JP2002086216A - Bending apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bending apparatus capable of precisely, quickly and inexpensively bending a flat metal plate to a cylindrical shape and overlapping both end edges of a product obtained or bringing them into contact with each other. SOLUTION: The apparatus to bend the flat metal plate P to a cylindrical shape is provided with a rotary roller 4, a first press roller 16, which has an axial center (g) parallel to an axial center (g) of the rotary roller 4 and slides along a tangent of on a peripheral face of the rotary roller 4, a metal plate support base, which rotatably journals the first press roller at its one end and slides along the tangent direction, and a second press roller 28, which has an axial center (g) parallel to the axial center (g) of the rotary roller 4 and approaches the peripheral face of the roller 4, a tip (s) of the metal plate P, which is placed on the metal support base and is protruded from the first press roller 16, is positioned toward the rotary roller 4 rather than the axial center (g) of the second press roller 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for bending a flat metal plate into a cylindrical shape, and more particularly to a bending apparatus capable of overlapping or contacting both ends of a cylindrically bent product.

[0002]

2. Description of the Related Art When a cylindrical product is formed from a flat metal plate, generally, as shown in FIG. 5A, three rollers 32, 34, and 36 having nested peripheral surfaces are included. The bending apparatus 30 was used. In this device 30, the center of the roller 32 is movable relative to the left and right rollers 34, 36 as shown by the arrow. That is, in a state where the center roller 32 is separated in advance, as shown in FIG. 5B, a metal plate 37 whose tip 37a is bent in advance is inserted between the center roller 32 and the right roller 36, as shown in FIG. 5A, the metal plate 37 is pulled out from between the roller 32 and the left roller 34 by moving the axis of the roller 32 as shown by the arrow in FIG. 5A. However, in the above method, as shown in FIG. 5C, the molded product 37 has a substantially cylindrical shape as a whole, but a gap 39 is formed between the edges 38a and 38b by springback. For this reason, an accurate cylindrical shape cannot be obtained and it is difficult to perform welding or the like. In order to prevent such a situation, the metal plate 37 is
Although it may pass between 2, 34 and 36, there is a problem that the number of steps is increased and the cost is increased.

As shown in FIG. 5 (D), the vicinity of the center of a flat metal plate 40 and the vicinity of both sides thereof are pressed in opposite directions by a first press, and as shown in FIG. 5 (E). After forming an intermediate product 42 having a substantially W shape as a whole, the intermediate product 4
There is also a method in which the vicinity of the center and the vicinity of both sides thereof are pressed by a second press in opposite directions. However,
Also in this method, as shown in FIG.
Since only a cylindrical product 44 with an open space is obtained and a gap 48 is formed between the edges 46, 46 due to springback, it is difficult to perform welding. In particular, the metal plate 40
Springback is more likely to occur as the outer diameter of the product 44 increases with respect to the plate thickness. In addition, the two-stage press method requires two types of molds and has a low molding speed, so that there is a problem that processing cost is high and production efficiency is low.

Further, as shown in FIG. 5 (G), in a state where a metal plate 55 is in contact with a cylindrical core 50, as shown in FIG. 5 (H), an upper die 51 having a round groove 52 is provided. Is pressed to form an intermediate member 56 having an inverted U-shaped cross section, and as shown in FIG. 5 (I), a pair of horizontal molds 53, 5 having a round groove 54 symmetrically.
A so-called homing process of forming a product 57 having a circular cross section by bringing the product 3 closer to the right and left is also performed. But product 5
When the 7 is taken out from the horizontal dies 53, a gap 59 is formed in the cylindrical body 58 by springback as shown in FIG. 5 (J). In order to prevent this, a lower mold (not shown) symmetrical to the upper mold 51 can be further pressed to form a product 57 having no gap 59, but the number of steps is increased and the cost is increased. Moreover, since the radius grooves 52 and 54 of the upper die 51 and the horizontal die 53 are constant, there is a problem that it is necessary to arrange another upper die and a horizontal die to obtain products of different diameters.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems in the prior art, and enables a flat metal plate to be accurately and quickly and inexpensively bent into a cylindrical shape, and to obtain both ends of the obtained product. An object of the present invention is to propose a bending device capable of overlapping or contacting edges.

