JP2510204B2 - Folding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a bending machine for bending a work, and more specifically, to easily apply an overbend to the work. Bending machine.

(Prior Art) Conventionally, various types of bending machines have been known for bending a workpiece. As one of the bending machines, when the work is bent normally, the work is placed on the lower mold, and the upper and lower molds are lowered by the vertical movement of the ram to press the work and the bending mold is rotated. A bending machine that moves and bends a work is known.

(Problems to be Solved by the Invention) In the above-described bending machine, the bending die only bends the work at the time of forward bending, and there is no overbending component. Moreover, an adjusting device for adjusting the amount of overbend according to the change in the plate thickness of the work is not attached.

Therefore, when the conventional bending machine is used to press and bend the work, overbending cannot be performed, which causes a problem.

An object of the present invention is, in order to improve the above-mentioned problems, for example, is a pressing / bending machine capable of overbending by rotating a bending mold as the first work pressing mold descends with respect to a second work pressing mold. To provide.

[Structure of the Invention] (Means for Solving Problems) In view of the conventional problems as described above, the present invention provides a lower mold which is vertically movable and urged upward in a base, It is attached to the lower part of the vertically movable ram, and can rotate the base with an upper mold that can press the work correspondingly to the lower mold and can push down the lower mold against the bias. A first arm which is movably provided and bends upward the end of the work which is narrowed by the lower mold and the upper mold when the upper and lower molds are lowered against the bias. And a bending die having a second arm that is provided with the lower die and that is brought into contact with the lower die and pivoted downward when the lower die is lowered to a predetermined position. The second die of the lower die and the bending die is used to regulate the amount of overbending by the bending die. Arm, an adjusting member provided to be adjustable between those consisting comprise.

(Example) Hereinafter, the Example of this invention is described in detail based on drawing.

Referring to FIG. 1, a lower die 5 as a die for holding a second work is attached to the base 3 of the bending machine 1 so as to extend in the left-right direction. Guide posts 7A and 7B are provided upright on both left and right sides of the base 3, and a ram 11 is fitted into the guide posts 7A and 7B via guide members 9A and 9B. Therefore, the ram 11 is guided by the guide members 9A and 9B to the guide posts 7A and 7B and moved up and down.

An upper die 15 as a first work holding die is attached to the lower part of the ram 11 via an upper lower die holder 13 corresponding to the lower die 5. Brackets 17A and 17B are attached to both left and right ends of the ram 11. A fluid pressure cylinder 19 such as a hydraulic cylinder is provided at both left and right ends of the base 3.
A, 19B is installed, and its fluid pressure cylinder 19A, 19B
Piston rods 21A and 21B are attached to the so as to be vertically movable.

The upper part of the piston rod 21A, 21B is the bracket 1
Support members 25A, 25B mounted in pins 7A, 17B with pins 23A, 23B
It is inserted inside. Stroke adjusting screws 27A, 27B are rotatably attached to the piston rods 21A, 21B.

With the above configuration, when the fluid pressure cylinders 19A, 19B are operated, the piston rods 21A, 21B move up and down. Piston rods 21A, 21B are supporting members 25A, 26B and brackets 17A,
Since it is attached to the ram 11 via 17B, the ram 11 is moved up and down by the vertical movement of the piston rods 21A and 21B.
Guided by A and 7B, the upper mold 15 can move toward and away from the lower mold 5, and bending is performed. The stroke of the ram 11 is adjusted by rotating the screws 27A and 27B to adjust the vertical position.

The structures of the lower mold 5 and the upper and lower molds 15 are shown in FIG. In FIG. 2, for example, a stepped groove 29 is formed in the base 3, and the lower die 5 is attached to the groove 29 with a bolt 31. That is, a groove 5G is formed in the lower portion of the lower die 5, and a spring 33 is interposed between the groove 5G and the groove 29 so as to be biased upward. Therefore, when a pressing force is applied to the lower mold 5, the lower mold 5 is lowered against the biasing force of the spring 33.

