JP2023513174A - Bending system for forming corrugations and method for using same - Google Patents

Abstract

The present invention relates to a bending installation for forming transverse corrugations in a metal sheet, said bending installation (9) comprising a drive (11) for advancing the metal sheet (1) and a bending device (12). a bending device (12) comprising a frame (13) movable between a rearward position and a forward position parallel to the direction of travel by means of a first actuator; (17) is used to control a punch (16) vertically movable on a frame (13) between a rest position and a bending position, a first actuator (14) and a second actuator (17). a control unit (29) adapted to move the frame (13) of the bending device (12) from the rearward position to the forward position and at the same time move the punch (16) from the rest position to the bending position. and have. [Selection drawing] Fig. 2

Description

The present invention relates to bending equipment for forming corrugations in metal sheets.

Corrugated metal sheets obtained using bending equipment as described above are intended to construct hermetic membranes for tanks, the present invention being a hermetic insulation for the storage and/or transport of fluids such as liquefied gases. It also relates to the field of membrane tanks.

Korean Patent Publication No. 2015-0100009 discloses an installation for forming a corrugation sheet for forming a sealing membrane for liquefied natural gas. The forming equipment has a device with an embossing roller which is capable of continuously forming corrugations in the longitudinal direction, i.e. corrugations parallel to the direction of travel of the sheet. The sheet is then cut and passed through a suitable press to press the sheet. This press is suitable for forming transverse corrugations, i.e. corrugations that extend perpendicularly to the longitudinal corrugations for each stroke of the press. With such a system it is possible to produce very long corrugation sheets.

However, the systems described above are not entirely satisfactory. In particular, lateral corrugations are not continuously formed, which reduces the effectiveness of the corrugated sheet forming method. Furthermore, the lateral corrugations are formed by the pressing method and not by the bending method. Unlike the bending operation, the pressing operation has the effect of changing the thickness of the metal sheet at the corrugation location, thereby deteriorating the mechanical properties of the corrugation sheet.

One idea behind the present invention is to propose a simple and effective bending installation for forming transverse corrugations in metal sheets. Another idea behind the present invention is to propose a bending installation with which corrugations can be produced more productively. Another idea behind the present invention is to propose a bending installation that makes it possible to obtain corrugations without significantly changing the thickness of the sheet.

In one embodiment, the present invention provides bending equipment for forming lateral corrugations in a metal sheet, the bending equipment comprising:
- a drive to advance said metal sheet horizontally from rear to front in the direction of travel;
- a bending device;
and
The bending device is
- a frame movably mounted parallel to said direction of travel between a rearward position and a forward position, adapted to move said frame between said rearward position and said forward position; a frame with one actuator provided for said frame;
- a transversely long-sided punch perpendicular to said direction of travel, vertically on said frame at a stop position and deforming said metal sheet to form one said corrugation in transverse direction; a punch provided thereon with a second actuator movable between a bending position and configured to move the punch between the rest position and the bending position;
- adapted to control said first actuator and said second actuator to move said frame of said bending device from said rearward position towards said forward position, while at the same time moving said punch from said rest position to said a control unit configured to move toward a bending position;
It has

Such a configuration allows the bending equipment described above to continuously bend metal sheets to form corrugations without significantly changing the thickness of the metal sheets.

Embodiments of the bending equipment described above include one or more of the following features.

In one embodiment, the metal sheet is for forming a membrane for a liquefied gas storage tank.

In one embodiment, the control unit is arranged to control the drive to advance the metal sheet from rear to front at a speed V1, the control unit comprising:
dr/dt=V1
where r represents the reduction in the dimension f of the metal sheet in the direction of travel due to the bending operation, and t represents the time.

の速度Ｖ７で前記パンチを前記曲げ位置の方向に移動させるように構成されており、好適には前記速度Ｖ７は

に等しく、
ここで、αは前記パンチの断面の一辺と水平軸との間に形成される角度を表す。 In one embodiment, the control unit is arranged to control the drive to move the metal sheet from rear to front with a speed V1, and the control unit is arranged to move the second actuator but,

is configured to move the punch toward the bending position at a speed V7 of

equal to
Here, α represents the angle formed between one side of the cross section of the punch and the horizontal axis.

