JP3141207U - Die for press bending - Google Patents

Abstract

[PROBLEMS] To provide a die for press bending which can prevent a decrease in strength of a bent portion and can greatly improve the product value by improving the strength of the bent portion.
A die 20 that receives a metal member from the opening side, and a receiving die 24 that is provided in the die 20 and is housed in the opening of the metal member 40 and formed into a shape after the metal member 40 is bent. And a bending blade 30 for moving in the longitudinal direction while rotating along the shape of the metal member 40 after bending, the bending blade 30 for bending the metal member 40, and the bending member 30. A small-diameter roller portion 34 that bends the bottom plate portion 42 along the shape after bending, and provided on both sides of the small-diameter roller portion 34, and sandwiches both side plate portions 44, 44 of the metal member 40 together with the receiving die 24. And a bending roller portion 36 that bends both side plate portions 44 and 44 along the shape of the metal member 40 after bending.
[Selection] Figure 2

Description

  In the present invention, a vertically long metal member having a bottom plate portion and side plate portions continuous on both sides of the bottom plate portion is bent in advance into a U-shaped cross-sectional shape. This relates to a mold for press bending.

  Conventionally, in this type of press bending mold, the plate-shaped workpiece is set on the horizontal upper surface of the lower mold body, and the upper mold is lowered, so that the plate-shaped workpiece is clamped by pushing the plate retainer downward via the spring. ing. At the same time, the vertical machining surface advances while the roller follows the inclined surface and descends, and further follows the vertical surface via the flange portion to perform L bending of the flange portion. When the upper die is further lowered, the roller is moved following the inclined surface, and the inner bending surface comes into contact with the inner bending surface through the free end portion of the flange portion bent in the vertical direction. The plate-like workpiece was bent by descending (see Patent Document 1).

By the way, as shown in FIG. 10, when the vertically long metal member 40 previously bent in a U-shaped cross section is bent in the direction of the opening side 46 (downward in the drawing) (bent in an L shape), It was bent using a general press bending mold. However, when the metal member 40 is bent into an L shape once (once) using a general press bending mold, it is large on the inner side of the bending of both side plate portions 44 (one side not shown). Deformation occurs and it cannot be used as a product. Therefore, the bending of the metal member 40 is divided into several times, and at first, the metal member 40 is bent gradually from a small angle to a large angle (L-shaped angle). When the metal member 40 is gradually bent into an L shape, no wrinkles are generated in the bottom plate portion 42, but wrinkles are inevitably generated in the bent portions 48 of the side plate portions 44, 44.
JP 2001-246418 A

  When a vertically long metal member bent in advance in a U-shaped cross-section is bent into an L-shape on the side of the U-shaped opening by using a general press-bending die as described above, the bent portion is inevitably formed. Since wrinkles are generated, there is a problem in that stress distribution occurs in the bent portion, and the strength of the bent portion is significantly reduced.

  In addition, when the metal member is bent, if wrinkles occur on both side plate portions, there is a problem that the product value is deteriorated and the commercial value is lowered.

  The present invention has been made to solve the problems of the related art, and prevents a decrease in strength of the bent portion of the metal member, and improves the value of the product by significantly improving the value of the tool. An object of the present invention is to provide a press bending mold that can be used.

  That is, the press bending die of the present invention is bent in advance in a U-shaped cross section, and a vertically long metal member having a bottom plate portion and side plate portions that are continuous on both sides of the bottom plate portion is formed into a rectangular shape. A die for bending to the opening side of the character, a die for receiving the metal member from the opening side, a shape provided on the die and housed in the opening of the metal member, and a shape after bending of the metal member A receiving die formed on the metal member, a bending blade that moves in the longitudinal direction while rotating along the shape of the metal member after bending, and a bending member for bending the metal member, the metal member provided on the bending blade A small-diameter roller part that bends the bottom plate part along the shape after bending, and provided on both sides of the small-diameter roller part, sandwiching both side plate parts of the metal member with the receiving mold, and after bending the metal member A folding roller part that bends both side plate parts along the shape of And features.

