KR19990002703A - Bending device and bending method of aluminum side plate - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

Aluminum side plate bending device and method

2. Technical problem to be solved by the invention

Bending, measuring and adjusting bending of the central side plate, i.e. both the warping as well as the anti-tank and elastic recovery, the working process is effectively carried out effectively in a single working unit and preferably all working processes are carried out in a single process Provided is a bending device and method that can be performed.

3. Summary of Solution to Invention

In bending presses that bend aluminum side plates, in particular in the manufacture of the central side plates of liquefied gas tanks, the resilience of the material is taken into account in determining the bending adjustment and the bending adjustment of the material by means of anti-tank and distortion of the material. If possible, the press is connected to the adjusting and measuring device.

4. Important uses of the invention

Used to manufacture central side panels for LNG tanks.

Description

Bending device and bending method of aluminum side plate

The present invention relates to a bending apparatus according to the preamble of claim 1 and a bending method for bending an aluminum side plate in a press. In particular, the invention is intended to produce a so-called central profile for, but not exclusively, LNG-tanks.

Spherical tanks used for the storage or transportation of liquefied gas are quite large in size and usually about 40 m in diameter.

A special side plate is used in the central part of the large spherical tank, which side plate has to be manufactured to the desired curvature by press bending.

The material to be bent for use in the central side plate is usually 15m long, 1m high, and 20mm thick and weighs more than 5000kg.

The finished material requires a high degree of accuracy to meet the requirements corresponding to the numerical accuracy.

This is due to the considerable difficulty in producing the finished product, such as the size of the work material, the bending work, the dimensional inspection and the final adjustment of the bending.

In particular, springback of the material is an important consideration in the process of bending to the dimensions.

In addition, the accurate transport of the material by the press is also difficult due to its huge load.

Moreover, the central side plate is asymmetric in cross section with respect to the central horizontal plane, in particular the parts below the central plane are thicker than the corresponding parts on the central plane. Therefore, the side plates tend to be distorted during the bending process, and it is necessary to take a special process for preventing the distortion during the bending process or to perform a correction process to remove the distortion after the bending process.

Known bending apparatuses are disclosed, for example, in US Pat. No. 3,333,445 and Japanese Patent Publication No. 61199517 and 61199518. These configurations relate to the bending of generally symmetrical work materials, taking into account the anti-ballistic or elastic restoration in advance in the bending step.

Known measurement techniques for controlled movement of work materials are disclosed in Japanese Patent No. 5121330.

It is an object of the present invention that the working process, taking into account both the bending, measuring and adjusting bending of the central side plate, i.e. both warping as well as anti-ballistic and elastic restoring, is effectively carried out in a single work machine and thus preferably all work It is to provide a bending apparatus and method in which the process can be performed in a single process.

Another object of the present invention is to transfer materials into a bending press easily and accurately.

As a result of using the bending apparatus and method according to the present invention in practice, it is shown that the yield is more than twice.

In addition, as the dimensions of the material are accurate, it is much easier to assemble the old tank. In addition, a separate measuring device is not required, and space can be saved considerably.

The object of the invention is achieved as shown in FIG.

Since the elastic restoration of the side plates depends on the calculation into the adjustment program of the device, the desired bending results are usually obtained only within two bending processes.

If the work program includes morphological measurement of the side plates by the measuring transducer after each press movement, the deviation from the desired shape is immediately corrected after each bending press movement. Adjustments can be made immediately. The bending of the side plate can use two bending tools, that is, a female type outside the bent portion and a male type inside the bend. In this case, the distortion of the asymmetrical side can be adjusted during the bending process by using at least two power cylinders, one of which is effectively located near one edge of the side plate and the other opposite this side plate. Located near the edges, force both molds together. Automatic computer controlled numerical operations can be arranged to control the press and desired modifications.

The advantage of using a so-called FEM-program in a computer is that the program, such as the Finite Element Mothod program, is determined in the work by numerical and morphological work and by additional calibration work. The job can be executed accurately and quickly.

The program can also take into account the material properties of the working material as well as the asymmetrical cross-sectional view of the side plates so that accurate bending can be easily made.

Thus, the bending work is reliable and practically automatic.

Since the work material is large and heavy, the material must be accurately transferred into the work device.

The working material may be conveyed by a drive feed roll installed close to the press jaws.

The whole bending and measuring process then requires only one operator.

It is important that the bending radius be highly accurate.

In order for the bending radius to be accurate, it is preferable to move the work material by a short distance of about 5 to 30 cm, preferably 10 cm from one bending position to the next bending position.

The moving distance of the workpiece is measured by a measuring wheel located close to the bending position.