In one embodiment, said control unit is arranged to: - said first actuator moves said frame of said bending device from said rearward position towards said forward position with a speed V2,
The speed V2 is equal to the speed V1 when the punch moves from the stop position toward the intermediate position where it contacts the metal sheet, and when the punch moves from the intermediate position toward the bending position. is lower than the speed V1.

In one embodiment, the control unit is configured such that when the punch moves from the intermediate position toward the bending position, the first actuator moves the frame of the bending device from the rearward position toward the forward position. , 0.95×(1/2)V1 to 1.05×(1/2)V1. Velocity V2 is preferably equal to (1/2)V1, and the above-mentioned velocity range makes it possible to take into account incidental phenomena such as, for example, in particular sliding phenomena.

In one embodiment, when said second actuator moves said punch from said bending position towards said rest position, said control unit causes said first actuator to continue movement of said frame towards said forward position. is configured to

In one embodiment, the bending device is - a lower sub-frame mounted vertically movably on the frame of the bending device, arranged on the punch side and having a stop position and a bending position. a lower sub-frame provided for said lower sub-frame with a third actuator suitable for moving said lower sub-frame between
- two side dies each provided with an upper support surface for receiving said metal sheet and a demi empreinte;
and
The two side dies are horizontally spaced on the lower sub-frame and have an imprinting portion having a spaced-apart position and a combined shape of the imprinting portion halves complementary to the empreinte of the punch. is mounted to slide in a direction parallel to said direction of travel between a proximate position forming a

In some embodiments, each side die has one or more grooves parallel to the direction of travel, each groove receiving a preformed longitudinal corrugation. be.

In one embodiment, the control unit is configured such that the third actuator moves the lower sub-frame from the rest position to the bending position when the punch moves from the rest position toward an intermediate position in contact with the metal sheet. configured to move to

In one embodiment, the bending apparatus comprises a return member configured to return the side dies toward the spaced-apart position.

In one embodiment, the punch is fixed to a plunger movable by the first actuator to move the punch between the rest position and the bending position, and the bending device comprises: Two die cushions are provided on each side of the punch, each die cushion having a clamping surface facing one of the side dies, each die cushion having a corresponding die cushion support. The die cushion support is horizontally mounted on the plunger and parallel to the direction of travel between a spaced position and a close position. Such a configuration can ensure that the produced corrugated metal sheet is flat.

In one embodiment, the bending installation further comprises a corrugating device upstream of the bending device configured to form at least one corrugation extending parallel to the direction of travel. Such a configuration allows the bending equipment to produce sheets with mutually perpendicular corrugations.

In one embodiment, the bending installation further comprises, downstream of the bending device, a forming device configured to correct corrugations previously bent by the bending device.

In one embodiment, said shaping device is - a frame movably mounted parallel to said direction of travel between a rearward position and a forward position, said frame moving between said rearward position and said forward position; a frame provided with respect to said frame with a fourth actuator capable of moving the
- vertically on the frame of the forming device, between a rest position and a forming position in which the metal sheet is deformed to correct the shape of the transverse corrugations previously formed by the bending device; a punch movably mounted in a , wherein the punch is provided with a fifth actuator configured to move the punch between the rest position and the forming position;
It has

In one embodiment, the control unit is arranged to control the fourth actuator and the fifth actuator.

In one embodiment, said control unit controls said drive to advance said metal sheet from rear to front at a speed V1, said control unit controlling said fourth actuator to move from said rear position to said front position. toward an intermediate position where the punches of the bending device contact the metal sheet from the rest position at a speed V3. It is equal to the velocity V1 when moving and is zero when the punch of the bending device moves from the intermediate position towards the bending position.

In one embodiment, the invention provides a method for using the bending equipment described above, the method comprising:
- positioning the metal sheet so that the drive advances the metal sheet;
- said first actuator to move, by means of a control unit, said frame of said bending device from said rearward position towards said forward position and simultaneously move said punch from said rest position towards said bending position; controlling the second actuator;
including.

Embodiments of the methods described above for using bending equipment include one or more of the following configurations.

In one embodiment,
dr/dt=V1
controlling the second actuator to move the punch in the direction of the bending position at a speed of
where r represents the reduction in the dimension f in the direction of travel of the metal sheet during the bending operation,
t represents time.

