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Selection and Characteristics of Stainless Steel Hydraulic Bending Machine

by:WORLD     2022-08-22

Do you know anything about stainless steel hydraulic press brakes? Next, world press machine will introduce you how to choose and buy a suitable stainless steel hydraulic press brake and what are its characteristics?

Teach you how to choose a suitable stainless steel hydraulic press brake?

Artifact:

The important thing to consider is the part you are producing, the point is to buy a machine that can do the job with the shortest table and the smallest tonnage.

Carefully consider material grades as well as machined thicknesses and lengths. If most of the work is mild steel 16 gauge thick and 10 feet long, the free bending force need not be greater than 50 tons. However, if you are doing a lot of bottomed die forming, maybe a 150-ton machine should be considered.

Assuming the thickest material is 1/4 inch, 165 tons for 10 feet of free bending and at least 600 tons for bottomed die bending. If the majority of workpieces are 5 feet or less, the tonnage is almost halved, greatly reducing the acquisition cost. Part length is very important in sizing new machines.

Twist:

You also need to consider the possible deflection of this machine. Under the same load, the deflection of the table and slider of the 10-foot machine is 4 times that of the 5-foot machine. That said, shorter machines require less shim adjustment to produce acceptable parts. Reduced shim adjustment in turn reduces setup time.

Material grade is also a key factor. Compared to mild steel, stainless steel typically requires around 50% more load, while most grades of soft aluminium require around 50% less. You can always get a machine tonnage table from the press brake manufacturer that shows an estimate of the tonnage required per foot of length for different thicknesses and materials.

Bending radius of the part:

When free bending is used, the bending radius is 0.156 times the opening distance of the die. During the free bending process, the opening distance of the die should be 8 times the thickness of the metal material. For example, when forming 16 gauge mild steel using a 1/2 inch gap, the part has a bend radius of about 0.078 inch. If the bending radius is almost as small as the material thickness, a bottomed die forming is required. However, the pressure required for forming a bottomed die is about 4 times greater than that of free bending.

As far as free bending is concerned, punch and die press 85°or less than 85°processing. When using this set of dies, pay attention to the gap between the punch and die at the bottom of the stroke, and enough to compensate for springback to keep the material at 90°Excessive bending left and right. Generally, the springback angle produced by the free bending die on the new press brake is ≤ 2°, the bending radius is equal to 0.156 times the opening distance of the die.

Accuracy:

Bending accuracy requirements are a factor that needs careful consideration, and it is this factor that determines whether you need to consider a CNC press brake or a manual press brake. If bending accuracy is required±1°And it can't be changed, you have to look at the CNC machine.

The repeatability of the CNC press brake slider is±0.0004 inches, forming precise angles must be done with such precision and good molds. The repeatability of the slider of the manual bending machine is±0.002 inches, and will generally produce±2~3°deviation. In addition, CNC press brakes are ready for rapid die set-up, which is an undeniable reason to consider when you need to bend many low-volume parts.

Features of stainless steel hydraulic bending machine:

1. The thermal conductivity of stainless steel is worse than that of ordinary low carbon steel, and the elongation is low, resulting in a large deformation force;

2. Compared with carbon steel, stainless steel sheet has a strong tendency to spring back when bending;

3. Due to the low elongation of the stainless steel plate, the bending angle R of the workpiece should be larger than that of the carbon steel during bending, otherwise there may be cracks;

4. Due to the high hardness of SUS304 stainless steel plate, the cold work hardening effect is significant, so when selecting a bending tool, a tool steel with a heat treatment hardness of 60HRC or more should be selected, and its surface roughness is an order of magnitude higher than that of a carbon steel bending tool.

The above is the relevant introduction. I believe that everyone has a certain understanding of the selection and characteristics of stainless steel hydraulic bending machines.



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