JP2024115252A - Bending Equipment - Google Patents

Abstract

[Problem] To provide a bending device that performs bending with high accuracy using an inexpensive configuration. [Solution] The bending device includes a clamping section that clamps a plate-shaped workpiece W with one end of the workpiece W exposed, a cam slider 15 that is provided so as to be able to reciprocate between a pressing position where the workpiece W1 is pressed and bent, and a retracted position where the workpiece W1 is retracted from the pressing position in the opposite direction to the movement direction in which the workpiece W1 is bent, and a cam driver 14 that is provided so as to be able to reciprocate in a direction intersecting the reciprocating direction of the cam slider 15 and that reciprocates the cam slider 15. In the bending device 1, which bends W1 in the thickness direction of the processed portion W1, the cam driver 14 has an abutment surface portion 14a2 that abuts against the cam slider 15 to move the cam slider 15 to the pressing position, and a retraction surface portion 14a4 that is retracted from the cam slider 15 beyond the abutment surface portion 14a2 in the moving direction of the cam driver 14, and the cam slider 15 reciprocates in the order of the pressing position, the retraction position, and the pressing position by the reciprocating movement of the cam driver 14. [Selected Figure]

Description

The present invention relates to a bending device.

There is a conventional bending device that clamps a plate-shaped workpiece and presses one end of it with a bending section to bend it.

When bending a workpiece using this type of bending device, there is a problem in that the desired bent shape cannot be obtained due to springback after bending.

For example, as shown in FIG. 9(a), while the workpiece W is clamped between the pad 101 and the lower die 102, bending is performed on the workpiece W's workpiece portion W1 with the bending blade 103. During this process, tensile stress is generated on the outside of the bent portion of the workpiece W, and compressive stress is generated on the inside. In this state, as shown in FIG. 9(b), when the bending blade 103 is retracted from the workpiece W1 and the pressing force on the workpiece W1 is removed, the elastic restoring force of the workpiece W causes springback, which causes the bent portion to deform in the direction of returning to its original shape.

In response to this, for example, Patent Document 1 discloses a bending device that uses a first die to bend the workpiece so that a bend allowance remains, and then uses a second die to bend the workpiece into its final shape.

By dividing the bending process into two steps as in Patent Document 1, it is possible to reduce the amount of springback during the second bending process compared to when bending is performed in a single step, or to bend the first bending process into a shape that is less likely to cause springback during the second bending process, allowing the final shape to be closer to the desired shape.

Patent No. 7008159

However, when bending using different forming dies as in Patent Document 1, there is a problem that it leads to increased costs for the processing equipment. Also, while it is possible to perform two bending processes using the same forming die, in this case, another problem arises in that the bending time is lengthened by using one forming die, which affects the overall takt time.

The objective of the present invention is to provide a bending device that is inexpensive and capable of performing bending with high precision.

In order to solve the above problems, the present invention provides a bending device that includes a clamping section that clamps a plate-shaped workpiece with one end of the workpiece exposed, a bending section that is provided so as to be able to move back and forth between a pressing position where the workpiece is pressed and bent, and a retreat position where the workpiece is retreated from the pressing position in the opposite direction to the movement direction in which the workpiece is bent, and a moving section that is provided so as to be able to move back and forth in a direction intersecting the reciprocating movement direction of the bending section and that moves the bending section back and forth, and that bends the workpiece in the thickness direction of the workpiece, and at least one of the moving section or the bending section has an abutment surface section that abuts against the other of the moving section or the bending section to move the bending section to the pressing position, and a retreat surface section that is retreated from the moving section or the other of the bending section from the abutment surface section in the movement direction of the moving section, and the bending section reciprocates in the order of the pressing position, the retreat position, and the pressing position due to the reciprocating movement of the moving section.

According to the present invention, the bending part can be pressed, retracted, and pressed against the workpiece by a single reciprocating movement of the moving part. By retracting the bending part after the first pressing, springback is intentionally generated in the workpiece, and then the bending part is moved to the pressing position to perform bending again. This makes it possible to reduce the second springback, and to perform bending with high precision. Furthermore, since these operations can be performed by a single bending device, bending can be completed quickly with an inexpensive configuration.

The present invention allows for accurate bending with an inexpensive configuration.