の速度Ｖ７で前記パンチを前記曲げ位置の方向に移動させるように前記第２のアクチュエータを制御し、好適には前記速度Ｖ７は

に等しく、
ここで、αは前記パンチの断面の一辺と水平軸との間に形成される角度を表す。 In one embodiment,

and controlling the second actuator to move the punch toward the bending position at a velocity V7 of

equal to
Here, α represents the angle formed between one side of the cross section of the punch and the horizontal axis.

In one embodiment, the control unit is configured to move the first actuator from the rearward position to the forward position when the punch of the bending device moves from an intermediate position in contact with the metal sheet toward the bending position. controlling the first actuator so as to move the frame of the bending apparatus at a speed V2 of 0.95×(1/2)V1 to 1.05×(1/2)V1; Velocity V2 is preferably equal to (1/2)V1.

In one embodiment, the first and second actuators are controlled to continue movement of the frame toward the forward position when moving the punch from the bent position toward the rest position. .

In one embodiment, the bending equipment further comprises, downstream of the bending equipment, a forming device configured to correct corrugations previously bent by the bending equipment,
The molding device is
a frame movably mounted parallel to the direction of travel between a rearward position and a forward position, the frame being configured to move the frame between the rearward position and the forward position; a frame provided with respect to said frame with an actuator of
vertically on the frame of the forming device between a rest position and a forming position in which the metal sheet is deformed to correct the shape of the transverse corrugations previously formed by the bending device; a movably mounted punch, the punch being provided with a fifth actuator configured to move the punch between the rest position and the forming position;
and
controlling the fourth actuator to move the frame of the forming apparatus from the forward position toward the rearward position at a velocity V3;
The speed V3 is equal to the speed V1 when the punch of the bending device moves from the rest position toward the intermediate position where it contacts the metal sheet, and the punch of the bending device moves toward the metal sheet. is zero when moving from an intermediate position in contact with the to the bending position.

The invention will be better understood and other objects, details, features and advantages of the invention will be better understood from reading the following description of several specific embodiments thereof, taken in conjunction with the accompanying drawings. becomes clear. The specific embodiments described below are exemplary only and do not limit the invention.

Fig. 2 shows a corrugated metal sheet for constructing a sealing membrane of a liquefied natural gas storage tank; 1 is a schematic diagram of an embodiment of bending equipment in an initial state; FIG. Figure 3 is a schematic view of the bending installation of Figure 2 in a second state; Figure 3 is a schematic view of the bending installation of Figure 2 in a third state; Figure 3 is a schematic view of the bending installation of Figure 2 in a fourth state; Fig. 3 is a schematic view of the bending installation of Fig. 2 in a fifth state; Fig. 3 is a schematic view of the bending installation of Fig. 2 in a sixth state;

FIG. 1 shows a corrugated metal sheet 1 for forming the sealing membrane of a storage tank for fluids such as liquefied natural gas.

The metal sheet 1 has a row of parallel first corrugations 2 extending in the direction y and a row of parallel second corrugations 3 extending in the direction x. Direction x and direction y of the corrugation row are perpendicular. These corrugations 2, 3 protrude from the inner surface of the metal sheet 1 which is placed in contact with the fluid contained in the tank. Here, the edges of the metal sheet 1 are parallel to the corrugations 2,3.

The metal sheet 1 comprises a plurality of flat surfaces 4 between corrugations 2,3. The metal sheet 1 has a node area 5 at each place where two corrugations 2, 3 intersect. The node region 5 has a central portion 6 with a top projecting towards the interior of the tank. Furthermore, the central portion 6 is adjacent to a pair of concave corrugations 7 formed on the ridges of the corrugations 3 and a pair of depressions 8 through which the corrugations 2 pass.

Corrugations 2, 3 in the metal sheet 1 allow the sealing membrane to be flexible in order to be able to deform due to thermal and mechanical loads caused by the fluid stored in the tank.

The metal sheet 1 is in particular stainless steel, aluminium, Invar, an alloy of iron and nickel with a coefficient of expansion typically between 1.2×10 ⁻⁶ and 2×10 ⁻⁶ K ⁻¹ , Or it can be made from an iron alloy with a high content of manganese, whose coefficient of expansion is typically on the order of 7×10 ⁻⁶ K ⁻¹ . However, the use of other metals or alloys is also possible.

