JP2829350B2 - Bending method for plate materials - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending method for bending a workpiece such as a plate or a pipe into a desired curved shape.

[Prior Art] Conventionally, when a desired curved shape is formed by bending a plate material or a pipe material, a member to be processed such as a plate material or a pipe material is placed on a concave portion of a die, and the workpiece is processed. By performing operations such as tapping the member while adjusting the member with a punch to dent the workpiece into the recessed portion at a plurality of locations of the workpiece, the entire workpiece can be bent into a desired curved shape. And bend into a special shape such as a spiral shape or a meandering shape. In addition, there is a case where the material is bent into a shape as described above using a forming roller.

[Problems to be Solved by the Invention] However, in the conventional bending method described above, it is difficult to control the force when hitting and denting the workpiece, and this is because the workpiece is provided with a springback. In addition, there is a problem that a high degree of skill and skill are required to accurately bend a workpiece to a curved shape having a desired radius of curvature, and that there is a problem that anyone cannot easily perform the bending.

Further, in the bending method using a forming roller, a forming roller having a forming surface adapted to the desired shape must be replaced and used every time a desired shape is different, and a very wide variety of forming rollers are prepared. There was a problem that it was necessary and was very disadvantageous economically.

SUMMARY OF THE INVENTION The present invention solves the above problems, and enables a beginner to easily and quickly bend a workpiece in a desired curved shape or a right angle quickly and accurately without any distortion, without any special training. It is an object of the present invention to provide a method for bending a plate material or the like that can be performed.

[Means for Solving the Problems] In order to achieve the above object, a method for bending a plate material or the like according to the present invention requires an exit when bending a workpiece such as a plate material or a pipe material into a curved shape. While the feed of the workpiece is stopped intermittently while the workpiece is being intermittently sent out from the outlet of the die connected with the periphery, the pusher is moved by a fixed width to move the workpiece into the mold. Bending into a curved shape by repeatedly pressing against the outlet end of the
Further, the bending of the workpiece at a right angle is performed by moving the pressing tool with a width larger than the predetermined width.

[Operation] According to the present invention, when it is desired to bend a workpiece to a desired curved shape, the pusher is moved by a certain width every time the workpiece to be intermittently fed from the outlet of the mold is stopped. By repeatedly moving and pressing the work piece against the exit side end of the mold and bending it by a certain angle, anyone can easily and quickly turn the whole work piece into a curved shape without requiring advanced skills and skill. Can be bent. Further, when the workpiece is to be bent at a right angle, the pressing member can be moved easily and quickly by making the moving width of the pressing tool larger than the predetermined width and bending the workpiece. Here, since the periphery of the outlet of the die is connected, even if the workpiece is strongly pressed against the outlet end of the die by the movement of the pressing tool, the outlet causes distortion in the opening direction. Without
It is possible to precisely bend a workpiece to a predetermined curved shape or a right angle.

Embodiment FIGS. 1a to 1b show a procedure for performing a bending process according to an embodiment of the present invention. In the same figure, the inner surfaces opposite to each other are formed as a pair of flat mold members 10, 10, and the side ends 11 of the outlets 14 are sharpened at an acute angle and formed in a tapered shape. As shown in FIG. 3, the outlets 14 are interconnected by screw shafts 20 and 21 screwed to upper and lower ends of the outlet 14, respectively, so that the mutual distance L can be adjusted up and down. That is, the shape members D are connected around the outlet 14 by connecting the upper and lower directions by integral connection of the shape members 10 and 10 and connecting the left and right directions by the screw shafts 20 and 21. The screw shafts 20, 21 are linked by a chain 22, and an operation mechanism 23 is connected to one of the screw shafts 20, and the screw shafts 20, 21 are moved in the forward or reverse direction through the operation mechanism 23. A mechanism for adjusting the mutual distance L by rotating the pair of mold members 10, 10 to approach or separate from each other is configured.

Reference numeral 12 denotes a pusher which is configured to be able to approach and separate from the side end 11 of the outlet 14 of the above-mentioned mold members 10 and 10 along the arc path AA illustrated in FIG. 1a. Reference numeral 13 denotes a feed roller for feeding the workpiece 1.