In the vicinity of the lower mold 5, for example, in the groove 35 of the base 3 on the right side in FIG. 2, a bending mold 37 is rotatably provided with a shaft 39 as a fulcrum.

The bending die 37 is provided with a first arm 37A and a second arm 37B, and the groove portion 35A of the groove 35 in the base 3 is
For example, a rotating surface 37 having a spherical shape that rotates by contacting 35B
C and 37D are provided.

In the lower part of the upper right part 5R in FIG. 2 of the lower mold, a wedge part agent as an adjusting member for regulating the amount of overbend, that is, the amount of rotation of the bending mold 37 in accordance with the change in the plate thickness of the work W.
41 are provided. The wedge member 41 can be changed according to the plate thickness of the work W so as to match the plate thickness.

With the above configuration, the work W to be bent is placed on the lower die 5, and the ram 11 is lowered to lower the upper die 15,
It contacts the work W on the lower die 5. Further upper mold 15
Lowering the lower mold 5 also causes the spring 33
Descends against the urging force of. As the lower die 5 descends, the work W is subjected to forward bending by the action of the end surface portion of the upper right portion 5R and the end surface portion of the first arm 37A of the bending die 37 in FIG. 2 of the lower die 5. To be done.

That is, when the lower die 5 descends until the wedge member 41 contacts the upper surface of the second arm 37B of the bending die 37, the work W is bent normally. Further, when the lower die 5 descends, the wedge member 41 presses the upper surface of the second arm 37B. As a result, the bending die 37 rotates counterclockwise around the shaft 39 as the fulcrum, and the rotation surfaces 37C and 37D rotate along the grooves 35A and 35B. When the bending die 37 rotates, the left side surface of the first arm 37A acts so as to rotate the work W counterclockwise in FIG. 2, and the work W is overbended. .

In this way, as the lower die 5 descends, the bending die
37 is automatically rotated and the work W is overbend processed. By changing the wedge member 41 according to the change in the plate thickness of the work W, the amount of overbend according to the change in the plate thickness can be adjusted.

In the vicinity of the lower die 5 in the groove 43 of the base 3 on the left side in FIG. 2, a die as a first work holding die
45 is rotatably provided about a shaft 47 as a fulcrum. The mold 45 is composed of a rotating portion 45A having a spherical shape and a supporting portion 45B for supporting the work W at the time of bending, and the rotating portion 45A and the supporting portion.
It is integrated with 45B with bolt 49.

A pin 51 is provided horizontally penetrating the left end 3L of the base 3 in FIG. 2, and the left side of the pin 51 is fixed by a nut member 53. The support portion 45B of the mold 45 is in contact with the tip of the protruding portion of the pin 51, and rotation control is performed so that the support portion 45B does not rotate to the left in FIG.

When the mold 45 is not used, the rotating portion 45A is rotated clockwise so that the supporting portion 45B is located at the position shown by the chain double-dashed line so that it does not act. That is, at the time of the above-described forward bending process, the support portion 45B is
Since it does not act, the state of the two-dot chain line is kept.

A plate pressing member 53 as a second work pressing die is attached to the left side of the upper die 15 in FIG. 2 with a bolt 57 via a spring 55. A bending die 59 having substantially the same shape as that of the bending die 37 is provided in the lower left portion of the upper die 15, and acts at the time of bending in reverse bending. The bending die 59 is provided with a first arm 59A and a second arm 59B.

A wedge member 61 as an adjusting member for adjusting the amount of overbend is provided on an upper part of the plate pressing member 53 protruding to the lower right side.

