JPH0242286B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Application and Summary of the Invention) The present invention relates to a roll bending method using an elastic material such as urethane rubber. A pair of relatively small lower rolls are disposed in parallel, a flat elastic material is interposed between the upper roll and the lower roll, and the workpiece is pressed between the elastic material and the upper roll. However, by curving the roll, the range of curvature that can be changed by adjusting the interval between the upper roll and the lower roll can be greatly expanded.

(Prior art and its problems) Roll bending machines using urethane rolls (hereinafter simply referred to as urethane roll machines) have already been disclosed in Japanese Patent Publication No. 41-13974 or Japanese Patent Publication No. 44-26545.
There is something disclosed in the publication No. The former is based on the principle of a so-called urethane roll bending machine, and the latter is such that the pressure applied to the urethane layer of the urethane roll acts efficiently on the workpiece.

In all of these conventional methods, the workpiece A is bent by the action shown in FIG.

The upper roll 1 is pushed into the urethane rubber layer 21 of the urethane roll 20, and as shown in the figure,
When the plate A to be processed is fed between both rolls, the plate A to be processed is bent into a curvature determined by the relationship with the upper roll 1 due to the pressure accompanying the deformation of the urethane rubber layer 21.

In this conventional method, the urethane rubber layer 21 is pressed over a certain width in the bending area, so even if there is an opening or the like in a part of the workpiece A, the processing curvature will be reduced in this part. It has the advantage of not changing suddenly. This point can be said to be a particularly superior advantage compared to the conventional three-roll method.

As described above, in the urethane roll machine, the upper roll 1 bites into the urethane rubber layer 21 of the urethane roll 20 to perform continuous bending, and this processing curvature is determined by the pressing force of the urethane roll 20 and the upper roll 1 determined by the diameter of

Therefore, even under the condition that the diameter of the upper roll 1 is constant, the processing curvature can be adjusted by adjusting the amount of penetration of the upper roll 1 into the urethane rubber layer 21, and as shown in FIG. When the amount of penetration of the roll 1 is reduced, the machining curvature becomes smaller.

However, in this conventional processing, the range in which the curvature can be adjusted by changing the amount of penetration is extremely small. In particular, when processing a cylindrical body with a diameter significantly larger than the diameter of the upper roll 1, that is, when the amount of penetration of the upper roll 1 is set to be small, the variation in the processing curvature becomes large.

This is because, as shown in FIG. 12, when the amount of penetration of the upper roll 1 is reduced, the contact range between the upper roll 1 and the urethane rubber layer 21 becomes extremely small. That is, the range of pressure that acts on the bending area from the urethane rubber layer 21 is extremely reduced.

In order to alleviate this inconvenience to some extent, the method disclosed in Japanese Utility Model Application Publication No. 51-111941 can be adopted.

In this product, since the elastic material layer that contacts the forming roll corresponding to the upper roll is flat, the contact range with the forming roll is greater than that of the conventional example where the elastic material layer is cylindrical. However, in the former case, the upper roll is pushed in such a manner that the elastic material layer is pressed down, so the contact range cannot be set sufficiently large. This is because the contact range differs from the above-mentioned conventional method only due to the difference in whether the surface of the elastic material layer is a cylindrical surface or a flat surface.

(Problem) The present invention aims to solve the above-mentioned problem by pressing an elastic material such as urethane rubber against the upper roll 1, feeding the workpiece A into the press-contact part, and turning the workpiece A into a circle with a constant curvature. ``Roll bending method for bending into an arcuate cross section''
The object of the present invention is to increase the range of contact between the upper roll 1 and the elastic material, thereby increasing the bending rate range in which the upper roll 1 can be bent without changing it.

(Means) The technical means of the present invention taken to solve the above problem is as follows: ``A pair of lower rolls 3, 3 with a relatively small diameter are disposed below the upper roll 1 in parallel with the upper roll 1. In addition, the lower rolls 3, 3 are provided so as to be able to approach and separate from the upper roll 1, and to adjust the closest position, and a plurality of support rolls 33, 33 are provided to prevent the center of the lower rolls 3, 3 from deflecting. The lower rolls 3, 3 are brought into contact with each lower roll 3, and the supporting position of the lower rolls 3, 3 by this support roll 33 is adjustable, and the interval between the lower rolls 3, 3 is set smaller than the diameter of the upper roll 1, so that the upper roll 1, a flat elastic plate 22 is interposed between the lower rolls 3, 3.
The workpiece plate A is pinched between the elastic plate 22 and the upper roll 1 by adjusting the closest position to the upper roll 1, and the elastic plate 22 is pressed by the rotational drive of the upper roll 1.
and the plate A to be processed is fed between the lower rolls 3 and 3.

(Operation) The above technical means of the present invention operates as follows.