1 is a schematic configuration diagram of a bending device according to an embodiment of the present invention; FIG. 2 is a diagram showing a state in which the upper die is lowered further than in FIG. 1 . FIG. 3 is a diagram showing a state in which the upper die has been lowered further than in FIG. 2 and the workpiece is clamped. 11A to 11D are diagrams illustrating a process of bending a workpiece by vertical movement of a cam driver. FIG. 13 is a perspective view showing a modified example of the cam slider. 13A to 13C are diagrams illustrating how the contact roller follows each surface of the cam driver as the cam driver moves up and down. 2A to 2C are diagrams illustrating the follow-up ability of a cam slider to a cam driver in the embodiment of FIG. 1 . 13A and 13B are diagrams illustrating modified examples of the cam slider. 4A and 4B are diagrams illustrating springback due to bending.

The following describes an embodiment of the present invention with reference to the drawings.

Figure 1 is a schematic diagram showing a bending device according to one embodiment of the present invention. The bending device of this embodiment is a bending device for bending a plate-shaped workpiece.

As shown in FIG. 1, the bending device 1 has an upper die 11, a lower die 12, a pad 13, a cam driver 14 as a moving part, a cam slider 15 as a bending part, a support slider 16, and the like.

The pad 13 is held by the upper die 11 via a spring 17. The pad 13 has a first clamping portion 13A. The upper die 11 is provided with a side pin 18 to prevent the pad 13 from falling off the upper die 11. One end of the side pin 18 is held by the upper die 11, and the other end is provided so as to be able to abut against the pad 13.

The workpiece W is placed on the lower die 12, and one end portion of the workpiece W including the processed portion W1 is exposed from the lower die 12.

The cam driver 14 is a moving part that contacts the cam slider 15 and the support slider 16 to move them individually back and forth in the left-right direction in FIG. 1. The cam driver 14 moves back and forth in the up-down direction in conjunction with the movement of the upper die 11 in the pressing direction. The movement direction of this cam driver 14 is a direction that intersects with the left-right direction in FIG. 1, which is the movement direction of the cam slider.

The cam driver 14 has a first inclined surface portion 14a1, a contact surface portion 14a2, a second inclined surface portion 14a3, and a retreat surface portion 14a4 on the cam slider 15 side, which is the left side in FIG. 1. In order from the bottom of FIG. 1, the first inclined surface portion 14a1, the contact surface portion 14a2, the second inclined surface portion 14a3, and the retreat surface portion 14a4 are continuously provided. The retreat surface portion 14a4 is a surface portion that is retreated from the contact portion of the cam slider 15 against the cam driver 14 beyond the contact surface portion 14a2, and is a surface portion that is located to the right of the contact surface portion 14a2 in FIG. 1.

The cam driver 14 also has an inclined surface portion 14b1 and a flat surface portion 14b2 on the right side of FIG. 1.

The cam slider 15 is provided so as to be movable in the left-right direction in FIG. 1. The cam slider 15 has a bending blade 15A, which is a pressing part that presses and bends the processed part W1 of the workpiece W. The cam slider 15 also has a first inclined surface portion 15a1, an abutment surface portion 15a2, a second inclined surface portion 15a3, and a retreat surface portion 15a4, which are arranged in this order from the top of FIG. 1, on the cam driver 14 side. The retreat surface portion 15a4 is a surface portion that is retreated from the abutment portion of the cam driver 14 against the cam slider 15 relative to the abutment surface portion 15a2, and is a surface portion that is arranged to the left of the abutment surface portion 15a2 in FIG. 1. The cam slider 15 is urged to the right in FIG. 1 by an urging member such as a spring (not shown) to be positioned in the position shown in FIG. 1.

The support slider 16 is provided so as to be movable in the left-right direction in FIG. 1. The support slider 16 has a second clamping portion 16A on the left side of FIG. 1, which is the side of the processed portion W1 of the workpiece W. The support slider 16 also has a first inclined surface portion 16a1 and a flat surface portion 16a2 on the side facing the descending cam driver 14. The support slider 16 is biased to the left in FIG. 1 by a biasing member such as a spring (not shown) and is positioned in the position shown in FIG. 1.