With the above configuration, when the work W is subjected to reverse bending, the work W is first placed on the support portion 45B of the mold 45, and the upper mold 15 is lowered. When the upper die 15 descends and comes into contact with the lower die 5, the plate pressing member 53 causes the supporting portion 45 of the die 45.
Abut B. When the upper mold 15 further descends, the bending mold 5
Reverse bending is performed by the action of the first arm 59A and the support portion 45B until the tip of the second arm 59B of 9 contacts the wedge member 611. Further, when the upper die 15 descends, the bending die 59 rotates clockwise and the first arm 59
The work W is pressed in the clockwise direction at the tip of A to perform overbend.

By changing the wedge member 61 according to the change in the plate thickness of the work W, the amount of overbend due to the plate thickness of the work W can be adjusted.

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes. For example, the bending die 37 may be provided with a fool hole and attached to the base 3 by a bolt with a spring, as shown by a dotted line in FIG.

[Effects of the Invention] As can be understood from the above description of the embodiments, in short, the present invention comprises a lower mold (5) which is vertically movable on the base (3) and is biased upward. Mounted on the lower part of the vertically movable ram (11), corresponding to the lower mold (5), the work (W) can be narrowed and the lower mold (5) can be pushed against the bias. With the upper mold (15) that can be pushed down,
By the lower mold (5) and the upper mold (15) when the upper and lower molds (5, 15), which are rotatably provided on the base (3) and resist the bias, descend. First arm (37A) that bends the end of the work (W) that has been pressed down.
And a bending die (2) that includes a second arm (37B) that is provided with the lower die (5) and is brought into contact with the lower die (15) and rotated downward when the lower die (5) descends to a predetermined position. 37)
And the second arm (37B) of the lower die (5) and the bending die (37) so as to regulate the amount of overbending by the bending die (37) corresponding to the plate thickness of the work (W). And an adjusting member (41) that is provided between the adjusting member and the adjusting member.

As is apparent from the above configuration, in the present invention,
When the work W is lowered by the upper and lower molds 15 and 5, the end portion of the work W is bent upward by the first arm 37A of the bending mold 37, and the lower part 5 is lowered by the lower mold 5. The second arm 37B of the bending die 37 is the die 5
When is pressed and rotated downward, the bending die 37 is rotated, and the first arm 37A performs overbend.

Therefore, the spring back of the work W can be corrected, and the end portion of the work W can be bent accurately.

Further, as is apparent from the above-mentioned configuration, between the lower die 5 and the second arm 37B of the bending die 37, it is possible to adjust so as to regulate the amount of overbend corresponding to the plate thickness of the work W. Since the adjusting member is provided, even if the plate thickness of the work W changes, overbending can be accurately performed without excess or deficiency.

[Brief description of drawings]

FIG. 1 is a schematic front view of a bending machine according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view taken along the line II-II in FIG. [Explanation of symbols showing main parts of the drawing] 1 ... Bending machine, 2 ... Base 5 ... Lower mold (second work clamp mold) 11 ... Ram 15 ... Upper mold (No. 1 Work pressing die) 37 …… Bending die 37A, 37B …… First and second arms 41 …… Wedge member

Claims (1)

(57) [Claims] 1. A lower mold (5) provided on a base (3) which is vertically movable and biased upward, and a lower mold which is mounted on a lower part of a vertically movable ram (11). Corresponding to (5), the work (W) can be freely compressed and the upper mold (15) capable of pushing down the lower mold (5) against the bias is rotated to the base (3). Workpiece (W) which is provided so as to be capable of being narrowed by the lower mold (5) and the upper mold (15) when the upper and lower molds (5, 15) are lowered against the bias. Arm (37A) that bends the end of the
And a bending mold (2) that includes a second arm (37B) that is provided with the lower mold part (5) and contacts the lower mold (15) and is rotated downward when the lower mold part (5) descends to a predetermined position. 37)
And the bending die (37) corresponding to the plate thickness of the work (W).
And an adjusting member (41) adjustably provided between the lower die (5) and the second arm (37B) of the bending die (37) in order to regulate the amount of overbending due to A bending machine characterized by that.