This wheel is connected to the computerized adjustment of the feed roll.

In this way, almost the entire process is automatic while moving accurately and quickly.

The workpiece may be supported by air cushions to minimize friction.

If the press includes a mechanism for correcting excessive bending, the correction can also be performed quickly within the same work device while bending.

Mechanisms for unfolding excessive bending are similar to mechanisms for bending work materials, except that their positions are reversed with respect to the bending surface of the work material and it is necessary to consider asymmetrical side plates in the shape of the work.

1 is an explanatory view from above of a bending device according to the present invention,

2 is a partial cutaway side view of FIG. 1.

* Description of the symbols for the main parts of the drawings *

1: measuring and bending device 2: bending press

3: measuring device 4: (center) side plate

4 ': top edge 4: bottom edge

5 instrument carrier 5a female bending machine

5b: male bending machine 6: fixture

7: Measurement transducer 8a, 8b: (movement direction) arrow

9a, 9b: arrows 10a, 10b, 11a, 11b: feed rolls

12: measuring wheel 13a, 13b: material support

14a, 14b: support member 15 ', 15: cylinder

Therefore, the apparatus of the present invention is separate from the transfer rolls 10a, 11a, 10b, 11b and the bending positions along the longitudinal direction for moving the side plates through the presses 2. The elastic restoration of the side plates is considered in both the bending machine 5 for bending the side plate 4 during the bending process, and the process of determining the side plate bending process and the bending adjustment based on the measured values. It is a bending device for bending the aluminum side plate (4) in the press (2) consisting of an adjustment and measurement transducer (7) coupled with the press (2) to be installed.

In addition, the adjusting member is provided in the press 2 to adjust the bending process and its correction so that the measurement inspection of the bent plate is followed after all the bending processes, and the bending plate 4 near each bending position for each bending process. Measuring transducer 7 for measuring the shape of the measuring transducer 7 connected to the adjusting member for comparing the actual bending with the desired bending result 7 Adjusting the press 2 to perform any necessary additional bending or re-bending of the bending plate It includes a control member installed to allow for elastic restoration.

The numerical control considering the elastic restoration of the side plate is based on a program such as a Finite Element Method program, and the transfer rolls 10a and 10b near the bending machine 5 to transfer the side plate in the bending process. ), 11a, and 11b. Also, in order to transfer the side plates from one bending position to another bending position, it is equipped with a mechanism for transferring the material by 5 to 30 cm, preferably 10 to 20 cm, and the side plates are transferred from one bending position to another bending position. In order to measure the movement of, a measuring wheel 12 in contact with the side plate is provided. And, in order for the movement to support the side plates freely, the air cushion supports 13a and 13b are provided, and the folding press 2 is provided with the means for flattening excessive bending. In addition, the method of the present invention comprises the steps of transferring the side plate 4 through the press 2 in a method of bending the aluminum side plate 4 in the shape of the desired final side plate in the bending press 2, and In order to form the shape of the final side plate in the bending position spaced from each other along the longitudinal direction of the side plate consists of bending the side plate in each independent bending process, each bending process is the second from the initial initial position Bending the side plate while applying pressure to the third position through the position of, and reducing the pressure applied to the side plate to elastically restore to the second position by the elasticity and obtaining the desired final side plate shape For this purpose, it consists of a process of measuring the deviation of the side plates from the optimum position when in the second position, and a corresponding bending process according to the measured deviation.

In addition, the bending of the side plates is automatically adjusted from the first position to the third position in each bending process, and the bending process is programmed by considering the desired final side plate shape, elastic restoration properties of the side plates and measured deviations. It is adjusted by the adjusting means. In addition, the side plate is transferred to different bending positions through the press (2) is also automatically adjusted, the side plate is supported by the air cushion member which is free to move on both opposite surfaces of the press (2), bending position Is a bending method spaced from each other by 5 to 30 cm, preferably 10 to 20 cm.

The present invention relates to a method of bending a side plate and a bending side plate, the bending of which is carried out in the apparatus or by the bending method according to the present invention.

(Example)

The present invention will be described in detail with reference to the accompanying drawings.

In the figure, 1 denotes a measuring and bending apparatus including a bending press 2, and a capacity of 500 kN or more. The apparatus is provided with a measuring device 3 for adjusting the bending of the central side plate 4 of the spherical tank and a bending machine 5 adapted to the shape of the work material. The side plates have a constant cross section over their length but are asymmetrical about the central horizontal plane, ie horizontal planes equidistant from the upper and lower edges of the side plates.

The bending press 2 is equipped with the fixed body 6 fixed to the fixed base.