Next, the process of bending the workpiece W1 of the workpiece W using the bending device 1 will be described. The bending device 1 bends the workpiece W1 in its thickness direction. This "thickness direction" refers to the thickness direction of the workpiece W1 before bending. In addition, this does not necessarily mean a direction that is strictly the same as the thickness direction, but rather a direction that has a vector in the thickness direction.

First, by lowering the upper mold 11 from the position shown in FIG. 1, the inclined surface portion 14b1 of the cam driver 14 comes into contact with the first inclined surface portion 16a1 of the support slider 16 as shown in FIG. 2. As the cam driver 14 descends, the first inclined surface portion 16a1 moves along the inclined surface portion 14b1, and the support slider 16 moves to the right in FIG. 2.

By further lowering the cam driver 14, as shown in FIG. 3, the cam driver 14 climbs over the first inclined surface portion 16a1 of the support slider 16 and abuts the flat surface portion 14b2 against the flat surface portion 16a2. As a result, the support slider 16 is positioned at the right end of the left-right movement range in FIG. 3. In this state, the second clamping portion 16A of the support slider 16 abuts on the lower surface of the portion of the workpiece W that is closer to the other end than the processed portion W1 on one end side of the workpiece W. In addition, by lowering the upper mold 11 to the position shown in FIG. 3, the pad 13 is lowered and the first clamping portion 13A of the pad 13 abuts on the upper surface of the portion of the workpiece W that is closer to the other end than the processed portion W1. As a result, the processed portion W1 of the workpiece W is clamped by the first clamping portion 13A of the pad 13 and the second clamping portion 16A of the support slider 16. In this way, the first clamping portion 13A and the second clamping portion 16A form a clamping portion that clamps the workpiece W.

Even if the cam driver 14 moves further downward than the position shown in FIG. 3, the flat surface portion 14b2 abuts against the flat surface portion 16a2, so the left-right position of the support slider 16 relative to the cam driver 14 does not change. In other words, in the subsequent bending process, the support slider 16 is held in the position shown in FIG. 3. Even if the upper die 11 descends further than the position shown in FIG. 3, the spring 17 is compressed by the amount of the upper die 11 descending, and the position of the pad 13 does not change. In other words, even if the upper die 11 descends further from the position shown in FIG. 3, the positions of the pad 13 and the support slider 16 do not change, and the first clamping portion 13A and the second clamping portion 16A maintain a state in which they are clamping a part of the workpiece W in the same position as in FIG. 3. Also, due to the elasticity of the spring 17, the pad 13 is pressed against the workpiece W from above, and the clamping portions securely clamp the workpiece W and fix it in position.

In addition, in the position shown in FIG. 3, the first inclined surface portion 14a1 of the cam driver 14 abuts against the first inclined surface portion 15a1 of the cam slider 15. As the cam driver 14 is lowered, the first inclined surface portion 15a1 moves along the first inclined surface portion 14a1, and the cam slider 15 moves to the left in FIG. 3 against the biasing force of the spring. The movement of the cam slider 15 will be explained below with reference to FIGS. 4(a) to (d).

As the cam driver 14 descends, the cam slider 15 moves leftward in FIG. 4, as shown in FIG. 4(a), and the bending blade 15A comes into contact with the workpiece W1 of the workpiece W. In this state, the cam driver 14 is further lowered, so that the bending blade 15A presses the workpiece W1 leftward in FIG. 4 to perform the bending process. Then, as shown in FIG. 4(b), the cam driver 14 descends to a position where the abutment surface 14a2 of the cam driver 14 abuts the abutment surface 15a2 of the cam slider 15, and the cam slider 15 reaches the left end position of the left-right movement range in FIG. 4. This position is the pressing position where the bending blade 15A presses the workpiece W1 in the bending direction. This completes the first bending process of the workpiece W1 by the bending blade 15A.