  According to the present invention, a vertically long metal member having a bottom plate portion and side plate portions continuous on both sides of the bottom plate portion is bent in a U-shaped opening side. A die for press bending for forming a die, which receives a metal member from the opening side, and is provided in the die and accommodated in the opening of the metal member, and formed into a shape after bending the metal member A receiving blade, a bending blade that moves in the longitudinal direction while rotating along the shape of the metal member after bending, a bending blade for bending the metal member, and a bending blade provided on the bending blade. A small-diameter roller part that bends the bottom plate part along the shape after processing, and a shape that is provided on both sides of the small-diameter roller part, sandwiches both side plate parts of the metal member with the receiving mold, and the shape after bending the metal member And a folding roller part that bends both side plate parts along the Without wrinkles in the bent portion of the wood, it can be bent the metal member. Thereby, since the stress dispersion | distribution of a bending part is lose | eliminated, the intensity | strength of the bending part of the metal member bent by the cross-sectional U-shape can be increased significantly. In addition, the generation of wrinkles in the bent portion is eliminated, and the value of the product is greatly improved because the kure is improved by looking at the bent portion. Therefore, the convenience of the press bending die can be greatly improved.

  In the present invention, when a vertically long metal member bent in advance in a U-shaped cross section is bent toward the U-shaped opening side, the strength of the bent portion is prevented from being significantly reduced, The main feature is to prevent the product value from deteriorating due to the wrinkles at the time of bending and the deterioration of the merchandise. The purpose of preventing the strength of the bent portion from decreasing and improving the product value by looking at the sharpness is formed in the shape after bending the metal member, and the both side plates of the metal member are Receiving from the inside and moving in the longitudinal direction while rotating along the shape of the metal member after bending, receiving both side plates of the metal member from the outside, and along the shape of the metal member after bending This is realized by including a bending roller portion that bends the metal member.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of a press bending die 10 (including an upper die body 50 and a lower die body 22) of a press according to an embodiment of the present invention, and FIG. 2 is a press bend illustrating an embodiment of the present invention. FIG. 3 is an enlarged view of a main part of the processing die 10, and FIG. 3 shows a bending blade 30 constituting the press bending processing die 10 according to an embodiment of the present invention (including a part of components of the upper die main body 50 of the press). FIG. 4 is a perspective view of a metal member 40 that is bent by a press bending die 10 according to an embodiment of the present invention, and FIG. 5 is a press bend illustrating an embodiment of the present invention. The conceptual diagram which shows the state which is bending the metal member 40 in the metal mold | die 10 for a process is each shown. In addition, in each figure, what is shown with the same code | symbol as FIG. 10 is the same.

  The press bending die 10 in this embodiment includes a bottom plate portion 42 and side plate portions 44 and 44 formed continuously on both sides of the bottom plate portion 42, and is a vertically long shape that is bent in a U-shaped cross section in advance. The metal member 40 (shown in FIG. 4) is bent into an L shape or a square shape. As shown in FIGS. 1, 2, and 3, the press bending die 10 includes a die 20 that receives a metal member 40 from an opening side 46 (side plate portions 44 and 44 side of the bottom plate portion 42), and a metal member. The receiving die 24 formed in the shape after bending 40 and the bending blade 30 for moving in the longitudinal direction while rotating along the shape after bending the metal member 40 and bending the metal member 40. It consists of and. The metal member 40 is formed of a plate material such as iron, aluminum, or stainless steel having a U-shaped cross section. Further, the bending of the metal member 40 is not limited to the L shape or the square shape, and may be a curved shape.

  The die 20 is composed of a lower mold body 22 and a receiving mold 24 provided so as to protrude from the lower mold body 22. The receiving mold 24 is formed into a shape after the bending process of the metal member 40 (for example, an L shape, a square shape, or a predetermined curved shape as shown in FIG. The metal member 40 bent in a letter shape is formed in a shape that can be inserted between both side plate portions 44, 44 without any substantial gap and can be easily attached and detached. Hereinafter, an L shape, a square shape, or a predetermined curved shape is referred to as a processed shape.

