JPH0455023A - Bender - Google Patents

Abstract

PURPOSE:To prevent the rotation of a work by force couple and to obtain bent parts bent to an adequate three-dimensional shape by bringing die units into pressurized contact with the outer peripheral surface of the work by driving means and subjecting the work to three-dimensional bending while the circumferential rotation of the work is held restrained. CONSTITUTION:The inside surfaces of the die units 6, 9 are brought into pressurized contact with the outer peripheral surface of the work A by driving respective die unit drives 4, 5 to restrain the displacement of the work A in the rotating direction. A pushing metal 13 is driven forward in the pressurized contact stage and a movable gyro die 2 is three-dimensionally actuated to three- dimensionally bend the work A. The rotational of the work is prevented by the pressurized contact force even if the force couple acts on the work by a change in the centroid position of the worked part moving successively by drawing the three-dimensional shape forward of the movable gyro die at this time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a so-called multi-bender type bending device that performs three-dimensional targeting of a circular workpiece made of metal such as aluminum or the like, such as a round pipe or a round bar.

Conventional technology When bending long aluminum materials used for building materials, machine parts, automobile parts, etc., such as irregularly shaped materials, into two or three dimensions, there is recently a process called a multi-bender. Bending machines tend to be preferred.

As shown in FIG. 6, this multi-bender includes a fixed mold (52) having a workpiece through hole (51) whose cross-sectional shape corresponds to the outer peripheral shape of the workpiece and whose cross-sectional size approximately matches the workpiece size. , which is disposed at the front position of this fixed mold (52) and has a similar workpiece conduction hole (53),
A movable gyro mold that can be turned and displaced in three dimensions (
54), and a work feeder (55) which is disposed at a rear position of the fixed mold (52) and transports the work toward the workpiece through hole (51) of the fixed mold (52). Then, the feeder (55) forces the workpiece (B) into the two mold conduction holes (51) and (53), and the movable gyro mold (54) is operated to prevent the workpiece (B) from bending. conduct.

As is clear from the above, this multi-bender bending process predominantly utilizes the so-called compression bending principle, in which the workpiece is bent while being pushed, so local elongation of the material is relatively small. This method has the advantage that bent products with fewer material defects and surface defects can be obtained.

Problems to be Solved by the Invention However, on the other hand, the conventional multi-bender described above has a drawback in that it cannot successfully perform three-dimensional bending of a circular workpiece.

That is, in three-dimensional bending, the workpiece portion that has passed through the through hole (53) of the movable gyro mold (54) is moved forward while exhibiting a three-dimensional shape. Therefore, during this transition, the position of the center of gravity of the entire passing portion of the conduction hole (53) changes and a couple is generated, which attempts to rotate the workpiece (B) around its axis.

In such a case, if the outer circumferential shape of the workpiece (B) is irregular as shown in the figure, the workpiece (B) will have a conductive hole (51) (53
) is engaged with the inner circumferential surface of the workpiece and rotation about the axis is restrained, so that rotation does not occur and the workpiece is bent into the desired three-dimensional shape.

However, if the outer circumference of the workpiece is a circular shape that is not irregular,
When the couple occurs, the workpiece is connected to the conduction hole (51) (53)
As a result, the workpiece rotates around its own axis, causing an error in the rotational position of the workpiece relative to the movable gyro mold (54), preventing it from being bent in the proper direction. It is not possible to obtain a three-dimensional shape.

It is an object of the present invention to provide a multi-bender bending device that eliminates the above-mentioned conventional drawbacks and enables three-dimensional bending of circumferentially circular workpieces such as round vibrators and round bars.

Means for Solving the Problems In the above object, the bending apparatus of the present invention includes a fixed mold having a workpiece through hole, a fixed mold disposed in front of the fixed mold, also having the workpiece through hole, and A movable gyro mold capable of turning and displacing in three-dimensional directions; and a work feeder disposed at a rear position of the fixed mold to transfer a work toward a work passage hole of the fixed mold, the feeder A bending device that bends a workpiece by forced conduction of the workpiece to the conduction hole of both molds by the operation of the movable gyro mold and the operation of the movable gyro mold, wherein at least one of the two molds is connected to the conduction hole of the workpiece. The mold unit is divided into a plurality of mold units in the circumferential direction by sandwiching the workpiece, and is provided with a mold unit driving means for pressing the mold unit against the surface of the workpiece in a manner that restrains rotation of the workpiece in the circumferential direction. The gist is a bending device that is characterized by:

Function: In the bending apparatus described above, the three-dimensional bending of a circular workpiece is performed in a state in which the drive unit is operated to press the mold unit against the workpiece's outer peripheral surface, thereby restraining rotation of the workpiece in the circumferential direction. As a result, the position of the center of gravity of the workpiece that moves in a three-dimensional shape in front of the movable gyro mold changes, and even if a couple occurs, the workpiece does not rotate due to the above restraint, and therefore, the workpiece does not rotate as expected. A bent product with a three-dimensional shape can be obtained.

Example The present invention will be explained in detail below.

In the bending apparatus shown in FIG. 1, (1) is a fixed mold, (2) is a movable gyro mold placed in front of the fixed mold (1), and (3) is a fixed mold (1). ) The work feeder (4) and (5) are located at the rear of the mold unit drive device.

