The main application bending types of various bending tool
(1)Straight knife: Generally, it need to bend only one bend without considering avoiding position, see Figure 2
But if the following situations occur, you need to consider avoiding positions, see Figure (3)
It can check from Figure (3) that the ดัด obviously interfering. At this time, another type of bending tool need to consider for bending. The situation on the left side of the picture (3) may choose a small scimitar to avoid the position . See picture (4)
In the situation on the right side of the figure (3)
An acute bending tool of the เครื่องดัด need to use to avoid the position.
But at the same time, it should be noted that because the tip of the sharp knife is very sharp. Its strength is relatively poor, so it cannot be used for bending thick plates.
No sharp knives can use for plate thicknesses above 1.5mm
But in the process arrangement, think of ways, such as arranging the pressure riveting nut process after bending. See picture (5)
There is also such a situation, when the small scimitar cannot avoid the position.
The big scimitar should use to avoid the position . As shown in Figure (6)
But sometimes there will be a big scimitar and cannot avoid the position
Then it needs to increase the bending craft.
Firstly press a stamp on the bending line -as shown in (7), in order to bend better.
You can first bend this bend to a certain angle to avoid touching the bending tool, and then press the side to 90 degrees-as shown in (8)
In general, can apply the embossing process to the bending that cannot complete at one time. So that when performing the second bending , the bending line will print and form better according to the original bending. Otherwise it is easy to cause the second bending and cause the bending deviation. , Or the phenomenon that the bending angle does not well control.
Therefore, such issues need to consider in the design process, and try to avoid using such a process when the requirements are met.
because this does not have a good effect of direct bending, and there may be deviations in size and angle.
The press brake machine can also use to press the dead edge of the workpiece. The workpiece bending with 30 degrees firstly , and then the workpiece crush to death with a flat knife.
Generally, the dead edge that can complete with a normal punch which not arranged in the press brake machine as much as possible, because the punch press The dead side effect is relatively better.
In addition to the interference between the workpiece and the bending tool during the bending process, when the size of the workpiece is relatively large, interference with the press brake machine may also occur during bending.
When we arrange the process, we often have to consider whether it is easy to bend and whether it can be bent. Because bending of press brake machine is a very important process, whether the bending is good or not directly affects the guarantee of bending quality.
The quality problems that occurred at that time all came from the bending size not control well. So should pay special attention to the bending problem during the design process, which relating to the stability of the product quality during mass production.
For different plate thicknesses, its bending size is limited and cannot be too small. Generally, it is related to the lower die.
The general principle is: the lower die selects a slot with 6 times the thickness of the plate, so the bending coefficient Most consistent with experience value. The general classification of slats need to divide according to the outer width of the slats as shown in Figure (9), which are No. 6 and No. 10 respectively.
However, when use press brake machine to bend a small enough slot , it is easy to have indentation. Generally, the indentation below the 6th slot is more obvious. Therefore, when the surface of the workpiece without treatment, when the bending edge is relatively small, there will be obvious indentation. First, it affects the appearance, and second, it is easy to rust, so pay attention to it when designing.
At the same time, in some special needs, the supplier will also manufacture special bending tool, but if the shape of the tool is stranger or the curvature is larger, it will inevitably affect the rigidity of the tool and shorten the tool life.