By further lowering the cam driver 14 from this state, as shown in FIG. 4(c), the retraction surface 14a4 of the cam driver 14 abuts against the abutment surface 15a2 of the cam slider 15. Also, the abutment surface 14a2 of the cam driver 14 abuts against the retraction surface 15a4 of the cam slider 15. As a result, the cam slider 15 moves to the right in FIG. 4 from the position in FIG. 4(b) by the spring force by the amount of retreat of the retraction surface 14a4 from the abutment surface 14a2 to the right in FIG. 4. In other words, the cam slider 15 retracts in the opposite direction to the pressing direction against the processed part W1 from the pressing position in FIG. 4(b). This position of the cam slider 15 in FIG. 4(c) is the retraction position of the cam slider 15. As the cam slider 15 moves to the retracted position, the pressing force of the bending blade 15A on the workpiece W1 is released, causing springback in the workpiece W1. Between Figures 4(b) and 4(c), the cam driver 14 descends, causing the inclined surface portion 15a3 to move along the inclined surface portion 14a3, and the cam slider 15 gradually moves to the right in Figure 4.

In the above description, in the retracted position of the cam slider 15 in FIG. 4(c), the bending blade 15A is not in contact with the workpiece W1, but the present invention is not limited to this. In other words, the above "retracted position" means a position where the cam slider 15 is retracted in the opposite direction to the movement direction (leftward in FIG. 4) that bends the workpiece from the "pressing position," and does not necessarily mean a position where it is completely retracted from the workpiece.

After moving the cam driver 14 to the position shown in FIG. 4(c), the upper die 11 is raised to raise the cam driver 14. This causes the cam driver 14 to rise relative to the cam slider 15, and the cam slider 15 moves leftward in FIG. 4 along the inclined surfaces of each other. This causes the contact surface 14a2 of the cam driver 14 to contact the contact surface 15a2 of the cam slider 15 again, as shown in FIG. 4(d). During this process, the cam slider 15 moves leftward in FIG. 4 and is again positioned at the pressing position shown in FIG. 4(d). This causes the bending blade 15A to perform a second bending process on the processed portion W1.

Then, the cam driver 14 rises further and retreats from the cam slider 15 and the support slider 16 (see FIG. 1). Note that as the cam driver 14 rises and falls, the support slider 16 moves, so that in the position shown in FIG. 3 or FIG. 4(a)-(d) during bending, the second clamping part 16A abuts against the workpiece W from its underside, and in the position shown in FIG. 1 or FIG. 2 where the cam driver 14 has risen, the second clamping part 16A can be retreated from the workpiece W so as not to impede the rise of the first clamping part 13A.

As described above, in this embodiment, the cam slider 15 can be reciprocated in the order of pressing position → retreat position → pressing position by only one reciprocating movement of the upper die 11 downward and upward. Note that this "pressing position → retreat position → pressing position" order may include other positions in between. This allows the first bending of the processed part W1 by the bending blade 15A → springback due to the retreat of the bending blade 15A from the processed part W1 → second bending of the processed part W1 by the bending blade 15A to be performed. In this way, by generating springback after the first bending and performing the second bending, the amount of springback thereafter can be reduced and the processed part can be bent with high precision. In addition, the above process can be completed by only the reciprocating movement of the upper die 11. Therefore, bending can be performed with high precision without using multiple forming dies or performing two reciprocating movements with the same forming die. This allows the cost of the bending device to be reduced or the time required for bending to be shortened.

In this embodiment, the above bending process can be performed by the bending blade 15A by utilizing the up and down movement of the upper die 11, which is a press die.

Next, we will explain modified examples of the bending device 1.

In the above embodiment, for example, as shown in FIG. 4(c), the cam driver 14 and the cam slider 15 are in surface-to-surface contact. However, partial contact, such as point contact, may also be possible.

For example, the cam slider 15 shown in FIG. 5 has a contact roller 15B as a contact portion that contacts the cam driver 14. In this embodiment, as shown in FIGS. 6(a) to (c), the cam driver 14 descends, and the contact roller 15B moves relative to the first inclined surface portion 14a1, the contact surface portion 14a2, the second inclined surface portion 14a3, and the retreat surface portion 14a4 of the cam driver 14. As a result, the cam slider 15 moves from the pressing position in FIG. 6(b) to the retreat position in FIG. 6(c) as in the previous embodiment, and then the cam driver 14 rises, the contact roller 15B contacts the contact surface portion 14a2 again, and the cam slider 15 is again positioned at the pressing position. As a result, bending can be performed with high accuracy without making the same mold perform two reciprocating motions. Therefore, it is possible to reduce the cost of the bending device or shorten the bending time.

