JP2010142836A - Plate bending device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plate bending device wherein rubbed marks are hardly generated on a plate material after bending work. <P>SOLUTION: This plate bending device is provided with: a die 2 where a bending die surface 1 of the plate material A is formed; a pressing member 4 where a pressing surface 3 for pressing the plate material A against the bending die surface 1 is formed; a pressurizing mechanism for pressing the pressing surface 3 toward the bending die surface 1; and a guide mechanism for guiding the moving direction of the pressing member 4 so that the pressing surface 3 is tilted toward the bending die surface 1 with pressing places Q1, Q2, Q3 to the plate material as a supporting point, when pressing the pressing surface 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention includes a die formed with a bending die surface of a plate material, a pressing member formed with a pressing surface that presses the plate material against the bending die surface, and a pressing mechanism that presses the pressing surface toward the bending die surface. The present invention relates to a plate bending apparatus.

  In the above plate bending apparatus, conventionally, a punch as a pressing member in which a metal plate material such as a steel plate is placed on a die formed with a bending die surface, and a pressing surface similar in shape to the bending die surface is formed on the metal plate material. Is pressed from one direction so that the plate material can be bent (see, for example, Patent Document 1).

JP 2003-266122 A (paragraph [0010], [FIG. 1])

In the conventional plate bending apparatus described above, the punch is bent from one direction against the plate placed on the die, so that the plate slides against the die or the punch during the pressing, and as a result, the plate is bent into the plate after bending. There is a drawback that scratch marks are easily generated by a punch or a punch, and the appearance quality of the plate material after bending is easily deteriorated.
Furthermore, there is a drawback that it is difficult to obtain a desired bent shape due to a phenomenon (spring back) in which elastic strain generated in the plate material is recovered.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a plate bending apparatus in which a scratch mark is hardly generated on a plate material after bending and a desired bending shape can be obtained.

  A first characteristic configuration of the present invention includes a die formed with a bending die surface of a plate material, a pressing member formed with a pressing surface that presses the plate material against the bending die surface, and the pressing surface facing the bending die surface. A pressing mechanism that presses the pressing surface, and a guide mechanism that guides the moving direction of the pressing member so that the pressing surface tilts toward the bending mold surface with a pressing position against the plate material as a fulcrum when pressing the pressing surface. It is in the point equipped with.

[Action and effect]
In the case of the plate bending apparatus of this configuration, when the pressing surface is pressed toward the bending die surface, the moving direction of the pressing member is tilted toward the bending die surface with the pressing surface serving as a fulcrum for the pressing portion against the plate material. Guided.
Therefore, it is possible to bend the plate material while tracing the plate material on the bending mold surface without sliding the plate material against the die or the pressing member.

  According to a second characteristic configuration of the present invention, the bending die surface is an arc surface, the pressing surface is a flat surface, and the guide mechanism has a locus of a pressing portion of the pressing surface with respect to the plate material, When viewed in a direction along the central axis, the involute curve is formed with respect to the plate portion bent along the arc surface.

[Action and effect]
With this configuration, the locus of the pressing member with respect to the plate member of the pressing surface is an involute curve with respect to the plate member portion bent along the arc surface in a direction view along the center axis of the arc surface. The direction of movement is guided.
Therefore, while moving the pressing member with a desired pressing stroke, the pressing surface can be tilted toward the bending die surface with the pressing portion against the plate material as a fulcrum, and the plate material can be bent while accurately tracing the bending die surface. it can.
Further, by adjusting the pressing stroke, it is easy to perform a bending process in consideration of a phenomenon (spring back) in which the elastic strain generated inside the plate material is recovered.

  According to a third characteristic configuration of the present invention, the guide mechanism includes a guide roller provided in the pressing member and a guide groove for guiding the guide roller.

[Action and effect]
If it is this structure, the attitude | position change of a press member will become very smooth, and it can guide with sufficient repeatability.