[0006]

According to the present invention, in order to solve the above-mentioned problems, a pair of pressing rolls are arranged near the peripheral surface of one rotating roll, and one of the pressing rolls is processed. It is made with the idea of being slidable together with a metal plate to be formed. That is, the bending device of the present invention is a device for bending a flat metal plate into a cylindrical shape, comprising a rotating roller, an axis parallel to the axis of the rotating roller, and a peripheral surface of the rotating roller. , A first press roller slidable along a tangent line, a metal plate support rotatably supported at one end thereof and slidable along the tangential direction, and an axis parallel to the axis of the rotary roller. A second pressing roller having a center and close to the peripheral surface thereof, wherein the tip of a metal plate mounted on the metal support and protruding from the peripheral surface of the first pressing roller is 2
The pressing roller is located closer to the rotation roller than the axis of the pressing roller. The axis of the first pressing roller is initially distant from the axis of the rotating roller than the second pressing roller, but the difference between the separation and the proximity during bending is small.

According to this, the metal plate placed on the metal plate support slides together with the metal plate support, and the first pressing roller axially supported by one end of the support supports the peripheral surface of the rotary roller. And after the tip of the metal plate contacts the peripheral surface of the second pressing roller, the metal plate is sent out from the metal support while being sandwiched between the three rollers, and the metal plate is rotated by the rotating roller and the 1/1 / By being sandwiched by the second pressing roller, it is plastically deformed into an arc shape with the rotating roller side inside. In such a state, the metal plate is connected to the rotating roller by the first and second rollers.
And with a predetermined curvature. Therefore, it is possible to accurately and quickly bend a cylindrical product which is bent into a cylindrical shape and has both end edges overlapping or in contact with each other, and can be provided at a low cost. In addition, the obtained cylindrical product is a strong cylindrical shape with good shape and dimensional accuracy by spot welding, seam welding, licking welding, brazing, caulking, or screwing the overlapping or contacting both edges. Can be obtained.

[0008] The first pressing roller and the second pressing roller also include a bending device having a smaller diameter than the rotating roller. According to this, since the first and second pressing rollers approach each other, the metal plate passing between these and the rotating roller surely undergoes bending deformation in a state where the springback is suppressed. As a result, a cylindrical product having a desired diameter can be bent accurately and quickly. The outer diameter of the first and second pressing rollers should be at least 90% or less of the outer diameter of the rotating roller, or about 1/2 to 1/4. desirable. Further, the second pressing roller having the axis at a position close to the rotating roller includes a bending device capable of adjusting the position with respect to the axis of the rotating roller. According to this, the position of the second pressing roller is adjusted with respect to the axis of the rotating roller, or the sliding distance of the metal support is adjusted together with the position of the first pressing roller. Accordingly, the curvature at which the metal plate is bent can be easily changed, and a cylindrical product having a desired diameter can be bent reliably and quickly.

In addition, the rotary roller and the first and second
Further comprising a product pusher disposed at one end of each roller so as to be slidable in parallel with each axis of the pressing roller and discharging a cylindrically bent product along its central axis. Processing equipment is also included. According to this, a product obtained by bending a metal plate into a cylindrical shape is quickly pressed by a product pusher that slides in parallel with the axis of the rotating roller and the first and second pressing rollers while maintaining the molding accuracy. In addition, the paper can be automatically discharged from each of the rollers to the outside. For this reason, it is possible to immediately shift to the state of the next bending process, and it is possible to accurately and efficiently bend a cylindrical product from a flat metal plate.

The rotating roller and the first and second pressing rollers can be individually replaced with rollers having different outer diameters. Further, the sliding distance of the metal plate support can also be changed.
Also, the axis of the pressing roller can be changed in distance from the axis of the rotating roller. These also make it possible to reliably bend a cylindrical product having a desired diameter. Furthermore,
Since the first and second pressing rollers can also be individually rotated in the opposite direction to the rotating roller, friction with the metal plate can be reduced, and more accurate bending can be performed.

Further, by attaching a limit switch or a hitter which rotates against the limit switch to the metal plate support, a drive signal is transmitted to a drive source of the product pusher, or by connecting to a counter, The number of moldings can be automatically recorded and displayed as needed. As a result, the product pusher can be slid in conjunction with the product immediately after the bending, and the obtained product can be quickly and promptly discharged, and the total number of the bending can be always accurately grasped. Note that a photoelectric tube, a solenoid valve, or the like may be used instead of the limit switch.

