JPH059173B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a roll forming machine, and particularly to a roll forming machine that can bend and form a plate material for processing into an arc or cylindrical shape having a desired diameter and shape. This invention relates to a roll bending machine consisting of rolls (hereinafter referred to as a two-roll bending machine).

[Prior Art] Generally, a roll forming machine that bends and forms a plate material into an arc shape supplies a processing plate material such as a metal plate between a plurality of rotatably driven rolls, and these rolls bend the plate material into an arc shape. It is bent into a cylindrical shape and usually consists of three rolls. A typical example is the "bending roller device" disclosed in Japanese Utility Model Publication No. 7326/1983.

A conventional two-roll forming machine has been proposed in order to reduce the number of parts for this three-roll bending roller device, thereby lowering the cost, and to enable delicate control of the bending force.

A conventional two-roll bending machine consists of two rotatable rolls that are in contact with each other, with one roll (hereinafter referred to as
An adjustable pressing force is applied to one roll (hereinafter referred to as a pressed roll) by the other roll (hereinafter referred to as a pressing roll).

The process of processing a plate material into an arc shape or a cylindrical shape using this two-roll bending machine will be explained.

First, the press roll is rotating together with the pressed roll while pressing the pressed roll. When a plate material to be processed is inserted between the two rolls rotating under pressure, a pressing force is applied from the pressure roll side to the pressed roll side on both surfaces of the plate material.
As a result, an inwardly converging force is applied to the surface of the plate material on the side of the pressed roll. Due to this convergence force, the workpiece is pressed and bent into an arc shape in the direction of winding the pressed roll, and is plastically deformed to obtain a molded product.

In order to obtain a molded product with a small diameter by the conventional process using the conventional two-roll bending machine, the diameter of the pressed roll may be made small. Furthermore, in order to obtain a molded product with a large diameter, the diameter of the pressed roll may be increased. In this way, in order to obtain the desired curvature of the molded product, several types of pressed rolls must be prepared depending on the curvature.

By the way, pressed rolls are selected not only based on the curvature of the molded product, but also due to differences in the shape, material, hardness, etc. of the processed material, such as width and thickness. Requires multiple copies.

In other words, the radius R1 of the processed material during forming,
The relationship between the radius R2 after spring back (outward restoring force of the circular arc) after the forming process is as follows: M is the bending moment applied to the workpiece, E is the longitudinal elastic modulus, and I is the second moment of area. Then, the relationship expressed by the formula 1/R2=1/R1-M/E·I is established.

In this case, the bending moment M is the width of the workpiece
Shape such as thickness, material, hardness, desired diameter size,
It is a variable that changes depending on the work hardening index, plasticity coefficient, etc. Further, the modulus of longitudinal elasticity E is a variable that changes depending on the material of the workpiece, and the moment of inertia I is a variable that changes depending on the shape of the workpiece, such as the width and thickness. Therefore, the desired radius after springback
In order to obtain a molded product of R2, the radius R1 of the workpiece, i.e. the radius of the pressed roll, must be We need to change the radius.

[Problems to be Solved by the Invention] However, the conventional roll forming machine described above has the following problems.

First, in order to select and determine the pressed roll,
The optimal one must be selected by taking into account the various factors mentioned above. Therefore, it is necessary to prepare a large number of replacement press rolls having different diameters, and the selection and adjustment of the press rolls is complicated.

In addition, in reality, after the desired bending radius for a mass-produced molded product is determined, the pressed roll is manufactured with the radius matched to the molded product, and it takes a considerable amount of time to obtain the optimal one. Not only was it necessary, but it also required considerable experience and skill.

Therefore, when processing plate materials using the above-mentioned conventional roll forming machine, it requires many years of skill and experience to select the pressed roll with the optimum radius for the processing operation, and it is difficult to increase the flexibility of the processing operation. In addition to chipping, there was also the problem that roll processing of various curvatures could not be performed on the plate material.

An object of the present invention is to provide a curvature adjustment member on the pressed roll side of a two-roll forming machine that moves the bending contact point on the converging side surface of the plate material, thereby making it possible to arbitrarily change the curvature of the bending process on the workpiece. Another object of the present invention is to provide a roll forming machine that can be operated without requiring skill or experience.

