JPS6348609B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a bending device for bending a long member having a predetermined cross-sectional shape, such as a molding for a vehicle, in a two-dimensional direction and also in a three-dimensional direction. be.

Background technology For example, windshield molding M
(See Figures 1 and 2) After roll forming stainless steel strip material into a certain cross-sectional shape,
Curvature R ₁ , R ₂ ,
It is curved in a two-dimensional direction while changing the curvature R ₃ , and also curved in the vertical direction with a curvature R ₄ and R ₅ .

This bending device is constructed by connecting a plurality of discs in a serpentine shape, with a pair of left and right pinch rolls set on each disc, and moving each disc to the right or left along guide rolls. Yes (Japanese Patent Application Laid-Open No. 57-41828, 41829). However, this device is not suitable for curving objects whose bending ratio changes suddenly from a large bending ratio to a small bending ratio, and the entire device is relatively complex and manufacturing costs are high.Furthermore, it is not suitable for bending objects where the curvature changes suddenly from a large bending ratio to a small bending ratio. However, it is extremely difficult to adjust.

DISCLOSURE OF THE INVENTION The present invention provides a molding bending device which has an extremely simple structure, can sufficiently cope with any change in curvature, can easily adjust the curvature, and can be widely applied to bending operations for different uses. The purpose is to provide.

That is, in the bending device according to the present invention,
By attaching a presser roll that presses the molding material continuously fed from the roll forming machine against a large-diameter disk so that it can be repositioned and moved along the circumference of the disk, the axis of the molding can be made into a desired curvature in two dimensions. In addition, by installing a pair of upper and lower clamping rolls that reposition and move together along the circumference of the disc behind the presser roll so that their axes are offset, the desired curvature can be achieved in three-dimensional directions as well. It is configured to be curved.

Embodiments The following will be described with reference to FIGS. 3 to 9.

This bending device (see Fig. 3) consists of a long metal strip material S which is wound into a hoop shape by an uncoiler 1.
After being sequentially fed into a roll forming machine 2 and formed into a predetermined cross-sectional shape, the axial line thereof is arranged to be curved. In the uncoiler 1, if the strip material is heavy, a driving force may be applied, but if the strip material is light and has a small width and thickness, it may not be driven. Also,
In the roll forming machine 2, a plurality of pairs of upper and lower rolls 22a and 22b are supported by a stand frame (not shown) on a bed 21, and are arranged in plural sets in sequence at the rear. As it passes through metal strips and rollers, it is sequentially bent along the longitudinal direction and is formed into a molding material M having a constant cross-sectional shape. Behind the last roll, the cross-sectional shape of the molding material M is slightly modified, the twist is corrected, and the horizontal
Straightening devices may be provided to correct vertical curvature, etc.

The bending device 3 is configured based on a fixed plate 30. A base 31 is provided on the surface of the fixed plate 30 to receive the linear molding material M sent from the roll forming machine 2.
This cap 31 (see Fig. 4) has upper and lower molds 31a, 3
1b is fixed with bolts 31c to form a passage corresponding to the cross-sectional shape of the molding material M, and the lower mold 3
1b is attached to the fixed plate surface by tightening and fixing it with bolts or the like. A plurality of roll bearings or roll pieces 31e are installed in the mouth passage so as to be in contact with the molding material M in order to prevent damage to the bent outside of the molding material M. Immediately after the base 31, an encoder (not shown) is provided in contact with the molding material M to measure and detect the distance traveled by the molding material M as it travels. This cap 31
A disk 32 and a presser roll 33 are arranged on the plate surface of the fixed plate 30 behind the molding material M, with their circumferential sides facing each other with an interval corresponding to the width of the molding material M (see FIG. 3b). The disk 32 has a relatively large diameter (however, the minimum bending curvature of the molding material M
(less than twice R ₃ ), and is driven by the feed of the molding material M using the central shaft 32a as a support shaft, or is driven by a motor to drive the bearing or bush 3.
It is rotatably mounted via 2b. Also,
A receiving groove 32c for receiving one longitudinal edge of the molding material M is provided on the circumferential side of the disk 32 (see FIG. 5), and the molding material M is pressed against this receiving groove 32c by a presser roll 33. . In addition,
The disk 32 can be formed by forming a groove 32c on the circumferential side of one piece, or by laminating and fixing several pieces, depending on the shape of the molding material M.
The presser roll 33 is rotatably mounted on a support shaft 33b supported by a pedestal 33a via a bearing or a bush 33c, and also connected to a connecting plate 33.
It consists of two relatively small diameter rolls, front and rear, supported by d. This presser roll 33 also has
Receiving groove 3 for receiving molding material M on the circumferential side
3e is formed. These opposing disks 3
2 and the presser roll 33, only the presser roll 33 is attached to the surface of the movable plate 34. The movable plate 34 has a substantially rectangular plane, and a plate surface near one corner is pivotally supported on the same axis as the rotating shaft 32a of the disk 32 so as to be able to swing back and forth. That is the movable plate 34
The presser roll 33 is attached to the plate surface concave portion 34a of the disk 3 by fixing the pedestal 33a adjustable with bolts.
2, and is rotatable using a hydraulic cylinder 35 whose rod tip is connected to the block 34b as a driving source.