Embodiments of the present invention will be described below with reference to the drawings.
1 and 2 show a plate bending apparatus for a steel plate (an example of a plate material) A according to the present invention.
The plate bending apparatus includes a die 2 on which a bending die surface 1 of a steel plate A is formed, a punch 4 (an example of a pressing member) 4 on which a pressing surface 3 that presses the steel plate A against the bending die surface 1 is formed, and a punch 4 is pushed down. A pressing mechanism 5 that presses the pressing surface 3 toward the bending die surface 1 and a guide mechanism 6 that guides the moving direction of the punch 4 when pressing the pressing surface 3 toward the bending die surface 1.

  The die 2 includes a flat placement surface 7 along the horizontal direction on which the steel plate A is placed, a flat side surface 8 along the direction intersecting the placement surface 7, and the placement surface 7 and the side surface 8. And a bending die surface 1 formed at an intersecting corner (protruding corner).

  The bending die surface 1 is formed by an arc surface having a radius of about several millimeters, and each of the placement surface 7 and the side surface 8 is continuous from the tangential direction with respect to the bending die surface (arc surface) 1.

  A thick clamp plate 10 having a flat rectangular clamp surface 9 along the horizontal direction is not shown above the die 2 in order to hold the steel plate A placed on the placement surface 7 so as not to move. It is fixed to the device frame.

  The die 2 is provided so that it can be moved up and down by a hydraulic device (not shown) in the perspective direction with respect to the clamp surface 9 while holding the mounting surface 7 in parallel with the clamp surface 9.

  The punch 4 includes a pressed surface 11 that is pressed downward by the pressurizing mechanism 5 and a pressing surface 3. The pressed surface 11 is formed as an arc surface that can be easily processed. Is formed in a flat rectangular plane.

  As shown in FIG. 3, the clamp plate 10 is in a state where the edge P <b> 1 of the clamp surface 9 on the side of the bending die surface 1 sandwiches the steel plate A between the mounting surface 7 and the clamp surface 9. The bending mold surface 1 is fixed so as to enter the placement surface 7 side slightly (about 0.5 to 1.0 mm in the present embodiment) from the bending start position P2.

The guide mechanism 6 includes three guide rollers 12 (12a, 12b, 12c) provided on the left and right side surfaces of the punch 4 and three guide grooves 13 (13a, 13b, 13) for guiding the guide rollers 12 separately. 13c) and left and right guide blocks 14 are provided.
The guide block 14 is positioned on both the left and right sides of the punch 4 and is fixed to a device base (not shown).

  A tension spring 15 is mounted across the punch 4 and a device frame (not shown), and the punch 4 waiting at a standby position where no bending operation is performed is caused by the urging force of the tension spring 15 as shown in FIG. In addition, each guide roller 12 is in contact with the upper end portion of the guide groove 13, and the pressing surface 3 is held in a posture that is flush with the clamp surface 9.

The pressurizing mechanism 5 is composed of a general-purpose press equipped with a punch 16 that can be moved up and down by a hydraulic device or the like.
The punch 16 has substantially the same width as the punch 4. By lowering the punch 16, the pressed surface 11 is pressed downward, and the punch 4 is pushed down while rotating along the guide groove 13 against the urging force of the tension spring 15. 3 is pressed toward the bending mold surface 1 with the steel plate A interposed therebetween.

  When the punch 4 is pushed down, the guide roller 12a closer to the bending die surface 1 of the three guide rollers 12 is pressed against the guide surface 19a closer to the bending die surface 1 of the guide groove 13a. The remaining guide rollers 12b and 12c roll while being pressed against the guide surfaces 19b and c on the side farther from the bending die surface 1 of the guide grooves 13b and 13c.

Therefore, since the punch 4 is rotated in a state of stretching in the rotational radial direction by the three guide rollers 12 with respect to each of the guide blocks 14, the rotational posture is stabilized.
The number of guide grooves 13 may be four or more if possible.

  A groove 17 that allows the lower portion of the punch 16 to enter is formed in the punch 4 so that the punch 4 and the punch 16 do not interfere with each other as the punch 4 is pushed down along the guide groove 13.