For example, the metal sheet 1 has a thickness of approximately 1.2 mm. Other thicknesses can be chosen, bearing in mind that increasing the thickness of the metal sheet 1 leads to an increase in its cost and generally increases the stiffness of the corrugations 2,3.

A bending installation 9 for forming parallel corrugations in a metal sheet 1 will now be described with reference to FIGS.

The installation comprises a reel 10 on which a strip of metal sheet 1 is wound.

The bending installation 9 also comprises a drive 11 for advancing the metal sheet 1 in the direction of travel indicated by the arrow f in FIGS. As shown in FIGS. 2-4, the drive 11 comprises one or more pairs of rollers. Each pair of rollers includes a lower roller and an upper roller arranged one above the other on each side of the metal sheet 1 . The roller and reel 10 rotate about horizontal and parallel axes of rotation. One or more of the rollers advance the metal sheet 1 by being rotationally driven by a motor. Therefore, the driving device 11 is configured to advance the metal sheet 1 at a constant speed V1.

In another embodiment, the guide device comprises the reel 10 and a motor configured to rotationally drive the reel 10 to unwind the metal sheet.

In an embodiment not shown, the bending installation 9 is a roughening device configured to form one or more longitudinal corrugations in the metal sheet 1, i.e. corrugations extending parallel to the direction of travel f. Also prepare. To do this, the ruggedness forming device includes a ruggedness forming roller, such as the ruggedness forming roller described in Korean Patent Publication No. 2015-0100009, for example.

In another embodiment, the metal sheet 1 supplied to the bending installation 9 has preformed corrugations extending parallel to the direction of travel f.

The bending installation 9 also comprises a bending device 12 for forming rows of corrugations transverse to the direction of travel f. The bending device 12 comprises a frame 13 movably mounted parallel to the direction of travel between a rearward position shown in FIG. 2 and a forward position shown in FIG. To do this, the frame 13 is for example guided on rails extending parallel to the direction of travel f. Furthermore, the bending installation 9 comprises at least one actuator 14, for example a cylinder or a motor, with which the frame 13 can be moved between a rearward position and a forward position.

The bending device 12 also comprises a plunger 15 provided with a punch 16 for deforming the metal sheet 1 to form lateral corrugations. The punch 16 has a long side elongated in the horizontal direction perpendicular to the traveling direction f. Each punch 16 is provided at its lower end with a head having a substantially triangular or V-shaped cross-section. Plunger 15 is mounted vertically on frame 13 of bending device 12 for movement between an uppermost rest position shown in FIG. 2 and a lowermost bending position shown in FIG. ing. This bending position is where the punch 16 deforms the metal sheet 1 to form a lateral corrugation. The bending device 12 comprises at least one actuator 17, for example a cylinder, by means of which the plunger 15 can be moved between an uppermost rest position and a lowermost bending position.

Furthermore, the bending device 12 is vertically positioned on the frame 13 of the bending device 12 between the lowermost stop position shown in FIG. 2 and the uppermost bending position shown in FIG. It has a movably mounted lower subframe 18 . The bending device 12 comprises, for example, at least one actuator 19, for example a cylinder, with which the lower subframe 18 can be moved between a lowermost rest position and an uppermost bending position.

In addition, the bending device 12 has two side dies 20 and 21 which are mounted so as to slide horizontally on the lower sub-frame 18 in a direction parallel to the advancing direction f, for example, by means of guide rails or the like. are provided for each. The side dies 20 , 21 have upper support surfaces for the metal sheet 1 . Each of the two side dies 20,21 further has a concave embossing half formed on the end face facing the other side die 20,21. When the two side dies 20, 21 are in close proximity, the embossing halves together form a embossing corresponding to the shape of the corrugation to be formed. In one embodiment, when longitudinal corrugations are formed upstream from the bending device 12, each side die 20, 21 has one or more grooves, each groove corresponding to one of the longitudinal corrugations. Each groove receives a longitudinal corrugation previously formed in the metal sheet 1 . The side dies 20, 21 are movably mounted on the lower subframe 18 between a spaced position shown in FIG. 2 and a close position shown in FIG.