In the bending section, the upper roll 1 is located above the middle of the lower rolls 3, 3 which are arranged in parallel at a relatively small interval, forming a so-called three-roll structure. Therefore,
Even in a state where the elastic plate 22 is not interposed, the workpiece plate A can be bent into an arcuate cross-section by using only the three rolls. The applied curvature is determined by adjusting the closest position of the lower rolls 3, 3 to the upper roll 1.

The elastic plate 22 is interposed between the three rolls having the above relationship, and the workpiece plate A is pinched between the elastic plate 22 and the upper roll 1. Therefore, between these rolls, the elastic plate 22 is also in a bent state. Therefore, the contact range of the elastic plate 22 bent along the surface of the upper roll 1 with the workpiece plate A is significantly wider than that in the case where the upper roll 1 is pressed in a manner that reduces the elastic material layer. Become.

Since the diameters of the upper roll 1 and the lower rolls 3, 3 are relatively small, during bending, a force that bends the lower rolls 3, 3 downward is applied to the central part of the lower rolls 3, 3. Since the force is blocked by the support rolls 33, the bending process proceeds without the central part of each lower roll 3 being bent downward.

(Effects) Since the present invention has the above configuration, it has the following unique effects.

The range of contact between the elastic plate 22 and the workpiece plate A is much wider than when the upper roll 1 is pressed in a manner that reduces the elastic material layer. , 3, the range of curvature that can be machined is widened by adjusting only the closest position. In other words, it is possible to process from a large curvature to a small curvature with one upper roll 1.

Furthermore, even when processing objects with the same curvature, the accuracy of the bending curvature is improved compared to the conventional method described above.

Furthermore, since the elastic plate 22 side is not driven, the driving force required for bending is smaller than that of the known technology described above.

In addition, the elastic plate 22 is attached to the upper roll 1 and the lower rolls 3, 3.
Since the elastic plate 22 is only interposed between the elastic plate 22 and the elastic plate 22, it is only necessary to replace the elastic plate 22 when the elastic plate 22 deteriorates, and the replacement of the elastic plate 22 is also extremely simple.

(Example) Examples of the above two inventions are shown below in Figures 1 to 1.
This will be explained based on Figure 0.

The first embodiment shown in FIGS. 1 to 5 has an overall configuration as shown in FIG. 2.

This roll bending device includes an upper roll 1 which is rotatably supported at one end by a container body 4 and supported by a swing arm 5 at the other end, and an upper roll provided below the upper roll and rotatably supported at both ends. A pair of supported lower rolls 3, 3 are provided, and the upper roll 1 is rotationally driven by a first drive device 11, and the lower rolls 3, 3 are rotationally driven by a second drive device 34, respectively.

The relationship between the upper roll 1 and the lower rolls 3, 3 is as shown in FIGS. 2 and 3, and the lower roll 3,
3 has a small diameter and the mutual spacing is set small. This is because when the workpiece is directly inserted between the upper roll 1 and the lower rolls 3 and 3, even if there is an opening in a part of the workpiece, the opening is This is to prevent sudden changes in curvature from occurring.

In addition, the lower rolls 3, 3 have a container body 4 at both ends thereof.
A pair of bearing bodies 31 that can be raised and lowered against the
It is rotatably supported by 31, and further,
In the central part, support rolls 33, 33 of the support body 32 are similarly coupled to the container body 4 so as to be able to move up and down.
It is rotatably supported by. The arrangement of the support rolls 33, 33 is as shown in FIGS. 2 and 3, and the three support rolls 33, 33, 33 are arranged so as to sandwich the lower part of each lower roll 3, 3.
are rotatably provided so as to protrude from both sides of the support body 32.

Therefore, the lower rolls 3, 3 are supported at three points: both ends and the center, and this support system prevents the lower rolls 3, 3 from being bent.

The bearing bodies 31, 31 and the support body 32 described above are
Both are connected to a lever crank mechanism as a lifting means. This mechanism includes a crank portion 62 of a drive shaft 61 that is rotated by a certain angle by a third drive device 60.
It consists of a rod 63 that is paired around the lower end of the crank part, and the upper end of a threaded shaft 64 provided on this rod is connected to the bearings 31, 31 or the support 3.
It is swingably connected to the lower part of 2. (See FIG. 3) Therefore, the third drive device 60 drives the drive shaft 6.
1 is rotated forward by a certain angle, the crank part 62, the rod 63, and the screw shaft 64 are rotated accordingly.
Due to the interlocking relationship, the bearing bodies 31, 31 and the support body 32 are synchronously and integrally lifted up, and are lowered by the reverse rotation of the drive shaft 61.

Furthermore, this rod 63 has the following features as shown in FIG.
A worm 65 and a worm wheel 66 are built in, and the worm wheel 66 is coupled around the rod 63 and is threaded to the lower part of the screw shaft 64. Also, the shaft 67 of this worm 65
The three rods are connected by connecting shafts 68, 68, and the connecting portion between the connecting shaft 68 and the shaft 67 is
A dog clutch 69 is interposed. This meshing clutch can be set in a meshed state and a free state, and the meshing angle between the shaft 67 and the connecting shaft 68 can be adjusted.
Incidentally, one of the three worms 65, 65, 65 described above is interlocked with the handle 7 provided on the side of the body 4 via an interlocking mechanism and a gear mechanism 72, which are provided with universal joints 71, 71. ing.