[Means for Solving the Problems] In order to solve the above-mentioned problems, a roll forming machine for bending and forming a plate material into an arc shape according to the present invention has a roll forming machine that bends and forms a plate material into an arc shape. In a roll that rotates and presses the plate material with the circumferential surfaces of both rolls, the plate material is bent into an arc shape in the direction of winding it around one of the rolls. a curvature adjustment member installed in parallel with the roll and whose rotation is adjusted separately from the rotation of the roll and provided on the exit side where the plate material is released from the pressed state; and a curvature adjustment member provided on the end side of the press roll. and a support mechanism for the curvature adjusting member, which rotates the curvature adjusting member in the circumferential direction of the pressed roll and stops the curvature adjusting member at an arbitrary position.

[Function] The invention according to this application relates to a roll forming machine that bends and forms a plate material having the above configuration into an arc shape, so the relative position of the curvature adjustment member with respect to the pressed roll is adjusted by operating the support mechanism. By adjusting the curvature of the plate material, it is possible to obtain the desired value and set the processing curvature of the plate material to the desired value. By being able to change the position of the adjusting member in this way, the pressing member that comes into contact with the inner circumferential surface of the plate material can be adjusted to either a large diameter or a small diameter without switching the pressed roll.

[Embodiments] Hereinafter, preferred embodiments of a roll forming machine for bending and forming a plate material into an arc shape according to the present invention will be described in detail with reference to the accompanying drawings.

1 to 4 and 10 to 14 show a first embodiment of the present invention.

In FIG. 1, a roll forming machine 10 supports a lower press roll 22 equipped with urethane rubber, an upper press roll 24 made of a rigid body, and a press roll 22 so as to be vertically movable and rotatable. It is generally composed of a frame 12 that rotatably supports a pressed roll 24.

The frame 12 has a base, a stay, etc., and also includes stands 14 and 16 that support both ends of the upper and lower rolls 22 and 24.

Both ends 224 and 226 of the pressure roll 22 are
The supporting sliding members 114 and 116 are respectively rotatably supported by roller bearings fitted into them. The supporting sliding members 114 and 116 are connected to the frame 12.
It is supported vertically movably by guide rails provided on stands 14 and 16. Support sliding members 114 and 11 that support the pressure roll 22
6 is movable up and down by the action of a fluid pressure cylinder, and the shaft end 2 of the press roll 22
24 is configured to be rotated by driving a motor.

As shown in FIG. 3, the pressed roll 24 is rotatably supported by a support shaft 240 via bearings 2a and 2b.

The shaft end 244 of this support shaft 240 is connected to the stand 1
Bearing housing 30 provided on the top of 4
The other shaft end 246 is fitted into a bearing 244a provided inside, and the other shaft end 246 is fitted into a bearing 246 provided outside.
It is removably supported by a support hole in the upper end of the drop end member 56 via a. The lower end of the drop end member 56 is pivotally supported by a pivot support pin, and is configured to be able to be attached to and detached from the shaft end 246 of the support shaft 240 by the action of a fluid pressure cylinder, and to be able to pivot freely.

The support shaft 240 has support rings 264 and 26 as support mechanisms on the outside of both ends of the pressed roll 24.
6 is fitted, and its outer peripheral portion supports a pressing member 26 as a curvature adjustment member made of a plate-shaped steel material with a cross section shaped like a half-moon. Support rings 264 and 266 are fixed to support shaft 240 by key 11.

As shown in FIGS. 2 and 4, the support shaft 240
A worm gear 166 is attached to the end 244 on the side of the stand 14, and a worm 167 is provided to mesh with the worm gear 166. The worm gear 166 and the worm 167 are rotated by a motor or a handle wheel 167a (not shown) in order to change the curvature of the plate material to be processed even during the pressing operation of the molded product against the pressing member 26. It is configured to be adjustable.

Next, the operation of the roll forming machine of the first embodiment having the above configuration will be explained.

