JPH0417729B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll forming apparatus for cold working a plate material.

For example, in order to form various car sashes and the like from a plate-shaped material, it is common to gradually deform the plate-shaped material using a multi-stage roll forming device to obtain a desired cross-sectional shape. FIGS. 1 and 2 show a conventional roll forming apparatus of this kind, in which a plate material 30 is unwound from a coil 2 supported by a reel stand 1, and an upper roll supported by left and right fixed stands 3, respectively. By passing between the pieces 4 and the lower roll pieces 5 one after another, the machining progresses as the roll pieces 4 and 5 change in shape due to the stand. However, in the conventional roll forming apparatus, the shaft 5a of the lower roll piece 5 is supported by a bearing 6 fixed to the fixed stand 3, and the shaft 4a of the upper roll piece 4 is supported by a bearing 6 fixed to the fixed stand 3.
The material 30 is supported by a bearing 8 that can be adjusted vertically with respect to the fixed stand 3 by an adjustment screw 7, and the distance between the upper and lower pair of roll pieces 4 and 5 is fixed during processing. There was a problem that it was difficult to adequately deal with variations in plate thickness. In other words, if the distance between the axes of the roll pieces 4 and 5 is constant, the material 3
If the plate thickness of the roll piece 0 is larger than a predetermined value, the shafts of the roll pieces 4 and 5 are bent, and if it is smaller, the material 30
The pressure applied to the roll pieces 4 and 5 may become insufficient, or the roll pieces 4 and 5 may become separated from the material 30. In the former case in particular, there is a risk that the roll forming equipment will stop operating and the equipment itself may be damaged.Therefore, there is a tendency for the plate thickness of the conventional material 30 to be made tighter on the + side and looser on the - side. When the plate thickness is set in this way, there is a problem in that many processing defects occur due to the roll pieces and the material not being in close contact with each other. Furthermore, in conventional roll forming equipment, the distance between the pair of roll pieces 4 and 5 must be adjusted very precisely using the adjustment screw 7 every time the final formed shape, material thickness, etc. change. First, there was a problem that this adjustment required a lot of time.

The present invention was made in order to solve this problem, and one of the pair of roll pieces is made into a fixed roll piece whose axis position does not change, while the other roll piece is made to have a displacement that allows it to approach the fixed roll piece. It is characterized in that it is a movable roll piece and is further provided with a pressing means for pressing the displaceable roll piece towards the fixed roll piece. The pressurizing means includes a shaft protruding from both sides of the displaceable roll piece, a support arm pivotally connected to the machine frame so as to be openable and closable, and a support groove formed on the support arm into which the shaft of the displaceable roll piece fits. , and a cylinder device that presses the support arm toward the fixed roll piece.

According to this press forming apparatus, it is possible to eliminate the complexity of adjusting the distance between the axes as in the conventional apparatus, and to prevent processing defects.

The invention will now be described with reference to the illustrated embodiments. FIG. 3 shows an embodiment in which the present invention is applied to two roll forming machines out of a large number of roll forming machines installed in succession.
12 is erected and fixed, and this fixed stand 12,1
Bearings 1 of fixed roll pieces 13 and 13 are respectively attached to 2.
4 and 14 are provided. The fixed stand 12 and the bearings 14 are provided on both sides of the fixed roll piece 13, and each bearing 14 rotatably supports the fixed roll piece 13 at a fixed position.

A support stand 15 is also fixed to the machine frame 11 on the outer side of each of the two fixed stands 12.
A support arm 17 is pivotally connected to the upper end of the support stand 15 by a pin 16 so as to be openable and closable. The pair of support arms 17 extend to the center of the two fixed stands 12, and their free ends are connected to the connection links 18 via link pins 19, respectively. A pressure rod 21 is further pivotally connected to the coupling link 18 via a pin 20, and this pressure rod 21 passes between the fixed stands 12, 12 and hangs below the machine frame 11, and its lower end A roller 22 is supported which projects in a direction perpendicular to the paper plane of FIG. A tapered pressure surface 25 fixed to a piston rod 24 of a hydraulic cylinder device 23 comes into contact with the upper surface of this roller 22. In addition, the above support stand 1
5. The support arm 17 and the pressure rod 21 are connected to the fixed roll piece 1 in the same way as the fixed stand 12 and the bearing 14.
Provided on both sides of 3. The hydraulic cylinder device 23 and the tapered pressure surface 25 may be similarly provided on both sides, but if a wide tapered pressure surface 25 is used,
The number of hydraulic cylinder devices 23 can also be only one.

A support groove 27 is formed on the lower surface of each of the support arms 17. The support groove 27 is located directly above the fixed roll piece 13 when the support arm 17 is laid down on the fixed roll piece 13. This support groove 27 is open at the bottom, and a shaft 29 protruding from both sides of the roll piece 28 is fitted and supported in the support groove 27 of the support arm 17 located on both sides. Therefore, this roll piece 28 constitutes a displaceable roll piece that can be displaced toward the fixed roll piece 13 and moves the support arm 17 downward via the tapered pressure surface 25 of the hydraulic cylinder device 23, the roller 22, and the pressure rod 21. When pulled, this displaceable roll piece 28 is pressed against the fixed roll piece 13 side.