In one embodiment, as will be described later, the metal sheet 1 is pressed against the side dies 20 and 21 by, for example, a die cushion or the like, and when the metal sheet 1 is bent, a traction force is transmitted to the side dies 20 and 21, and this traction force is Side dies 20, 21 are moved from the spaced position to the close position. Furthermore, the bending device 12 comprises a return member (not shown), for example a mechanical spring or a gas spring, configured to return the side dies 20, 21 from the close position towards the spaced position.

In another embodiment, the bending apparatus 12 is capable of moving side dies 20, 21 between their spaced-apart and close-together positions, or a dedicated device to assist in this movement. It is equipped with an actuator, this dedicated actuator not shown in Figures 2-5.

Moreover, in one embodiment not shown, the bending apparatus 12 further comprises a die cushion extending on each side of the punch 16, each die cushion being one of the side dies 20, 21, respectively. It has a clamping surface facing one side. The die cushion is mounted movably in the vertical direction on the die cushion support. In addition, the bending apparatus 12 also includes a resilient member which tends to move the die cushions relative to their respective die cushion supports into a lowermost abutment position. The die cushion support is mounted to slide horizontally on the plunger 15 in a direction parallel to the direction of travel f between the spaced position and the close position. Since the die cushion is movable in the vertical direction relative to the plunger 15, the die cushion presses the metal sheet 1 against the side dies 20, 21 at intermediate vertical positions of the plunger 15, thereby bending the metal sheet 1 in the intermediate position and bending. The plunger 15 can be prevented from falling between the positions.

In one embodiment, the metal sheet 1 is bent by moving the plunger 15 to the lowest bending position while the metal sheet 1 is sandwiched between the die cushion and the side dies 20 and 21 . transmits a pulling force parallel to the traveling direction to the die cushion to move the cushion support, thereby moving the die cushion and the side dies 20, 21 from the distant position to the close position. move towards In such embodiments, the bending apparatus 12 comprises a return member, such as a mechanical or gas spring, configured to return the die cushion from the approximated position toward the separated position. In another embodiment, the bending apparatus 12 can also include a dedicated actuator to move or assist in moving the die cushion between the spaced and approximated positions of the die cushion. Dedicated actuators are not shown in Figures 2-5.

In one embodiment, not shown, if the metal sheet 1 to be formed with a transverse corrugation has a longitudinal corrugation, the bending device 12 provides each longitudinal corrugation on each side of the transverse corrugation to be provided. A cutter configured to provide a concave corrugation in the corrugation. Such cutters and mechanisms for actuating them are exemplified in WO2017/077214.

In addition, the bending installation 9 optionally also comprises a forming device 22 for finalizing the transverse corrugations previously formed by the bending device. The forming device 22 comprises a frame 23 movably mounted, for example by guide rails or the like, parallel to the direction of travel, between a rearward position shown in FIG. 2 and a forward position shown in FIG. there is The installation comprises at least one actuator 24, for example a cylinder or a motor, capable of moving the frame 23 between a rearward position and a forward position.

Forming device 22 also includes a punch 25 having a shape corresponding to the final shape of the lateral corrugation. Thus, the punch 25 of the forming device 22 has a semi-elliptical shape, whereas the punch 16 of the bending device 12 has a substantially triangular shape. The punch 25 is mounted movably vertically between an uppermost stop position shown in FIG. 2 and a lowermost forming position shown in FIG. is the position at which the metal sheet 1 is deformed into the final shape of the lateral corrugations previously formed by the bending device 12 . Forming device 22 comprises at least one actuator 26, for example a cylinder, capable of moving punch 25 between an uppermost rest position and a lowermost forming position.

The molding device 22 also includes a die 27 , which is arranged opposite the punch 25 and has a stamping portion having a shape complementary to the shape of the punch 25 . Die 27 is movably mounted on frame 23 of forming apparatus 22 between a lowermost position shown in FIG. 2 and an uppermost forming position shown in FIG. Forming device 22 comprises, for example, at least one actuator 28, for example a cylinder, capable of moving punch 25 between a lowermost position and an uppermost forming position.