[0012]

Preferred embodiments of the present invention will be described below with reference to the drawings. 1A and 1B are perspective views showing a bending apparatus 1 according to the present invention. The bending device 1 includes a rotating roller 4 that horizontally projects from a side surface of a vertical plate 2 erected from a base (not shown) on the near side and rotates.
A metal plate support 14 that slides on the right base 12 in the left-right direction in the figure, a first pressing roller 16 rotatably supported at the left end (one end) thereof, and a left base 2
And a second pressing roller 28 rotatably supported at the right end of the support plate 24 positioned on the second support roller 24.

The outer diameters of the first and second pressing rollers 16 and 28 are at least 90% or less of the outer diameter of the rotating roller 4, for example, a small diameter of about half. The rotating roller 4 is
As shown in FIG. 1 (A), the vertical plate 2 is supported in a cantilever state via a bearing (not shown), and is connected to a motor 5 located on the back side of the vertical plate 2 and a rotating shaft (not shown). Connected. A product pusher 6 is supported on the vertical wall 2 adjacent to the rotating roller 4 so as to be slidable in the front-rear direction in the figure, and an air cylinder 7 for driving the pusher 6 is provided.
Is attached to the back side of the vertical plate 2.

As shown in FIGS. 1 (A) and 1 (B), a metal plate support 14 which supports the first pressing roller 16 via a bearing 17 has a flat metal plate to be bent on its upper surface. P is positioned and mounted by the stopper 18. In addition, the support base 14 moves the rod 20 connected to the pin 19 protruding from the side surface on the front side along the axial direction of the support roller 14 through a horizontally rotating lever handle (not shown), thereby causing the rotation roller 4 to rotate. It is slidable left and right along the tangential direction. Further, a hitter 15 is provided upright on the upper surface of the support base 14 so as to be able to contact the ring 9 at the tip of the limit switch 10 arranged on the right side of the vertical plate 2.

The second pressing roller 28 is connected to a bearing 29.
The support plate 24 pivotally supported through the base plate has a bolt 26 standing upright from the base 22 penetrated into the elongated hole 25, and by fastening a nut (not shown) to the bolt 26,
It is positioned on the base 22. Since the tips of a pair of bolts 27 penetrating the vertical wall 23 erected from the left end of the base 22 are in contact with the left side surface of the support plate 24, the nuts fastened to the bolts 26 are loosened, and Bolt 27
Is moved forward or backward, or a spacer (not shown) is inserted between each bolt 27 and the support plate 24 so that the second pressing roller 28 is connected to the axis g of the rotating roller 4.
Can be adjusted.

As shown in FIGS. 2A and 2A, in the state before the processing, the tip s of the metal plate P mounted on the metal plate support 14 has a first pressing roller. The upper end 16 protrudes leftward from this, and the tip s is located closer to the rotary roller 4 with respect to the axis g of the second pressing roller 28. For this reason, when the metal plate P is slid to the left together with the support table 14, the leading end S of the metal plate P is brought into contact with the second pressing roller 28 and the rotating roller as shown in FIGS. 1B and 2B. 4 and between the circumference. At the same time, the metal plate P
By being pinched and pressed between the peripheral surfaces of the rotating roller 4 and the first and second pressing rollers 16 and 28, as shown in FIG. 2 (b), it starts to be bent and deformed M into a circular arc shape with a predetermined curvature. . In this case, as shown in FIG. 2B, the axis g of the first pressing roller 16 is located directly below or slightly to the left of the axis g of the rotating roller 4, that is, the second pressing roller 28. It is located closer.

In this state, as shown in FIG. 2C, the metal plate P is rotated by the rotating roller 4 and the first and second pressing rollers 16 and 2.
8 and pass. As a result, as shown in FIG. 2C, a product W having a cylindrical shape as a whole and having both ends M1 and M2 overlapping each other can be formed. In addition, the metal plate P is subjected to bending deformation M while being strongly pressed by the rotating roller 4 and the first and second pressing rollers 16 and 28 whose peripheral surfaces are close to each other. After passing between 16, 28, springback due to elasticity hardly occurs. Therefore, the cylindrical product W having a preset diameter can be formed with good shape and dimensional accuracy, and can be formed reliably and quickly in one process (one pass). Incidentally, in the bending apparatus 1, the diameter is about 20 mm.
Millimeter rotating roller 4 and first and second about 17 mm diameter
When a steel plate (metal plate P) having a length of about 200 mm, a width of about 20 mm and a thickness of about 0.5 is inserted between the pressing rollers 16 and 28, the diameter is about 60 mm in a short time of about 1 second. Was manufactured.