Furthermore, a pair of upper and lower synthetic resin holding rolls 36 are attached to the surface of the movable plate 34 along the direction in which the molding material M is followed behind the presser roll 33 (see FIG. 6). Each roller 36a,
Reference numeral 36b is a shaft hole formed to expand from the center of the hole toward both ends, and is supported on the axes of support shafts 36c and 36d. This is to cope with the fact that the feeding posture of the molding material is tilted when the presser roll 33 is repositioned and moved by the swinging of the movable plate 34, and can be slid on the axes of the support shafts 36c and 36d, and can also be freely moved to the right or left. It is mounted so that it can be shifted to the left. In addition, these clamping rolls 36a, 36
b connects both ends of the support shafts 36c and 36d to each connecting arm 3.
6e, 36f, and the connecting arms 36e,
It is attached by pivotally supporting 36f with support plates 36g and 36h. This is because one end of the rotary drive shaft 36i is connected to the connecting arm 36f on one side, so that the direction in which the molding material M is moved by each roll 36a, 36b can be shifted up and down. The other end of the rotary drive shaft 36i is connected via a worm gear or the like to a pulse motor (not shown) that can rotate forward and reverse a fixed number of times within a fixed interval according to a command.

The bending device 3 (7th and 8th
), when the angle β of the movable plate 34 with respect to the fixed plate 30 is β=0, the molding material M
is continuously fed out in a straight line without being bent in the horizontal direction.
If a certain amount of oil is supplied from behind the cylinder 35 within a certain period of time so that the rod 5 is extended, and the same amount of oil is discharged from the rod side, the extension of the cylinder rod causes the movable plate 34 to move by an angle β. When tilted, the presser roll 33 is deflected along the circumferential direction of the disk 32, causing the molding material to have, for example, a curvature.
Give R ₂ . In this state, the molding material is run a certain distance l ₂ and the encoder detects the distance l ₂ and outputs a signal.If the tilt angle is further increased, the amount of deviation increases and the molding material M It can be made to give a curvature R ₃ .
Similarly, when the encoder detects the travel distance 2l ₃ , it outputs a signal and returns the slope to its original state, giving it a curvature R _{2 .}
If the angle β is loosened after traveling, the curvature R ₁
You will be able to give Therefore, by sequentially repeating this operation, the molding material M can be curved into an arbitrary shape in two-dimensional directions.

