JPS5944133B2 - Shape bending method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for bending an extruded aluminum profile.

For example, the side trunk 1 of a motorcycle has split main bodies 2 and 3 made of plastic, as shown in FIGS. 1 and 2, and their opening edges are reinforced with aluminum edging sections 4 and 5. At the same time, it is connected by two hinges 6 at the bottom and can be opened and closed by a locking fitting 7 at the top.

The side trunk 1 can be detachably attached to the rear side of the motorcycle using a special attachment device, and can be carried around using a handle 8 after being detached. Now, the above-mentioned pair of annular shapes 4 and 5 both have a large circular arc portion on their entire circumference, and further partially form small circular arc portions Ili, R, . . . horses, among which the circular arc portions is in the opposite direction to the arc portion.

Moreover, one of the sections 4 has a mounting groove 9 along the longitudinal direction and a mounting groove 12 for receiving the packing 11, and the other section 5 has a protrusion 13 along the longitudinal direction for fitting. Due to the attachment groove 10, they are asymmetrical. Therefore, when these sections 4 and 5 are processed using a normal bending machine, the shape after processing is deformed due to complex stress and strain, and furthermore, the neutral plane of stress and strain shifts from the center, so that the section 4 , 5 becomes twisted and becomes a defective product.

By the way, conventionally, a mandrel is inserted into the groove of the workpiece,
Bending a workpiece so that it appears to be a solid body is publicly known.

In addition, with conventional technology, bending force is applied by rotational force, and at the same time, the bending angle is regulated by the rotation angle, so it is difficult to set the amount of rotation accurately, which limits the bending accuracy. There is. The applicant has repeatedly conducted various experiments based on such conventional techniques, but since the bending angle is different each time when bending the sections 4 and 5 one after another, it has not been possible to obtain good results from the viewpoint of processing accuracy. I couldn't get it. SUMMARY OF THE INVENTION An object of the present invention is to obtain a highly accurate bending method and at the same time provide an apparatus that is most suitable for the method and can also be adapted to changes in the bending process of the shape.

Hereinafter, the present invention will be specifically explained based on an embodiment shown in the drawings.

First, FIG. 3 shows the principle of the bending method of the present invention.

In the first step, the workpiece, for example the above-mentioned profile 4, is cut to a predetermined length, and then semi-hardened plastic, i.e., spacers 14 and 15 having a hardness of about 93 to 95 degrees, are placed inside the mounting grooves 9 and 12. It is inserted as shown in Figure 4.
This fitting work can be easily done by inserting one end of the spacers 14, 15 into the mounting groove 9 or the mounting groove 12, and then pressing these spacers 14, 15 along the longitudinal direction of the profile 4 with a roller or the like (not shown). can. Well, if you soak spacers 14 and 15 in hot water in advance, spacer 1
4 and 15 are made flexible, their work efficiency is increased. However, due to the subsequent temperature drop, the spacers 14 and 15
The hardness of the material settles within a predetermined range. In the next step, the section 4 is placed inside the groove 17 of the bending die 16 with a predetermined curvature, and then a flat presser plate 18 is placed on the outside of the section 4.
The presser plate 18 is pressed from the direction of a predetermined bending angle α so that the profile 4 is wound around the bending mold 16.

This pressing is performed by moving a pressing member, such as the roller 19, in the direction of the arrow, in a straight line parallel to the tangent line along the bending angle α of the tab b. Here, the bending angle α is given by the sum of the bending angle β and the springback angle γ. This bending method brings about the following unique effects.

First, since the spacers 14 and 15 are interposed in the groove portion of the profile 4, the collapse phenomenon of the groove portion does not occur, and the stress strain distribution is also substantially uniform, so that twisting after processing is reliably suppressed. In addition, since the profile 4 is bent while being wrapped around the bending die 16 by the presser plate 18, the spring back is small and the profile 4 is hardly subjected to elongation or contraction force in the longitudinal direction. The external dimensions of the annular shape member 4 are narrow and within an error range. In particular, the present invention provides the following unique effects. Even if the roller 19 advances more than necessary, the presser plate 1
8 does not roll beyond the bending angle α, so the bending angle α can always be set constant regardless of the amount of movement of the roller 19. Therefore, if the pressing direction is set in advance, there will be no error in the amount of bending, and the bending angle α can be accurately regulated. For the reasons mentioned above, this direction is extremely useful for bending asymmetrical grooved profiles that require high precision.
Moreover, since high precision is not required for the pressing operation, workability is also good. Now, FIGS. 5 to 8 show the bending apparatus of the present invention.

In this bending device, a plurality of bending dies 21, 22, . At the same time, a presser plate 28 is placed on the processing table 20.
A pressing cylinder 30 for driving the bending member 30 is configured to be removable in the direction of a predetermined bending angle α. The above-mentioned bending dies 21, 22, . Bending die 21 for forward bending part
, 22, 23, 25, 26, and 28 are guide grooves 40 that conform to the inner shape of the sections 4 and 5 at the upper and lower positions, as shown in FIG.
41, and the bending die 24 of the reverse bending part is the seventh
A guide groove 42 corresponding to the outer shape of the sections 4 and 5 as shown in the figure.
, 43. The mounting shaft 32 is provided at each bending position, and can be freely moved in and out by means of a suitable driving means below the processing table 20. Also, press cylinder 3
0 is a lower positioning pin 33 installed in a positioning hole 34 for each processing position on the processing table 20 in a predetermined direction by a positioning claw 35, and a pressing roller 39 at the tip of the cylinder rod 36. It touches the back side of the presser plate 28.
The actual presser plate 28 has guide grooves 3 in the upper and lower positions as shown in FIG.
Note that the holding body 29 is attached to an eccentric shaft 44 with a handle, and is attached to a fixing hole 4 in the processing table 20.
5 so that it can be removably attached. In addition, the processing table 20 has a stop collar 46 and a pair of clampers 47, 48 at the processing start position. The stopper 46 is fixed to the tip of the slide bar 49, and the stopper 49 is attached to the support block 50 so as to be movable forward and backward. Also, one clamper 47 is fixed,
The other clamper 48 is mounted so as to be movable forward and backward by an operating cylinder 51. Next, the actual operation will be explained step by step.

