Accurate tonnage requirements and recommended model selections, based on a wide range of materials, can be determined by using the Accurpress Tonnage Calculator, which can be accessed online by clicking here.
Mild Steel Bending Tonnages
The chart below illustrates the appropriate tonnages to air bend mild steel with 60,000 p.s.i. tensile properties. It must be noted that most North American steel mills are producing harder metals with typical mechanical properties of 44,000 p.s.i. yield and up to 80,000 p.s.i. tensile strengths. The tonnages required to form these metals are substantially higher and must be taken into
consideration in the selection of a press brake.
With an eight-to-one die ratio, the inside radius of a right angle bend is approximately equal to the thickness of the metal. The bending forces for mild steel are shown on the chart below.
The tonnages indicated in the boxes are produced when using a female die opening eight times the metal thickness up to 3/8" plate, and ten times the metal thickness when bending 1/2" plate and more.
Bending Forces for Other Metals
|Soft brass, soft aluminum
||50% of Force Shown
|Aluminum alloys heat treated
||Same as Mild Steel
||50% more than Steel
Press brake tooling is used in combination with sophisticated machinery and high hydraulic pressure, a situation in which misuse may lead to serious personal injury.
To prevent injury:
- Never use our dies in equipment which lacks the proper safeguards to prevent the user's hands or body parts from entering or remaining in the die space while the equipment is in motion.
- Fully familiarize the die setter with the press brake or machine manual.
- Ensure all points of operation guards are operational and in place, preventing users from exposing any part of their person to the closing on the machine or press brake.
- Supply hand tools for inserting, holding, or removing material, keeping hands at a safe distance.
- Provide users with training in safety practices and procedures. Insist these be followed. Monitor for compliance.
- Ensure dies are being installed and operated per the instruction manual for the brand and make of machine used.
It is our responsibility to produce tooling and dies from quality materials to high standards of manufacturing performance.
It is the useršs responsibility to employ them in proper application with due regard to safety.