Therefore, by rotating the handle 7, the three worms 65, 65, 65 are rotated integrally, and the highest positions of the lower rolls 3, 3 are changed.
Further, by adjusting the meshing relationship of the meshing clutches 69, 69, the bearing bodies 31, 31 and the support body 3
The highest position of 2 will be changed separately.

For example, the support position by the central support body 32 is
When setting the position relatively higher than that of the other bearing bodies 31, 31, the meshing clutches 6 at both ends of the central shaft 67 corresponding to the support body 32
9, 69 in the free state, rod 63 in the center
All you have to do is rotate the worm 65 built into the rod 63 in a predetermined direction.
The lower rolls 3, 3 are supported in an upwardly curved state (center protruding state) at the center. Thereafter, when the dog clutches 69, 69 are engaged to the initial state, the uppermost position of the lower rolls can be adjusted using the handle 7 while the lower rolls 3, 3 remain in the above-mentioned state.

Furthermore, in the above-described apparatus, support tables 40, 4 are provided across the entire width of the upper roll 1, at the front and rear thereof.
0, and a rectangular urethane rubber plate as the elastic plate 22 is placed on the front support table 40. The hardness of this urethane rubber plate is similar to that of the urethane rubber layer 21 of the conventional urethane roll 20, and the thickness is about 10 mm to 40 mm.

When this urethane rubber plate is inserted between the upper roll 1 and the lower rolls 3, 3 and the third drive means 60) is driven in normal rotation, the urethane rubber plate is pinched between the two rolls, and the upper roll 1 enters the urethane rubber plate in a certain amount. In this state, when the upper roll 1 and lower rolls 3, 3 are driven and the workpiece plate A is inserted,
As shown in FIG. 1, the plate A to be processed is bent into a cylindrical shape.

After that, when the air cylinder 51 provided on the side of the container body 4 shown in FIGS. 2 and 5 is operated to return, the swinging arm 5 comes off from the upper roll 1 as shown by the two-dot chain line in FIG. The end of the upper roll 1 is opened. As a result, the product opened in a cylindrical shape can be taken out.

Here, the amount of penetration of the upper roll 1 into the urethane rubber plate can be determined by rotating the handle 7, as described above. In addition, the lower rolls 3 and 3 are
By making the center protrude as shown in the figure, it is possible to prevent bending defects at the center portion, which tend to occur when bending with a small diameter. In the conventional urethane roll bending machine, it was impossible to make the urethane roll 20 protrude from the center, but according to the present invention, this inconvenience can be solved.

Next, regarding the support table 40, as shown in FIG. 7, a large number of rolls 41, 41 may be arranged in parallel on one plane, or as shown in FIG. The portions away from the rolls 3, 3 may be bent downward.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the first embodiment of the present invention, Fig. 2 is an overall front view of this embodiment, Fig. 3 is an explanatory diagram of the main part of the XX section, and Fig. 4 is an explanatory diagram of the Y-Y section. Main part explanatory diagram, Fig. 5 is a side view, Fig. 6 is an explanatory diagram when the lower rolls 3, 3 are in the centrally protruding state, Figs. 7 and 8.
The figure is an explanatory diagram of a modified example of the support table 40.
10 are explanatory diagrams of a conventional example. In the figure, 1... Upper roll, 2... Elastic material layer, 21... Urethane rubber layer, 22... Elastic plate, 3, 3... Lower roll, 40... Support table, 41... Roll.

Claims (1)

[Claims] 1. In a roll bending method in which an elastic material such as urethane rubber is brought into pressure contact with the upper roll 1, a workpiece plate A is fed into this pressure contact part, and the workpiece board A is bent into an arcuate cross section with a constant curvature. A pair of lower rolls 3, 3 with a relatively small diameter are arranged below the upper roll 1 in parallel with the upper roll 1, and the lower rolls 3, 3 are movable toward and away from the upper roll 1 and are A plurality of support rolls 33, 33 which are provided so as to be able to adjust the approach position and which prevent the central bending of the lower rolls 3, 3 are placed in opposition to each of the lower rolls 3, and the support rolls 3, 3 are supported by the support rolls 33. The position is adjustable, the interval between the lower rolls 3, 3 is set smaller than the diameter of the upper roll 1, and a flat elastic plate 22 is interposed between the lower rolls 3, 3 and the upper roll 1,
Adjusting the closest position of the lower rolls 3 and 3 to the upper roll 1, the workpiece plate A is pinched between the elastic plate 22 and the upper roll 1, and the elastic plate 22 is pressed by the rotational drive of the upper roll 1. and a roll bending method in which the workpiece A is fed between lower rolls 3, 3.