The measuring device 3 is provided with two measuring transducers 7 for measuring the working material, preferably on both sides of the bending position. And provide the measured values to a control unit (not shown) incorporating a computer. As shown in Fig. 2, at each measurement position, there are two transducers 7 one near the top edge of the side plate and the other near the bottom edge of the side plate.

The side plate 4 is moved in the direction indicated by arrows 8a and 8b.

The measuring transducer 7 is adjusted in the direction indicated by arrows 9a and 9b.

In order to move the center side plate 4 in the bending press 2, the feed rolls 10a, 11a and 10b, 11b driven by a motor are used one by one.

These rolls 10a, 11a, 10b and 11b are automatically received an adjustment command from a measurement system (not shown) or an adjustment unit of manual adjustment.

And when the feed rolls 10a, 11a, 10b, 11b are placed on both sides of the press 2, a reliable function is obtained and performed.

The rolls 11a and 11b are pressure rolls that press the central side plate 4 against the rolls 10a and 10b.

The apparatus is equipped with a measuring wheel 12 for measuring the longitudinal movement of the central side plate 4.

Both sides of the press 2 are provided with material supporters 13a and 13b for carrying out a supporting operation based on the air cushion.

These support members 13a and 13b include support members 14a and 14b.

The supports 13a and 13b are freely moved on the floor of the workplace so that their weight is transferred along the side plate 4.

The measuring transducer 7 is made to be movable in the vertical direction whenever the side plates 4 are at different heights. By installing a large number of measuring transducers 7 can be configured so that it does not need to be moved vertically.

The press includes a tool 5a indicated by a solid line for bending the work material.

This mechanism 5a includes a female tool used for external bending of a work material and a male tool for internal bending.

This mechanism 5a is mounted to the outer and inner tool carriers 5.

In the initial bending process, one end of the side plate 4 is positioned at the initial bending position in the press 2, and the other end of the side plate 4 is two material supports 13a on one side of the press 2. ) And (13b).

The measuring system comprising the transducer 7 is adapted to inspect and measure the bending and elasticity of the material.

If the bend is to be corrected, the transducer 7 gives the necessary data to continue the bending and flattening operations until successive measurements give correct results.

And the side plate 4 is conveyed from the previous position, in particular to the next bent position which is approximately 10 cm in length.

This working mode is repeated over the entire length of the side plate 4.

During the process operation, the air cushion supports 13a, 13b are sometimes adjusted as necessary and the number thereof must be increased or decreased.

In addition, these supports 13a, 13b should be automatically followed along with the working material.

2 shows two cylinders 15 'and 15 installed for driving an internal tool carrier, which carry a male bending machine 5a.

The cylinder acts on the male bending machine 5a in the vicinity of the lower edge 4 of the side plate 4, where the cylinder 15 is asymmetric, while the side plate 4 of the cylinder 15 'is asymmetric. It is positioned at intervals in the vertical direction so as to act on the male bending machine 5a near the upper edge 4 '. The instrument carrier 5, and therefore the bending machine 5a, can be inclined with respect to the horizontal axis perpendicular to the axes of the cylinders 15 ′ and 15.

With this arrangement, it is possible to apply more pressure to one edge of the side plate than elsewhere in order to prevent the side plate from twisting during the bending process.

By measuring using the transducer 7 during the bending process, the control unit can supply a control signal to the cylinder of the male bending machine in order to prevent or correct the distortion of the side plates or to correct the bending result.

As the two transducers 7 are divided at regular intervals in the vertical direction at each measurement position, the control unit can determine from the measurements provided by the transducers whether the side plates are warped during the bending process.

In the case where the bending machine 5a is operated to prevent twisting, measurements can be used to prove that the side plates are not twisted during the bending process to the extent that the side plates are not allowed.

The device of the present invention has the advantage of first roughly bending the final form closer and then finishing the bending in the second process.

Thus, a relatively particularly excellent bending effect is obtained. By selecting the bending positions close to different front and rear positions, the side plates are bent more accurately.

The press smoothes excessive bending and may include a mechanism 5b, shown in dashed lines.

The male and female bending machines 5b are similar to the male and female bending machines 5a used to bend work materials except that their relative positions are reversed with respect to the bending surface of the work material.

Thus, while bending the work material, the female bending machine 5a is outside the bend and the male bending machine 5a is inside the bend, and in order to straighten the excessive bending, the female bending machine 5b is bent. Inside the portion, the male bending machine 5b is outside the bending portion.

Naturally, the surface shape of each instrument coincides with the side of the side plate joined by the instrument.

