1+1>2 - Tandem bending machine

In industries such as ships and aircraft, there is often a requirement for large metal parts to be formed, which requires the use of a tandem bending machine, i.e., two bending machines working in parallel to process large size workpieces. This requires a CNC system to synchronize the control of the two bending machines, currently only expensive electro-hydraulic synchronous bending machine and its CNC system has such a function. If you can use the twist axis bending machine then the cost will drop even more, each set of tandem bending machine linkage bending machine can even save up to RMB200,000.

●Features

1.Generally use 2 sets of the same series of the same specification host, configured with tandem bending machine linkage synchronization device.

2.Select full steel plate welded structure, vibration stress relief, high strength and good rigidity of the machine.

3.The hydraulic system is selected from the United States special hydraulic system, simple and compact, stable and reliable, long life.

4.The synchronization mechanism adopts machine-hydraulic servo and mechanical block, which is connected to the slider with joint bearing, with high synchronization, and can accept certain bias load, avoiding the damage of synchronization organization and the influence on workpiece precision caused by bias load.

5.The slider stroke organization uses motorized adjustment, LED digital display, display accuracy 0.01mm, to ensure the high precision forming point of the board.

6.The backstop distance is motorized adjustment, manual fine adjustment LED digital display, the display accuracy can reach 0.01 mm, eliminating the gap between the gears in the general digital display, the display accuracy is high.

7.Slider stroke adjustment organization is independent motorized organization, changing the previous cylinder internal adjustment type, high positioning accuracy, convenient repair, eliminating the oil leakage and jamming of the cylinder caused by the slider stroke adjustment over limit.

8.The upper die is equipped with deflection compensation organization, optional fast clamping organization. 250 tons or more is equipped with lower die deflection compensation equipment, optional inclined block compensation or cylinder compensation.

9.This machine is now the latest equipment, belongs to the third generation of bending machine, two machines can also be used separately at the same time to improve production efficiency, high positioning accuracy, easy to repair, beautiful and generous.

●Structure design

The left figure is a schematic diagram of the tandem bending machine linkage structure, and the right figure is a schematic diagram of the A-A directional local structure of the left figure; wherein, 1 is the splice joint, 2 is the first bending machine, 3 is the side plate, 4 is the second bending machine, 5, 5′is the table, and 6, 6′is the lower die. Specific implementation as shown in the figure, tandem bending machine linkage bending machine includes a first bending machine 2 and a second bending machine 4, each bending machine is provided with a table, the table is fixed with the lower die, each bending machine is provided with side plates 3 at both ends, the table 5 and lower die 6 on the first bending machine 2 extend outside the side plate 3 on one side and extend to the inside of the side plate of the second bending machine 4, with the second bending machine 4 on the Since the table and the bottom surface of the lower die are finishing surfaces, the gap 1 between the table and the lower die of the first bending machine 2 and the second bending machine 4 is very small, less than 1mm, so that the sheet is bent at the lower die joint of the two bending machines with high precision and no deformed transition area when the tandem bending machine is working in linkage.

The key technology to perform dual machine linkage is to adjust the bending machine speed synchronization of two bending machines to bend a workpiece at the same time in order to achieve the purpose of processing large workpieces. At present, the downward pressure speed of the twist-axis bending machine is not adjustable, so it is impossible to realize the dual machine linkage operation with the twist-axis bending machine. It is due to the structure and function of the twist axis bending machine and its CNC system, the use of two twist axis bending machine for tandem tandem bending machine linkage, technical difficulties, so there is no bending machine manufacturers and users on the market for twist axis bending machine for tandem bending machine linkage operation.

●Technical solutions

The technical problem to be solved by the tandem bending machine linkage bending machine is to provide a control method to realize the linkage of two bending machines. In order to solve the above technical problems, the invention uses the following technical solutions: the tandem bending machine includes two bending machines set side by side, each bending machine includes a frame, a slider, an upper die, a hydraulic drive system and a control system, where the hydraulic drive system is controlled by the control system, the hydraulic drive system drives the slider, and the slider drives the upper die to move up and down. The hydraulic drive system includes an oil tank, an oil chestnut, a solenoid pressure valve, a proportional flow valve and an oil cylinder, the oil outlet of the oil chestnut is connected to the oil inlet of the solenoid pressure valve, the pressure oil outlet of the solenoid pressure valve is connected to the oil inlet of the proportional flow valve, and the oil outlet of the proportional flow valve is connected to the oil cylinder; the tandem bending machine bending machine is also provided with a detection device to measure the position and speed of the upper die under pressure, and the upper die detection device is communicatively connected to the control system to provide feedback to the control system on the position of the upper die under pressure. The upper die detection device is communicatively connected with the control system to provide feedback to the control system on the position and speed of the upper die, and the control system of the two twisted-axis bending machines is synchronously controlled by synchronization signals.

The control system of one of the twisted-axis bending machines is the host, and sends control signals to the control system of the other twisted-axis bending machine, so that the control systems of the two twisted-axis bending machines achieve synchronous control. When the upper die is pressed down, the upper die detection device feeds the control system the position and speed of the upper die pressed down, and the control system then controls the speed of the upper die pressed down, so that the position and speed of the upper die pressed down of the two twisted-axis bending machines remain synchronized.

The electric servo drive system includes a servo motor, a transmission device connecting the servo motor and the slider, and the servo motor drives the up and down movement of the slider through the transmission device. The transmission device includes a gear located on the output shaft of the servo motor and a rack located on the slider, and the gear and the rack engage in transmission. The hydraulic drive system is set up with two cylinders, two cylinders are set up on the left and right sides of the frame piston top rod of the cylinder is connected with the slider. The upper die detection device is a scale device.

When the bending machine starts to work, the proportional flow valve is fully open, and when the upper die reaches the variable speed point, the proportional flow valve starts to act, and the control systems of the two twisted-axis bending machines adjust the upper die downward speed respectively, so that the upper die downward position and speed of the linked two twisted-axis bending machines are kept in synchronization. After the bending machine starts working, the upper die fast down stage before the upper die reaches the variable speed point, the control system issues a command to control the servo motor positive rotation, and the servo motor controls the upper die fast down until the upper die reaches the variable speed point. After the bending is completed, the upper module fast up stage before the upper module reaches the upper dead point, the control system issues a command to control the servo motor reverse, the servo motor through control the upper module fast up until the upper module reaches the upper dead point.

Tandem bending machine linkage system between the two control systems of the two linked bending machines through the synchronization signal to achieve synchronization control, while adding a proportional flow valve in the hydraulic drive system, and through the upper module detection device to measure the upper module downward pressure position and speed of, so that the two twisted axis bending machine can adjust the upper module downward pressure speed, is through the controller can adjust the twisted axis bending machine downward pressure speed. Therefore, the invention can make two bending machine bending machine speed synchronization, while bending a workpiece, to achieve the purpose of processing large workpiece.