JP2005262272A - Method and press device for working u-bent member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a U-bent member having a single flange in one press working with high productivity by devising the shape of a die and a punch. <P>SOLUTION: A metal plate S to be worked is placed on a lower die 11 in which two rotary dies 12 of a substantially L-shaped section while intersection lines of sectional centers of two L-shaped walls as supporting points are arranged in an energizing manner so that L-shaped open inner sides face each other and upper ends of the L-shape are outwardly rotated from each other. A punch 18 having a stepped part 19 on one side face or both side faces is pressed into a recessed part of the lower die 11 formed of the substantially L-shaped rotary die 12 from an upper part of the metal plate to start the U-bend working. On and after the time when the pressure of the punch 18 reaches an upper face of a bottom wall 14 of the substantially L-shaped rotary die 12 via the metal plate S, the U-bend side is bent at a substantially right angle by changing the pressure downward of the punch to the pressure inward of a substantially L-shaped rotary die longitudinal wall 13, and one side of the U-bend side or upper ends of both sides are flange-bent by the action of the stepped part 19 provided on the upper face of the rotary die 12 and the side face of the punch. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method of manufacturing a U-bending member having one flange or both flanges by pressing, and a press apparatus used in the method.

In many cases, U-bending members are used as various frame materials.
In general, in manufacturing a U-bending member, a press bending method is frequently used because the apparatus configuration is simple and the operation is easily simplified. For example, a multi-step bending process is performed by a press brake or the like as disclosed in Patent Document 1. Further, for example, as seen in Patent Document 2, a metal plate 2 to be formed is placed on a die 1 having a pad 4 (FIG. 1a), and a punch 3 is pushed in from above to form a desired U-bending member 5 (FIG. 1b).
In recent years, depending on the application, for example, a long U-bending member having one flange or both flanges as shown in FIG. 2 is required.

Japanese Patent Laid-Open No. 7-60360 Japanese Patent Laid-Open No. 7-80550

If a U-bending member having a single flange is to be manufactured by the press bending method, the bending process by the press brake is repeated three times. Moreover, when it is going to manufacture the U bending member which has both flanges with a press bending method, the bending process by a press brake will be repeated 4 times. Further, as shown in FIG. 3, for example, both bent materials once bent by a press brake are placed on the die D at both ends of the metal plate S and pressed with a punch P to form a U bent portion. It will be.
In the processing method in which the bending process is repeated three times with the press brake, the bending direction of the single flange and the U-bending portion is reversed, and thus it is necessary to reverse the material metal plate. At this time, a long U-bending member requires a wide range of reversal space and is extremely difficult for the operator.

On the other hand, in the method of once bending the metal end and then U-bending, two types of molds are required because the same mold cannot be used. In this case, two press brakes are required, and a storage space for work in progress is also required. Moreover, when exchanging a metal mold | die with one press brake, a great effort will be spent on exchange work and adjustment.
For this reason, the manufacturing cost increases regardless of which of the conventional methods is employed.
The present invention has been devised to solve such problems, and by devising the shape of the die and punch, a U-bending member having one or both flanges can be produced by only one press working. It aims at manufacturing with good performance.

  In order to achieve the object, the method for processing a U-bending member having one flange or both flanges according to the present invention has a substantially L-shaped cross section and a line intersecting the cross-sectional center of the L-shaped two walls as a fulcrum. Two substantially L-shaped cross-section rotating dies are processed on a lower mold that is arranged so that the open inner sides of the L-shapes face each other and the upper ends of the L-shapes are rotated outward with respect to each other. Place a metal plate and push a punch having a step on one or both sides into the lower mold recess formed by the substantially L-shaped rotating die from above the workpiece metal plate to perform U-bending. At the same time, after the punch pressing force reaches the upper surface of the bottom wall of the substantially L-shaped cross-section rotating die via the metal plate, the downward pressing force of the punch is applied to the vertical wall of the substantially L-shaped cross-sectional rotating die. Changing the applied pressure in the inner direction to substantially right-angle bending of the U-bending side, the upper surface of the rotating die and the punch And performing bending flanges of one side or both sides the upper end of the U bent sides by the action of the step portion provided on the surface.

