The difference between folding machine and press brake
A kind of CNC intelligent folding machine commonly used abroad is called the folding machine. This folding machine is not a substitute for the press brake, but a good supplement to the press brake. It can be selectively used in the folding machine Or complete the most suitable bending process on the press brake. In terms of the targeted product material, the folding machine is a machine for plastic products, and the press brake is a machine for metal products. From a functional point of view, the press brake and the folding machine are a kind of machinery that performs a certain bending treatment on the product according to certain requirements. The following describes the difference between the folding machine and the press brake in detail from many aspects.
1. The operation difficulty caused by the principle is different
The press brake controls the bending angle by controlling the downward pressure of the upper knife. At the same time, when bending, the short side is included, and the operator needs to hold up most of the external materials. When bending large workpieces, two or more More staff assistance.
The working principle of the hemming unit is that after the plate is laid flat on the worktable, the holding beam is pressed down to fix the plate, and the hemming beam is turned up and down to realize hemming. No manual labor is required in all hemming processes of one edge Participate in multiple positioning and auxiliary turning and positioning work.
2. The design basis of the expanded drawing is different
The unfolded drawing used by the press brake is set by the K factor, or the corresponding unfolded drawing is obtained by deducting the bending based on the experience value.
The folding machine is automatically generated by Schroder Unfold software. The bending deduction of each side is a sampling based on material characteristics. When the bending length, material thickness, bending angle, flanging height, bending direction change, positioning method, etc. are different, the Unfold software will give the corresponding bending Subtract to get the most accurate unfolding image.
3. The requirements of workers' technical level are different
press brakes have relatively higher requirements on the technical level of bending workers.
The programming of the hemming unit can be realized by intuitively drawing with fingers or the engineer can use software to realize offline programming and use USB or network connection to import the processing program. After the programming is completed, the main work of the worker becomes simple loading and unloading work No need for skilled bending workers.
The press brake can only be operated from the front.
At present, the main structure of the hemming unit includes a single hemming beam structure, a C-shaped hemming beam structure, and an independent servo-driven double hemming beam structure to meet different application requirements. The form of the blank holder is also divided into a reversible blank holder double-blade structure and a single-blade structure, with automatic tool change device and rotary displacement and feed device to realize semi-automatic or fully automatic production.
5. The dimensional accuracy of bending is different
According to the size of the workpiece, the folding machine can be operated both front and rear or even simultaneously, which is convenient for observation and use.
The dimensional accuracy controlled by the hemming unit is that after the first hemming is completed, the first edge is used as the positioning reference, and the final controlled size is exactly the inner space required by the customer. Because the plate is processed flat, it is positioned in both directions (side Positioning and post-positioning) and bending reversing work can be easily completed by one person.
6.The angle accuracy of bending is different
The angle accuracy of the press brake control is indirectly controlled by the amount of pressure on the upper die to control the bending angle, which is related to the thickness of the material, and the hydraulic drive causes the angle to change due to changes in oil temperature.
The hemming unit is fully electrically driven, and the deflection compensation is based on the sampling of the actual materials used and mathematical algorithms based on experience. For different positioning methods, the height of the flanging, the bending length and the bending position, the central electric deflection compensation system combines the flanging The tilt function of the beam and the blank holder finally realizes the stability and accuracy of the intelligent angle control precision.
7.The problem of scratches and damage on the surface of the material
When the press brake is working, the material will produce relative movement in the lower die, and at the same time, it will leave 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.
When the hemming unit is working, no matter the blank holder and hemming beam cutter do not move relative to the material, surface damage can be completely avoided. When large workpieces are bent, because the plates are processed flat and positioned at the same time, all processing on one side of the workpiece can be completed, completely avoiding surface damage.
8. Tool configuration
When the press brake realizes some special bending (such as arc) requirements, it needs to change the tool or transfer to another machine to realize it, increasing the transfer and temporary storage of semi-finished products.
The hemming unit can be designed with a rotatable blank holder, and two sets of blank holder tools can be installed at the same time to realize a single station to complete all bending procedures. For arc bending or other special bending requirements, there is basically no need to replace the tools. It can be fully realized just by modifying the program.
Because of the relative movement of the workpiece in the die of the press brake, the tool will be worn and needs to be maintained or replaced.
The hemming unit basically avoids relative movement between the material and the tool, and the tool life is extended.
10. Drive system
Ordinary press brakes are hydraulically driven, which brings more maintenance work and is susceptible to environmental factors.
The folding machine adopts a fully electric drive design, which reduces maintenance workload and has nothing to do with the use environment. So as to achieve higher bending accuracy. A good equipment is not only the rationality of the mechanical structure design, but also the combination of materials, heat treatment, machining, assembly and other factors, combined with a stable and reliable control system and related software, to achieve long-term accuracy, stability and durability of the equipment.