  The pressing portion of the punch 16 against the surface 11 to be pressed is constituted by, for example, a pressing roller having a length substantially the same as the lateral width of the punch 4, and the pressing roller is arranged below the punch 16 with the rotation axis of the guide roller 12. It may be supported so as to be freely rotatable around a parallel axis.

  As shown in FIG. 3, the three guide grooves 13 are formed by arcuate surfaces 1 whose movement trajectories of the pressing locations Q1, Q2, Q3,... Are formed so as to have involute curves R1, R2, R3,... With respect to the plate material portion 18 bent along the bending die surface (arc surface) 1.

  Therefore, as the punch 4 is pushed down, the moving direction of the punch 4 is guided so that the pressing surface 3 tilts toward the bending die surface 1 with the pressing points Q1, Q2, Q3,. Is done.

The bending operation of the steel plate A by the plate bending apparatus will be described.
As shown in FIG. 4, the punch 4 is placed at the standby position, and the die 2 is lowered to place the steel plate A on the placement surface 7.

Next, by raising the die 2, as shown in FIG. 5, the steel plate A is sandwiched between the mounting surface 7 and the clamp surface 9 and gripped so as not to move.
In this state, the edge P3 on the clamp plate 10 side of the pressing surface 3 of the punch 4 is intermediate between the edge P1 on the bending die surface 1 side of the clamping surface 9 and the bending start position P2 of the bending die surface 1. Is located.

  Next, by lowering the punch 16 and pressing the pressed surface 11, as shown in FIG. 6, a predetermined pressing stroke (in this embodiment, the steel plate A is pressed against the side surface 8 of the die 2 and the pressing surface of the punch 4. 3), the punch 4 is pushed down along the guide groove 13 against the urging force of the tension spring 15.

  Along with the operation of pushing down the punch 4, the steel plate A can be bent while tracing the bending die surface (arc surface) 1 without sliding the steel plate A with respect to the die 2 or the punch 4.

  Next, when the punch 16 is raised, the punch 4 is pulled up along the guide groove 13 by the urging force of the tension spring 15 and moved to the standby position, and the die 2 is lowered and bent as shown in FIG. The processed steel sheet A is taken out.

[Other Embodiments]
1. In the plate bending apparatus according to the present invention, a bending die surface whose cross-sectional shape becomes a part of an ellipse and a bending die surface whose cross-sectional shape becomes a part of a polygon may be formed on the die.
2. The plate bending apparatus according to the present invention may include a die in which a bending die surface is formed at a corner (protruding corner) where two planes intersect at a right angle or an obtuse angle.
3. In the plate bending apparatus according to the present invention, a pressing surface made of a curved surface may be formed on the pressing member.
4). The plate bending apparatus according to the present invention may be for bending various metal plate materials other than steel plates.

Side cross-sectional view of plate bending device Front sectional view of plate bending machine Enlarged side view of the main part Illustration of bending motion Illustration of bending motion Illustration of bending motion Illustration of bending motion

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bending die surface 2 Dies 3 Pressing surface 4 Pressing member 5 Pressing mechanism 6 Guide mechanism 12 Guide roller 13 Guide groove 18 Plate material part A Plate material Q1, Q2, Q3 Press location R1, R2, R3 Involute curve X Center axis

Claims (3)

A die on which a bending die surface of the plate material is formed;
A pressing member formed with a pressing surface for pressing the plate material against the bending mold surface;
A pressure mechanism for pressing the pressing surface toward the bending mold surface;
A plate bending provided with a guide mechanism that guides the moving direction of the pressing member when the pressing surface is pressed so that the pressing surface tilts toward the bending mold surface with a pressing portion against the plate material as a fulcrum. apparatus. The bending mold surface is an arc surface, and the pressing surface is a plane,
The guide mechanism is such that the locus of the pressing portion of the pressing surface with respect to the plate material becomes an involute curve with respect to the plate material portion bent along the arc surface in a direction view along the central axis of the arc surface. The plate bending apparatus according to claim 1, which is configured.   The plate bending apparatus according to claim 2, wherein the guide mechanism includes a guide roller provided on the pressing member and a guide groove for guiding the guide roller.

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