The bending installation 9 comprises a control unit 29 capable of controlling the various actuators 14 , 17 , 19 , 24 , 26 , 28 and of synchronizing the movements of the parts of the bending installation 9 . To do this, a position sensor is provided for the drive 11 and for each of the actuators 14, 17, 19, 24, 26, 28 mentioned above, the position sensor providing a signal representing the advancing speed V1 of the metal sheet 1 and , the position of frame 13 of bending device 12, plunger 15, sub-frame 18, and optionally die cushion and side dies 20, 21, frame 23 of forming device 22, punching and forming device of forming device 22 and a signal representing the position of the die 27 of 22 to the control unit 29 .

Control unit 29 includes memory and a microprocessor and is capable of storing and processing data in a manner detailed below. The control unit 29 is specifically arranged so that the various parts of the bending installation 9 follow the kinematic characteristics described below.

In the initial state shown in Figure 2:
- the frame 13 of the bending device 12 and the frame of the forming device 22 are in a rearward position,
- the plunger 15 of the bending device 12 is in the uppermost stop position,
- the lower subframe 18 of the bending device 12 is in its lowest rest position,
- optional die cushions and side dies 20, 21 in a spaced apart position;
- the punches of the forming device 22 are in the uppermost stop position,
- the die of the forming device 22 is in its lowest rest position;

In a first step between the initial state shown in FIG. 2 and the first intermediate state shown in FIG. At speed V3, they are moved toward their forward positions. The above speeds V2 and V3 are equal to the advancing speed V1 of the metal sheet 1 . Downstream of the bending facility 9, the metal sheet 1 is likewise moved at a velocity V4 equal to V1 in the initial state.

Further, the punches 25 and dies 27 of the forming device 22 move toward their respective lowermost and uppermost forming positions, while the plungers 15 and lower subframes 18 of the bending device 12 each move toward their respective lowermost and uppermost forming positions. and move towards the uppermost bending position. The lower subframe 18 of the bending device 12 reaches its uppermost bending position before or at the same time as or before the punch 16 reaches the intermediate position where the corrugation begins to bend by contacting the metal sheet 1 shown in FIG. The die 27 of the forming device 22 also reaches its uppermost forming position before or at the same time as the punch 16 reaches its intermediate position in contact with the metal sheet 1, and the actuator 24 was also preformed by the bending device 9. The corrugations are controlled to place the dies 27 at the molding locations 22 opposite each other.

From the second state shown in FIG. 3, when the punch 16 reaches the intermediate position and the corrugation begins to bend, the bending is continued until the punch 16 reaches the lowest bending position shown in FIG. The actuator 17 that moves the punch 16 of the processing device 12 moves at such a speed that the reduction in the dimensions of the metal sheet 1 caused by the bending operation restrains the advance of the metal sheet 1 . As a result, the velocity of the metal sheet 1 downstream of the bending device 12 becomes zero.

In other words, the speed at which the dimension f in the traveling direction of the metal sheet 1 decreases is substantially equal to the traveling speed V1 of the metal sheet 1 . Thus, the speed at which the actuator moves plunger 15 is determined as a function of the cross-sectional geometrical properties of punch 16 so as to satisfy the following equation:
dr/dt=V1
where r represents the reduction in dimension of the metal sheet 1 in the direction of travel f during the bending operation and t represents time.

であり、好適には

に等しくなるように決定することができる。ここで、αはパンチの実質的に三角形の断面の一辺と水平軸との間に形成される角度を表す。 Specifically, the vertical movement velocity V7 of the actuator 17 is
The speed V7 is

and preferably

can be determined to be equal to where α represents the angle formed between one side of the substantially triangular cross-section of the punch and the horizontal axis.

Furthermore, from the first intermediate state shown in FIG. 3, the control unit 29 reduces the movement speed V2 of the frame 13 of the bending device 12 until the punch 16 reaches its lowest bending position. The new velocity V2 of the frame 13 of the bending device 12 is between 0.95*(1/2)V1 and 1.05*(1/2)V2 and substantially corresponds to the following formula:
V2=(1/2)V1

Under the assumption that the bending apparatus 12 does not have dedicated actuators for moving the side dies 20,21, the metal sheet 1 transfers traction to the side dies 20,21 during bending, and this traction forces the side dies 20,21. The part dies 20, 21 are moved from the separated position to the close position. The speed of relative movement of the side dies 20, 21 with respect to the frame 13 of the bending device 12 is equal to V2. Thus, the absolute velocity V5 of the rear side die 20 is substantially equal to V1, while the absolute velocity V6 of the front side die 21 is zero.