This apparatus with the above configuration, like a normal roll forming apparatus, holds a plate material 30 between a pair of fixed roll pieces 13 and a displaceable roll piece 28, and uses a drive means (not shown) to move the fixed roll piece 13 (and the displaceable roll piece 28). By rotationally driving the roll piece 28), the plate material 30 is formed into a roll. During this molding, the tapered pressure surface 25 is made to protrude by the hydraulic cylinder device 23 and the roller 22 is pushed downward. Then, the pressure rod 21 and the connecting link 1
Since the free end of the support arm 17 is pulled downward via the support groove 27 and the shaft 2
9 to the displaceable roll piece 28.
Therefore, the plate-shaped material 30 comes into contact with the fixed roll piece 13 and the displaceable roll piece 28 with sufficient pressure, and is roll-formed into the shape of the roll piece. This molding can be performed satisfactorily even if there is slight variation in the thickness of the plate material 30, and the pressurizing force can be adjusted by controlling the pressure of the working fluid supplied to the hydraulic cylinder device 23. The support groove 27 is open only at the bottom, and the shaft 2
9, the displaceable roll piece 28 does not move in the feeding direction of the plate material 30 during this processing.

To replace the displaceable roll piece 28, use the link pin 1.
This can be easily done by removing the support arm 9 and opening the support arm 17 as shown by the chain line in FIG. The fixed roll piece 13 may be replaced in the same manner as before.

The pressure of the working fluid supplied to the hydraulic cylinder device 23 can be controlled depending on the thickness of the plate material 30. That is, before the plate material 30 enters between the fixed roll piece 13 and the displaceable roll piece 28, a plate thickness detector 32 is installed, and the hydraulic cylinder device 23 is installed in accordance with the output of the plate thickness detector 32.
By controlling the pressure of the working fluid supplied to the roller, more ideal roll processing can be performed.

In the above embodiment, the roller 22 and the tapered pressure surface 25 are used to pull the pressure rod 21 downward by the hydraulic cylinder device 23, but the pressure rod 21 may be directly pulled by the hydraulic cylinder device 23. good. Furthermore, in the above embodiment, the pair of support arms 17 are pressurized by one hydraulic cylinder device 23, which simplifies the mechanism, but it is clear that each support arm 17 may be pressurized independently. be.

As described above, in the roll forming apparatus of the present invention, one of the pair of roll pieces through which the plate-shaped material passes is a fixed roll piece, and the other is a displaceable roll piece that is accessible to the fixed roll piece, and the displaceable roll a shaft in which the piece protrudes from both sides of the displaceable roll piece;
A support arm pivotally connected to the machine frame so that it can be opened and closed, a support groove formed in this support arm into which the shaft of the displaceable roll piece fits, and a cylinder device that presses this support arm toward the fixed roll piece are used to apply pressure. Since the pressure is applied, even if there is variation in the thickness of the plate material, the contact pressure between the roll piece and the material will not become insufficient, thus preventing processing defects caused by this. I can do it. Furthermore, since adjustment of the distance between the axes of the pair of roll pieces is substantially unnecessary, the time required for adjustment in the past can be significantly shortened.

[Brief explanation of drawings]

FIG. 1 is a schematic front view showing a general configuration example of a roll forming apparatus, FIG. 2 is a sectional view taken along the - line in FIG. 1, and FIG. 3 is a front view showing an embodiment of the roll forming apparatus of the present invention. FIG. 4 is a perspective view showing an example of the shape of the displaceable roll piece. 11...Machine frame, 12...Fixed stand, 13...Fixed roll piece, 14...Bearing, 15...Support stand, 1
7... Support arm, 21... Pressure rod, 23... Hydraulic cylinder device, 27... Support groove, 28... Displaceable roll piece, 30... Plate material.

Claims (1)

[Scope of Claims] 1. In a roll forming device that passes a plate-shaped material between a pair of upper and lower roll pieces to change the shape of the material according to the shape of the roll pieces, one of the pair of roll pieces is moved to the position of its axis. The roll piece is a fixed roll piece that does not change, the other roll piece is a displaceable roll piece that can approach the fixed roll piece, and a pressure means is provided to press the displaceable roll piece toward the fixed roll piece. The pressurizing means includes a shaft protruding from both sides of the displaceable roll piece, a support arm pivotally connected to the machine frame so as to be openable and closable, and a support groove formed in the support arm into which the shaft of the displaceable roll piece fits. A roll forming apparatus comprising: a cylinder device that presses the support arm toward the fixed roll piece. 2. The roll forming apparatus according to claim 1, wherein the pressurizing force of the cylinder device of the pressurizing device is controlled by the output of a plate thickness detector that detects the thickness of the plate material.