How to buy CNC press brake?

  • 2019-09-02 14:36:01

1, The workpiece

The first important thing to consider is the parts you are going to produce. The point is to buy a machine that can perform the machining task with the shortest workbench and the smallest tonnage.

Consider the material grade and maximum processing thickness and length. If most of the work is a low carbon steel with a thickness of 16 gauge and a maximum length of 10 inches, the free bending force does not have to be greater than 50 tons. However, if you are engaged in a large number of bottomed die forming, you should probably consider a 150-ton machine.

Well, assuming that the thickness material is 1/4 inch, a 10 inches free bend requires 165 tons, and a bottomed die bend (corrected bend) requires at least 600 tons. If most of the workpiece is 5 inches or less, the tonnage is almost halved, which greatly reduces the cost of acquisition. The length of the part is important to determine the specifications of the new machine.

CNC press brake

2, Flexing

Under the same load, the 10 inches machine table and sliders are four times more flexed than a 5 inches machine. This means that shorter machines require fewer gasket adjustments to produce qualified parts. Reduced shim adjustment and reduced preparation time. Material grades are also a key factor. Compared to mild steel, the load required for stainless steel is typically increased by about 50%, while most grades of soft aluminum are reduced by about 50%. You can always get the CNC press brake machine's tonnage table from the bender manufacturer, which shows the estimated tonnage per foot length for different thicknesses and materials.

3, The bending radius of the parts

When free bending is used, the bending radius is 0.156 times the opening distance of the die. In the free bending process, the die opening distance should be 8 times the thickness of the metal material. For example, when forming a 16 gauge low carbon steel using a 1/2 inch opening distance, the part has a bend radius of about 0.078 inches. If the bend radius is almost as small as the material thickness, a bottomed die must be formed. However, the pressure required to form the bottom die is about 4 times greater than the free bend.

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