JPH0733413U - Mold for press bending machine - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent bending of a long work when bending using a die for a press bending machine. [Structure] The male die is provided with a forming die portion at its tip and a work holding surface flush with the bottom surface of the forming die portion, while the female die is provided with a work holder for holding the work together with the male work holding surface. It is provided slidably, and the mold part can be freely rotated around the axis in the bending width direction in cooperation with the work holder, and the female mold part becomes the male mold part by the male and female mold matching operation. It is characterized in that the workpiece is bent by rotating it toward.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a metal mold for a press bending machine, and more particularly to a metal mold capable of preventing waist bending when bending a long object.

[0002]

[Prior art]

 Normally, in a press bending machine, a plate-shaped work is set between an upper mold (male mold) and a lower mold (female mold), and a predetermined load is applied to the plate-shaped work by combining the two molds. Bending of the work into a desired shape is performed.

Conventionally, in this type of die for a press bending machine, as shown in FIG. 5, a molding die portion 101 extending obliquely downward to the upper die 100 is formed on the upper surface of the lower die 200 in a V-shaped groove shape. The structure in which the mold portion 201 is formed has been adopted. In the figure, 300 is a plate-shaped work.

[0004]

[Problems to be solved by the device]

 However, in the conventional die for a press bending machine, as shown in FIG. 5, the other end side of the work 300 is lifted upward as the bending work is performed, so that the work is lifted when the work is long. In addition, an excessive load may be applied to the other end of the work, causing hip breakage.To prevent this, the operator must manually support the movement of the work, and the work is complicated. was there.

In view of such problems, it is an object of the present invention to provide a die for a press bending machine capable of preventing waist bending when bending a long work.

[0006]

[Means for Solving the Problems]

 Therefore, the die for a press bending machine according to the present invention is a die for a press bending machine that bends a work by applying a predetermined load by a die-matching operation of a male die and a female die. A forming die part is formed at the tip of the forming die and a work holding surface that is flush with the bottom surface of the forming die part is formed. The mold part is provided rotatably around the axis in the bending width direction in cooperation with the holder, and the work holder or the mold part is biased to a predetermined position by the spring member, and by the mold matching operation of the male mold and the female mold. It is characterized in that the female mold part is rotated toward the male mold part to bend the work.

The female mold part may be provided with a bearing so as to be rotatably supported by a rotary shaft, but when the molds are combined and the bending width is set, the bearings interfere and the molds are brought into close contact with each other. Since this is difficult to do, the molding die part of the female die is formed into a substantially semi-cylindrical shape, and a guide surface of a substantially semi-cylindrical shape is formed on the female die to guide the rotation of the molding die portion. Good to configure. Regarding the shape of the forming die, if the female die has a claw-shaped die protruding from the side edge on the rotation side and the male die has its upper surface formed at an acute angle with respect to the bottom surface, the shape of the work piece will depend on the degree of die matching. The bending angle can be adjusted freely. The male mold and the female mold may be moved by moving either the male mold or the female mold, or both may be relatively moved.

[0008]

[Action and effect of the device]

 When the male and female dies are matched, the male work piece pressing surface of the female die slides the work holder, and the forming die part that works together with this moves toward the male forming die part around the axis in the bending width direction. The work is bent by both molds. At this time, the work remains held between the male work holding surface and the female work holder, and the other end is not lifted.

As a result, the work can be prevented from bending and the complicated work of supporting the work by hand is not required, so that the workability can be significantly improved and the bending work can be speeded up.

[0010]

【Example】

 Hereinafter, the present invention will be described in detail based on specific examples shown in the drawings. 1 to 3 show a die for a press bending machine according to an embodiment of the present invention. The mold for a press bending machine is composed of an upper mold 1 which is a male mold and a lower mold 2 which is a female mold. The upper mold 1 is provided with a mounting portion 10 for a bending machine at the upper end thereof. A molding die 11 is provided on the side of the lower end. The forming die part 11 has a shape in which a substantially triangular shape having an acute angle θ between the top surface and the bottom surface is continuous in the bending width direction, and the lower end surface of the upper die 1 is the same as the bottom surface of the forming die part 11. It is formed uniformly and flatly, and the lower end surface thereof is a work holding surface 12 that holds the work W.

On the other hand, in the lower mold 2, a groove 21 for mounting on a bending machine is formed on the bottom surface of the mold base 20, and a recess 22 is formed in the mold base 20 so as to open to the upper surface. A work holder 23 having a substantially L-shaped side face is housed in the recess 22 so as to be slidable up and down, and the upper surface of the work holder 23 is formed flat so that the work holding surface 12 of the upper die 1 and the work can be supported. It is designed to hold W.

In addition, a substantially semi-cylindrical guide concave surface 26 is formed in the mold base portion 20 of the lower mold 2 so as to be continuous with the concave portion 22, and the guide concave surface 26 has a substantially semi-cylindrical forming mold portion 24. Is rotatably housed around an axis in the bending width direction, and the molding die portion 24 is guided by the guide concave surface 26 for its rotation.