Further, the molding material M can be subjected to vertical three-dimensional bending in the same manner as horizontal bending. This can be done by a pair of upper and lower clamping rolls 36 placed behind the presser roll 33 (see Figure 9), and when the distance traveled by the molding material is similarly detected using an encoder and a signal is issued, the drive shaft 36i rotates. By rotating by an angle θ, the lower roll 36b is displaced upward and the upper roll a is displaced downward relative to the molding material M. Due to this deviation, the molding material M has an upward curvature R ₄
Then, after detecting a predetermined travel distance in the same way as when bending in the horizontal direction, the angle θ is
By changing the curvature of the molding material, the molding material can be curved to a desired curvature. For example, if the angle θ is further increased, the molding material can be bent even with a curvature smaller than R ₄ ;
By decreasing , it becomes possible to change the curvature to a value larger than the curvature R ₄ . Note that depending on the cross-sectional shape, rigidity, etc. of the molding material, it may be better to rotate it around the support shaft 36c located on the upper side. Further, the rolls 36a and 36b are connected to each support shaft 36.
Since it can slide with respect to c and 36d, even if the horizontal bending curvature is small and the molding material approaches the disk 32, it can follow the deviation of the molding material M. Furthermore, even if the molding material M is rotated so that it is tilted at a certain angle with respect to the axial direction, the shaft holes of each roll 36a, 36b are formed wider toward the side ends, so that the molding material M is Becomes free to follow deviations. The molding material M that has been three-dimensionally bent in this way is cut by a cutting device having a die (not shown) located further behind the clamping roll 36 and fixed on the movable plate 34, and similarly by an _encoder . The length of ₂ + 2l ₃ is detected and a signal is sent to drive the cutting device, which cuts the material to a certain length. Note that the means for giving a predetermined angle to the movable plate 34 can be freely selected, such as a combination of pulse motors and gears instead of the oil cylinder, or a plurality of pneumatic cylinders connected and arranged in series.

Effects of the Invention As described above, according to the bending device according to the present invention, a molding material formed into a predetermined cross-sectional shape is continuously bent with various different curvatures in two-dimensional and three-dimensional directions. This makes it possible to produce a molding material that can be bent freely without any problems, can be applied to objects with a large variation in bending curvature, and has a simple structure and is inexpensive. Furthermore, as long as the molding material M with the same cross-sectional shape is used, l ₁ to l ₃ , R ₁ to _{R 3} , and R ₄ to _{R 5} can be changed without replacing the disk or presser roll.
For example, a windshield molding for a sedan and a windshield molding for a hardtop, which have slightly different bending shapes, can be efficiently produced using one processing device.

[Brief explanation of drawings]

Figure 1a is an explanatory diagram showing the two-dimensionally curved shape of the molding, Figure 1b is an explanatory diagram showing the three-dimensionally curved shape of the molding, and Figure 2 is the cross-sectional shape of the molding. 3a and 3b are side views and plan views of the bending device according to the present invention, FIG. 4 is a cross-sectional view of a die to be incorporated into the device, and FIG. 5 is a diagram showing a disk to be incorporated into the device. FIG. 6 is a front view showing a pair of upper and lower clamping rolls to be incorporated into the device, FIG. 7 a and b are plan views showing the operating state of the device, and FIG. Graphs showing the relationship between the two-dimensional bending of the bending and the running length, and FIGS. 9a and 9b are explanatory diagrams showing the operating state of the clamping rolls. M: Molding material, 32: Disc, 32
a: rotating shaft, 33: presser roll, 34: movable plate,
36: A pair of upper and lower holding rolls.

Claims (1)

[Scope of Claims] 1. A disk with a relatively large diameter that faces each other across the insertion interval of the molding material that is continuously fed out, and a disk with a relatively small diameter that presses the molding material against the circumferential side of the disk. Each of the presser rolls is rotatable, and the presser roll is installed on the surface of a movable plate that is pivoted coaxially with the rotating shaft of the disc so that it can swing back and forth, and the presser roll is rotated by the swinging of the movable plate. A bending device for a long molding, characterized in that it is configured to bend the axis of a molding material to a desired curvature by changing its position along the circumference of a disk. 2. Rotating a relatively large diameter disk that faces each other across the insertion interval of the continuously fed molding material, and a relatively small diameter presser roll that presses the molding material against the circumferential side of the disk. The presser roll is installed on the plate surface of a movable plate that is pivoted so as to be able to swing back and forth on the same axis as the rotation axis of the disc, and a pair of upper and lower rollers are installed on the plate surface of the movable plate behind the presser roll. Place the clamping roll,
The axis of the clamping roll is mounted so that it can be deviated back and forth, and the molding material clamping surface of each roll is mounted so that it can tilt and swing to the right or left. The axial line of the molding material is curved in a two-dimensional direction between the disk and the holding roll by changing the position along the circumference, and the axis of the molding material is also curved in a three-dimensional direction by deflection of the clamping roll. This is a bending device for long moldings.