As modern industries advance, the prevalence of bending machines in industrial production has become commonplace. However, with increasing demand, the market has witnessed the emergence of bending machines of varying qualities. The quality of these machines plays a crucial role in determining the smoothness or frustration of future production processes. So, how does one properly select a high-quality bending machine? The best approach is to carefully consider the machine’s end-use, potential deflection variables, and the bending radius of the part. Decision-makers must also delve into details regarding the machine’s performance, processing range, accuracy, and other features.
Bending Machine selection guidance
Workpiece – Specification Type
The first crucial consideration is the type of parts intended for production. A comprehensive estimation of the standard size, structural shape, and other factors of the parts should be made. The goal is to purchase a machine that can efficiently complete processing tasks with the shortest table and smallest tonnage, achieving practical and economical purposes.
Material – Bending Force
The material of the processing plate is a key factor influencing the bending force. Stainless steel, for instance, typically requires about 50% more load compared to mild steel, while most materials need approximately 50% less load than soft aluminum. Relevant bending pressure parameters can be obtained from the manufacturer.
Bending Radius – Tonnage Specifications
The bending corner radius of the workpiece is a critical factor during the bending process. For free bending, the bending radius is 0.156 times the size of the V-groove opening. The selection of the lowest tonnage specification is best achieved by planning for a bending radius greater than the plate thickness, using free bending whenever possible.
Accuracy – Intelligent CNC
Bending accuracy is a factor that needs careful consideration, determining whether to invest in a CNC bending machine or a conventional one. CNC bending machines offer high precision, with slider repeatability guaranteed at ± 0.01 mm, making them suitable for applications requiring ± 0.5° accuracy.
Tool – Wear and Tear
Bending dies directly impact bending accuracy. Frequent measurement of wear, by assessing the length from the front of the upper die to the shoulder of the table and the length between the lower die and the shoulder of the table, is necessary. Fine grinding dies are recommended for CNC bending machines, while conventional dies may suffice for ordinary bending machines.
Deflection – Crowning System
This means that shorter machines require less shim adjustment to produce quality parts, and less shim adjustment reduces lead time. However, most current CNC hydraulic bending machines have been designed for production with the addition of a hydraulic deflection compensation function, reducing the need for production operators to adjust the machine while improving bending accuracy and productivity. Hydraulic deflection compensation function is controlled by the CNC system, hydraulic oil through the magnetic service valve into the compensation cylinder, to carry out the table upward, while the deflection compensation force increases with the increase in bending force, thus playing a role in deflection compensation.
Summary
In conclusion, when purchasing a bending machine, users or manufacturers should focus on acquiring an economically practical machine. It is essential to consider multiple factors simultaneously based on the actual situation. The points mentioned above provide a brief overview of some key considerations. However, the best approach is to choose a professional bending machine manufacturer. They can provide several alternative plans tailored to your specific situation, ensuring a more reasonable and effective resolution.
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