As shown in Figs. 2 and 3, the fixed mold (1) consists of a pair of upper and lower mold units (6) (6) arranged opposite each other, with a circumferential circular workpiece placed between them. A workpiece conduction hole (7) with a circular cross section and a size matching (A) is formed. Each mold unit (6) (6) has a holding mold member (B
On the inner surface of a), on the inlet side, a restraining mold member (6b) is attached.
However, there is also a bending fulcrum mold member (
Be) are arranged adjacent to each other.

On the other hand, the movable gyro mold (2) is also made up of a pair of upper and lower mold units (9) (9) that are arranged opposite each other, as shown in Figures 3 and 4. Similarly, workpiece conduction holes (10) having a circular cross-section shape and having a size suitable for the workpiece (A) having a circular circumference are formed. The gyro mold (2) is movable vertically and horizontally, and the gyro mold mounting is attached to a frame (not shown), and the gyro mold (2) can be turned and displaced three-dimensionally using the gyro principle. Ru.

The mold unit drive devices (4) and (5) are of an electromagnetic type or the like, and as shown in FIG.
1) and the movable mold (2), and the mold units (6) and (9) are connected to the conductive holes (7) (
10) is operated so as to press against the outer peripheral surface of the workpiece (A) inside.

Further, the work feeder (3) includes a cylindrical feed case (12) and a pusher (13) that runs in the front-rear direction inside the feed case (12). In addition, pusher metal (
13) is a projecting piece (13a) provided on both sides thereof.
, the left and right slits (12a) of the feed case (12).
) and protrudes from the side of the case (12), and is moved by operating a drive device connected to the projecting piece (13a), and transfers the workpiece (A) to the fixed mold (1) side. It is assumed that

Three-dimensional bending of a circumferentially circular work by the bending apparatus described above is performed as follows. First, place the workpiece (A) in the feed case (12), and press the tip of the workpiece (A) with the pusher metal (13) into the conduction hole (7) of both molds (1) and (2).
(10) is electrically connected. Then, the inner surfaces of the mold units (6) and (9) are brought into pressure contact with the outer circumferential surface of the workpiece (A) by driving the respective mold unit driving devices (4) and (5).
restrains displacement in the direction of rotation. In addition, the pressure applied to the workpiece (A) does not cause rotation of the workpiece (A) during three-dimensional bending, and does not impede the conduction of the workpiece (A) into the molds (1) and (2). This range is determined based on calculated values, empirical data, etc. In the pressed state, drive the pusher (13) forward,
The movable gyro mold (2) is operated three-dimensionally to perform three-dimensional bending of the workpiece (A). At that time, even if a couple acts on the workpiece due to a change in the center of gravity position of the processed part that draws a three-dimensional shape in front of the movable gyro mold, the workpiece will not rotate due to the pressure contact force. do not have.

In the present invention, only one of the two molds (1) and (2) may be divided, and the work may be pressure-welded using only that mold. Further, when processing a bent pipe product with a small radius of curvature, it is preferable to appropriately arrange a mandrel within a fixed mold to prevent surface defects such as wrinkles and depressions from occurring in the product.

Effects of the Invention As described above, in the multi-bender type bending device of the present invention, at least one of the fixed die and the movable die is
A mold unit driving means is provided which is divided into a plurality of mold units in the circumferential direction across the workpiece conduction hole and presses the mold unit against the workpiece surface in a manner that restrains rotation of the workpiece in the circumferential direction. Therefore, when performing three-dimensional bending of a circular workpiece, the driving means presses the mold unit against the workpiece's outer peripheral surface and performs the three-dimensional bending process while restraining circumferential rotation of the workpiece. By carrying out, the rotation of the workpiece due to the force couple is prevented, and therefore,
A bent product having the desired three-dimensional shape can be obtained.

[Brief explanation of the drawing]

Figures 1 to 5 show embodiments of the bending apparatus of the present invention, in which Figure 1 is a perspective view showing the overall configuration of the bending apparatus, Figure 2 is a vertical sectional view of a fixed mold, Figure 3 is the second
4 is a longitudinal sectional view of the movable mold, and FIG. 5 is a front view of the movable mold. FIG. 6 is a perspective view showing a conventional bending device. (1)...Fixed mold, (2)...Movable mold, (3)
... Work feeder (4) (5) ... Mold unit drive device, (6) (9) ... Mold unit, (7) (10
)...Workpiece conduction hole. Above Figure 2 Song 5 Figure 4 Figure 3 [:+-s Figure 5

Claims (1)

[Scope of Claims] A fixed mold having a workpiece conduction hole, and a movable gyro mold disposed in front of the fixed mold, also having a workpiece conduction hole and capable of turning and displacing in three dimensions. , a work feeder disposed at a rear position of the fixed mold and configured to transfer the work toward the work conduction hole of the fixed mold; the feeder forcibly conducts the work to the conduction hole of both molds; A bending device that bends a workpiece in cooperation with the operation of a movable gyro mold, wherein at least one of the two molds is divided into a plurality of mold units in the circumferential direction with a workpiece conduction hole in between. 1. A bending device comprising: a mold unit driving means for pressing the mold unit against the surface of the workpiece in a manner in which rotation of the workpiece in the circumferential direction is restrained;