First, the drop end member 56 is rotated by the fluid pressure cylinder, and the bearing 246 of the pressed roll 24 is supported by the support hole formed on the upper end side of the drop end member 56.
Grasp a. Next, the press roll 22 is moved from below to above by operating the cylinder, and the press roll 22 is pressed against the pressed roll 24 . When the end of the plate material for processing is inserted into the contact point between the rolls 22 and 24 in the pressed state and the press roll 22 is rotated by the rotation of the motor, the plate material is drawn between the rolls 22 and 24. Then, the pressed roll 24 also starts rotating. By continuing to rotate, the plate material begins to curve with the pressed roll 24 inside, and is ejected from the opposite side of the insertion port between the rolls 22 and 24 while being bent into an arc shape.

During this processing operation, the radius of the plate material on the side of the pressed roll 24 is increased by adjusting the position of the pressing member 26 as the curvature adjustment member with respect to the pressed roll 24 by rotating the handle wheel 167a or by the motor. . As a result, the contact point between the plate material and the pressing member 26 is different from that before the position of the pressing member 26 is moved, thereby changing the curvature of the plate material.

By interposing the pressing member 26 between the rolls, the workpiece is pushed and spread out to the side opposite to the side to be pressed and bent, so the curvature of the sheet material when the pressing member 26 is in contact with it is The curvature becomes gentler than when it is not used, and it becomes possible to give different curvatures to different parts even when rolling a single plate material.

In addition, in the first embodiment described above, the pressed roll 24 was explained as having the bearings 2a and 2b supported by the support shaft 240 at both ends thereof, but the present invention is not limited thereto. for example,
As shown in FIG. 5, a bearing 2c may be provided between the bearings 2a and 2b to reduce distortion of the pressed roll 24.

Furthermore, in the first and second embodiments described above, the pressed roll 24 has been described as being composed of a rotating outer peripheral side roll member and a center side support shaft 240, but the invention is not limited thereto. It never happens. That is, as in the third embodiment shown in FIGS. 6 and 7, the pressed roll 24 is made of one rigid body, and the bearing 246a in the support ring 266 is supported by the drop end member 56. It's okay. The pressing member 26 is a support ring 26
6 and block 268, and
The threaded rod 134 attached to the block 268 and supported by the support member 144 and the handle wheel 16
7a adjusts its rotational position, making it possible to change its curvature in the process of roll forming the plate material, similarly to the first embodiment.

Furthermore, although the roll forming machines of the first to third embodiments have all been described as having the pressing roll 22 and the pressed roll 24 having horizontal rotation axes, the present invention has such a configuration. However, the present invention is not limited to this, and the pressing roll 22 and the pressed roll 24 may be configured to have rotational axes in the vertical direction, as in the fourth embodiment illustrated in FIGS. 8 and 9.

In FIG. 8, the roll forming machine includes a press roll 22 that is rotatably cantilevered downward from an upper frame 12, and a pressed roll 24 that is also supported by the frame 12. The pressure roll 22 has a notch in the urethane elastic body provided on the outer circumferential side. The basic structure and operation of this vertical roll forming machine are disclosed in the advertisement publication of Japanese Patent No. 584855, so the explanation thereof will be omitted here.

In the device having the basic configuration described above, a pressing member 26 is rotatably provided on a portion of the outer peripheral side of the pressed roll 24. This pressing member 26
is fixed to a support ring 264 attached to the pressed roll 24, and a worm gear 166, a worm 167, and a handle wheel 167a are provided on the outer periphery of the ring 264, respectively.

In the fourth embodiment described above, it is assumed that both the press roll 22 and the pressed roll 24 rotate to press the plate material and perform roll forming. Press roll forming may be performed while rotating and guiding.

Note that the pressing member 26 is not limited to the sector-shaped cross section as described above, but may be roll-shaped.

Furthermore, various cross-sectional shapes such as semicircular, U-shaped, V-shaped, and flat plate shapes are conceivable.

In short, in a two-roll forming machine, a curvature adjustment member is attached to the pressed roll to change the curvature of the plate rolled into the pressed roll during roll forming while the press roll and the pressed roll press the plate. As long as the desired curvature is imparted to the plate material, the intended object of the present invention can be achieved.