In the above, when the workpiece 1 is a plate 1 ', the feed roller 13 is rotated by a predetermined angle, for example, as shown in FIGS. And the thickness t of the plate 1 ′
The distance L between the pair of mold members 10, 10 is adjusted and fixed according to. Then, a predetermined portion (a) of the plate material 1 'is located at the outlet.
At a position facing the side end 11 of 14, the feeding of the plate 1 ′ is stopped, and then the pusher 12 is moved rightward by a fixed width H as shown in FIG. Is pressed against the outlet-side end portion 11 to bend the portion (a) by a certain angle. Thereafter, as shown in FIG. 1d, the pusher 12 is retracted to the original position, and the feed roller 13 is rotated by a predetermined angle to feed out the plate material 1 'to be processed. Feeding is stopped with the remote location b facing the outlet end 11. Then, the pusher 12 is again moved to the right by the constant width H to
As shown in FIG. 1e, a predetermined portion b of the plate material 1 'to be processed is pressed against the outlet end portion 11 and bent at the same fixed angle as the above-mentioned portion a. By repeating the above operation, the plate material 1 ′ to be processed is bent at a plurality of positions at predetermined intervals,
The whole is bent into a desired curved shape. If the interval between the bent portions A, B,... Is relatively narrow, the entire portion is bent into a curved shape. If the interval is wide or narrow, a plurality of spaced portions are respectively curved. It is bent.

In the above-described method, if the moving width H of the pressing tool 12 is kept constant, the bending angle of each point (a, b,...) Of the plate 1 ′ to be processed becomes the same. Further, if the intermittent feed width D of the plate material 1 'to be processed by the feed roller 13 is fixed, as shown in FIG.
Are equal to each other. Accordingly, when bending into a curved shape of an arc, the portion of the plate material 1 'to be bent is equally divided into a plurality of portions, and the equally divided portions are the exit-side end portions of the mold members 10,10. The intermittent feed width D is determined so as to successively face the plate 11, and the bending angle of the plate material 1 ′ to be bent by one pressing of the pressing tool 12 and the radius of curvature of the curved portion to be formed by bending. If the number of times of bending is calculated from the above, it is possible to perform accurate bending processing using both these factors as factors. It is necessary to consider the springback of the workpiece 1 'in the bending angle of the workpiece 1' which is bent by a single pressing of the pusher 12.

If the work 1 'is to be bent at a right angle, the moving width of the pusher 12 is set to be larger than the moving width H so that the pressing tool 12 is formed into a sharply tapered shape smaller than the right angle as described above. What is necessary is just to move the said pusher 12 along the circular arc path | route AA toward the exit side end part 11 of the shape members 10 and 10 which are performed.

That is, when the plate 1 ′ is bent at a right angle, the plate 1 ′ is slightly restored after being bent by springback, so that the pusher 12 has passed under the outlet-side end 11 having the tapered shape. Later, the plate 1 'is further slightly moved upward, and the plate 1' is bent to an acute angle smaller than a right angle by the pusher 12, so that the plate 1 'is restored to a right angle by springback after the pusher 12 is retracted. Thus, a predetermined right-angle bent product is obtained.

FIG. 2 shows a curved portion of the plate material 1 'to be processed by the above-described procedure. In the figure, A is the opening angle of both ends of the arcuate curved portion formed by bending, a is the mutual opening angle of the portion bent by pressing the pusher 12, which is equal to the opening angle A. This is the angle of one division. R is the radius of curvature of the curved portion.

Although the above description is for the case where the workpiece 1 is a plate material 1 ′, the same bending can be performed when the workpiece 1 is a round pipe. In this case, the interval L between the pair of mold members 10, 10 is adjusted according to the outer diameter of the round pipe member.