FIG. 3A shows a state immediately after the product W has been formed in the bending apparatus 1. As shown,
The hitter 15 of the metal plate support 14 is
After the ring 9 at the leading end is once pushed backward, it has moved to the left. The limit switch 10 pressed by the hitter 15 sequentially accumulates the total number of bending processes in a control circuit (not shown) and displays the total number of counters, monitors, and the like. When the metal plate support 14 is slid to the right together with the first pressing roller 16 via the rod 20 as shown by the arrow in FIG. Contact 9 At this time, the limit switch 10 instructs the drive source of the air cylinder 7 to slide the piston rod 8 toward the near side of the vertical plate 2 via a control circuit (not shown). As a result, as shown in FIG. 3B, since the product pusher 6 moves forward along the center axis of the product W, the formed product W is automatically transferred from the rotating roller 4 and the second pressing roller 28. Can be extracted.

FIG. 4 relates to different states of use of the bending apparatus 1. FIG. 4A shows that the position of the support plate 24 is adjusted so that the axis g of the second pressing roller 28 is closer to the rotating roller 4 and the first pressing roller 16 as compared with FIG. This shows bending work in a state where the position is adjusted. For this reason, the metal plate P receives a bending deformation M having a relatively small radius of curvature. On the other hand, as shown in FIG. 4B, the axis g of the second pressing roller 28 is
When the metal plate P is separated from the pressing roller 16, the metal plate P receives a bending deformation M having a relatively large radius of curvature.

Further, as shown in FIG. 4 (C), the metal plates can also be formed by setting the pressing rollers 16, 28 at the same position as in FIG. 4 (A) and replacing the rotating roller 4a with a slightly smaller outer diameter. P undergoes a bending deformation M with a relatively small radius of curvature. On the other hand, as shown in FIG.
Is replaced with one having a large outer diameter, and the holding rollers 16,
By separating the metal plates 28 from each other, a bending deformation M having a larger radius of curvature can be performed on the metal plate P.

Further, as shown in FIG. 4 (E), the second pressing roller 28 is set at the same position as in FIG. 4 (A), and the first pressing roller 16 is further slid to the left together with the support stand 14. When the pressing rollers 16 and 28 are in a state immediately before contacting each other, the bending deformation M having a smaller radius of curvature can be performed on the metal plate P. On the other hand, as shown in FIG. 4 (F), the second pressing roller 28 is set at the same position as in FIG. 2 (B), and the first pressing roller 16 has its axis aligned with the axis of the rotating roller 4. It is also possible to perform the bending deformation M having a relatively large radius of curvature by adjusting the position so as to be slightly to the right of the position immediately below.

The present invention is not limited to the embodiments described above. For example, the rotating roller 4 and the first and second
In the above-described embodiment, the pressing rollers 16 and 28 have their axes g oriented horizontally. However, the respective axes g are arranged in parallel along the vertical direction, or are arranged in parallel along the same inclined oblique direction. It is also possible. In addition, according to the above, the metal plate support 14 that supports the first pressing roller 16 and the support plate 24 that supports the second roller 28 can also have a vertical posture or an oblique posture. In this case, in order to fix the position of the metal plate P placed on the support base 14, a jig for restraining the metal plate P until immediately before processing is provided.

Further, the rotating roller 4 and the first and second pressing rollers 16 and 28 are not limited to the above-mentioned cylindrical flat rollers, but may be tapered rollers having a gentle inclination, or may protrude loosely near the center in the direction of the axis g. It is also possible to use a barrel-shaped roller or a drum-shaped roller whose center is also slightly concave. Accordingly, it is possible to accurately bend a cylindrical product W which is inclined in the width direction along the central axis or whose center in the width direction is loosely projected or recessed. The driving means of the product pusher 6 is not limited to the air cylinder 7 but may be a hydraulic cylinder such as a hydraulic pressure, a magnetic actuator, or a pinion and a rack meshing with the pinion.
The metal plate P applicable to the bending apparatus 1 of the present invention is not limited to a steel plate or a stainless steel plate, but includes an aluminum alloy plate and a titanium alloy plate, and covers the entire surface of the metal plate including the steel plate. Therefore, a so-called punching metal in which a large number of round holes or square holes are formed in a staggered or lattice shape is also included.

