Difference between CNC press brake and CNC folding machine
CNC press brake
The CNC press brake upper and down molds respectively fix on the worktables of the bending machine, and the relative movement of the hydraulically driven worktable combine with the shape of the upper and lower molds to realize the bending and forming of the plate.
CNC Folding Machine
The motor drives the upper slide block to compress the sheet, and the hemming beam rotates from bottom to top, thereby driving the sheet to bend into shape.
Comparison of the characteristics in sheet forming
Different forming principles
Press brake : Control the bending angle by controlling the pressure of the upper knife. When the short side is inside, the operator needs to hold up most of the external material. When bending large workpieces, two or more More employee collaboration.
Folding machine: After the plate lay flat on the worktable, the edge holder press down to fix the plate, and the edge holder turn up and down to realize the edge folding. In all the edge folding processes, require no manual intervention Positioning and auxiliary turning and positioning work.
Different bending accuracy
Press brake : The dimensional accuracy of the control is the dimensional accuracy of the short side of the back gauge positioning. After the bending completed, the final error accumulates to the inner hollow size. At the same time, control the bending angle by the lower pressure of the upper die. This angle is related to the thickness of the material
Folding machine: The dimensional accuracy of the control is that after the first hemming complete, the first edge use as the positioning reference, and the final controlled size exactly in the inner dimension require by the customer, and the bending angle directly control by the flanging angle , Has nothing to do with material thickness.
Material surface scratch damage problem
Press brake : When working, the material will produce relative movement in the lower die, leaving indentations without surface protection. When bending a large workpiece, it needs to be turned and moved many times, and scratches will inevitably occur in the process.
Folding machine: When working, the blank holder and the flange cutter do not move relative to the material, thus completely avoiding surface damage. When bending large workpieces , because the plates processed flatly, all processing on one side of the workpiece can be completed at one time positioning, completely avoiding surface damage.
Workers have different technical requirements
Press brake: Relatively higher requirements for the technical level of the bending workers.
Folding machine: Programming can be realized by drawing with fingers intuitively or by the engineer using software to realize offline programming and importing the processing program by USB or network connection. After the programming is completed, the main work of the worker becomes simple loading and unloading Work without skilled bending workers.
Tool configuration
Press brake:Products of different thicknesses and shapes require different upper and lower molds. When realizing some special bending (such as arc) requirements, it is necessary to replace the tool or transfer to another machine tool to achieve this, increasing the transfer and transfer of semi-finished products. Temporary work.
Folding machine: By configuring a rotatable blank holder beam and installing two sets of blank holder tools at the same time, a single station can complete all the bending procedures. For arc bending or other special bending requirements, there is basically no need to replace the tools, just It can be fully realized by making changes in the program.
Tool life
Press brake: Due to the relative movement of the workpiece in the die, the tool will break and needs to maintain or replace.
Folding machine: Basically avoids the relative movement between the material and the tool, the tool is hardly worn for a long time, and the tool life is greatly extended.
Drive System
Press brake : Hydraulically driven, which brings more maintenance work and is susceptible to environmental factors.
Folding machine: Adopts full electric drive design, which reduces maintenance workload and has nothing to do with the use environment, so as to achieve higher bending accuracy.
Disadvantages of folding machine
1) Due to different bending principles, the R angle of the folding machine is larger than that of the bending machine;
2) Due to the limitation of the support table, the workpiece that is turned down on both sides cannot be processed;
3) The size of the workpiece is limited by the compression area of the upper die, and the workpiece smaller than the size of the compression area cannot be processed;
4) The efficiency is not as high as the bending machine;
5)Due to the structural characteristics of the bending machine and the diversity of molds, some complex shapes can be simply realized by the bending machine. Relatively speaking, the flexibility of the folding machine is poor