In addition, U bending may be started while supporting a metal plate with a cushion pad biased upward in a lower mold recess formed by two substantially L-shaped rotating dies.
Instead of a punch having a step on the side, a main punch with flat sides and an auxiliary punch arranged on one or both sides of the main punch are used. May be performed.

The press device used in this method has a vertical wall with an R at the upper end and a bottom wall open on the side, and a line at which the vertical wall cross-sectional center intersects with the bottom wall cross-sectional center is a fulcrum. Lower die composed of two substantially L-shaped cross-section rotating dies that are urged so that the upper end is rotated outward and face the open side, and the inner end tip width of the desired U-bending member It is preferable to have a punch having a flat surface width at the tip and having a step portion extending outwardly from one side surface or both side surfaces.
You may arrange | position the cushion pad connected via the connecting rod on the urging | biasing apparatus in the recessed part of the lower metal mold | die comprised by two substantially L-shaped cross-section rotation die | dyes.

It is preferable that the vertical wall inner surface and the bottom wall upper surface of the substantially L-shaped cross-section rotating die are set so that the intersecting angle is less than 90 degrees.
When performing the flange bending in the second aspect, the punch includes a straight punch having a flat front end with a width slightly narrower than the cushion pad width, and one or both sides of the straight punch separately from the straight punch. It can also be constituted by a double punch made up of auxiliary punches arranged on the surface.

In the present invention, each has a substantially L-shaped cross section having a vertical wall having an R at its upper end and a bottom wall 4 having an open side, and has a vertical wall cross-sectional center and a bottom wall cross-sectional center. The lower mold is composed of two substantially L-shaped cross-section rotating dies that are urged so that the upper end is rotated outward with the line intersecting as the fulcrum, and the open sides face each other. ing. Moreover, the punch which is an upper metal mold | die is provided with the step part in the one side or both sides | surfaces.
Therefore, when pressurizing the metal plate placed on the lower mold with the punch, the U-bending process is started due to the relationship between the tip of the punch and the upper end of the inner wall of the rotary die, and then the tip of the punch passes through the metal plate. From the point of time when the bottom wall top surface of the substantially L-shaped cross-section rotating die is reached, the downward pressing force of the punch is changed to the inward direction of the substantially L-shaped cross-section rotating die vertical wall. The flange can be bent on one or both upper ends of the U-bending side by the substantially right-angle bending and the action of the step portions provided on the upper surface of the rotating die and the side surface of the punch. That is, by devising the shape of the mold and the shape of the punch, a bending member having one flange or both flanges can be manufactured in only one step of punch pressing.

In the apparatus of the present invention, since the sliding distance of the substantially L-shaped rotating die is short and the bending / unbending deformation at the die shoulder radius is alleviated, it is difficult to cause wrinkles. Even when the metal plate to be processed is a plated metal plate or a painted metal plate, peeling of the plating film or the paint film is suppressed.
Further, since the die is openable and closable by rotation, the product can be easily taken out after processing.

The present inventors examined a method for efficiently pressing a U-bending member having one flange or both flanges.
As a result, by devising the shape of the mold, a mold that can be combined with U-bending and flange bending by only one stage of press work has been devised, and the present invention has been achieved.
Details thereof will be described below.

First, the mold shape will be described with reference to FIG. The lower mold 11 is divided into two parts, each having a vertical wall 13 with an R at its upper end and a bottom wall 14 open on the side, and the vertical wall cross-sectional center and the bottom wall cross-sectional center. It is composed of two substantially L-shaped cross-section rotating dies 12 which are urged so that the upper end is rotated outward with the line intersecting as a fulcrum 15 and the open sides face each other. The outward rotation of the upper end is restricted at a predetermined angle. Further, the upper end of the L-shaped vertical wall surface of the rotary die 12 is attached with R and continues to the upper surface. Further, a cushion in which a connecting rod 17 having an upward biasing device made of a spring or the like attached to the back surface is connected in the recess of the lower mold 11 constituted by two substantially L-shaped cross-section rotating dies 12. It is preferable that the pad 16 is disposed. The upper surface width of the cushion pad 16 is preferably slightly wider than the tip width of the U-bending member to be molded. Moreover, it is preferable that the connecting rod 17 penetrates the notch recessed part formed in the front-end | tip of the bottom wall 14 of the substantially L-shaped cross-section rotary die 12. FIG.
When the cushion pad 16 is provided, it is desirable that the spring force of the urging device attached to the connecting rod 17 is sufficiently higher than the deformation pressure of the press-molded metal plate. However, it is necessary to adjust so as to be lower than the pressing force of the punch.