This device simultaneously processes a pair of sections 4 and 5. This is to bring the machining conditions closer to each other between the pairs. In the first step, the sections 4 and 5 of a certain length are bent to the curvature of the circular arc portion. Since the radius of curvature of this arc portion is large, there is no deformation during processing. Therefore, this bending process can be performed using a general stretch bender.
In the following process, holders 5 are attached to both ends of the pair of shapes 4 and 5.
2 and 53 are fixed, a holding interval between the pair of shapes 4 and 5 is set, and both are integrated. The holders 52, 53 are of a two-split screw type and are tightened by a tightening screw 54. Next, one end of the sections 4, 5 is brought into contact with the stopper 46, and the portion near the end is fixed with a pair of clampers 47, 48, and then the mounting shaft 32 corresponding to the arc portion is attached to the processing table 2
A bending mold 21 corresponding to this mounting shaft 32 is made to protrude from the upper surface of the
Insert the mounting hole 31 in the center of. After this, based on the method described above, the presser plate 28 is applied to the sections 4 and 5, and this is indirectly rolled with the press cylinder 30 against the bending die 21 with the sections 4 and 5 interposed. Let them come into contact with you. The pressing cylinder 30 has a positioning pin 33 and a positioning claw 35.
It is set in the direction of the bending angle α. Note that the positioning pawl 35 receives the rotational force applied to the press cylinder 30 during operation. At this time, the other mounting shaft 32 has been lowered and is no longer protruding from the upper surface of the processing table 20, so the pair of shapes 4 and 5 that are temporarily bent by the bending angle β or more is not obstructed. It is in a state where it can be bent up to the bending angle α. When the machining of the arc portion is completed, insert the eccentric shaft 44 with handle of the holder 29 into the fixing hole 45 at that position, and operate the handle portion to attach the eccentric roller-shaped holder 29 to the processed shape 4. , 5 to prevent it from restoring. At the next processing position, a corresponding bending mold 22 is attached in the same manner, and the press cylinder 30 is moved and installed at that processing position to process the arc part horse. Is this kind of work required for arc portions B8, H4...? It is done in the same way. With this device, the method described above can proceed reasonably efficiently. In particular, the bending dies 21, 22 on the processing table 20...
...27} and the press cylinder 30 are removable from the processing table 20, so even after the sections 4 and 5 exceed the bending angle β, their tips do not obstruct the next bending position. Therefore, multiple bending processes can be performed on one piece in succession while maintaining the initial clamped state. In addition, if the bending position or curvature of the shapes 4 and 5 as workpieces is changed, the bending die 21
, 22, . . . 27 and the mounting position thereof, and the press cylinder 30, press plate 28, etc. can be used as they are, this device can be flexibly adapted to changes in the design of the workpiece. In particular, with this device, the pressing direction is set in advance for each bending position, so the bending angle can be accurately regulated regardless of the stroke of the pressing cylinder, which facilitates precision control and improves work efficiency. Sexuality is enhanced. Note that the attachment relationship of the attachment hole 31 and the attachment shaft 32 to the bending dies 21, 22, . . . 27 and the processing table 20 may be reversed.

Further, the press cylinder 30 may be installed at each processing position.

[Brief explanation of drawings]

Fig. 1 is a side view of a side trunk for a motorcycle in which a workpiece is incorporated, Fig. 2 is an enlarged sectional view taken along the - line in Fig. 1, and Fig. 3 explains the bending method of the present invention. FIG. 4 is an enlarged sectional view of the spacer inserted into the workpiece (shape), FIG. 5 is a plan view of the bending apparatus of the present invention, FIGS. 6 and 7. 8 is an enlarged sectional view of a part of the bending die, and FIG. 8 is an enlarged sectional view of a presser plate. 1... Side trunk, 4, 5... Profile, 9, 10
...Mounting groove, 12...Mounting groove, 14,15...Spacer, 20...Processing table, 21,22...2
7... Bending die, 28... Pressing plate, 30... Pressing cylinder.

Claims (1)

[Claims] 1. After inserting a spacer made of semi-hardened plastic into the groove of a profile to be processed, the profile is applied to the side surface of a fixed bending die, and then the profile is placed at the bending position. A flat presser plate is brought into contact with the outside of the profile, and the presser plate is pressed in a direction parallel to the tangent of the bending die along the bending angle that is the sum of the bending angle and the springback angle, A method for bending a shaped material, characterized in that the presser plate is brought into contact with the bending die, and while the shaped material is wound around the bending die, a similar round bending process is sequentially carried out at the next processing position. 2. A grooved bending mold is removably provided on a flat processing table for each bending position of the workpiece, and a flat presser plate is removably attached to this bending mold, and The press cylinder of the holding plate is removably installed on the processing table for each bending die on a straight line parallel to the tangent of the bending die along the bending angle that is the sum of the bending angle and the springback angle. Characteristic shape bending equipment.