[0024]

According to the bending apparatus of the present invention described above, the metal plate slides together with the metal plate support, the first pressing roller approaches the peripheral surface of the rotating roller, and the tip of the metal plate is moved. After coming into contact with the peripheral surface of the second pressing roller, it is sent out from the metal support while being sandwiched between the rotating roller and the first and second pressing rollers, and is plastically deformed into an arc shape with the rotating roller side inside. . In this state, the metal plate passes between the rotating roller and the first and second pressing rollers with a predetermined curvature. Therefore, a cylindrical product which is bent into a cylindrical shape and whose both edges overlap or come into contact with each other can be quickly and accurately bent, and can be provided at low cost.

Further, according to the bending apparatus of claim 2,
Bending with high accuracy can be performed more reliably by suppressing springback of the metal plate. Further, according to the bending apparatus of the third aspect, the position of the second pressing roller is adjusted with respect to the axis of the rotating roller or the sliding distance of the metal support is adjusted together with the first pressing roller. By adjusting the position of the pressing roller, the curvature at which the metal plate is bent can be easily changed, and a cylindrical product having a desired diameter can be bent reliably and quickly. In addition, according to the bending device of the fourth aspect, the molding accuracy is formed by the product pusher that slides the product bent into a cylindrical shape in parallel with the axis of the rotating roller and the first and second pressing rollers. In this state, the rollers can be quickly and automatically discharged from the rollers to the outside. For this reason, it is possible to immediately shift to the state of the next bending process, and it is possible to efficiently perform the bending process.

[Brief description of the drawings]

FIGS. 1A and 1B are perspective views showing a state before or during processing of a bending apparatus of the present invention.

2 (A) to 2 (C) are schematic views showing a processing process of the bending apparatus of FIG. 1, and FIGS. 2 (a) to 2 (c) are before or during processing corresponding to (A) to (C). Schematic diagram showing a metal plate or a bent product.

FIGS. 3A and 3B are perspective views showing a state immediately after processing by a bending apparatus or during discharge of a product.

FIGS. 4A to 4F are schematic diagrams showing different states of processing in a bending apparatus.

5A and 5B are schematic diagrams showing a state before or during processing of a conventional bending apparatus, FIG. 5C is a schematic diagram of the obtained product, and FIGS. FIGS. 3G to 3I are schematic diagrams showing processes of different bending methods, and FIGS. 2G to 2I are schematic diagrams of a so-called homing process and an obtained product.

[Explanation of symbols]

 1 Bending device 4, 4a, 4b Rotary roller 6 Product pusher 14 Metal plate support 16 First pressing roller 28 ……………………………………………………………………………………………… Metal plate s ……………… Tip W ………………………………

Claims (4)

[Claims] An apparatus for bending a flat metal plate (P) into a cylindrical shape, comprising: a rotating roller (4); and an axis (g) parallel to the axis (g) of the rotating roller (4). ) And a first pressing roller (16) slidable along a tangent line on the peripheral surface of the rotating roller (4) and rotatably supported at one end thereof and slidable along the tangential direction. A metal plate support (14), a second pressing roller (28) having an axis (g) parallel to the axis (g) of the rotating roller (4), and being close to the peripheral surface thereof; And a first pressing roller mounted on the metal support (14).
The tip (s) of the metal plate (P) projecting from the peripheral surface of (16) is
A bending apparatus (1), which is located closer to the rotation roller (4) than the axis (g) of the second pressing roller (28). 2. The bending according to claim 1, wherein the first pressing roller and the second pressing roller have a smaller diameter than the rotating roller. Processing equipment (1). 3. An axial center at a position close to said rotary roller (4).
(g), the second pressing roller (28) can be adjusted in position with respect to the axis (g) of the rotating roller (4);
The bending apparatus (1) according to claim 1 or 2, characterized in that: 4. One end of each of said rollers (4, 16, 28) so as to be slidable in parallel with each axis (g) of said rotating roller (4) and said first and second pressing rollers (16, 28). 4. A product pusher (6), which is disposed close to and discharges a product (W) bent into a cylindrical shape along a central axis thereof, further comprising: a product pusher (6). (1).