By the way, when the workpiece 1 is a round pipe, a mold material having the same shape as the case where the plate material 1 'is bent, that is, a mold material 10, 10 as shown in FIG. When used, only one point on the peripheral surface of the round pipe material is pressed against the flat exit side end 11 of the shape member 10 by the pressing tool 12, and is locally located at one point on the inner portion of the round pipe material, that is, a portion compressed by bending. When the pressing force is concentrated, the round pipe material may not bend well, and may be deformed and bent. In order to prevent such deformation and bending, as shown in FIG. 4 and FIG.
It is preferable to form an arc-shaped molding surface 15 in such a manner that the periphery of the outlet 14 of the cylinder 0 is aligned with the outer peripheral surface of the round pipe material 1 ". Since the local pressing force is not concentrated as described above, the round pipe member 1 "can be bent without being deformed locally. This is particularly effective when bending at an angle.

FIG. 6 illustrates a case in which the round pipe 1 "is bent into a special shape. In this case, the round pipe 1" is intermittently connected to the outlets 14 of the pair of sections 10 (see FIG. 1a and the like). The round pipe material 1 "is intermittently rotated around its axis by a desired angle" b "with a roller or the like interposed therebetween, and when the feeding and rotation of the round pipe material 1" are stopped, the round pipe material 1 "is pushed. By moving the tool 12 by a fixed width, the round pipe material 1 ″ is pressed against the outlet end 11 (see FIG. 1a and the like) of the shape member 10 and is bent by a certain angle. The feeding and rotation of 1 "may be performed simultaneously, or one may be performed first and then the other. As shown in FIG. 6, when the round pipe member 1 "is rotated by the same angle at each of the bending points A, B,..., The bent round pipe member 1" is formed into a spiral shape as shown in FIG. It can be suitably used for applications such as a handrail of a spiral staircase.

It is also possible to bend the round pipe 1 "in a meandering shape. In this case, when bending a predetermined bent portion, the round pipe 1" is turned 180 degrees around its axis. By not rotating the round pipe 1 "when bending other bent portions, it is possible to perform a meandering bending process without twist.

[Effects of the Invention] As described above, according to the bending method of the present invention, while the workpiece is intermittently sent out from the outlet of the die, the pusher is moved by a fixed width every time the feeding is stopped. By simply repeating the operation of moving, without using a die, punch, or one forming roller selected from various types, and without requiring advanced skills and skills, it is possible to The working member can be easily and quickly bent into a predetermined curved shape. Further, when it is desired to bend the workpiece at a right angle, the bending can be performed easily and quickly by increasing the moving width of the pressing tool. Moreover, since the periphery of the exit of the die used for such bending is connected, even if the workpiece is strongly pressed against the exit end of the die by the pressing tool, the exit is distorted in the opening direction. Therefore, there is an effect that the workpiece can be bent to a predetermined curved shape with high accuracy.

[Brief description of the drawings]

1a to 1e are explanatory views showing a procedure of a bending method according to an embodiment of the present invention, FIG. 2 is a side view showing a curved portion of a plate material bent according to the procedure of FIGS. 1a to 1e, FIG. FIG. 4 is a plan view illustrating a mechanism for interconnecting a pair of mold members and adjusting a mutual interval, FIG. 4 is a longitudinal sectional side view showing a modification of the mold members, and FIG.
The figure is a cross-sectional view taken along the line VV in FIG. 4, FIG. 6 is an explanatory view in the case where a round pipe material is spirally bent, and FIG. 7 is a diagram of a spiral pipe material that is spirally bent. It is a side view. DESCRIPTION OF SYMBOLS 1 ... Workpiece member, 1 '... Plate material, 1 "... Round pipe material, 10 ... Mold material, 11 ... Exit side end part, 12 ... Pressing tool, 14
…… the exit of the mold, 15 …… the molding surface.

Claims (1)

(57) [Claims] When a workpiece such as a plate material or a pipe material is bent into a curved shape, the workpiece is intermittently fed from the outlet of a die member connected around the outlet while the workpiece is fed. When is stopped, bending the workpiece into a curved shape by moving the pressing tool by a constant width, pressing the workpiece to the exit side end of the mold material and repeatedly bending the workpiece by a constant angle, and ,
A method for bending a plate material or the like, wherein bending the workpiece at a right angle is performed by moving the pressing tool with a width larger than the predetermined width.