A specific example of processing a plate material using a roll forming machine having the above configuration and operation will be described below with reference to FIGS. 10 to 14. In each case, the explanation is given using the configuration of the roll forming machine according to the first embodiment, but the same processing can be performed using the configuration of the roll forming machine according to the second to fourth embodiments. Needless to say.

The pressing member 26 in the roll forming machine 10 according to the first embodiment shown in FIGS. 1 to 4 can perform involute forming, spiral forming, elliptical forming, round forming, etc. on the plate material by appropriately moving its position. It is possible to roll-form plate materials having various irregular curvatures such as rounded triangles and squares.

In FIG. 10, position A is the pressure roll 22
The position of the contact point between the pressed roll 24 and the pressed roll 24 in the first processing step is shown. Position B is shifted by 90 degrees from the position A on the outer circumferential surface of the pressed roll 24, and indicates the contact position in the next processing step.

FIG. 11 is a schematic diagram showing an involute molded product. In order to obtain such a molded product, the pressing member 26 is initially positioned near point B, and then gradually moved toward point A during the molding process. By rotating the pressing member 26, a roll molded product having such a shape can be obtained.

FIG. 12 shows the processing steps for obtaining an elliptical cylindrical molded product. By alternately repeating the processing steps at points A and B twice, such an elliptical molded product is obtained.

FIGS. 13 and 14 show specific examples for obtaining rounded triangles and squares, respectively. In both figures, no matter where the molding process is started, each molded product can be obtained by sequentially repeating the rotation and fixation of points A and B as shown.

[Effects of the Invention] As described above in detail, the roll forming machine according to the present invention provides the following various effects.

Since there is no need to replace and use a large number of press rolls that have been manufactured in advance, not only is work efficiency improved, but experience and skill are no longer required when manufacturing press rolls and roll forming plate materials. It is possible to simplify the work content and reduce work costs.

By rotating and fixing the curvature adjustment member, a desired processing position for the plate material can be set, and thereby a roll-formed product with a complicated shape can be manufactured from the plate material.

Furthermore, even if not only the shape but also the thickness, width, material, hardness, etc. of the plate material are inconsistent, the desired processing position can be obtained by adjusting the position of the adjustment member, providing flexibility in the processing method. I can do it.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the overall configuration of a roll forming machine according to a first embodiment of the present invention, FIG. 2 is a perspective view showing main parts of the roll forming machine according to the first embodiment, and FIG.
The figure is a sectional view showing the detailed structure of the pressed roll in the roll forming machine of the first embodiment, and FIG. 4 is a side view showing the rotation fixing means of the forming machine of the same embodiment.
FIG. 5 is a sectional view showing a pressed roll of a roll forming machine according to a second embodiment of the present invention, and FIGS.
The figures are an overall perspective view and a sectional view of essential parts of a roll forming machine according to a third embodiment of the present invention, and FIGS. 8 and 9 are overall perspective views showing a roll forming machine according to a fourth embodiment of the invention, respectively. and main part sectional view, 10th
Figures 1 to 14 are schematic explanatory diagrams showing specific examples of processing a plate material using the roll forming machine having the configurations of the first to fourth embodiments. 10... Roll forming machine, 22... Press roll,
24... Pressed roll, 26... Pressing member (curvature adjustment member), 56... Drop end member, 16
6...worm gear, 167...worm, 16
7a...Handle wheel (support mechanism).

Claims (1)

[Claims] 1. Rotation of a large-diameter press roll rotates a small-diameter pressed roll that presses against it, and by pressing the plate material with the circumferential surfaces of both rolls, the plate material is wound around one of the rolls. In a roll forming machine that bends the sheet material into an arc shape in such a direction, the roller is placed in parallel with the roll and comes into contact with the inner peripheral surface of the sheet material, and its rotation is adjusted independently of the rotation of the roll, so that the sheet material is released from the pressed state. A curvature adjustment member provided on the exit side to be released; and a curvature adjustment member provided on the end side of the pressed roll to rotate the curvature adjustment member in the circumferential direction of the pressed roll and stop it at an arbitrary position. A roll forming machine for bending a plate material into an arc shape, the roll forming machine comprising: a support mechanism for the curvature adjusting member configured to bend the plate material into an arc shape.