  The bending blade 30 includes a cylindrical or cylindrical small-diameter roller portion 34 that bends the metal member 40 into a processed shape, and disk-like bending roller portions 36 provided on both sides of the small-diameter roller portion 34. , 36. The folding roller portions 36 and 36 are formed by a roller having a larger diameter than the small diameter roller portion 34, and the bending roller portions 36 and 36 are continuously provided on both sides of the small diameter roller portion 34. . In addition, a predetermined curved surface 34A (a rounded surface) is formed at the intersection of the small diameter roller portion 34 and the bending roller portions 36, 36.

  The small-diameter roller portion 34 is in contact with the bottom plate portion 42 when the metal member 40 is bent, and the bending roller portions 36 and 36 are in contact with both side plate portions 44 and 44 when the metal member 40 is bent. Has been. Specifically, the small-diameter roller portion 34 is configured such that a metal member 40 having a U-shaped cross section is brought into contact with the bottom plate portion 42 when bent, so that the bottom plate portion 42 can be clamped with the upper surface of the receiving die 24. . In addition, the center of the small diameter roller part 34, the bending roller parts 36 and 36, and the rotating shaft 30A mentioned later is provided on the same axis.

  Further, the bending roller portions 36 and 36 are configured to abut against the side plate portions 44 and 44 when the metal member 40 is bent and to be sandwiched between the side plate portions 44 and 44 by the side surfaces of the receiving die 24. Yes. That is, the bending blade 30 is provided on both sides of the small-diameter roller portion 34 and the small-diameter roller portion 34 that bends the bottom plate portion 42 into a predetermined shape after the metal member 40 is bent. In addition, both side plate portions 44 and 44 of the metal member 40 are provided with bending roller portions 36 and 36 that sandwich the receiving mold 24.

  Although not shown, the bending blade 30 is held by an upper mold main body 50 that is attached to a press and moves up and down, and is held movably in the longitudinal direction of the metal member 40 (FIG. 1). In other words, the bending blade 30 is provided with a rotary shaft 30A, and the rotary shaft 30A is rotatably held at the lower end of the support arm 52 extending in the vertical direction. The support arm 52 is connected and fixed to a roll cam slider 54, and the roll cam slider 54 is connected to a gas spring 58 (air cylinder) via a cam thrust angle 56 (in the left-right direction in FIG. 1). .

  The cam thrust angle 56 is inclined by a predetermined angle (in FIG. 1, the right side is inclined upward with respect to the left side), and the bending blade 30 (roll cam slider 54) It is configured to move in the left-right direction along the inclination. Reference numeral 60 denotes a cam backup 60 which contacts the bending blade 30 (small-diameter roller portion 34) at the final stage of bending of the metal member 40, and the bending blade 30 is not separated from the metal member 40 by the stress of the metal member 40. It is provided as follows. Further, 62 is a recess carved into a predetermined position in the lower die body 22, and the lower side surface of the cam backup 60 abuts against the side wall 62A of the recess 62, and the cam backup 60 moves further. Positioning.

  That is, in the bending blade 30, when the upper die body 50 of the press is lowered (dotted line in the figure), the small-diameter roller portion 34 comes into contact with the bottom plate portion 42 of the metal member 40 as shown in FIG. 5. As a result, the metal member 40 is sandwiched between the upper surface of the receiving mold 24 and the small-diameter roller portion 34 and is also sandwiched between the side surface of the receiving mold 24 and the folding roller portions 36 and 36. At this time, the gas spring 58 operates simultaneously with the upper die body 50 coming into contact with the metal member 40 to move the bending blade 30 toward the cam backup 60. That is, the bending blade 30 moves in the direction of the cam backup 60 by the operation of the gas spring 58 while being lowered by the lowering of the upper mold body 50.

  In this case, the bending blade 30 moves along the upper surface of the receiving mold 24 (after the metal member 40 is bent) by the lowering speed of the upper mold body 50 and the moving speed of the roll cam slider 54 that moves the inclination of the cam thrust angle 56. (Along the shape of), it moves to an approximately L shape while drawing an arc at the corner (solid arrow in the figure). By the operation of the bending blade 30, the metal member 40 is configured to be bent into a substantially L shape as indicated by a dotted line and a dotted arrow in the figure.

