scratches on the plate material 23.

Now, when the punch 13 descends to the lowest position, the ram of the press (not shown) and therefore the upper mold holder 11 start to rise. As a result, the punch 13 rises, and as the punch 13 rises, the pressing member 25 pushes out the plate material 23 from the arcuate concave surface 24a of the die 24, and the cam receiver 16 and eventually the roller 18 are moved by the elastic force of the compression coil spring 21 as indicated by the arrows. It moves in the direction A and separates from the plate material 23, thus returning each part to its original state as shown in FIG.

Now, when the roller 18 separates from the plate material 23 as described above, the bent portion of the plate material 23 is restored by springback. However, since the plate material 23 was bent at an acute angle due to the force 5, it will be bent at a right angle when it returns slightly due to springback.

According to this embodiment, the roller 18 that bends the plate material 23 in cooperation with the punch 13 moves laterally, so that the plate material is bent at an acute angle by the lateral movement of the roller 18 and the downward movement of the punch 13. Even if there is springback, the plate material 23 can be bent at right angles. Moreover, since the configuration is such that the downward movement of the upper mold holder 11 is converted into the lateral movement of the roller 18 by the cam 15 and the cam receiver 16, the upper mold holder 11 can be lowered with a simple configuration without providing a separate drive source. Roller 18 using the motion
can be moved laterally, and manufacturing costs can be reduced.

In addition, in the above embodiment, the roller 18 is rotatably provided on the cam receiver 16, but it is not particularly necessary to provide it rotatably.
It may be fixed. Further, the pressing and bending member is not limited to the roller 18, but may be a pressing die having an inclined surface that matches the inclined surface 14b of the bending guide convex portion 14, and may be fixed to the cam receiver 16. , it may be formed integrally with the cam receiver. Furthermore, Bonchi 13, Cam 15
are provided on the lower mold holder 12, and a cam receiver 16, a roller 18,
A die 24 or the like may be provided on the upper mold holder 11.

In addition, in the above embodiment, the explanation was applied to the case where the plate material is bent into a right angle shape in a springback state, but it is applied to the case where the plate material is bent into an acute angle shape in a springback state. Also good.

[Effects of the Invention] As is clear from the above description, according to the present invention, the pressing and bending member that works with the punch to bend the plate material can be moved in the lateral direction intersecting the relative movement direction of both holders. This allows the plate material to be bent into an acute angle using a press machine, and with a simple configuration, the movement of the holder can be moved horizontally, reducing manufacturing costs. can be achieved.

Figure 1 is a partially vertical front view, Figure 2 is a vertical side view taken along the line ■-■ in Figure 1, Figure 3 is a view equivalent to Figure 1 showing a state in the middle of bending, and Figure 4 is a partial longitudinal sectional front view. The figure is a diagram equivalent to Figure 1 showing the state at the end of the bending process, Figure 5 is a partial longitudinal sectional view for explaining the conventional bending die device, and Figure 6 is the state of the plate material after the bending process. FIG.

In the figure, 11 and 12 are upper and lower die holders, 13 is a punch, 14 is a convex part for bending guide, 15 is a cam, 16 is a cam receiver, 18 is a roller (pushing and bending member), 23 is a plate material, 24
25 is a die, and 25 is a pressing member.

Figure 1

Claims (1)

[Claims] 1. Two holders that are provided in a state of facing each other and are moved relative to each other in the approaching and separating directions, and a punch that is provided on one of these holders and has an acute-angled bending guide protrusion on the side thereof;
a pressing member disposed between the other holder of the two holders and the punch and pressing a plate material against the punch and sandwiching the plate material between the punch; a cam provided on the one holder; a cam receiver that is provided on the other holder and moves laterally to come into contact with the cam and approach the bending guide protrusion of the punch as the holders move relative to each other in the approaching direction; and a cam receiver that is integrated with the cam receiver. The distal end portion of the plate, which is provided so as to be moved in the lateral direction and protrudes from the punch in the lateral direction, is moved relative to the approach direction of both the holders and lateral movement integrally with the cam receiver to guide the bending. A pressing and bending member that bends into an acute angle shape along the convex portion is provided on the other holder, and the bent portion of the plate material is strongly pressed between the bending portion and the bending guide convex portion at the end of the relative movement of both holders in the approaching direction. A bending die device for sheet material, comprising a die for bending.