The present invention is not limited to the implementation of the apparatus described above, and various modifications can be made within the scope of the appended claims.

No content

Claims (18)

A bending apparatus for bending side plates 4, 4 ', 4 having an asymmetric cross section and having upper and lower edges in the press 2, Feed rolls 10a, 11a, 10b, 11b for moving the side plates through the press 2, A first power positioned to act on the side plate adjacent to its upper edge 4 'to bend the side plates 4, 4', 4 during a separate bending process at a position away from the bending position along its longitudinal direction A bending machine 5 comprising at least a second power cylinder 15 positioned to act on a side plate adjacent the cylinder 15 'and its lower edge 4, Adjustment and measurement transducers (7) combined with presses (2) to determine side bending and bending adjustments based on measured measurements. Aluminum side plate bending device composed of. The aluminum side according to claim 1, wherein the adjusting member is provided in the press 2 to adjust the bending step, the bending step, and the correction thereof so that the measurement inspection of the bent plate is followed after all the bending steps. Plate bending device. The measuring transducer (7) according to claim 2, wherein the measuring transducer (7) measures the shape of the bending plates (4, 4 ', 4) near the bending position for each bending step, A measuring transducer 7 connected to the adjusting member for comparing the desired bending result with the actual bending, Aluminum side plate bending device, characterized in that it comprises a control member installed to adjust the press (2) to perform any necessary additional bending or re-bending to take into account the elastic restoration and distortion of the bending plate. The method according to claim 1, 2 or 3, characterized in that it has first and second transducers 7 for joining the work materials 4, 4 ', 4 at positions spaced in the vertical direction. Aluminum side plate bending device. The aluminum side plate bending apparatus according to any one of claims 1 to 4, wherein the numerical control considering the elastic restoration and the warping of the side plate is based on a program such as a finite element method program. The conveying rolls 10a, 10b, 11a, and 11b in the vicinity of the bending machines 5, 5a, and 5b in order to convey the side plates in the bending process. Aluminum side plate bending apparatus comprising a. 7. A device according to any one of claims 1 to 6, characterized in that it is provided with a mechanism for transferring the material by 5 to 30 cm, preferably 10 to 20 cm, in order to transfer the side plates from one bending position to another bending position. Aluminum side plate bending device. 8. The aluminum side according to claim 1, comprising a measuring wheel 12 in contact with the side plates for measuring the movement of the side plates conveyed from one bending position to another bending position. 9. Plate bending device. The aluminum side plate bending apparatus according to any one of claims 1 to 8, further comprising air cushion supports (13a) and (13b) for supporting the side plates freely in motion. 10. A device according to any one of the preceding claims, wherein the bending press (2) is provided with means (5, 5b) to flatten excessive bending. Bending side plate, characterized in that any one of claims 1 to 10 used to bend the side plate. As a method of bending the side plates 4, 4 ', 4 of an asymmetrical cross section made of aluminum or an aluminum alloy in the shape of the desired final side plate in the bending process 2, The side plates are transferred in a step of transferring the side plates 4 through the presses 2 and independently of each other at the bending positions spaced apart from each other along the longitudinal direction of the side plates in order to form the desired shape of the final side plates. Consists of bending process, Each bending process is bent while applying pressure to the side plate from the initial initial position to the third position through the second position, and the bending pressure is used to correct the tendency of side plate distortion and elastic recovery during bending. To the non-uniform process perpendicular to the side plate, Relieving the pressure applied to the side plate so that the elasticity is restored to the second position by the elasticity; Measuring the deviation of the side plates from the optimum position when in the second position to obtain the desired final side plate shape, and A bending method consisting of a corresponding bending process according to the measured deviation. 13. The bending of the side plate according to claim 12, wherein the step of applying the pressure for bending the side plate, the step of releasing the applied force and the step of measuring the deviation of the side plate are repeated one or more times for each bending step. Bending method, characterized in that the measurement occurs in two or more steps. The bending method according to claim 12 or 13, wherein in each bending step, bending of the side plate is automatically adjusted from the first position to the third position. 15. The method of claim 14, wherein said bending process is adjusted by means of computerized means programmed in consideration of the desired final side plate shape and elastic restoration and warp properties and measured deviations of the side plate. 15. Method according to claim 12, 13 or 14, characterized in that the conveying of the side plates to different bending positions via a press (2) is also automatically adjusted. The bending method according to any one of claims 12 to 15, wherein the side plate is supported by an air cushion member that is free to move on opposite surfaces of the press (2). The bending method according to any one of claims 12 to 17, wherein the bending positions are spaced from each other by 5 to 30 cm, preferably 10 to 20 cm.