  Next, a specific example in which the metal member 40 is bent will be described with reference to FIGS. The metal member 40 is bent in advance in a U-shaped cross section, and is installed with the bottom plate portion 42 on the receiving die 24 and the side plate portions 44 and 44 positioned on the side surfaces of the receiving die 24. To do. The press bending die 10 is used for bending a metal member (metal member 40) when manufacturing a foot that supports a main body of a fuel tank (not shown). Further, since the technique for bending a metal by a press is a well-known technique, a detailed description thereof will be omitted.

  First, when the upper die body 50 is lowered by the press (dotted line in the figure), the bending blade 30 is lowered as shown by an arrow in FIG. When the bending blade 30 is lowered, the metal member 40 is installed on the receiving die 24 below the bending blade 30 as shown in FIG. 7, so that the small-diameter roller portion 34 of the bending blade 30 is the bottom plate portion 42 of the metal member 40. The folding roller portions 36, 36 are in contact with the outer side of both side plate portions 44, 44 of the metal member 40 having a U-shaped cross section. The small-diameter roller portion 34 of the bending blade 30 contacts the bottom plate portion 42 of the metal member 40, and the bending roller portions 36 and 36 contact the outside of both side plate portions 44 and 44 of the metal member 40 having a U-shaped cross section. This state is hereinafter referred to as the bending blade 30 coming into contact with the metal member 40.

  At the same time that the bending blade 30 comes into contact with the metal member 40, the gas spring 58 operates to move the bending blade 30 in the cam backup 60 direction (solid arrow direction in FIG. 7). At the same time as the bending blade 30 comes into contact with the bottom plate portion 42 of the metal member 40, the gas spring 58 operates to move the bending blade 30 in the cam backup 60 direction (solid arrow direction in the figure).

  That is, since the gas spring 58 moves the bending blade 30 toward the cam backup 60 while the upper die main body 50 continues to descend, the bending blade 30 as described above has a shape after bending the metal member 40. It goes down along. At this time, as shown in FIG. 8, since the bending blade 30 (small-diameter roller portion 34) is in contact with the metal member 40 (bottom plate portion 42), the frictional force causes the rotating shaft 30A to be the center in the cam backup 60 direction. While moving while rotating, the metal member 40 is bent toward the opening side 46. In this way, the both side plate portions 44, 44 of the metal member 40 are sandwiched between the both sides of the receiving mold 24 provided so as to protrude on the lower mold main body 22 and the bending roller portion 36. When bending into an L shape, it is possible to prevent inconveniences such as wrinkles occurring in the bent portion 48 (shown in FIG. 4).

  When the upper die body 50 is further lowered, the lower end of the cam backup 60 enters the recess 62 and is positioned by the side wall 62A. It contacts the cam backup 60. In this state, the bending blade 30 is further prevented from moving in the cam backup 60 direction, and in this state, the bending blade 30 moves downward to the bottom dead center of the press stroke.

  When the press descends to the bottom dead center of the stroke, it rises this time, and after this, the bending blade 30 and the cam backup 60 also rise, and then the bending blade 30 folds the metal member 40 by the gas spring 58. It returns to the position before bending (the side away from the cam backup 60). As a result, the bending of the metal member 40 is completed, and the metal member 40 is finished in the shape of the receiving die 24 (the shape after bending) (the bending of the foot supporting the fuel tank body is completed). In addition, the foot that has been bent is finished by smoothly finishing the edge portion, washing and removing the oil, and then sequentially performing rust prevention and surface coating.

  As described above, the vertically long metal member 40 bent in a U-shaped cross section in advance is received from the opening side 46, and the die 20 is provided in the die 20 and is stored in the opening of the metal member 40, and the metal A receiving die 24 formed into a shape after bending the member 40, and a bending blade for bending the metal member 40 by moving in the longitudinal direction while rotating along the shape after bending the metal member 40 30, a small-diameter roller portion 34 that is provided on the bending blade 30 and bends the bottom plate portion 42 along the shape of the metal member 40 after bending, and is provided on both sides of the small-diameter roller portion 34. Both side plate portions 44, 44 are sandwiched together with the receiving die 24, and bending roller portions 36, 36 are provided for bending the side plate portions 44, 44 along the shape of the metal member 40 after bending. The wrinkled portion 48 of the metal member 40 is wrinkled. Without entering, it can be bent the metal member 40 in a suitable condition.