In another embodiment in which bending apparatus 12 includes dedicated actuators for moving side dies 20, 21, the actuators for side die 20 move side die 20 to a velocity substantially equal to V2. while the actuator of the side die 21 moves the side die 21 relative to the frame 13 at a velocity substantially equal to V2. controlled as

In a fourth state, shown in FIG. 5, the punches of forming device 22 have reached their lowest forming position.

As soon as the punches 16 of the bending device 12 have reached their lowest bending position as shown in FIG. toward their forward positions with velocities V2 and V3 equal to .

Before the frame 13 of the bending device 12 and the frame of the forming device 22 reach their respective forward positions, as shown in FIG. Rise towards the top stop position. Finally, during the last period, the frame 13 of the bending device 12 and the frame of the forming device 22 move backwards to return to the rearward position shown in FIG. A new, identical cycle can then be performed to form another adjacent lateral corrugation.

The installation further comprises a cutter device, not shown, with which the metal sheet can be cut downstream of the forming device 22 .

Although the invention has been described with reference to a number of specific embodiments, the invention is not limited to these embodiments, and technical equivalents of the means described and combinations thereof belong to the invention. If so, it will be clear that the invention includes these.

Where the verb "comprise" or "comprise" and its conjugations is used, this does not exclude the presence of elements or steps other than those stated in a claim.

In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

Claims (16)

A bending installation (9) for forming transverse corrugations in a metal sheet (1), comprising:
a driving device (11) for advancing the metal sheet (1) horizontally from rear to front in the advancing direction;
a bending device (12);
and
The bending device (12) includes:
a frame (13) movably mounted parallel to said direction of travel between a rearward position and a forward position for moving said frame (13) between said rearward position and said forward position; a frame (13) provided to said frame (13) with a first actuator (14) configured in
A punch (16) having a long side in a lateral direction orthogonal to the advancing direction, and having a stop position and a lateral direction by deforming the metal sheet (1) in the vertical direction on the frame (13). and a bending position forming one of said corrugations of and configured to move said punch (16) between said rest position and said bending position is provided for the punch (16); and
configured to control said first actuator (14) and said second actuator (17) to move said frame (13) of said bending device (12) from said rearward position towards said forward position; a control unit (29) configured to cause the punch (16) to move simultaneously from the rest position towards the bending position;
A bending installation (9), characterized in that it comprises: The control unit (29) is configured to control the driving device (11) to move the metal sheet (1) from rear to front at a speed V1,
The control unit (29) is configured such that the second actuator (17)

