Types and characteristics of the plate bending machine Published:2022-11-09

The sheet metal bending machine is the most widely used bending equipment, which uses the simplest general die to bend the sheet metal in a straight line at various angles. The sheet folding machine is simple in operation, low in cost, and easy to replace. The machine itself only moves up and down in a straight line.

The types and specifications of the bending machine are various, the structural forms are various, the functions are increasing, and the accuracy is increasing It has developed into a precision metal forming machine tool. According to the driving mode, there are three types of commonly used bending machines: mechanical plate bending machine, hydraulic plate bending machine and pneumatic bending machine.

1. Mechanical plate bending machine

The structural characteristics and working principle of the mechanical sheet metal folding and quarrying machine are the same as those of the mechanical press. It also uses a crank linkage mechanism to change the rotary motion of the motor into the reciprocating motion of the slider.

Mechanical folding and quarrying machine has large mechanism and high side manufacturing cost. It is often used for bending small and medium-sized pieces.

The advantage of mechanical bending machine is that the parallel precision between the slider and the workbench is far away, and it can withstand eccentric load. However, with the development of powder hydraulic bending machine, these advantages are not obvious.

The blocking points of the mechanical folding machine are:

① The journey and speed cannot be read;

② The pressure can not be controlled, and the equipment can not reach the set pressure in most of the sliding block stroke cycle;

③ It is difficult to operate, and the closing height of the machine should be carefully adjusted before operation;

④ The structural layout of the machine is difficult to achieve numerical control and automatic operation.

Since the slider speed of the mechanical bending machine cannot be adjusted, the high bending speed will bring danger to the operator and easily cause personal accidents. When folding large sheets The sheet metal will produce proud bending, which will affect the shape and accuracy of the parts. With the rapid development of hydraulic technology and hydraulic bending machine The hydraulic bending machine has become the mainstream of the sheet metal bending equipment, and the mechanical bending machine is gradually leaving the bending machinery city A.

2. Hydraulic sheet folding machine

The rolling plate bending machine is hydraulically driven The hydraulic system can exert full pressure on the sheet metal in the whole stroke, and the over cutting can be automatically protected, and it is easy to realize automatic control. The upper die 3 divided into several sections is connected with the sliding block 4 through a hydraulic pad. When bending the sheet metal, the oil in the hydraulic pad can extrude part under the action of Leli, and the upper mold phase can make a small amount of retraction movement to the sliding block; When the sliding block returns, the hydraulic system supplies oil to the hydraulic male to the X position of the upper die relative to the sliding block, so the bending angle of the workpiece does not depend on the lower dead center position of the block. Therefore, it is not necessary to precisely control the stroke of the clearing. At the same time Hydraulic AA can ensure that the workpiece is uniformly pressurized along the full length of the worktable, so that it is not affected by the burning of the slider and the L worktable.

Adjust the upper and lower dishes of the movable V-block 5 of the lower die with a set of cylinder wedge mechanism. When the piston rod of the instrument cylinder moves to the right under the action of compressed air, the lower wedge 3 connected with it also moves to the right and pushes the L chess block 4 and the cushion block 5 to overcome the resistance of the plunger in the two small air siphons 2, so that the movable mother block 5 and the concave chess base plate 6 move to E, that is, the workpiece curvature angle is increased; When the piston rod drives the lower wedge to move to the left, the cold column pushes the cushion block and upper wedge to move downward under the action of the air pressure in the small cylinder The well is close to the lower wedge block, so the movable cushion block descends, that is, the bending angle of the workpiece is reduced. Because of the high rigidity of the pepper block mechanism, once adjusted, the bending angle of the workpiece can be kept unchanged.