  On the other hand, the punch 18 serving as the upper die is provided with a step portion 19 extending vertically outward on one side surface or both side surfaces. In addition, description based on FIG. 4 is description of the metal mold | die which manufactures the member which has a single flange. Needless to say, a die having a stepped portion on both sides of the punch 18 may be used as a mold for manufacturing a U-bending member having both flanges. The step portion 19 is not provided integrally with the main body of the punch 18, and the height position of the step portion can be adjusted with respect to the punch 18 as an auxiliary punch on the side of the main body separately from the main body of the punch 18. It may be installed to be.

A method for processing a U-bending member with a single flange will be described using the press processing apparatus. Even in the U-bending member with both flanges, the same procedure is used.
The metal plate S to be bent is placed on the two rotating dies 12 arranged so that the upper ends thereof are horizontal to each other (see FIG. 4a). Thereafter, pressure is applied to lower the punch 18 downward, and the metal plate S is pressurized with the punch 18. When the metal plate S is pressed by the punch 18, the metal plate is pushed into the recess formed between the two L-shaped movable dies 12 in the cross section, and between the tip of the punch and the upper end R of the vertical wall of the rotary die 12. The U-bending process is started in between. In the apparatus shown in FIG. 4, the cushion pad 16 is disposed, and the spring force of the urging device is set sufficiently higher than the bending strength of the metal plate and lower than the pressing force below the punch 18. Therefore, the metal plate S is sandwiched between the front end surface of the punch 18 and the upper surface of the cushion pad 16 (see FIG. 4b), so that a flat surface with excellent surface properties can be obtained at the front end. It is possible to prevent wrinkles on the head and to reduce spring back.
The upper end of the L-shaped vertical wall of the rotary die 12 is connected to the upper surface with an R. Accordingly, when the metal plate S is pushed into the recess by the punch 18 during the U-bending process, the frictional force between the metal plate S and the die is reduced by the action of R, and wrinkles that are easily formed on the surface of the metal plate are generated. It is suppressed.

  In the apparatus shown in FIG. 4, after the punch 18 pressurizes the metal plate S and the tip of the punch 18 contacts the bottom surface of the rotary die 12 via the U-bent metal plate S and the cushion pad 16, the bias is applied. Since the spring force of the apparatus is set lower than the pressing force of the punch 18, the punch 18 presses the tip of the bottom wall 14 of the rotary die 12 downward. Accordingly, the rotary die 12 rotates with the fulcrum 15 as a rotation axis so that the vertical walls 13 are close to each other, that is, in a direction in which the side where the U-bending starts is bent at a right angle. In an apparatus in which the cushion pad 16 is not disposed, the tip of the bottom wall 14 of the rotary die 12 is pressed downward via the metal plate S in which the pressing force of the punch 18 is U-bent. Rotating about the fulcrum 15 as a rotation axis, the vertical wall 13 is moved so that the tip portions thereof are close to each other, and the side where the U-bending has started is bent in a perpendicular direction.

After the side where the U-bending of the metal plate to be bent has started is brought into contact with the step portion 19 provided on the side surface of the punch 18, the R portion between the upper end of the L-shaped vertical wall and the upper surface of the rotary die 12. Presses the metal plate S into the corner portion between the side surface and the step portion of the punch 18 to bend the flange portion 20 on one or both sides of the bent U-bending side, thereby bending the flanged U-bending member. Processing ends.
At this time, if the inner surface of the vertical wall 13 and the upper surface of the bottom wall 14 of the substantially L-shaped cross-section rotating die 12 are provided so that the intersecting angle α (see FIG. 4a) is less than 90 degrees, Since the metal plate to be processed is bent so that its U-bending side once exceeds 90 degrees in consideration of the elastic recovery amount, it becomes easy to obtain a U-bending member bent at a right angle after elastic recovery.