is configured to move the punch (16) in the direction of the bending position at a speed V7 of
where α represents the angle formed between one side of the cross section of said punch (16) and the horizontal axis;
Bending equipment (9) according to claim 1. Said control unit (29)
said first actuator (14) is adapted to move said frame (13) of said bending device (12) from said rearward position towards said forward position at a velocity V2;
The speed V2 is equal to the speed V1 when the punch (16) moves from the stop position toward the intermediate position where it contacts the metal sheet (1), and the punch (16) moves from the intermediate position. lower than said velocity V1 when moving towards said bending position;
Bending equipment (9) according to claim 1 or 2. The control unit (29) causes the first actuator (14) to move the bending process from the rearward position toward the forward position when the punch (16) moves from the intermediate position toward the bending position. moving the frame (13) of the device (12) at a speed V2 between 0.95*(1/2)V1 and 1.05*(1/2)V1;
Bending equipment (9) according to claim 3. When said second actuator (17) moves said punch (16) from said bending position towards said rest position, said control unit (29) controls said first actuator (14) to move to said forward position. configured to continue movement of said frame (13) towards
Bending installation (9) according to any one of claims 1 to 4. The bending device (12) includes:
A lower sub-frame (18) mounted movably vertically on said frame (13) of said bending device (12), said lower sub-frame (18) being arranged on said punch (16) side and having a stop position and a bending position. a lower subframe (18) provided to said lower subframe (18) with a third actuator (19) suitable for moving said lower subframe (18) between
two side dies (20, 21) each having an upper support surface for receiving said metal sheet (1) and a stamping half;
and
Said two side dies (20, 21) are arranged horizontally on said lower sub-frame (18) in spaced apart positions and said embossing halves together complementary to the embossing of said punch (16). mounted so as to slide in a direction parallel to the direction of travel between adjacent positions forming one stamping portion having a shape of
Bending installation (9) according to any one of claims 1 to 5. Said control unit (29) controls said third actuator (19) to move said lower sub-frame (18) when said punch (16) moves from said stop position toward an intermediate position in contact with said metal sheet. configured to move from the rest position to the bending position;
Bending equipment (9) according to claim 6. further comprising, downstream of said bending device (12), a forming device (22) configured to correct corrugations previously bent by said bending device (12);
Bending installation (9) according to any one of claims 1 to 7. The molding device (22) comprises:
a frame (23) movably mounted parallel to said direction of travel between a rearward position and a forward position, moving said frame (23) between said rearward position and said forward position; a frame (23) provided to said frame (23) with a fourth actuator (24) capable of
Vertically on the frame (23) of the forming device (22), the metal sheet (22) is positioned to rest and correct the shape of the transverse corrugations previously formed by the bending device (12). A punch (25) movably mounted between a forming position for deforming 1) and a second punch (25) configured to move said punch (25) between said rest position and said forming position. a punch (25) provided with five actuators (26) for said punch (25);
is equipped with
Bending equipment (9) according to claim 8. said control unit (29) is arranged to control said fourth actuator (24) and said fifth actuator (26),
Bending equipment (9) according to claim 9. The control unit (29) controls the driving device (11) to advance the metal sheet (1) from the rear to the front at a speed V1,
Said control unit (29) is arranged such that said fourth actuator (24) moves said frame (23) of said forming device (22) from said rearward position towards said forward position at a speed V3. cage,
Said speed V3 is equal to said speed V1 when said punch (16) of said bending device (12) moves from said rest position towards an intermediate position in contact with said metal sheet (1), said bending is zero when the punch (16) of the processing device moves from the intermediate position towards the bending position;
Bending equipment (9) according to claim 10. A method for using a bending installation (9) according to any one of claims 1 to 11, comprising:
positioning the metal sheet (1) such that the driving device (11) moves the metal sheet (1);
A control unit (29) causes the frame (13) of the bending device (12) to move from the rearward position towards the forward position, while simultaneously directing the punch (16) from the rest position towards the bending position. controlling said first actuator (14) and said second actuator (17) to move by
A method comprising: said second actuator (17)

controlling the second actuator to move the punch (16) toward the bending position at a velocity V7 of
where α represents the angle formed between one side of the cross section of said punch (16) and the horizontal axis;
13. The method of claim 12. When said punch (16) of said bending device (12) moves from an intermediate position where said punch (16) contacts said metal sheet (1) toward said bending position, said punch (16) moves from said rearward position to said forward position. the first actuator so as to move the frame (13) of the bending device (12) toward the controlling (14);
14. A method according to claim 12 or 13. The first actuator (14) and the second actuator (14) are adapted to continue movement of the frame (13) toward the forward position when moving the punch (16) from the bent position toward the rest position. controlling the actuator (17);
A method according to any one of claims 12-14. The bending installation (9) further comprises, downstream of the bending device (12), a forming device (22) configured to correct corrugations previously bent by the bending device (12). and
The molding device (22) comprises:
a frame (23) movably mounted parallel to said direction of travel between a rearward position and a forward position to move said frame (23) between said rearward position and said forward position; a frame (23) provided to said frame (23) with a fourth actuator (24) configured in
Vertically on the frame (23) of the forming device (22), the metal sheet (22) is positioned to rest and correct the shape of the transverse corrugations previously formed by the bending device (12). A punch (25) movably mounted between a forming position for deforming 1) and a fifth actuator configured to move said punch between said rest position and said bending position. a punch (25) provided with (26) relative to said punch (25);
and
controlling the fourth actuator (24) to move the frame (23) of the forming device (22) from the rearward position toward the forward position at a velocity V3;
Said speed V3 is equal to said speed V1 when said punch (16) of said bending device (12) moves from said rest position towards an intermediate position in contact with said metal sheet (1), said bending is zero when said punch (16) of processing device (12) moves from an intermediate position in contact with said metal sheet (1) towards said bending position;
A method according to any one of claims 12-15.

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