What factors should be considered when selecting a torsion bending machine?

Torsion bending machines and CNC bending machines differ in their processing range and process capabilities. Therefore, manufacturers must carefully consider multiple factors when selecting a torsion bending machine. Careful consideration should be given to the machine's intended application, the potential deflection, the workpiece's bend radius, and other relevant requirements. As the decision-maker, you have an unwavering responsibility to fully understand the machine's performance, processing range, processing capacity, and accuracy. An inappropriate selection can not only increase production costs but also prevent the press brake from achieving its full potential and even hindering return on investment. Therefore, the following aspects should be considered when making a purchasing decision.

1. Workpiece Characteristics

Pay special attention to the specific requirements of the part being processed. The key is to select a machine that can complete the processing task with a shorter worktable and lower tonnage. Careful consideration should be given to the material grade, maximum processing thickness, and length. For example, if the products you process are primarily mild steel with a thickness of less than 3 mm and a maximum length of less than 2500 mm, there is no need to select a machine with a free bending force exceeding 80 tons. If extensive die forming is required, equipment with a tonnage of 150 tons or more should be considered. If primarily bending 6mm thick materials and performing free-bending of mild steel within a 2500mm range, a 100-ton press brake is recommended. If some parts require die bending correction, a larger press brake is required. Furthermore, if the majority of workpieces to be bent are 1250mm or shorter, the required equipment tonnage can be reduced by nearly half, significantly saving procurement costs. Therefore, workpiece length is a key factor in determining the specifications and selection of new equipment.

2. Bending Deformation

During bending operations, especially when processing long workpieces, the longer the workpiece, the more significant the bending deformation. Under the same load, the platen and slide deflection of a 2500mm press brake can be four times that of a 1250mm press brake. This means that shorter press brakes make it easier to adjust shims, making it easier to produce qualified parts and reducing setup time. Currently, CNC press brakes have incorporated hydraulic deflection compensation into their production designs, effectively reducing manual adjustments and improving bending accuracy and production efficiency. This function is controlled by the CNC system. Hydraulic oil enters the compensation cylinder through the magnetic servo valve, pushing the worktable upward. As the bending force increases, the compensation force also increases synchronously, thereby effectively offsetting the deformation of the equipment. In addition, the material of the workpiece is also a factor that cannot be ignored. Compared with mild steel, stainless steel generally requires an increase in processing load of approximately 50%, while the load required for soft aluminum can be reduced by approximately 50%. Press brake manufacturers usually provide standardized bending force parameter tables, which include the bending force required for different thicknesses and materials per 1000 mm length, providing users with a reliable basis for selection.