An arcuate claw portion 25 is projected on one side edge of the forming die portion 24, the upper surface of the other side edge portion is formed flat, and a step portion 27 is formed on the work holder 23 to form the forming die portion. 24 is abutted against the upper surface of the other side edge portion, and a spring member 28 is housed between the work holder 23 and the bottom surface of the recess 22 for housing the work holder 23, so that the work holder 23 is biased upward. The work holder 23 and the molding die 24 are associated with each other. Regarding the bending width direction, both the upper mold 1 and the lower mold 2 have a structure in which the same structure as the above is continuous in the bending width direction.

Next, the function and effect will be described. When performing bending, a plurality of upper dies 1 and lower dies 2 having different bending widths are appropriately selected to obtain a desired bending width, and this is attached to a press bending machine. As shown in FIG. 2, after the work W is set between the upper mold 1 and the lower mold 2, the press bending machine is operated to lower the upper mold 1 and lower the work holding surface 12 of the upper mold 1 and the lower mold. When the work W is clamped between the upper surface of the work holder 23 of the mold 2 and the upper mold 1 is further lowered, the work holder 23 is pushed downward against the urging force of the spring member 28, and accordingly the lower mold 1 is pressed. The second forming die portion 24 rotates in the direction of the arrow in FIG. 2, and the work W is bent by the arcuate claw portion 25 of the lower die 2 and the forming die portion 11 of the upper die 1, so that the work W is bent.

At this time, the work W is held horizontally by being clamped by the work holding surface 12 of the upper mold 1 and the work holder 23 of the lower mold 2, and the other end is lifted upward like a conventional mold. Since it does not occur, even if it is a long work W, waist bending does not occur, and complicated work such as supporting the work by hand is not required, and workability can be greatly improved and work speed can be increased.

Further, in the die for the press bending machine of this example, the mounting portions 10 and 21 of both the upper die 1 and the lower die 2 have the same structure as the conventional one, so that a dedicated press bending machine is prepared. There is no need to do so, and it can be applied as is to existing press bending machines.

Further, the forming die portion 11 of the upper die 1 is formed into an acute angle shape, the arcuate pawl portion 25 is formed on the forming die portion 24 of the lower die 2, and the arcuate pawl portion 25 is displaced in the circumferential direction. Since bending is performed, the bending angle of the work W can be freely adjusted by selecting the amount of lowering of the upper die 1, as shown in FIG. As a result, even when there is a springback due to the material of the work W, it is possible to efficiently perform an appropriate bending process in consideration of this.

When the bending process is completed, the upper die 1 rises and the work holder 23 of the lower die 2 is slid upward by the urging force of the spring member 28, and the forming die portion 24 is also moved to its original position by its own weight. Return to rotation.

FIG. 4 shows a die for a press bending machine according to a second embodiment of the present invention. In this embodiment, the rotation of the molding die portion 24 of the lower mold 2 is not guided by the guide concave surface 26, but a rotary shaft 29 is provided and the molding die portion 24 is rotatably attached thereto.

[Brief description of drawings]

FIG. 1 is a side view showing a mold for a press bending machine according to an embodiment of the present invention.

FIG. 2 is a view for explaining the operation of the press bending machine die.

FIG. 3 is a partially enlarged view of FIG.

FIG. 4 is a side view showing a mold for a press bending machine according to another embodiment of the present invention.

FIG. 5 is a perspective view showing a conventional die for a press bending machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper mold (male mold) 11 Molding mold part 12 Work holding surface 2 Lower mold (female mold) 23 Work holder 24 Molding mold part 25 Arc claw part 26 Guide concave surface 28 Spring member W Work

Claims (3)

[Scope of utility model registration request] 1. A mold for a press bending machine for bending a work by applying a bending load by a mold matching operation between a male mold and a female mold, wherein the male mold has a molding die portion at its tip and the molding die. A work holding surface that is flush with the bottom surface of the portion is formed, while a work holder that holds the work together with the male work holding surface is slidably provided on the female mold, and cooperates with the work holder. A molding die portion is rotatably provided around an axis in the bending width direction, the work holder or the molding die portion is biased to a predetermined position by a spring member, and the female die is moved by a die matching operation of the male die and the female die. A mold for a press bending machine, characterized in that the mold forming part is rotated toward the male forming part so that the work can be bent. 2. The molding die portion of the female die has a substantially semi-cylindrical shape, and the female die has a substantially semi-cylindrical guide surface, and the guide surface guides the rotation of the molding die portion. The mold for a press bending machine according to claim 1, wherein: 3. A female mold forming part is provided with a claw-shaped mold part projecting at a side edge on a rotation side, and the male mold part has an upper surface formed at an acute angle with respect to a bottom surface. The mold for a press bending machine according to claim 1.