At the time of flange bending, instead of the stepped punch 18, a double punch consisting of a main punch and an auxiliary punch arranged on its side is used, and the main punch is pushed to the required depth of the U-bending member and the fulcrum 15 is used as an axis. After rotating the rotary die 12 and bending the side where the U-bending started by the vertical wall 13 at a right angle, the end of the metal plate may be pressed against the upper surface of the rotary die 12 with an auxiliary punch to bend the flange. By using the auxiliary punch, the U-shaped depth of the U-bending member can be easily adjusted.
Thereafter, when the downward pressing force of the punch 18 is released and pulled upward, the U force is applied by the outward biasing force of the rotary die 12 or by the upward pressing force of the biasing device connected to the cushion pad 16. Both bending members are moved upward. If the punch 18 is retracted upward or sideward, the bending member can be easily taken out.

Sectional drawing explaining the manufacturing method of the U bending member by the conventional press work method A perspective view explaining an example of a U-bending member Sectional drawing explaining the conventional manufacturing method of U bending member with a flange Sectional drawing explaining the manufacturing method of the U-bending member with a flange of this invention

Explanation of symbols

11: Lower mold 12: Rotating die 13: L-shaped vertical wall 14: L-shaped bottom wall
15: fulcrum 16: cushion pad 17: connecting rod 18: punch
19: Step 20: Flange
S: Metal plate

Claims (7)

  Two substantially L-shaped cross-section rotary dies having a substantially L-shaped cross section and having a fulcrum as a line intersecting the center of the cross section of the L-shaped two walls, A metal plate to be processed is placed on a lower mold that is urged so as to be rotated outward, and a punch having a step on one side surface or both side surfaces is placed above the metal plate to be processed. Is pushed into the lower mold recess formed by the substantially L-shaped rotary die to start U-bending, and the pressing force of the punch is applied to the upper surface of the bottom wall of the substantially L-shaped cross-sectional rotary die via the metal plate. After reaching this point, the pressure applied to the lower side of the punch is changed to the pressure applied to the inner side of the vertical wall of the L-shaped cross-section rotary die, the U-bend side is bent at substantially right angle, the upper surface of the rotary die, and the punch The flange bending of one side or the upper end of both sides is performed by the action of the step provided on the side surface. U bending method of members having a single flange or flanges.   The single flange or both flanges according to claim 1, wherein U bending is started while supporting a metal plate with a cushion pad biased upward in a lower mold recess formed by two substantially L-shaped rotating dies. A method for processing a U-bending member.   Instead of a punch having a step on the side, a main punch with flat sides and an auxiliary punch arranged on one side or both sides of the main punch are used, and after bending the flange by using an auxiliary punch A method for processing a U-bending member having one or both flanges according to claim 1 or 2.   It has a vertical wall with an R at the upper end and a bottom wall open to the side, and the upper end is rotated outward with a line that intersects the vertical wall cross-sectional center and the bottom wall cross-sectional center as a fulcrum. A lower die composed of two substantially L-shaped cross-section rotating dies that are biased and arranged to face each other on the open side, and a tip flat surface width equal to the inner surface tip width of the desired U-bending member; A pressing apparatus for processing a U-bending member having a single flange or both flanges, comprising a punch having a step portion extending outwardly from one side surface or both side surfaces.   The single flange or the flange according to claim 4, wherein a cushion pad connected via a connecting rod on the urging device is disposed in a recess of a lower mold constituted by two substantially L-shaped cross-section rotating dies. U-bending member processing press with both flanges.   6. The U having a single flange or both flanges according to claim 4 or 5, wherein the intersecting angle between the inner surface of the vertical wall and the upper surface of the bottom wall of the substantially L-shaped section rotating die is set to be less than 90 degrees. Bending member processing press.   Instead of the stepped punch, a straight main punch having the same tip flat surface width as the inner surface tip width of the desired U-bending member, and an auxiliary punch arranged on one side or both sides of the straight main punch. A pressing device for processing a U-bending member having a single flange or both flanges according to any one of claims 4 to 6, wherein the press device is composed of a double punch made of

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