How to Choose a CNC press brake?

CNC press brake is a machine for bending metal sheets, which is very common in industrial production. With the development and expansion of modern industry, customers’ demand for sheet press brake has gradually increased. However, with the increase in demand, some sheet press brake with uneven quality have gradually appeared in the industry, so how to correctly choose a high-quality sheet press brake? It is best to first carefully consider which model to buy in terms of the end use of the machine, the amount of deflection that the machine is known to experience, the bend radius of the part, etc. Secondly, when choosing a sheet press brake, you also need to know the performance, processing range, processing function, processing accuracy and so on of the machine in detail. For this reason, Senfeng Laser, as a sheet press brake manufacturer, has organized the following contents to help you choose the most suitable sheet press brake:

Workpiece – Specifications and Models

First of all, it is necessary to carry out sufficient calculation according to the standard size and shape structure of the workpiece, so as to purchase a sheet press brake with the shortest worktable and the smallest tonnage that can complete the processing task, so as to achieve practical and economical purposes. For example, if the main product is made of low-carbon steel, its thickness is within 3mm, and the maximum length does not exceed 2500mm, then the free bending force does not need to be greater than 80 tons. But if there is a lot of bottom pressing during the operation, then maybe you should consider buying a sheet press brake of about 150 tons. If the plate to be bent is low carbon steel, the thickest is 6mm and the length is within 2500mm, then it is necessary to consider purchasing a sheet press brake of more than 100 tons. If the bending needs to be corrected when bending, then a larger tonnage press brake is required. Therefore, the length of the workpiece is very important to determine the specifications and models of the bending machine.

Bending Deformation——Compensation Function

The sheet bending machine will deform when bending, especially when bending long workpieces. The longer the workpiece, the greater the degree of deflection. Under the same load, the deflection of the table and slider of the 2500mm model is 4 times that of the 1250mm model. At present, most CNC hydraulic sheet bending machine have added the hydraulic deflection compensation function in the production design, which reduces the adjustment of the equipment by the production operator, and at the same time improves the bending accuracy and production efficiency. The hydraulic deflection compensation function is controlled by the numerical control system. The hydraulic oil enters the compensation cylinder through the magnetic servo valve, and pushes the table upward, and the deflection compensation force increases with the increase of the bending force, thus playing the role of deflection compensation.

Precision – Intelligent CNC

Bending accuracy is a factor that needs to be carefully considered, which determines whether you choose a CNC press brake or an ordinary bending machine. It is acceptable for some workpieces and some simple parts to have errors in a small range, then there is no need to choose a high-precision bending machine. And some workpieces must be high-precision, which requires high precision of the bending machine, so it is more recommended to buy a CNC press brake at this time. For example, if the bending accuracy requires ±0.5° and cannot be changed at will, it is necessary to choose a CNC bending machine. The repeatability of the slider of the CNC bending machine can generally be guaranteed to be ±0.01mm. The repeatability of ordinary bending machines is ±0.5mm, and the deviation of ±2~3° will still occur under the condition of using suitable molds. In addition, CNC bending machines are equipped with quick clamps and quick die change systems, when you need to bend many small parts, CNC press brakes are an unquestionable choice.

Die – Wear Condition

The bending die will also directly affect the accuracy of the bending, so the wear of the die should be checked frequently. The method is to measure the length from the front end of the upper die to the shoulder and the length between the lower die and the shoulder. For conventional molds, the deviation per 10mm should be about ±0.01mm, and the total length deviation should not be greater than ±0.15mm. As for the precision grinding mold, the accuracy should be ±0.005mm per 100mm, and the total accuracy should not be greater than ±0.05mm. It is best to use fine grinding molds for CNC bending machines, and conventional molds for ordinary bending machines.

In short, when purchasing a CNC press brake as a user or manufacturer of the equipment, the most important thing is to purchase an economical and practical CNC press brake. While taking into account many factors, customers should also proceed according to their actual situation. The above points are just a brief overview of some one-sided problems. The best way is to choose a professional CNC press brake manufacturer and let them provide you with advice according to your actual situation, so as to choose the most suitable CNC press brake. If you want to know more about press brakes, Senfeng Laser, as a professional manufacturer of press brakes, will provide you with the most professional advice.

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