  Thereby, since wrinkles do not enter into the bent portion 48 of the metal member 40, the stress distribution of the bent portion 48 is eliminated, and the strength of the bent portion bent in a U-shaped cross section can be greatly increased. Further, the generation of wrinkles in the bent portion 48 is eliminated, and the value of the bent portion 48 is improved, so that the commercial value can be greatly improved. Therefore, the convenience of the press bending die 10 can be greatly improved.

  In the embodiment, the cam backup 60 is provided in the upper die main body 50 and the recess 62 carved in the lower die main body 22 is provided, and the lower end of the cam backup 60 enters the recess 62 so that the bending blade Although the positioning of the bending blade 30 is not limited to this, the cam backup 60 and the recess 62 are not provided, and a part of the lower die main body 22 protrudes toward the upper die main body 50 side. The present invention is effective even if a wall is provided and the bending blade 30 (small diameter roller portion 34) is brought into contact with the receiving wall to position the bending blade 30. In this case, it is necessary to perform relief processing so that the upper mold body 50 does not hit the receiving wall. Thereby, it is not necessary to consider the mounting accuracy of the cam backup 60, and the usability of the press bending die 10 can be greatly improved.

  Further, in the press bending mold 10, the fuel tank leg was bent with the vertically long metal member 40 bent in advance in a U-shaped cross section, but what is bent is not limited to the fuel tank leg, The present invention is also effective when used for bending a foot for supporting a hot water storage tank, a vehicle bumper, a vehicle frame or a reinforcing member.

  Further, in the embodiment, the shape and position of the press bending mold 10 have been described. However, the shape and position of each component may be changed without departing from the gist of the press bending mold 10. Needless to say. Of course, the present invention is not limited to the above-described embodiments, and the present invention is effective even if various other changes are made without departing from the spirit of the present invention.

1 is a front view of a press bending die (including an upper die body and a lower die body) of a press according to an embodiment of the present invention. It is a principal part enlarged view of the metal mold | die for press bending which shows one Example of this invention. 1 is a front view of a bending blade (including part of components of an upper die main body of a press) that constitutes a press bending mold according to an embodiment of the present invention. It is a perspective view of the metal member which performed the bending process with the metal mold | die for press bending which shows one Example of this invention. It is a conceptual diagram which shows the state which is bending the metal member with the metal mold | die for press bending which shows one Example of this invention. It is a figure which shows the state which is bending the metal member in the metal mold | die for press bending (an upper mold main body and a lower mold main body are included) which shows one Example of this invention. It is a figure which shows the state which is bending the metal member in the metal mold | die for press bending (an upper mold main body and a lower mold main body are included) which shows one Example of this invention. It is a figure which shows the state which is bending the metal member in the metal mold | die for press bending (an upper mold main body and a lower mold main body are included) which shows one Example of this invention. It is a figure which shows the state which is bending the metal member in the metal mold | die for press bending (an upper mold main body and a lower mold main body are included) which shows one Example of this invention. It is a perspective view of the metal member of the state which performed the bending process with the conventional metal mold | die for press bending processes.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mold for press bending 20 Dies 22 Lower die main body 24 Receiving die 30 Bending blade 34 Small diameter roller part 36 Bending roller part 40 Metal member 42 Bottom plate part 44 Side plate part 46 Opening side 48 Bending part 50 Upper mold body

Claims (1)

Press bending for bending a vertically long metal member, which is previously bent into a U-shaped cross section and has a bottom plate portion and side plate portions continuous on both sides of the bottom plate portion, to the opening side of the U-shape. A mold for processing,
A die for receiving the metal member from the opening side;
A receiving die provided on the die, housed in the opening of the metal member, and formed into a shape after bending of the metal member;
A bending blade for bending the metal member, moving in the longitudinal direction while rotating along the shape after bending of the metal member,
A small-diameter roller portion that is provided on the bending blade and bends the bottom plate portion along the shape after bending of the metal member;
Bending roller portions that are provided on both sides of the small-diameter roller portion, sandwich both side plate portions of the metal member together with the receiving mold, and bend the both side plate portions along the shape after bending of the metal member. And a press bending mold.

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