In the present embodiment, the contact roller 15B is in point contact with the cam driver 14, and the length of the surface portion on the cam driver 14 side, such as the contact surface portion 14a2, can be reduced compared to the above-mentioned embodiment, and the stroke of the cam driver 14, i.e., the upper die 11, required for bending can be reduced. In other words, in the above-mentioned embodiment, in the surface contact configuration, as shown in FIG. 7, for example, the cam slider 15 does not start moving to the right in FIG. 7 until the contact surface portion 15a2 of the cam slider 15 overcomes the contact surface portion 15a2 of the cam driver 14. As such, the stroke amount for moving the cam slider 15 becomes long. In contrast, in the present embodiment, the contact roller 15B is in point contact with the cam driver 14, and the contact roller 15B has good followability to each surface portion of the cam driver 14, and the stroke of the cam driver 14, i.e., the upper die 11, can be reduced. On the other hand, a configuration in which the cam driver 14 and the cam slider 15 are in surface contact as shown in FIG. 7 has the advantage that the force with which the cam driver 14 presses the cam slider 15 to the left in FIG. 7 can be increased. In this embodiment, the contact surface and the retraction surface are provided only on the cam driver 14 side. In this way, one side of the cam driver 14 or the cam slider 15 may have the contact surface and the retraction surface, and the other may partially have a contact portion that contacts the contact surface and the retraction surface. This contact portion is not limited to a roller portion such as the contact roller 15B, but may be, for example, a rectangular protrusion with chamfered corners.

The cam driver 14 shown in FIG. 8 has a third inclined surface portion 14a5 and a second abutment surface portion 14a6 in addition to the first inclined surface portion 14a1, the first abutment surface portion 14a2, the second inclined surface portion 14a3, and the retreat surface portion 14a4. The first abutment surface portion 14a2 is set back to the right of the cam slider 15 side in FIG. 8 from the second abutment surface portion 14a6. Specifically, based on the position X in the left-right direction in FIG. 8 of the second abutment surface portion 14a6, the first abutment surface portion 14a2 is positioned 5 mm to the right of position X, and the retreat surface portion 14a4 is positioned 15 mm to the right of position X.

In this embodiment, the contact portion of the cam slider 15 contacts the first contact surface 14a2, the retreat surface 14a4, and the second contact surface 14a6 in this order. As a result, the cam slider 15 moves in the order of the first pressing position, the retreat position, and the second pressing position by the bending blade 15A. In the first pressing position, the bending amount of the processed part W1 by the bending blade 15A is set to be small compared to the second pressing position and the final bending shape. In this way, in this embodiment, after performing preliminary bending with a small amount of bending, springback is generated and the second bending process can be performed to bend the part to the desired final bending shape.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the spirit of the present invention.

REFERENCE SIGNS LIST 1 bending device 11 upper die 12 lower die 13 pad 13A first clamping unit 14 cam driver (moving unit)
14a2 Contact surface portion 14a4 Retraction surface portion 15 Cam slider (bending portion)
15A bending blade (pressing part)
15a2: contact surface portion 15a4: retreat surface portion 16: support slider 16A: second clamping portion W: plate-shaped workpiece W1: processed portion of workpiece

Claims (1)

A clamping unit that clamps a plate-shaped workpiece with a processed portion on one end side of the workpiece exposed;
a bending unit that is provided so as to be capable of reciprocating between a pressing position where the processed portion is pressed and bent and a retreated position where the bending unit retreats from the pressing position in a direction opposite to a moving direction where the processed portion is bent;
a moving unit provided to be capable of reciprocating in a direction intersecting a reciprocating direction of the bending unit, and causing the bending unit to reciprocate;
A bending apparatus for bending the workpiece in a thickness direction of the workpiece,
At least one of the moving portion and the bending portion has a contact surface portion that contacts the other of the moving portion or the bending portion to move the bending portion to the pressing position, and a retreat surface portion that is retreated from the other of the moving portion or the bending portion relative to the contact surface portion in a moving direction of the moving portion,
The bending apparatus according to claim 1, wherein the bending unit reciprocates between the pressing position, the retreated position, and the pressing position in this order by the reciprocating movement of the moving unit.

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